Multispot autofocus system having a radiation emitter which emit

Details Multispot autofocus system having a radiation emitter which emit Multispot autofocus system having a radiation emitter which emit

1994-07-19

1996-10-29

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

396111, G01J 120

Patent

active

055699049

ABSTRACT:
A multispot autofocus system, usable with a camera, includes a radiation emitter for emitting visible or infrared radiation. The radiation is divided into at least three discrete beams of radiation by one or more holographic and/or diffractive optical elements. The beams of radiation are directed to different areas of a scene to be recorded. An amount of radiation reflected from the scene is measured. A correct focus position of an optical system of the camera is determined based on the amount of radiation reflected from the scene which is measured.

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