JP2985651B2 - Partially plated resin product and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin product in which only a portion of the surface of a resin base material that requires plating is partially plated, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as this kind of technology, for example, JP-A-55-152195 and JP-A-52-5093 are known.
No. 7 has been proposed. In these techniques, as shown in FIG.
The part of the surface that needs plating (left side in the figure)
A groove 52 having a substantially V-shaped cross section is formed at a boundary portion between the portion and the portion that does not require plating (the right side in the drawing). Then, the base material 51 is first subjected to electroless plating.
At this time, the plating solution does not reach the bottom 52a of the groove 52 because the gap is narrow. Therefore, the bottom portion 52a is basically not plated. In other words, the electroless plating layer 23 is formed on all parts except the bottom 52a.

[0006] Next, as shown in FIG. 16, the substrate 51 on which the electroless plating layer 53 is formed is subjected to electroplating. That is, the same substrate 51 is immersed in a predetermined electroplating solution,
A portion requiring plating is electrically connected. Then, the electroless plating layer 53 formed in a portion that does not require plating is dissolved by the electroplating solution. Also,
In a part requiring plating, the electroless plating layer 5
On the surface of No. 3, an electroplating layer 54 is formed. In this way, the electroless plating layer 53 and the electroplating layer 54 are formed on the base material 51 only in the portions requiring plating. In other words, through the above steps, a so-called partially plated resin product 55 is obtained.

[0004]

However, in the above-mentioned prior art, the width and depth of the groove 52 have not been specifically studied. Therefore, for example, when the ratio of the depth to the width of the groove 52 is too small, there is a possibility that the electroless plating layer 53 may be formed up to the bottom 52 a of the groove 52. Also, groove 5
If the ratio of the depth to the width of 2 is too large,
Regardless of the presence of 2, there is a possibility that the electroless plating layer 53 may be formed in a bridging manner. In such a case, the electroplating layer 5 is formed up to a portion not requiring plating.
4 was likely to be formed. As a result, there is a possibility that the desired partially plated resin product 55 cannot be obtained.

Further, in the above-mentioned prior art, the grooves 52
Although no particular reference is made to the cross-sectional shape of the bottom portion 52a, it is recognized that the cross-sectional shape is formed in an acute angle (V-shaped cross section). That is, the bottom 52a
The more the cross-sectional shape is an acute angle, the more difficult it is to form the electroless plating layer 53 on the bottom portion 52a, and as a result, it becomes easier to obtain a desired partially plated resin product 55. When forming the groove 52, a ridge corresponding to the shape of the groove 52 is integrally formed in a mold for molding the base material 51.

[0006] However, it has been substantially extremely difficult to form a ridge having a completely acute cross section in the fabrication of the mold. That is, when viewed from a microscopic field of view, it can be considered that the cross-sectional shape of the above-mentioned ridge is formed at least substantially in a curved shape. On the other hand, the cross-sectional shape of the ridge (as a result, the bottom 52a of the groove 52)
When the shape of the cross section is strictly sharp, not only the processing of the mold becomes extremely difficult, but also the protruding portion of the mold is easily chipped, and the durability of the mold is reduced. There was a risk of lowering. As a result, when the bottom 52a having an acute cross-sectional shape is to be formed, the manufacturing cost of the base material 51, and thus the manufacturing cost of the resin product 55, may be extremely high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to obtain a resin product which has been partially plated, and to reliably perform partial plating only on a portion requiring plating. It is an object of the present invention to provide a partially plated resin product which can be formed and which is not likely to cause an increase in cost during manufacture, and a method of manufacturing the same.

[0008]

In order to achieve the above object, according to a first aspect of the present invention, a boundary line between a portion requiring plating and a portion not requiring plating is provided on the surface of a resin base material. By forming a groove having a substantially V-shaped cross section on the portion so as to form a ring or a part of a ring, applying electroless plating to the base material, and then performing electroplating on a portion requiring plating. A resin product in which a plating layer is formed only on a portion that requires plating on the surface of the base material,
The relationship between the radius of curvature r1 of the cross-section curved portion at the bottom of the groove and the ratio of the depth D to the width W of the groove is expressed by the following two equations: ratio (D / W)> 6.7 * r1 + 1. The gist is that the ratio (D / W)> 180 * r1-15.7 is satisfied.

