Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-07-09
1992-02-18
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4426, 369 4441, G11B 700
Patent
active
050900048
ABSTRACT:
In an optical recording and/or reproducing apparatus a main light beam and at least two auxiliary light beams are caused to impinge upon a disc for recording information thereon or reproducing information therefrom in a manner so that light beam spots formed on the disc by two auxiliary light beams are respectively equidistant from a light beam spot formed on the disc by the main light beam with a space between the auxiliary light beam spots in a radial direction of the disc corresponding to N/2 times a track pitch on the disc and the aforementioned light beams are then guided from the disc to a photosensor comprising a first photodetecting element divided into two parts for detecting the main light beam and a second photodetecting element divided into two parts for detecting both auxiliary light beams. A tracking error signal is produced based on a difference between detection outputs derived respectively from two parts of the first photodetecting element and a difference between detection outputs derived respectively from two parts of the second photodetecting element, one of which is subjected to level adjustment for compensating a difference in intensity between the main light beam and each of the auxiliary light beams.
REFERENCES:
patent: 4504938 (1985-03-01), Tajima
patent: 4532522 (1985-07-01), Tsunoda et al.
patent: 4592038 (1986-05-01), Kubota et al.
patent: 4607359 (1986-08-01), Matsubayashi et al.
patent: 4750162 (1988-06-01), Tajima
patent: 4787075 (1988-11-01), Matsuoka et al.
patent: 4831609 (1989-05-01), Suzuki
patent: 4935913 (1990-06-01), Shinoda
patent: 4993011 (1991-02-01), Torazawa et al.
Fukumoto Atsushi
Ohsato Kiyoshi
Envall Jr. Roy N.
Frommer William S.
Sinderbrand Alvin
Sony Corporation
Tran Thang V.
LandOfFree
Tracking system for optical recording and/or reproducing apparat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tracking system for optical recording and/or reproducing apparat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracking system for optical recording and/or reproducing apparat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1828941