Signal detecting system in optical information reading apparatus

Details Signal detecting system in optical information reading apparatus Signal detecting system in optical information reading apparatus

1981-12-23

1984-04-24

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369109, G11B 712

Patent

active

044452080

ABSTRACT:
In a signal detecting system in an optical information reading apparatus wherein, in order that a tracking signal having few errors can be obtained, the pupil of an objective used to project a light from a light source as a spot onto the information recording track of a disk, collect the light reflected on the disk and lead it to a light receiving device is covered in the form of a band or a cover plate placed in front of detectors of the light receiving device to intercept a part of the light entering the dectector.

REFERENCES:
patent: 4011400 (1977-03-01), Simons
patent: 4349901 (1982-09-01), Howe
Position sensing in video disk readout.

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