Optical scanner

Details Optical scanner Optical scanner

1990-05-02

1991-07-23

Arnold, Bruce Y.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 61, 350 68, 2502011, 250234, 346 11, G02B 2610

Patent

active

050338064

ABSTRACT:
An optical scanner has a light source device for emitting an approximately parallel light beam polarized approximately linearly; a deflector for deflecting the light beam from this light source device toward a scanned face; an image forming optical system including an optical element having a focal length variable by an electrooptic medium, the image forming optical system being arranged between the light source device and the deflector to form the light beam from the light source device as an image in the shape of a spot on the scanned face; a controller for controlling the focal length of the image forming optical system; and an electrode pair disposed in the electrooptic medium of the optical element, the arrangement position and shape of the respective electrodes being constructed such that a convergent position of the emitted light can be changed when a voltage is applied by the controller between these electrodes; the controller controlling the focal length of the image forming optical system such that field curvature is removed in synchronization with an optical scanning operation, or the diameter of the formed image spot is approximately constant irrespective of the optical scanning position. Another optical scanner is also shown.

REFERENCES:
patent: 4316196 (1982-02-01), Jacobs
patent: 4420772 (1983-12-01), Jacobs
patent: 4455485 (1984-06-01), Hosake et al.
patent: 4733064 (1988-03-01), Ishikawa

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