JP5264839B2 - Sensor sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor sheet which hardly corrodes a wiring part positioned at a curved part of a substrate. <P>SOLUTION: A sensor sheet comprises: a sheet-like substrate 2 which has a shape in which one surface in the thickness direction is bent inward and has a first surface Q1 and a second surface Q2 which oppose each other; a first electrode 3 disposed on the first surface Q1; a second electrode 4 disposed on the second surface Q2; a plate-like dielectric body 5 arranged closely to each of the first electrode 3 and the second electrode 4; and a wiring part 6 which is connected to each of the first electrode 3 and the second electrode 4 and electrically connected to a detection circuit and in which at least a part of the sheet-like substrate 2 is disposed on the curved part 2a. The wiring part 6 comprises a conductor layer 8 disposed on the curved part 2a and a covering layer 9 for covering the conductor layer 8 between the conductor layer 8 and the curved part 2a. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a sensor sheet for performing an input operation on an electronic device.

  2. Description of the Related Art Conventionally, as an input device for inputting to an electronic device, a touch panel device that detects the position of an input body by bringing an input body such as a stylus pen or a user's finger close to or in contact with the input body is known. .

  Patent Document 1 discloses a transparent touch panel in which a plastic transparent substrate is bent inward or outward to form a two-layer substrate having a gap. In this transparent touch panel, a transparent support such as an adhesive is disposed in a gap between two layers of substrates, and a transparent conductor is disposed opposite to each of the two layers of substrates with the transparent support interposed therebetween. In Patent Document 1, an external lead electrode for connection to an external circuit is provided on the transparent conductor, and a lead-out line (wiring) is provided to collect the connection positions of the external lead electrode and the external circuit in one place. Providing is disclosed.

JP 2007-272644 A

  However, in the transparent touch panel described in Patent Document 1, when wiring is provided and the connection positions of the external extraction electrode and the external circuit are integrated in one place, the wiring is also routed to a curved portion where the plastic transparent substrate is bent. . In this case, since the wiring is not covered with the transparent support at the curved portion of the plastic substrate, the wiring can come into contact with the air or water droplets can adhere to the wiring. If the wiring touches the air or drops of water adhere to the wiring, the wiring may corrode and the sensitivity of detecting the input body may be reduced or erroneous detection may occur.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a sensor sheet in which a wiring portion located at a curved portion of a substrate is unlikely to corrode.

In order to solve the above problems, the present invention proposes the following means.
The sensor sheet of the present invention is used for a touch panel that detects the proximity of the input body and the position of the input body when the input body approaches, and is electrically connected to a detection circuit that detects a change in capacitance. A sensor sheet having a first surface and a second surface facing each other in a shape in which one surface in the thickness direction is bent inward, and is disposed on the first surface A first electrode; a second electrode disposed on the second surface; a dielectric provided in close contact with each of the first electrode and the second electrode; the first electrode; A wiring portion that is connected to each of the two electrodes and is electrically connected to the detection circuit, and at least a part of the wiring portion is disposed on a curved portion where the sheet-like substrate is curved, and the wiring portion includes: A conductor layer disposed on the curved portion; And having a coating layer covering the conductive layer between said curved portion in close contact with the conductive layer.

  The conductor layer is electrically connected to the first electrode and electrically connected to the detection circuit; and the conductor layer is electrically connected to the second electrode and electrically connected to the detection circuit. A second connection terminal to be connected, and the first connection terminal and the second connection terminal are arranged together on either the first surface or the second surface of the sheet-like substrate. Preferably it is.

Moreover, it is preferable that the thickness of the coating layer is smaller than ½ of the thickness of the dielectric.
Moreover, it is preferable that the said coating layer consists of a resist laminated | stacked on the said conductor layer.

  In the sensor sheet of the present invention, since the coating layer that covers the conductor layer is provided on the curved portion of the sheet-like substrate, the wiring portion located on the curved portion of the sheet-like substrate is unlikely to corrode.

(A) is a front view which shows a touchscreen apparatus provided with the sensor sheet of one Embodiment of this invention, (B) is a top view of the sensor sheet, (C) is a bottom view of the sensor sheet. (A) is a development view of the sensor sheet, and (B) is an enlarged view of a connecting portion in the sensor sheet. It is explanatory drawing for demonstrating arrangement | positioning with the 1st electrode and 2nd electrode in the sensor sheet | seat. It is sectional drawing in the XX line of FIG. 1 (A). It is a figure which shows the structure of the modification of the sensor sheet, (A) is a development view of the sensor sheet, (B) is a cross-sectional view of the sensor sheet of this modification at the same position as the XX line of FIG. It is. It is a figure which shows the structure of the other modified example of the sensor sheet, (A) is a front view of the sensor sheet of the modified example, and (B) is a bottom view of the sensor sheet. It is an expanded view of the sensor sheet | seat of the modification. FIG. 11 is a diagram illustrating a configuration of still another modified example of the sensor sheet, in which (A) is a front view of the sensor sheet of the modified example, (B) is a development view of the sensor sheet, and (C) is a side view of the sensor sheet. FIG. It is a figure which shows the structure of the other modified example of the sensor sheet, (A) is a front view of the sensor sheet of the modified example, (B) is a right side view of the sensor sheet of the modified example, and (C) is the same. It is an expanded view of the sensor sheet of a modification.

  A sensor sheet 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 by taking a touch panel device 100 including the sensor sheet 1 as an example. FIG. 1A is a front view showing a touch panel device 100 including the sensor sheet 1. FIG. 1B is a plan view of the sensor sheet 1. FIG. 1C is a bottom view of the sensor sheet 1. FIG. 2A is a development view of the sensor sheet 1. FIG. 2B is an enlarged view of the connection portion 1 b in the sensor sheet 1. FIG. 3 is an explanatory diagram for explaining the arrangement of the first electrode 3 and the second electrode 4 in the sensor sheet 1. FIG. 4 is a cross-sectional view taken along line XX in FIG.

  The touch panel device 100 is an input device for an operator of an electronic device or the like to perform an input operation on the electronic device or the like. The input operation performed on the touch panel device 100 is bringing the input body 101 made of a conductor close to or in contact with the sensor sheet 1 provided on the touch panel device 100 (see FIG. 1C). As the input body 101, a stylus pen or a user's finger can be used.

  As illustrated in FIG. 1A, the touch panel device 100 includes a sensor sheet 1 for receiving an input operation using the input body 101 and a detection circuit D that receives the input operation and detects the position of the input body 101.

As shown in FIGS. 1 (A) and 1 (B), the sensor sheet 1 includes a plate-shaped main body 1a and an outer periphery of the main body 1a formed integrally with the main body 1a when viewed from the thickness direction. A connecting portion 1b having a shape projecting from one place to the outside of the main body portion 1a. In the present embodiment, both the main body portion 1a and the connection portion 1b have flexibility.
The outer shape of the main body 1a when viewed from the thickness direction of the main body 1a is a quadrangle. Further, both surfaces in the thickness direction of the main body 1a are flat. Further, the outer shape of the main body 1a when the main body 1a is viewed from the side on which the connecting portion 1b is formed is a substantially oval shape. In this specification, the substantially oval shape is curved so that both short sides of a rectangle whose main body portion 1a has a short side direction is convex toward the outside in the long side direction of the rectangle. The curved shape is not limited to an arc, and may be any curved shape.
The shape of the connecting portion 1b is a quadrangle when viewed from the thickness direction of the main body portion 1a. In the present embodiment, the shape of the connecting portion 1b is a rectangular shape in which the length in the protruding direction protruding from the main body portion 1a is longer than the length in the direction orthogonal to the protruding direction. In the connecting portion 1b, conductor layers 8 of the wiring portion 6 described later are arranged in parallel with each other.

  As shown in FIG. 1C and FIG. 2A, the sensor sheet 1 includes a sheet-like substrate 2 and a plurality of first sheets formed on the sheet-like substrate 2 that extend in one direction and are aligned in parallel with each other. An electrode 3, a plurality of second electrodes 4 formed on the sheet-like substrate 2 and extending in a direction perpendicular to the direction in which each first electrode 3 extends, and formed on the sheet-like substrate 2, and the first electrode 3 and the second electrode 4 A support member 5 (dielectric) provided in close contact and a wiring portion 6 formed on the sheet-like substrate 2 are provided.

As shown in FIG. 1B, the sheet-like substrate 2 is a thin plate-like member bent at two curved portions 2a and 2b that are separated from each other. As for the shape of the sheet-like substrate 2, both ends are abutted at the center of the side (see FIG. 1 (A)) where the connecting portion 1b is formed in the outer periphery of the main body 1a when the main body 1a is viewed from the thickness direction. Shape. Furthermore, between the two curved portions 2a and 2b in the sheet-like substrate 2 is a plane parallel to each other.
As shown in FIG. 2A, in a state where the sheet-like substrate 2 is unfolded and flattened, the curved portions 2a and 2b are in the surface direction of the sheet-like substrate 2 and the sides where the connecting portions 1b are formed. It is a strip shape long in the direction orthogonal to The first electrode 3, the second electrode 4, and the wiring part 6 are all formed on one surface in the thickness direction of the sheet-like substrate 2.
As shown in FIG. 1C, in the state where the sensor sheet 1 is assembled, the sheet-like substrate 2 has a shape in which the surface on which the first electrode 3 and the second electrode 4 are formed is bent inward. ing. Further, in the sheet-like substrate 2, the surface on which the first electrode 3 is formed (first surface Q1) and the surface on which the second electrode 4 is formed (second surface Q2) face each other.
As a material for the sheet-like substrate 2, a flexible material can be employed. For example, the material of the sheet-like substrate 2 includes polyester, polypropylene, vinyl chloride, polyethylene, polyethylene terephthalate, polycarbonate, nylon (registered trademark), vinylon, acetate, polyamide, polyimide, polyacryl, polyvinyl chloride, and acrylic. A film made of a resin or the like can be used. In the present embodiment, polyethylene terephthalate is adopted as the material for the sheet-like substrate 2.

  The first electrode 3 is formed between the two curved portions 2a and 2b in a state where the sheet-like substrate 2 is developed. Each first electrode 3 has a plurality of electrode elements 3a connected to each other at the diagonal apexes when the contour shape when viewed from the thickness direction of the first electrode 3 is square. The electrode elements 3a are arranged in a line in each first electrode 3, and the shape of both ends of each first electrode 3 in which the electrode elements 3a are arranged in a line is a triangle with apexes directed to the electrode element 3a side. Shape. In the present embodiment, ten first electrodes 3 are provided, and the adjacent first electrodes 3 are arranged so that the apexes of the electrode elements 3a are adjacent to each other with a gap. In addition, a substantially square gap is formed between the first electrodes 3.

The second electrode 4 is formed at two locations on the opposite side to the first electrode 3 with the curved portion 2a interposed therebetween and on the opposite side with respect to the first electrode 3 with the curved portion 2b interposed therebetween. In the present embodiment, eight second electrodes 4 are provided, and four second electrodes 4 are arranged at two locations with the first electrode 3 interposed therebetween. Each second electrode 4 has a plurality of electrode elements 4a connected to each other at the diagonal apexes when the contour shape when viewed from the thickness direction of the second electrode 4 is square. The electrode elements 4a are arranged in a line in each second electrode 4, and the shape of both ends of each second electrode 4 in which the electrode elements 4a are arranged in a line is a triangle whose apexes are directed to the electrode element 4a side. Shape. The adjacent second electrodes 4 are arranged so that the apexes of the electrode elements 4a are adjacent to each other with a gap therebetween, and a substantially square gap is provided between the adjacent second electrodes 4.
As shown in FIG. 3, in the present embodiment, the first electrode 3 and the second electrode 4 are square-shaped spaces between the first electrodes 3 when viewed from the thickness direction of the main body 1 a. The electrode element 4a of the second electrode 4 is accommodated in the gap.
Moreover, as a material of the 1st electrode 3 and the 2nd electrode 4, metal materials, such as copper, gold | metal | money, silver, aluminum, can be selected suitably and can be employ | adopted. In the present embodiment, the first electrode 3 and the second electrode 4 are made of copper foil.

  As shown in FIG. 1B, the support member 5 is a thin plate member disposed between the first surface Q1 and the second surface Q2. As shown in FIG. 4, the support member 5 is made of a dielectric having an adhesive material on both sides, and is in close contact with the first electrode 3 and the second electrode 4 by the adhesive material. The support member 5 keeps the distance between the first electrode 3 and the second electrode 4 in the thickness direction of the main body 1a at a constant distance, and electrically insulates the first electrode 3 and the second electrode 4 from each other. I support it. Further, the first electrode 3 and the second electrode 4 are covered by the support member 5 between the first surface Q1 or the second surface Q2.

  As shown in FIGS. 2A and 4, the wiring portion 6 includes a conductor layer 8 provided on the sheet-like substrate 2 and a covering layer 9 that covers the conductor layer 8 in the curved portions 2 a and 2 b. .

The conductor layer 8 is a wiring pattern formed on the sheet-like substrate 2. The conductor layer 8 has a first conductor layer 8-1 connected to the first electrode 3 and a second conductor layer 8-2 connected to the second electrode 4.
One end of the first conductor layer 8-1 is connected to each first electrode 3, and the first conductor layer 8-1 is first in the bending portions 2a and 2b than the center lines L1-1 and L1-2 in the short direction of the bending portions 2a and 2b. The region extends to the connecting portion 1b along a rectangular outline formed by the plurality of first electrodes 3 through the region on the one electrode 3 side. Further, the first conductor layer 8-1 is aligned in parallel with each other in the connecting portion 1b and extends to the protruding end of the connecting portion 1b through the intermediate portion in the short direction of the connecting portion 1b. The other end of the first conductor layer 8-1 is disposed at the protruding end of the connection portion 1b, and is a first connection terminal 10-1 for electrical connection to the detection circuit D (FIG. 2B )reference).
One end of the second conductor layer 8-2 is connected to each second electrode 4, and extends to the connection portion 1b across the curved portions 2a and 2b. Furthermore, the second conductor layer 8-2 is aligned in parallel with the direction in which the first conductor layer 8-1 extends on both sides of the first conductor layer 8-1 in the connecting portion 1b and extends to the protruding end of the connecting portion 1b. It extends. The other end of the second conductor layer 8-2 is a second connection terminal 10-2 for electrical connection to the detection circuit D (see FIG. 2B).
In the sensor sheet 1 of the present embodiment, the first connection terminal 10-1 and the second connection terminal 10-2 are contact points in a connector for a flexible printed circuit board (FPC) or a flexible flat cable (FFC) at the protruding end of the connection portion. Arranged at equal intervals according to the pitch of the terminals.

  As materials for the first conductor layer 8-1 and the second conductor layer 8-2, metal materials such as copper, gold, silver, and aluminum can be appropriately selected and employed. In the present embodiment, the first conductor layer 8-1 and the second conductor layer 8-2 are made of the same copper foil as the material of the first electrode 3 and the second electrode 4. In this embodiment, the 1st electrode 3, the 2nd electrode 4, the 1st conductor layer 8-1, and the 2nd conductor layer 8-2 can be formed on the sheet-like board | substrate 2 collectively by an etching etc., for example. .

As shown in FIGS. 2A and 4, the covering layer 9 is disposed on the curved portions 2 a and 2 b on the surface of the sheet-like substrate 2 in the thickness direction on the side where the conductor layer 8 is formed. Has been. The covering layer 9 is formed of a resist laminated on the conductor layer 8 by, for example, screen printing. The thickness of the coating layer 9 is formed to be thinner than ½ of the thickness of the support member 5.
As shown in FIG. 4, in the present embodiment, a cavity C is formed by the coating layer 9 and the support member 5 in the inner portion of the curved portion 2 a. Although illustration is omitted, a similar cavity C is also formed in the curved portion 2b.
As shown in FIG. 4, the conductor layer 8-1 is located on the first surface Q1 side with respect to the second surface Q2 in the thickness direction of the sensor sheet 1 in the curved portion 2a.

  As the detection circuit D that can be connected to the sensor sheet 1 (see FIG. 1), a detection circuit that detects a change in capacitance between the sensor sheet 1 and the input body 101 can be appropriately employed. For example, as the detection circuit D, a detection circuit based on a self-capacitance system that detects a change in capacitance between the first electrode 3 and the second electrode 4 and the input body 101 can be employed. The detection circuit D may be based on a mutual capacitance method in which, for example, a high-frequency wireless signal is transmitted from the first electrode 3 and the high-frequency wireless signal transmitted from the first electrode 3 is received by the second electrode 4.

The operation of the touch panel device 100 configured as described above will be described focusing on the operation of the sensor sheet 1.
The touch panel device 100 is used, for example, by being attached to an image display area of a keyboard or a liquid crystal display device for performing key input. Such a keyboard and a liquid crystal display device may be used outdoors, for example, or in an environment with high humidity. In these cases, air, water droplets, or the like may enter the cavity C (see FIG. 4) in the curved portions 2a and 2b. In particular, water droplets may remain in the cavity C and not be discharged. In this case, when the water droplets contact the conductor layer 8, the conductor layer 8 may be corroded. However, since the coating layer 9 covering the conductor layer 8 is provided on the curved portions 2 a and 2 b, the water droplets are applied to the conductor layer 8. There is no contact. Thereby, compared with the case where the conductor layer 8 located in curved part 2a, 2b is exposed, the conductor layer 8 coat | covered with the coating layer 9 becomes difficult to corrode.

  In the sensor sheet 1, the first connection terminal 10-1 and the second connection terminal 10-2 (see FIG. 2B) of the connection portion 1b are electrically connected to the detection circuit D (see FIG. 1). Used. For example, when the sensor sheet 1 is connected to the self-capacitance type detection circuit D, the detection circuit D repeatedly outputs a drive signal to each of the first electrode 3 and the second electrode 4. Furthermore, the detection circuit D repeatedly detects the electrostatic capacitance in each first electrode 3 and each second electrode 4.

  When the input body 101 approaches the first electrode 3 and the second electrode 4, the capacitance between the input body 101 and the first electrode 3 and between the input body 101 and the second electrode 4 changes. Further, when the input body 101 is close to the conductor layer 8, the capacitance changes between the input body 101 and the conductor layer 8 according to the distance between the input body 101 and the input body 101. When the capacitance changes between the input body 101 and the conductor layer 8, noise is generated due to a change in capacitance between the first electrode 3 or the second electrode 4 and the input body 101.

  As shown in FIG. 4, in the sensor sheet 1 of the present embodiment, a cavity C is formed, and in the curved parts 2a and 2b, an air layer in the cavity C is provided between the conductor layer 8 and the input body 101. is there. On the other hand, a support member 5 made of a dielectric is disposed between the first surface Q1 and the second surface Q2. Thereby, since the sensitivity between the input body 101 and the conductor layer 8 is lower than that between the input body 101 and the second electrode 4, the above-described occurrence between the input body 101 and the conductor layer 8. Noise is suppressed.

As described above, according to the sensor sheet 1 of the present embodiment, the coating layer 9 that covers the conductor layer 8 is provided on the curved portions 2 a and 2 b of the sheet-like substrate 2. The wiring part 6 located in the parts 2a and 2b is hardly corroded.
Further, when the first connection terminal 10-1 and the second connection terminal 10-2 are both arranged on the first surface Q1 side, the conductor layer 8 connecting the first surface Q1 and the second surface Q2 is curved. Even if it arrange | positions to 2a, 2b, the wiring part 6 does not corrode easily.

  Further, the thickness of the covering layer 9 is thinner than ½ of the thickness of the support member 5, the cavity C is formed inside the curved portions 2 a and 2 b, and the conductor layer 8 is in the thickness direction of the sensor sheet 1. In this case, the noise is generated in the conductor layer 8 and the detection accuracy can be increased.

  In addition, since the covering layer 9 is made of a resist laminated on the conductor layer 8, air bubbles are mixed in as compared with the case where the conductor layer 8 is covered by attaching an insulating sheet on the sheet-like substrate 2. Can be suppressed. Thereby, it can further suppress that the conductor layer 8 corrodes.

  Further, when the covering layer 9 is formed of a resist, the covering layer 9 can be formed thinner than when an insulating sheet is stuck on the covering layer 9. Thereby, the sensor sheet 1 can be made thinner.

  The first electrode 3, the second electrode 4, and the wiring part 6 are all formed on one side in the thickness direction of the sheet-like substrate 2, and are formed only on one side in the thickness direction of the sheet-like substrate 2. Therefore, the sensor sheet 1 can be easily made.

(Modification 1)
Next, the sensor sheet 11 of the first modification of the present embodiment will be described with reference to FIGS. 5 (A) and 5 (B). 5A and 5B are diagrams showing the configuration of the sensor sheet 11. FIG. 5A is a development view of the sensor sheet 11, and FIG. 5B is a cross-sectional view of the sensor sheet 11 of the present modification at the same position as the line XX in FIG. is there.
As shown in FIGS. 5 (A) and 5 (B), the sensor sheet 11 of this modification includes the main body portion 11a and the connection portion 11b in the same manner as the main body portion 1a and the connection portion 1b described in the above embodiment. Have. The sensor sheet 11 includes a sheet substrate 12 having a shape different from that of the sheet substrate 2 described in the above embodiment.

  The line width and inter-wiring distance in the first conductor layer 8-1 provided on the sheet-like substrate 12 are the same as those in the above embodiment. The second electrode 4 is disposed at a position closer to the first electrode 3 side by 1/2 of the width in the short direction of the curved portions 2a and 2b than the position of the second electrode 4 in the sensor sheet 1 of the above-described embodiment. ing. The sheet-like substrate 12 is bent at the band-like curved portions 12a and 12b that are ½ of the width in the short direction of the curved portions 2a and 2b described in the above embodiment.

  Also in this modification, the wiring part 6 can be made difficult to corrode similarly to the above-described embodiment. Furthermore, in this modification, the width of the curved portions 12a and 12b in the sheet-like substrate 12 is narrower than the width of the curved portions 2a and 2b described in the above-described embodiment, so When the sensor sheet 11 is formed by bending at 12a and 12b, the sensor sheet 11 can be made smaller.

(Modification 2)
Next, a sensor sheet 21 according to Modification 2 of the present embodiment will be described with reference to FIGS. 6 (A), 6 (B), and 7. 6A and 6B are diagrams illustrating the configuration of the sensor sheet 21. FIG. 6A is a front view of the sensor sheet 21 according to the present modification, and FIG. 6B is a bottom view of the sensor sheet 21. FIG. 7 is a development view of the sensor sheet 21 of this modification.

As shown in FIGS. 6 (A), 6 (B), and 7, the sensor sheet 21 is plate-shaped and has a rectangular main body 21a when viewed from the thickness direction, and the main body 21a. And an integrally formed connection portion 21b.
Both surfaces in the thickness direction of the main body portion 21a are flat. Furthermore, when the main body portion 21a is viewed from the side where the connection portion 21b is formed, the contour shape of the main body portion 21a is substantially D-shaped. In the present specification, the substantially D shape means that one short side in a rectangle in which the thickness direction of the main body portion 21a is the short side direction is substantially linear, and the other short side is the long side direction of the rectangle. It is the shape curved so that it may become convex toward the outer side. The curved shape of the other short side described above is not limited to an arc, and may be any curved shape.
The connecting portion 21b is located at one position on the outer periphery of the main body portion 21a and from the vicinity of the corner of the main body portion 21a located on the other short side of the one short side and the other short side. Projects outward. The shape of the connecting portion 21b when viewed from the thickness direction of the main body portion 21a is a quadrangle.
The sensor sheet 21 includes a sheet-like substrate 22 having a shape different from that of the sheet-like substrates 2 and 12 described above.
The sheet-like substrate 22 is a thin plate-like member that is bent at one bending portion 22a. As shown in FIG. 7, the curved portion 22a is formed in a long strip shape in a direction perpendicular to the side where the connection portion 21b is formed in the main body portion 21a when the sheet substrate 22 is unfolded and flattened. Further, in the unfolded sheet-like substrate 22, the first electrode 3 and the second electrode 4 are respectively arranged on both sides of the connection 22 a with the connection portion 22 a interposed therebetween.

  In this modification, the conductor layer 8 located on the curved portion 22a of the sheet-like substrate 22 is covered with the coating layer 9, and the conductor layer 8 located on the opposite side of the curved portion 22a with the first electrode 3 interposed therebetween The support member 5 is in close contact. Although not shown in detail, the conductor layer 8 is coated so that air and water droplets do not enter when the support member 5 is in close contact with the conductor layer 8.

Even with such a configuration, the same effects as those of the sensor sheets 1 and 11 described in the above-described embodiment and Modification 1 are obtained. Moreover, since the 1st electrode 3 is collectively arrange | positioned at one place, it is sensor sheet 1, 11 of the above-mentioned embodiment and the modification 1 that aligns the 1st electrode 3 and the 2nd electrode 4 with sufficient precision. Easier than.
Moreover, in this modification, the curved part 22a of one place is provided, and since the coating layer 9 should just be formed in one place, the sensor sheet | seat 21 can be made still more easily.

(Modification 3)
Next, a sensor sheet 31 according to Modification 3 of the present embodiment will be described with reference to FIGS. 8A and 8B. 8A and 8B are diagrams illustrating the configuration of the sensor sheet 31, where FIG. 8A is a front view of the sensor sheet 31, FIG. 8B is a development view of the sensor sheet 31, and FIG. 8C is a side view of the sensor sheet 31.
The sensor sheet 31 of the present modification includes a sheet-like substrate 32 having a shape different from that of the sheet-like substrates 2, 12, and 22 described in the above-described embodiment, Modification 1 and Modification 2.

As shown in FIG. 8 (A), the sensor sheet 31 is a plate-like main body portion 31a having a shape different from that of the main body portion 1a described in the above-described embodiment, and when viewed from the thickness direction of the main body portion 31a. And a connecting portion 31b formed to project from the center portion of the short side to the outside of the main body portion 31a.
The shape of the main body portion 31a is different from the shape of the main body portion 1a described above in that the connecting portion with the connection portion 31b is a concave shape that is recessed inside the main body portion 31a.
As shown in FIG. 8A, the shape of the sheet-like substrate 32 is a shape bent in one direction at one curved portion 32a, and the first surface Q1 and the second surface Q2 face each other. . As shown in FIG. 8B, in the state in which the sheet-like substrate 32 is unfolded, the first surface Q1 and the second surface Q2 are arranged on both sides of the connection portion 1b so that the connection portion 1b is located therebetween. Yes.
Also in this modification, the coating layer 9 is laminated | stacked on the sheet-like board | substrate 2 in the curved part 32a in the shape of a belt | band | zone like the sensor sheet 1 of the above-mentioned embodiment. As a result, the second conductor layer 8-2 located at the curved portion 32 a in the second conductor layer 8-2 is covered with the covering layer 9.

  Also in this modification, it can suppress by the coating layer 9 that the conductor layer 8 located in the curved part 32a contacts air or a water droplet.

(Modification 4)
Next, a sensor sheet 41 according to Modification 4 of the present embodiment will be described with reference to FIGS. 9A, 9B, and 9C. 9A and 9B are diagrams illustrating the configuration of the sensor sheet 41, where FIG. 9A is a front view of the sensor sheet 41, FIG. 9B is a right side view of the sensor sheet 41, and FIG. 9C is a development view of the sensor sheet 41.
The sensor sheet 41 according to the present modification is obtained by bending the sheet-like substrate 32 at two more positions in the sensor sheet 31 according to the third modification described above.
As shown in FIG. 9A, the sensor sheet 41 is different in shape from the main body 31a of the sensor sheet 31 described in the above-described modification example 3, and as described in the above-described embodiment and modification examples 1 and 2. The main body 41a having a plate shape and a rectangular outer shape when viewed from the thickness direction and a part of the outer periphery when viewed from the thickness direction of the main body portion 41a are projected to connect the above-described modification 3. And a connecting portion 41b integrally formed in the same shape as the portion 31b.

As shown in FIG. 9B, the sheet-like substrate 32 has a curved portion 42a formed by folding the sheet-like substrate 32 into an M shape between the first surface Q1 and the second surface Q2. Thereby, the protrusion amount of the sheet-like board | substrate 32 located in the both sides of the connection part 1b can be made smaller than the sensor sheet 31 of the above-mentioned modification 3.
Moreover, in this modification, the thickness of the support member 5 is the thickness of two sheets of the sheet-like substrate 32, and the sensor sheet 41 is flat when the sheet-like substrate 32 is bent into an M shape. is there. In this modification, a space corresponding to the cavity C described in the above embodiment is not provided.

  In the present modification, the area when the sensor sheet 41 is viewed from the thickness direction can be made smaller than that of the sensor sheet 31 of the third modification.

As mentioned above, although embodiment of this invention was explained in full detail, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, the materials of the first electrode 3, the second electrode 4, and the conductor layer 8 may be other than the above-described metal materials. For example, a conductive material made of a transparent conductive polymer containing polythiophene, polyaniline, etc., or a light-transmitting thin film containing a metal oxide such as indium tin oxide (ITO), or metal particles, metal nanowires, Conductive ink containing carbon nanotubes can be used as the material for the first electrode 3, the second electrode 4, and the conductor layer 8.

  Further, the curved shapes in the curved portions 2a, 2b, 12a, 12b, 22a, 32a, and 42a are not limited to the shapes described above. For example, the sheet-like substrates 2, 12, 22, and 32 may be folded at bending lines that extend in the longitudinal direction of the curved portions within the curved portions. That is, each sheet-like substrate may be bent at a steep angle at each curved portion. Each sheet substrate may be folded twice or more in the same direction. For example, each sheet-like substrate may be folded in an L shape along two parallel fold lines extending in the longitudinal direction of each bending portion in each bending portion.

Further, in the above-described modification 1, the example in which the width in the short direction of the bending portions 12a and 12b is ½ of the width in the short direction of the bending portions 2a and 2b is shown. Is not limited to ½ of the width in the short direction of the curved portions 2a, 2b. That is, the width in the short direction of the curved portions 12a and 12b is not particularly limited as long as it is equal to or larger than the width that allows the conductor layer 8-1 to be disposed inside the curved portions 12a and 12b.
Moreover, the coating layer 9 does not need to cover all of the curved portions 2a, 2b, 12a, 12b, 22a, 32a, and 42a, and only needs to cover the conductor layer 8 located in these curved portions.

  Further, the constituent elements shown in the above-described embodiment and each modification can be combined as appropriate.

1, 11, 21, 31, 41 Sensor sheet 1a, 11a, 21a, 31a, 41a Main body 1b, 11b, 21b, 31b, 41b Connection part 2, 12, 22, 32 Sheet-like substrate 2a, 2b, 12a, 12b , 22a, 32a, 42a Curved portion 3 First electrode 4 Second electrode 5 Support member 6 Wiring portion 8 Conductive layer 9 Cover layer 10-1 First connection terminal 10-2 Second connection terminal 100 Touch panel device 101 Input body C Cavity Part D Detection circuit Q1 First side Q2 Second side

Claims (4)

A sensor sheet that is used in a touch panel that detects the proximity of the input body and the position of the input body when the input body approaches, and is electrically connected to a detection circuit that detects a change in capacitance. ,
A sheet-like substrate having a first surface and a second surface facing each other in a shape in which one surface in the thickness direction is bent inward;
A first electrode disposed on the first surface;
A second electrode disposed on the second surface;
A dielectric provided in close contact with each of the first electrode and the second electrode;
A wiring portion that is connected to each of the first electrode and the second electrode and is electrically connected to the detection circuit, and at least a part of the wiring portion is disposed in a curved portion where the sheet-like substrate is curved;
With
The wiring part is
A conductor layer disposed on the curved portion;
A coating layer that is in close contact with the conductor layer and covers the conductor layer with the curved portion;
A sensor sheet comprising: The conductor layer is
A first connection terminal electrically connected to the first electrode and electrically connected to the detection circuit;
A second connection terminal electrically connected to the second electrode and electrically connected to the detection circuit;
Have
2. The sensor according to claim 1, wherein the first connection terminal and the second connection terminal are arranged on either the first surface or the second surface of the sheet-like substrate. Sheet.   3. The sensor sheet according to claim 1, wherein a thickness of the covering layer is thinner than ½ of a thickness of the dielectric.   The sensor sheet according to any one of claims 1 to 3, wherein the coating layer is made of a resist laminated on the conductor layer.

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