Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-06-12
1997-03-18
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 58, G11B 7095
Patent
active
056129378
ABSTRACT:
An optical pickup apparatus including: an irradiation optical system for irradiating a light beam to at least one track of a recording medium carrying a recorded signal to be read, an image formation device for preforming an image formation of a real image for the recorded signal or track of the recording medium to make an image surface by using a reflected light from an irradiated portion of the light beam, and a photodetector for detecting the reflected light and having an optical receiving element disposed on the image surface. The optical receiving element has at least one first optical receiving element for tracking control which is bisected in a track image direction formed on the image surface such that the first optical receiving element has a width in a perpendicular direction to the track direction smaller than a distance represented by twice a track pitch in a track image formed on the first optical receiving element less a width of the track image. The optical receiving element further includes at least one second optical receiving element of signal-reading disposed adjacent to the first optical receiving element in the track image direction. The optical pickup apparatus is thus capable of stably reading a recorded signal from the optical disk and of stably performing a tracking operation by its simple construction.
REFERENCES:
patent: 4283777 (1981-08-01), Curry et al.
patent: 4695992 (1987-09-01), Aio
patent: 4783589 (1988-11-01), Ando
patent: 5155718 (1992-10-01), Hashimoto et al.
patent: 5329508 (1994-07-01), Matsueda
Pioneer Electronic Corporation
Young W. R.
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