JPH0312119U

JPH0312119U -

Info

Publication number: JPH0312119U
Application number: JP7238189U
Authority: JP
Priority date: 1989-06-22
Filing date: 1989-06-22
Publication date: 1991-02-07

Description

[Brief explanation of drawings]

第１図は本考案に係る光透過型ロータリーエン
コーダを示す斜視図、第２図はその−線断面
図、第３図及び第４図は従来の光透過型ロータリ
ーエンコーダを示す斜視図である。符号の説明、１…パルススケール、２…スリツ
ト（透光部）、３…回転軸、４…ホトセンサ、５
…ハウジング、６…発光用光フアイバ、６ａ…発
光用光フアイバの端面、７…受光用光フアイバ、
７ａ…受光用光フアイバの端面、８…光フアイバ
ケーブル。 FIG. 1 is a perspective view showing a light transmission type rotary encoder according to the present invention, FIG. 2 is a sectional view taken along the line 2, and FIGS. 3 and 4 are perspective views showing a conventional light transmission type rotary encoder. Explanation of symbols, 1... Pulse scale, 2... Slit (transparent part), 3... Rotation axis, 4... Photo sensor, 5
... Housing, 6... Optical fiber for light emission, 6a... End face of optical fiber for light emission, 7... Optical fiber for light reception,
7a... End face of optical fiber for light reception, 8... Optical fiber cable.

Claims

[Claims for Utility Model Registration] (1) By rotating the pulse scale 1 in which the transparent parts 2 forming the code pattern C along the circumferential direction are formed at predetermined intervals, the light transmitted through the transparent parts 2 is In a light transmission type rotary encoder configured to output a light pulse signal intermittently according to its rotation angle, a light emitting device for irradiating light onto a light transmission portion 2 from both sides of the pulse scale 1. The end face 6a of the optical fiber 6 and the end face of the light-receiving optical fiber 7 that receives the light transmitted from the light-transmitting portion 2 are arranged to face each other, and in this state, both the optical fibers 6, 7
is integrally attached and fixed to the housing 5, the light-emitting optical fiber 6 is selected to be an optical fiber with a small diameter and a low numerical aperture NA, and the light-receiving optical fiber 7 is selected to be an optical fiber having a small diameter and a low numerical aperture NA. A light transmission type rotary encoder characterized in that a fiber with a large diameter and a high numerical aperture NA is selected. (2) A plastic fiber is used for at least one of the light emitting optical fiber 6 and the light receiving optical fiber 7, and the plastic fiber is bent and wired in the same direction as the wiring direction of the other optical fiber. The light transmission type rotary encoder according to claim 1 of the utility model registration claim.