JPS6070821U

JPS6070821U - Focus detection device

Info

Publication number: JPS6070821U
Application number: JP16371783U
Authority: JP
Inventors: 進松村
Original assignee: キヤノン株式会社
Priority date: 1983-10-22
Filing date: 1983-10-22
Publication date: 1985-05-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の合焦検出装置を示す光学的構成図、第２
図、第３図はそれぞれ本考案に係る合焦検出装置の第１
、第２の実施例を示す光学的構成図である。符号１，１３は光源、３ａ、３ｂはミラー、４．１０は
撮影レンズ、５，１７はセンサ、６゜１１は光学フィル
タ、６ａは１７４波長板、６ｂは透明平板、７は偏光手
段、８，１４は偏光選択　゛手段、１２は１／２波長板
である。Figure 1 is an optical configuration diagram showing a conventional focus detection device;
Fig. 3 shows the first focus detection device according to the present invention, respectively.
FIG. 2 is an optical configuration diagram showing a second embodiment. 1 and 13 are light sources, 3a and 3b are mirrors, 4.10 are photographing lenses, 5 and 17 are sensors, 6.11 are optical filters, 6a is a 174 wavelength plate, 6b is a transparent flat plate, 7 is a polarizing means, 8 , 14 are polarization selection means, and 12 is a 1/2 wavelength plate.

Claims

[Claims for Utility Model Registration] 1 Projection light from a light projection system is projected onto a subject through a part of the photographic optical system, and reflected light from the subject is passed through another region of the photographic optical system to a photoelectric conversion means. A focus detection device that guides the light to a light receiving system including a light receiving system to determine a focus state of the photographing optical system, the light projecting system including a polarizing means for converting the projected light into linearly polarized light having a polarization axis in a first direction. A focus detection device, characterized in that the light receiving system has a polarization selection means that transmits only polarized light in a second direction perpendicular to the first direction. 2. Filter means for converting the polarized light from the light projecting system into circularly polarized light or into polarized light in the second direction, near a part of the area through which the light reflected from the photographing optical system to the subject passes. A focus detection device according to claim 1 of the utility model registration claim, which is provided with: 3. The focus detection device according to claim 1, which uses a semiconductor light source that emits only polarized light having a polarization axis in the first direction as a polarizing means of the light projecting system. .