JPH0239444A - Resin coating system for electronic component - Google Patents

Abstract

PURPOSE:To increase the treatment speed of resin coating by a method wherein a work put on one tray is dried while a work put on the other tray is coated with resin. CONSTITUTION:A first tray 20a is put on the guide 53 of a loader part 10 and transferred to the guide 30 of a turning-over part 11. After that, a second tray 20b is put on the guide 53. The guide 30 is turned over and made to descend to coat a work 1 with resin. After the coating is finished, the guide 30 is turned over and made to ascend to the original position. The tray 20a is transferred to a guide 54 and drying is started. At the same time, the tray 20b is transferred to the guide 30 and the guide 30 is turned over and made to descend to coat a work 2 with resin. Further, elevating guide part 13 is made to descend and a guide rail is placed on the same line with the guide 53 and the guide 54 and the tray 20a is transferred from a waiting part 12 to the guide 53. The elevating guide 13 is made to ascend. When the coating is finished, the guide 30 is turned over and made to ascend to the original position. At that time, the drying of the work 1 is finished and the second coating is started.

Description

[Detailed Description of the Invention] 1. Field of Industrial Application] The present invention is a method for melting electronic components having printed circuit boards using ceramic plates, such as hybrid ICs and resistor arrays equipped with various circuit components constituting electronic circuits. The present invention relates to a method for coating with a state resin.

[Prior Art] Electronic components such as hybrid ICs are manufactured by forming a predetermined wiring pattern on a substrate made of a ceramic plate, etc., and also having a substrate on which circuit components such as resistors, capacitors, integrated circuits, etc. are mounted, and the substrate. It has multiple lead parts extending from the board part, and is coated with an electrically insulating resin or a resin with excellent electrical insulation properties in order to insulate and protect the wiring pattern on the board part and the circuit components mounted thereon. It looks like this. This resin coating is performed by dipping the workpiece in a resin liquid bath, but in order to ensure that the entire workpiece has an even and constant thickness, dipping and drying are performed during this resin coating. I try to repeat it multiple times. In order to repeat this coating and drying process using an automatic machine, the workpiece is immersed in a resin liquid bath, and after the coating is applied, the workpiece is pulled out of the resin liquid bath and the workpiece is kept at a certain level. After the workpiece is sufficiently dried, it is immersed in the resin bath again, and this process is repeated as many times as necessary.

[Problem to be Solved by the Invention 1] By the way, in order to coat the substrate uniformly and with high precision, the workpiece should be pulled up slowly, for example at about 0.4 to 0.5 mm/s after being immersed. By doing this at a high speed, it is necessary to make the resin layer uniform. Moreover, the workpiece pulled up in this way must be dried for, for example, 30 seconds or more, so during this drying, However, the device must be kept in a stopped state, which has the drawback of extremely low processing efficiency.

The present invention has been made in view of the above points, and an object thereof is to perform resin coating and drying at the same time, so that resin coating can be performed quickly and efficiently. An object of the present invention is to provide a resin coating device for electronic components.

Means for Solving Problem E 1 In order to achieve the above-mentioned object, the present invention provides a tray that supports a workpiece with the lead part of the workpiece implanted therein, and a tray that supports the workpiece by inverting and raising and lowering the tray. an inversion table for immersing a workpiece in a resin liquid tank; a loader section and a standby section fixedly provided on both sides of the inversion table; After the workpiece supported by one tray is immersed in the resin liquid tank, the one tray is moved to the standby part, and the other tray is moved to the standby part. By carrying the work onto the reversing table and reversing the reversing table, while the work on the other tray is immersed in the resin liquid tank, displacing the lifting guide part to the lowering position, The present invention is characterized in that the first tray is moved to the loader section, and during this time the workpiece supported by the first tray is dried.

[Operation] First, the workpiece is carried into the loader section, which is a first tray supported, and transferred from the loader section to the reversing table. Then, the first tray is inverted by the inverting table and lowered to be dipped into a resin liquid bath, thereby performing resin coating. During this time, the second tray is installed in the loader section. and,
The workpiece is pulled up and returned to its original position, and the second tray is moved to the standby section, and the second tray installed in the loader section is moved to the reversal section.

