JP2022092655A - Booster seat with conductive layer and wireless communication system - Google Patents

Abstract

To provide a booster seat with a conductive layer that excellently relays wireless communication performed by an on-vehicle communication device and a communication terminal with a relatively simple configuration, and provide a wireless communication system.SOLUTION: A booster seat 100 with a conductive layer 130 that enables short-range wireless communication between an on-vehicle communication device 5 and a communication terminal by relaying electromagnetic waves for communication transmitted and received between the on-vehicle communication device 5 provided on a vehicle and the communication terminal outside the vehicle includes: a flat plate portion 131 provided on a surface of a non-conductive plate-shaped portion of the vehicle and extending in a plane shape; an opening 133 that is not the conductive layer 130 and overlaps with at least part of an open area of a coil of an antenna 52 that transmits and receives electromagnetic waves for communication included in the on-vehicle communication device 5, in a plan view along a normal of the surface when the non-conductive plate-shaped portion is in a closed state; and a pair of protrusions 132 that extend from the flat plate portion 131 so as to surround the opening 133, and face each other at a distance from each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a conductive member that relays wireless communication performed between an in-vehicle communication device inside a vehicle and an external communication terminal.

Recently, a wireless communication system has been proposed in which the door key of an automobile is unlocked or locked, or the engine is started or stopped by operating a user's mobile terminal. In this method, the user's mobile phone and the vehicle-mounted communication device inside the vehicle perform wireless communication, and the ID information of the vehicle registered in the mobile phone in advance is transmitted from the mobile phone to the vehicle-mounted communication device. After that, the electronic control device that received the information from the in-vehicle communication device compares and collates this information with the ID information registered in advance, and if both match, it is determined that the access is from a legitimate user. The door key is unlocked and locked.

As such, for example, in Patent Document 1, a communication master provided in a vehicle and its communication terminal can communicate with each other by short-range wireless communication, and the communication terminal signals a signal in response to an inquiry from the communication master. Is described as a wireless communication system that replies to the communication master to communicate. This is a short-range wireless communication by providing a secondary antenna with the antenna of the communication master as the primary antenna on the movable door glass provided in the vehicle and relaying the radio waves transmitted and received from the primary antenna by the secondary antenna. Is to execute.

Japanese Unexamined Patent Publication No. 2011-225051

When communicating by the electromagnetic induction method or the electromagnetic coupling method, a secondary antenna in which a loop antenna and a resonance capacitor are formed on a flexible substrate is used. However, the winding type antenna around which the covered conductor is wound becomes thicker due to the diameter of the conductor. On the other hand, in an antenna formed of metal foil or the like, in order to pull out both ends of the loop antenna wiring to one place, at least one end thereof may be routed to a surface opposite to the antenna surface through a through hole. It is necessary to route a bridge wiring that overcomes the antenna with an insulating layer sandwiched on the antenna surface side, which complicates the structure. Further, for the resonance capacitor, it is necessary to arrange the two electrode plates at a certain distance apart from each other, and the sheet to be attached to the movable door glass becomes thick. Therefore, the attached sheet may be peeled off by opening and closing the movable door glass. Furthermore, it is necessary to accurately control the shape and thickness of the antenna and the resonance capacitor in order to obtain appropriate resonance frequency characteristics.

The present disclosure has been made in view of such a situation, and a conductive layer that satisfactorily relays wireless communication performed between an in-vehicle communication device inside a vehicle and an external communication terminal by a relatively simple configuration is provided. An object of the present invention is to provide a booster seat and a wireless communication system.

The booster seat provided with the conductive layer according to the present embodiment is the in-vehicle communication device by relaying communication electromagnetic waves transmitted and received between the in-vehicle communication device provided in the vehicle and the communication terminal outside the vehicle. A booster sheet provided with a conductive layer capable of short-range wireless communication between and the communication terminal, which is provided on either the front or back surface of a non-conductive plate-like portion of the vehicle and is provided with the conductive layer. A part of the above, a flat plate portion extending in a plane, and a communication electromagnetic wave included in the in-vehicle communication device in a plan view along the normal line of any one of the non-conductive plate-like portions. An opening that is not a conductive layer that overlaps at least a part of the opening region of the coil of the antenna for transmission / reception, and another part of the conductive layer that extends from the flat plate portion so as to surround the opening. It is characterized by having a pair of protruding portions that are separated from each other and face each other.

Further, in the booster sheet according to another embodiment of the present embodiment, the non-conductive plate-shaped portion is a movable door glass, and the opening is the vehicle-mounted portion in the plan view when the door glass is closed. It may overlap with at least a part of the opening area of the coil of the antenna for transmitting and receiving the communication electromagnetic wave provided in the communication device.

Further, in the booster sheet according to another embodiment of the present embodiment, when the opening is the first opening and the pair of protrusions is the first protrusion, the second opening is different from the first opening. And a second protrusion extending from the flat plate portion so as to surround the second opening.

Further, in the booster seat according to another embodiment of the present embodiment, the second protruding portion may be a pair of protruding portions that are separated from each other and face each other.

The booster seat according to another embodiment of the present embodiment relays the communication electromagnetic waves transmitted and received between the vehicle-mounted communication device provided in the vehicle and the communication terminal outside the vehicle, thereby performing the vehicle-mounted communication device and the vehicle-mounted communication device. A booster sheet provided with a conductive layer capable of short-range wireless communication with a communication terminal, which is provided on either the front or back surface of a non-conductive plate-like portion of the vehicle, and the conductive layer is provided. The first conductive layer and the second conductive layer are separated and arranged so as to be separated from each other by a slit-shaped gap, and each of the first conductive layer and the second conductive layer is a part thereof and is flat. An antenna provided with a flat plate portion extending in a shape and for transmitting and receiving communication electromagnetic waves included in the in-vehicle communication device in a plan view along the normal line of any one of the non-conductive plate-shaped portions. It is characterized in that it overlaps with at least a part of the opening area of the coil.

Further, in the booster sheet according to another embodiment of the present embodiment, the non-conductive plate-shaped portion is a movable door glass, and the door glass is closed in each of the first conductive layer and the second conductive layer. In the state, it may overlap with at least a part of the opening region of the coil of the antenna for transmitting and receiving the communication electromagnetic wave included in the vehicle-mounted communication device in the plan view.

Further, in the booster sheet according to another embodiment of the present embodiment, the conductive layer may be provided with end faces along two sides orthogonal to each other.

Further, the booster sheet according to another embodiment of the present embodiment has a comb-shaped portion having a contour shape formed by repeated unevenness along a predetermined direction in which the conductive layer further extends from the flat plate portion in the plan view. You may prepare.

Further, in the booster sheet according to another embodiment of the present embodiment, the conductive layer may have a contour shape that is not line-symmetrical in the plan view.

Further, in the booster sheet according to another embodiment of the present embodiment, in the plan view, the conductive layer may have a straight line or curved contour shape in which the upper end has a constant inclination with respect to the left-right direction.

Further, in the booster sheet according to another embodiment of the present embodiment, the comb-shaped portion is different from the first side having the first inclination in the left-right direction at the upper end in the plan view and the first inclination. A convex portion formed by a second side having a second inclination, the first side and the second side being repeatedly arranged, and the first side and the second side. It may have a top and.

Further, the booster seat according to another embodiment of the present embodiment further includes a magnetic material sheet that at least partially overlaps the conductive layer in the plan view, and the magnetic material sheet is the inside of the vehicle of the booster sheet. It may be laminated on the surface side.

Further, the wireless communication system according to another embodiment of the present embodiment includes the booster sheet, the in-vehicle communication device provided with the first antenna for short-range wireless communication, and the second antenna for short-range wireless communication. In a wireless communication system composed of the communication terminal and the second antenna, a vortex current is generated in the conductive layer of the booster sheet from the magnetic flux generated from the first antenna or the second antenna, and the second antenna is generated. When the antenna is brought close to the end face of the conductive layer, the first antenna and the second antenna are indirectly coupled by electromagnetic induction, and the in-vehicle communication device and the communication terminal perform short-range wireless communication. It may be possible.

