JP3702013B2 - In-vehicle load remote control radio wave transmitter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is a device carried by a vehicle owner or the like, which transmits a radio signal from the vicinity of the vehicle to a vehicle-side receiving device and remotely controls various loads such as a door lock actuator mounted on the vehicle. The present invention relates to an improvement of a radio transmission device for remote control.
[0002]
[Prior art]
As this type of prior art, for example, there is a technique disclosed in Japanese Utility Model Laid-Open No. 5-82699. This prior art shows a device for remotely controlling various loads mounted on a vehicle by transmitting a radio signal from the vicinity of the vehicle to the vehicle-side receiving device in the same manner as the on-vehicle load remote control radio transmitting device of the present invention. It has been proposed for the purpose of reducing the number of necessary operation switches, improving operability, and improving the degree of freedom in external design.
[0003]
[Problems to be solved by the invention]
However, in this type of on-board load remote control radio wave transmitting apparatus of this type, a radio wave whose electric field strength is weak due to regulations in the Radio Law, for example, an electric field strength measured at a point 3 m away from the transmission point must be 500 μV or less must be used. Therefore, if the directivity of the outgoing radio wave is remarkable, the following problems occur. In other words, when radio waves are transmitted with the orientation of the device in a certain direction, the radio waves can be received by the vehicle-side receiving device even if they are relatively far from the vehicle, but the radio waves are transmitted in another direction. In this case, there is a problem that the vehicle-side receiving device cannot receive the transmitted radio wave unless it is very close to the vehicle.
In addition, when the directivity of the transmitted radio wave is significant, the output of the radio wave transmitter must be set so that the electric field strength measured in the direction with strong directivity does not deviate from the regulation value of the Radio Law. There was a problem that the output of the device could not be maximized.
The present invention solves the above-described problems, and by reducing the directivity of the transmitted radio wave transmitted by the radio wave transmitting device, the vehicle-side receiving device may not receive the transmitted radio wave depending on the attitude of the device, To provide a radio transmitter for on-board load remote control that solves the problem that the output of the radio transmitter cannot be maximized so that the electric field strength in the sex direction is within the limits of the Radio Law. It is intended.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, first, the invention according to claim 1 is directed to a radio wave transmitting device that transmits a radio wave signal to a vehicle-side receiving device, wherein a substrate on which an oscillation circuit is mounted, and the oscillation circuit are electrically connected. And a substantially serrated pattern antenna connected in a curved line on the substrate , the pattern antennas being first conductive patterns each having a certain length, arranged in a row on the first surface of the substrate A first conductive pattern, a second conductive pattern each having a certain length, the second conductive pattern arranged on the second surface of the substrate, and each end of the second conductive pattern and the first conductive pattern the parts comrades through the substrate is constituted by a through hole that is electrically connected to these first conductive pattern, automotive negative forming a pattern antenna of the substantially sawtooth by a second conductive pattern and the through hole Providing remote control radio wave transmitting device.
[0005]
According to a second aspect of the present invention, there is provided an in-vehicle load remote control radio wave transmitting apparatus in which the substantially sawtooth pattern antennas are connected in a substantially U shape.
[0007]
【Example】
This embodiment exemplifies a radio wave key using the technology of the present invention. The radio wave key transmits a radio signal to the vehicle-side receiving device, thereby remotely controlling a door lock actuator provided in the vehicle door lock mechanism to lock (lock) and unlock (unlock) the vehicle door. Is.
1 is a perspective view of the substrate 3, FIG. 2 is a perspective view of the radio wave transmitter 1, and FIG. 3 is an electrical circuit diagram of the oscillation circuit 2 and the like built in the radio wave transmitter 1. In the figure, 1 is a radio wave transmitter, 2 is an oscillation circuit, 3 is a substrate, 4 is a pattern antenna, 5 is a case, 61, 62 and 63 are first, second and third push buttons, and 7 is a battery. Hereinafter, each of these configurations will be described.
[0008]
First, the radio wave transmitting device 1 is a device that is carried by a vehicle owner or the like and transmits a radio wave signal to the vehicle side receiving device. The case 5 of the radio wave transmitting device 1 is formed to have a size that can fit in the palm of the hand. The case 5 is made of synthetic resin, and has first, second, and third push buttons 61, 62, and 63 on the upper surface. The first, second, and third push buttons 61, 62, and 63 are push buttons that are operated when transmitting radio wave signals, and form a so-called rubber contact having an electrode (not shown) on the back surface. are doing.
In this embodiment, the first push button 61 is a door lock button that is operated to lock all the doors, and the second push button 62 is a driver's seat door unlock button that is operated to unlock only the driver's door. The third push button 63 is set as an all-seat door unlock button operated to unlock all doors.
[0009]
A substrate 3 is built in the case 5. The substrate 3 has counter electrodes 64, 65, 66 that bridge when the electrodes on the back surfaces of the first, second, and third push buttons 61, 62, 63 come into contact with each other, as shown in FIG. The oscillation circuit 2 having a circuit configuration as described above is mounted, and further includes a pattern antenna 4 electrically connected to the oscillation circuit 2 and a so-called button battery 7 for supplying power to the oscillation circuit 2. The circuit configuration of the oscillation circuit 2 will be described later.
[0010]
As shown in FIG. 1, the pattern antenna 4 has a curved shape, for example, a sawtooth shape connected in a substantially U shape. More specifically, each of the pattern antennas 4 is a first conductive pattern 41 having a fixed length, and the first conductive pattern 41 arranged in a row on the first surface 31 of the substrate 3 and each of the first conductive patterns 41 having a fixed length. A second conductive pattern 42 arranged in a row on the second surface 32 of the substrate 3, and ends of the second conductive pattern 42 and the first conductive pattern 41 passing through the substrate 3. And through holes 43 electrically connected. The sawtooth pattern antenna 4 is formed by the first conductive pattern 41, the second conductive pattern 42 and the through hole 43. The pattern antenna 4 shown in this embodiment has only a small inductance of about 10 to 100 nH (nanohenry), but is a value sufficient for transmitting a radio wave in the UHF band.
[0011]
Next, the circuit configuration of the oscillation circuit 2 will be described with reference to FIG. The oscillation circuit 2 includes a surface acoustic wave device 21 having a natural frequency of about 300 MHz, a high-frequency transistor 22 connected to the surface acoustic wave device 21 as a base, and an emitter of the transistor 22. A feedback resistor 23 connected to each other, capacitors 24 and 25 connected between the collector and emitter of the transistor 22 and both ends of the resistor 23, an encoder 26, and a resistor 27 connected between the encoder 26 and the base of the transistor 22, Connected with. The oscillation circuit 2 has a circuit configuration in which the Hartley oscillation circuit and the Colpitts oscillation circuit are combined, and the oscillation frequency component is converged around about 300 MHz by using the filter characteristic of the surface acoustic wave element 21. The circuit configuration can extract the oscillation signal. In FIG. 3, the surface acoustic wave element 21 is shown as an equivalent circuit comprising a resistor 21a, a coil 21b, and capacitors 21c and 21d. However, the actual element is an element in which interdigital electrodes are deposited on a crystal piece of a piezoelectric medium. is there.
[0012]
The encoder 26 derives a first coded pulse signal combining the ID code and the control code indicating the door lock control when the counter electrode 64 is bridged by pressing the first push button 61, and similarly When the counter electrode 65 is bridged by pressing the second push button 62, a second coded pulse signal combining the ID code and the control code indicating the driver door unlock control is derived. When the counter electrode 66 is bridged by pressing the push button 63, a third coded pulse signal is derived by combining the ID code and the control code indicating all seat door unlock control. So, a microcomputer is adopted.
[0013]
The coded pulse signal derived by the encoder 26 is repeated in the order and combination in which the high level pulse signal and the low level pulse signal are set in advance for each code while the push buttons 61, 62, 63 are pressed. One pulse length is set sufficiently longer than the period of the natural vibration of the surface acoustic wave element 21. When the high-level pulse signal is derived from the encoder 26, the surface acoustic wave element 21 vibrates at a frequency in the UHF band of about 300 MHz in cooperation with elements such as the transistor 22, the feedback resistor 23, and the capacitors 24 and 25. As a result, the oscillation circuit 2 forms a UHF band carrier wave in which the coded pulse signal derived from the encoder 26 is superimposed on the oscillation signal of about 300 MHz.
[0014]
In the oscillation circuit 2, the collector of the transistor 22 is connected to one end of the pattern antenna 4, the power supply end of the encoder 26 is connected to the battery 7 together with the other end of the pattern antenna 4, and the input end of the encoder 26 is opposed to each other. The electrodes 64, 65, and 66 are connected.
[0015]
Next, the operation of the above embodiment will be described.
For example, when the occupant gets out of the vehicle and uses the portable radio wave transmission device 1 to lock the door, the first push button 61 is pushed. Then, the counter electrode 64 bridges and a signal is input to the encoder 26, and the encoder 26 derives a first coded pulse signal in which the ID code and the control code indicating the door lock control are combined.
[0016]
As a result, the oscillation circuit 2 forms a UHF band carrier wave in which the first coded pulse signal derived by the encoder 26 is superimposed on the oscillation signal of about 300 MHz, and transmits it as a radio wave from the pattern antenna 4 to the vehicle side reception circuit. . This vehicle-side receiving circuit has a decoder (not shown), detects a coded pulse signal from the carrier wave, compares the coded pulse signal with data stored in advance in the decoder, and as a result When detecting that the coded signal is the first coded pulse signal, the vehicle-side receiving circuit controls the actuator to drive the door lock mechanisms of all seats of the vehicle to the lock side.
[0017]
Further, when the radio transmission device 1 carried by the occupant from outside the vehicle is used to unlock the door only for the driver's seat, the second push button 62 is pushed. Then, the counter electrode 65 bridges and a signal is input to the encoder 26, and the encoder 26 derives a second coded pulse signal that combines the ID code and the control code indicating the driver's door unlock control.
[0018]
As a result, the oscillation circuit 2 forms a UHF band carrier wave in which the second coded pulse signal derived from the encoder 26 is superimposed on the oscillation signal of about 300 MHz in the same manner as described above, and the vehicle-side reception circuit as a radio wave from the pattern antenna 4 Send to. When the vehicle-side receiving circuit detects that the detected coded pulse signal is the second coded pulse signal, the vehicle-side receiving circuit controls the actuator to drive the door lock mechanism only for the driver's seat of the vehicle to the unlock side.
[0019]
Further, when unlocking all the doors using the radio wave transmitter 1 carried by the passenger from outside the vehicle, the third push button 62 is pushed. Then, the counter electrode 66 bridges and a signal is input to the encoder 26, and the encoder 26 derives a third coded pulse signal in which the ID code and the control code indicating the all-seat door unlock control are combined.
[0020]
As a result, the oscillation circuit 2 forms a UHF band carrier wave in which the third coded pulse signal derived by the encoder 26 is superimposed on the oscillation signal of about 300 MHz similarly to the above, and the vehicle-side receiving circuit as a radio wave from the pattern antenna 4 Send to. When the vehicle side receiving circuit detects that the detected coded pulse signal is the third coded pulse signal, the vehicle side receiving circuit controls the actuator to drive the door lock mechanisms of all seats of the vehicle to the unlock side.
[0021]
As described above, the radio wave transmitting apparatus 1 transmits a UHF band radio wave on which a coded pulse signal is placed on the vehicle-side receiving circuit, but the shape of the pattern antenna 4 that emits the radio wave is continuous in a curved shape, for example, a substantially U shape. Since the sawtooth shape is formed, the directivity is lost, and the electric wave from the radio wave transmitting device 1 is transmitted with a substantially constant sensitivity in the vehicle side receiving circuit regardless of whether the radio wave transmitting device 1 is directed toward the vehicle side. Can be received.
[0022]
[Other examples]
The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the pattern antenna may be formed by connecting substantially sawtooth patterns in a curved shape, and may be connected in various forms as desired in addition to being connected in a substantially U shape. In the above-described embodiments, the shape of the pattern antenna is a sawtooth shape. However, the shape of the pattern antenna may be substantially a sawtooth shape, that is, a shape having a function equivalent to that of a sawtooth shape pattern antenna. Don't stick to it. For example, a sawtooth shape as shown in FIG. 4, a sine wave shape or a rectangular wave shape may be used.
[0023]
【The invention's effect】
Since the present invention has the above-described configuration and operation, in a radio wave transmitter for remotely controlling a load such as a door lock actuator mounted on a vehicle with radio waves, the directivity of the transmitted radio wave transmitted by the radio wave transmitter is reduced. Regardless of whether the attitude of the radio wave transmitter is directed toward the vehicle, the vehicle-side receiving circuit can receive radio waves from the radio wave transmitter with a substantially constant sensitivity, depending on the attitude of the radio wave transmitter. There is no problem that the vehicle-side receiving device does not receive outgoing radio waves.
In addition, even if the output of the radio wave transmitter is increased, there is no directivity, so there is no problem of deviating from the regulation value of the radio wave law when the electric field strength is measured in a specific direction. It can be maximized within the legal framework.
[Brief description of the drawings]
FIG. 1 is a perspective view of a substrate showing a preferred embodiment of the present invention.
FIG. 2 is a perspective view of a radio wave transmitting apparatus showing a preferred embodiment of the present invention.
FIG. 3 is an electric circuit diagram of an oscillation circuit and the like built in a radio wave transmission apparatus according to a preferred embodiment of the present invention.
FIG. 4 is a plan view showing another embodiment of the shape of the pattern antenna according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Radio wave transmitter 2 Oscillation circuit 3 Board | substrate 4 Pattern antenna 5 Case 61 1st push button 62 2nd push button 63 3rd push button 7 Battery

Claims (2)

A radio wave transmitting device (1) for transmitting a radio signal to a vehicle-side receiving device is electrically connected to a substrate (3) on which an oscillation circuit (2) is mounted, and the oscillation circuit (2) and a substrate ( 3) a substantially serrated pattern antenna (4) connected in a curved line on the substrate, and the pattern antenna (4) is a first conductive pattern (41) each having a fixed length and is a substrate (3) The first conductive pattern (41) arranged in a row on the first surface (31) of the first conductive pattern (41) and the second conductive pattern (42) each having a certain length, the second surface (32) of the substrate (3) The second conductive pattern (42) arranged in a row, and the through holes in which the ends of the second conductive pattern (42) and the first conductive pattern (41) are electrically connected through the substrate (3). These first conductive patterns (41), comprising holes (43), The substantially sawtooth by second conductive pattern (42) and the through hole (43)
An on- board load remote control radio wave transmission device in which the pattern antenna (4) is formed . In the invention of claim 1,
A radio wave transmitter for in-vehicle load remote control in which the substantially sawtooth pattern antenna (4) is connected in a substantially U shape.

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