非接触3-Dディジタイジングシステムの開発研究

概要

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The purpose of this paper is to develop a non-contact 3-D digitizing system using an NC machine tool which can measure and free-form surfaces such as 3-D model shapes for injection molds speedily and accurately. The proposed 3-D digitizing sensor has a major advantage in that the location of a light spot obtained by passing laser light scattered from a target surface through a unique lens system is linearly proportional to the displacement of the surface in optical axis. This sensor, with a measuring range of 20 mm and resolution of 11μm /pixel, can measure the displacement of a target surface within an accuracy of ±50 μm for a steep inclined surface up to ±75 degrees without causing a dead angle called the shadow effect. The 3-D digitizing system which can measure 3-D model shapes at high measuring speed of more than 4 m/min is developed, in which the sensor is automatically moved up and down by servo-mechanism as the light spot to be detected exists always within the measuring range of sensor during the traversing of the NC machine tool Moreover the profiles of a 3-D model shape can be observed in real time.
公益社団法人精密工学会の論文
1990-06-05