Electronic viewing system for integrated circuit packages

Details Electronic viewing system for integrated circuit packages Electronic viewing system for integrated circuit packages

1984-10-12

1986-08-05

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 93, 362 89, 362227, 362249, 362250, 362251, 362252, H04N 718

Patent

active

046046488

ABSTRACT:
A system for viewing circuit leads mounted on glassy substrates employs unidirectional illumination at an acute angle selected to avoid impingement of direct reflected light onto the objective of the viewing system. Selecting the direction of the light to extend in a vertical plane parallel to parallel fingers or leads eliminates reflections from interdigital areas which have mirror-like concave surfaces due to menisci of the glassy surface at the metal lead edges.

REFERENCES:
patent: 3903363 (1975-09-01), Montone
patent: 4025777 (1977-05-01), Hayakawa
patent: 4028728 (1977-06-01), Sharp
patent: 4072928 (1978-02-01), Wilder
patent: 4095464 (1978-06-01), Breedijk
patent: 4556903 (1985-12-01), Butchington

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