Automatic focusing apparatus which adjusts the speed of focusing

Details Automatic focusing apparatus which adjusts the speed of focusing Automatic focusing apparatus which adjusts the speed of focusing

1994-06-16

1998-05-26

Faile, Andrew

Television

Camera, system and detail

Optics

348356, G03B 1300

Patent

active

057574294

ABSTRACT:
An automatic focusing apparatus includes a circuit to generate a focus evaluating value; a control unit for moving a focusing lens position so that the focus evaluating value attains the maximum value; four memories for respectively storing four successive focus evaluating values; and four memories for storing four position data of the focusing lens corresponding to the focus evaluating values. The automatic focusing apparatus further includes a circuit for calculating an amount of change of the focus evaluating value based on the focus evaluating values of the current and second last fields, a circuit for calculating an amount of change of the lens position corresponding thereto, and a circuit for calculating the rate of change of the focus evaluating value based on these amounts of change.

REFERENCES:
patent: 4531158 (1985-07-01), Murakami et al.
patent: 4762986 (1988-08-01), Suda et al.
patent: 4841370 (1989-06-01), Murashima et al.
patent: 4853789 (1989-08-01), Murashima et al.
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4920420 (1990-04-01), Sano et al.
patent: 4922346 (1990-05-01), Hidaka et al.
patent: 5003339 (1991-03-01), Kikuchi et al.
patent: 5005086 (1991-04-01), Iwamoto et al.
patent: 5164756 (1992-11-01), Hirasawa
patent: 5200828 (1993-04-01), Jang et al.
patent: 5249058 (1993-09-01), Murata et al.
patent: 5287223 (1994-02-01), Hirasawa

Affiliated with

Also associated with

Rating

Automatic focusing apparatus which adjusts the speed of focusing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic focusing apparatus which adjusts the speed of focusing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing apparatus which adjusts the speed of focusing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1968220