JP5762055B2 - Direction detection device, air conditioner, and air conditioning system - Google Patents

Description

  The present invention relates to a direction detection device, an air conditioning device, and an air conditioning system, and more particularly, to a direction detection device that detects a direction in which a communication device is located, an air conditioning device including the direction detection device, and an air conditioning system.

  In recent years, there has been an urgent need to cope with problems such as global warming and depletion of energy resources, and energy saving of electrical equipment installed in office buildings and houses has been promoted. The proportion of power consumed by air conditioning equipment is relatively high throughout the year. Therefore, if the power consumed by the air conditioning equipment can be reduced, a great energy saving effect can be expected.

  For this reason, in work spaces such as offices, air conditioning systems that control air conditioners while monitoring the temperature of each worker's desk have been proposed. In this type of air conditioning system, the positional relationship between the communication terminal that transmits the result of measuring temperature, humidity, and the like and the air conditioner needs to be known.

  Therefore, a technique for easily measuring the positional relationship between the control target device and the communication terminal has been proposed (see, for example, Patent Document 1). The apparatus described in Patent Document 1 has a plurality of receiving terminals whose positions in the office are known. Then, the position of the communication terminal is detected based on the time until the radio wave from the communication terminal reaches the receiving terminal. By using the device described in Patent Document 1, even if the position of the communication terminal for monitoring the temperature, illuminance, etc. on the desk changes due to, for example, office redesign, the air conditioner, lighting device, etc. It becomes possible to operate efficiently.

JP 2009-253494 A

  When using the apparatus described in Patent Document 1, it is necessary to install a receiving terminal for receiving radio waves from a communication terminal in the office. For this reason, there exists a problem that the manufacturing cost of an apparatus and a running cost become comparatively expensive.

  Further, in the control of the air conditioner and the lighting device, it is important in which direction the communication terminal is located based on the air conditioner or the like. For example, if the control of the air conditioner is taken as an example, even if the communication terminal has moved somewhat, if there is no change in the direction in which the communication terminal is viewed from the air conditioner, the output from the air conditioner will not change significantly, Comfortable air conditioning can be realized.

  The present invention has been made under the circumstances described above, and it is an object of the present invention to efficiently control a controlled device and to reduce the cost of the device by detecting the direction in which the controlled device is located. And

In order to achieve the above object, the direction detection device of the present invention provides:
A direction detection device that detects a direction in which a plurality of communication devices are located and transmits information indicating the detected direction used for controlling the plurality of communication devices to the plurality of communication devices ,
A plurality of antennas having different directivities, and
Selecting means for sequentially selecting one antenna from the plurality of antennas;
An output means for sequentially outputting radio signals to the plurality of communication devices via each antenna selected by the selection means;
Communicates with a plurality of the communication device, a communication means for receiving information indicating a strength the communication device receives each radio signal the output means has outputted from each of the communication device,
Direction detection means for detecting the direction in which each of the communication devices is located, based on information received by the communication means,
When the communication unit receives the information from the communication device, the selection unit switches the antenna selected from the plurality of antennas to another antenna among the plurality of antennas,
The output means, when switching the antenna selected by the selection means, outputs a radio signal to the communication device via the antenna switched by the selection means,
The direction detection unit identifies an antenna having the strongest radio signal intensity received by the communication device from the plurality of antennas based on information received by the communication unit, and determines the directivity of the identified antenna. Based on this, the direction in which the communication device is located is detected.

  According to the present invention, the direction in which the communication device is located is detected based on the signal strength when the signal output through the antenna having directivity is received. Therefore, the controlled device can be efficiently controlled using the detection result. Further, the direction in which the communication device is located can be detected with a device having a simple configuration without using a receiving device with a known positional relationship. Therefore, the manufacturing cost and running cost of the device can be reduced.

It is a block diagram of a control system concerning a 1st embodiment. It is a figure which shows arrangement | positioning of the apparatus which comprises a control system. It is a block diagram of each apparatus which comprises a control system. It is a figure which shows the E surface directivity of an antenna. It is a figure which shows the H surface directivity of an antenna. It is a figure which shows arrangement | positioning of an antenna. It is a flowchart which shows a direction detection process. It is a block diagram of the communication terminal which concerns on 2nd Embodiment. It is a flowchart which shows the process which a communication terminal performs. It is a perspective view which shows the shield with which the direction detection apparatus which concerns on 3rd Embodiment is provided with an antenna. It is a block diagram of the communication terminal which concerns on 4th Embodiment. It is a perspective view of the motor which rotates an antenna. It is a figure which shows the modification of a control system.

