Measuring instrument
US4399612A · kind A · utility
Inventor
Key dates
| Filing date | Jun 24, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Jun 24, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D9/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring instrument in the form of a plotter has a part-reflecting mirror device and a measuring mark or index which may be moved in X, Y and Z directions into coincidence with an image produced by the mirror device of an object to be plotted, contoured or measured, and means associated with the measuring mark or index for producing a plot, contour or measurement of the object, the mirror device comprising two parallel sheets of transparent material having the same optical properties and the same thickness, the image reflected by one or both of the adjacent surfaces being substantially stronger than any images reflected by the remaining surfaces of the sheets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.