JP2000138009A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of reducing the generation of radiant noise. SOLUTION: This luminaire 1 is composed of a luminaire body 2, a pair of lamp sockets 3, 4 mounted to the luminaire body 2, a straight tube type discharge lamp 6 mounted to the lamp sockets 3, 4, and a high-frequency lighting device 5 mounted to the luminaire body 2. The high-frequency lighting device 5 is provided with an electrically insulating board 7, an inverter circuit 9 that is mounted on the board 7, has a potential variation side output and a potential stabilization side output, and performs high-frequency conversion to energize the discharge lamp 6, a potential variation side terminal 11a that is electrically connected to the potential variation side output of the inverter circuit 9 and is installed on one end side of the board 7 so as to be adjacent to the one lamp socket 3 side, and a potential stabilization side terminal 11b that is electrically connected to the potential stabilization side output of the inverter circuit 9, and is installed at a board part 7b nearer to the other lamp socket 4 than the center 7a of the board 7 so as be positioned on the other lamp socket 4 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a lighting fixture.

[0002]

[Prior art]

[0003] Conventionally, as a luminaire against radiation noise or the like radiated from the wiring, for example, Japanese Utility Model Publication No. 4-8568.
Is disclosed in Japanese Patent Application Publication (prior art). As shown in FIG. 5, the lighting fixture 20 includes a first lamp socket 21, a second lamp socket 22, and an inverter-type lighting device 23. A straight tube fluorescent lamp (not shown) is mounted on the first lamp socket 21 and the second lamp socket 22 which are spaced apart from each other. The inverter-type lighting device 23 has a potential change-side terminal 24 disposed adjacent to the first lamp socket 21 and connected to the first lamp socket 21, and the second lamp socket 2.
2 has a potential stable side terminal 25 connected to it. Further, the capacitor C4 is arranged adjacent to the first lamp socket 21 side. P1 is a lead wire between the potential change side terminal 24 and the terminal 26 of the first lamp socket 21, P2 is a lead wire between one terminal of the capacitor C4 and the terminal 27 of the first lamp socket 21, and P3 is a lead wire of the capacitor C4. A lead wire between the other terminal and the terminal 28 of the second lamp socket 22,
P4 is the potential stable terminal 25 and the second lamp socket 22
Are the lead wires between the terminals 29.

[0004] When a commercial power supply is turned on, the lighting apparatus 20
The inverter-type lighting device 23 operates, and the potential fluctuation side terminal 2
4 and the fluorescent lamp connected to the potential stable side terminal 25 are turned on. At this time, since the lead wire P1 connecting the potential variation side terminal 24 and the first lamp socket 21 is extremely short, electromagnetic and electrostatic induction to non-charged metal parts such as the appliance body 30 and the reflector is prevented. Radiation noise can be reduced.

[0005]

[Problems to be solved by the invention]

However, lead P1 and lead P4
Are derived from the inverter type lighting device 23 in the same direction, and since the lead wire P4 and the lead wires P1 and P2 are disposed close to each other, electromagnetic waves radiated from the lead wires P1 and P2 are Acting on P4, as a result, radiation noise may be generated from the lighting fixture 20.

[0007] It is an object of the present invention to provide a luminaire in which radiation noise hardly occurs.

[0008]

According to a first aspect of the present invention, there is provided a lighting apparatus, comprising: a lighting apparatus main body; a pair of lamp sockets mounted on the lighting apparatus main body; An electrical insulating substrate, an inverter circuit mounted on the substrate, having an output on the potential fluctuation side and an output on the potential stability side, converting the high-frequency power to energize the discharge lamp, and the potential of the inverter circuit. Electrically connected to a fluctuation-side output, electrically connected to a potential fluctuation-side terminal disposed on one end side of the substrate so as to be close to one of the lamp socket sides, and a potential stabilization-side output of an inverter circuit; A potential stabilizing terminal disposed on a substrate portion of the other lamp socket side with respect to the center of the substrate so as to be located on the other lamp socket side, and attached to the lighting fixture body. It is provided with; and frequency lighting device.

