Variable Radius Compensation (e.g., Constant Interaction Speed) Patents (Class 369/240)
  • Patent number: 11578591
    Abstract: A device and method used to correct beamforming of an acoustic phased array in cases of eccentricity of the acoustic device in a tubular. A processor calculates the eccentricity from multiple scan lines and create a geometric model of a well or pipe relative to the device. The processor may correct each scan line's focus and/or angle of incidence at a surface of the well or pipe based on the observed eccentricity.
    Type: Grant
    Filed: December 9, 2019
    Date of Patent: February 14, 2023
    Inventor: Graham Manders
  • Patent number: 10782155
    Abstract: An angle detection apparatus includes a first integrated circuit and a second integrated circuit. The first integrated circuit generates and outputs an excitation signal to a first resolver for detecting a rotation angle of a first rotating apparatus, generates a first detection sync signal for performing synchronous detection synchronized with the excitation signal for an output signal of the first resolver, and performs the synchronous detection based on the first detection sync signal to output a first angle signal of the first rotating apparatus. The second integrated circuit receives the excitation signal, generates a second detection sync signal for performing the synchronous detection synchronized with the received excitation signal, for an output signal from a second resolver for detecting a rotation angle of a second rotating apparatus, and performs the synchronous detection based on the second detection sync signal to output a second angle signal of the second rotating apparatus.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: September 22, 2020
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Makoto Shinohara
  • Patent number: 7396712
    Abstract: A thin film processing method for processing the thin film by irradiating an optical beam to the thin film. A unit of the irradiation of the optical beam includes a first and a second optical pulse irradiation to the thin film, and the unit of the irradiation is carried out repeatedly to process the thin film. The first and the second optical pulse have pulse waveforms different from each other. Preferably, a unit of the irradiation of the optical beam includes the a first optical pulse irradiated to the thin film and a second optical pulse irradiated to the thin film starting substantially simultaneous with the first optical pulse irradiation. In this case, the relationship between the first and the second optical pulse satisfies (the pulse width of the first optical pulse)<(the optical pulse of the second optical pulse) and (the irradiation intensity of the first optical pulse)?(the irradiation intensity of the second optical pulse).
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: July 8, 2008
    Assignees: NEC Corporation, Sumitomo Heavy Industries, Ltd
    Inventors: Hiroshi Tanabe, Akihiko Taneda
  • Patent number: 6084831
    Abstract: A disc control apparatus handles an even number of disc-shaped recording mediums run in rotation at a constant angular velocity and to which addresses are accorded for incrementing from an inner disc rim side or from an outer disc rim side. The disc control apparatus effectuates data accessing with the disc-shaped recording mediums in terms of a pre-set block as a unit. The control apparatus includes an accessing control unit which effectuates data accessing on the block basis by addressing from the outer disc rim side for one of the disc-shaped recording mediums of the set while effecting data accessing on the block basis by addressing from the inner disc rim side for the other disc-shaped recording medium of the set. During data recording/reproduction, one of two contiguous blocks is recorded/reproduced on the disc-shaped recording medium accessed from the outer disc rim side while the other block is recorded/reproduced on the disc-shaped recording medium accessed from the inner disc rim side.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: July 4, 2000
    Assignee: Sony Corporation
    Inventors: Shigeru Yato, Noboru Asamizuya
  • Patent number: 5298812
    Abstract: A regulating circuit for controlling the speed of a rotating disc to provide a constant frequency signal from the disc includes a signal pickup device which moves radially along the disc and provides a velocity signal the frequency of which changes by a factor .DELTA.f as the position of the pickup device on the disc changes. A processor receives the velocity signal and produces a control signal in accordance with the factor .DELTA.f. A change-over switch provides a fine range voltage and a coarse range voltage which are used to control the speed of the disc in a fine range mode and a coarse range mode, respectively.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: March 29, 1994
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Franz Bigge
  • Patent number: 5214627
    Abstract: An optical disk provided with read-exclusive regions where previously recorded information can be read, and with write-enable regions where information can be written. Information not desired to be rewritten can be recorded on the read-exclusive regions. The write-enable regions are open to users to freely add information thereto and to re-write information recorded. This optical disk can thus be used in various fields.
