JP3809079B2 - Shaped film for pushbutton switch, cover member for pushbutton switch, and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a push button switch used in various input devices such as a mobile phone and an in-vehicle device, and more specifically, to a so-called film-based push button switch in which a plurality of key tops are covered and integrated with a single film. The present invention relates to a push button switch shaping film and a push button switch cover member using the film. Further, the present invention relates to a manufacturing method of the push button switch shaping film and the push button switch cover member.
[0002]
[Prior art]
In recent years, various designs and color tones have been required in the design of various input devices such as mobile phones and in-vehicle devices. For this reason, in a mobile phone having higher fashionability, a push button switch that is covered with a film that has been printed has been used.
[0003]
However, such a film-based pushbutton switch may cause wrinkles during film drawing depending on the material of the film, the shape and arrangement of the key tops, etc. Causes of defects such as poor appearance from the heel itself, poor adhesion to rubber or elastomer in the subsequent process due to the heel, and light leakage from the crease formed in the heel portion It was.
[0004]
Therefore, in the past, the product was made by cutting off the wrinkles, or a film having a high elongation rate was used and the drawing height (corresponding to the height of the key top) was low and the film was not stretched. It was good.
[0005]
[Problems to be solved by the invention]
However, in the method of cutting off the wrinkle portion, the flat base portion where wrinkles are generated is cut out, so that the shape and size of the base portion are limited in design.
[0006]
In addition, in the method in which the shape of the key top is low, the shape of the film or key top to be used is limited, and the design may not meet the needs of the customer.
[0007]
On the other hand, if these compromises were not adopted, defects occurred and the product did not become a product.
[0008]
Accordingly, the present invention has been conceived to solve the above-described problems, and even if the key top has a high height and requires a deep drawing process of the film, the key top portion is of course. A push button switch cover with a high yield, in which a shaping film for a push button switch that does not generate wrinkles even on a flat base portion is formed, and a key top member and a cover base material are integrated with this shaping film for a push button switch. It is an object of the present invention to provide a member and a manufacturing method of the push button switch shaping film and the push button switch cover member.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, a substantially flat rectangular base portion and a plurality of key top convex portions standing from the base portion are integrally formed, and the base portion is formed. In the push button switch shaping film that removes unnecessary portions around the base and finishes it into a product shape, among the key top convex portions, in the vicinity of the key top convex portion that is closest to the corner portion of the base portion In this case, dummy convex portions are provided on both sides of a line connecting the convex portion for the key top that hits the unnecessary portion and the corner portion of the base portion.
[0010]
According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the dummy convex portion is paired at a line-symmetrical position with respect to a line connecting the dummy convex portion and the corner portion of the base portion. In addition to the arrangement, the pair of dummy convex portions and the key top convex portions that are closest to the corner portions of the base portion are arranged so as to be substantially equidistant from each other.
[0011]
According to a third aspect of the present invention, there is provided a key top member that fills the hollow part of the convex part for the key top to the shaping film for the push button switch according to the first or second aspect, and a cover for attaching to the switch circuit board It is characterized in that the base material is bonded and integrated.
[0012]
According to a fourth aspect of the present invention, there is provided a manufacturing method comprising: a substantially flat rectangular base portion; a plurality of keytop convex portions standing from the base portion; and a dummy provided on an unnecessary portion around the base portion. The protrusion is integrally formed with a single film, and then the unnecessary portion of the integrally formed film is removed to finish the product shape.
According to a fifth aspect of the present invention, there is provided a manufacturing method comprising: a substantially flat rectangular base portion; a plurality of key top convex portions standing from the base portion; and a dummy provided on an unnecessary portion around the base portion. The hollow part of the convex part for the key top of the shaped film for a pushbutton switch, in which the convex part is integrally formed with a single film and then the unnecessary part of the integrally formed film is removed to finish the product shape The key top member is filled in and the cover member for attaching to the switch circuit board is bonded to the key top member and the base portion so as to be integrated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The push button switch shaping film, the push button switch cover member and the manufacturing method thereof according to the present invention will be described below with reference to the drawings.
