Portable semiconductor memory unit

Details Portable semiconductor memory unit Portable semiconductor memory unit

1991-06-17

1993-04-27

Pellinen, A. D.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

361220, 361 56, H05F 300, H05F 304

Patent

active

052067831

ABSTRACT:
A semiconductor memory unit has a card body (1) with conductive panels (2, 2') on its surface. Insulating layers (10, 10') are provided on the inside of the conductive panels (2, 2'). A circuit board (5) is provided in the card body (1). A battery contacting member (8) is located close to one of the insulating layers (10, 10'), and is connected with a circuit grounding terminal. A portion (10a) of the insulating layer (10), which is opposed to the battery contacting member (8), is formed to have lower electrostatic breakdown voltage than the other portions of the insulating layers (10, 10'). Thus, when a high voltage ESD noise is applied to the conductive panels (2, 2'), the noise is discharged to the ground through the portion (10a) of the insulating layer (10) and the battery contacting member, so that the memory unit can be free from the bad influence of the noise.

REFERENCES:
patent: 3887848 (1975-06-01), Larson et al.
patent: 4617605 (1986-10-01), Obrecht et al.
patent: 4661889 (1987-04-01), Fushimoto
patent: 4667266 (1987-05-01), Masuoka et al.
patent: 4795898 (1989-01-01), Bernstein et al.
patent: 4817234 (1989-04-01), Greulich

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