US4759006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abnormal track skipping detection and control arrangement
Assignee: Panasonic Holdings Corp
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Filing: 1987-04-27
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Granted: 1988-07-19
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Expires: 2007-04-27
Abstract
Abstract A track skipping detection and control arrangement for an optical recording and reproducing disc formed with guide tracks for use in an optical information recording and reproducing apparatus. According to the track skipping detection and control arrangement of the present invention, any sudden track skipping which may take place during recording can be instantaneously detected by the track traversing signal so as to reduce the recording power for the prevention of erroneous recording to neighboring tracks. Moreover, by distinguishing the track traversing signal detected during the jumping operation for repeated continuous reproduction of the particular one track of the optical disc having spiral tracks, from the traversing signal due to the track skipping, erroneous recording may be similarly prevented also with respect to the optical disc having the tracks in the spiral configuration.
Inventors
- 👤 Kenji Koishi
- 👤 Tomio Yoshida
- 👤 Isao Satoh
- 👤 Shunji Ohara
- 👤 Yuzuru Kuroki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:24
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B19/00; G11B19/02; G11B19/04; G11B7/08; G11B7/085; G11B7/08505; G11B7/09; G11B7/0946; Y; Y10; Y10S; Y10S358/00; Y10S358/907
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
307 words
An abnormal track skipping detection and control arrangement which comprises: a means for irradiating a light beam, which has been converged into a spot of light of a very small diameter, onto an optical disc provided with undulation free groove-like guide tracks in a concentric or spiral configuration; a means for subjecting said spot of light to a tracking control with respect to said guide tracks; a means for recording and reproducing information by recording light and reproducing light from said light irradiating means; a means for detecting during recording that said spot of light has unnecessarily caused a track skipping from the guide track effecting recording of information to another guide track, and a means for varying a light power output of said light irradiating means from a recording state power to a non-recording state power instantaneously upon a detection of said track skipping; said detecting means including a two divisional photo-detector having a dividing boundary line thereof disposed in a direction parallel to a tangential direction of said guide tracks so as to receive a reflected light or a transmitted light from said spot of light, said photo-detector having a means for detecting abnormal track skipping by detecting a difference signal produced by said photo-detector when said spot of light traverses said guide tracks; further including a means for controlling said light power output of said light irradiating means from said non-recording state power into another reproducing state power; further including a means for differentiating between a first track traversing signal detected during a jumping operation period for continuously reproducing one specific track in said guide tracks when said tracks are in a spiral configuration, from a second other track traversing signal detected when abnormal track skipping has taken place, using jumping section pulses generated by said tracking control means during said abnormal jumping operation.
Claim 2
Dependent Claim
307 words
An abnormal track skipping detection and control arrangement which comprises: a means for irradiating a light beam, which has been converged into a spot of light of a very small diameter, onto an optical disc provided with undulation free groove-like guide tracks in a concentric or spiral configuration; a means for subjecting said spot of light to a tracking control with respect to said guide tracks; a means for recording and reproducing information by recording light and reproducing light from said light irradiating means; a means for detecting during recording that said spot of light has unnecessarily caused a track skipping from the guide track effecting recording of information to another guide track, and a means for varying a light power output of said light irradiating means from a recording state power to a non-recording state power instantaneously upon a detection of said track skipping; said detecting means including a two divisional photo-detector having a dividing boundary line thereof disposed in a direction parallel to a tangential direction of said guide tracks so as to receive a reflected light or a transmitted light from said spot of light, said photo-detector having a means for detecting abnormal track skipping by detecting a difference signal produced by said photo-detector when said spot of light traverses said guide tracks; further including a means for controlling said light power output of said light irradiating means from said non-recording state power into another reproducing state power; further including a means for differentiating between a first track traversing signal detected during a jumping operation period for continuously reproducing one specific track in said guide tracks when said tracks are in a spiral configuration, from a second other track traversing signal detected when abnormal track skipping has taken place, using jumping section pulses generated by said tracking control means during said abnormal jumping operation.
Claim 3
Dependent Claim
265 words
In an optical recording and reproducing apparatus arranged to irradiate light from a laser light source as converged into a spot of light, onto an optical disc provided with guide tracks for recording and reproduction of information, an abnormal track skipping detection and control arrangement which comprises a two divisional photo-detector having a dividing boundary line thereof disposed in a direction parallel to a tangential direction of the guide tracks so as to receive the light reflected from the optical disc and adapted to detect, from a difference signal of an output of said two divisional photo-detector, that an abnormal track skipping has unnecessarily taken place from a guide track effecting the recording of information to another guide track not required for recording of information, and means for varying light power of said laser light source from a recording state to a reproducing state; wherein said guide tracks are in a spiral configuration, and said detecting and control arrangement includes means disposed such that during a normal track jumping operation period for starting the track skipping per each rotation of the optical disc, in order to cause the guide track of the same circumference to continuously effect the tracking function, the normal track traversing signal detected from the difference signal of said output of said two divisional photo-detector and an abnormal track skipping detection signal for detecting that the abnormal track skipping has unnecessarily taken place to the guide track not required for the recording, are differentiated from each other using a track jump starting pulse which is produced during the track jumping operation period.
Claim 4
Dependent Claim
265 words
In an optical recording and reproducing apparatus arranged to irradiate light from a laser light source as converged into a spot of light, onto an optical disc provided with guide tracks for recording and reproduction of information, an abnormal track skipping detection and control arrangement which comprises a two divisional photo-detector having a dividing boundary line thereof disposed in a direction parallel to a tangential direction of the guide tracks so as to receive the light reflected from the optical disc and adapted to detect, from a difference signal of an output of said two divisional photo-detector, that an abnormal track skipping has unnecessarily taken place from a guide track effecting the recording of information to another guide track not required for recording of information, and means for varying light power of said laser light source from a recording state to a reproducing state; wherein said guide tracks are in a spiral configuration, and said detecting and control arrangement includes means disposed such that during a normal track jumping operation period for starting the track skipping per each rotation of the optical disc, in order to cause the guide track of the same circumference to continuously effect the tracking function, the normal track traversing signal detected from the difference signal of said output of said two divisional photo-detector and an abnormal track skipping detection signal for detecting that the abnormal track skipping has unnecessarily taken place to the guide track not required for the recording, are differentiated from each other using a track jump starting pulse which is produced during the track jumping operation period.
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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |