Optical keyswitch
US10637470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2019 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Jan 19, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/0238
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical keyswitch includes a casing having a movable portion, a shaft movably disposed on the casing, a resilient member accommodated in the casing, and a switch module including a circuit board, an emitter, and a receiver. The emitter emits an optical signal along an optical path to the receiver. When the shaft is at a non-pressed position, the movable portion has a first spatial relation with the optical path, and the receiver receives the optical signal of a first intensity. When the shaft moves, in response to a pressing force, to a pressed position, the shaft compresses the resilient member and pushes the movable portion to move, so the movable portion no longer has the first spatial relation with the optical path, the optical signal received by the receiver has a second intensity different from the first intensity, and the switch module is triggered to generate a triggering signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.