Captivated, pre-loaded spring means for vacuum displaced circuit board testing
US4701700A · kind A · utility
Inventor
Key dates
| Filing date | Dec 2, 1985 |
| Grant date | Oct 20, 1987 |
| Priority date | — |
| Expiry date | Dec 2, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R1/07328
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Circuit board testing apparatus includes combination comprising structure including two generally parallel plates defining a space therebetween to which vacuum is applicable, there being circuit test probes projecting toward said space, and associated with one or the other of the plates, the remaining plate adapted to receive a circuit board for circuit testing; pre-loaded, resiliently deflectible devices including captivated springs carried by one or the other of the plates, so that such devices project into said space; and seal means on the remaining plate to be engaged by the circuit board for positive pressure sealing in response to vacuum application to said spaced. As a result, the vacuum in said space effects such sealing as one of the other of the plates is relatively movable forwardly toward the other in response to such vacuum application, thereby to further resiliently load the preloaded devices and to cause the probes to engage circuit board circuitry only after such sealing has been effected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.