JP3788829B2 - Receiving side wiring device used for indoor remote control system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an indoor remote control system that can remotely control a conduction state between a load and a power source of various lighting fixtures provided in a room by using a control radio wave such as an FM wave, and in particular, a remote control switch. The present invention relates to a receiving-side wiring device that receives a control radio wave transmitted from a receiver and controls a conduction state between a load and a power source.
[0002]
[Prior art]
In general, an indoor wiring structure is used in which loads of various lighting fixtures and electrical equipment provided indoors are controlled to be turned on and off by a switch device provided on a wall surface. However, since this type of switch device is installed at a low position on the indoor wall surface that is easy for humans to operate, it may limit the degree of freedom of arrangement of various indoor products such as cabinets, desks, and bookshelves. In particular, when changing the indoor layout, the switch device often limits the degree of freedom.
In addition, it took a lot of work to construct the electrical wiring from the verification device provided on the ceiling surface to the switch device installed on the wall surface by lowering the inside of the wall surface.
[0003]
Therefore, install a receiving-side wiring device with a switch function on a place that has little influence on the indoor layout, for example, the ceiling surface, and turn on loads such as various lighting fixtures and electrical equipment by remote control using a remote control switch. An indoor remote control system for OFF control has been proposed.
[0004]
Conventional indoor remote control systems use an infrared signal as a control signal (see, for example, Japanese Patent Laid-Open No. 3-102797), or use a radio wave signal such as an FM wave (for example, Japanese Patent Laid-Open No. 4-87500). Issue gazette). Among these, the indoor remote control system using infrared signals has a narrow infrared radiation angle, so it is necessary to operate the remote control switch from a position substantially opposite to the light receiving element provided on the receiving side wiring device. Had problems.
Therefore, in recent years, an indoor remote control system using a radio wave signal such as an FM wave having a wider radiation angle than an infrared signal has attracted attention.
[0005]
[Problems to be solved by the invention]
A receiving antenna for receiving a radio signal emitted from a remote control switch is attached to a receiving side wiring device constituting an indoor remote control system using this type of radio signal. Since it is formed of a thin conductor having a linear shape or a belt shape, when the receiving side wiring device is installed on the indoor ceiling or the like, the receiving antenna may be damaged by a tool.
Such damage to the receiving antenna reduces the performance of the receiving antenna. Therefore, careful attention is required for the installation work of the receiving side wiring device, which makes the installation work complicated and delays the work.
[0006]
Also, although radio wave signals such as FM waves have a wider radiation angle than infrared signals, if the directivity characteristics of the receiving antenna that receives the radio wave signals are narrow, a remote control switch is also placed in the directivity area of the receiving antenna. Need to be operated.
Therefore, it has been desired to develop a receiving side wiring device including a receiving antenna having a wide directivity that can be satisfied in terms of operability.
[0007]
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a receiving-side wiring device that can be easily installed without damaging the receiving antenna.
Another object of the present invention is to provide a receiving-side wiring device that has a wide directivity for receiving radio signals and can operate a remote control switch from various locations in the room.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a receiving side wiring device according to the present invention is provided with a case body, a storage cover mounted on the back surface of the case body, and a storage cover, to which a power source and a plurality of loads are connected. A connection terminal group, a receiving antenna that is mounted on the front surface of the case body and receives the control radio wave sent from the remote control switch, and a connection terminal that is provided on the back surface of the case body and that is received based on the control radio wave received by the receiving antenna A reception control circuit that controls a conduction state between a power source connected to the group and a plurality of loads, a power supply circuit that is housed in the housing cover and supplies power to the reception control unit, and a case main body that is fastened A mounting hole for fixing the case body to the wall surface of the room using a tool, an antenna cover for covering the surface of the receiving antenna mounted on the front surface of the case body, and the front surface of the case body It is mounted, and a decorative plate for covering at least the surface of the mounting hole and the antenna cover.
[0009]
The receiving side wiring device having the above-described configuration is installed on a ceiling or the like in the room by inserting a fastener such as a screw into a mounting hole provided in the case body. At this time, the receiving side wiring device has a receiving antenna mounted on the front surface of the case body in advance, and the surface of the receiving antenna is covered with an antenna cover.
