JP2007307493A - Method for manufacturing coating roll, coating device having the same, and printed circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating roll used for a coating device neither single-sidedly moving coating compositions to one side of a pair of doctor bars inside the coating device nor holding the coating compositions inside the same doctor bar, the coating device having the same coating rolls, and a printed circuit board where there is no insufficient embedding of the coating compositions on a coated surface and no rubbing and the quality of coating compositions coated may be evenly made on the front and the back thereof. <P>SOLUTION: The coating roll used for the coating device to simultaneously coat the front and back of the printed circuit board and/or fill the coating compositions on them, wherein the peripheral surface of the roll is provided with trench areas having a plurality of annular trenches and flat areas having flat surfaces with no trenches. The coating device where two coating rolls are positioned at both ends and the trench areas and the flat areas are opposed to each other. The method for manufacturing the printed circuit board where the coating compositions simultaneously coat the front surface and backside and/or fill them while they are circulate-moved inside a pair of the coating rolls and the doctor bar disposed as opposed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coating roll used in a coating apparatus that simultaneously applies and / or fills a front and back of a printed wiring board, a coating apparatus including the coating roll, and a printed wiring board using the coating apparatus. Regarding the method.

  Along with recent downsizing and high performance of equipment, printed circuit boards to be mounted are required to be further thinned in addition to downsizing and high density wiring.

  As an apparatus for manufacturing such a printed wiring board, in particular, an application apparatus for applying a coating material to the printed wiring board simultaneously on the front and back sides, those shown in FIGS. 9 and 10 are already known.

  That is, first, as shown in FIG. 9, the printed wiring board P9 to be coated is transported in the direction of the arrow D9 between the coating rolls R9a and R9b, and the paints T9a and T9b supplied from the doctor bars 96a and 96b. Is commonly applied to the front and back of the printed wiring board P9 using application rolls R9a and R9b (see, for example, Patent Document 1).

  Further, as shown in FIG. 10, the printed wiring board P10 is put in the vertical direction as indicated by an arrow D10, and the printed wiring is made by the coating materials T10a and T10b supplied to the coating rolls R10a and R10b arranged in the horizontal direction. A method of simultaneously applying the front and back of the plate P10 is also employed (see, for example, Patent Document 2).

  The coating roll used in the conventional coating apparatus as shown in FIGS. 9 and 10 has a coating surface 111 having a plurality of ring-shaped grooves on the outer layer of the rotating shaft 115 as shown in FIG. There is a groove roll R11 provided and a solid roll R12 provided with an application surface 122 having no groove on the outer layer of the rotating shaft 125 as shown in FIG.

  The plurality of ring-shaped grooves on the application surface 111 of the groove roll R11 are provided with an appropriate width, depth, and interval to guide the paint in the outer peripheral direction of the roll, and ensure a uniform film thickness. Some have been devised for this purpose (for example, see Patent Document 3).

  A general coating apparatus forms a pair by combining two types of groove rolls and solid rolls. As a combination method, a coating apparatus M13 combining two groove rolls R13a and R13b as shown in FIG. 13 and FIG. There is a coating apparatus M14 that combines a groove roll R14a and a solid roll R14b as shown in FIG.

  The coating device M14 is mainly used when a coating material is embedded in a through-through hole of a printed wiring board that is an object to be coated. The coating material T14b shown in FIG. 14 is gradually applied from the groove roll R14b side to the solid roll R14a side. As the paint T14a moves, the paint T14a stays in the doctor bar 146a on the solid roll R14a side. Therefore, the paint T14b in the doctor bar 146a is reduced, and there is a problem that the coating surface is insufficiently embedded or rubbed. Therefore, normally, when the paint T14a stays in the doctor bar 146a on the solid roll R14a side to some extent, there is a problem that the operator has to manually move the paint T14a to the doctor bar 146b on the groove roll R14b side.

The coating device M13 is mainly used when coating is applied to both surfaces of a printed wiring board, which is an object to be coated, but both of the coatings T13a and T13b shown in FIG. 13 stagnate in the doctor bars 136a and 136b. As a result, the quality of the paint is not uniform in the doctor bar 136a and the doctor bar 136b. In recent years, there has been a strong demand for thinner coatings to be applied to boards, as demand for thinner boards, reduced weight, and improved component mountability has increased. In that case, in order to maintain uniform paint quality. This stirring is important, and there is a problem that the above-mentioned paint stagnates in the doctor bar.
JP 05-265219 A JP 09-290191 A JP 2001-121053 A

  The present invention has been made to solve the above-mentioned two problems, and the problem is that the paint does not move unilaterally to one side of a pair of doctor bars in the coating apparatus, and the same Application roll, application device, and printed wiring board manufacturing method capable of uniforming the quality of the applied paint on the front and back sides without being insufficiently embedded or rubbed on the application surface. Is to provide.

  The present invention according to claim 1 is a coating roll used in a coating apparatus that simultaneously applies and / or fills the front and back of a printed wiring board, and the outer peripheral surface of the roll has a plurality of ring-shaped grooves. The above-mentioned problems are solved by a coating roll characterized by comprising a region and a solid region having a smooth surface without a groove.

  By using this coating roll, a coating device that circulates the paint in the pair of doctor bars in the coating device can be configured.

  Moreover, the present invention according to claim 2 is characterized in that the solid region is formed at one end of the groove region.

  By using this coating roll, the coating material stagnates in a pair of doctor bars in the coating device, even when the coating device is used mainly for coating the coating material on both sides of the printed wiring board. A coating apparatus that does not have this can be configured.

  Moreover, the present invention according to claim 3 is characterized in that the solid region is formed at both ends of the groove region.

  The present invention according to claim 4 is characterized in that the groove region is formed at both ends of the solid region.

  By using a combination of the coating roll of the present invention according to claim 3 and the coating roll of the present invention according to claim 4, the paint is mainly embedded in the through-through hole of the printed wiring board as the coating object. Even in the case of the coating device used in the case, the paint does not move unilaterally to one side of the pair of doctor bars in the coating device, the paint on the other side of the doctor bar does not decrease, It is possible to configure a coating apparatus that does not cause the problem of rubbing.

  Further, the present invention according to claim 5 is provided with the two coating rolls according to claim 1 in a state in which the groove region and the solid region face each other at both ends of the coating roll. The above-described problems are solved by a characteristic coating apparatus.

  Thereby, the coating material in the coating device can be circulated, and it is not necessary to move the coating material manually by the operator, and unidirectional movement or stagnation of the coating material can be avoided.

  Further, the present invention according to claim 6 solves the above-mentioned problem by a coating apparatus comprising two coating rolls according to claim 2 in a state of facing each other alternately.

  Thereby, even if it is a coating device mainly used when apply | coating a coating material on both surfaces of the printed wiring board which is a to-be-coated object, a coating material does not stagnate in a pair of doctor bar in a coating device.

  The present invention according to claim 7 solves the above-mentioned problem by a coating apparatus comprising the coating roll according to claim 3 and the coating roll according to claim 4 in a state of facing each other. It is a thing.

  As a result, even if the coating apparatus is used mainly for embedding paint in the through-hole of the printed wiring board that is the object to be coated, the paint is unilaterally moved to one side of the pair of doctor bars in the coating apparatus. There is no end.

  The present invention according to claim 8 uses the coating apparatus according to claim 6 to apply and / or simultaneously coat and / or coat the coating material between the pair of coating rolls installed opposite to each other or through the doctor bar. The above-described problems are solved by a method for producing a printed wiring board, which is characterized by being filled.

  This prevents the paint from stagnating in the doctor bar, and the uniformly stirred paint is applied to the front and back of the printed wiring board, so that the quality of the applied paint can be obtained on the front and back. Can do.

  The present invention according to claim 9 uses the coating apparatus according to claim 7 to apply and / or simultaneously coat and / or coat the coating material between the pair of coating rolls installed opposite to each other and through the doctor bar. The above-described problems are solved by a method for producing a printed wiring board, which is characterized by being filled.

  As a result, a printed wiring board can be obtained in which there is no insufficient embedding or rubbing on the coated surface.

  By using the coating roll and the coating apparatus of the present invention, it is possible to prevent the paint from unilaterally moving to one side of the pair of doctor bars in the coating apparatus and to prevent the paint from stagnating in the same doctor bar. can do. Further, according to the method for producing a printed wiring board of the present invention, it is possible to produce a printed wiring board in which the coating surface is not insufficiently embedded or rubbed and the quality of the applied paint is uniform on the front and back sides.

  Hereinafter, embodiments of a coating roll and a coating apparatus according to the present invention will be described with reference to FIGS. 1 and 4.

  In FIG. 1, R <b> 1 is a coating roll according to the present invention, which includes a rotating shaft 5, a groove region 1 having a plurality of ring-shaped grooves on the outer peripheral surface of the roll, and a solid region having a smooth surface without grooves. 4 is provided.

