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LIGHT SOURCE ARRAY USED IN AN ILLUMINATION PORTION OF AN OPTICAL ENCODER | LICHTQUELLENARRAY IN EINEM BELEUCHTUNGSABSCHNITT EINES OPTISCHEN CODIERERS | RÉSEAU DE SOURCE DE LUMIÈRE UTILISÉ DANS UNE PARTIE D'ÉCLAIRAGE D'UN CODEUR OPTIQUE

Patentnummer:EP3098572B1
IPC Hauptklasse:G01D000538
Anmelder:Mitutoyo Corporation (0)
20-1, Sakado 1-chome, ; Takatsu-ku, ; Kawasaki, Kanagawa 213-0012, JP
Erfinder:Kapner, Daniel John (0)
3554 NE 92nd Street, Seattle, WA 98115, US
Anmeldung:18.05.16
Offenlegung:19.05.15
Patenterteilung:21.03.18

Abstract / Hauptanspruch
A light source array (265) used in illumination portions for optical encoders comprising an illumination portion (260), a scale grating (210) extending along a measuring direction (82) and receiving light (231) from the illumination portion (260), and a detector configuration (225). The light source array (225) comprises individual sources (265n) arranged in a grid pattern and coinciding with two transverse sets of parallel grid pattern lines (GPL1, GPL2) that have two different grid line pitches (P1, P2) between their parallel lines. Different instances of the light source array (265) may be mounted with different rotational orientations about an axis normal to the grid pattern, for use in different illumination portions adapted for use with respective scale gratings (210) having different grating pitches (SGP1, SGP2) along the measuring axis direction. By using the different respective rotational orientations, the individual sources (265n) are aligned along respective illumination source lines (ISL1, ISL2) that are spaced apart by different respective illumination source line pitches (IP1, IP2) along the measuring axis direction (82).

EP3098572B1


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