JP2003280815A - Touch panel with antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel with an antenna capable of simplifying the configuration of a radio communication system at the time of using an information processor (e.g. a car navigation device), on which a touch panel is mounted, for the system. <P>SOLUTION: A microstrip path 30 is formed on the upper face of an upper electrode board 14 of a touch panel, and a transparent conductive film 12 fixed to the lower face of the upper electrode board 14 is used as the ground conductor of the microstrip patch 30. The microstrip path 30 is formed in the touch panel so that at the time of using it for a radio communication system, the number of configuring equipment of the system can be reduced. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted information processing device (for example, car navigation device) or PDA (Person).
al Digital Assistants) and the like relates to a resistive film type touch panel used for an input device of an information processing device such as.

[0002]

2. Description of the Related Art Conventionally, this type of touch panel 10 is shown in FIG.
Was configured as shown in. That is, the upper electrode substrate 14 having the transparent conductive film 12 fixed to the lower surface and the lower electrode substrate 18 having the transparent conductive film 16 fixed to the upper surface are arranged in parallel at a predetermined interval and fixed by the bonding member 20. The hard coat 22 is fixed to the upper surface of the electrode substrate 14, and the dot spacers 24 to 24 for short circuit prevention are fixed to the transparent conductive film 16 of the lower electrode substrate 18. On the lower surface of the upper electrode substrate 14, electrodes X ₁ X ₂ for applying a voltage to the transparent conductive film 12 are formed at opposite ends of the transparent conductive film 12 in the X direction (direction perpendicular to the paper surface in FIG. 9). On the upper surface of the lower electrode substrate 18, electrodes Y ₁ and Y ₂ for applying a voltage to the transparent conductive film 16 are formed on opposite ends of the transparent conductive film 16 in the Y direction (left and right direction in FIG. 9) facing each other. Then, the touch panel 10 is mounted on the surface of the display 26 of the information processing device, and a specific portion of the upper electrode substrate 14 is pressed with a finger or a pen,
The corresponding information is input to the information processing device by making the portions of the transparent conductive films 12 and 16 corresponding to the pressing points conductive.

In a car, a car navigation system,
PDA, portable personal computer,
Various electronic devices such as mobile phones are used,
A cable is required to transmit information and signals between these electronic devices, which causes a problem that the mounting method is complicated and the cost is high. In order to solve such a problem, there has been a demand for a wireless communication system capable of communicating without connecting electronic devices with a cable. On the other hand, recently,
Bluetooth is drawing attention as one of the inexpensive short-distance wireless communication means. This Bluetooth is a short-range wireless communication standard and uses wireless in the frequency band of 2.4 GHz within a predetermined range (for example, within 10 m).
It realizes communication with a device at the speed of 1 Mbps.

[0004]

However, when considering a system in which a plurality of electronic devices are wirelessly communicated with each other, an antenna is provided separately for each electronic device, and the number of constituent devices of the system increases. However, there is a problem that the configuration becomes complicated.

The present invention has been made in view of the above problems, and when an information processing device (for example, a car navigation device) equipped with a touch panel is used in a wireless communication system, the system configuration can be simplified. It is an object of the present invention to provide a touch panel with an antenna that can be used.

[0006]

According to a first aspect of the present invention, an upper electrode substrate (14) having a transparent conductive film (12) fixed to its lower surface and a transparent conductive film (16) fixed to its upper surface. A resistive film type touch panel in which a lower electrode substrate (18) is arranged substantially in parallel at a predetermined interval, characterized in that an antenna element is formed on the upper surface of the upper electrode substrate (14).

In the above structure, the antenna element is formed on the upper surface of the upper electrode substrate (14) of the touch panel to have the antenna inside the touch panel. Therefore, the device equipped with the touch panel is used for the wireless communication system. In this case, the system configuration can be simplified by reducing the number of system components.

According to a second aspect of the present invention, in the first aspect of the invention, in order to simplify the configuration of the antenna element, the antenna element is a microstrip antenna element (30, 30 ₁ to 30 ₄ , 42, 42, and 44), the microstrip antenna element a transparent conductive film (12) fixed to the lower surface of the upper electrode substrate (14) (30, 30 _1-3
0 ₄ , 42, 44) also serves as a ground plane conductor.

The invention according to claim 3 is the invention according to claim 1 or 2.
In order to facilitate the formation of the antenna element, the invention described in (1) is characterized in that the transparent conductive films (12) and (16) and the antenna element are formed of an ITO film.

According to a fourth aspect of the present invention, an upper electrode substrate (14) having a transparent conductive film (12) fixed to the lower surface thereof and a lower electrode substrate (1) having a transparent conductive film (16) fixed to the upper surface thereof.
8) is a resistive film type touch panel arranged substantially parallel to each other at a predetermined interval, and an antenna element is formed on either one of the lower surface of the upper electrode substrate (14) and the upper surface of the lower electrode substrate (18). It is characterized by that.

In the above structure, the upper electrode substrate (1
Since the antenna element is formed on one of the lower surface of 4) and the upper surface of the lower electrode substrate (18) to have the antenna in the touch panel, the device equipped with this touch panel can be used in a wireless communication system. When used, the number of system components can be reduced to simplify the system configuration.

According to a fifth aspect of the invention, in the invention according to the fourth aspect, in order to simplify the configuration of the antenna element, the antenna element is a monopole antenna element (52) and a ground conductor (58). The monopole antenna element (52) is formed, and the touch panel electrodes (X ₁ , X ₂ ) fixed to the lower surface of the upper electrode substrate (14) and the lower electrode substrate (1) are formed.
8) Touch panel electrodes (Y ₁ , Y) fixed to the upper surface of
Part ( ₂ ) of at least one electrode (X ₁ ) is separated by an inductive member (54) for blocking high frequency signals, and the ground conductor (58) is a monopole antenna element (5).
It is characterized in that it is a plane conductor-like ground wire conductor formed on the surface of the electrode substrate (14) on which the 2) is formed, on the monopole antenna element (52) side.

According to the invention of claim 6, in the invention of claim 5, in order to facilitate the formation of the monopole antenna element (52) and the ground conductor (58) and to reduce the length thereof. A monopole antenna element (5
2) to one electrode (X ₁ ) of one electrode substrate (14)
Characterized in that the ground wire conductor (58) is a quarter-wave stub formed in the vicinity of the quarter-wave monopole antenna element. It is what ,

The invention according to claim 7 is the invention according to claim 5 or 6.
In order to prevent a low frequency signal component flowing through the center conductor (36) of the coaxial cable (34),
On the surface of the electrode substrate (14) on which the monopole antenna element (52) is formed, on the monopole antenna element (52) side,
It is characterized in that a capacitive member (56) for capacitively coupling the central conductor (36) of the coaxial cable (34) with the monopole antenna element (52) is formed by printing.

The invention according to claim 8 is the invention according to claim 5, 6 or 7, wherein a monopole antenna element (52) is provided in order to reduce the mechanical length of the monopole antenna element (52). An inductive member (64) for impedance compensation is inserted in a part of the above.

[0016]

FIG. 1 shows a first embodiment of a touch panel with an antenna according to the present invention, and the same parts as those in FIG. 9 are designated by the same reference numerals. In FIG. 1, 14 is an upper electrode substrate and 18 is a lower electrode substrate. The upper electrode substrate 14 is
Glass with a thickness of 150 to 200 μm or 175 to 175
It is formed of a 188 μm PET (polyethylene terephthalate) film. The lower electrode substrate 18 is formed of glass (for example, soda lime glass) having a thickness of 0.7 to 1.8 mm.

A microstrip patch 30 as an example of an antenna element and a microstrip feed line 32 as a feed line are formed on the upper surface of the upper electrode substrate 14, and the microstrip patch 30 and the microstrip feed line 32 are included. A hard coat 22 is formed to prevent scratches and stains on the upper surface. The transparent conductive film 12 is formed on the lower surface of the upper electrode substrate 14.
Microstrip patch 30, a microstrip feed line 32 and the transparent conductive film 12 has a thickness of 100 to 150 angstroms (1 angstrom = 10 ^{over 8} cm)
Of ITO (Indium Tin Oxide) film
The TO film is formed by a known printing technique such as sputtering. At this time, the microstrip patch 30 is formed in a quadrangle having a length L (cm) and a width W (cm), and has a small specific resistance I to reduce antenna loss.
It is desirable to form it with a TO film or another transparent electrode.

The transparent conductive film 1 is formed on the upper surface of the lower electrode substrate 18.
6 are formed, and dot spacers 24 to 24 for preventing short circuit are formed on the upper surface of the transparent conductive film 16. The transparent conductive film 16 is formed of an ITO film having a thickness of 100 to 150 angstroms like the microstrip patch 30. The dot spacer 24 has a diameter of 30 to
The size is 50 μm and the height is 5 to 10 μm.

The lower surface of the upper electrode substrate 14 is located at opposite ends of the transparent conductive film 12 in the X direction (the horizontal direction in FIG. 1A and the direction perpendicular to the paper surface in FIG. 1B). Electrodes X ₁ and X ₂ for applying a voltage are formed on the transparent conductive film 12. The transparent conductive film 16 is located on the upper surface of the lower electrode substrate 18 at opposite ends in the Y direction of the transparent conductive film 16 (the vertical direction in FIG. 1A and the horizontal direction in FIG. 1B). Electrodes Y ₁ and Y ₂ for applying a voltage are formed. The electrodes X ₁ , X ₂ , Y ₁ , and Y ₂ are formed of a conductive metal (for example, gold or silver) having a smaller specific resistance than the transparent conductive film 12 and the transparent conductive film 16, and the transparent conductive film 1
2. The transparent conductive film 16 is formed by the same manufacturing method (for example, a sputtering method).

The upper electrode substrate 14 and the lower electrode substrate 18 are
The bonding member 20 is fixed on the outer periphery of the facing surface. The bonding member 20 has a thickness of 75.
˜200 μm, and the inter-substrate gap between the upper electrode substrate 14 and the lower electrode substrate 18 is maintained at 100 to 30 μm.

When the microstrip patch 30 is used as the microstrip antenna element of the device, it is electrically connected to the center conductor 36 of the coaxial cable 34 through the microstrip feed line 32, as shown in FIG. , The transparent conductive film 12 through the capacitor 40 for blocking the DC signal component, and the outer conductor 38 of the coaxial cable 34.
Electrically connect to. Therefore, the transparent conductive film 12 also serves as the ground plane conductor of the microstrip antenna element, and the microstrip patch 30 of the upper electrode substrate 14 is used.
The portion sandwiched by the transparent conductive film 12 operates as a resonator containing a dielectric.

When the input impedance of the microstrip patch 30 is Zi, the characteristic impedance of the microstrip feed line 32 is Zt, and the characteristic impedance of the coaxial cable 34 is Zo, the following equation (1) is established between them. Impedance matching can be achieved. Zt = √ (Zo · Zi) (1) If the center wavelength of the transmission / reception radio wave targeted by the microstrip patch 30 is λ ₀ (its frequency f ₀ ), then W and L of the microstrip patch 30 In the next (2)
Expression (3) is established. Zi = 60λ ₀ / W (2) L = 0.49λ ₀ / √ε _r (3) In the above formula (3), ε _r represents the relative dielectric constant of the upper electrode substrate 14.

When the microstrip patch 30 is used for a Bluetooth antenna, f ₀ = 2.4.
Since it becomes GHz (2.4 × 10 ⁹ Hz), λ ₀ is about 1
It will be 2.5 cm. Then, when ε _r is 4, L becomes about 3.1 cm from the equation (3). Further, when Zi is set to 200Ω, W becomes about 3.8 cm from the equation (2). Therefore, the microstrip patch 30 can be easily formed even on a touch panel having a relatively small area. When Z ₀ is 50Ω, Zt can be calculated from the equation (1).
Is 100Ω. That is, impedance matching can be achieved by setting the characteristic impedance Zt of the λ / 4 microstrip feed line 32 to 100Ω.

FIG. 2 shows a second embodiment of the touch panel with an antenna according to the present invention. The same parts as those in FIG. In the example of FIG. 2, when a plurality of microstrip patches are provided to widen the usable frequency band,
Alternatively, the case where the number of usable frequency bands is increased is shown. Figure 2
In the above, 30 ₁ , 30 ₂ , 30 ₃ , and 30 ₄ are L ₁ , L ₂ , L ₃ , and L ₄ (cm) in the vertical direction and W ₁ in the horizontal direction, respectively.
Represents W ₂ , W ₃ , W ₄ (cm) microstrip patches, these microstrip patches 30 ₁ , 3
0 ₂ , 30 ₃ , and 30 ₄ are formed in parallel on the upper surface of the upper electrode substrate 14 with intervals G ₁₂ , G ₂₃ , and G ₃₄ (cm) for isolation. G ₁₂ ,
G _{23, G 34} is set to, for example, 5 to 10 mm.

The microstrip patch 30 of FIG.₁,
Thirty_Two, 30_Three, 30_FourSend and receive for each of
The frequency characteristics of the radio wave are shown in FIG.₁, F_Two,
F_Three, F _FourAssuming the characteristics shown in,
As shown by the solid line F in the figure,
It can be wide. Also, in FIG.
₁, F_Two, F_Three, F_FourIf the frequency characteristics shown in
If it is separated so as not to exist, usable frequency
The number of bands can be increased. In FIG. 3, VSWR
Is the Voltage Standing Wave Ratio
Represent

In the embodiment shown in FIGS. 1 and 2, the case where the shape of the microstrip patch is a quadrangle has been described. However, the present invention is not limited to this, and the case of a polygon other than the quadrangle (eg, a pentagon) It can also be used for circular and circular cases.

In the embodiments shown in FIGS. 1 and 2, the case where the microstrip antenna element is a microstrip patch has been described, but the present invention is not limited to this, and the microstrip antenna element is a microstrip patch. It can also be used in other cases. For example, the microstrip antenna element 42 in which the microstrip line is formed into a rectangular spiral shape as shown in FIG. 4A can also be used in the case of being formed on the upper surface of the upper electrode substrate 14. It can also be used in the case where the microstrip antenna element 44 in which the microstrip line is formed in a square meandering shape (that is, a planar coil shape) as shown in FIG. 4B is formed on the upper surface of the upper electrode substrate 14.

FIG. 5 shows a third embodiment of the touch panel with an antenna according to the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals. 5, 50 electrodes formed in a planar shape conductor rod, 52 line length lambda _0/4 of the formed flat conductor rod a quarter wavelength monopole antenna element (hereinafter simply monopole antenna elements , 54 is the electrode 5
0 and the inserted inductive element for high-frequency signal blocking between the monopole antenna elements 52, 56 are capacitive member, 58 is a quarter of the line length are formed by flat conductor rod lambda _0/4
It is a wavelength stub (hereinafter simply referred to as a stub).

The electrode 50, the monopole antenna element 52,
The inductive member 54, the capacitive member 56, and the stub 58 are made of a conductive metal (for example, gold or silver) having a smaller specific resistance than the transparent conductive film 12 and the transparent conductive film 16 as a material. The upper electrode substrate 14 is manufactured by the same manufacturing method as the film 16.
Is printed on the lower surface of the.

The electrode 50, the monopole antenna element 52 and the inductive member 54 are formed at one end of the transparent conductive film 12 to form the electrode X ₁ . An input terminal of a touch panel power supply (for example, a constant current power supply) is connected to the electrode 50. The capacitive member 56 capacitively couples the end of the monopole antenna element 52 on the inductive member 54 side to the center conductor 36 of the coaxial cable 34 so that the signal received by the monopole antenna element 52 is transmitted to the center of the coaxial cable 34. It is input to the receiver 60 via the conductor 36. One end of the stub 58 is formed near the end of the monopole antenna element 52 on the inductive member 54 side, and is connected to the outer conductor 38 of the coaxial cable 34. The outer conductor 38 of the coaxial cable 34 on the receiver 60 side is grounded. For this reason,
The monopole antenna element 52 corresponds to a quarter-wave monopole antenna using the stub 58 as a ground conductor, that is, a brown antenna, and the ground conductor length of the stub 58 is λ ₀ /
4 to make the resonance state, and the outer conductor 3 of the coaxial cable 34.
No current is flowing through 8.

Although the center conductor 36 of the coaxial cable 34 is coupled to the monopole antenna element 52 through the capacitive member 56 in the example shown in FIG. 5, the present invention is not limited to this. For example, as shown in FIG. 6, the center conductor 36 of the coaxial cable 34 may be directly connected to the monopole antenna element 52. In this case, the center conductor 36 of the coaxial cable 34
And a signal input terminal of the receiver 60, a capacitor 62 for blocking a DC component is inserted.

In the example shown in FIG. 5 and FIG.
The mechanical length of the antenna element 52 is λ ₀When it is / 4
However, the present invention is not limited to this.
Impedance compensation for part of the nopole antenna element 52
Insert the member and set the electrical length to λ₀Also in case of / 4
Can be used. For example, as shown in FIGS.
Antenna element 6 formed of a flat conductor rod
6, 68 and inductive member 64 for impedance compensation
Also when the monopole antenna element 52 is configured
Can be used. In this case, a monopole antenna
Let the mechanical length of the element 52 be λ₀Less than / 4
You can

In the example shown in FIGS. 5, 6 and 7, the monopo
The electrical length of the antenna element 52 is λ ₀/ 4 and stub
The electrical length of 58 is λ₀I explained about the case of / 4
However, the present invention is not limited to this, and the monopole antenna
The electrical length of the element 52 is λ₀Other than / 4 (eg 3λ₀/
4) and / or the electrical length of the stub 58
λ ₀Other than / 4 (eg 3λ₀/ 4)
Can also be used.

In the examples shown in FIGS. 5, 6 and 7, the case where the monopole antenna element 52 is formed on a part of the electrode X ₁ has been described, but the present invention is not limited to this.
And when formed on a part of the electrode _{X 2,} Y 1, _Y of one of the _two electrodes were formed in a part of the two or more electrodes of the electrodes _{X 1,} X _2, Y 1, _{Y 2} It can also be used for cases.

Next, first consider a wireless communication system (vehicle-mounted LAN) for transmitting information and signals between various electronic devices in an automobile, and then equip the constituent devices in this wireless communication system with the antenna according to the present invention. Consider the case of using a touch panel.

First, regarding a wireless communication system for exchanging information and signals between various electronic devices in an automobile,
This will be described with reference to FIG. FIG. 8 shows a system diagram of a wireless communication system, in which reference numeral 70 denotes an in-vehicle information processing device. The vehicle-mounted information processing device 70 includes an operation panel display 71 and a Bluetooth antenna 72 installed on the front panel side. The operation panel display 71 represents a display (for example, LCD) having a touch panel mounted thereon. In-vehicle information processing device 7
0 is a CPU (Central Processing Unit) or ROM (not shown)
(Read-only memory), this CPU is a ROM
Various functions, for example, functions for performing wireless communication with other electronic devices via the Bluetooth antenna 72 are provided by executing the programs in the above.

The in-vehicle information processing device 70 is connected to a music reproducing device 73 such as a DVD player and an MD player, and a brake control unit 75, a transmission control unit 76, an engine control unit via a gateway 74. 7
7 and the slot control unit 78, and further connected to the door mirror / window operation unit 80 via the gateway 79.

Reference numeral 81 is a portable personal computer, 82 is a mobile telephone, and 83 is a portable PDA.
The mobile phone 82 and the PDA 83 are provided with Bluetooth antennas 84, 85 and 86, respectively, and are configured to be able to perform wireless communication with the in-vehicle information processing device 70 via the Bluetooth antenna 72.

Reference numerals 88 and 89 denote GPS (Global Positioning) fixedly installed on the back surface of the rear seat of the vehicle.
System) device and AM / FM receiver. The GPS device 88 is a GPS device for receiving radio waves from GPS satellites.
In addition to having the antenna 90, a Bluetooth antenna 91 capable of wireless communication with the vehicle-mounted information processing device 70 via the Bluetooth antenna 72 is provided. The AM / FM receiver 89 includes an AM / FM antenna 92 for receiving radio waves from an AM / FM broadcasting station, and wirelessly communicates with the in-vehicle information processing device 70 via the Bluetooth antenna 72. Enabled Bluetooth antenna 93 is provided.

In FIG. 8, an in-vehicle information processing device 70 is provided.
The wireless communication function using the Bluetooth antenna 72 allows the portable personal computer 81, the mobile phone 82, the PDA 83, the GPS device 88 or the AM / FM in the automobile.
Bluetooth antennas 82, 8 with receiver 89
Information and signals can be exchanged via 4, 86, 91 or 93. For example, selection items, instruction items, etc. are displayed on the display of the operation panel display 71, and by selecting and instructing selection items, instruction items, etc. for car navigation on the touch panel of the operation panel display 71 by touch operation, In-vehicle information processing device 70 and GP via Bluetooth antennas 72 and 91
Corresponding information and signals are exchanged between the S devices 88. Therefore, the GPS device 88 has the GPS antenna 90.
The current position information of the vehicle received from the GPS satellite via the GPS is confirmed, the map information stored in the built-in DVD-ROM is read, and transmitted to the in-vehicle information processing device 70 via the Bluetooth antennas 91 and 72. The corresponding map and current vehicle position are displayed on the display of the operation panel display 71. Therefore, the in-vehicle information processing device 70, the portable personal computer 81, the mobile phone 82, the PD
Compared to a wired communication system in which the A83, the GPS device 88, and the AM / FM receiver 89 are connected with a cable to exchange information and signals, the installation is simple and the cost can be reduced.

Next, a case where the touch panel with an antenna according to the present invention is used for the electronic equipment in the wireless communication system shown in FIG. 8 will be described. In FIG. 8, the Bluetooth antenna 72 is provided outside the operation panel display 71, but by providing the Bluetooth antenna 72 in the touch panel of the operation panel display 71, the system configuration can be simplified. That is, in FIG. 8, the Bluetooth antenna 72 is shown.
However, the number of components of the system increases, but the number of components of the system can be reduced by integrally providing the Bluetooth antenna 72 in the operation panel display 71. In addition to the in-vehicle information processing device 70, the same effect can be achieved by integrally providing the Bluetooth antenna (for example, the Bluetooth antenna 86) in the touch panel for the electronic device having the touch panel (for example, the PDA 83).

In the above-described embodiment, the case where the antenna is the Bluetooth antenna has been described, but the present invention is not limited to this and can be applied to cases other than the Bluetooth antenna.

[0043]

According to the invention described in claim 1, the antenna is formed in the touch panel by forming the antenna element on the upper surface of the upper electrode substrate (14) of the touch panel. When used in a wireless communication system, the number of constituent devices of the system can be reduced and the configuration can be simplified.

According to a second aspect of the present invention, in the invention according to the first aspect, the antenna element is a microstrip antenna element (30, 30 ₁ to 30 ₄ , 42, 44) and the transparent conductive film (12) is provided. Since the microstrip antenna element (30, 30 ₁ to 30 ₄ , 42, 44) is also used as the ground plane conductor, the configuration of the antenna element can be simplified.

The invention described in claim 3 is the invention according to claim 1 or 2.
In the invention described above, the transparent conductive films (12) and (16) and the antenna element are formed of an ITO film, and the antenna element can be formed by the same manufacturing method as the transparent conductive films (12) and (16). The formation of the antenna element can be facilitated.

According to a fourth aspect of the present invention, the antenna element is formed in the touch panel by forming an antenna element on either the lower surface of the upper electrode substrate (14) or the upper surface of the lower electrode substrate (18) of the touch panel. Since the configuration having the above is adopted, when the device equipped with this touch panel is used in a wireless communication system, the number of constituent devices of the system can be reduced and the configuration can be simplified.

According to the invention described in claim 5, in the invention described in claim 4, since the antenna element is constituted by the monopole antenna element (52) and the ground conductor (58), the configuration of the antenna element can be simplified. You can do it.

According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the monopole antenna element (52) and the ground conductor (58) are connected to one electrode (X) of one electrode substrate (14). _{Since the} quarter-wavelength monopole antenna element formed in ₁ ) is a quarter-wavelength stub, the monopole antenna element (52) and the ground conductor (58) can be easily formed. Its length can be reduced.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the invention described in 1., the capacitive member (56) is formed by printing on the surface of the electrode substrate (14) on which the monopole antenna element (52) is formed, and the central conductor (36) of the coaxial cable (34).
Is configured to be capable of being capacitively coupled to the monopole antenna element (52), it is possible to block the low frequency signal component flowing through the central conductor (36) of the coaxial cable (34).

Since the invention described in claim 8 is such that, in the invention described in claim 5, 6 or 7, the inductive member (64) is inserted in a part of the monopole antenna element (52). The mechanical length of the monopole antenna element (52) can be reduced.

[Brief description of drawings]

1A and 1B are views showing a first embodiment of a touch panel with an antenna according to the present invention, in which FIG. 1A is a front view and FIG.
Is a cross-sectional view taken along the line AA and shows an enlarged cross-sectional view of a main part showing a connection state with the coaxial cable 34, (c) is a diagram for explaining impedance matching between the microstrip patch 30 and the coaxial cable 34, and (d) is an upper electrode A diagram showing the lower surface side of the substrate 14,
(E) is a view showing the upper surface side of the lower electrode substrate 18.

2A and 2B are views showing a second embodiment of a touch panel with an antenna according to the present invention, FIG. 2A being a front view including a connection state with a coaxial cable 34, and FIG. 2B being microstrip patches 30 ₁ to 30 ₄ . It is a figure which shows a size and a space | interval.

3 is a diagram showing frequency characteristics (versus VSWR) of microstrip patches 30 ₁ to 30 ₄ in the case of FIG.

FIG. 4 is a diagram showing another example of the microstrip patch shown in FIGS. 1 and 2.

FIG. 5 is an enlarged view of an essential part showing a third embodiment of the touch panel with an antenna according to the present invention.

FIG. 6 is an enlarged view of a main part showing a modified example of the example of FIG.

FIG. 7 is an enlarged view of an essential part showing a modification of FIGS. 5 and 6;

FIG. 8 is a diagram showing a system configuration when an automobile information processing apparatus using the touch panel with an antenna according to the present invention as an operation panel is used in a wireless communication system using a Bluetooth function.

FIG. 9 is a partially enlarged sectional view showing a conventional example of a touch panel.

[Explanation of symbols]

12, 16 ... Transparent conductive film, 14 ... Upper electrode substrate, 18
... lower electrode substrate, 30 ... microstrip patch,
32 ... Microstrip feed line, 34 ... Coaxial cable, 36 ... Central conductor of coaxial cable 34, 38 ... Coat conductor of coaxial cable 34, 50 ... Electrode, 52 ... Monopole antenna element, 54 ... Inductive member, 56 ...
Capacitive member, 58 ... Quarter wave stub.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01Q 21/06 H01Q 21/06 (72) Inventor Harumi Kano 6-5-5 Togoshi, Shinagawa-ku, Tokyo Sue Mukei Co., Ltd. F term (reference) AA12 AB03 AB06 AB13 EF04 EF05

Claims (8)

[Claims] 1. An upper electrode substrate (14) having a transparent conductive film (12) fixed to its lower surface and a lower electrode substrate (18) having a transparent conductive film (16) fixed to its upper surface are substantially parallel to each other at a predetermined interval. A touch panel with an antenna, wherein the touch panel is a resistive film type touch panel, wherein an antenna element is formed on the upper surface of the upper electrode substrate (14). 2. The antenna element is a microstrip antenna element (30, 30 ₁ to 30 ₄ , 42, 44),
The transparent conductive film (1) fixed to the lower surface of the upper electrode substrate (14)
2) Microstrip antenna element (30, 30 ₁
30 _4, the antenna with touch panel according to claim 1, characterized in that also serves as the ground plane conductor 42, 44). 3. The touch panel with an antenna according to claim 1, wherein the transparent conductive films (12) and (16) and the antenna element are formed of an ITO film. 4. An upper electrode substrate (14) having a transparent conductive film (12) fixed to its lower surface and a lower electrode substrate (18) having a transparent conductive film (16) fixed to its upper surface are substantially parallel to each other at a predetermined interval. A touch panel with an antenna, wherein the antenna element is formed on either one of the lower surface of the upper electrode substrate (14) and the upper surface of the lower electrode substrate (18). 5. The touch panel electrode fixed to the lower surface of the upper electrode substrate (14), wherein the antenna element is formed of a monopole antenna element (52) and a ground conductor (58). (X ₁ , X ₂ ) and at least one electrode (X ₁ ) of the touch panel electrodes (Y ₁ , Y ₂ ) fixed to the upper surface of the lower electrode substrate (18).
Of the electrode substrate (14) on which the monopole antenna element (52) is formed. The touch panel with antenna according to claim 4, wherein the ground conductor is a plane conductor formed on the surface of the element (52) side. 6. A monopole antenna element (52) comprising one
A quarter-wave monopole antenna element formed on _one electrode (X ₁ ) of one electrode substrate (14), and a ground wire conductor (58) near the quarter-wave monopole antenna element. The touch panel with an antenna according to claim 5, wherein the formed quarter-wave stub is formed. 7. A monopole antenna element (5) of an electrode substrate (14) on which a monopole antenna element (52) is formed.
On the surface on the 2) side, the central conductor (3
7. The touch panel with an antenna according to claim 5, wherein a capacitive member (56) for capacitively coupling 6) with the monopole antenna element (52) is formed by printing. 8. A touch panel with an antenna according to claim 5, wherein an inductive member (64) for impedance compensation is inserted in a part of the monopole antenna element (52).