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US5381392A
Expired / Lapsed
US
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Optical disk reproducing apparatus for identifying whether the disk is a blank disc, partical disc, or a finalized disk
Assignee: Pioneer Corp
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Filing: 1994-05-10
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Granted: 1995-01-10
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Expires: 2014-05-10
Abstract
Abstract An optical disc reproducing apparatus reproduces an optical disc having an information recording surface on which record information and control information are recorded. The apparatus is provided with: a device for rotationally driving the optical disc; a reading device for forming a light spot on the information recording surface, and receiving a reflected light to generate a read signal of the reflected light; a device for reproducing the record information and the control information from the read signal; a device for detecting whether a focus of the light spot is normal or not according to the read signal; a device for detecting whether a rotation number of the optical disc is normal or not according to the read signal; and a device for discriminating the optical disc on the basis of conditions of the detected focus and the detected rotation number.
Inventors
- 👤 Osamu Hira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:46
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/005; G11B19/00; G11B19/02; G11B19/06; G11B19/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
144 words
An optical disc reproducing apparatus for reproducing an optical disc having an information recording surface on which record information and control information are recorded, said apparatus comprising: means for rotationally driving the optical disc; a reading means for forming a light spot on the information recording surface, and receiving a reflected light to generate a read signal of the reflected light; means for reproducing the record information and the control information from the read signal; means for detecting whether a focus of the light spot is normal or not according to the read signal; means for detecting whether a rotation number of the optical disc is normal or not according to the read signal; and means for discriminating whether the optical disc is a partial optical disk recordable or not on the basis of conditions of the detected focus and the detected rotation number.
Claim 2
Dependent Claim
144 words
An optical disc reproducing apparatus for reproducing an optical disc having an information recording surface on which record information and control information are recorded, said apparatus comprising: means for rotationally driving the optical disc; a reading means for forming a light spot on the information recording surface, and receiving a reflected light to generate a read signal of the reflected light; means for reproducing the record information and the control information from the read signal; means for detecting whether a focus of the light spot is normal or not according to the read signal; means for detecting whether a rotation number of the optical disc is normal or not according to the read signal; and means for discriminating whether the optical disc is a partial optical disk recordable or not on the basis of conditions of the detected focus and the detected rotation number.
Claim 3
Dependent Claim
55 words
An apparatus according to claim 1, wherein said reading means comprises: an optical pickup for irradiating a laser beam, and generating a RF signal; a servo-mechanism for moving and positioning the optical pickup in a radial direction of the optical disc; and an automatic power controller for controlling an output power of the laser beam.
Claim 4
Dependent Claim
19 words
An apparatus according to claim 1, wherein said reproducing means comprises a pre-amplifier, a decoder and a D/A convertor.
Claim 5
Dependent Claim
32 words
An apparatus according to claim 1, further comprising means for controlling the driving means, the reading means and the reproducing means to operate a reproduction operation corresponding to the discriminated optical disc.
Claim 6
Dependent Claim
24 words
An apparatus according to claim 4, wherein said discriminating means and said controlling means comprise a system controller including a microprocessor and a memory.
Claim 7
Dependent Claim
54 words
An apparatus according to claim 4, wherein said controlling means is adapted to control said reading means to move a reading position thereof to a predetermined initial reading position of said optical disc upon starting a set-up process, and said focus detecting means is adapted to detect the focus at the initial reading position.
Claim 8
Dependent Claim
30 words
An apparatus according to claim 6, wherein said controlling means is adapted to perform the set-up process again when said focus detecting means detects an abnormal condition of the focus.
Claim 9
Dependent Claim
66 words
An apparatus according to claim 4, wherein said controlling means is adapted to control the reading means to move a reading position thereof to an inner circumference of the optical disc if the focus detecting means and the rotation number detecting means detect normal conditions, and start the reproduction operation of the record information from the inner circumference toward an outer circumference of the optical disc.
Claim 10
Dependent Claim
31 words
An apparatus according to claim 1, wherein said rotation number detecting means is adapted to detect the rotation number after the focus detecting means detects a normal condition of the focus.
Claim 11
Dependent Claim
37 words
An apparatus according to claim 9, wherein said focus detecting means is adapted to detect the focus again when said rotation number detecting means detects an abnormal condition of the rotation number for a predetermined time period.
Claim 12
Dependent Claim
18 words
An apparatus according to claim 1, wherein said partial optical disc recordable is a partial compact disc recordable.
Claim 13
Dependent Claim
46 words
An apparatus according to claim 1, wherein said discriminating means discriminates whether the optical disc is the partial optical disc recordable, a blank optical disc recordable, or a finalized optical disc recordable on the basis of conditions of the detected focus and the detected rotation number.
Claim 14
Dependent Claim
18 words
An apparatus according to claim 12, wherein said partial optical disc recordable is a partial compact disc recordable.
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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |