Track Skippers (i.e., "groove Skippers") Patents (Class 358/907)
  • Patent number: 10016788
    Abstract: Provided are a method, a device and the like for driving a capacitance transducer that enable reduction of transmission sound pressure variation caused by variation in characteristics of a capacitance transducer used for, e.g., an ultrasound conversion element. A method for driving a capacitance transducer including a plurality of elements each including cells each having a structure in which a vibration membrane including one electrode of a pair of electrodes formed with a cavity therebetween is supported in such a manner that the vibration membrane can vibrate is provided.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: July 10, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ayako Kato, Kazutoshi Torashima
  • Patent number: 9568506
    Abstract: The present application discloses electric field measurement device for measuring electric field of a target. Electric field measurement device includes optical waveguide which transmits transmission light, electrode portion, which gives optical characteristics of optical waveguide periodic variation, antenna for setting first state, in which electric field is coupled to optical waveguide, and second state, in which electric field is disconnected from optical waveguide, detector which detects light intensity of emission light emitted from optical waveguide, and applicator which applies voltage to electrode portion to give periodic variation. Applicator includes setting portion, which sets reference voltage in correspondence to light intensity under the second state, and output portion, which outputs voltage in correspondence to difference between reference voltage and induced voltage happening to electrode portion under first state.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: February 14, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Norihito Fujinoki
  • Patent number: 5523860
    Abstract: An image transmission apparatus includes circuitry for separating color image information into a plurality of color signals and transmitting the plurality of color signals. An indication device is provided for, in response to the transmission of the plurality of color signals from the transmitting circuitry, indicating which of the plurality of color signals is transmitted. The indication may include an indication of one of a R G or B signal or an indication of a monochromatic or multi-chromatic transmission.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: June 4, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiro Takei, Tomishige Taguchi, Norio Kimura, Tsuguhide Sakata, Kunio Tsuruno, Yasutomo Suzuki
  • Patent number: 5510906
    Abstract: In a motion picture recording method, a motion picture recording medium, and a motion picture reproducing apparatus, picture data composed of a plurality of motion pictures is recorded to be time-successively reproduced. The picture data, composed of a plurality of motion pictures, is recorded on a disc recording medium on a spiral recording track on which every motion picture is separately recorded, track unit by track unit, in order. Further, respective picture data is recorded to overlap in the radial direction corresponding to at least the time needed for a one-track-jump.
    Type: Grant
    Filed: February 2, 1995
    Date of Patent: April 23, 1996
    Assignee: Sony Corporation
    Inventors: Yoichi Yagasaki, Hideki Koyanagi
  • Patent number: 5233439
    Abstract: In a disk performance apparatus, an audio signal processor is provided so as to remove the higher components with frequency higher than the prescribed frequency of audio signals included in outputs of a reading device for reading recorded signals of a disk during still or slow picture reproducing and the lower components with frequency lower than that corresponding to the period of the track jump, and incompatibility in the auditory sensation of the reproducing sound is eliminated.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: August 3, 1993
    Assignee: Pioneer Electronic Corporation
    Inventor: Yoshihiro Utsumi
  • Patent number: 5218453
    Abstract: A video disc apparatus including a disc rotating device for rotating an optical video disc at a constant linear velocity, a tracking servo device for causing an optical pickup to tack a recording track on the optical video disc, and a translating device for translating the optical pickup along the radius of the optical pickup. It is detected by a detection device if the rotational frequency of the optical video disc by the disc rotating device is within a frequency range in the vicinity of the resonance frequency of the optical pickup. Depending on a detection output of the detection device the operation of an access controlling device is switched so that, in the frequency range in the vicinity of the resonance frequency of the optical pickup, a track jump control is performed for shifting the optical pickup towards the target track position on on the optical video disc with the tracking servo device in the energized state.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: June 8, 1993
    Assignee: Sony Corporation
    Inventor: Minoru Hashimoto
  • Patent number: 5206740
    Abstract: A video disk player generates an error control signal according to the difference between write and read addresses, and causes a read clock to be synchronized in phase with a write clock, on the basis of the error control signal upon reception of an external video signal instead of a video signal produced by playing a video disk, thereby always keeping constant the difference between both addresses.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: April 27, 1993
    Assignee: Pioneer Electronic Corporation
    Inventor: Masao Kanda
  • Patent number: 5177729
    Abstract: A method of and apparatus for reading information, including error correction codes, is disclosed recording information is read out from one track a plurality of times at a reading velocity not lower than at least twice a normal velocity. On the basis of the plural pieces of information read out, the respective quantities of read errors contained in pieces of information are compared with each other so that one of the pieces of read-out information having the minimum quantity of read errors is selected. Accordingly, the selected information to be supplied to the error compensation circuit is the information having the minimum error rate in the sense of probability so that the compensated output further approaches the correct value.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: January 5, 1993
    Assignee: Pioneer Electronic Corporation
    Inventors: Eiji Muramatsu, Takanori Maeda
  • Patent number: 5173784
    Abstract: A video disc player comprises a gray level picture display device for displaying a gray level picture during a track jump and a phase difference detecting circuit for detecting a phase difference between a phase of a horizontal synchronizing signal involved in a reproduced video signal and a horizontal phase for a gray level display during a so-called scan reproduction mode. The horizontal synchronizing signal of the gray picture is corrected so that the above-described phase difference will fall within a tolerance range. Therefore, a satisfactory reproduced video signal without horizontal synchronization disturbance can be obtained.