    Type: Grant
    Filed: February 7, 1990
    Date of Patent: May 25, 1993
    Assignee: Fujitsu Limited
    Inventors: Kazuo Nakashima, Yasunobu Hashimoto, Miyozo Maeda, Seiya Ogawa
  • Patent number: 5182741
    Abstract: An optical disk recording/reproducing device for recording or reproducing information on or from an optical disk while rotatively driving the optical disk at a constant angular velocity. The disk has pre-recorded information cyclically formed along a track so as to provide rotation control at a constant linear velocity. The device, which includes a clock generating circuit for generating a clock signal for recording or reproducing in accordance with a recording frequency of the pre-recorded information derived from signals reproduced by an optical head, is designed to perform recording or reproducing operations with a recording frequency according to the clock signal. The device further includes a magnetic filed control circuit and a recording light power control circuit whereby a magnetic field and light power to be applied to the optical disk is varied according to the recording frequency during recording operations.
    Type: Grant
    Filed: August 16, 1990
    Date of Patent: January 26, 1993
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shigemi Maeda, Toshihisa Deguchi, Shigeo Terashima
  • Patent number: 5157513
    Abstract: A video disc player and the method of its operation are such that in a so-called scan playback mode a track jump is completed at the center of eccentricity of the track on the optical video disc so that various characteristics relating to timebase correction are improved.
    Type: Grant
    Filed: March 13, 1990
    Date of Patent: October 20, 1992
    Assignee: Sony Corporation
    Inventor: Noriyuki Yamashita
  • Patent number: 5063552
    Abstract: A control system is provided for an optical disk driving apparatus adapted to rotate an optical disk having a plurality of tracks, and which is adapted, during the rotation of the disk, to perform optical recording and/or reproduction of information for a track which has been accessed with a light beam. The control system changes the speed f of recording/reproduction of information in accordance with the radius r of a track to be accessed in such a manner that the tracks are divided into a plurality of concentric annular blocks each having different approximate radii, and the same speed f of the recording/reproduction of information is allocated to the tracks in the same block but different speeds f of recording and/or reproduction of information are allocated to the respective blocks.
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: November 5, 1991
    Assignee: Ricoh Company, Ltd.
    Inventor: Toshihiro Shigemori
  • Patent number: 5054014
    Abstract: An apparatus for rotationally driving an optical disk in an optical disk recording and/or reproducing apparatus capable of recording or reproducing signals from disks having different sizes includes a spindle motor for rotationally driving a disk, a servo unit for controlling the rotation of the spindle motor, and a control unit for detecting an activation response state of the spindle motor upon starting, and switching a gain of the servo unit on the basis of the detection result.
    Type: Grant
    Filed: January 19, 1990
    Date of Patent: October 1, 1991
    Assignee: Sony Corporation
    Inventors: Hiroyuki Ito, Hidekazu Hattori, Satoshi Kitani
  • Patent number: 5020047
    Abstract: A method and device are revealed for scanning a radiation-sensitive layer (2) of a rotating carrier (4) with a constant linear velocity by means of a radiation beam (5) which is directed towards the carrier (4) by an optical system (6) which is radially movable relative to the carrier (4). A velocity-pulse generator (10) generates clock pulses (Ps) of a frequency (fs) proportional to the angular velocity of the carrier (4). A clock generator (25) generates clock pulses (Pk) of constant frequency (fk). In response to every clock pulse (Pk) a sum value (Sw) is corrected by a first correction value (DEC). In response to every velocity pulse (Ps) the sum value is corrected by a second correction value (INC) having a sign opposite to that of the first correction value. The angular velocity (W) of the record carrier is controlled to a value for which the average of the sum value (Sw) remains constant.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: May 28, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Rene H. Hamer, Cornelis P. DuPau
  • Patent number: 5010539
    Abstract: A optical disk recording and reproducing device capable of recording and reproducing data to or from an optical disk. Continuous signals representing continuous analog information such as audio and video information and discrete signals representing discrete data-information such as numerical data including program codes or character data are recorded dividedly in different recording regions provided on an optical disk including erasable or write once-type disks. The optical disk is rotated at a given linear or rotary angular speed under control by a disk rotation control device so as to simplify rotational control of the optical disk in accessing the information in the divided regions.
