Automatic focusing system

Details Automatic focusing system Automatic focusing system

2005-08-16

2009-08-04

Ho, Tuan V (Department: 2622)

Television

Camera, system and detail

Optics

C348S345000, C348S353000, C348S357000, C396S119000

Reexamination Certificate

active

07570299

ABSTRACT:
An automatic focusing system comprising:a plurality of image pickup surfaces of an AF image pickup device for taking images of a subject for performing automatic focusing of a picture taking lens, the image pickup surfaces being placed at such positions that the length of optical paths to the image pickup surfaces differ from each other;a common optical path which is a portion of an optical path through which subject light entering the picture taking lens are supplied to the plurality of image pickup surfaces, and through which the entire subject light to be incident on the image pickup surfaces passes;a light splitting device which splits the subject light supplied through the common optical path into subject lights respectively incident on the plurality of image pickup surfaces;a focusing control device which controls focusing of the picture taking lens on the basis of contrasts in the subject images obtained through the plurality of image pickup surfaces so that a correct focus on the subject is achieved; anda conversion device which is placed at a predetermined position in the common optical path, and which converts the subject light reaching the predetermined position into non-polarized light if the subject light is polarized light, and makes the converted subject light enter the light splitting device.

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