JP5613589B2 - transceiver - Google Patents

Description

  The present invention relates to a wireless device that transmits or receives signals wirelessly.

  In recent years, a human body sensor is widely used to control lighting of a lighting fixture in accordance with the approach of a human body. In the conventional human body sensor, only the sensor portion is exposed from the wall surface or ceiling, and the main body portion such as a circuit board is installed inside the wall surface or ceiling, via an electric wire disposed on the back surface of the wall surface or ceiling. It is connected to a commercial power source or lighting device.

  On the other hand, Patent Document 1 proposes a human body sensor that transmits a detection signal via wireless communication using radio waves. However, since this human body sensor is supplied with electric power through an electric wire, wiring work is required for installation. That is, in order to additionally install a conventional human body sensor in an existing house, a hole is made in the wall or ceiling, and wiring work is required on the back side of the wall or ceiling.

  In order to eliminate such wiring work, a human body sensor that uses a long-life battery such as a lithium battery as a power source and transmits signals wirelessly has been proposed. Unlike the conventional human body sensor, the human body sensor incorporating the battery and the wireless transmission circuit exposes not only the sensor unit but also the circuit board, the battery, and the antenna device from the wall surface and the ceiling. In order not to make the user feel a sense of incongruity, it is important to design in a compact manner in order to make the appearance inconspicuous.

  However, when the circuit board is simply designed to be compact, the length of the ground of the wireless transmission circuit becomes shorter with respect to the wavelength of the radio wave used for wireless communication, which causes a problem that the gain of the antenna decreases. .

  The same problem is not limited to a human body sensor, but is a problem common to radios that transmit or receive signals wirelessly.

JP 2006-253092 A

  The present invention has been made to solve the above-described problems of the conventional example, and in a radio that transmits or receives a detection signal via radio communication using radio waves, it is possible to achieve both reduction in size and antenna gain. With the goal.

In order to achieve the above object, a wireless device of the present invention includes an antenna and a wireless communication circuit to which the antenna is connected, and the wireless communication circuit transmits or receives a signal via wireless communication using radio waves. , a part of the outer peripheral portion is formed on notched circuit board, said circuit is an antenna disposed on one side across the cutout portion of the substrate, which is connected to the ground of the circuit board from the other end The conductor extends from the other end side to the one end side .

In this invention, the notch has a first side and a second side orthogonal to each other, and the one end side and the other end side are the first side and the second side, respectively. And the intersection of the second side is preferably on the opposite side .

In the present invention, the combined electrical length of all the equivalent electrical lengths of the wiring pattern and electrical / electronic circuit mounted on the circuit board except the antenna and the electrical length of the conductor is used for wireless communication. It is preferably 1/4 of the wavelength of the carrier wave .

In this invention, comprising a housing made of resin molding that accommodates the circuit board,
It is preferable that the conductor extends along the inner wall of the housing .

  In the present invention, it is preferable that an insulating coating is formed on the surface of the conductor.

  In the present invention, a battery for supplying power to the wireless communication circuit of the circuit board is disposed in the notch, and a tip portion of the conductor not connected to the ground is a negative electrode of the battery. It is preferably connected directly to the electrode.

  In this invention, it is preferable that a rib for reinforcing the casing is formed on the inner wall of the casing, and a recess for sandwiching and holding the conductor is formed on the rib.

  According to the wireless device of the present invention, the antenna is disposed on one end side with the notch interposed therebetween, and the conductor connected to the ground of the circuit board extends from the other end side. The gain of the antenna can be improved. In addition, since a component having a large height can be arranged in the notch portion of the circuit board, it is easy to suppress the height of the radio device.

The perspective view which shows the use condition of the human body detection sensor incorporating the radio | wireless machine of this invention. The front view which shows the structure in the state which removed the cover of the human body detection sensor by 1st Embodiment of this invention. Sectional drawing which shows the structure of the peripheral part of the housing | casing of a human body detection sensor. The front view which shows the structure in the state which removed the cover of the human body detection sensor by 2nd Embodiment of this invention. The front view which shows the structure in the state which removed the cover of the electronic device with which the radio | wireless machine was integrated as a modification of this invention.

(First embodiment)
A human body sensor configured using the wireless device according to the first embodiment of the present invention will be described. The human body sensor 1 uses a battery as a power source and transmits a detection signal via radio communication using radio waves. As shown in FIG. 1, the human body sensor 1 is attached to the ceiling by a double-sided adhesive tape, an adhesive, a screw, or the like. . The switch 2 provided on the wall surface is provided with a wireless receiver for receiving a detection signal transmitted from the human body sensor 1. The switch 2 is connected to an illumination device 3 provided on the ceiling via an electric wire 4.

