Apparatus and method for the noncontact measurement of drill dia

Details Apparatus and method for the noncontact measurement of drill dia Apparatus and method for the noncontact measurement of drill dia

1989-11-06

1991-04-09

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356385, 250560, G01B 1100, G01B 1104

Patent

active

050059785

ABSTRACT:
A laser based, noncontacting measurement instrument is particularly adapted for the printed circuit board drilling industry to measure drill diameter, runout, and tip position under actual operating conditions. A laser beam is focused in space and the amount of light occluded by the drill bit as the bit is passed through the beam is sensed by a detector. Diameter, runout, and tip position are calculated by measuring the amount of occlusion, monitoring the position and angular orientation of the rotating drill, and correlating the amount of light occlusion to the position and angular orientation of the drill. The instrument automatically compensates for dust and debris in the optical path.

REFERENCES:
patent: 4657395 (1987-04-01), Shiraishi et al.
patent: 4678337 (1987-07-01), Cohen et al.

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