JPS6238306A - Monitoring method for wave-height of jet solder - Google Patents

Abstract

PURPOSE:To make the monitoring of the wave-height of a jet solder unmanned by outputting the alarm of the wave-height abnormality according to the contact on the monitor television of the image of the jet solder wave surface obtd. from TV camera and the check point set to the allowable lower and upper limits of the variation thereof. CONSTITUTION:The waveface 15 of the jet solder from a nozzle 13 is caught by a TV camera 31, the image 15a of the wave surface thereof is processed by an image processor 32 and displayed by a monitor TV 33. The image 15a thereof is displayed in white and the background in black. Now the check point 43, 44 to express the allowable lower limit and allowable upper limit of the variation in the wave surface 15 is set by operating the unit 32 with watching the TV 33. The point 43, 44 thereof has a switching function, outputs a motion signal to an alarm 34 when the image 15a varies in the vertical direction and approaches the point 43, 44 and informs a controller of the wave surface 15 reaching to the allowable limit. The monitoring of high accuracy by the TV camera can thus be performed and the reliability in soldering can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for monitoring the wave height of jet solder related to automatic soldering.

[Conventional technology]

Conventionally, in jet soldering baths, automatic soldering is carried out by bringing the molten solder jetted from a nozzle into contact with the object to be soldered, and while the soldering bath is in use, the state of contact of the jetted solder with the printed wiring board is checked from time to time by visual inspection. Alternatively, the state of soldering as a result is monitored, and from this state, it is conversely monitored to see whether the wave height of the jet wave front is appropriate.

[Problem that the invention seeks to solve]

However, such visual monitoring of the wave height first requires an observer, who must periodically monitor the wave height, and then determines the contact state of the solder jet and the soldering according to the intuition of this observer. Since the conditions are in the same place, there is a lack of objectivity, and there is a risk of a lack of reliability in consistently performing proper soldering.

An object of the present invention is to provide a method for monitoring the wave height of a solder jet, which can constantly monitor the wave height of a solder jet unattended, and to improve the reliability of soldering.

[Means for solving problems]

The method of monitoring the wave height of molten solder according to the present invention involves directing a television camera 3 toward a wave surface 15 of molten solder jetting from a nozzle 13.
1, and the wavefront image 15a obtained from the television camera 31 and the checkpoints 43 and 44 set as the permissible lower limit and upper limit of this wavefront fluctuation are sent to the monitor television 33 via the image processing device 32. When the image 15a of the wavefront comes into contact with the checkpoint 1-43.44 on the monitor television 33, the image processing bag r1132 outputs an abnormal wave height alarm of the solder jet.

[Effect]

In the present invention, the wavefront 15 of the solder jet is captured by the television camera 31, and an image 15a of this wavefront is projected on the monitor television 33.
The lower and upper limit checkpoints 43 and 44 are set by operating the image processing device 32 while looking at the image a.

Then, when the image @1Sa of the wavefront 15 fluctuates in the vertical direction on the screen of the monitor television 33 and reaches the checkpoint 43, 44, the image processing device 32 issues a wave abnormality alarm via a buzzer or the like. and notify people of the abnormality.

(Example) Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.

As shown in FIG.
This solder I/f 111 has a nozzle 13 provided inside a tank body 12, and houses molten solder 14 controlled at a constant level III by a heater inside the tank body.

Then, when the molten solder 14 is pumped to the lower opening of the nozzle 13 by a pump (not shown) provided in the tank body 12, the molten solder is jetted from the upper opening of the nozzle 13, so that the wave surface of this jetted solder Print distribution I on 15! By transporting the board so that the bottom surfaces of the board are in contact with each other, a portion of the jet solder can be soldered to the printed wiring board.

This type of jet soldering tree 1l-17) has a light 2 on the upper side.
1, and from this light 21 the wA flow soldering wavefront 1
Irradiate light to 5.

Also, a television camera 3 is directed toward the jet solder wavefront 15.
Set 1 horizontally. As the television camera 31, a COD camera using a charge coupled device (generally called COD) or the like is suitable.

This television camera 31 is connected to an image processing bag fit (controller in the product name video checker) 32, and the video processed by this image processing device ff32 is displayed on a monitor television (CRT>33.
The station 32 and the monitor television 33 are placed in a central control room or the like.

