JPH0325106U

JPH0325106U -

Info

Publication number: JPH0325106U
Application number: JP8614189U
Authority: JP
Priority date: 1989-07-21
Filing date: 1989-07-21
Publication date: 1991-03-14

Description

[Brief explanation of the drawing]

第１図ＡおよびＢは、本考案に係る測距装置の
受光部の第１実施例を示す概略構成図およびその
正面図、第２図ＡおよびＢは、本考案に係る第２
実施例を示す概略構成図およびその正面図、第３
図は、上記第２図に示した第２実施例に用いられ
る遮光フイルタの透過率を示す光学特性図、第４
図は、上記第２図の第２実施例における信号光の
入射特性図、第５図Ａ〜Ｄは、本考案に係る第３
実施例を示す概略構成図、正面図および絞り作用
の説明図、第６図は、赤外線投光アクテイブ式測
距法を用いたカメラ用測距装置の原理を説明する
ための概略構成図、第７図は、受光素子上におけ
る信号光の入射位置を説明するための斜視模式図
、第８図は、上記第６図のカメラ用測距装置にお
ける信号光強度と被写体距離との関係を示す相関
図、第９図は、上記第６図のカメラ用測距装置に
おける受光素子上での信号光の入射位置と信号光
強度ＰＯとの関係を示す相関図、第１０図は、外
光ノイズと入射位置との関係を示す線図、第１１
図は、カメラ用オートフオーカス装置に用いられ
ている一般的な赤外線投光アクテイブ式測距装置
の電気回路の構成図である。ｓ……基線長、θ……傾き角θ、ｆ……受光用
レンズ系の焦点距離、Ｉａ，Ｉｂ……電流信号、
……被写体距離、Ｐ……被測定物、Ｂ……信号
光、ｘ……入射位置、１……投光レンズ、２……
受光レンズ、３……赤外線発光ダイオード、４…
…受光素子、１０……ＡＦ回路、２１……ＰＳＤ
、６０……遮光マスク、６１……遮光フイルタ、
６２……絞り部材。 1A and B are schematic configuration diagrams and front views thereof showing a first embodiment of a light receiving section of a distance measuring device according to the present invention, and FIGS. 2A and B are a
Schematic configuration diagram and front view thereof showing an example, Part 3
The figure is an optical characteristic diagram showing the transmittance of the light shielding filter used in the second embodiment shown in FIG.
The figure shows the incident characteristic diagram of the signal light in the second embodiment shown in FIG. 2, and FIGS.
A schematic configuration diagram showing an embodiment, a front view and an explanatory diagram of the aperture effect, and FIG. FIG. 7 is a schematic perspective view for explaining the incident position of the signal light on the light receiving element, and FIG. 8 is a correlation showing the relationship between the signal light intensity and the subject distance in the camera distance measuring device shown in FIG. 6 above. 9 is a correlation diagram showing the relationship between the incident position of the signal light on the light receiving element and the signal light intensity PO in the camera distance measuring device shown in FIG. 6, and FIG. Diagram showing the relationship with the incident position, 11th
The figure is a configuration diagram of an electric circuit of a general infrared emitting active type distance measuring device used in an autofocus device for a camera. s... Base line length, θ... Tilt angle θ, f... Focal length of light receiving lens system, Ia, Ib... Current signal,
...Subject distance, P...Object to be measured, B...Signal light, x...Incidence position, 1...Light projection lens, 2...
Light receiving lens, 3... Infrared light emitting diode, 4...
...Photodetector, 10...AF circuit, 21...PSD
, 60... light-shielding mask, 61... light-shielding filter,
62...Aperture member.

Claims

[Claim for Utility Model Registration] Projecting a beam of light such as infrared rays onto an object to be measured, and receiving signal light reflected from the object through a receiving lens placed at a predetermined distance onto a light-receiving element. In a distance measuring device that measures the distance to an object based on the incident position of the signal light on the light receiving element, the light that is incident on the light receiving surface on the short distance side of the light receiving element is reduced. A distance measuring device characterized in that it is equipped with a mask, a filter, an aperture, etc. to reduce the intensity of external light components.