| 摘要 |
Disclosed is a photoelectric incident light distance measuring device, comprising a light source; a reflecting scale grating; a reference grating with a lattice constant differing from that of the scale grating; the reference grating being transparent and displaceable with respect to the scale grating; an air space between the two gratings; and a plurality of photoelectric receivers placed at intervals in the direction of the distance to be measured for scanning the scale grating through the reference grating whereby vernier strips are produced, and wherein at least two of the photoelectric receivers are arranged approximately at a distance "x", measured in the direction of the light, from the grating with the larger optically effective lattice constant, wherein: x=a/v with a=optically effective air space between the reference and scale gratings; v=dM/(y+dM)=distortion factor; y=distance of the vernier strips produced by the two gratings; and with dM as the optically effective lattice constant of the scale grating, related to the optically effective lattice constant dR of the reference grating by the relationship dR=dM (1+/-v).
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