JP2012070314A - Device for inspecting receiver and method for inspecting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for inspecting a receiver and a method for inspecting the receiver that can perform the inspection of a receiving circuit without any increase in cost and without being affected by an antenna circuit.SOLUTION: A device for inspecting a receiver that performs the inspection of the receiver including an antenna, a receiving circuit, and a matching circuit performing impedance matching between the antenna and the receiving circuit includes an invalidation circuit including an impedance adjustment circuit that, when the invalidation circuit is connected to the receiver during the inspection and the matching circuit is viewed from the receiving circuit side, causes the state of the impedance to become the same as the state of the impedance when the receiving circuit is disconnected from the matching circuit and the matching circuit is viewed from the receiving circuit side.

Description

  The present invention relates to a receiver inspection apparatus and a receiver inspection method for performing wireless communication.

  The wireless device includes an antenna circuit and a transmission / reception circuit, and the transmission / reception circuit has a configuration in which a signal (high-frequency signal) is transmitted and received using the antenna circuit by being conductively connected to the antenna circuit via a line such as a microstrip line. Yes.

  In many cases, such a wireless device performs a characteristic evaluation inspection of a transmission / reception circuit at the final stage of the manufacturing process. In order to inspect the transmission / reception circuit, for example, an inspection connection portion is formed between the antenna circuit and the transmission / reception circuit, and an inspection device is connected to the inspection connection portion to inspect the transmission / reception circuit. Is called.

  If the antenna circuit and the transmission / reception circuit are conductively connected at the time of this inspection, the antenna circuit is affected by the influence of the antenna circuit (for example, an external noise from the antenna or an electrical effect caused by impedance mismatch between the antenna circuit and the transmission / reception circuit). The circuit characteristics cannot be accurately evaluated. For this purpose, a cutting part is formed in advance on the conduction path between the antenna circuit and the transmission / reception circuit, and the connection between the antenna circuit and the transmission / reception circuit is blocked by the cutting part, that is, the influence of the antenna circuit is reduced. The transmitter / receiver circuit is inspected in a state that does not reach the transmitter / receiver circuit. After the inspection, both ends of the cut portion are conductively connected by soldering and the antenna circuit and the transmitter / receiver circuit are conductively connected, and then the wireless device is shipped.

  However, a soldering failure that the both ends of the cut portion cannot be electrically connected due to the solder forming position deviating from the set forming position or the amount of solder being too small, or during the soldering operation. Problems such as failure of normal operation of the antenna circuit and the transmission / reception circuit occur due to the influence of heat. In addition, a wide space must be provided around the solder formation position so that the components of the antenna circuit and the transmission / reception circuit do not interfere with the soldering operation during the solder forming operation. There is also a problem that it is difficult to reduce the size of the circuit board on which the transmission / reception circuit is mounted, which prevents the wireless device from being reduced in size.

  Therefore, a switch circuit having an antenna circuit connection terminal, a transmission / reception circuit connection terminal, and an impedance part connection terminal is provided, and the switch circuit can freely connect and disconnect the conduction connection between the antenna circuit and the transmission / reception circuit. When the inspection of the transmission / reception circuit is performed, the conduction connection between the transmission / reception circuit and the antenna circuit is disconnected and the transmission / reception circuit and the impedance unit are conductively connected by the switching operation of the switch circuit. At this time, since the impedance unit has an impedance that is open at a high frequency when the impedance unit is viewed from the inspection connection unit, a wireless device that can inspect the transmission / reception circuit without being affected by the antenna circuit has been devised. (See Patent Document 1).

JP 2002-084207 A

  Patent Document 1 has a configuration in which a wireless device includes an impedance unit and a switch circuit, and these impedance unit and switch circuit are used only when evaluating the characteristics of a transmission / reception circuit. Not only does the problem remain, but it also raises the cost of the wireless device.

  Against the background of the above problems, an object of the present invention is to provide a receiver inspection device and a receiver inspection method capable of inspecting a receiver circuit without increasing the cost and without being affected by an antenna circuit. is there.

Means for Solving the Problems and Effects of the Invention

  A receiver inspection apparatus for solving the above-described problems is a receiver inspection apparatus that performs inspection of a receiver including an antenna, a reception circuit, and a matching circuit that performs impedance matching between the antenna and the reception circuit. It includes a disabling circuit that is connected to the receiver at the time of inspection and disables the electrical action of the antenna and the matching circuit on the receiving circuit.

  With the above configuration, a cutting part is formed in advance on the conduction path between the matching circuit and the receiving circuit, and the receiving circuit is inspected in this disconnected state. After this inspection, both ends of the cutting part are conductively connected with solder. In addition to saving the trouble of conducting and connecting the antenna circuit and the receiving circuit, the receiver does not include the impedance unit and the switch circuit as described above, so that the size can be reduced and the cost does not increase. In addition, the receiver characteristics can be accurately evaluated.

  Further, the invalidation circuit in the inspection apparatus of the receiver of the present invention includes a grounding unit for grounding a feeding point provided at a connection point between the antenna and the matching circuit, and invalidating an electrical action on the reception circuit of the antenna. A matching circuit invalidating unit that is connected between the matching circuit and the receiving circuit and invalidates an electrical action of the matching circuit on the receiving circuit.

  With the above configuration, it is possible to invalidate the electrical action on the receiving circuit for each of the antenna and the matching circuit. Further, by grounding the feeding point, not only the impedance of the antenna is invalidated, but also the inductance component between the feeding point and the ground included in the matching circuit can be invalidated.

  Further, the matching circuit invalidating unit in the inspection apparatus for a receiver according to the present invention has an impedance when the matching circuit is viewed from the receiving circuit side when the matching circuit invalidating unit is connected between the matching circuit and the receiving circuit. Includes an impedance adjustment circuit that is in the same state as the impedance when the matching circuit is viewed from the receiving circuit side when the connection between the receiving circuit and the matching circuit is disconnected.

  With the above configuration, it is possible to electrically create a state in which the cut portion is formed on the conduction path between the matching circuit and the reception circuit, and it is possible to save the trouble of forming the cut portion and conducting connection. In particular, in a vehicle, the impedance when the matching circuit is viewed from the receiving circuit side is different for each vehicle type depending on the mounting position of the receiver and the wiring around the receiver. However, since the inspection apparatus often does not reproduce the environment in which the receiver is actually mounted, impedance mismatch between the matching circuit and the receiving circuit is likely to occur. By connecting the impedance adjustment circuit as in the above configuration, impedance mismatch between the matching circuit and the receiving circuit can be prevented.

  Further, the matching circuit invalidating unit in the receiver inspection apparatus of the present invention includes an inductance element.

  With the above configuration, it is possible to cancel the capacitance component of the capacitor included in the matching circuit and invalidate the electrical action of the matching circuit on the receiving circuit.

  Moreover, the matching circuit invalidation part in the inspection apparatus of the receiver of this invention uses an anisotropic conductive sheet for the connection part with a matching circuit and a receiving circuit.

  An anisotropic conductive material is a connection material having three functions of adhesion, conductivity, and insulation at the same time. In particular, polymer materials called ACF (Anisotropic Conductive Film) and ACP (Anisotropic Conductive Paste) have electrical conductivity in the thickness direction at the crimped portion by thermocompression processing, On the other hand, it exhibits an electrical anisotropy that it has an insulating property with respect to the surface of the crimped portion. In recent years, ACF has been used as a contact material between an electrode to be inspected and an inspection electrode in an electrical property inspection of a semiconductor chip, a wafer, a package, a substrate, etc., and has excellent flexibility, heat resistance, dielectric properties, and a narrow pitch. An electrode capable of being formed and having repeated compression durability has been developed. With the above configuration, it is possible to ensure the durability of the matching circuit disabling unit.

  Also, the receiver inspection apparatus of the present invention inspects a receiver including a bandpass filter in the reception circuit.

  A band-pass filter (BPF) that passes only a signal of a predetermined frequency deteriorates the BPF pass characteristic due to the impedance of the antenna and the antenna matching circuit, and the characteristic or performance of the receiving circuit at the time of inspection is an original value (design) Value or ability value). However, due to the above structure, a receiver including a band-pass filter in the receiving circuit can be accurately inspected.

  Further, the receiver in the receiver inspection apparatus of the present invention includes a control signal receiving unit that receives a control signal transmitted from a portable wireless key by a user operation, and based on the received control signal, Used as a control signal receiver of a keyless entry system that locks and unlocks the door lock mechanism.

  With the above configuration, the inspection of the receiver (control signal receiving unit) of the keyless entry system can be performed without forming the cut part on the conduction path between the antenna circuit and the reception circuit, and without conducting the conductive connection of the cut part after the inspection. The receiver can be implemented without including the impedance unit and the switch circuit as described above.

  The receiver in the inspection apparatus of the receiver of the present invention is transmitted from the smart key based on the polling signal output unit for wirelessly outputting the polling signal for polling the portable smart key and the reception of the polling signal. An ID code receiving unit that receives the ID code, a collating unit that collates the received ID code with a master code stored in the ID code, and permits a predetermined operation in the vehicle based on the collation result. It is used as an ID code receiving unit of a smart entry system including an operation permission unit.

  With the above configuration, the same effects as the keyless entry system can be obtained in the smart entry system.

  In addition, a receiver inspection method for solving the above-described problems includes a receiver inspection that includes an antenna, a reception circuit, and a matching circuit that performs impedance matching between the antenna and the reception circuit. In a receiver inspection method executed by the apparatus, during the inspection, the receiver inspection apparatus invalidates an electrical action on the reception circuit of the antenna and the matching circuit included in the receiver inspection apparatus. A circuit is connected to the receiver to test the receiver.

  With the above configuration, a cutting part is formed in advance on the conduction path between the matching circuit and the receiving circuit, and the receiving circuit is inspected in this disconnected state. After this inspection, both ends of the cutting part are conductively connected with solder. In addition to saving the trouble of conducting and connecting the antenna circuit and the receiving circuit, the receiver does not include the impedance unit and the switch circuit as described above, so that the size can be reduced and the cost does not increase. In addition, the receiver characteristics can be accurately evaluated.

  Further, the invalidation circuit in the inspection method of the receiver of the present invention includes a grounding unit for grounding a feeding point provided at a connection point between the antenna and the matching circuit and invalidating an electric action on the reception circuit of the antenna. A matching circuit invalidating unit that is connected between the matching circuit and the receiving circuit and invalidates an electrical action of the matching circuit on the receiving circuit.

  With the above configuration, it is possible to invalidate the electrical action on the receiving circuit for each of the antenna and the matching circuit. Further, by grounding the feeding point, not only the impedance of the antenna is invalidated, but also the inductance component between the feeding point and the ground included in the matching circuit can be invalidated.

  Further, the matching circuit invalidating unit in the receiver inspection method of the present invention has an impedance when the matching circuit is viewed from the receiving circuit side when the matching circuit invalidating unit is connected between the matching circuit and the receiving circuit. Includes an impedance adjustment circuit that is in the same state as the impedance when the matching circuit is viewed from the receiving circuit side when the connection between the receiving circuit and the matching circuit is disconnected.

  With the above configuration, it is possible to electrically create a state in which the cut portion is formed on the conduction path between the matching circuit and the reception circuit, and it is possible to save the trouble of forming the cut portion and conducting connection. In particular, in a vehicle, the impedance when the matching circuit is viewed from the receiving circuit side is different for each vehicle type depending on the mounting position of the receiver and the wiring around the receiver. However, since the inspection apparatus often does not reproduce the environment in which the receiver is actually mounted, impedance mismatch between the matching circuit and the receiving circuit is likely to occur. By connecting the impedance adjustment circuit as in the above configuration, impedance mismatch between the matching circuit and the receiving circuit can be prevented.

  Further, the matching circuit invalidating unit in the receiver inspection method of the present invention includes an inductance element.

  With the above configuration, it is possible to cancel the capacitance component of the capacitor included in the matching circuit and invalidate the electrical action of the matching circuit on the receiving circuit.

  Moreover, the matching circuit invalidation part in the inspection method of the receiver of this invention uses an anisotropic conductive sheet for the connection part with a matching circuit and a receiving circuit.

  An anisotropic conductive material is a connection material having three functions of adhesion, conductivity, and insulation at the same time. In particular, polymer materials called ACF (Anisotropic Conductive Film) and ACP (Anisotropic Conductive Paste) have electrical conductivity in the thickness direction at the crimped portion by thermocompression processing, On the other hand, it exhibits an electrical anisotropy that it has an insulating property with respect to the surface of the crimped portion. In recent years, ACF has been used as a contact material between an electrode to be inspected and an inspection electrode in an electrical property inspection of a semiconductor chip, a wafer, a package, a substrate, etc., and has excellent flexibility, heat resistance, dielectric properties, and a narrow pitch. An electrode capable of being formed and having repeated compression durability has been developed. With the above configuration, it is possible to ensure the durability of the matching circuit disabling unit.

The block diagram which shows the structure of a receiver. The block diagram which shows the structure at the time of the test | inspection of a receiver. The block diagram which shows the state of an antenna and a matching circuit when a GND pin is connected to a feeding point. The block diagram which shows the state of an antenna and a matching circuit when the matching circuit invalidation pin following FIG. 3 is connected. The figure which shows the detail of the connection of a receiver and an inspection apparatus. The figure which shows the detail of the connection form to the board | substrate of a GND pin and a matching circuit invalidation pin. The figure which shows the detail of a structure of a matching circuit invalidation pin. The figure which shows the comparison result of a BPF passage characteristic. The figure which shows the comparison result of the sensitivity characteristic of a receiving circuit. The block diagram which shows the structure of a smart entry system. The block diagram which shows the structure of a keyless entry system.

  Hereinafter, a receiver inspection apparatus and a receiver inspection method according to the present invention will be described with reference to the drawings. First, main applications of the receiver of the present invention will be described. The receiver of the present invention is used, for example, in a smart entry system or a keyless entry system mounted on a vehicle.

  FIG. 10 shows an example in which the receiver of the present invention is used in a smart entry system. The smart entry system 100 includes an in-vehicle device 1 and a portable device 2. The in-vehicle device 1 includes an ECU 10, an LF transmission unit 11, an RF reception unit 12, a memory 14 composed of a nonvolatile storage medium such as a flash memory, an engine switch 15, and a door antenna 16 (a general term for 16FR, 16RR, 16FL, and 16RL). , An indoor antenna 17, an antenna 18 inside the trunk, an antenna 19 outside the trunk, and the like. The RF receiver 12 corresponds to the receiver of the present invention.

  The ECU 10 (collation unit, operation permission unit) is configured as a computer including a well-known CPU, a ROM or RAM in which various programs are stored, a signal input / output circuit (all not shown), and the like. And various functions as the vehicle-mounted apparatus 1 are implement | achieved because CPU runs this program.

  The LF transmission unit 11 (polling signal output unit) transmits a radio signal to the portable device 2 using radio waves in the LF band (for example, 100 kHz band). Further, the radio signal transmitted from the LF transmitter 11 passes through the door antenna 16, the indoor antenna 17, the trunk internal antenna 18, and the trunk external antenna 19 at four locations, in the vicinity of the door (outside the passenger compartment), in the passenger compartment, It reaches only within a limited communication area inside the trunk and near the outside of the trunk.

  The RF receiving unit 12 (ID code receiving unit) receives a radio signal transmitted from the portable device 2 using, for example, a UHF band (300 MHz) radio wave among RF (high frequency) signals. Thereby, even if the output level of the portable device 2 is relatively weak, a communication distance can be appropriately obtained, and a response signal from the portable device 2 can be received more reliably.

  The engine switch 15 is a switch operated by the user when starting the engine. When the operation of the engine switch 15 is detected by a signal from the engine switch 15, the ECU 10 is permitted to start the engine. If the engine start is permitted, an engine start signal is transmitted from the ECU 10 to the engine control system.

  The portable device 2 (smart key) includes a control IC 20, an LF receiver 21, an RF transmitter 22, push switches 24 to 26, a display 27, a memory 30 formed of a nonvolatile storage medium such as a flash memory, and the like. .

  The control IC 20 is configured as a computer including, for example, a well-known CPU, a ROM or RAM in which various programs are stored, a signal input / output circuit (all not shown), and the like. Then, the CPU executes the program to realize various functions as the portable device 2.

  The LF receiving unit 21 receives a radio signal transmitted from the in-vehicle device 1 using an LF band radio wave. The RF transmission unit 22 transmits a radio signal to the in-vehicle device 1 using, for example, a radio wave in the UHF band.

  The push switches 24 to 26 are prepared mainly as a trigger key for using the keyless entry function. When a one-push operation is performed, for example, the push switch 24 locks the door and the push switch 25. Then, the door is unlocked, and the push switch 26 unlocks the trunk.

  The display device 27 is constituted by, for example, electronic paper that does not require power consumption or can be minimized during display, and displays the operation state of the portable device 2 by a message or the like.

  In the smart entry system 100, the in-vehicle device 1 transmits a WAKE request signal for canceling the sleep state of the portable device 2 and performing a normal operation to the portable device 2 via the LF transmission unit 11. On the in-vehicle device 1 side, when the RF receiving unit 12 has correctly received the WAKE response signal from the portable device 2, a verification request signal (polling signal) for requesting transmission of an ID code is transmitted to the portable device 2. On the in-vehicle device 1 side, the RF receiving unit 12 receives the verification request response signal (ID code) from the portable device 2, and the ECU 10 verifies the ID code. Then, depending on the collation result, door unlocking, engine start permission (engine switch 15 on instruction, etc.), collation processing retry, and the like are performed. Since these are not directly related to the present application, details are omitted.

  Moreover, you may use the receiver of this invention for a keyless entry system. FIG. 11 shows an example of the configuration of the keyless entry system 200. The keyless entry system 200 includes an in-vehicle device 1 and a portable device 2. The difference from the smart entry system 100 of FIG. 10 is a configuration unique to the smart entry system, that is, the LF transmitter 11, the door antenna 16, the indoor antenna 17, the antenna inside the trunk 18, and the antenna outside the trunk 19 (the above is the in-vehicle device 1 side). ) And the LF receiver 21 (the above is the portable device 2 side).

  In the keyless entry system, the RF receiver 12 (control signal receiver) receives a control signal transmitted from the RF transmitter 22 of the portable device 2 (wireless key) by the user's operation of the push switches (24 to 26). Based on the received control signal, the door lock mechanism (not shown) of the vehicle is locked and unlocked. Since these are not directly related to the present application, details are omitted. The RF receiver 12 corresponds to the receiver of the present invention.

  FIG. 1 shows a configuration of an RF receiver (hereinafter referred to as “receiver”) 12 which is a receiver of the present invention. The receiver 12 includes an antenna (ANT) 121, a matching circuit 122, a BPF (bandpass filter) 126, a detection IC 127, a local oscillation (local transmission) circuit 128, a waveform shaping circuit 129, and the like. Among these, the BPF 126, the detection IC 127, the local oscillation circuit 128, and the waveform shaping circuit 129 are configured as a part of the reception circuit 120.

  The matching circuit 122 performs impedance matching with the antenna 121, and is known as a so-called T-type or π-type, and the circuit configuration is determined according to the frequency band of the radio wave to be used. In this embodiment, as shown in FIG. 3, the π type generally having higher matching accuracy than the L type is used. In the example of FIG. 3, a coil L1 is disposed on the input side of the transmission path between the antenna 121 and the receiving circuit 120 to the ground, and a capacitor C4 is disposed on the output side, and the capacitors C1 and C2 are disposed on the transmission path between the coil L1 and the capacitor C4. , C3. When mounted on a vehicle, the change in impedance caused by the surrounding environment where the receiver such as the vehicle body (metal) or wiring is attached is adjusted by changing the capacitance of the capacitors (C1, C2, C3, C4). is doing.

  The antenna 121 has a shape exemplified in, for example, Japanese Patent Laid-Open No. 2009-284000, and the feeding point 161 is formed on a circuit board (see FIG. 6).

  The BPF 126 is for outputting only a desired frequency component of the radio wave received by the antenna 121. The detection IC 127 performs detection by mixing the signal output from the BPF 126 and the local oscillation signal output from the local oscillation circuit 128, and outputs a detection signal. The detection signal output from the detection IC 127 is output to the waveform shaping circuit 129, and the waveform shaping circuit 129 generates data signals (the above-described response signals, control signals, etc.) and inputs them to the ECU 10. Note that the receiving circuit 120 is a well-known one and will not be described in further detail.

