Optical pickup having first and second reflecting surfaces and h

Details Optical pickup having first and second reflecting surfaces and h Optical pickup having first and second reflecting surfaces and h

1992-09-28

1994-12-27

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369118, G11B 700

Patent

active

053771770

ABSTRACT:
An optical pickup to be used in an optical disc apparatus for optically recording and reproducing information on and from an optical disc. The optical pickup is arranged such that a laser light from a semiconductor laser is reflected plural times within an optical system and then focused on the optical disc and the light from the optical disc is diffracted by a hologram and then received by a light-receiving device for reproducing the information recorded on the optical disc. This arrangement can achieve the size-reduction of the optical pickup concurrently with obtaining a necessary optical path length.

REFERENCES:
patent: 4731772 (1988-03-01), Lee
patent: 4757197 (1988-07-01), Lee
patent: 5070494 (1991-12-01), Emoto et al.
patent: 5111448 (1992-05-01), Komma et al.
patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5198916 (1993-03-01), Kim

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