In this state, the second tray is dip-jigged into the resin liquid tank by inverting and lowering the reversing section, or at this time, the elevating guide section is displaced to the lowering position. Then, while the work on the second tray is immersed in the resin liquid tank, the first tray is moved from the standby section to the loader section via the lifting guide section. Thereafter, the second tray is removed from the resin liquid bath, and during this time the workpiece supported on the first tray is dried. Then, the second tray is moved to the standby section, the first tray is moved to the reversing section, and the first tray is again inverted and lowered to be immersed in the resin liquid bath.

By repeating the above-described operations, the workpieces in the first tray and the second tray are sequentially and alternately coated with resin cope ink and dried. After the required number of coach inks have been applied to the workpiece supported by the first tray, the first tray is transferred to the loader section, the first tray is recovered, and the third tray and other Installed in the loader section. Then, when the second tray is pulled up from the resin liquid tank and moved to the standby section, the third tray is moved to the inversion table and immersed in the resin liquid tank. At this time, the second tray in the standby section is moved to the loader section, taken out, and replaced with the fourth tray. In this way, the third tray, the fourth tray...
・It becomes possible to sequentially apply resin coating to.

Therefore, while the workpiece supported on one tray is immersed in the resin liquid tank, the workpiece supported on the other tray is dried, making the work efficiency of the resin coach ink extremely efficient. You will be able to know what to do.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, FIG. 1 shows the overall configuration of a coating apparatus for implementing the method of the present invention. As shown in FIG. 2, the workpiece 1 coated with resin by this coach ink device includes a substrate portion 1a made of a plate of ceramic or the like, and a plurality of lead portions 1b, Ib, protruding from the substrate portion 1a.
. . . and a tie bar 1c in the form of a thin strip attached to the tip of the lead portion 1b. A predetermined wiring pattern is formed on the substrate portion 1a, and various circuit components 2, 2, .・ ・The surface has large irregularities. In this manner, the substrate portion 1a on which various circuit components 2 are mounted is coated with a covering layer 3 having good electrical insulation and heat resistance, such as phenol resin.

In FIG. 1, 10 is a loader section, 11 is a reversing section, 12 is a standby section, 13 is a lifting guide section, and 14 is a resin liquid tank. A large number of works 1 are supported on a tray 20 and carried into the loader section 10, transferred to the reversing section 11, and immersed in a resin liquid tank 14, where a resin coating is applied to the substrate section 1a. After that, it is dried during the time from the standby section 12 through the lifting guide 13 and before returning to the loader section IO.

As shown in FIG. 3, the tray 20 that supports the workpiece 1 has a plurality of protrusions 21a, 21a, . A spring plate piece 22 consisting of a large number of small pieces is placed between adjacent protrusions 21a, 21a, and its bottom 22a is fixed with a screw 2.
3 to the base portion 21, and the spring plate piece 2
holding wall portions 22b, 22b vertically rising along the side wall surface of the protrusion 21a on both left and right sides of the ridge 21a; 22c, and further includes the drawing part 22
A locking spring piece 22d is provided at the upper part of c. The tie bar 1c in the workpiece 1 is inserted from the lead-in portion 22c and planted so as to be sandwiched between the holding wall portion 22b and the protrusion 21a, and the tie bar 1c is fixed to the base portion 21 by the locking spring piece 22d. It is designed to be mounted so as to come into contact with the bottom wall.

Next, the reversing section 11 has a reversing section guide 30, and as shown in FIGS. 4 and 5, the reversing section 11 includes a bottom wall section 30a and side wall sections erected on both left and right sides of the bottom wall section 30a. 30b, and a locking wall portion 30c is formed at the upper end. The reversing guide 30 is capable of reversing the tray 20, and at the time of reversing, the tray 20 is regulated by the locking wall portion 30c and held so as not to fall off from the reversing portion guide 30. ing. Further, the reversing section guide 30 has a position where it is in the same single line as the loader section 10 and the standby section 12, and a position where the workpiece 1 planted on the tray 20 attached to the reversing section guide 30 is immersed in the resin liquid tank 14. It is constructed so that it can be raised and lowered between the two positions.

Attachment members: 11a, :llb are vertically provided on the lower surface of the reversing base 31 that supports the reversing section guide 30, and a rotating shaft 32 is mounted between the mounting members: 11a, :llb. Further, the rotation shaft 32 is rotatably inserted into a support block 33a connected to the support base 33,
A reversing motor 34 is mounted on this support base 33. A pulley 35a is attached to the reversing motor 34, and a pulley 35b is also attached to the rotating shaft 32, and a timing belt 36 is wound and provided between the pulleys 35a and 35b. By driving the rotating shaft 32, the rotating shaft 32 is rotated 180', and the reversing section guide 30 can be displaced between the origin position shown by the solid line in FIG. 5 and the reversing position shown by the two-dot chain line. It has become.

