PURPOSE: To maintain initial precision for a long period by making a self-diagnosis of an optical system, and altering conditions on which the center position of the hole is detected according to the diagnostic result.
CONSTITUTION: The hole 2d of a printed board 2c arranged at right angles to the optical axis T of spot luminous flux 2b emitted by a projection part 2a is irradiated with the spot luminous flux 2b. The output of the four-divided photodetecting element of a photodetection part 2g varies in proportion to the deviation of the hole 2d of the printed board 2c and its output is inputted to a microcomputer 2F through amplifying circuits 2AW2D and an A/D converter 2E. The microcomputer 2F calculates the quantity of correction and controls servo-motors 2H and 2J through a servo driving circuit 2G to align the insertion position of an electric insertion component to the hole center position of the printed board 2c. Further, the microcomputer 2F detects abnormality on the basis of the output of the photodetection part 2g in normal operation to alter the conditions of the center position detection of the hole.
TSUJI YUKIRO
YOSHIHARA MINORU
ASHIHARA KEIGAN
