JP2734573B2 - Illumination device for ceramic substrate mark recognition - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for recognizing a printed circuit board mark that irradiates a printed circuit board with light in an electronic component mounting device with visual recognition.

2. Description of the Related Art Conventionally, a red LED or the like has been mainly used as an illumination device for recognizing a target mark of a printed circuit board used in an electronic component mounting apparatus with this type of visual recognition.

That is, as shown in FIG. 2, the target mark 2 on the printed circuit board 1 to be visually recognized
The target mark 2 is photographed by the camera 4 using the LED 3. The captured screen is processed by the control unit 5 and is displayed on the monitor 6.

Problems to be Solved by the Invention However, as shown in FIG. 3, the outline of the target mark 2 usually appears clearly. However, depending on the material of the printed circuit board 1 and the material of the target mark 2, the captured screen May not be able to clearly show the outline of the target mark 2 as shown in FIG.

Therefore, the present invention is an illumination device that enables a contour of a target mark to be clearly obtained on a binarized photographing screen captured by a camera, regardless of a printed board and a target mark of any material.

Means for Solving the Problems And technical means of the present invention for solving the above problems are shown below. FIG. 5 is a graph obtained by multiplying the measurement results of the spectral wavelength characteristics of the reflected light by the sensitivity characteristics of an image sensor (CCD) used for photographing, for various printed circuit board materials and target mark materials.

By using this, it is possible to quantitatively determine which printed circuit board reflects light of which band wavelength well and appears bright at the time of photographing.

In order to make the contour of the target mark clear even with any combination of any substrate and any target mark, an illuminating device having the band of the most effective wavelength is used using the spectral wavelength characteristic graph of FIG. That is an important point.

For example, in the case of recognizing the target mark position of silver palladium on a ceramic substrate, in FIG. 5, at a wavelength of 570 nm, there is a difference of A in the brightness on the monitor, but at a wavelength of 660 nm, a difference of A is observed. You can't get it. In other words, if the target mark is silver palladium on the ceramic substrate, it can be determined that light having a wavelength of 570 nm is more advantageous.

Operation The operation of this technical means is as follows. Printed boards are roughly divided into glass epoxy boards and ceramic boards. As can be seen from FIG. 5, in the case of the glass epoxy substrate, the brightness of the reflected light reflected on the camera is dark, and the contour of the target mark is clear even in light of any wavelength band. However, it can be seen from FIG. 5 that in the case of a target mark of copper or silver palladium on the ceramic substrate, the difference between the yellow light and the red light is considerably different in the brightness of the reflected light reflected on the camera. That is, when light containing a large amount of light in the yellow wavelength band (540 to 580 nm) is applied to the substrate, the contour of the target mark can be clearly defined on both the glass epoxy substrate and the ceramic substrate.

As a result, the position of the target mark is more accurately recognized, and it is considered that this greatly contributes to improving the component mounting accuracy of the board.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1A, reference numeral 7 denotes a head which can be positioned arbitrarily in the XY direction, and has a target mark recognition camera 8 and an electronic component suction nozzle 9. At the time of mounting electronic components, first, the camera 8 recognizes the position of the target mark 11 on the printed circuit board 10 and calculates the position.
Next, the nozzle 9 sucks the electronic component 13 in the electron supply unit 12, and the head 7 moves to a predetermined position where the electronic component is mounted, and performs mounting.

The present invention relates to a lighting device required when capturing an image in a process of recognizing a target mark 11. FIG. 1b is a schematic view of the lighting installation.

Reference numeral 14 denotes a yellow LED which irradiates the target mark 11 on the printed circuit board 10 and captures an image with the camera 8. The captured image is binarized by the control unit 15, and the image is displayed on the monitor 16. By using the yellow LED 14, the image of the target mark on the monitor 16 is clearly projected on any substrate as described above.

Effect of the Invention According to the present invention, regardless of the material of the printed board and the target mark, not only can the outline of the image of the target mark be clearly projected on the monitor, but also the position of the target mark can be It became possible to recognize more accurately. Thereby, the mounting accuracy of the electronic component is greatly improved.

[Brief description of the drawings]

FIG. 1A is a schematic perspective view of the entire electronic component mounting apparatus according to an embodiment of the present invention, FIG. 1B is a schematic diagram of an illumination device,
FIG. 2 is a schematic diagram of a conventional illuminating device for recognizing printed circuit board marks, FIG. 3 is a monitor screen image obtained by capturing a target mark in a good illumination state as an image with a camera and binarizing the image, FIG. 5 is a monitor screen diagram when the illumination condition is poor, and FIG. 5 is a graph showing the measurement results of spectral wavelength characteristics of reflected light on various printed circuit board materials and target mark materials with respect to brightness. 8 ... Camera, 10 ... Printed circuit board, 11 ... Target mark, 13 ... Electronic component, 14 ... Yellow LED.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Makoto Seno 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-161700 (JP, A) -206357 (JP, U)

Claims (1)

(57) [Claims] An image of a target mark of silver palladium foil or copper foil provided on a ceramic substrate is captured by a camera, and a ceramic is used to clarify a difference in brightness of the target mark with respect to the ceramic substrate in the captured image. A ceramic substrate mark recognition illumination device that irradiates light onto a substrate, wherein the wavelength band of the irradiating light is
An illumination device for recognizing a ceramic substrate mark having a wavelength of 540 to 580 nm.