    Type: Grant
    Filed: April 23, 1990
    Date of Patent: December 22, 1992
    Assignee: Sony Corporation
    Inventors: Tooru Ootsuka, Noriyuki Yamashita
  • Patent number: 5140433
    Abstract: A noise reduction circuit in a recording medium player is disclosed in which the time-axis of a video signal read out from a memory to be used for noise reduction is changed by a shift command signal for changing the time-axis of a video signal in order to keep the continuity of the phase of a color burst in special playback operation. Owing to the arrangement, even in a special playback operation, the phases of a chrominance signal and a luminance signal contained in a read out video signal, and those of a chrominance signal and a luminance signal contained in a video signal as a signal to be mixing-processed coincide with each other, which makes it possible to prevent the blur in a played back picture.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: August 18, 1992
    Assignee: Pioneer Electric Corporation
    Inventor: Kazuo Kuroda
  • Patent number: 5121373
    Abstract: Track jumping in the present system is accomplished by using a two step track jump method which accelerates the tracking actuator toward the desired track at maximum acceleration and then decelerates the tracking actuator at a maximum deceleration so that the desired track is reached in a minimum amount of time without the actuator ringing. A matrix containing the times for each jump pulse from track X to track Y is recorded. The matrix table is updated after each jump to compensate for variance factors. The table is stored in memory which allows the system to become more accurate with each jump. If the actuator falls short of the desired position, the jump pulse next applied is lengthened slightly. If the jump pulse causes the actuator to overshoot, the desired position the jump pulse is shortened for the next jump.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: June 9, 1992
    Assignee: Eastman Kodak Company
    Inventors: Mark A. Barton, Daniel L. Nelson, Gerald J. Smart, Jr.
  • Patent number: 5111305
    Abstract: In a video disk player during the scan reproducing mode, a jump of a calculated number of tracks is carried out so that, even when a video disk is recorded according to the constant linear format, it is possible to reproduce a picture in which vertical synchronization can be prevented from being disturbed or a picture in which even when the disturbance of the vertical synchronization occurs, such disturbed vertical synchronization can be readily eliminated.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: May 5, 1992
    Assignee: Sony Corporation
    Inventor: Noriyuki Yamashita
  • Patent number: 5065383
    Abstract: In a tracking servo system for use in a disc player having a pickup, for playing an information recording disc having a recording track, the peak value of the tracking error signal obtained during a track jump operation is detected, and at least one of the pulse width and the pulse height of the deceleration pulse for the jump operation is varied in response to the detected peak value. With this feature, an appropriate control amount for the track jump operation corresponding to the track pitch is obtained even if there is a change in the track pitch.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: November 12, 1991
    Assignee: Pioneer Electronic Corporation
    Inventors: Kiyoshi Tateishi, Haruyasu Sakata
  • Patent number: 5056074
    Abstract: A tracking servo system for use in a disc player having a pickup, for playing an information recording disc having a recording track, the tracking servo system comprises an equalizing circuit for compensating for the frequency characteristic of the tracking error signal for the tracking servo operation, the equalizing circuit means performing a compensating operation in accordance with a predetermined compensation characteristic during a normal playback of the recording disc.
