04799175 is referenced by 104 patents and cites 15 patents.

Printed wiring boards (PWBs) applied to this inspection system are previously formed with marks in prescribed positional relation to wiring patterns. Deviation of PWBs with respect to absolute coordinates of the inspection system is detected by reading the marks. The PWBs are sequentially set one by one on a movable table, to be subjected to image acquisition of the marks and inspected areas. A first PWB is image-acquisited whereby obtained binary image data of the inspected area are stored in a memory unit. Thereafter a second PWB is image-acquisited, and in advance to the image acquisition of its inspected area, relative misregistration of the both PWBs is found by deviation data on respective marks of the first and second PWBs. The binary image data of the first PWB is read from the memory unit on the basis of the binary image data of the second PWB. When the binary image data of the first PWB are read, positional correction, i.e., time base correction is performed on the read data to correspond to pixels of the second PWB under image acquisition on the basis of data on the previously found amount of relative misregistration. The data on corresponding pixels of the both PWBs are compared with each other thereby to inspect difference between the patterns of the PWBs on the basis of the result of the comparison.

Title
System for inspecting pattern defects of printed wiring boards
Application Number
6/733506
Publication Number
4799175
Application Date
May 10, 1985
Publication Date
January 17, 1989
Inventor
Hisayuki Tsujinaka
Kyoto
JP
Masafumi Kawatani
Takatsuki
JP
Takumi Yoshida
Kusatsu
JP
Eiji Kodama
Higashi-Osaka
JP
Tetsuo Hohki
Kyoto
JP
Tetsuo Sano
Kyoto
JP
Agent
Brumbaugh Graves Donohue & Raymond
Assignee
Dainippon Screen Mfg Co
JP
IPC
H04N 7/00
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