Photoelectric incremental length or angle measuring device

Details Photoelectric incremental length or angle measuring device Photoelectric incremental length or angle measuring device

1982-11-19

1985-05-28

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356375, 356383, 250237G, 33125A, 33125C, G01B 1100, G01B 1102

Patent

active

045197091

ABSTRACT:
A photoelectric incremental length or angle measuring device capable of alternate embodiments using transillumination or reflected-light arrangements and having a scanning grid slidable with respect to a spaced measuring scale grid. The ratio of the widths of the photopermeable to the photoimpermeable lines of the scanning grid of such a device is changed from the conventional ratio of 1:1 to a higher ratio which is greater than 2:1, preferably 3:1, while the ratio for these areas of the measurement division grid remains at 1:1. This change of the scanning grid ratio acts to increase the range of acceptable scanning distances.

REFERENCES:
patent: 3166624 (1965-01-01), Vargady
patent: 3812352 (1974-05-01), MacGovern
patent: 4297033 (1981-10-01), Nelle

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