    Type: Grant
    Filed: April 7, 1989
    Date of Patent: October 8, 1991
    Assignee: Pioneer Electronic Corporation
    Inventors: Kiyoshi Tateishi, Haruyasu Sakata
  • Patent number: 5001570
    Abstract: A multispeed reproducing control apparatus of a video disk player for playing CLV disks causes a portion of the information carrying tracks to be scanned and then a track jump operation is performed, this process being repeated to reproduce the recorded video at a selected n times the standard reproducing rate. To maintain proper image display at the n-times reproducing speed the track jump interval and the number of tracks jump each track jump command are controlled in accordance with the radial position of the pickup head.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: March 19, 1991
    Assignee: Pioneer Electronic Corporation
    Inventor: Akihiko Tagawa
  • Patent number: 4989190
    Abstract: A track-seeking apparatus for an optical disk drive seeks a target track by counting track crossings according to a track-crossing signal. The track-seeking apparatus also has means for detecting the ID fields on the disk and substituting a simulated track-crossing signal for the track-crossing signal in these fields, thus enabling high-speed seeking without track-count errors.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: January 29, 1991
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Shigeru Kuroe, Takayuki Takeda, Masayasu Sato
  • Patent number: 4939712
    Abstract: Address search method for use in a disk player repeatedly performing a track jump operation for jumping over a plurality of recording tracks at one time. The present method changes to a jump state from a locking state in which a tracking servo system of the disk player is locked so that an information reading light spot of a pickup of the disk player follows a recording track. Subsequently, a present address obtained from read output of the pickup is compared with a target address and the tracking servo system is placed in the locking state. The preceding steps for comparing the addresses are repeated until the target address is exceeded by the present address.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: July 3, 1990
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroyuki Abe, Kazuhiro Kiyoura, Kazunori Matsuo, Takayuki Iijima
  • Patent number: 4910722
    Abstract: The optical information recording and reproducing apparatus of the present invention comprises a detecting device detecting that an optical disc-like recording medium, having a spiral track, has made one rotation. A track jump circuit moves the position of a light beam, radiated on one segment of the spiral track of the optical disc-like recording medium, to an objective track segment. A track jump correcting circuit corrects the position of the light beam by the number of tracks which is equal to the number of one-rotation detecting signals obtained from the detecting device during the movement by the track jump circuit. A kick back circuit holds the light beam to always be radiated on the objective track segment.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: March 20, 1990
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Yoshiaki Kaji, Seiji Kitagawa
  • Patent number: 4901298
    Abstract: In an optical disk player including a focus servo system for forming a data detection light spot on a recording disk and a tracking servo system for producing a tracking error signal to control the position of the light spot relative to a recording track, an address search method is provided in which the movement of the light spot is controlled according to a track pulse formed according to the level of the tracking error signal. When it is determined that no track pulse has been produced for a predetermined period of time, the track jumping operation of the light spot is suspended and the abnormal condition of the focus servo system corrected. Track jumping can then be recommenced.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: February 13, 1990
    Assignee: Pioneer Electronic Corporation
    Inventor: Naoki Masaki
  • Patent number: 4887253
    Abstract: A disk player and a method for operating a disk player in which the picture scanning speed for both a constant angular velocity disk and a constant linear velocity disk are made constant and independent of the characteristics of the slider which carries the pickup or of the radial position of the pickup relative the inner radius of the disk. During a jump operation, the number of tracks detected by a track counter is compared with a designated value, and the jump operation is repeated if a scanning command is still present at the end of the previous operation. In the case of a constant angular velocity disk, the designated value is a fixed value, whereas the designated value is calculated in accordance with the present position of the pickup for a constant linear velocity disk.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: December 12, 1989
    Assignee: Pioneer Electronic Corporation
    Inventor: Kiyoshi Tateishi
  • Patent number: 4866687
    Abstract: An optical disk storage access method using a fine and coarse actuators for positioning a light spot to an intended track on the disk, wherein a pulse is generated each time the light spot has traversed a track, the pulses are counted to determine the distance from the current spot position to a target track, the fine actuator is activated depending on the measured distance, and the fine and coarse actuators are operated in unison so that the light spot is positioned to the target track.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: September 12, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Masuo Kasai, Takeshi Maeda, Kazuo Shigematsu, Toshimitsu Kaku, Masahiro Takasago
  • Patent number: 4847697
    Abstract: An apparatus for controlling the reproducing speed for a video disk player in fine speed increments. Every time a vertical synchronizing pulse is delivered the number of tracks to be jumped is determined based on a base speed derived from the integer part of the ratio of an entered speed parameter and half a full scale of a counter. An additional track is jumped when the product of the number of vertical synchronizing pulses and the remainder portion of the above ratio exceeds the full scale of the counter.
