Optical head apparatus and optical information processing...

Details Optical head apparatus and optical information processing... Optical head apparatus and optical information processing...

2008-07-01

2008-07-01

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112100

Reexamination Certificate

active

10896959

ABSTRACT:
To reduce the optical path length of the entire optical system in a reproduction or recording optical system of an optical recording medium, and promote miniaturization and reductions in costs of apparatuses. An optical head apparatus has an optical system an including a light source and a translucent optical element and irradiates light exiting from the light source, after having been transmitted through the optical element, onto the optical recoding medium. The optical element has a surface or surfaces having negative power on the light-source side and a surface or surfaces having positive power on the optical-recording-medium side. In order to increase the power of the surface or surfaces, one or more of these surfaces are formed as a hologram surface on which a concentric hologram pattern is formed.

REFERENCES:
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patent: 5465247 (1995-11-01), Kobayashi
patent: 5608695 (1997-03-01), Yamazaki
patent: 6014360 (2000-01-01), Yonekubo et al.
patent: 6938890 (2005-09-01), Yoo et al.
patent: 7200098 (2007-04-01), Yoo et al.

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