JP2009293114A - Electrolytic plating device and electrolytic plating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolytic plating device and an electrolytic plating method capable of simply adjusting and changing an electric current shielding structure with a shielding plate and uniformizing a plating thickness. <P>SOLUTION: In the electrolytic plating device, at least one anode 14 is vertically disposed in a plating tank 12 in which plating liquid 13 is charged, a tape-like product 3 having a conductive part 15 to be subjected to electrolytic plating is conveyed along the anode 14 while keeping a surface of the product vertical so as to face the anode 14 and the insulating shielding plate 20 having an opening is disposed between the anode 14 and the tape-like product 3, wherein the shielding plate 20 is configured by stacking a main shielding plate 18 on a sub shielding plate 19 which adjusts an opening 18a of the main shielding plate 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electroplating apparatus and an electroplating method, and more particularly to an electroplating apparatus and an electroplating method for performing an electroplating process while conveying a tape-shaped product having a conductor portion.

  Various electrolytic plating techniques are used in tape-shaped products, for example, tape carriers for semiconductor devices such as TAB tape. Specifically, the copper plating of the blind via hole conformal or via filling to make the conductive layers on both sides of the double-sided wiring TAB tape material conductive, the filling copper plating into the solder ball mounting via hole, the semi-additive pattern copper plating, Examples thereof include nickel and gold plating on the copper wiring surface after the wiring pattern is formed and the solder ball mounting via hole.

A conventional electrolytic plating apparatus for performing electrolytic plating such as gold or nickel plating on a TAB tape by a reel-to-reel production method will be described with reference to the drawings.
As shown in FIG. 8 (1), a plating bath (plating treatment bath) 12 is filled with a plating solution 13, and an anode 14 is vertically arranged in the plating bath 12. The TAB tape 3 to be electroplated is conveyed through the plating tank 12 in the horizontal direction (direction perpendicular to the paper surface of FIG. 8) along the anode 14 while facing the anode 14 with its surface vertical. .

  A positive side of a rectifier (not shown) is connected to the anode 14 in the plating tank 12, and a negative side of the rectifier is connected to a power supply roll (not shown). When the TAB tape 3 is transported, the feeding roll is configured to rotate while being in contact with the conductor portion 15 of the TAB tape 3. If a voltage is applied while the TAB tape 3 is in the plating tank 12, the current C Flows and nickel ions or the like in the plating solution 13 are deposited on the conductor portion (conductor pattern or the like) 15 of the TAB tape 3 by an electrolytic reaction.

  Electrolytic gold plating generally has a high throwing power and a very good plating thickness distribution. However, since electrolytic nickel plating and electrolytic copper plating have a poor plating thickness distribution, the current from the anode 14 to the conductor portion 15 of the TAB tape 3 is low. A current shielding technique using an insulating shielding plate that shields a part of C is used. 8 (2) to (4) and FIGS. 9 (1) to (3) show a conventional electrolytic plating apparatus using a shielding plate 17. FIG. The shielding plate 17 is formed with an opening 17a having a vertical width that matches the width of the conductor portion 15 of the TAB tape 3 (the vertical dimension of the conductor portion 15 in the figure).

  In addition, as a related technique, a central plate and a peripheral portion are arranged so that a current density in the central portion and the peripheral portion of the substrate is uniform by arranging a shielding plate (perforated plate) between the substrate and the anode disposed opposite to each other. According to the electrolytic plating method using a porous shielding plate with different hole areas (see Patent Document 1) and the width dimension of the printed wiring board suspended and held by the clamping member (clip) Position adjustment mechanism (rack and pinion) that can adjust the distance between two shielding plates (metal bars) arranged close to both sides of the wiring board and between the two clamping members (clips) A printed wiring board plating jig provided (see Patent Document 2) is known.

JP 2002-54000 A JP 2005-42170 A

  By the way, although the plating thickness distribution varies depending on the plating conditions, the current density has a great influence on the plating thickness distribution. In general, the plating thickness distribution is improved by performing plating at a low current density over time. Moreover, if the metal type of plating and the target plating thickness are the same, the current density and the time required for plating are in an inversely proportional relationship. Therefore, if the current density is lowered to improve the plating thickness distribution, the required time becomes longer and the productivity decreases. Particularly in the case of a reel-to-reel production method such as TAB tape, the conveying speed of the plating process must be slowed, which directly affects productivity.

  In order to solve the problem of lowering productivity, the plating method must maintain the current density, and the current shielding technique using the shielding plate 17 described above is often used. Next, problems of current shielding using the shielding plate 17 will be described.

FIGS. 8 and 9 are all cross-sectional views perpendicular to the transport direction of the TAB tape 3, and schematically show the current distribution during electrolytic plating.
In the case of FIG. 8 (1) without a shielding plate, the current (current line) C during electroplating has a current component that wraps around and reaches the end of the conductor portion 15 of the TAB tape 3, In particular, the end portion of the TAB tape 3 has a thicker plating thickness, and the central portion tends to be thinner. For this reason, in order to prevent electric current concentration to the edge part of the TAB tape 3, and to suppress plating thickness, the current shielding technique which has arrange | positioned the shielding board 17 grade | etc., Is used.

In the case of the shielding plate 17 having a narrow width (vertical width) as shown in FIG. 8B, a part of the current C wraps around the shielding plate 17 and reaches the end of the conductor portion 15. Since the plating thickness at the end is increased, it is preferable that the lower side of the shielding plate 17 is in contact with the bottom surface of the plating tank 12 and the upper side is exposed on the surface of the plating solution 13 as shown in FIG.
When the thickness of the shielding plate 17 is small as shown in FIG. 8 (4), the sneak current near the upper and lower ends of the opening 17a of the shielding plate 17 out of the current C from the anode 14 to the conductor portion 15 serving as the cathode. It is difficult to shield the components, and the plating thickness near the end of the TAB tape 3 is increased. In this case, as shown in FIG. 8C, the plating thickness distribution is considerably improved by increasing the thickness of the shielding plate 17 to some extent.

However, as shown in FIG. 9 (1), as the conductor portion 15 of the TAB tape 3 becomes wider and larger in area, the plating thickness distribution becomes worse, and the difficulty of the current shielding technique by the shielding plate 17 for uniform plating thickness. Becomes higher.
In the case of the TAB tape 3 having multiple rows, for example, two rows (FIG. 9 (2)) and 3 rows (FIG. 9 (3)), the shielding plate 17 having no shielding member is used. Inside the openings 17a, current concentrates on the end portions of the conductor portions 15 between the respective rows, and the plating thickness in the vicinity thereof is increased.

  As described above, the current shielding technique using the shielding plate is an effective means for improving the plating thickness distribution. However, depending on the type of tape-shaped products such as wide and multi-row, and the required plating thickness standard range, Adjustments and responses are required. However, in each case, it is very troublesome to completely replace the shielding plate 17 in the plating tank 12, and as a result, the current density is often reduced.

  An object of the present invention is to provide an electrolytic plating apparatus and an electrolytic plating method capable of solving the above-described problems, easily adjusting / changing a current shielding structure by a shielding plate, and achieving uniform plating thickness.

  In order to solve the above problems, the present invention is configured as follows.

  According to a first aspect of the present invention, there is provided a tape-shaped product in which at least one anode is provided vertically in a plating treatment tank filled with a plating solution and has a conductor portion to be subjected to electrolytic plating treatment, with its surface vertical. In the electroplating apparatus provided with an insulating shield plate having an opening between the anode and the tape-like product, the shield plate is a main shield. An electroplating apparatus characterized in that a plate and a secondary shield plate for adjusting the opening of the main shield plate are overlapped.

  According to a second aspect of the present invention, in the electroplating apparatus according to the first aspect, the sub shield plate is provided so as to be removable from the plating tank.

  According to a third aspect of the present invention, in the electrolytic plating apparatus according to the first aspect or the second aspect, the secondary shielding plate is installed on the tape-shaped product side of the main shielding plate. .

  According to a fourth aspect of the present invention, in the electroplating apparatus according to any one of the first to third aspects, the sub-shielding plate is the tape-shaped product with respect to the tape-shaped product having the multiple rows of the conductor portions. It has the opening corresponding to the said conductor part of each row | line | column of a product, It is characterized by the above-mentioned.

  According to a fifth aspect of the present invention, in the electroplating apparatus according to any one of the first to fourth aspects, the vertical width of the opening of the secondary shielding plate is set to be narrower than the width of the conductor portion of the tape-shaped product. It is characterized by that.

