Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-01-17
1998-05-05
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369109, 369112, 369 4424, 369 4442, G11B 700
Patent
active
057485992
ABSTRACT:
A light beam emitted from a semiconductor laser element is collimated by a collimating lens, and is applied to an optical disk through a polarizing holographic beam splitter, a .lambda./4 plate and an objective lens, a light beam reflected by the optical disk is applied to the polarizing holographic beam splitter and is diffracted. Diffracted light beams of +1st order and -1st order are applied to two photodetectors, and a focus error signal and a tracking error signal are obtained on the basis of the diffracted light beam of +1st order and an information signal is obtained on the basis of the diffracted light beam of -1st order.
REFERENCES:
patent: 4945529 (1990-07-01), Ono et al.
patent: 5168485 (1992-12-01), Lehureau et al.
patent: 5231620 (1993-07-01), Ohuchida
patent: 5233444 (1993-08-01), Musha
patent: 5367403 (1994-11-01), Yamamoto et al.
patent: 5406543 (1995-04-01), Kobayashi et al.
patent: 5495461 (1996-02-01), Komma et al.
Komma Yoshiaki
Nishino Seiji
Saimi Tetsuo
Wada Hidenori
Yamamoto Hiroaki
Huber Paul W.
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Holographic optical device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Holographic optical device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Holographic optical device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-62988