Thereby, since the receiving antenna is protected by the antenna cover, there is no possibility of damaging the receiving antenna with a tool during installation work. Therefore, the operator can proceed with the installation work quickly without worrying about the receiving antenna.
[0010]
The receiving side wiring device of the present invention is characterized in that a receiving antenna as a component thereof is configured as follows.
That is, the receiving antenna is formed by forming a linear or band-like conductor in a loop shape with both ends facing each other at a predetermined interval, and the first antenna element having one end as a feeding point and the linear or band-like conductor at both ends. Are formed in a loop shape facing each other at a predetermined interval, are arranged coaxially in the same plane as the first antenna element and inside the first antenna element, and both ends thereof are opposite to both ends of the first antenna element. A second antenna element arranged substantially side by side and a connecting conductor portion made of a linear or strip-like conductor and electrically connecting the other ends of the antenna elements are provided.
[0011]
Here, the distance (D) between the center points of each antenna element is formed so as to have a relationship of D <0.01L with respect to the total conductor length (L) of each antenna element and the connecting conductor portion. It is preferable.
[0012]
In the receiving antenna, a reactance element may be inserted in series between the first and second antenna elements.
On the other hand, the receiving antenna can also form a minute gap near the other end of the first or second antenna element. This minute gap may be formed in the vicinity of the position of L / 4 from the feeding point with respect to the total length (L) of the conductor lengths of the antenna elements and the connection conductor portions.
In the receiving antenna, the width of the first antenna element is preferably larger than the width of the second antenna element.
[0013]
Furthermore, the receiving side wiring device of the present invention is provided with a state display element for emitting and displaying a conduction state between the load connected to the connection terminal group and the power source in the reception control circuit, and on the front surface of the case body, A display confirmation window that enables the state display element to be visually recognized from the outside can be provided.
[0014]
Furthermore, the receiving side wiring device of the present invention is connected to the receiving control circuit with respect to a plurality of types of control radio waves transmitted from the remote control switch, and the continuity between the load connected to the connection terminal group and the power source. A setting switch is provided to set the control details arbitrarily. A setting operation window that allows the setting switch to be operated from the outside is formed on the front of the case body, and the setting operation window is openable and closable. A door may be attached.
In this case, it is preferable to provide an opening / closing regulating means for maintaining the dustproof door in a fully open state or a fully closed state.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 are exploded perspective views showing the entire structure of a receiving side wiring device according to an embodiment of the present invention, and FIG. 3 is a front sectional view of the same device.
[0016]
As shown in these drawings, the receiving-side wiring device according to this embodiment includes a disc-shaped case main body 100, a receiving antenna substrate 200, an antenna cover 300, a decorative plate 400, and a storage cover 500. The receiving antenna substrate 200 is mounted on the front surface of the case body 100, and the surface of the receiving antenna substrate 200 is covered with the antenna cover 300. The decorative plate 400 is attached to the front surface of the case main body 100 and covers an area excluding the central portion of the front surface of the case main body 100. The storage cover 500 is attached to the back side of the case body 100.
[0017]
4 to 6 are views showing the structure of the case body, FIG. 7 is a plan view of the receiving antenna board, FIG. 8 is a bottom view of the antenna cover, and FIG. 9 is a plan view of the decorative plate.
As shown in FIGS. 1 and 7, the receiving antenna substrate 200 has a structure in which a receiving antenna 210 is formed on an annular substrate body 201 made of glass epoxy resin by etching or the like. A part of the substrate body 201 is formed with a lead part 202 extending inward in the radial direction, and a lead conductor 203 led from the feeding point of the receiving antenna 210 is formed on the lead part 202.
[0018]
As shown in FIGS. 1, 3, 4 to 6, the case main body 100 has an antenna housing portion 101 formed in an annular groove in the vicinity of the outer peripheral edge of the front surface. A substrate 200 can be placed. In addition, a substrate insertion hole 102 communicating with the back surface side is formed on a part of the inner wall of the antenna housing portion 101, and by inserting the lead-out portion 202 of the reception antenna substrate 200 into the substrate insertion hole 102, The leading end of the lead conductor 203 can be arranged on the back side of the case body 100.