  The switch 2 is an electronic switch (load control device) using a non-contact switch element such as a triac, for example, and can replace a conventional 2-wire switch that mechanically opens and closes a contact without wiring work. . Accordingly, the human body sensor 1 can be additionally installed in an existing house without wiring work. The human body sensor 1 and the switch 2 can perform wireless communication using radio waves such as specific low power radio, for example. When the human body sensor 1 detects the presence of a person, a detection signal is transmitted to the switch 2. Then, the switch 2 turns on the lighting device 3. Further, when the presence of a person is no longer detected by the human body sensor 1, a non-detection signal is transmitted to the switch 2 after a predetermined time has elapsed, and the switch 2 turns off the lighting device 3.

  FIG. 2 shows a configuration of the human body sensor 1 as an example of the human body sensor 1 with the cover of the human body sensor 1A removed. The human body detection sensor 1A is attached to the ceiling with a double-sided adhesive tape or the like as described above, and the housing 10 is substantially circular in front view, and insulates the wireless transmission unit 25 from the outside of the human body detection sensor 1A. In order to protect the wireless transmitter 25 from unexpected static electricity, it is formed by resin molding. In the center of the mounting surface 10a of the housing 10 (the surface opposite to the surface attached to the ceiling by the double-sided adhesive tape or the like), a sensor unit 11 composed of an infrared sensor, an illuminance sensor, and the like is provided. The sensor unit 11 is, for example, a circular shape when viewed from the front. The circuit board 20 and the battery 12 are mounted on the mounting surface 10a.

  A part of the outer periphery of the circuit board 20 has an arc shape corresponding to the circular shape of the housing 10, and the other part of the outer periphery is cut away at a right angle so as to avoid the sensor unit 11 and the battery 12. . That is, the circuit board 20 has a first side 21 and a second side 22 that are orthogonal to each other, and a side where the first side 21 and the second side 22 form 90 degrees is a notch. Further, the mounting surface 10a is arranged such that the first side 21 and the second side 22 are substantially equidistant from the sensor unit 11 (in the configuration example of FIG. 1, so as to be substantially circumscribed by the circular shape of the sensor unit 11). Is arranged. Thus, since the sensor part 11 and the battery 12 which are parts with a large height dimension can be arrange | positioned in the notch part of the circuit board 20, it becomes easy to suppress the height dimension of the human body sensor 1A. .

  The circuit board 20 includes a wireless transmission unit (wireless communication circuit) 25 that transmits a detection signal of the sensor unit 11 via wireless communication using radio waves, a control unit 26 that controls the sensor unit 11 and the wireless transmission unit 25, and An operation unit 27 for confirming whether or not radio waves are correctly transmitted when the human body sensor 1A is installed is provided.

  The control unit 26 includes, for example, a CPU that performs calculation processing, a ROM that stores a control program, a RAM that temporarily stores calculation results, and the like. The detection result by the sensor unit 11, specifically, an infrared sensor. Has comprehensively determined that it has detected or stopped detecting infrared light of a specific wavelength, and that the ambient brightness by the illuminance sensor is above or below a certain level of brightness, and performs predetermined detection according to the determination result. It is determined whether to transmit a signal or a non-detection signal. The wireless transmission unit 25 converts the detection signal or non-detection signal from the control unit 26 into a radio signal having a predetermined frequency and transmits the radio signal from the antenna 25a. The antenna 25 a is rotatable around a horizontal rotation axis provided in the housing 10. The electrical length of the antenna 25a is preferably about ¼ of the wavelength of the carrier wave used for wireless communication.

  Further, the wireless transmission unit 25 includes an oscillation circuit and the like, oscillates a carrier wave having a predetermined frequency, and transmits a detection signal or the like superimposed on the carrier signal. The operation unit 27 includes an operation mode changeover switch 27a for switching between a normal use mode and a registration mode at the time of new setting or setting change, and an ambient environment that automatically controls lighting and extinguishing of the lighting device 3 by the human body sensor 1A. The brightness setting trimmer 27b for selecting the brightness of the lighting device, the lighting holding time setting switch 27c for lighting the lighting device 3 after the presence of the person is not confirmed by the human body sensor 1A, and used in the registration mode. A confirmation switch 27d and a registration switch 27e are provided.

  By the way, it is effective to increase the length of the ground formed on the circuit board 20 in order to reduce the antenna gain while reducing the size of the housing 10 of the human body sensor 1A. However, it is necessary to reinforce the ground of the wireless transmission unit 25 with the limited size of the circuit board 20 while the size reduction of the housing 10 is required. Therefore, in the present embodiment, the antenna 25a is disposed on one end side 20a across the notch portion of the circuit board 20, and the conductor 29 connected to the ground terminal (connector) 28 of the circuit board 20 from the other end side 20b. By pulling out, the ground is strengthened. That is, since the ground terminal 28 is connected to the ground on the other end side 20 b of the circuit board 20, the ground of the wireless transmission unit 25 is extended to the tip of the conductor 29, and is substantially all around the inner wall of the housing 10. It will be formed over. Thereby, the ground of the wireless transmission part 25 is strengthened and the gain of the antenna 25a can be improved.

  The conductor 29 is a so-called ground line (counterpoise), and extends from the other end side 20 b of the circuit board 20 to the one end side 20 a along the inner wall of the housing 10. As a result, even if the housing 10 has a limited size, the conductor 29 can be maximized in length, and the ground of the wireless transmission unit 25 can be strengthened efficiently. At this time, a concave notch is formed with respect to a value of λ (lambda) which is the wavelength of the carrier wave of the wireless communication, which is represented by the product of the reciprocal of the carrier frequency of the wireless communication by radio waves and the propagation speed (light speed). From the mounting portion (reference numeral AA in FIG. 2) of the antenna 25a to the other end (reference numeral BB in FIG. 2) at the farthest end through the path C along the outer periphery of the circuit board 20 It is desirable that the length of the following relationship: That is, the ground potential pattern mounted on the circuit board 20 except for the antenna 25a, the wiring patterns for transmitting various potentials, and all the equivalent electrical lengths of the electric and electronic circuits mounted on the circuit board 20, and the electrical potential of the conductor 29 It is desirable that the combined electrical length with the length corresponds to ¼ of λ (quarter wavelength). Here, in order to design the electrical length (electrical length) from the other end side 20b of the circuit board 20 to the one end side 20a to an electrical length corresponding to ¼ times (quarter wavelength) of λ, it is generally known. In the antenna gain test, using the length of the conductor 29 as a parameter, the length of the conductor 29 may be determined so that the carrier wave of the radio signal can be received exceeding the reception level specified in the design. The circuit board 20 designed in this way has a combined electrical length of all the equivalent electrical lengths of the wiring patterns and electrical and electronic circuits mounted on the circuit board 20 except the antenna 25a and the electrical length of the conductor 29. However, this is equivalent to ¼ times (quarter wavelength) of the wavelength of the carrier wave used for wireless communication. As described above, by appropriately setting the length of the conductor 29, a sufficient antenna gain can be secured.

  FIG. 3 shows a peripheral portion of the housing 10 and a cross section of the conductor. Ribs 10b are formed on the peripheral edge of the casing 10 with appropriate intervals. The rib 10b is formed from the mounting surface 10a of the housing 10 to the inner wall 10c at the peripheral edge, and increases the strength of the housing 10. Further, a concave portion 10d for holding the conductor 29 is formed at a joint portion between the rib 10b and the inner wall 10c.

  The conductor 29 is configured by a metal wire 29a and an insulating coating 29b formed on the surface of the metal wire 29a. A short circuit between the metal wire 29a and another electrical configuration can be prevented by the insulating coating 29b. The recess 10d formed in the rib 10b is formed with a width dimension that is equal to or slightly smaller than that of the conductor 29. Therefore, by inserting the conductor 29 into the recess 10d, the conductor 29 is securely held, and the reliability of the function of improving the gain of the antenna 25a is increased.

  In the human body sensor 1A according to the present embodiment, the wireless transmission unit 25 has a transmission function of transmitting the detection signal of the sensor unit 11 via wireless communication using radio waves, but various modifications are possible depending on the application. It is. For example, when the wireless device of the present invention is applied to a wireless device that requires a wireless reception function (switch 2 in the above-described embodiment), a wireless reception unit (wireless communication) is used instead of the wireless transmission unit 25. Circuit). In addition, in a device that requires a wireless transmission function and a reception function, the wireless transmission unit 25 and the wireless reception unit may be provided. This means that the conductor 29 of the present invention can be applied not only to a wireless receiver, but also to a wireless transmitter or a wireless transceiver, and can be widely applied to general wireless devices.

