JP6052013B2 - Wireless device, wireless system, and automatic transaction device - Google Patents

Description

  The present invention relates to a radio apparatus, a radio system, a printing apparatus, and an automatic transaction apparatus in which an antenna and a power feeding unit are independent, and in particular, a radio apparatus and a radio system in which an antenna is fixed and a power feeding unit is movable. And a printing apparatus and an automatic transaction apparatus.

Conventionally, wireless communication using electromagnetic waves such as a wireless LAN has been actively performed, and an antenna is mounted on the wireless device. The wireless LAN uses not only the 2.4 GHz band but also the 900 MHz band, the 5.2 GHz band, and the 5.6 GHz band. These wireless LANs are often used by switching the frequency band according to the amount of data transmission, and the resonance frequency of the antenna is switched accordingly.
Patent Document 1 describes a method of switching the resonance frequency of this antenna. Specifically, there is a structure in which the resonance frequency is changed by adding an electronic component to the antenna and switching the electronic component with a switch. Have been described.
In Patent Document 2, a structure in which a plurality of feeding points are prepared for a pattern portion of a planar antenna, and a resonance frequency is changed by connecting one selected feeding point and an antenna pattern by a pin. Is described.
Further, Patent Document 3 describes a structure in which the resonance frequency is changed by preparing two shared antenna patterns of inverted F type and inverted L type on a printed circuit board.

JP 2012-19526 A JP 2006-217389 A JP 2004-201278 A

By the way, the propagation loss tends to increase as the propagation distance becomes longer and increase as the carrier frequency becomes higher. That is, as the propagation distance between the wireless device and the access point (AP) becomes longer, the propagation loss tends to increase. Wireless communication with a large propagation loss causes a deterioration in communication quality along with a decrease in received SNR (Signal to Noise power Ratio).
The technique described in Patent Document 1 can reduce the propagation loss by changing the electronic component provided in the antenna and lowering the resonance frequency. However, the technique described in Patent Document 1 has a problem in that the antenna gain is reduced because the antenna size (resonance portion length) cannot be changed in spite of increasing the wavelength of the electromagnetic wave. .
Furthermore, since the technique described in Patent Document 1 requires a plurality of patterns to be prepared on a fixed antenna substrate according to the number of resonance frequencies to be switched, the resonance frequency according to the distance between the wireless module and the AP. There was a problem of lack of flexibility when changing.

  The present invention has been made to solve such problems, and a wireless device, a wireless system, and a printing that can suppress a decrease in propagation loss due to an increase in propagation distance without changing the antenna gain. An object is to provide an apparatus and an automatic transaction apparatus.

A radio apparatus according to the present invention includes an antenna having a resonance unit and a radio module that feeds a high-frequency signal to the antenna, and performs radio communication with an access point, and the radio module is arranged in the axial direction of the antenna. It is configured to be movable, and by moving the wireless module, the length of the resonance unit is changed without changing the total length of the antenna, and the access point extends from the tip of the antenna to the axis of the antenna. The distance between the wireless module and the access point is changed by moving the wireless module apart from each other in the vertical direction, and the antenna is located at a position where the wireless module is close to the access point. When moving to, the length of the resonating portion is shortened, and the wireless module is connected to the access point. When moving to a position far from the position, the length of the resonance unit is increased, and the wireless module performs feedback control on the carrier frequency of the high-frequency signal so as to minimize the voltage standing wave ratio. In addition, the carrier frequency of the high-frequency signal is increased by shortening the length of the resonance part, and the carrier frequency of the high-frequency signal is lowered by increasing the length of the resonance part .
In addition, the wireless system of the present invention includes an antenna having a resonance unit, a wireless module that is provided so as to be movable in the axial direction of the antenna, and that supplies a high-frequency signal, and an access point that performs wireless communication between the wireless module A control unit configured to control the wireless unit to change the length of the resonance unit without changing the total length of the antenna according to the position of the wireless module, The module is characterized in that the carrier frequency of the high-frequency signal is feedback-controlled so as to minimize the voltage standing wave ratio.

  The propagation loss increases as the propagation distance increases and increases as the carrier frequency increases. That is, an increase in propagation loss can be supplemented by a decrease in carrier frequency. When the carrier frequency (resonance frequency) is lowered, the resonance part needs to be lengthened, but the gain of the inverted F-type antenna is substantially constant at the resonance frequency regardless of the length of the resonance part (resonance length). is there. Therefore, according to the present invention, an increase in propagation loss due to an increase in propagation distance can be reduced without changing the antenna gain.

