JP2002321547A - Vehicular radio wave receiver built-in meter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve receiving performance of a radio wave receiver built-in meter device. SOLUTION: A ground pattern 511 formed on a meter circuit substrate 3 for controlling of meters 21A-21D, etc., is connected to a keyless entry receiver 7 to be used as the element of an antenna 8. Since the meter circuit substrate 3 has considerably a larger shape than the keyless entry receiver 7, it can fully secure the element length of the antenna 8, and even when the distance to a body grounding becomes longer, the effects of wire harness to antenna characteristics can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a meter device with a built-in radio wave receiver for a vehicle.

[0002]

2. Description of the Related Art A keyless entry system is a system for controlling the opening and closing of a door of a vehicle. The keyless entry system includes a keyless entry receiver mounted on a vehicle and a keyless entry transmitter built in a key or the like possessed by a driver. Become. The keyless entry transmitter transmits a transmission signal that modulates the ID code and operation command code assigned to each transmitter by the driver's operation, and the keyless entry receiver demodulates when it receives the transmission signal. To determine whether the ID code is from the transmitter paired with itself and, if affirmatively determined, outputs a control signal corresponding to the operation command code to the control ECU of each part of the vehicle to open and close the door and the engine. Perform starting, etc. As such a keyless entry system, a system using a weak radio wave in the 300 MHz band is mainly used.

It is desirable that the keyless entry system be operated in any direction around the vehicle as long as the driver is within a certain range from the vehicle. It will be installed in a place with good environment. In addition, the long layout of the feed line connecting the antenna and the keyless entry receiver, coupled with a complicated configuration,
In some cases, the antenna and the keyless entry receiver are installed in the same place and are substantially integrated, because they cause problems such as impedance matching.

Japanese Patent Application Laid-Open No. 8-216735 discloses a meter device with a built-in radio wave receiver in which a receiver and an antenna are built in a meter device for displaying driving information such as the speed of a vehicle to a driver. . This device has a feature that the antenna is close to the window glass and the driver is not much affected by the electromagnetic shielding by the metal body in any direction.

[0005]

In the keyless entry receiver, power is supplied via a wire harness, similarly to other electrical equipment, and a ground harness, which is a line on the ground side, has a wire end. , And is grounded by the body of the vehicle having a small ground resistance. For this reason, if a meter device including a keyless entry receiver and an antenna as in the technique of Japanese Patent Application Laid-Open No. 8-216735 is used, the keyless entry receiver is separated from the body, the ground harness becomes longer, and the layout of the wire harness depends on the layout. There is a possibility that the dead area (dip point) where the reception of radio waves from the transmitter becomes difficult due to a change in the directivity increases, or the antenna gain decreases due to an increase in the reactance of the antenna. For this reason, it is necessary to design the wiring harness layout, etc., with due care to optimize the electric field pattern of the antenna for each vehicle model with different body designs, etc. In some cases, it is difficult to avoid it to a practical level.

Further, as described above, the reception performance of the keyless entry receiver differs significantly depending on the installation environment, and interference with radio waves occurs when the keyless entry receiver is integrated with a meter device that is a device different from the keyless entry receiver. As a result, the expected performance may not be exhibited.

As described above, a meter device with a built-in radio wave receiver incorporating a radio wave receiver such as a keyless entry receiver may not be able to exhibit sufficient reception performance, and is not always practical. .

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a practical meter device with a built-in radio wave receiver of a vehicle having sufficient reception performance.

[0009]

According to the first aspect of the present invention, there is provided a meter circuit in which a control unit for controlling a display unit is mounted near a display unit for displaying driving information of a vehicle to a driver. A board, a radio wave receiver, and a radio wave built-in meter device of a vehicle in which an antenna is provided, wherein the radio wave receiver is formed on the meter circuit board as an element of the antenna, and the control unit is provided. Connect the ground pattern to be grounded.

[0010] The meter circuit board has a relatively large shape as compared with the radio wave receiver, and can have a long ground pattern. Therefore, by making the ground pattern function as an element of the antenna, a sufficient element length is secured, and the influence of the wire harness on the antenna characteristics can be reduced. In addition, the ground pattern fulfills the function of the antenna, thereby simplifying the configuration,
Cost reduction can be realized.

