Detection device of printed circuit board

Abstract

A detection device of a printed circuit board radiates light corresponding to the characteristics of the objects, such as pad, resist, etc., to carry out a detection of excellent precision. The detection device (1) of the printed circuit board (7) is equipped with a red LED (32) configured to be a bright field illumination first angle relative to a camera (6); a second color light source (4) which is an illumination carried out by a green fluorescent lamp, and a third color light source (5) composed of a blue LED configured as a dark field illumination third angle relative to the camera (6). The light of the first and third color light sources (3,5) is used and the camera (6) is used to shoot the image of the printed circuit board (7), and the image generated by the light come from a red LED (32) as the bright field illumination is used to detect whether the scar (71b) and concave scar (71c) on the surface of the pad are discolored; in addition, the image generated by the light come from a fluorescent lamp as a green diffused illumination is utilized to detect the formation state of the outline (71a) of the pad (71), so that the image come from a blue LED, namely the third color light source (5), is used to detect the accumulation and defect of the resist and in addition, the situations, such as pattern broken line, short circuit, etc., below the resist.

Description

technical field [0001] The present invention relates to an inspection device for a printed wiring board capable of accurately inspecting pads, resist, and the like formed on the surface of the printed wiring board. Background technique [0002] Usually, a camera acquires images of pads, resists, and the like formed on the surface of a printed wiring board, and inspections are automatically performed based on the images. [0003] However, when an image of a printed circuit board is obtained by such an inspection device, when light is irradiated from a direction that is regular reflection with respect to the camera (that is, bright field illumination), the light is strongly affected by edges, corners of uneven parts, and the like. reflection, the shape of the edge cannot be detected smoothly. Therefore, generally, when acquiring an image of a printed circuit board, the image is acquired under dark-field illumination in which light is irradiated from a direction different from...

AI Technical Summary

Problems solved by technology

[0003] However, when an image of a printed circuit board is obtained by such an inspection device, when light is irradiated from a direction that is regular reflection with respect to the camera (that is, bright field illumination), the light is strongly affected by edges, corners of uneven parts, and the like. reflection, the shape of the edge cannot be detected smoothly

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