JPS5944891A - Method of recognizing presence or absence of wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an image recognition method using a visual sensor, and particularly to a method for recognizing the presence or absence of a wire on a pad.

(2) Background of the Technology Conventionally, printed wiring boards constituting the circuits of electronic arithmetic devices have a high wiring density, and even if a multilayer wiring board is used, there are wiring portions that cannot be processed by patterns. This wiring section is wired using discrete wires, but progress is being made in the development of wire bonding to automate this wiring.

(3) Prior art and problems Figure 1 shows a wire ending device 4'+' for discrete wire wiring on a printed wiring board. FIG. In the same figure, 1 is the XYY table 2 (
dA motor to nK FIB it, 3 is a chip for solder reflow, 4t is an electric TD to heat it, 5td
, a chip lifting motor, 6 a wire, 7 a wire feed roller, 8 a wire guide tube, 9 a television camera as a visual sensor, and 10 a printed wiring board.

For wiring using this device, first set the printed wiring board 10 on the XY table 1, move the XY table 1, use the television camera 9 to recognize the first pad to be soldered, and then supply the wires from the guide tube 8 to the first pad to be soldered. wire 6 to tip 3
Revised by "-Bon! 4. Next, the XY table 1 is moved, and the second pad that should be attached '4' is recognized by the TV camera 9, and the wire 6 is soldered there to complete the wiring between the first and second pads. When performing this bonding, it is necessary to confirm that there is a wire on the pad. However, the brightness difference between the node and the wire, t, is close to each other. It is difficult to separate the wires and pads clearly by the binarization process.

In other words, the field of view of the digital camera is subdivided into a large number of pixels, and the ary log value according to the brightness of each pixel is calculated by rFthal No. 46 Q (
: converted and using the r digital data, what is the average value of the brightness of the visual field with only the pad)? The difference between the average value of the visual field and the brightness when there is a wire on rad soil is very small, so
The existence of the wire is clearly taken into account as the previous (-).

(4) Object of the Invention In view of the above-mentioned conventional problems, it is an object of the present invention to provide a method for recognizing the presence or absence (position) of a wire on a pad, which can easily detect the presence or absence of a wire on a pad.

(5) Structure of the invention and purpose of the invention According to the CJ Honkoh, the visual field of 21 people is divided into a large number of pixels ((1), and the average value of the luminance data of each pixel is Wire for recognizing the wire to be bonded on the pad The present invention is accomplished by providing a method for recognizing the presence or absence of a wire, which is characterized by actively increasing the size of the wire.

(6) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a 6)/'c'th diagram illustrating the wire presence/absence recognition method according to the present invention. In the figure, 11 indicates a bonding pad, and 12 indicates a wire.

Is the method of the present invention bonding...? The wire 12 is illuminated in the direction perpendicular to the wire 12 as shown by arrow A with respect to the direction of the wire 12 to be bonded to the wire 11. 1; If the illumination direction is fixed at f and °C, yf
The direction of the lighting wire must be aligned in a constant direction with respect to all illumination directions.

When the light appears on the wire in this way and is illuminated in the direction perpendicular to it, a halation occurs in which the light emitted from the illumination light source 13 is reflected on the wire 12 and travels in the direction of arrow P, as shown in FIG. incident on the visual sensor 14. On the other hand, most of the light reflected by the nocud 11 travels in the direction of the arrow Q, and the light that enters the visual sensor 14 is weak. Therefore, the average value of the luminance data of each pixel obtained by subdividing the visual field of the visual sensor into many parts is large when there is a wire, and small when there is no wire. The presence or absence of a wire can be easily recognized by the magnitude of this average value.

(7) Effects of the Invention As explained in detail above, the method for recognizing the presence or absence of a wire according to the present invention d1 makes it possible to easily recognize the presence or absence of a wire by applying illumination in the direction perpendicular to the wire. Therefore, it can be applied to printed wiring board wires, HP bonding equipment, etc. with great effect.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining a wire bonding device for printed wiring boards, Fig. 2 and g(43('f, lf:
J, B5,000 with and without wire according to the present invention: 2) A diagram illustrating the identification method. In the drawing, 11i, I bonder pad, 12
13 is a wire, 13 is a light source, 14i, 14i: All 4 of the L sensors are shown. Special Edition 1 "One person? A Shitsu Co., Ltd. Patent Issue M1 Agent Patent Attorney Kan Ki Akira Patent Attorney Kazuyuki Nishidate Patent Attorney IJJ Yukio Patent Attorney Yama 1" Akiyuki Page 3

Claims (1)

[Claims] 1. The field of view of the visual sensor is divided into a large number of pixels, and the wire bonded to the bonding pad is recognized based on the average value of the luminance data of each pixel.In the wire presence recognition method, the illumination is set at right angles to the wire. This method of recognizing the presence or absence of a wire is characterized by causing halation on the wire by applying it to the pad, and actively increasing the brightness difference between the wire and the pad.