Circuit board
US4677529A · kind A · utility
23Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1986 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Mar 12, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/10196
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit board for use in a keyboard has a lower insulating sheet, an insulating sheet, and an upper insulating sheet stacked on top of each other. Switch circuit patterns are formed on the upper and lower insulating sheets so as to be opposed to each other. Circuit patterns acting as electrical parts such as rheostats are formed on the insulating spacer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.