WO2011027595A1 - タイヤ状態検出装置 - Google Patents
タイヤ状態検出装置 Download PDFInfo
- Publication number
- WO2011027595A1 WO2011027595A1 PCT/JP2010/058351 JP2010058351W WO2011027595A1 WO 2011027595 A1 WO2011027595 A1 WO 2011027595A1 JP 2010058351 W JP2010058351 W JP 2010058351W WO 2011027595 A1 WO2011027595 A1 WO 2011027595A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- rim
- printed wiring
- tire
- wiring board
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/0452—Antenna structure, control or arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0491—Constructional details of means for attaching the control device
- B60C23/0494—Valve stem attachments positioned inside the tyre chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0491—Constructional details of means for attaching the control device
- B60C23/0498—Constructional details of means for attaching the control device for rim attachments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2241—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in or for vehicle tyres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
Definitions
- the present invention relates to a tire condition detection device, and more particularly to a tire condition detection device that transmits a detection result to the outside by radio waves and is used by being mounted on a rim in the tire.
- a tire condition detection device equipped with a radio that transmits air pressure data on a tire rim well (see, for example, Patent Document 1).
- the antenna provided in the tire condition detection device is affected by the approach of a metal part such as a rim, and the characteristics often change greatly.
- the antenna design with the tire condition detection device installed on a metal such as a rim It was essential.
- the resonance frequency of the antenna of the tire condition detection device often deviates significantly if the shape of the rim to be mounted on the tire condition detection device is different, so in order to maintain good antenna characteristics Therefore, it was necessary to design an antenna for each rim shape on a one-by-one basis.
- an object of the present invention is to provide a tire condition detection device capable of obtaining good antenna characteristics even when the shape of a rim to be mounted is changed, reducing manufacturing costs, and capable of mass production. Is to provide.
- the present invention provides a sensor that detects a predetermined physical state of a tire, an antenna having a predetermined resonance frequency, and a detection that transmits information on detection results of the sensor as radio waves from the antenna.
- a tire condition detection device that includes a circuit, a case that houses the sensor, the antenna, and the detection circuit and that transmits radio waves, and that is used by attaching the case to a rim in a tire, when the case is attached to the rim And is fixed at a predetermined distance from the antenna so as to form a boundary surface between the antenna and the rim, and is set to a potential equal to the reference potential of the detection circuit.
- a planar conductor Provided with a planar conductor.
- a planar conductor set at the reference potential of the detection circuit is provided at a predetermined distance from the antenna in the apparatus, and when the apparatus is mounted on the rim, the planar conductor is a boundary between the antenna and the rim. Therefore, the influence of the metal constituting the rim on the antenna can be greatly reduced as compared with the prior art.
- the case when the tire condition detection device is mounted on the rim, the case is fixed to the surface of the rim so that the bottom surface of the case faces the surface of the rim. Since the case is fixed to the rim in this way, a plane conductor set at a reference potential is arranged between the antenna and the surface of the rim. Therefore, when the tire condition detection device is mounted on the rim, the plane conductor is Since it becomes a boundary surface between an antenna and a rim
- 1 is an external view showing a tire condition detection device according to a first embodiment of the present invention.
- the disassembled perspective view which shows the tire condition detection apparatus in 1st Embodiment of this invention.
- the top view which shows the printed wiring board in 1st Embodiment of this invention
- the side view which shows the printed wiring board in 1st Embodiment of this invention.
- the block diagram which shows the electric system circuit of the tire condition detection apparatus in 1st Embodiment of this invention.
- Side surface sectional drawing which shows the mounting state to the rim of the tire condition detection apparatus in 1st Embodiment of this invention.
- the disassembled perspective view which shows the tire condition detection apparatus in 2nd Embodiment of this invention.
- the top view which shows the printed wiring board in 2nd Embodiment of this invention
- the side view which shows the printed wiring board in 2nd Embodiment of this invention.
- Side surface sectional drawing which shows the mounting state to the rim
- the disassembled perspective view which shows the tire condition detection apparatus in 3rd Embodiment of this invention.
- the top view which shows the printed wiring board in 3rd Embodiment of this invention
- the side view which shows the printed wiring board in 3rd Embodiment of this invention.
