Detecting apparatus for detecting a tracking error signal in an

Details Detecting apparatus for detecting a tracking error signal in an Detecting apparatus for detecting a tracking error signal in an

1995-09-25

1997-09-23

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 58, G11B 7085

Patent

active

056711999

ABSTRACT:
An optical information recording and/or reproducing apparatus has a detecting apparatus for detecting a tracking error signal. The detecting apparatus includes a spot forming system for forming three spots of a main spot, a first subspot, and a second subspot on an optical information recording medium, a light-receiving system for receiving reflected light from the three spots through light-receiving elements corresponding to the respective spots, a first detecting system for detecting a tracking error signal, using an output from the light-receiving element corresponding to the main spot or using outputs from the light-receiving elements corresponding to the main spot, the first subspot, and the second subspot, if there are tracking guide grooves in the optical information recording medium, and a second detecting system for detecting a tracking error signal, using an output from the light-receiving element corresponding to the first subspot and an output from the light-receiving element corresponding to the second subspot, if there is no tracking guide groove in the optical information recording medium.

REFERENCES:
patent: 5130965 (1992-07-01), Karaki et al.
patent: 5138592 (1992-08-01), Fujita
patent: 5166921 (1992-11-01), Matsui
patent: 5363358 (1994-11-01), Yanagawa
"Introduction to Video Discs and Digital Audio Disks for Beginner's" Kabushiki Kaisha Corona Sha. (1st Ed. Nov. 1, 1982), pp. 132-141.
"Simplified Diffraction Theory Of The Video Disk", A. Korpel, Applied Optics, vol. 17, No. 13, pp. 2037-2096 (Jul. 1, 1978).

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