Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1992-03-31

1993-05-04

Gellner, Michael L.

354407, 354412, G03B 300, G03B 700

Patent

active

052086259

ABSTRACT:
An automatic focusing apparatus detects movement of an object image by a phase difference method so as to perform a predicted AF operation and a focusing operation by detecting an object image moving in a lateral direction perpendicular to the optical axis, thereby reliably focusing on a specific object. In the automatic focusing apparatus, light from an object is split into two light beams by first and second photoelectric transducer arrays, and the two light beams are converted into first and second object image signals. An object image moving amount calculation section calculates the moving amounts of first and second object images on the basis of first and second object image positions on the first and second photoelectric transducer arrays, and the first and second object image positions after an elapse of a first predetermined period of time. Based on the calculation outputs, an object image position prediction calculation section calculates first and second object image positions after an elapse of a second predetermined period of time following the first predetermined period of time. Based on the predicted first and second object image positions, a lens driving amount calculation section calculates a necessary lens driving amount, thus predicting movement of an object.

REFERENCES:
patent: 4492448 (1985-01-01), Ishikawa et al.
patent: 4816856 (1989-03-01), Hamada et al.
patent: 4860045 (1989-08-01), Hamada et al.
patent: 5005039 (1991-04-01), Hamada et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1978295