JP4085654B2 - Inverter lighting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inverter lighting fixture that is lit at a high frequency by an inverter circuit, and more particularly to an inverter lighting fixture that reduces electric field noise.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, lighting fixtures used in offices and the like include lighting lamps such as fluorescent lamps that are lit at a high frequency by an inverter circuit. When a wireless communication device using radio waves such as a wireless loudspeaker is used in a room in which the inverter lighting apparatus is installed, noise interference may occur in the wireless communication device due to electric field noise generated from the illumination lamp. Japanese Unexamined Patent Publication No. 9-161535 discloses an inverter lighting fixture that takes measures against the electric field noise.
[0003]
This is made of a conductive metal material and opened on one side, an illumination lamp provided inside the box, a reflector provided between the illumination lamp and the bottom of the box, and a box And a louver frame having a conductive louver disposed in the opening. This louver is formed in a honeycomb shape and is attached so as to cover the entire opening of the box, so that the irradiation light emitted from the illumination lamp is not reflected or absorbed by the louver, Since only the light that has passed between the two becomes the illumination light that is actually emitted from the inverter illumination fixture, the illumination light amount of the inverter illumination fixture is lower than the illumination light amount of the illumination lamp. In addition, in order to reduce electric field noise, it is necessary to ensure electrical connection between the honeycomb-shaped louver and the louver frame. However, since there are a plurality of contact points, there is a problem that labor and cost are increased. .
[0004]
Furthermore, inverter lighting fixtures with reduced electric field noise are desired in places where careful attention to electric field noise is required, such as hospitals and clean rooms, but when louvers are installed to reduce electric field noise, Since the amount of illumination light is reduced, it is necessary to increase the number of inverter lighting fixtures installed, which increases costs. However, if the number of installations increases, the electric field noise increases accordingly, and a fundamental solution has not been achieved.
[0005]
[Problems to be solved by the invention]
Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide an inverter lighting apparatus capable of reducing electric field noise without reducing illuminance.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an inverter lighting apparatus of the present invention has the following configuration. That is, according to the first aspect of the present invention, in an inverter illuminator that irradiates light to an object to be irradiated with a plurality of illumination lamps having at least a portion of the straight tube portion at a high frequency, a plurality of illuminations are provided along the straight tube portion. A metal wire made of a grounded conductive material is provided between the lamps and protrudes toward the irradiated object.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
Explaining the first reference example (first reference example) lighting implement according to the present invention, in the following with reference to FIGS. In this reference example , the inverter luminaire includes two illumination lamps 21 and 21 that are formed in a hollow cylindrical shape as a whole, and a casing 11 as a luminaire main body made of a conductive material to which the illumination lamp 21 is attached. A flat reflector 41 made of a metal material provided to be supported on one surface 41a of the housing 11 and reflecting the light emitted from the illumination lamp 21 toward the housing 11 toward the irradiated object; A metal plate 31 as a radiation noise reducing member made of a conductive material such as steel disposed between the lamps 21 and 21 along the entire length thereof; a support portion 13 that supports the metal plate 31 on the reflection plate 41; A lead wire 51 that electrically connects the metal plate 31 and the housing 11; and an inverter circuit portion (not shown) that is provided inside the housing 11 and controls the illumination lamp 21 to be turned on at a high frequency. Case 11 is grounded It has become a reference potential Te.
[0012]
The housing 11 includes two pairs of lamp sockets 12 and 12 on one surface, and a connection terminal portion (not shown) provided at the end of the lamp socket 12 in the axial direction of the illumination lamp 21. Is electrically connected to the inverter circuit section.
[0013]
The metal plate 31 is formed in a flat plate shape having the same length as the entire length of the illumination lamp 21, and one end in the longitudinal direction thereof is electrically connected to the housing 11 via the lead wire 51 and grounded. ing. As shown in FIG. 2, the metal plate 31 has one end face 31 a spaced from the one surface 41 a of the reflector 41 by a separation distance L <b> 11, and the other end face 31 b is on the irradiated object side, that is, the reflector 41. Is supported by the support portion 13 so as to protrude from the illumination lamp 21 in a direction away from the illumination lamp 21. At this time, the separation distance L 11 is 2.5 cm, the width L 12 is 5 cm, and the length is corresponding to the length of the illumination lamp 21. It is 114 cm. FIG. 2 shows a cross section taken along the line AA ′ of FIG.
