Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-11-30
1991-10-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
050576860
ABSTRACT:
A reference light transmission window is provided in the vicinity of a sub grating disposed on a usual index scale, and a light transmitted by the reference light transmission window is photoelectrically converted to a reference signal. When a main scale is of an optical transmission type, a light transmitted through a reference light transmission window of a second index scale, which is provided on the opposite side to the usual index scale so as to put the main scale between the second index scale and the usual index scale, or a light among those modulated by the main grating and by the sub grating, which light is not used for displacement detection, is photoelectrically converted to a DC level detection signal. The reference signal or DC level detection signal is used to correct DC level variations of the displacement detection signal.
REFERENCES:
patent: 3427463 (1969-02-01), Weyrauch
patent: 3566136 (1971-02-01), Kamachi
patent: 4318617 (1982-03-01), Orsen
patent: 4678908 (1987-07-01), La Plante
patent: 4680466 (1987-07-01), Kuwahara et al.
patent: 4701615 (1987-10-01), Schmitt
patent: 4861982 (1989-08-01), Smid et al.
patent: 4862396 (1989-08-01), Nirumandrad
Hikawa Norihito
Ishibashi Wataru
Allen S.
Mitutoyo Corporation
Nelms David C.
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