Dustproof structure for optical coordinate input apparatus
US4769535A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Dec 5, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical coordinates input apparatus includes pairs of first light emitting elements and first light receiving elements, a plurality of pairs of second light emitting elements and second light receiving element having a light path intersecting a light path of the first light emitting elements and the first light receiving elements, and a filter section disposed on the front side of the light paths of the optical semiconductor elements for passing therethrough a light in the paths. The apparatus further includes a device from preventing a flow of an air containing dust from entering a space between the optical conductor elements and the filter section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.