JPH04367760A - Emission type drawing apparatus - Google Patents

Abstract

PURPOSE:To obtain a stable emission amount and drawing of high accuracy constant in flow, in an emission type drawing apparatus forming a thick film, by adjusting the apparent viscosity of emitted paste. CONSTITUTION:An emission type drawing apparatus is constituted by providing a vibration generating part 8 imparting vibration to the pasty material 4 in both of a tank 2 and a nozzle 3 and a controller 9 sending signals of amplitude and vibration frequency to the vibration generating part 8 and the viscosity of emitted paste is adjusted to make it possible to perform the stable drawing of a line.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge type drawing apparatus for forming thick film circuits.

0002

2. Description of the Related Art In recent years, discharge type drawing apparatuses have been introduced into the manufacturing process of thick film circuits because they are easy to manage based on data and are advantageous for high-mix, low-volume production.

FIG.
This will be explained with reference to FIG. As shown in the figure, the drawing head section 1 holds a tank 2, and a nozzle 3 having a discharge hole is integrally formed at the tip of the tank 2, and a paste material 4 (hereinafter referred to as paste) is housed inside. , vertical movement is possible. An air pipe 5 for supplying pressurized air for discharging paste is connected above the tank 2, and a table 6 movable in the X and Y directions shown in FIG.
A substrate 7 on which a thick film circuit is formed is held.

[0004] The operation of the discharge type drawing apparatus constructed as described above will be explained. The tank 4 was held in order to bring the tip of the nozzle 3 to a position that maintained an appropriate gap a to obtain the film thickness of the circuit line to be drawn with respect to the substrate 7 held on the table 6. Lower the head part 1. After the gap between the upper surface of the substrate 7 and the tip of the nozzle 3 becomes a, the lowering operation of the head section 1 is stopped. Thereafter, processing air for paste discharge is supplied through the air pipe 5, and the paste 4 is discharged onto the substrate 7 from the discharge port of the nozzle 3. Further, the table 6 moves in the X and Y directions in accordance with the drawn line to form the required line on the substrate 7. After the line formation is completed, the supply of processing air for paste discharge from the air pipe 5 is stopped, and the supply of paste 4 from the discharge hole of the nozzle 3 is stopped. Thereafter, the nozzle 3 is raised above the substrate 7 by raising the head portion 1 . By repeating the above series of line drawing operations, a required circuit, which is a collection of lines, is formed.

[0005]

Generally, when forming a circuit, it is necessary to use various pastes 4 depending on the shape of the pattern and its purpose. In addition, when forming a pattern, in order to form a stable linear pattern, that is, a pattern consisting of lines with stable line width and film thickness, first, the discharge flow of the paste 4 discharged from the nozzle 3 and the The discharge amount must be stabilized. On the other hand, different types of paste 4 have physical properties, particularly viscosity and thixotropy (in the case of pastes for electronic circuits, the apparent viscosity of the paste changes depending on the magnitude of shear stress applied to the paste; Since the ratio of viscosity at each shear stress is called the thixotropic ratio), the discharge conditions are different, and the stability of the discharge amount is also different. Furthermore, some pastes have such high viscosity that they cannot be discharged from the nozzle discharge holes within the capacity of the pressurized air for discharge of the equipment. Furthermore, conventionally, the amount of paste 4 to be discharged has been adjusted mainly by changing the air pressure for discharge, or by changing the nozzle movement speed during discharge drawing. Adjustment of the discharge air pressure is mainly dependent on manual labor, and even with electrical control, control to stabilize the discharge air pressure has been extremely difficult. Furthermore, when changing the nozzle moving speed, the speed must be reduced especially for high viscosity pastes, leading to a decrease in productivity.

The present invention solves the above problem, and even if the viscosity and thixometry ratio of the paste differs, the apparent viscosity of the paste to be discharged can be adjusted and a stable discharge amount can be obtained. In addition, even with past pastes that have a high viscosity and cannot be discharged with the capabilities of a discharge type drawing device, making drawing impossible, the apparent viscosity can be lowered and drawing can be performed. Furthermore, it is an object of the present invention to provide a discharge type drawing device that digitally adjusts the amount of paste discharged, manages paste discharge with high precision, and is capable of performing highly accurate drawing.

[0007]

[Means for Solving the Problems] The present invention includes a tank containing a paste-like material therein, and a nozzle located at the tip of the tank and having a discharge hole for the paste-like material, the tank and the nozzle The tank and the nozzle are provided with a vibration generating section that can apply vibration to the paste-like material inside and change the apparent viscosity of the paste.

[0008]

[Operation] In the above-described structure, the present invention applies vibration to the paste in the tank and nozzle through the tank and nozzle by the vibration generating section, applies shear stress to the paste, and adjusts the apparent viscosity of the paste.

[0009]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that the same numbers are used for the same constituent members as those explained in the conventional example.

As shown in the figure, the difference from the conventional example is that a vibration generating section 8 made of, for example, a piezoelectric element is attached to the nozzle 4, and a vibration generating section controller 9 is connected to it. Therefore, the explanation of the same parts of the operation as in the conventional example will be omitted.

A vibration generating unit controller 9 sends a signal to a vibration generating unit 8 attached to the outer periphery of the nozzle 3 and a part thereof to generate vibration, thereby applying vibration to the paste 4 before being discharged through the nozzle 3. By applying shear stress to the paste 4, the apparent viscosity of the paste is lowered. If drawing is performed while discharging after the viscosity of the paste 4 has entered the stable ejection range unique to the nozzle, stable ejection with a constant ejection amount and ejection flow can be performed, and a stable drawing linearity can be obtained. In addition, if you wish to perform drawing using paste 4, which cannot normally be discharged within the range of the pressurized air capacity of the equipment, in order to utilize the thixotropy inherent in the paste,
A signal is sent from the vibration generator controller 9 to the vibration generator 8 attached to the outer circumference of the nozzle 3 and a part thereof.
The paste 4 before being discharged through the nozzle 3 by generating vibrations
vibration is applied to the paste 4, thereby applying shear stress to the paste 4. As a result, the viscosity of the paste 4 falls into the ejectable viscosity range and further into the viscosity range suitable for drawing. If the paste 4 is discharged and drawn after the paste 4 is in such a state, linear drawing with a stable discharge amount and flow can be performed.

Furthermore, this apparatus can also use the following drawing method. In other words, the head part 1 holding the tank 2 is lowered with respect to the substrate 7 held on the table 6, and is placed at a position where an appropriate gap a is maintained to obtain the film thickness of the circuit line to be drawn. Move the tip of nozzle 3. After that, pressurized air for discharging the paste is supplied as back pressure through the air pipe 5, and a constant back pressure is applied to the outer periphery of the nozzle 3 and a part thereof within a range where the paste 4 does not come out from the discharge hole of the nozzle 3. Attached vibration generator 8
Then, vibration is generated by sending amplitude and frequency signals from the vibration generator controller 9, and vibration is applied to the paste 4 before being discharged through the nozzle 3, thereby applying shear stress to the paste 4 and changing the apparent appearance of the paste 4. Lower the viscosity and make it a viscosity that allows for the appropriate amount of discharge.

[0013] When the viscosity of the paste 4 decreases, discharge starts due to back pressure. After starting the discharge, while electrically and digitally adjusting the viscosity of the paste 4 using the vibration generator 8,
It moves in the Y direction and forms the required lines on the substrate 7. After the line formation is completed, the supply of air for back pressure from the air pipe 5 is stopped, and the discharge of the paste 4 is stopped. Thereafter, the nozzle 3 is raised above the substrate 7 by raising the head portion 1 . By repeating the above series of operations, a required circuit, which is a collection of lines, is formed.

[0014]

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, even if the viscosity and thixometry ratio of the paste used for drawing differs, the paste can be applied within the paste viscosity range that can be stably discharged, which is unique to the drawing nozzle. Viscosity can be adjusted. Furthermore, it is also possible to draw a paste with a high viscosity, which was previously impossible to discharge. Therefore, it is possible to draw pastes with a wider range of viscosity than before, and it is also possible to draw stable lines with constant line width and film thickness.In addition, the amount of paste discharged can be digitally controlled to control paste discharge with high precision. do,
High-precision drawing is possible.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a discharge type drawing device according to an embodiment of the present invention.

[Fig. 2] Partial perspective view of the same discharge type drawing device

[Figure 3] Side sectional view of a conventional discharge type drawing device

[Fig. 4] Partial perspective view of the same discharge type drawing device

[Explanation of symbols]

2 Tank 3 Nozzle 4 Paste material 8 Vibration generating part 9 Vibration generator controller

Claims (2)

[Claims] Claims: 1. A tank containing a paste-like material therein; a nozzle located at the tip of the tank and having a discharge port for the paste-like material; A dispensing type drawing device having means capable of applying vibration to a paste-like material and changing the apparent viscosity of the paste when discharging it. 2. A method for adjusting the means for applying vibration to the paste material in the tank and the nozzle in order to change the viscosity of the paste material in the tank and the nozzle and control the discharge state of the paste. 1. The discharge type drawing device according to 1.