Radio

Abstract

To provide a radio that has a high frequency antenna dedicated to receiving another high frequency signal having a higher frequency than a radio operation frequency, and simplify the layout of the high frequency antenna.SOLUTION: In a small-size radio, in an upper part of a housing having a relatively good radio wave state, an antenna for a radio operation frequency is arranged, and a volume and a channel switching knob 13 for selecting radio channels are arranged to improve operability. In proximity to these, in arrangement of a GPS antenna, a GND terminal (COM) of a rotary encoder 131 rotationally operated with the channel switching knob 13 is grounded through a resistor R3, and terminals A, B performs output through resistors R12, R22. Thus, these impedance elements increase the impedance of the encoder 131 from GND, and even if the GPS antenna is arranged in proximity, its influence can be prevented. The radio can thus be reduced in size.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a radio, particularly one that is portable and has a dedicated radio frequency antenna for receiving other radio frequency signals higher than the radio's operating frequency. [Background technology]

[0002] Specifically, the above-mentioned radio device is realized as a radio device that operates at frequencies such as the VHF or UHF band, has a dedicated high-frequency antenna for receiving other high-frequency signals higher than the operating frequency, such as GNSS (Global Navigation Satellite System) signals such as GPS (Global Positioning System), and transmits location information at predetermined intervals in addition to voice and data.

[0003] The dedicated high-frequency antenna is preferably placed in a position where there is no obstruction between it and the satellite. Therefore, for example, in the case of a portable radio, if the dedicated high-frequency antenna is placed so as to protrude from the top surface of the radio's housing, it can be operated with good antenna sensitivity. However, the top surface of the radio's housing is provided with an antenna for the radio operating frequency, a volume knob for adjusting the volume, a channel switching knob for selecting the radio channel, and the like, and there is a case where there is no space to place the dedicated high-frequency antenna. In that case, it is possible to place the dedicated high-frequency antenna by bulging the upper side of the front, back, or side of the radio's housing.

[0004] However, such a case is not desirable from the viewpoint of design. Therefore, the dedicated high-frequency antenna is generally provided in an empty space inside the housing of the radio. However, in this case, if the dedicated high-frequency antenna is placed near a large component close to the ground (GND) potential, such as a rotary encoder rotated by the channel switching knob or an eccentric motor for vibration, the tuning frequency of the high-frequency antenna will be shifted, and good reception sensitivity will not be obtained. Therefore, it will be troublesome to readjust the tuning frequency of the GNSS antenna.

[0005] Therefore, Patent Document 1 shows that the knob portion of the rotary encoder is made of hollow resin, and a fixed helical antenna for GPS is installed inside, so that the GPS signal is received at the top of the housing, where the gain is large. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4893266 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-mentioned conventional technology, a special rotary encoder must be created, and if the rotating shaft is made of metal, the base end (lower end) of the helical antenna will be close to GND, and it is unclear whether a sufficient effect will be obtained.

[0008] An object of the present invention is to provide a radio device in which a high frequency antenna can be disposed in close proximity to a component that has a potential close to the ground potential. [Means for solving the problem]

[0009] The radio device of the present invention is characterized in that, in a radio device having a dedicated high-frequency antenna for receiving another high-frequency signal higher than the radio operating frequency, when the high-frequency antenna is placed in close proximity to a component performing a predetermined function that is at least temporarily at a potential close to ground (GND) potential in an operating or stopped state, the radio device is provided with an impedance element that relatively maintains the component close to ground potential at a low impedance when performing the predetermined function, and changes the impedance from the ground (GND) potential to a high impedance in the band of the high-frequency signal.

[0010] For example, in a radio device that operates at frequencies such as the VHF or UHF band and has a dedicated high-frequency antenna for receiving a different high-frequency signal that is higher than the operating frequency, such as a GNSS signal, the antenna for the radio operating frequency is of a size necessary for transmitting and receiving voice and data, and is often installed exposed to the outside, such as on the top of the radio device, where the radio wave conditions are thought to be the best.

[0011] On the other hand, when a dedicated high-frequency antenna is provided for receiving a different high-frequency signal higher than the radio operating frequency, the antenna is provided for an additional function, is for a higher frequency, is miniaturized, and is often placed inside the housing of the radio. However, if the dedicated antenna is placed close to a component that performs a predetermined function and is close to the ground (GND) potential, the tuning frequency may shift.

[0012] Therefore, in the present invention, an impedance element is interposed between the part that exhibits the predetermined function and the ground (GND) potential, and the impedance element is relatively low when the part that exhibits the predetermined function exhibits its function, that is, in the DC or low frequency region. Detectable in or controllable from a controller The impedance is kept low, and the ground potential is kept low in the high frequency band. Floating Set to high impedance.

[0013] Therefore, it is possible to prevent the component that performs the predetermined function from affecting the high frequency signal in the band of the high frequency signal without impairing the original function of the component. This allows the high frequency antenna to be disposed close to the component that performs the predetermined function, and the radio device can be made smaller. In addition, since there is no need to bulge the housing of the radio device in order to dispose the high frequency antenna, an exterior design with good designability can be designed.

[0014] In addition, in the radio device of the present invention, the component close to the ground (GND) potential is a rotary encoder having a ground terminal for selecting a radio channel, and the high-frequency antenna is an antenna for GNSS.

[0015] According to the above configuration, since GNSS signals such as GPS are relatively high frequency, therefore have short wavelengths, and are weak, if a component close to the ground (GND) potential is present near the high frequency antenna that receives the signal, a deviation in the tuning frequency occurs. On the other hand, such a GNSS antenna is preferably provided on the top of the radio where it is easy to receive the signal, and the top is provided with a volume knob and the like as well as a channel switching knob for selecting a radio channel, and the channel switching knob rotates a rotary encoder.

[0016] Therefore, even in a position where the influence of a rotary encoder would occur, the influence of the rotary encoder can be suppressed, making it easier to arrange a high-frequency antenna for GNSS.

[0017] Furthermore, in the radio device of the present invention, the impedance element is a resistor interposed between each terminal of the rotary encoder.

[0018] According to the above configuration, a resistor is interposed between the ground (GND) terminal of the rotary encoder and the GND of the internal circuit board, or at the output end.

[0019] Therefore, the rotary encoder is raised from other circuit components via the resistor, and for example, the potential of the ground (GND) terminal of the rotary encoder becomes slightly higher than the ground (GND) potential of the internal circuit board. As a result, although there is no effect on the output of the encoder pulse, each terminal of the rotary encoder becomes high impedance for high frequency signals. In this way, the effect of the rotary encoder on the high frequency antenna can be reduced with a low-cost configuration.

[0020] In addition, in the wireless device of the present invention, the component close to the ground (GND) potential is an eccentric motor for vibration with an armature grounded, and the high frequency antenna is an antenna for a mobile phone line.

[0021] According to the above configuration, the signal of the mobile phone line is relatively high frequency, therefore has a short wavelength, and is weak, so if a part close to the ground (GND) potential is present near the high frequency antenna that receives the signal, a deviation in the tuning frequency occurs. On the other hand, an eccentric motor for vibration is relatively large, and requires ingenuity in its layout. Even if the metal parts such as the casing, rotating shaft, and weight are insulated from the GND, it is a simple DC motor, so one end of the armature is grounded and the other end is energized to rotate. Therefore, the impedance element is inserted to make the armature high impedance from the GND.

[0022] Therefore, it is possible to easily arrange a high-frequency antenna for a mobile phone line in the vicinity of the eccentric motor for vibration.

[0023] Furthermore, in the wireless device of the present invention, the impedance element is a ferrite bead or an inductance (coil) interposed between both positive and negative terminals of the eccentric motor for vibration.

[0024] According to the above configuration, when ferrite beads or inductance (coil) are inserted between the positive and negative terminals of the eccentric motor for vibration, they become lossless and have low impedance for the direct current used to generate vibration, and have high impedance for the high frequency signal for the high frequency antenna.

[0025] Therefore, the effect on the high frequency antenna of the eccentric motor for vibration can be reduced by using a low-cost configuration of ferrite beads or inductance (coil). Effect of the Invention

[0026] As described above, in a radio device of the present invention having a dedicated high-frequency antenna for receiving another high-frequency signal higher than the radio operating frequency, when the high-frequency antenna is placed adjacent to a component performing a predetermined function that is at a potential close to ground (GND) potential at least temporarily in an operating or stopped state, an impedance element is provided which maintains the component close to ground potential at a relatively low impedance when performing the predetermined function and raises the impedance from GND to a high impedance in the band of the high-frequency signal.

[0027] Therefore, without impairing the original function of the component that performs the predetermined function, it is possible to prevent the component from affecting the high-frequency signal in the high-frequency signal band, and the component can be placed close to the high-frequency antenna, making it possible to miniaturize the radio device. [Brief description of the drawings]

[0028] [Figure 1] 1 is a perspective view of a radio device according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 2 is a front view showing the inside of the radio device, divided into two parts, a front and a rear part. [Figure 4] FIG. 4 is a diagram showing the surface of the substrate opposite to that shown in FIG. [Diagram 5]FIG. 5 is an enlarged view of a portion of FIG. 4. [Figure 6] 2 is a block diagram showing a circuit configuration around a rotary encoder of the radio device; FIG. [Figure 7] FIG. 4 is an output waveform diagram of the rotary encoder. [Figure 8] 4 is a block diagram showing a circuit configuration around an eccentric motor for vibration of the wireless device; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] FIG. 1 is a perspective view of a radio 1 according to an embodiment of the present invention, and FIG. 2 is a plan view. The radio 1 is a device capable of digital communication using VHF and UHF bands and LTE lines of mobile phones, but the operating frequency band of the radio and whether it is digital or analog are not important in the present invention. As shown in the figure, it is preferably a handy type (small) radio that receives another high-frequency signal higher than the operating frequency band, such as a GPS signal or a signal of a mobile phone line in this example. The GPS signal is received at a predetermined cycle, for example, every second, and when starting to transmit voice or data in the operating frequency band, the immediately preceding position data is included in the signal and transmitted.

[0030] The upper part of the housing 10 of the radio 1 is provided with an antenna 11 for the operating frequency, a volume knob 12, and a channel selector knob 13 for selecting a radio channel. As shown in FIG. 2, the antenna 11 is removable at the connector 111, and can be replaced with a shorter antenna or removed and stored. At the front of the housing 10, a speaker 14 is embedded at the upper part, a display unit 16 is provided in the center, and various key switches 17 are provided at the lower part. A microphone 15 is provided adjacent to the speaker 14. Two press-to-talk switches 18 and 19 are provided on the left side of the housing 10. A clip 20 is provided on the back of the housing 10 to be inserted into the user's belt or the like and to clamp the belt between the housing 10 and the clip. A cover 101 on the right side of the housing 10 covers a connector for attaching a separate speaker / microphone in a watertight manner.

[0031] Fig. 3 is a front view showing the inside of the radio 1, divided into two halves, front and rear. The antenna 11 is removable from the connector 111, the volume knob 12 from the rotating shaft 122 of the volume 121, and the channel switching knob 13 from the rotating shaft 132 of the rotary encoder 131; Fig. 3 shows them in this state. The housing 10 is roughly divided into a front housing 102 that covers the front and upper parts, and a rear housing 103 on the rear side, and the joint between them is watertightly sealed with a sealant (not shown). The housings 102 and 103 are provided with circuit boards 3 and 4, respectively.

[0032] Fig. 4 is a diagram showing the surface of the boards 3 and 4 opposite to that shown in Fig. 3, and Fig. 5 is a diagram showing an enlarged portion of the board 4. The board 3 on the front housing 102 side is a board made up of parts similar to those of a so-called mobile phone, including a keypad 31 for the key switch 17, an LCD module 32, LTE (mobile phone line) antennas 33 and 34, a GPS antenna 35, and a Bluetooth (registered trademark) unit 36.

[0033] On the other hand, the board 4 on the rear housing 103 side is a board on which a transceiver section 41 that transmits and receives signals in the VHF and UHF bands, a logic circuit section 42 such as a modulation / demodulation IC and a controller, a SIM card slot 43 for a mobile phone, an LTE module 44, and an eccentric motor 47 for vibration are mounted. When the housings 102 and 103 are fitted together, these boards 3 and 4 are electrically connected by contacting the contacts 39 and pins 49, and the contacts 38 and pins 48, respectively. The connector 111, the volume 121, and the rotary encoder 131 are provided on the upper part of the board 4. The volume 121 is a volume with a switch that is formed by connecting a switch section 1221 and a volume section 1222 in the axial direction.

[0034] In the radio device 1 configured as described above, the radio device 1 of this embodiment has a GPS antenna 35 as a dedicated high-frequency antenna for receiving another high-frequency signal higher than the operating frequency of the antenna 11. Since the radio wave arrival direction of the GPS antenna 35 is often upward, it is desirable to provide the GPS antenna 35 as close to the upper part of the housing 10 as possible so as to avoid any obstacles. However, the connector 111 for the antenna 11 that transmits and receives signals of the operating frequency is provided at the upper part of the housing 10 where the radio wave conditions are thought to be the best, as described above, and in the radio device 1 that is carried on the shoulder or waist, large parts such as the volume control 121 and the rotary encoder 131 are arranged to improve operability, so that the space in which the GPS antenna 35 can be arranged is limited. In this embodiment, the GPS antenna 35 is provided behind the rotary encoder 131 to avoid the volume control 121, which is a thick part because it is a volume control with a switch, and the part of the connector 111 that penetrates deep into the housing 10 because it requires a strong attachment strength for the antenna 11.

[0035] However, the large components of the connector 111, the volume 121, and the rotary encoder 131 have metal components inside, and parts of them or the housing are connected to the ground (GND) potential, so that there is a wall of the GND level. Therefore, if the GPS antenna 35 is placed nearby as it is, the tuning frequency will shift, and the antenna characteristics will not be obtained (the gain will decrease), or the impedance will shift. Specifically, after the mounting of the board 4 is completed, the antenna characteristics can be improved simply by cutting the terminals of the volume 121 and the rotary encoder 131 protruding from the back surface of the board 4 short with pliers. However, such work is manual, and is an obstacle to automating the assembly process. Also, if the terminals themselves are cut short before mounting, the solder buildup will be thin, and mounting with an automatic component mounting machine will be difficult. Therefore, in the radio device 1 of this embodiment, it is important to note that an impedance element is provided at the terminal of the rotary encoder 131, which is the closest and most influential component that performs a predetermined function, to provide a high impedance that is essentially electrically isolated from the received high frequency wave of the GPS antenna 35, thereby suppressing the influence on the received high frequency wave.

[0036] 6 is a block diagram showing a circuit configuration around the rotary encoder 131. The rotary encoder 131 has three terminals, A, B, and COM. The terminal COM is grounded (connected to GND) via a resistor R3. The terminals A and B are connected to the connection points between the pull-up resistors R11 and R21 and the noise cut capacitors C1 and C2 via resistors R12 and R22, respectively, and are connected as output terminals OUT1 and OUT2 to a controller or the like consisting of a CPU (Central Processing Unit) (not shown). In the rotary encoder 131, switches are provided between the terminals A and B and the terminal COM, and when stopped, the output is maintained at a high level, and when rotating, these switches are periodically turned ON / OFF, and pulses including information on the rotation direction, which will be described later, are output from the terminals A and B and input to the controller or the like.

[0037] It should be noted that in the radio device 1 of this embodiment, the terminal COM is usually directly grounded (connected to GND), but is grounded via the resistor R3, which is the impedance element. Also, the terminals A and B are pulled up by the resistors R11 and R21, which are impedance elements. With this configuration, the low level of the pulses output from the terminals A and B when the rotary encoder 131 rotates is floating above the ground (GND) potential of the substrate 4. Also, when the rotary encoder 131 outputs a low level while stopped (not operating), the low level is floating above the ground (GND) potential. In this way, the influence of the rotary encoder 131 on the GPS antenna 35 is reduced.

[0038] Here, the high level is raised by the pull-up resistors R11 and R12 by the amount that the low level is raised from the ground (GND) potential. In this way, the difference between the low level and the high level is kept to a level that can be distinguished by a controller or the like, so that the rotation direction and rotation angle of the rotary encoder 131 are not erroneously detected.

[0039] Since the noise-cut capacitors C1 and C2 are connected to the terminals A and B, the impedance becomes low at high frequencies and close to ground. Therefore, the terminals A and B of the rotary encoder 131 are connected to the output terminals OUT1 and OUT2 via the resistors R12 and R22. Even if the noise-cut capacitors C1 and C2 are not required, the input terminals of the controller, which is the output destination of the rotary encoder 131, are not necessarily high impedance at high frequencies, and considering the influence of the impedance due to the wiring to the controller, it is preferable to separate at high frequencies using the resistors R12 and R22 as described above. For example, R11, R21=100kΩ, C1, C2=47pF, R12, R22=1kΩ, and R3=1kΩ.

[0040] FIG. 7 is an output waveform diagram of the rotary encoder 131 of this embodiment. When stopped, a high or low level output is maintained from the output terminals OUT1 and OUT2, and when rotating, a pulse in which a low level and a high level signal are switched at 1 / 2 phase (50% duty) is output, and as shown by the switching at time t0, the phase of the pulse is switched to be 1 / 4 advanced or delayed depending on the direction of rotation. The rotary encoder 131 of this embodiment has 20 steps as shown in FIG. 2, and outputs 20 pulses per rotation. Here, in this embodiment, impedance elements (R11, R21, R3) are interposed between the terminals A, B, and COM as described above for the rotary encoder 131, which is a component that has electrodes, wiring, and switches inside and whose metals are at ground (GND) potential. In other words, by grounding the terminal COM via resistor R3, the low level of the signal (pulse) output from the rotary encoder 131 to the controller, etc. becomes a level floating above the ground (GND) potential, and the high level also becomes a level pulled up via resistors R11 and R21.

[0041] By configuring in this manner, when the rotary encoder 131 is caused to output high / low pulses, which are a predetermined function, resistors R3, R11, and R21 are interposed as impedance elements between the GND terminal (COM) of the rotary encoder 131 and the GND of the substrate 4, and between all of the output terminals (A, B) connected to other circuit components. Therefore, the rotary encoder 131 floats (becomes high impedance) from the other circuit components via the resistors R3, R11, and R21, and the potential of the GND terminal (COM), for example, becomes slightly (ΔV) higher than the ground (GND) potential.

[0042] As a result, when the GPS antenna 35 is disposed relatively close to the rotary encoder 131, the rotary encoder 131 is seen by the GPS antenna 35 not as a metal piece at ground level, but as a metal piece with high impedance that is not related to the ground level, and is substantially electrically isolated. Therefore, the influence of the rotary encoder 131 on the GPS antenna 35 can be suppressed (antenna performance is not significantly deteriorated). On the other hand, a pulse according to the rotation angle and rotation direction is output to the controller or the like (exercising a predetermined function), but is output so as to be detectable by the controller or the like (relatively low impedance). In this way, the GPS antenna 35 can be disposed even in the vicinity of a component that affects antenna performance, and the wireless device 1 can be made smaller. In addition, the GPS antenna 35 can be disposed inside the housing 10 of the wireless device 1, and the housing 10 of the wireless device 1 is not caused to bulge, so that an exterior design with good design can be designed.

[0043] In addition, in the radio 1 of this embodiment, since resistors are used as impedance elements, the influence of the rotary encoder 131 on the GPS antenna 35 can be reduced with a low-cost configuration. The higher the resistance value of the impedance elements (R11, R21, R3, and resistors R12 and R22 as necessary), especially the resistor R3, the more effective it is. However, if the resistance value is too high, the low level of the pulse cannot be detected by a controller or the like, so an appropriate optimum value may be selected in relation to the pull-up resistors R11 and R21. In this embodiment, the resistance value is set to 1 kΩ, which is 1 / 100 of the 100 kΩ of the pull-up resistors R11 and R21. In this case, it is possible to use coils or ferrite beads as the impedance elements, but resistors are preferable because they are easier to increase the impedance and are low cost as described above.

[0044] Furthermore, the radio device 1 of this embodiment has second LTE antennas 33, 34 as dedicated high-frequency antennas for receiving another high-frequency signal higher than the radio operating frequency of antenna 11. These LTE antennas 33, 34 are arranged orthogonal to each other in accordance with the polarization plane on the substrate 3. Of these, the LTE antenna 34 arranged on the right side faces, on the opposing substrate 4, an eccentric motor 47 for vibration (see FIGS. 4 and 5) which is relatively large and requires ingenuity in its layout.

[0045] FIG. 8 is a block diagram showing a circuit configuration around the eccentric motor 47 for vibration shown in FIG. 4 and FIG. 5. This motor 47 is a simple DC motor, and one end (negative terminal) of the armature is grounded, and the other end (positive terminal) is energized to rotate. The energization control of the motor 47 is performed by a controller or the like. The positive terminal is supplied with power from the input terminal IN through a diode D1, and a capacitor C3 for stabilizing the power supply is interposed upstream of the diode D1, and a diode D2 of reverse polarity is provided downstream of the diode D1 to absorb counter electromotive force when the motor is stopped. This motor 47 contains a magnet and the armature formed by winding a copper wire around an iron core inside a housing, and is mostly made of metal, including a weight, and when the potential of these metals approaches the ground (GND) level, it affects the nearby LTE antenna 34.

[0046] The motor 47 is soldered and fixed to the substrate 4, but when it is connected to the GND pattern of the substrate 4, it affects the LTE antenna 34. Therefore, in the wireless device 1 of this embodiment, the motor 47 is soldered to a component land dedicated to the motor 47, which is not connected to any circuit on the substrate 4, so that it is completely floating (insulated) from the GND of the substrate 4. It should be noted that ferrite beads or inductances (coils) L1, L2 are interposed between the positive and negative terminals of the motor 47 as the impedance elements.

[0047] This provides a lossless, low impedance for the direct current used to generate vibration, and metals such as the armature, rotating shaft, and weight are in a floating state from the GND level for other signals, particularly high-frequency signals transmitted and received by the LTE antenna 34. In other words, these components float in terms of impedance from the GND surface, and are essentially electrically isolated from the LTE antenna 34. In this way, they perform their predetermined functions without being affected by current control from a controller or the like, and the effect of the vibration eccentric motor 47 on the LTE antenna 34 can be suppressed. [Explanation of symbols]

[0048] 1 Radio 10. Chassis 102 Front housing 103 Rear housing 11 Antenna 111 Connector 12 Volume knob 121 Volume 122 Rotational Axis 13 Channel switching knob 131 Rotary Encoder 132 Rotational Axis 14 Speaker 15 Microphone 16 Display 17 Key Switch 18,19 Press to talk switch 20 clips 3,4 Substrate 31 Keypad 32 LCD Module 33,34 LTE antenna 35 GPS antenna 36 Bluetooth (registered trademark) unit 38,39 Contacts 41 Transceiver part 42 Logic circuit section 43 SIM card slot 47 Eccentric motor for vibration 48,49 Pin C1, C2 Noise cut capacitor C3 Capacitor D1, D2 Diode L1, L2 Ferrite beads or inductance (impedance element) R11, R21 Pull-up resistors R12, R22 Resistors (impedance elements) R3 Resistor (impedance element)

Claims

1. A dedicated high frequency antenna for receiving another high frequency signal higher than the radio operating frequency; A component that performs a predetermined function and has a potential close to the ground potential at least temporarily when in operation or stopped state; A radio having a controller, When the high frequency antenna is placed close to a component which performs a predetermined function and which at least temporarily becomes a potential close to the ground potential in an operating or stopped state, the component close to the ground potential is grounded via an impedance element, so that when the component close to the ground potential is made to perform the predetermined function, the component close to the ground potential is maintained at a low impedance which is detectable by the controller or controllable by the controller, and in the band of the high frequency signal, the component close to the ground potential is made to have a high impedance which is floated from the ground potential inside the radio device. Radio.

2. 2. The radio according to claim 1, wherein the component close to ground potential is a rotary encoder for selecting a radio channel, the impedance element is a resistor, and the high frequency antenna is an antenna for GNSS.

3. A radio as described in claim 1, characterized in that the part close to the ground potential is an eccentric motor for vibration whose armature is grounded, the impedance element is a ferrite bead or an inductance, and the high-frequency antenna is an antenna for a mobile phone line.

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