Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Reexamination Certificate
2007-07-17
2007-07-17
Allen, Stephone B. (Department: 2872)
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
C359S573000, C365S125000, C365S216000, C369S112050, C369S112100, C369S112150
Reexamination Certificate
active
10453073
ABSTRACT:
A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base thickness of about 0.6 mm for a red light beam (wavelength λ2). In an inner circumferential portion of the hologram, a grating is formed. The hologram transmits a blue light beam as 0th-order diffracted light without diffracting it, and disperses a red light beam passing through an inner circumferential portion as +1st-order diffracted light and allows it to be condensed by an objective lens. Because of this, the focal length of the red light beam becomes longer than that of the blue light beam, whereby a working distance is enlarged.
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Chapel Derek S.
Hamre Schumann Mueller & Larson P.C.
Matsushita Electric - Industrial Co., Ltd.
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