Apparatus and method for minimizing magnification distortion in

Details Apparatus and method for minimizing magnification distortion in Apparatus and method for minimizing magnification distortion in

1987-01-23

1988-08-30

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 55, 369122, 350 64, G11B 714, G02B 2608

Patent

active

047681845

ABSTRACT:
A multi-beam optical recording system includes a semiconductor laser array. The laser beams are expanded via a prism beam expander to have generally circular cross-sections for optimum spot intensity on the recording medium. According to the teaching of the prior art, the average beam angle of incidence on the input prism of the beam expander is the Brewster angle. According to the present invention, means are provided for rotating the beam expander to minimize the variations in spacing between beams, these variations resulting from the magnification distortion of the prisms of the beam expander.

REFERENCES:
patent: 4101199 (1978-07-01), Christensen
patent: 4222071 (1980-09-01), Bell et al.
patent: 4449215 (1984-05-01), Reno
patent: 4453241 (1984-06-01), van de Veerdonk et al.
patent: 4520472 (1985-05-01), Reno
patent: 4545651 (1985-10-01), Kato et al.
patent: 4621351 (1986-11-01), Baer et al.
patent: 4643538 (1987-02-01), Wilson

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