JPS6338526Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a light bulb-shaped envelope equipped with a base that integrally houses an arc tube and an electronic lighting device for lighting the arc tube. It relates to a light lamp device.

[Technical background of the invention and its problems]

Recently, fluorescent lamp devices have been put into practical use as a light source to replace incandescent light bulbs from the perspective of power saving. It is becoming widespread as a. This fluorescent lamp device consists of a bulb-shaped envelope consisting of a cover with a base at one end and a globe attached to the cover, and a saddle-shaped arc tube and the arc tube. It has a structure that integrally houses a lighting device to turn on the light, making it a light source similar to the image of a light bulb. This lighting device generally used a circuit using a glow starter and a chiyoke ballast type ballast, but recently, in order to improve luminous efficiency, devices using electronic applied circuits such as high frequency lighting devices have been introduced. It is being developed.

When this high-frequency lighting device is built into an envelope, various circuit elements such as capacitors, transistors, resistors, and oscillation transformers that make up each circuit of this device are mounted on a circuit board, and this circuit board is connected to the luminous tube. A conceivable structure is to arrange the structure in a space surrounded by both end portions and a curved portion located adjacent to the curved portion.

However, when the lamp is lit, the inside of the envelope reaches a high temperature of approximately 150° C. due to radiant heat from the arc tube and lighting device, and this heat causes the temperature of the circuit elements to rise to a high temperature. In particular, when the lighting device is installed in a position surrounded by the arc tube, the thermal effect on the circuit elements is even greater, and as a result, the transistors and capacitors that are sensitive to heat will be damaged early, and the lighting device itself will be short-lived. Problems such as reaching the end of its service life may occur.

Note that in order to make the lighting device operate normally in the high-temperature atmosphere as described above, the core material for the inductance of the circuit element is to use a material with a Cuyuri temperature of 180°C or higher considering the safety factor, or to reduce the saturation magnetic flux. It is possible to use a high-density inductance component, but since there are few such circuit elements on the market, they are not only expensive but also difficult to obtain, making them unsuitable for practical use.

[Purpose of invention]

The present invention was developed based on these circumstances, and its purpose is to protect the thermally weak elements among the circuit elements on the circuit board from the radiant heat of the arc tube. It is an object of the present invention to provide a fluorescent lamp device in which the arrangement of circuit elements is flexible, the thermal influence between the circuit elements is reduced, and the lighting device can operate normally for a long period of time.

[Summary of the idea]

That is, in the present invention, the circuit board is composed of two or more divided pieces, and these divided pieces are arranged one on top of the other with a space between them, and among these divided pieces, the divided piece closer to the arc tube In addition, the above object is achieved by selecting and attaching thermally strong circuit elements among the circuit elements, and attaching thermally weak circuit elements to other divided pieces apart from the arc tube.

[Example of idea]

The present invention will be explained below based on an embodiment shown in the drawings.

In the figure, reference numeral 1 denotes a cover made of synthetic resin, which is formed into a substantially bowl shape with a circumferential surface shaped like a paraboloid of revolution. A screw-type cap 2 such as an E26 type cap is attached to the top of one end of the cover 1, but the cap 2 is not limited to the screw-in type, and may be a plug-in type or a sealing type. The opening at the other end of the cover 1 is covered with a light-transmitting glove 3. The globe 3 has a substantially spherical shape, and the cap of the globe 3 forms an envelope 4 whose appearance resembles a ball-shaped incandescent light bulb. The envelope 4 houses an arc tube 5 and a high frequency lighting device 6 as an electronic lighting device for lighting the arc tube 5.
The arc tube 5 of this embodiment has a first curved portion 9 formed by bending a straight bulb having electrodes 7, 7 at both ends into a substantially U-shape at the center between the two ends 8, 8. At the same time, a pair of second curved parts are formed by bending the first curved part 9 and both end parts 8, 8 into a substantially U-shape in a direction substantially orthogonal to a plane including the U-shape. 10,
10, and by bending these two times, both end portions 8, 8 and the first curved portion 9 are positioned adjacent to each other in the same direction, and the overall shape resembles a saddle for horseback riding. Because of this, it is called a saddle-shaped arc tube.
A phosphor coating is applied to the inner surface of the arc tube 5, and a predetermined amount of mercury and an inert gas are sealed inside the tube. The arc tube 5 having the above shape is supported within the globe 3 with its both ends 8, 8 and the first curved portion 9 facing the cover 1 side. Although this support structure is not shown in detail, in this embodiment, a pair of support walls 11 and 12 are erected on the inner peripheral surface of the cover 1 so as to be spaced apart from each other in the radial direction. , 8 to one supporting wall 11
The first curved portion 9 is fixed in the above-mentioned position by being pushed into both sides of the positioning portion 13 provided on the other support wall 12, and by fitting the first curved portion 9 between the locking pieces 14 provided on the other support wall 12.