[0019]
As shown in FIG. 8, the antenna cover 300 is formed in an annular shape corresponding to the receiving antenna substrate 200, and an extension portion 301 extending inward in the radial direction is provided in part. Locking claws 302 are formed at two arbitrary locations on the outer peripheral edge of the antenna cover 300. The case main body 100 has engaging groove portions 103 formed at two locations corresponding to the locking claws 302. By engaging the locking claws 302 with these engaging groove portions 103, the antenna housing portion 101 is formed. An antenna cover 300 is attached to the front surface of the. The antenna cover 300 attached in this way covers the surface of the receiving antenna substrate 200 arranged in the antenna housing portion 101. The extension 301 is inserted into the board insertion hole 102 and covers the lead-out part 202 and the lead-out conductor 203 of the receiving antenna board 200.
[0020]
In addition, positioning recesses 303 are formed on the outer peripheral edge of the antenna cover 300 at any two locations different from the locking claws 302, while the case body 100 is positioned to engage with the positioning recesses 303. A convex portion 104 is formed. Then, when the antenna cover 300 is attached, the positioning cover 303 is engaged with the positioning protrusions 104 of the case main body 100 to prevent the antenna cover 300 from rattling and displacement.
The antenna cover 300 can protect the reception antenna 210, and there is no possibility of damaging the reception antenna 210 with a tool or the like when installed on the indoor ceiling or wall surface.
[0021]
A mounting hole 105 is formed inside the antenna housing 101 in the case main body 100, and a fastener such as a screw is inserted into the mounting hole 105 to fix the case main body 100 to the indoor ceiling or wall surface. Can do.
[0022]
The decorative plate 400 has a flat dome shape with an opening at the center, and locking claws 401 are formed at two locations on the inner peripheral surface as shown in FIG. Corresponding to these locking claws 401, an engagement protrusion 106 is formed on the outer peripheral edge of the case body 100, and the decorative plate 400 is fixed by locking the locking claw 401 to the engagement protrusion 106. The case body 100 can be attached to the front surface.
The decorative plate 400 can cover the area where the antenna cover 300 and the mounting hole 105 mounted on the front surface of the case body 100 are formed.
[0023]
On the other hand, a reception control unit 107 is formed in the central portion on the back side of the case body 100 (see FIG. 6), and a reception control circuit board 600 as shown in FIG. The reception control circuit board 600 constitutes a reception control circuit that controls the conduction state of a load and a power source connected to a plurality of connection terminals 700 described later, based on the control radio wave received by the reception antenna 210.
[0024]
As the reception control circuit board 600, a known reception control circuit board conventionally used in a remote control system for indoor wiring using a remote control switch can be used. In this embodiment, the known circuit board is used. In addition, a state display element 601 that emits and displays a conduction state between a load and a power source connected to a plurality of connection terminals 700 described later, and a plurality of types of control radio waves transmitted from a remote control switch. A setting switch 602 is provided for arbitrarily setting the control content of the conduction state between the load connected to the connection terminal 700 and the power source.
[0025]
In general, this type of reception control circuit board 600 includes a matching circuit and a receiving circuit, and the feeding point of the receiving antenna 210 is connected to the matching circuit via the lead conductor 203 described above. The control radio wave received by the receiving antenna 210 is input to the matching circuit for matching, and then sent to the receiving circuit to process a predetermined control operation.
[0026]
The state display element 601 is composed of an LED (light emitting diode), and is configured such that the state display element 601 corresponding to the load side connection terminal in the ON state emits light.
A display confirmation window 108 is formed in the center of the front surface of the case body 100 at a position facing the state display element 601, and the light emission state of the state display element 601 can be visually recognized from the outside through the display confirmation window 108. It is like that.
