Shielded IC card
US5477421A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1993 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Nov 18, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/077
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An IC card is described which has a housing that is of low cost and which provides very good shielding against ESD/EMI (electrostatic discharge and electromagnetic interference), while securely holding a circuit board assembly and providing good contact with a ground conductor of the board. The housing comprises lower and upper housing halves (22, 24, FIG. 2), each molded of an electrically conductive polymer. The lower housing, half includes a bottom cover portion (90) and a pair of upstanding flanges (92, 94) that each forms part of a side of the housing. The upper housing half forms a top cover portion (100) and a pair of downwardly extending flanges (102, 104). The circuit board has a ground conductor (70) at its periphery which is trapped between the upper and lower housing halves to securely hold the circuit board in place and to electrically ground its ground conductor. Each housing half has platform parts (114, 116, 120, 122) that engage corresponding surfaces of the circuit board. The platform parts are staggered along the length of each housing side, to slightly bend each circuit board side and thereby hold the circuit board in place while assuring good electrical contact…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.