On the other hand, since the high frequency lighting device 6 is already known, a detailed explanation thereof will be omitted.
As shown in the block diagram of FIG. 2, the main components include a line filter circuit 15, a full-wave rectifier circuit 16, a power supply smoothing capacitor 17, and a high frequency conversion circuit 18. That is, this lighting device 6 converts the AC cycle of the AC power supply 19 into the line filter circuit 1.
5, is converted into a direct current by a full-wave rectifier circuit 16 and a power supply smoothing capacitor 17, and outputted.Furthermore, this output voltage is converted into a high-frequency voltage by a high-frequency conversion circuit 18 and output. Such a high frequency lighting device 6 is connected to the arc tube 5 via a single yoke coil ballast 20.

By the way, various circuit elements constituting each circuit as described above are mounted on the circuit board 21.
This circuit board 21 is made up of two divided pieces 22, 2, for example.
These divided pieces 22 and 23 are connected by a plurality of connectors 24 so as to be separated from each other and overlap each other. Therefore, a certain space 25 is formed between the divided pieces 22 and 23. Such a circuit board 21 is attached to the support wall 1.
The cover 1 is clamped and fixed between 1 and 12 so as to be substantially parallel to the plane including the opening at the other end of the cover 1.
Therefore, the circuit board 21 is connected to both ends 8, 8 of the arc tube 5.
and the first curved portion 9 so as to be substantially parallel to a plane containing these end portions 8, 8 and the first curved portion 9. And the divided pieces 22, 23
Each of the above-mentioned circuit elements is attached to the surface opposite to the arc tube 5. Among the divided pieces 22 and 23, the divided piece 22 closer to the arc tube 5 has a resistor 26 and a resistor 26 which are thermally strong among the circuit elements. Diodes 27 are installed in a concentrated manner. In this case, the resistor 26 and the diode 27 are also parts that can be automatically inserted into the divided piece 22, and therefore the divided piece 22 and the circuit elements are assembled by an automatic machine rather than by hand. In addition, the other divided piece 23 has the resistor 26
Transistor 2, which is thermally weaker than circuit elements such as
8 and capacitors 31 are installed in a concentrated manner. In addition, the coil 29 and capacitor 31, which are parts other than these, are neither strong nor weak thermally, but because the parts are large in size, the split piece 23 on the base side
is attached to. Further, although not used in this embodiment, a thyristor is not weak in terms of heat, but it cannot be said to be particularly strong, and it may be attached to either of the divided pieces. The tall capacitor 31 is located in the center of the divided piece 23, and its tip end is connected to the base 2.
inserted inside. The circuit elements on each divided piece 22, 23 are electrically connected by a circuit pattern formed on each divided piece 22, 23. The divided pieces 22 and 23 are also electrically connected to each other, but in the case of this embodiment, the connectors 24 are made of a conductive material and the connectors 24 also serve as a power supply function. Through this connection, the various circuit elements described above are electrically connected to form a predetermined circuit configuration.

Incidentally, reference numeral 30 indicates a starting circuit mainly composed of circuit elements such as a side cap and a diode, and this circuit element is attached to either of the divided pieces 22 and 23.

According to such a configuration, the circuit board 21 is provided with two divided pieces 22 and 23 superimposed, and the thermally weak transistor is placed on the divided piece 23 on the side away from the arc tube 5 among these divided pieces 22 and 23. Since a circuit element such as 28 is attached, the influence of heat from the arc tube 5 on this circuit element is reduced. Further, the divided piece 22 of the arc tube 5 functions as a heat shield plate for the divided piece 23, and the divided piece 22, 2
Since the space 25 between the arc tubes 3 also functions as a heat insulating air layer, the above-mentioned thermal influence is reduced, and the heat-sensitive circuit elements can be reliably protected from the radiant heat of the arc tube 5.

In addition, the circuit elements that were conventionally mounted on a single circuit board are now distributed and arranged on the two divided pieces 22 and 23, so there is no extra circuit element arrangement on each divided piece 22 and 23. Yu was born and circuit elements can be placed apart from each other. Therefore, not only the thermal influence between circuit elements is reduced, but also the circuit board 21
It becomes difficult for heat to accumulate on top. At the same time, as shown in Figure 4, tall coils 29 and capacitors 3
The first class circuit element can be placed on the divided piece 22 in a horizontal state. If you do this,
The entire circuit board 21 can be placed closer to the base 2 than in the above position, in other words, it can be placed away from the arc tube 5, which reduces the thermal influence from the arc tube 5 and improves reliability. There are advantages such as improved performance.

In carrying out the present invention, the number of divided pieces is not limited to two, but may be three or more, and the shape of the arc tube is not limited to a saddle shape, but may be U-shaped. .

Further, the lighting device is not limited to the high-frequency lighting method, and may be a phase control method or a half-cycle ignition method, for example, as long as it is a lighting device using an electronic circuit.

[Effect of idea]

The present invention described in detail above includes:
In a fluorescent lamp device in which an electronic lighting device is housed together with an arc tube, the circuit board of the lighting device is composed of a plurality of divided pieces, and these divided pieces are overlapped with each other with a space between them. A thermally strong circuit element is attached to the divided piece closer to the arc tube, and a thermally weaker circuit element is attached to another divided piece away from the arc tube.
According to this device, not only does the heat influence from the arc tube on the thermally weak circuit elements be reduced, but also the split piece near the arc tube functions as a heat shield, and the space between the split pieces is filled with heat insulating air. fulfills the function of layers,
Therefore, the heat-sensitive circuit elements can be reliably protected from the radiant heat of the arc tube, and the reliability of the lighting device is improved. In addition, since there is a margin in the arrangement of the circuit elements on the divided piece, these circuit elements can be placed apart, which reduces the thermal influence between the circuit elements and makes it difficult for heat to accumulate on the divided piece. There is an effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a lighting circuit diagram, and FIGS. 3 and 4 are side views of a lighting device. 2...cap, 4...envelope, 5...luminous tube, 6
...Electronic lighting device (high frequency lighting device), 21...
Circuit board, 22, 23... divided piece, 25... space, 26, 27, 28, 29... circuit element.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A fluorescent lamp device comprising an electronic lighting device configured by mounting an arc tube and various circuit elements on a circuit board in an envelope equipped with a cap, The above-mentioned circuit board is constructed by stacking a plurality of divided pieces on top of each other with spaces between these divided pieces, and among the above-mentioned divided pieces, one of the divided pieces closer to the arc tube is thermally A fluorescent lamp device characterized in that strong circuit elements are selected and attached, and thermally weak circuit elements are attached to another divided piece separate from the luminous tube. (2) The above-mentioned arc tube has a straight tube-shaped bulb bent into a substantially U-shape at the center between its two ends, and is substantially perpendicular to a plane containing the U-shape at the center between this bent part and both ends. It is curved in a substantially U-shape in the direction, and has a saddle shape in which both ends and the curved portion are located adjacent to each other in the same direction, and in a space portion surrounded by the both ends and the curved portion, 2. The fluorescent lamp device according to claim 1, wherein the circuit board is arranged so as to be substantially parallel to a plane including both end portions and the curved portion.