Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1984-08-22
1987-04-14
Evans, F. L.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
250560, G01B 1110
Patent
active
046573950
ABSTRACT:
An apparatus for measuring the diameter of the cutting portion of a drill comprising supporting-rotating means for supporting the drill and rotating the drill about its axis; an image sensor having a light receiving surface parallel with the drill and composed of a plurality of sensor elements, the sensor elements being arranged in the light receiving surface in a row at right angles with the drill; optical means for forming parallel rays propagating toward the cutting portion of the drill and for forming a silhouette of the drill cutting portion on the light receiving surface of the image sensor; silhouette width recognizing means for receiving from the image sensor a plurality of output patterns representing varying silhouette widths while the drill is rotated through a predetermined angle and for storing the output pattern corresponding to the largest silhouette width as selected from among the plurality of output patterns; and reading-displaying means for reading out the stored data from the silhouette width recognizing means and for displaying the data as the diameter of the drill cutting portion. The diameter of the cutting portion is automatically detected from varying silhouette widths of the cutting portion projected on the light receiving surface of the sensor, and the diameter is digitally displayed. The apparatus is therefore easy to operate and provides an accurate measurement within a short period of time.
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patent: 4417147 (1983-11-01), Faville
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patent: 4532723 (1985-08-01), Kellie et al.
Kitamura Shirou
Shiraishi Takashi
Evans F. L.
Farley Joseph W.
Sanko Giken Kogyo Co., Ltd.
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