  According to the present invention, it is possible to suppress a decrease in propagation loss due to an increase in propagation distance without changing the antenna gain.

It is a block diagram of the radio | wireless apparatus which is 1st Embodiment of this invention. It is a flowchart which shows the radio | wireless transmission procedure from a radio | wireless module to an access point. It is a block diagram of the radio | wireless system which is 1st Embodiment of this invention. It is a block diagram of a printing apparatus and the automatic transaction apparatus provided with this printing apparatus. It is the side view and top view of a printing apparatus. It is a block diagram of an inverted F-type antenna having N resonance positions. It is a figure which shows the state of the resonance frequency switching movable part in case a wireless module exists in the resonance position 1. FIG. It is a figure which shows the state of the resonance frequency switching movable part in case a wireless module exists in the resonance position N. FIG. It is a figure which shows the reflective characteristic between an antenna and a radio | wireless module. It is the figure which showed the propagation loss between an access point and a radio | wireless module. It is the printed circuit board pattern figure used for the characteristic simulation of a planar inverted F antenna. It is a characteristic view which shows the antenna gain with respect to a carrier frequency. It is a block diagram of the printing apparatus as a comparative example.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. Each figure is only schematically shown so that the present invention can be fully understood. Moreover, in each figure, the same code | symbol is attached | subjected about the common component and the same component, and those overlapping description is abbreviate | omitted.

(First embodiment)
FIG. 1 is a configuration diagram of a radio apparatus according to the first embodiment of the present invention.
The wireless device 250 includes an antenna (inverted F-type antenna) 101 and a wireless module 201 having a sensor unit 205, and performs wireless communication with an access point (AP). The wireless device 250 is configured such that the antenna 101 is fixed and the wireless module 201 as an oscillator reciprocates on a shaft 301 that is disposed in parallel along the axial direction of the antenna 101.

(Antenna 101)
The antenna 101 includes a printed circuit board 103, a resonance frequency switching movable portion 108, and power feeding pattern switching movable portions 109 and 110. The printed circuit board 103 includes a resonance determining copper foil pattern 102 and a power feeding copper foil pattern for high resonance frequency. 104, a short-circuit copper foil pattern 105 for a high resonance frequency, an L-shaped feeding copper foil pattern 106 for a low resonance frequency, and an L-shaped short-circuit copper foil pattern 107 for a low resonance frequency are formed. The tip of the short resonance copper foil pattern 107 for low resonance frequency is connected to the bent portion of the power supply copper foil pattern 106 for low resonance frequency.

  In the antenna 101, at a low resonance frequency, the axial portion of the short resonance copper foil pattern 107 for the low resonance frequency, the axial portion of the feeding copper foil pattern 106 for the low resonance frequency, and the resonance determining copper foil pattern 102 are resonated. In the high resonance frequency, only the resonance-determining copper foil pattern 102 constitutes the resonance part. That is, the antenna 101 is configured such that the length (resonance length) of the resonance part in which resonance is performed is changed without changing the overall length. In FIG. 1, two resonance positions are described, but actually, there are N resonance positions as shown in FIG. 6.

  The antenna 101 is a so-called inverted F-type antenna, and a short resonance copper foil pattern 107 for low resonance frequency and a short copper foil pattern 105 for high resonance frequency constitute a short circuit portion, and power supply for low resonance frequency is provided. The distance between the copper foil pattern 106 and the power supply copper foil pattern 104 for the high resonance frequency is set in advance to achieve matching.

  The resonance frequency switching movable part 108 and the power feeding pattern switching movable parts 109 and 110 are mechanical switches such as a micro switch and a reed switch, for example, and the antenna movable part drive mechanism 304 (FIG. 4) or the like outside the antenna. , A control unit (AP) 305 (FIG. 4)) is provided so that the mechanical switch can be controlled ON / OFF. The resonance part when the resonance frequency switching movable part 108 is turned ON / OFF has a common tip part (open end) due to the resonance determining copper foil pattern 102. In addition, these movable parts are not limited to mechanical switches, For example, electronic switches, such as a transistor, may be sufficient.

