JPH0451902Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] By positioning the tip of the needle of a syringe held at a predetermined location directly below the member to be coated, paste is sprayed from the tip of the needle, and the paste is applied. The purpose of the present invention is to provide a sensor for detecting the spraying of paste and an output of the sensor, with the aim of eliminating coating defects due to dry spraying or drooping and ensuring reliable coating with respect to the paste coating device formed as described above. The apparatus is configured to include a swinging mechanism that swings the syringe in the vertical direction when the injection time exceeds a predetermined time based on a signal.

[Industrial application field]

The present invention is a paste agent formed so that the paste agent is sprayed from the tip of the needle by positioning the tip of the needle of a syringe held at a predetermined location directly below the member to be coated, and the paste agent is applied. The present invention relates to a coating device.

For printed circuit boards used in electronic devices, a thermally conductive paste is applied to the surface of the electronic components mounted on the printed circuit board, and by interposing the paste, the cooling element is brought into close contact, improving the heat dissipation effect. This is done to increase cooling efficiency.

Application of such a paste agent is required on each surface of the electronic components mounted on the printed circuit board, resulting in an enormous amount of work.

Therefore, in order to reduce such coating work, there is a need for a paste coating device that automatically coats the paste.

[Conventional technology]

Conventionally, the structure was as shown in the conventional block diagram in FIG. 5 and the conventional main part side views in FIGS. 6A and 6B.

As shown in FIG. 5, a needle 5 of a syringe 4 held by a holding member 6 is attached to the surface of an electronic component 3 mounted on a printed circuit board 2 placed on an Paste agent 13
is sprayed so that a predetermined amount of paste 13 is applied to the surface of electronic component 3.

Further, the X-Y table 1 is moved in the X-Y direction by a drive section 9 controlled by a control section 11, and a paste agent 13 is stored in a syringe 4.
The stored paste agent 13 is configured to be injected from the tip of the needle 5 by compressed air sent out through a pipe 15 from a dispenser 10 controlled by a control section 11.

Therefore, first, the electronic component 3, which is the member 12 to be coated with the paste 13, is moved by the X-Y table 1, and a predetermined electronic component 3 is positioned directly below the tip of the needle 5. Then, the paste 13 is sprayed from the tip of the needle 5 by sending out compressed air from the dispenser 10, and a predetermined amount of the paste 13 is applied to the surface of the electronic component 3 by this spray.

Therefore, by repeating the movement of the X-Y table 1 and the spraying of the paste 13, a predetermined amount of the paste 13 is applied to the surface of each electronic component 3.

[Problem that the invention attempts to solve]

However, since such a paste agent 13 has a high viscosity, as shown in FIG. In this case, if the X-Y table 1 is transferred in the direction shown by the arrow, the sagging portion C will be coated on areas other than the surface of the electronic component 3, as shown by the dotted line. Become.

Further, as shown in FIG. 6b, if air bubbles 20 are generated in the paste 13 contained in the syringe 4, the paste 13 will not be sprayed even if compressed air is sent out from the dispenser 10.

Therefore, in either case, there is a problem that a predetermined amount of the paste agent 13 is not applied to the surface of the electronic component 3.

Therefore, an object of the present invention is to eliminate coating defects due to spraying or drooping and to ensure reliable coating.

[Means for solving problems]

FIG. 1 is an explanatory diagram of the principle of the present invention.

As shown in FIG. 1, a sensor for detecting the injection of the paste agent and a swinging mechanism that swings the syringe in the vertical direction when the injection time exceeds a predetermined time based on the output signal of the sensor are provided. Configure it as follows.

With this configuration, the above-mentioned problems are solved.

[Effect]

That is, by providing a sensor that detects the paste injection, the state of the paste injection can be monitored based on the output signal of the sensor.In particular, in the case of drooping where the injection time is long, a vertical swing mechanism is used to monitor the paste injection status. It is designed to prevent the paste from sagging by swinging the syringe.

Therefore, it is possible to detect abnormal injection due to dry injection and drooping as described above based on the output signal, and it is possible to prevent incomplete application of the paste agent.

〔Example〕

The present invention will be explained in detail below with reference to FIGS. 2, 3, and 4. FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a flowchart of the present invention, and FIG. 4 is a side view of essential parts of the present invention. The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 2, a sensor 8 is provided at the tip of the needle 5 to detect the injection of the paste 13, and the syringe 4 is held by the holding member 6 via the swing mechanism 7. The rest of the configuration is the same as described above.

Further, the detection signal T of the sensor 8 is sent to the control unit 11, and the swinging mechanism 7 includes an actuator 7A driven by a drive signal S3 from the control unit 11, and a holding member 6, as shown in FIG. It is formed by a slider 7C fixed to the slider 7C and a block 7B that slides along the slider.The syringe 4 is locked to the block 7B, and the syringe 4 is swung in the direction of the arrow by driving the actuator 7A. It is formed so that

Therefore, the X-Y table 1 is moved by the drive unit 9, and a predetermined electronic component 3 of the printed circuit board 2 is positioned directly below the needle 5, so that a signal S2 is output to the dispenser 10, and the dispenser 1
0, compressed air passes through the pipe 15 to the syringe 4.
sent to.

By sending out this compressed air, the paste agent 13 is injected from the tip of the needle 5, and the paste agent 13 is applied to the surface of the electronic component 3.

In this case, if the injection of the paste agent 13 is normal, the detection signal T of the sensor 8 is
A pulse signal of a predetermined width can be obtained by momentarily passing the pulse signal.

Therefore, by obtaining a pulse signal of a predetermined width, the control section 11 outputs a signal S1 to the drive section 9, and moves the electronic component 3 to be coated next so that it is positioned directly below the needle 5. , and thereafter, the paste agent 13 is applied to each electronic component 3 by repeating the same process.

However, as shown in FIG. 4, when the injected paste 13 is in a drooping state, the detection signal T output from the sensor 8 is connected to the OFF state.Therefore, the output signal S3 drives the actuator 7A. By vertically moving the syringe 4 up and down, this hanging of the paste agent 13 is cut off.

Therefore, since the hanging of the paste agent 13 is cut off, the detection signal T becomes ON state.
It is possible to move on to the next operation.

Such control can be performed as shown in the flowchart of FIG.

First, a predetermined electronic component 3 is positioned directly below the needle 5 by positioning by moving the X-Y table 1, and an output signal S2 is sent from the control section 11.
The paste agent 13 is sprayed.

This injection is confirmed by the detection signal T of the sensor 8, and if the injection is not confirmed by the detection signal T, that is, if there is a dry injection due to air bubbles, etc., in this case, the alarm output will to stop the drive of the device.

When the injection is confirmed by the detection signal T, the completion of the injection is confirmed again by the detection signal T after a predetermined time has elapsed. In this case, the end of the injection is not confirmed, that is, in this case, the paste agent 13 is hanging down at the tip of the needle 5, so the swinging mechanism 7 is driven, and the subsequent Check the detection signal T. As a result, if the completion of injection is not confirmed, the drive of the device is stopped by outputting an alarm.

However, if the end of the spraying is confirmed, if there is an instruction for the next coating, the X-Y table 1 will be moved to perform the same spraying, and if there is no instruction for the next coating, the device will not be driven. It will stop and the coating work will be completed.

Therefore, with this configuration, it is possible to prevent the coating from not being applied due to idle spraying, and to prevent coating to areas other than the surface of the electronic component 3 due to drooping during spraying.

[Effect of idea]

As explained above, according to the present invention, dry injection and drooping of the paste agent can be detected based on the detection signal of the sensor, and in the case of drooping, the drooping can be eliminated by driving the swinging mechanism. can.

Therefore, coating can be performed more reliably than in the past, and reliability can be improved, resulting in great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the principle of the invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a flowchart of the invention, Fig. 4 is a side view of the main parts of the invention, Fig. 5 The figure is a conventional block diagram, a and b in Fig. 6.
shows a side view of a conventional main part. In the figure, 1 is an XY table, 4 is a syringe, 5 is a needle, 6 is a holding member, 7 is a swing mechanism, 8 is a sensor, 12 is a member to be coated, and 13 is a paste agent.

Claims (1)

[Claims for Utility Model Registration] A syringe 4 held in a predetermined position by a holding member 6 and containing a paste 13, and a member 12 to be coated immediately below a needle 5 that injects the paste 13 from the syringe 4. The paste application apparatus is equipped with an X-Y table 1 that moves the paste so that the needle 5 is positioned, and a predetermined amount of the paste 13 is sprayed onto the member 12 from the tip of the needle 5. A sensor 8 that detects the injection of the paste agent 13
When the injection time according to the output signal T of the sensor 8 exceeds a predetermined time, the syringe 4 is moved in the vertical direction A.
A paste application device characterized in that it is provided with a swinging mechanism 7 for swinging the paste agent.