    Type: Grant
    Filed: January 26, 1989
    Date of Patent: April 23, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shigeo Terashima, Kentaro Tsuji, Hiroshi Fuji
  • 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: 4866695
    Abstract: In a control system for a disc player for a CLV (constant linear velocity) type disc, in order to control a rotation of a spindle motor in response to a location of the disc to be read, there is provided a tachometer coupled to the motor for generating a rotation signal having a frequency corresponding to a rotation of the motor, signal generator for generating a reference signal having a frequency corresponding to the rotation suitable to the location to be read, and a drive circuit for controlling the rotation of the motor so that rotation is effected in accordance with the reference signal.
    Type: Grant
    Filed: September 23, 1987
    Date of Patent: September 12, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Motoyuki Suzuki, Yoshio Miura
  • Patent number: 4864553
    Abstract: A rotation control apparatus for controlling a rotation of a recording medium in which a signal modulated in a run length limited code has been recorded in concentric or spiral information tracks at a constant linear velocity. An inversion time detecting circuit alternately detects a maximum or minimum transition interval of a reproduced digital signal from its rise transition to its fall transition, and a maximum or minimum transition interval of the reproduced digital signal from its fall transition to its rise transition, so as to thereby produce a transition interval signal corresponding to each of the detected maximum or minimum values. A motor drive circuit drives a motor in such a direction as to reduce a difference between the value of the transition interval signal and a predetermined value.
    Type: Grant
    Filed: July 13, 1988
    Date of Patent: September 5, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshio Sakakibara, Ryo Akiyama, Shoichi Inatomi, Noriyuki Ema
  • Patent number: 4823203
    Abstract: A circuit in a video disc playback device for detecting a state in which a disc motor rotation speed is double a normal rotation speed comprises a counter for counting a signal occurring at a timing intermediate between windows established for a timing at which a horizontal synchronizing signal is expected to occur and a double speed judgement circuit receiving a count by this counter and produces a double speed detection signal when the count has reached a predetermined value within a certain fixed period. The double speed detection signal is utilized for preventing an erroneous switching between AFC and PLL in the disc motor control such as an erroneous switching from AFC mode to PLL mode with phase locking in a double rotation speed.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: April 18, 1989
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventor: Sadayuki Narusawa
  • Patent number: 4796249
    Abstract: In order to reach precisely a predetermined place on an audio disk during a search run with contactless scanning, the scanning speed is determined from the speed of rotation of the disk. This occurs preferably at the beginning of the first recorded piece. The information concerning the speed of rotation of the disk is determined from the radial error signal. The arrangement is adapted for determining scanning speeds that vary among disks, and where each disk has a scanning speed that is unique to the disk and differs from the scanning speed of another disk.
    Type: Grant
    Filed: November 4, 1986
    Date of Patent: January 3, 1989
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Dieter Baas
  • Patent number: 4757488
    Abstract: A rotation control apparatus for a CLV system disc sets an initial value based on an address signal reproduced from the CLV system disc and carries out a rotation control by use of the initial value, so that it is possible to carry out the rotation control even with respect to a CLV system disc on which an information signal is only recorded up to an intermediate position within a program region of the disc. An information signal is newly recordable in conformance with the CLV system from a position in a vicinity of the intermediate position where the previous recording had been discontinued.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: July 12, 1988
    Assignee: TEAC Corporation
    Inventors: Tadao Nagai, Hirohisa Yamaguchi
  • Patent number: 4757489
    Abstract: A rotation control apparatus controls a rotation frequency of a disc which is to be rotated at a constant linear velocity. The rotation control apparatus comprises a circuit for obtaining a first signal having a first frequency proportional to a rotation frequency of the disc, a circuit for comparing the first signal with a second signal having a second frequency which successively increases, and a control device for obtaining a present rotation frequency of the disc from the second signal which is obtained at a time when the first and second frequencies become equal to each other. The control device supplies to a motor which rotates the disc a driving signal which is obtained from the present rotation frequency in a recording mode, so that the disc rotates at the constant linear velocity.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: July 12, 1988
    Assignee: Victor Company of Japan
    Inventor: Tooru Yamagishi
  • Patent number: 4750055
