Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-07-07
1980-06-24
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350 68, 358199, G02B 2100
Patent
active
042092230
ABSTRACT:
This specification discloses a scanning device which is capable of providing a light spot moving at a uniform velocity on a surface to be scanned. The scanning device has a light source, an optical system for receiving the beam from the light source and direct a stationary beam to a deflector for collimating the stationary beam into a scanning parallel beam, and a scanning lens sytem for condensing the scanning parallel beam from the deflector onto the surface to be scanned. The deflector is a transparent polygonal member rotatable about a rotation axis at a constant speed and has a hollow portion whose cross-section orthogonal to the rotation axis is a circle centered at said rotation axis. The optical system causes the stationary beam to impinge at right angles from the rotation axis upon the cylindrical surface formed by the hollow portion. The stationary beam is convergent at the focal line of the cylindrical surface, in the first plane perpendicular to the rotation axis, and is parallel in the second plane perpendicular to the first plane. Thus, the beam emergent from the deflector is parallel both in the first and second planes orthogonal with each other. The scanning lens system has a deflection characteristic expressed as: ##EQU1## where y': the distance between an image of the spot and the optical axis of the scanning lens system.
REFERENCES:
patent: 2692369 (1954-10-01), Geiser
patent: 3345120 (1963-10-01), Palmer
patent: 3573849 (1971-04-01), Herrcot
patent: 3885857 (1975-05-01), Flogaus et al.
Canon Kabushiki Kaisha
Corbin John K.
de los Reyes B. W.
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