JP2018074238A - Radio transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio transmitter that sufficiently resists an environment in which a vehicle is used and enables reliable communication.SOLUTION: The present application discloses a radio transmitter including an antenna unit including an antenna and a housing structure for housing the antenna unit. The housing structure forms an outer surface including a facing region facing the antenna. The facing region has air permeability and water tightness.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless transmission device mounted on a vehicle.

  In a vehicle development site, many sensors may be attached to various parts of the vehicle (see Patent Document 1). Since the sensor of Patent Document 1 is connected to the data collection device by a signal line, an operator needs to spend a great deal of labor for arranging the signal line between the sensor and the data collection device.

  Patent Document 2 proposes a technique for wirelessly communicating data acquired by a sensor to a data collection device. According to the technique of Patent Document 2, the operation of arranging the signal line between the sensor and the data collection device is not required.

JP2013-253898A JP 2008-164467 A

  If data is communicated wirelessly, high reliability is required for communication. In addition, a device that can sufficiently withstand the environment in which the vehicle is used needs to be used for wireless communication. However, Patent Document 2 does not suggest a technique that meets these requirements.

  An object of the present invention is to provide a wireless transmission device that can sufficiently withstand an environment in which a vehicle is used and can perform highly reliable communication.

  A wireless transmission device according to one aspect of the present invention includes an antenna unit having an antenna and a housing structure in which the antenna unit is accommodated. The housing structure forms an outer surface including a facing region facing the antenna. The opposing region has air permeability and water tightness.

  According to the above configuration, since the antenna unit having the antenna is housed in the housing structure, the antenna unit is protected by the housing structure and is not easily damaged in an environment where the vehicle is used. Since the facing region facing the antenna has air permeability, air in the housing structure is released to the outside through the facing region, and the pressure in the housing structure is also in an appropriate state. Therefore, the wireless transmission device can transmit a signal with high reliability under various usage environments. In addition, since the facing area has water tightness, the antenna unit is not easily exposed to water even when the vehicle travels in an environment where water exists. Therefore, the antenna unit is not easily damaged even in an environment where water exists.

  With regard to the above configuration, the antenna unit may include a substrate that executes processing for outputting a signal from the antenna. The housing structure may include a dielectric resin molding portion that partially covers the substrate and forms an opening in the facing region, and a cover that covers the opening. The cover may have the air permeability and the water tightness.

  According to the above configuration, the substrate that executes the process for outputting a signal from the antenna is covered with the dielectric resin molding portion, so that it is not easily damaged in an environment where the vehicle is used. Therefore, the process for outputting a signal from the antenna is performed with high reliability. Since the opening formed by the resin molded part in the facing region is covered with a cover having air permeability, air in the housing structure is released to the outside through the facing region, and the pressure in the housing structure is also in an appropriate state. Become. Therefore, the wireless transmission device can transmit a signal with high reliability under various usage environments. In addition, since the cover has water tightness, the antenna unit is not easily exposed to water even when the vehicle travels in an environment where water exists. Therefore, the antenna unit is not easily damaged even in an environment where water exists.

  With respect to the above configuration, the resin molding portion may form an air chamber portion continuous from the opening portion. The antenna may be supported by the substrate in the air chamber.

  According to said structure, since an antenna is supported by the board | substrate in the air chamber part which continues from an opening part, a signal is transmitted from an antenna, hardly disturbed by a housing structure.

  With respect to the above configuration, the substrate may be connected to a corrosion sensor that detects parameters associated with vehicle corrosion. The signal may represent the parameter.

  According to the above configuration, the corrosion sensor detects a parameter related to the corrosion generated in the vehicle, and the signal transmitted from the antenna represents the parameter related to the corrosion. Is acquired.

  With respect to the above configuration, the corrosion sensor may be disposed outside a vehicle compartment of the vehicle.

  According to said structure, since a board | substrate is coat | covered with the resin molding part and the cover which covers the opening part which the resin molding part formed has watertightness, a corrosion sensor is arrange | positioned outside the vehicle interior of a vehicle. Even if this is done, damage caused by water outside the passenger compartment is unlikely to occur in the wireless transmission device.

  With regard to the above configuration, the antenna unit may be a transmitter having a transmission power of 3 mW or less. The signal may be transmitted from the antenna to a receiver disposed inside the vehicle.

