Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-06-15
1985-01-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340347P, G01D 534
Patent
active
044968353
ABSTRACT:
An optical transducer for detecting the angular position of a rotary member with respect to a fixed structure comprises a disc 13 mounted rotatably within a casing. The disc is provided with a plurality of opaque radial regions 19 which are spaced by transparent regions 18 which transmit the light emitted by a light source mounted on the casing. The light is received by a photodetector element 25 comprising a support plate 28 on which is disposed a multiplicity of photovoltaic cells 26 each having an area which is fraction of the area of each transparent region of the disc. The cells are subdivided into the groups A, B and C with different functions and phase positions and are distributed diffusely over the area encountered by the beam of light from the light source. The cells of each group are connected together in parallel to generate three electrical signals, one of which provides pilot control for the feed to the light source to stabilize the signals of the other two groups of photoelectric cells.
REFERENCES:
patent: 3549897 (1970-12-01), Blake
patent: 4319134 (1982-03-01), Weber
Boella Marcello
Rivera Paolo
Brophy J.
Ing. C. Olivetti & C. S.p.A.
Nelms David C.
LandOfFree
Shaft encoder with diffusely placed light sensitive elements does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Shaft encoder with diffusely placed light sensitive elements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shaft encoder with diffusely placed light sensitive elements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-508151