[0014]
Embodiment 1 of the Invention
FIG. 1 is a cross-sectional view of a molding die used for producing a shaped film for a pushbutton switch according to the present invention. FIG. 2 is a cross-sectional view of a push button switch shaped film molded by a molding machine. FIG. 3 is a sectional view of a pushbutton switch cover member according to the present invention using the pushbutton switch shaping film of FIG.
[0015]
To manufacture a push button switch shaping film 3 comprising a keytop convex portion 1 and a substantially flat base portion 2 formed and arranged in a desired shape as shown in FIG. As described above, first, the material film 5 is set in the concave mold 4 formed in the shape of the desired pushbutton switch shaping film 3.
[0016]
And the convex part side mold | die 6 corresponding to the recessed part side metal mold | die 4 is addressed from the top of the raw material film 5, and the raw material film 5 is shape | molded using the same recessed part side metal mold | die 4 and the convex part side metal mold | die 6. The push button switch shaping film 3 having the final shape is formed by performing the work.
[0017]
When the push button switch shaping film 3 is completed, unnecessary portions are removed, and the key top member 7 is filled in the hollow portion 14 of the key top convex portion 1 and attached to the switch circuit board as shown in FIG. The cover base material 8 is fixed directly or via an adhesive to complete the push button switch cover member 9 in which these are integrated. Here, the key top member 7 is formed by bonding a molded product separately molded into the shape of the hollow portion 14 of the key top convex portion 1 or by injection molding a resin into the hollow portion 14 of the key top convex portion 1. Alternatively, the hollow portion 14 of the key top convex portion 1 may be integrated with the push button switch shaping film 3 by, for example, filling and curing a photocurable resin.
[0018]
Further, if necessary, the push button switch cover member 9 may be bonded and fixed to the back surface of the cover base material 8 that contacts the key top member 7 with a metal disc spring 10 that generates a click feeling during operation. .
[0019]
In the above steps, when the height of the key top convex portion 1 is relatively high, a deep drawing process of the film is required in forming the key top convex portion 1 in the molding process of the push button switch shaping film 3. As a result, a location where non-uniform tensile stress occurs during molding occurs from the positional relationship between the adjacent key top convex portions 1, 1, 1,..., And as a result, wrinkles occur in the base portion 2.
[0020]
Therefore, the flaw occurrence preventing means employed in the present invention will be described below.
[0021]
FIG. 4 is a plan view corresponding to Embodiment 1 of the push button switch shaping film according to the present invention. FIG. 4 (a) shows a case where no wrinkle prevention means is provided, and FIG. ) Shows the case where wrinkle generation prevention measures are taken.
[0022]
FIG. 4A shows an example of a push button switch shaping film used in a mobile phone or the like, and since no wrinkle prevention means has been taken in advance, it is compared with the push button switch shaping film 3. 1 key part, 3 key part, # key corresponding to the corners of 12 key top convex parts 1 of the ten key part (0-9 key part), * key part, and # key part that are formed densely , * Key portion and a ridge 12 is generated on a line K connecting the corner portion 11 of the push button switch shaping film 3.
[0023]
Therefore, in the present invention, as shown in FIG. 4 (b), the 1-key portion, the 3-key portion, which hits the key-top convex portion 1 closest to the corner portion 11 of the push button switch shaping film 3, A dummy convex portion 13 that is approximately the same size as the key top convex portion 1 at a position that is symmetrical with respect to the line K connecting the key portion, * key portion, and the corner portion 11 of the push button switch shaping film 3, One (a total of eight) is provided across the line K. And the dummy convex part 13 is arrange | positioned in the unnecessary part H of the shaping film 3 for pushbutton switches, and the convex for keytops nearest to the corner | angular part 11 of the shaping film 3 for pushbutton switches which is the cause of wrinkles The part 1 (1 key part, 3 key part, # key part, * key part) and the pair of dummy convex parts 13 and 13 provided in the vicinity thereof are arranged so as to be substantially equidistant from each other. As a result, the tensile stress generated by concentration at a specific portion of the base portion 2 during molding without the dummy convex portion 13 is almost canceled by the presence of the dummy convex portion 13, and as a result, the product region P No wrinkles occur in the inner base portion 2.