  In FIG. 4, M4 is a coating apparatus of the present invention, and is configured by arranging two coating rolls R1 of the present invention shown in FIG.

  In the coating apparatus M4 of the present invention, in the two coating rolls R14a and R14b, the paints T4a and T4b in the groove region 1a that is not in contact with the printed wiring board P4 and in contact with the other solid region are solid regions. In other words, the paints T4a and T4b move as indicated by arrows D41 and D43 in the figure. In addition, under the influence of the movement in the directions of the arrows D41 and D43, the paints T4a and T4b in the doctor bars 46a and 46b also move as indicated by arrows D42 and D44 in the drawing. As a result, the coating material in the coating apparatus M4 circulates as indicated by an arrow D41, an arrow D42, an arrow D43, an arrow D44, and an arrow D41 again.

  This prevents the paint from stagnating in the doctor bar, and the uniformly stirred paint is applied to the front and back of the printed wiring board, so that the quality of the applied paint can be obtained on the front and back. Can do.

  Further, another embodiment of the coating roll and the coating apparatus of the present invention will be described with reference to FIG. 2, FIG. 3 and FIG.

  In FIG. 2, R2 is a coating roll according to the present invention, which has a rotating shaft 25, a groove region 21 having a plurality of ring-shaped grooves on the outer peripheral surface of the roll, and end portions on both sides of the groove region 21. Are provided with solid regions 24a and 24b having smooth surfaces without grooves.

  In FIG. 3, R3 is a coating roll according to the present invention, which includes a rotation shaft 35, a solid area 32 having a smooth surface without a groove on the outer peripheral surface of the roll, and both sides of the groove area 32. Groove regions 33a and 33b having a plurality of ring-shaped grooves at the end.

  In FIG. 5, M5 is a coating apparatus of the present invention, in which the coating roll R2 of the present invention shown in FIG. 2 and the coating roll R3 of the present invention shown in FIG. Configured.

  In the coating apparatus M5 of the present invention, in the two coating rolls R25 and R35, the coating regions T5a and T5b in the groove region that is not in contact with the printed wiring board P5 and is in contact with the other solid region are the solid region side. In other words, the paints T5a and T5b move as indicated by arrows D51 and D55 in the figure. Further, the paints T5a and T5b in the doctor bars 56a and 56b are also affected by the movement in the directions of the arrows D51 and D55 and the movements in the directions of the arrows D53 and D57, and the arrows D52 and D54 in the drawing are also shown. , And as indicated by arrows D56 and D58. As a result, the coating material in the coating apparatus M5 circulates as an arrow D51, an arrow D52, an arrow D53, an arrow D54, and an arrow D51 again, and an arrow D55, an arrow D56, an arrow D57, an arrow D58, and an arrow D55 again.

  As a result, even if the coating device is used mainly when the coating material is embedded in the through-through hole of the printed wiring board as the coating object, the coating material does not move unilaterally to one side of the pair of doctor bars in the coating device. Because the paint on the doctor side on the other side is not reduced, and there is no problem of insufficient embedding or rubbing on the coated surface, a printed wiring board is obtained that does not have insufficient embedding or rubbing on the coated surface. be able to.

  Next, an embodiment of a method for manufacturing a printed wiring board according to the present invention will be described with reference to FIGS.

  First, as shown in FIG. 6A, a substrate P6 having a conductor layer 62 on the upper and lower layers of the insulating layer 61 is prepared. At this time, the substrate P6 may be a single-sided substrate, a double-sided substrate, or a multilayer substrate.

  Next, as shown in FIG. 6 (b), through through holes for front and back connection are formed by an NC drill device or a laser and subjected to chemical treatment such as hole cleaning, as shown in FIG. 6 (c). Conducted in the order of electroless copper plating and electrolytic copper plating.

  Next, a photosensitive etching resist is applied so as to cover the front and back surfaces and through through holes (not shown), and after exposing necessary portions, development and etching are performed, and a circuit as shown in FIG. A printed wiring board after formation is obtained. Instead of applying the photosensitive etching resist, an etching resist film may be stretched so as to cover the front and back surfaces and the through through holes.

  Next, as shown in FIG. 7E, a solder resist 74 is applied. At this time, it is desirable to apply using the application apparatus shown in FIG.

  Next, as shown in FIG. 7F, the surface of the printed wiring board coated with the solder resist 74 is squeezed using a squeegee (not shown).

