Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-03-11
1999-09-07
Hindi, Nabil
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369112, G11B 700
Patent
active
059497483
ABSTRACT:
A compatible optical pickup for DVD and CD in which, between an objective lens and a polarizing beam splitter, there is disposed a transmission type liquid crystal panel which has transparent electrodes formed with an aperture pattern having a predetermined configuration which gives transmitted light a phase difference, such as 1/4 of a wavelength or an odd multiple thereof. The liquid crystal panel is tilted and disposed with a predetermined angle between an objective lens and said laser light source for causing a phase difference in a laser beam emitted from said laser light source, whereby the liquid crystal panel is tilted with a predetermined pretilted angle .theta. so that liquid crystal molecules are aligned, in perpendicular relation to (for P-type liquid crystal) or in parallel relation with (for N-type liquid crystal) an optical axis of the objective lens at the time when no voltage is applied.
REFERENCES:
patent: 4853911 (1989-08-01), Yamazaki
patent: 5210627 (1993-05-01), Toide et al.
patent: 5563870 (1996-10-01), Silverstein
patent: 5594713 (1997-01-01), Komma et al.
Iwasaki Masayuki
Ootaki Sakashi
Hindi Nabil
Pioneer Electronic Corporation
LandOfFree
Optical write/read head with a pretilted liquid crystal panel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical write/read head with a pretilted liquid crystal panel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical write/read head with a pretilted liquid crystal panel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1811279