G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 5/347 (2006.01)
Patent
CA 2298512
The present invention relates to optical reading systems for incremental encoders. An incremental encoder, whether linear or angular, consists of an encoding disc or linear scale with optically transparent and non-transparent or reflecting and non- reflecting patterns, with a light source on one side and photo detectors on the other side. The light source in this invention produces light stripes. These light stripes are adjustable to match the pattern of the encoding element. A photo detector assembly detects the light stripes going through or reflected from the encoding element. Description of the prior art Incremental encoders, in their simplest form, produce electronic pulses with light, encoding elements and photo detectors. An optical mask between the light and the encoding element or between the photo detector and the encoding element enhances the performance of this assembly and makes it possible to read very fine lines. Other known devices for more precise readings use diffraction gratings and measure their relative shifts. These methods are costly because of the necessary time to adjust the optical elements.
Hohner Corp
Kourilovitch Andrei
LandOfFree
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