Optical pickup

Details Optical pickup Optical pickup

1992-01-27

1993-03-30

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359566, 359728, 369 4423, G02B 532, G02B 302, G11B 700

Patent

active

051989166

ABSTRACT:
An optical pickup, installed in an optical or magneto-optical disc driver, for reproducing/recording optical information is disclosed. The optical pickup is of a subminiature united body type and very light weight, high speed seek, and is composed of an optical system including a hologram lens element. The hologram of the lens element is formed of a predetermined pattern which diffracts a spherical wave and focuses reflected light from the disc onto a detector offset from the light source. This optical pickup can reproduce optical information having no interference and detect focus and track errors without an optical element separating the incident light and reflected light by a hologram pattern. Accordingly, a very light, subminiature optical pickup composed of an optical system having one lens element is provided.

REFERENCES:
patent: 4689479 (1987-08-01), Tatsuno et al.
patent: 4868803 (1989-09-01), Sunagawa et al.
patent: 4885732 (1989-12-01), Sunagawa et al.
patent: 4929823 (1990-05-01), Kato et al.
patent: 4945527 (1990-07-01), Sunagawa
patent: 5111448 (1992-05-01), Komma et al.

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