JPH0415327Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a coating device, and more particularly to a coating device used for manufacturing electronic components such as multilayer ceramic capacitors and tantalum capacitors.

BACKGROUND TECHNOLOGY For example, a multilayer ceramic capacitor is produced by laminating and firing a plurality of ceramic sheets 2, 2, etc. on which internal electrodes 1, 1, etc. are adhered, as shown in FIG. A conductive material such as Ag paste is applied to both end surfaces of the chip 3 (hereinafter simply referred to as a chip) to form external electrodes 4, 4, which are electrically connected to the internal electrodes 2, 2, . . . . Furthermore, lead wires 5, 5 for external extraction are connected to the external electrodes 4, 4.
are connected with solders 6, 6, and the main part including the chip 3 is molded with a thermosetting exterior resin material 7 such as epoxy resin.

The above-mentioned lead wires 5, 5 are attached in the production of the above-mentioned multilayer ceramic capacitor, as shown in FIG. 10. As shown in FIG. line 5,
5... First and second chain leads 10, 11 in which the lead wires 5, 5... are held hanging down in an aligned state by caulking and fixing one end 5a, 5a...
A superimposed version of these is used. Each lead wire 5 of the first and second chain leads 10 and 11,
The chips 3, 3, . . . on which the external electrodes 4, 4, .

In the above-mentioned lead wire installation, the first and second
Each lead wire 5, 5 of the chain lead 10, 11
A predetermined amount of cream solder is applied to the free ends 5b, 5b, . . . , and the chips 3, 3, . . . having external electrodes 4, 4, . These first and second chain leads 10, 11
For applying cream solder to each lead wire 5, 5..., a dedicated frame-shaped jig 12 as shown in FIGS. 11 to 13 is used, for example. This jig 12
As shown in the figure, two
Support rods 13,
It is a frame-shaped thing connected by 13, and the side plates 12a,
Concave grooves 14, 14... are formed at a fixed pitch on the upper end surface of 12a.
...is being formed. When applying the cream solder, both ends of the first chain lead 10 or the second chain lead 11 are fitted into the grooves 14, 14 of the side plates 12a, 12a of the jig 12. chain lead 10,10
...or the second chain lead 11, 11...
are removably stored in parallel in the jig 12. and,
As shown in FIG. 14, a liquid tank 16 containing cream solder 15 is fixedly arranged below the jig 12, and one support rod 13 of the jig 12 is rotatably pivoted by an appropriate means. support In this state, by swinging the jig 12 using one of the support rods 13 as a fulcrum, each lead wire 5, 5... of the first chain lead 10, 10... or the second chain lead 11, 11... The free ends 5b, 5b... of... are dipped in the cream solder 15 of the liquid tank 16 to support the
Move the above lead wires 5, 5 up and down by about 1.0mm...
A predetermined amount of cream solder 1 is applied to the free ends 5b, 5b...
Apply 5.

Problems to be Solved by the Invention As mentioned above, in the production of multilayer ceramic capacitors, cream solder is applied to the lead wires 5, 5... by manually swinging the jig 12, A person visually checks the state of cream solder adhesion to the free ends 5b, 5b... of each lead wire 5, 5... and moves the lead wires 5, 5... up and down several times according to the adhesion state. It's on. Therefore, when trying to apply the cream solder 15 in a predetermined shape and amount to the lead wires 5, 5..., it requires skill on the part of the operator and takes time to apply, making it difficult to apply cream solder uniformly and in mass production. There was a problem in that the performance and workability were significantly reduced.

Means for Solving the Problems The present invention was proposed in view of the above problems, and aims to facilitate the realization of automatic mechanization in coating work, and provides technical means for solving the above problems. consists of a vertically movable frame-shaped support to which a frame-shaped jig is removably mounted, in which a plurality of strip-like holders, each of which has a large number of lead wires suspended in an aligned state, are housed in parallel, and the support. A liquid tank disposed below the lead wire and containing a paste-like conductive material to be applied to the lower end of the lead wire, and a mounting base on which the liquid tank is placed are positioned and fixed on the support body. The device is equipped with a drive mechanism that causes minute vibrations in the vertical direction.

Effect: As with the above technical means, by automatically slightly vibrating the liquid tank in the vertical direction with respect to a fixedly positioned support using a drive mechanism, the lower end of each lead wire suspended from the support is It becomes possible to uniformly apply the conductive material to the area, and the above-mentioned problems can be easily solved.

Embodiment An embodiment of the coating apparatus according to the present invention will be described with reference to FIGS. 1 to 8. Figures 9 to 1
The same parts as in FIG. 4 are given the same reference numerals, and their explanations will be omitted. Fig. 1 shows a front sectional view of the coating device of the present invention, and Fig. 2 shows a side sectional view of the coating device. It is a frame-shaped support body that removably houses the jig 12 shown in FIG.
As shown in the figure, concave grooves 18a, 18a of support stands 18, 18, fixed near the four corners of support body 17.
This is done by fitting the support rods 13, 13 of the jig 12 into... Further, although not shown, the support body 17 is arranged to be vertically movable via a screw screw and a plurality of guide rods provided upright on the base 19. A liquid tank 20 is disposed below the support 17, and a paste-like conductive material, such as cream solder 15, is contained in the liquid tank 20. Reference numeral 21 denotes a mounting base on which the liquid tank 20 is placed, and this mounting base 21 is attached to the shelf plate portions 2 of projecting walls 22, 22 that are erected on the base 19 along the left-right direction in FIG.
Timing belt 24, 2 sliding on 3, 23
It is placed on 4. Timing belt 2 above
4 is wrapped around pulleys 25, 25 for transporting the liquid tank, which are driven when leveling the liquid level in the liquid tank 20, which will be described later. 26 is a cam drive motor fixed to the lower part of the base 19 via an L-shaped metal fitting 27; 28 is a cam drive motor fixed to the bottom of the base 19;
A shaft 28 is rotatably installed on the shaft 28 via support members 29, 29, and a pulley 30 is fixed to the approximate center of the shaft 28, and the motor 26
A timing belt 32 is wrapped around a pulley 31 fixed to an output shaft 26a. 3
3, 33 are eccentric cams attached to both ends of the shaft 28; 34, 34 are eccentric cams 33, 33;
These rollers 34,
34 to the mounting base 21, as shown in FIG.
The bearings 36, 36 formed therein are fixed to the lower surface of the mounting base 21, and the shaft portions 34a, 34a of the rollers 34, 34 are fitted into the V grooves 35, 35 of the bearings 36, 36,
This is done by sandwiching it between bearing holders 37, 37 fixed to the bearings 36, 36, thereby setting the rotation axes of the rollers 34, 34 horizontally. A transmission pulley 38 is fixed near the center of the shaft 28, and a timing belt 39 wrapped around the pulley 38 transmits the driving force of the motor 26 to other eccentric cams. A micro switch 40 is placed at a predetermined position via a support frame 41 erected on the base 19 and is electrically connected to the motor 26. Turning on the micro switch 40 sets the motor 26 to start driving. has been done. Further, in FIG. 2, reference numeral 42 denotes a stopper for regulating the transfer end of the liquid tank 20 when leveling the liquid level in the liquid tank 20, which will be described later.
is attached to the base 19 via a mounting bracket 43 having an L-shaped cross section.
It is provided above and comes into contact with a stopper receiver 44 fixed to the end of the mounting base 21 during position regulation. 45
is a positioning stopper mounted on a support frame 46 erected on the base 19 so as to be movable up and down. It is biased downward by a spring 48 stretched between.

The application of cream solder to the lead wires 5, 5, . . . using the application device having the above configuration will be described below. First, the liquid tank 20 in the state of FIGS. 1 and 2 is as follows.
The figure shows the lowest position of the vertical minute vibration caused by the eccentric cams 33, 33, and at this time, the mounting base 21 on which the liquid tank 20 is placed is placed on the timing belt 24. The liquid tank 20 at the lowest position is detected by an appropriate means, and the positioning stopper 45 is operated to protrude based on the detection signal, and the mounting base 21 is held between the positioning stopper 45 and the stopper 42. . This is because when the eccentric cams 33, 33 generate minute vibrations, the mounting base 21 floats up from the timing belt 24, and the mounting base 21 moves to the eccentric cam 3.
3, 33 and the rollers 34, 34 are supported by point contact and are unstable, and this is to prevent positional deviation due to this.

In this state, the jig 12 stores a plurality of first or second chain leads 10, 11... in parallel.
is attached to the support body 17 via the support stands 18, 18, . . . Then, as shown by the chain lines in the figure, the support 17 is lowered via a screw screw and a guide rod (both not shown), and each lead wire 5, 5... of the first or second chain lead 10, 11...
The free ends 5b, 5b... of the support 17 are in contact with the liquid surface of the cream solder 15 in the liquid tank 20.
Position and stop. The support body 17 stopped at this position is sensed by an appropriate means, and the micro switch 40 is set to the ON state. The motor 26 is driven by turning on the micro switch 40, and the driving force of the motor 26 is applied to the pulley 31 - timing belt 32 - pulley 30 - shaft 2.
8-pulley 38-timing belt 39 to the eccentric cams 33, 33... to rotate the eccentric cams 33, 33.... This eccentric cam 3
3, 33..., the rollers 34, 34 on the lower surface of the mounting base 21 rotate while contacting the circumferential end surfaces of the eccentric cams 33, 33.... This allows the fifth
As shown in Figures a, b, and c, the liquid tank 20 is moved vertically, for example, by 0.5 to 1.0, with respect to each lead wire 5, 5... of the first or second chain lead 10, 11 that is positioned and fixed. Apply cream solder 15 to the free ends 5b, 5b, . . . of each of the lead wires 5, 5, . After microvibrating a predetermined number of times, driving of the motor 26 is stopped and the liquid tank 20 is returned to the lowest position, thereby setting the liquid tank 20 to the above-mentioned initial state. After that, when the support body 17 is raised, each lead wire 5, 5 of the first or second chain lead 10, 11... as shown in FIG. 5d.
A predetermined shape and predetermined amount of cream solder 15 is applied to the free ends 5b, 5b, . do. After that, by repeating the above operation, the lead wires 5, 5
Application of cream solder to ... is performed sequentially.