Further, in the second invention, a groove having a substantially V-shaped cross section is formed on a boundary portion between a portion requiring plating and a portion not requiring plating on the surface of the resin base material. Forming an annular or annular part of the groove, an electroless plating step of forming an electroless plating layer on the surface of the base material other than the bottom of the groove, and the electroless plating Of the electroless plating layer formed on the base material that has undergone the process, a portion requiring plating is electrically connected to form an electroplating layer on a portion requiring plating on the electroless plating layer. Comprising a step of electroplating, a method for manufacturing a resin product having a plating layer formed only on a portion of the surface of the base material that requires plating, wherein a cross-sectional curved portion at the bottom of the groove is formed. The radius of curvature r1 and the depth of the groove relative to the width W The point is that the relationship with the ratio was satisfied such that the following two ratios (D / W)> 6.7 * r1 + 1.0 ratio (D / W)> 180 * r1-15.7 And

In the above two inventions, the ratio (D / W)> 18
If 0 * r1-15.7 is not satisfied, an electroless plating layer may be formed at the bottom of the groove. When the ratio (D / W)> 6.7 * r1 + 1.0 is not satisfied, the electroless plating layer may be formed at the bottom of the groove or the electroless plating layer may straddle the groove. To form a bridge.

[0011]

According to the structure of the first aspect of the present invention, a substantially V-shaped cross section is formed at the boundary between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. A groove is formed. Then, electroless plating is performed on the base material. At this time, since the plating solution does not reach the bottom of the groove, electroless plating is performed on a portion other than the bottom. Thereafter, electroplating is performed on the portions that require plating. At this time, the plating solution dissolves the electroless plating in a portion that does not require plating. Then, electroplating is performed only on the portions that require plating after the electroless plating is performed.

At this time, the ratio of the radius of curvature r1 of the cross-section curved portion at the bottom of the groove and the depth D to the width W of the groove is calculated by the following two ratios (D / W)> 6.7 *. It is formed so as to satisfy r1 + 1.0 ratio (D / W)> 180 * r1-15.7. For this reason, the solution for electroless plating does not easily reach the bottom of the groove, and there is no possibility that the electroless plating layer is formed on the bottom. Further, the electroless plating layer is not formed so as to bridge the groove.

Furthermore, since it is not necessary to form the cross-sectional shape of the bottom of the groove at a perfect acute angle, difficulty in molding the base material is reduced. In the second invention, in the groove forming step, a substantially V-shaped cross section is formed on a boundary portion between a portion requiring plating and a portion not requiring plating on the surface of the resin-made base material. Are formed so as to form an annular shape or a part of an annular shape. In the electroless plating step, the plating solution does not reach the bottom of the groove, and an electroless plating layer is formed on a portion of the base material surface other than the bottom of the groove. In the electroplating step, a portion of the electroless plating layer formed on the substrate that has undergone the electroless plating step is electrically connected to a portion of the electroless plating layer that requires plating, and a portion of the electroless plating layer that requires plating is electrolessly plated. An electroplating layer is formed. Thereby, a plating layer is basically formed only on a portion of the surface of the base material that requires plating.

Also in the present invention, the ratio of the radius of curvature r1 of the cross-section curved portion at the bottom of the groove and the depth D to the width W of the groove is expressed by the following two ratios (D / W)> 6. 0.7 * r1 + 1.0 ratio (D / W)> 180 * r1-15.7. For this reason, an operation equivalent to that of the first invention is provided.

[0015]

【Example】

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 2 and 3, a mark plate 2 as a resin product is mounted at a predetermined position of the automobile. On the surface of the mark plate 2,
A mark 1 shaped like the letter "T" is formed.
The mark plate 2 has a substantially disk shape and is made of ABS.
Mark plate main body 3 as a resin base material and partially formed plating layer 4 (parts other than the mesh pattern in FIG. 2)
It is composed of That is, as shown in FIGS. 1 to 3, annular grooves 5 having a substantially V-shaped cross section are formed on the surface of the mark 1 so as to form a letter "T". . The plating layer 4 is formed in a portion other than the portion surrounded by the grooves 5 (the portion of the mesh pattern in FIG. 2).

As shown in FIG. 1, the plating layer 4 comprises an electroless plating layer 6 and an electroplating layer 7. In this embodiment, the electroless plating layer 6 is made of nickel.
The thickness is about 0.3 to 0.4 μm. The electroplating layer 7 is formed of three kinds of metals, copper, nickel and chromium, to a thickness of about 20 to 50 μm, and has a multilayer structure.

The bottom 5a of the groove 5 is as follows.
For the sake of molding, the cross-sectional shape is microscopically curved. In this embodiment, the radius of curvature r1 in the cross-sectional shape of the bottom 5a is, for example, “0.1 m
m ”.

As for the size of the groove 5, for example, the width W is formed to be "0.5 mm" and the depth D is formed to be "0.7 mm". However, the width W is not particularly limited, but is preferably “0.3 mm” or more from the viewpoint of processing, and is preferably “1.0 mm” or less from the viewpoint of improving design. Also, the depth D is not particularly limited, but is also “0.3 mm” due to processing restrictions.
The above is preferred. Further, in this embodiment, the ratio (D / W) of the depth D to the width W is formed to be larger than “1.0”, and the ratios (D / W) of the following equations (1) and (2) are obtained. W)> 6.7 * r1 + 1.0 The ratio (D / W)> 180 * r1-15.7 is satisfied. In this embodiment, the above equations (1),
The requirement (2) must be satisfied. The upper limit of the ratio (D / W) is not particularly limited, but if the thickness of the mark plate body 3 or the like is present as in the present embodiment, the ratio (D / W) may be reduced. Is desirably “5.0” or less. More preferably, "4.
0 "or less, and if it is" 3.0 "or less, processing becomes extremely easy.

Further, in the present embodiment, the cross-sectional shape of the boundary between the groove 5 and the surface of the mark plate body 3 is also microscopically curved. More specifically, the cross-sectional shape of the boundary portion has a curvature radius r2 of “0.2 m
m or more ("0.3 mm" in the present embodiment). The grooves 5 are formed at the same time when the mark plate body 3 is formed by a mold.

Next, a description will be given of the operation and effect of manufacturing the above-described mark plate 2, that is, performing partial plating. First, as shown in FIG. 4, the mark plate main body 3 having the above-described groove 5 is formed by a known molding method. Then, as shown in FIG. 5, the mark plate body 3 is immersed in an electroless plating solution to perform electroless plating. At this time, the plating solution does not reach the bottom 5a of the groove 5 because the gap is narrow. Therefore, no plating is applied to the bottom 5a. In other words, the bottom 5 of the surface of the mark plate body 3
An electroless plating layer 6 is formed on all parts except a.

Next, as shown in FIG. 1, the mark plate body 3 on which the electroless plating layer 6 is formed is subjected to electroplating. That is, the main body 3 is immersed in a predetermined electroplating solution a plurality of times, and a portion requiring plating (a tip side portion of the mark 1) is electrically conducted. Then
The electroless plating layer 6 formed in a portion not requiring plating is dissolved by the electroplating solution. In a portion requiring plating, the electroplating layer 7 having the above-described multilayer structure is formed on the surface of the electroless plating layer 6 (left side in the drawing). Thus, as shown in FIG.
The mark plate 2 on which the electroless plating layer 6 and the electroplating layer 7 are formed only at a predetermined portion of the mark 1.

In this embodiment, the bottom 5 of the groove 5 is used.
a and the width W of the groove 5
The ratio (D / W) of the depth D to
It is formed so as to satisfy (2). Therefore, there is no possibility that the electroless plating solution does not reach the bottom 5a of the groove 5 and the electroless plating layer 6 is formed. Further, the electroless plating layer 6 is not formed in a bridging manner so as to straddle the groove 5. Therefore, the plating layer 4 can be reliably formed only on a portion requiring plating, and a desired mark plate 2 can be reliably obtained.

Here, in order to confirm the above-mentioned effects, the radius of curvature r1 and the width W of the cross-sectionally curved portion of the bottom 5a of the groove 5 are described.
An experiment was conducted as to whether or not the plating layer 4 could be reliably formed only in a portion requiring plating when the ratio (D / W) of the depth D to D was variously changed.
The results will be described below.

FIG. 6 shows the curvature radius r1 of the cross-section curved portion of the bottom 5a of the groove 5 as the horizontal axis, the ratio of the depth D to the width W (D / W) as the vertical axis, and these two parameters are variously changed. When the mark plate body 3 is formed by
It is a graph which shows the result of having judged the success or failure of partial plating.
Specifically, the width W is set to “0.3 mm”, “0.5 mm”,
At the level of “0.7 mm”, the parameter of the depth D was variously changed. In the figure, the white circles indicate that the plating layer 4 could be reliably formed only on the portions requiring plating. The black circle indicates the bottom 5 a of the groove 5.
The electroless plating layer 6 is formed on the substrate, or the electroless plating layer 6 is formed bridging over the groove, so that the plating layer 4 is formed only on the portion requiring plating. Indicates that it was not possible.

As shown in the figure, in the present embodiment, the requirement (ratio (D / W)> 6.7 * r) of the above equations (1) and (2) is used.
1 + 1.0 and the ratio (D / W)> 180 * r1-
When 15.7) was satisfied, the plating layer 4 could be surely formed only in a portion requiring plating.
On the other hand, when the above requirements are not satisfied, the electroless plating layer 6 is formed at the bottom 5a of the groove 5 or the electroless plating layer 6 is formed so as to bridge the groove. As a result, it was not possible to form the plating layer 4 only on the portion requiring plating.

Further, in the present embodiment, unlike the above-mentioned prior art in which the cross-sectional shape of the bottom of the groove has to be formed at an acute angle, the cross-sectional curved portion of the bottom 5a of the groove 5 has a predetermined curvature. What is necessary is just to be a shape. For this reason, even when processing the ridge of the mold for forming the bottom portion 5a, the processing can be performed without any difficulty. Further, when the ridges of the mold are formed strictly at an acute angle, there is a problem that the durability of the ridges is reduced and breakage or the like is likely to occur. It won't happen. As a result, in forming the mark plate main body 3 having the groove 5 having the above-described shape, difficulty in forming the mark plate body 3 is reduced, and it is possible to suppress an increase in manufacturing cost.

Further, the following effects can be mentioned as additional effects in this embodiment. That is, the cross-sectional shape of the boundary between the groove 5 and the mark plate main body 3 is formed in an arc shape having a curvature radius r2 of “0.2 mm or more”. Therefore, the electroplating layer 7 does not concentrate on this boundary portion, and the electroplating layer 7 is not formed by diffusion in this portion. As a result, the above effect that partial plating can be applied only to a necessary portion can be further ensured.

Further, the groove 5 and the mark plate body 3
The "flower blooming phenomenon (phenomenon in which the electroplating layer is diffused and formed)" which may occur when the boundary portion between the plating layer and the electrode is formed in a square shape does not occur, and the parting-off portion of the plating layer 4 does not occur. Are clearly formed in appearance. As a result, the parting line of the plating layer 4 can be made clear and clear, and the appearance quality can be significantly improved.

(Second Embodiment) A second embodiment in which the present invention is embodied in a vehicle front grill 21 as a resin product will be described below with reference to FIGS. However, also in this embodiment, the essence of the invention is substantially the same as that of the above-described first embodiment. Therefore, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description will be simplified.

A front grill 21 as shown in FIG. 7 is mounted on the front of the vehicle. FIG.
As shown in FIGS.
Front grill body as base material made of BS resin
And a plating layer 23 (a mesh-like portion in FIG. 8) formed on a part of the design surface, that is, a part of the front surface.
3 (except for a part of the back side). More specifically, the front grill 21 includes a frame 25 having a substantially rectangular front surface, a plurality of sub-partitioning plates 26 extending in the horizontal direction in the frame 25, and a frame 25.
A plurality of connecting plates 27 extending in the vertical direction in the inside, a mounting plate 28 for mounting a mark plate (not shown: different from that of the first embodiment) at the center, and the mounting plate 28 from the frame 25 toward the mounting plate 28 It has a main partition plate 29 that extends. The plating layer 23 is formed mainly on the front side of the frame 25 and on the front side of the main partition plate 29. In addition, the sub-partition plate 26,
The coating layer 24 is formed mainly on the front side of the mounting plate 28 and the connecting plate 27.

FIG. 9 is an enlarged front view showing a part (α portion in FIG. 8) of the main partition plate 29, and FIG.
It is a B sectional view. As shown in these figures and FIGS. 8 and 11, in the front side portion of the grill main body 22, the boundary between the plating layer 23 and the coating layer 24 protrudes vertically from the frame 25 and the main partition plate 29. Front side step 30
Are formed in an annular shape. And this front side step part 3
At 0, a groove 31 having a substantially V-shaped cross section is formed in an annular shape (closed curve shape). Also, in the back side portion of the grill main body 22, a boundary portion between the plating layer 23 and a portion where the plating layer 23 is not formed is provided with a groove 3 having a substantially V-shaped cross section.
3 is formed in an annular shape. Further, an electrode projection 34 protruding toward the rear surface (toward the rear of the vehicle) is formed on the rear surface side portion (β portion in FIG. 8) of the grill main body 22.

As shown in FIGS. 11 and 12, the plating layer 23 includes an electroless plating layer 35 and an electroplating layer 36. In this embodiment, the electroless plating layer 35 and the electroplating layer 36 are formed with the same composition as in the first embodiment.

Also in this embodiment, the groove 3
The size of 1, 33 satisfies the two requirements in the first embodiment. That is, the grooves 31, 33
The relationship between the radius of curvature r1 of the cross-section curved portion of the bottom 31a and the ratio of the depth D to the width W (D / W) is given by the above equation (1).
(2) is satisfied.

Next, a description will be given of the operation and effect of manufacturing the above-described front grill 21, that is, performing partial plating. First, using a mold not shown,
The grill main body 22 in which the grooves 31 and 33 are respectively formed at predetermined positions in an annular shape is formed.

Subsequently, the grill main body 22 is immersed in an electroless plating solution to perform electroless plating. At this time, FIG.
As shown in FIG. 12, the plating solution does not reach the bottom 31a of the two grooves 31 and 33 because the gap is small. (However, in FIGS. 13 and 14, only the front grooves 31 are provided for convenience of explanation. However, the same can be said for the groove 33 on the back surface side). Therefore, these bottoms 3
No plating is applied to 1a. In other words, the electroless plating layer 35 is formed on all portions except the bottom 31a of the grooves 31 and 33 on the surface of the grill main body 22.

Next, as shown in FIG. 14, the grill main body 22 on which the electroless plating layer 35 is formed is subjected to electroplating. That is, the main body 22 is immersed in a predetermined electroplating solution a plurality of times, and the portions requiring plating (mainly the front side portion of the frame 25 and the front side portion of the main partition plate 29) are electrically conducted. At this time, the electrode projections 3 protruding from the back side of the grill main body 22 are formed.
4 is one electrode. Then, the electroless plating layer 35 formed in a portion that does not require plating is dissolved by the electroplating solution. In a portion requiring plating, the electroplating layer 36 having the above-described multilayer structure is formed on the surface of the electroless plating layer 35 (the lower side in the figure). In this way, the grill main body 22 on which the electroless plating layer 35 and the electroplating layer 36 (plating layer 23) are formed only in a portion requiring plating is formed.

Thereafter, the portion where the plating layer 23 is formed is covered with an electroformed mask (not shown). That is,
The electroformed mask is a metal plate having a thickness of “several mm” and has a shape conforming to the shape of the front grill 21. Further, the electroformed mask is appropriately formed with an opening which is opened only at a portion necessary for forming the coating layer 24. By the coating of the electroformed mask, a portion necessary for forming the coating layer 24 is exposed from the opening. Then, spray coating is performed on the exposed portion. By this coating, a coating film layer 24 is formed at a necessary portion of the coating film.

Then, as shown in FIG.
Is formed, the covering of the electroformed mask is released, thereby obtaining the front grill 21 described above. That is, the plating layer 23 is provided mainly on the front side portion of the frame 25 and the front side portion of the main partition plate 29, and the coating layer 24 is provided mainly on the front side portion of the sub-partition plate 26, the mounting plate 28 and the connecting plate 27. The front grill 21 having the above is obtained.

According to this embodiment, when forming the plating layer 23, the radius of curvature r1 of the cross-sectionally curved portion of the bottom 31a of the grooves 31, 33 and the depth D with respect to the width W of the grooves 31, 33 are determined. The relationship with the ratio (D / W) is expressed by the above equation (1),
It is formed so as to satisfy (2). Therefore, there is no possibility that the electroless plating solution does not reach the bottom portions 31a of the grooves 31 and 33 and the electroless plating layer 36 is formed. Further, the electroless plating layer 36 is not formed so as to bridge the groove. Therefore,
The plating layer 23 can be reliably formed only on a portion requiring plating, and a desired front grill 21 can be reliably obtained. That is, the present embodiment also provides substantially the same operation and effect as the first embodiment.

In this embodiment, when forming the coating layer 24, the coating layer 24 can be formed directly on the grill main body 22 without the intervention of the primer layer.
As a result, the step of forming the primer layer is not required, so that the number of operation steps and the cost can be reduced. In addition, since it is not necessary to form the electroplating layer 36 on the entire surface of the grill main body 22, the cost can be reduced accordingly.

In the front grill 21, a coating layer 24 is formed directly on the grill main body 22. Therefore, the thickness of the portion is reduced as much as the plating layer 23 and the primer layer are not interposed. As a result, the thickness of the coating layer 24 can be reduced, and the appearance quality can be improved. Further, since the coating layer 24 and the grill main body 22 are both made of a resin material, the coating layer 24 is
Can be firmly joined to. Therefore, the durability of the coating layer 24 of the front grill 21 can be improved.

In addition, in this embodiment, the groove 31 on the front side serves as a boundary between the coating layer 24 and the plating layer 23.
For this reason, the parting part of the boundary part is formed not in a zigzag shape but sharply. As a result, the parting line can be made clear and clear, and the appearance quality can be further improved.

It should be noted that the present invention is not limited to the above-described embodiments, but may be implemented as follows, with a part of the configuration being appropriately changed without departing from the spirit of the invention. (1) In the first embodiment, among the boundary portions between the groove 5 and the mark plate main body 3, the cross-sectional shape of both the left and right boundary portions in FIG. 1 is curved, but partial plating is required. The cross-sectional shape of only the boundary portion (left portion) between the groove 8 of the portion to be formed and the mark plate main body 9 may be formed in a curved shape. Further, the configuration may be such that the cross-sectional shape of the boundary portion is not formed in a curved shape.

(2) In the first embodiment, the present invention is embodied in the disc-shaped mark plate 2, but the mark plate 2 does not have to be disc-shaped. Further, in the above-described embodiment, the present invention is embodied in the form of a letter "T" on the surface of the mark 1, but the shape of the portion to be plated is not particularly limited. In other words, the groove 5
If is formed in a ring, the part to be plated is
It may have any shape.

(3) In the first and second embodiments, the mark plate 2 and the front grille 21 are embodied as resin products, but the outer panel for the door mirror bracket, the back panel, the louver, the pillar garnish, It can also be embodied in various resin products such as quarter vents. In addition, the resin material constituting these base materials is
Various resin materials such as polypropylene, polyphenylene oxide, polyamide, polysulfone, and polyester may be used without being limited to ABS.

(4) Although the electroless plating layers 6 and 36 are formed of nickel in both of the above embodiments, they may be formed of copper or the like. Further, in the above-described embodiment, the electroplating layers 7 and 35 are formed to have a multilayer structure by using three kinds of metals of copper, nickel and chromium, but other metals may be used. The present invention may be embodied when not having a multilayer structure. The technical ideas which are not described in each claim of the claims but can be grasped from the above embodiments are described below together with their effects.

(A) In the resin product or the method of manufacturing the partially plated resin product according to claim 1 or 2, the sectional shape of the boundary between the groove and the substrate has a curvature radius r2 of “0”. .2 mm or more ". With the above configuration, the boundary portion includes:
The electroplating layer is not concentrated and deposited, and it is possible to prevent the electroplating layer from being diffused and formed in this portion.

(B) In the resin product or the method of manufacturing the partially plated resin product according to claim 1 or claim 2 or (a), the ratio (D / W) is not more than “5.0”. ,
Preferably, it is "4.0" or less, and more preferably, it is "3.0" or less. According to the above configuration, it is possible to easily form the groove on the base material.

[0050]

As described above in detail, according to the partially plated resin product and the method of manufacturing the same of the present invention, when a partially plated resin product is obtained, a portion requiring plating is required. Only in this case, it is possible to form the partial plating reliably, and it is possible to obtain an excellent effect that there is no possibility that the manufacturing cost is increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of a partially plated mark plate according to a first embodiment of the present invention.

FIG. 2 is a plan view schematically showing a mark plate in the first embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2 in the first embodiment.

FIG. 4 is a sectional view of a main part showing a mark plate body in the first embodiment.

FIG. 5 is a cross-sectional view of a main part showing a state in which electroless plating is applied to a mark plate main body in the first embodiment.

FIG. 6 shows the results of determining the success or failure of partial plating in the case where the mark plate body was formed by changing the ratio of the depth to the radius of curvature and the width of the cross-section curved portion at the bottom of the groove in the first embodiment. FIG.

FIG. 7 is a front view showing a front grill in a second embodiment embodying the present invention.

FIG. 8 is a diagram showing a plated portion of a front grill in the second embodiment, and is a schematic diagram in which the front grill is developed on the front and back surfaces.

FIG. 9 is an enlarged front view showing a part of a main partition plate of a front grill in the second embodiment.

FIG. 10 is a sectional view taken along line BB of FIG. 9 in a second embodiment.

FIG. 11 is a partial sectional view showing a main part of a main partition plate of a front grill in the second embodiment.

FIG. 12 is a cross-sectional view illustrating a main part of FIG. 11 extracted and enlarged in the second embodiment.

FIG. 13 is a partial cross-sectional view showing a state where an electroless plating is applied to a grill main body in the second embodiment.

FIG. 14 is a partial cross-sectional view showing a state where an electroplating is applied to a grill main body on which an electroless plating layer is formed in a second embodiment.

FIG. 15 is a cross-sectional view showing a main part of a resin product that has been subjected to partial plating according to a conventional technique.

FIG. 16 is a partial cross-sectional view showing a state in which electroless plating is performed on a base material in a conventional technique.

[Explanation of symbols]

3. Mark plate body as base material, 5, 31, 33
... groove, 5a, 31a ... bottom, 22 ... grill body as base material, 6, 35 ... electroless plating layer, 7, 36 ... electroplating layer, r1 ... radius of curvature, W ... width, D ... depth, D / W ...
ratio.

Continuation of the front page (56) References JP-B-45-37843 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) C23C 28/00

Claims (2)

(57) [Claims] 1. A substantially groove-shaped groove (5) having a substantially V-shaped cross section at the boundary between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (3, 22). , 31,
33) is formed so as to form a ring or a part of a ring, and after electroless plating is performed on the base material (3, 22), electroplating is performed on a portion requiring plating, whereby the base material is formed. A resin product in which a plating layer (4, 23) is formed only on a portion of the surface of (3, 22) that requires plating, wherein a bottom (5a, 31a) of the groove (5, 31, 33) is provided. ), The radius of curvature r1 of the curved section and the groove (5, 31,
The relationship between 33) and the ratio of the depth D to the width W is shown in the following 2
A partially plated resin product characterized by satisfying two formulas: ratio (D / W)> 6.7 * r1 + 1.0 ratio (D / W)> 180 * r1-15.7. 2. A substantially groove-shaped groove (5) having a substantially V-shaped cross section at a boundary between a portion requiring plating and a portion not requiring plating on the surface of the resin base material (3, 22). , 31,
Forming a groove so as to form a ring or a part of a ring; and forming the groove (5, 31, 3) on the surface of the base material (3, 22).
An electroless plating step of forming an electroless plating layer (6, 35) on a portion other than the bottom portion (5a, 31a) of 3); and an electroless plating step formed on the base material (3, 22). Of the electroless plating layer (6, 35), a portion that requires plating is electrically conducted, and an electroplating layer (7, 36) for producing a resin product in which a plating layer (4, 23) is formed only on a portion of the surface of the substrate (3, 22) that requires plating. A radius of curvature r1 of a curved section of a bottom (5a, 31a) of the groove (5, 31, 33);
The relationship between 33) and the ratio of the depth D to the width W is shown in the following 2
The ratio (D / W)> 6.7 * r1 + 1.0 The ratio (D / W)> 180 * r1-15.7 is satisfied for the partially plated resin product. Production method.