JPH04347453A - Wireless remote controller - Google Patents

Abstract

PURPOSE:To provide a wireless remote controller operated under an application of electromagnetic wave in which the performance of a remote controller antenna is ensured in response to its mounting location. CONSTITUTION:A wireless remote controller is comprised of a hot water feeding machine 1, a remote transmitter/receiver 7 for transmitting or receiving a control signal under an application of electromagnetic wave, an antenna 6 for a remote controller, a plurality of matching parts 11, 12 having different matching values from each other in order to get impedance matching between this antenna and the remote controlled transmitter/receiver and a changing-over part 13 for selecting one of the plurality of matching parts. Since the selection of the matching parts capable of getting the impedance matching can be easily carried out through the changing-over part 13, a performance of transmitting/ receiving operation in the remote controlled device can be ensured.

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to a wireless remote control used in a water heater that heats water using gas, oil, electricity, etc., and particularly relates to an antenna matching section for obtaining a highly efficient antenna. It is.

2. Description of the Related Art In a conventional water heater of this kind, as shown in FIG. The remote control cable 14 extends through the remote control cable 14 and is connected to the water heater 1 , and the control signal from the remote control 5 is transmitted to the water heater 1 via the remote control cable 14 . In addition, as a wireless remote control, there is Japanese Utility Model Publication No. 57-77671,
A configuration has already been devised in which a water heater is remotely controlled using a wireless remote control that uses radio waves, and the status of the water heater is remotely monitored using a wireless remote control.

[Problems to be Solved by the Invention] However, in the configuration of the conventional remote control cable method described above, when installing a water heater, a hole 8a is made in the wall 8 and the remote control cable 14 consisting of 2 to 8 core signal wires is passed through the hole 8a. , the water heater 1 and the remote control 5 had to be connected. Therefore, there are problems in that it requires penetrating work through the wall and there is a fear that a connection error of the remote control cable 14 may occur. Also,
In the water heater using the wireless remote control described above, there is almost no disclosure regarding the specific configuration of the antenna and the matching part of the antenna for efficiently transmitting and receiving radio waves. However, in order to put this type of wireless remote control hot water heater into practical use, it is very important to find a way to easily match antennas and antennas at each installation location. The present invention solves the above problems and eliminates the need for drilling holes in walls and connecting cables, and also enables switching of the matching part in response to the characteristic impedance of the antenna affected by the surroundings of the installation location. Provide wireless remote control.

[Means for Solving the Problems] In order to solve the above problems, the wireless remote control of the present invention includes a remote control transmitting/receiving section that transmits and receives control signals using radio waves with the main body of the device, and an antenna provided on the housing of the remote control. , a plurality of matching sections having mutually different matching values for impedance matching between the antenna and the remote control transmitting/receiving section, and a switching section for selecting one of the plurality of matching sections.

[Operation] With the above configuration, the present invention can prevent the characteristic impedance of the antenna from changing due to the influence of the surroundings of the antenna due to the change in the mounting location of the remote control.
This can be achieved by switching the matching section and matching with the remote control transmitting/receiving section, so a wireless remote control with good antenna efficiency can be realized regardless of the installation location.

Embodiments An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, 1 is a water heater, 2 is a hot water transmitter/receiver, 3 is a water heater antenna, and 4 is a control unit for controlling the transmission and reception of hot water and for controlling the overall operation of the water heater 1. The water heater 1 is attached to a wall or the like and supplies hot water to various parts of the house through piping. Reference numeral 5 designates a remote controller (hereinafter referred to as a remote control) installed in a bathroom, kitchen, etc., 6 a rod-shaped remote control antenna led out from the remote control housing 5a, and 7 a remote control transmitting/receiving section. Radio waves emitted from the water heater antenna 3 and the remote control antenna 6 transmit data through the wall 8. With the above configuration, when a control signal operated by the remote controller 5 is transmitted as a radio signal to the water heater 1 side, the hot water supply transmitting/receiving section 2 receives it, and the control section 4 operates the water heater 1 based on the content of the control signal. It is something. Further, when the operating state of the water heater 1 is transmitted from the water heater transmitter/receiver 2 as a radio wave signal to the remote controller 5 side, the remote controller transmitter/receiver 7 receives the signal and displays it on the display section. FIG. 2 is a control block diagram of the water heater 1 and the remote controller 5. As shown in FIG. The remote control 5 is
remote control antenna 6, remote control transmitting/receiving section 7, display section 9,
The matching section consists of a first matching section 11 that can perform matching when the antenna is in free space, and a first matching section 11 that can perform matching when the antenna is near a wall or when the remote controller 5 is held in hand. It consists of two matching parts. The switching unit 13 selects either the first matching unit 11 or the second matching unit 12 inserted between the remote control antenna 6 and the remote control transmitting/receiving unit 7, and switches the connection. The remote control antenna 6 is a monopole antenna that is guided outward from the housing 5a of the remote control 5. In the above configuration, the remote control antenna 6 is a monopole antenna, and is often configured with a length of 1/4 wavelength or less for transmitting and receiving radio waves, and the size of the casing of the remote control 5 is also sufficient for the wavelength. not big. Furthermore, the remote control 5 is not grounded to the earth. Therefore, since the remote control antenna 6 does not have a sufficient ground plane, it is easily influenced by the surroundings of the antenna, and the characteristic impedance differs greatly when the remote control is mounted on a wall or held in the hand. In the embodiment, a first matching section 11 and a second matching section 12 are provided, and either one is selected by the switching section 13. This makes it possible to efficiently transmit signals from the antenna to the remote control transmitting/receiving section 7 for each installation location and transmitting signals from the remote control transmitting/receiving section 7 to the antenna, thereby improving the transmitting/receiving performance of the remote control.

[Effects of the Invention] As described above, according to the wireless remote control of the present invention, the following effects can be obtained. (1) Since it is possible to easily select a matching part that can match the characteristic impedance of the remote control antenna, which is easily affected by the surroundings of the installation location, an antenna with good transmission and reception efficiency can be provided without special adjustment techniques. (2) A practical remote control that does not require remote control cable construction can be provided.

[Brief explanation of drawings]

[Fig. 1] A configuration diagram of a water heater that employs an embodiment of the wireless remote control of the present invention.

[Figure 2] Control block diagram of the water heater and water heater remote control

[Figure 3] External view of a conventional water heater

[Explanation of symbols]

5 Remote control 6. Remote control antenna 7 Remote control transmitter/receiver 11 First matching part 12 Second matching part 13 Switching section

Claims (1)

[Claims] 1. A remote control transmitting/receiving section that transmits and receives control signals using radio waves; an antenna guided to the inside or outside of a housing of the remote controller; and an antenna inserted between the antenna and the remote control transmitting/receiving section to achieve impedance matching. A wireless remote control comprising a plurality of matching sections having mutually different matching values, and a switching section for selectively connecting any one of the plurality of matching sections.