公开(公告)号：US07515818B2

公开(公告)日：2009-04-07

申请号：US11262066

申请日：2005-10-27

Applicant: Masafumi Kimura

Inventor： Masafumi Kimura

IPC: G02B7/28 ,  G02B7/099

CPC classification number: G02B7/28

Abstract: This invention provides an image capturing apparatus which sets the spectral characteristics of a split light beam to be substantially equal to those of straight traveling light upon splitting a light beam coming from a photographing optical system and enables an autofocus detection function by the split light with a sufficient light amount. A digital camera includes a photographing optical system, beam splitter, focus detection sensor, polarizing filter, and CMOS sensor. The beam splitter splits a light beam which travels toward the CMOS sensor that receives an object image formed by the photographing optical system, depending on the direction of polarization, and the focus detection sensor performs focus detection based on the light beam split by the beam splitter. The polarizing filter removes substantially the same polarized light component as a polarized light component that travels toward the focus detection sensor as a result of splitting by the beam splitter.

Abstract translation: 本发明提供一种图像拍摄装置，其在分割来自拍摄光学系统的光束时将分割光束的光谱特性设置为与直线行进光的光谱特性基本相同，并且能够通过分离光进行自动聚焦检测功能 足够的光量。 数码相机包括拍摄光学系统，分束器，焦点检测传感器，偏振滤光器和CMOS传感器。 分束器根据偏振方向分离朝向CMOS传感器行进的光束，其接收由摄影光学系统形成的物体图像，并且焦点检测传感器基于由分束器分割的光束进行焦点检测 。 由于分束器分裂，偏振滤光器去除与偏振光分量基本相同的偏振光分量，该偏振光分量向着焦点检测传感器行进。