JPH0459832U

JPH0459832U -

Info

Publication number: JPH0459832U
Application number: JP10188590U
Authority: JP
Priority date: 1990-09-28
Filing date: 1990-09-28
Publication date: 1992-05-22

Description

[Brief explanation of the drawing]

第１図Ａ，Ｂは、本考案の第１実施例を示す測
距用投光装置における発光素子のチツプの発光面
である正面図とチツプの下側面図、第２図は、本
考案の第２実施例を示す投光装置における発光素
子のチツプの発光面の正面図、第３図Ａ，Ｂは、
カメラ内に配設された投光装置と自動焦点検出装
置の概略を示す構成図であつて、第３図Ａはカメ
ラの平面図、第３図Ｂはカメラの側面図、第４図
は、上記投光装置の拡大断面図、第５図は、上記
自動焦点検出装置の詳細な構成図、第６図は、投
影パターン像と測距範囲との関係を示す線図、第
７図および第８図は、横軸に自動焦点検出装置に
おける各測距用素子群の出力を、縦軸に測距され
た被写体部分の光強度をそれぞれとつたグラフ線
図、第９図は、ラインチヤートのような被写体の
一例を示す線図、第１０図は、上記第９図の被写
体を自動焦点検出装置によつて測距した場合のコ
ントラスト出力を示す線図、第１１図は、投影像
の一例を示す線図、第１２図Ａ〜Ｄは、測距距離
によつて変化する測距出力をそれぞれ示すグラフ
線図である。１，１Ａ，１Ｂ……チツプ、１ａ，１ｂ……発
光面、２……発光ダイオード、３……発光素子、
４，４Ａ，４Ｂ……電極、５……通電用ボンデイ
ングワイヤー、１１……投光装置、１２……自動
焦点検出装置、２６……投影パターン、Ｏ_１……
投光光学系の光軸、Ｏ_２……受光光学系の光軸。 1A and 1B are a front view and a bottom view of the light-emitting surface of a chip of a light-emitting element in a rangefinding floodlight device showing a first embodiment of the present invention, and FIG. 2 is a bottom view of the chip. FIGS. 3A and 3B are front views of the light emitting surface of the chip of the light emitting element in the light projecting device showing the second embodiment.
FIG. 3A is a plan view of the camera, FIG. 3B is a side view of the camera, and FIG. FIG. 5 is a detailed configuration diagram of the automatic focus detection device, FIG. 6 is a diagram showing the relationship between the projected pattern image and the distance measurement range, and FIGS. Figure 8 is a graph diagram in which the horizontal axis represents the output of each range-finding element group in the automatic focus detection device, and the vertical axis represents the light intensity of the distance-measured object part, and Figure 9 shows the line chart. FIG. 10 is a diagram showing an example of a subject as shown in FIG. 9, and FIG. 11 is a diagram showing a contrast output when the subject shown in FIG. FIGS. 12A to 12D are graph diagrams each showing distance measurement outputs that change depending on the distance measurement distance. 1, 1A, 1B... Chip, 1a, 1b... Light emitting surface, 2... Light emitting diode, 3... Light emitting element,
4, 4A, 4B...electrode, 5...bonding wire for current supply, 11...light projector, 12...automatic focus detection device, 26...projection pattern, O ₁ ...
Optical axis of the light emitting optical system, O ₂ ...optical axis of the light receiving optical system.

Claims

[Scope of Claim for Utility Model Registration] A light projection device having a light emitting element that projects a projection pattern for distance measurement toward a subject, and an automatic focus detection device that detects focus by receiving reflected light from the subject. In a light projection type autofocus device in which the optical axis of the light projection optical system of the light projection device and the optical axis of the light receiving optical system of the automatic focus detection device have parallax, the light emitting surface of the light emitting element forms A projection pattern is formed with a contrast of brightness between a light emitting surface and an electrode on the light emitting surface, and the electrode is brought close to the range of the projected pattern that is detected when measuring a long distance object. A distance measuring light projecting device characterized by being arranged in a staggered manner.