  Next, as shown in FIG. 8G, a solder resist 85 is applied and squeezed using a squeegee (not shown), and then a solder resist 86 is applied as shown in FIG. Squeeze with a squeegee. At this time, it is desirable to apply using the application apparatus shown in FIG.

  By repeatedly applying these solder resists and squeezing, unevenness on the surface of the solder resist can be reduced.

  The solder resists 74, 85, and 86 may be the same.

  Further, the number of repetitions of the solder resist is not specified and / or limited by this example.

  Next, as shown in FIG. 8 (k), the solder resist is exposed, developed and cured to obtain a printed wiring board P8 coated with the solder resist.

  Thereby, there is obtained a printed wiring board on which the solder resist having a uniform quality is applied on both the front and back sides without being embedded and rubbing on the coated surface.

  In describing the present invention, FIGS. 1 to 8 have been described as examples. However, the configuration of the present invention is not limited to these examples, and is not limited to these examples. Various modifications can be made within.

FIG. 3 is a schematic plan view showing a first coating roll of the present invention. The schematic plane explanatory drawing which shows the 2nd roll for application | coating of this invention. FIG. 5 is a schematic plan view showing a third coating roll of the present invention. FIG. 3 is a schematic plan view showing a first coating apparatus of the present invention. The schematic plane explanatory view showing the 2nd coating device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic cross-sectional process explanatory drawing which shows the manufacturing method of the printed wiring board of this invention. FIG. 7 is a schematic cross-sectional process explanatory diagram following FIG. 6. FIG. 8 is a schematic cross-sectional process explanatory diagram following FIG. 7. Schematic cross-sectional explanatory drawing which shows the example of a common coating device. Schematic cross-sectional explanatory drawing which shows the other general coating apparatus example. The schematic plane explanatory drawing which shows the example of the conventional roll for an application | coating. Schematic plane explanatory drawing which shows the other example of the conventional application | coating roll. The schematic plane explanatory drawing which shows the example of the conventional coating device. The schematic plane explanatory drawing which shows the other example of the conventional coating device.

Explanation of symbols

1, 1a, 21, 33a, 33b, 111: groove regions 4, 24a, 24b, 32, 122: solid regions 5, 25, 35, 115, 125: rotation axes R1, R2, R3, R14a, R14b, R25, R35, R9a, R9b, R10a, R10b, R11, R12: coating rolls 46a, 46b, 56a, 56b, 96a, 96b, 106a, 106b, 136a, 136b, 146a, 146b: doctor bars T4a, T4b, T5a, T5b, T9a, T9b, T10a, T10b, T13a, T13b, T14a, T14b: Paint P4, P5, P8, P9, P10, P13, P14: Printed wiring board 97: Conveying machine 98: Conveying rollers M4, M5, M13, M14: Coating device 62: Conductor layer 61: Insulating layer P6: Substrates 74, 85, 86: Solder regis R13a, R13b, R14b: Groove roll R14a: Solid roll D41, D42, D43, D44, D51, D52, D53, D54, D55, D56, D57, D58, D131, D132, D141, D142, D143, D144: Paint circulation direction D9, D10: Printed wiring board conveyance direction

Claims (9)

  An application roll used in an application device that simultaneously applies and / or fills the front and back surfaces of a printed wiring board, and the outer peripheral surface of the roll has a groove area having a plurality of ring-shaped grooves and a smooth surface without grooves. A coating roll, comprising: a solid region having the same.   2. The coating roll according to claim 1, wherein the solid area is formed at one end of the groove area.   The coating roll according to claim 1, wherein the solid region is formed at both ends of the groove region.   2. The coating roll according to claim 1, wherein the groove region is formed at both ends of the solid region.   2. A coating apparatus comprising two coating rolls according to claim 1, wherein the groove region and the solid region face each other at both ends of the coating roll.   The coating apparatus according to claim 5, wherein the two coating rolls according to claim 2 are provided in a state of facing each other alternately.   The coating apparatus according to claim 5, wherein the coating roll according to claim 3 and the coating roll according to claim 4 are provided facing each other.   Using the coating apparatus according to claim 6, a coating material is applied and / or filled at the same time, while circulating and moving between a pair of coating rolls disposed opposite to each other or inside a doctor bar. Production method.   A printed wiring board characterized in that, using the coating apparatus according to claim 7, the coating material is applied and / or filled at the same time while circulating and moving between a pair of coating rolls disposed opposite to each other or inside the doctor bar. Production method.

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