[0027]
Further, the setting switch 602 includes a plurality of changeover switches, and the correspondence relationship between a plurality of types of control radio waves transmitted from the remote control switch and the load side connection terminal to be controlled can be arbitrarily set by switching the changeover switch. It is configured.
A setting operation window 109 is formed in the center of the front surface of the case body 100 at a position facing the setting switch 602, and the setting switch 602 can be operated from the outside through the setting operation window 109. .
[0028]
A slide guide plate 110 having a structure as shown in FIG. 10 is attached to the rear side of the peripheral edge of the setting operation window 109, and the dustproof door 111 is further sandwiched between the slide guide plate 110 and the case body 100. It is provided. The dust door 111 opens and closes the setting operation window 109 and is slidable along the slide guide plate 110.
[0029]
The slide guide plate 110 is provided with a locking piece 110a having a spring property. When the dustproof door 111 is in a fully open state and a fully closed state with respect to the setting operation window 109, an engagement protrusion formed on the back surface of the dustproof door 111. (Not shown) can be engaged with the locking piece 110a to maintain this state. That is, an opening / closing regulating means for holding the dustproof door 111 in a fully opened state or a fully closed state is configured by the locking pieces 110a and the engagement protrusions (not shown).
By this opening / closing regulating means, the closed state of the setting operation window 109 by the dustproof door 111 is maintained to prevent the intrusion of dust into the inside, and when the setting switch 602 is operated, the open state of the setting operation window 109 is set. It can be held for easy operation.
[0030]
The storage cover 500 is formed in a box shape with one side opened. As shown in FIGS. 2 and 3, a connection terminal portion 501 is formed inside the storage cover 500, and a plurality of connection terminals 700 are mounted in the connection terminal portion 501. Each of these connection terminals 700 has a presser spring 701 and an operation button 702, and constitutes a so-called screwless terminal structure. To these connection terminals 700, wirings led from the load and the power source are connected.
[0031]
Further, the storage cover 500 stores a power supply circuit board 800 for supplying power to the reception control circuit board 600 described above (see FIG. 2). Similarly to the reception control circuit board 600, the power supply circuit board 800 can use a known power supply circuit board conventionally used in a remote control system for indoor wiring using a remote control switch.
[0032]
The receiving side wiring apparatus having the above-described configuration is installed on the ceiling or wall surface of the room, and receives the control radio wave transmitted from the remote control switch 900 as shown in FIG. Controls the connection between the connected load and power supply.
[0033]
Next, the configuration of the reception antenna 210 described above will be described in more detail.
As shown in FIG. 7, the receiving antenna 210 of this embodiment includes a first antenna element 1, a second antenna element 2, and a connection conductor portion 3.
[0034]
The first antenna element 1 and the second antenna element 2 are each formed by forming a band-like conductor into a loop shape in which both ends A, A ′, B, B ′ are opposed to each other with a predetermined interval. The second antenna element 2 is coaxially arranged inside the first antenna element 1 in the same plane, and both ends thereof are arranged side by side with substantially both ends of the first antenna element 1.
[0035]
Here, one end A of the first antenna element 1 is a feeding point, and a lead conductor is drawn from the one end A. Note that one end A ′ of the second antenna element 2 is an open end.
[0036]
The connection conductor portion 3 is also formed of a strip-like conductor like the antenna elements 1 and 2, and the connection conductor portion 3 electrically connects the other ends B and B ′ of the antenna elements 1 and 2. It is. Thereby, the receiving antenna 210 of the present embodiment constitutes a planar folded spiral structure that is integrally connected in the same plane.
[0037]
The receiving antenna 210 has a planar structure in which the side surfaces of the first antenna element 1 and the second antenna element 2 having a small area are opposed to each other. In this way, by setting the side surface having a small area as the opposing surface, the capacitance between the antenna elements 1 and 2 can be reduced, and accordingly, the distance D between the center points of the antenna elements 1 and 2 is reduced. can do.
As a result, the inner diameter of the second antenna element 2 located on the inner side can be increased, and a sufficient space for accommodating the electric circuit can be secured in the inner portion of the second antenna element 2.
[0038]
On the other hand, if the plane portions having a large area in the first antenna element 1 and the second antenna element 2 are opposed to each other, the capacitance between the antenna elements 1 and 2 is increased. D cannot be made too small.
[0039]
Further, by adopting a planar structure as in this embodiment, it becomes possible to produce a printed pattern on a substrate body 201 made of, for example, glass epoxy resin, and a product with uniform and stable dimensional accuracy is inexpensive. Can be manufactured at a low manufacturing cost.
[0040]
Next, the operation of the receiving antenna 210 will be described.
The directivity characteristics of a magnetic field antenna such as a spiral antenna are determined by the direction of the magnetic field strength generated by the current flowing through the conductor.
In the receiving antenna 210 configured as described above, when the distance D between the center points of the antenna elements 1 and 2 is sufficiently small, the length of the first antenna element 1 and the length of the second antenna element 2 are substantially equal.
[0041]
In addition, since the folded spiral structure is adopted, the phase of the current flowing through the first antenna element 1 and the current flowing through the second antenna element 2 can be equivalently brought close to the same phase. Therefore, a strong magnetic field strength can be obtained in the in-plane direction including the receiving antenna 210. That is, the directivity characteristic of the receiving antenna 210 according to this embodiment is an ellipse as shown in FIG.
[0042]
In general, under a usage pattern in which radio waves are emitted from an arbitrary position below a ceiling antenna, as shown in FIG. 12, the antenna (ANT) has an elliptical shape with a high gain in the oblique direction. A wider reception distance range can be obtained with an antenna having directivity characteristics.
Furthermore, since the radio waves are reflected in a complex manner on the surfaces of floors, walls, ceilings, furniture, etc., the influence of multipath is greater than outdoors. Therefore, from the viewpoint of minimizing the influence of the multipath, an antenna having a directivity as shown in FIG. 12 having a high gain ratio with respect to the reception direction of the directly incident wave is preferable.
[0043]
On the other hand, in the conventional spiral antenna 211 as shown in FIG. 13, since the outer conductor and the inner conductor are wound in the same direction, the phases of the currents flowing through them are almost opposite to each other. As a result of increasing the magnetic field strength in the direction perpendicular to the surface, the directivity is strong in the direction perpendicular to the spiral surface of the antenna (ANT) as shown in FIG.
[0044]
However, the current distribution and the phase relationship flowing through the antenna elements 1 and 2 in the receiving antenna 210 include the relationship between the total length L of the receiving antenna 210 and the operating frequency wavelength λ, the center point distance D of each antenna element 1 and 2, It changes in a complicated manner depending on the width W of the antenna elements 1 and 2.
[0045]
Therefore, an analysis example based on a reliable moment method is used as an antenna analysis method, and the structure and operation of the reception antenna 210 will be described in more detail.
FIG. 15 shows the ratio (L / λ) of the total length L to the specific wavelength λ used for the receiving antenna 210 (FIG. 15A) and the conventional spiral antenna 211 shown in FIG. 13 (FIG. 13B). Is a comparison of changes in directivity, gain (G), and input resistance (R).
[0046]
In the receiving antenna 210, the distance between the center points of the antenna elements 1 and 2 is D and the width is W. On the other hand, in the conventional spiral antenna 211, the distance between the center points of adjacent conductors is D. The width was set to W, and both D / L = 0.008 and W / L = 0.003 with respect to the total length L.
[0047]
As apparent from FIG. 15, when L / λ is changed, not only the gain (G) and input resistance (R) but also the directivity changes, but in the conventional spiral antenna 211, the change in directivity is spiral. The receiving antenna 210 according to the embodiment of the present invention has an advantage in the region where L / λ is relatively small, that is, for downsizing, while remaining within the range in the direction perpendicular to the surface ((b) in the figure). It can be seen that an elliptical directivity as shown in FIG. 17 is obtained when the conductor length L is large ((a) in FIG. 17).
[0048]
FIG. 16 shows a comparison of changes in gain (G) and input resistance (R) in a direction inclined by 30 ° from the loop surface or spiral surface of the antenna with respect to changes in L / λ under the same conditions as in FIG. It is.