According to a second aspect of the present invention, in the configuration of the first aspect, a trunk line of the ground pattern is formed on the meter circuit board in a substantially horizontal direction.

The meter device has a horizontally long shape because different types of meters and the like are arranged in the horizontal direction, and the meter circuit board also has a horizontally long shape.
By forming the antenna using the trunk line of the ground pattern formed in the horizontal direction, the element length can be efficiently secured by utilizing the characteristic of the shape of the meter device.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the antenna is a dipole antenna, and a signal-side element or a ground-side element of the antenna is configured by the ground pattern. I do.

The antenna can be a dipole antenna. In this case, the ground pattern may be either the signal side element or the ground side element of the antenna.

According to a fourth aspect of the present invention, in the configuration of the first to third aspects, a resonance circuit is provided between the radio wave receiver and the ground pattern.

By providing the resonance circuit, the reception band can be limited and the noise resistance can be improved.

According to a fifth aspect of the present invention, in the configuration of the first to fourth aspects of the present invention, the radio wave receiver extends from the radio wave receiver.
An impedance element is inserted in the middle of the ground pattern.

Since the impedance at the location is increased by providing the impedance element, when viewed from the radio wave receiver, the point where the impedance element is inserted is separated on the high frequency circuit. The tip of the antenna having the ground pattern as an element can be defined at the insertion position of the impedance element, and the adjustment of antenna characteristics is easy.
Further, it is possible to reduce conduction noise mixed into the radio wave receiver via the ground pattern.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the impedance element is inserted into a connection portion with a connector connected to a wire harness.

Since the wire harness can be separated on the high-frequency circuit from the ground pattern functioning as an element of the antenna, the influence of the wire harness can be further reduced.

According to a seventh aspect of the present invention, in the configuration of the fifth aspect, the impedance element is inserted into a branch line branched from a trunk line of the ground pattern.

The branch line branching from the trunk line of the ground pattern usually changes its direction in a direction substantially perpendicular to the trunk line. Therefore, in a configuration in which such a branch line is a part of the antenna, the reactance of the antenna increases and the antenna gain increases. Acts in the direction of decreasing. By inserting an impedance element into the ground pattern branch line, the branch line can be removed from the component part of the antenna, and the antenna gain can be improved.

According to the present invention, a meter circuit board on which a control unit for controlling the display unit is mounted near a display unit which has a meter and displays driving information of the vehicle to the driver, and a radio wave receiver. A vehicle radio wave receiver built-in meter device provided with an antenna, wherein the meter circuit board, a vehicle radio wave receiver built-in meter device mounted with a high-frequency signal source, wherein the antenna Of the two areas defined by dividing the meter circuit board at the center in the horizontal direction, the meter circuit board is arranged in an area opposite to a high-frequency signal source area existing in the meter circuit board.

Since a space can be provided between the radio wave receiver and the high frequency signal source, the influence of noise from the high frequency signal source is reduced, and the radio wave receiver can exhibit sufficient reception performance. Accordingly, the influence of the wire harness on the antenna characteristics can be relatively reduced.

According to the ninth aspect of the present invention, a meter circuit board on which a control unit for controlling a display unit is mounted near a display unit having a meter and displaying driving information of a vehicle to a driver; In a meter device with a built-in radio wave receiver of a vehicle provided with an antenna, the meter circuit board, in the meter device with a built-in radio wave receiver of a vehicle mounted with a high-frequency signal source, the antenna, Of the two regions defined in the center of the meter circuit board in the vehicle height direction, the two regions are arranged in a region on the opposite side to the high-frequency signal source side region existing in the meter circuit substrate.

Since a space can be provided between the radio wave receiver and the high frequency signal source, the influence of noise from the high frequency signal source is reduced, and the radio wave receiver can exhibit sufficient reception performance. Accordingly, the influence of the wire harness on the antenna characteristics can be relatively reduced.

According to a tenth aspect of the present invention, in the configuration of the eighth or ninth aspect, the distance between the antenna and the high-frequency signal source is set between the periphery of the meter circuit board and the high-frequency signal source which belong to the region where the high-frequency signal source exists. Set to a distance or more.