  According to a sixth aspect of the present invention, in the electrolytic plating apparatus according to any one of the first to fifth aspects, the upper and lower end portions of the opening of the secondary shielding plate are projected to the inside of the opening of the main shielding plate. A plurality of protrusion shielding portions are formed along the upper and lower end portions.

  According to a seventh aspect of the present invention, in the electroplating apparatus according to any one of the first to sixth aspects, the main shielding plate has a lower end portion installed on the bottom surface in the plating tank, and an upper end portion thereof. Is provided so as to protrude from the plating solution surface.

  According to an eighth aspect of the present invention, in the electrolytic plating apparatus according to any one of the first to seventh aspects, the main shielding plate has a thickness of 20 to 50 mm, and the sub-shielding plate has a thickness of 5 to 10 mm. It is characterized by that.

  In a ninth aspect of the present invention, at least one or more anodes are provided vertically in a plating tank filled with a plating solution, an insulating shielding plate having an opening facing the surface of the anode is provided, In the electroplating method in which a tape-shaped product having a conductor portion to be plated is transported in the vicinity of the shield plate on the side opposite to the anode and the conductor portion is plated, the main shield plate is used as the shield plate. The electrolytic plating method is characterized in that a shielding plate on which a secondary shielding plate for adjusting the opening of the main shielding plate is overlapped is used.

  According to a tenth aspect of the present invention, in the electroplating method according to the ninth aspect, the electroplating is performed based on a result of a plating thickness distribution of a conductor portion of the tape-shaped product electroplated using the shielding plate. The sub shield plate used is changed to another sub shield plate having a vertical width or opening shape different from that of the sub shield plate to adjust the plating film distribution.

  According to the present invention, the current shielding structure by the shielding plate can be easily adjusted and changed, and a tape-like product having a uniform plating thickness can be obtained.

  Hereinafter, embodiments of an electrolytic plating apparatus and an electrolytic plating method according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an outline of an electroplating apparatus that performs nickel plating and gold plating on a TAB tape 3 that is a tape-like product as an example of an electroplating apparatus using a reel-to-reel production method used for electroplating according to the embodiment. A typical planar arrangement is shown.

  In the reel-to-reel process, as shown in FIG. 1, the TAB tape 3, which is a tape-like product to be electroplated, is unwound from the reel 2 set in the unwinding section 1, and the reel 2 of the winding section 9 is electrolyzed. The plated TAB tape 3 is wound up. The transport path (pass line) of the TAB tape 3 between the reel 2 of the unwinding unit 1 and the reel 2 of the winding unit 9 includes a pretreatment tank 4, a nickel plating tank 5, a gold plating tank 6, A post-cleaning tank 7 and a drying tank 8 are installed. Power feeding rolls 10 are respectively provided before and after the nickel plating tank 5 and the gold plating tank 6. An anode is installed in the nickel plating tank 5 and the gold plating tank 6.

2A is a perspective view showing a positional relationship between the power supply roll 10 and the TAB tape 3, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2A. As shown in FIG. 2, the power supply roll 10 is rotatably provided so that the power supply roll 10 rotates and contacts the power supply pattern 11 that is a conductor portion of the TAB tape 3 when the TAB tape 3 is conveyed.
In terms of electrical circuit, since the rectifier (plating power source) (not shown) is connected to the anode in the plating tanks 5 and 6 and the negative side is connected to the power supply roll 10, the conductor portion of the TAB tape 3 is If a voltage is applied in the state of the plating tanks 5 and 6, current flows and nickel ions in the plating solution are deposited on the conductor portions of the TAB tape 3 such as the conductor pattern 15 and the power feeding pattern 11 by electrolytic reaction. become.

(First embodiment)
FIG. 3 shows the electroplating apparatus of the first embodiment provided with a shielding plate 20 suitable for a single-row TAB tape 3. 3A is a cross-sectional view of the plating tank (plating tank) 12 perpendicular to the conveying direction of the TAB tape 3, and FIG. 3B is a front view of the sub-shield 19 and FIG. These are sectional views perpendicular to the transport direction of the TAB tape 3 showing the arrangement of the shielding plate 20 and the TAB tape 3.

