JP2004328120A - Antenna device with sensor, door handle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a antenna system equipped with sensor having an antenna part provided with a core part used in common for an antenna function and a static capacitance type sensor function and to provide a door knob unit. <P>SOLUTION: The antenna system equipped with sensor 1 is provided with the antenna part 2 comprising: the core part 5 provided with a conductive soft magnetic body 51; and a lead wire part 6 attached to the core part 5. At least part (e.g., a core sheet 50A) of the soft magnetic body 51 configures a static capacitance type sensor electrode capable of sensing an approach of an object. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an antenna device with a sensor and a door handle device.
[0002]
[Prior art]
Patent Literature 1 discloses a door handle having a bar antenna unit. According to this configuration, the antenna portion is built in the handle body of the door handle. When the user carrying the electronic key approaches the door handle, the reception state is set, and the bar code can receive the ID code from the electronic key.
[0003]
Patent Literature 2 discloses a door handle having a transmission antenna unit. According to this, the transmission antenna is built in the handle body of the door handle. This is transmitted from the transmission antenna unit.
[0004]
Further, Patent Documents 3 and 4 disclose a door opening and closing device in which a transmission antenna unit and a capacitance type sensor electrode are separately mounted on a door handle.
[0005]
[Patent Document 1] JP-A-2001-355358
[Patent Document 2] JP-A-2000-160897
[Patent Document 3] JP-A-2002-295064
[Patent Document 4] JP-A-2003-13628
[0006]
[Problems to be solved by the invention]
According to Patent Literature 3 and Patent Literature 4, a transmission antenna unit and a capacitance type sensor electrode are separately mounted on a door handle. It is formed of a member separate from the mold sensor electrode. Therefore, the antenna part only exhibits the antenna function, and the sensor electrode exhibits only the capacitance type sensor function.
[0007]
An object of the present invention is to provide a sensor-equipped antenna device and a door handle device having a core portion capable of sharing an antenna function and a capacitance-type sensor function by further technically advancing the conventional technology described above. And
[0008]
[Means for Solving the Problems]
An antenna device with a sensor according to the first aspect of the present invention is provided with an antenna unit including a core unit having a soft magnetic material having conductivity and a conductor unit attached to the core unit.
At least a part of the soft magnetic material is a capacitance type sensor electrode.
[0009]
According to the first aspect of the present invention, the antenna section has the core section and the conductor section attached to the core section, and can transmit and / or receive. Further, since at least a part of the soft magnetic material forming the core portion is a capacitance-type sensor electrode having conductivity, a change in capacitance occurs when an object approaches the sensor electrode. , The presence of the object is detected. That is, the soft magnetic material forming the core of the antenna unit is shared by the antenna function and the capacitance type sensor function.
[0010]
An antenna device with a sensor according to the second aspect of the present invention is provided with an antenna unit including a core unit including a soft magnetic material having conductivity and a conductive wire unit attached to the core unit.
At least a part of the soft magnetic material is a capacitance type sensor electrode,
The soft magnetic material is characterized by being constituted by laminating a plurality of core sheets.
[0011]
According to the second aspect of the present invention, the antenna section has the core section and the conducting wire section attached to the core section, and can transmit and / or receive. Further, since at least a part of the soft magnetic material forming the core portion is a capacitance-type sensor electrode having conductivity, a change in capacitance occurs when an object approaches the sensor electrode. , The presence of the object is detected. That is, the soft magnetic material forming the core of the antenna unit is shared by the antenna function and the capacitance type sensor function. In addition, since the soft magnetic material forming the core portion is formed by laminating a plurality of core sheets, even when an external force is applied, the deformability of the core sheet is ensured, and the protection of the core sheet is improved. Is improved.
[0012]
A door handle device according to a third aspect of the present invention is provided with an antenna portion including a core portion having a soft magnetic material having conductivity and a conductive wire portion attached to the core portion,
An antenna device with a sensor, wherein at least a part of the soft magnetic material is a capacitance type sensor electrode, is provided.
[0013]
According to the door handle device of the third aspect of the present invention, the antenna unit has the core unit and the conducting wire unit attached to the core unit, and can transmit and / or receive. Further, since at least a part of the soft magnetic material forming the core portion is a capacitance-type sensor electrode having conductivity, when an object approaches the sensor electrode of the door handle device, the capacitance becomes smaller. Changes, and the presence of the object is detected. That is, the soft magnetic material forming the core of the antenna unit is shared by the antenna function and the capacitance type sensor function.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, the antenna section includes the core section having the soft magnetic material having conductivity, and the conductor section attached to the core section. Examples of the soft magnetic material forming the soft magnetic material include a steel sheet, a silicon steel sheet, an amorphous soft magnetic material, and a soft magnetic nanocrystalline material having excellent magnetic permeability. Therefore, the core sheet can be formed of a steel sheet, a silicon steel sheet, an amorphous soft magnetic material, a soft magnetic nanocrystalline material, or the like. In particular, an amorphous soft magnetic material or a soft magnetic nanocrystalline material has high magnetic permeability and high frequency characteristics while having conductivity.
[0015]
Examples of the amorphous soft magnetic material include an iron-based material and a cobalt-based material. The soft magnetic nanocrystalline material includes at least one selected from iron, cobalt, and nickel, and at least one selected from titanium, zirconium, hafnium, vanadium, niobium, molybdenum, chromium, tungsten, tantalum, and manganese, Examples mainly include ultrafine crystal grains having a particle size of 2000 Å or less, 1000 Å or less, and 500 Å or less.
[0016]
In some cases, the soft magnetic material forming the core may be formed as a bulk body by consolidating soft magnetic powder.
[0017]
Note that a form in which the core portion is covered with a seal film can be exemplified. In this case, even when the core portion is easily corroded, the protection and durability of the core portion can be further improved.
[0018]
According to the present invention, the soft magnetic material forming the core portion can be exemplified by a configuration in which a plurality of core sheets are stacked with a deformable layer interposed between adjacent core sheets. In this case, since the soft magnetic material forming the core portion is formed with the deformable layer interposed between the adjacent core sheets, the deformation of the core sheet can be prevented even when an external force is applied. Property is secured, and the protection property of the core sheet is improved. Examples of the deformable layer include a soft material layer and an air layer. Examples of the soft material layer include a rubber-like member (rubber or soft resin). Examples of the soft material layer include a material having poor conductivity or non-conductivity.
[0019]
According to the present invention, it is possible to exemplify a mode in which an opposing member provided opposite to the soft magnetic material is provided between the soft magnetic material and the soft magnetic material so as to form an entry space into which the target can enter. Here, the soft magnetic body and the facing member may directly face each other via the entry space, or the soft magnetic body may be arranged in a state where another member is arranged between the soft magnetic body and the facing member. And the facing member may face each other.
[0020]
The facing member can be formed of a conductive material. It is preferable that the opposing member can be grounded (earthed). As the facing member, the base itself on which the antenna device with the sensor is mounted may be used. When applied to a structure such as a vehicle or a building, a body (including a door body) of a structure such as a car body or a building can be adopted as the base. The body of the vehicle body is generally grounded.
[0021]
Preferably, a control unit for transmitting or receiving an electric signal to or from the conductor of the antenna unit is provided, and the control unit transmits or receives the electric signal to or from the conductor of the antenna unit, and the sensor unit usage time, An example in which the sensor usage time for supplying power to the electrodes is set to be different from each other can be exemplified. This is advantageous for noise reduction. Shifting the antenna unit usage time from the sensor usage time means that the antenna unit usage time and the sensor usage time do not completely coincide with each other in time, and even if both partially overlap, both of them partially overlap. It only needs to be separated.
[0022]
The handle device is operated by a human body or a hand or the like of a robot. A representative handle device includes a door handle device (including a door handle and a door knob). Regardless of whether the handle is pulled, pushed, or rotated, the handle is not limited. When applied to the handle device, the facing member may be formed of a body of a structure such as a vehicle equipped with the handle device, or may be separately provided in addition to the body.