In such a high-frequency lighting device, an electromagnetic wave is generated in a lead wire that electrically connects between the potential variation terminal of the inverter circuit and one of the lamp sockets.
This electromagnetic wave tends to act on the lead wire that electrically connects the other lamp socket side and the potential stabilizing terminal to generate radiation noise. In the present invention, the potential variation side terminal is disposed on one end side of the substrate so as to be close to one lamp socket side, and the potential stable side terminal of the inverter circuit is located on the other lamp socket side. Since it is arranged on the board part on the other lamp socket side from the center, the potential stable side terminal and the potential fluctuation side terminal are arranged on the board apart from each other, and the potential stable side terminal and the other lamp are arranged. The lead wires that electrically connect between the socket sides are less susceptible to the effects of electromagnetic waves generated on the lead wires that electrically connect between the potential fluctuation terminal and one of the lamp socket sides. is there.

[0010] According to a second aspect of the present invention, in the lighting apparatus according to the first aspect, the high-frequency lighting device comprises:
Housed in a metal case.

Since the high-frequency lighting device is housed in the metal case, the metal case shields electromagnetic waves generated from the high-frequency lighting device, thereby preventing radiation noise from lighting equipment.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show a lighting apparatus according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view, and FIG.

In FIG. 1, 1 is a lighting fixture, 2 is a lighting fixture main body, 3 and 4 are a pair of lamp sockets, 5 is a high-frequency lighting device, 6 is a discharge lamp, and 7 is a substrate.

The luminaire 1 has a pair of lamp sockets 3 and 4 mounted on the outer surface of a luminaire main body 2 and a high-frequency lighting device 5 housed therein. A straight tube fluorescent lamp 6 as a discharge lamp is provided between the lamp sockets 3 and 4.
Is attached.

First, the high-frequency lighting device 5 will be described with reference to an example circuit diagram shown in FIG.

In the high-frequency lighting device 5 shown in FIG. 2, a DC power supply 8 is formed by connecting an input terminal of a rectifier DB to a commercial AC power supply Vs and connecting a smoothing capacitor C1 to an output terminal. The DC power supply 8 is connected to the inverter circuit 9 and serves as an input power supply for the inverter circuit 9. Inverter circuit 9 includes field effect transistors FET1 and F as switching elements.
ET2 is configured as a half-bridge type. The gates of the field effect transistors FET1 and FET2 are connected to a drive circuit 10, and the drive circuit 10 is connected to a control circuit 11. The drive circuit 10 is a field effect transistor FET
1, the control circuit 11 controls the drive circuit 10 so that the field-effect transistors FET1 and FET2 operate at a predetermined frequency.

A connection point a between the field effect transistor FET1 and the field effect transistor FET2 is connected to an output terminal 11a via an inductor L1 as a current limiting element and a DC cut capacitor C2, and the source of the field effect transistor FET2 is connected to the output terminal. 11b.
The source side b of the field effect transistor FET2 is connected to the ground E. The output terminals 11a and 11b are
Filament 6a of fluorescent lamp 6 as a discharge lamp,
6b is connected to one end. The capacitor C3 forms a series resonance circuit with the inductor L1, and the fluorescent lamp 6
To obtain a preheating current at the time of starting and a secondary voltage for starting, both ends of which are connected to terminals 11c and 11d. The terminals 11c and 11d are connected to the other ends of the filaments 6a and 6b of the fluorescent lamp 6, respectively.

When the commercial AC power supply Vs is turned on and the inverter circuit 9 operates, high-frequency power is generated between the output terminals 11a and 11b to energize the fluorescent lamp 6. At this time, since the output terminal 11b is connected to the ground E,
The potential is stable, while the potential of the output terminal 11a constantly fluctuates. That is, the output terminal 11a forms a potential variation side terminal electrically connected to the potential variation side output of the inverter circuit 9, and the output terminal 11b is electrically connected to the potential stability side output of the inverter circuit 9. A potential stabilizing terminal is formed.

In FIG. 2, the inverter circuit 9 is of a separately-excited type, but may be of a self-excited type, or may be of any type as long as it has at least one switch element and has a potential variation side output and a potential stable side output. .

