JP4992561B2 - In-mold mold, touch panel intermediate manufacturing method, touch panel intermediate and touch panel - Google Patents

Description

  The present invention relates to an intermediate for a touch panel configured by bonding a transparent conductive film on one surface of a substrate, a touch panel including the intermediate for the touch panel, and an in-mold gold configured to be capable of manufacturing the intermediate for the touch panel. TECHNICAL FIELD The present invention relates to a touch panel intermediate manufacturing method for manufacturing a mold and its touch panel intermediate.

  As this type of in-mold mold, an in-mold mold disclosed in Japanese Patent Application Laid-Open No. 2004-152221 is known. This in-mold mold includes a movable mold and a fixed mold, and is configured to be able to manufacture a touch panel substrate by in-mold molding. In this in-mold mold, both molds are joined with a transfer film (in-mold film) inserted into the cavity, and a resin material is injected from the gate into the cavity in that state. Thus, the touch panel substrate is molded, and the transparent electrode film (transparent conductive film) of the in-mold film is transferred (bonded) to the touch panel substrate.

In this case, the touch panel substrate manufactured by the in-mold mold is used for a resistive film type touch panel, for example. Specifically, a pair of touch panel substrates are juxtaposed with a transparent conductive film facing each other with a dot spacer in between, and the edges of both touch panel substrates in that state are joined together to form a resistive film type touch panel. Produced. In this type of resistive film type touch panel, when a touch operation is performed on one surface of both touch panel substrates with a stylus pen or the like, the touched part comes into contact with the other touch panel substrate, and the resistance at that time The value changes. For this reason, it is possible to make this touch panel function as an operation unit by detecting the change in the resistance value and specifying the touch position.
JP 2004-152221 A (page 3-4, FIG. 1)

  However, the above-described in-mold mold has the following problems. That is, in the above-mentioned resistive film type touch panel using the touch panel substrate molded by this in-mold mold, the touch-operated part is slightly recessed from the other parts, so Newton rings are generated in the recessed part. There is a problem that the visibility of an image displayed on the far side is lowered. In this case, for example, as in the transparent composite material disclosed in Japanese Patent Application Laid-Open No. 2005-18726, a fine ridge portion (striated uneven portion) having a triangular cross section and a height of about 0.1 μm to 10 μm is used. A configuration is also conceivable in which fine interference fringes (Newton rings) are formed on the transparent conductive film so as not to affect image recognition. However, an in-mold film used for in-mold molding is generally configured by forming a transparent conductive film on the surface of a resinous base film having a thickness of about 50 μm. For this reason, the above-mentioned transparent composite material having fine ridges is provided on the molding surface (cavity surface) of the above-described in-mold mold with a fine stripe-shaped uneven section having a triangular cross section. Even if it is going to be used for in-mold molding, the base film becomes a cushioning material and the shape of the irregularities formed on the in-mold mold is not accurately traced, but the desired irregularities are formed on the transparent conductive film of the touch panel substrate It becomes difficult to do.

  The present invention has been made in view of such problems, and has improved an in-mold mold and a touch panel intermediate manufacturing method capable of manufacturing a touch panel intermediate capable of improving visibility, and improved visibility. The main object is to provide an intermediate for a touch panel and a touch panel.

  In order to achieve the above object, the in-mold mold according to the present invention is configured to be capable of forming a cavity for molding an intermediate substrate for a touch panel in a state where an in-mold film on which a transparent conductive film is formed is sandwiched. The mold for in-mold is configured to be capable of manufacturing the touch panel intermediate by molding the substrate by injecting resin into the cavity and bonding the transparent conductive film to one surface of the substrate. A plurality of cavity surfaces forming the one of the cavity surfaces constituting the cavity are formed in a plane that is recessed from the reference surface of the cavity surface and whose bottom is parallel or substantially parallel to the reference surface. And a plurality of streaks that protrude from the reference plane and whose top is parallel or substantially parallel to the reference plane Uneven portion surface connecting the bottom and the top is constituted by the inclined surface, respectively with the convex portion are arranged alternately is formed. It should be noted that the “slope” may be curved as long as the effect of the invention described later (ensurement of the height required as the height from the bottom to the top of the uneven portion on the cavity surface) is achieved. is there.

  In this case, it is possible to form the concavo-convex portions with the formation pitches of the concave portions being equal to each other and the formation pitches of the convex portions being equal to each other.

  Moreover, the said uneven | corrugated | grooved part can be comprised so that each width | variety along the said reference plane of the said bottom part, the said top part, and the said slope may become equal mutually.

  Moreover, the intermediate body manufacturing method for touch panels which concerns on this invention inject | pours resin with respect to the cavity of the in-mold metal mold | die in the state which pinched | interposed the film for in-molds in which the transparent conductive film was formed. A touch panel intermediate manufacturing method for manufacturing a touch panel intermediate by forming a substrate and bonding the transparent conductive film to one surface of the substrate, the bottom of which is recessed from the reference surface and the reference surface A plurality of streak-like recesses formed on a plane parallel to or substantially parallel to the plurality of streak-like projections protruding from the reference plane and having a top portion formed on a plane parallel or substantially parallel to the reference plane Are formed in the cavity surface on which the one surface is formed, and an uneven portion in which a surface connecting the bottom portion and the top portion is formed by a slope is formed. Wherein the tee resin injection to the producing intermediates for the touch panel.

  Moreover, the intermediate body for touchscreens which concerns on this invention is an intermediate body for touchscreens provided with the plate-shaped board | substrate and the transparent conductive film bonded by the in-mold shaping | molding on the one surface in the said board | substrate, The transparent conductive film has a plurality of streak-shaped concave portions that are recessed from the reference surface of the transparent conductive film and whose bottom is formed in a plane parallel or substantially parallel to the reference surface and projecting from the reference surface. Convex and convexities in which a plurality of streaky convex portions whose top portions are formed in a plane parallel or substantially parallel to the reference surface are alternately arranged, and the surfaces connecting the bottom portions and the top portions are each formed by slopes The part is formed.

  In addition, a touch panel according to the present invention includes the above-described intermediate body for a touch panel and a touch side electrode in which a transparent conductive film is formed on one surface of a transparent sheet, and each of the intermediate body for the touch panel and the touch side electrode The transparent conductive film is opposed to each other and the touch panel intermediate and the touch side electrode are arranged side by side with a spacer interposed therebetween.

  In the in-mold mold and the touch panel intermediate manufacturing method according to the present invention, a plurality of streak-like concave portions and convex portions, each having a bottom portion and a top portion formed in a plane parallel or substantially parallel to the reference plane, are alternately arranged. In addition, a resin is injected into a cavity formed by a cavity surface in which concave and convex portions each having a slope formed on the surface connecting the bottom and the top are formed to manufacture an intermediate for a touch panel. Therefore, according to the in-mold mold and the touch panel intermediate manufacturing method, unlike the conventional mold in which an uneven portion having a triangular cross section is formed on the cavity surface without having a flat surface, it has elasticity. Even if the base film of the in-mold film does not completely adhere to the entire surface of the concavo-convex part, the base film can be reliably adhered to at least the bottom part of the concave part and the top part of the convex part. For this reason, the height from the bottom part of the uneven part in a metal mold | die to the top part and the height from the bottom part of the uneven part in a transparent conductive film to the top part can be formed in the same height. As a result, according to this mold and the method for manufacturing an intermediate for a touch panel, the height from the bottom to the top is used to generate fine interference fringes for avoiding the generation of interference fringes that affect image recognition. As a result of ensuring the required height as a reliable, it is possible to manufacture an intermediate for a touch panel in which an image or the like can be visually recognized sufficiently clearly.

  In addition, according to the in-mold mold of the present invention, the formation pitch of each recess is equal to each other and the formation pitch of each recess is equal to each other. Concave and convex portions that are equal to each other and have the same pitch for forming each convex portion can be formed on the transparent conductive film of the intermediate for touch panel. For this reason, it is possible to reliably avoid a situation in which the user feels uncomfortable that the concave and convex portions of the concave and convex portions formed on the transparent conductive film appear to be, for example, random patterns due to the different formation pitches. Can do.

  In addition, according to the in-mold mold according to the present invention, the width of the bottom, the top, and the slope is formed by forming the concave and convex portions having the same width along the reference surfaces of the bottom, the top, and the slope on the cavity surface. Irregularities having the same value can be formed on the transparent conductive film. For this reason, it is possible to reliably prevent the inconvenience that the image displayed on the back side (display content) is visually recognized so that the distortion varies depending on the location due to the difference in the widths. In addition, the uneven portions can be made sufficiently inconspicuous by making the above-mentioned widths equal to each other and making the formation pitches of the concave portions and the convex portions narrow. Further, by making the above widths equal to each other and the formation pitches of the concave and convex portions to be narrow, fine interference fringes (brightness and darkness) generated by the concave and convex portions of the transparent conductive film when the touch operation is performed on the touch panel. ) Can be narrowed to such an extent that it occurs only within the contour line of the dent of the touch panel generated by the touch operation (contained within the contour line). For this reason, the fine interference fringes can be made inconspicuous to such an extent that they can hardly be visually recognized.

  Further, according to the touch panel intermediate and the touch panel according to the present invention, the bottom portion and the top portion have a plurality of streak-shaped concave portions and convex portions formed in planes parallel to the reference plane, respectively, and the bottom portion and the top portion are provided. By forming the concave and convex portions each of which the connecting surfaces are composed of slopes on the transparent conductive film, it is possible to generate fine interference fringes to avoid the generation of interference fringes that affect image recognition. The required height can be ensured reliably. Therefore, according to this intermediate body for touch panels and a touch panel, the image etc. which are displayed on the back | inner side of a touch panel in the state attached to the attachment target body can be visually recognized sufficiently clearly.

  Hereinafter, the best mode of an in-mold die, a touch panel intermediate manufacturing method, a touch panel intermediate, and a touch panel according to the present invention will be described with reference to the accompanying drawings.

  First, the configuration of the touch panel 1 will be described with reference to the drawings.

  The touch panel 1 shown in FIG. 1 is a resistive film type touch panel that is attached to the display surface side of a display device (attachment object) such as a liquid crystal display panel and functions as a touch-type operation unit. 2a, an upper electrode 2b, a plurality of dot spacers 3 and connection terminals 4. The lower electrode 2a corresponds to an intermediate for a touch panel according to the present invention, and includes a substrate 11 and a transparent conductive film 12 (see FIG. 2). The lower electrode 2a is an in-mold mold 102 (hereinafter simply referred to as “mold”). 102 ”).

  As shown in FIG. 1, the substrate 11 is formed in a rectangular plate shape as an example, and has a high total light transmittance (high transparency) resin (as an example) in the cavity 102 a (see FIG. 7) of the mold 102. , Acrylic resin, polycarbonate, and special olefin resin such as Arton (registered trademark)). Further, as shown in FIG. 2, a gate mark 11d generated when resin is injected from the gate 102c (see FIG. 7) to the cavity 102a of the mold 102 is formed on one end surface 11c of the substrate 11. Yes. Specifically, as shown in FIG. 2, the gate mark 11d is formed in a portion of the end surface 11c located on the outer surface 11b side with respect to the inner surface 11a of the substrate 11.

  The transparent conductive film 12 is a thin film having transparency and conductivity, and is formed on an in-mold film 131 (see FIG. 9), and is bonded to the inner surface 11a of the substrate 11 during in-mold molding. (See FIG. 2). Further, as shown in the figure, the entire surface of the transparent conductive film 12 has a shape of the concavo-convex portion 141 on the cavity surface 102f (see FIG. 8) of the mold 102 during in-mold molding using the mold 102 described later. 2 is transferred (traced) to form an uneven portion 21 in which fine streak-like concave portions 22 and convex portions 23 directed alternately toward the front side and the back side of the paper surface in FIG. 2 are alternately arranged. ing. In this case, a configuration in which the uneven portion 21 is formed in a part of the transparent conductive film 12 can be employed. Moreover, the recessed part 22 is a surface parallel to the outer surface 11b of the board | substrate 11, and the reference surface of the transparent conductive film 12 which passes along the depth direction (height direction) center of the uneven | corrugated | grooved part 21, as shown in the figure. The bottom portion 22 a is recessed from the reference surface 24 and is parallel (or substantially parallel) to the reference surface 24.

  Further, as shown in FIG. 2, the convex portion 23 is formed so as to protrude from the reference surface 24 and the top portion 23 a is parallel (or substantially parallel) to the reference surface 24. Further, the surfaces connecting the bottom portion 22a and the top portion 23a (connected to both the portions 22a and 23a) are each constituted by an inclined surface 25. The uneven portion 21 is configured such that the height (depth) L1 from the bottom portion 22a to the top portion 23a is in the range of 0.5 μm or more and 3 μm or less. Furthermore, the concavo-convex portion 21 has widths W1, W2, and W3 that are equal to each other along the reference surface 24 of the bottom portion 22a, the top portion 23a, and the inclined surface 25 (as an example, in a range of 0.05 mm to 0.4 mm). It is comprised so that. That is, the concave and convex portions 21 are formed such that the formation pitches of the concave portions 22 are equal to each other and the formation pitches of the convex portions 23 are equal to each other.

  The upper electrode 2b corresponds to the touch side electrode in the present invention, and is configured to include a transparent sheet 31 and a transparent conductive film 32 as shown in FIG. The transparent sheet 31 is formed of a resin having high total light transmittance (for example, PET (polyethylene terephthalate)). Further, the touch surface of the transparent sheet 31 (the upper surface in the figure) is subjected to hard coat processing for preventing scratches and antireflection processing for preventing reflection. The transparent conductive film 32 is formed into a thin film on one surface (the lower surface in the figure) of the transparent sheet 31 by a material having transparency and conductivity used for forming the transparent conductive film 12 (this material will be described later). Is formed.

  The dot spacers 3 are formed of a resin having elasticity and transparency, and are arranged at equal intervals between the upper electrode 2b and the lower electrode 2a, as shown in FIGS. It is sandwiched between the electrodes 2a. In this case, when a touch operation is performed on a predetermined portion of the touch surface of the upper electrode 2b and the touch portion is pressed toward the lower electrode 2a, the touch portion contacts the lower electrode 2a.

  As shown in FIG. 1, the connection terminal 4 is attached to, for example, the outer peripheral edge portions of the lower electrode 2a and the upper electrode 2b arranged opposite to each other, and is connected to the transparent conductive films 12 and 32 of both the electrodes 2a and 2b. The Further, the connection terminal 4 is configured so that a connector of the connection cable can be inserted, and connects the external circuit such as the control unit in the attachment target body and the transparent conductive films 12 and 32 via the connection cable.

  Next, the configuration of the manufacturing apparatus 101 will be described with reference to the drawings.

  As shown in FIG. 3, the manufacturing apparatus 101 includes a mold 102, an in-mold film moving apparatus 103, and an injection molding machine 104. The mold 102 is a mold that can manufacture the lower electrode 2a of the touch panel 1 by in-mold molding according to the touch panel intermediate manufacturing method according to the present invention, and includes a stationary mold (upper mold) 111 and a moving mold. A mold (lower mold) 121 is provided. In addition, the mold 102 holds the in-mold film 131 moved by the in-mold film moving device 103 (see FIG. 7), and the main body 113 of the fixed-side mold 111 and the movable-side mold 121. The main body 123 is configured to be joinable.

  As shown in FIG. 4, the fixed-side mold 111 includes a base portion 112 and a main body portion 113. The base portion 112 is formed in a plate shape and is configured to be attachable to a fixed side attachment portion (not shown) of the injection molding machine 104. The main body 113 is fixed to the base 112 and is bonded to the main body 123 of the moving mold 121 with the in-mold film 131 sandwiched therebetween as shown in FIG. A cavity 102 a to be molded is formed together with the main body 123.

  In this case, as shown in FIGS. 6 and 7, a cavity surface (cavity surface 102d in FIGS. 6 and 7) that molds the end surface 11c (see FIGS. 1 and 2) of the substrate 11 among the cavity surfaces that form the cavity 102a. ) Is provided with a gate 102c for injecting the fluid resin from the injection molding machine 104 fed through the sprue 102b into the cavity 102a. Specifically, the gate 102c is a cavity surface that molds the outer surface 11b of the substrate 11 relative to the portion of the cavity surface 102d where the in-mold film 131 sandwiched between the main body 113 and the main body 123 is located (in both figures). A portion (for example, the length direction of the cavity surface 102d) located within the width of the in-mold film 131 on the cavity surface 102e) side and along the length direction (vertical direction in FIG. 4) of the cavity surface 102d. At the center). Therefore, as shown in FIG. 7, due to the pressure of the resin injected from the gate 102c into the cavity 102a, the in-mold film 131 faces the cavity surface 102e and the cavity surface 102f (the cavity for molding the inner surface 11a of the substrate 11). Surface) side.

  As shown in FIG. 5, the moving-side mold 121 includes a base portion 122, a main body portion 123, a spacer block 124, and an eject plate 125. The base part 122 is formed in a plate shape and is configured to be attachable to a moving side attaching part (not shown) in the injection molding machine 104. The main body portion 123 is fixed to the base portion 122 via the spacer block 124, and forms a cavity 102 a together with the main body portion 113 of the fixed mold 111.

  Further, as shown in FIG. 8, the entire surface of the cavity surface 102f that forms the inner surface 11a of the cavity surfaces constituting the cavity 102a has a fine line-like shape toward the front side and the back side of the paper surface in FIG. An uneven portion 141 having a concave portion 142 and a convex portion 143 is formed. In this case, a configuration in which the uneven portion 141 is formed on a part of the cavity surface 102f can be employed. Further, as shown in the figure, the concave portion 142 is a surface parallel to the cavity surface 102e of the main body portion 113 in a state where the main body portions 113 and 123 are joined, and the depth direction (height direction) of the concave and convex portion 141. ) That is recessed with respect to the reference surface 144 (see the same figure) of the cavity surface 102f passing through the center of the cavity surface 102f and that the bottom 142a is parallel (or substantially parallel) to the reference surface 144. Further, as shown in the figure, the convex portion 143 is formed such that it protrudes from the reference surface 144 and the top portion 143a thereof is parallel (or substantially parallel) to the reference surface 144. In addition, the surfaces connecting the bottom portion 142a and the top portion 143a (connected to both the portions 142a and 143a) are respectively formed by inclined surfaces 145.

  In this case, the uneven portion 141 is configured such that the height (depth) L11 from the bottom portion 142a to the top portion 143a is in the range of 0.5 μm or more and 3 μm or less. Moreover, the uneven | corrugated | grooved part 141 is the width | variety where each width W11, W12, W13 along the reference plane 144 of the bottom part 142a, the top part 143a, and the inclined surface 145 is mutually equal (in the range of 0.05 mm or more and 0.4 mm or less as an example). It is comprised so that. In other words, the concavo-convex portion 141 is formed such that the formation pitch of the concave portions 142 is equal to each other and the formation pitch of the convex portions 143 is equal to each other.

  The eject plate 125 is disposed between the base portion 122 and the main body portion 123, and is moved between the base portion 122 and the main body portion 123 by the injection molding machine 104. It protrudes in front of the part 123.

  As shown in FIG. 3, the in-mold film moving device 103 is inserted between the fixed mold 111 and the movable mold 121 by a predetermined length for each in-mold molding (one shot). The mold film 131 is moved. Here, as shown in FIG. 9, the in-mold film 131 has a thickness of about 15 μm to 100 μm having a release layer (not shown) on the surface, and has an appropriate flexibility and elasticity (for example, PET or A base film 132 made of PP (polypropylene) and a thin film having a thickness of about 0.5 μm to 5 μm formed of indium oxide such as tin-doped indium oxide (ITO) on the surface of the base film 132 with a release layer interposed therebetween The transparent conductive film 12 formed in a shape and the adhesive layer 134 formed on the surface of the transparent conductive film 12 are configured. The material constituting the transparent conductive film 12 is not limited to the above-mentioned indium oxide, but fine particles of tin oxide such as antimony-doped tin oxide (ATO) and fluorine-doped tin oxide (FTO), aluminum-doped zinc oxide (AZO) ) And other various materials having transparency and conductivity, such as cadmium oxide.

  As an example, the injection molding machine 104 includes a fixed side mounting portion, a moving side mounting portion, a mold clamping mechanism, an injection mechanism, an ejection mechanism (none of which are shown), and the like.

  Next, the process of manufacturing the lower electrode 2a and the touch panel 1 using the manufacturing apparatus 101 (the mold 102) according to the touch panel intermediate manufacturing method according to the present invention will be described with reference to the drawings.

  First, as shown in FIG. 3, the fixed side mold 111 and the movable side mold 121 of the mold 102 are respectively attached to the fixed side mounting part and the moving side mounting part outside the figure in the injection molding machine 104. Next, the in-mold film 131 is set on the in-mold film moving device 103 so that the adhesive layer 134 faces the cavity surface 102e of the fixed mold 111, and the in-mold film moving device 103 is operated. . At this time, the in-mold film moving device 103 moves the in-mold film 131 by a predetermined length between the fixed mold 111 and the movable mold 121 of the mold 102. Subsequently, the injection molding machine 104 is operated. At this time, the mold clamping mechanism of the injection molding machine 104 moves the moving side mounting portion toward the fixed side mounting portion, so that the main body portion 113 and the moving side mold of the fixed side mold 111 are moved as shown in FIG. The main body 123 of the mold 121 is bonded to each other with the in-mold film 131 interposed therebetween.

  Next, the injection mechanism of the injection molding machine 104 pumps the resin in a fluid state. At this time, as shown in FIG. 7, the resin pumped from the injection molding machine 104 is injected into the cavity 102a from the gate 102c through the sprue 102b. In this case, in this mold 102, as shown in the figure, the cavity surface 102d is closer to the cavity surface 102e than the portion where the in-mold film 131 is located and is along the length direction of the cavity surface 102d. A gate 102 c is provided at a position located within the width of the in-mold film 131. For this reason, the resin injected from the gate 102c into the cavity 102a is filled in the cavity 102a while pressing the in-mold film 131 against the cavity surface 102f, and the in-mold is sandwiched between the resin and the cavity surface 102f. The adhesive layer 134 of the film 131 is in close contact with the resin filled in the cavity 102a by the pressure of the resin.

  In this case, in this mold 102, as shown in FIG. 8, since the uneven portion 141 is formed on the cavity surface 102f, the uneven portion 141 is formed on the in-mold film 131 sandwiched between the cavity surface 102f. As a result of transferring (tracing) the shape (uneven shape), the uneven portion 21 having fine streak-like concave portions 22 and convex portions 23 is formed in the transparent conductive film 12 of the in-mold film 131.

  Here, as described above, the base film 132 of the in-mold film 131 is formed of a resin having appropriate flexibility and elasticity. For this reason, as shown in FIG. 11, in the conventional mold 302 in which the concave and convex portion 341 having a triangular cross section is formed on the cavity surface 302f without having a flat surface, the base film 132 has elasticity. In some cases, the base film 132 is not completely adhered to all the surfaces of the concave portion 342 and the convex portion 343 constituting the concave and convex portion 341, and a gap may be generated between the bottom portion 342 a and the base film 132. That is, the base film 132 serves as a buffer material, and the shape of the concavo-convex portion 341 is not accurately transferred (traced) to the transparent conductive film 12, but the bottom portion 22 a to the top portion 23 a of the concavo-convex portion 21 formed on the transparent conductive film 12. The height (depth) L12 may be lower than the height L11 from the bottom 342a to the top 343a of the mold 302 by the gap between the bottom 342a and the base film 132. As a result, the height required for the height from the bottom portion 22a to the top portion 23a (the height described above) to generate fine interference fringes for avoiding the generation of interference fringes that affect image recognition. It may be difficult to ensure L11).

  On the other hand, in the mold 102 according to the present invention, the concavo-convex portion 141 includes a concave portion 142 in which the bottom portion 142 a is formed in a plane parallel to the reference surface 144 and a plane in which the top portion 143 a is parallel to the reference surface 144. And a slope 145 connecting the bottom 142a and the top 143a. Therefore, even if the base film 132 having elasticity does not completely adhere to the entire surface of the uneven portion 141, as shown in FIG. 10, at least the bottom portion 142a of the concave portion 142 and the top portion 143a of the convex portion 143 have a base The film 132 adheres securely. As a result, the height L11 from the bottom 142a to the top 143a of the uneven portion 141 in the mold 102 and the height L1 from the bottom 22a to the top 23a of the uneven portion 21 in the transparent conductive film 12 are formed to be the same height. The That is, by using the mold 102, the uneven portion 21 has a height L1 from the bottom portion 22a to the top portion 23a longer than a height L12 from the bottom portion 22a to the top portion 23a when the conventional mold 302 is used. Is formed. Accordingly, the height (height L11) required as the height from the bottom portion 22a to the top portion 23a to generate fine interference fringes for avoiding the generation of interference fringes that affect image recognition. It is possible to ensure.

  Subsequently, after a predetermined cooling time has elapsed, the fixed side mold 111 and the movable side mold are moved by moving the movable side mounting part in a direction in which the mold clamping mechanism of the injection molding machine 104 moves away from the fixed side mounting part. The joint with 121 is released, and the moving-side mold 121 is separated from the fixed-side mold 111. At this time, the molded product (that is, the substrate 11) molded by the solidification of the resin is pulled away from the fixed mold 111 together with the moving mold 121. Next, the ejection mechanism of the injection molding machine 104 moves the ejection plate 125 of the movable mold 121 to the main body portion 123 side, so that an unillustrated eject pin protrudes in front of the main body portion 123 and is molded. 11 is removed from the moving mold 121. In this case, since the adhesive layer 134 is in close contact with (attached to) the substrate 11, the in-mold film 131 is taken out from the moving-side mold 121 together with the substrate 11.

  Subsequently, the base film 132 of the in-mold film 131 is peeled off from the substrate 11. In this case, since the transparent conductive film 12 is stuck to the inner surface 11a of the substrate 11 by the adhesive layer 134, the base film 132 is easily peeled off from the transparent conductive film 12, and the transparent conductive film 12 is It is bonded to 11a. Thereby, manufacture of the lower electrode 2a comprised by the board | substrate 11 and the transparent conductive film 12 bonded by the inner surface 11a of the board | substrate 11 is completed.

  Next, the upper electrode 2b is manufactured. In this case, first, tin-doped indium oxide (ITO) as a material for forming the transparent conductive film is applied to one surface of the transparent sheet 31 formed of PET, for example, so that the transparent conductive film 32 is formed on one surface of the transparent sheet 31. Form. Next, the other surface (touch surface) of the transparent sheet 31 is subjected to hard coat processing and antireflection processing. Subsequently, the transparent sheet 31 after the formation of the transparent conductive film 32 and the above processing is finished is cut into a predetermined size (substantially the same size as the lower electrode 2a). Thereby, manufacture of the upper electrode 2b is completed.

  Next, the transparent conductive film 12 of the lower electrode 2a and the transparent conductive film 32 of the upper electrode 2b are opposed to each other, and the dot spacer 3 is sandwiched between the electrodes 2a and 2b, and the outer peripheral edges of the electrodes 2a and 2b in that state. Are bonded using an adhesive or the like. Subsequently, the connection terminals 4 are attached to the outer peripheral edges of the electrodes 2a and 2b, the transparent conductive film 12 bonded to the inner surface 11a of the substrate 11 in the lower electrode 2a, and the transparent conductive film 32 of the upper electrode 2b. And the connection terminal 4 are connected. Thereby, the touch panel 1 is completed.

  In this case, in the touch panel 1, as described above, the lower electrode 2 a is in-molded using the mold 102, so that a fine interference fringe is generated as the height from the bottom 22 a to the top 23 a. An uneven portion 21 having a necessary height is formed on the transparent conductive film 12. For this reason, it is possible to reliably avoid the generation of interference fringes that affect image recognition. Therefore, in this touch panel 1, the image displayed on the back side of the touch panel 1 in a state of being attached to the attachment target body can be viewed with sufficient clarity.

  As described above, in the mold 102 and the touch panel intermediate manufacturing method, the bottom 142a and the top 143a are formed with a plurality of streak-like recesses 142 formed on planes parallel (or substantially parallel) to the reference plane 144, respectively. The resin is injected into the cavity 102a formed by the cavity surface 102f in which the projections 143 are alternately arranged and the surface connecting the bottom 142a and the top 143a is formed with the projections and depressions 141 each having the slope 145. The lower electrode 2a is manufactured. Therefore, according to the mold 102 and the intermediate body manufacturing method for a touch panel, unlike the conventional mold 302 in which an uneven portion having a triangular cross section is formed on the cavity surface 302f without having a flat surface, the mold has elasticity. Even if the base film 132 of the in-mold film 131 does not completely adhere to the entire surface of the concave and convex portion 141, the base film 132 is securely adhered to at least the bottom portion 142a of the concave portion 142 and the top portion 143a of the convex portion 143. be able to. For this reason, the height from the bottom 142a to the top 143a of the uneven portion 141 in the mold 102 and the height from the bottom 22a to the top 23a of the uneven portion 21 in the transparent conductive film 12 can be formed at the same height. As a result, according to the mold 102 and the touch panel intermediate manufacturing method, from the bottom 22a to the top 23a to generate fine interference fringes for avoiding the generation of interference fringes that affect image recognition. As a result of ensuring the required height L1 as the height of the lower electrode 2a, it is possible to manufacture the lower electrode 2a in which an image or the like can be visually recognized sufficiently clearly.

  In addition, according to the mold 102 and the touch panel intermediate manufacturing method, the concave / convex portions 141 are configured such that the formation pitches of the concave portions 142 are equal to each other and the formation pitches of the convex portions 143 are equal to each other. By forming the lower electrode 2a using the mold 102, the concave and convex portions 21 having the same formation pitch of the concave portions 22 and the same formation pitch of the convex portions 23 can be formed on the lower electrode 2a. For this reason, it is possible to reliably avoid a situation in which the user feels uncomfortable that the concave portions 22 and the convex portions 23 appear to be, for example, random patterns due to the different formation pitches.

  Further, according to the mold 102 and the touch panel intermediate manufacturing method, the uneven portion 141 is formed so that the widths W11, W12, and W13 along the reference surface 144 of the bottom portion 142a, the top portion 143a, and the inclined surface 145 are equal to each other. By forming and forming the lower electrode 2a using the mold 102, the concave and convex portions 21 having the same widths W1, W2, and W3 of the bottom portion 22a, the top portion 23a, and the inclined surface 25 can be formed on the transparent conductive film 12. it can. For this reason, it is possible to reliably prevent the inconvenience that the image displayed on the back side (display content) is visually recognized so that the distortion changes depending on the location due to the difference between the widths W11, W12, and W13. Can do. Further, the widths W11, W12, and W13 are equal to each other, and the concave and convex portions 21 formed on the transparent conductive film 12 of the lower electrode 2a are not sufficiently conspicuous by making the formation pitches of the concave portions 142 and the convex portions 143 narrow. can do. Furthermore, by setting the widths W11, W12, and W13 to be equal to each other and the formation pitches of the concave portions 142 and the convex portions 143 to be narrow, the concave and convex portions 21 of the transparent conductive film 12 when the touch panel 1 is touched. The distance between the fine interference fringes (brightness and darkness) generated by the above can be narrowed to such an extent that it is generated only within the contour line of the dent of the touch panel 1 generated by the touch operation (contained in the contour line). For this reason, the fine interference fringes can be made inconspicuous to such an extent that they can hardly be visually recognized.

  Further, according to the touch panel 1 and the lower electrode 2a for the touch panel 1, the bottom portion 22a and the top portion 23a have a plurality of streak-like concave portions 22 and convex portions 23 formed on a plane parallel to the reference plane 24, respectively. In addition, since the concave and convex portions 21 each having the slope 25 are formed on the surface connecting the bottom portion 22a and the top portion 23a are formed on the transparent conductive film 12, a fine pattern for avoiding the generation of interference fringes that affect image recognition. In order to generate the interference fringes, the height L1 required as the height from the bottom 22a to the top 23a can be reliably ensured. Therefore, according to the touch panel 1 and the lower electrode 2a for the touch panel 1, an image or the like displayed on the back side of the touch panel 1 in a state where the touch panel 1 is attached to the attachment target body can be viewed sufficiently clearly.

  In addition, this invention is not limited to said structure. For example, the example in which the substrate 11 is formed in a rectangular plate shape has been described above, but the present invention is not limited thereto, and the substrate 11 can be formed in an arbitrary plate shape. Further, the lengths of the widths W1 to W3 of the bottom portion 22a, the top portion 23a and the inclined surface 25 in the transparent conductive film 12, and the lengths of the widths W11 to W13 of the bottom portion 142a, the top portion 143a and the inclined surface 145 in the mold 102 are arbitrarily defined. Can do. The height L1 from the bottom 22a to the top 23a of the uneven portion 21 formed on the transparent conductive film 12, and the height from the bottom 142a to the top 143a of the uneven portion 141 formed on the cavity surface 102f of the mold 102 are set to L11. Although the above has been described with respect to the example in which the height is within the range of 0.5 μm or more and 3 μm or less, these heights can be arbitrarily defined. Further, the widths W1, W2, and W3 along the reference surface 24 of the bottom portion 22a, the top portion 23a, and the slope 25, and the widths W11, W12, and W13 along the reference surface 144 of the bottom portion 142a, the top portion 143a, and the slope 145, respectively. Although the above has been described with respect to the example in which the thickness is in the range of 0.05 mm or more and 0.4 mm or less, the length of these widths can be arbitrarily defined. Further, the example in which the uneven portion 21 is configured so that the widths W1, W2, and W3 are equal to each other and the example in which the uneven portion 141 is configured so that the widths W11, W12, and W13 are equal to each other have been described above. , W2 and W3 can be different from each other, and widths W11, W12 and W13 can be different from each other.

1 is a perspective view illustrating a configuration of a touch panel 1. FIG. 2 is a side view of a lower electrode 2a, an upper electrode 2b, and a dot spacer 3 as viewed from the direction of arrow A in FIG. 1 is a configuration diagram showing a configuration of a manufacturing apparatus 101. FIG. 3 is a perspective view of a fixed side mold 111. FIG. 3 is a perspective view of a moving side mold 121. FIG. 2 is a cross-sectional view of a mold 102. FIG. It is sectional drawing of the state which joined the stationary side metal mold | die 111 and the movement side metal mold | die 121. FIG. It is sectional drawing which shows the structure of the cavity surface 102f in the main-body part 123 of the movement side metal mold | die 121. FIG. It is a block diagram which shows the structure of the film 131 for in-mold. 2 is a cross-sectional view of the mold 102, the in-mold film 131, and the substrate 11 in a state where in-mold molding is performed using the mold 102. FIG. It is sectional drawing of the metal mold | die 302, the film 131 for in-mold, and the board | substrate 11 in the state which is performing the in-mold shaping | molding using the conventional metal mold | die 302. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Touch panel 2a Lower electrode 2b Upper electrode 3 Dot spacer 11 Substrate 12 Transparent conductive film 31 Transparent sheet 32 Transparent conductive film 102 Mold 102a, 102d-102f Cavity surface 131 In-mold film 141 Convex part 142 Concave part 142a Bottom part 143 Convex part 143a Top 144 Reference plane 145 Slope W1-W3, W11-W13 Width

Claims (6)

A cavity for forming a substrate for an intermediate for a touch panel is formed in a state where an in-mold film on which a transparent conductive film is formed is sandwiched, and the substrate is molded by injection of resin into the cavity and the substrate A mold for in-mold configured to bond the transparent conductive film on one side to produce the touch panel intermediate,
The cavity surface forming the one of the cavity surfaces constituting the cavity has a bottom that is recessed from the reference surface of the cavity surface and is parallel or substantially parallel to the reference surface. A plurality of streak-like recesses and a plurality of streak-like projections that protrude from the reference surface and whose top is formed in a plane parallel or substantially parallel to the reference surface are alternately arranged in parallel, and the bottom part. And a mold for in-mold, in which concave and convex portions each having a slope formed on the surface connecting the top portions are formed.   The in-mold mold according to claim 1, wherein the concave and convex portions are formed such that the formation pitches of the concave portions are equal to each other and the formation pitches of the convex portions are equal to each other.   3. The in-mold mold according to claim 2, wherein the concavo-convex portion is configured such that widths of the bottom portion, the top portion, and the inclined surface along the reference surface are equal to each other. A resin is injected into a cavity of an in-mold mold in a state where an in-mold film having a transparent conductive film is sandwiched therebetween to form a substrate for an intermediate for a touch panel, and the transparent conductive film is formed on one surface of the substrate. Is an intermediate manufacturing method for a touch panel, in which an intermediate for touch panel is manufactured by bonding
A plurality of streak-like recesses that are recessed from the reference surface and whose bottom is formed in a plane parallel or substantially parallel to the reference surface, and projecting from the reference surface, the top is parallel or substantially to the reference surface A plurality of line-shaped convex portions formed in parallel planes are alternately arranged side by side, and an uneven portion in which a surface connecting the bottom portion and the top portion is composed of an inclined surface is formed on the cavity surface forming the one surface A touch panel intermediate manufacturing method for manufacturing the touch panel intermediate by injecting the resin into the cavity. An intermediate for a touch panel comprising a plate-shaped substrate and a transparent conductive film bonded to one surface of the substrate by in-mold molding,
The transparent conductive film of the substrate includes a plurality of streak-shaped concave portions that are recessed from the reference surface of the transparent conductive film and whose bottom is parallel or substantially parallel to the reference surface and the reference surface. And a plurality of line-shaped convex portions whose top portions are formed in a plane parallel or substantially parallel to the reference plane, and the surfaces connecting the bottom portion and the top portion are slopes, respectively. The intermediate body for touchscreens in which the comprised uneven | corrugated | grooved part is formed.   An intermediate for a touch panel according to claim 5 and a touch-side electrode having a transparent conductive film formed on one surface of a transparent sheet, and the transparent conductive films in the intermediate for touch panel and the touch-side electrode are connected to each other. A touch panel in which the intermediate body for a touch panel and the touch-side electrode are arranged side by side with the spacer interposed therebetween.

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