As shown in FIG. 3A, the plating tank 12 is filled with a plating solution 13, and the anode 14 is vertically arranged in the plating tank 12. The TAB tape 3 to be electroplated is conveyed through the plating tank 12 in the horizontal direction (direction perpendicular to the paper surface of FIG. 3) along the anode 14 while facing the anode 14 with the surface thereof vertical. .
A positive side of a rectifier (plating power source) is connected to the anode 14 in the plating tank 12, and a negative side of the rectifier is connected to a power supply roll. Therefore, if a voltage is applied in a state where the TAB tape 3 is in the plating tank 12, a current (current line) C flows and nickel ions or the like in the plating solution 13 are on the conductor portion (conductor pattern, etc.) 15 of the TAB tape 3. It will be deposited by electrolytic reaction.
In the case of nickel plating, the structure of the anode 14 is generally a structure in which a titanium basket is filled with nickel chips and the entire titanium basket is wrapped with a liquid-permeable anode bag. In the case of gold plating, an insoluble type in which the surface of a titanium plate or a mesh-like plate processed from a titanium plate is platinum-plated is often used.

Between the anode 14 and the TAB tape 3, an insulating shielding plate 20 that blocks a part of the current C is provided. The shielding plate 20 is installed close to the transport path (pass line) of the TAB tape 3. As shown in the figure, the shielding plate 20 is obtained by superimposing a main shielding plate 18 and a secondary shielding plate 19 having an opening 19a for adjusting the opening 18a of the main shielding plate 18. This first
In this embodiment, both the opening 18a of the main shielding plate 18 and the opening 19a of the secondary shielding plate 19 have a rectangular shape having a vertical width corresponding to the width of the conductor portion 15 of the TAB tape 3 as shown in the figure.

As shown in FIG. 3, the main shielding plate 18 is basically an opening 18a having a width (vertical width) that matches the width of the conductor portion 15 of the TAB tape 3 (the width of the plating area). The current C is shielded at the upper and lower portions of the opening 18a. The lower side of the main shielding plate 18 is preferably installed on the bottom surface of the plating tank 12, and the upper side of the main shielding plate 18 is preferably protruded from the surface of the plating solution 13.
As a material of the main shielding plate 18, it is preferable to use vinyl chloride resin or the like in consideration of insulation, strength, and chemical resistance. The thickness of the main shielding plate 18 is desirably about 20 to 50 mm. For the purpose of the main shielding plate, it is considered that the thickness (depth) can be ensured to be 20 mm or more. For example, if current shielding can be ensured by forming the outer peripheral portion surrounding the opening 18a in a bowl shape. The main shielding plate 18 may be made thinner. In order to insert the secondary shielding plate 19 between the main shielding plate 18 and the tape-like product, the main shielding plate 18 is installed at a position away from the pass line of the tape-like product by the distance expected.

As shown in the figure, the secondary shield plate 19 is installed on the pass line side of the TAB tape 3 of the primary shield plate 18 along the primary shield plate 18. The secondary shield plate 19 is provided so as to be detachable from above the plating tank 12, and the secondary shield plate 19 having an appropriate opening 19a matching the conductor width of the TAB tape 3 or the like is selected and used.
The opening 19a of the sub shield 19 is based on an opening width that matches the width of the conductor portion 15 (the width of the plating area) of the TAB tape 3 that is a tape-like product, similarly to the main shield 18.

However, as a result of the plating thickness distribution, for example, when the plating thickness at the end of the conductor portion 15 is large, the width of the opening 19a of the secondary shielding plate 19 is slightly narrower than the width of the conductor portion 15 to It is preferable to adjust the shielding portion of the shielding plate 19 so as to cover the conductor portion 15 portion of the tape-like product.
When the width of the conductor part of the TAB tape 3 or the like which is a tape-like product is expected to be slightly different for each product type, the width of the conductor part is the maximum width of the opening 18a of the main shielding plate 18. In accordance with a certain type, it is preferable to use a sub shield plate 19 having an opening 19a having a slightly different conductor width for each type.

  The main shielding plate 18 is basically fixedly provided in the plating tank 12, while the sub-shielding plate 19 is provided so as to be easily replaceable when changing the product type of the tape-like product. Therefore, it is preferable that the secondary shield plate 19 has a structure that can be easily inserted and removed from the upper side of the plating tank 12 or the like. The secondary shield plate 19 is preferably made of a vinyl chloride resin having a thickness of about 5 to 10 mm because a material that can be easily processed and manufactured is desirable. In order to facilitate the insertion / removal of the secondary shielding plate 19, a guide frame (guide groove) or an insertion frame (insertion groove) for guiding and holding the secondary shielding plate 19 is used as the plating tank 12 or the primary shielding plate. 18 should be provided.

The state after the secondary shield plate 19 is installed is designed so that it can be inserted at a position about 1 to 5 mm away from the pass line of the tape-like product in consideration of current shielding. The closer the shielding plate 20 is to the tape-like product, the more current distribution that is closer to the opening shape is obtained. However, if it comes into contact, it may cause scratches and scratches, so it needs to be slightly separated. Ideally, about 1-2 mm is good, but the effect is high up to about 5 mm.
If the thickness of the shielding plate 20 is 30 mm or more, the shielding effect of the sneak current from the anode 14 toward the conductor portion 15 of the TAB tape 3 serving as the cathode is high. However, since it becomes difficult to handle even if it is too thick, it is desirable that the total thickness of the main shielding plate 18 and the secondary shielding plate 19 is about 30 to 60 mm. If the thickness of the secondary shielding plate 19 is 5 to 10 mm, the thickness of the main shielding plate 18 is preferably about 20 to 50 mm. A secondary shield plate may be further installed on the anode 14 side of the main shield plate 18.

(Second and third embodiments)
FIG. 4 shows the electroplating apparatus of the second embodiment provided with a shielding plate suitable for the two-row TAB tape 3, and FIG. 5 shows a shielding plate suitable for the three-row TAB tape 3. 4 shows an electrolytic plating apparatus according to a third embodiment.

  As shown in FIG. 4, the shielding plate in the electrolytic plating apparatus of the second embodiment is configured by superimposing a main shielding plate 21 and a secondary shielding plate 22 as in the first embodiment. As shown in the figure, the main shielding plate 21 has an opening 21a that matches the width of the conductor portions 15 of the two rows of TAB tapes 3 (the width of the plating area). The secondary shielding plate 22 has two openings 22a and 22a having opening widths corresponding to the widths of the conductors 15 in two rows, and an elongated strip-shaped shielding part 22b between the openings 22a and 22a. Is formed.

  As shown in FIG. 5, the shielding plate in the electrolytic plating apparatus of the third embodiment is configured by superimposing a main shielding plate 23 and a secondary shielding plate 24 as in the first embodiment. As shown in the figure, the main shielding plate 23 has openings 23 a that match the width of the conductor portions 15 of the three rows of TAB tapes 3 (the width of the plating area). The secondary shield plate 24 has three openings 24a, 24a, 24a having opening widths corresponding to the widths of the three rows of the conductor portions 15, and an elongated strip-shaped shield portion 24b between the openings 24a. Is formed.

When the shielding plate 17 having no shielding member in the opening 17a as shown in FIGS. 9 (2) and 9 (3) is used for the multi-row TAB tape 3, the conductor portions 15 between the rows are arranged. The current C is concentrated at the end portion, and the plating thickness in the vicinity is increased.
On the other hand, as shown in FIGS. 4 and 5, a shielding portion 22 b and a shielding portion 24 b are provided between the openings 22 a and 22 a of the secondary shielding plate 22 and between the openings 24 a of the secondary shielding plate 24. Therefore, the current C can be prevented from concentrating on the end portions of the conductor portions 15 between the columns, and the plating thickness distribution can be made uniform.

  In the case of two rows (FIG. 4), three rows (FIG. 5) and multi-row arrangement, the openings 22a and 24a of the secondary shielding plates 22 and 24 are provided in each row as in the case of one row (FIG. 3). The opening is adapted to the width of the conductor portion 15. However, depending on the result of the plating thickness distribution, the width may slightly cover the conductor portion 15.

  By the current shielding method in which the opening width and opening shape of the shielding plate are matched to the conductor width, a high plating thickness distribution uniform effect can be obtained. However, in practice, the plating thickness distribution varies depending on the difference in the shape of the conductor pattern. If the plating thickness distribution when plating using a single secondary shielding plate is not satisfactory, it is recommended to adjust or change the opening width or opening shape of the secondary shielding plate after analyzing the plating thickness in detail. .

