公开(公告)号：JP2003263754A

公开(公告)日：2003-09-19

申请号：JP2003006128

申请日：2003-01-14

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH S ,  DAVIS MARVIN B ,  LEWIS DAVID E ,  GETREUER KURT WALTER ,  SCHELL DAVID LOUIS ,  GRASSENS LEONARDUS J

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12

Abstract: PROBLEM TO BE SOLVED: To provide an improved disk drive system. SOLUTION: The mechanical separator is suitable for reducing the influence of the undesirable mechanical force on the component elements of the disk drive system within the component elements of the disk drive system, for example, a compact disk, a laser disk, a magneto-optical player/recorder and devices analogous therewith. The separator is provided with components for reducing the influence of compressive force, vibration separation and thermal expansion, which components may include the compression ribs disposed at a housing to absorb the compressive force. The housing is preferably suited to adapt itself to the end of a pole piece assembly. A moving carriage may be provided with a buffer bumper and a crash stop as an isolator to prevent the collision of the carriage against the surface of an individual. The compression ribs and the crash stop are formed of materials having minimum creeps, such as silicon rubber, polyurethane, or injection molded plastics. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003263822A

公开(公告)日：2003-09-19

申请号：JP2003008585

申请日：2003-01-16

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH S ,  DAVIS MARVIN B ,  LEWIS DAVID E ,  GETREUER KURT WALTER ,  SCHELL DAVID LOUIS ,  GRASSENS LEONARDUS J

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12

Abstract: PROBLEM TO BE SOLVED: To provide an improved optical disk system. SOLUTION: The optical disc drive apparatus includes mechanics, optics, electronic circuitry, and software code for implementing a method of disc rotation. One such method includes the changing of the rotational rate of a storage medium by applying a force to the storage medium to change the rotational rate from an initial rotational rate toward a first upper limit. The first upper limit is between the initial rotational rate and a desired rotational rate. A first signal is generated when the rotational rate exceeds the first upper limit. A second signal is generated when the rotational rate exceeds a lower acceptable limit of the desired rotational rate. The application of force is then terminated. To terminate the application of force, a second upper limit may be set at an upper acceptable limit of the desired rotational rate, a lower limit may be set at the lower acceptable limit of the desired rotational rate, and the application of force may be terminated when the rotational rate is greater than the lower limit. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003187483A

公开(公告)日：2003-07-04

申请号：JP2003007386

申请日：2003-01-15

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH S ,  DAVIS MARVIN B ,  LEWIS DAVID E ,  GETREUER KURT WALTER ,  SCHELL DAVID LOUIS ,  GRASSENS LEONARDUS J

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12

Abstract: PROBLEM TO BE SOLVED: To provide an improved optical disk system. SOLUTION: A laser driver controls a current supplied to a laser in the optical disk system. The laser driver includes a pass transistor to supply the current to the laser, an operational amplifier to set up a reference voltage on a base of the pass transistor, and a CMOS buffer to apply a drive voltage to an emitter circuit of the pass transistor. The drive voltage has a first voltage level and a second voltage level, and the current is supplied to the emitter circuit only when the drive voltage is at the first voltage level. Furthermore, in the laser driver, the power is consumed only when the laser is energized, and in order to achieve the improvement of a rising and a falling switching characteristics, a switch is provided to switch over the drive voltage between the first voltage level and the second voltage level. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2004005907A

公开(公告)日：2004-01-08

申请号：JP2003006660

申请日：2003-01-15

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH S ,  DAVIS MARVIN B ,  LEWIS DAVID E ,  GETREUER KURT WALTER ,  SCHELL DAVID LOUIS ,  GRASSENS LEONARDUS J

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12

Abstract: PROBLEM TO BE SOLVED: To study a configuration for mitigating undesirable oscillator ringing when writing pulses are supplied in an optical disk device. SOLUTION: An oscillator circuit of a Colpitts type is provided with an adequate resistance load which is an alternative of an inductor and a circuit element which includes an oscillator supply voltage. An improved optical disk system includes an optical assembly, a laser light source, an objective lens, an actuator assembly, a photodetector, a servo motor, a writing pulse source, a first electronic circuit for servo motor control, motors for moving disks, a second electronic circuit for decoding, a third electronic circuit for the laser light source, a voltage supply device for the oscillator, a data receiver, a data encoder, a magnetic field generator, a cartridge loading assembly for attachably and detachably locating the disks, and the oscillator to be used in combination with a servo error circuit for determining when the light returning from the disks exceeds a prescribed value. COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2003248985A

