JP2004308231A - Key device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key device for a vehicle facilitating the attaching work of an immobilization coil and its peripheral part in the key device for the vehicle and, at the same time, also preventing the damage in a conductor of the coil in the case it is attached and after it has been attached to make sure that the conductor of the coil has an electrical insulation. <P>SOLUTION: The key device for the vehicle includes the coil 4 receiving a signal from a transponder provided to a key, a ferrite member 5 placed on the back side of the coil 4, a substrate 6 placed on the back side of the ferrite member 5 and connecting the end section of the conductor 7 pulled out from the coil 4 thereto and an insulating double faced adhesive sheet 8 placed between the coil 4 and the ferrite member 5 and fixing them to each other, and the double faced adhesive sheet 8 is equipped with a protection section 8b formed so as to project from the circumferential edge of the ferrite member 5 in a position where the conductor 7 of the coil 4 is at least pulled out. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle key device having a structure suitably used for an immobilizer for preventing a vehicle such as an automobile from being stolen.
[0002]
[Prior art]
A transponder is provided on a key for starting a motor of a vehicle equipped with a motor such as an automobile, and a coil for electromagnetic coupling by electromagnetic induction is provided on a key cylinder portion of the vehicle body into which the key is inserted, and the key is inserted into the key cylinder. When the identification information is collated by transmitting and receiving an electromagnetic signal subjected to a predetermined signal modulation between the coil on the vehicle body side and the transponder provided on the key when the identification information matches, There is known a vehicle key device having an immobilizer function that is configured to start a prime mover only in a vehicle. As a technique relating to a vehicle key device having such an immobilizer function, for example, Patent Document 1 discloses the following configuration.
[0003]
That is, this conventional vehicle key device includes a coil for an immobilizer, a soft ferrite member, and a cylindrical case that covers the coil and the soft ferrite member on the key insertion hole side of the key cylinder. Here, the soft ferrite member is formed coaxially with the key cylinder so as to extend along the outer peripheral portion of the key insertion hole of the key cylinder, and has an annular shape at an intermediate portion in the circumferential direction of the front surface facing the outside of the key cylinder. A groove is provided, and a linear groove is formed on the front side. The coil is an air-core coil that is coaxial with the key cylinder and is accommodated in the annular groove of the soft ferrite member. Is pulled out to the outer peripheral side. The conductor of the coil drawn out to the outer peripheral side of the soft ferrite member is connected to the immobilizer unit.
[0004]
[Patent Document 1]
JP-A-2002-309814 (page 5, FIG. 10)
[0005]
[Problems to be solved by the invention]
Here, the conductive wire constituting the coil has a low strength just by applying an insulating coating to a conductive wire having a small wire diameter. Therefore, at the time of assembling the coil, or after the assembling, the conductor drawn out of the coil comes into contact with the edge of the soft ferrite member and other peripheral components, so that the insulating film of the conductor is peeled off and becomes electrically conductive, or The conductor itself could be cut. Therefore, when assembling the coil, the worker is required to have a high level of skill to prevent damage to the conductor, and even after the coil is assembled, the conductor comes into contact with peripheral components such as edges of the soft ferrite member. A configuration was required to prevent damage.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and aims at facilitating an assembling operation of a coil for an immobilizer and a peripheral portion thereof in a vehicle key device, and at the same time, preventing damage to a lead wire of the coil during and after assembling. It is an object of the present invention to prevent the occurrence of electric current and to ensure electrical insulation of the conductor of the coil.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a key device for a vehicle according to the present invention, wherein a coil for receiving a signal from a transponder provided on the key is provided, and the coil is disposed on a rear side of the coil. A ferrite member, a substrate disposed on the back side of the ferrite member to which an end of a lead wire drawn from the coil is connected, and an insulating member disposed between the coil and the ferrite member to fix them together. A double-sided pressure-sensitive adhesive sheet, wherein the double-sided pressure-sensitive adhesive sheet has a protective portion formed so as to protrude from a peripheral edge of the ferrite member at least at a position where the conductor of the coil is drawn out.
[0008]
Thereby, the coil and the ferrite member can be easily fixed, and the insulation between them can be ensured. In addition, the conductor drawn out of the coil only needs to connect its end to the board, and the distance of the conductor can be shortened, so that it is easy to handle the conductor during assembly work of the coil and prevent its damage. Can be.
[0009]
Further, the conductor drawn out of the coil is protected by the protection portion of the double-sided pressure-sensitive adhesive sheet formed so as to protrude from the peripheral edge of the ferrite member so as not to directly contact particularly the edge portion of the ferrite member. Therefore, it is possible to prevent the conductive wire from being damaged both during and after assembling the coil. Therefore, electrical insulation of the coil and its conductor can be ensured.
[0010]
According to a second feature of the vehicle key device according to the present invention, in the configuration according to the first feature, the protection portion of the double-sided pressure-sensitive adhesive sheet is configured such that the protective portion of the double-sided pressure-sensitive adhesive sheet has It consists of a tongue piece extending in the lead-out direction of the conductor.
[0011]
Thereby, in addition to the operation and effect of the characteristic configuration according to the first aspect, at the position where the conductive wire is drawn out from the coil, the protection portion can be configured to cover particularly the edge portion of the ferrite member. The conductor drawn out of the coil can be reliably protected and its damage can be prevented.
[0012]
According to a third aspect of the vehicle key device according to the present invention, in the configuration according to the first or second aspect, the protection portion of the double-sided pressure-sensitive adhesive sheet has adhesiveness and is pulled out from the coil. The conductive wire is adhered and fixed to one or both of the ferrite member and the substrate via the protection portion.
[0013]
Thereby, in addition to the effect of the characteristic configuration according to claim 1 or 2, the protective portion of the double-sided pressure-sensitive adhesive sheet is attached to one or both of the ferrite and the substrate and pulled out from the coil. The conductor can be fixed to the vicinity of the land to which the end of the conductor of the substrate is connected only by sticking the conductor to the protection part of the double-sided pressure-sensitive adhesive sheet. Therefore, the work of soldering the end of the conductor can be facilitated, and the conductor can be prevented from moving and coming into contact with the surrounding components, especially the edges of the ferrite member, so that the coil can be further improved. This facilitates the assembling work and ensures the protection of the coil conductor.
[0014]
According to a fourth feature of the vehicle key device according to the present invention, in the configuration according to any one of the first to third features, the ferrite member is arranged coaxially with the coil, and In that it has a larger outer diameter.
[0015]
Thereby, in addition to the effect of the characteristic configuration according to any one of claims 1 to 3, the spread of the magnetic field from the coil toward the transponder, that is, toward the front side of the coil is increased. And the sensitivity of the coil can be increased. The configuration of the present invention is particularly suitable for a case in which the ferrite edge exists in a direction in which a conductor is drawn from the coil because the ferrite member has an outer diameter larger than the coil. .
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a vehicle key device according to the present invention will be described below with reference to the drawings. In this embodiment, a key device for starting and stopping an engine of an automobile is provided around a front side (key insertion hole 3a side) of a key cylinder 3 into which a key 2 provided with a transponder 1 is inserted. A description will be given of a vehicular key device which is provided with a coil 4, a ferrite member 5, and a substrate 6, and in which the coil 4 functions as an antenna of an immobilizer system. FIG. 1 is an exploded perspective view for explaining the configuration of the vehicle key device according to the embodiment, and FIG. 2 is a perspective view showing a completed state of the vehicle key device according to the embodiment. FIG. 3 is a perspective view showing a state in which the coil 4, the ferrite member 5, and the substrate 6 of the vehicle key device according to the present embodiment are assembled together.
[0017]
As shown in these figures, the key device for a vehicle according to the present embodiment includes a key cylinder 3 that allows a rotation operation around the axis A in a state where a physically compatible key 2 is inserted, A coil 4 for receiving a signal from the transponder 1 provided; a ferrite member 5 disposed on the back side of the coil 4; and an end of a conducting wire 7 disposed on the back side of the ferrite member 5 and drawn out of the coil 4. And an insulating double-sided adhesive sheet 8 disposed between the coil 4 and the ferrite member 5 to fix them together, and to cover the periphery of the coil 4, the ferrite member 5, and the substrate 6. And a cover 9. In the description of the present embodiment, “front” refers to a surface facing the transponder 1, and “back” refers to a surface opposite to the front.
[0018]
As shown in FIG. 2, the key 2 has a metal insertion portion 2a inserted into the key cylinder 3, and a synthetic resin base 2b provided at the rear end of the insertion portion 2a. The transponder 1 is provided inside the base 2b. The transponder 1 is a device that outputs a specific identification signal in response to a request signal that is an electromagnetic signal transmitted from the coil 4. The identification signal includes identification information for identifying whether the key 2 is suitable for the vehicle. As the configuration of the transponder 1, various known configurations having a function of outputting an identification signal including preset identification information in response to a request signal that is an electromagnetic signal transmitted from the coil 4 can be used. It is. Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-93649, the transponder 1 includes a coil for electromagnetic coupling and a capacitor connected in parallel with the coil, and responds to a signal of a predetermined frequency to cause resonance. Or a transponder 1 in addition to a resonance circuit having a coil for electromagnetic coupling and a capacitor connected in parallel with the coil for electromagnetic coupling, as shown in Japanese Patent Application Laid-Open No. 9-170366. A configuration in which a current induced by electromagnetic coupling of a coil for electromagnetic coupling is rectified by a rectifier circuit and supplied to a control circuit and a storage device such as an EEPROM for storing specific identification information, and an identification signal including the identification information is output. It can be.
[0019]
The key cylinder 3 has a mechanism that allows a rotation operation around the axis A when a physically compatible key 2 is inserted, and physically restricts the rotation operation when an incompatible key 2 is inserted. This is a cylindrical device having a key insertion hole 3a for inserting the key 2 along the axis A. When the physically compatible key 2 is inserted into the key insertion hole 3a, as shown in FIG. 2, the L position (lock position), the Acc position (accessory position), the ON position (ON position), The rotation operation can be freely performed at each of the ST positions (start positions). Therefore, characters indicating the respective operation positions are printed on the cover 9.
[0020]
The coil 4 is formed by winding a polyester wire (PEW) formed by coating a copper wire with a polyester resin, a polyurethane wire (UEW) formed by coating a copper wire with a polyurethane resin, or the like in an air-core annular shape. It is formed by retaining the shape of resin or the like. The conductors 7 at the start and end of the coil 4 are drawn out to the outer periphery of the annular coil 4 for connection to the substrate 6. The coil 4 is arranged around the key insertion hole 3 a on the front side of the key cylinder 3. The coil 4 transmits a request signal, which is an electromagnetic signal for requesting the transponder 1 for an identification signal, and receives the identification signal output from the transponder 1 in response to the request signal. (See FIG. 7). The configuration of the coil 4 is not limited to that shown in this embodiment. For example, the coil 4 is formed in an annular shape by winding the conductor 7 around a bobbin (not shown) without using an air core. It is also possible to use things and the like. However, in this case, in order to prevent the conductive wire 7 from being damaged by contact with the bobbin edge or the like, use a bobbin having a shape such that no edge exists on the path from which the conductive wire 7 of the coil 4 is drawn. Is desirable.
[0021]
Here, the ferrite member 5 is formed in an annular shape having an outer diameter larger than the coil 4 and an inner diameter substantially equal to or slightly smaller than the coil 4. As a material of the ferrite member 5, it is preferable to use a soft ferrite exhibiting soft magnetism. The ferrite member 5 is disposed on the back side of the coil 4 and is coaxial with the coil 4. Here, the coil 4 and the ferrite member 5 are fixed using a double-sided pressure-sensitive adhesive sheet 8 described later. As a result, the ferrite member 5 is disposed so as to cover the entire back surface of the annular coil 4, and the magnetic field generated from the coil 4 is directed to the opposite side of the ferrite member 5, that is, to the front side of the coil 4. Since it is possible to project the signal, the sensitivity at the time of transmitting and receiving a signal to and from the transponder 1 can be increased. Note that hard ferrite can be used as the material of the ferrite member 5.
[0022]
The substrate 6 is formed by forming a predetermined wiring pattern on an insulating material such as glass epoxy by a printed wiring technique, and its outer shape is larger than the outer shape of the ferrite member 5. The ferrite member 5 is formed in a shape provided with a circular hole 6a having a diameter smaller than the inner diameter. More specifically, in the present embodiment, the outer shape of the substrate 6 is substantially the same as the cross-sectional shape of the key cylinder 3 perpendicular to the axis A. The substrate 6 is disposed on the rear side of the ferrite member 5 so that the center circular hole 6 a is coaxial with the coil 4 and the ferrite member 5. Here, the substrate 6 and the ferrite member 5 are fixed using an adhesive. It should be noted that a double-sided pressure-sensitive adhesive sheet may be employed for these fixing.
[0023]
A land 6b for connecting an end of a conductive wire 7 drawn from the coil 4 is provided outside the outer peripheral edge of the ferrite member 5 in front of the substrate 6, and a ferrite member 5 is provided on the front side of the substrate 6. In a state where the coil 5 is fixed and the coil 4 is fixed to the front side of the ferrite member 5 via the double-sided adhesive sheet 8, the end of the conductive wire 7 is connected to the land 6b by soldering. Various chips such as resistors and capacitors are fixed to the front or rear surface of the substrate 6 by soldering in addition to the lands 6b. A cord 11 connected to the immobilizer unit 10 (see FIG. 7) is fixed to the rear surface of the substrate 6 by soldering, and is disposed along the key cylinder 3.
[0024]
The double-sided pressure-sensitive adhesive sheet 8 is a sheet-shaped member that is disposed between the coil 4 and the ferrite member 5 and has a pressure-sensitive adhesive surface on both sides to fix them together. In the present embodiment, as shown in FIG. 4, the double-sided pressure-sensitive adhesive sheet 8 has a planar shape in which a tongue-shaped protective portion 8b is formed by protruding from a part of an annular main body 8a. As shown in FIG. 5, which is a cross-sectional view taken along line XX of FIG. 4, an adhesive portion 8d is provided on both sides of the sheet portion 8c having such a planar shape. Before the assembly, a release paper 12 is attached so as to cover the surface of the adhesive portion 8d in order to protect the adhesive portion 8d. The material forming the sheet portion 8c of the double-sided pressure-sensitive adhesive sheet 8 is an insulating material, and specifically, polyethylene terephthalate, polyester, or the like is suitably used. The material of the adhesive portion 8d of the double-sided adhesive sheet 8 is a material that has little change over time and can obtain a strong adhesive force, and for example, an acrylic adhesive is suitably used. The material constituting the double-sided pressure-sensitive adhesive sheet 8 is not limited to these, and is a material capable of adhering and fixing the coil 4 and the ferrite member 5 and ensuring insulation between them. If it is, it can be used.
