| 摘要 |
<p>A fluid actuated test fixture (10) with springless contacts (24) for use in the automatic testing of printed circuit boards (12) is connected to an electronic circuit tester for performing high-speed testing of circuits on the board (12). The fixture (10) includes a housing (14), an inner chamber formed by covering the opening of an air chamber housing (46) with an elastomeric diaphragm (42), a support plate (16) with a flex circuit (30) laminated along one side, and an array of solid (springless) test probes (24) disposed in the support plate (16) for access to a surface of the circuit board (12). When the circuit board (12) to be tested is placed on the fixture (10), a vacuum drawn between the circuit board (12) and support plate (16) urges the circuit board (12) to contact the test probes (24). When the pressure within the inner chamber is increased, the probes move into the diaphragm (42) to stretch the diaphragm (42) and the diaphragm (42) applies a resilient spring-like counter-force against the test probes (24) in unison, which transfers the spring force to the test points (24) on the board (12) under test.</p> |
