DOUBLE-ENDED CONTACT DEVICE FOR INSPECTING MULTILAYER PRINTED-CIRCUIT BOARDS Russian patent published in 2005 - IPC

FIELD: instrumentation engineering; nondestructive inspections of printed wiring on multilayer printed-circuit boards.

SUBSTANCE: proposed two-way contact device has top and bottom contact matrices with spring-loaded contacts, changeable top and bottom adapters, top and bottom sagging limiters for interface board, multilayer printed-circuit board under inspection whose overall dimensions exceed those of contact-matrix regular contact field; each of top and bottom changeable adapters has frame carrying first and second guide panels provided with holes to receive spring-loaded contacts connected to contact pads of multilayer printed-circuit board under inspection; flexible guide panel with holes whose diameter is smaller than that of holes receiving respective contacts; interfacing board made in the form of multilayer printed-circuit board; the latter and second guide panel have similar free (idle) holes at points of probable contact with lugs of spring-loaded contacts of contact matrix which are not used in the course of inspection, where there are no printed conductors of interfacing board; diameter of these holes is larger than that of respective lugs of spring-loaded contacts of contact matrix running to them; in addition, bottom changeable adapter has two changeable base locks for installing multilayer printed-circuit board under inspection. Such design provides for double-ended connection of multilayer printed-circuit board under inspection characterized in high layout density of external layers and in overall dimensions exceeding those of regular field of spring-loaded contacts of top and bottom matrices to arbitrarily disposed contact pads.

EFFECT: enlarged functional capabilities.

1 cl, 2 dwg