[0025]
In the present embodiment, the shape of the double-sided pressure-sensitive adhesive sheet 8 is such that the shape of the main body 8 a is substantially the same as the shape of the front surface of the ferrite member 5, that is, the outer diameter and the diameter are substantially the same as those of the ferrite member 5. It is formed in an annular shape having an inner diameter. Therefore, the double-sided pressure-sensitive adhesive sheet 8 is attached coaxially with the ferrite member 5 so as to entirely cover the front surface of the ferrite member 5. Then, the coil 4 is attached to the front surface of the double-sided pressure-sensitive adhesive sheet 8 so as to be coaxial with the ferrite member 5, and the ferrite member 5 and the coil 4 are fixed. As described above, since the shape of the main body 8a of the double-sided pressure-sensitive adhesive sheet 8 is an annular shape substantially the same as the shape of the front surface of the ferrite member 5, when the double-sided pressure-sensitive adhesive sheet 8 is adhered to the front surface of the ferrite member 5, It is only necessary to attach the main body 8a of the double-sided pressure-sensitive adhesive sheet 8 so as to conform to the shape of the front surface of the ferrite member 5, so that the attaching operation can be facilitated. The shape of the main body 8a of the double-sided pressure-sensitive adhesive sheet 8 is not limited to this, but may be any shape that is suitable for fixing the coil 4 to the front of the ferrite member 5. Therefore, for example, it is also possible to have an annular shape substantially the same as the shape of the back surface of the coil 4.
[0026]
Further, the double-sided pressure-sensitive adhesive sheet 8 is provided with a protective portion 8b formed so as to protrude from the outer peripheral edge of the ferrite member 5 at least at a position where the conductive wire 7 of the coil 4 is drawn out. As described above, the protection portion 8b is formed so as to protrude from the outer peripheral edge of the ferrite member 5 at a position where the conductive wire 7 of the coil 4 is drawn out, so that the conductive wire 7 of the coil 4 is particularly formed on the outer periphery of the ferrite member 5. It serves to protect the conductor 7 by entering between the conductor 7 and the ferrite member 5 so as not to come into direct contact with the portion 5a. In the present embodiment, the protection portion 8b of the double-sided pressure-sensitive adhesive sheet 8 is constituted by a tongue piece extending from the outer peripheral edge of the main body 8a of the double-sided pressure-sensitive adhesive sheet 8 in the direction in which the conductive wire 7 of the coil 4 is drawn out. More specifically, the protection portion 8b is formed in a band shape having a constant width protruding from the outer peripheral edge of the main body portion 8a of the double-sided pressure-sensitive adhesive sheet 8. The width of the band-shaped protection portion 8b, which is a tongue piece, is such that the conductor 7 of the coil 4 drawn in the outer peripheral direction on the front side of the protection portion 8b is displaced in the width direction of the protection portion 8b. It is preferable to form them so as to have a sufficient width so as not to deviate from the protection range (width of the protection portion 8b).
[0027]
Further, it is preferable that the protective portion 8b of the double-sided pressure-sensitive adhesive sheet 8 has a configuration in which both surfaces have adhesiveness. The length of the protective portion 8b of the double-sided adhesive sheet 8 protruding in the outer peripheral direction is set to such a length that a part of the front end side is in contact with the surface of the substrate 6 disposed on the back side of the ferrite member 5. It is suitable. Thereby, the conducting wire 7 drawn out of the coil 4 can be adhesively fixed to the ferrite member 5 and the substrate 6 via the protection portion 8b. That is, as shown in FIGS. 3 and 6, the protective portion 8 b is attached from the edge portion 5 a of the ferrite member 5 to the side surface (outer peripheral surface) and the front surface of the substrate 6, and the conductor 7 is attached to the surface of the protective portion 8 b. By sticking, the conductive wire 7 can be easily and adhesively fixed to the ferrite member 5 and the substrate 6. Thus, insulation and protection of the conductor 7 of the coil 4 with respect to the ferrite member 5 and fixing of the conductor 7 on the substrate 6 can be performed simultaneously. Therefore, it is possible to simultaneously prevent both the occurrence of a failure or a defective product and to facilitate the assembly. Note that the length of the protection portion 8 b protruding in the outer peripheral direction may be a length that protrudes from the outer peripheral edge of the ferrite member 5 but does not contact the substrate 6. In this case, the protection portion 8b is adhered to the edge portion 5a of the ferrite member 5 and the side surface thereof, and the conductor 7 drawn out of the coil 4 is adhesively fixed only to the ferrite member 5.
[0028]
In this embodiment, in order to simplify the work of assembling the double-sided pressure-sensitive adhesive sheet 8, the coil 4, the ferrite member 5, and the like, the protection portion 8b and the main body 8a are provided integrally. However, the protection portion 8b may be provided separately from the main body 8a of the double-sided pressure-sensitive adhesive sheet 8, and the protection portion 8b and the main body 8a may be integrated by, for example, being adhesively fixed.
[0029]
The cord 11 extending from the board 6 is connected to the immobilizer unit 10 to constitute an immobilizer system as shown in FIG. FIG. 7 is a schematic diagram illustrating a configuration of the immobilizer system according to the present embodiment. The immobilizer unit 10 includes a transmitting unit 10a having a transmitting circuit and a driving circuit for transmitting and outputting a request signal, which is an electromagnetic signal, via the coil 4 functioning as an antenna, and an identification signal from the transponder 1 via the coil 4. And a determination unit 10c for determining whether or not the identification information included in the identification signal received by the reception unit 10b is appropriate. Here, although not shown, the determination unit 10c includes a storage device such as an EEPROM storing matching identification information, and identification information included in an identification signal received based on the identification information stored in the storage device. And a processing device provided with logic, software, and the like for performing the conformity determination processing.
[0030]
When the immobilizer unit 10 detects that the key 2 has been inserted into the key cylinder 3 by a sensor or the like provided in the key cylinder 3, the immobilizer unit 10 operates the transmitting unit 10 a to request the electromagnetic signal via the coil 4. A signal is transmitted to transponder 1 of key 2. In the transponder 1, an identification signal including preset identification information is output to the coil 4 in response to a request signal from the coil 4. This identification signal is received by the receiving unit 10b via the coil 4 and sent to the determining unit 10c. Then, in the determination unit 10c, a matching determination process of the identification information included in the identification signal is performed. As a result, when it is determined that the identification information included in the identification signal received from the transponder 1 of the key 2 is appropriate, it is determined that an appropriate key 2 has been used, and the immobilizer unit 10 controls the engine. A predetermined adaptation signal is transmitted to the engine control module 13. Thus, the engine control module 13 outputs an operation control signal to the starter 14 for starting the engine and the ignition device 15 to operate the engine.
[0031]
As described above, in the present embodiment, as shown in FIG. Are formed in a planar shape protruding, but the form of the double-sided pressure-sensitive adhesive sheet 8 is not limited to that shown in this embodiment. Then, as another form of the double-sided pressure-sensitive adhesive sheet 8, there is, for example, one shown in FIG. 8 or FIG. The double-sided pressure-sensitive adhesive sheet 8 shown in FIG. 8 protrudes in a substantially sector shape by extending a part of the outer peripheral edge of the annular main body 8a having substantially the same shape as the front surface of the ferrite member 5 in the radial direction. This is one in which the protection portion 8b is formed. Further, the double-sided pressure-sensitive adhesive sheet 8 shown in FIG. 9 has a shape having an outer diameter larger than the outer periphery of the ferrite member 5 over the entire outer periphery of the ring-shaped main body portion 8a, and protrudes outward from the outer periphery of the ferrite member 5. A plurality of cuts 8e are formed in the radial direction of the ferrite member 5 so as to be bent so that the ferrite member 5 can be attached to the side surface and the front surface of the substrate 6 from the edge portion 5a. In this case, all portions protruding outward from the outer peripheral edge of the ferrite member 5 become protection portions 8b. The form of the double-sided pressure-sensitive adhesive sheet 8 described above is merely an example, and is disposed between the coil 4 and the ferrite member 5 to fix them together and to protect the conductive wire 7 drawn from the coil 4. Other shapes are also possible as long as they have the portion 8b.
[0032]
Further, in the present embodiment, the case where the protective portion 8b of the double-sided pressure-sensitive adhesive sheet 8 is formed so as to project from the outer peripheral edge of the ferrite member 5 has been described. It is not limited to the side, but it is also possible to project to the inner side. That is, when the conductive wire 7 is drawn out to the inner peripheral side of the coil 4 and is connected to the land 6b of the substrate 6 provided inside the inner peripheral edge of the ferrite member 5, the double-sided adhesive sheet 8 Is formed so as to protrude from the inner peripheral edge of the ferrite member 5 at least at a position where the conductive wire 7 of the coil 4 is drawn out. Thereby, the conductive wire 7 can be protected between the conductive wire 7 and the ferrite member 5 so that the conductive wire 7 of the coil 4 does not directly contact the inner periphery of the ferrite member 5, particularly, the edge portion.
[0033]
【The invention's effect】
As described above, according to the vehicle key device of the present invention, the coil that functions as the antenna of the immobilizer system and the ferrite member are fixed by the double-sided adhesive sheet, so that the assembling work of the coil peripheral portion is facilitated. In addition, it is possible to simultaneously insulate and protect the conductor of the coil from the ferrite member and fix the conductor to the substrate. Therefore, it is possible to ensure the electrical insulation of the coil conductors while preventing damage to the coil conductors during and after assembly, and to simultaneously achieve both the prevention of failure and defective products and the ease of assembly. it can.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view illustrating a configuration of a vehicular key device according to an embodiment.
FIG. 2 is a perspective view showing a completed state of the vehicle key device according to the embodiment.
FIG. 3 is an exploded perspective view showing a state in which the coil, the ferrite member, and the board of the vehicle key device according to the present embodiment are assembled together.
FIG. 4 is a plan view showing a double-sided pressure-sensitive adhesive sheet of the vehicle key device according to the embodiment.
FIG. 5 is a sectional view taken along line XX of FIG. 4;
FIG. 6 is a cross-sectional view of the vicinity of the protection portion of the double-sided pressure-sensitive adhesive sheet in a state where the coil, the ferrite member, and the substrate of the vehicle key device according to the present embodiment are assembled together.
FIG. 7 is a schematic diagram showing a configuration of an immobilizer system in the vehicle key device according to the embodiment.
FIG. 8 is a plan view showing another embodiment of the double-sided pressure-sensitive adhesive sheet of the vehicle key device according to the present invention.
FIG. 9 is a plan view showing still another embodiment of the double-sided pressure-sensitive adhesive sheet of the vehicle key device according to the present invention.
[Explanation of symbols]
1 Transponder
2 keys
3 key cylinder
4 coils
5 Ferrite material
6 substrate
7 conductor
8 Double-sided adhesive sheet
8a Body part of double-sided adhesive sheet
8b Protective part of double-sided PSA sheet
8c Sheet part of double-sided PSA sheet
8d Adhesive part of double-sided adhesive sheet
10 Immobilizer unit

Claims (4)

A coil for receiving a signal from a transponder provided on the key, a ferrite member disposed on the back side of the coil, and an end of a conductor drawn from the coil disposed on the back side of the ferrite member are connected. Substrate, comprising an insulating double-sided pressure-sensitive adhesive sheet disposed between the coil and the ferrite member and fixing them together,
The key device for a vehicle, wherein the double-sided pressure-sensitive adhesive sheet includes a protection portion formed so as to protrude from a peripheral edge of the ferrite member at least at a position where the conductive wire of the coil is drawn out. The vehicle key device according to claim 1, wherein the protection portion of the double-sided pressure-sensitive adhesive sheet is formed by a tongue extending from a peripheral edge of a main body of the double-sided pressure-sensitive adhesive sheet in a direction in which the coil leads are drawn out. The protective portion of the double-sided pressure-sensitive adhesive sheet has adhesiveness, and a lead wire drawn from the coil is adhesively fixed to one or both of the ferrite member and the substrate via the protective portion. Vehicle key device. The vehicle key device according to any one of claims 1 to 3, wherein the ferrite member is arranged coaxially with the coil and has an outer diameter larger than the coil.

Images