[0024]
Here, considering the mechanism of wrinkle generation, the factors of wrinkle generation in the drawing process of the film are that the film itself is difficult to stretch and the stress generated in the base portion 2 around the key top convex portion 1 is reduced. Uniformity is improved.
[0025]
Among these, the difficulty of elongation of the film itself can be said to be less likely to cause wrinkles as the elongation rate of the film is higher under the same load condition. For example, the generation amount of wrinkles in a polyethylene terephthalate (PET) film> the generation amount of wrinkles in a polycarbonate (PC) film> alloy film (hereinafter referred to as PC / PBT) composed of polycarbonate (PC) and polybutylene terephthalate (PBT) )). For this reason, when deep drawing is necessary, it is naturally appropriate to use a PC / PBT film having a high elongation rate.
[0026]
In addition, regarding the non-uniformity of the generated stress, the generation of wrinkles is observed when the film is pulled in multiple radial directions with a uniform force when the direction in which the tensile stress acts at a specific location is viewed from the plane. However, there is a tendency that wrinkles are more likely to occur as the number of radial pulls decreases. For example, when a uniform pulling force (force parallel to the film plane) is applied to a specific part of the film, when the pulling force is applied in four directions, ie, up, down, left, and right crosses as viewed from the plane, Amount of generation <Amount of wrinkles when a pulling force acts in three directions on either the right or left and top or bottom T-shapes perpendicular to each other <A case where a pulling force acts in two directions on the same vertical I-shape The amount of wrinkles generated is related to each other, and wrinkles are generated at locations where no tensile force acts.
[0027]
Therefore, when a tensile force acts on a specific portion of the film, it can be said that it is desirable to apply the tensile force in as many radial directions as possible with a uniform force. It has been confirmed that when a pulling force acts in four directions on an up, down, left, and right cross, the wrinkles that cause a practical problem do not occur unless the magnitude of the pulling force itself is extremely uneven. .
[0028]
For example, in the first embodiment, which is composed of twelve key top convex portions 1 of a ten key portion (0 to 9 key portion), a * key portion, and a # key portion which are formed relatively densely, 5 Since the key part and the 8 key part have adjacent key parts in eight directions, no wrinkles occur in the periphery even if the film has a small elongation rate such as PET. The 2 key part, 6 key part, 9 key part, 0 key part, 7 key part, and 4 key part are adjacent to each other in 3 directions. No wrinkles occur around the area. On the other hand, the 1 key part, 3 key part, # key part, and * key part corresponding to the corners of the relatively dense key part have only two directions of the adjacent key parts, so that the expansion rate is similar to that of PC / PBT. Even if the film has a large thickness, wrinkles 12 occur in the base portion 2 around the film.
[0029]
FIG. 5 is performed to determine the position where the dummy convex portion 13 is arranged in order to prevent wrinkles that occur when the wrinkle generation preventing means is not provided in the push button switch shaping film 3 of the first embodiment. An experimental example is shown.
[0030]
FIG. 5 (a) shows that the # key part that hits the key top convex part 1 closest to the corner part 11 of the push button switch shaping film 3 and the push button switch shaping film 3 according to the conditions employed in the first embodiment. Dummy protrusions 13 that are approximately the same size as the keytop protrusions 1 at positions that are symmetric with respect to the line K connecting the corners 11, and one by one with the line K in between the portions that hit the unnecessary part H ( 2 in total). Thereby, the balance of the tensile stress generated in the base portion 2 around the #key portion during molding is balanced, and no wrinkles are generated in the base portion 2 around the #key portion. However, another crease 12 is generated between the dummy convex portion 13 and the corner portion 11 of the push button switch shaping film 3 because of a non-uniform tensile stress. Since this other scissors 12 occur in the unnecessary portion H of the push button switch shaping film 3, there is no problem because it is removed in a subsequent process.
