US4918677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording/reproducing apparatus including a plurality of recording or reproducing rates
Assignee: Canon Inc
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Filing: 1986-01-21
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Granted: 1990-04-17
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Expires: 2006-01-21
Abstract
Abstract An apparatus for recording or reproducing information on or from a recording medium such as a disk which rotates at a constant angular velocity. This apparatus comprises: a system to record or reproduce the data on or from the disk; a circuit to designate the recording or reproduction address of the data on the disk; and a control circuit to control the data recording or reproducing rate for the disk. The control circuit makes the recording or reproducing rate constant for a predetermined data and changes the recording or reproducing rate for the other data in accordance with the recording or reproduction address. In this apparatus, by providing track groups in the header portions and data recording portions in the direction of radius of the disk, the clock rate can be easily changed and the recording density is increased and the access time is reduced.
Inventors
- 👤 Takaaki Ashinuma
- 👤 Takehiko Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:31
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/1258; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
173 words
An apparatus for recording/reproducing information comprising: recording/reproducing means for at least one of recording information on and reproducing information from a rotary recording medium rotated at a predetermined constant angular velocity, wherein the recording medium comprises a plurality of information recording tracks each comprising at least one sector, the sector comprising a sector identification area for identifying the sector and a data area; generating means for generating a sync signal for recording information to the recording medium or for reading information from the recording medium; and control means for controlling a frequency of said sync signal in response to the designation of a track address at which information should be recorded or a track address from which information should be reproduced; wherein said control means maintains the frequency of said sync signal for data of the sector identification area constant regardless of the designated track address and forces a frequency of said sync signal for data of the data area to be changed in response to a change in the designated track address.
Claim 2
Independent Claim
173 words
An apparatus for recording/reproducing information comprising: recording/reproducing means for at least one of recording information on and reproducing information from a rotary recording medium rotated at a predetermined constant angular velocity, wherein the recording medium comprises a plurality of information recording tracks each comprising at least one sector, the sector comprising a sector identification area for identifying the sector and a data area; generating means for generating a sync signal for recording information to the recording medium or for reading information from the recording medium; and control means for controlling a frequency of said sync signal in response to the designation of a track address at which information should be recorded or a track address from which information should be reproduced; wherein said control means maintains the frequency of said sync signal for data of the sector identification area constant regardless of the designated track address and forces a frequency of said sync signal for data of the data area to be changed in response to a change in the designated track address.
Claim 3
Dependent Claim
72 words
An apparatus for recording/reproducing information according to claim 1, wherein said control means further controls said frequency of said sync signal for data of the data area such that said frequency of said sync signal for data of the data area is increased in response to advancing of the designated track at which information should be recorded or from which information should be reproduced from an inner track to an outer track.
Claim 4
Dependent Claim
37 words
An apparatus for recording/reproducing information according to claim 2, wherein said control means continuously changes said frequency of said sync signal for data of the data area in response to a change in the designated track address.
Claim 5
Dependent Claim
29 words
An apparatus according to claim 2, wherein said control means further changes said frequency of sync signal for data of the data area for a plurality of adjacent tracks.
Claim 6
Dependent Claim
29 words
An apparatus according to claim 4, wherein said control means keeps constant said frequency of sync signal for data of the data area within a plurality of adjacent tracks.
Claim 7
Dependent Claim
44 words
An apparatus according to claim 2, wherein said control means causes said frequency of said sync signal for data of the sector identification area to coincide with a frequency of said sync signal for data of the most inner track in the data area.
Claim 8
Dependent Claim
23 words
An information recording/reproducing apparatus according to claim 1, wherein information indicating position and type of sector is recorded at said sector identification area.
Claim 9
Dependent Claim
56 words
An apparatus for recording/reproducing information according to claim 1, wherein said control means obtains a distance between a track address and a rotating center of the recording medium on the basis of the track address, and further controls said frequency of said sync signal for data of the data area in response to said obtained distance.
Claim 10
Dependent Claim
30 words
An apparatus according to claim 1, wherein said recording/reproducing means decodes the data of the sector identification area and the data of the data area with a common decoding system.
Claim 11
Dependent Claim
14 words
An apparatus according to claim 1, wherein said recording medium includes an optical disk.
Claim 12
Independent Claim
180 words
An apparatus for recording/reproducing information comprising: recording/reproducing means for at least one of recording information on and reproducing information from a rotary recording medium rotated at a predetermined constant angular velocity, wherein the recording medium comprises a plurality of information recording tracks each comprising at least one sector, the sector comprising a sector identification area for identifying the sector and a data area; generating means for generating a sync signal for recording information to the recording medium or for reading information from the recording medium; and control means for controlling a frequency of said sync signal in response to the designation of a track address at which information should be recorded or a track address from which information should be reproduced; wherein said control means maintains the frequency of said sync signal for data of the sector identification area constant regardless of the designated track address and forces the frequency of said sync signal for data of the data area to be changed for each of said plurality of tracks in response to a change in the designated track address.
