Patent US5038332A successfully refreshed from Google Patents.
US5038332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium including an optically detectable mark representing a boundary between the recording and non-recording areas
Assignee: Canon Inc
•
Filing: 1990-07-06
•
Granted: 1991-08-06
•
Expires: 2010-07-06
Abstract
Abstract An optical information recording medium includes a plurality of rows of tracking tracks arranged at intervals, a plurality of recording portions provided between the tracking tracks and on which information is recorded by application of a light beam thereto, and an optically detectable mark provided at at least one location on at least one of the recording portions. The recording surface of the recording medium is divided into a recording area and a non-recording area in a direction perpendicular to direction of the plurality of rows of the tracking tracks. The optically detectable mark represents a boundary of the recording area and the non-recording area.
Inventors
- 👤 Wataru Sakagami
- 👤 Yutaka Ogasawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:48
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B23/00; G11B23/30; G11B23/36; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B7/002; G11B7/0033; G11B7/007; G11B7/00745; G11B7/013; G11B7/08; G11B7/09; G11B7/0901; G11B7/0938
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
An optical information recording medium comprising: a plurality of rows of tracking tracks arranged in an arrangement direction at intervals on the recording medium; a plurality of recording portions provided between rows of said tracking tracks and on which information is recorded by application of a light beam thereto; a recording area including at least one of said plurality of tracking tracks and said plurality of recording portions in the arrangement direction of said tracks; at least two guard tracks arranged in regions on either side of the recording area, the guard track regions being outside of the recording area; and an optically detectable indicator outside of the recording area for distinguishing said guard tracks from said tracking tracks.
Claim 2
Dependent Claim
119 words
An optical information recording medium comprising: a plurality of rows of tracking tracks arranged in an arrangement direction at intervals on the recording medium; a plurality of recording portions provided between rows of said tracking tracks and on which information is recorded by application of a light beam thereto; a recording area including at least one of said plurality of tracking tracks and said plurality of recording portions in the arrangement direction of said tracks; at least two guard tracks arranged in regions on either side of the recording area, the guard track regions being outside of the recording area; and an optically detectable indicator outside of the recording area for distinguishing said guard tracks from said tracking tracks.
Claim 3
Dependent Claim
34 words
An optical information recording medium according to claim 1, wherein said indicator is provided in the arrangement direction of said tracking tracks in the guard track regions on either side of the recording area.
Claim 4
Dependent Claim
16 words
An optical information recording medium according to claim 1, wherein said indicator comprises a discontinuous pattern.
Claim 5
Dependent Claim
27 words
An optical information recording medium according to claim 1, further comprising an additional optically detectable indicator provided between said guard tracks for indicating type of recording medium.
Claim 6
Dependent Claim
30 words
An optical information recording medium according to claim 4, wherein said additional optically detectable indicator comprises a format different from that of information to be recorded in the recording area.
Claim 7
Dependent Claim
24 words
An optical information recording medium according to claim 4, wherein said additional optically detectable indicator comprises a repetition pattern including a plurality of marks.
References Cited (Backward Citations)
US3351948A
Cited
US4229808A
Cited
US4695991A
Cited
US4680460A
Cited
US4534031A
Cited
JPS5960742A
Cited
GB2133914A
Cited
US4688203A
Cited
JPS59207039A
Cited
GB2156978A
Cited
US4598393A
Cited
US4769802A
Cited
US4811321A
Cited
EP0231009A2
Cited
US4910725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |