Automatic focusing system for use in camera

Details Automatic focusing system for use in camera Automatic focusing system for use in camera

1987-02-20

1988-09-13

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350 16, 350166, 350311, 358227, 358906, 358909, 354419, G03B 300, G02B 528, H04N 5781

Patent

active

047713070

ABSTRACT:
An automatic focusing system includes a photo-sensitive element for receiving light passing a main lens system of a camera. The photo-sensitive element produces a distance indicative signal based on the received light. The main lens system is driven to a position to focus upon an object on the basis of the distance indicative signal from the photo-sensitive element. The system is also provided with an auxiliary light generating element for emitting an auxiliary light to the object. The auxiliary light generating element is activated while distance measurement is performed for focusing operation in order to enable the automatic focusing system to perform a distance measurement and focus upon the object even in dark environmental conditions or upon dark objects. The auxiliary light generating element may be selected to emit an infrared light beam or a far infrared light beam.

REFERENCES:
patent: 4229066 (1980-10-01), Rancourt et al.
patent: 4536072 (1985-08-01), Taniguchi et al.
patent: 4549801 (1985-10-01), Winter
patent: 4571047 (1986-02-01), Hirai
patent: 4616902 (1986-10-01), Nagai

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