Single channel encoder

Details Single channel encoder Single channel encoder

G - Physics

01

D

340/136.3

G01D 5/245 (2006.01) G01D 5/34 (2006.01) G01D 5/347 (2006.01) G01D 15/24 (2006.01)

Patent

CA 1301281

Abstract The single channel encoder comprises a transparent scale in which the scale divisions are defined by transverse opaque lines having a width greater than the width between the opaque lines. An emitter holder and a detector holder snap together clamping an aperture plate there between. The aperture plate has a slit therein which is disposed in the optical path between the emitter and the detector. Projec- tions functioning as scale supports on the opposite sides of the emitter holder and the detector holder are disposed in longitudinally spaced positions and define a gap there- between for engaging the outside edges of the encoder scale outside of the opaque transverse lines to precisely position the tape in the optical path for maintaining a constant gap between the encoder scale and the aperture plate.

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