Method for adjusting a speed-detection device for an object lens in an optical pickup head
AssigneeIndustrial Technology Research Institute
InventorsChih-Chung Wu, Kuo-Ding Shin, Chao-Lin Su, Kai-Wen Cheng
Life of this patent
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Abstract
The invention provides a method for adjusting a speed-detection device for an object lens in an optical pickup head. The invention provides an adjusted optical disc drive, wherein the optical pickup head is accelerated/decelerated and the speed-detection device outputs a standard signal level. Next, the optical pickup head of an unadjusted optical disc drive is accelerated/decelerated under the same condition, and the speed-detection device outputs a speed signal level. Finally, the gain of a programmable gain amplifier is adjusted until the speed signal is equal to the standard signal.
Claims6
A method for adjusting a speed-detection device for an object lens in an optical pickup head, comprising the steps of:
- providing an adjusted optical disc drive, wherein the optical pickup head of the adjusted optical disc drive is immediately stopped from a constant speed, and the speed-detection device in the adjusted optical disc drive outputs a standard signal level;
- providing an unadjusted optical disc drive;
- stopping the optical pickup head of the unadjusted optical disc drive from the constant speed immediately, and obtaining a speed signal level from the speed-detection device of the unadjusted optical disc drive;
- and
- adjusting the unadjusted optical disc drive until the speed signal level is equal to the standard signal level.
A method for adjusting a speed-detection device for an object lens in an optical pickup head, comprising the steps of:
- providing an adjusted optical disc drive, wherein the optical pickup head of the adjusted optical disc drive is immediately accelerated from a first speed to a second speed, and the speed-detection device in the adjusted optical disc drive outputs a standard signal level;
- providing an unadjusted optical disc drive;
- accelerating the optical pickup head of an unadjusted optical disc drive from the first speed to the second speed immediately, and obtaining a speed signal from the speed-detection device of the unadjusted optical disc drive;
- and
- adjusting the unadjusted optical disc drive until the speed signal level is equal to the standard signal level.
Dependencies are inferred from the claim text.