[0031]
On the other hand, FIG. 5B shows a case where the distance between the pair of dummy convex portions 13 and 13 is made smaller than the condition of the wrinkle generation preventing means of the first embodiment. In this case, the dummy convex portion By providing 13, the ridge 12 is generated on the line connecting the # key part and the dummy convex part 13. Since this ridge 12 is formed inside the product region P, in this case, the push button switch shaping film 3 is a defective product.
[0032]
FIG. 5C shows a case where the distance between the pair of dummy convex portions 13 and 13 is larger than the condition of the wrinkle generation preventing means of the first embodiment. In this case, the effect of the dummy convex portion 13 is shown. Therefore, the ridge 12 on the line connecting the # key part and the corner part 11 of the push button switch shaping film 3 does not disappear completely. Accordingly, since the bag 12 is inside the product region P, in this case, the push button switch shaping film 3 is a defective product.
[0033]
In other words, the line K connecting the key top convex portion 1 closest to the corner portion 11 of the push button switch shaping film 3 and the corner portion 11 of the push button switch shaping film 3 that causes wrinkles is used as a reference. As shown in FIG. 1, dummy projections 13 that are approximately the same size as the keytop projections 1 are provided on both sides of the line K, and the dummy projections 13 are unnecessary portions of the push button switch shaping film 3. The key top convex portion 1 closest to the corner portion 11 of the push button switch shaping film 3 and the pair of dummy convex portions 13 and 13 provided in the vicinity thereof are arranged at substantially equal intervals. It was confirmed that the non-uniformity of the tensile stress generated in the base portion 2 at the time of molding was eliminated, and as a result, no wrinkles were generated in the product region P.
[0034]
In the case of the first embodiment, the imaginary line S in FIG. 4B is shown in view of making the condition of the adjacent keys the same for all the key top convex portions 1 (12). The dummy convex portions 13 are also provided at a plurality of locations, but these are not necessarily required. Whether or not it is necessary is determined in consideration of the tensile stress generated at the location and the elongation rate of the film.
[0035]
[Embodiment 2 of the Invention]
FIG. 6 is a plan view corresponding to Embodiment 2 of the shaped film for a pushbutton switch according to the present invention, and FIG. 6 (a) shows a case where no wrinkle prevention means is taken, and FIG. ) Shows the case where wrinkle generation prevention measures are taken.
[0036]
FIG. 6 (a) shows an example of a push button switch shaping film composed of two keys having a large interval between adjacent keys, and since no wrinkle generation prevention means is taken in advance, the push button switch On the straight line connecting the two key top convex portions 1 of the A key portion and the B key portion formed on the shaping film 3 and the key top convex portion 1 of the A key portion and B key portion and the push button switch Wrinkles 12 are generated on a line K connecting the corners 11 of the shape film 3.
[0037]
Therefore, in the present invention, as shown in FIG. 6 (b), the A key portion and the B key portion of the key top convex portion 1 of the push button switch shaping film 3 and the push button switch shaping film 3 are provided. A dummy convex portion 13 having a size substantially equal to that of the key top convex portion 1 is provided one by one across the line K (a total of eight) at a position that is symmetric with respect to the line K connecting the corner portion 11 of the key top. Yes. As a result, the tensile stress generated in the base portion 2 during molding without the dummy convex portion 13 is relieved by canceling out due to the presence of the dummy convex portion 13, and as a result, no wrinkles occur in the base portion 2.
[0038]
In the case of the second embodiment, in order to prevent the occurrence of wrinkles 12 that have occurred on the line connecting the A key part and the B key part, a dummy line is also provided at the location indicated by the imaginary line S in FIG. Although it is conceivable to provide the convex portion 13, it has been confirmed by the inventor that the wrinkles 12 at the corresponding portion are not generated by only the eight described above, and this is not necessarily required. Whether or not it is necessary is determined in consideration of the tensile stress generated at the location and the elongation rate of the film.
