JP4064683B2 - Car radio - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle wireless device having a first wireless unit and a second wireless unit that employ different communication methods.
[0002]
[Prior art]
FIG. 5 is a diagram illustrating a configuration of a conventional in-vehicle wireless device, and FIG. 6 is a diagram for explaining an operation of the conventional in-vehicle wireless device. In FIG. 5, the in-vehicle wireless device 21 is connected to the in-vehicle antenna 22 and communicates with other mobile wireless stations 23. The in-vehicle wireless device 21 includes a wireless unit 24 that communicates with other mobile wireless stations 23, a wireless module 28, and a housing built-in antenna 29, and a wireless speaker that the driver takes out of the vehicle and uses it. The microphone 25 is connected wirelessly, and the in-vehicle printer 26 is connected by wire.
[0003]
Here, the housing of the in-vehicle wireless device 21 is covered with a metal cover 27. The wireless speaker microphone 25 that can be used outside the vehicle performs communication by way of the wireless module 28. The housing built-in antenna 29 connected to the wireless module 28 is fixed over the metal cover 27.
[0004]
As shown in FIG. 6, the voice communication between the other mobile radio station 23 and the wireless speaker microphone 25 is performed using the in-vehicle antenna 22 connected to the in-vehicle radio 21, the radio unit 24 in the in-vehicle radio 21, the in-vehicle radio 21. This is done via a housing built-in antenna 29 fixed to a metal cover 27 connected to the wireless module 28 and the communication module 28.
[0005]
[Problems to be solved by the invention]
However, in the conventional in-vehicle wireless device, since the housing built-in antenna 29 connected to the wireless module 28 is integrated with the wireless module 28, there is a problem in that interference of transmission / reception radio waves occurs. Further, since the housing built-in antenna 29 is placed in the metal cover 27 constituting the housing of the wireless unit, there is a problem that the sensitivity of radio wave transmission / reception is lowered. Furthermore, in order to connect the in-vehicle printer 26 with a wire, there is a problem that wiring work in the vehicle must be a skilled worker.
[0006]
The present invention has been made to solve the above-described conventional problems, eliminates interference of radio waves transmitted and received, improves communication sensitivity, eliminates complicated wiring work in the vehicle, and facilitates installation work. An object is to provide a radio.
[0007]
[Means for Solving the Problems]
The in-vehicle wireless device of the present invention includes a first wireless unit that communicates with another wireless station, and a second wireless unit that communicates with a dedicated device using at least one of a modulation method and a frequency different from those of the first wireless unit. The first radio unit antenna is installed outside the vehicle, and the second radio unit has a transmission antenna made of a planar antenna and a reception antenna made of a coaxial cable , One of the transmitting antenna and the receiving antenna is installed at one of the left and right ends in the casing, and the other of the transmitting antenna and the receiving antenna is installed with a distance from the other of the left and right ends in the casing. At the same time, it is made of resin and covered with an operation unit that covers the opening on the front surface of the casing .
[0008]
With this configuration, it is possible to communicate with dedicated equipment used inside and outside the car, and it is possible to eliminate complicated wiring work inside the car and facilitate installation work, and with dedicated equipment used inside and outside the car. Transmission / reception is performed with different types of antennas, a transmission antenna consisting of a planar antenna and a reception antenna consisting of a coaxial cable , and the transmission and reception antennas described above are installed at a distance, so there is no interference in transmission and reception of radio waves. In addition, there is no need for a metal enclosure for shielding radio waves, thus improving the sensitivity of communication with dedicated equipment used inside and outside the car, improving call quality and protecting the transmitting and receiving antennas from external forces. it can. Moreover, the optimal receiving state can be obtained by adjusting the length of the receiving antenna for each vehicle type or for each individual vehicle.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
(First embodiment)
FIG. 1 is a block diagram functionally showing the configurations of the in-vehicle wireless device main body and the in-vehicle wireless device according to the first embodiment of the present invention. In FIG. 1, the in-vehicle wireless device of the present invention includes a wireless speaker microphone 2 used inside and outside the vehicle, an in-vehicle printer 3 used inside and outside the vehicle, and the wireless speaker microphone 2 using a transmitting antenna 6 and a receiving antenna 7. And the wireless module 40 that communicates with the in-vehicle printer 3, the operation unit 5 that is provided on the front surface of the housing 1 and is connected to the control unit 60 that controls the in-vehicle wireless device main body 70, and the like. And a connector 31 for connecting the radio unit 50 communicating with the radio station to the transmission / reception antenna 22. The in-vehicle wireless device main body 70 includes a wireless module 40, a built-in wireless unit 50 that communicates with other wireless stations, and a control unit 60 that controls both. The wireless unit 50 includes a transmitting unit 51, a receiving unit. The wireless module 40 includes a transmission unit 41, a reception unit 42, a modulation / demodulation unit 43, and an input / output unit 44. Note that the wireless unit 50 and the wireless module 40 communicate with each other using different communication methods.
[0019]
FIG. 2 is a partially exploded perspective view showing the configuration of the in-vehicle wireless device according to the first embodiment of the present invention. 2, the in-vehicle wireless device main body 70 shown in FIG. 1 is housed in the housing 1. The in-vehicle wireless device is wirelessly connected to the wireless speaker microphone 2 and the in-vehicle printer 3, and communicates via the wireless module 40.
[0020]
Here, the transmission antenna 6 directly connected to the wireless module 40 is fixed to the right corner of the casing 1 of the in-vehicle wireless device and covered with the operation unit 5 made of resin. Similarly, the receiving antenna 7 directly connected to the wireless module 40 is fixed to the left corner of the casing 1 of the in-vehicle wireless device and covered with the operation unit 5 made of resin. Communication with other in-vehicle devices and base stations is performed via an antenna (not shown) installed outside the vehicle connected to the connector 31.
[0021]
Further, as shown in FIG. 2, the front surface of the case 1 of the in-vehicle wireless device is covered with the operation unit 5 made of resin, and the transmitting antenna 6 and the receiving antenna 7 that are formed in the case 1 Can be installed or removed independently. In this way, the transmitting antenna 6 and the receiving antenna 7 can be protected from external force, and further, a metal casing for shielding radio waves is not required. Therefore, various devices used inside and outside the vehicle, such as a wireless speaker microphone, can be used. Communication sensitivity can be improved.
[0022]
In the in-vehicle wireless device of the present invention, the wireless speaker microphone 2 and the in-vehicle printer 3 communicate with each other by two-way communication using weak radio waves, but the transmission antenna 6 is configured by a planar antenna (see FIG. 1). What is the directivity in the vertical direction with respect to the operation surface of the operation unit 5 and which is installed in the left corner of the casing 1 of the in-vehicle wireless device and the receiving antenna 7 installed in the right corner of the casing 1 of the in-vehicle wireless device? I try to keep as much distance as possible.
[0023]
Moreover, since the in-vehicle wireless device is usually installed at the center position of the driver's seat and the passenger seat of the vehicle, the radio wave radiated in the vertical direction from the operation unit 5 is reflected by each part of the vehicle body, and is a wireless speaker outside the vehicle. Communication with the microphone 2 and the printer 3 is possible, and since the reception of radio waves from the transmission antenna 6 directly to the reception antenna 7 is reduced, transmission / reception radio wave interference can be prevented.
[0024]
As described above, according to the present embodiment, transmission / reception with various devices used inside and outside the vehicle, for example, wireless speaker microphones, is performed by separate antennas, so that transmission / reception radio wave interference is eliminated. In addition, since the antenna configured in the housing is covered with a resin operation part instead of a metal lid, the sensitivity of communication with various devices used inside and outside the vehicle, such as wireless speaker microphones, is improved, and the communication quality is improved. An excellent in-vehicle wireless device can be provided.
