JPH0175208U

JPH0175208U -

Info

Publication number: JPH0175208U
Application number: JP1987170048U
Authority: JP
Priority date: 1987-11-09
Filing date: 1987-11-09
Publication date: 1989-05-22

Description

[Brief explanation of the drawing]

第１図および第２図は、いずれも本考案に係る
測距用補助光投射装置の第１実施例を示し、第１
図は全体構成を示す縦断側面図、第２図は、第１
図の要部の構成を拡大して示す縦断側面図、第３
図および第４図は、それぞれ本考案の第２実施例
および第３実施例の要部の構成を示す縦断側面図
、第５図および第６図は、従来例を示す斜視図で
ある。ＬＥＤ１，ＬＥＤ２……光源、１，８……発光
面、１ａ，１ｂ，７ａ……発光面像、１ｃ……垂
直２等分線、２……反射鏡部、２ａ，２ｂ，７…
…球面反射鏡、３……投射レンズ、３ａ……下側
瞳、３ｂ……上側瞳、３ｃ……光軸、４ａ，４ｂ
……入射光、５ａ……球面反射鏡２ａの中心、５
ｂ……球面反射鏡２ｂの中心、５ｃ……中心５ａ
を通る中心線、５ｄ……中心５ｂを通る中心線、
Ｌａ１〜Ｌａ４，Ｌｂ１〜Ｌｂ４，ＬＣ１〜ＬＣ
２……光線、ｄ……ＬＥＤ１の厚さ、ｈ……ＬＥ
Ｄ１の高さ。 1 and 2 both show a first embodiment of the distance measuring auxiliary light projection device according to the present invention.
The figure is a vertical side view showing the overall configuration, and Figure 2 is the first
Vertical side view showing an enlarged view of the configuration of the main parts of the figure, No. 3
4 and 4 are longitudinal sectional side views showing the configuration of essential parts of the second and third embodiments of the present invention, respectively, and FIGS. 5 and 6 are perspective views showing the conventional example. LED1, LED2...Light source, 1,8...Light emitting surface, 1a, 1b, 7a...Light emitting surface image, 1c...Perpendicular bisector, 2...Reflector portion, 2a, 2b, 7...
... Spherical reflector, 3 ... Projection lens, 3a ... Lower pupil, 3b ... Upper pupil, 3c ... Optical axis, 4a, 4b
...Incoming light, 5a ... Center of spherical reflecting mirror 2a, 5
b...center of spherical reflecting mirror 2b, 5c...center 5a
A center line passing through the center, 5d... A center line passing through the center 5b,
La1~La4, Lb1~Lb4, LC1~LC
2...Light ray, d...Thickness of LED1, h...LE
Height of D1.

Claims

[Scope of utility model registration request]

In order to maintain the distance measurement accuracy of an autofocus camera that uses a phase difference detection method when the subject brightness is low, etc., a distance measurement auxiliary light projection device that illuminates the subject is placed near the optical axis of the projection lens. a light source with a light emitting surface facing in a direction opposite to the side where the projection lens is located; and two concave mirrors disposed on the light emitting surface side of the light source and having their ends connected to each other with concave surfaces facing the light emitting surface side. and is configured to illuminate the subject by projecting two images of the light emitting surface formed in a space near the light source by the respective concave mirrors onto the subject by the projection lens. An auxiliary light projection device for ranging.