Key unit
US5661793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47B2200/0078
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A key unit is provided with a first print substrate on which a contact portion and a LED capable to be mounted on flat surface are mounted, a conductive contact rubber, placed on the first print substrate, having a movable contact portion which can contact with the contact portion and an open portion in which the LED is accommodated, a key button placed on the conductive contact rubber, a LED lens, placed on the edge portion of the open portion of the conductive contact rubber, which leads the light beam generated from the LED in the open portion, and a key case having a through hole into which the key button is slidably inserted and a lens insertion hole into which the LED lens is inserted. The key unit may also be provided with a chip resistor to protect the LED, which is mounted on the first print substrate at a position below a lower end face of the key case. Further, a key button may be inserted into the through hole and a position where the LED lens is inserted into the lens insertion hole, the width of the LED lens is made to be shorter than that of the LED.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.