Further, the wireless communication system according to another embodiment of the present embodiment further includes an electronic control device provided in the vehicle, and the electronic control device receives a first ID code received from the communication terminal by the vehicle-mounted communication device. , The second ID code unique to the vehicle registered in the self is compared and collated, and when the first ID code and the second ID code match, the door lock of the vehicle is released. When the first ID code and the second ID code do not match, the door lock of the vehicle may not be released.

According to the present embodiment, a booster seat having a conductive layer and a wireless communication system that satisfactorily relay wireless communication performed between an in-vehicle communication device inside the vehicle and an external communication terminal by a relatively simple configuration are provided. Can be provided.

It is a side view of the vehicle which shows the arrangement of the booster seat which concerns on 1st Embodiment. It is an enlarged view near the front door, the reader / writer, and the booster seat of FIG. 1. It is sectional drawing around the booster seat which concerns on the front door. It is a schematic diagram which shows the arrangement of the magnetic material sheet in a booster sheet. It is explanatory drawing which shows the relationship between an eddy current and a magnetic flux. It is a block diagram which shows the schematic structure of the wireless communication system of 1st Embodiment. It is a figure near the booster seat which concerns on 2nd to 5th Embodiment. It is a figure near the booster seat which concerns on 6th to 9th Embodiment. It is a figure near the booster seat which concerns on 10th to 13th Embodiment. It is a figure near the booster seat which concerns on 14th Embodiment.

Hereinafter, an example of the booster seat of the present disclosure will be described with reference to the drawings and the like. However, the booster seat of the present disclosure is not limited to the apparatus according to the embodiment described below.

In addition, each figure shown below is shown schematically. Therefore, the size, shape, thickness of each layer in the cross-sectional view, etc. of each part are exaggerated as appropriate for easy understanding. Further, in each figure, hatching showing a cross section of the member is omitted as appropriate. Numerical values such as dimensions and material names of each member described in the present specification are examples of embodiments, and the present invention is not limited to these, and can be appropriately selected and used. In the present specification, terms that specify a shape or a geometric condition, such as parallel, orthogonal, and vertical, are used to include substantially the same state in addition to the exact meaning. Further, for convenience of explanation, the phrase "upper or lower" may be used for explanation, but the vertical direction may be reversed, and the same applies to the horizontal direction.

1. 1. First Embodiment A first embodiment, which is a typical example of the booster seat of the present disclosure, will be described. FIG. 2A is an enlarged view of the vicinity of the front door 2 of FIG. 2 (b) and 2 (c) are enlarged views of the vicinity of the reader / writer 5 and the booster seat 100 of FIG. 2 (a), respectively. Further, FIG. 3 is a cross-sectional view of the vicinity of the booster sheet 100 including the door glass 21 when the cross section cut along the line AA in the vertical direction of the booster sheet 100 of FIG. 2C is viewed from the right. The booster sheet 100 of FIG. 2C excludes the adhesive 121 and the base material 120 for convenience of explanation, and is displayed in such a manner that the conductive layer 130 is exposed.

As shown in FIGS. 1, 2 (a) and 3, a part of the booster seat 100 is attached on the surface of the door glass 21 of the front door 2 of the vehicle 1. The door glass 21 is movable so as to slide in the vertical direction, and is in a closed state with no gap from the outside of the vehicle 1 at a position where the door glass 21 is fully raised to the uppermost portion. The booster seat 100 is attached to the surface of the door glass 21 facing the inside of the vehicle 1. The booster seat 100 is provided on the door glass 21 in the present embodiment, but this is only an example, and the booster seat 100 can be provided on any non-conductive plate-shaped portion of the vehicle 1. The non-conductive plate-shaped portion does not necessarily have to be a transparent member such as glass, but if it is a transparent member, the arrangement of the booster sheet 100 is easy to see.

The booster sheet 100 is composed of a conductive layer 130 and a base material 120 that supports the conductive layer 130, and is fixed to the door glass 21 via an arbitrary adhesive 121. As shown in FIG. 3, the booster sheet 100 has a structure in which the base material 120 and the conductive layer 130 are laminated in this order with the adhesive 121 sandwiched from the side close to the door glass 21. Further, as will be described later, the booster sheet 100 may further include a magnetic material sheet 138 laminated on the surface of the conductive layer 130 opposite to the base material 120, if necessary.

A reader / writer 5, which is an in-vehicle communication device, is provided near the doorknob 22 of the front door 2 of the vehicle 1, and electromagnetic waves for communication are provided so as to enable short-range wireless communication with a communication terminal outside the vehicle 1. An antenna 52 or the like capable of transmitting and receiving is provided. However, since the reader / writer 5 is hidden inside the door trim 23 below the door glass 21 of the front door 2, it is affected by electromagnetic shielding by the metal frame of the front door 2. Therefore, it is difficult for the reader / writer 5 to directly communicate wirelessly with the communication terminal outside the vehicle 1.

In the present embodiment, a booster sheet 100 having a conductive layer 130 having a predetermined shape at a position close to the reader / writer 5 is provided in a region above the door trim 23 of the closed door glass 21. Further, as will be described later, the booster seat 100 is for efficient communication with a communication terminal outside the vehicle 1 by utilizing the eddy current generated in the conductive layer 130, despite the relatively simple configuration. It can transmit electromagnetic waves. Therefore, the communication electromagnetic wave transmitted and received between the reader / writer 5 and the communication terminal can be satisfactorily relayed.

As described above, the electronic control device of the vehicle 1 compares and collates the ID code received by the reader / writer 5 from the communication terminal that has undergone mutual authentication or the like with the unique ID code of the vehicle 1 that it stores. As a result, when the two match, the electronic control device determines that the user of the communication terminal is a legitimate user of the vehicle 1, and unlocks or locks the door of the vehicle 1. Further, it is also possible to control the on / off of the engine drive unit of the vehicle 1 according to this determination. Hereinafter, the configuration of the wireless communication system including the vehicle 1 and the communication terminal will be described with a focus on the configuration of the reader / writer 5 and the booster seat 100.

[A] Reader / Writer The reader / writer 5 performs a function of transmitting information from a communication terminal outside the vehicle 1 to an electronic control unit (ECU) of the vehicle 1 and short-range wireless communication with the communication terminal for that purpose. It has at least a function. As illustrated in FIG. 2B, the reader / writer 5 includes a configuration in which an IC chip 54 and an antenna 52 forming a communication circuit 51 are provided on the surface of the substrate 53. The IC chip 54 has an element capable of simple input / output, calculation, control, etc., which is a so-called microcomputer equipped with a CPU or MPU, an input / output unit, a memory, etc., and is close to a communication terminal via an antenna 52. It has a non-contact communication interface for range wireless communication.

However, the reader / writer 5 does not have the IC chip 54, and the wiring at both ends of the antenna 52 is extended, and may be directly connected to the control circuit of the electronic control device. Further, although not shown, the reader / writer 5 may include a resonance capacitor for optimizing the communication frequency in short-range wireless communication with a communication terminal.

As shown in FIGS. 2A and 3, the reader / writer 5 is arranged inside the door trim 23 of the front door 2, that is, in a region below the rubber 24 of the door trim 23. The reader / writer 5 is attached to the inner surface of the frame facing the outside of the vehicle 1 of the door trim 23 so that the distance from the door handle 22 including the door lock operation portion inside is shortened. As a result, the configuration of the reader / writer 5 can be miniaturized and simplified, and the wiring between the door lock operation unit and the reader / writer 5 can be shortened. However, the reader / writer 5 may be attached to the inner surface or the outer surface, that is, the indoor side of the frame facing the inside of the vehicle 1 of the door trim 23.

The antenna 52 of the reader / writer 5 serves as a primary antenna for short-range wireless communication with a communication terminal outside the vehicle 1, and the booster sheet 100 serves as a communication terminal with the antenna 52 of the reader / writer 5 as described later. Serves as a secondary antenna or booster antenna to relay communication with. As short-range wireless communication between the reader / writer 5 and the communication terminal, a proximity wireless system compliant with the ISO18000-3 standard, which performs non-contact communication within a few centimeters at a frequency in the HF band such as 13.56 MHz, is mentioned. be able to. In addition, a UHF method using a frequency band of about 900 MHz capable of supporting non-contact communication from several cm to several m can be mentioned.

However, in the UHF method, the communication range can be narrowly limited because the leakage of radio waves to the surroundings of the vehicle 1 is large and there is room for malfunction of other vehicles in the vicinity and skimming of radio waves by an unauthorized third party. It is preferable to communicate at a frequency in the HF band such as 56 MHz. In this case, the antenna 52 is preferably a loop antenna because the communication mode is an electromagnetic induction method or an electromagnetic coupling method. However, when another communication frequency band is adopted, the present invention is not limited to this, and a dipole antenna, a monopole antenna, or the like may be used.

[B] Booster Sheet [i] Base Material The base material 120 is a flexible film having an insulating property for supporting the conductive layer 130, and for example, any resin film having a thickness of 5 μm or more and 5 mm or less can be used.

[Ii] Conductive layer As described later, any member having conductivity such that an appropriate eddy current can be generated when a change in a magnetic field is received can be applied to the conductive layer 130. For example, a foil of copper or aluminum may be used, or the foil may be formed by vacuum deposition of aluminum or the like or printing or coating of a conductive ink containing conductive particles such as silver particles. In addition to metal, a conductive film such as a graphite film may be used. The thickness of the conductive layer can be, for example, 1 μm or more and 1 mm or less, but preferably 1 μm or more and 100 μm or less.

As a result, by reducing the thickness of the base material, a booster sheet having appropriate conductivity as a conductive layer that satisfactorily relays short-range wireless communication performed between the reader / writer 5 inside the vehicle 1 and the external communication terminal. 100 is obtained. Further, by reducing the overall thickness of the booster sheet 100, it is possible to prevent the booster sheet 100 from peeling off due to frictional resistance from the rubber 24 even if the door glass 21 is repeatedly opened and closed.

As shown in FIGS. 2A and 3, when the door glass 21 is closed, approximately half of the upper side of the conductive layer 130 of the booster seat 100 is above the upper end of the door trim 23 of the front door 2. It pops out and is arranged so that approximately half of the lower side is housed inside the door trim 23. The door glass 21 and the booster seat 100 can be seen from the outside of the vehicle 1 only when they are above the rubber 24 at the upper end of the door trim 23.

When the periphery of the booster sheet 100 is viewed in a plan view along the normal of either the front or back surface of the door glass 21, the conductive layer 130 of the booster sheet 100 has a substantially rectangular shape as a whole as shown in FIG. 2 (c). It has become. Further, it has a shape having a substantially rectangular shape smaller than this and having an opening 133 in which a notch 139 is formed downward. In other words, the conductive layer 130 extends above the flat plate portion 131 extending in a substantially rectangular planar shape, the opening portion 133, and extends from the flat plate portion 131 so as to surround the opening portion 133, and is separated from each other and faces each other. A pair of protrusions 132 and a pair of protrusions 132 are provided. The protrusions 132a and 132b are arranged so as to face each other with the notch 139 of the opening 133 interposed therebetween. The base material 120 may have a shape having the same openings and protrusions as the conductive layer 130, or may have a substantially rectangular shape including the region of the conductive layer 130.

When the door glass 21 is in the closed state, at least a part of the opening region of the coil of the antenna 52 included in the reader / writer 5 is the opening 133 in a plan view along the normal of either the front or back surface of the door glass 21. It overlaps, preferably the entire opening region of the coil of the antenna 52 overlaps the opening 133. When the opening region of the coil of the antenna 52 overlaps with the opening 133 that is not the conductive layer 130, the magnetic flux passing through the opening region of the coil of the antenna 52 directly hits the conductive layer 130 to generate an eddy current, and the booster sheet 100. It is possible to suppress the occurrence of power loss on the lower side.

Further, at the lower end of the booster sheet 100, the conductive layer 130 extends from the flat plate portion 131 so as to surround the opening 133, and is provided with a pair of protruding portions 132 that are separated from each other and face each other on the lower side of the conductive layer 130. Since the flow of the eddy current in the vortex current can be divided, the generation of the eddy current on the lower side of the conductive layer 130 and the power loss due to the eddy current can be suppressed.

[Iii] Magnetic material sheet The magnetic material sheet 138 laminated on the conductive layer 130 as needed is, for example, a ferrite sheet or the like, and as an example, the thickness can be 5 μm or more and 2 mm or less. The arrangement of the magnetic sheet 138 with respect to the booster sheet 100 in the above-mentioned plan view is shown in FIGS. 4 (a) and 4 (b). The magnetic sheet 138 may be arranged in a substantially rectangular shape including the region of the conductive layer 130 as shown in FIG. 4 (a), or may be arranged in a substantially rectangular shape as shown in FIG. 4 (b). It may be arranged only in the portion surrounding the periphery except 139.

When the booster sheet 100 includes the magnetic material sheet 138 laminated on the surface of the conductive layer 130 opposite to the base material 120, the magnetic flux generated from the coil of the antenna 52 of the reader / writer 5 is a metal body other than the conductive layer 130. It is possible to suppress the loss caused by the generation of a tertiary magnetic field. Further, due to the reflection effect of the magnetic flux by the magnetic material sheet 138, the magnetic field can be efficiently radiated from the conductive layer 130 toward the communication terminal 10 outside the vehicle 1.

[C] Action of Booster Sheet Next, the action of the booster seat 100 will be described. As shown in FIG. 5A, it is assumed that a magnetic flux MF11 parallel to the flat conductor plate 200 along the normal of the main surface of the conductor plate 200 exists. When the conductor plate 200 is translated with respect to the main surface so as to block the magnetic flux MF11, as shown in FIG. 5B, according to Fleming's left-hand rule, according to the amount of change in the magnetic flux MF11 across the conductor plate 200. A substantially arc-shaped eddy current EC11 is generated along the main surface. Further, this eddy current EC11 generates a new magnetic flux MF12 distributed in a direction that cancels the magnetic flux MF11.

As a result, as shown in FIG. 5C, the original magnetic flux MF 11 has the highest magnetic flux density near the upper end of the conductor plate 200 so as to avoid the magnetic flux MF 12 generated in the opposite direction by the eddy current EC11. The magnetic flux changes to MF13. Here, the conductor plate 200 is replaced with the conductive layer 130 of the booster sheet 100, the magnetic flux MF11 is replaced with the magnetic flux RW11 of the electromagnetic wave transmitted from the antenna 52 of the reader / writer 5, and the magnetic flux MF13 is replaced with the electromagnetic wave transmitted from the end face of the conductive layer 130. Replaced with the magnetic flux RW12 of.

In this case, the electromagnetic wave RW11 transmitted from the reader / writer 5 is emitted as the magnetic flux RW12 in which the magnetic field is further enhanced at the end of the conductive layer 130. Therefore, by bringing the antenna of the external communication terminal close to the end of the conductive layer 130, the communication between the reader / writer 5 and the communication terminal becomes good. That is, the booster sheet 100 can satisfactorily relay the communication electromagnetic waves transmitted and received between the reader / writer 5 and the communication terminal.

By providing the conductive layer 130 of the booster sheet 100 with the above-mentioned shape, it is possible to suppress the generation of unnecessary eddy currents on the lower side of the conductive layer 130, and the eddy currents concentrated near the flat plate portion 131 on the upper side of the conductive layer 130. Can be promoted. As a result, even if the antenna 52 of the reader / writer 5 is hidden inside the door trim 23, the communication terminal is simply brought close to the upper end surface and the left and right end surfaces of the flat plate portion 131 of the conductive layer 130 extended above the door trim 23. Good short-range wireless communication can be easily performed between the reader / writer 5 and the communication terminal. The end face refers to the side surface of the portion that becomes the contour of the conductive layer 130 when the conductive layer 130 is viewed in the above-mentioned plan view.

The above-mentioned effect is similar to the effect of enhancing and transmitting the electromagnetic wave transmitted from the antenna 52 of the reader / writer 5 by the booster antenna attached to the non-conductive plate-shaped portion. However, the booster antenna when communicating by the electromagnetic induction method or the electromagnetic coupling method needs to be a loop antenna like the antenna 52, and also needs to form a resonance capacitor. In this case, as described above, the structure of the booster antenna and the circuit becomes complicated, and the accuracy of the antenna shape and the thickness is required. Further, when the non-conductive plate-shaped portion is a movable door glass, the sheet attached to the door glass becomes thick, which causes the booster antenna to peel off due to opening and closing.

On the other hand, the booster sheet 100 of the present embodiment receives the electromagnetic wave transmitted from the antenna 52 of the reader / writer 5 and generates an eddy current concentrated in the vicinity of the upper flat plate portion 131 of the conductive layer 130. As a result, a strong magnetic flux can be generated above the flat plate portion 131 and in the vicinity of the left and right end faces. As a result, good short-range wireless communication can be performed with the communication terminals arranged in the vicinity. In this case, the shape of the conductive layer 130 does not require any particular accuracy and can be easily manufactured. Further, since the thickness can be made as thin as possible without impairing the conductivity, when the non-conductive plate-shaped portion where the booster sheet 100 is provided is a movable door glass, the booster sheet is repeatedly opened and closed. Can suppress the peeling of the glass.

Further, the booster sheet 100 includes the magnetic material sheet 138 laminated on the surface of the conductive layer 130 opposite to the base material 120, thereby reducing the loss of the magnetic field generated from the coil of the antenna 52 of the reader / writer 5. A magnetic field can be efficiently radiated from the conductive layer 130 toward the communication terminal 10.

[D] Wireless Communication System Next, an outline of the wireless communication system including the booster sheet 100 and the reader / writer 5 described above will be described. As shown by the broken line frame in FIG. 6, the wireless communication system 300 may be configured to include at least a booster sheet 100, a reader / writer 5, and a communication terminal 10, and may further include an electronic control device 4.

[I] Communication terminal As described above, the communication terminal 10 can relay the booster seat 100 from the outside of the vehicle 1 to perform short-range wireless communication with the reader / writer 5 of the vehicle 1, for example, an NFC communication function. An example of a equipped smartphone can be illustrated. The communication terminal 10 includes at least a terminal antenna 11 for transmitting and receiving communication electromagnetic waves and a control unit 12 for performing various controls. The control unit 12 includes a CPU or MPU, an input / output unit, a memory, etc., and has elements such as an IC chip capable of input / output, calculation, control, etc., and is connected to the reader / writer 5 via the terminal antenna 11. It has a non-contact communication interface for short-range wireless communication.

[Ii] Electronic control device The electronic control unit (ECU) 4 performs mutual authentication between the reader / writer 5 and the communication terminal 10, an ID code acquired by the reader / writer 5 from the communication terminal 10, and a vehicle 1 stored by itself. Compare and collate with the unique ID code of. As a result, when the two match, it is determined whether or not the user of the communication terminal 10 is a legitimate user of the vehicle 1. Further, the electronic control device 4 unlocks and locks the door lock of the vehicle 1 based on the determination. Further, it is also possible to control the on / off of the engine drive unit of the vehicle 1 based on this determination.

The electronic control device 4 mainly includes at least an authentication unit 42 that performs mutual authentication and comparison and collation with an ID code, and a control unit 41 that controls a door lock and an engine drive unit. The electronic control device 4 does not need to be centrally arranged in one place, and the reader / writer 5 is provided with mutual authentication between the reader / writer 5 and the communication terminal 10 and comparison and collation of the ID code acquired from the communication terminal 10. It may be performed by only one electronic control device, and other processing may be performed by another electronic control device separate from this.

[Iii] Door lock drive unit and engine drive unit The door lock drive unit 6 is provided inside a door trim 23 near the door handle 22 of the front door 2, and the door lock is released or locked according to an instruction from the electronic control device 4. It is a part to carry out. Further, the engine drive unit 7 starts the engine when the user presses the start button inside the vehicle 1, prevents the engine from starting, or automatically starts the engine according to an instruction from the electronic control device 4. It is a part that stops the engine of. The door lock drive unit 6 and the engine drive unit 7 are not essential components of the wireless communication system 300.

[E] Operation of the wireless communication system Next, an example of the operation of the wireless communication system 300 will be described. The reader / writer 5 provided inside the door trim 23 of the front door 2 of the vehicle 1 constantly or intermittently transmits an inquiry signal by electromagnetic waves having an NFC communication frequency via the antenna 52. The magnetic flux of the electromagnetic wave crosses the conductive layer 130 of the booster sheet 100 provided on the door glass 21 in the vicinity of the antenna 52. As a result, an eddy current is generated in the vicinity of the flat plate portion 131 on the upper side of the conductive layer 130. Therefore, as described above, a relatively strong magnetic flux is generated near the end face of the conductive layer 130, and the terminal antenna 11 and the antenna 52 of the user's communication terminal 10 brought close to this are indirectly electromagnetically induced. Combine with.

If necessary, the communication terminal 10 that has received the inquiry signal from the reader / writer 5 may perform mutual authentication with the electronic control device 4 via the reader / writer 5. For example, the communication terminal 10 and the electronic control device 4 have K1 and K2, which are common encryption keys, respectively. The communication terminal 10 transmits an appropriate random number R1 generated by itself and a value C1 = K1 (R1) obtained by encrypting the random number R1 with its own encryption key K1 to the electronic control device 4 via the reader / writer 5. .. Note that P (X) refers to data obtained by encrypting X with P, and P ^-1 (X) refers to data obtained by decrypting X with P. The electronic control device 4 transmits the received R1 and C1 to the authentication unit 42, and obtains a value D1 = ^K2-1 (C1) obtained by decrypting C1 with its own encryption key K2.

Next, the authentication unit 42 compares and collates whether or not D1 is the same as R1, authenticates that the communication terminal 10 is valid if it is the same, and rejects the authentication because the communication terminal 10 is not valid if it is different. On the other hand, the electronic control device 4 also transmits a random number and data obtained by encrypting the random number to the communication terminal 10, and determines whether or not the communication terminal 10 authenticates the electronic control device 4 based on the result. After these steps, if both of them succeed in authentication, mutual authentication is completed.

Subsequently, the communication terminal 10 that has received another inquiry signal from the reader / writer 5 transmits the value E1 = K1 (ID1) obtained by encrypting the ID code ID1 owned by the reader / writer 5 with the encryption key K1 via the reader / writer 5. It is transmitted to the electronic control device 4. The authentication unit 42 obtains a value F1 = ^K2-1 (E1) obtained by decrypting the received E1 with its own encryption key K2. Next, the authentication unit 42 reads out the unique ID code ID2 of the vehicle 1 registered in itself, compares and collates whether F1 and ID2 are the same, and if they are the same, the ID code ID1 of the communication terminal 10. Is justified and is certified as having the right to use the vehicle 1, and if not, the certification is rejected.

When authenticated, the authentication information is transmitted to the control unit 41, and a command to release or lock the door lock is issued to the door lock drive unit 6. As a result, the user can unlock or lock the door lock by simply holding his / her communication terminal 10 near the door handle 22 of the front door 2. On the other hand, if the authentication fails, the control unit 41 does not issue a command to release or lock the door lock to the door lock drive unit 6.

Further, when the authentication unit 42 succeeds in authenticating the ID code ID 1 received from the communication terminal 10, the authentication information is transmitted from the control unit 41 to the engine drive unit 7, and when the user operates the engine start button, the authentication information is transmitted to the engine drive unit 7. , You will be able to drive the engine. Further, when the authentication of the ID code ID1 fails, even if the user opens the front door 2 of the vehicle 1 and gets inside, the engine can be driven when the user operates the start button of the engine. Can not.

Mutual authentication may be omitted. Further, the above-mentioned ID code authentication is exemplified based on a common key method in which the electronic control device 4 and the communication terminal 10 have a common encryption key. However, not limited to this, the electronic control device 4 and the communication terminal 10 each hold a key pair of a public key and a private key that are different from each other, and a key certificate issued by a certification authority that guarantees the public key. It may be based on the key method, or may be a method in which both methods are combined.

As described above, the wireless communication system 300 of the present embodiment uses a booster sheet having a relay effect of transmitted / received electromagnetic waves similar to that of a booster antenna using a coil antenna, while having a simple configuration and being easily manufactured. As a result, an eddy current is generated in the conductive layer 130 of the booster sheet 100 from the magnetic flux generated from the terminal antenna 11 of the antenna 52 which is the first antenna of the reader / writer or the communication terminal 10 which is the second antenna. At this time, when the second antenna of the communication terminal 10 is brought close to the end surface of the conductive layer 130, the first antenna and the second antenna are indirectly coupled by electromagnetic induction. Therefore, by including the configuration of the booster seat 100 of the present embodiment, the reader / writer 5 and the communication terminal 10 can easily perform short-range wireless communication satisfactorily.

Further, the electronic control device 4 provided in the vehicle 1 compares and collates the first ID code received by the reader / writer 5 from the communication terminal 10 with the second ID code unique to the vehicle registered in itself. Then, when the first ID code and the second ID code match, the door lock of the vehicle 1 is released, and when the first ID code and the second ID code do not match, the vehicle 1 is released. Decide not to unlock the door. Therefore, by including the configuration of the booster seat 100 of the present embodiment, the door can be easily unlocked and locked according to the communication result between the reader / writer 5 and the communication terminal 10, and the convenience of the user is improved. ..

2. 2. Second Embodiment Next, a second embodiment, which is another example of the booster seat of the present disclosure, will be described. FIG. 7A is an enlarged view of the vicinity of the booster seat 101 of the second embodiment corresponding to FIG. 2C. It should be noted that the figures relating to the subsequent embodiments are the same. The booster sheet 101 is different from the booster sheet 100 of the first embodiment in that the shape on the upper side thereof is substantially axisymmetric with respect to the straight line in the left-right direction in the above-mentioned plan view.

That is, the conductive layer 130 of the booster sheet 101 includes a flat plate portion 131 extending in a plane at substantially the center in the vertical direction. Further, on the lower side thereof, similarly to the booster sheet 100, an opening 133 and a pair of protruding portions 132a and 132b extending from the flat plate portion 131 so as to surround the opening 133 and facing each other are provided. .. Further, the conductive layer 130 also has an opening 134 extending above the flat plate portion 131 and a pair of protruding portions 132c and 132d extending from the flat plate portion 131 so as to surround the opening 134 and facing each other. Be prepared. The protrusions 132c and 132d are arranged so as to face each other with the notch 139b of the opening 134 interposed therebetween.

Since the conductive layer 130 of the booster sheet 101 has such a shape, the flow of eddy currents on the lower side and the upper side of the conductive layer 130 is divided, and the eddy currents are concentrated substantially in the center of the conductive layer 130 in the vertical direction. Can be generated. Therefore, it is possible to suppress the generation of eddy currents on the lower side and the upper side of the conductive layer 130 and the power loss due to the eddy currents.

Further, by providing the opening 134 and the protrusions 132c and 132d on the upper side of the conductive layer 130, the surface area of the end face of the conductive layer 130 is increased. Further, as end faces, a plane parallel to the vertical direction and a plane parallel to the horizontal direction can be formed along two sides orthogonal to each other, and for good short-range wireless communication between the communication terminal 10 and the reader / writer 5. The allowable range of the position and angle of the communication terminal 10 with respect to the booster seat 101 can be expanded.

By increasing the surface area of the end face of the conductive layer 130, the portion where the magnetic flux of the electromagnetic wave transmitted from the reader / writer 5 is strong can be widely dispersed around the conductive layer 130, and the end face having parallel surfaces in the vertical and horizontal directions causes the electromagnetic wave. The directivity of is widened. In general, it is considered that providing each end face along two sides orthogonal to each other has a high effect of complementing each other in the strength of the magnetic field generated in the vicinity of the end face.

3. 3. Third Embodiment Next, a third embodiment, which is another example of the booster seat of the present disclosure, will be described. FIG. 7B is an enlarged view of the vicinity of the booster seat 102 of the third embodiment. In the above-mentioned plan view, the booster sheet 102 is different from the booster sheet 101 of the second embodiment in that the protrusion 132d of the pair of protrusions 132c and 132d is not provided. The booster sheet 102 has a contour shape in which the conductive layer 130 is not line-symmetrical.

The conductive layer 130 of the booster sheet 102 includes a flat plate portion 131 extending in a plane substantially in the center, and the configuration on the lower side thereof is the same as that of the booster sheets 100 and 101. Further, the conductive layer 130 includes an opening 135 whose right side is open on the upper side of the flat plate portion 131, and a protruding portion 132c extending from the flat plate portion 131 so as to surround the left side of the opening portion 135.

Since the conductive layer 130 of the booster sheet 102 has such a shape, the protruding portion 132c extending from the flat plate portion 131 to surround the left side of the opening 135 not only on the lower side of the conductive layer 130 but also on the upper side. Be prepared. As a result, the flow of eddy currents on the lower side and the upper side of the conductive layer 130 is divided, and the eddy currents can be concentrated and generated at substantially the center in the vertical direction of the conductive layer 130. Further, the conductive layer 130 has a contour shape that is not line-symmetrical. Therefore, it is possible to suppress the generation of eddy currents on the lower and upper sides of the conductive layer 130 and the power loss due to this, and the symmetry of the magnetic fields generated near the end face of the conductive layer 130 is broken, so that the magnetic fields are symmetrically distributed in opposite directions. The loss that cancels each other out is suppressed. As a result, the communication terminal 10 and the reader / writer 5 can be efficiently coupled by electromagnetic induction.

4. Fourth Embodiment Next, a fourth embodiment, which is another example of the booster seat of the present disclosure, will be described. FIG. 7C is an enlarged view of the vicinity of the booster seat 103 of the fourth embodiment. In the above-mentioned plan view, the booster sheet 103 is different from the booster sheet 100 of the first embodiment in that the booster sheet 103 is provided with an opening 136 having a notch opened to the right in the substantially center of the conductive layer 130 in the vertical direction. .. The upper side of the conductive layer 130 is provided with a relatively large flat plate portion 131, the lower side is provided with the same configuration as the booster sheet 100, etc., and the upper side and the lower side are provided with a narrow passage 136a scooped out by the opening 136. It is connected.

Since the conductive layer 130 of the booster sheet 103 has such a shape, the generation of eddy currents in the lower side and substantially the center in the vertical direction is restricted as much as possible, and the conductive layer 130 is concentrated on the flat plate portion 131 on the upper side. Eddy current and magnetic field generation are achieved. Further, the flat plate portion 131 has a large end face not only at the upper end, the left end and the right end, but also at the lower end which is the boundary with the opening 136. Further, since the conductive layer 130 has the opening 136, it has a contour shape that is not line-symmetrical. Therefore, a strong magnetic field can be formed on the upper, lower, left, and right end faces of the flat plate portion 131 on the upper side of the conductive layer 130, and the communication terminal 10 and the reader / writer 5 can be efficiently coupled by electromagnetic induction together with the loss suppression by the asymmetric structure.

