Method of counting tracks on disk and track counter circuit ther

Details Method of counting tracks on disk and track counter circuit ther Method of counting tracks on disk and track counter circuit ther

1994-05-31

1995-08-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 58, G11B 7085

Patent

active

054405351

ABSTRACT:
The present track counter circuit is employed for a disk player of three-beam type. The track counter circuit includes a pickup having three sensors, two differential amplifiers, two zero cross detectors, an OR circuit and a counter. The first sensor is divided into two, and receives light reflected from a beam spot formed by a main beam. The outputs of the two sensor portions are applied to a first differential amplifier, the output of which is applied to a first zero cross detector. A second sensor receives light reflected from a beam spot formed by a sub beam, and a third sensor receives light reflected from a beam spot formed by another sub beam. The outputs of the second and third sensors are applied to a second differential amplifier, the output of which is applied to a second zero cross detector. The outputs of first and second zero cross detectors are applied to the OR circuit, and the counter counts crossing pulses therein in response to the OR output. Thus, even if the beam spot by the main beam passes between pits, a dropout track crossing pulse can be supplemented and the number of tracks the pickup has crossed can be accurately counted.

REFERENCES:
patent: 4929822 (1990-05-01), Wakamura et al.
patent: 5313440 (1994-05-01), Fuldner et al.
patent: 5327410 (1994-07-01), Gleim et al.
M. Ogawa et al., "Rapid Access method Using ISO Optical Disk", Extended Abstracts (The 50th Autumn Meeting, 1989), The Japan Society of Applied Physics, No. 3, p. 977 (Japanese public, and English transl.).

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