(Second Embodiment)
FIG. 4 shows a human body sensor 1B configured using a wireless device according to the second embodiment. In the human body sensor 1 </ b> B, the conductor 29 is directly connected to the negative electrode of the battery 12. That is, a terminal 29c that is connected to the negative electrode when the battery 12 is loaded is provided at the tip of the conductor 29 that is not connected to the ground terminal 28.

  According to the human body sensor 1B of the second embodiment, the tip of the conductor 29 is directly connected to the negative electrode of the battery 12, so that the conductor connecting the negative electrode of the battery 12 and the ground of the circuit board 20 is used. Need not be provided separately. Thereby, the structure of the human body sensor can be simplified, and the cost can be reduced.

  The present invention is not limited to the configuration of the above-described embodiment, and an antenna 25a is disposed on one end side 20a across at least the notch portion of the circuit board 20, and is connected to the ground of the circuit board 20 from the other end side 20b. It is sufficient that the conductor 29 is extended.

  The present invention can be modified in various ways, and the length and shape of the conductor used for extending the ground can be set according to the wavelength of the radio wave used for communication. For example, by adding the rib 10b over the entire inner wall of the housing 10 and rotating the conductor 29 along the inner wall of the housing 10 as necessary, the conductor 29 having a length corresponding to the wavelength can be reliably obtained. It can be held. Moreover, the length of the ground can be increased by winding the conductor spirally or by forming it in a meander shape along the inner wall of the housing 10. Further, the connection between the conductor 29 and the ground is not limited to the connector shown in FIG. 2 and the like, and may be made by solder.

  Further, the wireless device is not limited to the form incorporated in the disk-shaped human body sensor described above, and can be widely applied to electronic devices having a normal box-shaped wireless function, for example, as shown in FIG. . In the electronic device 1C, the radio unit accommodates the antenna 25a, the circuit board 40 that constitutes the radio communication circuit, the battery 12 that is disposed in the cutout portion of the circuit board 40, the circuit board 40, the battery 12, and the like. It is comprised by the housing | casing 30 grade | etc.,. The antenna 25a is disposed on one end side 40a of the circuit board 40, and a conductor 49 connected to the ground terminal 48 of the circuit board 40 is drawn out from the other end side 40b across the notch. Also in this electronic device 1 </ b> C, from the viewpoint of strengthening the ground of the circuit board 40, it is desirable that the conductor 49 extends to the one end side 40 a of the circuit board 40 along the inner wall of the housing 30.

1A Human body sensor (radio device)
DESCRIPTION OF SYMBOLS 10 Case 12 Battery 20 Circuit board 25a Antenna 29 Conductor

Claims (7)

In a wireless device that includes an antenna and a wireless communication circuit to which the antenna is connected, and that transmits or receives a signal via wireless communication using radio waves,
The wireless communication circuit is formed on a circuit board in which a part of the outer peripheral portion is cut out,
Antenna is disposed on one end sides of the cutout portion of the circuit board, the ground and connected to a conductor of said circuit board from the other end is extended over the one end side from the other end A radio characterized by. The notch has a first side and a second side orthogonal to each other,
The said one end side and the said other end side are the opposite sides to the intersection of the said 1st edge | side and the said 2nd edge among the said 1st edge | side and the said 2nd edge, respectively. transceiver. The combined electrical length of all the equivalent electrical lengths of the wiring patterns and electrical and electronic circuits mounted on the circuit board except the antenna and the electrical length of the conductor is the wavelength of the carrier wave used for wireless communication. The wireless device according to claim 1, wherein the wireless device is ¼ . A housing made of resin molding that accommodates the circuit board,
The wireless device according to any one of claims 1 to 3, wherein the conductor extends along an inner wall of the casing .   The wireless device according to any one of claims 1 to 4, wherein a coating having an insulating property is formed on a surface of the conductor. The notch is provided with a battery for supplying power to the wireless communication circuit of the circuit board,
The radio | wireless as described in any one of Claim 1 thru | or 5 with which the front-end | tip part of the side which is not connected with the said ground of the said conductor is directly connected to the negative electrode of the said battery. Machine. Ribs for reinforcing the casing are formed on the inner wall of the casing,
The wireless device according to claim 4 , wherein the rib is formed with a recess for sandwiching and holding the conductor.

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