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: July 11, 1989
    Assignee: Pioneer Electronic Corporation
    Inventor: Takao Tobe
  • Patent number: 4817073
    Abstract: A tracking servo system for use in an information recording disc player including an equalizing circuit for compensating a frequency characteristic of a tracking error signal generated at a pickup of the disc player. The equalizing characteristic of the equalizing circuit is changed for a predetermined time period after the servo loop is closed during a track jump operation of the disc player. By this feature the servo loop is locked in when a decelerating force is exerted on the actuator of the tracking servo system, thereby to increase the stability of the lock in of the tracking servo system.
    Type: Grant
    Filed: June 4, 1987
    Date of Patent: March 28, 1989
    Assignee: Pioneer Electronic Corporation
    Inventor: Masanori Suzuki
  • Patent number: 4811317
    Abstract: In an information-bearing disk having, along concentric record tracks, pre-written equally spaced tracking pads which may or may not be aligned radially from one track to another, circuitry serves for improving the response time of a disk drive mechanism during a track-jump operation, i.e. when a read/write transducer head moves radially from one record track to any other track. The circuitry includes a phase-locked loop (PLL), coupled to the transducer head and responsive to a pulsed signal corresponding to the frequency at which the tracking pads sweep past the head, and thereby the actual speed of the disk, for producing an adjustable clock signal which controls the rate at which user data is transferred to or from track segments between adjacent tracking pads.
    Type: Grant
    Filed: June 25, 1987
    Date of Patent: March 7, 1989
    Assignee: Eastman Kodak Company
    Inventors: James A. Barnard, Michael G. Fairchild
  • Patent number: 4809094
    Abstract: Disclosed is a method of accessing data recorded in concentric circular or spiral tracks on a recording disc at high speed. A pickup at a position S on the disc is kicked to a position S' on a track on which an objective address data recorded position O exists. Thereafter, the disc is accelerated at a predetermined acceleration torque until the pickup reaches an intermediate position between the positions S' and O, which is determined by a rotational angle from the position S' to O. Then, the disc is decelerated at a predetermined deceleration torque so as to return a speed at which the pickup can read the recorded data before the pickup reaches the position O. With the acceleration and deceleration of the disc, the pickup can quickly become close to the position O and thus can access the data recorded at the position O within an extremely short time.
    Type: Grant
    Filed: June 5, 1987
    Date of Patent: February 28, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd
    Inventor: Ryo Akiyama
  • Patent number: 4807206
    Abstract: A system for recording or reproducing a signal by focusing and irradiating a light beam on a record carrier from a light source while controlling the light beam to always scan the track on the record carrier is disclosed. A track jump that may occur during recording or reproducing a signal on the record carrier is accurately detected. The reliability of the system is thus improved in such a way as to take appropriate action in case of a track jump.
    Type: Grant
    Filed: January 12, 1987
    Date of Patent: February 21, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuro Moriya, Toshiji Kanamaru, Kazuharu Shiragami, Hiroyuki Yamaguchi, Katsuya Watanabe
  • Patent number: 4800546
    Abstract: There is disclosed an optical information record/regenerating apparatus, provided with an optical system for forming a light spot on an optical information recording medium having plural tracks and a track jump area in the tracks, and an optical head movably supporting the optical system so as that the light spot can be moved at least to an adjacent track in the track jump area. Information recording and/or regeneration is achieved by moving both the optical head relative to the recording medium, and by moving the optical system within the optical head. However, the movement of the optical head is prohibited in the track jump area to stabilize the track control operation.
