Incremental photoelectric measuring device

Details Incremental photoelectric measuring device Incremental photoelectric measuring device

1979-06-04

1981-10-27

Punter, William H.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237G, G01B 1114, G01B 1104

Patent

active

042970334

ABSTRACT:
An incremental photoelectric measuring device is described including a measuring scale having a line grid and a scanning plate having a line grid, wherein the grid spacings of the two line grids are unequal such that one is an integral multiple of the other. Preferably the scale is provided with the coarser, less expensive to manufacture, line grid and the scanning plate is provided with the finer line grid. In this case the resolution of the measuring device is governed by the fine line grid of the scanning plate which can readily be changed to alter the resolution of the device. Two preferred separations between the scale and the scanning plate are described, which separations provide refraction doubling of the coarser line grid and enhanced spatial precision, respectively.

REFERENCES:
patent: 3166624 (1965-01-01), Vargady
patent: 3427463 (1969-02-01), Weyrauch
patent: 3796498 (1974-03-01), Post
patent: 3812352 (1974-05-01), MacGovern
patent: 3842261 (1974-10-01), MacGovern et al.
Machine Shop Magazine, 4-62, pp. 208-209.
Zverev, A. E., Translation of USSR Inventors Certificate #127552.

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