In FIG. 2, components other than the fluorescent lamp 6, such as the DC power supply 8, the inverter circuit 9, and the terminals 11a to 11d of the high-frequency lighting device 5, are mounted on an electrically insulating substrate 7. Then, the potential change side terminal 11a
Is disposed on one end side of the substrate 7, and the potential stabilizing terminal 11 b is disposed on a substrate portion 7 b (oblique side portion in FIG. 1 (b)) which faces the potential varying terminal 11 a more than the center 7 a of the substrate 7. ing. Further, the substrate 7 is provided with both end terminals 11c and 11d of the capacitor C3 which are arranged side by side at a distance from the potential fluctuation side terminal 11a and the potential stabilization side terminal 11b. Then, the high-frequency lighting device 5, as shown in FIG.
It is attached to the lighting fixture main body 2 so that the potential variation side terminal 11a is close to the one lamp socket 3 side and the potential stabilization side terminal 11b is located on the other lamp socket 4 side. The potential change side terminal 11a is connected to one terminal 3a of the lamp socket 3 and a lead C1 through a capacitor C.
The third terminal 11c is connected to the other terminal 3b of the lamp socket 3 via a lead L3. The potential stabilizing terminal 11b is connected to one terminal 4a of the lamp socket 4 via a lead L2, and the terminal 11d of the capacitor C3 is connected to the other terminal 4b of the lamp socket 4 via a lead L4. Terminals 3a, 3b of lamp socket 3
Are connected to both ends of the filament 6a of the fluorescent lamp 6 in the lamp socket 3, and the terminals 4a,
4 b are connected to both ends of the filament 6 b of the fluorescent lamp 6 in the lamp socket 4.

Since the terminal 11c of the capacitor C3 is located at the potential variation output of the inverter circuit 9, it is disposed at one end of the substrate 7 closer to the lamp socket 3 than the center 7a of the substrate 7. The terminal 11d of the capacitor C3 is
It is preferable to dispose the lead wire L4 on the board portion 7b closer to the lamp socket 4 than the center 7a of the board 7 so that the lead wire L4 is separated from the lead wires L1 and L3 as much as possible.

Next, the operation of the above embodiment will be described.

When the commercial AC power supply Vs is turned on, the high-frequency lighting device 5 operates to turn on the fluorescent lamp 6. At this time, an electromagnetic wave is generated from the potential change side terminals 11a and 11c and the lead wires L1 and L3. This electromagnetic wave acts on other members such as the lighting fixture body 2 and a reflection plate (not shown) to generate radiation noise. However, the potential change side terminal 11a
And the terminal 11c are arranged on one end side of the substrate 7 so as to be close to the one lamp socket 3 side, and the lead wires L1,
The length of L3 is extremely short.
b and the terminal 11d are arranged on the substrate portion 7b on the other lamp socket 4 side from the center 7a of the substrate 7 so as to be located on the other lamp socket 4 side. And lead wires L2, L4
Is greatly separated from the potential variation output, and is less susceptible to the action of electromagnetic waves generated from the potential variation output.

The potential change side terminals 11a and 11c are arranged on one end of the substrate 7 so as to be close to one of the lamp sockets 3 side.
d is the substrate 7 so as to be located on the other lamp socket 4 side.
Since the lamp unit 4 is disposed on the substrate portion 7b on the other side of the lamp socket 4 with respect to the center 7a, it is possible to provide the luminaire 1 in which radiation noise can be significantly reduced.

The potential change side terminal 11a and the terminal 1
1 c may be provided at a position on one end side closer to the lamp socket 3 side on one lamp socket 3 side than the center 7 a of the substrate 7. At this time, the lead wires L1,
It is preferable to dispose L3 as short as possible. The potential stabilizing terminal 11b and the terminal 11d are connected to the substrate 7
May be disposed on the substrate portion 7b on the other side of the lamp socket 4 with respect to the center 7a of the
a, terminal 11c and lead wires L1 and L3, it is preferable to dispose them as far as possible.