Claim 13
Independent Claim
180 words
An apparatus for recording/reproducing information comprising: recording/reproducing means for at least one of recording information on and reproducing information from a rotary recording medium rotated at a predetermined constant angular velocity, wherein the recording medium comprises a plurality of information recording tracks each comprising at least one sector, the sector comprising a sector identification area for identifying the sector and a data area; generating means for generating a sync signal for recording information to the recording medium or for reading information from the recording medium; and control means for controlling a frequency of said sync signal in response to the designation of a track address at which information should be recorded or a track address from which information should be reproduced; wherein said control means maintains the frequency of said sync signal for data of the sector identification area constant regardless of the designated track address and forces the frequency of said sync signal for data of the data area to be changed for each of said plurality of tracks in response to a change in the designated track address.
Claim 14
Dependent Claim
34 words
An apparatus according to claim 11, wherein said control means makes the frequency of said sync signal for data of the data area constant between a first predetermined track and a second predetermined track.
Claim 15
Dependent Claim
18 words
An apparatus according to claim 11, wherein the sector identification area includes information indicative of a track address.
Claim 16
Dependent Claim
69 words
An apparatus according to claim 11, wherein said control means controls said frequency of said sync signal for data of the data area such that said frequency of said sync signal for data of the data area is increased in response to the advancing of the designated track at which information should be recorded or from which information should be reproduced from an inner track to an outer track.
Claim 17
Dependent Claim
30 words
An apparatus according to claim 11, wherein said recording/reproducing means decodes the data of the sector identification area and the data of the data area with a common decoding system.
Claim 18
Dependent Claim
14 words
An apparatus according to claim 11, wherein said recording medium includes an optical disk.
Claim 19
Independent Claim
235 words
An apparatus for recording/reproducing information comprising: recording/reproducing means for at least one of recording information on and reproducing information from a rotary recording medium rotated at a predetermined constant angular velocity, wherein the recording medium comprises a plurality of information recording tracks each comprising at least one sector, the sector comprising a sector identification area for identifying the sector and a data area; generating means for generating a sync signal for recording information to the recording medium or for reading information from the recording medium; and control means for controlling a frequency of said sync signal in response to the designation of a track address at which information should be recorded or a track address from which information should be reproduced; wherein said control means forces said frequency of said sync signal for data of the data area to be changed in response to a change in the designated track address to one of a plurality of types of frequencies and forces said frequency of said sync signal for data of the sector identification area to be changed in response to a change in the designated track address to one of a plurality of types of frequencies, and wherein said plurality of types of frequencies of said sync signal for data of the sector identification area is smaller than said plurality of types of frequencies of said sync signal for data of the data area.
Claim 20
Independent Claim
235 words
An apparatus for recording/reproducing information comprising: recording/reproducing means for at least one of recording information on and reproducing information from a rotary recording medium rotated at a predetermined constant angular velocity, wherein the recording medium comprises a plurality of information recording tracks each comprising at least one sector, the sector comprising a sector identification area for identifying the sector and a data area; generating means for generating a sync signal for recording information to the recording medium or for reading information from the recording medium; and control means for controlling a frequency of said sync signal in response to the designation of a track address at which information should be recorded or a track address from which information should be reproduced; wherein said control means forces said frequency of said sync signal for data of the data area to be changed in response to a change in the designated track address to one of a plurality of types of frequencies and forces said frequency of said sync signal for data of the sector identification area to be changed in response to a change in the designated track address to one of a plurality of types of frequencies, and wherein said plurality of types of frequencies of said sync signal for data of the sector identification area is smaller than said plurality of types of frequencies of said sync signal for data of the data area.
Claim 21
Dependent Claim
74 words
An apparatus for recording/reproducing information according to claim 17, wherein said control means controls said frequency of said sync signal for data of said sector identification area such that said frequency of said sync signal for data of the sector identification area is increased in response to the advancing of the designated track at which information should be recorded or from which information should be reproduced from an inner track to an outer track.
Claim 22
Dependent Claim
32 words
An apparatus for recording/reproducing information according to claim 18, wherein said control means changes said frequency of sync signal for data of the sector identification area for a plurality of adjacent tracks.
Claim 23
Dependent Claim
33 words
An apparatus for recording/reproducing information according to claim 19, wherein said control means maintains constant said frequency of sync signal for data of the sector identification area within a plurality of adjacent tracks.
Claim 24
Dependent Claim
72 words
An apparatus for recording/reproducing information according to claim 17, wherein said control means controls said frequency of said sync signal for data of the data area such that said frequency of said sync signal for data of the data area is increased in response to the advancing of the designated track at which information should be recorded or from which information should be reproduced from an inner track to an outer track.
Claim 25
Dependent Claim
31 words
An apparatus for recording/reproducing information according to claim 21, wherein said control means changes said frequency of sync signal for data of the data area for a plurality of adjacent tracks.
Claim 26
Dependent Claim
32 words
An apparatus for recording/reproducing information according to claim 22, wherein said control means maintains constant said frequency of sync signal for data of the data area within a plurality of adjacent tracks.
Claim 27
Dependent Claim
33 words
An apparatus for recording/reproducing information according to claim 17, wherein said recording/reproducing means decodes the data of the sector identification area and the data of the data area with a common decoding system.
Claim 28
Dependent Claim
14 words
An apparatus according to claim 17, wherein said recording medium includes an optical disk.
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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) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |