| 摘要 |
PCT No. PCT/FR79/00093 Sec. 371 Date Jun. 16, 1980 Sec. 102(e) Date Jun. 16, 1980 PCT Filed Oct. 15, 1979 PCT Pub. No. WO80/00873 PCT Pub. Date May 1, 1980. Displacements of a moving stem are measured by an optoelectronic high precision dimension and displacement measuring sensor. The stem slides in a body on two guides carried by the body. Two adjacent photoreceivers symmetrically positioned on either side of the stem axis are responsive to an optical source. A cover carried by the moving stem is situated between the source and the photoreceivers. The cover includes transparent and opaque parts so the cover movement increases and decreases the areas of the two photoreceivers exposed to the light source. The cover is substantially symmetrical with the contact tip at the stem end relative to the center point between the two guides, whereby mechanical play of the stem in the guides causes the illumination of the photoreceivers to be virtually the same.
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