(Wireless module 201)
The radio module 201 includes a radio signal power supply unit 202, a ground plane copper foil unit 203, a packet generation unit 204, a sensor unit 205, and a carrier frequency specifying unit 206, and is mounted on a printed circuit board.

  The wireless signal feeder 202 is a component that feeds a high-frequency signal (high-frequency power) with a carrier frequency of 0.3 to 6 GHz to the antenna 101, and measures the voltage amplitude of the reflected wave from the antenna 101 and the voltage amplitude of the traveling wave. It is configured to be able to. The ground plane copper foil part 203 is one layer of a plurality of layers of copper patterns constituting the multilayer printed board, and constitutes a ground circuit. The wireless signal feeder 202 and the ground plane copper foil portion 203 are disposed close to the tips of the copper foil patterns 106, 107 and 104, 105 of the antenna 101, and are connected in high frequency.

  The sensor unit 205 is a sensor that detects analog amounts and digital amounts such as pressure, temperature, and acceleration, and delivers detection data to the packet generation unit 204. The packet generation unit 204 is a component that packetizes detection information (sensor information) detected by the sensor unit 205 and passes the packet to the wireless signal power supply unit 202.

  The carrier frequency specifying unit 206 specifies the resonance frequency (carrier frequency) of the antenna 101 and passes it to the wireless signal power supply unit 202 without obtaining position information from the outside even when the wireless module 201 is reciprocating. It is. For example, the carrier frequency specifying unit 206 uses the voltage amplitude of the traveling wave output from the wireless signal power supply unit 202 to the antenna 101 and the voltage amplitude of the reflected wave reflected from the antenna 101 to determine the voltage standing wave ratio (VSWR). : Voltage Standing Wave Ratio) is calculated, and the carrier frequency is feedback-controlled so that the calculated value is minimized. Note that the packet generation unit 204 and the carrier frequency specifying unit 206 realize functions by a CPU (Central Processing Unit) as a control unit executing a program.

FIG. 2 is a flowchart showing a wireless transmission procedure from the wireless module to the access point.
In the wireless module 201, the sensor unit 205 acquires sensor information (S2), and converts the sensor information acquired by the packet generation unit 204 into a packet (S4). In the wireless module 201, the carrier frequency specifying unit 206 specifies the carrier frequency (S6), and the wireless signal power supply unit 202 supplies the packetized wireless power (high frequency signal, wireless signal) to the antenna 101 (S8). At this time, the carrier frequency specifying unit 206 outputs a minute high frequency power to the wireless signal power supply unit 202, calculates the VSWR, and determines the carrier frequency so that the calculated VSWR becomes the minimum value. Then, the process returns to the process of S2, and the power supply of the wireless packet is repeated until it is stopped by the interrupt process. The radio signal transmitted from the antenna 101 is received by the antenna of the access point AP through the radio propagation path (S10), and the access point AP decodes the sensor information from the radio signal of the received packet (S12). Sensor information is acquired (S14).

FIG. 3 is a configuration diagram of the wireless system according to the first embodiment of the present invention, and shows the arrangement relationship of the antenna, the wireless module, and the access point AP inside the metal casing.
A printing apparatus (image forming apparatus) is assumed as a wireless system. In FIG. 3, a printing apparatus 1000 includes a metal casing, a printing unit, and a control unit 305. The printing unit includes the antenna 101, the shaft 301, the print header 302, and the like (FIG. 4). The wireless module 201 is attached to the print header 302 (see FIG. 5). The control unit 305 controls the print header 302 and functions as the access point AP described above. The control unit 305 is disposed behind the front end of the antenna 101.

  3A shows a case where the distance between the wireless module 201 and the AP is long, and FIG. 3B shows a case where the distance between the wireless module 201 and the access point AP is short. Yes. 3A shows a state in which the print header 302 and the wireless module 201 have moved to one end of the antenna 101, and FIG. 3B shows that the print header 302 and the wireless module 201 have moved. The state which moved to the other edge part of the antenna 101 is shown.

  In the state of FIG. 3A, the distance between the midpoint position of the antenna resonance portion and the access point AP is the low-resonance frequency feeding copper foil pattern 106 (FIG. 1) and the resonance-determining copper foil pattern 102 ( This is the distance between the midpoint position of FIG. 1) and the access point AP, and this distance is long. In the state of FIG. 3B, the distance between the midpoint position of the antenna resonance portion and the access point AP is the distance between the midpoint position of the resonance determining copper foil pattern 102 and the access point AP. This distance is getting shorter. That is, the propagation loss is larger in the state of FIG. 3A than in the state of FIG. Note that this propagation loss includes not only the effect of distance but also the effect of metal objects inside the device.

FIG. 4 is a configuration diagram of a printing apparatus and an automatic transaction apparatus including the printing apparatus.
The automatic transaction apparatus 2000 includes a printing apparatus 1000 that prints on a medium such as a passbook, a cash deposit / withdrawal unit 510, a card information reading unit 520 that reads personal information stored in a magnetic card or an IC card, and an input display unit 530. , And a main control unit 550 for controlling them.

  As described above, the printing apparatus 1000 includes the wireless device 250, the printing unit, and the control unit (AP) 305. The wireless device 250 includes the antenna 101 and the wireless module 201. The printing unit includes the shaft 301. A print header 302, a medium transport mechanism 303, and an antenna movable part drive mechanism 304. The antenna movable part drive mechanism 304 is an actuator that switches ON / OFF of the mechanical switches of the movable parts 108, 109, and 110 of the antenna 101.

  The antenna movable unit drive mechanism 304 is controlled by a control unit (AP) 305 and is controlled in synchronization with the reciprocating movement of the print header 302. As means for synchronizing with the movement of the print header 302, for example, a pulse motor is used as a drive source for driving the print header 302, and the number of pulses for driving the pulse motor is counted by measuring the number of rotations of the pulse motor. By doing so, the position of the print header 302 can be grasped. Thereby, the movable parts 108, 109, and 110 suitable for the position of the print header can be switched. The antenna movable portion drive mechanism 304 can also be mechanically configured to drive the movable portions 108, 109, and 110 ON / OFF as the print header 302 reciprocates. In particular, this mechanical configuration is useful when the length of the antenna 101 is several centimeters and the resonance positions are about two or three.

5A and 5B are a side view and a plan view of the printing apparatus, in which FIG. 5A is a side view and FIG. 5B is a plan view.
The medium transport mechanism 303 includes a plurality of roller pairs along the transport path. The shaft 301 is provided below the print header 302 and reciprocates in the direction perpendicular to the medium conveyance direction (main scanning direction) within the medium conveyance plane by a driving source (not shown). Yes. The print header 302 is a printing mechanism that prints on a medium such as a passbook, and prints characters and numbers sequentially by reciprocating in the direction perpendicular to the medium conveyance direction within the medium conveyance surface. The medium transport mechanism 303 transports a medium such as a passbook inserted into the medium insertion slot to the print header 302 along the side frame, and discharges the medium after printing.

  The wireless module 201 is disposed above the print header 302 and reciprocates in the main scanning direction together with the print header 302. The antenna 101 is disposed in the vicinity of the print header 302, is disposed in the medium conveyance surface, is oriented in a direction perpendicular to the medium conveyance direction, and is adjacent to the wireless module 201.

  The wireless module 201 of the printing apparatus 1000 packetizes the print state information data and the surrounding environment information data acquired by the sensor unit 205 (FIG. 1), and performs wireless communication to the control unit (AP) 305 and the main control unit 550 with low delay. Send. That is, by using the radio apparatus 250, the reception SNR (Signal to Noise Ratio) in the control unit (AP) is increased, and more stable radio communication is possible than in the conventional technique.

FIG. 6 is a configuration diagram of an inverted F-type antenna having N resonance positions.
1 and 3, for convenience of explanation, there are two resonance positions. However, the antenna 101 used in this embodiment has a copper foil pattern set for feeding and short-circuiting at the maximum N resonance positions. It is prepared and gives flexibility in changing the resonance frequency.
The antenna 101 has N resonance positions 1, 2,... (N-1), N, and a feeding copper foil pattern and a short-circuiting copper foil pattern are provided corresponding to each resonance position. The wireless module 201 (FIGS. 1 and 3) is close to any one of the power supply copper foil pattern and the short-circuit copper foil pattern. As a result, the wireless module 201 is connected to either the power feeding copper foil pattern or the short-circuiting copper foil pattern at high frequency.

(Description of antenna operation)
FIG. 7 is a diagram illustrating a state of the resonance frequency switching movable unit when the wireless module is at the resonance position 1. In FIG. 7A, the ON / OFF state of the resonance frequency switching movable unit 108 is set so that the antenna resonance unit becomes longer. That is, in the antenna 101, all the movable parts 108 are set to ON, and the power feeding pattern switching movable parts 109 and 110 are all set to OFF. FIG. 7B shows the actual appearance of the antenna 101 in the state of FIG. 7A, and the length of the resonance part is the longest. When the resonance frequency in this state is f1, the wireless module 201 transmits a wireless signal so that f1 becomes the center frequency.

  FIG. 8 is a diagram illustrating a state of the resonance frequency switching movable unit when the wireless module is at the resonance position N. In FIG. 8A, the ON / OFF states of the resonance frequency switching movable unit are set so that the length of the antenna resonance unit is the shortest. That is, in the antenna 101, only the movable portions 109N and 110N corresponding to the resonance position N are set to ON, and the movable portions 109, 110, and N corresponding to the resonance positions 1, 2,. And all the movable parts 108 are set to OFF. At this time, the movable portions 109N and 110N function as other switches that connect the wireless module 201 disposed in the vicinity of the opened switch (movable portion 108) and the power receiving end of the resonance portion. FIG. 8 (b) shows the actual appearance of the antenna with respect to FIG. 8 (a). When the resonance frequency in this state is fn, the wireless module 201 transmits a wireless signal so that fn becomes the center frequency.

  Here, in order to shorten the length of the antenna resonance part, it is considered that the length of the resonance part is changed by the movable part (switch) 108 without moving the wireless module 201. That is, by turning ON the movable part 108 without providing the high-resonance frequency feeding copper foil pattern 104 and the high-resonance frequency short-circuit copper foil pattern 105 shown in FIG. Consider shortening the resonance portion by turning off 108. For example, consider that the movable portion 108 is provided at the midpoint of the length of the resonance portion, and the movable portion 108 is turned off to resonate at a high resonance frequency that is approximately twice the low resonance frequency.

  In this case, the antenna current distribution is very small in the vicinity of the movable portion 108, so the presence or absence of the movable portion 108 does not affect the function. In other words, the phase of the electromagnetic wave is canceled out by the resonance part on the tip side of the movable part 108 and does not function as an antenna as a whole. For this reason, as shown in FIG. 3B and FIG. 8, it is preferable that the movable portion 108 be in an OFF state where the impedance near the shorted copper foil pattern 105 is low. In other words, it is preferable that the resonance part of the antenna 101 has a common tip part (open end) when the movable part 108 is short-circuited and when the movable part 108 is opened.

(Function and effect)
FIG. 9 is a diagram showing the reflection characteristics between the antenna and the wireless module, and shows the reflection characteristics at the resonance positions 1,...
The resonance frequency when the wireless module 201 is arranged at the resonance position 1 is f1, and the resonance frequency when the wireless module 201 is moved to the resonance position N is fn. The antenna 101 resonates at a carrier frequency f1 that is lower than the resonance frequency fn because the resonance position 1 has a longer resonance portion than the resonance position N. The reflection characteristic has a low reflectance when the carrier frequency of the wireless module 201 matches the resonance frequency, but has a high reflectance when the carrier frequency deviates from the resonance frequency.

  Since the antenna 101 has N resonance positions, there are N resonance frequencies. In this case, the carrier frequency specifying unit 206 selects resonance frequencies f1,..., Fn that minimize the voltage standing wave ratio (VSWR).

FIG. 10 is a diagram illustrating propagation loss with respect to the transmission distance between the access point and the wireless module.
In FIG. 10, the solid line indicates the case where the carrier frequency (resonance frequency) is f1, and the broken line indicates the case where the carrier frequency (resonance frequency) is fn. The effect of this antenna system is shown using this figure.
In general, the propagation loss L (d, f) [dB] in free space is
L (d, f) = 32.44 + 20 log ₁₀ (f) +20 log ₁₀ (d)
Given in. Here, d [km] is a transmission distance, and f [MHz] is a carrier frequency. The propagation loss increases with the transmission distance, and further increases as the carrier frequency is higher.
In the case of not the free space but inside the housing, there is a shielding object such as metal and the electromagnetic wave path is blocked, so that the propagation loss may be about 20 dB higher than the theoretical value.

  The propagation loss in the case of the distance d1 between the access point AP and the resonance position 1 and the carrier frequency fn is Loss (d1, fn). The propagation loss in the case of the distance dn between the access point AP and the resonance position N and the carrier frequency fn is Loss (dn, fn). Comparing Loss (d1, fn) and Loss (dn, fn), Loss (d1, fn) is significantly larger than Loss (dn, fn).

  Here, in the resonance position 1 of the antenna 101, the wireless device 250 sets the resonance frequency and the carrier frequency to be low and sets it to f1. The propagation loss Loss (d1, f1) can be smaller than Loss (d1, fn), and can be close to Loss (dn, fn). According to the wireless device 250, since the propagation loss is small, the high frequency signal transmitted from the resonance position 1 can achieve a high reception SNR at the access point AP.

FIG. 11 is a printed circuit board pattern diagram made of glass epoxy (FR4) used for the characteristic simulation of the planar inverted F antenna. The printed circuit board may be anything as long as it uses an insulating substrate, even if it is not made of glass epoxy.
In this characteristic simulation, a printed circuit board having a size of 60 mm square is arranged in the XY plane, and a solid substrate is grounded (GND) except for the inverted F portion. In this characteristic simulation, the length of the antenna resonance portion is L [mm], the copper foil length of the short-circuit portion is H [mm], the distance between the short-circuit portion and the feeding portion is S [mm], and the frequency [GHz] Then, the voltage reflection coefficient S11 and the maximum gain (dBi) of each surface (XY plane, YZ plane, ZX plane) are calculated.

  Here, the voltage reflection coefficient S11 is an element of the scattering matrix, and the unit of gain “dBi” indicates an isotropic gain. An isotropic antenna that is a reference for gain is a virtual ideal antenna (isotropic antenna) whose directivity is a perfect sphere when viewed three-dimensionally.

When the length L of the antenna resonance portion is short (L = 18.3 mm), the voltage reflection coefficient S11 is small (−36.99 dB) at a high frequency (2.45 GHz), and the gain is also high (0.52 to 2.2. 36 dBi). Further, when the length L of the antenna resonance portion is long (L = 53.57 mm), the voltage reflection coefficient S11 is small (S11 = −19.64 dB) at a low frequency (0.92 GHz), and the gain is high (−4 dBi). degree). That is, the gain of the inverted F-type antenna is the same at each resonance frequency regardless of whether the length L of the resonance part is short or long.

FIG. 12 is a characteristic diagram showing the antenna gain with respect to the carrier frequency.
A solid line is a characteristic that can be expected in the present embodiment, and a broken line is a characteristic that is assumed in the prior art. When the resonance frequency is lowered by changing the electronic component, which is a conventional technique, the antenna gain is lowered because the antenna length is less than the length required at the low carrier frequency. On the other hand, when the resonance frequency is set low in the present embodiment, the length required at the carrier frequency with a low antenna length can be sufficiently satisfied, so that a decrease in antenna gain can be prevented.

(Comparative example)
In the printing apparatus 1000 of FIG. 3, the control unit 305 is disposed behind the tip of the antenna 101. Here, consider a case where the control unit (AP) 305 is disposed not behind the tip of the antenna 101 but behind the short-circuit copper foil pattern 107 for low resonance frequency.
FIG. 13 is a configuration diagram of a printing apparatus as a comparative example. In the printing apparatus 1000B, the distance between the midpoint position of the antenna resonance unit and the control unit (AP) 305B is shorter in the state of FIG. 13A than in the state of FIG. 13B. That is, the state of FIG. 13A is a state in which the propagation loss is most reduced because the propagation distance is short and the resonance frequency (carrier frequency) is also low. On the other hand, the state of FIG. 13A is a state in which the propagation loss is doubled because the propagation distance is long and the resonance frequency (carrier frequency) is also high. That is, the above embodiment is based on the premise that the antenna of the control unit (AP) 305 is disposed behind the tip of the antenna 101.

(Modification)
The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the gist of the present invention. For example, the following modifications are possible.
(1) The radio apparatus 250 of the above embodiment has been described on the assumption of an inverted F-type antenna, but may be an inverted L-type antenna or a λ / 4 dipole antenna. Further, when the power is fed at the midpoint position of the antenna due to the movement of the wireless module 201, a copper foil pattern or a movable part can be arranged so as to be a T-type antenna (λ / 2 dipole antenna). .
(2) In the above embodiment, the antenna 101 is fixed to the housing and the wireless module 201 is moved. However, the antenna 101 can be moved by fixing the wireless module 201 to the housing. That is, the relative position between the antenna 101 and the wireless module 201 changes.

101 Antenna (Inverted F type antenna)
DESCRIPTION OF SYMBOLS 102 Resonance determination copper foil pattern 103 Printed circuit board 104 Power supply copper foil pattern for high resonance frequency 105 Short circuit copper foil pattern for high resonance frequency 106 Power supply copper foil pattern for low resonance frequency 107 Short circuit copper foil pattern for low resonance frequency 108 Resonant frequency switching movable part (switch)
109,110 Movable part for power supply pattern switching (other switches)
201 Wireless module (oscillator)
Reference Signs List 202 wireless signal power supply unit 203 ground plane copper foil unit 204 packet generation unit 205 sensor unit 206 carrier frequency identification unit 250 wireless device 301 shaft 302 print header 303 medium conveyance mechanism 304 antenna movable unit drive mechanism 305 control unit (AP)
510 cash deposit / withdrawal unit 520 card information reading unit 530 input display unit 550 main control unit 1000 printing apparatus 2000 automatic transaction apparatus 1, 2,..., N-1, N resonance position

Claims (9)

A wireless device comprising an antenna having a resonance unit and a wireless module for feeding a high-frequency signal to the antenna, and performing wireless communication with an access point,
The wireless module is configured to be movable in the axial direction of the antenna,
By moving the wireless module, the length of the resonance unit is changed without changing the overall length of the antenna ,
The access point is disposed away from the tip of the antenna in a direction perpendicular to the axis of the antenna,
When the wireless module is moved, the distance between the wireless module and the access point changes,
The antenna is configured such that when the wireless module moves to a position closer to the access point, the length of the resonating unit becomes shorter, and when the wireless module moves to a position farther from the access point, It is configured to be long,
The wireless module is
Feedback control of the carrier frequency of the high frequency signal to minimize the voltage standing wave ratio,
Increasing the carrier frequency by shortening the length of the resonance part,
The carrier frequency is lowered by increasing the length of the resonance part.
No line and wherein the. The wireless device according to claim 1 ,
1. The wireless device according to claim 1, wherein one or more switches are provided in the resonance unit, and the length of the resonance unit can be changed by switching the switch. The wireless device according to claim 2 ,
Before Symbol wireless module is disposed in the vicinity of the opened said switch, wireless device characterized by supplying power to the resonance unit length changes. A wireless device according to claim 2 or claim 3 , wherein
The wireless device according to claim 1, wherein the resonance unit has a common tip when either one of the one or the plurality of switches is short-circuited and when the switch is opened. A wireless device according to any one of claims 2 to 4 ,
Providing another switch for connecting the wireless module arranged in the vicinity of the opened switch and the other end of the resonance unit;
The other switch is opened when the switch is short-circuited. A wireless device according to any one of claims 1 to 5 ,
The radio apparatus according to claim 1, wherein the antenna is an inverted F-type antenna. A wireless system including an antenna having a resonance unit, a wireless module that is movable in the axial direction of the antenna, and that feeds a high-frequency signal, and a control unit as an access point that performs wireless communication with the wireless module Because
The wireless module is configured to be movable in the axial direction of the antenna,
The axial movement of the wireless module changes the length of the resonance part without changing the overall length of the antenna ,
The access point is disposed away from the tip of the antenna in a direction perpendicular to the axis of the antenna,
When the wireless module is moved, the distance between the wireless module and the access point changes,
When the wireless module moves to a position closer to the access point, the length of the resonance section becomes shorter, and when the wireless module moves to a position farther from the access point, the length of the resonance section becomes longer. Become
The wireless module is
Feedback control of the carrier frequency of the high frequency signal to minimize the voltage standing wave ratio,
Increasing the carrier frequency by shortening the length of the resonance part,
The wireless system , wherein the carrier frequency is lowered by increasing the length of the resonance part . A wireless system including an antenna having a resonance unit, a wireless module that is movable in the axial direction of the antenna, and that feeds a high-frequency signal, and a control unit as an access point that performs wireless communication with the wireless module Because
  The control unit controls to change the length of the resonance unit without changing the overall length of the antenna according to the position of the wireless module,
  The wireless module performs feedback control on the carrier frequency of the high-frequency signal so as to minimize the voltage standing wave ratio.
A wireless system characterized by that. An automatic transaction apparatus comprising the wireless apparatus according to claim 1 .

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