For example, in the case where the end of the conductor part of the wide product or the end of the conductor part of each row in the multi-row product obtained a thick result, the projection shielding part protruding to the inside of the opening of the main shielding plate, It is preferable to form a plurality along the upper and lower end portions of the opening of the sub shielding plate.
(Fourth embodiment)
Specifically, in the electroplating apparatus of the first embodiment suitable for the one-row TAB tape 3 shown in FIG. 3, the secondary shield plate as shown in FIG. 25 is used. A plurality of wedge-shaped (triangular) projection shielding portions 25 c are formed at equal intervals on the upper and lower ends of the opening 25 a of the sub-shielding plate 25. 6A is a front view of the secondary shield plate 25, FIG. 6B is a sectional view when the conductor portion 15 of the TAB tape 3 passes through the position of the AA line of FIG. 6A, and FIG. ) Is a cross-sectional view when the conductor portion 15 of the TAB tape 3 passes through the position of the BB line.
(Fifth embodiment)
Further, in the electroplating apparatus of the second embodiment suitable for the two-row TAB tape 3 shown in FIG. 4, a secondary shield plate 26 as shown in FIG. 7 is used instead of the secondary shield plate 22. . A plurality of wedge-shaped (triangular) projection shielding portions 26c are formed at equal intervals on the upper and lower ends of the two openings 26a, 26a of the sub-shielding plate 26. 7A is a front view of the secondary shield plate 26, FIG. 7B is a sectional view when the conductor portion 15 of the TAB tape 3 passes through the position of the AA line of FIG. 7A, and FIG. ) Is a cross-sectional view when the conductor portion 15 of the TAB tape 3 passes through the position of the BB line.

  By partially shielding the current C in the vicinity of the ends of the openings 25a and 26a of the sub-shielding plates 25 and 26, the plating thickness in the vicinity of the end of the conductor portion 15 can be suppressed. 6 and 7, the openings 25a and 26a of the sub shield plates 25 and 26 have the same width as the conductor width when the conductor portion 15 of the TAB tape 3 passes through the position near the line AA. This is because when the conductor portion 15 of the TAB tape 3 passes through the position near the −B line, the end portion of the conductor portion 15 is shielded by the projection shielding portions 25c and 26c. This method is an effective method in a reel-to-reel method in which a tape-shaped product is conveyed in the plating tank.

As described above, the shield plate has a structure in which the main shield plate and the secondary shield plate for adjusting the opening of the main shield plate are overlapped, and the appropriate opening width suitable for the conductor width of the tape-like product, the conductor pattern shape, By using a secondary shielding plate having an opening shape, the current shielding structure can be easily adjusted and changed, and a uniform plating thickness distribution can be realized.
Moreover, the plating thickness distribution can be improved for various varieties by replacing only the sub shield plate. Furthermore, since the sub-shielding plate can be easily inserted and removed, it can be easily replaced. As a result, the response when changing the product type can be performed very quickly. Also, since the plating thickness can be easily leveled, it is not necessary to reduce the current density, and productivity can be maintained at a high level.
Also, by analyzing the plating thickness distribution and changing the aperture shape etc. of the secondary shield plate, that is, by applying feedback to the aperture shape etc., it is possible to meet further demands for improving the plating thickness distribution (thickness standard range). It becomes.

  In the above embodiment, nickel plating and gold plating have been described. However, the present invention is naturally applicable to other metal types (such as copper). Moreover, in the said embodiment, although it was a tape-shaped product which has a conductor part (conductor layer) only on one side, it is necessary to perform electroplating on both surfaces with respect to the tape-shaped product which has a conductor part (conductor layer) on both surfaces. In some cases, the same problem can be solved by installing the shielding plate and the anode of the present invention on both sides of the pass line of the tape-like product.

  Next, examples of the present invention will be described.

