Optical head device and birefringent diffraction grating polariz

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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

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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.

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