Plug-in circuit cartridge with electrostatic charge protection

Details Plug-in circuit cartridge with electrostatic charge protection Plug-in circuit cartridge with electrostatic charge protection

1978-02-02

1979-12-18

Lake, Roy

Geometrical instruments

200 511, 339 19, 339150R, 339222, H01R 1352

Patent

active

041791789

ABSTRACT:
A plug-in cartridge designed to mate with an external system via a connector having a plurality of external mating receptacles, and one or more external actuator pins, for engaging the cartridge. The cartridge encloses a printed circuit board with terminals arranged to receive an electrical circuit (e.g., an integrated circuit) susceptible to damage by excessive electrostatic charge. The circuit board includes a plurality of metallic contact areas conductively connected to respective terminals, extending external to the cartridge, and configured to engage the mating receptacles of the connector. The cartridge also includes a protection device comprising a plurality of conductive fingers formed from a common conductive element. The device is arranged such that, when the cartridge and connector are disengaged, the fingers contact associated ones of the contact areas whereby the contact areas and therefore the circuit terminals are connected in common (i.e., shorted) to preclude circuit damage due to electrostatic charge. When the cartridge is mated to the connector, the actuator pins contact the device to lift the fingers off the contact areas, thereby permitting the electrical circuit to operate in expected fashion.

REFERENCES:
patent: 2848706 (1958-08-01), Besserer
patent: 3200365 (1965-08-01), Carpinone
patent: 3576515 (1971-04-01), Frantz
patent: 3946390 (1976-03-01), Alexander et al.
patent: 4070557 (1978-01-01), Ostapovitch

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