Abstract: The present invention relates to a printed circuit board provided with electrical contact devices (7) and intended to be mounted in the back plane of a card frame (2) such as to form a magazine (1) in which printed circuit cards (6) having electrical contact devices (8) corresponding to the contact devices (7) on the board can be inserted at right angles to the back plane. The circuit board (3) forms an electrical connecting unit for the circuit cards in the back plane of the magazine. In accordance with the invention, the circuit board is configured to provide a self-supporting and stiffening structure in the form of a sandwich element (10).
Type:
Grant
Filed:
August 31, 1989
Date of Patent:
August 7, 1990
Assignee:
Telefeonaktiebolaget L M Ericsson
Inventors:
Torbjorn R. Olsson, Bjorn T. Kassman, Karl Gustaf Olsson, Stig C. Ernolf, Per-Ove Nilsson, Rolf I. B. Kjellsson, Lars H. Widoff