Tracking error detecting system for removing an offset in an opt

Details Tracking error detecting system for removing an offset in an opt Tracking error detecting system for removing an offset in an opt

1991-04-23

1993-10-12

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4436, 369 4442, 369 54, G11B 7095

Patent

active

052532402

ABSTRACT:
A photodetector is divided into a pair of first segments and a pair of second segments by a common line. A total area of the first segments is larger than an area of a spot reflected from an optical disk onto the first segments. The second segments are provided within the first segments. A total area of the second segments is smaller than the spot. A detecting circuit is provided for producing a tracking error signal by removing a difference between outputs of the first segments and a difference between outputs of the second segments.

REFERENCES:
patent: 4654838 (1987-03-01), Suguki
patent: 4695158 (1987-09-01), Kotaka et al.
patent: 4815060 (1989-03-01), Nomura

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