From this figure, it can be seen that the gain (G) in the 30 ° direction is higher than that of the conventional spiral antenna 211 when L / λ is relatively small, that is, when the conductor length L is advantageous for miniaturization.
[0049]
Further, from the results of FIGS. 15 and 16 described above, considering the gain (G) and the input resistance (R), it is possible to form an efficient receiving antenna 210 by setting L / λ in the vicinity of 0.75. Become.
[0050]
Further, finely designed optimum design is possible by D / L and W / L. When D / L is increased, the region in which the directivity characteristics of FIG. 12 are obtained shifts in a direction where L / λ is small, and the gain also decreases at the same time.
Therefore, it is desirable that the distance D between the center points of the antenna elements 1 and 2 is such that D <0.01L with respect to the total length L.
[0051]
FIG. 17 shows a receiving antenna 210 (FIG. 17A) according to an embodiment of the present invention and an antenna (FIG. 16B) having a structure in which the dimensional conditions are the same and only the feeding method is changed. The comparison was made under the same conditions.
Here, for the antenna to be compared, one end of the first antenna element 1 and one end of the second antenna element 2 were used as feed points.
[0052]
In the same figure, areas indicated by Pa and Pb are areas where elliptical directivity characteristics as shown in FIG. 12 can be obtained, but the antenna area Pb having one end of each antenna element 1 and 2 as a feeding point is It can be seen that the degree of freedom of design is restricted and the gain is also low because the range is extremely limited to a small L / λ range as compared with the area Pa of the receiving antenna 210 according to this embodiment.
As described above, according to the receiving antenna 210 according to the embodiment of the present invention, a small gain and a thin structure can be obtained, and a high gain can be obtained in an oblique direction, and the receiving distance range can be efficiently expanded.
[0053]
FIG. 18 is a conceptual diagram showing a first modification of the receiving antenna.
In the receiving antenna 220 shown in the figure, the reactance element 6 is inserted in series in the intermediate portion of the receiving antenna 210 shown in FIG.
[0054]
In the structure of the receiving antenna 210 shown in FIG. 7, there may be a case where the desired total length L cannot be obtained as described above in actual design. In such a case, by inserting the reactance element 6 and adjusting the reactance as appropriate, the current phase difference between the antenna elements 1 and 2 can be made substantially the same, and thus the elliptical shape shown in FIG. Directional characteristics can be obtained.
[0055]
The insertion position of the reactance element 6 is preferably in the vicinity of the turning point by the connection conductor portion 3. The reactance element 6 in the second embodiment is inserted for the purpose of expanding the degree of freedom of design for obtaining a desired directivity, and assists the resonance of the antenna like an extension coil or a shortening capacitor. The purpose is different from the reactance element used in the above.
[0056]
FIG. 19 is a conceptual diagram showing a second modification of the receiving antenna.
The receiving antenna 230 shown in the figure is provided with a minute gap g in the vicinity of the turning point by the connecting conductor portion 3.
[0057]
FIG. 22 is a diagram comparing the receiving antenna 210 (FIG. 7A) shown in FIG. 7 and the receiving antenna 230 of the second modified example under the same conditions as in FIG.
By providing the minute gap g like the receiving antenna 230 of the second modification, it is possible to obtain the effect of reactance insertion due to the capacitance between the minute gaps g. In addition, the remaining part of the second antenna element 2 cut by the minute gap g becomes a parasitic element, and due to a synergistic effect with the phase of the current flowing through the mutual impedance with the first antenna element 1, FIG. As shown in FIG. 5, the L / λ region exhibiting high directivity in the in-plane direction is expanded.
It should be noted that an optimum design can be achieved by appropriately adjusting the position of the minute gap g in the vicinity of the turning point by the connecting conductor portion 3.
[0058]
FIG. 20 is a conceptual diagram showing a third modification of the receiving antenna.
In the receiving antenna 240 shown in the figure, a minute gap g is provided at a position near the circumferential distance Lg = L / 4 from one end A of the first antenna element 1.
An analysis example of the receiving antenna 240 is shown in FIG. As shown in FIG. 5C, the receiving antenna 240 can further widen the L / λ region that exhibits high directivity in the in-plane direction, and can also improve the gain characteristics.
As described above, the receiving antenna 230 and the receiving antenna 240 can greatly expand the degree of design freedom without using additional components such as the reactance element 6.
[0059]
FIG. 21 is a perspective view showing a fourth modification of the receiving antenna.
The receiving antenna 250 shown in the figure has the width Wa of the first antenna element 1 larger than the width Wb of the second antenna element 2 in the configuration of the receiving antenna 210 shown in FIG. In this way, by setting Wa> Wb, the transmission line impedance becomes stepwise different from the turning point by the connecting conductor portion 3 as a boundary. Therefore, a part of the reflected wave from the open end A ′ of the second antenna element 2 is reflected again toward the open end A ′ at the turning point, and the loss due to the reflected wave at the first antenna element 1 is reduced. Gain can be improved.
[0060]
FIG. 23B shows an example of analysis when Wb is about ½ of Wa. As can be seen from (b) of the figure, the gain is greatly improved.
Note that the structure of the reception antenna 250 of the fourth modification can also be applied to the reception antennas 220, 230, and 240 of the second to fourth modifications described above.
In the embodiment described above, the receiving antenna has a circular folded spiral structure, but the shape is not limited to this, and may be an elliptical shape or a polygonal shape.
[0061]
【The invention's effect】
As described above, according to the receiving-side wiring device of the present invention, installation work can be easily performed without damaging the receiving antenna.
In addition, since the receiving antenna includes the first antenna element, the second antenna element, and the connecting conductor portion according to claim 2, the receiving antenna has a wide directivity with respect to reception of radio signals, and can be remotely controlled from various places in the room. The switch can be operated.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a configuration of a receiving-side wiring device according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the configuration of the receiving side wiring apparatus according to the embodiment of the present invention.
FIG. 3 is a front sectional view of the apparatus.
FIG. 4 is a bottom view showing a case main body of the apparatus.
FIG. 5 is a front sectional view of the same.
FIG. 6 is a plan view of the same.
FIG. 7 is a bottom view showing a receiving antenna substrate of the apparatus.
FIG. 8 is a bottom view showing the antenna cover of the apparatus.
FIG. 9 is a plan view showing a decorative plate of the apparatus.
FIG. 10 is a bottom view showing a slide guide plate and a dustproof door of the apparatus.
FIG. 11 is a perspective view showing an external configuration example of a remote control switch that transmits a control radio wave to the receiving-side wiring device according to the embodiment of the present invention.
FIG. 12 is a diagram showing antenna directivity characteristics suitable for application to an indoor remote control system or the like.
FIG. 13 is a schematic diagram showing a conventional spiral antenna.
14 is a diagram showing directivity characteristics of the conventional spiral antenna shown in FIG.
FIG. 15 is a diagram for explaining the operation of the receiving antenna according to the embodiment of the present invention;
FIG. 16 is a diagram for explaining the operation of the receiving antenna according to the embodiment of the present invention, similar to FIG. 15;
FIG. 17 is a diagram for explaining the operation of the receiving antenna according to the embodiment of the present invention, similar to FIGS. 15 and 16;
FIG. 18 is a schematic diagram showing a first modification of a receiving antenna.
FIG. 19 is a schematic diagram showing a second modification of the receiving antenna.
FIG. 20 is a schematic diagram showing a third modification of the receiving antenna.
FIG. 21 is a schematic diagram showing a fourth modification of the receiving antenna.
FIG. 22 is a diagram for explaining the operation of the receiving antenna according to the second and third modified examples.
FIG. 23 is a diagram for explaining the operation of a reception antenna according to a fourth modification.
