Bore measuring system

Details Bore measuring system Bore measuring system

1984-02-23

1987-08-18

Rosenberger, R. A.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356378, 356385, G01B 1102

Patent

active

046873287

ABSTRACT:
A bore measuring system to optically measure the diameter of hole on thin boards, such as printed circuit boards. The bore measuring system of the invention is so contrived as to irradiate a hole to be measured, to project the light through the hole onto the receiving surface of the image sensor and to indicate the diameter of the hole by converting the output from the image sensor, corresponding to the size of the image, into a numerical figure. Unlike the conventional methods, measurement is possible simply by irradiating the hole to be measured without inserting any pin or measuring rod of a hole gauge into the hole, and without projecting the image to be measured onto a screen. Accordingly, the operation is quite simple and the measuring time can be shortened, yet measuring errors can be avoided. Moreover, the automatic display of hole diameter in a numerical value eliminates the reading errors which often occur with conventional methods.

REFERENCES:
patent: 3746455 (1973-07-01), Flamholz
patent: 4147052 (1979-04-01), Tsujiuchi et al.
patent: 4463600 (1984-08-01), Hobbs et al.
patent: 4531625 (1985-07-01), Yonekura et al.
"Novel Electro-Optical Instrument for Hole--Diameter Measurement", Fulkner, IEE Proc., vol. 127, 9/1980, pp. 443-445.

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