JP3767680B2 - Light bulb shaped fluorescent lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bulb-type fluorescent lamp including a bulb in which a discharge path is formed by at least three substantially U-shaped and substantially identical tubular bodies.
[0002]
[Prior art]
Conventionally, as this type of bulb-type fluorescent lamp, for example, three or more substantially U-shaped tubes are sequentially connected to form a bulb having a bent discharge path, and electrodes are sealed at both ends of the bulb. One using an arc tube is known.
[0003]
In such a bulb-type fluorescent lamp, there is a demand for downsizing the arc tube of the bulb-type fluorescent lamp and a lighting circuit for lighting the arc tube. For this reason, even the arrangement relationship between the arc tube and the lighting substrate is included as an important design item for miniaturization.
[0004]
In addition, this bulb-type fluorescent lamp uses an arc tube using a tube having an outer diameter of about 10 mm and has a shape similar to an A-type incandescent bulb having an E26 base. Along with the widespread use of small light bulbs having a base, further contrivance is required for designing as a substitute for the small light bulb having the E17 base.
[0005]
[Problems to be solved by the invention]
However, in order to use this bulb-type fluorescent lamp as a substitute for a small bulb with an E17 cap, a thin tube is provided at the end of the bulb of the bulb-type fluorescent lamp. There is a problem that it is not easy.
[0006]
This invention is made | formed in view of such a point, and it aims at providing the bulb-type fluorescent lamp which can be reduced more in size.
[0007]
[Means for Solving the Problems]
The bulb-type fluorescent lamp according to claim 1 is configured such that at least three substantially U-shaped and substantially identical tube bodies are juxtaposed in a direction perpendicular to a plane formed by these tube bodies to form a discharge path therein. The constructed valve, the first narrow tube provided at the end of the tubular body located in the central region of the valve, and shorter than the first thin tube provided at each end of each tubular body located at both end regions of the valve A second thin tube and an arc tube having electrodes sealed at both ends of the bulb; a lighting circuit for lighting the arc tube; a cover for supporting the arc tube and containing the lighting circuit; and attached to the cover Each tube body has an outer diameter of less than 10 mm, and the tube diameter of the first capillary tube is larger than the tube diameter of the second capillary tube .
[0008]
In this configuration, at least three substantially U-shaped and substantially identical tubular bodies are juxtaposed in a direction perpendicular to the plane formed by the tubular body, and a discharge path is formed inside. The second thin tube provided at each end of each tubular body located in both end regions is made shorter than the first thin tube provided at the end of the tubular body located in the central region of the valve. As a result, the normal bulb-type fluorescent lamp is formed in a rotating body centered on the base axis. Therefore, when the arc tube is arranged in the middle of the cover, the central area of the bulb is less Since it is in a distant position, an accommodation space can be easily secured, and for example, amalgam can be sealed in the first thin tube of the valve. Therefore, further downsizing is possible.
[0009]
Furthermore, in this configuration, even if the first narrow tube of the valve having a tubular body having an outer diameter of less than 10 mm is made longer than each of the second thin tubes, there is hardly a problem in designing, so that the size can be further reduced. Become. Further, since the diameter of the first thin tube is larger than the diameter of the second thin tube, the exhaust can be efficiently performed. Since the diameter of the second thin tube is smaller than the diameter of the first thin tube, an electrode is provided at the same end. Can be sealed.
[0010]
Bulb-type fluorescent lamp of claim 2, wherein, in the self-ballasted fluorescent lamp according to claim 1 Symbol placement, the first capillary and the second capillary are those wherein stem seal.
[0011]
In this configuration, the first narrow tube and the second thin tube can be made shorter by using the first narrow tube and the second thin tube as a stem seal, so that the size can be further reduced. It becomes.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[0013]
1 to 5 show a first embodiment of the present invention. FIG. 1 is a top view of an arc tube of a bulb-type fluorescent lamp, FIG. 2 is a side view of the bulb-type fluorescent lamp, and FIG. FIG. 4 is a sectional view of an end portion of the arc tube, and FIG. 5 is a sectional view of a pinch seal.
