JP4717761B2 - Manufacturing method of cover member for pushbutton switch and bonding jig - Google Patents

Description

  The present invention relates to a method for manufacturing a cover member for a push button switch by bonding a key top to a cover base material using a photoreactive adhesive, and an adhesive jig suitably used for the manufacturing method.

  Conventionally, as a cover member for a push button switch used in an operation unit of a mobile device such as a mobile phone and a personal digital assistant (PDA), a key top made of a hard resin and a predetermined key top arrangement of a cover base made of a rubber elastic body Many are used that are bonded to each other using a photoreactive adhesive.

In order to manufacture such a cover member for a pushbutton switch, for example, in Patent Document 1 below, a photoreactive adhesive layer is provided between a hard resin key top and a cover base made of a rubber elastic body. After forming and positioning the key top and the cover base material using the upper and lower jigs and bonding them together, after retracting the upper jig, the key top and the cover are reacted by irradiating light and reacting the adhesive layer A method for manufacturing a pushbutton switch cover member by bonding to a base material is described.
Japanese Patent No. 3597024

  However, when a pushbutton switch cover member is manufactured by such a manufacturing method, after positioning the key top and the cover base material by the upper and lower jigs, the upper jig is retracted to react the photoreactive adhesive. It must be irradiated with light. Therefore, there is a problem that the cover base material must be detached from the upper jig while the photoreactive adhesive is unreacted, and the cover base material and the key top are likely to be misaligned.

  Therefore, in the present invention, it is possible to react the photoreactive adhesive by preventing the positional deviation between the cover base material and the key top, and to adhere the key top to the cover base material with excellent positional accuracy. Another object is to provide a manufacturing method of a cover member for a pushbutton switch that can be used, and to provide an adhesive jig that can be suitably used in such a manufacturing method.

The manufacturing method of the cover member for pushbutton switches of Claim 1 which solves the said subject is a cover base on each opposing surface side of the 1st division jig and the 2nd division jig which can be positioned mutually and can oppose. The key top is arranged at a predetermined key top arrangement position of the cover base material by holding a material and a key top bonded to the cover base material, and facing each of the opposing surfaces, and the cover base A photoreactive adhesive is interposed between a material and the key top, and the photoreactive adhesive is reacted with the light transmitted through the cover base or the key top by irradiating light from the outside. The key top is adhered to the cover base material to manufacture a pushbutton switch cover member, and a through hole is formed at a position corresponding to the key top arrangement position of the first or second split jig. Ru provided The cover base material is both held, a support jig is detachably disposed in the through hole, and the back surface of the key base placement position of the cover base material is supported by the support jig. The photoreactive adhesive is applied to the key top arrangement position of the base material, the first split jig and the second split jig are opposed to each other, and the support jig is detached from the through hole. In this state, the light is irradiated from the through hole to cause the photoreactive adhesive to react.

An adhesive jig for a pushbutton switch cover member according to claim 2 includes first and second division jigs having opposed surfaces that are positioned and can be opposed to each other, and the opposite of the first division jig. The surface is provided with a cover base material holding part for holding the cover base material in a predetermined position, and the key top holding for holding the key top in a predetermined position on the facing surface of the second split jig. parts are provided, wherein the one said holding portion of the first and second split jig, while a through hole that penetrates is opened to the first and second split jigs, the through hole Is composed of a hole having an inner wall surface that is inclined so as to shrink from the back surface side toward the cover base material side .

An adhesive jig for a pushbutton switch cover member according to claim 3 includes first and second split jigs having opposing surfaces that are positioned to face each other and are opposed to each other. The surface is provided with a cover base material holding part for holding the cover base material in a predetermined position, and the key top holding for holding the key top in a predetermined position on the facing surface of the second split jig. A through hole is formed in the cover base material holding portion of the first split jig, and the first split jig is provided with a through-hole penetrating the first split jig. , is arranged detachably in the through-hole, characterized in that it comprises a support fixture for supporting the cover substrate.

According to a fourth aspect of the present invention, there is provided an adhesive jig for the pushbutton switch cover member, in addition to the configuration of the third aspect , wherein the first split jig includes the through hole and sucks the cover base material. The support jig has a gap capable of sucking the cover base material between the support jig and the through hole.

According to a fifth aspect of the present invention, there is provided an adhesive jig for the cover member for a pushbutton switch, in addition to the structure according to the third or fourth aspect , the support jig is disposed in the through hole and has a central portion opened. A tool main body and a pressing portion disposed at the center of the support jig main body and biased toward the cover base by an elastic member, the pressing portion corresponding to the through hole of the cover base It is comprised so that the center part of a position may protrude.

  According to the first aspect of the present invention, the first or second split jig is provided with a through hole, and the first split jig and the second split jig are opposed to each other from the through hole. Since light is incident and the photoreactive adhesive interposed between the cover base material and the key top is reacted, the cover base material and the key top are connected to a predetermined key by the first and second split jigs. The photoreactive adhesive can be reacted while being held at the top arrangement position. Therefore, it is possible to prevent the positional deviation between the cover base material and the key top and adhere the key top to the cover base material with excellent positional accuracy.

Further, according to the method of manufacturing a push button switch cover member according to claim 1, the back of the key top position of the cover substrate in the state of being supported by the support jig, the light on the key top position of the cover member Since the reactive adhesive is applied, the cover member is not deformed when applied, and it is easy to apply a desired amount of the photoreactive adhesive, and the first split jig and the second split jig The key tops are easily brought into close contact with the cover base material when facing each other.

  In addition, since the light is irradiated in a state where the support jig is detached from the through hole, the back surface of the cover base at the key top arrangement position is exposed, and the light reactive adhesive can be easily used by the light incident from the through hole. Can react.

According to the bonding jig of claim 2 or 3 , the key top holding portion and the cover base material are respectively held at predetermined positions on the opposing surfaces of the first and second division jigs that can be positioned and opposed to each other. Since the key top holding portion and the cover base material holding portion hold the key top and the cover base material, respectively, the first split jig and the second split jig are opposed to each other. Then, the key top can be accurately positioned and arranged at the key top arrangement position of the cover base material.

  In addition, since a through-hole penetrating from the back side is opened in one holding portion, it can be exposed to the through-hole while holding the cover base material and the key top in a predetermined position, If the photoreactive adhesive is reacted by irradiating light from the through hole, the cover base material and the key top can be easily bonded with excellent positional accuracy by preventing positional displacement.

Further, according to the bonding jig according to claim 2, since a hole having a inner wall surface through hole is inclined to contract toward the cover substrate side from the back side, the inclination of the inner wall surface of the through hole Thus, the light emitted from the outside can be collected. Therefore, the light irradiated to the entire opening on the back side of the through hole can be collected and the photoreactive adhesive can be reacted, so the irradiation amount from the light source can be reduced and the irradiation time can be shortened. It is possible to improve productivity.

According to the invention described in claim 3 , the first split jig has a through hole, and is provided with a support jig that is detachably disposed in the through hole and supports the cover base material. Therefore, if the support jig is arranged in the through hole, the portion corresponding to the through hole of the cover base material can be supported, and if the support jig is detached from the through hole, the through hole of the cover base material The part corresponding to can be exposed.

  For this reason, even if the first split jig is provided with a through hole, if a support jig is provided, the cover base material is not easily deformed when the photoreactive adhesive is applied. easy. Further, when the key top is brought into close contact with the surface of the cover base material, the key top can be securely adhered to the cover base material. Furthermore, when irradiating light, if the support jig is removed from the through hole, the key top arrangement position of the cover base material can be exposed and light can be easily irradiated. Therefore, the usability of the bonding jig is good.

According to the adhesive jig of claim 4 , the first split jig is provided with a through-hole, and is configured to suck and hold the cover base material, and the support jig covers the through-hole. Since there is a gap capable of sucking the substrate, the through hole can be used to suck and fix the cover member, and the configuration of the bonding jig can be easily simplified.

According to the bonding jig of claim 5 , the support jig that supports the key top arrangement position corresponding to the through hole of the cover base is provided on the cover base side by the elastic member at the center of the support jig main body. Since the pressing portion is configured to project the central portion of the position corresponding to the through hole of the cover base, the first split jig and the second split jig are provided. When the tool is brought closer, at the part corresponding to the through hole, the central part of the part corresponding to the through hole of the cover base material is first brought into contact with the key top in a state of protruding by the pressing part, and then further closer. The pressing portion is retracted against the urging force of the elastic member, and the key top can be brought into contact with the periphery of the portion corresponding to the through hole of the cover base material supported by the support jig body.

  For this reason, in the part corresponding to the through hole of the cover base material, the key top is in close contact with the center and the surroundings are in close contact with the key top. It can be moved to the side and discharged. As a result, it is difficult for bubbles to remain in the bonding portion between the cover base material and the key top, and it is easy to ensure the bonding strength and appearance quality.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  1 to 11 show Embodiment 1 of the present invention.

  First, the cover member 10 for pushbutton switches manufactured by Embodiment 1 of this invention is demonstrated.

  As shown in FIG. 1, this pushbutton switch cover member 10 has a key top 12 made of a hard resin bonded to a key sheet 11 as a cover base made of a rubber elastic body by a photoreactive adhesive 13. Configured.

  The key sheet 11 is connected to the non-actuating part 11a via the non-actuating part 11a provided on the periphery, the elastically deformable thin part 11b extending inward from the non-actuating part 11a, and the thin part 11b. A pedestal portion 11c is provided as a key top arrangement position having a planar shape substantially corresponding to the back surface of the top 12, and these are integrally formed. On the back side of the pedestal portion 11c, a contact mounting portion 11d is formed so as to protrude, and a metal movable contact 11e is provided on the top portion.

  The key sheet 11 is formed from a light-transmitting rubber elastic body. Examples of the material thereof include urethane rubber, acrylic rubber, butyl rubber, silicone rubber, isoprene rubber, or EPDM (ethylene-propylene-diene ternary copolymer). (Polymer)), natural rubber, or thermoplastic elastomer such as polyester or urethane. Here, silicone rubber is used.

  The key top 12 includes a bottom portion 12a bonded to the pedestal portion 11c of the key sheet 11, and a pressing portion 12b having a three-dimensional shape protruding from the bottom portion 12a. The bottom surface of the bottom portion 12a is formed in a planar shape, and a printing layer 14 such as characters that can be visually recognized from the pressing portion 12b side is provided.

  The key top 12 is molded from a light-transmitting hard resin, and examples of the material thereof include acrylic, methacrylic, polyester, or polycarbonate thermoplastic resins.

  Furthermore, examples of the photoreactive adhesive that bonds the key sheet 11 and the key top 12 include an ultraviolet curable adhesive, a visible light curable adhesive, and the like. A curable adhesive is used. Further, since the key sheet 11 is made of silicone rubber, a silane coupling agent made of an amine-based, acrylic-based, methacryl-based, vinyl-based, or epoxy-based silane compound is blended with the ultraviolet curable adhesive. Is preferred. This is because the adhesive strength can be improved and the improvement of moisture resistance can be expected. These can be used singly or in combination.

  Next, a method for manufacturing such a pushbutton switch cover member 10 will be described.

  In this manufacturing method, the key sheet 11 and the key top 12 are respectively manufactured and subjected to necessary processing, and then manufactured by bonding them using an adhesive jig.

  First, to produce the key sheet 11, for example, as shown in FIG. 2A, a key sheet upper mold 15a and a key sheet lower mold 15b are provided, and a cavity 15c having a shape corresponding to the key sheet 11 is provided. The key sheet mold 15 is molded. Here, it shape | molds in the state which connected the molded object of the some key sheet | seat 11. FIG.

  After the molding, as shown in FIG. 2 (b), the connecting portions of the plurality of key sheets 11 are cut, and unnecessary portions are cut off to obtain molded bodies of the individual key sheets 11.

  Here, since the molded body of the key sheet 11 is made of silicone rubber, as shown in FIG. 2C, the surface of the pedestal portion 11c is further subjected to a surface treatment for improving adhesiveness, whereby the key sheet is obtained. 11 is obtained. Examples of the surface treatment include ultraviolet irradiation treatment, corona treatment, plasma treatment, flame treatment, and the like, and here, ultraviolet irradiation treatment is performed. In this ultraviolet irradiation treatment, by irradiating the surface of the pedestal part 11c with short wavelength ultraviolet rays, oil and dirt adhering to the surface can be decomposed and washed, and the surface can be roughened to improve the adhesion. .

  On the other hand, in order to manufacture the key top 12, as shown in FIG. 3A, a key top upper mold 16a and a key top lower mold 16b are provided, and a cavity 16c having a shape corresponding to the key top 12 is provided. Molding is performed using a key top mold 16. Here, it shape | molds in the state which connected the molded object of the some keytop 12. FIG.

  Thereafter, as shown in FIG. 3B, the printing jig 17 is held on the pressing portion 12b side, the printing layer 14 is printed on the bottom portion 12a, and the connecting portions of the plurality of key tops 12 are cut. The individual key tops 12 are obtained by cutting away unnecessary portions.

  Thus, after producing the key sheet 11 and the key top 12, they are bonded together using the bonding jig 20 as shown in FIGS.

  As shown in FIG. 4, the bonding jig 20 includes a first dividing jig 21 that can hold the key sheet 11 on one surface side, and a first dividing jig 21 that is also shown in FIG. The support jig 23 that can be arranged on the back side of the surface holding the key sheet 11 and the key top 12 can be held on one side as shown in FIGS. A second split jig 22 that can be arranged to face the surface of the jig 21 that holds the key sheet 11 is provided.

  As shown in FIG. 4, the first dividing jig 21 includes a key sheet holding portion 21a that can hold the key sheet 11 on one surface side that can be opposed to the second dividing jig 22, and a key sheet holding portion 21a. And a through hole 21c provided in a position corresponding to the back surface of the base portion 11c. The key sheet holding portion 21a has a shape corresponding to the back surface of the non-actuating portion 11a, the thin portion 11b, and the pedestal portion 11c of the key sheet 11, and exposes the pedestal portion 11c to hold the key sheet 11 in a predetermined position. It is configured.

  The through hole 21c is offset inward from the outer peripheral edge of the pedestal portion 11c of the key sheet holding portion 21a and opens slightly smaller than the pedestal portion 11c. This through hole 21c has a tapered hole portion 21d whose inner diameter shrinks from the back side of the first split jig 21 toward the key sheet holding portion 21a side, and is constant from the tapered hole portion 21d to the key sheet holding portion 21a side. The straight hole portion 21e is formed with the inner diameter. Here, when the tip of the through hole 21c has an acute angle shape, the key sheet 11 is likely to be damaged when it comes into contact with the key sheet 11. Therefore, the straight hole 21e is provided to prevent the damage. Therefore, when it is difficult for damage to occur, the through hole 21c can be configured without providing the straight hole portion 21e.

  The first split jig 21 is provided with a positioning hole 21g for positioning with the support jig 23, and for positioning with the second split jig 22 on the end surface on the key sheet holding portion 21a side. Positioning pin 21h is provided. Further, a suction channel recess 21f continuous with the through hole 21c is provided on the back side.

  As shown in FIG. 4, the support jig 23 is disposed on the back side of the first split jig 21 and the support convex part 23 a that is detachably disposed in the through hole 21 c of the first split jig 21. The support base 23b can support the support convex portion 23a and can close the suction passage concave portion 21f of the first dividing jig 21.

  The support convex portion 23a has a diameter smaller than the straight hole portion 21e of the through hole 21c, and has a support surface 23c having a shape corresponding to the back side of the pedestal portion 11c of the key sheet 11 on the top surface. A recess is provided so as to accommodate the mounting portion 11d.

  Positioning pins 23d for positioning the first split jig 21 are provided on the support base 23b on the first split jig 21 side. By inserting the positioning pin 23d into the positioning hole 21g of the first split jig 21, the support jig 23 is disposed at a predetermined position on the back side of the first split jig 21, and the support convex portion 23a is The first split jig 21 is arranged at a predetermined position in the through hole 21c, and the suction flow path recess 21f of the first split jig 21 is hermetically closed.

  In this state, a gap in which gas can flow is formed between the side periphery of the support convex portion 23a and the inner wall of the through hole 21c, and the suction passage 23e opened in the support base portion 23b opens the suction passage concave portion 21f. By sucking this gas, the key sheet 11 can be sucked from the gap between the support convex portion 23a and the through hole 21c.

  On the other hand, as shown in FIG. 5, the second split jig 22 has a key top holding portion 22 a that can hold the key top 12 in a predetermined position on one surface side that can face the first split jig 21. In addition, it has a positioning hole 22b that is positioned by inserting the positioning pin 21h of the first split jig 21. The key top holding portion 22a has a shape corresponding to the pressing portion 12b of the key top 12, can be held by exposing the bottom portion 12a, and further, a suction hole penetrating the second dividing jig 22. 22c is opened.

  As shown in FIG. 6, when the second split jig 22 is opposed to the first split jig 21 and the positioning pins 21h of the first split jig 21 are inserted into the positioning holes 22b, the second split jig 22 is positioned. The second dividing jig 22 is opposed to the first dividing jig 21 at a predetermined position, and the bottom portion 12 a of the key top 12 is opposed to the pedestal portion 11 c of the key sheet 11.

  The bonding jig 20 is preferably made of metal from the viewpoint of processing accuracy, and more preferably made of aluminum because it is relatively lightweight.

  Further, the surface of the bonding jig 20 may be subjected to a plating process or an alumite process for the purpose of preventing corrosion or the like, and a blasting process or the like for the purpose of facilitating the handling of the sticky key sheet 11 or the like. The surface may be uneven.

  When surface treatment is performed on the inner surface of the through-hole 21c of the first dividing jig 21, it is preferable to perform mirror treatment because the light collection efficiency can be improved.

  Furthermore, for the purpose of preventing the key top 12 from being scratched, a coating of a thermoplastic resin or a thermosetting resin may be applied to a portion of the second split jig 22 that contacts the key top 12. Furthermore, a part or all of each of the split jigs 21 and 22 or the support jig 23 may be formed of a thermoplastic resin or a thermosetting resin.

  In order to bond the key top 12 to the key sheet 11 using such an adhesive jig 20, first, the support jig 23 is disposed on the back side of the first split jig 21 and positioned in the positioning hole 21g. Position and combine by inserting the pin 23d.

  Then, the back surface of the key sheet 11 is held by the key sheet holding portion 21a of the first dividing jig 21 and the support surface 23c of the support convex portion 23a of the support jig 23, and the suction flow passage concave portion 21f from the suction hole 23e. The inner base material is sucked, and the key sheet 11 is sucked and fixed from the gap between the support convex portion 23a and the through hole 21c.

  On the other hand, as shown in FIG. 5, the key top 12 is held by the key top holding portion 22a of the second dividing jig 22, and is sucked from the suction hole 22c to fix the key top 12.

  Next, an ultraviolet curable adhesive 13 is applied to the pedestal 11 c of the key sheet 11. Here, the application of the adhesive 13 is performed using a transfer jig 25 arranged to face the key sheet holding portion 21a of the first dividing jig 21, as shown in FIG. First, the adhesive 13 is attached to the tip of the transfer pin 26 of the transfer jig 25 and placed on the pedestal 11c of the key sheet 11 (i), and the transfer jig 25 is lowered and attached to the transfer pin 26. The adhesive that is present is attached to the surface of the pedestal 11c (ii). Then, by raising the transfer jig 25, a predetermined amount of the adhesive 13 can be transferred and applied to the pedestal portion 11c.

  Thereafter, the first split jig 21 and the support jig 23 are reversed, and the surface of the first split jig 21 on which the key sheet holding portion 21 a is provided and the key top holding of the second split jig 22. The surface on which the portion 22a is provided is opposed. Then, by inserting the positioning pin 21h of the first dividing jig 21 into the positioning hole 22b of the second dividing jig 22, the first and second dividing jigs 21 and 22 are positioned and brought close to each other. . As a result, the bottom 12a of the key top 12 is accurately placed and brought into close contact with the pedestal 11c of the key sheet 11 with the adhesive 13 interposed.

  Next, the adhesive 13 between the pedestal 11c of the key sheet 11 and the bottom 12a of the key top 12 is cured by reacting with ultraviolet rays.

  At that time, as shown in FIG. 9, the bonding jig 20 is supported by the first dividing jig 21 while maintaining the first dividing jig 21 and the second dividing jig 22 facing each other. By removing the jig 23, the support protrusion 23a is detached from the through hole 21c. At this time, the key sheet 11 and the key top 12 are maintained in a state of being held by the holding portions 21a and 22a of the first and second dividing jigs 21 and 22, respectively, and are supported from the through holes 21c. By releasing 23a, the back side of the base portion 11c of the key sheet 11 is exposed in the through hole 21c.

  In this state, for example, ultraviolet rays are irradiated using an ultraviolet ray irradiation device 30 as shown in FIG.

  The ultraviolet irradiation device 30 is configured to convey the bonding jig 20 holding the key sheet 11 and the key top 12 at a predetermined speed, and to irradiate the bonding jig 20 on the conveyance means 31 with ultraviolet rays. An ultraviolet lamp 32 and a reflector 33 are provided.

  In the ultraviolet irradiation device 30, as shown in FIG. 11, the ultraviolet UV from the ultraviolet lamp 32 and the reflecting plate 33 enters from the through hole 21 c of the first split jig 21, and the pedestal portion of the key sheet 11. It is irradiated to the back side of 11c, and is transmitted to the adhesive 13 that is transmitted through the key sheet 11 and interposed between the pedestal 11c of the key sheet 11 and the bottom 12a of the key top 12. At this time, the ultraviolet light UV irradiated on the inner wall surface of the tapered hole portion 21d of the through hole 21c is reflected by the inner wall surface and collected on the straight hole portion 21e.

  The inclination angle of the tapered hole portion 21d with respect to the direction along the axis of the inner wall surface is preferably greater than 0 ° and less than or equal to 60 °, particularly from 15 ° to 45 °, as will be apparent from a reference example described later. Is preferred.

  The key sheet 11 and the key top 12 are bonded to each other by curing the adhesive 13 with ultraviolet rays UV using such a light collecting action. Then, after the adhesive 13 is cured, the adhesive 13 is taken out from the bonding jig 20 and the manufacture of the pushbutton switch cover member 10 is finished.

  If the key top 12 is bonded to the key sheet 11 by using the bonding jig 20 as described above, the first split jig 21 that holds the key sheet 11 and the second that holds the key top 12. The key top 12 is placed on the pedestal 11c of the key sheet 11 with high accuracy because the key top 12 is placed on the pedestal 11c that is the key top placement position of the key sheet 11 with the split jig 22 positioned and opposed to each other. It can arrange and stick.

  The first split jig 21 is provided with a through hole 21c, and the first split jig 21 and the second split jig 22 are opposed to each other, and ultraviolet rays are incident from the through hole 21c. Then, the ultraviolet curable adhesive 13 interposed between the key sheet 11 and the key top 12 is cured, so that the key sheet 11 and the key top 12 are attached by the first and second dividing jigs 21 and 22. The adhesive 13 can be cured while being held at a predetermined position. Therefore, it is possible to prevent the positional deviation between the key sheet 11 and the key top 12 and bond them with excellent positional accuracy.

  Further, since the UV curable adhesive 13 is applied to the pedestal portion 11c of the key sheet 11 in a state where the back surface of the pedestal portion 11c of the key sheet 11 is supported by the support surface 23c of the support jig 23, when applying, In addition, the key sheet 11 is not deformed, and a desired amount of the ultraviolet curable adhesive 13 is easily applied.

  That is, when the adhesive 13 is applied without using the support jig 23, as shown in FIG. 8, the transfer jig 25 is opposed (i), and the transfer pin 26 is lowered to adhere to the pedestal portion 11c. When the agent 13 is applied (ii), the pedestal portion 11c is deformed by elasticity, so that the transfer pin 26 is not sufficiently pressed against the pedestal portion 11c. For this reason, the adhesive 13 may remain on the transfer pin 26 after the transfer (iii), and the application amount of the adhesive 13 may vary.

  However, if the adhesive 13 is applied as shown in FIG. 7 using the support jig 23, the transfer pin 26 can be sufficiently pressed against the pedestal portion 11c, so that a desired amount of the adhesive 13 can be easily applied. .

  Further, when the support jig 23 is used in this way, even when the first division jig 21 and the second division jig 22 face each other, the elastic deformation of the base portion 11c of the key sheet 11 is prevented. Therefore, the bottom portion 12a of the key top 12 can easily be securely adhered to the pedestal portion 11c.

  Moreover, since the ultraviolet light is irradiated with the support jig 23 detached from the through hole 21c, the back surface of the pedestal portion 11c of the key sheet 11 is exposed and easily irradiated with the ultraviolet light incident from the through hole 21c. The adhesive can be cured.

  In addition, the bonding jig 20 has the tapered hole portion 21d having an inner wall surface that is inclined so that the through hole 21c contracts from the back surface toward the key sheet 11 side, so that the inner wall surface of the through hole 21c is inclined. It is possible to collect ultraviolet rays irradiated from the outside, and it is possible to improve productivity by reducing the irradiation amount from the light source of ultraviolet rays and shortening the irradiation time.

  Further, in the bonding jig 20, the support convex portion 23a of the support jig 23 is disposed in the through hole 21c of the first dividing jig 21 to support the key sheet 11, and the support convex portion 23a and the through hole 21c. Since there is a gap between which the key sheet 11 can be sucked, the through-hole 21c can be used for irradiating ultraviolet rays and can be used for sucking and fixing the key sheet 11. Therefore, it is easy to simplify the configuration of the bonding jig.

  The first embodiment of the present invention can be modified as appropriate within the scope of the present invention. For example, in the above description, the example in which the first split jig 21 is provided with the through hole 21c has been described. When the printing layer 14 is not provided on the bottom portion 12a of the Twelve and the adhesive 13 can be irradiated through the key top 12 when irradiated with ultraviolet rays, the key top of the second split jig 22 is exactly the same as described above. A through hole can be provided in the holding portion 22a.

  In the first embodiment of the present invention, an example in which one key top 12 is bonded to the key sheet 11 has been described. However, a plurality of key tops 12 can be bonded to the key sheet 11. In that case, the second split jig of the bonding jig 20 is provided with a plurality of key top holding portions 22 a for holding the key tops 12, and the first split jig 21 has the key tops 12. The through holes 21c may be provided at positions corresponding to the respective pedestal portions 11c, and the support jig 23 may be provided with a plurality of support convex portions 23a corresponding to the respective through holes 21c.

  Furthermore, in the above description, the example in which the pedestal portion 11c is provided as the key top arrangement position of the key sheet 11 is described. However, there is no particular limitation, and the surface of the key sheet 11 that faces the key top 12 is flat. Even if configured, the present invention can be applied without any difference.

  Moreover, although the example which apply | coats the adhesive agent 13 using the transfer jig | tool 25 was demonstrated above, the adhesive agent 13 can also be apply | coated by another method.

  For example, as shown in FIG. 12, the adhesive 13 can be applied using a screen 34a. In that case, the key sheet 11 is held by the key sheet holding portion 21a of the first dividing jig 21 and the support convex portion 23a of the support jig 23, and the screen 34a is arranged at a predetermined position (i). It is also possible to apply the adhesive 13 by printing the adhesive 13 on the base portion 11c of the key sheet 11 using the squeegee 34b from above 34a (ii) and moving the squeegee 34b by a predetermined amount.

Even in such a case, by using the support jig 23, the elastic deformation of the key sheet 11 can be prevented and the desired amount of the adhesive 13 can be easily applied as described above.
[Embodiment 2 of the Invention]

  FIG. 13 shows a second embodiment of the present invention.

  In the second embodiment of the present invention, the structure of the support jig 23 of the bonding jig 20 is different from that of the first embodiment of the invention, and the others are the same as in the first embodiment.

  In this support jig 23, the support convex part 35 is a support convex part main body 35a as a support jig main body disposed in the through hole 21c of the first split jig 21, and the central part of the support convex part main body 35a. A support hole 35b provided so as to penetrate the support jig 23, a press part 35d received in the storage hole 35b and slidably disposed along the storage hole 35b, and a support for the press part 35d A compression spring 35e is provided as an elastic member disposed in the accommodation hole 35b so as to be biased toward the surface 35c, and a fixing screw 35f that supports the compression spring 35e.

  In the support jig 23, a flat support surface 35c corresponding to the back side of the key top arrangement position 11f of the key sheet 11 is provided on the top of the support convex body 35a, and a key sheet is provided at the center thereof. The diameter-reducing portion 35g of the accommodation hole 35b is open to a size that can accommodate the eleven contact mounting portions 11d.

  The pressing portion 35d has a distal end portion inserted into the reduced diameter portion 35g from the back surface side, and the distal end portion is pressed from the support surface 35c side, thereby resisting the urging force of the compression spring 35e. It is configured to move to the back side.

  In such an adhesive jig 20, when the key sheet 11 is held by the key sheet holding part 21a of the first split jig 21, the contact attaching part 11d of the key sheet 11 is compressed by the tip part of the pressing part 35d. It is pressed by the urging force of the spring 35e, and is arranged in a state where the key top arrangement position 11f of the key sheet 11 bulges outward.

  Further, when the adhesive 13 is applied to the key top arrangement position 11f of the key sheet 11, when the transfer pin 26 of the transfer jig 25 is pressed against the key sheet 11, the key sheet 11 is pressed, and the contact mounting portion 11d The pressing portion 35d is pressed, and the pressing portion 35d moves to the back side against the urging force of the compression spring 35e. Thereby, the contact attachment portion 11d of the key sheet 11 is accommodated in the reduced diameter portion 35g of the accommodation hole 35b, and the key top arrangement position 11f of the key sheet 11 is formed on the support surface 35c as indicated by the virtual line 11x in the drawing. It is definitely supported. Therefore, a desired amount of adhesive 13 can be applied as in the first embodiment of the invention.

  After the adhesive 13 is applied, as shown by the solid line in the figure, the key top placement position 11f of the key sheet 11 is again swelled outward.

  When the first split jig 21 and the second split jig 22 are made to face each other and the bottom portion 12a of the key top 12 is brought into close contact with the key sheet 11, the key sheet 11 and the key top 12 are gradually moved. First, the most bulging center portion of the bulging key top arrangement position 11f comes into contact with the bottom portion 12a of the key top 12. When further approaching, the pressing portion 35d is pressed by the contact mounting portion 11d, the pressing portion 35d moves to the back side against the urging force of the compression spring 35e, and the contact mounting portion 11d is reduced in diameter 35g of the accommodation hole 35b. Gradually housed. Therefore, the bulging key top arrangement position 11f can be brought into close contact with the bottom 12a of the key top 12 sequentially while being gradually and flatly deformed from the central side to the peripheral side.

  In this manner, when the key top arrangement position 11f of the key sheet 11 is brought into close contact with the bottom 12a of the key top 12 from the center side, bubbles are unlikely to remain in the adhesive 13 between the key sheet 11 and the key top 12. The adhesive strength can be easily secured, and the appearance quality and the like are easily secured.

  In the second embodiment, the example in which the compression spring 35e is used to bias the pressing portion 35d toward the support surface 35c has been described. However, the key top arrangement of the key sheet 11 can be achieved using other means. It is also possible to bulge and deform the position 11f. For example, the pressing portion 35d can be configured to be advanced and retracted by a motor, and the key top arrangement position 11f can be interlocked so as to be deformed flat when the adhesive 13 is applied or when the key top 12 is in close contact.

Examples will be described below.
[Example 1]

  Using a polycarbonate resin (Caliver 301-22, trade name, manufactured by Sumitomo Dow Co., Ltd.), injection molding is performed with a key top mold 16 as shown in FIG. 3A, and printing shown in FIG. With the jig 17, numbers, letters, and the like were printed on the back surface of the bottom 12 a of the key top 12 with ultraviolet curable ink (Reicure PF4200, trade name, manufactured by Jujo Chemical Co., Ltd.) with a thickness of 10 μm.

Then, after drying at an integrated light quantity of 500 mJ / cm ^{2 with} an ultraviolet curing metal halide lamp D bulb (trade name, manufactured by Fusion UV Systems Japan Co., Ltd.), excess portions such as runners and gates are removed, and key tops 12 was obtained.

On the other hand, a raw material consisting of 100 parts by weight of silicone compound DY32-6014U (trade name, manufactured by Toray Dow Corning Co., Ltd.) and 0.5 parts by weight of a crosslinking agent RC-8 (trade name, manufactured by Toray Dow Corning Co., Ltd.) Using a key sheet mold 15 as shown in FIG. 2 (a), compression molding is performed under conditions of a molding temperature of 180 ° C., a molding time of 5 minutes, and a molding pressure of 180 kg / cm ^2. A molded body of a key sheet 11 made of silicone rubber having a thickness of 11b and a thickness of 0.5 mm was obtained, and this was dried at a drying temperature of 200 ° C. for a drying time of 60 minutes. Removed.

Then, on the surface of the pedestal portion 11c on the upper surface of the molded body of the key sheet 11, in a batch type ultraviolet cleaning furnace VUM-3073-B (trade name, manufactured by Oak Manufacturing Co., Ltd.), 184.9 nm and 253.7 nm The key sheet 11 was obtained by irradiating the ultraviolet rays of a wavelength on the conditions of 1200 mJ / cm < ² >, and performing an ultraviolet irradiation process.

  Next, the key top 12 and the key sheet 11 prepared in this way were placed on an adhesive jig 20 as shown in FIGS. Here, the key sheet 11 is held by the key sheet holding portion 21a of the first dividing jig 21 in a state where the support jig 23 is combined with the first dividing jig 21, and the inside of the key sheet 11 from the suction hole 23e. By sucking air, the key sheet 11 was sucked and fixed from the gap between the through hole 21c and the support convex portion 23a.

  Further, the key top 12 was held by the key top holding portion 22a of the second dividing jig 22, and the key top 12 was sucked and fixed by the suction hole 22c.

  And, on the surface of the pedestal part 11c of the key sheet 11 fixed by the first dividing jig 21 and the support jig 23, the ultraviolet curable adhesive ThreeBond 3042H (manufactured by ThreeBond Co., Ltd., (Product name) 100 parts by weight of silane coupling agent KBM-603 (manufactured by Shin-Etsu Chemical Co., Ltd., trade name) 0.5 parts by weight was blended and transferred by a transfer jig 25 and applied.

  Thereafter, the bottom portion 12a of the key top 12 is disposed at the position of the pedestal portion 11c of the key sheet 11 by causing the first dividing jig 21 and the support jig 23 and the second dividing jig 22 to face each other. did.

And by detaching the support jig 23 from the first split jig 21, the through hole 21c is opened, and from the back side of the first split jig 21, with an ultraviolet irradiation conveyor as shown in FIG. Irradiation with ultraviolet rays of 300 to 450 nm wavelength (metal halide lamp, 120 W / cm series, M015-L312, manufactured by Eye Graphics Co., Ltd., trade name) from the base surface under the condition of 2000 mJ / cm ² , ultraviolet curable type The key sheet 11 and the key top 12 were bonded by curing the adhesive.

As a result, the high-quality pushbutton switch cover member 10 could be manufactured efficiently.
[Examples 2 to 5]

  Next, except that the key sheet 11 and the key top 12 are brought into close contact with each other using a different bonding jig 20, the cover member 10 for a push button switch is manufactured in the same manner as in the first embodiment, and the key sheet 11 and the key top are manufactured. No. 12 was compared with bubbles generated. The adhesive 13 was applied by applying the same amount in advance.

  In Example 2, as shown in the upper part of FIG. 14A, the bonding jig 20 that does not use the support jig 23 of the first embodiment of the present invention was used.

  In Example 3, as shown in the upper part of FIG. 14B, the bonding jig shown in Embodiment 1 of the present invention was used.

  In Example 4, as shown in the upper part of FIG. 14C, the support surface 23 c of the support jig 23 according to Embodiment 1 of the present invention has a recess corresponding to the contact mounting portion 11 d on the back side of the key sheet 11. The bonding jig 20 using the support jig 23 having no flat shape and a flat support surface 23c was used.

  In Example 5, as shown in the upper part of FIG. 14D, the bonding jig 20 having the support jig 23 according to the second embodiment of the present invention was used.

  In these Examples 2 to 5, when a large number of push button switch cover members 10 were manufactured, the key sheet 11 and the key top 12 were uniformly bonded by the adhesive 13 over the entire arrangement position. In addition to the member 10, a part of the adhesive 13 in which bubbles 13a were generated was included.

  Therefore, in each example, the pushbutton switch cover member 20 in which the bubbles 13a were generated was selected, and the position and size of the bubbles 13a generated in the adhesive 13 from the back side of the key sheet 11 were observed. The results are shown in the lower part of (a) to (d) of FIG. In the figure, the shape of the key top 12 and the adhesive 13 and the shape of the bubbles 13a which are visually recognized through the key sheet 11 are schematically shown by solid lines.

  As a result, in Example 2, as shown in the lower part of FIG. 14A, a large bubble 13a was generated in a wide range between the key sheet 11 and the key top 12 as compared with the other examples. Was included.

  In Example 3, as shown in the lower part of FIG. 14 (b), bubbles were generated on the center side corresponding to the contact attachment portion 11 d between the key sheet 11 and the key top 12.

  In Example 3, as shown in the lower part of FIG. 14C, relatively small bubbles 13 a were generated on the peripheral edge side between the key sheet 11 and the key top 12.

In Example 4, as shown in the lower part of FIG. 14 (d), no bubble was found between the key sheet 11 and the key top 12.
[Reference example]

  Next, the relationship between the inclination angle of the inner wall surface of the tapered hole portion 21d of the first split jig 21 and the amount of irradiated ultraviolet light and the irradiation time during ultraviolet irradiation was measured.

  As shown in FIGS. 15 (a) and 15 (b), an ultraviolet light irradiation device 30 shown in FIG. A jig 40 provided with a through hole 40c corresponding to the through hole 21c of the first split jig 21 was placed on it, and the integrated light quantity of the ultraviolet irradiation device 30 was measured. This measurement was performed by changing the inclination angle θ of the inner wall surface of the tapered hole portion 40d and the conveyance speed in various ways.

  The ultraviolet irradiation device 30 is an ultraviolet irradiation conveyor Mini grandage (trade name, manufactured by Eye Graphics), and the ultraviolet lamp 32 is a metal halide lamp, 120 W / cm series, M015-L312 (trade name, manufactured by Eye Graphics Co., Ltd.) The length between the entrance and exit of the irradiation unit was 400 mm. The light meter was UVPF-36 (trade name, manufactured by Eye Graphics).

  On the other hand, the jig 40 placed on the light meter is a 40 mm × 40 mm square plate with a thickness of 5 mm, the length L1 of the tapered hole portion 41d is 4 mm, and the inner diameter D of the straight hole portion 40e is 12 mm. The thickness L2 was 1 mm. Then, five types of 0 ° (straight hole shape), 15 °, 30 °, 45 °, and 60 ° were prepared as the angle θ with respect to the axial direction of the inner wall surface of the tapered hole portion 41d.

As a result, Table 1 shows the integrated light quantity obtained from the angle θ of the tapered hole and the conveyance speed.

  As is apparent from the results in Table 1, the integrated light amount increases from 0 ° in the range where the angle θ of the tapered hole portion 41d is greater than 0 ° and up to 60 °. In particular, in the range of 15 ° or more and 45 ° or less, the integrated light amount increases about 1.3 times.

It is sectional drawing of the cover member for pushbutton switches manufactured by Embodiment 1 of this invention. (A) is sectional drawing of the key sheet metal mold | die which shape | molds the key sheet of the cover member for pushbutton switches concerning Embodiment 1, (b) is sectional drawing of the molded object of the key sheet obtained by it, (c) FIG. 3 is a cross-sectional view of a key sheet that has been subjected to ultraviolet treatment. (A) is sectional drawing of the keytop metal mold | die which shape | molds the keytop of the cover member for pushbutton switches which concerns on the same Embodiment 1, (b) is the state which attached the keytop obtained by it to the printing jig. It is sectional drawing shown. It is sectional drawing which shows the 1st division | segmentation jig | tool and support jig | tool of the adhesion jig | tool 20 of the cover member for pushbutton switches which concerns on the same Embodiment 1. FIG. It is sectional drawing which shows the 2nd division | segmentation jig | tool of the adhesion jig | tool 20 of the cover member for pushbutton switches which concerns on the same Embodiment 1. FIG. It is sectional drawing of the adhesion jig | tool 20 of the cover member for pushbutton switches which concerns on the same Embodiment 1. FIG. It is sectional drawing which shows the application | coating process of the adhesive agent using the support jig | tool which concerns on the same Embodiment 1. FIG. It is sectional drawing which shows the application | coating process of the adhesive agent when not using the support jig | tool which concerns on the same Embodiment 1. FIG. It is sectional drawing which shows the 1st and 2nd division | segmentation jig | tool of the adhesion jig | tool 20 of the cover member for pushbutton switches which concerns on the same Embodiment 1. FIG. It is a schematic sectional drawing of the ultraviolet irradiation device concerning the Embodiment 1. It is an expanded sectional view which shows the through-hole periphery of the 1st and 2nd division | segmentation jig | tool of the adhesion jig | tool 20 of the cover member for pushbutton switches which concerns on the same Embodiment 1. FIG. It is sectional drawing which shows the other application | coating process of the adhesive agent concerning the first embodiment. It is a principal part expanded sectional view of the support jig which concerns on Embodiment 2 of this invention. It is a schematic sectional drawing which shows the result of having observed the structure of the adhesion jig | tool which concerns on Example 2 thru | or 5, and the cover member for pushbutton switches obtained by Example 2 thru | or 5 from the back side. The jig | tool which concerns on a reference example is shown, (a) is a top view, (b) is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cover member for pushbutton switches 11 Key sheet 11c Base part 12 Key top 12a Bottom part 13 Adhesive 20 Adhesive jig 21 First division jig 21a Key sheet holding part 21c Through hole 21d Taper hole part 21e Straight hole part 21g Positioning hole 21h Positioning pin 22 Second division jig 22a Key top holding part 22b Positioning hole 23 Support jig 23a Support convex part 23b Support base part 23d Positioning pin 23d

Claims (5)

Holding the cover base material and the key top bonded to the cover base material on each facing surface side of the first split jig and the second split jig that can be positioned and opposed to each other;
By making each of the opposing surfaces face each other, the key top is arranged at a predetermined key top arrangement position of the cover base material, and a photoreactive adhesive is interposed between the cover base material and the key top. ,
A cover for a pushbutton switch by irradiating light from the outside and reacting the photoreactive adhesive with the light transmitted through the cover base or the key top, thereby bonding the key top to the cover base. A method for manufacturing a member,
It said to hold Rutotomoni the cover substrate provided with the first or second divided jig holes at positions corresponding to the key top position of
A support jig is detachably disposed in the through hole, and the back surface of the key top arrangement position of the cover base is supported by the support jig, and the key jig is disposed at the key top arrangement position of the cover base. While applying a photoreactive adhesive, the first split jig and the second split jig are opposed to each other,
For a pushbutton switch, wherein the light is made incident from the through-hole to react with the photoreactive adhesive by irradiating the light with the support jig being detached from the through-hole. Manufacturing method of cover member. Comprising first and second splitting jigs having opposing surfaces that are positioned to oppose each other;
The opposing surface of the first split jig is provided with a cover base material holding portion that holds the cover base material in a predetermined position, and the opposing surface of the second split jig has a key top Is provided with a key top holding part for holding the
A through-hole penetrating one of the first and second split jigs is opened in the holding portion of one of the first and second split jigs ,
The bonding jig for a pushbutton switch cover member, wherein the through hole is a hole having an inner wall surface that is inclined so as to shrink from the back side toward the cover base material side . Comprising first and second splitting jigs having opposing surfaces that are positioned to oppose each other;
The opposing surface of the first split jig is provided with a cover base material holding portion that holds the cover base material in a predetermined position, and the opposing surface of the second split jig has a key top Is provided with a key top holding part for holding the
In the cover base material holding part of the first split jig, a through hole penetrating the first split jig is opened,
The first split jig includes a support jig that is detachably disposed in the through hole and supports the cover base material . The first split jig includes the through hole and is configured to suck and hold the cover base material. The support jig sucks the cover base material between the through hole. The bonding jig for a pushbutton switch cover member according to claim 3 , wherein the bonding jig has a possible gap. The support jig is disposed in the through-hole, the support jig main body having a central portion opened, and the support jig main body is disposed in the central portion of the support jig main body and is biased toward the cover base by the elastic member. A pressing portion,
Bonding jig of the cover member for push button switch according to claim 3 or 4, characterized in that the pressing portion is configured to protrude the center portion of the position corresponding to the through hole of the cover base .

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