- the disassembled perspective view which shows the antenna in 3rd Embodiment of this invention.
- External appearance perspective view which shows the principal part of the printed wiring board in 4th Embodiment of this invention
- the external appearance perspective view which shows the planar conductor board and holding material in 4th Embodiment of this invention
- the external appearance perspective view which shows the holding material in 4th Embodiment of this invention.
- Smith chart for explaining antenna characteristics in the fourth embodiment of the present invention Smith chart explaining antenna characteristics when appropriate in the conventional example Smith chart explaining variation in antenna characteristics in conventional example
- FIG. 1 is a view showing a tire mounted with a tire condition detection device according to the first embodiment of the present invention
- FIG. 2 is an external perspective view showing the tire condition detection device according to the first embodiment of the present invention
- FIG. FIG. 4 is a plan view showing a printed wiring board according to the first embodiment of the present invention
- FIG. 5 shows the printed wiring board according to the first embodiment of the present invention
- FIG. 6 is a side view, and FIG. 6 is a block diagram showing an electrical circuit of the tire condition detection device in the first embodiment of the present invention.
- the tire condition detection device 10 is fixed to a predetermined position of the rim 3 inside the air chamber 2 of the tire 1, and includes a pressure detection element and a temperature detection element described later provided in the tire condition detection device 10.
- the pressure and temperature in the air chamber 2 of the tire 1 are detected by the sensor unit, and the detection result is converted into a digital value.
- the tire condition detection device 10 generates and transmits digital information including these digital values.
- This digital information includes identification information unique to the tire condition detection device 10 in addition to the digital value of the detection result.
- the tire condition detection device 10 includes a case 100 in which a printed wiring board 300 and a battery 420 are accommodated.
- a detection circuit 400 shown in FIG. 6 is formed on the printed wiring board 300. That is, the detection circuit 400 includes a sensor unit 410, a battery 420, a main control unit 430, a transmission unit 440, and an antenna 450.
- the case 100 includes a case main body 120 made of a synthetic resin that transmits radio waves and an upper lid 110.
- a rectangular opening 113 is formed at a predetermined position of the upper lid 110 at a position facing the position of the sensor unit 410.
- the opening 113 is covered with a lid 111 having a vent 112.
- the sensor unit 410 is mounted on the surface of the printed wiring board 300, and includes a pneumatic pressure detection element 411, a temperature detection element 412, and an analog / digital conversion circuit 413.
- the pressure and temperature in the air chamber 2 of the tire 1 are Is detected by the air pressure detection element 411 and the temperature detection element 412, and the detection result is converted into a digital value by the analog / digital conversion circuit 413 and output to the main control unit 430.
- Battery 420 is connected to printed circuit board 300 by connecting conductors 421 and 422, and supplies power to detection circuit 400 formed on printed circuit board 300.
- One connection conductor 421 is connected to the positive electrode of the battery 420 and the surface of the printed wiring board 300, and the other connection conductor 422 is connected to the negative electrode of the battery 420 and the back surface of the printed wiring board 300.
- the main control unit 430 includes a well-known CPU and memory, receives the detection result from the sensor unit 410 as a digital value, generates digital information including the digital value, and outputs the digital information to the transmission unit 440.
- the digital information includes identification information unique to the tire condition detection device 10, such as a manufacturing number, in addition to the digital value of the detection result.
- the transmission unit 440 transmits the digital information input from the main control unit 430 using a predetermined frequency, for example, 315 MHz radio waves.
- the antenna 450 is a helical antenna whose resonance frequency is set to the transmission frequency of the transmission unit 440, and is mounted on the surface of the printed wiring board 300.
- the antenna 450 is mounted on the surface of the printed wiring board 300 so that the axis of the helical antenna is parallel to the surface of the printed wiring board 300.
- the printed wiring board 300 is formed of a multilayer ceramic multilayer substrate, and a conductor pattern 310 is provided on almost the entire back surface thereof.
- the printed wiring board 300 is fixed to the case body 120 such that the back surface thereof, that is, the conductor pattern 310 faces the bottom surface of the case body 120.
- the thickness of the copper foil forming the conductor pattern 310 is generally 12, 18, 35, 70 microns ( ⁇ m) or the like, but considering the durability (strength against peeling), the thickness of the conductor pattern 310 Is preferably 18 ⁇ m or more.
- FIG. 7 is a side sectional view of the tire state detection device 10 having the above-described configuration when the tire state detection device 10 is mounted on the rim 3.
- the case 100 is fixed to the surface of the rim 3 so that the bottom surface of the case body 120 faces the surface of the rim 3.
- a conductor pattern 310 set at a reference potential is disposed between the antenna 450 mounted on the surface of the printed wiring board 300 and the surface of the rim 3.
- the conductor pattern (planar conductor) 310 becomes a boundary surface between the antenna 450 and the rim 3, so that the metal constituting the rim 3 has an influence on the antenna 450. Can be greatly reduced as compared with the prior art. Furthermore, since the distance between the antenna 450 and the conductor pattern 310 becomes constant depending on the thickness of the dielectric of the printed wiring board 300, the antenna characteristics can be maintained in a good state even if the shape of the rim 3 is different.
- the manufacturing cost per tire can be greatly reduced as compared with the conventional one, and mass production of the tire condition detection device 10 can be easily performed.
- FIG. 8 is an exploded perspective view showing a tire condition detection device 10A according to the second embodiment of the present invention
- FIG. 9 is a plan view showing a printed wiring board 300A according to the second embodiment of the present invention
- FIG. FIG. 11 is a side sectional view showing a mounting state of the tire state detection device 10A in the rim 3 according to the second embodiment of the present invention.
- the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.
- the difference between the second embodiment and the first embodiment is that a coiled antenna 460 is provided instead of the antenna 450 in the first embodiment, and a printed wiring board 300A is used instead of the printed wiring board 300.
- the conductor film 511 and the insulating film 512 are provided on the inner bottom surface of the case main body 120.
- the antenna 460 has a spring coil shape in which the resonance frequency is set to 315 MHz, and a feeding point is provided at the center thereof, and this feeding point is connected to the transmission unit 440 formed on the printed wiring board 300A.
- the antenna 460 has a coil diameter larger than that of the antenna 450, the coil axis of the antenna 460 is parallel to the side and the surface of the nearby printed wiring board 300A. It is provided on the outer periphery.
- the printed wiring board 300A is the same as the printed wiring board 300 except that the conductive pattern 310 provided on the back surface of the printed wiring board 300 in the first embodiment is removed, and the conductive pattern 310 is removed.
- a conductor film 511 is provided on the inner bottom surface of the case body 120, and an electrical insulating film 512 is provided on the surface of the conductor film 511.
- the insulating film 512 prevents conductive connection between the conductor film 511, the printed wiring board 300A, and the antenna 460.
- the thickness of the conductor film 511 is preferably 18 ⁇ m or more for the same reason as described above.
- the case 100 When the tire state detection device 10A having the above configuration is mounted on the rim 3, the case 100 is fixed to the surface of the rim 3 so that the bottom surface of the case main body 120 faces the surface of the rim 3, as shown in FIG.
- the conductor film 511 set at the reference potential is disposed between the antenna 460 and the surface of the rim 3. Since the conductive film (planar conductor) 511 becomes a boundary surface between the antenna 460 and the rim 3 when mounted on the antenna, the influence of the metal constituting the rim 3 on the antenna 460 can be greatly reduced compared to the conventional case. it can.
- the distance between the antenna 460 and the conductive film 511 is constant, so that the antenna characteristics are in good condition even if the shape of the rim 3 is different. Can be maintained.
- FIG. 12 is an exploded perspective view showing a tire condition detection device 10B according to the third embodiment of the present invention
- FIG. 13 is a plan view showing a printed wiring board 300B according to the third embodiment of the present invention
- FIG. 14 is a third view of the present invention
- FIG. 15 is an exploded perspective view showing a configuration of an antenna according to the third embodiment of the present invention
- FIG. 16 is a rim of the tire condition detecting device 10B according to the third embodiment of the present invention.
- FIG. In these drawings the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.
- the difference between the third embodiment and the first embodiment is that an antenna 470 is provided in place of the antenna 450 in the first embodiment, and a printed wiring board 300B is used in place of the printed wiring board 300. .
