Claims
- 1. An optical information recording/reproducing apparatus for effecting at least one of recording and reproducing of information on/from an optical information recording medium having a plurality of tracks by employing a light beam, comprising:
- an optical system for irradiating a desired track on the recording medium with the light beam;
- tracking and focusing error detecting means for detecting tracking and focusing errors of the light beam with respect to the desired track and for outputting an analog signal corresponding to the tracking and the focusing errors;
- a tracking and focusing actuator for moving at least a part of said optical system in order to move the light beam with respect to the desired track on the recording medium and to adjust a focusing state of the light beam with respect to the recording medium;
- A/D conversion means for converting the analog signal output from said tracking and focusing error detecting means into a digital signal;
- calculating means for calculating a control amount of said tracking and focusing actuator by processing the digital signal converted by said A/D conversion means on the basis of a predetermined calculation equation in order to correct the tracking and focusing errors of the light beam, said calculating means outputting a digital signal;
- memory means for storing a plurality of calculation equations each having a different order which are employed by said calculating means and correspond to a plurality of operation states or operation environments of said apparatus; and
- D/A conversion means for converting the digital signal output from said calculating means into an analog signal,
- wherein said tracking and focusing actuator is driven ill accordance with the analog signal output from said D/A conversion means, and said calculating means selects a calculation equation having an order different from that of the calculation equation which is being employed among said plurality of calculation equations each having a different order stored in said memory means, in accordance with a variation in the operation state or operation environment of said apparatus, said calculating means performing a calculation on the basis of the selected calculation equation.
- 2. An apparatus according to claim 1, further comprising data input means connected to said memory means, wherein the calculation equation stored in said memory means is rewritten by the data input means.
- 3. An apparatus according to claim 1, wherein said memory means comprises a plurality of memory portions, and the plurality of calculation equations are stored in the memory portions each differing each other, respectively.
- 4. An apparatus according to claim 1, wherein the selection of the calculation equation by said calculation means is effected upon the performing of a tracking operation and focusing operation.
- 5. An apparatus according to claim 1, wherein the selection of the calculation equation by said calculating means is effected when the recording medium having a different reflectance is used.
- 6. An apparatus according to claim 1, wherein the selection of the calculation equation by said calculating means is effected before tracking and/or focusing operation and upon the operation.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1-107762 |
Apr 1989 |
JPX |
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2-103055 |
Apr 1990 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/351,035 filed Nov. 28, 1994, which is a continuation of application Ser. No. 07/514,320 filed Apr. 25, 1990, both now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0249462 |
Dec 1987 |
EPX |
0292917 |
Nov 1988 |
EPX |
63-121136 |
May 1988 |
JPX |
2158611 |
Nov 1985 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Katsuhara, et al., "Fine Seek Technique," Japanese Journal of Applied Physics/Supplements, vol. 26, No. 26-4, 1987, Tokyo, Japan, pp. 191-194. |
Continuations (2)
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Number |
Date |
Country |
Parent |
351035 |
Nov 1994 |
|
Parent |
514320 |
Apr 1990 |
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