Further, in order to raise and lower the reversing section guide 30, a feed screw 37a rotated by a lifting drive motor 37 is connected to the support base 33.
By operating the support base 33, the guide 3
It is designed so that it can be raised and lowered along line 8. A reflective liquid level sensor 39 for detecting the height position of the liquid level in the resin liquid tank 14 is attached to the support flock 32a. It is configured to be able to detect the interval between.

Next, as shown in FIG. 6, the elevating guide section 13 has a guide rail 40, which guides the tray 20 placed in the standby section 12 into the loader when the reversing section guide 30 is lowered. The guide rail 40 is used to form a tray transfer path for transferring to the reversing section 10, and the guide rail 40 is disposed above the reversing section guide 30 in the reversing section 11. And this guide rail 40 is
It is attached to a mounting frame 41, and the mounting frame 41 is fixed to a lifting base 42. This elevating base 42 is driven up and down along the guide post 45 by a feed screw 44 connected to an elevating drive motor 43, and when the reversing section guide 30 is at the origin position, the tray 20 attached to the reversing section guide 30 an elevated position that does not interfere with the work l planted in the workpiece l, and a lowered position that is flush with the loader section 10 and the standby section 12 and allows the tray 20 to be moved from the standby section 12 toward the loader section 1o. It is designed so that it can be moved up and down during the period.

On the other hand, the loader section lO and the standby section 12 include a loader section guide 53 fixed by a flaket 51, 52,
It has a standby section guide 54.

Furthermore, in order to move the tray 20 between the loader section 10 and the reversing section 11 or the elevating guide section 13, and to move the tray 20 between the reversing section 11 or the elevating guide section 13 and the standby section 12, A guide rod 60 is provided in the transport direction of the tray 2o, and the guide rod 6
0 is equipped with horizontal moving rollers 61a and 61b, and is moved horizontally by a horizontal moving cylinder 62. Each horizontally movable flock 61a, 61b is provided with a conveying claw 63a.

63b is mounted so as to be rotatable in the vertical direction (the transport claw 63b on the water-driven flock 61b side is not shown in the drawing), and the tray 20 can be horizontally transported by these transport claws 63a and 63b. It has become.

The resin liquid tank 14 is disposed in the r direction of the reversing section 11, as shown in FIG.

It consists of a double tank consisting of an inner tank 71 and an outer tank 72, and the inner tank 71 and the outer tank 72 are communicated with each other by a communication path 73,
The wall height of the inner tank 71 is lower than that of the outer tank 72. For this purpose, the resin liquid in the resin liquid tank 14 flows from the outer tank 7Z through the communication path 73 into the inner tank 72, forming a circulation flow that overflows from the upper part of the inner tank 72 to the outer tank 71. In order to forcibly form this circulation flow, a stirring blade 74 is installed in the communication path 73, and the stirring blade 74 is driven to rotate by a stirring motor 75. There is.

Reference numeral 80 denotes a swing motor, and a swing drive unit 81 that rotates eccentrically is attached to the swing motor 80, and the reversing part guide 30 is lowered to immerse the workpiece 1 in the resin liquid tank 14. At this time, the reversing portion guide 30 is engaged with and reciprocating the reversing portion guide 30 in the horizontal direction, thereby making it possible for the resin to flow around the workpiece 1 in a good manner. In addition, 82 is used in the inner tank 71 when precipitation of the resin liquid is severe.
This is a scraper for stirring the area between the outer tank 72 and the outer tank 72.

This embodiment is constructed as described above, and its operation will be explained next.

First, the motor 75 is rotated to rotate the stirring blade 74 to form a circulation flow in the resin liquid in the resin liquid layer 14 that flows from the inner tank 71 to the outer tank 72 and from the communication path 73 to the inner tank 71. As a result, the fluidity of the resin liquid in the resin liquid 4111!14 is maintained. On the other hand, the workpiece 1 has its substrate portion 1a facing upward, and the sorting portion H> is erected on the tray 20. The tray 20 loaded with the workpiece 1 in this manner is placed a on the loader section guide 53 of the loader section 10 by an appropriate carrying means.

In this state, the stirring of the resin liquid tank 14 is stopped and the tray 2
0 is transferred from the loader section guide 53 to the reversing section guide 30 in the reversing section 11 by the transport claw 63a. After that, the conveying claw 63a is disengaged from the tray 20, and the reversing part guide 30 is reversed by 180 degrees about the rotation shaft 32 by the reversing motor 34, and the workpiece 1 is displaced vertically. By operating the lift drive motor 37 and lowering the reversing part guide 30, the workpiece 1 is immersed in the resin liquid tank 14 from the base part 1a of the workpiece 1 to a certain length from the base of the lead part tb. Here, since a liquid level sensor 39 is attached to the support base 33 in the reversing section 11, the lowering stop position of the reversing section guide 37 is controlled based on the signal from the liquid level sensor 39. It becomes possible to strictly control the cutting accuracy of the resin for the workpiece 1.

In this way, it is possible to prevent the resin liquid from rebounding when the workpiece 1 is immersed in the resin liquid tank 14, and also to keep the amount of resin liquid attached when the workpiece 1 is removed from the resin liquid tank 14 to be constant. In order to make the thickness of the resin layer uniform, it is necessary to control the lifting and lowering speed of the workpiece 1 from the time when the tip of the workpiece 1 contacts the liquid surface in the resin liquid tank 14 until it leaves the liquid surface. must be carried out extremely strictly and at low speed. In particular, the pulling and pulling speed of the workpiece 1 is usually extremely slow, 0.4 to 0.5 mm/s.

After the substrate 1a is coated with the resin by the dipping means as described above, the reversing part kite 30 is rotated 180 degrees again, and the work 1 is placed in an upright state. Thereafter, the reversing section guide 30 is raised to a position where it is in the same straight line as the loader section 10 and the standby section 12. Then, with the workpiece 1 removed from the resin liquid tank 14 in this manner, the workpiece 1 is dried, and the drying time is required to be at least about 30 seconds.

As mentioned above, the dipping time from when the workpiece 1 is brought into contact with the surface of the resin liquid 4614 to when it is removed from the surface requires a considerably long time, and it is difficult to dry the workpiece coated with resin in this way. also requires quite a long time. Therefore, in the present invention,
This dipping time is used to dry the work l at the same time.

Therefore, the procedure for performing dipping and drying at the same time will be explained below with reference to FIG.

That is, first, as shown in FIG. 8(a), the loader section 10
The first tray 20a is attached to the loader section guide 5:l, and the tray 20a is moved from the loader section guide 53 to the reversing section 1.
1 to the reversing section guide 30. At the same time or after this, the second tray 20b is attached to the loader section guide 53, as shown in FIG. 5(b). In this state,
As shown in the same figure (C), the reversing section guide 30 is
The tray 20a is lowered and the work 1 placed on the tray 20a is coated with resin. When this resin coating is completed, as shown in FIG.
The loader section guide 53 and the standby section guide 5 of the standby section 12
4. Raise it to a position where it is in the same straight line as 4.

Then, as shown in FIG. 8(e), the first tray 20a is moved to the standby section guide 54 to start drying, and the second tray 20b is moved to the reversing section guide 30.
to be transferred to Then, as shown in FIG.
Resin coating is applied to the work 1 at 0b. At this time, the elevating guide section 13 is lowered and the guide rail 40 is placed in a position that is in the same straight line as the loader section guide 53 and the standby section guide 54, and in this state, the first tray 20a is moved to the standby section 12. Then, it is transferred to the loader section guide 53 via the guide rail 40. Then, as shown in FIG. 5G, the lifting guide section 13 is raised, and the reversing section guide 30 is moved to the loader section kite 53. It is raised to the same position as the standby section guide 54.

In this state, drying of the workpiece 1 supported on the first tray 20a has been completed.

Therefore, the first. As shown in J(h), the second tray 20b is moved to the standby section guide 54, and the first tray 20a is moved to the reversing section guide 30 again. After that, while the workpiece 1 supported on the first tray 20a is being coated with resin for the second time in the same manner as described above, as is clear from FIG. 20b from the standby section guide 54 via the guide rail 40 to the loader section guide 53, and as shown in FIG. The second resin coating is applied to the workpiece 1, and drying of the workpiece 1 on the second tray 20b is completed at the same time.

When the second resin coating on the first tray 20a is completed, as shown in FIG. 8(k), the first
The tray 20a is transferred to the standby section guide 54 to start drying, and the workpiece 1 on the second tray 20b, which has already been coated with resin once, is transferred again to the resin liquid tank 1.
During this period, the first tray 20a is moved to the loader section guide 53 as shown in FIG. 4 (1).