FIG. 3 is a perspective view of a lighting apparatus according to the present embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, a lighting fixture 12 is a lighting fixture that is directly attached to a ceiling, a wall, or the like. A pair of lamp sockets 3 and 4 are attached to both ends of a lower surface of the lighting fixture main body 2. A straight tube fluorescent lamp 6 is mounted therebetween. Further, a reflecting surface 13 is formed so as to optically face the fluorescent lamp 6, and on the inner surface side of the reflecting surface 13,
The high-frequency lighting device 5 shown in FIG. 2 is accommodated. The high-frequency lighting device 5 is attached to the lighting fixture main body 2 such that the terminals 11 a and 11 c on the potential fluctuation output side are close to one of the lamp sockets 3.

FIGS. 4A and 4B show a high-frequency lighting device used in the lighting apparatus of the present embodiment, wherein FIG. 4A is a top view and FIG. 4B is a side view. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

The high-frequency lighting device 14 shown in FIG. 4 is obtained by covering the high-frequency lighting device 5 shown in FIG. 2 in aluminum cases 15 and 16 as metal cases. Then, lead wires L1 and L3 are led out from one end of the cases 15 and 16, and lead wires L2 and L4 and power lines L5 and L6 connected to the commercial AC power supply Vs are led out from the other end. The high-frequency lighting device 14 is attached to the lighting fixture main body 2 of the lighting fixture 12 shown in FIG. 3 via the attachment holes 17a and 17b, for example. Although the ventilation holes 18 are provided on the aluminum cases 15 and 16, it is not always necessary to provide them.

Since the high-frequency lighting device 14 is housed in the aluminum cases 15 and 16 as metal cases, the electromagnetic waves generated from the high-frequency lighting device 14 are transmitted through the aluminum case 1.
5, 16 can be shielded, and radiation noise from the lighting equipment 12 can be prevented.

[0032]

According to the first aspect of the present invention, the potential variation terminal of the high frequency lighting device is disposed on one end of the substrate so as to be close to one of the lamp sockets, and the potential stabilization terminal is connected to the other. Is disposed on the board portion on the other lamp socket side with respect to the center of the board so as to be located on the lamp socket side of the above, so that radiation noise can be particularly reduced.

According to the second aspect of the present invention, the high-frequency lighting device is housed in the metal case, and the metal case shields electromagnetic waves generated from the high-frequency lighting device, so that radiation noise from the lighting equipment can be prevented. .

[Brief description of the drawings]

1A and 1B show a lighting device according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view, and FIG.

FIG. 2 is a circuit diagram of a high-frequency lighting device.

FIG. 3 is a perspective view of a lighting device.

4A and 4B show a high-frequency lighting device used for a lighting fixture, wherein FIG. 4A is a top view and FIG. 4B is a side view.

FIG. 5 is a plan view showing a conventional lighting fixture.

[Explanation of symbols]

 Reference Signs List 1,12 lighting equipment 2 lighting equipment main body 3,4 lamp socket 5,14 high frequency lighting device 6 fluorescent lamp as discharge lamp 7 substrate 9 inverter circuit 11a potential fluctuation side terminal 11b ... potential stable side terminals 15, 16 ... aluminum case as metal case

Claims (2)

[Claims] 1. A lighting fixture main body; a pair of lamp sockets attached to the lighting fixture main body; a straight tube type discharge lamp mounted on the lamp socket; an electrically insulating substrate; An inverter circuit that has a potential variation side output and a potential stability side output, and that is high-frequency power-converted and energizes the discharge lamp, and is electrically connected to the potential variation side output of the inverter circuit, and is connected to one of the lamp sockets. A potential variation terminal arranged on one end side of the substrate so as to be close to, and electrically connected to a potential stable side output of the inverter circuit, so that it is located on the other lamp socket side than the center of the substrate. And a high-frequency lighting device attached to the lighting fixture main body, comprising: a potential stabilizing terminal disposed on the substrate portion on the other lamp socket side. Lighting appliances. 2. The lighting apparatus according to claim 1, wherein the high-frequency lighting device is housed in a metal case.