JPH0329088A - Wireless transmission module for security sensor - Google Patents

Abstract

PURPOSE:To easily use a security sensor instead of a wireless transmitter by unifying a transmission control part, a high frequency oscillating/multiplying circuit, a high frequency amplifying/modulating circuit, and antennas. CONSTITUTION:A transmission control part 1, a high frequency oscillating/ multiplying circuit 3, a high frequency amplifying/modulating circuit 4 which modulates and amplifies a carrier wave to output a radio signal, and antennas ANT1 and ANT2 are unified. Power is supplied to the internal circuit of a wireless transmission module A through a pair of power terminals TV and TG of the module A; and when the security sensor is operated and a detection signal is inputted to a detection terminal TS, this detection signal is applied to a CPU 1a of the transmission control part 1 to output a modulation signal corresponding to the detection signal. Meanwhile, the carrier wave of the radio signal oscillated and outputted from the high frequency oscillating/multiplying circuit 3 is sent to the high frequency amplifying/modulating circuit 4 and is amplified and is modulated with the modulation signal outputted from the CPU 1a and is outputted as the radio signal. Thus, the radio signal is radiated from antennas ANT1 and ANT2 to a wireless receiver when the security sensor is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless transmission module incorporated in a security sensor when the security sensor is used as a wireless sensor. [Conventional techniques] Recently, many sensors such as heat ray sensors, temperature sensors, and gas sensors have been released and are widely used for crime prevention and other purposes. Among these sensors, for example, a heat ray sensor using a pigeon element that detects heat rays emitted from the human body can detect an intruder by installing it close to a door or window, and sound an alarm. It is often used as a security sensor that can cause However, since such security sensors are installed in the entrance hall and windows of each room in a residential unit, the detection signal from the security sensor is transmitted to a separate security receiver for centralized monitoring. In many cases, a lot of wiring must be laid from a large number of security sensors to a security receiver, making the construction work on a large scale. In order to solve this workability problem, the detection signal of each security sensor is converted into a wireless signal such as Radio Wave No. 18 and output, and this wireless signal is transmitted to a wireless receiver to demodulate the detection signal. Wireless security sensors such as these are being released from time to time, and since there is no need to install wiring between the wireless receiver and the wireless receiver, wireless security sensors can be easily installed. A security system can be installed. However, conventionally, this type of wireless security sensor has often configured the security sensor and wireless transmitter separately, and connected the various security sensors to a common wireless transmitter by replacing them. Although it is possible to easily create a wireless security sensor by simply reading a wireless transmitter onto a variety of security sensors, it is necessary to install a security sensor and a wireless transmitter at each location, which is time-consuming. Not only did it cost a lot of money, but it also looked bad. On the other hand, with a structure in which a security sensor is integrated with a built-in wireless transmitter, manufacturing costs are high because a wireless transmitter with a different shape must be installed for each different security sensor. [Problems to be Solved by the Invention] The present invention, proposed in view of the above circumstances, aims to provide a wireless transmission module that can be incorporated into a security sensor so that the security sensor can be used as a wireless sensor. [Means for Solving the Problems] The present invention proposed to achieve the above object includes a set of electric R terminals that receive power supply for internal circuits, and a detection terminal that manually receives detection signals from a security sensor. a wireless transmission module configured to convert a detection signal received from the security sensor into a radio wave signal and output it, the wireless transmission module receiving the detection signal from the security sensor and outputting a corresponding modulated signal. C
A transmission system*g including a PU, a high frequency oscillation/multiplier circuit that outputs a carrier wave of a radio signal, and a high frequency amplification/modulation circuit that receives the modulation signal, modulates and amplifies the carrier wave, and outputs a radio signal. , the above radio signal into space! ! It has a configuration that integrates the antenna that emits the light. Further, the wireless transmission module proposed in claim 2 as another embodiment of the present invention has two antennas arranged at right angles to each other, and these antennas are operated by a switching signal from a transmission control section. It is a polarization diversity antenna that is switched alternately. Furthermore, another aspect of the present invention proposed in claim 3 is that the three terminals are connected to a connecting part provided corresponding to the circuit board on the security sensor side, and the power supply to the R terminal of the IM is controlled by the security sensor. The configuration is such that the power supply line is configured by forming a conductive pattern on the circuit board on the sensor side.Furthermore, in order to prevent high frequency signals from going around to the transmitting circuit section of the wireless transmitting module, a conductive pattern is formed on the circuit board on the sensor side. The configuration is such that a jumper wire is spanned between the power supply line of the sensor or the power supply line on the circuit board on the security sensor side, and a ferrite bead is inserted into this jumper wire. [Function] In the present invention as set forth in claim 1, when power is supplied to the internal circuit of the wireless transmission module through its l sets of power supply terminals, and the security sensor is activated and a detection signal is input to the detection terminal, This detection signal is applied to the CPU of the transmission control section, which outputs a modulated signal corresponding to the detection signal. On the other hand, the carrier wave of the radio wave signal oscillated and output from the high frequency oscillation/multiplier circuit is sent to the high frequency amplification/modulation circuit, where it is amplified, modulated by adding a modulation signal output from the CPU, and output as a radio wave signal. Ru.