    Abstract: A video disc is provided with tracks which are arranged in a plurality of sectors. The tracks in the sectors are divided into groups each containing an integral number of video fields recorded on an integral number of tracks. The tracks within a given sector are adapted to be played back at a constant angular velocity, with the angular velocity varying inversely with the radius from sector to sector.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: June 7, 1988
    Assignee: U.S. Philips Corporation
    Inventor: Johannes C. Van Lier
  • Patent number: 4680746
    Abstract: A low-cost recording disc rotary drive control apparatus having a simple circuit configuration employing no voltage divider or frequency-to-voltage converter. A position pulse signal with a period proportional to a position detecting signal produced by a position detecting device is generated, and a rotational pulse signal having a frequency proportional to the rate of rotation of the motor is generated. The supply of a control signal to the motor is effected while supply of an accelerating signal thereto is suspended using a switching device.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: July 14, 1987
    Assignee: Pioneer Electronic Corporation
    Inventor: Hitoshi Senso
  • Patent number: 4675855
    Abstract: A reproducing rate control apparatus for an information recording disc in which pieces of information and absolute times for respective information pieces (representative of the reproduction time measured from the innermost circumference of the information recording disc) are recorded on the disc at a constant linear velocity, a revolution number of the disc at a command position is predicted, rotation of a disc drive motor is controlled so that the disc rotates at a predicted revolution number, and an information reader adapted to read the information recorded on the disc is moved to the command position when the revolution number controlling is effected or after the revolution number controlling has been completed.
    Type: Grant
    Filed: April 3, 1984
    Date of Patent: June 23, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Yoshimi Iso, Harushige Nakagaki, Masafumi Nakamura
  • Patent number: 4611319
    Abstract: A disc drive control system for controlling the drive of a disc carrying a binary digital signal including clock information of a predetermined frequency wherein the digital signal includes an information signal portion to be recorded and an synchronizing signal portion which includes successive maximum periods of inversion (transitions). The system includes a detection means for detecting the period of the transition of the synchronizing signal and producing a detection signal, (frame sync servo signal) disc a control means for producing a disc drive control signal for controlling a disc drive means. The drive control signal is produced in accordance with the detection signal prior to a period in which the drive control signal is produced in accordance with a reproduced clock signal (playback clock and playback frame sync signals), whereby eliminating the problem that the driving speed of the disc may be controlled in accordance with an erroneously reproduced clock signal.
    Type: Grant
    Filed: October 14, 1983
    Date of Patent: September 9, 1986
    Assignee: Pioneer Electronic Corporation
    Inventor: Ryuichi Naito
  • Patent number: 4575835
    Abstract: The invention relates to a motor control circuit of a data reproduction apparatus, which drives a disk motor to reproduce a data signal recorded together with a sync signal on a recording medium so as to control the disk motor in accordance with a reproduced sync signal. The frequency and phase components of the reproduced sync signal are detected, and first and second motor control signals are produced in accordance with frequency and phase detection signals, respectively. A control circuit detects whether or not the frequency detection signal falls within a predetermined range. If it is determined that the frequency detection signal does not fall within the predetermined range, the second motor control signal is kept at a predetermined value.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: March 11, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Meisei Nishikawa, Tadashi Kojima
  • Patent number: 4546461
    Abstract: In order to eliminate a crosstalk component of the reproduction signal and to provide a high level of recording density, a method for recording an information signal having a synchronizing signal on a recording disc comprises a first step for forming a first portion of recording tracks in which information signal is recorded on the recording disc rotated at a constant angular velocity of rotation so that positions of the recording tracks in which the synchronizing signal is recorded are aligned in radial directions of the recording disc, and a second step for forming second portions of recording tracks in which the information signal is recorded on the recording disc under a condition that the angular velocity of the rotation thereof is varying, wherein the first and second portions of the recording tracks are formed alternately.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: October 8, 1985
    Assignee: Pioneer Video Corporation
    Inventor: Teruhiko Isobe
  • Patent number: 4539667
