Optical encoders
Номер патента: CA2025806A1
Опубликовано: 22-03-1991
Автор(ы): Robert M. Taylor
Принадлежит: SMITHS GROUP PLC
Опубликовано: 22-03-1991
Автор(ы): Robert M. Taylor
Принадлежит: SMITHS GROUP PLC
Реферат: ABSTRACT OF THE DISCLOSURE Conventional optical encoders have an optically-encoded plate with parallel tracks each comprising alternate opaque and transparent regions which differ in length between the tracks. LED's direct radiation onto the upper surface of the plate and detectors located below the plate provide an output in response to radiation transmitted through the transparent regions. In the present invention, the opaque regions are reflective and the encoder includes detectors mounted above the plate with provide normally complementary outputs in response to radiation reflected from the reflective regions. A processor detects any loss of complementarity and determines the position of the plate close to the boundary between adjacent regions by comparing the detector outputs as one falls and the other rises.
Optical encoder having a positioning device with light penetrating areas disposed between a light emitting module and a light separating structure
Номер патента: US09488502B2. Автор: Ming-Chieh Chou,Yi-Cheng Chen,Ching-Chang Chen. Владелец: Industrial Technology Research Institute ITRI. Дата публикации: 2016-11-08.