[0025]
In addition, the transmitting antenna and receiving antenna configured in the housing can be protected from external force, and furthermore, by using an in-vehicle printer that is wirelessly connected, wiring work in the car can be eliminated and installation work can be facilitated. it can.
[0026]
The transmitting antenna 6 and the receiving antenna 7 are configured to be affixed to an appropriate location in the casing 1 of the in-vehicle wireless device with a double-sided tape, but may be fixed by screwing or the like.
[0027]
(Second Embodiment)
FIG. 3 is a partially exploded perspective view showing the configuration of the in-vehicle wireless device according to the second embodiment of the present invention. In FIG. 3, the in-vehicle wireless device main body 70 shown in FIG. 1 is housed in the housing 8. The in-vehicle wireless device is wirelessly connected to the wireless speaker microphone 9 and the in-vehicle printer (not shown), and communicates via the wireless module 10. The radio module 10 is attached with a receiving antenna 11 constituted by a coaxial cable. Moreover, the front surface of the housing 8 of the in-vehicle wireless device is covered with an operation unit 12 made of resin.
[0028]
Here, the transmission antenna 6 directly connected to the wireless module 10 is fixed to the right corner of the casing 8 of the in-vehicle wireless device, and is covered with an operation unit 12 made of resin. Similarly, the receiving antenna 11 directly connected to the wireless module 10 is fixed to the left corner of the casing 8 of the in-vehicle wireless device and covered with an operation unit 12 made of resin. Communication with other in-vehicle devices and base stations is performed via an antenna (not shown) installed outside the vehicle connected to the connector 31. The position where the transmission antenna 6 is fixed can be the left corner of the housing 8 and the position where the receiving antenna 11 is fixed can be the right corner of the housing 8.
[0029]
As described above, the configuration of the second embodiment of the present invention is basically the same as the configuration of the first embodiment except for the receiving antenna 11 configured by a coaxial cable, and thus the description of the operation is omitted. To do.
[0030]
According to the present embodiment described above, the length of the receiving antenna 11 can be freely adjusted by removing the coating of the coaxial cable, so that the communication sensitivity can be in the best state and the call quality is excellent. An in-vehicle wireless device can be provided. Further, since the receiving antenna 11 has a cable shape, the receiving antenna 11 can be arranged without being influenced by various operation buttons and connector positions on the operation unit.
[0031]
Although the radio wave reception status depends mainly on the impedance determined by the length of the receiving antenna 11, the capacitance with the surroundings changes depending on the place where the casing 8 of the in-vehicle wireless device is installed. It may not be decided. In such a case, the optimal reception state can be obtained by adjusting the length of the reception antenna 11 for each vehicle type or for each individual vehicle.
[0032]
(Third embodiment)
FIG. 4 is a partially exploded perspective view showing the configuration of the in-vehicle wireless device according to the third embodiment of the present invention. In FIG. 4, the in-vehicle wireless device main body 70 shown in FIG. 1 is housed in the housing 13. The in-vehicle wireless device is wirelessly connected to the wireless speaker microphone 14 and the in-vehicle printer (not shown), and communicates via the wireless module 15. The radio module 15 is provided with a receiving antenna 16 constituted by a coaxial cable. Moreover, the front surface of the housing 13 of the in-vehicle wireless device is covered with an operation unit 20 made of resin.
[0033]
Here, the transmitting antenna 6 directly connected to the wireless module 15 is fixed to the right corner of the casing 13 of the in-vehicle wireless device, and is covered with an operation unit 20 made of resin. Similarly, the receiving antenna 16 directly connected to the wireless module 15 is held by the antenna holder 17, while the antenna holder 17 is screwed to the housing 13 of the in-vehicle wireless device. The receiving antenna 16 is fixed to the left corner of the housing 13 of the in-vehicle wireless device by a claw 18 and a groove 19 provided in the antenna holder 17 as shown in a partially enlarged view in FIG. The operation unit 20 is covered. Communication with other in-vehicle devices and base stations is performed via an antenna (not shown) installed outside the vehicle connected to the connector 31.
[0034]
As described above, according to the present embodiment, by holding the cable-shaped receiving antenna at a fixed position, the sensitivity of communication with various devices used inside and outside the vehicle, such as a wireless speaker microphone, is improved, and the call quality is improved. An excellent in-vehicle wireless device can be provided.
[0035]
【The invention's effect】
As described above, the present invention provides a first radio unit that communicates with another radio station, and a second radio unit that communicates with a dedicated device using at least one of a modulation method and a frequency different from those of the first radio unit. The first radio unit antenna is installed outside the vehicle, and the second radio unit has a transmission antenna made of a planar antenna and a reception antenna made of a coaxial cable, One of the transmitting antenna and the receiving antenna is installed at one of the left and right ends in the casing, and the other of the transmitting antenna and the receiving antenna is installed with a distance from the other of the left and right ends in the casing. In addition, since it is made of resin and is covered with an operation part that covers the opening on the front surface of the housing, it is possible to eliminate complicated wiring work in the vehicle and facilitate installation work. A. In addition, because different types of antennas, a transmission antenna consisting of a flat antenna and a receiving antenna consisting of a coaxial cable, are installed at a distance, there is no interference in radio wave transmission and reception, and there is no need for a metal enclosure for radio wave shielding. Accordingly, the sensitivity of communication with a dedicated device used inside and outside the vehicle is improved, the call quality is excellent, and the transmitting antenna and the receiving antenna can be protected from external force. Further, there is an effect that an optimum reception state can be obtained by adjusting the length of the reception antenna for each vehicle type or for each individual vehicle.
[Brief description of the drawings]
FIG. 1 is a block diagram functionally showing a configuration of an in-vehicle wireless device main body and an in-vehicle wireless device according to a first embodiment of the present invention. FIG. 2 is an in-vehicle wireless device according to the first embodiment of the present invention. FIG. 3 is a partially exploded perspective view showing the configuration of the in-vehicle wireless device according to the second embodiment of the present invention. FIG. 4 is a partially exploded perspective view showing the configuration of the in-vehicle wireless device according to the third embodiment of the present invention. FIG. 5 is a diagram showing the configuration of a conventional in-vehicle wireless device. FIG. 6 is a diagram for explaining the operation of the conventional in-vehicle wireless device.
1, 8, 13 Case 2, 9, 14, 25 Wireless speaker microphone 3, 26 In-vehicle printer 5, 12, 20 Operation unit 6 Transmitting antenna 7, 11, 16 Receiving antenna 10, 15, 28, 40 Wireless module 17 Antenna Holder 18 Claw 19 Groove 21 Car-mounted radio 22 Car-mounted antenna 23 Radio station 24 Radio unit 27 Metal cover 29 Enclosed antenna 31 Connector 41, 51 Transmitter 42, 52 Receiver 43, 53 Modulator / demodulator 44, 54 Input / output unit 50 Radio unit 60 Control unit 70 Car radio unit

Claims (1)

An in-vehicle wireless device including a first wireless unit that communicates with another wireless station, and a second wireless unit that communicates with a dedicated device using at least one of a modulation method and a frequency different from those of the first wireless unit. And
The antenna of the first radio unit is installed outside the vehicle,
The second radio unit includes a transmission antenna composed of a planar antenna and a reception antenna composed of a coaxial cable , and one of the transmission antenna and the reception antenna is installed at one of left and right ends in the casing, and the transmission The other of the antenna and the receiving antenna is installed with a distance from the other of the left and right ends in the casing , and is covered with an operation unit that is made of resin and covers the opening on the front surface of the casing. In-vehicle wireless device.

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