[0014]
In FIG. 2, 1 is a bulb-type fluorescent lamp, and the bulb-type fluorescent lamp 1 has a size that fits within a virtual cylinder having an outer diameter of 55 mm and a height of 100 mm. The bulb-type fluorescent lamp 1 includes an envelope having a cover 2, a base 3, and a globe 4. In this envelope, a fluorescent lamp device having an arc tube 5 and a lighting circuit 6 is accommodated. The envelope has an external shape approximating the standard size of a mini-krypton type bulb, for example, the height dimension from the base 3 to the globe 4 is about 81 mm, and the width corresponding to the maximum diameter portion of the globe 4 The direction dimension is about 45 mm. In the following description, one end side of the cover 2, that is, the base 3 side is set as the upper side, and the other end side, that is, the glove 4 side is set as the lower side.
[0015]
The cover 2 is formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT).
[0016]
Further, the base 3 is an Edison type E17 type or the like and is placed on the upper end portion of the cover 2 and fixed by an adhesive or caulking.
[0017]
Further, the globe 4 is transparent or milky white having light diffusibility, etc., and is formed of glass or synthetic resin into a substantially spherical shape that approximates the shape of the glass sphere of a mini-krypton type bulb, and has an opening in part. 11 is formed. The globe 4 can be combined with another member such as a diffusion film to improve the uniformity of luminance, or can be omitted.
[0018]
Further, the arc tube 5 has a glass bulb 12 as shown in FIGS. For example, a three-wavelength phosphor is applied to the inner surface of the bulb 12. In addition, the bulb 12 is filled with a noble gas such as argon or a gas containing mercury. Furthermore, a pair of electrodes 23 are sealed at both ends of the valve 12 by, for example, pinch seals.
[0019]
The valve 12 includes three substantially identical tubular bodies 13a, 13b, and 13c. These tubes 13a, 13b, and 13c have, for example, tube outer diameters of less than 10 mm, for example, 8 mm, tube inner diameters of 5 mm or more, and glass-made substantially cylindrical tubes that are curved at the intermediate portion and have top portions. It is formed in a substantially U shape. That is, each of these tubular bodies 13a, 13b, and 13c includes a bent portion 14 that is curved, and a pair of straight pipe portions 15 that are continuous with the bent portion 14 and are substantially U-shaped. The tube length in the height direction between the bent portion 14 and the end portion is formed to be about 40 mm. Each tubular body 13a, 13b, 13c has a width of 26 mm in a substantially U-shape.
[0020]
Further, adjacent end portions of the tube bodies 13a, 13b, and 13c are sequentially connected by the communication tube 16 to form one continuous discharge path 17. The tube bodies 13a, 13b, and 13c are arranged side by side in a direction perpendicular to the plane formed by the tube bodies 13a, 13b, and 13c, and a discharge path 17 is formed therein. The communication pipe 16 is formed by joining openings formed by blowing and tearing ends connected to the pipe bodies 13a, 13b, and 13c. The straight tube portions 15 of the tubular bodies 13a, 13b, 13c are positioned at equal intervals on the same circumference around the central axis of the bulb-type fluorescent lamp 1, that is, the tubular bodies 13a, 13b, 13c. The straight pipe portion 15 is arranged corresponding to each vertex of the hexagonal section.
