Patent US4751693A successfully refreshed from Google Patents.
US4751693A
Expired / Lapsed
US
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Memory disk apparatus
Assignee: Toshiba Corp
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Filing: 1986-07-25
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Granted: 1988-06-14
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Expires: 2006-07-25
Abstract
Abstract An optical disk apparatus has an optical head for recording information on or reproducing information from an optical disk. The optical disk has a number of spiral or concentric tracks and a number of sectors formed along the circumferential direction of the disk. The sectors are divided into a plurality of sector blocks along the circumferential direction of the disk. Each sector block includes a different number of sectors which are continuous along the circumferential direction and which have a substantially constant linear length. A memory stores at least the speed data for maintaining a constant relative speed between the optical head and optical disk and is determined for each block group having a predetermined number of blocks. Speed data corresponding to the designated sector block is read out from the memory and is supplied to a velocity control circuit. A motor is driven to maintain a constant linear velocity between the optical head and the tracks of the optical disk.
Inventors
- 👤 Tomohisa Yoshimaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:04
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/24; G11B20/00; G11B20/10; G11B20/12; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
A method for processing data for a disk, comprising: a first step of rotating a memory disk having a predetermined number of continuous blocks provided along a helical groove at a commanded speed, said blocks having respective headers each including a block number; a second step of emitting a light beam to said memory disk to perform one of recording and reproduction; a third step of designating a block to be subjected to at least one of said recording and reproduction; a fourth step of determining a position on said memory disk in accordance with the block number of said designated block; a fifth step of moving said optical head to the position determined by said fourth step; a sixth step of determining a rotating speed of said memory disk in accordance with the block number of said designated block and producing a command indicative of said determined rotating speed; and a seventh step of performing at least one of modulation and demodulation of data on said memory disk with said memory disk being rotated at the rotating speed as determined by said sixth step.
Claim 2
Independent Claim
185 words
A method for processing data for a disk, comprising: a first step of rotating a memory disk having a predetermined number of continuous blocks provided along a helical groove at a commanded speed, said blocks having respective headers each including a block number; a second step of emitting a light beam to said memory disk to perform one of recording and reproduction; a third step of designating a block to be subjected to at least one of said recording and reproduction; a fourth step of determining a position on said memory disk in accordance with the block number of said designated block; a fifth step of moving said optical head to the position determined by said fourth step; a sixth step of determining a rotating speed of said memory disk in accordance with the block number of said designated block and producing a command indicative of said determined rotating speed; and a seventh step of performing at least one of modulation and demodulation of data on said memory disk with said memory disk being rotated at the rotating speed as determined by said sixth step.
Claim 3
Dependent Claim
163 words
A disk apparatus adapted to use a memory disk of the type having a predetermined number of continuous blocks provided along a helical track, said blocks having respective headers each including a block number, said disk apparatus comprising: first means for rotating said memory disk at a commanded speed; second means for reproducing data from said memory disk, said second means having an optical head disposed facing said memory disk; third means for designating a block from which data is to reproduced; fourth means for determining a position on said memory disk and for determining a rotating speed of said memory disk in accordance with a block number of said designated block and commanding said first means to said commanded speed; fifth means for moving said optical head to the position determined by said fourth means; and sixth means for demodulating the data from said second means, with said memory disk being rotated at the rotating speed as determined by said fourth means.
Claim 4
Dependent Claim
163 words
A disk apparatus adapted to use a memory disk of the type having a predetermined number of continuous blocks provided along a helical track, said blocks having respective headers each including a block number, said disk apparatus comprising: first means for rotating said memory disk at a commanded speed; second means for reproducing data from said memory disk, said second means having an optical head disposed facing said memory disk; third means for designating a block from which data is to reproduced; fourth means for determining a position on said memory disk and for determining a rotating speed of said memory disk in accordance with a block number of said designated block and commanding said first means to said commanded speed; fifth means for moving said optical head to the position determined by said fourth means; and sixth means for demodulating the data from said second means, with said memory disk being rotated at the rotating speed as determined by said fourth means.
Claim 5
Dependent Claim
64 words
A disk apparatus as in claim 2 wherein said fourth means includes memory means for storing a table with a correspondence between block numbers, start sector numbers, numbers of sectors per block, and a motor speed data; and processing means coupled to receive said number of said designated block from said third means, for accessing said table using said designated block as an address.
Claim 6
Dependent Claim
57 words
An apparatus as in claim 3 wherein said block number in said table is an initial block number, and said designated block number is used to access said table at a predetermined location when greater than than the block number at said predetermined location and less than a block number at a location adjacent said predetermined location.
Claim 7
Dependent Claim
189 words
A disk apparatus adapted to use a memory disk of the type having a predetermined number of continuous blocks provided along a helical groove of the memory disk, said blocks having respective headers each including a block number comprising: first means for rotating said memory disk at a commanded speed; second means for accessing said memory disk by performing at least one of recording data to and reproduction of data from said memory disk, said second means having an optical head disposed facing said memory disk; third means for designating a block to be accessed by said second means; fourth means for determining a position on said memory disk and for determining a rotating speed of said memory disk, and producing a command indicative of said speed to said first means, based on said block number of said designated block; fifth means for moving said optical head to said position determined by said fourth means; sixth means for performing at least one of modulation and demodulation of the data from said second means with said memory disk being rotated at the rotating speed as determined by said fourth means.
Claim 8
Dependent Claim
189 words
A disk apparatus adapted to use a memory disk of the type having a predetermined number of continuous blocks provided along a helical groove of the memory disk, said blocks having respective headers each including a block number comprising: first means for rotating said memory disk at a commanded speed; second means for accessing said memory disk by performing at least one of recording data to and reproduction of data from said memory disk, said second means having an optical head disposed facing said memory disk; third means for designating a block to be accessed by said second means; fourth means for determining a position on said memory disk and for determining a rotating speed of said memory disk, and producing a command indicative of said speed to said first means, based on said block number of said designated block; fifth means for moving said optical head to said position determined by said fourth means; sixth means for performing at least one of modulation and demodulation of the data from said second means with said memory disk being rotated at the rotating speed as determined by said fourth means.
Claim 9
Dependent Claim
64 words
A disk apparatus as in claim 5 wherein said fourth means includes memory means for storing a table with a correspondence between block numbers, start sector numbers, numbers of sectors per block, and a motor speed data; and processing means coupled to receive said number of said designated block from said third means, for accessing said table using said designated block as an address.
Claim 10
Dependent Claim
57 words
An apparatus as in claim 6 wherein said block number in said table is an initial block number, and said designated block number is used to access said table at a predetermined location when greater than than the block number at said predetermined location and less than a block number at a location adjacent said predetermined location.
Claim 11
Dependent Claim
26 words
Apparatus as in claim 6 wherein said processing means comprises means for calculating a track number from said start sector number and said number of sectors.
Claim 12
Dependent Claim
26 words
Apparatus as in claim 6 wherein said processing means comprises means for calculating a track number from said start sector number and said number of sectors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |