KR101347426B1 - Key-top structure, electronic device, and method of manufacturing key-top structure - Google Patents

Abstract

Provided are a method for producing a key top structure, an electronic device, and a key top structure which can suppress deformation of the key top member when the key top member is pressed or when an ultraviolet curable resin is cured to produce a key top member. In the key top structure 60, the sheet-shaped portion 61b and the plurality of key tops 61a are formed by curing the ultraviolet curable resin, and the key top 61a has a larger thickness T than the sheet-shaped portion 61b. And a key top member 61 having a portion in which a plurality of key tops 61 a are arranged in a row with a predetermined interval, and an ultraviolet curable resin with respect to the substrate to form a key top member 61. In this case, the strain suppressing means for suppressing deformation due to shrinkage after curing of the key top member 61 is provided.

Description

KEY-TOP STRUCTURE, ELECTRONIC DEVICE, AND METHOD OF MANUFACTURING KEY-TOP STRUCTURE}

The present invention relates to a key-top structure, an electronic device and a manufacturing method of the key-top structure.

The key top structure used in electronic devices such as mobile phones is generally coated with ink on resin molded articles and / or decorated with text printing, and then forms a series of key top structures. Many techniques are used for adhering and arranging on a film made of polyethylene terephthalate (PET) or silicone rubber, which is a flexible base material. In addition, in recent years, in order to meet the demand of thinning mainly on mobile terminals such as mobile phones, ultraviolet curable resins are molded on film-like substrates and printed and / or printed on the back of film-based substrates. Decorated key top structure is used.

As a technique for manufacturing such a key top structure, there exists a thing disclosed by patent document 1. As shown in FIG.

Japanese Patent Publication No. 2009-135083

By the way, the key top part is formed in the surface side (the ceiling side) of a base material by the method disclosed by the above-mentioned patent document 1, and the colored layer is formed in the back side of a base material, and the key top of a pushbutton switch member When used as a structure, there are the following problems.

First, since the base material is made of polyethylene terephthalate (PET) or the like formed by biaxial stretching, the substrate is not excellent in elasticity. Therefore, the click feeling is not excellent when the user presses the key top structure (first problem).

Moreover, when forming a key top structure by the method disclosed by patent document 1 in the surface of a base material, a key top structure is made so that surface side (top surface side) may become concave by shrinkage at the time of hardening ultraviolet curable resin and manufacturing a key top member. Is deformed (the key top structure is bent; second problem). Here, in order to suppress such deformation, it is conceivable to employ a method of increasing the thickness dimension of the substrate. However, even when the thickness dimension of a base material is increased, there exists a part which cannot be fixed with a fixing tape generally at the edge part of a base material by the offset of the fixing tape (double-sided tape). Therefore, a local deformation | transformation (local deformation | transformation) generate | occur | produces in the edge part of such a base material, and even the touch by a local deformation | transformation, for example, touches at the time of a key operation, can feel a jam. Here, when unexpected peeling force is applied to the edge part which a feeling of jam occurs, there exists a possibility that an ultraviolet curable resin may peel from a base material.

Moreover, when thickening a base material, even if it presses a key top part, a base material becomes hard to deform | transform and becomes unsuitable as a key top structure.

This invention is made | formed based on the said situation, The objective is to solve at least one of a 1st subject and a 2nd subject, and when it presses a keytop structure, it is excellent in a click feeling or an ultraviolet curing type It is an object of the present invention to provide a method for producing a key top structure, an electronic device, and a key top structure that can suppress deformation of the key top member when the resin is cured to produce the key top member.

In order to solve the said subject, in the 1st side surface of the key top structure of this invention, a sheet-shaped part and several key tops are formed by hardening an ultraviolet curable resin, and a key top has a thickness dimension larger than a sheet-shaped part, Furthermore, when the key top member has a portion where the plurality of key tops are arranged in a row with a predetermined interval, and the ultraviolet curable resin is formed on the substrate to form the key top member, deformation due to shrinkage after curing of the key top member In addition to suppressing the above, after the shrinkage after hardening of the key top member falls within a predetermined range, the substrate is provided with deformation suppression means configured by peeling the substrate from the key top member.

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In such a configuration, the ultraviolet curable resin shrinks upon curing, but it is possible to suppress deformation due to shrinkage after curing of the key top member due to the presence of the strain suppressing means. Therefore, it becomes possible to suppress the deformation so that the surface side (ceiling side) of the key top structure becomes concave.

Moreover, since the deformation | transform suppression means is comprised by peeling a base material from a key top member after shrinkage after hardening falls in a predetermined range, the base material which is not excellent in elasticity will not be adhere | attached to a key top member. Therefore, when the user presses the keytop structure, the state in which the click feeling is not excellent can be eliminated.

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According to another aspect of the key top structure of the present invention, in the above-described invention, the thickness dimension of the sheet-shaped portion is in the range of 0.03 mm to 0.15 mm, and the predetermined interval between the plurality of key tops is 0.2 mm to 1.0 mm. It is preferable.

In such a configuration, the deformation due to shrinkage after curing of the key top member can be suppressed more favorably, and the user can press the key top structure to have an excellent feeling of click.

Another aspect of the key top structure of the present invention is that the sheet-shaped portion and the plurality of key tops are formed by curing the ultraviolet curable resin, and the key top has a thickness larger than that of the sheet-shaped portion, and the plurality of key tops are predetermined. The key top member which has a part arrange | positioned in strip shape in the state which has a space | interval is provided, The thickness dimension of a sheet-shaped part exists in the range of 0.03 mm-0.15 mm, and the predetermined space | interval between a plurality of key tops is 0.2 mm-1.0 It is preferable to exist in the range of mm.

In such a configuration, the deformation due to shrinkage after curing of the key top member can be suppressed more favorably, and the user can press the key top structure to have an excellent feeling of click.

Moreover, in another aspect of the key top structure of this invention, in the above-mentioned invention, it is preferable that the key top member is provided in the range of Shore-D hardness of 40 degree | times-80 degree | times.

In such a configuration, the deformation due to shrinkage after curing of the key top member can be suppressed more favorably, and the user can press the key top structure to have an excellent feeling of click.

According to another aspect of the key top structure of the present invention, in the above-described invention, when the key top member presses any key top from its celestial side, only the object to be pressed of the pressed key top is pressed, and other key tops other than the pressed key top are pressed. It is preferable to provide a deformation | transmission allowance means for making it press independently so that a press object may not be pressed.

In such a configuration, since the deformation allowance means is provided, only the pressing object corresponding to the pressed keytop can be reliably pressed. Therefore, when a key top structure is used for an electronic device, it becomes possible to prevent the malfunction at the time of pressing.

In addition, the electronic device of the present invention includes each of the above-described key top structures, and has an installation site for installing the key top member, and the installation site is directly or indirectly contacted with the key top member to suppress deformation. It is preferred to be part of the components of the means.

In such a configuration, the installation site can directly and indirectly contact the keytop member, whereby the deformation due to shrinkage after curing of the keytop member can be further suppressed. Therefore, it becomes possible to suppress the deformation | transformation so that the surface side (ceiling | side surface side) of a key top structure may become concave more favorably.

Moreover, the manufacturing method of the key top structure which is another aspect of this invention covers the injection process which inject | pours liquid ultraviolet curable resin into the recessed part of a shaping | molding die, and the ultraviolet curable resin injected into the recessed part, and adheres to ultraviolet curable resin further, An installation step of placing the base material in a state to be formed, a curing step of irradiating ultraviolet light to the liquid ultraviolet curable resin to cure the ultraviolet curable resin to produce a keytop member, and removing the integral material of the base material and the keytop member from the molding die, It is preferable to have a peeling process which peels off a base material from the integral body of a base material and a keytop member after a peeling-off process and the shrinkage | contraction after hardening of the said keytop member fall in a predetermined range.

In such a configuration, the ultraviolet curable resin shrinks upon curing thereof, but it is possible to suppress deformation caused by shrinkage after curing of the key top member due to the presence of the peeling step. Therefore, it becomes possible to suppress the deformation so that the surface side (ceiling side) of the key top structure becomes concave.

According to the present invention, when the key top structure is pressed, an excellent feeling of click can be obtained. Or when hardening an ultraviolet curable resin and manufacturing a key top member, the deformation of the said key top member can be suppressed.

1 is a perspective view showing the configuration of a portable terminal according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the configuration of the key arranging portion and the key top structure, and showing a part along the line AA of FIG. 1.
3 is a flowchart for explaining a method for manufacturing a keytop structure.
It is a schematic diagram for demonstrating the manufacturing method of a key top structure using a shaping | molding die.
FIG. 5: is a top view which shows the state which enlarged the dimension of the short direction along the edge part of a long direction rather than the dimension of the short direction along the center of a long direction in the uncured key top member.
FIG. 6: is a top view which shows the state which enlarged the dimension of the longitudinal direction along the edge part of a short direction rather than the dimension of the longitudinal direction along the center of a short direction in addition to the state of FIG. 5 in the uncured key top member.
FIG. 7: is a figure which shows the cure shrinkage of a key top, (A) has shown the state before hardening to the prescribed dimension, and (B) has shown the state after hardening to the specified dimension.
Fig. 8 is a diagram showing the relationship between the distance between adjacent key tops and the load required when the key top is pressed.
Fig. 9 is a side view showing a state where local deformation occurs in the key top structure, (A) shows the overall configuration, and (B) shows an enlarged view of the A portion.
It is sectional drawing which shows the state in which a base material is not peeled from a key top member.
11 is a cross-sectional view showing a state in which the base material is curved so that the top surface side of the key top structure is bent in a convex manner according to a modification of the present embodiment.
12 is a perspective view showing the configuration of a mobile telephone apparatus according to a modification of the present invention.

Hereinafter, the keytop structure 60 which concerns on one Embodiment of this invention, and the electronic device using this keytop structure 60 are demonstrated based on each figure. In addition, in this embodiment, although the portable terminal 10 which can be used as a portable telephone apparatus, a mail terminal, etc. as an example of an electronic apparatus is illustrated and demonstrated, an electronic apparatus is not limited to the portable terminal 10, Any thing may be used as long as it has the key top structure 60.

<Overall Configuration of Mobile Phone Device>

As shown in FIG. 1, the mobile terminal 10 according to the present embodiment includes a case portion 20, a display portion 30, a cursor key portion 40, and a key arrangement portion 50. Equipped. In addition, in the following description including FIG. 1, the long direction of the portable terminal 10 is demonstrated in the X direction, the short direction of the portable terminal 10 is Y direction, and the thickness direction of the portable terminal 10 is Z direction. do.

The case part 20 covers an internal configuration of the mobile terminal 10 and protects the internal configuration from external impact, dust, dust and the like. An opening part or a recess part is provided in this case part 20 suitably, and the display part 30 is provided in one of these opening parts or recess parts. The display unit 30 includes, for example, an organic electroluminescence (EL) display, a liquid crystal display, and the like, and an image is represented as a collection of pixels of a predetermined gray scale of RGB based on a display driver of a controller (not shown).

1, the cursor key part 40 has the annular button part 41 and the center button part 42, and these cursor key part 40 and the annular button part 41 are the case part 20. As shown in FIG. The top surface side of the key top 61a (refer FIG. 2) protrudes from the opening of the top. Among these, the annular button part 41 has the site | part which presses by 90 degree space | intervals, for example. In addition, the center button part 42 is a part in which the pressed part (the top surface side of the key top 61a) is surrounded by the annular button part 41.

In addition, in FIG. 1, the four key parts provided in parallel with the cursor key part 40 along the X direction may be contained in the cursor key part 40, and are contained in the key arrangement part 50. In addition, in FIG. You may use it.

Similarly to the cursor key portion 40, the key arrangement portion 50 protrudes from the opening of the case portion 20 in the top surface side of the key top 61a. As shown in FIG. 1, this key arrangement | sequence part 50 arrange | positions three key tops 61a of the same shape side by side in the Y direction, for example, and the total of the said key tops 61a is 32 pieces. The number of the key tops 61a is not limited to 32, but may be provided in number. Typical examples of the number of the key tops 61a include, for example, between 15 and 19, and between 30 and 50.

In the key arranging unit 50 shown in FIG. 1, since the rows of the keytop 61 on the left side and the inner side when the user inputs are in the order of QWERTY, they are called QWERTY keyboard arrangements. Such a key arrangement is employed in the case where the portable terminal 10 as shown in Fig. 1 is arranged with a keytop 61 of 30 or more. The key arranging unit 50 may be arranged not only in the arrangement of orthogonal lattice shapes (tilts) as shown in FIG. 1 but also in an arrangement in which the key tops 61 are arranged in a zigzag shape.

The key top structure 60 of this embodiment as shown in FIG. 2 is embodied in the above-described key arrangement | sequence part 50. As shown in FIG. However, the keytop structure 60 may be configured to embody the cursor key portion 40, or may employ a structure embodying the keytop structure 60 on both the key arrangement portion 50 and the cursor key portion 40. . In addition, an installation site for installing the key top structure 60 in the mobile terminal 10 is present in the case 20. This installation site | part can also become a part of the component of the deformation | transform suppression means mentioned later by directly contacting or indirectly contacting the key top member 61 mentioned later.

The cursor key portion 40 and the key arrangement portion 50 electrically contact the fixed contact 72 to be described later with the disc spring member 73 by pressing the top surface of the key top 61a with a finger or the like. It is possible to let. The controller, not shown, can execute a predetermined function corresponding to the pressing.

<About the details of key top structure>

Next, the detail of the key top structure 60 is demonstrated. In addition, in the following description, the key top structure implemented by the key arrangement | sequence part 50 as an example of the key top structure 60 is demonstrated including the detail of the structure of the said key arrangement | positioning part 50. As shown in FIG. In addition, since the structure of the cursor key part 40 is the same as that of the key arrangement part 50, the description is abbreviate | omitted.

The key arrangement section 50 has a key top member 61, a colored layer 62, a presser 70, and a substrate 71.

Among them, the key top member 61 constitutes the key top structure 60 together with the colored layer 62. The key top member 61 is formed by hardening an ultraviolet curable resin by ultraviolet irradiation so that it may mention later. Here, as liquid ultraviolet curable resin, what added the photoinitiator etc. to the main body containing a photopolymerization prepolymer and a monomer can be used. Moreover, as ultraviolet curable resin, you may mix | blend a filler, antioxidant, reaction promoter, reaction inhibitor, stabilizer, coloring agent, etc. as needed in addition to the above. Examples of the UV-curable resin include monomers and / or oligomers such as acrylic, methacrylic, styrene, unsaturated polyester, polyester polyol, polyester ether, urethane, silicone, epoxy or phenol, derivatives thereof. Monomers and / or oligomers or mixtures of two or more thereof can be used.

In addition, as the ultraviolet curable resin, it is preferable that the shrinkage of the curing is small, transparent, and excellent in heat resistance, environmental resistance, colorability, and moldability. Specifically, acrylic, methacrylic, allyl, urethane, unsaturated polyester, and silicone It is preferable to use materials, or derivatives or mixtures thereof.

Here, when hardening an ultraviolet curable resin and forming a resin hardened | cured material, the thickness dimension of the said resin hardened | cured material becomes more suitable when it is smaller than 0.3 mm or less than 0.3 mm. On the other hand, when forming the resin hardened | cured material of resin called polycarbonate by injection molding, the thickness dimension of the said resin hardened | cured material becomes more suitable when 0.5 mm or more or larger than 0.5 mm. When the thickness of the cured resin is greater than 0.3 mm or greater than 0.3 mm and less than 0.5 mm or less than 0.5 mm, the cured resin may be formed by curing the ultraviolet curable resin, and the cured resin may be formed by injection molding. You may form.

Moreover, it is preferable that the shore-D hardness of the key top member 61 formed by hardening an ultraviolet curable resin exists in the range of 40 degree | times-80 degree | times.

This key top member 61 has a key top 61a and the sheet-like part 61b. The key top 61a is a part provided thicker than the other part of the key top member 61 (sheet-shaped part 61b in FIG. 2).

Moreover, it is preferable that the thickness dimension S of the sheet-like part 61b exists in the range of 0.03 mm-0.15 mm. When the thickness dimension is smaller than 0.03 mm, the sheet-like portion 61b is more likely to be damaged, and when the thickness dimension S is larger than 0.15 mm, the flexibility of deformation of the sheet-like portion 61b is impaired. to be. Moreover, it is still more preferable if it exists in the range of 0.03 mm-0.10 mm also in the said range, and it is still more preferable if it exists in the range of 0.03 mm-0.05 mm.

Moreover, it is preferable that the space | interval L of key top 61a comrades exists in the range of 0.2 mm-1.0 mm. In particular, by setting the spacing L to a value within this range, a large number of the key tops 61 can be arranged while increasing the area of the key tops 61 and ensuring good pressability with the fingers.

Moreover, the colored layer 62 is formed in the back surface side (Z2 side in FIG. 2) of the key top member 61. As shown in FIG. In addition, it is good also as a key top structure 60 that this colored layer 62 does not exist.

Moreover, the presser 70 (shown with the broken line in FIG. 2) is provided so that it may protrude toward the board | substrate 71 from the back surface side of the colored layer 62. As shown in FIG. This presser 70 is integrally formed with an elastic sheet, for example, may be formed by bonding the elastic sheet to the back surface side of the colored layer 62, and the protrusion which becomes the presser 70 is formed, for example. You may form by bonding to the back surface side of the colored layer 62. FIG. The key top structure 60 may not include the presser 70, or may include it.

Moreover, the board | substrate 71 is provided in the state which opposes the key top structure 60. As shown in FIG. The fixed contact 72a, 72b and the disc spring member 73 are provided in the surface side of this board | substrate 71 which opposes the key top structure 60. As shown in FIG. The fixed contacts 72a and 72b are part of the conductive portion formed in the substrate 71. In addition, the disc spring member 73 corresponds to an example of the pressing object of the claim. The disc spring-like member 73 has a form in which the outer appearance is reversed in the shape of a cup, and the edge portion of the disc spring-like member 73 is in contact with at least a part of the fixed contact 72a on the substrate. This disc spring member 73 is provided so that buckling (plane buckling) is possible. For this reason, when the user presses the key top 61a to apply a predetermined force or more to the disc spring-shaped member 73, a part of the disc spring-shaped member 73 is deformed from the convex in the Z1 direction to a concave state. At this time, a part of the disc spring-shaped member 73 comes into contact with the fixed contact 72b, and thus a state in which electrical conduction is possible occurs.

When the key top 61a is released, the buckling state is lost due to the elasticity of the disc spring member 73, and the original state is returned. Thereby, the disc spring-shaped member 73 and the fixed contact 72 become non-contact, and are in an electrically non-conductive state.

<About the manufacturing method of a key top structure>

Next, the manufacturing method of the key top structure 60 which concerns on this embodiment is demonstrated. 3 is a flowchart for explaining the outline of the method for manufacturing the keytop structure 60. 4 is a schematic diagram for demonstrating the manufacturing method of the key top structure 60 centering on the shaping | molding die 101. As shown in FIG.

When manufacturing the key top structure 60, first, the liquid ultraviolet curable resin M is filled into the shaping | molding die 101 from the pressure tank not shown (S01; see FIG. 4 (a)).

Next, the feed roller 102 on which the base material 110 is placed is positioned on one end side (left side in FIG. 4 (b)) of the molding die 101 (S02). After that state, the feed roller 102 is moved from one end side to the other end side (right side in FIG.4 (c)) (S03). Then, as shown in FIG.4 (c), the ultraviolet curable resin M of the state in which the upper surface is not flat is extruded, and the upper surface of the said ultraviolet curable resin M will become flat along the base material 110. FIG. . And the base material 110 is located in the state which covered the recessed part 103 in the upper surface side of ultraviolet curable resin M. As shown in FIG.

Here, in the present embodiment, as shown in FIG. 5, when the uncured key top member 61 (ultraviolet curable resin M) is viewed from above, the key top member 61 (ultraviolet curable resin M) As for the dimension of the short direction of X, the dimension X2 of the short direction along the edge part of a longer direction is provided smaller than the dimension X1 of the short direction along the center of a long direction. This is because shrinkage at the time of hardening occurs more in the edge part of a long direction. Therefore, in the key top member 61 after hardening, the above-mentioned dimension X1 = the above-mentioned dimension X2. In addition, some equations may be included in such an equation.

If the idea as shown in FIG. 5 mentioned above is further developed, it will be in the state shown in FIG. As shown in FIG. 6, when the uncured key top member 61 (ultraviolet curable resin M) is viewed from above, the dimension in the long direction of the key top member 61 (ultraviolet curable resin M) is short. The dimension Y2 of the longitudinal direction along the edge part of a direction shorter than the dimension Y1 of the longitudinal direction along the center of a direction is provided small. In this way, in the key top member 61 after hardening, the above-mentioned dimension Y1 = the above-mentioned dimension Y2. In addition, some equations may be included in such an equation.

In addition, shrinkage at the time of hardening of the uncured key top member 61 (ultraviolet curable resin M) also occurs in the key top 61. That is, if the state before hardening is matched to a prescribed dimension without considering hardening shrinkage, as shown to FIG. 7 (A), the center part is inside rather than the edge part of each side of the key top 61 by hardening of ultraviolet curable resin (M). To concave. Therefore, in FIG.7 (B), such hardening shrinkage is anticipated, and when UV cure resin M is uncured, the center part is outward rather than the edge part of each side of the key top 61 (key top 61). To protrude to the side spaced apart from the inside. That is, the recess 103 of the molding die 101 is left in a state in which the key top 61 on the left side of FIG. 7B is produced. Then, as shown in the right side of FIG. 7 (B), the key top 61 of a prescribed size is formed by hardening shrinkage.

Subsequently, the ultraviolet irradiation device 105 is brought close to the molding die 101 to irradiate ultraviolet rays (S04; FIG. 4 (d)). And when ultraviolet-ray irradiation for the predetermined time is performed, ultraviolet-curable resin M hardens. After the irradiation of the ultraviolet rays is completed, the ultraviolet irradiation device 105 is evacuated upward. Then, the part solidified as the key top member 61 is peeled from the shaping | molding die in the state affixed on the base material 110 (S05).

Subsequently, the part where the key top member 61 is affixed on the base material 110 is taken out, and the base material is peeled off from the key top member 61 (S06). Here, in order to make it easy to peel off the base material 110 from the key top member 61, you may make it apply | coat a predetermined chemical liquid to a base material. Moreover, as a timing which peels the base material 110 from the key top member 61, for example, immediately after irradiation of the ultraviolet-ray from the ultraviolet irradiation device 105 is preferable.

The key top member 61 is manufactured as mentioned above. Thereafter, the colored layer 62 may be formed on the back surface of the key top member 61 by, for example, decorative printing. Moreover, you may make it perform the heat processing (heating process) for hardening the key top member 61 manufactured as mentioned above.

<< to realizing the key top structure in this embodiment >>

[One. Necessity of UV Curable Resin]

When the key top structure is formed by injection molding, the resin is poured into a mold and then cured, but there is a molding constraint that it is difficult to form the key top with a thickness dimension of 0.3 mm or less, for example, from the molding constraint. In addition, in the key top member, it is difficult to form a shape in which a plurality of key tops are continuous due to design constraints of a portion for pouring resin such as an injection hole in a mold and a flow path thereafter, and thus form a zigzag key top. After that, it is necessary to separate and assemble the key top.

In comparison with such injection molding, in a molded article using an ultraviolet curable resin, a plurality of key tops can be formed. However, in the case where a plurality of key tops are continuous, it is difficult to have a constant thickness dimension as the key top because problems such as bubble mixing, sink marks, and the like arise. That is, when manufacturing a molded article using an ultraviolet curable resin, it is difficult to manufacture a large thickness dimension, but on the contrary, in recent years, it can be said that it is very suitable for the thinning (the molded article with a small thickness dimension) which is highly demanded. .

Moreover, when making the size of the top surface of a keytop large in order to make a keytop structure easy to operate, the space | interval between keytops will become small as the upper half. If the distance between the key tops becomes small, interference with adjacent key tops may cause interference and the operational feeling may be impaired. Here, FIG. 8 shows the relationship between the distance between the adjacent key tops and the load required when the key top is pressed. As can be seen from FIG. 8, when the distance between the adjacent key tops becomes larger, the load at the time of pressing becomes small and the operation feeling is good.

Moreover, in order to reduce the space | interval between the adjacent key tops, and to improve the operation feeling when a key top is pressed, all the key tops are cut out, and it attaches | attaches and attaches at a predetermined pitch on the sheet-shaped member with high elastic modulus. It is also conceivable to employ a technique.

That is, in order to improve the feeling of pressing at the time of operation, it is necessary to transmit the load change at the time of the pressing of the pan spring member below the key top to the key top without loss. However, in the key top structure in which the key tops are continuous, as the key top pressed is deformed, the adjacent key tops also deform continuously with respect to the pressed key top. Therefore, the load required for such deformation adds the combined load of the load required for these deformations to the load required when pressing the disc spring member, and the feeling of pressing during operation deteriorates. In order to avoid such deterioration of the feeling of press, it is necessary to cut out all the key tops formed from the ultraviolet curable resin as described above, and to attach them to the sheet-shaped member having a low elastic modulus by adhesion or the like.

However, in this case, there is a problem that the man-hour at the time of manufacture becomes complicated and the man-hour is large. Moreover, the problem that it is difficult to form the space | interval of key top uniformly also arises, and in some cases, the assembly misses, such as an incorrect key top space | interval, may arise. Therefore, it is difficult to employ the technique of cutting out all the molded key tops so as to be independent and attaching them to the sheet-shaped member having high elastic modulus by adhesion or the like.

[3. UV curable resin and base material]

By the way, in the present state, when producing a molded article as a key top member using an ultraviolet curable resin, it is necessary that the base material and the key top member are adhered. As described in the above-described manufacturing method, the film-like substrate is placed on the upper part of the mold where the recesses of the key top member are present, and the liquid ultraviolet curable resin which is more than the amount of resin of the key top member required is filled, Thereafter, the film-like substrate was moved while contacting a squeegee, and the liquid crystal UV curable resin was extruded at the site of the back surface side of the key top member to refine the shape, and then cured and solidified as a key top member. The molded article is taken out from the molding die.

In this way, since the key top member is formed, the molded article of the ultraviolet curable resin and the substrate are bonded or in a strong adhesive state. Therefore, in order to make the press feeling at the time of the above operation favorable, it is necessary to minimize the thickness dimension of a base material, or to use a flexible thing as a material of a base material. However, there exists a problem that curvature becomes large when the thickness dimension of a base material is minimized and when using a flexible thing as a material of a base material.

[4. Experimental result of key top structure in which base material exists]

In addition, the experimental results measured about the load and click feeling required for pressing at the time of each thickness measurement are changed in the thickness dimension of a base material between 0.05 mm-0.15 mm, and Table 1 is shown. Here, the click rate (%), which is an index value indicating a feeling of click, is a value (%) defined by the following equation when the same disc spring member is used. In addition, C represents a click rate (%), P represents a peak load (unit: grams), and B represents a bottom load (unit: grams). In addition, the peak load represents the maximum load before the pan spring member is buckled, and the bottom load represents the minimum load that can maintain the buckling state after the pan spring member is buckled. In addition, the material of the base material at this time is polyethylene terephthalate (PET).

C = 100 x (P-B) / P

Moreover, when the thickness dimension of a base material changes as shown in Table 1 mentioned above, the magnitude | size of the curvature of a key top structure at the time of each thickness dimension, whether the curvature can be correct | amended by a double-sided tape, and the grip feeling of an edge part Table 2 shows the experimental results measured for. In addition, the curvature of a key top structure here refers to the height dimension which the edge part of the back surface side of a key top structure raises with respect to the reference surface, when the center part in the back surface of a key top structure contacts a reference surface. In addition, the locking feeling at the end of the key top structure means that the local deformation occurs in the same direction as the warp at the curvature larger than the above-described warpage at the end of the key top structure, so that the touch applied to the hand when the user touches the end of the key top structure by hand. Say In Table 2, experiments are conducted using a keytop structure having a length dimension from one end to the other end of 50 mm.

In addition, when the thickness dimension of a base material changes as Table 1 mentioned above, the experiment result measured about the load and click feeling which are required at the time of changing the material (material) of a base material respectively is shown in a table. 3 is shown. In addition, in Table 3, the thickness dimension of each base material is 0.1 mm.

Here, although both materials and thickness dimensions are different, an example of a preferable load and click rate is described also from Table 3 mentioned above. The load of assembling and pasting the key top previously cut on the base material which is 0.2 mm in thickness, and a material is silicone rubber was 234g, and click rate was 27%.

[5. Discussion from Experimental Results of Key Top Structures with Substrate]

According to the experiment result of Table 1-Table 3, when the thickness dimension of a base material is 0.05 mm, comparatively favorable click feeling (operation feeling) was obtained. On the other hand, as the thickness dimension of the substrate increases from 0.1 mm to 0.125 mm, the feeling of click (operation feeling) is deteriorated. In particular, in a base material having a thickness dimension of 0.125 mm or more, the total load required at the time of clicking increases until the load change in the disc spring member is not felt very much.

Moreover, according to the above experimental result, when the thickness dimension of a base material is 0.05 mm, big warpage generate | occur | produces in a key top structure, while when the thickness dimension of a base material is 0.125 mm, curvature in a key top structure is suppressed to about 1.5 mm. It is possible to do.

From this result, when the thickness dimension of the base material is 0.05 mm, the warp of the key top structure is large, but since the base material itself is thin and there is no so-called waist, for example, it is inserted into a planar shape or the like. It is easy to calibrate. On the other hand, when the thickness dimension of a base material is 0.125 mm, there is little curvature in a key top structure, and fixing with a double-sided tape is also possible. Therefore, at first glance, it seems to be good. However, as shown in Fig. 9, at the end of the key top structure, the double-sided tape is offset with respect to the substrate or the like, whereby a portion that cannot be fixed by the double-sided tape is formed. Here, the mounting so that the double-sided tape is protruded from the key top structure is not possible due to the dimensional constraints of the base, which is the mounting portion of the key top structure, and appearance problems. Therefore, the part which the double-sided tape offsets with respect to a base material etc. occurs in the edge part of a key top structure.

And since a local deformation | transformation generate | occur | produces in this part, it feels a jam, for example by hand touching at the time of key operation. In addition, since heat generation from a circuit or the like occurs inside the mobile terminal 10, the spurs are applied to the above-described local deformation. Furthermore, there exists a possibility that a key top structure may peel from a case, when the peeling force other than assumed is applied to the edge part which a locking feeling produces.

Moreover, the edge part of a base material is also attached to the back side in the state which encloses a double-sided tape, and is fixed to the predetermined | prescribed fixed part via this double-sided tape.

As mentioned above, even if the overall curvature of a keytop structure was able to be reduced by employ | adopting the method of making the thickness dimension of a base material large, it turned out from the experiment result that local deformation | transformation at the edge part of a keytop structure, and a feeling of jamming cannot be eliminated. Furthermore, it is also necessary to consider that there is a request for thinning the keytop structure in the actual apparatus. As described above, it is in a very difficult state to eliminate the feeling of jamming at the end of the key top structure among the conventional techniques and ideas.

Here, when dealing with the cause of the warp, in the key top structure, curing shrinkage occurs in the process of curing the uncured ultraviolet curable resin. For example, in the case of radically polymerizable ultraviolet curable resins whose main components are acrylates and unsaturated polyesters as the commonly used ultraviolet curable resins, curing shrinkage of about 5 to 10% occurs. On the other hand, the base material is not excellent in elasticity. Therefore, if ultraviolet curable resin is located in the surface side of a base material, the deformation | transformation in which the surface side where the said ultraviolet curable resin is located becomes concave with the hardening shrinkage of ultraviolet curable resin.

[6. Trial of new technique]

Hence, we searched for a method that adopts a completely different approach from the conventional method. In this groping, the method of removing a base material which theoretically becomes the thinnest the thickness dimension of the base material was examined. In addition, in the present state, in the key top structure, it is not confirmed that another person adopts this approach. In addition to the fact that in the production of a molded article using the ultraviolet curable resin of the present state, the presence of the base material is necessary due to the cause of the curing of the ultraviolet curable resin, the reference site is not determined. As can be seen from the above, it is also considered that there is a possibility of being bound by the idea of increasing the thickness dimension of the substrate because the warpage can be reduced to some extent by adopting the approach of increasing the thickness dimension of the substrate.

In addition, as mentioned above, since the presence of a base material is indispensable in preparation of the molded article using the ultraviolet curable resin of the present state, shaping | molding as a key top member will become difficult when a base material is removed when using an ultraviolet curable resin. Therefore, although a new idea is required, various findings suggest that the UV-curable resin is adhered to the substrate until the UV-curable resin is cured, and the substrate is peeled off after the UV-curable resin has cured. I came up with a technique and examined the details of that technique.

[7. Examination from thickness dimension plane of new technique]

In this study, the thickness of the sheet-shaped portion of the key top member, which is a molded product of the ultraviolet curable resin, was varied between 0.03 mm and 0.15 mm, and the results of experiments measured for the load and click feeling required for pressing at each thickness dimension. Is shown in Table 4. In addition, in this experiment, H17 (brand name) whose Shore-D hardness of Nogawa Chemical is 50 degree | times is used as a material of ultraviolet curable resin.

Comparing the experimental results of Table 4 and the experimental results of Table 1 described above, the following can be said. That is, when employ | adopting the method of peeling a base material after hardening an ultraviolet curable resin, a total load was reduced significantly and a click feeling (operation feeling) also improved significantly. In addition, in the key top member, warpage and local deformation were almost invisible. Since the ultraviolet curable resin is formed of a material having sufficiently high flexibility than the base material, it is possible to realize a state in which warpage and local deformation are not a problem.

[8. Examination from the aspect of the durability of new technique]

Subsequently, when the key top structure is mounted on the actual device, its durability also needs to be considered. In particular, as the thickness dimension of the thinnest sheet-like portion becomes thinner, anxiety remains in durability. Then, the key test was performed about the thing of each thickness dimension in above-mentioned Table 4, and the experiment which confirmed the number of keystrokes which the tear of the thinnest sheet-shaped part generate | occur | produces was performed. Moreover, the buckling load of the disc spring member used in such a key test is also described. Moreover, in this experiment, it is performed with the keying timing of 3.3 times / second, the load at the time of a keying is made into 750g, the key sheet is arrange | positioned on the upper surface of a key top, and the keying test is performed through this key sheet. In addition, a keying test was performed using a disc spring member having a buckling load of 170 g.

From the experimental results of Table 5, it was confirmed that depending on the use conditions, it could be sufficiently used if the thickness was in the range of 0.03 mm to 0.15 mm.

[9. Review from aspect of ingredient constitution of new technique]

Subsequently, based on the above Table 5, the composition of the ultraviolet curable resin is changed within the range of the thickness dimension of 0.03 mm to 0.15 mm, and the result of examining whether or not it can be used as an actual product (applicable to the product). , It was as Table 6 below. In addition, about whether it is applicable to a product by the key test under 750g load of Table 6, when it shows that it is applicable to a product, even if it does not produce tear even if it carries out 250,000 times of key test, it represents with "(circle)" and represents 250,000 times. When the tear occurred in the keystroke test, it is indicated by "x" because it is not applicable to a product. Moreover, about whether it is applicable to a product in the keystroke test under a 10 kg load in Table 6, when it shows that even if tearing does not still occur even after 5,000 keystroke tests, it shows as "(circle)" and represents 5,000 times. When the tear occurred in the keystroke test, it is indicated by "x" because it is not applicable to a product.

In said Table 6, types 1-6 have shown the kind (material) of ultraviolet curable resin. The ultraviolet curable resin of these types 1-6 is an acrylate-type ultraviolet curable resin, and is adjusted so that it may become each measured hardness by changing a polymerization degree or a crosslinking density.

From the above experimental result of Table 6, it was confirmed that it is suitable as an actual product about the thing of Type 3 to Type 6 among the above-mentioned ultraviolet curable resin.

10. About actual production]

Based on the above experimental results and the result of the consideration, the molding die 101 is produced and the key top structure which becomes a product is manufactured. In this manufacture, in order to improve a feeling of click (operation feeling) based on the result of Table 4 and Table 5 mentioned above, the thickness dimension of a sheet-like part is 0.03 mm. In addition, the thickness dimension of a key top is made into 0.4 mm in consideration of the height of a required key top, FIG. Moreover, when manufacturing such a key top structure, the thing of thickness 0.05mm is used as a film-form base material. In addition, in S04 of FIG. 3, ultraviolet-ray is hardened | cured for about 20 second with respect to liquid ultraviolet curable resin. In addition, in S06 of FIG. 3, the film-form base material is tensioned and peeled so that it may form an angle of 35 degrees with respect to the state before peeling using a separator machine.

Thereafter, heat curing was performed at 80 degrees Celsius for about 2 hours to stabilize the dimensions of the molded article. Thereafter, for commercialization, a decorative layer is printed on the back side of the key top member to form a colored layer, and further dried by heating at 80 degrees Celsius for about 2 hours to dry the colored layer. Thereby, the key top structure as shown in FIG. 2 in which the decoration was performed is obtained. In the key top structure obtained through each of these steps, warpage and local deformation do not occur, and in particular, there is no feeling of jam due to the occurrence of local deformation at the end of the key top structure. Moreover, since it is manufactured without cutting out a key top, it has a key top structure excellent also in assembly property.

<About an Example>

Next, evaluation (embodiment) regarding the operation | movement at the time of pressing of the keytop structure 60 which has the structure as mentioned above is demonstrated.

(Sample production method)

First, in order to manufacture the key top member 61, H17 (brand name) whose Shore-D hardness made from Nogawa Chemical mentioned above as 50 degreeC was prepared as an ultraviolet curable resin. Such ultraviolet curable resin was hardened by the manufacturing method shown in FIG. 3, FIG. 4 mentioned above, and the key top member 61 was produced. At this time, the key top 61a is manufactured using the thing made from polyethylene terephthalate (PET) as a base material 110 (thickness dimension 0.05mm). The produced key top member 61 has a Shore-D hardness of 50 degrees. Further, a colored layer 62 having a thickness of 10 µm was formed on the back surface side of the key top member 61 using a polyester ink.

Moreover, the presser 70 which has a protrusion dimension of 0.2 mm was formed in the back surface side of the key top member 61. As shown in FIG. Moreover, the plate spring member 73 was provided in the state which contacted the presser 70. As shown in FIG. The disc spring-shaped member 73 is in a state having a projected dimension (height dimension) of 0.26 mm from the surface of the substrate 71. Moreover, the buckling load of this disc spring member 73 is 170 g.

(Example 1)

In this state, the thickness dimension T of the key top 61a is set to a fixed value of 0.4 mm without changing the thickness dimension S of the sheet-shaped portion 61b, and the distance between the key tops 61a ( Without changing L), the fixed value was 0.2 mm, and the operation feeling and malfunction of the key top structure 60 were evaluated based on the following criteria.

Easy to press and no malfunction.

○ ··· There is discomfort when pressed, but no malfunction.

△ ··· There is a malfunction when pressed.

From the results of Table 7, the thickness dimension S of the sheet-like portion 61b is found to be easily pressed when there is a range of 0.03 mm to 0.15 mm, and there is no malfunction.

(Example 2)

Next, while changing the distance L between the key tops 61a, the thickness dimension T of the key top 61a is set to a fixed value of 0.4 mm without changing, and the thickness dimension S of the sheet-like portion 61b. Without changing the value, the fixed value was 0.05 mm, and the operation feeling and malfunction of the key top structure 60 were evaluated based on the following criteria.

Easy to press and no malfunction.

○ ··· There is discomfort when pressed, but no malfunction.

△ ··· There is a malfunction when pressed.

From the results in Table 8 above, it can be seen that the spacing L between the key tops 61a is easily pressed when there is a range of 0.2 mm or more, and there is no malfunction.

Moreover, when the result of Example 1 and Example 2 mentioned above is put together, it is as shown in Table 9.

From Table 9 mentioned above, while the thickness dimension S of the sheet-shaped part 61b exists in the range of 0.03 mm-0.15 mm, the predetermined space | interval L between the some keytop 61a is 0.2 mm-1.0 mm. It is preferable to exist in the range of. In that case, the key top structure 60 is easy to press and there is no malfunction.

(Example 3)

Next, the Example at the time of changing the Shore-D hardness of the key top member 61 is shown below. In this embodiment, the thickness dimension T of the key top 61a is set to a fixed value of 0.4 mm without changing, and the thickness dimension S of the sheet-shaped portion 61b is set to a fixed value of 0.05 mm without changing. The distance L between the key tops 61a is not changed, but is set to a fixed value of 0.2 mm. And the feeling of operation and the malfunction of the key top structure 60 were evaluated based on the following references | standards.

Easy to press and no malfunction.

○ ··· There is discomfort when pressed, but no malfunction.

△ ··· There is a malfunction when pressed.

From the result of Table 10 above, it is understood that the Shore-D hardness in the key top member 61 is easy to press and there is no malfunction when the Shore-D hardness is in the range of 40 to 80 degrees.

Here, in the state in which the base material 110 is affixed on the key top member 61 (state shown in FIG. 10), the deformation suppression means mentioned in a claim is not comprised. In other words, the deformation suppressing means is realized for the first time by peeling the substrate 110 from the keytop member 61. That is, even though the substrate hardly shrinks, the key top member 61 shrinks upon curing. Deformation suppression means for suppressing warpage and local deformation caused by the unbalance of the shrinkage of these two members may be understood to be embodied in the keytop structure 60 by adding a step (trouble) to peel off the substrate 110. have.

Moreover, from the result of each Example mentioned above, when Shore-D hardness is 50 degree | times (fixed value), while the thickness dimension S of the sheet-like part 61b exists in the range of 0.03 mm-0.15 mm, When the predetermined space | interval L between the key top 61a exists in the range of 0.2 mm-1.0 mm, it can be said that it functions suitably as a deformation suppression means. Furthermore, if the Shore-D hardness is in the range of 40 degrees to 80 degrees, a good function can be ensured as the deformation suppressing means.

In addition, the deformation | transformation tolerance means mentioned in the claim can be said to function satisfactorily if the thickness dimension S of the sheet-like part 61b exists in the range of 0.03 mm-0.15 mm. Especially, when the thickness dimension S of the sheet-like part 61b exists in the range of 0.03 mm-0.10 mm, it is still more preferable, and when it exists in the range which is 0.03 mm-0.05 mm, it becomes still more preferable. In addition, when the deformation | transmission allowance means has pressed any key top 61a from the ceiling surface side, only the plate spring-like member 73 (press object) of the pressed key top 61a is pressed, and it is other than the pressed key top 61a. It is preferable to make the other key top 61a press independently so that the plate spring-shaped member 73 (press object) may not be pressed.

<Effect>

According to the manufacturing method of the key top structure 60, the portable terminal 10 (electronic device), and the key top structure 60 of the above-mentioned structure, although ultraviolet curable resin shrinks on the occasion of hardening, from the key top member 61, Since the deformation suppression means is embodied by peeling off the base material 110, it becomes possible to suppress the deformation due to shrinkage after curing of the key top member 61. Therefore, it becomes possible to suppress the deformation so that the surface side (ceiling surface side) of the key top structure 60 becomes concave.

In addition, in this embodiment, since the deformation | transform suppression means is implement | achieved by peeling the base material 110 from the key top member 61 after the shrinkage | contraction after hardening exists in the predetermined range, the key top structure 60 (key top member 61) ) Is in a state where the base material which is not excellent in elasticity is not adhere | attached. Therefore, when a user presses the key top structure 60, the state which is not excellent in a click feeling can be eliminated.

Furthermore, in this embodiment, local deformation | transformation in the edge part of the keytop structure 60 can be suppressed, and the feeling of the said edge part can be eliminated. Here, in the state where the locking feeling by a local deformation | transformation generate | occur | produces, when an unexpected peeling force is applied to the edge part which a locking feeling arises, there exists a possibility that the key top member 61 may peel from the base material 110, but in this invention, Since the 110 is peeled off to form the key top structure 60, such a problem can be eliminated.

In particular, in the mobile terminal 10 shown in Fig. 1, a key arrangement such as a QWERTY keyboard arrangement is employed, so that the number of the keytops 61 is larger than that of a conventional mobile telephone apparatus or the like. It is. In this case, while the size of the mobile terminal 10 is limited, the area of the key top 61 is increased while arranging a plurality of key tops 61 (e.g., 30 or more). Inevitably, the distance between the key tops 61 adjacent to each other becomes small. By applying the key top structure 60 according to the present embodiment to such a mobile terminal 10, it is possible to suppress deformation such that the surface side of the key top structure 60 is concave as described above while having excellent click feeling. In addition, it becomes possible to eliminate the above feeling of jamming.

In addition, in this embodiment, while the thickness dimension S of the sheet-shaped part 61b exists in the range of 0.03 mm-0.15 mm, the predetermined space | interval L between the some key top 61a is 0.2 mm-1.0 It is preferable to exist in the range of mm.

In such a configuration, the deformation caused by shrinkage after curing of the key top member 61 can be suppressed more favorably, and the user can press the key top structure 60 to have an excellent feeling of click.

Moreover, in this embodiment, it is preferable that the key top member 61 is provided in the range whose Shore-D hardness is 40 degree | times-80 degree | times. In such a configuration, the deformation caused by shrinkage after curing of the key top member 61 can be suppressed more favorably, and the user can press the key top structure 60 to have an excellent feeling of click.

In addition, in this embodiment, when any keytop 61a is pressed from the top surface side, the keytop structure 60 presses only the object to be pressed of the pressed keytop 61a, and other keytops other than the pressed keytop 61a. It is preferable to provide deformation | transformation allowance means for making it press independently so that it does not press | press a press object.

In such a configuration, it is possible to reliably press only the dish spring-shaped member 73 corresponding to the pressed key top 61a. Therefore, when the key top structure 60 is used for an electronic device such as the mobile terminal 10, it becomes possible to prevent malfunction when pressed.

Moreover, in this embodiment, the installation part for installing the key top structure 60 is provided in the case part 20, and this installation part deform | transforms by contacting the key top structure 60 directly or indirectly. It is preferred to be part of the components of the suppression means. If comprised in this way, it becomes possible to suppress the deformation | transformation by the shrinkage after hardening of the key top member 61 more favorably. Therefore, it becomes possible to suppress the deformation | transformation so that the surface side of the key top structure 60 may become concave more favorably.

In addition, in this embodiment, as shown in FIG.7 (B), in the state which UV cure resin M is uncured, the center part is outside from the edge part of each side of the key top 61 (the key top 61). To protrude from the inside). Furthermore, as shown in the right side of FIG. 7B, the key top 61 having a prescribed size is formed by curing shrinkage. Thereby, the key top 61 with little influence of hardening shrinkage can be implement | achieved.

<Modifications>

As mentioned above, although the key top structure 60 which concerns on one Embodiment of this invention, the portable terminal 10 as an example of an electronic device, and the manufacturing method of the key top structure 60 were demonstrated, this invention can be variously modified other than that. It is supposed to be done. This is described below.

In the above-described embodiment, as shown in FIG. 11, the keytop structure 60 may be manufactured. That is, the base 110 is bent to contact the molding die 101 so that the top surface side of the key top member 61 is convex (for that purpose, the molding surface 101a of the molding die 101 is curved to be concave). It is good to harden | cure liquid ultraviolet curable resin (M) in that state. In this case, the sheet-like portion 61b and the substrate 110 can be regarded as approximately horizontal or horizontal due to shrinkage when the liquid ultraviolet curable resin M is cured. It can be kept.

In addition, the degree of curvature of the base material 110 (the degree of curvature of the shaping | molding surface 101a) is a shrinkage | contraction when the liquid ultraviolet curable resin M hardens | cures, and at the time of the said hardening, the sheet-shaped part 61b and It is preferable to set so that the base material 110 may become a state which can be regarded as all substantially horizontal or horizontal.

In addition, in the above-described embodiment, the case where the mobile terminal 10 as shown in FIG. 1 is used is described. However, the mobile terminal is not limited to that shown in FIG. For example, the present invention may be applied to the mobile telephone apparatus 10A which is a kind of mobile terminal as shown in FIG. In addition, in the mobile telephone apparatus 10A shown in FIG. 12, as in the mobile terminal 10 shown in FIG. 1, the case portion 20, the display portion 30, the cursor key portion 40, and the key arrangement portion 50 are provided. Equipped with.

Moreover, the cursor key part 40 has the annular button part 41 and the center button part 42, and these cursor key part 40 and the annular button part 41 are the key top 61a from the opening of the case part 20. As shown in FIG. The celestial surface side (refer FIG. 2) protrudes. Here, the annular button part 41 has a site | part which presses by 90 degree space | intervals, for example. In addition, the center button part 42 is a part in which the pressed part (the top surface side of the key top 61a) is surrounded by the annular button part 41.

Similarly to the cursor key portion 40, the key arrangement portion 50 protrudes from the opening of the case portion 20 in the top surface side of the key top 61a. As shown in FIG. 1, this key arrangement | positioning part 50 arrange | positions three key tops 61a of the same shape side by side in the X direction and five in the Y direction, for example.

Also in such a mobile telephone apparatus 10A, it becomes possible to suppress deformation due to shrinkage after curing of the key top member 61. Furthermore, when the user presses the key top structure 60, the state in which the click feeling is not excellent can be eliminated. In addition, local deformation at the end of the key top structure 60 can be suppressed, and a feeling of locking of the end can be suppressed, and an unexpected peeling force is applied to the end where the feeling of locking occurs, so that the key top member 61 is the substrate 110. It becomes possible to eliminate the problem of peeling off from).

In addition, in the above-described embodiment, the shape of the top surface of the key top 61a is explained. However, the shape of the top surface of the key top 61a is not limited to being flat, but may be other shapes (for example, curved, concave, convex, corrugated, etc.).

10... Mobile terminal (corresponds to an example of electronic device)
20... Case part
30 ... Display portion
40 ... Cursor Key
50 ... Key array
60 ... Key top structure
61... Key top member
61a... Key top
61b ... Sheet shape
62 ... Colored layer
70 ... Presser
71 ... Board
72a, 72b... Fixed contact
73 ... Countersunk spring member (corresponds to an example of the push object)
100 ... Manufacturing device
101 ... Mold
101a ... Forming surface
102... Feed roller
103 ... Concave portion
105 ... Ultraviolet irradiation device
M ... UV curable resin

Claims (13)

By curing the ultraviolet curable resin, a sheet-shaped portion and a plurality of key tops are formed, and the key tops are provided with a larger thickness than that of the sheet-shaped portion, and the plurality of key tops are arranged in a row with a predetermined interval. The key top member having the part becoming,
When hardening the said ultraviolet curable resin with respect to a base material, and forming the said key top member, the deformation | transformation by the shrinkage after hardening of the said key top member is suppressed, and after the shrinkage after hardening of the said key top member falls in a predetermined range, the said base material And deformation suppression means constituted by peeling off the keytop member. The method of claim 1,
The thickness dimension of the said sheet-shaped part exists in the range of 0.03 mm-0.15 mm, and the predetermined space | interval between a plurality of said key tops is a key top structure characterized by being in the range of 0.2 mm-1.0 mm. By curing the ultraviolet curable resin, a sheet-shaped portion and a plurality of key tops are formed, and the key tops are provided with a larger thickness than that of the sheet-shaped portion, and the plurality of key tops are arranged in a row with a predetermined interval. It is provided with the key top member which has a part,
The thickness dimension of the said sheet-shaped part exists in the range of 0.03 mm-0.15 mm, and the predetermined space | interval between a plurality of said key tops is a key top structure characterized by being in the range of 0.2 mm-1.0 mm. The method according to claim 2 or 3,
The key top member is characterized in that the Shore-D hardness is provided in the range of 40 degrees to 80 degrees. The method according to claim 2 or 3,
The key top member is adapted to press only the object to be pressed of the key top which is pressed when any of the key tops are pressed from its celestial side, and to allow the key top other than the pressed key top to be pressed independently so as not to press the object to be pressed. A key top structure comprising a deformation allowance means. In addition to having a key top structure according to claim 2,
Has an installation site for installing the key top member,
The mounting portion is an electronic device characterized in that it becomes part of the component of the deformation suppression means by directly or indirectly contacting the keytop member. An injection step of injecting the liquid ultraviolet curable resin into the concave portion of the molding die;
An installation step of covering the ultraviolet curable resin injected into the recess and positioning the substrate in a state of being in close contact with the ultraviolet curable resin;
A curing step of irradiating ultraviolet rays to the liquid ultraviolet curable resin, curing the ultraviolet curable resin by a predetermined amount to produce a keytop member, and
A peeling step of removing the integral part of the base material and the key top member from the molding die;
And a peeling step of peeling off the substrate from an integral body of the substrate and the keytop member after shrinkage after curing of the keytop member falls within a predetermined range. The method of claim 1,
The keytop member is adapted to press only the object to be pressed of the keytop which is pressed when any of the keytops are pressed from its celestial side, and to allow the keytop other than the pressed keytop to be pressed independently so as not to press the object to be pressed. A key top structure comprising a deformation allowance means. 5. The method of claim 4,
The keytop member is adapted to press only the object to be pressed of the keytop which is pressed when any of the keytops are pressed from its celestial side, and to allow the keytop other than the pressed keytop to be pressed independently so as not to press the object to be pressed. A key top structure comprising a deformation allowance means. In addition to having the key top structure of claim 1,
Has an installation site for installing the key top member,
The mounting portion is an electronic device characterized in that it becomes part of the component of the deformation suppression means by directly or indirectly contacting the keytop member. In addition to having the key top structure of claim 4,
Has an installation site for installing the key top member,
The mounting portion is an electronic device characterized in that it becomes part of the component of the deformation suppression means by directly or indirectly contacting the keytop member. In addition to having the key top structure of claim 5,
Has an installation site for installing the key top member,
The mounting portion is an electronic device characterized in that it becomes part of the component of the deformation suppression means by directly or indirectly contacting the keytop member. delete

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