JP2000114992A - Transmitter and receiver - Google Patents

Abstract

(57) [Abstract] [Problem] To improve the radiation characteristics of radio waves, and satisfy various requirements such as miniaturization, thinning, impact resistance, reduction in the number of parts and assembly steps, cost reduction, and reliability. Provide a transmitter capable of A transmitter includes a transmission unit mounted on a printed circuit board, and a transmission loop antenna connected to an output terminal of the transmission unit. The transmission loop antenna 3 is formed on the surface of the printed circuit board 1 and radiates a horizontally polarized wave or a vertically polarized wave. The second pattern antenna 32 radiates horizontally polarized waves or vertically polarized waves using through holes 321 and 322 provided in the thickness direction, and forms a loop as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter and a receiver which can be applied to a wireless remote control device used for operating various electronic devices from a remote place or for automatically opening / closing an automobile door. About.

[0002]

2. Description of the Related Art In recent years, remote control devices called radio key systems have been widely used in automobiles. This radio key system emits radio waves from a transmitter built in the grip part and key holder part of the ignition key, and receives the radio waves with the on-board receiver, so that the door lock and engine start even from a place away from the car And the like.

As an example of a transmitter used in such a radio key system, a transmitter described in Japanese Patent Application Laid-Open No. Hei 7-113365 is known.

This transmitter has a transmission antenna comprising a loop antenna. The transmission antenna is a printed pattern antenna formed by a printed pattern formed on the back surface of a printed circuit board, and is electrically connected to the antenna. It consists of a U-shaped plate antenna with a U-shaped cross-section in the length direction, enabling both vertically and horizontally polarized radio waves to be radiated, thereby reducing the effects of multipath on radio transmission. Things.

[0005]

In recent years, small wireless devices, especially portable transmitters used in the above-mentioned radio key system, can emit both vertically polarized and horizontally polarized radio waves. In addition, there are demands for miniaturization, thinning, impact resistance, reduction in the number of parts, reduction in the number of assembly steps, cost reduction, reliability, and the like.

However, the transmitter described in Japanese Patent Application Laid-Open No. 7-113365 can emit both vertically polarized waves and horizontally polarized waves as described above. Since it is necessary to electrically connect to the antenna, it is not possible to satisfy the above-described requirements such as reduction in the number of parts, reduction in the number of assembly steps, and reduction in cost.

Further, since the plate antenna is provided on the back side of the printed circuit board which is not the component side and protrudes in the thickness direction of the printed circuit board, the plate antenna becomes thicker by the plate antenna and is not suitable for thinning. It is.

The present invention has been made in view of the above points, and a first object of the present invention is to improve the radiation characteristics of radio waves, and to reduce the size, thickness, impact resistance, number of parts, and assembly. It is an object of the present invention to provide a transmitter that can satisfy various requirements such as reduction of man-hours, cost reduction, and reliability.

A second object of the present invention is to improve the reception performance of radio waves and to reduce the size, thickness, impact resistance, the number of parts, the number of assembly steps, the cost, and the reliability. It is an object of the present invention to provide a receiver that can satisfy each requirement such as the above.

[0010]

Means for Solving the Problems In order to solve the above problems and achieve the first object of the present invention, the inventions according to claims 1 to 3 are configured as follows.

That is, the invention according to claim 1 is a transmitter in which a transmitter body and a transmission loop antenna are respectively provided on a circuit board, wherein the transmission loop antenna is electrically conductive on one surface of the circuit board. A first antenna formed by a pattern, and a second antenna electrically connected to the first antenna and including at least a conductor penetrating the circuit board in a thickness direction. It becomes.

According to a second aspect of the present invention, in the transmitter according to the first aspect, the second antenna is connected to the conductor and the other of the circuit board and electrically connected to the conductor. And a conductive pattern formed on the surface.

According to a third aspect of the present invention, in the transmitter according to the first or second aspect, the circuit board is a double-sided printed board, and the conductor electrically connects the front and back of the double-sided printed board. It is a through hole to be connected.

Further, in order to achieve the second object of the present invention, each of the inventions according to claims 4 to 6 is configured as follows.

That is, according to a fourth aspect of the present invention, in the receiver in which the receiver body and the receiving loop antenna are provided on the circuit board, the receiving loop antenna is electrically conductive on one surface of the circuit board. A first antenna formed by a pattern, and a second antenna electrically connected to the first antenna and including at least a conductor penetrating the circuit board in a thickness direction. It becomes.

According to a fifth aspect of the present invention, in the receiver according to the fourth aspect, the second antenna is connected to the conductor and the other of the circuit board and electrically connected to the conductor. And a conductive pattern formed on the surface.

According to a sixth aspect of the present invention, in the receiver according to the fourth or fifth aspect, the circuit board is a double-sided printed board, and the conductor electrically connects the front and back of the double-sided printed board. It is a through hole to be connected.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the configuration of the first embodiment of the transmitter of the present invention.

In the first embodiment of the transmitter, as shown in FIG. 1, a transmission unit 2 mounted on the front side of a printed board 1 composed of a double-sided printed board, and formed on the front and back surfaces of the printed board 1 and the like. A transmission loop antenna 3 electrically connected to an output terminal of the transmission unit 2 is provided.

The transmitting unit 2 is configured such that an oscillator or a modulator using a SAW resonator, for example, is integrated or modularized to wirelessly transmit an information signal, and functions as a transmitter body. Note that the transmission unit 2 may be configured as individual components and mounted on the printed circuit board 1 without being unitized.

The transmitting loop antenna 3 is formed on the surface of the printed circuit board 1 and radiates a horizontally polarized wave or a vertically polarized wave, and is electrically connected to the first pattern antenna 31. And a second pattern antenna 32 formed by using a through hole provided in the thickness direction of the printed circuit board 1 and radiating a horizontally polarized wave or a vertically polarized wave, and forms a loop as a whole.

As shown in FIG. 1, the first pattern antenna 31 is composed of copper foil patterns 311 and 312 formed at predetermined intervals in the length direction on the surface of the printed circuit board 1. One end of each of 311 and 312 is connected to the output terminal of the transmission unit 2, and the other end of each through hole 32 electrically connects the front and back of the printed circuit board 1.
1, 322 are connected to respective ends.

As shown in FIG. 1, the second pattern antenna 32 is provided in the thickness direction of the printed circuit board 1 and has through holes 321 and 322 connecting the front and back thereof, and the other end of each of the through holes 321 and 322. Copper foil pattern 323 connected and formed on the back surface of printed circuit board 1
It is composed of

FIG. 2 shows only the transmitting loop antenna 3 of FIG. 1 taken out of the transmitter configured as described above.
It is.

Next, the first of the transmitters configured as above will be described.
The operation of the transmission loop antenna 3 in the embodiment will be described with reference to FIGS.

When the transmitter is used with the printed circuit board 1 in a horizontal state as shown in FIG. 1, the first pattern antenna 31 of the transmission loop antenna 3 radiates a horizontally polarized wave and the second Vertically polarized waves are radiated from the pattern antenna 32.

On the other hand, when the transmitter is used in a vertical state by rotating the printed circuit board 1 by 90 degrees about the length direction of the printed circuit board 1 from the state of FIG. 1, the transmission loop antenna 3 is also rotated by 90 degrees. State. In this case, of the transmission loop antenna 3, the first pattern antenna 31 radiates a vertically polarized wave, and the second pattern antenna 32 radiates a horizontally polarized wave.

As described above, in the first embodiment of the transmitter, the transmission loop antenna 3 is composed of the first pattern antenna 31 and the second pattern antenna 32, and the horizontal and vertical polarizations are formed by these two antennas. Since the waves are radiated simultaneously, the radiation characteristics of the radio waves can be improved.

Further, in the first embodiment of the transmitter, the second pattern antenna 32 is provided with through holes 321 and 322 formed in the thickness direction of the printed circuit board 1 and a copper foil pattern provided on the back surface of the printed circuit board 1. 323, the second pattern antenna 32 does not need to be handled as an independent component, and the second pattern antenna 32 does not protrude in the thickness direction of the printed circuit board 1. For this reason, the transmitter is smaller, thinner, shock resistant,
The number of parts, the number of assembly steps, the cost, and the reliability can be reduced.

Next, a second embodiment of the transmitter according to the present invention will be described with reference to FIGS.

In the second embodiment of the transmitter, the transmission loop antenna 3 of FIG. 1 is replaced by a transmission loop antenna 4 as shown in FIG. 3, and the other parts are the same as those of FIG. Therefore, the configuration of the same part is omitted in FIG.

As shown in FIG. 3, the transmission loop antenna 4 includes a first pattern antenna 41 and a first pattern antenna 41, as shown in FIG. It is composed of a two pattern antenna 42 and a third pattern antenna 43,
A loop is formed as a whole.

Here, the first pattern antenna 41 and the second
The pattern antenna 43 corresponds to the second pattern antenna 32 in FIG. 1, and the second pattern antenna 42 corresponds to the first pattern antenna in FIG.
This corresponds to the pattern antenna 31.

As shown in FIG. 3, the first pattern antenna 41 includes copper foil patterns 411 and 412 formed on the surface of the printed circuit board 1, and the copper foil patterns 411 and 41.
2, and one end of each of the copper foil patterns 411 and 412 is connected to an output terminal of a transmission unit (not shown).

As shown in FIG. 3, the second pattern antenna 42 comprises copper foil patterns 421 and 422 formed on the back surface of the printed circuit board 1 at predetermined intervals in the longitudinal direction. One ends of 421 and 422 are connected to the through holes 413 and 414, and the other ends thereof are connected to one ends of the through holes 431 and 432.

As shown in FIG. 3, the third pattern antenna 43 is connected to the through holes 431 and 432, and is connected to the other ends of the through holes 431 and 432 and is formed on the surface of the printed circuit board 1 on the front side. And a foil pattern 433.

FIG. 4 shows only the transmitting loop antenna 4 of FIG. 3 taken out of the transmitter configured as described above.
It is.

In the transmission loop antenna 4 according to the second embodiment of the transmitter having such a configuration, the first pattern antenna 41 and the third pattern antenna 43 are the same as those in the second embodiment shown in FIG.
Since it corresponds to the pattern antenna 32 and its effective portion becomes large, the radiation characteristics of radio waves are further improved as compared with the transmission loop antenna 3 of FIG.

Next, a third embodiment of the transmitter according to the present invention will be described with reference to FIG.

In the third embodiment of the transmitter, the transmission loop antenna 4 of FIG. 3 is replaced by a transmission loop antenna 4A as shown in FIG. 5, and the other parts are the same as those of FIG. Therefore, the configuration of the same part is omitted in FIG.

That is, the transmission loop antenna 4A is
In order to increase the opening area of each of the first pattern antenna 41 and the third pattern antenna 43 in the transmission loop antenna 4 of FIG. 3, the printed circuit board 1A shown in FIG. 413A, 414A, 431A, 43
The length of 2A is increased.

In the transmission loop antenna 4A of the third embodiment of the transmitter having such a configuration, the opening areas of the first pattern antenna 41 and the third pattern antenna 43 are made closer to the opening area of the second loop antenna 42. Therefore, the radio wave radiation characteristics are further improved as compared with the transmission loop antenna 4 of FIG.

Next, an embodiment of the receiver according to the present invention will be described with reference to FIG.

As shown in FIG. 6, this embodiment of the receiver includes a receiving unit 2 mounted on the front side of a printed board 7 made of a double-sided printed board, and a receiving unit formed on the front and back surfaces of the printed board 1. And a receiving loop antenna 9 electrically connected to the input terminal 8.

The receiving unit 8 has an integrated oscillator or demodulator for extracting received data from the received signal of the receiving loop antenna 9 or functions as a receiver body. The receiving unit 8
May be configured from individual components without being unitized and mounted on the printed circuit board 7.

The receiving loop antenna 9 is connected to the printed circuit board 7
A first pattern antenna 91 formed on the surface of the substrate and receiving horizontal or vertical polarization, electrically connected to the first pattern antenna 91, and
And a second pattern antenna 92 formed by using a through hole provided in the thickness direction of the second pattern antenna to receive a horizontally polarized wave or a vertically polarized wave, thereby forming a loop as a whole.

As shown in FIG. 6, the first pattern antenna 91 comprises copper foil patterns 911 and 912 formed on the surface of the printed circuit board 7 at predetermined intervals in the length direction. One end of each of 911 and 912 is connected to the input terminal of the receiving unit 8, and the other end of each of the through holes 92 electrically connects the front and back of the printed circuit board 7.
1, 922 is connected to each end.

As shown in FIG. 6, the second pattern antenna 92 is connected to the through holes 921 and 922 connecting the front and back of the printed circuit board 7, and connected to the other ends of the through holes 921 and 922. And a copper foil pattern 923 formed on the back surface of the substrate.

Next, the operation of the receiving loop antenna 9 in the embodiment of the receiver configured as described above will be described.
This will be described with reference to FIG.

When the receiver is used with the printed circuit board 7 in a horizontal state as shown in FIG. 6, the first pattern antenna 91 of the receiving loop antenna 9 receives the horizontally polarized wave and the second The antenna 92 receives the vertically polarized wave.

On the other hand, when the receiver is used in a vertical state by rotating the receiver 90 degrees about the longitudinal direction of the printed circuit board 7 from the state of FIG. 6, the receiving loop antenna 9 is also rotated 90 degrees. State. In this case, the first pattern antenna 91 of the receiving loop antenna 9 receives the vertically polarized wave, and the second pattern antenna 92 receives the horizontally polarized wave.

As described above, in the embodiment of the receiver, the receiving loop antenna 9 is connected to the first pattern antenna 9.
Since the antenna is composed of the first and second pattern antennas 92 and both antennas receive the horizontally polarized wave and the vertically polarized wave at the same time, the radio wave receiving characteristics can be improved.

Further, in this embodiment of the receiver, the second pattern antenna 92 is provided with through holes 921 and 922 formed in the thickness direction of the printed circuit board 7 and a copper foil pattern 923 formed on the back surface of the printed circuit board 7. Therefore, it is not necessary to handle the second pattern antenna 92 as an independent component, and the second pattern antenna 92 does not protrude in the thickness direction of the printed circuit board 7. For this reason, receivers can be made smaller, thinner,
The number of parts, the number of assembly steps, the cost, and the reliability can be reduced.

In the receiver of the present invention, it is needless to say that the transmission loop antenna 4 shown in FIG. 3 or the transmission loop antenna 4A shown in FIG. Has already been described, and a description thereof will be omitted.

In the above description, the printed circuit board 1 or the printed circuit board 7 is a double-sided printed circuit board. However, for example, when it is necessary to increase the mounting density, a three-layer printed circuit board is used instead of the double-sided printed circuit board. A multi-layer substrate such as a plate may be used.

[0057]

As described above, in the transmitter according to the present invention, the transmitting loop antenna is formed by connecting the first antenna formed by the conductive pattern on one surface of the circuit board to the thickness direction of the circuit board. Since the antenna is constituted by the second antenna used, both the horizontal polarization and the vertical polarization can be radiated, whereby the radiation characteristics of radio waves can be improved, and the thickness can be reduced.

In the transmitter of the present invention, when the circuit board is a double-sided printed board and the second antenna is constituted by a through hole for electrically connecting the front and back of the board, the second antenna is independent. There is no need to handle the second antenna as a component, and the second antenna does not protrude in the thickness direction of the printed circuit board. Therefore, in the transmitter of the present invention, the radiation characteristics of radio waves can be improved, and the transmitter can be reduced in size, thickness, impact resistance, number of parts, assembly time, cost, and reliability. Can be realized.

In the receiver according to the present invention, the receiving loop antenna is composed of the first antenna formed by the conductive pattern on one surface of the circuit board and the second antenna utilizing the thickness direction of the circuit board. With this configuration, both horizontal polarization and vertical polarization can be received, so that the radio wave reception characteristics can be improved and the thickness can be reduced.

Further, in the receiver according to the present invention, when the circuit board is a double-sided printed board and the second antenna is constituted by a through hole for electrically connecting the front and back of the board, the second antenna is independent. There is no need to handle the second antenna as a component, and the second antenna does not protrude in the thickness direction of the printed circuit board. For this reason, in the receiver of the present invention, the radio wave receiving characteristics can be improved, and the receiver can be reduced in size,
It is possible to realize a reduction in thickness, impact resistance, a reduction in the number of parts, a reduction in the number of assembly steps, a reduction in cost, and an improvement in reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a first embodiment of a transmitter of the present invention.

FIG. 2 is a perspective view showing only a transmission loop antenna of FIG. 1;

FIG. 3 is a perspective view illustrating a configuration of a main part of a transmitter according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing only a transmission loop antenna of FIG. 3;

FIG. 5 is a perspective view showing a configuration of a main part of a third embodiment of the transmitter of the present invention.

FIG. 6 is a perspective view showing an overall configuration of a receiver according to an embodiment of the present invention.

[Explanation of symbols]

 1, 7 Printed circuit board 2 Transmission unit 3, 4, 4A Loop antenna for transmission 8 Receiving unit 9 Loop antenna for reception 31 First pattern antenna 32 Second pattern antenna 311, 312 Copper foil pattern 321, 322 Through hole 323 Copper foil pattern 91 first pattern antenna 92 second pattern antenna 911, 912 copper foil pattern 921, 922 through hole 923 copper foil pattern

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E250 AA21 BB38 CC20 HH01 JJ03 LL01 5K016 AA09 BA07 CA03 GA02 5K048 AA00 AA03 AA06 BA42 BA52 DB01 DC01 HA04 HA06 HA11 5K060 BB00 CC05 DD08 JJ21 5K064 BB00 DC01

Claims (6)

[Claims] 1. A transmitter in which a transmitter body and a transmission loop antenna are provided on a circuit board, respectively, wherein the transmission loop antenna is a first antenna formed by a conductive pattern on one surface of the circuit board. And a second antenna electrically connected to the first antenna and including at least a conductor penetrating the circuit board in a thickness direction. 2. The antenna according to claim 2, wherein the second antenna comprises:
The transmitter according to claim 1, further comprising a conductive pattern electrically connected to the conductor and formed on the other surface of the circuit board. 3. The circuit according to claim 1, wherein the circuit board is a double-sided printed circuit board, and the conductor is a through hole that electrically connects the front and back of the double-sided printed circuit board. Transmitter. 4. A receiver in which a receiver main body and a receiving loop antenna are provided on a circuit board, respectively, wherein the receiving loop antenna is a first antenna formed by a conductive pattern on one surface of the circuit board. And a second antenna electrically connected to the first antenna and including at least a conductor penetrating the circuit board in a thickness direction. 5. The antenna according to claim 5, wherein the second antenna includes:
The receiver according to claim 4, further comprising a conductive pattern electrically connected to the conductor and formed on the other surface of the circuit board. 6. The printed circuit board according to claim 4, wherein the circuit board is a double-sided printed board, and the conductor is a through hole that electrically connects the front and back of the double-sided printed board. Receiving machine.