Gap measurement tool

Details Gap measurement tool Gap measurement tool

1978-06-29

1979-08-21

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 3, 356372, 356401, G01C 300

Patent

active

041651782

ABSTRACT:
The gap between a component and its associated substrate is measured by casting an edge line shadow in a spot of light directly below an edge of the component. A viewing means is fixed at a predetermined angle with the vertical from the board. The viewing means is adjusted tangent to either the edge shadow of the component in the light spot or the bottom edge of the component. The distance that the viewing means is moved horizontally from either the edge shadow in the light spot or the bottom edge of the component to the other is measured. This measured horizontal distance forms one side of a right triangle and the other side which is the vertical distance between the edge shadow in the light spot on the board and the bottom edge of the component, can be calculated from the measured side length and the opposite angle which is the fixed angle the viewing means makes with the vertical from the board.

REFERENCES:
patent: 3137756 (1964-06-01), Gunther et al.
patent: 3139792 (1964-07-01), Wenthe
patent: 4113389 (1978-09-01), Kaye

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