    Abstract: A disc player for reproducing an information signal from a rotating disc having a spiral track on which a digital signal is recorded with a waveform obtained by the run length limited code modulation comprises a control circuit system wherein an interval representing the maximum or minimum run length in a reproduced signal from the disc is utilized for controlling the rotation of a motor for rotating the disc so as to keep the tangential velocity of the spiral track relative to a pickup device constant at predetermined speed and an additional control circuit system for detecting an interval of a constant level in the reproduced signal exceeding in length the interval representing the maximum run length obtained at the proper rotation of the disc, which appears when the reproduced signal from the disc is not properly obtained and therefore the motor is in danger of running away that is, being driven beyond a maximum speed by an ever-increasing energization voltage, and, when such an interval is detected, preve
    Type: Grant
    Filed: November 5, 1982
    Date of Patent: September 3, 1985
    Assignee: Sony Corporation
    Inventor: Kazuhiko Fujiie
  • Patent number: 4539666
    Abstract: Apparatus for reproducing from a record disc a run length limited PCM audio signal comprises an optical transducer which reproduces the PCM audio signal from the record disc; a waveform shaping circuit for producing an output signal corresponding to the reproduced PCM audio signal and having portions of opposite polarities so that the output signal includes a plurality of transition intervals; a clock pulse generator for generating clock pulses having a constant frequency higher than the bit frequency of the output signal; a counter for detecting the period of each transition interval of the output signal by counting the number of clock pulses generated during each detected transition interval of the output signal; a NAND gate for determining, during each of at least one predetermined period selected to be longer than the period ##EQU1## if the number of the clock pulses counted by the counter during each detected transition interval in each longer predetermined period corresponds to a predetermined number of
    Type: Grant
    Filed: October 13, 1982
    Date of Patent: September 3, 1985
    Assignee: Sony Corporation
    Inventor: Shigeaki Wachi
  • Patent number: 4530083
    Abstract: A rotatable memory disk apparatus is provided with a memory disk with a number of tracks driven by a motor and a control circuit for positioning an optical head on an addressed track. The apparatus includes a speed control device for rotating the disk at a rotational speed corresponding to the addressed track. The speed control device includes a conversion circuit for converting a track-addressing signal from the control circuit into an instruction signal for the rotational speed of the disk, a detector for obtaining a rotational speed signal of the disk, and a control device which receives the rotational speed instruction signal and the rotational speed signal to rotate the disk at a predetermined rotational speed for the addressed track.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: July 16, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Atsushi Ishihara
  • Patent number: 4512006
    Abstract: An optical-disk system is disclosed which comprises an optical-disk rotating in accordance with constant linear velocity technique, a signal input device for producing an information signal digitally encoded, and address generator for generating an address signal, an interleave circuit for commonly leaving both the information signal and the address signal, and a write controller for modulating a write beam incident to the optical-disk in response to the output signal from the interleave circuit and for forming at least one sector including both the commonly interleaved signals on the optical-disk.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: April 16, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Teruo Murakami, Isao Hoshino
  • Patent number: 4500982
    Abstract: A servo system for use with apparatus for reproducing a disk on which PCM pulse code modulation signals have been modulated by a run length limited code and which are recorded at a constant linear velocity and the circuit detects the length of a period during which a playback signal is inverted and produces an output corresponding to the detected length and has a peak value hold circuit for maintaining a peak value of the output and a bottom value hold circuit at a later stage of the peak value hold circuit which has a time constant which is larger than the charging time constant of the peak value hold circuit so as to produce an output which follows the output of the peak value hold circuit.
    Type: Grant
    Filed: May 1, 1984
    Date of Patent: February 19, 1985
    Assignee: Sony Corporation
    Inventor: Tadao Yoshida
  • Patent number: 4450552
    Abstract: A velocity control system for a rotating disc having a spiralling track thereon and comprising an arm rotatable about a fixed axis, a stylus attached to such arm and positioned to follow the spiralling track, and logic responsive to the position of the arm to produce a control signal indicative of the position of the arm. Also provided is a prime mover responsive to the control signal to rotate the disc at an angular velocity to produce a velocity at the point of contact between the stylus and the disc which is a predetermined function of the position of the stylus.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: May 22, 1984
    Assignee: RCA Corporation
    Inventor: Angelo R. Marcantonio
  • Patent number: 4439849
    Abstract: An apparatus for controlling the rotational speed of a recording disc to a constant linear velocity. The apparatus has frequency and phase control circuits which detect the variations of the frequency and phase of the digital information signal reproduced from the disc, to detect the rotation speed of the disc. The rotation of the disc is controlled in response to the control signals from the frequency and phase control circuit to a constant linear velocity.