  According to the above configuration, since the signal is transmitted from the antenna to the receiver disposed inside the vehicle, even if the antenna unit is a transmitter having a transmission power of 3 mW or less, the transmitter to the receiver Signal transmission to is performed with high reliability. Since the antenna unit is a transmitter having a transmission power of 3 mW or less, the antenna unit does not consume excessively large power. Thus, corrosion data can be collected over a long period of time.

  With regard to the above configuration, the antenna may be a chip antenna.

  According to the above configuration, since the antenna is a chip antenna, signal directivity hardly occurs. Therefore, the wireless transmission device is attached to various positions of the vehicle without being restricted by the position of the receiver that receives the signal.

  With regard to the above configuration, the antenna may be a chip antenna. The opening may be wider than the chip antenna.

  Regarding the above configuration, since the antenna is a chip antenna, signal directivity hardly occurs. Therefore, the wireless transmission device is attached to various positions of the vehicle without being restricted by the position of the receiver that receives the signal. Since the opening covered by the breathable cover is wider than the chip antenna, the air chamber can be formed sufficiently wider than the chip antenna. As a result, the resin molding part is sufficiently separated from the chip antenna, and it is difficult to cause a deviation in the resonance frequency of the antenna. Therefore, the wireless transmission device can execute efficient communication.

  With respect to the above configuration, the cover may bulge from the outer surface in response to an increase in internal pressure in the air chamber.

  According to the above configuration, even if the air in the air chamber portion expands and the internal pressure of the air chamber portion temporarily increases, the cover bulges from the outer surface in accordance with the increase in the internal pressure. Is not exposed to excessive internal pressure. Therefore, damage such as cracking and deformation is less likely to occur in the resin molded portion.

  The above-described wireless transmission device can sufficiently withstand the environment in which the vehicle is used and perform highly reliable communication.

1 is a schematic cross-sectional view of a wireless transmission device according to a first embodiment. FIG. 2 is a schematic plan view of the wireless transmission device shown in FIG. 1. It is a schematic block diagram of the measurement system of 2nd Embodiment.

<First Embodiment>
In a vehicle development site, performance evaluation of a vehicle may be performed using a large number of sensors attached to the vehicle. If wireless communication technology is applied to the transmission of signals (data) from these sensors to the data collection device, the work of arranging signal lines extending from the sensors is simplified. However, since vehicles are used in various environments, wireless transmission devices used for transmitting signals (data) are used in various usage environments (for example, environments where wireless transmission devices are exposed to water, It is necessary to have a structure that can withstand an environment in which atmospheric pressure fluctuation is large and that transmits signals (data) with high reliability. In the first embodiment, an exemplary wireless transmission device that can be suitably used for vehicle performance evaluation will be described.

  FIG. 1 is a schematic cross-sectional view of a wireless transmission device 100 according to the first embodiment. A wireless transmission device 100 will be described with reference to FIG.

  The wireless transmission device 100 includes an antenna unit 200 and a housing structure 300. The antenna unit 200 is accommodated in the housing structure 300.

  The antenna unit 200 includes an antenna 210 and a substrate 220. The antenna 210 is mounted on the substrate 220. In addition to the antenna 210, various electronic components such as terminals and a battery may be mounted on the substrate 220. Therefore, the principle of this embodiment is not limited to a specific electronic component mounted on the substrate 220.

  In the present embodiment, a general chip antenna is used as the antenna 210. Alternatively, other types of antenna components may be used as the antenna 210. The principle of this embodiment is not limited to a specific antenna component used as the antenna 210.

  The substrate 220 includes a first substrate 231 and a second substrate 232 that is smaller than the first substrate 231. The first substrate 231 is electrically connected to the second substrate 232. The second substrate 232 may be formed so as to have all functions for executing wireless transmission. On the other hand, the first substrate 231 may be formed to perform functions other than wireless transmission.

  Each of the first substrate 231 and the second substrate 232 is a substantially rectangular plate component. The first substrate 231 includes a first surface 221, a second surface 222, and a peripheral surface 223. The second substrate 232 is supported on the first surface 221. Various electronic components such as terminals and batteries are fixed to the first surface 221. The second surface 222 faces away from the first surface 221. The peripheral surface 223 is located between the first surface 221 and the second surface 222 and forms a rectangular outline of the first substrate 231.

