Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-10-27
1983-08-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
315 88, 362 20, 362339, 356375, H01J 4014, F21V 1904
Patent
active
043993583
ABSTRACT:
A photoelectric measuring apparatus includes a measuring scale and a scanning unit including at least one photosensitive element for generating a scanning signal in response to light incident on the scanned region of the scale. First and second light sources are included, as well as a mechanism for selecting either of the first and second light sources such that light from the selected light sources is directed at the scanned region of the scale. A slider mechanism, a turntable, a movable mirror, or a movable prism can be used to select either the first or second light sources. In addition, a circuit is disclosed which provides separate first and second balancing circuits for the respective light sources, such that rebalancing the measuring instrument is not required when the selecting mechanism is used to select a different light source.
REFERENCES:
patent: 2557531 (1951-06-01), Blanchet
patent: 3577173 (1971-05-01), Blomgren
patent: 3678286 (1972-07-01), Willis
patent: 4061911 (1977-12-01), Krasin
patent: 4078173 (1978-03-01), Fultz
Burkhardt Horst
Kober Hans-Rudolf
Dr. Johannes Heidenhain GmbH
Nelms David C.
Westin Edward P.
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