Patents Examined by Bernard Konick
  • Patent number: 4542429
    Abstract: In a magnetic disc memory apparatus in which a magnetic head is in contact with a surface of a magnetic disc when the disc is stationary and caused to float upon rotation of the disc, the magnetic head contacting the magnetic disc is slightly moved in the radial direction of the disc immediately before rotation of the disc, whereby the rotation of the magnetic disc is started after adhesion between the magnetic disc and the magnetic head has been obviated.
    Type: Grant
    Filed: January 19, 1982
    Date of Patent: September 17, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Nishida, Toshiyuki Haruna
  • Patent number: 4525756
    Abstract: In a head shift mechanism in a tape player to shift a head to a reproducing position and hold it there by means of a solenoid driven by a driving signal from a solenoid driving device, an improvement comprising a solenoid driving signal generator, a counter connected to the solenoid driving signal generator for counting up solenoid driving signals from the solenoid driving signal generator, and a head shift stopping device connected to the counter for receiving count completion signal from the counter to actuate to stop action of the head shift solenoid.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: June 25, 1985
    Assignee: Clarion Co., Ltd.
    Inventors: Kazuki Takai, Mitsuhiro Hakumoto, Yasuo Yamada
  • Patent number: 4523133
    Abstract: A tape transport system has reduced unreeled tape length by employing only one tape-deflecting bearing on each side of the read/write head. These bearings are fixed in position, but capable of pneumatically sensing tape tension. This tape tension is sensed at both bearings, and used to counteract the effects of stiction at the head.
    Type: Grant
    Filed: January 13, 1982
    Date of Patent: June 11, 1985
    Assignee: Computer Peripherals Inc.
    Inventor: Carl Messenger
  • Patent number: 4517612
    Abstract: An apparatus for reproducing information from a track of a magnetic record carrier by means of a reproducing head divided into two reproducing portions. The apparatus comprises an amplifier circuit having a pair of input terminals, connected to the outputs of the two reproducing portions, a first signal combination unit, at least one variable gain amplifier and an output terminal. The controllable amplifier is connected between the output of the signal combination unit and the output terminal of the amplifier circuit. The gain of the amplifier is controlled in such a way that upon application of the two signals to the input terminals of the amplifier circuit, a signal is obtained on the output terminal having an amplitude u which is in a fixed ratio to the amplitude of the larger of the two signals applied to the two input terminals.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: May 14, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Albert M. A. Rijckaert, Edmond de Niet
  • Patent number: 4517610
    Abstract: A dual channel read recovery system having a high resolution channel and a low resolution channel and logic for recovering digital information from the high and low resolution signals from the channels, is improved by the inclusion of a variable delay in the low resolution channel. The variable delay is responsive to the high and low resolution signals to more closely match the delays in both channels.
    Type: Grant
    Filed: December 9, 1982
    Date of Patent: May 14, 1985
    Assignee: Magnetic Peripherals Inc.
    Inventor: Vadim B. Minuhin
  • Patent number: 4511936
    Abstract: A switch assembly is provided for a tape drive adapted to receive a tape cartridge. The assembly comprises a housing, first and second switches fixedly mounted on the housing, and first and second plungers mounted for reciprocal movement on the housing to actuate the first and second switches, respectively. The housing includes three orthogonal reference surfaces, all of which engage the tape drive to locate the assembly in proper relationship to the tape drive. The plungers are responsive to the tape cartridge to actuate the first switch when the tape cartridge is properly mounted on the drive and to actuate the second switch when the tape cartridge is not write-protected. The assembly may include a light source and a light-responsive switch which, together with a reflector in the tape cartridge, cooperate to detect position-indicating tape apertures.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: April 16, 1985
    Assignee: Northern Telecom Inc.
    Inventor: Dewey M. Sims, Jr.
  • Patent number: 4510541
    Abstract: A magnetic disk storage unit is proposed for cleaning away dust particles on a disk by a magnetic head 7, which is in contact with the surface of the magnetic disk when a magnetic disk 3 is stationary or rotated at a low speed, and which is floated away from the surface of the magnetic disk, as the revolution rate of the magnetic disk increases.When the magnetic disk starts to rotate or when the disk is rotating at a low speed in a continuous rotation, the magnetic head is reciprocated in the radial direction of the magnetic disk, thereby to peel off the dust particles deposited on the surface of the magnetic disk and the head with the removed dust particles then being collected by a filter.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: April 9, 1985
    Assignee: Hitachi, Ltd.
    Inventor: Asao Sasamoto
  • Patent number: 4506304
    Abstract: A video disc system adapted for use with a recordable, master storage, video disc and a prerecorded, transfer storage, video disc comprises a turntable for rotating the master disc and the transfer disc in synchronism, a playback head for reading the video signals recorded on the transfer disc, electronic circuitry for editing the video signals read by the playback head, and a record head for recording the edited video signals onto the master disc.
    Type: Grant
    Filed: May 3, 1982
    Date of Patent: March 19, 1985
    Assignee: Eastman Kodak Company
    Inventor: Donald M. Harvey
  • Patent number: 4504877
    Abstract: An auto-reverse type cassette tape player having a head base rockably mounted on the front side of a bed and carrying a pair of magnetic heads, so that the magnetic heads are switched in a seesaw-like manner as the tape running direction is switched as a result of a switching between two pinch rollers which cooperate with corresponding capstan shafts.
    Type: Grant
    Filed: February 18, 1982
    Date of Patent: March 12, 1985
    Assignee: Alps Electric Co., Ltd.
    Inventor: Tatsuhiko Tsuchiya
  • Patent number: 4497006
    Abstract: There is disclosed a head assembly for use in a magneto-optic recording/playback system which includes a memory medium having a magnetic coating having a magnetic anisotropy in a vertical direction. A light beam is applied to the memory medium for recording and reproduction of information. The head assembly includes a polarizing prism and a Faraday effect element in an optical path for the light beam. There is needed only the single polarizer.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: January 29, 1985
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Toshihisa Deguchi, Kenji Ohta, Akira Takahashi
  • Patent number: 4492995
    Abstract: A tape cassette loading device comprises a chassis on which a tape cassette is mounted, a pair of guide pins protruding from the chassis and capable of being fitted in guide holes of the tape cassette in a loaded position, a taper surface formed around the guide pin at a given height above the chassis so as to be tapered toward the extended end portion of the guide pin, and an ejection mechanism facing the front portion of the bottom surface of the tape cassette in the loaded position and capable of advancing and retreating along the guide pin. In the final ejected position the cassette rests on the upper tapered portion of the guide or guides.
    Type: Grant
    Filed: April 18, 1984
    Date of Patent: January 8, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Seiji Tomita, Hideo Yokoyama
  • Patent number: 4491287
    Abstract: A cassette tape recording and/or reproducing apparatus has a substantially rectangular chassis with a perimeter approximately coextensive with a tape cassette to be operatively positioned in a cassette holder at one side of the chassis, a tape transport mechanism including reel shafts extending through the chassis for engaging respective reels in a tape cassette operatively positioned against the chassis, and a gear transmission for selectively driving the reel shafts in accordance with a plurality of operating modes, such gear transmission consisting of a plurality of gears disposed at the other side of the chassis for rotation about axes normal to the chassis, with certain of the gears being axially displaceable for the changing from one to another of the operating modes, and push-buttons all disposed at the other side of the chassis and being selectively manually actuable normal to the chassis from extended to depressed positions for displacing respective axially movable gears for correspondingly changing
    Type: Grant
    Filed: December 22, 1981
    Date of Patent: January 1, 1985
    Assignee: Sony Corporation
    Inventor: Mitsuru Ida
  • Patent number: 4489355
    Abstract: A locking device for a magnetic tape cassette in a magnetic tape device has a lever disposed below the insertion slot; a blocking arm projecting out of the housing; a thrust arm; and an ejector arm. When a magnetic tape cassette is locked in with the locking arm, the thrust arm engages via a wedge with a cartridge-like carrier provided with three rotary bodies and by upward movement of the carrier towards the insertion slot presses the rotary bodies into the insertion slot from below and against the magnetic tape cassette. The magnetic tape cassette is thereby securely held at the reference points. When releasing the locking arm, the magnetic tape cassette is ejected by the pre-stressed ejector arm.
    Type: Grant
    Filed: March 30, 1982
    Date of Patent: December 18, 1984
    Assignee: Tandberg Data A/S
    Inventor: Guttorm Rudi
  • Patent number: 4488194
    Abstract: A magnetoresistant transducer is described for reading very high-density a. The magnetoresistant transducer (TMRI) includes at least one magnetoresistor (MRI) of an anisotropic magnetic material placed perpendicular to the direction in which the data of a medium (SM) pass. The axis (AFAI) of easy magnetization of the magnetoresistor is normal to the medium and includes a thin, mono-range or single domain magnetic anisotropic layer (CI) normal to the medium and to the direction in which the data pass. The mono-range or single domain layer is strongly coupled magnetically with the magnetoresistor, and its axis of easy magnetization (AFACI) is normal to the medium and opposite in direction to the axis of easy magnetization of the magnetoresistor. The invention is particularly applicable to the reading of magnetic tapes and disks containing high density data.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: December 11, 1984
    Assignee: Compagnie Internationale pour l'Informatique Cii-Honeywell Bull
    Inventor: Helle Michel
  • Patent number: 4486799
    Abstract: A mounting structure for tape guide elements, for use with a guide drum adapted to have a tape wound in an .OMEGA.-shaped configuration around its periphery, has a base fixed adjacent to the root portion of the drum and has first and second guide supports for the guide elements. At least one of the guide elements is movable relative to the base between an operative position close to the drum in which it guides the tape about the drum and an inoperative position at a further distance from both the other guide element and the periphery of the drum. A pair of spaced apart positioning members engage the periphery of the drum at its root portion for accurately locating the operative positions of the tape guide elements.
    Type: Grant
    Filed: February 10, 1982
    Date of Patent: December 4, 1984
    Assignee: Sony Corporation
    Inventors: Hideo Kawamoto, Seigo Uehara
  • Patent number: 4475281
    Abstract: A transducer-carriage assembly is shown which includes an intermediate adapter that enables the subassembly to be fabricated in a manner that eliminates the effect of tolerances in the component parts, prior to incorporation into the final assembly, with respect to penetration, pitch and roll of the transducer.
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: October 9, 1984
    Assignee: International Business Machines Corporation
    Inventor: Joseph J. Holecek
  • Patent number: 4470089
    Abstract: A cleaning cassette for a tape unit includes a supply reel and a take-up reel, with a cleaning ribbon mounted therebetween. The cleaning ribbon extends around various support surfaces in the cassette, and passes two cleaning stations. The first cleaning station utilizes a spring biased plunger to force the cleaning ribbon against a pinch roller being cleaned. A traction sleeve is positioned between the capstan and the pinch roller to enhance the frictional engagement between the capstan and the pinch roller. At the second cleaning station, the cleaning ribbon passes between the capstan and the pinch roller. Once again, a traction sleeve is provided between the capstan and the pinch roller, and in this case the traction sleeve is offset with respect to the cleaning ribbon. Funnel-shaped openings and distribution channels are provided in the said shell to introduce a liquid such as a cleaning solvent onto the cleaning ribbon near the cleaning stations.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: September 4, 1984
    Assignee: International Jensen Incorporated
    Inventors: Bruce A. Hutchins, Richard Fay
  • Patent number: 4468713
    Abstract: A tape guide mechanism for a tape recorder comprises a pair of first tape guides severally attached to the free end portions of a head lever which has a rotation center in the middle thereof, each of the first tape guides being located on the opposite side of a magnetic head on each side of the head lever to a pinch roller on a pinch roller lever and on the side where its corresponding magnetic head lies. Further, a pair of second tape guides are disposed on the pinch roller lever so as to embrace the pinch roller from both sides thereof, thereby partially covering the pinch roller.
    Type: Grant
    Filed: December 8, 1981
    Date of Patent: August 28, 1984
    Assignee: Olympus Optical Co.
    Inventor: Akira Osanai
  • Patent number: 4466033
    Abstract: A floppy disk drive with automatic disc clamping and ejection is disclosed. The movement of the linear actuator is used to provide both the clamping and ejection, without other drive means. A pair of magnetic heads, positioned on opposing sides of a drive wheel, are fixed to a carriage, one engages the upper surface of the disc, the other the lower surface. Neither head moves relative to the other. The drive components are easily assembled providing a relatively inexpensive, yet reliable drive.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: August 14, 1984
    Assignee: Apple Computer, Inc.
    Inventors: Richard Jordan, William Bull, Robert L. Ciardella, Robert Taggart, Frederick R. Holt
  • Patent number: 4460930
    Abstract: An erroneous erasure preventing piece to be detected is formed simultaneously with disk cassette covers by a molding process. The piece has a configuration which enables it to be slidably remounted to the cassette disk covers after being torn off the cover.
    Type: Grant
    Filed: December 9, 1981
    Date of Patent: July 17, 1984
    Assignee: Sony Corporation
    Inventor: Kiyoshi Takahashi