JP5286228B2 - TOUCH PAD INPUT DEVICE WITH ANTENNA AND ELECTRONIC DEVICE HAVING THE DEVICE - Google Patents

Description

  The present invention relates to a touchpad input device with an antenna, and an electronic apparatus equipped with the device.

  The touch pad input device is mounted on an electronic device such as a laptop personal computer (laptop computer). In a laptop computer, a main body having a keyboard and a display are connected by a hinge. In this main body, a touch pad input device is disposed on the front side of the keyboard.

In the laptop computer, a shield member is provided inside the housing of the main body. The shield member is provided so as to cover the electronic device inside the main body, and suppresses the emission or incidence of unwanted electromagnetic waves (EMI countermeasures).
However, the housing and the shield member of the main body are provided with an opening for arranging the touch pad input device, and the face sheet of the touch pad input device is exposed at the opening to form a sensing surface.

  The touch pad input device includes a measurement electrode group and a detection circuit for detecting an object approaching the sensing surface. The measurement electrode group includes, for example, a plurality of X electrodes extending along the sensing surface, a plurality of Y electrodes extending in a direction orthogonal to the X electrodes, and detection electrodes arranged to mesh with the Y electrodes. In this case, the approach of the object to the sensing surface is detected by detecting a change in capacitance between the X electrode or Y electrode and the detection electrode.

  Patent Document 1 proposes a touchpad module with an antenna obtained by adding an antenna to this type of touchpad input device. In this touchpad module, it is considered that communication with the outside becomes possible through the antenna by arranging the antenna in the opening of the shield member.

  In the touchpad module disclosed in Patent Document 1, for example, the antenna is provided on the printed circuit board of the touchpad. It is also contemplated that the antenna can be placed in a separate flexible layer between or adjacent to the layers used for the touchpad array itself.

JP-T-2002-539517 (paragraph numbers 0006, 0014, 0033 and FIG. 3 etc.)

Some touch pad input devices have a conductive planar shield layer between a measurement electrode group and a circuit board on which a detection circuit is mounted in order to improve object detection accuracy.
In a touchpad input device having this type of shield layer, when an antenna is provided in the same layer as the shield layer, many eddy currents are generated in the shield layer when the antenna communicates with the outside. Therefore, in this case, the sensitivity of the antenna is low, and the communication performance of the touchpad input device is low.

  The present invention has been made based on the above-described circumstances, and the object of the present invention is to provide a touchpad input device with an antenna having good communication performance while ensuring the sensitivity of the antenna while the antenna is disposed in the vicinity of the shield layer, and An object of the present invention is to provide an electronic device equipped with the apparatus.

  In order to achieve the above object, the present invention employs the following solutions.

  First Solution: According to one aspect of the present invention, a sensing surface that is exposed at an opening provided in a shield member that shields radiation noise in an electronic device, and provided along the sensing surface, A measurement electrode group for detecting the approach of an object to the sensing surface based on a change in capacitance, a shield electrode provided along the opposite side of the measurement electrode group to the sensing surface, and the measurement In the touchpad input device with an antenna, comprising the electrode group and at least one support substrate for supporting the shield electrode, and an antenna for communicating with the outside through the opening of the shield member, the shield electrode is the measurement electrode. A body portion located in a projection area where the measurement electrode group is projected in the stacking direction of the group and the shield electrode, and a plurality of parts located in non-projection areas other than the projection area. The antenna includes a shield layer antenna disposed in the vicinity of the shield electrode in the stacking direction and disposed on the outer edge side of the support substrate with respect to the shield electrode. A touchpad input device with an antenna is provided.

According to the touchpad input device with an antenna of the first solving means, a part of the magnetic flux generated by the antenna passes through the opening of the shield electrode, thereby reducing the eddy current generated in the shield electrode. . In other words, the antenna sensitivity is prevented from lowering by the opening of the shield electrode.
On the other hand, in this touch pad input device with an antenna, the main body part of the shield electrode is located in a projection area where the measurement electrode group is projected, and the main body part of the shield electrode causes the measurement electrode group from the shield electrode side to be projected. Noise is blocked.
As a result, the touchpad input device with an antenna has good communication performance while having good object detection performance.

  Second solving means: Preferably, the antenna is disposed within a range in which the measurement electrode group is disposed in the stacking direction, and is disposed on an outer edge side of the support substrate with respect to the measurement electrode group. It further includes an electrode group layer antenna, and the shield layer antenna and the electrode group layer antenna are electrically connected to each other to form a helical antenna.

  According to the touchpad input device with an antenna of the second solving means, the electrode group layer antenna constitutes a helical antenna together with the shield layer antenna, so that the number of antenna turns is set to a desired number. In other words, since the antenna extends in multiple layers, the number of rounds of the antenna is sufficiently ensured even if the measurement electrode group and the shield electrode are large. As a result, the antenna is more sensitive, and the touchpad input device with the antenna has a better communication performance.

  Third solution means: Preferably, the measurement electrode group is separated from each other in a first direction parallel to the sensing surface, and is parallel to the sensing surface and orthogonal to the first direction. A plurality of first electrodes each extending in a second direction, and a plurality of second electrodes disposed on the opposite side of the sensing surface with respect to the first electrodes, wherein the second electrodes are mutually in the second direction. A plurality of second electrodes that are spaced apart and extend in the first direction, and the support substrate is a first support substrate that supports the first electrode, and the sensing surface with respect to the first support substrate. A second support substrate disposed on the opposite side and supporting the second electrode.

  The touchpad input device with an antenna of the third solving means includes a plurality of first electrodes and second electrodes as a measurement electrode group, and includes a first support substrate and a second support substrate as support substrates. This touch pad input device with an antenna reliably detects the approach of an object to the sensing surface with a simple configuration.

  Fourth solving means: Preferably, the first support substrate and the second support substrate have a long side extending in one direction of the first direction and the second direction and a short side extending in the other direction. The electrode group layer antenna is provided on the first support substrate, and is provided on the first support substrate antenna element extending along the short side, and on the second support substrate, And a second support substrate antenna element extending along the long side.

According to the touch pad input device with an antenna of the fourth solving means, the electrode group layer antenna includes the first support substrate antenna element. Of the support substrates, the first support substrate is closest to the sensing surface, and thus the first support substrate antenna element is disposed in the vicinity of the outside. For this reason, the antenna has excellent sensitivity.
On the other hand, the first support substrate is closest to the sensing surface, and if the area of the antenna provided on the first support substrate is large, the object detection area may be narrowed. Therefore, in this touchpad input device with an antenna, the first support substrate antenna element extends along the short side of the first support substrate, and the area of the first support substrate antenna element in the first support substrate is suppressed to be narrow. ing. For this reason, in this touchpad input device with an antenna, the narrowing of the detection area is suppressed.
As a result, the touchpad input device with an antenna is excellent in both communication performance and object detection performance.

Fifth solution means: Preferably, the above and the measurement electrode group to shield electrode disposed opposite, changes in electrostatic capacity proximity of the object relative to the measuring electrode group in cooperation with the sensing surface And a ground electrode provided on the circuit board. The shield layer antenna is electrically connected to the ground electrode via a varistor or a Zener diode. Connected.

  According to the touchpad input device with an antenna of the fifth solving means, the shield layer antenna also functions as a frame ground by being connected to the ground electrode via the varistor or the Zener diode. As a result, this touchpad input device with an antenna is excellent in EMI countermeasures.

  Sixth Solution: Preferably, the measurement electrode group is separated from each other in a first direction parallel to the sensing surface, and is parallel to the sensing surface and orthogonal to the first direction. A plurality of first electrodes each extending in a second direction, and a plurality of second electrodes disposed on the opposite side of the sensing surface with respect to the first electrodes, wherein the second electrodes are mutually in the second direction. A plurality of second electrodes that are spaced apart and extend in the first direction, and the support substrate is a first support substrate that supports the first electrode, and the sensing surface with respect to the first support substrate. A second support substrate disposed on the opposite side and supporting the second electrode, wherein the electrode group layer antenna is provided on the first support substrate so as to surround the first electrode. Contains elements.

  According to the touchpad input device with an antenna of the sixth solving means, the first support substrate antenna element protects the detection circuit from overvoltage / overcurrent caused by static electricity or the like.

Seventh Solution: As another aspect of the present invention, there is provided an electronic apparatus including the touchpad input device with an antenna according to any one of the solutions 1 to 6.
The electronic device of the seventh solution means that the touch pad input device with an antenna is excellent in object detection performance and communication performance, and therefore operates smoothly as intended by the person who operates the electronic device.

  ADVANTAGE OF THE INVENTION According to this invention, the antenna touchpad input device which has the antenna sensitivity arrange | positioned in the vicinity of a shield electrode, the antenna sensitivity is ensured, and has favorable communication performance, and the electronic device carrying this apparatus are provided.

1 is a perspective view showing an appearance of a personal computer equipped with a touchpad input device with an antenna according to a first embodiment. It is a schematic fragmentary sectional view which follows the II-II line | wire of FIG. It is a perspective view which shows the schematic external appearance of the touchpad input device with an antenna of 1st Embodiment. FIG. 4 is a schematic exploded perspective view of the antenna-equipped touchpad input device of FIG. 3. FIG. 5 is a schematic plan view of a shield layer in FIG. 4. FIG. 5 is a schematic plan view of an X electrode layer in FIG. 4. FIG. 5 is a schematic plan view of a Y electrode layer in FIG. 4. FIG. 5 is a schematic plan view of the printed circuit board in FIG. 4. It is a figure which shows the shape which projected the helical antenna on the plane. It is a schematic exploded perspective view of the touchpad input device with an antenna of a 2nd embodiment. FIG. 11 is a schematic plan view of an X electrode layer in FIG. 10. It is a block diagram for demonstrating the unbalanced circuit which connects a helical antenna and a matching circuit. It is a block diagram for demonstrating the balanced circuit which connects a helical antenna and a matching circuit.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a laptop personal computer (electronic device) 11 equipped with a touchpad input device 10 with an antenna according to the first embodiment. The computer 11 has a main body 12 and a display 14, and the main body 12 and the display 14 are coupled via a hinge. The display 14 reversibly stands (opens) with respect to the main body 12 by being rotated about the hinge as a fulcrum from a state of being superimposed on the main body 12 that is normally placed flat (closed state).

  The display 14 has a display housing 16 made of, for example, resin. The display housing 16 has a flat box shape and has a size substantially equal to, for example, A4 paper. The display housing 16 has a surface (inner surface) that faces the main body 12 when in the closed state, and an opening is formed on the inner surface of the display housing 16 over substantially the entire area. For example, a liquid crystal panel 18 is exposed in the opening 16 a of the display housing 16.

The main body 12 has a flat box-shaped resin main housing 20.
An opening 20a is provided on the upper surface of the main housing 20 facing the display 14 in the closed state when viewed from the liquid crystal panel 18, that is, on the hinge side, and the keyboard 21 is disposed in the opening 20a. Has been. The size of the upper surface of the main housing 20 is substantially the same as the inner surface of the display housing 16.

An opening 20 b is also formed on the upper surface of the main housing 20 at the center in front of the keyboard 21. The face sheet 22 of the touchpad input device with an antenna 10 is exposed in the opening 20b.
Further, an opening 20c is formed on the upper surface of the main housing 20 in front of the opening 20b, and two buttons 24a and 24b are exposed side by side in the width direction of the main housing 20 in the opening 20c.
In addition, the area | region of the both sides of opening 20b, 20c in the upper surface of the main housing 20 functions as a palm rest.

FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and shows a partial cross section of the main body 12.
A metal shield member 26 is provided inside the main housing 20. The shield member 26 has a slightly smaller shape than the main housing 20, and substantially the entire area is covered by the main housing 20 except for the area where the keyboard 21, the face sheet 22, and the buttons 24 a and 24 b are exposed.

An opening 26 a is formed on the upper wall of the shield member 26 corresponding to the position of the opening 20 b of the main housing 20. A slightly larger bottom plate 27a than the opening 26a is disposed inside the shield member 26 so as to correspond to the opening 26a. The bottom plate 27a has conductivity, and the bottom plate 27a and the upper wall of the shield member 26 are mechanically and electrically connected by, for example, a plurality of conductive connection members 27b.
The bottom plate 27 a is disposed so as to close the opening 26 a of the shield member 26, but the bottom plate 27 a is separated from the upper wall of the shield member 26. For this reason, the bottom plate 27a and the connection member 27b form a recess 27 continuous with the opening 26a, and the touchpad input device 10 with an antenna is disposed in the recess 27.

[Touchpad input device with antenna]
The touchpad input device with an antenna 10 includes a printed circuit board 28 having wiring (not shown) having an appropriate pattern, and the printed circuit board 28 is fixed in the recess 27 by a support member (not shown).

The printed circuit board 28 is disposed substantially parallel to the upper surface of the main housing 20. Electrical elements such as LSI chips 30a and 30b are mounted on the bottom surface of the recess 27, that is, the bottom surface of the printed circuit board 28 facing the bottom plate 27a.
A laminated body 32 including the face sheet 22 is fixed to the upper surface of the printed circuit board located on the opening 20b side.

FIG. 3 is a perspective view showing a schematic appearance of the touchpad input device 10 with an antenna. The printed circuit board 28 has a rectangular shape equivalent to the laminated body 32, and the laminated body 32 is fixed to one surface of the printed circuit board 28. The stacked body 32 is connected to an electrical element mounted on the other surface of the printed circuit board 28.
The electrical element mounted on the printed circuit board 28 is connected to a mother board (not shown) disposed inside the shield member 26 through an input terminal.

[Laminate]
FIG. 4 is a schematic perspective view showing the touch pad input device 10 with the antenna in an exploded manner.
The stacked body 32 includes an X electrode layer 34, a Y electrode layer 36, and a shield electrode layer 38 in order from the face sheet 22 side. The face sheet 22, the X electrode layer 34, the Y electrode layer 36, and the shield electrode layer 38 are in close contact with each other by an adhesive or the like.

The X electrode layer 34 includes a film substrate (X electrode substrate) 34a and a plurality of X electrodes 34b formed integrally with the film substrate 34a. The X electrodes 34b are distributed over substantially the entire area of one surface of the film substrate 34a.
Specifically, the film substrate 34 a has a rectangular shape, the short side of the film substrate 34 a extends in the depth direction of the main body 12 of the personal computer 11, and the long side of the film substrate 34 a is the width direction of the main body 12 of the personal computer 11. It extends to.
The X electrode 34b is composed of a plurality of conductive strips parallel to each other, and the conductive strips extend in the direction of the short side of the film substrate 34a and are spaced apart from each other in the direction of the long side of the film substrate 34a. Are separated.

The Y electrode layer 36 includes a film substrate (Y electrode substrate) 36a and a plurality of Y electrodes 36b formed integrally with the film substrate 36a. The Y electrode layer 36 includes a comb-shaped detection electrode 36c formed integrally with the film substrate 36a. The Y electrode 36b and the detection electrode 36c are distributed over substantially the entire area of one surface of the film substrate 36a while being arranged so as to mesh with each other.
Specifically, the film substrate 36a has the same rectangular shape as the film substrate 34a. The Y electrode 36b is composed of a plurality of conductive strips parallel to each other, and the conductive strips extend in the direction of the long side of the film substrate 36a and are spaced apart from each other in the direction of the short side of the film substrate 36a. Are separated.

  The detection electrode 36c includes a plurality of conductive bands parallel to each other and one conductive band that connects one end of these bands to each other. Similarly to the plurality of conductive bands of the Y electrode 36b, the plurality of conductive bands of the detection electrode 36c also extend in the direction of the long side of the film substrate 36a, and mutually extend in the direction of the short side of the film substrate 36a. They are spaced at regular intervals. The plurality of conductive bands of the detection electrode 36c are arranged between the plurality of conductive bands of the Y electrode 36b.

  Therefore, the Y electrode 36b and the X electrode 34b are orthogonal to each other in a grid pattern when viewed in the stacking direction. The detection electrode 36 c, the Y electrode 36 b, and the X electrode 34 b constitute a measurement electrode group for detecting the position of an object such as a fingertip that approaches or contacts the surface of the face sheet 22.

The shield electrode layer 38 includes a film substrate (shield electrode substrate) 40 and a shield electrode 42 formed integrally with the film substrate 40.
The shield electrode 42 has a layered main body 44 made of a conductive material, and a plurality of openings 46 are formed in the main body 44. The main body 44 is located at a projection position where the X electrode 34b, the Y electrode 36b, and the detection electrode 36c are projected in the stacking direction of the X electrode layer 34, the Y electrode layer 36b, and the shield electrode layer 38. The opening 46 is located at a non-projection position where the X electrode 34b, the Y electrode 36b and the detection electrode 36c are not projected in the stacking direction. Therefore, the main body portion 42 of the shield electrode 42 has a grid shape that combines the X electrode 34b, the Y electrode 36b, and the detection electrode 36c.
The film substrates 34a, 36a, 40 and the face sheet 22 have substantially the same shape, and are overlapped with each other with four corners aligned.

[Antenna layer]
And the touchpad input device 10 with an antenna has an antenna for communicating with the exterior.
As shown in FIG. 5, the antenna includes at least an antenna pattern (shield layer antenna) 48 formed integrally with the shield electrode substrate 40. The shield layer antenna 48 is made of a conductor band, and is provided on the outer edge side of the shield electrode substrate 40 with respect to the shield electrode 42. For example, the shield layer antenna 48 has a spiral shape and extends around the shield electrode 42 over 1.75 circumferences.
The shield layer antenna 48 is disposed in the vicinity of the shield electrode 42 in the stacking direction. In the present embodiment, the shield layer antenna 48 and the shield electrode 42 are disposed in the same layer. The vicinity of the shield electrode 42 in the stacking direction refers to a range from the printed circuit board 28 to the measurement electrode group.

Preferably, the antenna includes an antenna pattern (X electrode substrate antenna element) 50 integrally formed on the X electrode substrate 34a, and an antenna pattern (Y electrode substrate antenna element) 52 integrally formed on the Y electrode substrate 36a. including.
As shown in FIG. 6, the antenna pattern 50 includes two conductor bands 50a and 50b extending in the short side direction of the X electrode substrate 34a. The antenna pattern 50 extends from the X electrode 34b in the long side direction of the X electrode substrate 34a. Is also provided on the outer edge side of the X electrode substrate 34a. The antenna pattern 50 is disposed in the vicinity of the X electrode 34b in the stacking direction. In the present embodiment, the antenna pattern 50 and the X electrode 34b are disposed in the same layer.

As shown in FIG. 7, the antenna pattern 52 includes two conductor bands 52a and 52b, and is provided on the outer edge side of the Y electrode substrate 36a with respect to the Y electrode 36b and the detection electrode 36c.
Specifically, the band 52a extends in the long side direction of the Y electrode substrate 36a, and the band 52b has a spiral shape and extends around the Y electrode 36b and the detection electrode 36c over 1.25 rounds. The antenna pattern 52 is disposed in the vicinity of the Y electrode 36b in the stacking direction. In the present embodiment, the antenna pattern 52 and the Y electrode 36b are disposed in the same layer.

More preferably, the antenna includes an antenna pattern 54 formed integrally with the printed circuit board 28 as shown in FIG. 8, and the antenna pattern 54 extends in the long side direction of the printed circuit board 28. The antenna pattern 54 may be formed on the laminated body 32 side of the printed circuit board 28, or may be formed on the opposite side of the laminated body 32.
The shield layer antenna 48 and the antenna patterns 50, 52, and 54 are electrically connected to each other so as to constitute one helical antenna HA.
Here, FIG. 9 schematically shows a shape when the helical antenna HA is projected onto a plane in the stacking direction. The shield layer antenna 48 and the antenna patterns 50, 52, 54 can be electrically connected through through holes formed in the X electrode substrate 34 a, the Y electrode substrate 36 a, and the shield electrode substrate 40, for example.
As materials for the X electrode 34b, the Y electrode 36b, the detection electrode 36c, and the antenna, a metal such as aluminum or copper can be used, but a conductive oxide such as ITO (indium tin oxide) can also be used. Good.

According to the antenna-equipped touchpad input device 10 of the first embodiment described above, a part of the magnetic flux generated by the helical antenna HA is generated at the shield electrode 42 by passing through the opening 46 of the shield electrode 42. Eddy current is reduced. That is, the decrease in sensitivity of the helical antenna HA is suppressed by the opening 46 of the shield electrode 42.
On the other hand, in the touchpad input device 10 with the antenna, the main body 44 of the shield electrode 42 is located in a projection region where the measurement electrode group, that is, the X electrode 34b, the Y electrode 36b, and the detection electrode 36c is projected. The main body 44 of the electrode 42 blocks noise from the shield electrode 42 side to the measurement electrode group.
As a result of these, the antenna-equipped touch pad input device 10 has good communication performance while having good object detection performance.

  According to the touchpad input device with an antenna 10 of the first embodiment described above, the antenna patterns 50, 52, and 54 constitute the helical antenna HA together with the shield layer antenna 48, so that the number of turns of the helical antenna HA becomes a desired number of turns. Set to number of times. That is, since the helical antenna HA extends in multiple layers, the number of turns of the helical antenna HA is sufficiently ensured even if the measurement electrode group and the shield electrode 42 are large. As a result, the helical antenna HA is more sensitive, and the antenna-equipped touch pad input device 10 has better communication performance.

  The touchpad input device 10 with an antenna according to the first embodiment described above includes a plurality of X electrodes 34b, Y electrodes 36b, and detection electrodes 36c as measurement electrode groups, and the X electrodes 34b, Y electrodes 36b, and detection electrodes 36c. An X electrode substrate 34a and a Y electrode substrate 36a to be supported are provided. This touch pad input device 10 with an antenna reliably detects the approach of an object to the sensing surface with a simple configuration.

In the touchpad input device with an antenna 10 of the first embodiment described above, the helical antenna HA includes the antenna pattern 50 formed on the X electrode substrate 34a. Since the X electrode substrate 34a is closest to the sensing surface, the antenna pattern 50 is disposed in the vicinity of the outside. For this reason, the helical antenna HA has excellent sensitivity.
On the other hand, the X electrode substrate 34a is closest to the sensing surface, and if the area of the antenna pattern 50 provided on the X electrode substrate 34a is large, the object detection area may be narrowed. Therefore, in the touchpad input device with antenna 10, the antenna pattern 50 extends along the short side of the X electrode substrate 34a, and the area of the antenna pattern 50 on the X electrode substrate 34a is suppressed to be small. For this reason, in the touchpad input device 10 with an antenna, narrowing of a detection area is suppressed.
As a result, the touchpad input device with an antenna 10 is excellent in both communication performance and object detection performance.

  The personal computer 11 equipped with the above-described touchpad input device 10 with an antenna is excellent in object detection performance and communication performance because the touchpad input device 10 with an antenna is excellent in object detection performance and communication performance. Works smoothly.

[Second Embodiment]
Hereinafter, the touchpad input device 100 according to the second embodiment will be described. In addition, about the structure same as the touchpad input device 10 which concerns on 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

9 is an exploded perspective view schematically showing the touch pad input device 100, and FIG. 10 schematically shows an X electrode substrate 34a used in the touch pad input device 100. As shown in FIG.
Instead of the antenna pattern 50, an antenna pattern 56 is integrally formed on the X electrode substrate 34a. The antenna pattern 56 extends in a spiral shape around the X electrode 34b so as to surround the X electrode 34b. In other words, both ends of the antenna pattern 56 are positioned near one corner of the X electrode substrate 34a.
The antenna pattern 52 is not formed on the Y electrode substrate 36, and the shield layer antenna 48 and the antenna patterns 54 and 56 constitute a helical antenna HA. That is, the helical antenna HA preferably includes an antenna (electrode group layer antenna) provided in the same range as the measurement electrode group in the stacking direction, but various changes are made to the arrangement of the electrode group layer antenna. Is possible.

  As shown in FIG. 11, both ends of the helical antenna HA are connected to each other via a capacitor 60. In the case of an unbalanced circuit, one end of the helical antenna HA is connected to, for example, a matching circuit 62 provided on the printed circuit board 28 via a capacitor 64, and the other end of the helical antenna HA is connected to the ground electrode of the printed circuit board 28. Connected. Preferably, the matching circuit 62 side of the helical antenna HA is connected to the ground electrode of the printed circuit board 28 via the varistor 66.

In the case of a balanced circuit, the helical antenna HA is connected to the matching circuit 62 via capacitors 64 and 68 as shown in FIG. Each end of the helical antenna HA is preferably connected to a ground electrode of the printed circuit board 28 via varistors 66 and 70, respectively.
A Zener diode may be used in place of the varistors 66 and 70. That is, the helical antenna HA may be connected to the ground electrode via an electric element that allows current to flow to the ground electrode only when an undesired high voltage is applied to the helical antenna HA.

  In the touchpad input device with an antenna 100 according to the second embodiment described above, the shield antenna 48 also functions as a frame ground because the helical antenna HA is connected to the ground electrode via the varistors 66 and 70. As a result, this antenna-equipped touch pad input device 100 is excellent in EMI countermeasures.

  Further, according to the touchpad input device with antenna 100 according to the second embodiment, the antenna pattern 56 protects the detection circuit from a surge based on static electricity or the like, that is, overvoltage / overcurrent.

The present invention is not limited to the first embodiment and the second embodiment described above, and includes embodiments in which the first embodiment and the second embodiment are combined and embodiments in which various modifications are added.
For example, the X electrode 34b, the Y electrode 36b, the detection electrode 36c, and the shield electrode 42 are formed on separate film substrates 34a, 36a, and 40, but these are formed on the front and back of one or two film substrates. Also good. Alternatively, the X electrode 34b, the Y electrode 36b, the detection electrode 36c, and the shield electrode 42 may be integrally formed on the multilayer printed circuit board using a multilayer printed circuit board.

That is, the structure of the member that supports the X electrode 34b, the Y electrode 36b, the detection electrode 36c, and the shield electrode 42 is not particularly limited.
Further, the detection electrode 36c is omitted, and when the voltage is applied to the X electrode 34b, the Y electrode 36b is used as the detection electrode. Conversely, when the voltage is applied to the Y electrode 36b, the X electrode 34b is used as the detection electrode. It may be used as That is, the configuration of the measurement electrode group is not particularly limited.

Furthermore, the shape of the main body 44 of the shield electrode 42 preferably substantially matches the shape projected by the measurement electrode group, but may be slightly different.
On the other hand, the number of turns of the helical antenna HA is not limited to the first embodiment and the second embodiment.

  Finally, the touchpad input device with an antenna of the present invention has been described as an example embodied in a laptop personal computer, but it can also be applied to mobile electronic devices such as PDAs and mobile phones. Of course. Furthermore, the touchpad input device with an antenna of the present invention can be applied to a touch panel by using a transparent measurement electrode group and a shield electrode 42.

10 Touchpad input device with antenna 11 Personal computer (electronic equipment)
28 Printed circuit board 34a X electrode board (support board)
36a Y electrode substrate (support substrate)
34b X electrode (measurement electrode group)
36b Y electrode (measurement electrode group)
36c Detection electrode (measurement electrode group)
40 Shield electrode substrate (support substrate)
42 Shield Electrode 44 Body 46 Opening 48 Shield Layer Antenna 50 Antenna Pattern (Electrode Group Layer Antenna)
52 Antenna pattern (electrode group layer antenna)

Claims (7)

A sensing surface exposed by an opening provided in a shield member that shields radiation noise in the electronic device;
A measuring electrode group provided along the sensing surface for detecting the approach of an object to the sensing surface based on a change in capacitance;
A shield electrode provided along a side opposite to the sensing surface of the measurement electrode group;
At least one support substrate for supporting the measurement electrode group and the shield electrode;
In the touchpad input device with an antenna comprising an antenna for communicating with the outside through the opening of the shield member,
The shield electrode includes a main body part located in a projection region where the measurement electrode group is projected in the stacking direction of the measurement electrode group and the shield electrode, and a plurality of shield electrodes located in a non-projection region other than the projection region. With an opening of
The touchpad input device with an antenna, wherein the antenna includes a shield layer antenna disposed in the vicinity of the shield electrode in the stacking direction and disposed on an outer edge side of the support substrate with respect to the shield electrode. The antenna further includes an electrode group layer antenna disposed in a range in which the measurement electrode group is disposed in the stacking direction and disposed on an outer edge side of the support substrate from the measurement electrode group,
The touchpad input device with an antenna according to claim 1, wherein the shield layer antenna and the electrode group layer antenna are electrically connected to each other to form a helical antenna. As the measurement electrode group,
A plurality of first electrodes spaced apart from each other in a first direction parallel to the sensing surface and extending in a second direction parallel to the sensing surface and perpendicular to the first direction;
A plurality of second electrodes disposed on a side opposite to the sensing surface with respect to the first electrode, the plurality of second electrodes being spaced apart from each other in the second direction and extending in the first direction, respectively. With electrodes,
As the support substrate,
A first support substrate for supporting the first electrode;
Wherein the said sensing surface relative to the first supporting substrate disposed opposite the antenna with touch pad input device of claim 2, characterized in that it comprises a second supporting substrate for supporting the second electrode. The first support substrate and the second support substrate each have a rectangular shape having a long side extending in one direction and a short side extending in the other direction of the first direction and the second direction,
The electrode group layer antenna is
A first support substrate antenna element provided on the first support substrate and extending along the short side;
The touchpad input device with an antenna according to claim 3, further comprising: a second support substrate antenna element provided on the second support substrate and extending along the long side. Wherein the measuring electrode group to shield electrode disposed opposite the measuring electrode group in cooperation with the detection circuit for detecting on the basis of changes in electrostatic capacity proximity of an object relative to the sensing surface A circuit board on which is mounted,
A ground electrode provided on the circuit board;
The touchpad input device with an antenna according to claim 3, wherein the shield layer antenna is electrically connected to the ground electrode via a varistor or a Zener diode. As the measurement electrode group,
A plurality of first electrodes spaced apart from each other in a first direction parallel to the sensing surface and extending in a second direction parallel to the sensing surface and perpendicular to the first direction;
A plurality of second electrodes disposed on a side opposite to the sensing surface with respect to the first electrode, the plurality of second electrodes being spaced apart from each other in the second direction and extending in the first direction, respectively. With electrodes,
As the support substrate,
A first support substrate for supporting the first electrode;
A second support substrate disposed on a side opposite to the sensing surface with respect to the first support substrate and supporting the second electrode;
The electrode group layer antenna is
The touchpad input device with an antenna according to claim 5, further comprising a first support substrate antenna element provided on the first support substrate so as to surround the first electrode.   An electronic device comprising the antenna-attached touchpad input device according to any one of claims 1 to 6.

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