The image processing device i32 is integrally or separately provided with an alarm device 34 such as a buzzer, and a determination output signal is outputted from the image processing device 32 to the alarm device 34.

As shown in FIG. 2, the image processing equipment 32 processes an image 15a of the wavefront 15 obtained from the television camera 31.
The monitor television 3 serves as a light (bright) area 41.
3 is displayed in white. This is because the wavefront 15 of the jet stream becomes brighter when exposed to light. On the other hand, by making the background of the wavefront 15 black, the upper side of the image 15a becomes a dark area 42 and is displayed in black on the television screen.

Next, together with the image 15a of the jet solder wavefront 15,
The checkpoints 43 and 44 representing the permissible lower limit and upper limit of the variation of the wavefront 15 are checked on the monitor television 33.
Then, while viewing the screen of this television 33, operate the image processing bag M32 to display the wavefront image 15.
Set the checkpoints 43 and 44 at desired positions in relation to a. Checkpoint 43.44
are light area 41 and dark “area 42”.
Although three areas are set in each area, more may be set in each area. The video checker (product name) can monitor up to 20 points.

Checkpoint 43 set in the light area 41
has a dark ([) on switch function, and when the dark area 42 reaches this checkpoint 43, it is turned on to notify that the solder jet wave front 15 has reached the lower limit of tolerance. The checkpoint 44 set in the dark area 42 has a light (bright) on switch ill fl, and when the light area 41 reaches this checkpoint 44, it is turned on and the jet solder wavefront 15 is turned on. Informs you that the allowable limit has been reached.

Then, the jet solder wavefront 15 gradually descends during operation, and the monitor image 15a becomes the light area 4.
When the checkpoint 43 set to 1 is reached, a dark-on occurs, an activation signal is output to the alarm 34, and the administrator is informed that the solder wavefront 15 of the solder jet has reached the permissible limit. Similarly, when the jet solder wavefront 15 gradually rises during operation and the monitor image 15a reaches the checkpoint 44 set in the dark area 42, the light is turned on and an activation signal is output to the alarm 34. Then, the administrator is informed that the jet solder wavefront 15 has reached the permissible limit.

When the jet solder wave front 15 has reached the upper limit, the administrator adjusts the continuously variable transmission to reduce the temperature of the tank body 1.
The rotational speed of the jet pump provided in the jet pump 2 is adjusted to the low speed side, and the wave surface 15 is returned to a downward direction.

If the jet solder wave front 15 has reached the lower limit, the rotational speed of the pump is adjusted to a high speed side by adjusting the continuously variable transmission, etc., and the wave front 15 is raised again.

In addition, by automatically controlling the rotational speed of the pump, the wave height of the wave surface 15 of the jet flow may be automatically controlled.

〔Effect of the invention〕

According to the present invention, an image processing device compares and processes an image of a jet solder wavefront captured by a television camera with checkpoints set as a permissible lower limit and an allowable upper limit of fluctuations in this wavefront, and the image of the wavefront is Since the image processing device outputs a wave height abnormality report when a checkpoint is contacted, the wave height monitoring of jet soldering can be automated, and highly accurate monitoring is possible using the television camera. reliability can be increased. Furthermore, since the checkpoints are set in relation to the image of the wavefront while watching a monitor television, there is an advantage that the checkpoints can be easily set.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the method for monitoring the wave height of a solder jet according to the present invention, and FIG. 2 is a front view showing the screen of a monitor television. 13... Nozzle, 15... Wave front of jet solder, 15a...
・Wavefront image, 31...TV camera, 32...Image processing device, 33...Monitor TV, 43.44...Checkpoint.

Claims (1)

[Claims] (1) A television camera is set to face the wavefront of the molten solder jetting from the nozzle, and the image of the wavefront obtained from this television camera and the checkpoints set as the allowable lower limit and upper limit of fluctuations in this wavefront are imaged. The jet is displayed on a monitor television via a processing device, and when the image of the wave front comes into contact with the checkpoint on the monitor television, the image processing device outputs an abnormal wave height alarm of the jet solder. Method for monitoring solder wave height.