    Type: Grant
    Filed: September 2, 1981
    Date of Patent: March 27, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Daiki Nabeshima
  • Patent number: 4423498
    Abstract: A digital audio disc (DAD) reproducing apparatus comprises pulse width detection and pulse width-to-voltage conversion means for detecting a signal having a predetermined pulse width such as a maximum or minimum pulse width of code modulated digital data signals reproduced by a pickup and converting the detected signal to a voltage proportional to the pulse width, and pulse width error detection means for detecting an error between the converted voltage and a reference voltage corresponding to a reference pulse width. Since the pulse width of the digital data signal changes with a clock rate, the error from the reference voltage represents an error in the clock rate.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: December 27, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Kimura, Shin-ichi Ohashi, Keizo Nishimura
  • Patent number: 4416006
    Abstract: A record disc playing apparatus comprises an address signal generating unit for generating address signals corresponding to horizontal rotational angular positions of a tone arm, a device for generating a rotational angular velocity signal corresponding to the rotational angular velocity of the tone arm, a circuit for controlling the rotation of a motor for driving a turntable, a control device supplied with the address signals and having a memory device from which is from which read out information corresponding to the addresses indicated by the address signals, and an attenuation circuit supplied with the rotational angular velocity signal and operating with an attenuation quantity, with respect to the rotational angular velocity signal, which quantity is varied by a signal from the control device. The rotational angular velocity signal corresponds to the quantity of any eccentricity of the record disc. The control device producing as output signals based on the information thus read out.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: November 15, 1983
    Inventors: Masatsugu Kitamura, Hideo Onoe, Fumiaki Ohno, Tsuyoshi Ono, Yukihiro Kishima, Yutaka Morita
  • Patent number: 4397011
    Abstract: An apparatus for reproducing a disc record on which a PCM signal is recorded in run length limited code includes an input terminal for receiving a reproduced signal from the disc record; a detecting circuit for detecting the maximum or minimum transition interval contained in the reproduced signal and for producing a detecting signal in response thereto, and a comparing circuit for comparing the detecting signal with a reference signal corresponding to the maximum or minimum transition interval during the rotation of the disc record at a predetermined velocity, and for producing a control signal in response to said comparisons to be supplied to a servo circuit for controlling the rotation of the disc record.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: August 2, 1983
    Assignee: Sony Corporation
    Inventor: Hiroshi Ogawa
  • Patent number: 4388713
    Abstract: A rotation control system is used in an apparatus for reproducing information signals from a rotary recording medium by use of a reproducing stylus, wherein the rotary recording medium having the information signals recorded thereon so that the relative velocity between a recording element and the rotary recording medium is maintained constant.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: June 14, 1983
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Kazuo Tatsuguchi
  • Patent number: 4338683
    Abstract: In a disc record reproducing apparatus for reproducing a disc on which a PCM (pulse code modulation) signal in the form of an RLLC (run length limited code) is recorded, a reproduced PCM signal therefrom is frequency-divided at a constant frequency dividing ratio, a frequency-divided PCM signal is compared with a reference frequency signal, and then the rotation of the disc record is controlled by a compared output.
    Type: Grant
    Filed: November 6, 1980
    Date of Patent: July 6, 1982
    Assignee: Sony Corporation
    Inventors: Shunsuke Furukawa, Hiroshi Ogawa, Hitoshi Okada, Masanobu Yamamoto
  • Patent number: 4254487
    Abstract: An electronic timing device having first individual visual display elements numbering sixty positioned to resemble the seconds and/or minutes of a conventional clock, second individual visual display elements numbering twelve positioned for resembling the hour position of a conventional clock, third individual visual display elements numbering seven and representing the seven days of a week and a logic circuit included to provide for sequentially displaying the second, minute and/or date on the first visual display elements, for sequentially displaying the hour and/or the month on the second visual display elements, displaying the day of the week on the third visual display elements for displaying AM or flashing the third indicating visual elements for indicating PM. An (optional) feature provides a selection of time in various selected different time zones.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: March 3, 1981
    Inventor: Shu-Tso Lee