[0039]
In the first and second embodiments, the dummy convex portion 13 is substantially equal to the size of the original key top convex portion 1, but is not limited thereto. Since the dummy convex portion 13 can be easily manufactured if it is equal to the size of the original key top convex portion 1, it can be said that this is desirable from the viewpoint of cost reduction. However, the function of the dummy convex portion 13 is to prevent the tensile stress from concentrating on a specific portion of the base portion 2 of the push button switch shaping film 3, and one form of the dummy convex portion 13 for that purpose is specified. It does not have to be a value.
[0040]
For example, when a uniform tensile force acts in four directions orthogonal to a specific portion of the film, it is 2.0 times or more for a PC / PBT film, 1.4 times or more for a PC film, and 1 for a PET film. The inventor has confirmed that wrinkles are generated in the film when there is a difference in the pulling force in two directions perpendicular to each other more than twice. Therefore, if different tensile stresses exceeding these values do not act, wrinkles will not occur in the vicinity of the specific portion, and the size of the dummy convex portion 13 is originally set as long as it is within the range. It can be said that it may be different from the size of the key top projection 1.
[0041]
Specifically, when the cross section of the original keytop convex portion 1 is oval, the cross section of the dummy convex portion 13 cannot be made oval because of the surrounding space. It is conceivable that the circle is circular and has the same height as the original key top convex portion 1.
[0042]
The push button switch shaping film 3 is used to manufacture the push button switch cover member 9 in subsequent steps such as a filling process of the key top member 7, an unnecessary portion H removing process, and an adhesion process with the cover base material 8. However, it is also conceivable to use the dummy convex portion 13 as a positioning portion in these subsequent processes. In this case, considering that the cross section of the counterpart positioning pin is generally circular, it can be said that the circular cross section of the dummy convex portion 13 is convenient.
[0043]
【Example】
Examples of the present invention will be described below.
[0044]
[Example 1]
In Example 1, the manufacturing method of Embodiment 1 of the pushbutton switch cover member according to the present invention was tried.
[0045]
First, a desired printing is performed by screen printing on a PC / PBT film (by hole, manufactured by Bayer) having a thickness of 125 μm using a by-hole ink (HTR, manufactured by Norifan), and then at 100 ° C. for 5 minutes. Drying was performed.
[0046]
Next, the printed PC / PBT film is inserted into a molding die composed of a convex side mold and a concave side die having a predetermined product shape, and drawn at a mold temperature of 120 ° C. for 10 seconds. went. At this time, the print processing surface of the PC / PBT film is set so as to cover the convex part of the convex part side mold.
[0047]
The shape and arrangement of the dummy protrusions 13 are the same conditions as in the first embodiment.
[0048]
Specifically, as shown in FIG. 4, twelve key top convex portions 1 are arranged with a vertical pitch of 8 mm and a horizontal pitch of 14 mm. When viewed from above, it has an oval shape, and its major axis is 8 mm and minor axis is 6 mm. Each keytop convex portion 1 has a height of 2.5 mm. On the other hand, the shape and height of each dummy protrusion 13 viewed from the plane is the same as each keytop protrusion 1, and one key part corresponding to the corner of each of the 12 keytop protrusions 1, Two dummy convex portions 13 are arranged in the vicinity of each of the 3 key portion, the # key portion, and the * key portion. The distance (the distance from the center to the center) between the two dummy convex portions 13 and the 1 key portion, 3 key portion, # key portion, and * key portion was 17 mm.
[0049]
The push button switch shaping film 3 according to Example 1 molded under the above conditions shows no wrinkles on the base portion 2 as well as the key top convex portion 1, and the cover base material 8 in the subsequent process. The push button switch cover member 9 using the push button switch shaping film 3 has no light leakage and has a good appearance.
