Method of reading optical image of inspected surface and image r

Details Method of reading optical image of inspected surface and image r Method of reading optical image of inspected surface and image r

1991-05-29

1993-03-23

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

356237, 356435, 358106, 382 62, 382 65, G06K 900

Patent

active

051971054

ABSTRACT:
A set of red light sources (111-113) are provided above a printed board (20). One (111) of the light sources located in the angular aperture of an imaging lens system (140). The red light is applied to the printed board and reflected on a wiring pattern (22) provided thereon. Another light source (120) is provided under the printed board, and emits infrared light to the back surface of the printed board. The infrared light passes through a through hole (25) formed in the printed board and then enters the imaging lens system together with the red light reflected. Compound light consisting of the red light and the infrared light passes through the imaging lens system and is then splitted into the red light and the infrared light at a cold mirror (150). The respective lights are detected by image sensors (161, 162), to thereby obtain respective images of the wiring pattern and the through hole.

REFERENCES:
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patent: 4922308 (1990-05-01), Noguchi et al.
patent: 5027295 (1991-06-01), Yotsoya
"Optical Device for Inspecting Appearance of Pattern of Printed Circuit Board", Electronic Packaging Technology, vol. 8, No. 3, pp. 42-45, 1985-Japan.
"Structure and the Present Situation of Automation System of Visual Inspection", Pixel, No. 42, pp. 70-72, 1986, published by Figure Processing Information Center, Japan.

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