After completing the cream solder application described above, the liquid tank 20
If unevenness occurs on the liquid surface of the cream solder 15 inside, the liquid level is leveled in the following manner. That is, after the cream solder application is completed, the mounting base 2 of the liquid tank 20 returns to the initial state and is at the lowest position.
1 is placed on the timing belt 24.
Therefore, as shown in FIG. 6, by rotating the liquid tank transfer pulleys 25, 25, the timing belt 2
4 and transport the liquid tank 20 and the mounting base 21. At this time, as described above, the protruding positioning stopper 45 is retracted to set the mounting base 21 in a transportable state in advance. After the transfer of the mounting base 21 is started, first and second squeegees 50a and 50b, which have partition plates 49a and 49b across the transfer width direction of the liquid tank 20 and are arranged above the liquid tank 20, are moved.
Among them, the first squeegee 50a is lowered, and as the mounting base 21 is transferred, the cream solder liquid level in the liquid tank 20 is leveled with rough precision by the partition plate 49a of the first squeegee 50a. As shown in FIG. 7, when the mount 21 reaches the end of the transfer, the first micro switch 51 placed at the end of the transfer detects the mount 21, and based on this detection signal, the pulley 25, 25 are reversely rotated to rotate the timing belt 24 in the opposite direction. At this time, the first squeegee 50a is raised, and the second squeegee 50b is lowered. Then, as shown in FIG. 8, the mounting base 21 is moved in the opposite direction to that described above, and the cream solder liquid level in the liquid tank 20 is made flat with fine precision using the partition plate 49b of the second squeegee 50b. . When the mounting base 21 reaches the transfer starting end, the mounting base 21 is detected by the second micro switch 52 arranged at the transfer starting end, and based on this detection signal, the pulley 25,
Stop the rotation of 25. After completing the leveling of the liquid level in the liquid tank 20 as described above, cream solder is applied to the lead wires 5, 5, . . . again in the same manner as described above.

Although the above embodiment describes the application of cream solder to lead wires in the manufacture of multilayer ceramic capacitors, the present invention is not limited thereto, and can be used in the manufacture of other electronic components having lead wires. Applicable to the device.

Effects of the invention According to the invention, automatic mechanization of the coating work can be easily realized without requiring operator skill, shortening the working time, uniformly applying the conductive material, and improving mass productivity and workability. It is possible to provide a product with significant improvements and high reliability.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of the coating device according to the present invention, Fig. 2 is a side sectional view of Fig. 1, and Fig. 3 is an enlarged view of the main part showing the four corner parts of the support body in Fig. 1. A plan view, FIG. 4 is a sectional view taken along line A-A in FIG. 1 to explain the mounting state of the roller, and FIGS. 5 a, b,
c and d are partially enlarged sectional views showing each operating state in the work of applying cream solder to the lead wire, and Figs. 6 to 8 are schematic side views showing each operating state in the leveling work of the liquid tank. . Fig. 9 is a cross-sectional view showing an example of a multilayer ceramic capacitor, Fig. 10 is a front view showing the first and second chain leads, and Fig. 11 is an example of a jig for storing the first or second chain leads. 12 is a plan view showing the 11th
13 is a sectional view taken along line BB in FIG. 11, and FIG. 14 is an explanatory diagram for explaining a conventional coating operation using a jig. 5... Lead wire, 7, 8... Band-shaped holder,
12...Jig, 15...Paste conductive material [cream solder], 17...Support, 20...Liquid tank,
21...Mounting base, 33...Eccentric cam.

Claims (1)

[Scope of utility model registration request] A vertically movable frame-shaped support is removably attached with a frame-shaped jig in which a plurality of strip-shaped holders, each of which has a large number of lead wires suspended in an aligned state, are housed in parallel, and the lower part of the support is attached. A liquid tank containing a paste-like conductive material to be applied to the lower end of the lead wire and a mounting base on which the liquid tank is placed are positioned and fixed relative to the support. A coating device characterized by comprising a drive mechanism that causes minute vibrations in the vertical direction.