JPS6429737U

JPS6429737U -

Info

Publication number: JPS6429737U
Application number: JP12376287U
Authority: JP
Priority date: 1987-08-14
Filing date: 1987-08-14
Publication date: 1989-02-22

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例に係る光リミツト
スイツチの要部分解斜視図、第２図は同組立状態
の平面図、第３図は同組立状態におけるハウジン
グの一部を破断した側面図、第４図はフアイバホ
ルダの断面図、第５図は第４図の―線断面図
、第６図は作用説明図、第７図は遮蔽板の配置位
置の変形例を示す概略図、第８図、第９図はプリ
ズムの他の実施例を示す平面図、第１０図は従来
の光リミツトスイツチを示す概略構成図である。図において、３は送光用フアイバ、４は受光用
フアイバ、５はプリズム、５０は溝部、５１は送
光側反射面、５２は受光側反射面、６は遮蔽板で
ある。 FIG. 1 is an exploded perspective view of essential parts of an optical limit switch according to an embodiment of the invention, FIG. 2 is a plan view of the same assembled state, and FIG. 3 is a partially cutaway side view of the housing in the same assembled state. FIG. 4 is a sectional view of the fiber holder, FIG. 5 is a sectional view taken along the line -- in FIG. 4, FIG. 6 is an explanatory diagram of the operation, FIG. 9 are plan views showing other embodiments of the prism, and FIG. 10 is a schematic configuration diagram showing a conventional optical limit switch. In the figure, 3 is a light transmitting fiber, 4 is a light receiving fiber, 5 is a prism, 50 is a groove, 51 is a reflective surface on the light transmitting side, 52 is a reflective surface on the light receiving side, and 6 is a shielding plate.

Claims

[Scope of Claim for Utility Model Registration] (1) In an optical limit switch in which a shielding plate is used to open and close an optical signal from the light transmitting fiber between a light transmitting fiber and a light receiving fiber, the light transmission of the light transmitting fiber is A light transmitting side reflective surface located in front of the end and a light receiving side reflective surface located in front of the light receiving end of the light receiving fiber which reflects and directs the reflected light from the light transmitting side reflective surface to the light receiving fiber are integrated. a prism having a prism, and a plate spring member that is movable between a closed position where the optical signal from the light transmitting fiber is blocked and an open position where the optical signal is not blocked, and has an elastic restoring force to either one of the closed positions. 1. An optical limit switch comprising: a shielding plate integrally formed with the prism; and a groove provided in the prism perpendicularly to the optical signal path so that the shielding plate moves in and out. (2) The optical limit switch according to claim 1, wherein the prism has a light transmitting side reflective surface and a light receiving side reflective surface each formed in a lens shape. (3) The prism is characterized in that a hole into which the light transmitting end of the light transmitting fiber and the light receiving end of the light receiving fiber are inserted is provided on the same plane, and the bottom of the hole is formed into a lens shape. Scope of claim for utility model registration No. 1
Optical limit switch described in section.