JPH0286868A - Coated film device - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for applying a viscous fluid to an object to be coated, and more particularly to a coating apparatus for applying conductive processing to electronic parts.

Conventional Technologies and Issues Conventionally, the method of conducting conductive processing on various electronic components using conductive paint is to manually immerse each electronic component to be coated in a conductive paint bath, and then coat the surface with A method of forming a coating film is used.

For example, as shown in FIG. 6, the object to be coated (
Electronic component) P is held between tweezers 4 and immersed. In such a method, sufficient paste is not applied to the part of the workpiece P that comes into contact with the tweezers, liquid clumps occur near the tweezers 4, and the bottom of the tweezers and the bottom of the workpiece are not coated with enough paste. Liquid dripping 5 occurs, making it impossible to obtain a uniform coating film. Furthermore, as shown in FIG. 7, there is also a method in which the hole of the object P to be coated is hooked on a jig 6 and the object is immersed in a suspension liquid. In this method, the contact area between the object to be painted P and the jig 6 is small, and uneven coating due to contact between the object to be painted and the jig is reduced. However, liquid blur still occurs at the bottom of the painted electronic component, making it impossible to obtain a uniform coating.

The present invention provides an apparatus that continuously and efficiently forms a uniform coating film when applying a viscous fluid to an object to be coated, especially when applying a highly viscous paste containing metal powder to an electronic component. The purpose is to provide.

Means for Solving the Problems The present invention provides (1) a conveying device equipped with a plurality of jigs for attaching objects to be coated, (ii) a coating liquid tank provided below the jigs, and (iii)
The present invention provides a coating film apparatus comprising:) a jig vibration device for vibrating a jig to which a coated object is attached; and (iv) a drying device for the object to be coated.

Furthermore, the present invention also provides the above-mentioned coating apparatus, which is equipped with a drip removing device that absorbs droplets on the surface of an object to be coated suspended from a jig.

Furthermore, the present invention also provides the above-mentioned coating apparatus in which a jig cleaning device is added downstream of the conveying device to the drying device.

Operation The apparatus of the present invention uses vibration to shake off liquid clumps and liquid blur from the object to be coated, and removes excess liquid from the surface of the object to be coated.

Next, the present invention will be explained in more detail with reference to the accompanying drawings. FIG. 1 is a schematic explanatory diagram showing a specific example of the apparatus of the present invention.

The coating device 100 is equipped with a jig that can attach objects to be coated, and includes a conveyor 10 that moves in the direction of arrow a, a coating liquid tank 20 disposed below the conveyor, and a conveyor that moves in the direction of arrow a. Jig vibration device 30 placed above
, a drip removing device 40, a drying device 50 for the object to be coated, and a jig cleaning device 60.

The conveyance device IO includes a jig conveyor 12 as shown in FIG.
The jig conveyor 12 carries objects to be painted (electronic parts).
Equipped with a large number of J-shaped jigs 1■ for attaching P. The conveyor 12 can move approximately horizontally in an oval shape in the conveying direction a (in FIG. 2, perpendicular to the paper surface). Note that the rotational movement of the conveyor is performed by a drive device (not shown) controlled by a control device.

In addition to the 3-shaped jig shown in this example, the shape of the jig was appropriately designed according to the shape of the object to be coated so that the object to be coated could be taken out or placed, such as one with a tapered hole. can be used.

Coating liquid! '! 20 is provided at a predetermined position below the level of horizontal movement of the jig 11, and fills the tank with noble metal paste for conductive processing of the surface of the electronic component.

The coating liquid tank 20 is moved up and down by a lifting device (not shown).
The object to be painted P suspended on the jig 11 is painted.

The vibration device 30 is composed of a plurality of hexagonal rotary cams 31 arranged in an area extending from above the coating liquid tank 20 to the top of the conveyor 12 slightly downstream of the coating liquid tank 20. 12 and jig Ill
This gives a vibration of the same amplitude (see Figure 3). In order to apply vibration to the jig 11, a cam having another suitable shape may be rotated, or another suitable known vibration generating device may be used.

Next, the liquid drip removal device 40 is provided at a lower part of the coating liquid tank 20 downstream of the jig conveyor 12 in the conveying direction. As shown in FIG. 4, this device consists of a drip removal plate 41 whose upper surface is covered with an absorbent and flexible material, and a lifting arm 43 operated by an air cylinder 42. The surface of the removal plate 41 for wiping liquid blur at the bottom of the object to be painted P is preferably covered with cloth, paper, or other absorbent material, and after use, it is preferable to incinerate it to recover the precious metal. In addition to an air cylinder, any known lifting device may be used to lift and lower the drip removal plate 41. In addition to the liquid drip removal device shown in Figure 4, which wipes the droplets by bringing a cloth directly close to the object to be painted, there are also devices such as an air sucker that has a suction port near the object to be painted. may be any suitable device that absorbs the droplets.

The drying device 50 for the object to be coated is provided further downstream of the drip removing device 40 in the transport direction a of the conveyor. As the drying device, any conventionally known hot air dryer, far-infrared dryer, etc. can be used. Note that a cooling device 51 for the object to be coated is arranged further downstream of the drying device 50.

The jig cleaning device 60 is provided further downstream of the product take-out section B following the cooling device 51. As shown in FIG. 5, the cleaning device includes a cleaning tank 61 that can be moved up and down and a cleaning brush 62 that is rotatably provided within the cleaning tank. The sixth cleaning tank is filled with a solvent for dissolving and removing the noble metal paste attached to the jig 11. A jig drying device may be further provided behind the cleaning tank 61.

Incidentally, the timing of the rotational movement of the transport conveyor, the raising and lowering of the coating liquid tank 20 or the jig cleaning tank 61, the operation of the liquid drip removal device 40, etc. can be controlled by an appropriate control mechanism. .

Further, the conveyor 12 of this embodiment moves almost horizontally, and the coating liquid tank, drip removal device, etc.
Alternatively, the cleaning tank rises to perform coating, remove drips, and clean the jig, but conversely, the conveyor is moved diagonally downward at a predetermined position and brought into contact with the coating liquid, drip removal plate, or cleaning brush. It's okay.

Next, a method of painting using the apparatus of the present invention shown in the above specific example will be explained.

First, a predetermined number of objects to be coated (electronic components) P are hung in the product loading section A. Such electronic components include a variety of electronic components, such as frequency filters, that require a conductive viscous (approximately 30 cps or higher) blue metal paste (conductive paint) to be coated on the outer surface. The electronic component is moved above the coating liquid tank 20 by the movement of the conveyor 12 and then stopped. Next, the coating liquid tank 20 is raised by the operation of the elevating device to immerse the object to be coated in the paste, thereby performing immersion.

As the paste, any conventionally known noble metal paste can be suitably used, such as a silver paste consisting of silver powder, binder resin, glass frit, etc., or a paste using copper powder or silver-nisokel blend powder instead of silver powder. It will be done.

After the immersion is completed, the coating liquid tank 20 is lowered, and then the vibrating device 3
0 operates and vibrates the jig 11. This vibration removes liquid clumps and liquid blur on the surface of the object to be coated or between the object to be coated and the jig, and excess noble metal paste drips into the coating liquid tank 20. In addition, the vibration moves the area before contact between the jig 11 and the object to be coated P, resulting in a more uniform coating film. By providing such a vibrating device, it becomes possible to uniformly and accurately apply a relatively high viscosity conductive paint such as metal paste.

Further, the conveyor 12 moves in the direction of arrow a and stops above the drip removal device 40. Next, lift arm 43
As a result of the operation, the liquid drip removal plate 41 rises, wipes the liquid dripping from the lower part of the object to be coated P, and collects the precious metal.

The object P to be coated on which a uniform coating film has been formed is introduced into the drying device 50 as the conveyor 12 moves, and is dried for 5 to 10 minutes at 100 to 150° C. depending on the coating film. The painted electronic components that have been completely dried are cooled by the fan of the cooler 51, and then removed from the jig 11 at the product removal section B.

The jig 11 from which the electronic components have been removed is further moved by the movement of the conveyor 12 and positioned above the jig cleaning device 60 . Next, the cleaning tank 61 is raised and the paste adhering to the surface of the jig is washed off by rotation of the cleaning brush 62.

The jig 11 cleaned in this way is further conveyed to the conveyor 1.
2. As it moves, it returns to the original product input section A, and the same operation is repeated thereafter.

Incidentally, the attachment of the electronic parts to be painted and the removal of the painted parts may be carried out either manually or automatically.

Furthermore, the coating performed by the device of the present invention is not limited to coating electronic components with precious metal paste, but also applies a relatively viscous fluid to a large number of objects to be coated with a uniform coating. Any of these can be suitably employed when provided.

Effects of the Invention According to the apparatus of the present invention, the formation of a coating film on an object to be coated, especially the application of noble metal paste to electronic components, is carried out continuously and uniformly, thereby improving the performance and productivity of electronic components. It becomes possible.

Furthermore, by providing a drip removal device, the coating film becomes more uniform.

Furthermore, by providing a jig cleaning device, there is no accumulation of paint on the jig.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing a specific example of the device of the present invention, and FIG.
The figure is an elevation view showing the vibrating device, FIG. 3 is a front view of FIG. 2, FIG. 4 is an elevation view of the liquid drip removal device, and FIG. FIGS. 6 and 7 are explanatory diagrams showing a conventional coating method. The main symbols in the figure are as shown. 10: Conveyance device, 11: Jig, 12: Conveyor, 20:
Coating liquid tank, 30: Vibration device, 40: Liquid drip removal device, 5
0: drying device, 60: jig cleaning device, P object to be coated. Patent Applicant Daiken Chemical Industry Co., Ltd. Representative Patent Attorney Hiroshi Morioka Figure 4 Figure 5 bz EtE+ 7-ra! / Figure 6 Figure 7

Claims (3)

[Claims] (1) (i) A conveying device equipped with multiple jigs for attaching objects to be coated, (ii) A coating liquid tank provided below the jigs, (iii) A conveyor device equipped with a plurality of jigs for attaching objects to be coated, (iii) A transfer device equipped with a plurality of jigs for attaching objects to be coated; A coating film apparatus comprising: a jig vibration device for vibrating a jig; and (iv) a drying device for an object to be coated. (2) The coating apparatus according to claim 1, further comprising a drip removing device for absorbing droplets on the surface of the object to be coated suspended from the jig. (3) The coating device according to claim 1 or 2, further comprising a jig cleaning device provided downstream of the conveying device with respect to the drying device.