[0014]
The inverter circuit unit is a fluorescent lamp lighting circuit that converts a commercial power source of 100 V or 200 V into a high-frequency alternating current of about 50 to 60 kHz and outputs it. The illumination lamp 21 that is lit at a high frequency by the inverter circuit unit generates an electric field around it.
[0015]
Below, operation | movement of the inverter lighting fixture in this reference example is demonstrated. When power is supplied to the inverter circuit unit of the inverter lighting device, the inverter circuit unit converts the power supplied to the 50 kHz high-frequency alternating current and outputs it to the lamp socket 12.
[0016]
The illumination lamp 21 connected to the lamp socket 12 is turned on at a high frequency by an applied high-frequency alternating current (hereinafter, applied current). When the illumination lamp 21 is turned on at a high frequency, an electric field corresponding to the magnitude of the applied current is generated around the illumination lamp 21. That is, the two illumination lamps 21 and 21 generate electric fields in the same direction at parallel positions.
[0017]
At this time, a current opposite to the applied current is induced in the metal plate 31 disposed between the illumination lamps 21 and 21 and the reflection plate 41 below the illumination lamp 21 (hereinafter, referred to as the applied current). Induced current).
[0018]
Since the directions of the applied current and the induced current are opposite, the electric field generated by the applied current and the electric field generated by the induced current are reversed, and the centers of these two electric fields are located in the vicinity. Electric field noise generated from the inverter lighting apparatus is reduced.
[0019]
At this time, the electric field intensity of the electric field noise generated from the inverter lighting fixture has a magnitude corresponding to the current value of the difference between the applied current and the induced current. That is, the electric field noise is reduced as the current value of the induced current is closer to the applied current. The electric field noise is further reduced as the center of the electric field generated by the applied current is closer to the center of the electric field generated by the induced current. Therefore, in order to further reduce the electric field noise, it is effective to change the material or shape of the metal plate 31 or to change the arrangement position of the metal plate 31 with respect to the illumination lamp 21.
[0020]
For example, by changing the material of the metal plate 31 from steel to aluminum or copper, the electric field noise can be further reduced. As shown in FIG. 3, the material of the metal plate 31 is changed from steel (◯ mark in FIG. 3) to aluminum (□ mark in FIG. 3) and aluminum to copper (Δ mark in FIG. 3). The electric field noise generated from the lighting fixture is surely reduced, and the electric field noise is reduced by about 10 to 20 dB in copper compared to steel.
[0021]
Further, as reference examples in which the arrangement position of the metal plate 31 with respect to the illumination lamp 21 is changed, there are those shown in FIGS. 4 and 5. In the example shown in FIG. 4, the metal plate 33 has a width L22 = 10 cm. The side end face 33a and the one surface 41a of the reflection plate 41 are supported by the support portion 13 so as to be separated by a separation distance L21 = 1 mm.
[0022]
5, the metal plate 34 has a width L32 of 15 cm, the one end surface 34a and the one surface 41a of the reflecting plate 41 are separated from each other by a separation distance L31 = 1 mm. It is supported by.
[0023]
FIG. 6 shows electric field intensities simulating electric field noise radiated from the inverter lighting fixture having the metal plate shown in FIGS. 2, 4 and 5, respectively. When there is no symbol, □ indicates the case of the metal plate 31 of FIG. 2, ○ indicates the case of the metal plate 33 of FIG. 4, and + indicates the case of the metal plate 34 of FIG. As shown in FIG. 6, the larger the area of the metal plate 31 arranged in the vicinity of the illumination lamp 21, the larger the current flowing through the metal plate 31, thereby further reducing the electric field noise generated from the inverter lighting fixture. be able to. Moreover, by providing the metal plate 31, electric field noise is reduced by about 3 to 5 dB compared to the case where the metal plate 31 is not provided. In this reference example , the metal plate 31 is provided apart from the reflecting plate 41. However, the metal plate 31 may be provided directly connected without being separated. FIG. 7 shows a structure in which the metal plate is directly connected to the reflecting plate without being separated and the shapes of the reflecting plate and the housing are changed.
[0024]
In the reference example shown in FIG. 7, the housing 15 has a triangular prism shape, the reflecting plate 42 has a rectangular shape covering two surfaces of the housing 15, and the metal plate 31 is illuminated on the apex portion of the reflecting plate 42 on the irradiated object side. It protrudes from the lamp and is directly connected to the reflector 42. In this reference example, the reflection plate 42 is grounded to have a reference potential, and the metal plate 31 is supported and electrically connected. As described above, the metal plate 31 is provided at the apex portion of the reflection plate 42 without being separated, and the illumination lamps 21 are arranged on two different surfaces of the reflection plate 42, so that the two illumination lamps 21 and 21 are reflected. Since the distance between the two illumination lamps 21 and 21 along the reflection plate 42 is not located on the same plane with respect to the plate 42, the electric field noise generated is reduced while reducing the size of the inverter lighting fixture. It becomes possible to make it.
[0025]
In this reference example , the application direction of the current applied to the two illumination lamps 21 and 21 is the same direction, but this is done so that a reverse current is applied between the illumination lamps 21 and 21. Also good. Moreover, although the metal plate 31 is formed to have the same length as the entire length of the illumination lamp 21 and is disposed along the entire length of the illumination lamp 21, the length of the metal plate 31 may be shorter than the illumination lamp 21. The arrangement position may be in the vicinity along the straight tube portion of the illumination lamp 21. By doing in this way, although the cost required in order to form a radiation noise suppression member can be reduced, the reduction effect of the electric field noise radiated | emitted from an inverter lighting fixture may fall.
[0026]
As described above, in the inverter lighting apparatus according to the present reference example , the electric field generated around the illumination lamp 21 by the applied current and the electric field generated by the induced current in the reflecting plate 41 and the metal plate 31 are opposite electric fields. Therefore, these electric fields cancel each other, and the electric field noise generated around the inverter lighting apparatus is reduced.
[0027]
A second reference example (second reference example) lighting implement according to the present invention will be described below with reference to FIG. In this reference example , the inverter lighting fixture includes two illumination lamps 21 and 21, a case 11 made of a conductive material and grounded, and a radiation noise suppression member made of copper that is electrically connected to the case 11. The half cylinder-shaped cylindrical body 35 is provided. In addition, the same code | symbol is attached | subjected to the same thing as the 1st reference example .
[0028]
The cylinder 35 is formed by connecting two cylinders 36 and 37 having a half cylinder shape and a hollow inner diameter 2 × R1, and is electrically connected to and supported by the housing 17. A part of the peripheral wall of the cylinder 36 is opened over the whole in the axial direction. Of the sections formed when the cylinder 36 is opened, a section different from the section 36 b and a cylinder formed in the same manner as the cylinder 36. A section 35c is formed by processing the section 37b of 37 and the other section. The cylindrical body 35 formed in this way has the two illumination lamps 21 and 21 so that the tube center axes of the two illumination lamps 21 and 21 and the center axes of the cylinders 36 and 37 accommodated respectively coincide with each other. Is housed.
[0029]
By forming the radiation noise suppressing member in this way, the separation distance between the outer peripheral surface of the tube of the illumination lamp 21 and the inner peripheral surface of the cylindrical body 35 becomes uniform at R1, and is generated by the applied current applied to the illumination lamp 21. The electric field generated and the electric field generated by the induced current induced in the cylindrical body 35 are symmetric with respect to the central axis of the illumination lamp 21, and the electric field noise generated from the inverter lighting fixture can be further reduced. Become.
[0030]
Further, the cylindrical body 35 has a large area surrounding the illumination lamp 21, that is, the sections 36b and 37b and the section 35c of the peripheral walls of the cylinders 36 and 37 are directed to the irradiated object side (in the direction away from the housing 11). Since the area where the inner peripheral surface of the cylinder 35 is opposed to the illumination lamp 21 is increased as the position is increased, the current induced in the cylinder 35 is also increased, and the effect of reducing electric field noise is further increased. Also in this case, the two illumination lamps 21 and 21 are provided so that their tube central axes coincide with the central axes of the cylinders 36 and 37 to be accommodated, respectively. In this reference example , the cylindrical body 35 is also used as a reflecting plate.
[0031]
A first embodiment of the (first embodiment) inverters luminaire according to the present invention will be described below with reference to FIG. In the present embodiment, two illumination lamps 21, a casing 11 made of a conductive material and grounded to a reference potential, a reflecting plate 41 made of a conductive material, and a metal wire as a reflection noise suppression member made of aluminum. 39 and a lead wire 51 that electrically connects the metal wire 39 and the housing 11. In addition, the same code | symbol is attached | subjected to the same thing as the 1st or 2nd reference example .
[0032]
The metal wire 39 protrudes from the illumination lamp 21 between the two illumination lamps 21 and 21 in parallel along the straight tube portion, in the direction away from the irradiated object, that is, in the direction away from the housing 11, and the support portion 13. It is supported by.
[0033]
The operation of the inverter lighting apparatus according to the present embodiment will be described. An electric field is generated around the illumination lamp 21 by the applied current applied to the illumination lamp 21. At this time, an induced current in the direction opposite to the applied current is generated in the metal wire 39 and the reflecting plate 41, and an electric field is generated around the metal wire 39 and the reflecting plate 41 due to the induced current.
[0034]
Since the electric field generated around the illumination lamp 21 and the electric field generated around the metal wire 39 and the reflector 41 are opposite electric fields, they cancel each other. As a result, electric field noise radiated from the inverter lighting fixture is reduced. As the metal line 39 is arranged closer to the illumination lamp 21, the center of the electric field generated around the metal line 39 and the center of the electric field generated around the illumination lamp 21 are closer. The canceling effect between the two electric fields increases, and the electric field noise radiated from the inverter lighting apparatus can be further reduced.
[0035]
Thus, the electric field generated in the illumination lamp 21 can be offset by the electric field generated in the metal wire 39, so that the electric field noise radiated from the inverter lighting fixture can be reduced and the radiation noise suppressing member can be reduced. Since the metal wire 39 is used, the cost can be further reduced.
[0036]
【The invention's effect】
As described above, the inverter illuminator according to claim 1 of the present invention is an inverter illuminator that radiates light to an object to be irradiated in a high-frequency manner by illuminating a plurality of illumination lamps having at least a portion of a straight tube portion with high conductivity. It is made of a conductive material and grounded, and is disposed between the plurality of illumination lamps along the straight pipe portion, and includes a metal wire protruding toward the irradiated object, so that according to the current flowing through the illumination lamp, a current is induced in the metal wire, it is possible to reduce the electric field noise generated from the inverter luminaire, since no cover the illumination surface of the illumination lamp, an effect that is less likely to reduce its intensity.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first reference example related to an inverter lighting fixture of the present invention. FIG. 2 is a diagram showing a cross section of the inverter lighting fixture. FIG. 3 is an electric field noise radiated from the inverter lighting fixture. Fig. 4 is a diagram showing a different reference example in the inverter lighting fixture. Fig. 5 is a diagram showing another reference example in the inverter lighting fixture. Fig. 6 is a diagram showing the inverter lighting fixture. FIG. 7 is a diagram showing still another reference example in the inverter lighting fixture. FIG. 8 is a diagram showing a second reference example related to the inverter lighting fixture of the present invention. FIG. 9 is a diagram showing a first embodiment of the inverter lighting apparatus of the present invention.
DESCRIPTION OF SYMBOLS 11 Case 15 Case 21 Illumination lamp 31 Metal plate 33 Metal plate 34 Metal plate 35 Cylindrical body 35b Section 39 Metal wire 41 Reflector

Claims (1)

In an inverter illuminator that radiates light to an object to be irradiated with a plurality of illumination lamps having a straight tube part at least at a high frequency,
An inverter illuminator comprising a metal wire made of a grounded conductive material that is disposed between a plurality of illumination lamps along the straight pipe portion and protrudes toward the irradiated object.

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