Claims
- 1. An optical disk reproducing apparatus, comprising:
- a pickup for reading recorded data from an optical disk;
- focus error signal generating means for generating a focus error signal from light read out by said pickup;
- focus search means for supplying a focus drive signal to said pickup to perform a focus search;
- detector means for detecting a desired recording layer in response to said focus error signal, wherein said detector means comprises:
- zero-cross detector means for detecting the zero-cross of said focus error signal; and
- counter means for counting the occurrences of detection of said zero cross;
- control means for stopping the supply of said focus drive signal in response to a detection signal from said detector means;
- storage means for storing a layer number of a layer currently reproduced;
- first comparator means for comparing a layer number reproduced after a focus jump with said layer number stored in said storage means; and
- second comparator means for performing said focus search when the result of said comparison exhibits non-coincidence and for comparing said layer number stored in said storage means with the occurrences of detection of the zero-cross of the focus error signal such that said control means is further operable to stop the supply of said focus drive signal when the result of said comparison by said second comparator means exhibits coincidence.
- 2. An optical disk reproducing method, comprising the steps of:
- supplying a focus drive signal to said pickup to perform a focus search;
- detecting a recording layer number in response to a focus error signal by detecting the zero-cross of said focus error signal, and counting the occurrences of detection of said zero-cross;
- stopping the supply of said focus drive signal when the detected recording layer number coincides with a desired layer number;
- storing a layer number of a layer currently reproduced;
- comparing a layer number reproduced after a focus jump with the stored layer number;
- performing a focus jump when the result of the comparison exhibits non-coincidence;
- comparing the stored layer number with the occurrences of detection of the zero-cross of the focus error signal; and
- stopping the supply of the focus drive signal when the result of the comparison of the stored layer number with the occurrences of detection of the zero-cross of the focus error signal exhibits coincidence.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-306971 |
Nov 1994 |
JPX |
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Parent Case Info
This application is a division of application Ser. No. 08/577,626, filed Nov. 14, 1995.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5060215 |
Kawamura et al. |
Oct 1991 |
|
5263011 |
Maeda et al. |
Nov 1993 |
|
5408453 |
Holtslag et al. |
Apr 1995 |
|
5428597 |
Satoh et al. |
Jun 1995 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
60-226029 |
Nov 1985 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
557626 |
Nov 1995 |
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