Since the antenna can be sufficiently spaced from the high-frequency signal source, the influence of noise from the high-frequency signal source is further reduced.

According to the eleventh aspect of the present invention, in the configuration of the eighth to tenth aspects, the high-frequency signal source is a CPU or a power source.

When the radio wave receiver is arranged close to the CPU, noise that cannot be ignored is radiated. By setting the radio wave receiver away from the CPU or the like, the radio wave receiver exhibits sufficient reception performance. be able to.

According to the twelfth aspect of the present invention, there is provided a meter circuit board on which a control unit for controlling a display unit is mounted near a display unit having a meter and displaying driving information of the vehicle to a driver;
A radio wave receiver, a radio wave receiver built-in meter device of a vehicle provided with an antenna, the meter circuit board,
In a meter device with a built-in radio wave receiver of a vehicle in which a capacitive element is mounted together with a high-frequency signal source and the high-frequency signal source and the capacitive element are connected by a wiring pattern, the antenna is mounted on the meter circuit board in a horizontal direction. Of the two regions defined at the center, they are arranged in a region opposite to the region where the wiring pattern is formed.

The wiring pattern from the high-frequency signal source to the capacitive element acts as an antenna for radiating high-frequency noise from the high-frequency signal source. Sufficient reception performance can be exhibited. Accordingly, the influence of the wire harness on the antenna characteristics can be relatively reduced.

According to a thirteenth aspect of the present invention, in the configuration of the twelfth aspect, the distance between the antenna and the wiring pattern is set to be equal to the distance between the periphery of the meter circuit board belonging to the area where the wiring pattern is formed and the wiring pattern. Set to a distance equal to or greater than.

Since the antenna can be sufficiently spaced from the high-frequency signal source, the influence of noise from the high-frequency signal source is further reduced.

According to a fourteenth aspect of the present invention, in the configuration of the twelfth or thirteenth aspect, the high frequency signal source is C
PU, and the capacitive element is an LCD.

In the LCD, each pixel has a capacitor structure,
Noise that cannot be ignored when a radio wave receiver is placed close to the wiring pattern as an antenna for radiated noise from the CPU to the LCD radiates the radio wave receiver. The receiver can exhibit sufficient reception performance.

According to the present invention, a meter circuit board on which a control unit for controlling the display unit is mounted near a display unit having a meter and displaying driving information of the vehicle to the driver;
A radio wave receiver, a radio wave receiver built-in meter device of a vehicle provided with an antenna, the meter circuit board,
In a meter device with a built-in radio wave receiver for a vehicle in which a capacitive element is mounted together with a high-frequency signal source and the high-frequency signal source and the capacitive element are connected by a wiring pattern, at least a portion of the antenna element in the vicinity of a feeding point To
The wiring pattern is oriented in a direction substantially perpendicular to the main direction.

The wiring pattern extending from the high-frequency signal source to the capacitive element acts as an antenna for radiating high-frequency noise from the high-frequency signal source. However, the coupling between the antenna of the radio wave receiver and the wiring pattern is reduced. The radio receiver can exhibit sufficient reception performance. Accordingly, the influence of the wire harness on the antenna characteristics can be relatively reduced.

According to a sixteenth aspect of the present invention, in the configuration of the fifteenth aspect, at least a portion near the feed point of the antenna element is oriented substantially perpendicular to the main surface of the meter circuit board.

Thus, the connection between the antenna of the radio wave receiver and the wiring pattern can be reduced regardless of the direction in which the wiring pattern is formed from the high-frequency signal source.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A meter device with a built-in radio wave receiver according to the present invention will be described below with reference to the drawings. FIG. 1 shows a disassembled state of a meter device with a built-in radio wave receiver, and FIG. 2 shows a front view of a meter circuit board in a state where a keyless entry receiver which is a radio wave receiver is mounted. The meter device with a built-in radio receiver has an upper housing 11 and a lower housing 12 which are fitted in an instrument panel in a passenger compartment. 2 are provided. The display unit 2 is a speedometer 2
1A, tachometer 21B, water temperature gauge 21C, fuel gauge 21D
And the like. Behind the upper housing 11, the meter circuit board 3 and the keyless entry receiver 7 are arranged. The arrangement of the meters 21A to 21D is generally such that a tachometer 21B is disposed substantially at the center, as shown in the figure, and a speedometer 21A is located on the left side of the tachometer 21B.
A water temperature gauge 21C and a fuel gauge 21D, which are slightly smaller meters, are arranged on the right side. Therefore, the upper housing 1
1, the lower housing 12 and the meter circuit board 3 have an elongated shape in the vehicle horizontal direction.

A control section 4 for controlling the display section 2 is mounted on the meter circuit board 3. The control unit 4 includes:
Meter indication cross coil 42 corresponding to 21D and one-to-one
In addition to A, 42B, 42C, and 42D, an LCD 44 as a trip meter, a CPU 43 for controlling these, a power regulator 41 as a power supply to these, and a connector 6 connected to a wire harness are provided. On the surface of the meter circuit board 3, wiring patterns 51, 52, 54 and the like are formed.

The wiring pattern 51 is a ground pattern.
A trunk line 5 is provided slightly above the meter circuit board 3 in the vehicle width direction.
11 are formed in a belt shape, and both ends thereof reach almost both right and left ends of the meter circuit board 3. Ground pattern 5
Reference numeral 1 designates branch lines 512, 513, 514, and 515 branched from the main line 511 at a plurality of locations downward, so as to take the ground of a component mounted at a position distant from the ground pattern main line 511. Has become. For example, the ground pattern branch line 512 is connected to the ground side terminal of the cross coil for meter 42D. Also,
Another ground pattern branch line 514 is the power regulator 4
1 ground side terminal.

Inductors 53B, 53C, 53D, and 53E, which are impedance elements, are inserted at the bases of the branch lines 512 to 515, respectively, at the branches of the ground pattern trunk line 511 and the ground pattern branch lines 512 to 515.

The connector 6 is connected to the power supply regulator 41 via a power supply pattern 52, and is also connected to the ground pattern trunk 511 via an inductor 53A which is an impedance element for high frequency signals.

The wiring pattern 54 is connected to the CPU 43 and the L
The CPU 43 is connected to the CPU 44, and a control signal for image display is transmitted from the CPU 43 to the LCD 44.

The keyless entry receiver 7 constitutes a radio keyless entry system together with a keyless entry transmitter (not shown).
3 is formed. The reception circuit 73 includes an antenna input circuit, a tuning circuit, a demodulation circuit, and the like. The keyless entry transmitter transmits an ID code or an operation command code assigned to each transmitter as a modulation signal by a driver's operation. When the radio wave is received, it is demodulated to determine whether the ID code is from a keyless entry transmitter paired with itself. If a positive determination is made, a control signal corresponding to the operation command code is output to the control ECU of each part of the vehicle,
Open and close doors and start the engine.

The board 71 of the keyless entry receiver 7
Are mounted on the lower housing 12 side of the meter circuit board 3, and components constituting the receiving circuit 73 are mounted from the lower housing 12 side. Also, the meter circuit board 3
A receiving circuit 73 is provided on substantially the entire back surface of the substrate 71 facing the
The ground pattern 72 for wiring the ground side of the components constituting the above is formed. The power of the receiving circuit 73 is supplied from the ground harness via a connector (not shown) provided on a peripheral portion of the substrate 71.

An antenna input terminal 74 connected to the antenna input circuit of the receiving circuit 73 is provided on the substrate 71 of the keyless entry receiver 7.

The antenna 8 connected to the antenna input terminal 74 and the like is configured as follows, and functions as a dipole antenna as described later. Signal side element 8
Reference numeral 1 denotes a small-sized device in which an inductor is inserted in the middle, which is disposed between the keyless entry receiver 7 and the lower housing 12 and receives a signal from the reception circuit 7 via the antenna input terminal 74.
Enter 3 The ground-side elent is a feature of the present invention, and is constituted by the ground pattern trunk 511. That is, the ground pattern 72 is electrically connected to the connection terminal 55 provided on the meter circuit board 3, and the ground pattern trunk line 5 is connected through the connection terminal 55.
11 is connected.

Connection Terminal 55 and Ground Pattern Trunk Line 5
11, a capacitor 831 and an inductor 832 which are connected in parallel to form the resonance circuit 83 are interposed. The resonance frequency of the resonance circuit 83 matches the reception frequency band.

The ground pattern trunk line 511 is satisfactorily separated from the wire harness on the high frequency circuit by the inductor 53A.
Constitute a ground-side element as described later.

As described above, the keyless entry receiver 7 built in the meter device and the body are separated from each other, and the ground pattern 72 of the keyless entry receiver 7 that is grounded via the ground harness is substantially equivalent to the high frequency circuit. The antenna 8 functions as a dipole antenna.

That is, it is the signal-side element 81 and the ground pattern 51 that define antenna characteristics such as antenna gain and directivity, so that the influence of the wire harness can be suppressed. The ground pattern 51 has a long line length for grounding each of the mounted components on the meter circuit board 3 which is considerably larger than the keyless entry receiver 7, and a sufficient element length can be secured. In the present embodiment, the length of the ground pattern trunk 511 reaches the left and right ends of the meter circuit board 3 which is elongated in the horizontal direction. Therefore, the radio wave reflected in the vehicle interior can be efficiently received, and the antenna gain is improved.

Therefore, a good antenna electric field pattern with sufficient antenna gain and no dip point can be realized regardless of the layout of the wire harness or the like.

Further, since the resonance circuit 83 adapted to the reception frequency band is provided, the S / N of the keyless entry receiver 7 can be improved.

Further, a dipole antenna can be realized without separately providing a ground-side element of the antenna, so that the configuration can be simplified.

Also, ground pattern branch lines 512 to 51
At the base of 5, inductors 53B to 53E are provided, respectively, to separate the ground pattern trunk line 511 from the ground pattern branch lines 512 to 515 on the high frequency circuit. Thus, the ground pattern trunk 511 that extends substantially straight in the horizontal direction functions as an antenna element. Thereby, the reactance of the antenna 8 can be reduced, and the antenna gain can be further improved. Further, by providing the inductors 53A to 53E including the inductor 53A provided at the connection portion with the connector 6, it is possible to reduce the conduction noise transmitted through the ground pattern 51 from being mixed into the receiving circuit 73, and N is improved.

Although the resonance circuit 83 is constituted by an LC circuit, it may be constituted by only a capacitor or an inductor.

The signal-side element 81 may be omitted, and only the ground pattern trunk 511 and the resonance circuit 83 may be used as an antenna.

Further, instead of the inductors 53A to 53E, a ferrite may be arranged close to the ground pattern 51, and a portion of the ground pattern 51 adjacent to the ferrite may function as an impedance element.
A resistor may be inserted into the ground pattern 51 to serve as an impedance element.

Further, depending on the required antenna characteristics, the resonance circuit 83 and the inductors 53B to 53E can be omitted.

(Second Embodiment) FIG. 3 shows a meter device with a built-in radio wave receiver according to a second embodiment of the present invention. In the figure,
Portions that operate substantially the same as in the first embodiment are denoted by the same reference numerals, and differences from the first embodiment will be mainly described.

The connection terminal 55 of the meter circuit board 3 is formed at the position where the antenna input terminal 74 of the keyless entry receiver 7 is formed, and is connected to the antenna input terminal 74. 8A.

Also in this case, the ground pattern trunk can be used as an antenna element.

(Third Embodiment) FIG. 4 shows a meter device with a built-in radio wave receiver according to a third embodiment of the present invention. In the figure,
Portions that operate substantially the same as in the first embodiment are denoted by the same reference numerals, and differences from the first embodiment will be mainly described.

