Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-08-25
1989-06-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 350 65, 356384, H01J 314
Patent
active
048374326
ABSTRACT:
There is disclosed an optical measuring apparatus including a light scanning section for converting a light beam from a first light source to a parallel scanning light beam, a focussing section including a first focussing lens for focussing the parallel scanning light beam, an electric signal generating section for converting a focussed light to an electric signal, a measuring reference signal generating section and an electric signal processing section.
The light scanning light section comprises a first mirror and a second mirror, each of which is rotated synchronously. The measuring reference comprises a transparent scale which is rotated in synchronism with the first and second mirrors, a light source, a second focussing lens and a second photoelectric conversion element. The electric signal processing section processes the electric signal from the electric signal generating section based on the measuring reference signal.
REFERENCES:
patent: 4402609 (1983-09-01), Fetzer et al.
patent: 4465937 (1984-08-01), Forbes
patent: 4596919 (1986-06-01), Kremers et al.
patent: 4648718 (1987-03-01), Sadamitsu et al.
patent: 4692629 (1987-09-01), Nakamura
Allen Stephone B.
Nelms David C.
Union Tool Co., Ltd.
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