KR20170078429A

KR20170078429A - Device for applying paste

Info

Publication number: KR20170078429A
Application number: KR1020150188942A
Authority: KR
Inventors: 박전용
Original assignee: 박전용
Priority date: 2015-12-29
Filing date: 2015-12-29
Publication date: 2017-07-07
Also published as: KR101778632B1

Abstract

The present invention relates to an apparatus used for applying a functional paste such as an external electrode paste to an outer surface of an electronic component such as a chip resistor, a chip inductor, and a multilayer ceramic capacitor (MLCC). The present invention provides a belt comprising a belt having a coated surface to which a paste is applied, a drive device for intermittently running the belt along a predetermined path, a paste supplying means for supplying a paste to the coated surface of the belt, A thickness adjusting means for adjusting a thickness of the paste supplied to the coated surface of the belt so that a blasting zone is repeatedly formed along the running direction of the belt, And a lift device disposed on the downstream side of the thickness adjusting means and configured to move the head linearly toward the coated surface of the belt when the belt is in a stopped state, The present invention also provides a paste applying apparatus comprising: The paste applying apparatus according to the present invention has an advantage that the time required for development, application and removal of the paste is minimized and the productivity is greatly improved.

Description

[0001] The present invention relates to a device for applying paste,

The present invention relates to an apparatus used for applying a functional paste such as an external electrode paste to an outer surface of an electronic component such as a chip resistor, a chip inductor, and a multilayer ceramic capacitor (MLCC).

The surface of an electronic component such as a multilayer ceramic capacitor (MLCC) or a semiconductor device is provided with an external electrode connected to the internal electrode of the electronic component. The external electrode may be formed by various methods such as a method of dipping an electronic component into a conductive paste, a method of sputtering, a method of vapor deposition, or the like.

Japanese Patent Application Laid-Open Nos. 5-243109 and 7-161592 disclose techniques for forming external electrodes by dipping an electronic component into a conductive paste. The techniques of these patent documents include steps of spreading a conductive paste on a flat board by the operation of a squeegee blade and dipping the developed electronic part into a conductive paste, And an external electrode is formed.

When the paste is applied to the surface of the electronic component only once, it is difficult to obtain an external electrode having a desired shape, and the thickness of the paste to be applied is uneven, resulting in a problem of defects. Therefore, the paste is applied to the surface of the electronic component two to three times while varying the thickness of the developed paste to manufacture the external electrode. However, in this case, since the development of the paste, the application of the paste, and the removal of the paste are repeated two or three times, the lead time is prolonged and the productivity is greatly reduced.

Japanese Patent Application Laid-Open No. 5-243109 Japanese Patent Application Laid-Open No. 7-161592 Published Patent Application No. 10-2010-0035926

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paste applying apparatus which can minimize the time required for development, application and removal of paste, thereby improving productivity.

In order to achieve the above object, the present invention provides a belt comprising: a belt having a coated surface to which a paste is applied; a driving device for intermittently running the belt along a predetermined path; A dipping zone in which the thickness of the paste is different from that of the paste on the application surface and a blotting zone in which a blotting zone is repeatedly formed along the running direction of the belt, A thickness adjusting means for adjusting the thickness of the belt; a head disposed downstream of the thickness adjusting means and having a plurality of objects to be coated fixed thereon; and a head moving mechanism for linearly moving the head toward the coated surface of the belt, And a dipping device provided with a lift device configured to be movable in a vertical direction.

In addition, the thickness adjusting means includes a blade disposed on the downstream side of the paste supplying means and configured to periodically change the distance between the belt and the coated surface of the belt.

Further, there is provided a paste applying device further comprising a collecting means disposed downstream of the lift device for collecting the paste remaining on the coated surface of the belt in contact with the coated surface of the belt.

The paste supply means may include a supply portion for storing the paste collected by the collection means and a paste for storing the paste supplied to the coated surface of the belt, And a paste storage device for storing the paste stored in the receiving device, the paste storage device being configured to move through the filter to the supply part.

The paste applying device further includes a paste supply roller which is disposed between the application surface of the belt and the paste storage container and rotates to supply the paste stored in the paste storage container to the application surface of the belt through the outer peripheral surface thereof.

The apparatus further includes a supporting device disposed to face the elevating device with the belt interposed therebetween and having a supporting surface for fixing the belt in close contact with the belt when the elevating device is lowered do.

Further, a plurality of through holes are formed in the support surface, and the plurality of through holes are connected to the intake and exhaust lines.

Further, there is provided a paste applying device further comprising a fine vibration generating device capable of finely vibrating the paste spread on the coated surface of the belt.

Further, the fine vibration generating device is an ultrasonic vibrator disposed below the supporting surface of the supporting means.

The paste applying apparatus according to the present invention has an advantage that the time required for development, application and removal of the paste is minimized and the productivity is greatly improved. Also, in some embodiments, there is an advantage that defective coating such as void generation is reduced.

1 is a conceptual diagram of an embodiment of a paste applying apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Therefore, the shapes and the like of the elements in the drawings are exaggerated in order to emphasize a clearer description, and elements denoted by the same reference numerals in the drawings denote the same elements.

1 is a conceptual diagram of an embodiment of a paste applying apparatus according to the present invention. 1, an embodiment of a paste applying apparatus according to the present invention includes a belt 10, a driving apparatus, a paste supplying means, a thickness adjusting means, a collecting means, a dipping apparatus 40, a supporting means 80, And a fine vibration generating device (90).

The belt 10 has a coating surface 11, which is the outer surface to which the paste is applied, and an inner surface 12, which is in close contact with the driving device. The belt 10 may be a belt made of a metal material such as SUS or a belt made of resin. The paste refers to a fluid having high viscosity, and is a conductive paste in which a metal powder, a glass frit, a binder and a solvent are mixed, a conductive paste in which a metal powder and an epoxy resin are mixed, an electric insulating property such as a ceramic paste or an epoxy resin composition Various kinds of functional pastes such as paste, adhesive, and solder cream can be used.

The driving device serves to intermittently run the belt 10 along a predetermined path and includes a first roller 20a and a second roller 20b which are disposed apart from each other. When the belt 10 is put on the first roller and the second roller and at least one of the first roller 20a and the second roller 20b is rotated, the belt 10 runs.

In order to control the movement of the belt 10 more precisely, through holes or grooves are formed on both sides of the belt 10, and the first roller 20a and / or the second roller 20b are provided with projections So that the projections can be inserted into the holes or grooves. Further, movement of the belt 10 can be precisely controlled by detecting the groove formed in the belt 10 using a sensor.

The paste supply means serves to supply the paste to the application surface of the belt 10. [ The paste supply means includes a paste storage tube (60) and a paste supply roller (70).

The paste storage container 60 serves to store the paste. The inner space of the paste storage container 60 is divided into a supply portion 61 and a rejection portion 62 by a filter 63. The supply unit 61 is a space in which the paste supplied to the coated surface of the belt 10 is stored. The paste after use is stored in the number rejection 62, passes through the filter 63, and moves to the supply part 61. [ At this time, foreign substances contained in the used paste are removed by the filter 63. When the viscosity of the paste is high, a screw (not shown) connected to the motor can be installed in the rejection 62, and the paste of the rejection 62 can be pushed to the feeder 61.

The paste supply roller 70 is disposed between the paste storage 60 and the application surface 11 of the belt 10. At this time, at least the outer circumferential surface of the paste supply roller 70 is contained in the paste stored in the supply portion 61 of the paste storage box 60. When the paste supply roller 70 rotates, the paste on the outer circumferential surface of the paste supply roller 70 is transferred to the application surface 11 of the belt 10 adjacent to the outer circumferential surface of the paste supply roller 70.

The thickness adjusting means is disposed on the downstream side of the paste supplying means. The thickness adjusting means includes a dipping zone in which the thickness of the paste is different from that of the coated surface 11 of the belt 10 and a belt zone in which a blotting zone is repeatedly formed along the running direction of the belt 10. [ The thickness of the paste supplied to the coated surface 11 of the substrate 10 is controlled. Generally, the paste thickness of the dipping zone D is thick compared to the paste thickness of the blowing zone B.

In this embodiment, the thickness adjusting means includes the blade 30. The blade 30 is installed so as to face the outer circumferential surface of the first roller 20a at the 9 o'clock position of the first roller 20a. The blade may be installed anywhere between the paste supply roller 70 and the upstream dipping device 40a. That is, it can be installed anywhere between the 6 o'clock direction and the 12 o'clock direction of the first roller 20a. The paste supplied onto the coated surface 11 of the belt 10 by the paste supplying means is spread on the coated surface 11 of the belt 10 with a uniform thickness.

The blade is configured to periodically change the gap with the application surface 11 of the belt 10. A dipping zone D is formed on the coated surface 11 of the belt 10 when the belt 10 travels with the blade away from the application surface 11 of the belt 10, When the belt 10 travels in a state in which the blade is close to the application surface 11 of the belt 10 after traveling, a blowing zone B is formed. The thickness of the paste in the dipping zone D and the blotting zone B may be varied depending on the required process conditions and in some cases in the blotting zone B the blades are pressed against the coated surface 11 of the belt 10 So that the paste can be completely removed. In this case, the coated surface 11 of the belt 10 is exposed in the blotting zone B. Generally, the lengths of the dipping zone D and the blotting zone B are the same.

The dipping device (40) is disposed on the downstream side of the blade (30). Although two dipping devices 40 are shown in FIG. 1, the number of the dipping devices 40 may be one, or may be three or more. The dipping apparatus 40 includes a head 41 and an elevating apparatus 42. [ The elevating device 42 may be a linear actuator for linearly moving the head 41. For example, the lift device may be a lead screw linear actuator, a solenoid actuator, a pneumatic cylinder, a pneumatic rodless linear actuator, a rack and pinion mechanism pinion mechanism and the like.

The head 41 is coupled to the elevating device 42. The head 41 holds and fixes the carrier plate C on which a plurality of objects W are mounted. As the carrier plate C, a rubber plate having a plurality of through holes may be used. The objects W to be coated are inserted into the through holes one by one, and the object W to be coated is fixed by the elastic force of the rubber. It is also possible to use a carrier plate C in which a pressure-sensitive adhesive film is adhered to the back surface of a plastic plate having a plurality of through holes. At this time, the object W is fixed by the adhesive film.

The head 41 can fix the carrier plate C by, for example, the action of a clamp unit and can be configured to fix the carrier plate C through vacuum suction.

The supporting means 80 is arranged to face the elevating device 40 with the belt 10 therebetween. The supporting means 80 serves to fix the belt 10 so that it does not move when the elevating device 40 is lowered. The support means 80 may be a vacuum table having a support surface 81 that is in close contact with the inner surface 12 of the belt 10.

A plurality of through holes (not shown) are formed in the support surface 81, and the through holes are connected to the intake line 82 and the gas supply line 83. The intake line 82 may be connected to a vacuum pump, and the gas supply line 83 may be connected to a high-pressure gas supply device. The belt 10 is fixed to the supporting surface 81 by the negative pressure by the intake line 82 when the elevating device 40 is lowered and the positive pressure The belt 10 is separated from the support surface 81 by the support member 80. [

The collection means is disposed on the downstream side of the lifting device 40 and the supporting means 80. [ The collection means is in close contact with the application surface 11 of the belt 10 to collect the paste remaining on the application surface 11 of the belt 10. The collection means may be a squeegee 50 of rubber material. The collected paste falls to the rejection 62 of the paste storage container 60. The collected paste includes particles of the object W to be coated, dust and the like. These foreign substances are removed by the filter 63 in the course of the collected paste passing through the filter 63 and moving to the supply part 61.

The fine vibration generating device 90 serves to cause the paste developed in the dipping zone D to vibrate slightly when dipping. When the paste is micro-vibrated, a vacuum is formed in the process of rising the coating object W at the time of dipping, and it is possible to prevent voids from being generated in the paste applied to the coating object W. As a result, It is possible to prevent the phenomenon that the wafers W come off from the carrier plate C. Further, it is possible to improve the phenomenon that the paste is fully applied to the edge portion of the object W to be peeled off at the edge portion in the subsequent process.

As shown in Fig. 1, the fine vibration generating device 90 may be installed inside the support means 80 near the support surface 81, or may be provided separately on the outside. As the fine vibration generating device 90, an ultrasonic vibrator or the like can be used.

The operation of the above-described paste applying apparatus will be described below.

First, the object W to be coated is loaded on the carrier plate C, and then mounted on the upstream side dipping apparatus 40a and the downstream side dipping apparatus 40b, respectively.

When the first roller 20a and the second roller 20b are rotated, the belt 10 starts to run and the paste stored in the supply portion 61 of the paste storage container 60 Is transmitted to the application surface (11) of the belt (10).

When the coated surface 11 of the belt 10 on which the paste is applied reaches the blade 30, the applied paste spreads to the coated surface 11 of the belt 10 to have a constant thickness and forms the dipping zone D first do. The thickness of the paste in the dipping zone D can be controlled by adjusting the distance between the blade 30 and the application surface 11 of the belt 10. [

When the dipping zone D of the length of the carrier plate C is formed, the belt 10 temporarily stops for the progress of dipping and blotting, which will be described later. In the first cycle, the dipping zone D and the blotting zone B do not stop until the dipping zone D and the blotting zone B move to the position where the dipping unit 40 is installed, It may be formed continuously.

When dipping and blotting are completed, the gap between the blade 30 and the application surface 11 of the belt 10 becomes narrow. Then, the belt 10 starts running again and a blowing zone B is formed. The paste thickness of the blotting zone (B) may vary depending on the process conditions. After the blotting zone B is formed by the length of the carrier plate C, the blade is further away from the application surface 11 of the belt 10 to form a dipping zone D. Then, after a predetermined time has elapsed, the wafer is further lowered to form a blotting zone B. In this way, a blotting zone B is continuously formed between the dipping zones D.

When the application surface 11 of the belt 10 on which the dipping zone D is formed is moved to a position where the downstream side dipping apparatus 40b and the support means 80 are installed, the first roller 20a and the second roller 20b are stopped, and the belt 10 is stopped. A negative pressure is applied to the support surface 81 of the support means 80 so that the inner surface 12 of the belt 10 is attracted to the support surface 81 of the support means 80. [ Then, the elevating device 42b descends, and the end of the object W to be coated is contained in the paste of the dipping zone D. The end of the object W to be coated may or may not touch the coated surface 11 of the belt 10 in accordance with the process conditions. When the elevating device 42b rises, the paste is applied to one end of the object W to be coated. At this time, the fine vibration generating device 90 is activated to prevent voids from being formed on the paste applied to the object W to be coated.

The vacuum of the support means 80 is destroyed and the belt 10 runs again so that the application surface 11 of the belt 10 on which the blowing zone B is formed is positioned at the position where the downstream side dipping apparatus 40b is installed The first roller 20a and the second roller 20b stop, and the belt 10 stops again. When the elevating device 42b descends and then ascends, the blotting is completed. At this time, dipping of the object W loaded on the upstream side dipping apparatus 40a can proceed simultaneously.

When the coated surface 11 of the belt 10 to which the paste 10 has been applied reaches the squeegee 50 as the collection means, the paste is collected by the squeegee 50, (62). The paste collected in the water rejection 62 passes through the filter 63 and moves to the supply part 61. In this process, the foreign substance contained in the paste stored in the rejection 62 is removed.

When the paste is insufficient, a new paste is additionally supplied to the supply part 61 of the paste storage box 60. The paste may be fed through an automatic or manual feeder.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes, modifications, or substitutions may be made, and such embodiments are within the scope of the present invention.

For example, although the filter 63 is shown as being installed in the vertical direction, it may be installed horizontally, be inclined, cupped, or two or more filters of the same mesh size or different It is possible.

Further, although it has been described that the belt is run using two rollers, a roller may be further provided below the support means.

10: Belt 11: Coated surface
20a: first roller 20b: second roller
30: first blade 31: second blade
40: dipping device 41: head
42: lifting device 50: squeegee
60: paste storage container 61: supply part
62: Deny 63: Filter
70: paste feed roller 80: support means
81: support surface 82: intake line
83: gas supply line

Claims

A belt having a coating surface to which a paste is applied,
A drive device for intermittently running the belt along a predetermined path,
Paste supplying means for supplying a paste to the coated surface of the belt,
A dipping zone in which the thickness of the paste is different from the thickness of the paste on the coated surface and a thickness adjusting portion for adjusting the thickness of the paste supplied to the coated surface of the belt so that a blotting zone is repeatedly formed along the traveling direction of the belt Sudan,
A dipping device disposed on the downstream side of the thickness adjusting means and having a head fixed with a plurality of objects to be coated and a lift device configured to linearly move the head toward the coated surface of the belt when the belt is stationary, / RTI >

The method according to claim 1,
Wherein the thickness adjusting means comprises:
And a blade disposed on the downstream side of the paste supplying means and configured to periodically change the gap with the application surface of the belt.

The method according to claim 1,
Further comprising collecting means disposed downstream of the lift device for collecting the paste remaining on the coated surface of the belt in contact with the coated surface of the belt.

The method of claim 3,
Wherein the paste supply means comprises:
And a supply unit for storing paste collected by the collection unit and storing the paste supplied to the application surface of the belt, wherein a filter is installed between the rejection unit and the supply unit, And a paste reservoir configured to pass through the filter to the supply section.

5. The method of claim 4,
And a paste supply roller which is disposed between the application surface of the belt and the paste storage container and rotates to supply the paste stored in the paste storage container to the application surface of the belt through the outer peripheral surface thereof.

The method according to claim 1,
Further comprising a supporting means disposed to face the elevating device with the belt interposed therebetween and having a supporting surface for fixing the belt in close contact with the belt when the elevating device is lowered.

The method according to claim 6,
Wherein a plurality of through holes are formed in the support surface, and the plurality of through holes are connected to the intake and exhaust lines.

The method according to claim 1,
And a fine vibration generating device capable of finely vibrating the paste spread on the coated surface of the belt.

9. The method of claim 8,
Wherein the fine vibration generating device is an ultrasonic vibrator disposed below the supporting surface of the supporting means.