US4420828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording and/or reproducing device
Assignee: Panasonic Holdings Corp
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Filing: 1980-12-15
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Granted: 1983-12-13
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Expires: 2000-12-15
Abstract
Abstract An optical reproducing device for reproducing still image signals recorded on circular tracks and moving image or audio signals recorded on spiral tracks on a disk. Concentric and spiral tracks may be intermingled on the same disk. The address signals for each concentric track or each coil of a spiral track are previously recorded. When the address signals are reproduced, they are processed so as to detect whether the readout address signals changes with time, thereby detecting whether the accessed track is concentric or spiral. An optical head drive system is controlled in a manner depending on whether the track is circular or spiral, so that an optical head can scan the desired concentric or spiral track.
Inventors
- 👤 Tomio Yoshida
- 👤 Michiyoshi Nagashima
- 👤 Shunji Harigae
- 👤 Makoto Ichinose
- 👤 Noboru Wakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/34; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
272 words
An optical reproducing device utilizing an optical record disk having concentric circular guide tracks and spiral guide tracks intermingled thereon, each of said circular tracks and portions of each spiral track with different radii having optically readable information signals therein and an address sector containing an optically readable address signal, said sectors being aligned along a diameter of said disk and subtending the same radial angle, said device comprising: an optical transducer head; a disk carrier for supporting and rotating said optical record disk; transport means for providing relative radial movement between said optical transducer head and said disk carrier; address reading means coupled to said optical transducer head for reading out the address signal from each address sector of said disk; track address change detection means coupled to said address reading means for providing a circular track indication signal when successive address signals read out by said address reading means have identical values, and for providing a spiral track indication signal when said successive address signals have different values from each other; transport control means coupled to said track address change detection means and to said transport means for (i) causing said transport means to provide continuous relative movement between said optical transducer head and said disk carrier in response to said spiral track indication signal, and (ii) interrupting the operation of said transport means to halt said relative radial movement in response to said circular track indication signal; and reproduce control means responsive to said address signals for reproducing said information signals, whereby said device may reproduce signals recorded on intermingled circular and spiral tracks of an optical record disk.
Claim 2
Dependent Claim
272 words
An optical reproducing device utilizing an optical record disk having concentric circular guide tracks and spiral guide tracks intermingled thereon, each of said circular tracks and portions of each spiral track with different radii having optically readable information signals therein and an address sector containing an optically readable address signal, said sectors being aligned along a diameter of said disk and subtending the same radial angle, said device comprising: an optical transducer head; a disk carrier for supporting and rotating said optical record disk; transport means for providing relative radial movement between said optical transducer head and said disk carrier; address reading means coupled to said optical transducer head for reading out the address signal from each address sector of said disk; track address change detection means coupled to said address reading means for providing a circular track indication signal when successive address signals read out by said address reading means have identical values, and for providing a spiral track indication signal when said successive address signals have different values from each other; transport control means coupled to said track address change detection means and to said transport means for (i) causing said transport means to provide continuous relative movement between said optical transducer head and said disk carrier in response to said spiral track indication signal, and (ii) interrupting the operation of said transport means to halt said relative radial movement in response to said circular track indication signal; and reproduce control means responsive to said address signals for reproducing said information signals, whereby said device may reproduce signals recorded on intermingled circular and spiral tracks of an optical record disk.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |