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US5274615A
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US
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Method of accessing a card shaped recording medium
Assignee: Olympus Corp
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Filing: 1992-08-07
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Granted: 1993-12-28
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Expires: 2012-08-07
Abstract
Abstract A method of accessing an optical card comprises a first accessing step of making a beam spot projected from an optical head access a target track on the optical card, on those regions of the optical card which are on the outside of ID areas situated on the optical card at its both end portions along an axis of movement of the optical card, a detecting step of detecting whether a tracking error of the beam spot has occurred, following the completion of the first accessing step, and a second accessing step of making, where the tracking error of the beam spot has been detected, the beam spot access the target track on the region on the side opposite to the side where the tracking error has occurred.
Inventors
- 👤 Takao Rokutan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/002; G11B7/0033; G11B27/00; G11B27/10; G11B27/102; G11B7/08; G11B7/085; G11B7/08505; G11B7/08517
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
321 words
A method of accessing a target track on a card-shaped recording medium, said method comprising: an accessing step of moving a beam spot projected from an optical head toward the target track along one of two access regions of the recording medium which are on the outside of ID area situated on end portions along an axis of movement of the recording medium; a scanning step of scanning, with the beam spot, a track corresponding to that portion of the recording medium to which the beam spot is moved in said accessing step; a detecting step of detecting the occurrence of a tracking error of the beam spot; a tracking error avoidance accessing step of further moving the beam spot toward the target track if the occurrence of a tracking error is detected in said detecting step; a tracking error avoidance scanning step of scanning, with the beam spot, a track corresponding to that portion of the recording medium to which the beam spot is moved in said tracking error avoidance accessing step; a tracking error avoidance moving step of further moving the beam spot toward the one of said two access regions on the side of said recording medium opposite to the side on which the occurrence of a tracking error was detected, when the track scanned in said tracking error avoidance scanning step differs from the target track and the beam spot is positioned in the access region on the side of said recording medium on which the occurrence of a tracking error was detected; and a target track accessing step, responsive to one of said tracking error avoidance scanning step and said moving step, of further moving the beam spot to the target track when the beam spot is on the one of said two access regions on the side of said recording medium opposite to the side on which the occurrence of a tracking error was detected.
Claim 2
Independent Claim
321 words
A method of accessing a target track on a card-shaped recording medium, said method comprising: an accessing step of moving a beam spot projected from an optical head toward the target track along one of two access regions of the recording medium which are on the outside of ID area situated on end portions along an axis of movement of the recording medium; a scanning step of scanning, with the beam spot, a track corresponding to that portion of the recording medium to which the beam spot is moved in said accessing step; a detecting step of detecting the occurrence of a tracking error of the beam spot; a tracking error avoidance accessing step of further moving the beam spot toward the target track if the occurrence of a tracking error is detected in said detecting step; a tracking error avoidance scanning step of scanning, with the beam spot, a track corresponding to that portion of the recording medium to which the beam spot is moved in said tracking error avoidance accessing step; a tracking error avoidance moving step of further moving the beam spot toward the one of said two access regions on the side of said recording medium opposite to the side on which the occurrence of a tracking error was detected, when the track scanned in said tracking error avoidance scanning step differs from the target track and the beam spot is positioned in the access region on the side of said recording medium on which the occurrence of a tracking error was detected; and a target track accessing step, responsive to one of said tracking error avoidance scanning step and said moving step, of further moving the beam spot to the target track when the beam spot is on the one of said two access regions on the side of said recording medium opposite to the side on which the occurrence of a tracking error was detected.
Claim 3
Dependent Claim
51 words
A method according to claim 1, wherein said target track accessing step includes a conveying step of conveying the recording medium if the beam spot is in the one of said two access regions on the side of the recording medium on which the occurrence of a tracking error was detected.
Claim 4
Dependent Claim
33 words
A method according to claim 2, wherein said target track accessing step includes a fine seek step of jumping the beam spot track by track until the beam spot reaches the target track.
Claim 5
Dependent Claim
38 words
A method according to claim 3, wherein said target track accessing step includes a coarse seek step of jumping the beam spot in units of a predetermined number of tracks until the beam spot reaches the target track.
Claim 6
Dependent Claim
33 words
A method according to claim 2, wherein said tracking error avoidance accessing step includes a fine seek step of jumping the beam spot track by track until the beam reaches the target track.
Claim 7
Dependent Claim
39 words
A method according to claim 6, wherein said tracking error avoidance accessing step includes a coarse seek step of jumping the beam spot in units of a predetermined number of tracks until the beam spot reaches the target track.
Claim 8
Independent Claim
259 words
A method of accessing a target track on a card-shaped recording medium, said method comprising: an accessing step of moving a beam spot projected from an optical head toward the target track along one of two access regions of the recording medium which are on the outside of ID areas situated on end portions along an axis of movement of the recording medium; a scanning step of scanning, with the beam spot, a track corresponding to that portion of the recording medium to which the beam spot is moved in said accessing step; a detecting step of detecting the occurrence of a tracking error of the beam spot; a position-detecting step of detecting the position of the beam spot if the occurrence of a tracking error of the beam spot is detected in the detecting step; a moving step of moving the beam spot to the one of said two access regions on the side of the recording medium opposite to the side where the occurrence of a tracking error was detected, if in the position-detecting step the beam spot is detected as being located in the other of said two access regions on the side where the occurrence of a tracking error was detected; and a target track accessing step, responsive to one of said position-detecting step and said moving step, of moving the beam spot to the target track along the one of said two access regions on the side of the recording medium opposite to the side where the occurrence of a tracking error was detected.
Claim 9
Independent Claim
259 words
A method of accessing a target track on a card-shaped recording medium, said method comprising: an accessing step of moving a beam spot projected from an optical head toward the target track along one of two access regions of the recording medium which are on the outside of ID areas situated on end portions along an axis of movement of the recording medium; a scanning step of scanning, with the beam spot, a track corresponding to that portion of the recording medium to which the beam spot is moved in said accessing step; a detecting step of detecting the occurrence of a tracking error of the beam spot; a position-detecting step of detecting the position of the beam spot if the occurrence of a tracking error of the beam spot is detected in the detecting step; a moving step of moving the beam spot to the one of said two access regions on the side of the recording medium opposite to the side where the occurrence of a tracking error was detected, if in the position-detecting step the beam spot is detected as being located in the other of said two access regions on the side where the occurrence of a tracking error was detected; and a target track accessing step, responsive to one of said position-detecting step and said moving step, of moving the beam spot to the target track along the one of said two access regions on the side of the recording medium opposite to the side where the occurrence of a tracking error was detected.
Claim 10
Dependent Claim
18 words
A method according to claim 7, wherein said moving step is carried out by conveying the recording medium.
Claim 11
Dependent Claim
23 words
A method according to claim 8, wherein said target track accessing step is carried out by jumping the beam spot track by track.
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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) | 1996-12-27 | 1997-06-28 | 1997-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-27 | 2001-06-28 | 2001-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-27 | 2005-06-28 | 2005-12-28 | $7700.00 | Window Closed / Lapsed |