公开(公告)日：2003-09-05

申请号：JP2003007848

申请日：2003-01-16

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH S ,  DAVIS MARVIN B ,  LEWIS DAVID E ,  GETREUER KURT WALTER ,  SCHELL DAVID LOUIS ,  GRASSENS LEONARDUS J

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12

Abstract: PROBLEM TO BE SOLVED: To provide an improved optical disk system. SOLUTION: A magneto-optical drive system includes a computer which monitors a current in a bias coil of a magnetic field generating device to determine the time when a prescribed current threshold value is exceeded. A sufficiently strong magnetic field is generated when the threshold value is exceeded, and writing of information on a storage medium using a laser is enabled. Then, a laser pulse generator is energized. Accordingly, the device realizes the writing cycle that is substantially shortened. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003187444A

公开(公告)日：2003-07-04

申请号：JP2003009159

申请日：2003-01-17

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH S ,  DAVIS MARVIN B ,  LEWIS DAVID E ,  GETREUER KURT WALTER ,  SCHELL DAVID LOUIS ,  GRASSENS LEONARDUS J

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12

Abstract: PROBLEM TO BE SOLVED: To provide an improved optical disk system. SOLUTION: The optical disk system using a CMOS logic is adopted as a part of a power driver assembly, in order to actually switch the current to a system laser. As a result, the power is consumed efficiently, the problem related to heat is eased, and very rapid rise-and-fall number of times is realized. COPYRIGHT: (C)2003,JPO

公开(公告)号：EP0741508A3

公开(公告)日：1998-10-28

申请号：EP96301967

申请日：1996-03-21

Applicant: DISCOVISION ASS

Inventor： DAVIS MARVIN BENJAMIN ,  SCHELL DAVID LOUIS

IPC: G11B7/0045 ,  G11B5/55 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/00 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/02 ,  G11B33/08 ,  G11B33/14 ,  H01S5/022 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12 ,  H05K9/00

CPC classification number: G11B5/5526 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/00745 ,  G11B7/08529 ,  G11B7/08582 ,  G11B7/09 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/0917 ,  G11B7/093 ,  G11B7/0932 ,  G11B7/0933 ,  G11B7/0935 ,  G11B7/0943 ,  G11B7/0945 ,  G11B7/12 ,  G11B7/126 ,  G11B7/1356 ,  G11B11/10563 ,  G11B11/10576 ,  G11B11/10595 ,  G11B17/043 ,  G11B17/0438 ,  G11B19/00 ,  G11B20/10 ,  G11B20/10009 ,  G11B20/1258 ,  G11B20/1833 ,  G11B21/10 ,  G11B21/106 ,  G11B25/043 ,  G11B33/02 ,  G11B33/14 ,  G11B2007/0919 ,  G11B2020/10916 ,  H02K41/0354 ,  H02K41/0356

Abstract: An apparatus for the suppression of electromagnetic emissions from an electronic device. The apparatus includes a die cast metallic container having a continuous wall, a shoulder formed on the continuous wall, a plurality of rounded corners, and a neck portion. The neck portion and shoulder mate with a deep drawn metallic cap. A source of electromagnetic emissions is disposed in the interior space defined by the container and the cap, and a flex strip source passes through a groove formed in an external wall of the container to supply the source. The container is adapted for use in an optical disc system and provides a mount for a semiconductor laser modulated at a radio frequency on the order of 450 MHz. The container also holds auxiliary electronics. A conductive tape seals the assembly so that electromagnetic emissions of the laser are confined within the interior space.

公开(公告)号：AT253250T

公开(公告)日：2003-11-15

申请号：AT97118093

申请日：1996-01-18

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH SCOTT ,  DAVIS MARVIN BENJAMIN ,  GETREUER KURT WALTER ,  GRASSENS LEONARDUS JOHANNES ,  LEWIS DAVID EARL ,  SCHELL DAVID LOUIS

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12 ,  G11B11/10

Abstract: The optical drive system described comprises an optical assembly, a light source, an objective lens disposed in an objective lens subassembly, an actuator assembly which suspends the objective lens subassembly for relative motion thereof with respect to the actuator assembly, first and second servomotors for moving the objective lens subassembly in tracking and focusing directions, respectively, relative to the actuator assembly, a third servomotor for moving the actuator assembly in the tracking direction relative to a medium, first electronic means for controlling the first, second, and third servomotors, a motor with a hub assembly for moving the medium relative to the objective lens subassembly, a photo detector, second electronic means responsive to an output signal of the photo detector for decoding information carried in the light returning from the medium, third electronic means for enabling the light source to emit light at a first intensity level to encode information on the medium and at a second intensity level to read information encoded thereon, data receiving means for accepting data that is storable on the medium, data encoding means being responsive to the data receiving means for representing the data to be stored in a predetemined format, the data encoding means also for directing data to the third electronic means, a magnetic field generator for producing a magnetic field on a portion of the medium and for coacting with the third electronic means and the light source to write and erase information on the medium, a cartridge loading assembly, servo error detecting means coupled to the first electronic means, and a housing structure for positioning components of the optical drive system with respect to one another.The system claimed include means to monitor and use a Quad Sum signal associated with the return light for focus capture.

公开(公告)号：AU716195B2

公开(公告)日：2000-02-24

申请号：AU4205096

申请日：1996-01-18

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH SCOTT ,  DAVIS MARVIN BENJAMIN ,  GETREUER KURT WALTER ,  GRASSENS LEONARDUS J ,  LEWIS DAVID E ,  SCHELL DAVID LOUIS

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12 ,  G11B7/08

Abstract: The optical drive system described comprises an optical assembly, a light source, an objective lens disposed in an objective lens subassembly, an actuator assembly which suspends the objective lens subassembly for relative motion thereof with respect to the actuator assembly, first and second servomotors for moving the objective lens subassembly in tracking and focusing directions, respectively, relative to the actuator assembly, a third servomotor for moving the actuator assembly in the tracking direction relative to a medium, first electronic means for controlling the first, second, and third servomotors, a motor with a hub assembly for moving the medium relative to the objective lens subassembly, a photo detector, second electronic means responsive to an output signal of the photo detector for decoding information carried in the light returning from the medium, third electronic means for enabling the light source to emit light at a first intensity level to encode information on the medium and at a second intensity level to read information encoded thereon, data receiving means for accepting data that is storable on the medium, data encoding means being responsive to the data receiving means for representing the data to be stored in a predetemined format, the data encoding means also for directing data to the third electronic means, a magnetic field generator for producing a magnetic field on a portion of the medium and for coacting with the third electronic means and the light source to write and erase information on the medium, a cartridge loading assembly, servo error detecting means coupled to the first electronic means, and a housing structure for positioning components of the optical drive system with respect to one another.The system claimed include means to monitor and use a Quad Sum signal associated with the return light for focus capture.

公开(公告)号：DE69627232D1

公开(公告)日：2003-05-15

申请号：DE69627232

申请日：1996-01-18

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH SCOTT ,  DAVIS MARVIN BENJAMIN ,  GETREUER KURT WALTER ,  GRASSENS LEONARDUS JOHANNES ,  LEWIS DAVID EARL ,  SCHELL DAVID LOUIS

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12 ,  G11B7/095 ,  G11B11/10

Abstract: The optical drive system described comprises an optical assembly, a light source, an objective lens disposed in an objective lens subassembly, an actuator assembly which suspends the objective lens subassembly for relative motion thereof with respect to the actuator assembly, first and second servomotors for moving the objective lens subassembly in tracking and focusing directions, respectively, relative to the actuator assembly, a third servomotor for moving the actuator assembly in the tracking direction relative to a medium, first electronic means for controlling the first, second, and third servomotors, a motor with a hub assembly for moving the medium relative to the objective lens subassembly, a photo detector, second electronic means responsive to an output signal of the photo detector for decoding information carried in the light returning from the medium, third electronic means for enabling the light source to emit light at a first intensity level to encode information on the medium and at a second intensity level to read information encoded thereon, data receiving means for accepting data that is storable on the medium, data encoding means being responsive to the data receiving means for representing the data to be stored in a predetemined format, the data encoding means also for directing data to the third electronic means, a magnetic field generator for producing a magnetic field on a portion of the medium and for coacting with the third electronic means and the light source to write and erase information on the medium, a cartridge loading assembly, servo error detecting means coupled to the first electronic means, and a housing structure for positioning components of the optical drive system with respect to one another.The system claimed include means to monitor and use a Quad Sum signal associated with the return light for focus capture.