Optical head device and birefringent diffraction grating polariz

Details Optical head device and birefringent diffraction grating polariz Optical head device and birefringent diffraction grating polariz

1996-02-23

1997-08-19

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369112, 359494, 359495, 359572, G11B 700, G02B 530

Patent

active

056595310

ABSTRACT:
An optical head device uses a birefringent diffraction grating polarizer configured in a reflection type. The device includes a polarizing hologram element which reflects the light from a light source to a converging lens system and diffracts the polarized light returning from a recording medium. A total reflection film is formed on a surface of a diffraction grating which is provided periodically by an ion exchange region and a dielectric film on a surface of a crystal plate having optically anisotropic characteristics. A polarizing beam splitter film formed on a surface of the polarizing hologram element has reflectivity and transmissivity having dependency on the polarization of the incident light. In another form, a polarizing hologram element includes a polarizing hologram which has diffractive efficiency having dependency on polarization of incident light and a polarizing beam splitter film which has reflectivity and transmissivity having dependency on the polarization of the incident light. The diffracted light is received by multi-split photodetectors. The arrangements enable to make the optical head device compact, light in weight and low cost.

REFERENCES:
patent: 4753513 (1988-06-01), Shikama
patent: 4846552 (1989-07-01), Veldkamp et al.
patent: 4937808 (1990-06-01), Shimada et al.
patent: 4991937 (1991-02-01), Urino
patent: 5029988 (1991-07-01), Urino
patent: 5245471 (1993-09-01), Iwatsuka et al.
patent: 5367403 (1994-11-01), Yamamoto et al.
patent: 5377177 (1994-12-01), Horinouchi et al.
patent: 5404344 (1995-04-01), Imada et al.
patent: 5422870 (1995-06-01), Kojima et al.
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5453963 (1995-09-01), Katayama et al.
patent: 5455712 (1995-10-01), Yamamoto et al.
patent: 5535055 (1996-07-01), Ono et al.

Affiliated with

Also associated with

Rating

Optical head device and birefringent diffraction grating polariz 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 device and birefringent diffraction grating polariz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head device and birefringent diffraction grating polariz will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1110049