  FIG. 2 shows a state when the receiver 12 is connected to the inspection device 150. The entire configuration of the inspection apparatus 150 is a test in which an inspected circuit board to be inspected is set on a table, and the same power and signals as those mounted on an actual device are input to the inspected circuit board and implanted in the table. Similar to a conventional in-circuit tester that inspects whether an electronic component is correctly mounted on a circuit board by bringing a pin into contact with a terminal to be inspected such as an electronic component, which is a predetermined inspection point of the circuit board to be inspected. Since the configuration is well known to those skilled in the art, a detailed description thereof is omitted here.

  Note that the inspection range of the receiver according to the prior art is only the reception circuit 120 because the reception circuit 120 and the matching circuit 124 are separated from each other. However, in the configuration of the present invention, the entire receiver 12 is defined as the inspection range. can do.

  In addition, the inspection device 150 includes a ground (GND) pin 130 and a matching circuit invalidation pin 140. The GND pin 130 is connected to a feeding point 161 provided on the substrate 160 (see FIG. 6) of the receiver 12 and grounds the feeding point 161 (that is, the antenna 121). The matching circuit invalidating pin 140 is connected between the wiring pattern 124 that connects the matching circuit 122 and the BPF 126 (that is, the receiving circuit 120) and the ground, and the impedance of the matching circuit 122 viewed from the receiving circuit 120 side. Is invalidated (details will be described later). The GND pin 130 corresponds to the invalidation circuit and the grounding unit of the present invention. The matching circuit invalidating pin 140 corresponds to the invalidating circuit and the matching circuit invalidating unit of the present invention.

  FIG. 3 shows the state of the antenna 121 and the matching circuit 122 when the GND pin 130 is connected to the feeding point 161. Since the GND pin 130 is connected so as to bypass the coil L1 of the matching circuit 122, not only the electrical action (external noise and impedance) by the antenna 121 on the receiving circuit 120 is invalidated, but also the electrical by the coil L1. Effects are also invalidated. That is, the state is the same as when the antenna 212 and the coil L1 are not connected.

  FIG. 4 shows the state of the antenna 121 and the matching circuit 122 when the matching circuit disabling pin 140 is further connected in the state of FIG. As shown in FIG. 4, the matching circuit invalidation pin 140 includes the coil L2, and the inductance of the coil L2 is invalidated so as to invalidate the impedance of the matching circuit 122 viewed from the BPF 126, which is generated by the capacitors C1 to C3. Is set.

Note that invalidation means one of the following.
The impedance of the matching circuit 122 viewed from the BPF 126 (that is, the receiving circuit 120) is set to zero.
The impedance of the matching circuit 122 viewed from the BPF 126 is the same as the impedance of the matching circuit 122 viewed from the BPF 126 when the wiring pattern 124 is cut (that is, the connection between the matching circuit 122 and the receiving circuit is disconnected).

  FIG. 5 shows details of the connection between the receiver 12 and the inspection device 150. For example, components constituting the receiver 12 such as the antenna 121, the matching circuit 122, and the BPF 126 are mounted on the surface of the substrate 160 which is a double-sided mounting substrate (which may be a single-sided substrate or a multilayer substrate). On the back surface of the substrate 160, in addition to the pattern wiring for connecting each circuit and element, the test pins 151 for inspection provided in the inspection jig 150a included in the inspection apparatus 150 or the function measurement of the receiver 12 A test land (also referred to as a test pad, not shown) for contacting the probe 153 is provided. Then, by raising the inspection jig 150a toward the substrate 160, each test pin comes into contact with the corresponding test land.

  The GND pin 130, the matching circuit invalidation pin 140, and the test pin 151 are connected to the main body (not shown) of the inspection apparatus 150 via the connector 152a as the test pin group 152. A predetermined potential or signal is applied to the test pin. The probe 153 is connected to the main body of the inspection apparatus 150 or a measuring instrument (both not shown) via the probe cable 153b and the connector 153a. Moreover, the connector 165 is for connecting the receiver 12 to the board of the ECU 10, for example.

  FIG. 6 shows details of the connection form of the GND pin 130 and the matching circuit invalidation pin 140 to the board. The GND pin 130 has the same configuration as that of the other test pins 151, is formed of a conductive member, and the inspection device 150 side is grounded. The antenna 121 has a feeding point 161 on the substrate 160, and a through hole 161 a penetrating the substrate 160 is formed at the feeding point 161, and a test land 161 b is formed on the back surface of the substrate 160. The test land 161 is electrically connected to the feeding point 161. Then, the upper end portion of the GND pin 130 contacts the test land 161, thereby grounding the feeding point 161.

