Inspection method and apparatus for joint junction states

Details Inspection method and apparatus for joint junction states Inspection method and apparatus for joint junction states

1985-03-01

1987-02-10

Brimiel, Howard A.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73588, 73643, 73655, 73657, G01N 2904

Patent

active

046415270

ABSTRACT:
An object to be inspected which is jointed to a circuit board is vibrated in a contactless manner by applying a gas jet or a magnetic force to the object, a laser beam is irradiated on the object, and a laser beam reflected from the object is detected by a linear sensor to observe a laser speckle pattern for the object. Quality of a joint junction state of the object is judged from the laser speckle pattern.

REFERENCES:
patent: 2728220 (1955-12-01), Willner
patent: 3645129 (1972-02-01), Grant
patent: 3952583 (1976-04-01), Rosati
patent: 4046477 (1977-09-01), Kaule
patent: 4121470 (1978-10-01), Kaule
patent: 4218922 (1980-08-01), Ensminger
patent: 4287766 (1981-09-01), Ensminger
patent: 4484820 (1984-11-01), Rosencwaig

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