JP5297301B2 - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system with small size and capable of reducing efficiently electromagnetic noises. <P>SOLUTION: An electromagnetic shield-cum-heat sink 2 is arranged between a control substrate 3, equipped with a communication control part 32 and a light source control part 31, and a light source substrate 1 mounted with a light source part 11; and a through hole 21 is installed at the end part of this electromagnetic shield-cum-heat sink 2. Here, a power supply wire 60 to connect the power supply part and the light source part 11, and a signal wire 61 to connect the light source control part 32 and the light source part 11 are inserted in the through hole 21. Since the electromagnetic shield-cum-heat sink 2 covers almost the light source substrate 1, electromagnetic noises emitted from the light source part 11 are almost shielded by the electromagnetic shield-cum-heat sink 2, and the electromagnetic noises hardly reach the communication control part 32. Further, each of the wires 60, 61 are inserted in a ferrite core 62 for noise countermeasures, high frequency noises of each of wires 60, 61 are reduced. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an illumination device having a remote control function by radio wave communication.

  2. Description of the Related Art Conventionally, there has been proposed an illumination device that includes a receiving unit that receives radio waves of a predetermined frequency and that remotely controls the lighting state of a light source by radio wave communication. In addition, many lighting devices using light emitting diodes as light sources have been put into practical use, and the above-described remote control function by radio wave communication is also installed in such lighting devices.

  Since the illumination device as described above uses radio wave communication, there is an advantage that signals can be transmitted and received even when the transmission unit and the reception unit are not facing each other. On the other hand, electromagnetic noise in the communication frequency band generated from light-emitting diodes that are light sources and electric wires that supply power from the power source to the light sources affects the communication control circuit that controls radio wave communication, resulting in degraded communication performance. There was a problem that there is a risk of doing. In addition, since light emitting diodes have a decrease in light emission efficiency and life under high temperature conditions, it is necessary to take measures against heat radiation from the light source.

  As a method of performing the above-described electromagnetic noise countermeasure and heat dissipation simultaneously, there is a method using a heat / electromagnetic noise countermeasure component, for example, as described in Patent Document 1, in which a heat conductor is covered with a metal sheet. . In this conventional example, noise removal and heat dissipation by the shielding effect can be simultaneously performed by bringing the light source close to a light source that is a source of heat and electromagnetic noise. Further, as a countermeasure against electromagnetic noise radiated from the electric wire, it is conceivable to insert the electric wire through a ferrite core for noise countermeasure to remove the high frequency noise of the electric wire. Patent Document 2 describes a ferrite core mounting structure in which a ferrite core is integrally formed on a connector of an electric wire as a method of mounting a noise countermeasure ferrite core without taking up space.

  Further, as shown in FIG. 5, a light source unit (not shown) having a light emitting diode (not shown) and a dimming circuit (not shown) and an antenna 12 for receiving radio waves are mounted on the lower surface. The dimming circuit is formed on the basis of the radio wave received by the antenna 1 and the electromagnetic shield / heat radiation plate 2 having conductivity, which is thermally coupled to the light source substrate 1 through the substrate 1 and the heat conductive sheet 20. A control board 3 including a control circuit 30 that transmits a lighting control signal and controls lighting and extinction of the light source unit; a power supply board 4 including a power source unit that supplies power to the light emitting diode; A power supply wire 60 connecting the power supply unit and the light source unit, a signal wire 61 connecting the control circuit 30 and the light source unit, a ground wire 62 for grounding the light source unit, the antenna 12 and the control Connect to circuit 30 Proposal is also made of an illuminating device comprising an antenna wire 63, a light source substrate 1, an electromagnetic shielding and heat radiating plate 2, a control substrate 3, and a power supply substrate 4 stacked in the thickness direction and housed therein. Has been. Each electric wire 60, 61, 62 of this conventional example is connected to the light source part 11 via a connector 65 with a noise countermeasure ferrite core, and the right end portion of the electromagnetic shielding and heat radiating plate 2 is connected to each electric wire 60, 61. , 62 are cut out in an arcuate shape so that they can be disposed.

  In this conventional example, the electromagnetic noise radiated from the light source unit 11 is shielded by the electromagnetic shield / heat radiating plate 2, so that it is difficult to reach the control circuit 30. Moreover, since the high frequency noise in each electric wire 60, 61, 62 is converted into heat by the connector 65 with a noise countermeasure ferrite core, the electromagnetic noise radiated from each electric wire 60, 61, 62 can be reduced. .

JP 2001-326492 A JP 2001-185891 A

  By the way, miniaturization and slimming of the lighting device is a market need, but in order to realize this, it is necessary to arrange components without a gap inside the small case. In other words, in this case, the light source or electric wire that is a noise source and the communication control circuit must be very close to each other. However, electromagnetic noise is stronger as the distance from the noise source is shorter, so if the distance between the noise source and the communication control circuit is closer, even if noise countermeasures are taken as in the previous example, the noise level is reduced. May adversely affect the communication control circuit.

  Therefore, it is necessary to further enhance the noise countermeasure effect under the space-saving condition.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an illuminating device in which the radio communication performance is less likely to deteriorate due to the influence of electromagnetic noise.

  In order to achieve the above object, the invention of claim 1 includes a light source unit including an antenna that receives radio waves of a predetermined frequency, one or a plurality of light emitting diodes, and a dimming circuit that adjusts the light amount of the light emitting diodes. A light source substrate mounted on the side surface, a communication control unit that processes radio waves received by the antenna and outputs a control signal, and a light source control that controls the dimming circuit according to a control signal from the communication control unit A control substrate disposed opposite to the other side surface of the light source substrate, and the other side surface of the light source substrate between the light source substrate and the control substrate. An electromagnetic shield and heat dissipation plate having conductivity and thermal conductivity, disposed so as to cover and thermally couple with the light source substrate, and a power supply substrate including a power supply unit that supplies power to the light source unit The power supply unit and the light source A power supply wire connecting the light source control unit and the light source unit, a signal wire connecting the light source control unit and the light source unit, the light source substrate, the electromagnetic shield combined heat dissipation plate, the control substrate, and the power supply substrate, A housing that is stacked in the thickness direction and accommodated therein, and an insertion hole through which at least the power supply wire is inserted among the power supply wire and the signal wire is penetrated by the electromagnetic shielding and heat dissipation plate, At least the power supply wire out of the power supply wire and the signal wire is inserted through an axial center of a cylindrical noise countermeasure ferrite core disposed between the electromagnetic shielding and heat radiating plate and the control substrate. It is characterized by being.

  In the first aspect of the present invention, the light source substrate, the electromagnetic shield combined heat dissipation plate, the control substrate, and the power supply substrate are stacked in layers, and the electromagnetic shield combined heat dissipation plate is provided with an insertion hole through which at least the power supply wire is inserted. doing. As a result, the notched portion of the heat radiation plate serving as an electromagnetic shield can be made smaller than before, and almost the entire surface of the light source substrate can be covered with the heat radiation plate serving as an electromagnetic shield. Therefore, it is possible to prevent electromagnetic noise radiated from the light source unit from reaching the communication control unit. Further, since at least the power supply wire is inserted through the noise countermeasure ferrite core, the high frequency noise flowing through the wire is converted into heat by the noise countermeasure ferrite core. Therefore, electromagnetic noise generated from the electric wire can be reduced.

  According to a second aspect of the present invention, in the illuminating device according to the first aspect, the ferrite core for noise suppression is in close contact with the heat radiation plate also serving as an electromagnetic shield.

  According to the second aspect of the present invention, the high-frequency noise converted into heat by the noise-protecting ferrite core is released to the electromagnetic shielding and heat radiating plate by bringing the noise countermeasure ferrite core into close contact with the electromagnetic shielding and radiating plate. Thereby, the high frequency noise of the power supply wire (and the signal wire) can be stably removed.

  According to a third aspect of the present invention, in the illuminating device according to the first or second aspect, the electric wire inserted into the ferrite core among the electric power supply wire and the signal electric wire is an axis of the noise countermeasure ferrite core. It is wound around the ferrite core for noise suppression along the direction, and is inserted through the axis of the ferrite core for noise suppression a plurality of times.

  In the invention of claim 3, the impedance of the noise countermeasure ferrite core is increased by inserting the power supply wire (and the signal wire) through the shaft center of the noise countermeasure ferrite core a plurality of times. Thereby, the noise removal effect of the ferrite core for noise countermeasures can be improved.

  According to a fourth aspect of the present invention, in the illuminating device according to any one of the first to third aspects, the insertion hole is formed at an end of the electromagnetic shielding and heat radiating plate, and the light source control unit is the control board. The communication control unit is disposed in a region on the other end side away from the insertion hole in the control board, and is disposed in a region on one end side close to the insertion hole. To do.

  In the invention of claim 4, electromagnetic noise radiated from the power supply wire or the like is difficult to reach the communication control unit by spatially separating the power supply wire or the like from the communication control unit. Therefore, the influence of electromagnetic noise on the communication control unit can be suppressed.

  The present invention can provide a lighting device that is less likely to deteriorate radio communication performance due to the influence of electromagnetic noise.

It is a perspective view of the embodiment of the present invention. (A), (b) is a schematic diagram which respectively shows the structure of the penetration hole 21 of the electromagnetic shielding and heat sink 2 concerning the same. It is a side view of the board | substrate 3 for control concerning the same as the above, and the board | substrate 1 for light sources. (A), (b) is a schematic diagram when the noise countermeasure ferrite core 64 is brought into close contact with the electromagnetic shielding / radiating plate 2 and the power supply wire 60 is inserted into the insertion hole 21. It is a perspective view of a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. However, in the following description, the vertical and horizontal directions in FIG. 1 are defined as the vertical and horizontal directions.

  In this embodiment, a substantially disk-shaped light source substrate 1, an electromagnetic shielding / radiating plate 2, a control substrate 3 on which a control circuit 30 is mounted, and a power supply substrate 4 are stacked inside a cylindrical housing 5. Thus, it is configured to be stored.

  Although not shown, the power supply substrate 4 is mounted with a power supply circuit (power supply unit) that converts alternating current power from a commercial power source into direct current power and supplies lighting power.

  On the lower surface of the light source substrate 1, light emitting diodes (hereinafter referred to as LEDs) 10 that are uniformly arranged so that light is uniformly applied to the lower space of the housing 5, and the amount of light of the LEDs 10 is adjusted. A light source unit 11 having a dimming circuit (not shown) is mounted. For example, the dimming circuit includes a parallel circuit that can switch a plurality of paths having different resistance values and is connected in series to the LED 10, and is controlled by a light source control unit 31 described later. The light source unit 11 is connected to the power source unit via a power source wire 60, and is connected to a light source control unit 31 of the control circuit 30 described later via a signal wire 61, and via a ground line 62. Grounded externally. An antenna 12 that receives radio waves of a predetermined frequency transmitted from a control remote controller is mounted on the left end of the lower surface of the light source substrate 1.

  On the upper surface of the light source substrate 1, a heat conductive sheet 20 made of silicon resin or the like and an electromagnetic shield / heat radiating plate 2 made of a metal such as copper having substantially the same shape as the bottom surface of the housing 5 are stacked and adhered. In this state, the upper surface of the light source substrate 1 is substantially covered and fixed. As shown in FIG. 2, an insertion hole 21 through which the electric wires 60, 61, 62 are inserted is provided at the right end of the electromagnetic shield / heat sink 2, and the right end of the electromagnetic shield / heat sink 2 is Slightly cut into a bow. As described above, the insertion hole 21 through which the electric wires 60, 61, 62 are inserted is penetrated through the heat radiation plate 2 serving both as an electromagnetic shield, so that the cutout portion at the right end of the heat radiation plate 2 serving as an electromagnetic shield is made smaller than in the conventional example. It is possible to cover almost the entire upper surface of the light source substrate 1 with the electromagnetic shield / heat sink 2. In addition, the structure of the said insertion hole 21 may be a shape which lets each electric wire 60, 61, 62 pass one by one as FIG. 2 (a), or each electric wire 60, The shape which lets 61 and 62 pass collectively may be sufficient.

  A control circuit 30 having a light source control unit 31 and a communication control unit 32 is disposed on the control board 3.

  The communication control unit 32 is connected to the antenna 12 via the antenna electric wire 63, and controls the light source control unit 31 to turn on / off the light according to the radio signal from the control remote controller received by the antenna 12. Is output. The light source control unit 31 controls the dimming circuit via the signal wire 61 in accordance with a control signal from the communication control unit 32, and adjusts the light amount of the LED 10 by switching the path of the dimming circuit, for example. . In the present embodiment, as shown in FIG. 3, the light source control unit 31 that controls the light source unit 11 communicates with the antenna 12 on the right side of the control board 3 close to the electric wires 60, 61, 62. The control unit 32 is disposed on the left side of the control board 3 with a gap therebetween, and the communication control unit 32 and the electric wires 60, 61, 62 are spatially separated.

  The electric wires 60, 61, 62 are arranged at the axial center of a cylindrical noise countermeasure ferrite core (hereinafter simply referred to as a ferrite core) 64 disposed between the electromagnetic shield / heat sink 2 and the control board 3. It is inserted. Here, as shown in FIG. 4, the electric wires 60, 61, and 62 are inserted through the ferrite core 64 and the insertion hole 21 from the upper side to the lower side, and then turned upward to be used as an electromagnetic shield heat sink. 2 is passed through the side of the electromagnetic shield / heat sink 2 and the ferrite core 64 through the bow-shaped cutout portion 2, and is again inserted from above into the insertion hole 21 of the ferrite core 64 and the electromagnetic shield / heat sink 2. . In this case, the impedance of the ferrite core 64 is increased by increasing the number of turns of each of the electric wires 60, 61, 62, and the number of turns may be arbitrarily determined according to the required impedance. When the electric wires 60, 61, 62 are not turned (inserted through the ferrite core 64 only once), it is not necessary to form an arcuate cutout at the right end of the electromagnetic shield / heat sink 2. Further, the ferrite core 64 through which the electric wires 60, 61, 62 are inserted is adhered to the electromagnetic shielding / radiating plate 2 as shown in FIG. 4 (a) or electromagnetically as shown in FIG. 4 (b). By fitting into a fitting hole 22 provided in the shield-use heat radiating plate 2, it is brought into close contact with the electromagnetic shield-use heat radiating plate 2.

  Hereinafter, the operation of the present embodiment will be described.

  When this embodiment is operated, each LED 10 emits light, and heat and electromagnetic noise are generated from each LED 10. Further, electromagnetic noise is also radiated from the electric wires 60, 61, 62. The arrows in FIG. 3 schematically show these electromagnetic noises.

  In the present embodiment, the heat released from the light source unit 11 is transmitted to the heat shield 2 serving as the electromagnetic shield via the heat conductive sheet 20, and is released from the heat sink 2 serving as the electromagnetic shield to the outside. Further, among the electromagnetic noises radiated from the light source unit 11 when the device is turned on, the electromagnetic noises radiated upward from the light source unit 11 are, as shown by the arrows in FIG. Since it is almost shielded by 2, it is difficult to reach the control board 3.

  Moreover, in this embodiment, since each electric wire 60, 61, 62 is inserted in the ferrite core 64, the high frequency noise of each electric wire 60, 61, 62 is converted into heat. Therefore, the electromagnetic noise radiated | emitted from each electric wire 60, 61, 62 is reduced. In addition, since the ferrite core 64 is brought into close contact with the heat radiation plate 2 serving as an electromagnetic shield, high-frequency noise converted into heat by the ferrite core 64 is released to the heat radiation plate 2 serving as an electromagnetic shield. The electromagnetic noise from each electric wire 60, 61, 62 can be cut efficiently. Further, by separating the electric wires 60, 61, 62 and the communication control unit 32, electromagnetic noise radiated from the electric wires 60, 61, 62 is difficult to reach the communication control unit 32.

  With the configuration as described above, this embodiment can suppress deterioration in communication performance of the communication control unit 32 due to electromagnetic noise radiated from the LED 10 and the electric wires 60, 61, 62.

  In this embodiment, the lighting device that is remotely controlled by the radio remote controller has been described. However, the technical idea of the present invention has a transmission circuit and a transmission / reception antenna, and is reflected by radio waves and objects transmitted from the transmission / reception antenna. The present invention can also be applied to a radio wave sensor-equipped lighting device that includes a human sensor that detects the presence or absence of a moving body from the frequency difference between reflected waves.

DESCRIPTION OF SYMBOLS 1 Light source board | substrate 10 Light emitting diode 11 Light source part 12 Antenna 2 Electromagnetic shield combined heat sink 21 Insertion hole 3 Control board 31 Light source control part 32 Communication control part 60 Power supply wire 61 Signal wire 64 Noise countermeasure ferrite core

Claims (4)

An antenna for receiving radio waves of a predetermined frequency, a light source substrate having a light source part having one or a plurality of light emitting diodes and a dimming circuit for adjusting the amount of light of the light emitting diodes mounted on one side, and received by the antenna A communication control unit that processes radio waves and outputs a control signal; and a light source control unit that controls the dimming circuit in accordance with a control signal from the communication control unit, and faces the other surface of the light source substrate Between the light source substrate and the control substrate so as to substantially cover the other surface of the light source substrate and to be thermally coupled to the light source substrate. Further, an electromagnetic shield combined heat dissipation plate having electrical conductivity and thermal conductivity, a power supply substrate having a power supply unit for supplying power to the light source unit, and a power supply wire connecting the power supply unit and the light source unit The light source control unit and the front Comprising a signal wire that connects the light source unit, the light source substrate, the electromagnetic shield combined heat radiating plate, said control board, and said power supply board, and a housing for accommodating therein stacked in the thickness direction,
An insertion hole through which at least the power supply wire is inserted among the power supply wire and the signal wire is penetrated by the heat radiation plate serving also as an electromagnetic shield, and at least the power supply among the power supply wire and the signal wire. The illuminating device, wherein the electric wire is inserted through an axial center of a cylindrical noise countermeasure ferrite core disposed between the electromagnetic shielding and heat radiating plate and the control board.   The lighting device according to claim 1, wherein the noise prevention ferrite core is in close contact with the electromagnetic shield heat sink.   Of the power supply wire and the signal wire, the wire inserted into the ferrite core is wound around the noise suppression ferrite core along the axial direction of the noise suppression ferrite core, and the noise The lighting device according to claim 1, wherein the lighting device is inserted through the axis of the countermeasure ferrite core a plurality of times.   The insertion hole is formed in an end portion of the electromagnetic shield and heat dissipation plate, the light source control unit is disposed in a region on one end side close to the insertion hole in the control board, and the communication control unit The lighting device according to any one of claims 1 to 3, wherein: is disposed in a region on the other end side away from the insertion hole in the control board.

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