<< First Embodiment >>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a control system 10 according to the present embodiment. The control system 10 is a system that controls the air conditioner 30 and the lighting device 40 provided in a space such as an office where a desk is disposed. As shown in FIG. 1, the control system 10 includes three communication terminals 50 ₁ to 50 _{3 including} an air conditioner 30, _four illumination devices 40 ₁ to 40 ₄ , and a direction detection device 60.

  FIG. 2 is a diagram showing an arrangement of devices constituting the control system 10. As shown in FIG. 2, the air conditioner 30 is disposed at the center of the ceiling of the space 100. The air conditioner 30 generates conditioned air by cooling or heating the air in the space 100 and discharges the air into the space 100.

  FIG. 3 is a block diagram of each device constituting the control system 10. As can be seen from FIG. 3, the air conditioner 30 includes a communication unit 31 and an output control unit 32.

  The communication unit 31 includes a communication interface that performs packet communication using, for example, UWB (Ultra Wide Band) radio waves. The communication unit 31 performs wireless communication with the communication terminal 50. When the information output from the communication terminal 50 is received, the received information is output to the output control unit 32. In addition, information corresponding to the received information is output to communication terminal 50.

  The output control unit 32 receives information output from the communication terminal 50 via the communication unit 31. Then, the amount of conditioned air discharged into the space 100 and the discharge direction are adjusted according to the content of the received information. For example, the air conditioner 30 has four outlets for discharging conditioned air in four directions. The output control unit 32 adjusts the amount of conditioned air output from each outlet by adjusting the rotational speed of the fan included in the air conditioner 30. And the discharge direction of conditioned air is adjusted by adjusting the angle of each louver arrange | positioned at each blower outlet.

As illustrated in FIG. 2, the lighting devices 40 ₁ to 40 ₄ are rectangular lighting devices whose longitudinal direction is the Y-axis direction. The illumination devices 40 ₁ and 40 ₂ are arranged along the inner wall surface on the left side (−X side) of the space 100. The lighting devices 40 ₃ and 40 ₄ are disposed along the inner wall surface on the right side (+ X side) of the space 100.

As can be seen with reference to FIG. 3, the lighting devices 40 ₁ to 40 ₄ include a communication unit 41 and a light control unit 42.

  The communication part 41 is comprised including the communication interface which performs packet communication using the electromagnetic wave of UWB similarly to the communication part 31 of the air conditioning apparatus 30 mentioned above. The communication unit 41 performs wireless communication with the communication terminal 50. When the information output from the communication terminal 50 is received, the received information is output to the dimming unit 42. In addition, information corresponding to the received information is output to communication terminal 50.

The light control unit 42 receives information output from the communication terminal 50 via the communication unit 41. And the light quantity of the illumination light inject | emitted from the illuminating device 40 is adjusted according to the content of the received information. For example, the illumination devices 40 ₁ to 40 ₄ have a plurality of LEDs or fluorescent lamps as light sources. The dimmer 42, the number of LED and the lighting, by increasing or decreasing the number of fluorescent lamps, to adjust the light amount of the illumination light emitted from the illumination device 40 ₁ to 40 _4.

The communication terminals 50 ₁ to 50 ₅ detect, for example, ambient temperature, illuminance, and the like, and output information about the detection result to the air conditioner 30 or the lighting device 40. As shown in FIG. 3, the communication terminals 50 ₁ to 50 ₅ include a plurality of (for example, four) antennas 61 _{1 to} 61 ₄ , an antenna switching unit 62, a communication unit 63, and a direction detection that constitute the direction detection device 60. Part 64 and control part 65.

Antenna 61 _N has a higher becomes such directional sensitivity in a specific direction. Specifically, the antenna 61 _N includes a E-plane directivity as shown in FIG. 4, and H-plane directivity shown in FIG. As the antenna 61, for example, a loop antenna or a collinear antenna can be used.

These four antennas 61 ₁ , 61 ₂ , 61 ₃ , and 61 ₄ have a + Y direction as indicated by arrows a 1, a 2, a 3, and a 4, as indicated by arrows a 1, a 2, a 3, and a 4, as can be seen from FIG. Are arranged so as to coincide with the direction, + X direction, -Y direction, and -X direction.

Antenna switching unit 62, as shown in FIG. 6, and has a selection switch SW for selecting a terminal antenna 61 _{1-61 4} is connected. Then, based on the instruction of the control unit 65, by operating the selection switch SW, to select one of the antenna 61 of the antennas ₆₁ 1 to 61 _4. The selected antenna 61 is connected to the communication unit 63.

  When receiving an instruction from the control unit 65, the communication unit 63 outputs a radio wave modulated based on predetermined information. Thereby, a radio wave is emitted through the antenna 61 selected by the antenna switching unit 62. Further, the communication unit 63 receives information transmitted from the communication unit 31 of the air conditioner 30 or the communication unit 41 of the lighting device 40 and outputs the information to the direction detection unit 64.

  The direction detection unit 64 is based on the information output from the communication unit 63 and the information on the antenna 61 selected by the antenna switching unit 62, or the direction in which the air conditioner 30 is located based on the communication terminal 50 or the lighting device The direction in which 40 is located is detected.

  The control unit 65 includes a CPU (Central Processing Unit), a main storage unit, an auxiliary storage unit, and the like, and comprehensively controls the above-described units.

Next, a description is given of the direction detecting operation of the communication terminal 50 ₁ as described above will be described with reference to FIG. First, the control unit 65 of the direction detection device 60 configuring the communication terminal 50 instructs the communication unit 63 to output a direction search request signal Sd (1) to the air conditioner 30 (step S101). Thereby, the direction search request signal Sd (1) is output to the air conditioner 30 through the antenna 61 selected by the antenna switching unit 62.

Air conditioner 30 receives the direction search request signal Sd (1), to the communication terminal 50 ₁ and outputs a search enable signal Sp (1) (step S201).

  When the control unit 65 confirms the reception of the search permission signal Sp (1), the control unit 65 initializes the counter value N of the built-in counter to zero (step S102).

  Next, the counter value N is incremented (step S103).

Next, the control unit 65, the antenna switching unit 62, and instructs the selection of the corresponding antenna 61 _N to the counter value N (step S104). For example, when the counter value N is 1, the antenna 61 ₁ is selected, when the counter value N is 2, the antenna 61 ₂ is selected. In addition, the control unit 65 also transmits information related to the selected antenna 61 to the direction detection unit 64.

  Next, the control unit 65 instructs the communication unit 63 to transmit predetermined information. Thereby, the communication part 63 produces | generates the electromagnetic wave modulated based on the above-mentioned information, and outputs it via the selected antenna 61 (step S105).

Air conditioner 30 receives the radio wave emitted from the communication terminal 50 _1, to measure the electric field strength _{E N} of the radio wave (step S202). Then, information about the measurement result, and outputs to the communication terminal 50 ₁ (step S203).

Information about the field strength E _N through the communication unit 63 is transmitted to the direction detecting section 64. When the direction detection unit 64 receives the information on the electric field strength E _N from the communication unit 63, the direction detection unit 64 stores the electric field strength E _N and the information on the selected antenna 61 _N in association with each other.

When the communication unit 63 confirms that the information related to the measurement result of the electric field strength is received by the communication unit 63, the control unit 65 determines whether the counter value is 4 or more (step S106). When the counter value is smaller than 4 (step S106: No), the control unit 65 returns to step S103, and repeatedly executes the processing from step S103 to step S106 until the determination in step S106 is affirmed. Thus, the antenna _{61 2,} 61 3, 61 ₄ are sequentially selected, information about the field strength _{E 2,} E 3, _{E 4} of the electromagnetic wave outputted through each antenna 61 is output sequentially to the direction detection unit 64 The

On the other hand, when the counter value is 4 or more (step S106: Yes), the control unit 65 instructs the direction detection unit 64 to detect the direction in which the air conditioner 30 is located. When the direction detection unit 64 receives an instruction from the control unit 65, the information on the selected antennas 61 ₁ , 61 ₂ , 61 ₃ , 61 ₄ and the information on the electric field strengths E ₁ , E ₂ , E ₃ , E _4. And the direction in which the air conditioner 30 is located is detected. Specifically, the value from among the electric field strength _{E 1, E 2, E 3} , E 4 selects the highest electric field intensity _{E N.} Then, to identify the antenna 61 _N associated with the field strength E _N selected, the direction in which the antenna 61 _N faces, detected as the direction in which the air conditioning apparatus 30 is located.

For example, as can be seen with reference to FIG. 6, when the antenna corresponding to the maximum electric field strength E _N is the antenna 61 ₁ , the direction detection unit 64 sets the + Y direction to which the antenna 61 ₁ is directed to the air conditioner. The direction in which 30 is located is detected.

  When detecting the direction in which the air conditioner is located, the control unit 65 outputs information related to the detection result to the air conditioner 30 and ends the direction detection operation.

On the other hand, the air conditioner 30 identifies the direction in which the communication terminal 50 ₁ is located based on the detection result output from the control unit 65 of the communication terminal 50 _{1 with} the air conditioner 30 as a reference. Then, for example, the output is adjusted so that the conditioned air is discharged in the specified direction.

Similarly, the processing described above is executed between the communication terminals 50 ₂ , 50 ₃ and the air conditioner 30.

Moreover, the process similar to the process mentioned above is performed between the communication terminals 50 ₂ and 50 ₃ and the air conditioner 30 and between the communication terminals 50 ₁ to 50 ₃ and the lighting devices 40 ₁ to 40 ₄ . Thereby, it becomes possible to preferentially illuminate the direction in which the communication terminal is located.

As described above, in the present embodiment, the selected antenna 61 _{1-61 4} of the direction detection apparatus 60 constituting the communication terminal 50 is sequentially wave is outputted through the antenna 61, which is the selected. Next, the antenna 61 selected when the electric field intensity when the radio wave is received by the air conditioner 30 becomes maximum. Then, the direction in which the identified antenna 61 faces is detected as the direction in which the air conditioner 30 is located. Therefore, the air conditioner 30 can be efficiently controlled by adjusting the output of the air conditioner 30 based on the detected direction.

  According to the present embodiment, it is possible to detect the direction in which the air conditioner 30 is located without installing a receiving device or the like having a known positional relationship in the space where the air conditioner 30 is installed. Therefore, the configuration of the control system 10 can be simplified, and as a result, manufacturing costs and running costs can be reduced.

In the present embodiment, from among the antennas 61 ₁ to 61 ₄ with directional antenna facing the air conditioner 30 as a communication object is identified. Therefore, it is possible to reduce the frequency of interference by performing communication using the antenna.

In the present embodiment, the case where the direction in which the communication terminal 50 is located is detected based on the air conditioner 30 and the output of the air conditioner 30 is adjusted based on the detection result has been described. Not limited to this, when radio waves transmitted from the respective communication terminals 50 ₁ to 50 ₃ are received by the air conditioner 30, the communication terminal 50 that has transmitted the radio wave having the maximum electric field strength is identified, and the communication terminal 50 The air conditioner 30 may be operated based on the information output from.

In the present embodiment, the control unit 65 from the communication terminal 50 _N, after the direction search request signal Sd (N) is sent, after confirming the search permission signal Sp (N) that was received, the direction A series of operations for determination was performed. However, the direction search process may be executed without confirming the transmission of the direction search request signal Sd (N) and the reception of the search permission signal Sp (N).

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, about the structure same or equivalent to 1st Embodiment, while using an equivalent code | symbol, the description is abbreviate | omitted or simplified.

  FIG. 8 is a block diagram of a communication terminal 50A according to the second embodiment. The communication terminal 50A is different from the communication terminal 50 according to the first embodiment in that it includes an acceleration sensor 66.

  The acceleration sensor 66 detects the acceleration of the communication terminal 50 and outputs a signal α (t) corresponding to the detected acceleration.

  The control unit 65 performs an operation represented by the following calculation formula on the signal α (t) output from the acceleration sensor 66 to calculate the moving distance d of the communication terminal 50 at a predetermined interval (for example, every 5 seconds). To do. And the control part 65 performs a direction search process, when the moving distance of the communication terminal 50 becomes more than predetermined distance (for example, 3 m).

