Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-06-19
2000-01-11
Edun, Muhammad
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369109, 369110, 369 4412, G11B 7135
Patent
active
060143592
ABSTRACT:
Disclosed is an optical head, which has: a light generator which emits linearly polarized light; a lens which converges the light emitted from the light generator on a medium; a light detector which receives the light reflected on the medium; a quarter-wave plate which is disposed between the light generator and the lens and rotates by .pi./2 radian a polarization direction of the linearly polarized light when going and returning through the quarter-wave plate; a polarizing diffractive element which is disposed between the light generator and the quarter-wave plate, the polarizing diffractive element transmitting the light travelling from the light generator to the quarter-wave plate and diffracting the light travelling from the quarter-wave plate to the light generator by using a difference in polarization direction; and a polarizing beam splitter which is disposed among the light generator, the light detector and the polarizing diffractive element, the polarizing beam splitter directing the light from the light generator to the polarizing diffractive element and directing the light from the polarizing diffractive element to the light detector by using a difference in polarization direction; wherein the light detector receives the light diffracted by the polarizing diffractive element and the light transmitted through the polarizing diffractive element.
REFERENCES:
patent: 5517480 (1996-05-01), Matsuoka et al.
patent: 5600614 (1997-02-01), Katayama
patent: 5644413 (1997-07-01), Komma et al.
patent: 5659533 (1997-08-01), Chen et al.
patent: 5677902 (1997-10-01), Brazas, Jr.
patent: 5684780 (1997-11-01), Ando
patent: 5696750 (1997-12-01), Katayama
patent: 5748574 (1998-05-01), Chao
Edun Muhammad
NEC Corporation
LandOfFree
Optical head with a polarizing diffractive element 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 head with a polarizing diffractive element, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head with a polarizing diffractive element will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1467503