Optical element and optical pickup device

Details Optical element and optical pickup device Optical element and optical pickup device

2008-05-13

2008-05-13

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

C369S112010, C359S833000

Reexamination Certificate

active

07372798

ABSTRACT:
An optical element has a dichroic film held between transparent materials which transmits one of first light in a wavelength range of 390 to 425 nm and second light in a wavelength range of 630 to 820 nm and reflects the other light, and a first, a second, a third and a fourth surfaces. In the optical element, a first anti-reflection film for preventing reflection of the first light is formed on the first surface, a second anti-reflection film for preventing reflection of the second light is formed on the second surface, and a third anti-reflection film for preventing the reflection of the first and the second light is formed on the third surface from which the incident light of the first surface and the second surface is emitted. In the third anti-reflection film, reflectance of the second light is larger than that of the first light.

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patent: 6870694 (2005-03-01), Nishi et al.
patent: 2005/0122883 (2005-06-01), Kimura
patent: 7301703 (1995-11-01), None
patent: 2002 365411 (2002-12-01), None
patent: 2003 222707 (2003-08-01), None

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