  The housing structure 300 includes a resin molding part 310 and a cover 320. The resin molding part 310 includes a resin part 311 and a dam part 312. The resin portion 311 is formed by a general molding technique using a dielectric resin material (for example, ABS resin). The resin portion 311 entirely covers the second surface 222 and the peripheral surface 223 of the first substrate 231. The resin portion 311 partially covers the first surface 221 of the first substrate 231. Many bubbles may be formed in the resin portion 311 and / or the dam portion 312. In this case, the resin part 311 and / or the dam part 312 hardly affects the transmission of the signal from the antenna 210.

  Similar to the resin portion 311, the dam portion 312 is formed of a dielectric resin. The dam portion 312 includes a standing wall 313 and a lid wall 314. The standing wall 313 is erected from the outline of a predetermined rectangular area set on the first surface 221 of the first substrate 231. The standing wall 313 includes a first end surface 315 and a second end surface 316 opposite to the first end surface 315. The first edge surface 315 is in contact with the first surface 221 of the first substrate 231. The lid wall 314 abuts on the second end edge surface 316 and forms an air chamber 317 surrounded by the first substrate 231, the standing wall 313, and the lid wall 314. The antenna 210 is mounted on the second substrate 232 and supported by the substrate 220.

  The dam portion 312 prevents the dielectric resin material forming the resin portion 311 from flowing into the air chamber portion 317 during the molding of the resin portion 311. Therefore, the resin material does not adhere to the antenna 210 or the second substrate 232.

  The lid wall 314 includes a first surface 331, a second surface 332, and a convex ring 333. The first surface 331 of the lid wall 314 faces the first surface 221 of the first substrate 231. The first surface 331 of the lid wall 314 is in contact with the second end edge surface 316 of the standing wall 313. The second surface 332 of the lid wall 314 faces in the opposite direction to the first surface 331. When the resin part 311 is molded, a thin layer of a resin material forming the resin part 311 is formed on the second surface 332 of the lid wall 314.

  The lid wall 314 has an opening 334 that extends from the second surface 332 toward the first surface 331 and continues to the air chamber 317. The opening 334 is formed at a position facing the antenna 210. The convex ring 333 protrudes from the second surface 332 and surrounds the opening 334. During the molding of the resin portion 311, the convex ring 333 dams up the molten resin material that flows on the second surface 332 of the lid wall 314. Therefore, the resin material forming the resin portion 311 is unlikely to flow into the air chamber portion 317 through the opening 334. The convex ring 333 and the resin portion 311 form the outer surface of the wireless transmission device 100. With respect to this embodiment, the facing region is exemplified by the region of the second surface 332 in which the opening 334 is formed.

  The cover 320 is attached to the second surface 332 of the lid wall 314 in the region surrounded by the convex ring 333 and closes the opening 334. The cover 320 is formed from a thin film material having air permeability and water tightness. Since the cover 320 has air permeability, the air in the air chamber 317 can be released through the cover 320. Since the pressure in the air chamber 317 can be adapted to the surrounding environment, the wireless transmission device 100 can perform transmission operation with high reliability under various uses.

  A number of micropores are formed in the cover 320 with respect to air permeability. For example, more than 1 billion micropores per square centimeter may be formed in the cover 320. The micropores are set to a size that does not allow passage of water. For example, the thin film material used as the cover 320 may satisfy a waterproof grade (JIS IPX6) of “6th grade” or higher. As a thin film material, GORE-TEX (registered trademark) can be suitably used.

  For example, air in the air chamber 317 may expand due to atmospheric pressure fluctuations in the environment where the wireless transmission device 100 is used. In this case, the internal pressure of the empty chamber 317 temporarily increases. The thin film material described above may be deformed so as to bulge from the outer surface formed by the resin portion 311 as the internal pressure increases. As a result, the resin part 311 is not exposed to an excessively large internal pressure. Therefore, damage such as cracking and deformation is less likely to occur in the resin portion 311.

  FIG. 2 is a schematic plan view of the wireless transmission device 100. With reference to FIG.1 and FIG.2, the radio | wireless transmitter 100 is further demonstrated.

  As shown in FIG. 2, the opening 334 has a larger area than the main surface (upper surface) of the antenna 210. Therefore, the air chamber 317 is also formed sufficiently wider than the antenna 210. Since the resin portion 311 and the dam portion 312 are not excessively close to the antenna 210, the resin portion 311 and the dam portion 312 are unlikely to affect the resonance frequency of the antenna 210 and hardly increase the resistance of the antenna 210. As a result, the wireless transmission device 100 can achieve efficient transmission (that is, a long communication distance). The cover 320 is also disposed at a position sufficiently away from the main surface of the antenna 210 for efficient transmission of the wireless transmission device 100.

  A circuit that executes processing for outputting a signal from the antenna 210 is formed on the second substrate 232. As shown in FIG. 2, the second substrate 232 is accommodated in the empty chamber 317. Therefore, the second substrate 232 is isolated from the molten resin by the dam portion 312 during the molding of the resin portion 311, and thermal damage is less likely to occur in the second substrate 232.

Second Embodiment
The wireless transmission device described in relation to the first embodiment can be suitably used for a measurement system for measuring the corrosion resistance performance of a vehicle. As described in the first embodiment, since the antenna and the circuit board of the wireless transmission device are disposed in the air chamber closed by the cover having air permeability and water tightness, the wireless transmission device is disposed outside the passenger compartment. Even when used with a corrosion sensor that may be exposed to water, damage caused by water is unlikely to occur in the wireless transmission device, and the wireless transmission device reliably transmits a signal (data) indicating corrosion. Can be sent. In the second embodiment, an exemplary measurement system is described.

  FIG. 3 is a schematic block diagram of the measurement system 400 of the second embodiment. With reference to FIGS. 1 and 3, the measurement system 400 is described.

  The measurement system 400 is used to measure the corrosion resistance performance of the vehicle VCL. The measurement system 400 includes four wireless transmission devices 101, 102, 103, 104, four corrosion sensors 411, 412, 413, 414, a reception antenna 420, and a data collection device 430. The wireless transmission device 100 described in relation to the first embodiment can be used as the wireless transmission devices 101, 102, 103, and 104, respectively. The description regarding the wireless transmission device 100 is incorporated in each of the wireless transmission devices 101, 102, 103, and 104.

  The corrosion sensors 411, 412, 413, and 414 detect parameters relating to corrosion of the vehicle VCL. An operator who constructs the measurement system 400 can prepare the same number of corrosion sensors as the parts in the vehicle VCL that require corrosion measurement. Thus, the measurement system may have less than 4 corrosion sensors and may have more than 4 corrosion sensors. The principle of this embodiment is not limited at all depending on how many corrosion sensors the measurement system includes.

  Corrosion sensors 411, 412, 413, and 414 are attached to the outer surface of vehicle VCL. Accordingly, the corrosion sensors 411, 412, 413, and 414 may be exposed to water outside the vehicle VCL. The operator may determine the attachment positions of the corrosion sensors 411, 412, 413, and 414 so as to meet the purpose of measuring the corrosion resistance performance of the vehicle VCL. Therefore, the principle of this embodiment is not limited to a specific mounting position of the corrosion sensors 411, 412, 413, 414.

  Each of the corrosion sensors 411, 412, 413, and 414 may be a general sensor element that can detect corrosion of the vehicle VCL. For example, an ACM (Atmospheric Corrosion Monitor) type corrosion sensor can be used as each of the corrosion sensors 411, 412, 413, and 414. The principle of the present embodiment is not limited to specific sensor elements used as the corrosion sensors 411, 412, 413, and 414, respectively.

  The wireless transmission device 101 is disposed near the corrosion sensor 411. The wireless transmission device 102 is disposed near the corrosion sensor 412. The wireless transmission device 103 is disposed near the corrosion sensor 413. The wireless transmission device 104 is located near the corrosion sensor 414. Therefore, similarly to the corrosion sensors 411, 412, 413, and 414, the wireless transmission devices 101, 102, 103, and 104 may be exposed to water outside the vehicle VCL. As described in relation to the first embodiment, the second substrate 232 and the antenna 210 are disposed in the air chamber 317 that is closed by the water-tight cover 320 (see FIG. 1). Damage caused by water outside the VCL is unlikely to occur in the wireless transmission devices 101, 102, 103, and 104.

  A short signal line extending from the corrosion sensor 411 is connected to the wireless transmission device 101. A short signal line extending from the corrosion sensor 412 is connected to the wireless transmission device 102. A short signal line extending from the corrosion sensor 413 is connected to the wireless transmission device 103. A short signal line extending from the corrosion sensor 414 is connected to the wireless transmission device 104. As described above, since the wireless transmission devices 101, 102, 103, and 104 are disposed near the corrosion sensors 411, 412, 413, and 414, respectively, the wireless transmission devices 101, 102, 103, and 104 and the corrosion sensors 411, 412 are disposed. , 413, 414 does not require much effort.

  Each of the corrosion sensors 411, 412, 413, and 414 generates a detection signal indicating the level of corrosion of the vehicle VCL at the corresponding measurement site. The detection signal is transmitted to the substrate 220 of each of the wireless transmission devices 101, 102, 103, and 104 through the signal line. A circuit formed on the second substrate 232 of the substrate 220 processes the detection signal and generates a wireless signal representing the level of corrosion. The radio signal is transmitted from the antenna 210 to the receiving antenna 420.

  The receiving antenna 420 is disposed in the vehicle interior of the vehicle VCL. The receiving antenna 420 may be a general USB antenna or other antenna component. The principle of this embodiment is not limited to a specific antenna component used as the receiving antenna 420. With respect to this embodiment, the receiver is illustrated by receive antenna 420.

  As described in relation to the first embodiment, since a chip antenna is used as the antenna 210, the reception antenna 420 is connected to the wireless transmission device 101 regardless of the arrangement position of the wireless transmission devices 101, 102, 103, and 104. , 102, 103, 104 can receive radio signals. Therefore, the wireless signal is transmitted with high reliability between the wireless transmission devices 101, 102, 103, 104 and the reception antenna 420.

  As described above, since the reception antenna 420 is disposed in the vehicle interior of the vehicle VCL, the reception antenna 420 is not excessively separated from each of the wireless transmission devices 101, 102, 103, and 104. Therefore, the transmission power of the antenna unit 200 may be 3 mW or less. In this case, since each of the wireless transmission devices 101, 102, 103, and 104 does not consume excessively large power, communication between the wireless transmission devices 101, 102, 103, and 104 and the reception antenna 420 is performed by exchanging batteries. Can be carried out over a long period of time without requiring

  The data collection device 430 may be disposed in the trunk room of the vehicle VCL. Since a trunk room generally has a large volume, a general personal computer can be suitably used as the data collection device 430. The data collection device 430 is electrically connected to the reception antenna 420 by a signal line. The radio signal received by the receiving antenna 420 is transmitted to the data collection device 430 through a signal line. As a result, the data collection device 430 can store data relating to corrosion measured at various locations on the vehicle VCL.

  A designer can design various wireless transmission apparatuses and various measurement systems using the principle of the above-described embodiment.

  The principle of the above-described embodiment is suitably used in a vehicle development site.

100 to 104 ... wireless transmission device 200 ... antenna unit 210 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Antenna 220 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Substrate 300・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Case structure 310 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Resin molding part 317 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... empty chamber 320 ... cover 334 ... ... Openings 411 to 414 ... Corrosion sensor 420 ... Receiving antenna ( Receiving machine)
VCL ... Vehicle

Claims (9)

An antenna unit having an antenna;
A housing structure in which the antenna unit is accommodated,
The housing structure forms an outer surface including a facing region facing the antenna,
The facing area is a wireless transmission device having air permeability and water tightness. The antenna unit includes a substrate that performs processing for outputting a signal from the antenna;
The housing structure includes a dielectric resin molding portion that partially covers the substrate and forms an opening in the opposing region, and a cover that covers the opening,
The wireless transmission device according to claim 1, wherein the cover has the air permeability and the water tightness. The resin molding part forms an air chamber part that continues from the opening part,
The wireless transmission device according to claim 2, wherein the antenna is supported by the substrate in the air chamber. The substrate is connected to a corrosion sensor that detects parameters associated with vehicle corrosion;
The wireless transmission device according to claim 2, wherein the signal represents the parameter. The wireless transmission device according to claim 4, wherein the corrosion sensor is disposed outside a passenger compartment of the vehicle. The antenna unit is a transmitter having a transmission power of 3 mW or less,
The wireless transmission device according to claim 4, wherein the signal is transmitted from the antenna to a receiver disposed inside the vehicle. The wireless transmission device according to claim 2, wherein the antenna is a chip antenna. The antenna is a chip antenna;
The wireless transmission device according to claim 3, wherein the opening is wider than the chip antenna. The wireless transmission device according to claim 3, wherein the cover bulges from the outer surface in response to an increase in internal pressure in the air chamber.

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