Method and apparatus for detecting defects of printed circuit pa

Details Method and apparatus for detecting defects of printed circuit pa Method and apparatus for detecting defects of printed circuit pa

Filed on

1984-04-16

Date issued

1987-03-31

Examiner

Karlsen, Ernest F.

Patent Class

Electricity: measuring and testing

SubClass

Plural, automatically sequential tests

Other Related Categories

356394, G01R 1512, G01B 1100

Type

Patent

Status

active

Patent number

046545832

Description

ABSTRACT:
A printed circuit pattern inspection system, in which the optical image of circuit patterns is transformed into an electrical signal, the signal is converted into a binary digital signal, the connectivity relationship between selected two points of pattern in the form of binary signal is examined, connection data representative of the connectivity relationship and expressed by a pair of numbers given to the points is generated, and the connection data is compared with design data which is produced from design information and expressed in the form of a circulation list of numbers given to points in linkage relationship, whereby determination of defectiveness of patterns is made basing on the result of comparison.

REFERENCES:
patent: 3976864 (1976-08-01), Gordon et al.
patent: 4153896 (1979-05-01), White
patent: 4508453 (1985-04-01), Hara et al.

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