Membrane keyboard construction
US4596905A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1985 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | Jan 14, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2231/012
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A membrane keyboard construction is provided and comprises two circuit layers, a spacer disposed and secured between the circuit layers and having an opening passing therethrough to permit the circuit layers to be pressed together in the opening and thereby provide a switching function, a face plate, and an adhesive layer disposed between the face plate and one of the circuit layers and securing the face plate to the one circuit layer, the adhesive layer having a passage therein and leading from an area thereof that is aligned in superimposed relation with the opening to the exterior of the construction to vent that area thereof. The area is isolated from the opening by the one circuit layer and is vented by the passage to tend to enhance tactile feel and avoid false switch closure of the opening by tending to prevent entrapment of air bubbles in the area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.