US5400312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of reading datas recorded on an optical disc
Assignee: Pioneer Corp
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Filing: 1993-09-24
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Granted: 1995-03-21
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Expires: 2013-09-24
Abstract
Abstract An apparatus reads data signal recorded on an optical disc on which a gathering track including n recording tracks and a guard track neighboring to the gathering track are spirally formed. The apparatus includes: light beam irradiating unit for irradiating (n+1) light beams onto boundaries of the n recording tracks and the guard track, photodetecting unit for receiving (n+1) light beams reflected by the surface of the optical disc and producing (n+1) track boundary data signals, and computing unit for calculating the (n+1) track boundary data signals to produce n read-out data signals corresponding to the data signals recorded on the n recording tracks.
Inventors
- 👤 Yukiyoshi Haraguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:09
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/14; G11B7/004; G11B7/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
An apparatus for reading data signals recorded on an optical disc on which a gathering track including n recording tracks and a guard track neighboring to the gathering track are spirally formed, wherein the n is an integer and is equal to or greater than 3, said apparatus comprising: light beam irradiating means for irradiating (n+1) light beams onto boundaries of the n recording tracks and the guard track; photodetecting means for receiving (n+1) light beams reflected by the surface of the optical disc and producing (n+1) track boundary data signals, wherein said (n+1) track boundary data signals include said data signals recorded on the recording tracks and the guard track; and computing means for calculating the (n+1) track boundary data signals to produce n read-out data signals corresponding to the data signals recorded on the n recording tracks.
Claim 2
Independent Claim
139 words
An apparatus for reading data signals recorded on an optical disc on which a gathering track including n recording tracks and a guard track neighboring to the gathering track are spirally formed, wherein the n is an integer and is equal to or greater than 3, said apparatus comprising: light beam irradiating means for irradiating (n+1) light beams onto boundaries of the n recording tracks and the guard track; photodetecting means for receiving (n+1) light beams reflected by the surface of the optical disc and producing (n+1) track boundary data signals, wherein said (n+1) track boundary data signals include said data signals recorded on the recording tracks and the guard track; and computing means for calculating the (n+1) track boundary data signals to produce n read-out data signals corresponding to the data signals recorded on the n recording tracks.
Claim 3
Dependent Claim
38 words
An apparatus according to claim 1, further comprising delay means for delaying each of the track boundary data signals to produce track boundary data signals of the same position with respect to the radial direction of the disc.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 1, wherein said light beam irradiating means produces light spots on the optical disc so that the light spotcovers the two neighboring tracks half and half.
Claim 5
Dependent Claim
31 words
An apparatus according to claim 1, wherein the surface of the guard track is finished to be the same reflective condition as the surface of the recording tracks without data pits.
Claim 6
Independent Claim
131 words
A method of reading data signals recorded on an optical disc on which a gathering track including n recording tracks and a guard track neighboring to the gathering track are spirally formed, wherein the n is an integer and is equal or greater than 3, as said method comprising the steps of: irradiating (n+1) light beams onto boundaries of the n recording tracks and the guard track; receiving (n+1) light beams reflected by the surface of the optical disc and producing (n+1) track boundary data signals, wherein said (n+1) track boundary data signals include the data signals recorded on the recording tracks and the guard track; and calculating the (n+l) track boundary data signals to produce n read-out data signals corresponding to the data signals recorded on the n recording tracks.
Claim 7
Independent Claim
131 words
A method of reading data signals recorded on an optical disc on which a gathering track including n recording tracks and a guard track neighboring to the gathering track are spirally formed, wherein the n is an integer and is equal or greater than 3, as said method comprising the steps of: irradiating (n+1) light beams onto boundaries of the n recording tracks and the guard track; receiving (n+1) light beams reflected by the surface of the optical disc and producing (n+1) track boundary data signals, wherein said (n+1) track boundary data signals include the data signals recorded on the recording tracks and the guard track; and calculating the (n+l) track boundary data signals to produce n read-out data signals corresponding to the data signals recorded on the n recording tracks.
Claim 8
Dependent Claim
38 words
A method according to claim 5, further comprising the step of delaying each of the track boundary data signals to produce track boundary data signals of the same position with respect to the radial direction of the disc.
Claim 9
Dependent Claim
26 words
A method according to claim 5, wherein each of said track boundary data signals comprises the recorded data of the two neighboring tracks half and half.
References Cited (Backward Citations)
US5235584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |