Photoelectric position measuring system using gratings having sp

Details Photoelectric position measuring system using gratings having sp Photoelectric position measuring system using gratings having sp

1994-07-07

1996-11-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 356375, 33707, 341 13, H01J 314, H01J 4014

Patent

active

055765378

ABSTRACT:
A light source which emits light in strips is provided for illuminating a scale of a photoelectric position measuring system. The light modulated by the scale is converted into a sinusoidal scanning signal by a scanning plate. The scanning plate is a semiconductor substrate structured in strips. The width (A) of the light-emitting areas and the width (B) of the interspersed non-emitting areas of the light source is such that defined harmonics are filtered out of the scanning signal. The scanning plate is of such configuration that further harmonics are suppressed.

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patent: 5155355 (1992-10-01), Kabaya
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