Position detector for chip mounter

Details Position detector for chip mounter Position detector for chip mounter

1997-03-06

1999-05-04

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

25055934, 356385, G01B 1100

Patent

active

059009403

ABSTRACT:
A method and apparatus for accurately determining the location of a component picked up by a pickup device for facilitating accurate mounting of the component. The method employs an arrangement wherein diffusion-type light sources can be employed and the coordinates of the corners of the component are determined by measuring the shifting of the shadow of the component on a receptor by illuminating the light sources in sequence. In some instances, the accuracy of the measurement can be improved by rotating the component this being particularly useful if the component has a shape that deviates greatly from a square shape.

REFERENCES:
patent: 3781115 (1973-12-01), Rader et al.
patent: 4559452 (1985-12-01), Igaki et al.
patent: 5467186 (1995-11-01), Indo et al.
patent: 5559727 (1996-09-01), Deley et al.
patent: 5570993 (1996-11-01), Onodera et al.
patent: 5619528 (1997-04-01), Sakurai

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