    Type: Grant
    Filed: September 24, 1986
    Date of Patent: January 24, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Shikichi, Akio Aoki, Kazuo Minoura
  • Patent number: 4796247
    Abstract: To provide for continuity of audio output from a compact disc (CD) player, installed in an environment subject to shock or vibration, for example in a motor vehicle, the CD player includes an extra write-read memory (31), placed in the signal processing path of a signal scanned by an optical scanning system to a digital/analog converter in advance of an audio output system (AR), a repositioning system (36) to reposition the optical scanning optical system on a track which may have been lost due to a jolt or vibration, and a synchronizing system to synchronize writing in the write-read memory after repositioning of the optical scanning system at the end of previously written data in said write-read memory immediately in advance of tracking loss.
    Type: Grant
    Filed: May 27, 1987
    Date of Patent: January 3, 1989
    Assignee: Blaupunkt Werke GmbH
    Inventor: Ulrich Vogelsang
  • Patent number: 4777538
    Abstract: Image information recorded on a record medium such as a video disk is scanned in a search scan operation and the image information applied to the video screen is muted during time periods when the readout head of the device jumps between respective programs on the video disk. In addition, an image tracking device, which normally generates an image tracking difference signal, is inhibited during these jumping periods. The existence of a jumping operation is detected by the image tracking device, and the existence of an image difference signal above a predetermined reference level, indicates that the image tracking device has deviated from alignment with a recorded program. The inhibiting of the image difference signal and the muting of the image on the video screen are performed in synchronism with a vertical synchronizing signal of the video image display device.
    Type: Grant
    Filed: December 31, 1985
    Date of Patent: October 11, 1988
    Assignee: Gold Star Co., Ltd.
    Inventor: Kuk Y. Kwak
  • Patent number: 4763205
    Abstract: A method for time axis control for performing both coarse and fine time axis adjustment in accordance with relative speeds of a recording disk and a playback unit while the playback unit is recording or reproducing signals on or from the disk, wherein a color image is displayed during a scanning operation, which displayed image is natural in appearance. The pickup unit is first caused to follow a track formed on the recording medium in a tracking control operation. Repetitive track jumping operations are then effected over successive tracks by moving the pickup unit. For the track jumping operations, a time constant circuit within a circuit which performs the fine time axis adjustment is reset at least for the duration of each track jumping operation.
    Type: Grant
    Filed: August 20, 1985
    Date of Patent: August 9, 1988
    Assignee: Pioneer Electronic Corporation
    Inventor: Takashi Okano
  • Patent number: 4761692
    Abstract: A method and apparatus for playback of a data recording disc which contains a CD area in which a signal such as an audio signal is recorded in digital form and a video area in which a FM-modulated video signal is recorded with a digital audio signal superimposed thereon. The position of a data detection point of a pickup is monitored, and the equalization and amplifier gain of components of a digital demodulation system are automatically changed in accordance with playback being executed of the CD area or the video area, so that a single demodulation system is used for both digital signals from the CD area and digital signals from the video area. In addition, the frequency characteristics of components in servo systems which control the spindle motor, pickup carriage, etc. of the apparatus are automatically changed over for CD area and video area playback respectively, to provide stable servo control in spite of the high speed of rotation during video data playback.
    Type: Grant
    Filed: April 14, 1987
    Date of Patent: August 2, 1988
    Assignee: Pioneer Electronic Corporation
    Inventors: Masayuki Yoshida, Izumi Ueda, Hidehiro Ishii, Takahumi Shiba, Fumihiro Nakajima
  • Patent number: 4759006
    Abstract: A track skipping detection and control arrangement for an optical recording and reproducing disc formed with guide tracks for use in an optical information recording and reproducing apparatus. According to the track skipping detection and control arrangement of the present invention, any sudden track skipping which may take place during recording can be instantaneously detected by the track traversing signal so as to reduce the recording power for the prevention of erroneous recording to neighboring tracks. Moreover, by distinguishing the track traversing signal detected during the jumping operation for repeated continuous reproduction of the particular one track of the optical disc having spiral tracks, from the traversing signal due to the track skipping, erroneous recording may be similarly prevented also with respect to the optical disc having the tracks in the spiral configuration.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: July 19, 1988
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Koishi, Tomio Yoshida, Isao Satoh, Shunji Ohara, Yuzuru Kuroki
  • Patent number: 4739418
    Abstract: An information signal recording disc is recorded with a stereoscopic television signal comprising a stereoscopic video signal and audio signals. The disc comprises a spiral track made up of a plurality of track turns, and video signals related to four fields are recorded on each of the plurality of track turns. Each track turn is time-sequentially recorded with right-eye and left-eye video signals of mutually different field numbers out of the right-eye and left-eye video signals of a simultaneous stereoscopic television signal in a sequence of field numbers together with audio signals, so that the right-eye video signal and the left-eye video signal are respectively recorded for a time period of two fields in each track turn. The right-eye and left-eye video signals related to identical fields are recorded side by side to each other in two mutually adjacent track turns.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: April 19, 1988
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Makoto Iwahara, Kiyoaki Suzuki, Hidetsugu Suzuki, Atsushi Sakamoto
  • Patent number: 4707733
    Abstract: An information recording disc has a connecting region formed between a parallel program recorded region containing a plurality of parallel information programs and a single program recorded region containing a single information program which is to be reproduced after one of the parallel information programs is reproduced.
