JP2007233626A - Wireless sensor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thinned wireless sensor device capable of significantly reducing or eliminating the frequency of battery change. <P>SOLUTION: A main housing A includes a glass breakage detection part 2 detecting vibration of a glass plate of a window body to detect breakage of the glass plate; an opening and closing detection part 2B detecting opening and closing of the window body; a glass breakage processing circuit 3A processing a detection signal of the glass breakage detection part 2A; an opening and closing processing circuit 3B processing a detection signal of the opening and closing detection part 2B; a radio transmitting circuit 4 including a super-wide band radio transmitting circuit transmitting a radio signal according the state of the detection signals processed by both the processing circuits 3A and 3B; and a power supply part 5 including a primary battery 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  An object of the present invention is to provide a wireless sensor device that transmits a radio wave signal according to the state of a detection signal from a detection unit.

There has been conventionally provided a glass breakage detector for detecting breakage of a window glass by a detection unit and transmitting a radio signal corresponding to the detected state (for example, Patent Document 1).
JP-A-2005-78500 (paragraph numbers 0015 to 0017, FIG. 1)

  The glass breakage detector disclosed in the above-mentioned Patent Document 1 uses a primary battery as a power source. As this primary battery, a cylindrical large-capacity detector is adopted in order to reduce the labor for battery replacement. ing. Therefore, the thickness of the main body housing of the glass breakage detector is increased, and there is a possibility that the window body and the main body housing interfere with each other when the window body is opened and closed. Therefore, in order to avoid interference between the window body and the main body housing, there are cases where restrictions are placed on the position of the glass breakage detector and measures are taken such as installing a stopper on the window body to protect the glass breakage detector. there were.

  On the other hand, in order to avoid interference when opening and closing the window body, some button-type primary batteries are used as the power source to reduce the thickness of the main body housing. In this case, however, ensure sufficient battery capacity. Therefore, it was necessary to replace the battery frequently.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a wireless sensor device which can be thinned and can greatly reduce or eliminate the frequency of battery replacement. .

  In order to achieve the above object, according to the first aspect of the present invention, a detection unit that detects a state of an opening of a building, a processing circuit that processes a detection signal of the detection unit, and a detection that is processed by the processing circuit A wireless transmission circuit that transmits a radio signal according to a signal state; a processing circuit including the detection unit; and a primary battery that supplies operating power to the wireless transmission circuit; It is characterized by comprising a transmission circuit.

  According to the first aspect of the present invention, since the radio transmission circuit is an ultra-wideband radio transmission circuit, the power consumption in the radio transmission circuit can be greatly reduced, and as a result, the primary battery used as the power supply unit has a small capacity and A thin one can be employed, so that the main body housing can be thinned, and the frequency of battery replacement can be greatly reduced.

  In the invention of claim 2, the detection unit for detecting the state of the opening of the building, the processing circuit for processing the detection signal of the detection unit, and the radio signal according to the state of the detection signal processed by the processing circuit A power source for supplying power for operation to the processing circuit including the detection unit and the wireless transmission circuit, comprising a wireless transmission circuit for transmission, a solar cell and a power storage element that is charged with the generated energy of the solar cell. And a main body housing joined so that the light receiving surface of the solar cell is exposed to the surface.

  According to the second aspect of the present invention, since the power source unit is configured by the solar cell and the power storage element charged by the generated energy of the solar cell, battery replacement becomes unnecessary, and the light receiving surface of the solar cell is exposed on the surface of the cover. Thus, the light is directly applied to the light receiving surface of the solar cell, and power can be generated efficiently. As a result, a small-capacity power storage element can be used, and the main body housing can be thinned.

  According to a third aspect of the invention, in the second aspect of the invention, the wireless transmission circuit is constituted by an ultra-wideband wireless transmission circuit.

  According to the invention of claim 3, since the wireless transmission circuit is an ultra-wideband wireless transmission circuit, power consumption in the wireless transmission circuit can be greatly reduced, and as a result, it is required for power generation of the solar cell of the power supply unit. It can be installed in a place where the average illuminance is low because the amount of light to be generated is small, and restrictions on the installation place can be reduced. Furthermore, when the restrictions on the mounting location are the same, the area of the light receiving portion of the solar cell can be reduced. Therefore, the main housing can be further reduced in size by reducing the area of the cover to which the solar cell is joined.

  According to a fourth aspect of the present invention, in the second or third aspect of the invention, the surface of the main body housing to which the solar cell is joined is a surface opposite to the surface to be attached to the glass plate of the fitting provided in the opening. It is characterized by being.

  According to the invention of claim 4, the light receiving surface of the solar cell can be installed in the indoor direction by mounting the main body housing on a glass plate of a fitting such as a window body. Power can be generated by using light guide effectively, and there is no risk of operation stop due to insufficient light generation due to light blocking by shutters, etc., as in the case of directing outside, and solar cell reception due to dirt on the glass plate. The amount of light received by the solar cell can be stabilized without a decrease in the amount of light incident on the surface.

  According to a fifth aspect of the present invention, in any one of the second to fourth aspects of the present invention, a joint portion between the solar cell and the main body housing has a waterproof structure.

  According to the invention of claim 5, since it is not necessary to replace the battery by the power source unit composed of the solar battery and the storage battery, it is not necessary to provide an opening / closing part and a removing part for battery replacement in the main body housing. By making the joint portion with the main body housing waterproof, the entire device can be easily waterproofed at low cost, and as a result, it can be installed even in a humid environment such as a bathroom.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the detection unit is constituted by at least one of a reed switch that opens and closes according to a distance from a piezoelectric ceramic or a magnet that detects vibration caused by an acoustic mission. It is configured.

  According to invention of Claim 6, the wireless sensor apparatus which can detect the destruction of the glass plate of a window or the opening of a door, a door, etc., and can transmit the detection information with a radio signal is provided. Can do.

  The present invention provides a wireless sensor device in which a main body housing can be thinned by using a power supply unit that can be thinned with a small capacity of the main body housing, and the frequency of battery replacement can be greatly reduced or eliminated. There is an effect that can be done.

Embodiments of the present invention will be described below.
(Embodiment 1)
As shown in FIG. 2A, the wireless sensor device of this embodiment is a flat box by fitting and attaching a cover 8a made of a synthetic resin molded product to a front opening of a case 8b made of a synthetic resin molded product. A main body housing A formed into a shape is configured by incorporating a power source section 5 including a circuit section and a primary battery 1 shown in FIG. 1, and the main body housing A is an object to be warned as shown in FIG. 2 (b). One side (the rear side in FIG. 2 (a)) is attached to the glass plate G of the sliding window W, which is a fitting that can be freely opened and closed in the opening of the building, and the other side (FIG. 2). An opening / closing part 3 that opens and closes when the primary battery 1 for the power supply part to be installed is replaced is provided on the front side in FIG.

  Here, in this embodiment, by using a thin coin battery as the primary battery 1, the thickness of the main body housing A is set to 6 mm or less, whereby the main body housing A becomes the window body W when the window body W is opened and closed by dragging. I try not to interfere (do not hit). In FIG. 2B, reference numeral 11 denotes a crescent lock.

  As shown in FIG. 1, the circuit portion housed in the main body housing A is fixed in the main body housing A and detects the vibration of the glass plate G, and opens and closes the window W. An open / close detection unit 2B for detecting, a glass breakage processing circuit 3A for processing a detection signal of the glass breakage detection unit 2A, an open / close processing circuit 3B for processing a detection signal of the open / close detection unit 2B, and the processing circuits 3A and 3B. A state of the detection signal, that is, a wireless transmission circuit 4 that transmits detection information from the antenna AT as a radio wave signal by an impulse-type ultra-wideband wireless <UWB (Ultra Wide Band)>. The primary battery 1 supplies the battery. Here, transmission by impulse UWB occupies an extremely wide frequency band of several GHz by transmitting transmission data directly by a pulse train having a pulse width of several hundreds psec by a baseband signal not using a carrier wave, Only instantaneous power at the time of transmission is required. Therefore, power transmission can be suppressed by performing transmission by this impulse type UWB. In particular, when the detection information in the detection sensor is 1-bit to small-bit information, even if the detection information is transmitted together with the identification information of the wireless sensor device, the amount of information is small, and the power consumption required for transmission can be extremely reduced.

  Here, the glass breakage detection unit 2A used in the present embodiment is configured by a piezoelectric ceramic that converts acoustic emission vibration generated when the glass sheet G is broken into a detection signal including a voltage signal.

  The glass breakage processing circuit 3 extracts a predetermined frequency component from the detection signal output from the glass breakage detection unit 2A by a filter (not shown), and the signal of the predetermined frequency component is output by an amplifier (not shown). The amplified signal level is compared with a reference value Vref with a comparator (not shown) to determine the presence or absence of glass breakage. As a result of this determination, the glass breakage detection signal is used as detection information. Output to the wireless transmission circuit 4.

  The open / close detection unit 2B is constituted by a reed switch, and is attached to one side or both sides in the main body housing A as shown in FIG. 2A, and the vertical frame member 10a of the window frame 10 shown in FIG. 2B. The opening and closing of the window body W is detected by detecting the magnetism of the magnet M attached to the magnet M. When the window body W is closed, the magnet M and the opening / closing detection unit 2B made of a reed switch face each other. The opening / closing detection unit 2A is turned on, and when the window body W is opened, the opening / closing detection unit 2B is moved away from the magnet M and turned off. The on / off signal (detection signal) of the opening / closing detection unit 2B accompanying the opening / closing of the window W is processed by the opening / closing processing circuit 4 so that when the window W is opened, a wireless transmission circuit is used as the opening detection signal (detection information). 4 is output.

  Since the wireless transmission circuit 4 is configured by the impulse UWB transmission circuit as described above, for example, when detection information of any of the open / close detection units 2A and 2B is input, an impulse train having a predetermined pulse width is set to a predetermined value. By repeatedly reducing the current consumption during standby of the open / close detection units 2A and 2B, the energy consumption per day of the wireless sensor device can be reduced to about 300 mAs. When a thin coin type battery having a battery capacity of 170 mAh is used as the primary battery 1, the battery life is about 5 years. As a result, the battery needs to be replaced about once every five years.

  On the other hand, when the wireless transmission circuit 4 is constituted by, for example, a so-called low-power wireless circuit, the battery needs to be replaced about once every two years if calculated under the same conditions.

  FIG. 3A shows an example of an impulse UWB wireless transmission circuit 4 corresponding to this embodiment. In this illustrated example, a regulator 40 that is driven by the primary battery 1 and converts it into a predetermined voltage, A clock generation circuit 41 that uses the constant voltage output of the regulator 40 as a power source, a logic circuit 42 that reads detection information (data) from each of the processing circuits 3 and 4 by a clock of the clock generation circuit 41, and a logic circuit 42 The pulse driver 44 outputs the pulse signal corresponding to the data as it is, and sends it to the antenna AT via the filter 43 for transmission. The regulator 40 is in a standby state until detection information (data) is given. If there is almost no power consumption and detection information (data) is given, it becomes a trigger signal and Ri, and outputs a constant voltage above.

  As described above, the impulse transmission UWB wireless transmission circuit 4 does not use a carrier wave and directly performs impulse transmission, so that the circuit becomes relatively small, and power consumption during standby and transmission can be greatly reduced. As described above, since the amount of data to be transmitted is small, such as the detection information when the glass breaks or the window W is opened, the transmission data time is shortened accordingly, and the average current consumption during standby and wireless transmission can be reduced to several μA. It becomes possible.

FIG. 3B shows an example of a wireless transmission circuit 100 in the case of a conventional low-power radio. In this illustrated example, data obtained by D / A converting detection information in a logic circuit 101 is output by a carrier wave generation circuit 102. It is placed on the generated carrier wave, amplified by the amplifier 103, and then transmitted through the antenna AT. Therefore, the carrier wave comprising the D / A conversion circuit in the logic circuit 101, the VCO 102a, the PLL 102b, and the clock generation circuit 102c. Since the generation circuit 102 is required, the circuit scale increases, and as a result, power consumption as a wireless transmission circuit is larger than that of an impulse UWB wireless transmission circuit. In FIG. 3B, reference numeral 104 denotes a regulator, and 105 denotes a filter.
(Embodiment 2)
In the first embodiment, the power supply unit 5 is composed of the primary battery 1, but the wireless sensor device of the present embodiment is a secondary battery (see FIG. 4) that is charged with the solar battery T and the generated energy of the solar battery T ( In order to cover the power for operation with the power generated by the solar cell T, the battery does not need to be replaced. Therefore, the body housing A can be opened and closed for battery replacement. There is no section. Further, as the solar cell T, an amorphous solar cell with low cost and high energy conversion efficiency is used.

  Here, in the main body housing A of the present embodiment, the solar cell T is joined so that the light receiving surface X of the solar cell T is exposed on the front side of the cover 8a as shown in FIG. FIG. 5B shows a cross section of the joining portion between the solar cell T and the cover 8a. As shown in the drawing, a fitting hole 9 into which the solar cell T is fitted is provided on the front surface (front surface) side of the cover 8a. The cover 8a and the solar cell are fitted by fitting T with an adhesive S (for example, silicon adhesive) applied around the hole 9a that is open to the bottom of the fitting hole 9 so as to communicate with the case 8b. The joint portion with T has a waterproof structure. Further, the fitting portion of the cover 8a and the case 8b is joined by ultrasonic welding to form a waterproof structure. The energy generated by the solar cell T is supplied to the secondary battery 6 disposed on the case 8b side via a connecting line (not shown) and a backflow prevention diode D to charge the secondary battery 6. Yes.

  Since the configuration of the circuit unit other than the power source unit 5 is the same as that of the first embodiment, the same reference numerals are given to the components of the circuit unit, and the description of the configuration and functions is omitted. However, in this embodiment, the wireless transmission circuit 4 may be configured by a low-power wireless circuit or a UWB circuit used in the first embodiment.

  Thus, in the wireless sensor device of the present embodiment, the double-sided adhesive tape is attached to the glass plate G of the window W with the bottom surface of the case 8b opposite to the solar cell T so that the light receiving surface X of the solar cell T faces the indoor direction. Install by using etc. As a result, it is possible to effectively use indoor lighting or light guiding from outside the room. That is, compared with the case where the light receiving surface X of the solar cell T is installed in the same place in the outdoor direction, the average illuminance becomes higher and power can be generated effectively.

  Further, when the light receiving surface X is directed in the outdoor direction, light may be blocked by a shutter or the like, resulting in insufficient power generation. As a result, the operation of the wireless sensor device may stop. By using the illumination, etc., it is possible to stabilize the amount of light received by the solar cell T without worrying about stopping the operation and without reducing the amount of light incident on the light receiving surface X due to contamination of the glass plate G.

  In this embodiment, since the body housing A does not require an opening / closing part for battery replacement, the waterproof structure is formed between the solar cell T and the cover 8a and between the cover 8a and the case 8b as described above. As a result, the waterproof structure of the wireless sensor device can be realized at a low cost, and can be used in a humid place such as a bathroom.

  Furthermore, in the present embodiment, when a low-power wireless circuit is used as the wireless transmission circuit 4, the power consumption of the entire wireless sensor device is completely generated by the generated energy of the solar cell T when used in an average 300 lx environment. I was able to cover. On the other hand, when the conditions other than the wireless transmission circuit 4 are the same and a UWB system circuit is used for the wireless transmission circuit 4, the power consumption of the entire wireless sensor device is determined by the generated energy of the solar cell T under an average 150 lx environment. I was able to compensate completely.

  In the first and second embodiments, the glass breakage detection unit 2A and the open / close detection unit 2B are provided. However, only one of them may be provided, and in this case, the corresponding processing circuit 3A or 3B is not necessary.

1 is a circuit configuration diagram of Embodiment 1. FIG. (A) is a perspective view of Embodiment 1, (b) is a mounting state explanatory view of Embodiment 1. FIG. (A) is a circuit diagram of an example of a wireless transmission circuit used in Embodiment 1, and (b) is a circuit diagram of a conventional wireless transmission circuit as a comparative example. 6 is a circuit configuration diagram of Embodiment 2. FIG. (A) is a perspective view of Embodiment 2, (b) is a principal part expanded sectional view which shows the attachment state of the solar cell of Embodiment 2. FIG.

Explanation of symbols

A Main body housing M Magnet AT Antenna 1 Primary battery 2A Glass breakage detection unit 2B Open / close detection unit 3A Glass breakage processing circuit 3B Open / close processing circuit 4 Wireless transmission circuit 5 Power supply unit

Claims (6)

A detection unit that detects a state of an opening of a building, a processing circuit that processes a detection signal of the detection unit, a wireless transmission circuit that transmits a radio wave signal according to the state of the detection signal processed by the processing circuit, The processing circuit including the detection unit and a power supply unit including a primary battery that supplies operation power to the wireless transmission circuit, and the wireless transmission circuit is configured by an ultra-wideband wireless transmission circuit. Wireless sensor device. A detection unit that detects the state of the opening of the building, a processing circuit that processes a detection signal of the detection unit, a wireless transmission circuit that transmits a radio wave signal according to the state of the detection signal processed by the processing circuit, A solar cell and a power storage element that is charged with the energy of the solar cell, the processing circuit including the detection unit, and a power supply unit that supplies operating power to the wireless transmission circuit from the power storage element, A wireless sensor device comprising a body housing joined so that a light receiving surface of a battery is exposed on the surface. The wireless sensor device according to claim 2, wherein the wireless transmission circuit includes an ultra-wideband wireless transmission circuit. 4. The wireless sensor according to claim 2, wherein a surface of the main body housing to which the solar cell is joined is a surface opposite to a surface to be attached to a glass plate of a fitting provided in the opening. apparatus. The wireless sensor device according to any one of claims 2 to 4, wherein a joint portion between the solar cell and the main body housing has a waterproof structure. The said detection part is comprised by at least one from the reed switch opened and closed according to the distance with the piezoelectric ceramic or magnet which detects the vibration by an acoustic mission, The one of Claim 1 thru | or 5 characterized by the above-mentioned. Wireless sensor device.

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