[0021]
Each tube body 13a, 13b, 13c is sealed at one end by a line seal using a mount or a pinch seal not using a mount. Further, at the other end of the tube body 13b located in the central region, a thick first thin tube 21 for exhaust, also called an exhaust tube, is provided in a projecting state by a stem seal. The first thin tube 21 has an outer diameter of about 4 mm, for example. In addition, cylindrical second thin tubes 22a and 22b project from the other end portions of the tube bodies 13a and 13c located in the both side areas in a communicating state by stem seals. Here, the first thin tube 21 is located closer to the center of gravity of the valve 12 than the second thin tubes 22 a and 22 b in the cross section of the valve 12. That is, the first narrow tube 21 is provided at a position closest to the center of gravity of the valve 12 in a state where the end portions of the respective tubes 13a, 13b, and 13c are disposed at a distance from the center of gravity in the cross-sectional direction.
[0022]
The second thin tubes 22a and 22b are narrower than the first thin tube 21, have an outer diameter of, for example, 2 mm, and project from the end portion where the electrode 23 is sealed. As shown in FIG. 3, these first narrow tube 21 and second thin tubes 22a, 22b are sequentially sealed by fusing in the manufacturing process of the valve 12, and these first thin tube 21 and second thin tubes 22a, 22b, After exhausting the inside of the valve 12 through an unsealed part of 22b, and after the sealed gas is sealed and replaced, the first capillary 21 and the second capillary 22a, 22b It is sealed by fusing a part that is not sealed.
[0023]
Furthermore, each electrode 23 has a filament coil 24 which is a hot cathode coil, and this filament coil 24 is supported by a pair, that is, two linear wells 25. The wells 25 are led out to the outside of the ends of the tubes 22a, 22b at both ends, for example, via jumette wires sealed by stem seals at the ends of the tubes 22a, 22b at both ends, to the lighting circuit 6. It is connected to the wire 26 to be connected.
[0024]
And the main amalgam 27 as an amalgam is enclosed in the 1st thin tube 21 of the tube 13b of a center area, when this 1st thin tube 21 is sealed. The main amalgam 27 is an alloy composed of bismuth, indium and mercury, is formed in a substantially spherical shape, and has an action of controlling the mercury vapor pressure in the bulb 12 within an appropriate range. In addition, as the main amalgam 27, what was formed with the alloy which combined tin, lead, etc. other than bismuth and indium may be used. In addition, an auxiliary amalgam 28 as an amalgam having mercury vapor pressure characteristics similar to that of the main amalgam 27 is attached to one well 25 of the electrode 23 of each tubular body 13a, 13c at both ends.
[0025]
Further, as shown in FIG. 2, the lighting circuit 6 includes a substantially disk-shaped substrate 31 disposed on the cover 2, and both surfaces of the substrate 31, that is, the upper surface on the base 3 side and the lower surface on the arc tube 5 side. In addition, a plurality of electrical components are mounted to constitute a high-frequency lighting circuit that is an inverter circuit for lighting the arc tube 5 at high frequency.
[0026]
And, on the upper surface of the substrate 31, electrical parts 32 such as a large electrolytic capacitor and a film capacitor that are relatively heat-sensitive, that is, heat resistance is low, and the lower surface are relatively heat-resistant, That is, a rectifying circuit (REC) such as a rectifying element having a high heat resistance and a small height or a diode bridge, and a chip part (not shown) such as a chip-like electric part such as a transistor and a resistor are arranged. Further, the substrate 31 is fixed inside the cover 2.
[0027]
The bulb-type fluorescent lamp 1 configured as described above has an input power rating of 10 W, and a total luminous flux of 480 lm can be obtained by using a three-wavelength light emitting phosphor.
[0028]
Then, when the bulb-type fluorescent lamp 1 is turned off, power is supplied to the base 3, so that the lighting circuit 6 applies a lamp lighting voltage between the electrodes 23 at both ends of the bulb 12 to light the arc tube 5. .
[0029]
Thus, even when the first thin tube 21 and the second thin tubes 22a and 22b are formed as a bulb-type fluorescent lamp 1 having the same mount height, as shown in FIG. Although it is possible to burn out at the limit, as shown in FIG. 5, the pinch seal has a risk of cracks in the pinch portion, and it will be at least 6 or 7 mm.