    Type: Grant
    Filed: March 25, 1985
    Date of Patent: November 17, 1987
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Tatsuya Shinyagaito, Terumasa Kuramoto, Toyotaka Machida, Kikuji Saito, Shunichi Shichijo, Tooru Yamagishi, Kazuyoshi Ishii, Yoshinao Kobayashi, Atsumi Hirata
  • Patent number: 4701897
    Abstract: An optical disk apparatus has an optical head for photoelectrically detecting track data and a track jump data component corresponding to an accidental track jump on an optical disk. A circuit is provided wherein the track jump data component is detected from the data detected by the optical head so as to determine the number of jumped tracks and a jump direction therefrom. A tracking section performs tracking control of the optical head in accordance with a signal corresponding to jump direction and the number of the jumped tracks and returns a laser beam to the track at which the laser beam was directed before the track jump.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: October 20, 1987
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Akira Nakagawa
  • Patent number: 4698795
    Abstract: A tracking servo device for controlling the relative position in the radial direction of a recorded disc between an information reading point of a pick-up and a recorded track having an improved accuracy in performing track-jumping operations. In accordance with the invention, the track jumping operations are performed only in response to a tracking error signal, that is, without the use of a jump drive signal or brake signal, whereby fine control and adjustment of various signals within the circuit are made unnecessary and accurate and quick track jumping operations are ensured. To achieve this, an in-phase and an out-of-phase signal with respect to the tracking error signal are produced and alternately selected through a switch. The levels of the signals applied to the switch may be clamped to prevent them from passing through zero.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: October 6, 1987
    Assignee: Pioneer Electronic Corporation
    Inventor: Junichi Yoshio
  • Patent number: 4698702
    Abstract: Playback apparatus for a rotary recording medium includes a playback head for sensing signals from a plurality of tracks which are formed on a rotary recording medium in such a manner that the front end of recording operation continues to the last end thereof; a head move unit for movably supporting the playback head; an envelope detect device for detecting an envelope of signals sensed by the playback head; and a control unit for controlling the head move unit to move the playback head to a desired one of the plurality of tracks based on the detected envelope. The control unit, in order to control the head move unit to move the playback head in a first direction, is adapted to count the distance moved by the playback head with reference to a predetermined reference position, and to control the head move unit to move the playback head in a second direction opposite to the first direction when an envelope is not detected successively at track positions associated with a predetermined number of tracks.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: October 6, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Izumi Miyake
  • Patent number: 4616353
    Abstract: A tracking servo circuit corrects for closed loop gain variations due to wear of the disc, the width of the electrode of the reproducing stylus, etc. The disc contains an information track bounded by servo tracks used to derive a tracking error signal. This tracking error signal is supplied to an AGC circuit after being filtered and detected. The gain of the AGC circuit decreases as the voltage level of the tracking error signal increases. The tracking error is also supplied to an electric-mechanical conversion system after an oscillatory signal of constant frequency and amplitude is added to it. The oscillator signal is used to stabilize the gain of the servo loop. The electric-mechanical conversion system corrects the position of the stylus in response to these signals.
    Type: Grant
    Filed: April 13, 1984
    Date of Patent: October 7, 1986
    Assignee: Victor Company of Japan Ltd.
