Apparatus for rotating a light image and an optical system for f

Details Apparatus for rotating a light image and an optical system for f Apparatus for rotating a light image and an optical system for f

1989-01-09

1990-10-02

Arnold, Bruce Y.

Photocopying

Contact printing

Light boxes

350 64, 355 60, 358206, 358489, G02B 2610

Patent

active

049603132

ABSTRACT:
An apparatus for rotating a light image comprises an optical medium such as a Dove prism, an assembly of three mirrors, a triangle prism etc., and a unit for rotating the optical medium. The optical medium is provided with n reflection planes in number each having a normal included in a predetermined plane including a reference light axis, where n is an odd number (n=1, 3, 5 . . . ). When an incident light beam parallel to the reference light axis is supplied to the optical medium, an output light beam having a predetermined rotating angle relative to the incident light beam is obtained by rotating the optical medium around a line parallel to the reference light axis. An optical system for focusing a light image further comprises a light source for radiating a plurality of light beams, and a focusing lens for focusing the light beams on a recording medium such as an optical disk, a photosensitive drum etc. The optical medium is positioned between the light source and the focusing lens, so that a line connecting beam spots formed on the recording medium by focusing the light beams is rotated by rotating the optical medium.

REFERENCES:
patent: 2928952 (1960-03-01), Bednaz
patent: 3647961 (1972-03-01), Blitchington, Jr. et al.
patent: 4376582 (1983-03-01), Kirchner et al.
patent: 4606601 (1986-08-01), Starkweather
patent: 4773754 (1988-09-01), Eisele
Pp. 121 to 126 of the report in "Optical Memory Symposium `86", held on Dec. 17, 1986 in Tokyo.

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