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1. WO1990007693 - SLIT ARRANGEMENT STRUCTURE OF A FIXED SLIT PLATE IN A PULSE ENCODER

Publication Number WO/1990/007693
Publication Date 12.07.1990
International Application No. PCT/JP1989/001303
International Filing Date 26.12.1989
IPC
G01D 5/36 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
26using optical means, i.e. using infra-red, visible or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
36Forming the light into pulses
CPC
G01D 5/36
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
26characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
32with attenuation or whole or partial obturation of beams of light
34the beams of light being detected by photocells
36Forming the light into pulses
Applicants
  • FANUC LTD [JP]/[JP] (AllExceptUS)
  • ASABA, Eiki [JP]/[JP] (UsOnly)
  • TANABE, Yoshihito [JP]/[JP] (UsOnly)
  • TAGAMI, Kiyoshi [JP]/[JP] (UsOnly)
Inventors
  • ASABA, Eiki
  • TANABE, Yoshihito
  • TAGAMI, Kiyoshi
Agents
  • AOKI, Akira
Priority Data
63/32911728.12.1988JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) SLIT ARRANGEMENT STRUCTURE OF A FIXED SLIT PLATE IN A PULSE ENCODER
(FR) AGENCEMENT DES FENTES D'UNE PLAQUE A FENTES FIXE DANS UN CODEUR D'IMPULSIONS
Abstract
(EN)
If a pulse encoder having a plurality of absolute-type slits (24, 26, 28, 30) and a plurality of increment-type slit groups (14, 16, 18, 20) has a structure wherein the shape of each increment-type slit group is rectangular, it is impossible to irradiate both of these groups and the absolute-type slits with one light-emitting element (46). To solve this problem in this invention, the increment-type slit groups are formed each in a sectorial shape and are radially arranged about the optical axis (13) of the light-emitting element (46). It becomes thus possible to arrange the absolute-type slits (24, 26, 28, 30) in the remainder of a region (12) irradiated with the one light-emitting element (46) and, hence, to provide a pulse encoder which is compact at a low cost.
(FR)
Lorsqu'un codeur d'impulsions comportant un ensemble de fentes de type absolu (24, 26, 28, 30) et un ensemble de groupes de fentes de type incrémentiel (14, 16, 18, 20) présente une structure dans laquelle la forme de chaque groupe de fentes de type incrémentiel est rectangulaire, il est impossible d'irradier lesdits groupes et les fentes de type absolu avec un seul élément photoémetteur (46). Afin de résoudre ce problème, on donne à chaque groupe de fentes de type incrémentiel une forme de secteur et on les dispose radialement autour de l'axe optique (13) de l'élément photoémetteur (46). Cet agencement permet de placer les fentes de type absolu (24, 26, 28, 30) dans la partie résiduelle d'une région (12) irradiée par l'élément photoémetteur (46) et, par conséquent, de produire un codeur d'impulsions économique et de faibles dimensions.
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