[0023]
【Example】
(First embodiment)
Hereinafter, a first embodiment of the present invention will be described. The sensor-equipped antenna device 1 according to the present embodiment has a transmitting antenna unit 2. As shown in FIG. 1, the antenna unit 2 has a core part 5 having magnetic permeability and a conductor part 6 attached to the core part 5.
[0024]
Further, the sensor-equipped antenna device 1 according to the present embodiment includes the facing member 3 provided to face the core 5 so as to form an entry space 4 into which the object 7 can enter between the core 5 and the entrance space 4. And The opposing member 3 is formed in a plate shape from a conductive material (for example, iron, cobalt, nickel, or aluminum). The facing member 3 faces the core portion 5 via the entry space 4 and is grounded (grounded) via the ground wire 30. The facing member 3 has a required area and is arranged along the core portion 5. The opposing member 3 may be formed of a base (a body such as a door body in the case of a vehicle) holding the antenna device with sensor 1.
[0025]
As shown in FIG. 1, the core portion 5 has good magnetic permeability and has conductivity. The core portion 5 is formed of a soft magnetic body 51 having a laminated structure formed by laminating a plurality of core sheets 50 having conductivity and high magnetic permeability at intervals in a thickness direction thereof. Although the thickness of the core sheet 50 per sheet is thin, the core sheets 50 are stacked to form a soft magnetic body 51 having a laminated structure, so that an apparent volume functioning as a magnetic core of the antenna unit 2 can be ensured. it can.
[0026]
Further, if the soft magnetic material 51 has a laminated structure in which the core sheets 50 are laminated, when an eddy current is generated in the core sheet 50, the eddy current loop can be reduced in the laminating direction of the core sheets 50, and the eddy current can be reduced. This is advantageous for reducing loss. Although the thickness of one core sheet 50 is appropriately selected, in consideration of the reduction of eddy current loss in a high frequency range, the thickness may be 1000 μm or less, particularly 500 μm or less, 100 μm or less, and 50 μm or less. Can be exemplified as 0.01 μm.
[0027]
In addition, the whole core part 5 or the surface of each core sheet 50 can be coated with a sealing film having a large electric resistance and a high sealing property as required. Thus, even when the use environment is severe, the durability of the entire core portion 5 or each core sheet 50 can be improved. In particular, it is useful for protecting the core portion 5 from foreign substances (water, iron powder, carbon content, etc.) from the outside and improving the durability of the capacitance sensor function.
[0028]
Examples of the material of the core sheet 50 include a soft magnetic material having a low coercive force. Examples of the soft magnetic material include an amorphous soft magnetic material and a soft magnetic nanocrystalline material. These materials are excellent in magnetic permeability and high-frequency characteristics while having conductivity, which is advantageous for high performance and miniaturization.
[0029]
Examples of the amorphous soft magnetic material include an iron-based material and a cobalt-based material. The soft magnetic nanocrystalline material includes at least one selected from iron, cobalt, and nickel, and at least one selected from titanium, zirconium, hafnium, vanadium, niobium, molybdenum, chromium, tungsten, tantalum, and manganese, An example is a fine particle having a particle size of 500 angstroms or less.
[0030]
According to the present embodiment, the entire core portion 5 or the surface of each core sheet 50 can be coated with a film having a large electric resistance as necessary. If a film having a large electric resistance is coated on the surface of each core sheet 50, generation of an eddy current loop in the thickness direction of the core sheet 50 is restricted, and eddy current loss can be reduced. As the film having a large electric resistance, an organic or inorganic film, for example, a phosphoric acid film or a ferrite iron oxide film can be used.
[0031]
According to this embodiment, the deformable layer 56 is interposed between the core sheets 50 constituting the soft magnetic body 51 having the laminated structure constituting the core portion 5. When the deformable layer 56 is interposed between the core sheets 50, the deformation tolerance and the protection of the core sheet 50 can be improved. As the deformable layer 56, a soft material layer or an air layer can be exemplified. Examples of the soft material layer include a rubber-like member (rubber or soft resin).
[0032]
The conducting wire portion 6 of the antenna portion 2 is attached to a soft magnetic body 51 having a laminated structure of the core portion 5. Specifically, as shown in FIG. 1, the conductive wire portion 6 includes a coil portion 60 wound a plurality of times in a coil shape around the outer surface of a soft magnetic body 51 having a laminated structure constituting the core portion 5, and a coil portion 60. And an extended portion 62 that is electrically connected to The coil unit 60 is wound around a core sheet 50A described later from the outside. A power supply 64 and a control unit 65 are connected to the extending portion 62 of the conducting wire portion 6. As the power supply 64, an AC power supply is preferable.
[0033]
As shown in FIG. 1, among a plurality of core sheets 50 constituting the soft magnetic body 51 having a laminated structure, a core sheet 50A facing the facing member 3 has conductivity in addition to soft magnetism, It can function as a capacitance-type sensor electrode, and is electrically connected to a detection unit 52 that detects capacitance. The detecting unit 52 has a function of applying a voltage between the core sheet 50A and the facing member 3 when detecting the capacitance, and detecting the capacitance of the core sheet 50A as a capacitance-type sensor electrode. Having. The detection unit 52 applies the principle of a capacitor to a capacitance-type sensor, and can measure a wide range of dielectrics such as a metal body and a human body.
[0034]
Since the core sheet 50A and the facing member 3 have a large area, it is advantageous for securing the capacitance. Note that the core sheet 50A and the facing member 3 may have the same area or may have different areas.
[0035]
When the target approaches the core sheet 50A, which is the sensor electrode, of the core 5, the target 7 enters the entry space 4 formed between the core sheet 50A of the core 5 and the facing member 3. The capacitance changes under the influence of the relative permittivity of the object 7, which is detected by the detection unit 52. Therefore, based on the change in the capacitance, the presence of the change target 7 or the quality of the target 7 is determined. Examples of the target 7 include living bodies such as humans and animals, working robots, objects such as parts and cards, and liquids such as rainwater.
[0036]
According to the present embodiment, the facing member 3 that is grounded via the ground wire 30 is provided near the core portion 5 and is formed between the core sheet 50A of the core portion 5 and the facing member 3. The space volume width of the entry space 4 is defined within a predetermined size. Since the target object 7 having a relative dielectric constant different from that of the entry space 4 is arranged in such an entry space 4, the volume of the object 7 occupying the entry space 4 is increased, so that a change in the dielectric constant is easily ensured. Therefore, the sensing performance as a capacitance type sensor is improved.
[0037]
The control unit 65 has a function of transmitting radio waves from the antenna unit 2.
[0038]
In use, since an alternating current is supplied from the power supply 64 to the conductor 6 of the antenna unit 2, an electromagnetic wave is formed by the generated electric field and magnetic field, and the electromagnetic wave is transmitted from the antenna unit 2. When an object 7 having an electronic key or the like approaches in a state where an electric wave is transmitted from the antenna unit 2, the electronic key or the like receives the electric wave. Further, since an unillustrated receiving device receives a radio wave transmitted from an electronic key or the like, the approach of the object 7 is detected. Then, based on a radio wave transmitted from an electronic key or the like, ID authentication (object authentication such as user authentication and component authentication) as to whether or not the object 7 is registered in advance can be performed.
[0039]
Furthermore, when the object 7 approaches the core sheet 50A of the core portion 5, that is, when the object 7 enters the entry space 4, the capacitance changes, and therefore the existence of the above-described object 7 or the object 7 Pass / fail is determined. Therefore, by effectively utilizing the soft magnetic body 51 having the conductivity and the soft magnetism of the core section 5 of the antenna section 2, a capacitance type sensor for detecting a human body or an object can be configured.
[0040]
For example, a case where the antenna device with sensor 1 according to the present embodiment is mounted on a door handle device will be described. In this case, since power is supplied from the power supply 64 to the conductor 6 of the antenna unit 2, radio waves are transmitted from the antenna unit 2. When a user equipped with an electronic key or the like approaches in a state where radio waves are transmitted from the antenna unit 2 as described above, the electronic keys or the like receive radio waves transmitted from the antenna unit 2. Further, since the receiving device receives the radio wave transmitted from the electronic key or the like, the approach of the user to the door handle device is detected, and the ID of the user is authenticated. ID authentication (user authentication) refers to determining whether a user is a registered person in advance.
[0041]
When a person registered by ID authentication is authenticated, the door can be opened and closed as follows. That is, when the user's fingertip approaches the core portion 5 to operate the door handle, that is, when the user's fingertip enters the entry space 4, the capacitance in the entry space 4 changes. The intention to open and close the door is detected. Therefore, the door device is unlocked by operating a door lock device (not shown). If the user is not authenticated as a registered person by ID authentication, the door device is kept locked even if the user's fingertip approaches the core unit 5 to operate the door handle. .
[0042]
As described above, when the conditions of ID authentication based on radio waves by the antenna unit 2 and detection of a user's intention to open the door based on a change in capacitance are satisfied, the door handle device is unlocked.
[0043]
According to the present embodiment, among the plurality of core sheets 50 constituting the soft magnetic body 51 having the laminated structure of the core section 5, the core sheet 50A facing the opposing member 3 is the detection section 52 for detecting the capacitance. However, the present invention is not limited to this, and a core sheet 50 other than the core sheet 50 </ b> A constituting the soft magnetic body 51 having a laminated structure may be electrically connected to the detection unit 52. In this case, another core sheet 50 electrically connected to the detection unit 52 becomes a sensor electrode.
[0044]
Further, according to the present embodiment, the facing member 3 grounded via the ground wire 30 is provided. However, the present invention is not limited to this, and the ground itself may be used instead of the facing member 3.
[0045]
(Second embodiment)
FIG. 2 shows a second embodiment. The second embodiment has basically the same configuration as the first embodiment. Parts that perform common functions are denoted by common reference numerals. Hereinafter, the different parts will be mainly described. The sensor-equipped antenna device 1 according to the present embodiment has an antenna unit 2 for reception. As shown in FIG. 2, the antenna section 2 has a core section 5 and a conductor section 6 attached to the core section 5. The conductor 6 of the antenna 2 is attached to a soft magnetic body 51 having a laminated structure of the core 5. Specifically, as shown in FIG. 2, the conductive wire portion 6 includes a coil portion 60 wound around the core portion 5 and an extending portion 62 electrically connected to the coil portion 60. The detection part 68 and the control part 65 are connected to the extension part 62 of the conductor part 6.
[0046]
In use, the antenna unit 2 receives an external radio wave. Therefore, when an object 7 (for example, a human body or an object) provided with an electronic key or the like that emits a radio wave approaches, the antenna unit 2 receives the radio wave and the approach of the object 7 is detected. Further, when the object 7 approaches the core sheet 50A of the core portion 5, that is, when the object 7 enters the entry space 4, the capacitance in the entry space 4 changes. The quality of the object 7 is determined.
[0047]
(Third embodiment)
FIG. 3 shows a third embodiment. The third embodiment has basically the same configuration as the first embodiment. Parts that perform common functions are denoted by common reference numerals. Hereinafter, the different parts will be mainly described. The sensor-equipped antenna device 1 according to the present embodiment includes an antenna unit 2 for both transmitting and receiving. As shown in FIG. 3, it has a core part 5 and a conductor part 6 attached to the core part 5. The conductor 6 of the antenna 2 is attached to the core 5. Specifically, as shown in FIG. 3, the conductive wire portion 6 has a coil portion 60 wound around the core portion 5 and an extension portion 62 electrically connected to the coil portion 60. A control section 65 is connected to the extension section 62, and a detection section 68 and a power supply 64 can be switched and connected by a switch 67. When the switch 67 conducts to the first contacts 68a and 68b, the conductor 6 is electrically connected to the power supply 64, so that the antenna 2 emits a radio wave. When the switch 67 conducts to the second contacts 69a and 69b, the conductor 6 is electrically connected to the detector 68, so that the antenna 2 can receive radio waves.
[0048]
(Control unit 65)
According to each of the above-described embodiments, as shown in FIG. 4, the control unit 65 controls the antenna unit use time TA for transmitting or receiving an electric signal to the conductor 6 of the antenna unit 2 and the opposing member 3 by electrostatic. The sensor use time TC used as a sensor is set to be shifted. That is, as shown in FIG. 4, the antenna unit use time TA for transmitting or receiving an electric signal to / from the conductor 6 of the antenna unit 2 and the sensor use time TC for supplying power to the opposing member 3 are temporally different. Performed at different times so that they do not overlap. Therefore, when the antenna section 2 is performing the antenna function, the capacitance type sensor is turned off. Conversely, when the antenna unit 2 functions as a capacitance-type sensor, the antenna function is turned off. This is advantageous for suppressing the generation of noise.
[0049]
The antenna use time TA for transmitting or receiving an electric signal to / from the conductor 6 of the antenna unit 2 and the sensor use time TC for using the facing member 3 as an electrostatic sensor may be completely separated. In some cases, as long as there are regions that do not overlap in time, they may partially overlap in time.
[0050]
(Application example)
5 and 6 show a first application example of each embodiment described above. This application example is a case where the invention is applied to a door handle device 100 that opens and closes a door mounted on a body of a vehicle. As shown in FIGS. 5 and 6, the door handle device 100 includes a base 101, a handle 102 provided on the base 101 so as to be rotatable in the directions of arrows B <b> 1 and B <b> 2, and operated with a fingertip of a user. In the closing direction (the direction of arrow B2). The biasing element 103 is formed by a torsion coil spring, but is not limited to this. The handle 102 forms an entry space 4 into which a fingertip enters.
[0051]
The above-described antenna unit 2 is provided on a portion 102a of the handle 102. In use, the antenna unit 2 transmits or receives radio waves for performing user ID authentication. The other member 102b of the handle 102 facing the member 102a via the entry space 4 is provided with the above-described facing member 3.
[0052]
An entry space 4 into which a fingertip can enter is formed between the antenna unit 2 and the facing member 3. Therefore, when the fingertip of the user as the target enters the entry space 4, the capacitance in the entry space 4 changes. For this reason, if the presence of the fingertip in the approach space 4 is determined by the change in the capacitance in the state where the ID is authenticated, the intention of the user to open the door is detected. Therefore, the door device is unlocked by operating a door lock device (not shown).
[0053]
As described above, when the conditions of ID authentication based on radio waves generated by transmission and / or reception of the antenna unit 2 and detection of a user's intention to open the door based on a change in capacitance are satisfied, the door handle device is unlocked. Is done.
[0054]
When the door body itself has conductivity, the provision of the facing member 3 at the portion 102b of the handle 102 may be omitted, and the facing member may be formed by the door body itself.
[0055]
7 to 9 show a second application example of each embodiment described above. This application example is a case where the present invention is applied to a door handle device 100 that opens and closes a door mounted on a body of a vehicle. The door handle device 100 has a handle 101 operated by a fingertip, and a mounting arm 102 for attaching the handle 101 to a door body of a vehicle. The handle 101 forms an entry space 4 into which the fingertip enters, between the handle 101 and the door body.
[0056]
As shown in FIGS. 7 to 9, the antenna unit 2 is disposed inside the handle 101. The antenna section 2 has a core section 5 and a conductor section 6 wound around the core section 5. In use, the antenna unit 2 transmits or receives radio waves for user ID authentication as described above. Therefore, when the user's fingertip, which is an object, enters the entry space 4 in a state where the user ID has been authenticated, the capacitance in the entry space 4 changes, and the presence of the fingertip is determined. The intention of the user to open the door is detected. Therefore, the door device is unlocked by operating a door lock device (not shown).
[0057]
As shown in FIGS. 8 and 9, the core section 5 is configured by laminating a plurality of core sheets 50 at intervals in the thickness direction thereof. The entire core section 5 is integrally embedded in the mold section 8 together with the coil section 60. Thereby, the moisture resistance, impact resistance, and flexibility of the core sheet 50 can be improved. An air layer 80 as a deformable layer is provided between the core sheets 50. Therefore, the deformation tolerance of the core sheet 50 is ensured, and the protection property is ensured even when an external load is applied. Note that the thickness of the air layer 80 can be reduced, and the core sheets 50 may actually be in contact with each other.
[0058]
According to the embodiment shown in FIG. 10, the entire core section 5 is integrally embedded in the mold section 8 together with the coil section 60, and a soft material layer 83 as a deformable layer exists between the core sheets 50. ing. The soft material layer 83 is integral with the mold section 8 and joins the core sheet 50. Therefore, the deformation tolerance of the core sheet 50 is ensured, and the protection of the core portion 5 is ensured even when an external load is applied. The soft material layer 83 can be formed of rubber or a soft resin, and examples thereof include urethane, epoxy, and silicon.
[0059]
9 and 10 are conceptual diagrams, and the number of core sheets 50 is actually large.
[0060]
11 to 13 show a third application example of each embodiment described above. This application example is a case where the present invention is applied to a door handle device 100 that opens and closes a door 200 of a building. In the example illustrated in FIG. 12, the door handle device 100 includes a handle 101 operated by a user's fingertip, and an opposing member 3 provided near the handle 101. Between the handle 101 and the opposing member 3, an entry space 4 into which the user's fingertip enters is formed. The antenna unit 2 is built in the handle 101. The opposing member 3 having conductivity is grounded via a ground wire (not shown).
[0061]
In the example illustrated in FIG. 13, the door handle device 100 includes a rotatable handle 101 operated by a user's fingertip, and an opposing member 3 provided near the handle 101. Between the handle 101 and the opposing member 3, an entry space 4 into which the user's fingertip enters is formed. The antenna unit 2 is built in the handle 101.
[0062]
Therefore, when the user's fingertip, which is the target object, enters the entry space 4, the capacitance in the entry space 4 changes, so that the presence of the fingertip is determined and the user's intention to open the door is detected. . Therefore, also in this application example, if the conditions of ID authentication based on transmission or reception of the antenna unit 2 and detection of a user's intention to open the door based on a change in capacitance are satisfied, a door lock device (not shown) is provided. Is activated and unlocked. Reference numeral 202 denotes a keyhole into which a normal key is inserted. When the door 200 has conductivity, the plate-shaped opposing member 3 can be eliminated, and the door 200 itself can be used as the opposing member.
[0063]
FIG. 14 shows a fourth application example of each embodiment described above. This application example is applied to a defective product detection device that determines the quality of parts in a manufacturing factory. As shown in FIG. 14, the sensor-equipped antenna device 1 includes an antenna unit 2 facing each other and a facing member 3 that is grounded via a ground wire (not shown). The antenna section 2 and the facing member 3 form an entry space 4 through which an inspection object 70 as an object can pass. When the inspection object 70 is a good product, the capacitance when the inspection object 70 enters the entrance space 4 is measured in advance. When the inspection object 70 is a defective product, the capacitance when the inspection object 70 enters the entry space 4 is predicted in advance. Therefore, when the inspection object 70 enters the entry space 4, the capacitance of the inspection object 70 is detected by the antenna unit 2 and the facing member 3. The quality of the inspection object 70 is determined according to the capacitance of the inspection object 70 in the entrance space 4. When the inspection object 70 is defective, the exit of the entrance space 4 is blocked by the blocking unit 79, and the passage of the inspection object 70 to the subsequent process is blocked. Further, a radio wave is transmitted from the antenna unit 2 to notify the receiving side that the inspection object 70 is defective.
[0064]
FIG. 15 shows a fifth application example of each embodiment described above. This application example is applied to an object contact detection device. As shown in FIG. 15, the sensor-equipped antenna device 1 includes an antenna unit 2 facing each other and an opposing member 3 that is grounded. The antenna section 2 and the facing member 3 form an entry space 4 through which an object 72 as an object can pass. When the object 72 enters the entry space 4, the capacitance of the entry space 4 changes, so that the entry of the object 72 is detected. Then, when the object 72 is detected, a radio wave is transmitted from the antenna unit 2 to notify the entry of the object 72 to the entry space 4 to the receiving side.
[0065]
Further, the number of objects that have entered the entry space 4 is counted based on the capacitance, and when the number of objects reaches a predetermined number, a radio wave transmitting that the number has reached the predetermined number is transmitted from the antenna unit 2. It may be applied to a counter device of a system.
[0066]
In addition, the present invention is not limited to only the above-described embodiment. For example, although the opposing member 3 is grounded via a ground wire, a non-grounded system may be used. Can be changed as appropriate. The following technical idea can be understood from the above description.
[Additional Item 1] An antenna portion including a core portion having a soft magnetic material having conductivity and a conductive wire portion attached to the core portion is provided,
An object detection device comprising an antenna device with a sensor, wherein at least a part of the soft magnetic material is a capacitance type sensor electrode. An object can be detected. In addition, detection of an object can be started by a radio wave received by the antenna unit, or information on the object can be notified by a radio wave transmitted from the antenna unit.
[0067]
【The invention's effect】
As described above, according to the present invention, the soft magnetic material having conductivity and soft magnetism of the core portion of the antenna unit has both the antenna function and the capacitance type sensor function. For this reason, it is possible to provide a sensor-equipped antenna device and a door handle device that can function as both an antenna and a capacitance-type electrode sensor.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a concept of an antenna device with a sensor according to a first embodiment.
FIG. 2 is a perspective view showing a concept of an antenna device with a sensor according to a second embodiment.
FIG. 3 is a perspective view showing a concept of an antenna device with a sensor according to a third embodiment.
FIG. 4 is a graph showing a relationship between use times of an antenna and a sensor.
FIG. 5 is a front view of a door handle device according to the first application example.
6 is a cross-sectional view of the door handle device according to the first application example, which is a cross-sectional view taken along line W7-W7 shown in FIG. 5;
FIG. 7 is a plan view of a door handle device according to a second application example.
FIG. 8 is a sectional view of a main part of a door handle device according to a second application example.
FIG. 9 is a cross-sectional view of a main part of a door handle device in a different direction according to the second application example.
FIG. 10 is a cross-sectional view of a main part of a door handle device in a different direction according to a different form of the second application example.
FIG. 11 is a configuration diagram of a door handle device according to a third application example.
FIG. 12 is a configuration diagram of a door handle device according to a third application example.
FIG. 13 is a configuration diagram of a door handle device according to a different embodiment according to a third application example.
FIG. 14 is a diagram showing a configuration applied to a defective product detection device in a factory according to a fourth application example.
FIG. 15 is a configuration diagram of a fifth application example applied to an object contact detection device in a factory.
[Explanation of symbols]
In the figure, 1 is an antenna device with a sensor, 2 is an antenna unit, 3 is an opposing member, 4 is an entry space, 5 is a core unit, 50A is a core sheet, 51 is a soft magnetic material, 6 is a conductor, and 60 is a coil unit. , 62 denotes an extension part, 68 denotes a detection part, 7 denotes an object, and 8 denotes a mold part.

Claims (6)

An antenna portion including a core portion having a soft magnetic material having conductivity and a conductive wire portion attached to the core portion is provided,
An antenna device with a sensor, wherein at least a part of the soft magnetic material is a capacitance type sensor electrode. An antenna portion including a core portion having a soft magnetic material having conductivity and a conductive wire portion attached to the core portion is provided,
At least a part of the soft magnetic material is a capacitance type sensor electrode,
An antenna device with a sensor, wherein the soft magnetic body is formed by laminating a plurality of core sheets. 3. The device according to claim 1, further comprising an opposing member provided opposite to the soft magnetic body so as to form an entry space into which the target can enter, between the soft magnetic body and the soft magnetic body. An antenna device with a sensor characterized by the above-mentioned. The antenna device with a sensor according to claim 3, wherein the opposing member is groundable. In any one of claims 1 to 4, further comprising a control unit that transmits or receives an electric signal to the conductor of the antenna unit,
The control unit is characterized in that the antenna unit use time for transmitting or receiving an electric signal to the conductor portion of the antenna unit is set to be different from the sensor use time for supplying power to the sensor electrode. Antenna device with sensor. An antenna portion including a core portion having a soft magnetic material having conductivity and a conductive wire portion attached to the core portion is provided,
A door handle device comprising an antenna device with a sensor, wherein at least a part of the soft magnetic material is a capacitance type sensor electrode.

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