Apparatus for controlling light quantity using acousto-optic mod

Details Apparatus for controlling light quantity using acousto-optic mod Apparatus for controlling light quantity using acousto-optic mod

1994-04-13

1996-11-12

Nelms, David C.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 53, 355 69, G03B 2772

Patent

active

055745377

ABSTRACT:
An apparatus for controlling a light quantity comprises a light source for emitting light and an acousto optical modulating element, having a driving unit for giving a progressive wave to a medium, for generating 0th-order and higher-order diffracted beams of light by an acousto optical effect of the progressive wave. The apparatus also comprises a stop element which transmits, not the higher-order diffracted beams, but the 0th-order diffracted beam; and a drive controlling section for varying a quantity of light irradiating an object by regulating the progressive wave through the driving unit.

REFERENCES:
patent: 4362364 (1982-12-01), Smith
patent: 5067798 (1991-11-01), Tomoyasu
patent: 5191374 (1993-03-01), Hazama et al.

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