Secondary alignment fiducials for automatic alignment using mach

Details Secondary alignment fiducials for automatic alignment using mach Secondary alignment fiducials for automatic alignment using mach

1986-11-12

1988-07-05

Laroche, Eugene R.

Optics: measuring and testing

By alignment in lateral direction

With light detector

356399, 356401, G01B 1100

Patent

active

047550538

ABSTRACT:
Apparatus and method are provided for reducing processing time for aligning two parts by machine vision. The prior art approach of utilizing a substrate (b 14) with two spaced-apart targets (16a, 16b) and a top-plate (10) with two primary alignment openings (b 12a, 12b) spaced apart the same distance as the targets is improved by providing a set of fiducials (a pair of secondary openings (18a, 18b) or a pair of marks (18'a, 18'b) on the surface) in the top-plate. As a consequence of the novel approach, the vision system is not confused by the similar reflectivities of the target and the top-plate as the substrate and top-plate are brought into contact. Accordingly, alignment may be readily rechecked after assembly.

REFERENCES:
patent: 3744914 (1973-07-01), Gonda
patent: 4326805 (1982-04-01), Feldman et al.
patent: 4367046 (1983-01-01), Lacombat

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