Light source unit capable of changing size of light beam spot an

Details Light source unit capable of changing size of light beam spot an Light source unit capable of changing size of light beam spot an

1990-12-21

1992-12-29

LaRoche, Eugene R.

Optical: systems and elements

Optical modulator

Light wave directional modulation

359305, 359315, 385 7, 385 8, 385129, G02B 2608, G02B 610, G02F 133, G02F 129

Patent

active

051756420

ABSTRACT:
A light source unit comprises a laser unit for emitting a laser beam; a deflection element for deflecting the laser beam emitted from the laser unit and for outputting a deflected laser beam, a deflection angle of the deflected laser beam being controlled by a control signal supplied from an external controller to the deflection element; and a shading member for partly or entirely shading the deflected laser beam output from the deflection element, a spot size of a laser beam passing through the shading member being changed in accordance with the deflection angle of the deflected laser beam. The light source unit outputs the laser beam passing through the shading element. An optical scanning image recording apparatus using the above light source unit comprises the light source unit described above, a recording medium on which an image is formed by an optical scanning, and an optical system which moves the light beam output from the light source unit so that the light beam moved by the optical system scans a surface of the recording medium.

REFERENCES:
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4639073 (1987-01-01), Yip et al.
patent: 4929044 (1990-05-01), Arimoto et al.
patent: 5052771 (1991-10-01), Williams et al.

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