  The matching circuit disabling pin 140 has two contacts 141 and 142. For example, the matching circuit invalidating unit 149 including the above-described coil L2 is connected between the contact points 141 and 142. In addition, a through hole 162a is formed in the substrate 160 to connect the wiring pattern 124 that connects the matching circuit 122 and the receiving circuit and the test land 162 on the back surface of the substrate 160 so as to be conductive. A test land 163 connected to the GND pattern 163 a on the substrate 160 is formed on the back surface of the substrate 160. Then, the matching circuit 122 is invalidated by the upper surface of the contact 141 contacting the test land 162 and the upper surface of the contact 142 contacting the test land 163.

  Details of the configuration of the matching circuit disabling pin 140 will be described with reference to FIG. First, as shown in FIG. 7 (a), the matching circuit disabling pin 140 includes, for example, two contact points 141 and 142, which are conductive rod-shaped members, and the contact points 141 and 142 and the contact points 141 and 142, respectively. A printed circuit board 143 on which the connected matching circuit invalidating unit 149 is mounted, a base member 144 that fixes the printed circuit board 143, a rod-shaped member 145 that supports the base member 144, and a housing 146 that houses the rod-shaped member 145 are included. It consists of In addition, a spring 147 is housed in the housing 146, and an elastic force is applied to the bottom of the rod-shaped member 145 to connect the matching circuit disabling pin 140 to the substrate 160 (that is, the test lands of the contacts 141 and 142). Contact) is made more reliable.

  FIG. 7B shows another example of the configuration of the matching circuit invalidating pin 140. Since this is a modified example of FIG. 7A, the same reference numerals are given to portions having the same configuration, and detailed description thereof is omitted. A difference from FIG. 7A is that an anisotropic conductive sheet is used as the contacts 141a and 142a in place of the contacts 141 and 142 which are conductive rod-shaped members.

  Also, the contact points (141a, 142a) of the anisotropic conductive sheet that abuts the substrate at the surface are the test pins of the inspection jig 150a compared to the contact points (141, 142) of the rod-shaped member that abuts the substrate at a point. When contacting the corresponding test land of the substrate 160, there is an advantage that the accuracy of the contact position is not required. Moreover, since it is excellent also in repetition durability and is not harder than a rod-shaped member, a board | substrate is not damaged at the time of contact | abutting.

  FIG. 8 shows a comparison result of signal pass characteristics (BPF pass characteristics) in the BPF 126. The closer the transmission loss is to 0 dB, the better the signal transmission characteristics. FIG. 8A shows a measurement with the conventional matching circuit 122 and the receiving circuit 120 separated from each other as A, and B shows a measurement with the matching circuit 122 and the receiving circuit 120 connected to each other. The measurement is performed with the matching circuit 122 and the receiving circuit 120 having the configuration of the present invention connected, and the GND pin 130 and the matching circuit invalidation pin 140 being connected. FIG. 8B is an enlarged view of the vicinity of the peak (frequency: 314 MHz) of the output of the BPF 126 in FIG. As shown in FIG. 8, the BPF pass characteristic in the state B is greatly deteriorated compared to the state A, but the BPF pass characteristic in the state C is almost the same as the state A (the loss difference is about 1 dB). This shows that the configuration of the present invention is effective.

  FIG. 9 shows a comparison result of sensitivity (circuit sensitivity) characteristics of the reception circuit 120. The lower the circuit sensitivity value, the better the circuit sensitivity. The conditions A to C are the same as those in FIG. The sensitivity characteristic in the C state has a loss of 1 to 2 dB compared to the A state, but the sensitivity characteristic in the B state has a loss of about 20 dB compared to the A state. Therefore, in FIG. 9, the sensitivity characteristic in the state B is not shown because it is located outside (upper) the frame of the graph.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