[0050]
[Example 2]
In Example 2, the manufacturing method of Embodiment 2 of the cover member for a push button switch according to the present invention was tried.
[0051]
First, a desired film is printed on a PET film (HIPET 9300, manufactured by Tojo Chemical Co., Ltd.) on a PET film having a thickness of 75 μm (Lumirror, manufactured by Toray Industries, Inc.), then 100 ° C., 30 Minutes of drying.
[0052]
Next, the printed PC / PBT film is inserted into a molding die comprising a convex mold and a concave mold having a predetermined product shape, and drawing is performed at a mold temperature of 120 ° C. for 10 seconds. It was. At this time, the print processing surface of the PC / PBT film is set so as to cover the convex part of the convex part side mold.
[0053]
The shape and arrangement of the dummy protrusions 13 are the same conditions as in the second embodiment.
[0054]
Specifically, as shown in FIG. 6, the two key top convex portions 1 are arranged at an interval of 30 mm (distance from the center to the center) in the vertical direction. Is circular when viewed from above, and has a diameter of 4 mm and a height of 4.5 mm. On the other hand, the shape and height of each dummy protrusion 13 viewed from the plane is the same as each keytop protrusion 1, and there are two keytop protrusions 1 near each other. The dummy protrusions 13 are arranged. And the space | interval (distance from a center to a center) of these two dummy convex parts 13 and each convex part 1 for keytops was 14-15 mm.
[0055]
The push button switch shaping film 3 according to Example 2 molded under the above conditions shows no wrinkles in the base portion 2 as well as the key top convex portion 1, and the cover base material 8 in the subsequent process. The push button switch cover member 9 using the push button switch shaping film 3 has no light leakage and has a good appearance.
[0056]
【The invention's effect】
As described above, according to the invention described in claim 1, the substantially flat rectangular base portion and the plurality of key top convex portions standing from the base portion are integrally formed, In the push button switch shaping film that removes unnecessary parts around the base part and finishes it into a product shape, among the key top convex parts, in the vicinity of the key top convex part that is closest to the corner part of the base part Because there are dummy protrusions on both sides of the line connecting the key top protrusion that hits the unnecessary part and the corner of the base, for the key top that is closest to the corner of the base by the dummy protrusion Since the non-uniformity of the tensile stress acting near the base of the convex part is alleviated, it is possible to obtain a shaped film for a pushbutton switch with a high yield that does not cause wrinkles in the flat base part as well as the key top part. It is done.
[0057]
According to the invention described in claim 2, the dummy convex portions are arranged in a pair of symmetrical positions with respect to a line connecting the dummy convex portion and the corner portion of the base portion, and the pair of dummy convex portions. In addition to the effects of the first aspect, the design condition of the dummy convex portion is determined because the key top convex portion closest to the corner portion of the base portion and the convex portion for the key top are arranged at almost equal intervals. Therefore, it is possible to obtain a shaped film for a pushbutton switch having a high yield in which wrinkles do not occur in the flat base portion as well as the key top portion without taking time for trial molding.
[0058]
According to the third aspect of the present invention, the push button switch shaped film according to the first or second aspect is attached to the key top member filling the hollow portion of the key top convex portion and the switch circuit board. Since the cover base material is bonded and integrated, it is possible to obtain a key top member for a pushbutton switch with a high yield that does not cause wrinkles even in a flat base portion as well as a key top portion.
[0059]
According to the manufacturing method of the present invention, the substantially flat rectangular base portion, the plurality of key top convex portions standing from the base portion, and unnecessary portions around the base portion are provided. Since the dummy projection provided is integrally formed with a single film, and the product shape is finished by removing the unnecessary portion of the integrally formed film, the corner of the base portion is formed by the dummy projection. Since the non-uniformity of the tensile stress acting near the base part of the key top convex part closest to the part is alleviated, the yield does not cause wrinkles even in the flat base part as well as the key top part. A push button switch shaped film having a high height can be obtained.