(1) Preparation method of evaluation sample An Esperflex material (copper thickness: about 8 μm, polyimide thickness: about 38 μm) manufactured by Sumitomo Metal Mining was used as a TAB tape substrate, and a wiring pattern was formed through a photoetching process. The tape base material on which the wiring pattern was formed was subjected to nickel plating using the plating apparatus shown in FIG. Gold plating was not performed.
Here, several types of evaluation samples were produced by changing the structure of the shielding plate. The main shielding plate had a thickness of 30 mm, and was installed so that its end was located at a distance of 10 mm from the pass line of the tape substrate. The thickness of the sub shielding plate was 8 mm, and it was inserted from the upper side of the plating tank along the main shielding plate. At this time, the distance (interval) between the pass line of the tape base material and the end of the secondary shielding plate was 2 mm.
For the pretreatment of nickel plating, a sulfuric acid-based acid degreasing solution and a hydrogen peroxide-monosulfuric acid-based cuprate solution (chemical polishing solution) were used. For nickel plating, the current density was 4 A / dm ² , and the conveyance speed of the tape substrate was adjusted so that the plating time was 2 minutes. Under this condition, the average value (theoretical value) of the plating thickness is about 1.6 μm. The nickel plating thickness was measured using a fluorescent X-ray film thickness meter.

(2) Evaluation results Table 1 shows the nickel plating thickness measurement results for one-row products in which the width of the tape substrate is 105 mm and the width of the conductor pattern portion is 90 mm. In Example 1, the main shielding plate (90 mm which is the same as the width of the conductor pattern portion) and the secondary shielding plate (opening width 90 mm) shown in FIG. 3 were used. In Example 2, the main shielding plate (opening width 90 mm) of FIG. 3 and the secondary shielding plate (opening width 90 mm and having wedge-shaped protrusion shielding portions at the upper and lower ends of the opening) of FIG. 6 were used. . In Comparative Example 1, only the main shielding plate (opening width 90 mm) of FIG. 3 was used, and in Conventional Example 1, nickel plating was performed without using the shielding plate.

  Table 2 shows the nickel plating thickness measurement results of two-row products in which the width of the tape base material is 158 mm and the width of the conductor pattern portion is 61 mm in each row. In Example 3, the main shielding plate (131 mm which is the same as the width of the conductor pattern portions in two rows) and the secondary shielding plate (the opening width 61 mm which is the same as the width of each row) shown in FIG. 4 were used. In Example 4, the main shielding plate (opening width 131 mm) of FIG. 4 and the secondary shielding plate of FIG. 7 (opening width 61 mm and having wedge-shaped protrusion shielding portions at the upper and lower ends of the opening) were used. . In Comparative Example 2, only the main shielding plate (opening width 131 mm) of FIG. 4 was used, and in Conventional Example 2, nickel plating was performed without using the shielding plate.

From Table 1, the nickel plating thickness distribution could be made uniform under the conditions of Examples 1 and 2. Example 2 is a result of feeding back the analysis result of the film thickness distribution of Example 1 and processing the open end of the secondary shielding plate into a wedge shape (FIG. 6), and further improves the plating thickness. Obtained. That is, in Example 1, the difference between the maximum value and the minimum value of the nickel plating thickness on the conductor layer is 0.3.
Although it was 2 μm, in Example 2, it decreased to 0.12 μm. Comparative Example 1 is a case where only the main shielding plate is used. The shielding effect is obtained by setting the opening width of the main shielding plate to 90 mm, and the plating thickness distribution is compared with Conventional Example 1 which does not use the shielding plate. Has improved. However, it is considered that the shielding effect was weakened as compared with Example 1 because the distance between the pass line of the tape substrate and the shielding plate (main shielding plate) was 10 mm. In Conventional Example 1, it was confirmed that the variation in plating thickness was large.

  Also from Table 2, it was confirmed that the distribution of nickel plating thickness could be improved under the conditions of Examples 3 and 4. Example 4 feeds back the analysis result of the film thickness distribution of Example 3, and is the result when the open end of the secondary shielding plate is processed into a wedge shape (FIG. 7). The effect of improving the plating thickness was obtained. The comparative example 2 is a case where only the main shielding plate is used. The shielding effect is obtained by setting the opening width of the main shielding plate to 131 mm, and the plating thickness distribution is compared with the conventional example 2 which does not use the shielding plate. Has improved. However, since the distance between the pass line of the tape base material and the shielding plate (main shielding plate) is 10 mm, it is considered that the shielding effect is weakened as compared with Example 3. In Conventional Example 2, it was confirmed that the variation in plating thickness was large.