- the printed wiring board 300B has a slightly larger shape than the printed wiring board 300 in the first embodiment, and an antenna 470 is formed in a widened portion.
- a conductor pattern 320 similar to that of the first embodiment is provided on almost the entire back surface of the printed wiring board 300B.
- This conductor pattern 320 is connected to the negative electrode of the battery 420, and the potential of the conductor pattern 320 is equal to that of the detection circuit 400.
- the thickness of the conductor pattern 320 is preferably 18 ⁇ m or more for the same reason as described above.
- the antenna 470 includes a printed wiring pattern (hereinafter referred to as a wiring pattern) formed on the printed wiring board 300B and a printed wiring board 500 connected to the printed wiring board 300B by a plurality of connecting conductors.
- a wiring pattern hereinafter referred to as a wiring pattern
- the antenna 470 includes the printed wiring boards 300B and 500 and a plurality of columnar connecting conductors 711 to 718, 721 to 728,731. Note that the antenna 470 in this embodiment has a resonance frequency of 315 MHz as described above.
- the printed wiring board 500 is made of a dielectric substrate having a rectangular shape with a predetermined area and a predetermined thickness, and a plurality of through-holes at predetermined equal intervals on a straight line parallel to the long side at both sides in the width direction. 521 to 528, 531 to 538 are provided. Further, as shown in FIG. 15, the other through-hole is arranged so that the through-hole is disposed at a position substantially opposite to the center position of the gap between the through-holes of the through-holes 521 to 528 provided on one side. 531 to 538 are provided.
- wiring patterns 511 to 518 are provided on the surface of the printed wiring board 500 and arranged in parallel at equal intervals.
- one end of the wiring pattern 511 is connected to the second through hole 522 from the end in the row of one through holes 521 to 528, and the other end is a through hole 531 located at the end in the row of the other through holes 531 to 538. It is connected to.
- One end of the wiring pattern 512 is connected to the third through hole 523 from the end in the row of one through holes 521 to 528, and the other end is the through hole located second from the end in the row of the other through holes 531 to 538.
- One end of the wiring pattern 513 is connected to the fourth through hole 524 from the end in one through hole 521 to 528 row, and the other end is the third through hole located from the end in the other through hole 531 to 538 row.
- One end of the wiring pattern 514 is connected to the fifth through hole 525 from the end of one through hole 521 to 528, and the other end is the fourth through hole located from the end of the other through hole 531 to 538 row. 534.
- One end of the wiring pattern 515 is connected to the sixth through hole 526 from the end in the row of one through holes 521 to 528, and the other end is a through hole located fifth from the end in the row of the other through holes 531 to 538. It is linked to 535.
- One end of the wiring pattern 516 is connected to the seventh through hole 527 from the end in one row of the through holes 521 to 528, and the other end is a through hole located sixth from the end in the row of the other through holes 531 to 538. It is linked to 536.
- One end of the wiring pattern 517 is connected to the eighth through hole 528 from the end of one through hole 521 to 528, and the other end is the seventh through hole located from the end of the other through hole 531 to 538.
- One end of the wiring pattern 518 is disposed at a position spaced from one end of the wiring pattern 517 by the same distance as the through hole feeling, and the other end is a through hole located at the eighth position from the end of the other through holes 531 to 538. 538.
- a feeding point 514a is set at a predetermined position of the fourth wiring pattern 514 from the end, and one end of the feeding wiring pattern 541 is conductively connected to this feeding point.
- the power supply wiring pattern 541 is provided such that a through hole 542 provided at the other end is positioned in the vicinity of one short side of the printed wiring board 500.
- a plurality of through holes 621 to 628 and 631 to 638 are provided at predetermined equal intervals on a straight line parallel to the long side at both sides in the width direction of the printed wiring board 300B.
- the positions of these through holes 621 to 628 and 631 to 638 correspond to the positions of the through holes 521 to 528 and 531 to 538 in the printed wiring board 500.
- wiring patterns 611 to 618 a plurality of linear printed wiring patterns (hereinafter referred to as wiring patterns) 611 to 618 arranged in parallel at equal intervals are provided on the surface of the printed wiring board 300B.
