JP4654931B2 - Fluorescent lamp luminaire and method for reducing radiation noise - Google Patents

Description

  The present invention relates to a fluorescent lamp luminaire for lighting a straight tube type fluorescent lamp by a fluorescent lamp electronic ballast and a method for reducing the radiation noise thereof.

  In recent years, instead of copper-iron ballasts, there has been a fluorescent lamp illuminator equipped with a fluorescent lamp electronic ballast that converts a commercial frequency (50 Hz or 60 Hz) to a high frequency (for example, 50 kHz) by an inverter circuit and turns on the fluorescent lamp. It is popular. In such a fluorescent lamp luminaire, it is necessary to take measures so that noise (high-frequency noise) generated from the fluorescent lamp electronic ballast does not adversely affect other devices.

For example, there has been proposed a fluorescent lamp luminaire that takes measures against radiation noise radiated from wiring connecting a fluorescent lamp electronic ballast (hereinafter referred to as a ballast) and a lamp socket (see Patent Document 1). This conventional example includes a ballast in which a printed wiring board on which an inverter circuit is mounted is housed in a metal case, and the potential fluctuation side output terminal of the inverter circuit is disposed close to one lamp socket and the potential stabilization side By arranging the output terminal closer to the other lamp socket, the wiring length between the potential fluctuation side output terminal and the lamp socket is shortened and the distance from the wiring between the potential stabilization side output terminal and the lamp socket is increased. Radiation noise is reduced by suppressing the influence of electromagnetic waves radiated from the wiring between the potential fluctuation side output terminal and the lamp socket on the wiring between the potential stabilization side output terminal and the lamp socket. In addition to this, a metal louver provided on the opening surface side of the instrument body to reduce radiation noise has been proposed.
JP 2000-138209 A

  However, in the conventional example described in Patent Document 1, it is necessary to place the ballast on one side with respect to the instrument main body, and the weight balance of the instrument main body is extremely biased to one end side. It was difficult to do. Further, when a metal member such as a louver is arranged in front of the fluorescent lamp, the light from the fluorescent lamp is blocked by the metal member.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce the radiation noise without restricting the arrangement of the fluorescent light electronic ballast with respect to the fixture body and without unnecessarily blocking the light of the fluorescent light. It is an object of the present invention to provide a fluorescent lamp illuminating device that can be used and a method for reducing the radiation noise.

In order to achieve the above object, the invention of claim 1 is characterized in that at least a pair of lamp sockets in which straight tube fluorescent lamps are detachably mounted, and lamp sockets each made of a metal material at both longitudinal ends. Is mounted on the fixture body so as to cover the fluorescent lamp electronic ballast, and the fluorescent lamp electronic ballast that is attached to the fixture body and lights the fluorescent lamp through the lamp socket. A power supply line drawn into a space formed between the instrument body and the reflector plate through a power line insertion hole provided in the bottom surface of the instrument body and connected to the fluorescent lamp electronic ballast. A fluorescent lamp luminaire comprising support means for supporting a part of the power supply line arranged along the reflector in parallel with the fluorescent lamp, and the power supply line is positioned at the shortest distance from the fluorescent lamp. In Characterized in that it is supported on said support means in close contact with the morphism plate.

In order to achieve the above object, the invention of claim 2 is characterized in that at least a pair of lamp sockets in which straight tube fluorescent lamps are detachably mounted, and lamp sockets each made of a metal material at both longitudinal ends. Is mounted on the fixture body so as to cover the fluorescent lamp electronic ballast, and the fluorescent lamp electronic ballast that is attached to the fixture body and lights the fluorescent lamp through the lamp socket. A power supply line drawn into a space formed between the instrument body and the reflector plate through a power line insertion hole provided in the bottom surface of the instrument body and connected to the fluorescent lamp electronic ballast. a method of reducing radiation noise of a fluorescent lamp lighting apparatus, the reflecting part of the power line, as well as arranged along the reflector in parallel with the fluorescent lamp, the position of the shortest distance from the fluorescent lamp Characterized in that is brought into close contact.

According to the present invention, a part of the power line is arranged along the reflector in parallel with the fluorescent lamp, and is closely attached to the reflector at a position at the shortest distance from the fluorescent lamp. Radiation noise can be reduced by offsetting the leaked radio wave caused by the high-frequency current flowing through and the leaked radio wave caused by the high-frequency current flowing through the reflector, and, as in the conventional example, a fluorescent lamp for the instrument body It is possible to provide a fluorescent lamp luminaire that does not restrict the arrangement of the electronic ballast and that does not unnecessarily block the light of the fluorescent lamp, and a method for reducing the radiation noise thereof.

  Hereinafter, an embodiment in which the present invention is applied to a ceiling-mounted facility lighting apparatus will be described in detail with reference to FIGS.

  In this embodiment, an instrument main body 1 (see FIG. 2) that is formed in a substantially U-shaped cross-section with an open bottom surface and attached to a ceiling, and a pair of sockets provided at both ends of the instrument main body 1 in the longitudinal direction. (Lamp socket) 2, a reflecting plate 3 having a substantially V-shaped cross-section that is attached to the instrument body 1 so as to cover the opened lower surface side, and the instrument body 1 are held between the sockets 2 so that their longitudinal directions coincide with each other. And two straight tube lamps (fluorescent lamps) 4. Note that the present embodiment is a so-called Fuji-type fluorescent lamp lighting fixture.

  The instrument body 1 is formed by bending a metal plate, and a pair of insertion holes 1b through which mounting bolts 82 provided on the ceiling are inserted are drilled as shown in FIG. That is, when attaching the instrument main body 1 to the ceiling, the nut 84 may be tightened with the washer 83 interposed between the attachment bolts 82 inserted into the insertion holes 1b. In addition, the instrument body 1 is provided with a terminal block 7 at a substantially central portion in the longitudinal direction, and a ballast (fluorescent lamp electronic ballast) 5 is disposed at a position near one socket 2 from the terminal block 7, Furthermore, a power hole 1a for drawing a power line (three-core VVF cable) 81 connected to an AC power source composed of a commercial power source and pre-wired on the back of the ceiling is located near the other socket 2 from the terminal block 7. Perforated. Here, a power supply line 81 drawn through a wire hole 1 a into a space (hereinafter referred to as “internal space”) formed between the instrument body 1 and the reflector 3 is connected to the terminal block 7. The ballast 5 has a printed wiring board (not shown) on which an inverter circuit or the like that converts from a commercial frequency to a high frequency by switching one or more switching elements is housed in a metal case 5a. Although it is configured, details and details are well known in the art, and illustration and description thereof are omitted.

  In addition, the fixture body 1 is provided with a fixture 18 for attaching the reflector 3, while the reflector 3 is provided with a latch 32 that is attached to each fixture 18.

  The reflection plate 3 is formed by bending a metal plate, and a pair of socket insertion holes 31 through which the socket 2 is inserted are provided at both ends in the longitudinal direction. The two lamps 4 are arranged so as to be parallel to each other so as to sandwich the top of the reflector 3 having a substantially V-shaped cross section.

  Here, in the present embodiment, the power supply line 81 drawn into the internal space from the power supply hole 1 a is arranged along the reflector 3 in parallel with the fluorescent lamp 2. That is, as shown in FIG. 1 (b), the power supply line 81 suspended straight from the power supply hole 1a is supported by a plurality of (four in the illustrated example) support members 6 attached to the inner wall surface of the reflecting plate 3. In this state, it is connected to the terminal block 7 and is arranged along the inner side of the top (lower end) of the reflector 3 in parallel with the fluorescent lamp 2 by being supported by these four support members 6. Yes.

  As shown in FIG. 1 (a), the support member 6 has a fixed piece 60 attached to the inner wall surface of the reflector 3 and a substantially bowl-shaped one end supported by the fixed piece 60 and the other end thereof being freely deflectable. The support piece 61 thus formed is integrally formed of an elastic synthetic resin. That is, the power supply line 81 is held between the reflecting plate 3 and the support piece 61 so as to be pressed from above by the support piece 61 (see FIG. 1). The ground wire of the power supply line 81 and the instrument main body 1 are electrically connected via the terminal block 7, and the circuit ground of the ballast 5 is electrically connected to the instrument main body 1 via the case 5a. . Here, the socket 2 connected to the output terminal connected to the circuit ground side of the ballast 5 is referred to as a low voltage side socket 2 and connected to the output terminal not connected to the circuit ground of the ballast 5. The socket 2 is called the high-pressure side socket 2.

  Thus, a part of the high-frequency current supplied from the ballast 5 flows through the tube wall of the lamp 4 so that an induced electromotive force is generated in the metal reflector 3, and the appliance main bodies are electrically connected to each other. 1 and the reflecting plate 4 are formed in a closed loop along the longitudinal direction, and a high-frequency current output from the ballast 5 flows through the closed loop, whereby leaked radio waves (radiation noise) are radiated. On the other hand, in the present embodiment, since a part of the power line 81 is arranged along the reflector 3 in parallel with the lamp 4, the leaked radio wave caused by the high-frequency current flowing through the power line 81 is reduced. By canceling out the leaked radio wave caused by the high-frequency current flowing through the reflecting plate 3, radiation noise can be reduced, and the arrangement of the ballast 5 with respect to the instrument body 1 is restricted as in the conventional example. There is no need to block the light of the lamp 4 unnecessarily.

  Here, the leakage radio wave (radiation noise) of the present embodiment was measured by the measurement method of the leakage radio wave test prescribed by VCCI (Radio interference voluntary regulation council for information processing devices, etc.). As shown in FIG. In the present embodiment, the total length of the reflector 3 is 1250 mm, and the tube length of the lamp 4 is 1200 mm. FIG. 4 shows the maximum value of the leaked radio wave (vertically polarized wave and horizontally polarized wave) level measured by changing the length L of the power line 81 extending along the reflector 3 in 5 cm increments in the range of 0 cm to 40 cm. Show. As is clear from FIG. 4, the length L is 0 cm, that is, in the conventional example (the power supply line 81 is along the instrument body 1), there is a maximum value (vertical polarization) of 46.8 dB at 89 MHz. However, the maximum value level decreased as the length L increased, and when the length L = 35 cm, the maximum value (vertical polarization) could be reduced to 37.2 dB (100 MHz). On the other hand, FIG. 5A shows the measurement result of leaked radio waves (vertically polarized waves and horizontally polarized waves) in the frequency range of 30 MHz to 300 MHz when the length L is 35 cm, and FIG. 5B shows the conventional example (length). The measurement results of leaked radio waves (vertically polarized waves and horizontally polarized waves) at L = 0 cm) are shown. However, in FIG. 5, the vertical polarization of the leaked radio wave is indicated by a solid line A, and the horizontal polarization is indicated by a solid line B. For reference, the reference value of VCCI Class B is indicated by a straight line C. In addition, about the fluorescent lamp lighting fixture which concerns on this invention, although it is not contained in the control object of 30 MHz or more in VCCI, it cannot be overemphasized that it is desirable that there are few leaked electromagnetic waves.

  Note that, as the distance between the lamp 4 and the power supply line 81 is closer, it is predicted that the effect of reducing the radiation noise is higher. Therefore, in this embodiment, the positions of the two lamps 4 and 4 that are the same distance and the shortest distance, that is, the reflection A power line 81 is disposed on the top of the plate 3, and the power line 81 is in close contact with the reflector 3. In the present embodiment, the power supply line 81 is fixed to the reflector 3 using the support member 6, but the present invention is not limited to this, and other support means such as an adhesive tape may be used.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiment of this invention is shown, (a) is a side view, (b) is sectional drawing abbreviate | omitted partially. It is an exploded perspective view same as the above. It is a perspective view same as the above. The measurement results of leaked radio waves are shown. The measurement result of a leaked electric wave is shown, (a) is this embodiment, (b) is a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument body 2 Socket 3 Reflector 4 Lamp 5 Ballast 6 Support member 81 Power supply line

Claims (2)

At least a pair of lamp sockets in which straight tube fluorescent lamps are detachably mounted, an appliance body made of a metal material and provided with lamp sockets at both ends in the longitudinal direction, and a lamp attached to the appliance body A fluorescent lamp electronic ballast that lights the fluorescent lamp through a socket and a reflector that is attached to the fixture body and reflects the light of the fluorescent lamp so as to cover the fluorescent lamp electronic ballast are provided on the bottom surface of the fixture body. A fluorescent lamp illuminator in which the power line drawn into the space formed between the instrument body and the reflector through the power line insertion hole connected to the fluorescent ballast is reflected in parallel with the fluorescent lamp a support means for supporting a portion of the power line that is arranged along the plate, the power line is supported by said support means in close contact with the reflecting plate at the position of the shortest distance from the fluorescent lamp Fluorescent lighting fixture, characterized in that. At least a pair of lamp sockets in which straight tube fluorescent lamps are detachably mounted, an appliance body made of a metal material and provided with lamp sockets at both ends in the longitudinal direction, and a lamp attached to the appliance body A fluorescent lamp electronic ballast that lights the fluorescent lamp through a socket and a reflector that is attached to the fixture body and reflects the light of the fluorescent lamp so as to cover the fluorescent lamp electronic ballast are provided on the bottom surface of the fixture body. A method of reducing the radiation noise of a fluorescent lamp illuminator in which a power line drawn into a space formed between the instrument body and a reflector through a power line insertion hole is connected to a fluorescent lamp electronic ballast, a portion of the power line, as well as arranged along the reflector in parallel with the fluorescent lamp, fluorescent lamp lighting apparatus, characterized in that for adhering the reflective plate at the position of the shortest distance from the fluorescent lamp Radiation noise reduction method.

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