1 is a schematic plan view showing an example of an electroplating apparatus using a reel-to-reel production method used for electroplating according to an embodiment of the present invention. The arrangement | positioning of the electric power feeding roll 10 of FIG. 1 and the TAB tape 3 is shown, (a) is a perspective view, (b) is bb sectional drawing of (a). It is a figure which shows the electroplating apparatus of 1st Embodiment provided with the shielding board suitable for the TAB tape of 1 row. It is a figure which shows the electroplating apparatus of 2nd Embodiment provided with the shielding board suitable for the TAB tape of 2 rows. It is a figure which shows the electrolytic plating apparatus of 3rd Embodiment provided with the shielding board suitable for the TAB tape of 3 rows. It is a figure which shows other embodiment of the sub-shielding board suitable for the TAB tape of 1 row | line taking. It is a figure which shows other embodiment of the secondary shielding board suitable for the TAB tape of 2 rows. The conventional electroplating apparatus is shown, (1)-(4) are all sectional views perpendicular to the transport direction of the TAB tape. The conventional electroplating apparatus is shown, (1)-(3) are all sectional views perpendicular to the transport direction of the TAB tape.

Explanation of symbols

1 Unwinding part 2 Reel 3 TAB tape (tape-like product)
4 Pre-treatment tank 5 Nickel plating tank 6 Gold plating tank 7 Post-cleaning tank 8 Drying tank 9 Winding part 10 Feed roll 11 Feed pattern 12 Plating tank 13 Plating solution 14 Anode 15 Conductor part (conductor pattern)
18 Main shielding plate 18a Opening 19 Sub shielding plate 19a Opening 20 Shielding plates 21, 23 Main shielding plates 22, 24 Sub shielding plates 21a, 22a, 23a, 24a Openings 22b, 24b, 26b Shielding portions 25c, 26c Projection shielding portion C Current (Current line)

Claims (10)

At least one or more anodes are provided vertically in a plating tank filled with a plating solution, and a tape-like product having a conductor portion to be electroplated is placed on the anode while facing the anode with its surface vertical. In the electroplating apparatus provided with an insulating shielding plate having an opening between the anode and the tape-shaped product,
The electroplating apparatus, wherein the shielding plate is configured by superimposing a main shielding plate and a secondary shielding plate for adjusting an opening of the main shielding plate.   The electroplating apparatus according to claim 1, wherein the sub shield plate is provided so as to be removable from the plating tank.   The electroplating apparatus according to claim 1, wherein the sub shield plate is installed on the tape-like product side of the main shield plate.   4. The tape-shaped product having multiple rows of the conductor portions, the secondary shield plate has openings corresponding to the conductor portions of each row of the tape-shaped product. Electrolytic plating apparatus according to the above.   The electroplating apparatus according to any one of claims 1 to 4, wherein a vertical width of the opening of the sub shielding plate is set to be narrower than a width of a conductor portion of the tape-shaped product.   A plurality of protrusion shielding portions projecting inward of the opening of the main shielding plate are formed at upper and lower ends of the opening of the secondary shielding plate along the upper and lower ends. The electrolytic plating apparatus in any one of claim | item 1 -5.   The main shield plate has a lower end portion installed on a bottom surface in the plating tank and an upper end portion protruding from the plating solution surface. The electroplating apparatus of description.   The thickness of the said main shielding board is 20-50 mm, The thickness of the said secondary shielding board is 5-10 mm, The electroplating apparatus in any one of Claims 1-7 characterized by the above-mentioned. At least one or more anodes are provided vertically in a plating tank filled with a plating solution, an insulating shielding plate having an opening is provided so as to face the surface of the anode, and the shielding plate on the opposite side of the anode In the electroplating method of transporting a tape-shaped product having a conductor portion to be plated in the vicinity of the plate, and plating the conductor portion,
An electrolytic plating method characterized in that a shielding plate in which a main shielding plate and a secondary shielding plate for adjusting an opening of the main shielding plate are overlapped is used as the shielding plate.   Based on the result of the plating thickness distribution of the conductor portion of the tape-shaped product electroplated using the shielding plate, the sub-shielding plate used for the electroplating has a vertical width of an opening different from the sub-shielding plate or The electrolytic plating method according to claim 9, wherein the plating thickness distribution is adjusted by changing to another sub-shielding plate having an opening shape.

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