JPS6244364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting fixture having a mounting plate on which lighting circuit components are arranged.

Generally, discharge lamps such as fluorescent lamps are widely used as the light source of lighting equipment, but recently, as shown in Figure 1, several dozen lighting circuits have been developed.
High-performance, high-efficiency electronic devices using high-frequency inverters that oscillate at KHz were provided.

The lighting circuit shown in FIG. 1 will be explained. In the figure, 11
is a rectifier, the input side of which is connected to a commercial alternating current via a power line 12, and the output side of DC lines P and N connected to a high frequency lighting circuit, that is, a high frequency inverter 13. The high frequency inverter 13 has a pair of transistors 14 and 15 connected in a push-pull manner. That is, these transistors 1
After the emitters 4 and 15 are connected in common, they are connected to the electric line N via the constant current device 16, and the base is connected to the electric line P via the starting resistor 17, and the collector is connected to the primary winding of the inverter transformer 20. Connect to both ends of 21. Note that a resonance capacitor 22 is connected between both ends of the primary winding 21, and an electric line P is connected to the midpoint thereof. In addition to the primary winding 21, the inverter transformer 20 has a feedback winding 23 and a secondary winding 24. Here, the feedback winding 23 is connected to the bases of the transistors 14 and 15 to form a positive feedback circuit, and the transistor 1
4 and 15 are turned on and off alternately. The secondary winding 24 includes a plurality of discharge lamps 26 consisting of fluorescent lamps.
It is connected to a multiple lamp lighting circuit 29 via a dimming inductor 27 and a balancer 28.

The multi-lamp lighting circuit has two circuits in which two discharge lamps 26 are connected in series and connected in parallel via the balancer 28, and a total of four discharge lamps 26 are lit at the same time. Here, each discharge lamp 26 is connected in parallel with a filament transformer 30, and is connected to a filament constituting each electrode via a filament winding 30F to heat the filament. A dimmer switch 32 for shortening the dimmer inductor 27 is connected in parallel with the dimmer inductor 27.

The above-mentioned lighting circuit operates by turning on a power switch (not shown) and applying commercial AC power, which is converted into DC power by the Ichimoku rectifier 11, and then reversely converted to high-frequency power by the inverter 13, which is then transferred to the inverter transformer. The power is supplied to each discharge lamp 26 through 20 secondary windings 24, and the discharge lamps 26 are lit.

FIG. 2 shows a case in which such a lighting circuit is used in an actual lighting fixture, such as a chandelier.

In FIG. 2, reference numeral 44 denotes a device case which houses the circuit components shown in FIG. Inside this lamp 46,
A discharge lamp 26 is provided and connected to the high frequency inverter 13 inside the instrument case 44 via a leader line passing through the inside of the arm 45.

High-frequency lighting equipment like this has many circuit components, and in particular, in multi-lamp type lighting equipment, compared to single-lamp type, the circuit shown in Figure 1 has a large current and power, and in particular, the large amount of transformer etc. Formation cannot be avoided. In order to compactly store these large-sized circuit components inside the main body case 44, for example, the circuit components are divided into two groups, and two mounting plates 41, 42 are installed as shown in FIG. It has been proposed that these mounting plates 41 and 42 be assembled in two stages, upper and lower, within the main body case 44. However, in such a configuration, the lower mounting plate 4 is located between the upper mounting plate 41 and the lower mounting plate 42.
Since the circuit components on 2 are located, these mounting plates 4
The interval between 1 and 42 becomes large. For this reason, a long connection line is required to connect both the mounting plates 41 and 42. Further, the heat generated by the components on the lower mounting plate 42 is blocked by the upper mounting plate 41 and is not sufficiently dissipated, but remains between the upper and lower mounting plates 41 and 42. For this reason, not only the circuit components on the lower mounting plate 42 but also the upper mounting plate 41 are heated, resulting in a large overall temperature rise. In order to prevent this, if the space between the upper and lower mounting plates 41 and 42 is widened, the main body case 44 becomes larger and the overall size becomes more compact.

An object of the present invention is to divide the circuit components for high-frequency lighting of a discharge lamp into two groups, to attach each group to a separate mounting plate, and to arrange the mounting plates so that the circuit components mounted thereon face each other outward. To provide a lighting fixture which is assembled in a superposed manner in a main body case, thereby reducing the size of the whole, suppressing the temperature rise of housed circuit parts, and obtaining stable high-frequency lighting.

The present invention will be explained below with reference to an embodiment shown in FIG. Note that parts corresponding to those shown in FIGS. 2 and 3 are designated by the same reference numerals, and explanations thereof will be omitted. The device according to the invention also includes, within the instrument case 44,
Two mounting plates 41, 4 made of printed wiring boards, etc.
2 are provided, and are supported and fixed in two stages, upper and lower, with fixing screws 49. These mounting plates 41 and 42 have the circuit components shown in FIG. 1 for lighting the discharge lamp 26 at high frequencies divided into two groups. For example, the upper mounting plate 41 includes the rectifier 11, which is the primary side circuit component of the inverter transformer 20 shown in FIG. establish. The lower mounting plate 42 also includes an inverter transformer 2 shown in FIG.
Output circuit components provided in the secondary circuit of 0, ie, a dimming inductor 27, a balancer 28, a filament transformer 30, etc. are provided. The discharge lamp 26 in the lamp 46 is provided at the tip of the arm 45 by a lead wire 47 drawn out from below the mounting plate 42.
Connect it and turn it on.

Here, in the present invention, when assembling the two mounting plates 41 and 42 within the main body case 44, they are assembled in a stacked manner so that the circuit components disposed thereon respectively face outward. With this configuration, no circuit components are located between the two mounting plates 41 and 42, so there is no problem even if the distance between the plates is narrowed. In addition, the circuit components arranged on each mounting plate 41, 42 are not surrounded by hard objects at close intervals, and a relatively wide space up to the inner surface of the main body case 44 can be used as a heat dissipation space. The increase will not be as high as before. Furthermore, since the distance between the two mounting plates 41 and 42 becomes narrower,
The connecting wire between them may be short, and the wiring inside the narrow main body case 44 can be arranged in an orderly manner. In addition,
Providing ventilation holes 50, 50, . . . in the upper and lower parts of the instrument case 44 further increases the heat dissipation effect.

As described above, according to the present invention, the circuit components for lighting a discharge lamp at high frequency are divided into two groups, and they are arranged on separate mounting plates, and when mounted inside the main body case, these circuit components are divided into two groups. the mounting plate,
Since the circuit components arranged there are assembled in a stacked state so that they face each other outward, the heat radiation of each circuit component is not blocked by each other's mounting plates, and the temperature rise can be suppressed to a low level. The connecting wires between the lamps are shortened, and a lighting fixture that is further miniaturized overall can be provided.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing a high-frequency lighting circuit for a typical discharge lamp, Figure 2 is a perspective view of a typical chandelier-type multi-lamp lighting fixture, and Figure 3 is a sectional view of a conventional lighting fixture. , FIG. 4 is a sectional view of a main part showing an embodiment of a lighting fixture according to the present invention. 11, 14, 16, 20, 27, 28, 30...
Circuit components, 13... Inverter, 26... Discharge lamp, 4
1, 42...Mounting plate, 44...Main case.

Claims (1)

[Claims] 1. Circuit components for a lighting circuit for lighting a discharge lamp at high frequency are divided into two groups, each group is arranged on a separate mounting plate, and these mounting plates are arranged there. A lighting device characterized in that the circuit components are stacked in a main body case so that they face each other outward. 2. The lighting fixture according to claim 1, characterized in that a printed wiring board is used as the mounting plate. 3. The lighting device according to claim 1 or 2, characterized in that a lighting circuit having a push-pull inverter is used as a lighting circuit for high-frequency lighting.