Optical head with easily adjustable collimator having two lens c

Details Optical head with easily adjustable collimator having two lens c Optical head with easily adjustable collimator having two lens c

1986-11-26

1989-04-18

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

350479, 350480, G11B 700

Patent

active

048233340

ABSTRACT:
An optical head for a recording/reproducing apparatus optically recording and/or reading information onto or from a recording medium, collimates a divergent light beam radiated from a light source into a parallel light beam using a collimator lens comprised of the first and second lenses. Collimation can precisely be adjusted by adjusting only the position of second lens. The first lens is a positive lens. The second lens has a power less than the total power of the collimator lens. Collimation adjustment can be done with extreme accuracy even when disposing a prism in the path of the parallel light beam.

REFERENCES:
patent: 4264986 (1981-04-01), Willis
patent: 4621351 (1986-11-01), Baer et al.

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