Electrical connectors – Contacts arranged for sequential connection – With contact preventer to require joining in a given sequence
Patent
1989-12-22
1992-03-03
Abrams, Neil
Electrical connectors
Contacts arranged for sequential connection
With contact preventer to require joining in a given sequence
H05K 114
Patent
active
050927990
ABSTRACT:
Disclosed is a connecting mechanism for a memory card for connecting a detachable memory card and terminal equipment. The connecting mechanism comprises: a pair of connectors respectively provided on the card side and the terminal equipment side, in which a difference in the length of terminals is provided between both grounding and power input terminals and terminals other than the grounding and power input terminals in such a manner as to establish an electrical sequence in which, during insertion of the memory card, the grounding and power input terminals make electrical contact in advance of the other terminals and when separated lag electrically behind the other terminals; a card guide provided on the terminal equipment side and having predetermined dimensions for restricting angle of inclination of the memory card during insertion or withdrawal thereof so as to obtain the electrical sequence; and a unilateral or bilateral terminal equipment-side buffer circuit provided for all input/output lines excluding a power input line and a grounding line in the terminal equipment, whereby the insertion or withdrawal of activated lines is made possible with respect to the input/output lines excluding a card enable signal line.
REFERENCES:
patent: 4079440 (1978-03-01), Ohnuma
patent: 4510553 (1985-04-01), Faultersack
patent: 4574332 (1986-03-01), Calabro
patent: 4849944 (1989-07-01), Matsushita
Dual-Level Printed Circuit Board Edge Connector; Kenneth Mason Publications, Ltd, England, No. 280, 8-1987.
IBM Bulletin, Sequential Contact Mating, vol. 31, No. 10, p. 284, 3-1989.
Abrams Neil
Mitsubishi Denki & Kabushiki Kaisha
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