- the width in the long side direction of the printed wiring board 300B in each wiring pattern 611 to 618 is set to the same width as the wiring patterns 511 to 518 in the printed wiring board 500, and the length in the short side direction is also the wiring of the printed wiring board 500.
- the same as patterns 511 to 518 are set.
- One end of the wiring pattern 611 is connected to the first through hole 621 from the end of one of the through holes 621 to 628, and the other end is connected to the through hole 631 positioned at the end of the other through hole 631 to 638.
- One end of the wiring pattern 612 is connected to the second through hole 622 from the end of one through hole 621 to 628, and the other end is the second through hole located from the end of the other through hole 631 to 638. 632.
- One end of the wiring pattern 613 is connected to the third through hole 623 from the end of one of the through holes 621 to 628, and the other end is the third through hole located from the end of the other through hole 631 to 638. 633.
- One end of the wiring pattern 614 is connected to the fourth through hole 624 from the end of one through hole 621 to 628 and the other end is the fourth through hole located from the end of the other through hole 631 to 638. 634.
- One end of the wiring pattern 615 is connected to the fifth through hole 625 from the end of one through hole 621 to 628, and the other end is the fifth through hole located from the end of the other through hole 631 to 638. It is linked to 635.
- One end of the wiring pattern 616 is connected to the sixth through hole 626 from the end in the row of one through holes 621 to 628, and the other end is a through hole located at the sixth from the end in the row of the other through holes 631 to 638. It is linked to 636.
- One end of the wiring pattern 617 is connected to the seventh through hole 627 from the end of one through hole 621 to 628, and the other end is the seventh through hole located from the end of the other through hole 631 to 638. It is linked to 637.
- One end of the wiring pattern 618 is connected to the eighth through hole 628 from the end of one through hole 621 to 628, and the other end is the eighth through hole located from the end of the other through hole 631 to 638. 638.
- a feeding point 615a is set at a predetermined position of the fifth wiring pattern 615 from the end, and one end of the feeding wiring pattern 641 is conductively connected to this feeding point.
- the position of the feeding point 615a is set to a position facing the feeding point 514a of the wiring pattern 514 on the printed wiring board 500.
- the power supply wiring pattern 641 is provided so that the other end 642 reaches the transmitting unit 440 formed on the printed wiring board 300B as shown in the figure.
- the wiring patterns 511 to 518 of the printed wiring board 500 and the wiring patterns 611 to 618 of the printed wiring board 300B are conductively connected by a plurality of connecting conductors 711 to 718 and 721 to 728 so as to be spiral.
- cylindrical conductors having a diameter of 0.75 mm and a length of 8.0 mm are used as the connecting conductors 711 to 718 and 721 to 728.
- connection conductors 711 to 718 is inserted and fixed in the through hole 521 to 528 of the printed wiring board 500, and one end 712a to 718a of each of the connection conductors 712 to 718 is connected to the wiring pattern 511 to 517. Is electrically connected to one end. Further, the other ends 711b to 718b of the connecting conductors 711 to 718 are inserted and fixed in the through holes 621 to 628 of the printed wiring board 300B, and the other ends 711b to 718b of the connecting conductors 711 to 718 are connected to the wiring pattern 611. Conductive connection to one end of 618.
- connection conductors 721 to 728 are inserted and fixed in through holes 531 to 538 of the printed wiring board 500, and one ends 721a to 728a of the connection conductors 721 to 728 are connected to the wiring patterns 511 to 518, respectively.
- the other end is electrically connected.
- the other ends 721b to 728b of the connection conductors 721 to 728 are inserted and fixed in the through holes 631 to 638 of the printed wiring board 300B, and the other ends 721b to 728b of the connection conductors 721 to 728 are connected to the wiring pattern 611.
- Conductive connection is made to the other end of .about.618.
- the printed wiring board 300B is provided with a through hole 651 connected to the wiring pattern 652.
- the through hole 651 is connected to a through hole 542 provided in the printed wiring board 500 by a connecting conductor 731.
- One end 731a of the connecting conductor 731 is conductively connected to the wiring pattern 541, and the other end 731b is conductively connected to the wiring pattern 652.
- the wiring pattern 652 is connected to the output of the transmission unit 440.
- the antenna elements are formed by the conductive wiring patterns 511 to 518 and 611 to 618 on the two printed wiring boards 500 and 300B, and these wiring patterns 511 to 518 and 611 to 618 are connected to the connecting conductors 711 to 718 and 721 to 728.
- a helical antenna element is formed by conducting conductive connection alternately.
- the antenna can be manufactured with the dimensional accuracy of the printed wiring patterns 511 to 518 and 611 to 618 and the dimensional accuracy of the connecting conductors 711 to 718 and 721 to 728 (for example, ⁇ 18 ⁇ m), and a high-performance antenna can be easily manufactured.
- mass production is easy and high reliability can be achieved in electrical connection to a printed wiring board, and an antenna with excellent dimensional accuracy can be easily manufactured.
- the case 100 When the tire state detection device 10B having the above configuration is attached to the rim 3, the case 100 is fixed to the surface of the rim 3 so that the bottom surface of the case body 120 faces the surface of the rim 3, as shown in FIG.
- the conductor pattern 320 set at the reference potential is disposed between the antenna 470 and the surface of the rim 3, so that the tire condition detection device 10B is attached to the rim 3. Since the conductor pattern (planar conductor) 320 serves as a boundary surface between the antenna 470 and the rim 3 when mounted on the antenna, the influence of the metal constituting the rim 3 on the antenna 470 can be greatly reduced compared to the conventional case. it can.
- FIG. 17 is an external perspective view showing a tire condition detection device 10C according to the fourth embodiment of the present invention
- FIG. 18 is a plan view showing the tire condition detection device 10C according to the fourth embodiment of the present invention
- FIG. FIG. 20 and FIG. 21 are external perspective views showing a printed wiring board 300C according to the fourth embodiment of the present invention
- FIG. 22 is a diagram according to the fourth embodiment of the present invention. It is an external perspective view showing the main part of a printed wiring board 300C.
- the same components as those in the first to third embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.
- the difference between the fourth embodiment and the first to third embodiments is that two substrates 351, 352 having substantially the same shape are arranged in parallel with a predetermined interval instead of the printed wiring board 300B in the third embodiment.
- the conductor pattern 320 is replaced with a planar conductor plate 361, which is housed in the case 130.
- the case 130 has a substantially rectangular parallelepiped shape, has protrusions for screwing at both ends in the longitudinal direction, and includes a main body 131 and a lid 132.
- a storage space 134 for storing the printed wiring board 300C is formed inside the main body 131, and the opening of the storage space 134 is closed by fixing the lid 132 to the main body 131 with screws 141. Is done.
- a vent hole 133 is formed in the lid body 132, and even when the lid body 132 is fixed to the main body 131, air flows from the outside to the storage space 134 through the vent hole 133. .
- the printed wiring board 300 ⁇ / b> C includes two printed wiring boards 351 and 352 having a substantially rectangular shape arranged in parallel with a predetermined interval therebetween, and a connection that constitutes an antenna 470 between them.
- the conductors 711 to 718, 721 to 728,731 are fixed to each other by the connecting printed wiring board 353.
- the above-described antenna 470 is formed on one end side in the longitudinal direction of the printed wiring board 300C, and electronic components constituting an electronic circuit including the sensor unit 410 and the battery 420 are mounted on the other end side.
- the connecting printed wiring board 353 is soldered to each of the two printed wiring boards 351 and 352.
- the printed wiring board 351 is provided with a plurality of through holes 621 to 628, 631 to 638 and a plurality of linear printed wiring patterns 611 to 618 constituting the antenna 470, as in the third embodiment.
- the other printed wiring board 352 has a plurality of linear printed wiring patterns arranged in parallel with the plurality of through holes 521 to 528 and 531 to 538 constituting the antenna 470 at equal intervals. 511 to 518 are provided.
- a rectangular planar conductor plate 361 is fixed to the printed wiring board 300C by four holding members 371.
- a planar conductor plate 361 is provided at the position of the antenna 470 so as to be parallel to the printed wiring board 351 located on the bottom surface side of the case main body 131 when the printed wiring board 300C is housed in the case 130.
- the planar conductor plate 361 is fixed to the printed wiring board 351 by a holding material 371 so as to maintain a predetermined distance.
- the planar conductor plate 361 is provided in place of the conductor pattern 320 in the third embodiment, and is conductively connected to a predetermined conductor pattern (a conductor pattern connected to the negative electrode of the battery 420) of the printed wiring board 351.
- the reference potential is set.
- the holding member 371 is fixed to the four corners of the planar conductor plate 361.
- the holding member 371 has a shape in which cylindrical projections 371b having a diameter smaller than that of the main body 371a are provided at both ends of the cylindrical main body 371a.
- the planar conductor plate 361 set at the reference potential is arranged at a predetermined distance from the printed wiring board 351, the case 130 is attached to the rim 3 so that the bottom surface of the case body 131 contacts the rim 3.
- the planar conductor plate 361 set at the reference potential is arranged between the antenna 470 and the surface of the rim 3, so that the planar conductor plate 361 is mounted when the tire state detection device 10C is mounted on the rim 3.
- the antenna 470 has a resonance frequency of 315 MHz when the planar conductor plate 361 is mounted on the printed wiring board 351.
- the characteristic curve using the Smith chart is represented by the curve A shown in FIG. 25, and the antenna impedance at 315 MHz. Is 50 ohms.
- the distance D between the printed wiring board 351 and the flat conductor plate 361 at this time is set to 1.5 mm by the holding material 371.
- FIG. 25 shows characteristic curves B and C when the distance D between the printed wiring board 351 and the flat conductor plate 361 is changed as an experimental example.
- a characteristic curve B in FIG. 25 is the case where the distance D between the printed wiring board 351 and the planar conductor plate 361 is deviated from 1.5 mm to 0.1 mm. At this time, the resonance frequency of the antenna 470 is 321 MHz. The impedance is 66 ohms.
- a characteristic curve C in FIG. 25 is a case where the distance D between the printed wiring board 351 and the planar conductor plate 361 is shifted from 1.5 mm to 0.15 mm. At this time, the resonance frequency of the antenna 470 is 310 MHz. The impedance is 70 ohms.
- the antenna characteristics of the antenna 470 change depending on the distance from the flat conductor plate 361, and a large gain cannot be obtained. That is, when the distance between the antenna 470 and the planar conductor plate 361 is slightly deviated from the design value (for example, 50 ⁇ m), the characteristics are greatly changed.
- the holding member 471 is disposed between the antenna 470 and the planar conductor plate 361 so that the distance D is kept constant. Furthermore, since it is important that the distance D between the antenna 470 and the planar conductor plate 361 be free from the influence of the dielectric (air having no loss of dielectric loss tangent is best), the space D is not sandwiched so as to interfere with the antenna 470. By disposing the conductor plate 361, the antenna dielectric loss tangent loss is eliminated. With such a configuration, mass production is easy, and even when any shape of metal approaches, stable antenna characteristics can be obtained and antenna gain can be improved. .
- the frequency characteristics of the antenna 470 change when the distance D between the printed wiring board 351 and the flat conductor plate 361 changes. It is preferable to use a member having a small rate. For example, it is preferable to use invar having a small expansion / contraction rate due to temperature and humidity as the holding material 371.
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- Engineering & Computer Science (AREA)
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- Measuring Fluid Pressure (AREA)
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Abstract
Description
Claims (7)
- タイヤの所定の物理状態を検出するセンサと、所定の共振周波数を有するアンテナと、前記センサの検出結果の情報を前記アンテナから電波として送信する検出回路と、前記センサとアンテナと検出回路を収納し且つ電波を透過するケースとを備え、前記ケースをタイヤ内のリムに装着して用いるタイヤ状態検出装置において、
前記ケースを前記リムに装着したときに前記アンテナと前記リムとの間に境界面を形成するように前記アンテナから所定距離の位置に前記アンテナと電気的に絶縁された状態で固定され且つ前記検出回路の基準電位と等しい電位に設定されている平面導体を設けた
ことを特徴とするタイヤ状態検出装置。 - 前記ケースに固定されたプリント配線基板を前記ケース内部に備え、
前記ケースを前記リムに装着したときに前記リムに対向する面とは異なる前記プリント配線基板の面上に前記アンテナが設けられており、
前記リムに対向する前記プリント配線基板の面に前記平面導体が設けられている
ことを特徴とする請求項1に記載のタイヤ状態検出装置。 - 前記ケースを前記リムに装着したときに前記リムに対向する前記ケースの内面に前記平面導体が設けられている
ことを特徴とする請求項1に記載のタイヤ状態検出装置。 - 前記平面導体の厚みが18μm以上に設定されていることを特徴とする請求個1乃至3の何れかに記載のタイヤ状態検出装置。
- 前記アンテナは、所定軸の周りを所定径で旋回して前記軸方向に延びるようなコイル形状をなしていることを特徴とする請求項1乃至4の何れかに記載のタイヤ状態検出装置。
- 前記コイル形状のアンテナの軸が前記平面導体の面と平行に配置されていることを特徴とする請求項5に記載のタイヤ状態検出装置。
- 前記アンテナは前記プリント配線基板の一面側に固定されて設けられ、
前記平面導体は前記プリント配線基板の他面と前記平面導体の一面が所定の間隔を開けて平行になるように且つ前記プリント配線基板の他面と前記平面導体の一面との間に所定の空間を形成するように複数の保持材によって前記プリント配線基板に固定されている
ことを特徴とする請求項1に記載のタイヤ状態検出装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011509745A JP4868192B2 (ja) | 2009-09-01 | 2010-05-18 | タイヤ状態検出装置 |
KR1020127003722A KR101168244B1 (ko) | 2009-09-01 | 2010-05-18 | 타이어 상태 검출 장치 |
US13/393,132 US8305291B2 (en) | 2009-09-01 | 2010-05-18 | Tire-state detection device |
EP10813546.8A EP2474429B1 (en) | 2009-09-01 | 2010-05-18 | Tire-state detection device |
CN201080038784.7A CN102612443B (zh) | 2009-09-01 | 2010-05-18 | 轮胎状态检测装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-201574 | 2009-09-01 | ||
JP2009201574 | 2009-09-01 |
Publications (1)
Publication Number | Publication Date |
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WO2011027595A1 true WO2011027595A1 (ja) | 2011-03-10 |
Family
ID=43649147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/058351 WO2011027595A1 (ja) | 2009-09-01 | 2010-05-18 | タイヤ状態検出装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8305291B2 (ja) |
EP (1) | EP2474429B1 (ja) |
JP (1) | JP4868192B2 (ja) |
KR (1) | KR101168244B1 (ja) |
CN (1) | CN102612443B (ja) |
WO (1) | WO2011027595A1 (ja) |
Cited By (2)
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WO2012073973A1 (ja) * | 2010-12-02 | 2012-06-07 | 横浜ゴム株式会社 | 情報取得装置を備えたタイヤ |
EP2863479A4 (en) * | 2012-06-13 | 2016-03-02 | Yokohama Rubber Co Ltd | STATUS DETECTION DEVICE |
Families Citing this family (5)
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US8725330B2 (en) * | 2010-06-02 | 2014-05-13 | Bryan Marc Failing | Increasing vehicle security |
JP6154172B2 (ja) | 2013-04-01 | 2017-06-28 | 富士電機株式会社 | 圧力検出装置及び圧力検出装置の組立方法 |
US9994082B2 (en) * | 2015-07-31 | 2018-06-12 | Texas Instruments Deutschland, Gmbh | Tire monitoring based on inductive sensing |
FR3041286B1 (fr) | 2015-09-22 | 2017-10-06 | Continental Automotive France | Procede et unite de mesure pour vehicule automobile |
CN105196806B (zh) * | 2015-10-12 | 2017-06-30 | 铁将军汽车电子有限公司 | 胎压计 |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2011027595A1 (ja) | 2013-02-04 |
KR101168244B1 (ko) | 2012-07-30 |
JP4868192B2 (ja) | 2012-02-01 |
KR20120027547A (ko) | 2012-03-21 |
EP2474429A1 (en) | 2012-07-11 |
US8305291B2 (en) | 2012-11-06 |
EP2474429A4 (en) | 2013-03-13 |
CN102612443A (zh) | 2012-07-25 |
CN102612443B (zh) | 2015-02-11 |
EP2474429B1 (en) | 2014-06-25 |
US20120154242A1 (en) | 2012-06-21 |
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