Automatic focusing system

Details Automatic focusing system Automatic focusing system

1989-05-15

1990-02-20

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354402, H04N 5232

Patent

active

049031350

ABSTRACT:
An automatic focusing apparatus having a focusing lens system and an image pickup device for converting a light beam incident thereon into the corresponding electrical signal. The automatic focusing apparatus is arranged so that focusing is performed in accordance with the focus voltage obtained from a predetermined high-frequency component of the electrical signal, on the basis of the fact that the level of the focus voltage corresponds to the sharpness of the resultant image. The focus voltage is successively compared with each of a plurality of reference voltages predetermined to be increased in steps. The focusing lens system is controlled in position in accordance with a comparison between the first reference voltage agreeing with one of the focus voltages and the second reference voltage agreeing with another focus voltage so that the focusing lens system approaches the focus position. When the first and second reference voltages are equal in level to each other, the focusing lens system is controlled to take the middle point between the position corresponding to the first and second reference voltages.

REFERENCES:
patent: 4609944 (1986-09-01), Nakada et al.
patent: 4621292 (1986-11-01), Hirao et al.
patent: 4706124 (1987-11-01), Baba et al.
patent: 4717959 (1988-01-01), Isago
patent: 4762986 (1988-08-01), Suda et al.
IEEE Transactions on Consumer Electronics, vol. CE-29, No. 3, Aug. 1983, pp. 376-382, IEEE, New York, U.S.; K. Hanma et al.: "Novel Technologies for Automatic Focusing and White Balancing of Solid State Color Video Camera".

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