[Explanation of symbols]
1: First antenna element 2: Second antenna element
3: Connection conductor
100: Case body 105: Mounting hole
108: Display confirmation window 109: Setting operation window
110: Slide guide plate 110a: Locking piece
111: Dust-proof door
200: Reception antenna board 210: Reception antenna
300: Antenna cover 400: Cosmetic plate
500: Storage cover
600: Reception control circuit board 601: Status display element
602: Setting switch 700: Connection terminal
800: Power circuit board

Claims (10)

A case body, a storage cover attached to the back surface of the case body, a connection terminal group provided inside the storage cover to which a power source and a plurality of loads are connected, and a remote controller attached to the front surface of the case body A receiving antenna that receives a control radio wave sent from the switch; a power source and a plurality of loads that are provided on the back surface of the case body and connected to the connection terminal group based on the control radio wave received by the receiving antenna; A reception control circuit that controls a conduction state between the power supply circuit, the power supply circuit that is housed in the housing cover and supplies power to the reception control unit, and the case body is provided with a fastener. A mounting hole for fixing to the wall surface of the room, an antenna cover for covering the surface of the receiving antenna mounted on the front surface of the case body, and a small amount mounted on the front surface of the case body. Receiving side wiring apparatus used in the indoor remote control system for the Kutomo the attachment hole and cosmetic plate covering the surface of the antenna cover, by comprising the features. In the receiving side wiring device used for the indoor remote control system according to claim 1,
The receiving antenna is
A first antenna element having a linear or strip-like conductor formed in a loop shape whose opposite ends are opposed to each other at a predetermined interval;
A linear or belt-like conductor is formed in a loop shape whose both ends are opposed to each other with a predetermined interval, and is arranged in the same plane as the first antenna element and coaxially inside the first antenna element, A second antenna element having both ends substantially aligned with both ends of the first antenna element;
A receiving-side wiring device used for an indoor remote control system, comprising a connecting conductor portion made of a linear or strip-shaped conductor and electrically connecting each other end of each antenna element. In the receiving side wiring device used for the indoor remote control system according to claim 2,
The receiving antenna is
The distance (D) between the center points of each antenna element is formed so as to have a relationship of D <0.01L with respect to the total conductor length (L) of each antenna element and the connecting conductor portion. A receiving-side wiring device used for an indoor remote control system. In the receiving side wiring device used for the indoor remote control system according to claim 2 or 3,
The receiving antenna is
A receiving side wiring device used for an indoor remote control system, wherein a reactance element is inserted in series in an intermediate portion of the first or second antenna element. In the receiving side wiring device used for the indoor remote control system according to claim 2 or 3,
The receiving antenna is
A receiving side wiring device used for an indoor remote control system, wherein a minute gap is formed in the vicinity of the other end of the first or second antenna element. In the receiving side wiring device used for the indoor remote control system according to claim 2 or 3,
The receiving antenna is
Reception for use in an indoor remote control system characterized in that a minute gap is formed in the vicinity of a position L / 4 from the feeding point with respect to the total conductor length (L) of each antenna element and connecting conductor portion. Side wiring device. In the receiving side wiring device used for the indoor remote control system according to any one of claims 2 to 6,
A receiving-side wiring device used in an indoor remote control system, wherein the width of the first antenna element is larger than the width of the second antenna element. In the receiving side wiring device used for the indoor remote control system according to any one of claims 1 to 7,
The reception control circuit is provided with a state display element that emits and displays a conduction state between a load connected to the connection terminal group and a power source, and
A receiving-side wiring device used for an indoor remote control system, wherein a display confirmation window is provided on the front surface of the case body so that the state display element can be visually recognized from the outside. In the receiving side wiring device used for the indoor remote control system according to any one of claims 1 to 8,
For arbitrarily setting a control content for a conduction state between a load connected to the connection terminal group and a power source with respect to a plurality of types of control radio waves transmitted from the remote control switch in the reception control circuit. While providing a setting switch,
On the front surface of the case body, a setting operation window that allows the setting switch to be operated from the outside is formed,
A receiving side wiring device used for an indoor remote control system, wherein a dustproof door that can be opened and closed is mounted on the setting operation window. In the receiving side wiring device used for the indoor remote control system according to claim 9,
A receiving-side wiring device for use in an indoor remote control system, characterized in that opening / closing regulating means for holding the dustproof door in a fully open state or a fully closed state is provided.

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