In this state, or if overlapping coating is required three times or more, repeat the above-mentioned rotation the necessary number of times to complete the resin coating on the work l on the first tray 20a. When the tray 20a moves to the loader section guide 53, the first tray 20a is taken out and the third tray 20c is moved to the loader section guide 53 of the loader section 10, as shown in FIG.
to be established. After that, the second
The tray 20b is moved to the standby part guide 54, and the third tray 20c is moved to the reversing part guide 30, and the workpiece 1 mounted on the third tray 20c is moved as shown in FIG. While applying the first resin coach ink to the
Move to 3. After this, when the workpiece 1 on the third tray 20c is pulled up, the second tray ZOb is taken out from the loader section IO, as shown in FIG.
The fourth tray 20d is mounted on this loader section lO, and the workpiece mounted on the third tray 20c, the workpiece mounted on the fourth tray 20d, etc.
Resin coating and drying are repeated in this order.

In addition, as shown in No. 9-1, before carrying one helay 20 into the loader section 10, a tank 10 containing a solution that is the same as or similar to the solvent of the resin liquid in the resin liquid tank 14 is prepared.
0, the workpiece I is cleaned, and the compatibility with the resin liquid when the workpiece 1 is immersed in the resin M tank 4 is improved, and the circuit component 2 is mounted. The resin wraps around areas with large irregularities better, preventing the occurrence of pinholes, etc., as well as making it possible to accurately cut off 1W of 81 fat. The quality is extremely good.

[Effects of the Invention] As explained below, the present invention is such that while resin coating is being applied to the workpieces placed on one tray, the workpieces placed on the other trays are dried. As a result, processing speed can be increased.

[Brief explanation of the drawing]

The drawings show an apparatus for carrying out the coating method of the present invention, in which Fig. 1 is an overall configuration diagram of the coating apparatus, and Fig. 2 is an external view of a workpiece with a part of the coating layer cut away. , FIG. 3 is an explanatory diagram of the configuration of the tray that supports the workpiece, FIG. 4 is an explanatory diagram of the configuration of the reversing section, FIG. 5 is an explanatory diagram of the operation of the reversing section, FIG. 6 is an external view of the lifting guide section, and FIG. The figure is an external view of a resin liquid tank, FIGS. 8(a) to 8(p) are explanatory diagrams of the operation of the system of the present invention, and FIG. 9 is a diagram of the apparatus configuration showing another embodiment of the present invention. 1: Workpiece, 1a: Board part, lb: Lead part, 2:
Circuit component, 3: Coating layer, 10: Loader part, 1
1: Reversing section, 12: Standby section, 13: Lifting guide section, 14
: Resin liquid tank, 20: Tray, 30: Reversing part guide, 31
: Inversion base, 32: Rotation axis, 33: Support base, 34:
Reversing motor, 37: Lifting drive motor, 40 Ni guide rail, 42: Lifting base, 43: Lifting drive motor, 53:
Loader section guide, 54: Standby section guide, e3a, 8
3b: Conveyance claw. Figure 2 Figure

Claims (2)

[Claims] (1) In a workpiece in which a plurality of lead portions are extended from the substrate portion, the substrate portion of the workpiece is repeatedly immersed and dried in a resin liquid bath multiple times to coat the substrate portion with a resin, A tray that supports the workpiece with the lead part planted therein, an inversion table that inverts and raises and lowers the tray to immerse the workpiece in the resin liquid tank, and fixedly provided on both sides of the inversion table. The workpiece has a loader section, a standby section, and an elevation guide section that can be displaced to a lowered position that is colinear with the loader section and the standby section when the reversing table is lowered, and the workpiece is supported on one tray. After immersing the tray in the resin liquid tank, the one tray is moved to the standby section, the other tray is carried onto the inversion table, and the inversion table is inverted. While the workpiece is immersed in the resin liquid tank, the lifting guide section is moved to the lowered position to move the one tray to the loader section, and during this time, the workpiece is supported by the one tray. A resin coating method for electronic parts that is characterized by drying the workpiece. (2) Claim (1) characterized in that, before carrying the tray into the loader section, the tray is immersed in a solution that is the same as or similar to the solvent of the resin liquid in the resin liquid tank as a pretreatment. resin coating method for electronic components.