As a result, when the security sensor is activated, the antenna beams a radio signal toward the wireless receiver. In the present invention as set forth in claim 2, the two antennas are disposed at right angles to each other and high frequency signals are alternately supplied to these antennas to constitute a polarization diversity antenna. Radio signals with orthogonal wavefronts can be radiated alternately, which improves reception reliability. In addition, in the present invention described in claim 3, the power line is connected by a ferrite bead inserted into a jumper wire provided in the middle of the power line on the transmission IS module or the power line on the circuit board on the security sensor side. A high impedance is provided to the high frequency signal in the k part, and a ferrite bead is provided to prevent the high frequency signal from passing through the k part, so that the power line is cut off at high frequency by the trapping action of the ferrite bead. [Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a wireless transmission module A of the present invention, in which (a) shows a front view of the front side thereof, and (b) shows a front view of the back side thereof. As shown in the figure, this wireless transmission module A is
Internal circuit members are attached to both the front and back sides of one printed circuit board PB, and the front side is equipped with a circuit board C that constitutes the transmission control section l.
P WJ 1 a is implemented, and the control I described later is implemented on the back side.
DIP switches 1b to 1d for making l settings, and 2
two antennas ANTI. ANT2 is implemented. Furthermore, in the center of the printed circuit board PB, there are provided R terminals TV and TO of llA that receive power supply from the outside, and a detection terminal TS that inputs the detection signal from the security sensor. In the embodiment, the two antennas ANTI and ANT2 are arranged orthogonally to each other, and an antenna switching signal is applied from CP (Jla) to each of them, forming a polarization diversity antenna that alternately radiates radio signals. The present invention is not limited to such a polarization diversity antenna configuration. Fig. 2 is a block diagram showing the internal circuit configuration of the wireless transmission module A. In the high frequency oscillation/multiplication #J3, the carrier wave of the radio signal is output, and the high frequency amplification/modulation circuit 4 receives the modulation signal sent from the control IjIfI11 and performs high frequency oscillation/multiplication. 1
It is said that the configuration is such that a carrier wave transmitted from s3 is modulated and amplified to output a radio signal, and the radio signal transmitted from the high frequency amplification/modulation circuit 4 is sent to two antennas ANTI and ANT2 by a switching signal from the CPU 1a. The configuration is such that power is supplied to the station and traffic is generated. 1e is an ID that sets a unique ID code for wireless transmission module A.
This is a code setting means, and when radio signals from a plurality of wireless transmitting modules A are to be received by the wireless receiver, the wireless transmitting module A is identified by this ID code. In the configuration on the implementation side, even when power is supplied, by providing the energization control circuit 2, the energization control signal is output from the CPIJ 1d only when a detection signal is input to the detection terminal TS, and the high frequency Power is saved by supplying power to the oscillation/multiplier circuit 3 and the high-frequency amplification/modulation circuit 4, but when the t source is supplied, the high-frequency oscillation/multiplier circuit 3 is activated to generate the carrier wave. A configuration may also be used in which the radio wave signal of only the antenna ATNI,2 is radiated from the antenna ATNI,2. Note that the dip switch 1b. provided on the CPU 1a of the transmission system mis. 1c is a tone selection switch, and the data transmitted by the radio signal output when the detection signal is input is transferred to this tone selection switch lkl+.
By switching settings in four ways depending on the combination of lc, the ringing sound at the wireless receiver (not shown) Ill that receives the high frequency signal is switched to voloron, bibli, buru-buru, ping-pong, etc. In addition, dip switch] d is a test switch,
While this switch is set to the ON example, the security sensor will be in the same state as if it had been input, even if no word has been input.
High frequency signal from NTI,2! Since the wireless transmitter module A is output continuously, it is easy to perform a sensitivity adjustment test with the wireless receiver when the security sensor is installed in the morning. This test switch ld is normally set to off. In the wireless transmission module A having such a configuration, when a detection signal from a security sensor (not shown) is applied to the detection terminal TS, the power supply control circuit ga2 is activated from the CPU 1a.
An energization control signal is output to energize the high frequency oscillation/multiplier circuit 3 and the high frequency amplification/modulation circuit 4. On the other hand, the CPU 1a outputs a modulated signal containing the data set by the ID code setting means 1e and the timbre changeover switch It)+Ic to the high frequency amplification/modulation circuit 4, so that the carrier wave is converted into a true signal. Therefore, it is modulated and transmitted as a radio signal to antenna ANT1.2. To these antennas 1 and 2, switching signals of rHJ level and rLJ level are applied alternately from CPIJ1a,
At "L" level, a high frequency signal is radiated from the antenna, but when "H" level is added, the resonant frequency of the antenna is changed to stop the high frequency signal u84.
High frequency signals are alternately radiated from antenna ANTI,2. In other words, as a polarization diversity antenna,
It is configured to output a high frequency signal to a wireless receiver (not shown). According to the transmission module A having such a structure, the connector provided on the circuit board on the security sensor side, etc.
By connecting the three terminals TV, TS, and TG,
Can be used as a wireless transmitter for mi security sensor. Next, FIG. 3 is an explanatory diagram of the polarization diversity antenna used in the module of the present invention. Normally, when the receiving antenna is fixed in either vertical I1 polarization or horizontal polarization, the received electric field strength will decrease if the polarization plane on the transmitting antenna side and the polarization plane on the receiving antenna side are not matched (Principle Technically speaking, if the polarization planes are orthogonal, reception will not occur, but in reality, even vertically polarized antennas have horizontal polarization components, and the polarization plane is rotated by surrounding objects, so the received electric field strength has only declined). Therefore, it is necessary to install the transmitting antenna according to the installation situation of the receiving antenna, so the mounting direction is restricted, and if the polarization planes do not match, the received electric field strength will decrease. However, in a polarization diversity antenna, the transmitting Il
Since two antennas with orthogonal polarization planes (or on the receiving side) are alternately switched to output high-frequency signals with different width wavefronts, the influence of received electric field strength can be reduced even if the mounting direction changes. The wireless transmission module A of the present invention has two U-shaped antennas arranged orthogonally to each other on the printed circuit board PB (in the wooden embodiment, the U-shaped antenna and the copper foil surface of the printed circuit board are connected to each other). (In this example, the radiation is stopped alternately.), and if the printed circuit board PB is fixed directly to the ground, Then, a horizontally polarized high frequency signal is output from the antenna ANTI,
A high frequency signal with vertical II polarization is output from the antenna ANT2, and it is possible to stabilize the received electric field strength at the wireless reception Im (not shown>S) regardless of the installation status of the wireless transmission module A. Figure 14 is an exploded perspective view showing an example of a security sensor S (in this example, a heat ray sensor) in which the wireless transmission module 8 of the present invention is incorporated. This security sensor S is made of plastic. Copper plate 12.1 is placed on the Il1 side of the upper and lower covers 10 and II.
3 is attached, and the lower cover 11 has a main board 14 equipped with internal circuits of the security sensor, etc., a board 15 that supports the battery inserted between the upper cover 10, and the main board 14. A sub-board 16 that connects with the board 15 is mounted and fixed, and a wireless transmission module A is connected to a set of electric SBS terminals T at the side end of the main board 140.
v,'rc and the detection terminal TS are inserted and fixed into the connector 14a of the main board 14. Also, top cover 1
0 rib 10a is provided with battery fittings 10b, 10c, and the Confucian plate 12 is provided with battery fittings 12a, 12
The configuration is such that 311 batteries are connected in series, and the positive terminals of the 3 batteries connected in series are connected to the main board 1 via the lead wire l connected to the battery fitting 10a.
On the other hand, on the negative electrode side, when the side plate l2 is attached to the upper and lower covers 10, 1l, the battery fitting 12a and the spring 15a attached to the board l5 are brought into contact with each other, and the board 16
is connected to the main board 14 by a lead wire (not shown) to supply power to the main board 14. A pyroelectric element 10d, which is a heat ray sensor, is attached to the upper cover 10 and outputs a detection signal to the main group [14]. Therefore, with this security sensor S, it is possible to immediately create a wireless security sensor by simply attaching the wireless transmission module A to the connector 14&, and various security sensors can be easily connected by having the same structure. It can be made wireless.゜ Figure @5 is an explanatory diagram of the present invention according to claim 3, and corresponds to the explanation of Figure $4 mentioned above, and the same reference numerals are given to the portion 78.
The gist of the present invention is that the power supply line (positive voltage line and ground line) and the detection signal line to the wireless transmission module A are all connected via printed wiring on the main board 14. By inserting ferrite beads into jumper wires that are stretched across the
This is intended to improve the radiation efficiency of the antenna of the wireless transmission module A by actively utilizing the property that high frequency signals easily leak into power lines including ground lines.

In the figure, three batteries BT are connected in series, the positive 81 steel is connected to the round 14b of the main board 14 via the lead wire 1l connected to the battery metal fitting 10b, and the negative electrode side is connected to the battery metal fitting 12a. and is connected to the round l4c of the main board 14 via a spring 115a fixedly attached to the board l5 and a lead 812. The negative electrode side is wired from the round 14c to the bin corresponding to the terminal TG of the connector +4a via the ground line P5 of the main board 14, while the positive electrode side round 14b is wired to the main board 14 via the printed wiring aP1. Frontage 14
d, and is connected to the positive voltage line P2 of the main board 14 via the printed wiring & IP4 of the sub board l6, the jumper wire 16a, and the printed wiring P3, and this positive voltage line P4 corresponds to the power terminal TV of the connector +4a. It is connected to the bin. A jumper wire 16a provided on the sub-board 16 is connected to a ferrite bead F.
The configuration is such that two B are attached, and the sub-board l6 is located between the main board 14 and the board 15 in frontages 14d and 1.
5b, and the thin copper side of the printed circuit board is soldered. In such a configuration, a part of the high frequency signal stripped from the wireless transmitter module 8 leaks to the positive voltage line P4 and the ground line P6, and the high frequency signal leaked to the positive voltage line P4@11 is caused by the ferrite of the sub-board. Bead FB will prevent one leak. Therefore, depending on the frequency of the radio wave signal and the pattern design of the wireless transmission module A, the ferrite bead FB can be installed at a position where the maximum g radiation efficiency can be obtained from the antenna, thereby increasing the efficiency of the radio signal! wireless transmission module A and main board 1.
4 are all printed wiring, so there is no change in stray capacity as would be the case when connecting with lead wires, so if you manage the transmission output of wireless transmission module A, it will be possible to prevent interference from the security sensor. It is also possible to make the transmission output stable. In this embodiment, the ferrite beads FB are not provided because there is little leakage of high frequency waves on the ground line side, but the configuration is not limited to this, and the ferrite beads FB are provided on the ground line and the detection signal line to reduce radiation It is also possible to improve efficiency. [Effects of the Invention] According to the present invention proposed in claim 1, by forming the wireless transmission circuit section including the antenna into a three-terminal wireless transmission module, it can be easily incorporated into various types of security sensors. , security sensors can be easily turned into wireless transmitters. According to the present invention proposed in claim 2,
By using a polarization diversity antenna,
Stable reception can be achieved regardless of the installation status, further improving the reliability of the wireless transmission module. Further, according to the present invention proposed in claim 3, by providing ferrite beads in the conductive pattern, it is possible to improve the efficiency of radio signal transmission by the wireless transmission module, and further improve reliability.

[Brief explanation of drawings]

11th! I is a front view of the front and back sides of the wireless transmission module of the present invention, and the second (!I is a block configuration diagram thereof,
Figure 3 is an explanatory diagram of a polarization diversity antenna, lE
FIG. 4 is an exploded perspective view showing the configuration of a security sensor in which the wireless transmission module of the present invention is incorporated, and FIG. 5 is an exploded perspective view illustrating the operation when ferrite beads are attached. [Explanation of symbols] TV, TG...Power terminal TS...Detection terminal A...Wireless transmission module]a・◆・CPU 1...Transmission control section 3...High frequency oscillation/multiplier circuit 4・...High frequency amplification/modulation circuit ANTI. ANT2・●・Antenna 14a...Connection g (connector) P4, P5...Power line (positive voltage line, ground line) lea...Jumper wire FB・●・Ferrite bead connection

Claims (3)

[Claims] (1) It has one set of power terminals that receive power supply for the internal circuit and a detection terminal that inputs the detection signal from the security sensor, and converts the detection signal received from the security sensor into a radio wave signal and outputs it. The wireless transmission module is configured to include a transmission control section including a CPU that outputs a corresponding modulation signal when receiving a detection signal from a security sensor, and a high-frequency oscillation module that outputs a carrier wave of a radio signal. A security system that integrates a multiplier circuit, a high-frequency amplification/modulation circuit that receives the modulated signal, modulates and amplifies the carrier wave, and outputs a radio signal, and an antenna that radiates the radio signal into space. Wireless transmission module for sensors. (2) The antenna is composed of two antennas arranged at right angles to each other, and the radio signal is supplied alternately to these two antennas by a switching signal from the transmission control section. The wireless transmission module for a security sensor according to claim 1, characterized in that it constitutes a city antenna. (3) The wireless transmission module for the security sensor has a configuration in which the three terminals are connected to a connection section provided corresponding to the circuit board on the security sensor side, and power is supplied to the one set of power terminals. This is done through a power line constructed by forming a conductive pattern on the circuit board on the security sensor side.
Claim 1, further comprising: a jumper wire stretched between the power supply line on the transmission module or the power supply line on the circuit board on the security sensor side, and a ferrite bead inserted into the jumper wire.
Wireless transmission module for security sensors described in .