Optical pickup device

Details Optical pickup device Optical pickup device

1997-05-30

2000-06-06

Chang, Audrey

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 19, 359566, 369103, 369109, 369 4414, 369 4423, G02B 532, G02B 512, G11B 700

Patent

active

060726075

ABSTRACT:
An optical pickup device of the present invention includes a substrate having at least a major surface, a semiconductor laser provided on the surface of the substrate for emitting laser beam, a reflection-type diffraction grating oriented to the semiconductor laser for splitting the laser beam into at least three beams and reflecting them upward, a hologram for receiving the three beams reflected from the reflection-type diffraction grating, and an objective lens for converging onto an optical recording medium the three beams transmitted by the hologram. The three beams reflected from the optical recording medium are focused by the hologram and directed onto the photodetector from the above.

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patent: 5446719 (1995-08-01), Yoshida
patent: 5481524 (1996-01-01), Ueno et al.

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