    Inventors: Isami Kaneda, Yasushi Sano
  • Patent number: 4615023
    Abstract: A beam access apparatus for an optical disc system. The apparatus includes a lens position detector for generating a lens position signal indicating a position of the objective lens in a radial direction of the disc with respect to the optical head which is movable relative to the disc. The apparatus is operated in a head access mode in which the optical head is moved in the radial direction of the disc and the objective lens is caused to follow the movement of the optical head such that the objective lens is positioned at a predetermined location with respect to the optical head. The apparatus is also operable in a lens access mode wherein the objective lens is moved in the radial direction and the optical head is caused to follow the objective lens such that the objective lens is located at a predetermined position with respect to the optical head.
    Type: Grant
    Filed: August 12, 1985
    Date of Patent: September 30, 1986
    Assignee: NEC Corporation
    Inventors: Hiroshi Inada, Tadashi Nomura, Shigeru Shimonou
  • Patent number: 4613963
    Abstract: A tracking-servo device is provided with a holding mechanism effective to substantially hold a tracking error signal produced just prior to the opening of the tracking-servo loop during a jump-drive operation, so that any restoration force acting on the tracking control actuator during the jump-drive can be cancelled out.
    Type: Grant
    Filed: June 27, 1983
    Date of Patent: September 23, 1986
    Assignee: Pioneer Electronic Corporation
    Inventor: Hiroyuki Hirano
  • Patent number: 4592035
    Abstract: An information signal track search system in a rotary recording medium reproducing apparatus comprising a reproducing transducer having a cantilever provided with a reproducing element and being resiliently supported at a part in the vicinity of a rear end thereof, and a moving circuit for moving the reproducing transducer along a radial direction of the rotary recording medium, comprises, a detecting circuit for detecting that the reproducing element has reached a desired set track position, a movement stopping circuit for stopping the movement of the moving circuit according to an output of the detecting circuit, where the reproducing element lags the rear end of the reproducing transducer while being moved by the moving circuit due to frictional force between the rotary recording medium and receiving a force urging further advancement along the moving direction due to a restoration force of the cantilever after being stopped by the movement stopping circuit, and a forcibly moving circuit for applying a for
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: May 27, 1986
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Yasuo Miyasho
  • Patent number: 4587570
    Abstract: A video disc record system having a stylus for recovering information effects kicks which induce limited stylus translations across a disc record surface. Control circuitry responsive to a desired stylus translation are coupled to kicker means for inducing the stylus translation. Actual stylus translations are used to calibrate the kicker activation signals to minimize the kick used to induce stylus translations thereby reducing damage to the disc surface incurred during a stylus translation.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: May 6, 1986
    Assignee: RCA Corporation
    Inventors: Thomas Y. Chen, Jon K. Clemens, Victor Auerbach
  • Patent number: 4587643
    Abstract: Apparatus permits the use of a known optical compact audio disc for providing a larger memory capacity so that data other than audio data can be reproduced therefrom while maintaining consistency with respect to signal format and signal processing, such as error correcting methods and recording data formats and the like, by providing write clock signals and read-out clock signals for reading into and out two memories the main digital data signal by using a subdigital data signal that is recorded on the disc along with the main digital data and which is reproduced from the disc at the same time as the main data in order to provide addressing of the main digital data on a more accurate level and with finer resolution, and a control system searches a playback location of the main digital data based upon the subdigital data as read out from the buffer memory, in which subdigital data has been written by the write clock signal.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: May 6, 1986
    Assignee: Sony Corporation
    Inventors: Marinus J. B. M. Monen, Shunsuke Furukawa, Tsuneo Furuya
  • Patent number: 4580253
    Abstract: A code signal is intermittently recorded on each recording track of a video disc so as to indicate a groove number. The code signal is picked up by a stylus and is detected by a code signal detector. The detected signal is supplied to a time converter and is converted to detected time data. When the code signal cannot be detected, a detection signal from an arm position detector is used to produce detected time data. Meanwhile, assigned time data is produced by a keyboard and a key input processing circuit. Part of the assigned time data is corrected by a correcting circuit so as to decrease the speed of an arm mechanism before a desired track position. The detected time data and the assigned time data are supplied to a comparator from their upper bits through first and second data selectors, respectively, and are compared. The comparator produces a control signal every time a coincidence is detected.
