Hologram laser unit and optical pickup apparatus

Details Hologram laser unit and optical pickup apparatus Hologram laser unit and optical pickup apparatus

2005-08-22

2008-10-14

Assaf, Fayez G (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S569000, C369S112170

Reexamination Certificate

active

07436561

ABSTRACT:
A laser light beam of a first wavelength which is polarized in a first polarizing direction, emitted from first and second semiconductor laser elements and reflected by an information recording surface of an optical recording medium, is made to be transmitted by a second polarizing hologram diffraction grating and diffracted in a direction toward a light receiving element by a first polarizing hologram diffraction grating. A laser light beam of a second wavelength which is polarized in the first polarizing direction, reflected by the information recording surface of the optical recording medium, is made to be converted so to be in a second polarizing direction by the 5λ/4 plate. A laser light beam of the second wavelength which is polarized in the second polarizing direction is made to be diffracted in the direction toward the light emitting element by the second polarizing hologram diffraction grating.

REFERENCES:
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patent: 2004/0001419 (2004-01-01), Ariyoshi et al.
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patent: 2004-146006 (2004-05-01), None

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