Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-26
1993-02-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
359202, H01J 314
Patent
active
051840120
ABSTRACT:
An optical scanning apparatus comprises a light source, a converging lens for converging a beam emitted by the light source and forming a beam spot on an object, a first optical deflecting system, movably arranged in the optical path and between the light source and the converging lens, for causing the beam spot formed on the object to move in a first direction, a second optical deflecting system, movably arranged in the optical path and between the first optical deflecting system and the converging lens, for causing the beam spot to move in a second direction, and a movable mirror, arranged in the optical path and between the light source and the first optical deflecting system for correcting the deviation of the optical axis due to the movement of the first and second optical deflecting system. At least one of the first and second deflecting means is moved so that a conjugate plane with respect to the pupil of the converging lens is located at a desired portion between the first and second optical deflecting system.
REFERENCES:
patent: 4714830 (1987-12-01), Usui
patent: 4734578 (1988-03-01), Horikawa
patent: 5035476 (1991-07-01), Ellis et al.
Nelms David C.
Olympus Optical Co,. Ltd.
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