Light amount controlling apparatus and method for projector

Details Light amount controlling apparatus and method for projector Light amount controlling apparatus and method for projector

1995-09-22

1997-08-19

Dowling, William

Optics: image projectors

Lamp control

353101, G03B 2114

Patent

active

056580622

ABSTRACT:
A light amount controlling apparatus includes a light source for producing light and a light source driver for driving the light source. A zoom lens unit includes a zoom lens for varying an angle of projection of the light, and a zoom lens position detector detects a position of the zoom lens. A memory stores control data corresponding to the position of the zoom lens and a memory controller reads the control data from the memory according to a detected value of the zoom lens position of the zoom lens position detector. A controller controls the light source driver to vary an amount of light projected from the light source in accordance with the control data output from the memory controller.

REFERENCES:
patent: 3833297 (1974-09-01), Swartz
patent: 4278334 (1981-07-01), Maeda
patent: 4964719 (1990-10-01), Tachikawa et al.
patent: 5136397 (1992-08-01), Miyashita
patent: 5315334 (1994-05-01), Inana

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