5. Fifth Embodiment Further, a fifth embodiment which is another example of the booster seat of the present disclosure will be described. FIG. 7D is an enlarged view of the vicinity of the booster seat 104 of the fifth embodiment. In the above-mentioned plan view, the booster sheet 104 extends along the vertical direction in which the conductive layer 130 further extends upward from the flat plate portion 131 substantially at the center in the vertical direction with respect to the booster sheet 100 of the first embodiment. The difference is that the contour-shaped comb-shaped portion 151 formed by the repeated unevenness is provided. In the comb-shaped portion 151, the convex portions 151a and the concave portions 151b are repeatedly arranged along the left-right direction, and each forms a convex shape and a concave shape along the vertical direction. Each end face of the convex shape of the convex portion 151a and the concave shape of the concave portion 151b has a surface parallel to the vertical direction and a surface parallel to the horizontal direction along two sides orthogonal to each other.

Since the conductive layer 130 of the booster sheet 104 has such a shape, the generation of the eddy current on the lower side is restricted as much as possible in the conductive layer 130, and the eddy current is concentrated on the flat plate portion 131 substantially in the center in the vertical direction. A magnetic field is generated. Further, by providing 7 comb-shaped portions 151 having an uneven shape toward the upper side of the flat plate portion 131, the surface area of the end face of the conductive layer 130 can be remarkably increased, and the magnetic field formed by the electromagnetic wave transmitted from the reader / writer 5 is conducted. It can be distributed more widely around the layer 130, and the directivity of the electromagnetic wave can be further expanded.

6. Sixth Embodiment A sixth embodiment, which is another example of the booster seat of the present disclosure similar to the fifth embodiment, will be described. FIG. 8A is an enlarged view of the vicinity of the booster seat 105 of the sixth embodiment. In the above-mentioned plan view, the booster sheet 105 is formed by repeating unevenness along the left-right direction in which the conductive layer 130 further extends from the flat plate portion 131 on the left side to the right side with respect to the booster sheet 104 of the fifth embodiment. The difference is that the contour-shaped comb-shaped portion 152 is provided.

Since the conductive layer 130 of the booster sheet 105 has such a shape, the conductive layer 130 can form a magnetic field in a range different from that of the booster sheet 105 around the conductive layer 130. Specifically, in the booster sheet 105, a stronger magnetic field can be formed on the right side of the conductive layer 130 than on the left side due to the difference in the surface area of the end surface of the conductive layer 130. Further, since the conductive layer 130 has a contour shape that is not axisymmetric, the effect of suppressing loss due to the asymmetric structure can also be obtained.

7. Seventh Embodiment A seventh embodiment, which is another example of the booster seats of the present disclosure similar to the fifth and sixth embodiments, will be described. FIG. 8B is an enlarged view of the vicinity of the booster seat 106 of the seventh embodiment. In the above-mentioned plan view, the booster seat 106 is different from the booster seats 104 and 105 of the fifth and sixth embodiments as follows. That is, the booster sheet 106 is a second comb-shaped portion having a contour shape formed by repeated unevenness along the left-right direction, which extends further to the left from the flat plate portion 131 on the right side in the substantially center of the conductive layer 130 in the vertical direction. 154 is provided. Further, on the upper side of the conductive layer 130, a first comb-shaped portion 153 having a contour shape formed by repeated unevenness along the left-right direction is provided, which extends further to the right from the flat plate portion 131 on the left side.

Since the conductive layer 130 of the booster sheet 106 has such a shape, the conductive layer 130 can form a magnetic field in a range different from that of the booster sheets 104 and 105 around the conductive layer 130. Specifically, in the booster sheet 106, a stronger magnetic field can be formed on the left side than the right side at the substantially center in the vertical direction of the conductive layer 130, and a stronger magnetic field can be formed on the right side than the left side on the upper side of the conductive layer 130. Can be formed. That is, it is possible to impart a complicated characteristic that the distribution of the strength of the magnetic field fluctuates in the left-right direction along the vertical direction of the conductive layer 130. Further, even in this case, since the conductive layer 130 has a contour shape that is not axisymmetric, loss suppression due to the asymmetric structure can be obtained.

The configuration of the conductive layer 130 of the booster sheet 106 is not limited to this, for example, the substantially center of the conductive layer 130 in the vertical direction is the configuration of the first comb-shaped portion 153, and the upper side of the conductive layer 130 is the second comb-shaped. It may be configured as a unit 154. Further, the configurations of the first comb-shaped portion 153 and the second comb-shaped portion 154 may be repeatedly arranged along the vertical direction.

8. Eighth Embodiment Next, the eighth embodiment, which is another example of the booster seat of the present disclosure, which has a slightly different configuration from the first to seventh embodiments, will be described. FIG. 8C is an enlarged view of the vicinity of the booster seat 107 of the eighth embodiment. In the above-mentioned plan view, the conductive layers of the booster sheet 107 are separated and arranged in the first conductive layer 130a and the second conductive layer 130b which are separated from each other by a slit-shaped gap 137 having a narrow width and face each other.

Each of the first conductive layer 130a and the second conductive layer 130b extends as a substantially rectangular and flat first flat plate portion 131a and a second flat plate portion 131b, and when the door glass 21 is closed, the reader / writer 5 It overlaps with at least a part of the opening area of the coil of the antenna 52 of the above. That is, while the conductive layer is insulated and separated into two pieces, it does not have an opening on the lower side or a pair of protrusions extending so as to surround the opening and facing each other apart from each other. Different from the embodiment.

By separately arranging the conductive layer of the booster sheet 107 as the first conductive layer 130a and the second conductive layer 130b with the gap 137 separated from each other, the opening and the opening can be provided in the region facing the antenna 52 of the reader / writer 5. It extends so as to surround it, eliminating the need for a pair of protrusions that are separated from each other and face each other. This is because the first conductive layer 130a and the second conductive layer 130b do not conduct with each other, so that it is possible to suppress the generation of a large eddy current that straddles both.

Further, the magnetic field generated from the antenna 52 of the reader / writer 5 generates a small eddy current in each of the first conductive layer 130a and the second conductive layer 130b, and causes a small eddy current in each of the first conductive layer 130a and the second conductive layer 130b. A strong magnetic field is generated near the leftmost end face of the layer 130b. Therefore, as compared with the case where the conductive layer is not separately arranged, the magnetic field formed by the electromagnetic wave transmitted from the reader / writer 5 is generated around the conductive layer 130 by increasing the surface area of the end face of the conductive layer while simplifying the shape and structure. Can be widely distributed.

9. Ninth Embodiment Next, a ninth embodiment, which is similar to the eighth embodiment and is another example of the booster seat of the present disclosure, will be described. FIG. 8D is an enlarged view of the vicinity of the booster seat 108 of the ninth embodiment. The booster sheet 108 follows the configuration of the separated arrangement of the conductive layer of the booster sheet 107 described above, and further extends along the left-right direction from the flat plate portion 131c on the left side to the upper side of the first conductive layer 130a. A first comb-shaped portion 155 having a contour shape formed by repeated unevenness is provided. Further, a second comb-shaped portion 156 having a contour shape formed by repeated unevenness along the left-right direction is provided at substantially the center of the second conductive layer 130b in the vertical direction, extending further to the left from the flat plate portion 131d on the right side.

Since the conductive layer 130 of the booster sheet 108 has such a shape, the booster sheet 108 of the present embodiment exhibits the same operation as the booster sheet 107, and the first conductive layer 130a and the second conductive layer 130b have the same shape. A magnetic field in a range different from that of the booster sheet 107 can be formed around the booster sheet 107. That is, a stronger magnetic field can be formed on the upper side of the first conductive layer 130a in the substantially center in the left-right direction than on the left side, and in the substantially center in the vertical direction of the second conductive layer 130b, in the substantially center in the left-right direction than on the right side. A stronger magnetic field can be formed.

That is, a strong magnetic field can be formed in the vicinity of the gap 137 substantially in the center of the booster sheet 108 in the left-right direction, and a complicated characteristic can be imparted such that the strength of the magnetic field fluctuates in the left-right direction along the up-down direction. Further, also in this case, since the entire conductive layer has a contour shape that is not axisymmetric, the effect of suppressing loss due to the asymmetric structure can be obtained. As for the booster sheet 108, similarly to the booster sheet 106, the position and the number of comb-shaped portions formed on the first conductive layer 130a and the second conductive layer 130b may be appropriately changed.

10. Tenth Embodiment The tenth to thirteenth embodiments described below are examples of variations in the contour shape of the upper end of the conductive layer 130 in the booster sheet 100 of the first embodiment. FIG. 9A is an enlarged view of the vicinity of the booster seat 109 of the tenth embodiment. In the above-mentioned plan view, the booster sheet 109 has the contour shape of the inclined portion 141 in which the upper end of the conductive layer 130 is a straight line having a constant inclination with respect to the left-right direction, that is, the booster sheet 100 of the first embodiment. Is different.

That is, in the conductive layer 130 of the booster sheet 109, the highest position at the upper end is the top 141a at the left end, and the lowest position at the upper end is the bottom 141b at the right end. It has a contour shape. However, the straight line may rise to the right, and the inclination angle thereof can be arbitrarily determined. Since the conductive layer 130 of the booster sheet 109 has such a shape, the end surface can form a surface parallel to the vertical direction and a surface parallel to the diagonal direction along two sides that are not orthogonal to each other, and the magnetic field of the conductive layer 130 can be formed. Can be different from that of the first embodiment.

Further, when opening and closing the door glass 21 up and down, the door glass 21 and the booster seat 109 provided therein may come into contact with the rubber 24 provided at the upper end of the door trim 23. Here, the upper end of the booster sheet 109 including the base material 120 can be formed so as to have the contour shape of the inclined portion 141 which is a straight line having a constant inclination with respect to the left-right direction, similarly to the upper end of the conductive layer 130. By doing so, it is possible to reduce the frictional force received by the end face of the booster sheet 109 from the rubber 24 when the door glass 21 is opened and closed.

If the upper end of the booster seat has a linear contour shape parallel to the left-right direction, the end face extending over the entire width of the booster seat comes into contact with the rubber 24 and receives a large frictional force. However, in the booster sheet 109 of the present embodiment, when the door glass 21 is closed upward, only the end portion corresponding to the top 141a of the conductive layer 130 first contacts the rubber 24, and then the contact points sequentially move to the right. Finally, only the end portion corresponding to the bottom portion 141b comes into contact with the rubber 24. The opposite is true when the door glass 21 is opened downward. Therefore, the damage received by the booster sheet 109 due to the repeated opening and closing of the door glass 21 is relatively smaller than in the former case, and as a result, deterioration and peeling of the booster sheet 109 can be suppressed.

11. The eleventh embodiment FIG. 9B is an enlarged view of the vicinity of the booster seat 110 of the eleventh embodiment. The booster seat 110 is provided with a comb-shaped portion 142 at the upper end in the above-mentioned plan view. However, its shape is different from that of the comb-shaped portion 151 of the booster sheet 104. The comb-shaped portion 142 has a first side 142s whose upper end has a first inclination with respect to the left-right direction, a second side 142t having a second inclination different from the first inclination, and a first side 142s and a first side. The two sides 142t are repeatedly arranged, and the top portion 142a of the convex portion formed by the first side 142s and the second side 142t is provided as a contour shape.

Further, the contour shape of the comb-shaped portion 142 has a concave portion bottom portion 142b corresponding to the top portion 142a. In the example of FIG. 9B, the first inclination is an inclination that decreases to the right from the upper left to the lower right, and the second inclination is an inclination that increases to the right from the lower left to the upper right, which are orthogonal to each other. do. However, the first inclination and the second inclination need only have a constant inclination in the left-right direction, and do not necessarily have to be orthogonal to each other.

In the present embodiment, the end face of the upper end of the conductive layer 130 can form a plane parallel to the diagonal direction along two sides orthogonal to each other, and the distribution of the magnetic field of the conductive layer 130 is different from that of the first embodiment. be able to. Further, by forming the upper end of the booster sheet 110 including the base material 120 into the same shape as the upper end of the conductive layer 130, the booster sheet for opening and closing the door glass 21 up and down for the same reason as in the tenth embodiment. The frictional resistance that 110 receives from the rubber 24 of the door trim 23 can be reduced.

12. The twelfth embodiment FIG. 9C is an enlarged view of the vicinity of the booster seat 111 of the twelfth embodiment. The booster sheet 111 has the contour shape of the convex curved portion 143 in which the upper end of the conductive layer 130 has a constant curvature in the left-right direction in the above-mentioned plan view, which is the same as that of the booster sheet 109 of the tenth embodiment. Is different. In this example, the convex curved portion 143 has a substantially arc shape, but the present invention is not limited to this, and an irregular curved line or a combination of curved lines and straight lines may be formed.

In the conductive layer 130 of the booster sheet 111, the highest position at the upper end is the top portion 143a at the substantially center in the left-right direction, and the lowest position at the upper end is the bottom portions 143b and 143c at the left end and the right end. The top portion 143a and the bottom portions 143b and 143c have a smooth substantially arcuate contour shape. Due to this shape of the conductive layer 130 of the booster sheet 111, the magnetic field of the conductive layer 130 is compared with the case where the end faces are along two straight sides that are orthogonal to each other or two straight sides that are not orthogonal to each other. It can be assumed that the distribution of is smoothly changed. Further, as described above, the frictional resistance received by the booster seat 111 from the rubber 24 of the door trim 23 when the door glass 21 is opened and closed up and down can be reduced.

13. 13th Embodiment Although it is similar to the 12th embodiment, FIG. 9D is an enlarged view of the vicinity of the booster seat 112 of the 13th embodiment. The booster sheet 112 is different from the booster sheet 111 in that the upper end of the conductive layer 130 has the contour shape of the concave curved portion 144 having a constant curvature in the left-right direction in the above-mentioned plan view. In this example, the concave curved portion 144 has a substantially arc shape, but as described above, the concave curved portion 144 is not limited to this.

The highest position of the upper end of the booster sheet 112 is the left and right tops 144a and 144b in the left-right direction, and the lowest position of the upper end is the bottom 144c at the substantially center. The present embodiment can also obtain the same operation as the booster seat 111 of the twelfth embodiment.

14. 14th Embodiment Next, the booster seat of the 14th embodiment of the present disclosure will be described. FIG. 10 is an enlarged view of the vicinity of the booster seat 113 of the 14th embodiment. The booster seat 113 includes an antenna substrate 162 and a relay antenna 161 supported by the antenna substrate 162 on the lower side in the above-mentioned plan view. Further, the booster sheet 113 is provided with a substantially rectangular conductive layer 130 supported by a base material or the like on the upper side thereof, and is electrically connected to the connection terminals 163a and 163b at both ends of the relay antenna 161. The conductive layer 130 is composed of a flat plate portion 164 extending in a plane.

The relay antenna 161 is a loop antenna and may be formed by winding with a coated conductor wire, or a metal layer such as an aluminum foil is attached on the antenna substrate 162 via an adhesive, and this is predetermined by an etching process. It may be formed so as to leave a metal layer in the shape of an antenna. In the latter case, it is necessary to provide bridge wiring with an insulating layer sandwiched between them so that one of the antenna wirings straddles the other.

As shown in FIG. 10, when the door glass 21 of the booster sheet 113 having such a configuration is closed, the opening area of the coil of the antenna 52 of the reader / writer 5 and the opening area of the coil of the relay antenna 161 of the booster sheet 113 Arrange so that they overlap with each other. By doing so, the antenna 52 and the relay antenna 161 are in a relationship of a primary coil and a secondary coil, and the antenna 52 and the relay antenna 161 are coupled to each other by electromagnetic induction. On the other hand, the current due to the electromotive force generated in the relay antenna 161 flows into the conductive layer 130 via the connection terminals 163a and 163b, and an eddy current is generated in the conductive layer 130.

When the booster seat 113 has the above-mentioned configuration, the relay antenna 161 which is a loop antenna as a secondary antenna on the lower side of the conductive layer 130 electromagnetically couples with the antenna 52 while reducing the loss. Further, a concentrated eddy current can be generated only in the conductive layer 130 which is the flat plate portion 164 arranged on the upper side of the booster sheet 113, and a strong magnetic field can be efficiently generated from the vicinity of the end face thereof.

Further, the relay antenna 161 and the portion of the antenna substrate 162 that supports the relay antenna 161 that are difficult to reduce in thickness are arranged below the rubber 24 of the door trim 23 when the door glass 21 is closed. It is preferable to provide it in. By doing so, it is possible to prevent the relay antenna 161 and the portion of the antenna substrate 162 that supports the relay antenna 161 from rubbing against the rubber 24 in the opening / closing operation of the door glass 21 to cause deterioration or damage.

The configuration and operation of the booster seats described in the first to fourteenth embodiments can be applied to a partial combination thereof, which is also within the scope of the present disclosure. Further, it is needless to say that the configuration of the wireless communication system of the first embodiment and its operation can be applied to a configuration in which the booster seat described in the second to fourteenth embodiments is replaced with the booster seat according to the above partial combination. .. Further, although the booster seat according to each embodiment has been described as being provided on the door glass 21 of the front door 2, the booster seat of the present disclosure may be provided on the door glass 31 of the rear door 3.

1 Vehicle 2 Front door 3 Rear door 4 Electronic control device 5 Reader / writer 6 Door lock drive unit 7 Engine drive unit 10 Communication terminal 11 Terminal antenna 12 Control unit 21, 31 Door glass 22 Door handle 23 Door trim 24 Rubber 41 Control unit 42 Authentication unit 51 Communication circuit 52 Antenna 53 Board 54 IC chip 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113 Booster sheet 120 Base material 121 Adhesive 130 Conductive Layer 130a First conductive layer 130b Second conductive layer 131 Flat plate portion 131a, 131c First flat plate portion 131b, 131d Second flat plate portion 132, 132a, 132b, 132c, 132d Protruding portion 133, 134, 135, 136 Opening 136a Passage 137 Gap 138 138a, 138b, 138c Magnetic sheet 139 139a, 139b Notch 141 Inclined portion 142 Comb-shaped portion 143 Convex curved portion 144 Concave curved portion 141a, 142a, 143a, 144a, 144b Top 141b, 142b, 143b, 143c , 144c Bottom 142s First side 142t Second side 151, 152 Comb-shaped part 151a, 152a, 153a, 154a Convex part 151b, 152b, 153b, 154b Recessed part 153, 155 First comb-shaped part 154, 156 Second comb-shaped part 161 Relay antenna 162 Antenna board 163a, 163b Connection terminal 164 Flat plate 200 Conductor plate 300 Wireless communication system

Claims (14)

By relaying communication electromagnetic waves transmitted and received between the in-vehicle communication device provided in the vehicle and the communication terminal outside the vehicle, short-range wireless communication between the in-vehicle communication device and the communication terminal can be performed. A possible booster sheet with a conductive layer,
It is provided on either the front or back surface of the non-conductive plate-shaped portion of the vehicle.
A flat plate portion that is a part of the conductive layer and extends in a plane,
It overlaps with at least a part of the opening region of the coil of the antenna for transmitting and receiving communication electromagnetic waves included in the in-vehicle communication device in a plan view of the non-conductive plate-shaped portion along the normal of any of the surfaces. With openings that are not conductive layers,
A conductive layer which is another part of the conductive layer and includes a pair of protrusions extending from the flat plate portion so as to surround the opening and facing each other at a distance from each other. Booster seat to prepare. The non-conductive plate-shaped portion is a movable door glass.
The first aspect of the present invention, wherein the opening overlaps with at least a part of the opening region of the coil of the antenna for transmitting and receiving the communication electromagnetic wave included in the in-vehicle communication device in the plan view when the door glass is closed. Booster seat. When the opening is the first opening and the pair of protrusions is the first protrusion,
A second opening different from the first opening,
The booster sheet according to claim 1 or 2, comprising a second protrusion extending from the flat plate portion so as to surround the second opening. The booster seat according to claim 3, wherein the second protrusion is a pair of protrusions that are separated from each other and face each other. By relaying communication electromagnetic waves transmitted and received between the in-vehicle communication device provided in the vehicle and the communication terminal outside the vehicle, short-range wireless communication between the in-vehicle communication device and the communication terminal can be performed. A possible booster sheet with a conductive layer,
It is provided on either the front or back surface of the non-conductive plate-shaped portion of the vehicle.
The conductive layer is separated and arranged in a first conductive layer and a second conductive layer which are separated from each other by a slit-shaped gap and face each other.
Each of the first conductive layer and the second conductive layer includes a flat plate portion that is a part thereof and extends in a plane, and is a method of any one of the surfaces of the non-conductive plate-shaped portion. A booster sheet provided with a conductive layer, characterized in that it overlaps with at least a part of an opening region of an antenna coil for transmitting and receiving communication electromagnetic waves included in the in-vehicle communication device in a plan view along a line. The non-conductive plate-shaped portion is a movable door glass.
Each of the first conductive layer and the second conductive layer is at least the opening region of the coil of the antenna for transmitting and receiving the communication electromagnetic wave included in the in-vehicle communication device in the plan view when the door glass is closed. The booster sheet according to claim 5, which overlaps a part. The booster sheet according to any one of claims 1 to 6, wherein the conductive layer has end faces along two sides orthogonal to each other. One of claims 1 to 7, wherein in the plan view, the conductive layer further extends from the flat plate portion and includes a comb-shaped portion having a contour shape formed by repeated irregularities along a predetermined direction. Booster seats described in section. The booster sheet according to any one of claims 1 to 8, wherein the conductive layer has a contour shape that is not axisymmetric in the plan view. The booster sheet according to any one of claims 1 to 9, wherein in the plan view, the conductive layer has a linear or curved contour shape in which the upper end has a constant inclination with respect to the left-right direction. The comb-shaped portion has a first side whose upper end has a first inclination with respect to the left-right direction in the plan view.
A second side having a second slope different from the first slope,
The eighth aspect of the present invention, wherein the first side and the second side are repeatedly arranged to have a top of a convex portion formed by the first side and the second side. Booster seat. Further provided with a magnetic sheet that at least partially overlaps the conductive layer in the plan view.
The booster sheet according to any one of claims 1 to 11, wherein the magnetic material sheet is laminated on the inner surface side of the vehicle of the booster sheet. The booster seat according to any one of claims 1 to 12, and the booster sheet.
The in-vehicle communication device provided with a first antenna for short-range wireless communication, and
A wireless communication system including the communication terminal provided with a second antenna for short-range wireless communication.
When a vortex current is generated in the conductive layer of the booster sheet from the magnetic flux generated from the first antenna or the second antenna and the second antenna is brought close to the end face of the conductive layer, the first antenna is generated. A wireless communication system in which an antenna and the second antenna are indirectly coupled by electromagnetic induction, and the in-vehicle communication device and the communication terminal can perform short-range wireless communication. Further equipped with an electronic control device provided in the vehicle,
The electronic control device compares and collates the first ID code received by the in-vehicle communication device from the communication terminal with the second ID code unique to the vehicle registered by itself.
When the first ID code and the second ID code match, the door lock of the vehicle is released.
The wireless communication system according to claim 13, wherein the door lock of the vehicle is not released when the first ID code and the second ID code do not match.

Images