    Type: Grant
    Filed: April 28, 1983
    Date of Patent: April 1, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Seikou Yoshidome
  • Patent number: 4577300
    Abstract: A disc player for reproducing an information signal from a rotating disc having record tracks defined by successive turns of a spiral signal path in which the information signal is recorded, which is adapted to perform a small scale track jump operation for rapidly moving the reading position determined by a pick-up device in the direction transverse to the spiral signal path on the disc to a relatively short distance repeatedly in the fast forwarding or fast reversing mode and is so arranged that the number of times of the small scale track jump operation performed repeatedly for a certain period in the fast reversing mode is larger than the number of times of the small scale track jump operation performed repeatedly for the same certain period in the fast forwarding mode, whereby the substantial moving distance measured along the spiral signal path in respect of the reading position by the pick-up device moved for the certain period in the fast forwarding mode coincides with or closes to the substantial mov
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: March 18, 1986
    Assignee: Sony Corporation
    Inventors: Akira Katsuyama, Shuichi Kimura
  • Patent number: 4567534
    Abstract: The invention relates to a video-disc player in which by controlling a pivotal mirror rapid jumps over a large number of tracks can be made substantially within the field-blanking interval. In order to minimize the picture disturbance the jump is always started at the instant at which the duration of the remaining period until just before the address code within the next field blanking interval is equal to the anticipated duration of the jump to be performed in particular by measuring the time which has elapsed since the previous read-out of an address code.
    Type: Grant
    Filed: December 7, 1983
    Date of Patent: January 28, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Robertus W. C. Groen, Cornelis A. M. de Jonge, Lawrence M. Schwartz, Johannes C. van Lier
  • Patent number: 4567532
    Abstract: A video recorder and playback system adapted to provide the viewer with selectable views of the action in progress. During recording, a plurality of cameras simultaneously record the action in progress on addressable subtracks of a multi-track loop recording medium such as a laser disk or magnetic surfaced disk. At playback time, the playback and display portion of the system is adapted to read from the same subtract on sequential tracks beginning at a selected starting point. Means are provided for the viewer to change on demand the one of the subtracks being read whereby the view can be instantaneously changed by selecting the one of the subtracks containing the desired view.
    Type: Grant
    Filed: September 16, 1983
    Date of Patent: January 28, 1986
    Assignee: Sanders Associates, Inc.
    Inventors: Ralph H. Baer, David Allen
  • Patent number: 4567533
    Abstract: The invention relates to an apparatus for reading an optical record carrier. During a search mode when an optical read unit is rapidly moved in a radial direction. By means of a control circuit a servo control loop is rendered operative and inoperative by a control circuit in accordance with a predetermined periodic pattern. By means of a deflection element in the optical read unit, the servo control loop controls the scanning position of the read spot on the record carrier. During a fast search operation, the control circuit defines the operative period of the servo control loop in such a way that the address signals recorded in the vertical flyback periods of the video signal are read with a high reliability.
    Type: Grant
    Filed: December 7, 1983
    Date of Patent: January 28, 1986
    Assignee: U.S. Philips Corporation
    Inventor: Gerardus J. Assink
  • Patent number: 4562487
    Abstract: Video disc track numbers are conveyed during each video line by means of a tri-phase modulation of a data carrier recorded along with the picture and sound carriers on a video disc. Upon playback, the data sequence is processed to identify tracking errors occurring within each video field to thereby enable immediate correction of disc tracking errors on a line-by-line basis thus minimizing picture and sound interruptions caused by intra-field tracking errors.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: December 31, 1985
    Assignee: RCA Corporation
    Inventors: Robert N. Hurst, Jr., Michael A. Plotnick
  • Patent number: 4561026
    Abstract: A reproducing apparatus comprises a reproducing circuit including a pickup reproducing element, for reproducing recorded signals from a rotary recording medium, an address signal reproducing circuit for reproducing a track shift address signal from the signals which are reproduced by the reproducing circuit, a detecting circuit for detecting whether the address signal is reproduced with a predetermined period, a memory for storing the value of the reproduced address signal or a flag which is related to the value of the reproduced address signal, when the detecting circuit detects that the address singal is reproduced with the predetermined period, and a circuit for generating a control signal which causes the pickup reproducing element to undergo a forced track shift at predetermined positions on the tracks so that the pickup reproducing element scans along a scanning locus which has the same periodicity as the scanning locus along which the pickup reproducing element had been scanning up to that point.
    Type: Grant
    Filed: January 10, 1984
    Date of Patent: December 24, 1985
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Ryozo Abe, Masaki Sakurai