Measuring instrument with digital display
US4229883A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1979 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | May 3, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/347
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring instrument with digital display including a relatively elongate caliper body formed with a measuring part adapted to make measuring engagement with an article to be measured and a slider freely slidable in a longitudinal direction of the caliper body and formed with a measuring part disposed opposite to the measuring part of the caliper body. In the measuring instrument a transparent linear scale is fixedly disposed on the caliper body with its axis extending in the longitudinal direction of the caliper body and a transparent index scale is mounted on the slider with its calibrated face disposed opposite to the calibrated face of the linear scale and slightly spaced apart relationship. A measuring circuit including a digital display element is mounted in the slider and is electrically connected to a light emitting element and a light receiving element mounted in the slider. The light emitting element and the light receiving element are disposed opposite to each other with the linear scale and the index scale interposed thereinbetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.