1 In-vehicle device 2 Mobile device (smart key, wireless key)
10 ECU (collation unit, operation permission unit)
11 LF transmitter (polling signal output unit)
12 RF receiver (receiver, ID code receiver, control signal receiver)
100 Smart Entry System 120 Receiving Circuit 121 Antenna (ANT)
122 matching circuit 124 wiring pattern 126 BPF (band pass filter)
127 Detection IC
128 Local transmission (local transmission) circuit 129 Waveform shaping circuit 130 Ground (GND) pin (invalidation circuit, grounding part)
140 Matching circuit invalidation pin (invalidation circuit, matching circuit invalidation part)
L2 coil (inductance element)
141a, 142a contact (anisotropic conductive sheet)
150 Inspection device 160 Substrate 161 Feed point 200 Keyless entry system

Claims (13)

In a receiver inspection apparatus that inspects a receiver including an antenna, a reception circuit, and a matching circuit that performs impedance matching between the antenna and the reception circuit,
An inspection apparatus for a receiver, comprising: an invalidation circuit that is connected to the receiver at the time of the inspection and invalidates an electrical action of the antenna and the matching circuit on the reception circuit. The invalidation circuit includes:
Grounding a feeding point provided at a connection point between the antenna and the matching circuit, and invalidating an electrical action of the antenna on the receiving circuit;
A matching circuit disabling unit connected between the matching circuit and the receiving circuit to invalidate an electrical action of the matching circuit on the receiving circuit;
The receiver inspection device according to claim 1, comprising:   The matching circuit invalidating unit has an impedance when the matching circuit is viewed from the receiving circuit side when the matching circuit invalidating unit is connected between the matching circuit and the receiving circuit. 3. The receiver inspection apparatus according to claim 2, further comprising an impedance adjustment circuit configured to be in the same state as an impedance when the matching circuit is viewed from the receiving circuit side when the connection between the matching circuit and the matching circuit is disconnected. .   4. The receiver inspection apparatus according to claim 2, wherein the matching circuit invalidating unit includes an inductance element.   5. The receiver inspection apparatus according to claim 2, wherein the matching circuit invalidating unit uses an anisotropic conductive sheet at a connection portion between the matching circuit and the receiving circuit. 6.   The receiver inspection apparatus according to claim 1, wherein the receiver circuit includes a bandpass filter for inspection.   The receiver includes a control signal receiving unit that receives a control signal transmitted from a portable wireless key by a user operation, and locks and unlocks a door lock mechanism of the vehicle based on the received control signal. The receiver inspection apparatus according to any one of claims 1 to 6, wherein the inspection apparatus is used as the control signal receiving unit of a keyless entry system.   The receiver includes a polling signal output unit that wirelessly outputs a polling signal for polling a portable smart key, and an ID code reception that receives an ID code transmitted from the smart key based on reception of the polling signal Smart entry system comprising: a collating unit that collates the received ID code with the master code stored in itself, and an operation permission unit that permits a predetermined operation in the vehicle based on the collation result The receiver inspection apparatus according to claim 1, wherein the receiver inspection apparatus is used as the ID code receiving unit. In a receiver inspection method executed by a receiver inspection device, inspecting a receiver including an antenna, a receiver circuit, and a matching circuit that performs impedance matching between the antenna and the receiver circuit,
In the inspection, the receiver inspection device includes an invalidation circuit that is included in the receiver inspection device and invalidates an electrical action of the antenna and the matching circuit on the reception circuit. The receiver inspection method is characterized in that the receiver is inspected by being connected to the receiver. The invalidation circuit includes:
Grounding a feeding point provided at a connection point between the antenna and the matching circuit, and invalidating an electrical action of the antenna on the receiving circuit;
A matching circuit disabling unit connected between the matching circuit and the receiving circuit to invalidate an electrical action of the matching circuit on the receiving circuit;
The receiver inspection method according to claim 9, comprising:   The matching circuit invalidating unit has an impedance when the matching circuit is viewed from the receiving circuit side when the matching circuit invalidating unit is connected between the matching circuit and the receiving circuit. The receiver inspection method according to claim 10, further comprising: an impedance adjustment circuit configured to be in the same state as the impedance when the matching circuit is viewed from the receiving circuit side when the connection between the matching circuit and the matching circuit is disconnected. .   12. The receiver inspection method according to claim 10, wherein the matching circuit invalidating unit includes an inductance element.   13. The receiver inspection method according to claim 10, wherein the matching circuit invalidating unit uses an anisotropic conductive sheet at a connection portion between the matching circuit and the receiving circuit.