Laser beam scanning apparatus having a variable focal distance d

Details Laser beam scanning apparatus having a variable focal distance d Laser beam scanning apparatus having a variable focal distance d

1990-12-20

1993-03-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359254, 385 3, H01J 314

Patent

active

051966972

ABSTRACT:
In a variable density scanning apparatus, a variable focal distance device is provided in a scanning optical system. This variable focal distance device is formed of a light waveguide having a plurality of electrodes, of which the lengths along the direction of an incident laser beam are decreased or increased with the increase of the distance from the central electrode. The voltage to be applied between the electrodes is controlled in accordance with a desired dot pattern so as to change the refractive index of the light waveguide through which the laser beam is passed, thereby effectively changing the focal distance so that the diameter of the scanning laser beam spot can be changed in one dimension.

REFERENCES:
patent: 4614408 (1986-09-01), Mir et al.
patent: 4768043 (1988-08-01), Saito et al.
patent: 4798437 (1989-01-01), Rediker et al.
"Optical Systems of an Ultra-high Speed Laser Beam Printer", Arimoto et al, CLEOS'80, p. 76, 1980.

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