Hologram unit of optical pickup and method of attaching hologram

Details Hologram unit of optical pickup and method of attaching hologram Hologram unit of optical pickup and method of attaching hologram

1996-12-23

1999-06-01

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

359 15, 359 25, G03H 100, G02B 532

Patent

active

059092939

ABSTRACT:
Disclosed are a hologram unit of an optical pickup which has a main hologram and auxiliary alignment holograms around the main hologram thereof and a method of attaching a hologram plate of the optical pickup comprising the steps of: illuminating an object with an LD; forming an LD radiant point on a monitor through a microscopic lens, and a plurality of radiant points around the LD radiant point by auxiliary alignment holograms; and aligning the LD with the hologram plate by moving the hologram plate so as to form the LD radiant point in the center of the plurality of radiant points.

REFERENCES:
patent: 5523993 (1996-06-01), Freeman
patent: 5648951 (1997-07-01), Kato et al.

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