Optical head including a collimator having lenses of different f

Details Optical head including a collimator having lenses of different f Optical head including a collimator having lenses of different f

1988-07-12

1990-10-23

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 712

Patent

active

049657852

ABSTRACT:
Provided is an optical recording and reproducing apparatus in which a collimator lens collimates divergent light fluxes from a light source to emit parallel light fluxes and then an objective lens converges the parallel light fluxes onto an information carrier. The collimator lens comprises a first lens having a first predetermined focal distance and a second lens having a second predetermined focal distance which is longer than the first predetermined focal distance. The second lens can be moved in the optical-axis direction so as to adjust the relative position of the collimator lens and the light source.

REFERENCES:
patent: 4521680 (1985-06-01), Ando
patent: 4823334 (1989-04-01), Tanaka et al.
Japanese Patent Public Disclosure (Kokai), Nos. 61-210541 and 62-12934.

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