JPH05248820A - Lighting apparatus - Google Patents

Abstract

PURPOSE:To prevent the defective recognition and the erroneous judgment in reading with a CCD camera by imparting the difference in amount of light on the solder resist pattern and the character pattern for the copper pattern of a printed wiring board. CONSTITUTION:This apparatus is constituted of cold filters 2, light sources 1, which can change the light amounts through red, green and blue filters 3a, 3b and 3c, an optical fiber 5, which guides out the lights that generate red, green and blue colors and a ring lighting part 6, wherein the red, green and blue parts are arranged in this sequence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly to a solder resist (SR) for a copper pattern of a printed wiring board.
The present invention relates to a lighting device used for measuring the positions of patterns and character patterns.

[0002]

2. Description of the Related Art A conventional illuminating device has a light source 1 which emits light through a cold filter 2 as shown in the configuration diagram of FIG.
It has a variable power source 4 for changing the light amount of the light source 1, an optical fiber 5 for guiding the light from the light source 1, and a ring illumination section 6 in which the optical fibers 5 are arranged in a ring shape.

[0003]

In the above-described conventional lighting device, since only white light is emitted, the copper pattern of the printed wiring board and the green SR pattern and the white and yellow character patterns printed on the substrate are provided. When the CCD is read by a CCD camera, there is a problem that a sufficient light amount difference cannot be obtained and recognition failure or erroneous determination occurs.

[0004]

SUMMARY OF THE INVENTION An illumination device of the present invention includes a light source for emitting light through a cold filter and a color filter having red, green, and blue colors, respectively, and changing the light amount of the light source. And a ring portion in which optical fibers for guiding the respective lights from the light source are arranged in a ring shape in the order of red, green and blue.

[0005]

The present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an illumination device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram showing a measuring method using the illumination device according to an embodiment of the present invention.

As shown in FIG. 1, this embodiment has a light source 1 which emits light through a cold filter 2 and further red, green and blue filters 3a, 3b and 3c which are colored red, green and blue respectively. 1. A variable power source 4 for changing the light amount of each of 1, an optical fiber 5 for guiding the red, green, and blue light from the light source 1 through red, green, and blue optical fibers 5a, 5b, 5c, and each optical fiber for red. ，
It has a ring illumination unit 6 which is arranged in a ring shape in the order of green and blue and radiates light downward. Further, as shown in FIG. 2, the CCD camera 7 in which the lens 8 is positioned inside the ring illumination and is inverted downward is used.

Next, referring to FIGS. 1 and 2, a method of reading an SR pattern and a character pattern from a copper pattern of a printed wiring board 9 by a CCD camera 7 using the present lighting device will be described. First, the printed wiring board 9 is placed directly below the camera 7. Next, the light amount of the light source 1 is changed by the variable power source 4 to give intensity to red, green, and blue light, and the light color is matched with the color of the pattern to be measured. Then, the SR pattern and the character pattern for the copper pattern of the printed wiring board 9 are C
It is read by the CD camera 7.

[0009]

As described above, since the present invention emits colored light corresponding to the color of the object to be measured, it is possible to create a sufficient contrast for the CCD camera and prevent recognition failure and erroneous determination. This is possible and has the effect of improving the inspection accuracy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a measuring instrument using the illumination device according to the embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional lighting device.

[Explanation of symbols]

 1 Light Source 2 Cold Filter 3a Red Filter 3b Green Filter 3c Blue Filter 4 Variable Power Supply 5 Optical Fiber 5a Red Fiber 5b Green Fiber 5c Blue Fiber 6 Ring Illuminator 7 CCD Camera 8 Lens 9 Printed Wiring Board

Claims (2)

[Claims] 1. A cold filter, each light source that emits light through a color filter having red, green, and blue coloring, each power source that changes the light amount of the light source, and the light from the light source. An illuminating device comprising: each optical fiber to be led out; and a ring illuminating section in which the optical fibers are arranged in a ring shape in the order of red, green, and blue. 2. The illumination device according to claim 1, wherein when the pattern is read by the CCD camera, the light color is adjusted to the color of the read pattern to be measured.