In the figure, Y is an imaginary line indicating the center of the meter circuit board 3 in the horizontal direction, and X is an imaginary line indicating the center of the meter circuit board 3 in the vehicle height direction (vertical direction in the figure). .
The CPU 43 controls the lower right area F of the four areas F1, F2, F3, and F4 defined by the virtual lines X and Y.
2 near the imaginary line X, a horizontally elongated LC
D44 is mounted across the lower right area F2 and the lower left area F3 across the virtual line Y. Then, the CPU 43 outputs L
A plurality of wiring patterns (hereinafter, referred to as LCD lines) 54 for transmitting control signals to the CD 44 are formed in a bundle. The LCD line 54 has a horizontal portion 541 extending horizontally in the vicinity of the LCD 44, and both ends 542 and 543 connected to the horizontal portion 541 are bent, and one end 542 is C-shaped.
The other end 543 is connected to the LCD 44. The horizontal portion 541 of the LCD line 54 is slightly deviated to the right with respect to the virtual line Y, and the main forming area is the lower right area F2.

On the other hand, the keyless entry receiver 7 is located at the upper left corner 30 of the meter circuit board 3 in the upper left area F4.
1 is implemented. As shown in FIG. 5, the antenna 8B projects from the substrate 71 in an inverted L-shape, and extends from a vertical linear portion 811 near the antenna input terminal 74 in a direction parallel to the main surface of the substrate 71. The bending horizontal portion 812 is directed downward.

As is well known, each pixel of the LCD 44 has a capacitor-structured cell, and the desired display is possible by switching between charging and discharging of the cell. Each of the LCD lines 54 has a capacitive end. It is grounded to a ground pattern (not shown) via the LCD 44 as an element.

The CPU 43 functions as a high-frequency signal source,
The degree of the influence of high-frequency noise resulting from this on the S / N of the keyless entry receiver 7 becomes a problem. When the inventors investigated the intensity of radiation noise on the meter circuit board 3, high-level noise was detected from the CPU 43 to the LCD 44. Since the CPU 43 is a node of the multiplex communication system for performing communication between the various parts of the vehicle, the CPU 43 operates in a sleep mode or the like even during parking or the like, and the noise continues to be radiated. In the conventional configuration in which the keyless entry receiver is simply built in the meter device, it has been clarified that the reception performance is reduced by this noise.

Although the leaked high-frequency noise also flows through the LCD line 54, a series resonance circuit is formed by the inductance component of the LCD line 54 and the LCD 44 as a capacitive element.
High frequency noise will be strongly radiated. The LCD line 54 as an antenna functions like a monopole type electric field antenna, and it is recognized that the field emission image has a pattern R as shown in FIG.

In the present embodiment, the keyless entry receiver 7 is arranged such that the CPU 43 that generates high-frequency noise and the upper left area symmetrical in the horizontal and height directions with respect to the lower right area F2 in which the LCD line 54 serving as an antenna is disposed. Of the F4, since it is arranged at the corner 301 of the meter circuit board 3,
The keyless entry receiver 7 is located farthest from the CPU 43 and the LCD line 54 on the meter circuit board 3. Thus, it is possible to prevent the S / N of the keyless entry receiver 7 from being reduced due to high frequency noise. Therefore, the influence of the wire harness on the characteristics of the antenna 8B can be relatively reduced.

As described above, the antenna 8B of the keyless entry receiver 7 is connected to the keyless entry receiver board 71.
Is protruded in an inverted L-shape from the main surface of the meter circuit board 3, that is, a portion close to the antenna input terminal 741 as a feeding point thereof, that is, a linear portion 811 perpendicular to the main surface of the board 71. Perpendicular to the plane of Therefore,
The LCD line 54 also faces in the vertical direction. The vertical linear portion 811 of the antenna 8B has the highest current density because it is close to the antenna input terminal 74 as a feeding point, but the coupling with the LCD line 54 that is perpendicular to the antenna vertical linear portion 811 is Sparse, LCD
The effect of the high-frequency noise radiated from the line 54 can be reduced.

As described above, the vertical linear portion 811 of the antenna 8B is perpendicular to the main surface of the meter circuit board 3, and the wiring pattern such as the LCD line 54 which functions as an antenna for radiating high frequency noise is formed by the LCD line. Even if they are present in addition to 54, they exhibit good noise resistance against them.

The antenna 8B has a parallel linear portion 812 parallel to the main surface of the keyless entry receiver board 71.
L which is formed downward and is formed in the horizontal direction
The direction is perpendicular to the CD line 54. Therefore,
It exhibits good resistance to noise from the LCD line 54 where strong noise is radiated.

In this embodiment, the keyless entry receiver 7 is arranged at a position farthest from the CPU 43 and the LCD line 54. However, the present invention is not limited to this. In the upper right area F1, the lower left area F3, or the upper left area F4 sandwiching the lines X and Y, the interval between the CPU 43 and the LCD line 54 is set to the right area F1, F2 or the lower area F2, F3.
The distance between the periphery of the meter circuit board 3 and the keyless entry receiver 7 is greater than or equal to the distance. This distance is determined by CPU4
3. The right area F1, F2 or the lower area F2, F2 of the meter circuit board 3 where the LCD line 54 is arranged.
3, among the positions farthest from the CPU 43 and the LCD line 54, and by further increasing the distance,
The S / N of the keyless entry receiver 7 is improved.

Further, the antenna 8B is oriented in the direction perpendicular to the main surface of the meter circuit board 3 in the vicinity of the power supply portion, so that the wiring pattern acting as the antenna of the noise source is formed in any direction to provide sufficient resistance. Although the noise characteristic is exhibited, the vertical direction may be directed only to the LCD line 54 where high frequency noise is strongly radiated.

In each of the above embodiments, the keyless entry receiver 7 is formed of a board separate from the meter circuit board 3, but the components constituting the reception circuit of the keyless entry receiver are mounted on the meter circuit board. The present invention can be applied to a mounted configuration.

The present invention can be applied not only to a keyless entry receiver but also to a meter device incorporating another radio wave receiver.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a meter device with a built-in radio wave receiver of the present invention.

FIG. 2 is a front view of a meter circuit board included in the meter device with a built-in radio wave receiver.

FIG. 3 is a front view of a meter circuit board constituting another meter device with a built-in radio wave receiver of the present invention.

FIG. 4 is a front view of a meter circuit board included in another meter device with a built-in radio wave receiver according to the present invention.

FIG. 5 is a view taken in the direction of arrow A in FIG. 4;

FIG. 6 is a diagram illustrating a radiation state of noise on the meter circuit board.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Upper housing 12 Lower housing 2 Display part 21A, 21B, 21C, 21D Meter 3 Meter circuit board 301 Corner part 4 Control part 41 Power supply regulator (power supply) 43 CPU (high frequency signal source) 44 LCD (capacitive element) 5 Wiring pattern 51 Ground pattern 511 Ground pattern trunk line 512, 513, 514, 515 Ground pattern branch line 52 Power supply pattern 53A, 53B, 53C, 53D, 53E Inductor (impedance element) 54 LCD line (wiring pattern) 6 Connector 7 Keyless entry receiver ( Radio wave receiver) 71 Board 72 Ground pattern 73 Receiving circuit 74 Antenna input terminal (feed point) 8, 8A, 8B Antenna F1, F2, F3, F4 area

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoyuki Miyagawa 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 2F041 EA08 3D020 BA13 BB01 BC10 BD05 3D044 BA03 BA14 BB01 BC07 BD04 BD13

Claims (16)

[Claims] 1. A meter circuit board on which a control section for controlling a display section is mounted, a radio receiver, and an antenna are arranged near a display section having a meter and displaying driving information of the vehicle to a driver. In the meter device with a built-in radio wave receiver of the installed vehicle, the radio wave receiver has an element of the antenna,
A meter device with a built-in radio wave receiver for a vehicle, wherein a ground pattern formed on the meter circuit board and grounding the control unit is connected. 2. The meter device with a built-in radio wave receiver of a vehicle according to claim 1, wherein a trunk line of the ground pattern is formed on the meter circuit board in a substantially horizontal direction. 3. The meter device with a built-in radio wave receiver for a vehicle according to claim 1, wherein the antenna is a dipole antenna, and a signal-side element or a ground-side element of the antenna is the ground. A meter device with a built-in radio wave receiver of a vehicle configured by a pattern. 4. A radio wave receiver with a built-in radio wave receiver for a vehicle according to claim 1, wherein a resonance circuit is provided between said radio wave receiver and said ground pattern. Built-in meter device. 5. The meter device with a built-in radio wave receiver of a vehicle according to claim 1, wherein an impedance element is inserted in the middle of a ground pattern extending from the radio wave receiver. apparatus. 6. The meter device with a built-in radio wave receiver of a vehicle according to claim 5, wherein the impedance element is inserted into a connection portion with a connector connected to a wire harness. 7. The meter device with a built-in radio wave receiver of a vehicle according to claim 5, wherein the impedance element is inserted into a branch line branching from a trunk line of the ground pattern. 8. A meter circuit board on which a control unit for controlling the display unit is mounted, a radio wave receiver, and an antenna are arranged near a display unit having a meter for displaying driving information of the vehicle to a driver. A meter device with a built-in radio wave receiver of a vehicle, wherein the meter circuit board has a radio wave receiver with a high-frequency signal source mounted thereon. A meter device with a built-in radio wave receiver for a vehicle, wherein the meter device is disposed in a region on a side opposite to a region on a side of a high-frequency signal source existing in the meter circuit board, among two regions partitioned at the center in the horizontal direction. . 9. A meter circuit board on which a control unit for controlling a display unit is mounted, a radio wave receiver, and an antenna are disposed near a display unit having a meter and displaying driving information of the vehicle to a driver. An installed vehicle radio wave receiver built-in meter device, wherein the meter circuit board, a vehicle radio wave receiver built-in meter device mounted with a high-frequency signal source, the antenna, the meter circuit board of the A meter device with a built-in radio wave receiver for a vehicle, which is arranged in a region opposite to a region on a side of a high-frequency signal source existing in the meter circuit board among two regions defined at a center in a vehicle height direction. 10. The meter device with a built-in radio wave receiver of a vehicle according to claim 8, wherein the distance between the antenna and the high-frequency signal source is set at the periphery of the meter circuit board belonging to the region where the high-frequency signal source exists. Meter device with a built-in radio wave receiver of a vehicle set at a distance equal to or greater than the distance between the radio frequency signal source. 11. The meter device with a built-in radio wave receiver of a vehicle according to claim 8, wherein the high-frequency signal source is a CPU or a power supply. 12. A meter circuit board on which a control unit for controlling a display unit is mounted, a radio wave receiver, and an antenna are arranged near a display unit having a meter and displaying driving information of a vehicle to a driver. A meter device with a built-in radio wave receiver of a vehicle, wherein a capacitive element is mounted on the meter circuit board together with a high-frequency signal source, and the high-frequency signal source and the capacitive element are connected by a wiring pattern. In the meter device with a built-in radio wave receiver, the antenna is disposed in a region on the opposite side of a region where the wiring pattern is formed, of two regions defined by dividing the meter circuit board at a center in a horizontal direction. A meter device with a built-in radio wave receiver for a vehicle. 13. The meter device with a built-in radio wave receiver of a vehicle according to claim 12, wherein a distance between the antenna and a wiring pattern is set to be equal to a periphery of a meter circuit board belonging to a region where the wiring pattern is formed. A meter device with a built-in radio wave receiver for vehicles set to a distance greater than or equal to the distance. 14. The meter according to claim 12, wherein the high-frequency signal source is a CPU, and the capacitive element is an LCD. apparatus. 15. A meter circuit board on which a control unit for controlling a display unit is mounted, a radio wave receiver, and an antenna are arranged near a display unit having a meter and displaying driving information of the vehicle to a driver. A meter device with a built-in radio wave receiver of a vehicle, wherein a capacitive element is mounted on the meter circuit board together with a high-frequency signal source, and the high-frequency signal source and the capacitive element are connected by a wiring pattern. The meter device with a built-in radio receiver according to claim 1, wherein at least a portion of the antenna element near a feed point is oriented in a direction substantially orthogonal to a main direction of the wiring pattern. Built-in meter device. 16. The meter device with a built-in radio wave receiver of a vehicle according to claim 15, wherein at least a portion of the antenna element in the vicinity of a feeding point is directed substantially perpendicular to a main surface of the meter circuit board. A meter device with a built-in radio wave receiver for a vehicle.