[0060]
According to the manufacturing method of the present invention, the substantially flat rectangular base portion, the plurality of key top convex portions standing from the base portion, and unnecessary portions around the base portion are provided. The hollow part of the key top convex part of the shaped film for a pushbutton switch in which the dummy convex part is integrally formed with a single film, and then the unnecessary part of the integrally molded film is removed to finish the product shape The key top member is filled in, and the key top member and the base part are bonded and integrated with the cover base material for mounting to the switch circuit board, so that the dummy convex part is closest to the corner part of the base part. Because the non-uniformity of the tensile stress acting near the base of the key top convex part is alleviated, the cover for a push button switch with a high yield that does not generate wrinkles in the key top part as well as the flat base part Member is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a molding die used for producing a shaping film for a pushbutton switch according to the present invention.
FIG. 2 is a cross-sectional view of a shaped film for a push button switch according to the present invention molded by a molding machine.
3 is a cross-sectional view of a push button switch cover member according to the present invention using the push button switch shaping film of FIG. 2; FIG.
FIG. 4 is a plan view corresponding to Embodiment 1 of a push button switch shaping film according to the present invention, in which FIG. 4 (a) shows a case where no wrinkle prevention means is taken, and FIG. ) Indicates the case where wrinkle prevention measures are taken.
5 is a partially enlarged plan view of a shaped film for a pushbutton switch corresponding to Embodiment 1 of the present invention, showing an example of an experiment conducted to determine wrinkle generation preventing means, FIG. 5 (a) Shows the case where the distance between the dummy protrusions is the same as in the first embodiment, FIG. 5B shows the case where the distance between the dummy protrusions is made smaller, and FIG. The case where the space | interval of parts is made larger than it is shown.
6 is a plan view corresponding to Embodiment 2 of a push button switch shaping film according to the present invention, and FIG. 6 (a) shows a case where no wrinkle prevention means is taken; FIG. ) Indicates the case where wrinkle prevention measures are taken.
[Explanation of symbols]
1 Convex for key top
2 Base part
3 Shaping film for pushbutton switches
5 Material film
7 Key top part
8 Cover material
9 Pushbutton switch cover member
11 corner
12 皺
13 Dummy convex part
H Unnecessary part

Claims (5)

For pushbutton switches that have a substantially flat rectangular base part and a plurality of key top convex parts standing from the base part, and remove unnecessary portions around the base part to finish the product shape. In the shaping film, among the key top convex portions, the key top convex portions and the base that are in the vicinity of the key top convex portions that are closest to the corners of the base portion and hit the unnecessary portions A shaped film for a pushbutton switch, characterized in that dummy convex portions are provided on both sides of a line connecting the corner portion of the portion. A pair of the dummy protrusions are arranged at symmetrical positions with respect to a line connecting the dummy protrusions and the corners of the base part, and are closest to the corners of the pair of dummy protrusions and the base part. The shaped film for a pushbutton switch according to claim 1, wherein the keytop convex portions are arranged so as to be substantially equidistant from each other. The key top member that fills the hollow portion of the convex part for the key top and the cover base material that is attached to the switch circuit board are bonded and integrated with the shaping film for the pushbutton switch according to claim 1 or 2. A cover member for a push button switch. A substantially flat rectangular base portion, a plurality of key top convex portions erected from the base portion, and dummy convex portions provided on unnecessary portions around the base portion are integrally formed with a single film. A method for producing a shaped film for a pushbutton switch, wherein the product shape is finished by removing the unnecessary portion of the integrally formed film. A substantially flat rectangular base portion, a plurality of key top convex portions erected from the base portion, and dummy convex portions provided on unnecessary portions around the base portion are integrally formed with a single film. Then, the key top member is filled in the hollow part of the convex part for the key top of the shaped film for the push button switch, which is formed into a product shape by removing the unnecessary part of the integrally formed film, and the key top member And a cover member for attaching to a switch circuit board, and a base material for bonding to the base part by bonding together to form a cover member for a pushbutton switch.

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