Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-08-08
1993-01-05
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 731, 324158P, 324158R, G01R 3102
Patent
active
051774372
ABSTRACT:
An apparatus for testing a circuit board is provided employing a probe panel having a high density of photoelectrically addressable electrodes, each of the electrodes being coupled to a photoelectric switch connected to an outside source such as a voltage strip, and further employing photoelectric means for selectively activating each photoelectric switch as desired to apply test signals to selected locations of a circuit board. In one embodiment, a light panel having an array of pixels having a form factor scalably matching the electrode array is used to activate the photoelectric switches. A second embodiment uses a second probe panel on the circuit board side opposite the first probe panel. The desired light panel is a liquid crystal display panel using a laser diode as a light source. Addressable light panels permit preprogrammed test patterns to be applied through a programmable signal driving device, such as a computer, that is programmed to light only those pixels desired to match the pattern of the printed circuit board under test. Since many printed circuit boards are first designed on a CAD system, the resultant design can be used as the data to define the test pattern for the circuit board. This arrangement allows a universal optically addressable probe panel to be used with any desired printed circuit board, and particularly, with a circuit board designed on a CAD system.
REFERENCES:
patent: 4507605 (1985-03-01), Geisel
patent: 4571542 (1986-02-01), Arai
patent: 4574236 (1986-03-01), Hechtman
patent: 4578279 (1986-03-01), Zingher
patent: 4851767 (1989-07-01), Halbout et al.
Dodd et al.; "Printed-Circuit Tester"; IBM Tech. Dis. Bull.; vol. 16; No. 9; Feb. 1974 p. 2848.
Karlsen Ernest F.
Photon Dynamics, Inc.
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