  Hereinafter, the operation of the control unit 65 will be described with reference to the flowchart shown in FIG. First, the control unit 65 executes a direction search process according to the procedure described in the first embodiment (step S301). Next, the control unit 65 measures ambient temperature and illuminance (sensing process), and outputs a measurement result as necessary (step S302). Next, the control unit 65 calculates the movement distance d of the communication terminal 50 by performing the calculation shown in the above equation, and when the movement distance d is larger than a threshold (for example, 3 m) (step S303: Yes), step S301 is performed. Return to, and perform the direction search process again. On the other hand, when the moving distance d is equal to or smaller than the threshold (step S303: No), the sensing process is performed in step S302 without executing the direction search process.

  As described above, in the present embodiment, the direction search process is executed only when the communication terminal 50 moves. Therefore, the energy consumed by the communication terminal 50 can be reduced. Thereby, for example, when the communication terminal 50 is driven by a battery, the consumption of the battery is suppressed, and the operation of the communication terminal 50 for a long time can be expected. In addition, since the direction search process is executed only when necessary, congestion of wireless communication between the communication terminal 50 and the air conditioner 30 is reduced.

<< Third Embodiment >>
Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, about the structure same or equivalent to the said embodiment, while using an equivalent code | symbol, the description is abbreviate | omitted or simplified.

Figure 10 is a perspective view showing the arrangement of antenna ₆₁ 1 to 61 ₄ of the present embodiment. As shown in FIG. 10, the direction detection device 60 of the communication terminal 50 </ b> B according to the present embodiment is different from the communication terminal according to the above-described embodiment in that it includes a shield 68.

Shield 68 from the antenna ₆₁ 1, 61 ₂ and antenna ₆₁ 3, 61 ₄ shielding plate 68a disposed between an antenna ₆₁ 1, 61 ₄ and the antenna ₆₁ 2, 61 ₃ arranged shield plates 68b between It is configured. Each of the shield plates 68a and 68b is made of carbon, ferrite or the like having excellent radio wave absorption.

  In the present embodiment, the radio wave emitted from each antenna 61 and reaching the adjacent antenna is attenuated. Further, when the incident angle of the radio wave incident on the shield plates 68a and 68b is large, the radio wave is reflected in the direction in which the antenna faces. For this reason, the directivity of each antenna in consideration of the shield 68 is a characteristic in which the sensitivity in the direction in which each antenna faces is further emphasized. As a result, the direction in which the communication terminal 50 is located can be detected more accurately.

<< Fourth Embodiment >>
Next, a fourth embodiment of the present invention will be described with reference to the drawings. In addition, about the structure same or equivalent to the said embodiment, while using an equivalent code | symbol, the description is abbreviate | omitted or simplified.

  FIG. 11 is a block diagram of a communication terminal 50C according to the fourth embodiment. The communication terminal 50 </ b> C is different from the above embodiments in that it includes an antenna rotation unit 67 instead of the antenna switching unit 62.

  The antenna rotating unit 67 has a motor 70 shown in FIG. The motor 70 is a stepping motor having a rotating shaft 70b to which an antenna 61 is fixed and a driving unit 70a that rotates the rotating shaft 70b about an axis S parallel to the Z axis. The antenna rotating unit 67 drives the motor 70 based on an instruction from the control unit 65 to direct the antenna 61 in a predetermined direction.

  When executing the direction search process, the control unit 65 first rotates the antenna 61 once through the antenna rotation unit 67 while sequentially changing the direction of the antenna 61 by 90 degrees, for example. At the same time, radio waves are emitted to the air conditioner 30 via the communication unit 63. Accordingly, data (d, E) including the antenna direction d and the electric field strength E is accumulated in the direction detection unit 64.

  The direction detection unit 64 specifies the direction d of the antenna when the electric field strength E is maximum from the accumulated data (d, E), and detects the direction in which the air conditioner 30 is located.

  As described above, in the present embodiment, the direction in which the air conditioner 30 is located can be detected without using a plurality of antennas. Therefore, the apparatus can be further simplified, and the manufacturing cost and running cost of the control system 10 can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited by said each embodiment. For example, in each of the above-described embodiments, as illustrated in FIG. 1, the case where the communication terminal 50 includes the direction detection device 60 has been described. Not only this but the air conditioner 30 may be provided with the direction detection apparatus 60, as FIG. 13 shows.

  In this case, the electric field intensity of the radio wave received by the communication terminal 50 is measured, and information related to the measurement result is output to the air conditioner 30 (steps S202 and S203). And the direction detection apparatus 60 of the air conditioner 30 performs a direction search process (step S101-S107).

  In the first embodiment, the case where the direction detection device 60 configuring the communication terminal 50 includes the four antennas 61 has been described. This is an example, and the direction detection device 60 may have, for example, five or more antennas. As the number of antennas included in the direction detection device 60 increases, the direction in which the air conditioner 30 or the like is located can be detected with higher accuracy.

  In the fourth embodiment, the case where the antenna rotating unit 67 rotates the antenna 61 by 90 degrees has been described. For example, the antenna 61 may be rotated by 30 ° or 45 °. Thereby, it is possible to accurately detect the direction in which the air conditioner 30 or the like is located.

In the second embodiment, the direction search process is executed when the movement distance of the communication terminal 50 calculated based on the output from the acceleration sensor 66 is equal to or greater than the threshold value. However, the direction search process may be executed when a state in which the output from the acceleration sensor 66 is equal to or greater than the threshold value continues for a predetermined time. For example, when the state in which the acceleration sensor 66 detects an acceleration of 9.8 m / s ² or more continues for 5 seconds or more, the direction detection device 60 may perform the direction detection process.

  In the above embodiment, the case where the control system 10 includes the three communication terminals 50 has been described. The control system is not limited to this, and may include two or less or four or more communication terminals 50. Similarly, two or more air conditioners 30 may be provided.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  The direction detection device of the present invention is suitable for detecting the direction in which the reception device that receives the radio wave from the direction detection device is located. Moreover, the air conditioner and air conditioning system of this invention are suitable for the air conditioning of a living space.

DESCRIPTION OF SYMBOLS 10 Control system 30 Air conditioner 31 Communication part 32 Output control part 40 Illumination device 41 Communication part 42 Light control part 50,50A-50C Communication terminal 60 Direction detection apparatus 61 Antenna 62 Antenna switching part 63 Communication part 64 Direction detection part 65 Control part 66 Acceleration sensor 67 Antenna rotating part 68 Shield 68a, 68b Shield plate 70 Motor 70a Drive part 70b Rotating shaft 100 Space SW selection switch

Claims (7)

A direction detection device that detects a direction in which a plurality of communication devices are located and transmits information indicating the detected direction used for controlling the plurality of communication devices to the plurality of communication devices ,
A plurality of antennas having different directivities, and
Selecting means for sequentially selecting one antenna from the plurality of antennas;
An output means for sequentially outputting radio signals to the plurality of communication devices via each antenna selected by the selection means;
Communicates with a plurality of the communication device, a communication means for receiving information indicating a strength the communication device receives each radio signal the output means has outputted from each of the communication device,
Direction detection means for detecting the direction in which each of the communication devices is located, based on information received by the communication means,
When the communication unit receives the information from the communication device, the selection unit switches the antenna selected from the plurality of antennas to another antenna among the plurality of antennas,
The output means, when switching the antenna selected by the selection means, outputs a radio signal to the communication device via the antenna switched by the selection means,
The direction detection unit identifies an antenna having the strongest radio signal intensity received by the communication device from the plurality of antennas based on information received by the communication unit, and determines the directivity of the identified antenna. Based on which the communication device is located.
Direction detection device. Comprising movement detection means for detecting movement of the direction detection device;
The direction detection device according to claim 1, wherein the direction detection unit detects a direction in which the communication device is located when movement is detected by the movement detection unit.   The direction detection device according to claim 1, wherein a shield that attenuates radio waves emitted from the antennas is disposed between the plurality of antennas.   The direction detection device according to claim 1, further comprising a rotation unit that rotates the antenna. Comprising a direction detecting device according to any one of claims 1 to 4, wherein the direction detecting means according to the detection result air conditioner that controls the air conditioner based on.   The air conditioner according to claim 5, wherein the communication device is a remote control device for inputting a command to the air conditioner. A plurality of air conditioners;
A remote control device comprising the direction detection device according to any one of claims 1 to 4, and a command for inputting commands to the plurality of air conditioners;
Air conditioning system equipped with.

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