[0030]
It is also possible to provide a hole in the lighting circuit 6 and allow the first thin tube 21 and the second thin tubes 22a and 22b to pass through the hole. It becomes narrower.
[0031]
As a result, it is preferable that each of the first narrow tube 21 and the second thin tubes 22a and 22b be short so as not to hit the lighting circuit 6 when accommodated in the cover 2. For this reason, the first narrow tube 21 and the second narrow tubes 22a, 22b are replaced with the stem seals shown in FIG. 4 rather than the pinch seals shown in FIG. Each 22b can be made shorter.
[0032]
In addition, when the tube diameters of the tube bodies 13a, 13b, and 13c of the valve 21 are about 6 mm in inner diameter, the first narrow tube 21 and the second thin tubes 22a and 22b are inevitably taken into consideration when the wells 25 are taken into consideration. The outer diameter is about 2 mm.
[0033]
When the outer diameter of each of the first thin tubes 21 and the second thin tubes 22a, 22b is about 2 mm, it is sufficient for air blowing in the connecting step of the tubes 13a, 13b, 13c. To exhaust, it is too thin and the exhaust time becomes longer, or the ultimate vacuum in the valve 21 becomes worse.
[0034]
Further, the second thin tubes 22a and 22b located in the both end regions can be cut short, and further, the first thin tube 21 located in the central region does not have the electrode 23 and can be made thick. The narrow tube 21 can efficiently exhaust the gas, and the main amalgam 27 can be sealed in the first thin tube 21.
[0035]
Further, since each of the second thin tubes 22a and 22b is narrower and shorter than the first thin tube 21, the electrode 23 can be sealed at each end of the tubes 13a and 13c forming the second thin tubes 22a and 22b.
[0036]
Therefore, by making the second thin tubes 22a and 22b provided at both end regions of the bulb 21 shorter than the first thin tube 21 located in the central region of the bulb 21, the normal bulb-type fluorescent lamp 1 has the base 3 axis. Since the arc tube 5 is formed in the center of the cover 2, the central area of the bulb 21 is located farther from the cover 2 than the both end areas of the bulb 21. As a result, the accommodation space can be easily secured, so that the size can be further reduced.
[0037]
Further, since the first thin tube 21 is located closer to the center of gravity of the valve 12 than the second thin tubes 22a and 22b, the first thin tube 21 is more geometrically than the second thin tubes 22a and 22b. It will be located in the central area. Here, in the positional relationship between the valve 12 and the cover 2, the narrow tube can be made longer than the central region. Therefore, even if the first thin tube 21 is longer than the second thin tubes 22a and 22b, there is no problem in housing, so that the size can be further reduced.
[0038]
In addition, since the first narrow tube 21 of the valve 12 having the tube bodies 13a, 13b, 13c having an outer diameter of less than 10 mm is longer than the second thin tubes 22a, 22b, there is no problem in designing. Even a bulb-type fluorescent lamp 1 using such a bulb 21 can be further downsized.
[0039]
In order to replace the bulb-type fluorescent lamp 1 with a bulb mounted on the E17 base, it is necessary to have a size that can be accommodated in a virtual cylinder having an outer diameter of 55 mm and a height of 100 mm. The road 17 and the lighting circuit 6 must be combined.
[0040]
The lighting circuit 6 includes relatively large components such as windings and film capacitors disposed on the upper surface of the substrate 31 and relatively small components such as chip resistors disposed on the lower surface of the substrate 31. However, in order to effectively arrange these many components in a narrow space, it is preferable to use a plurality of substrates 31 electrically connected.
[0041]
However, since the manufacturing process becomes complicated when the number of substrates 31 is large, it is preferable to place the back sides of the two substrates 31 so as to face each other. Conventionally, the substrate is disposed so that the solder surface faces the arc tube side, but it is difficult to manufacture a large component on the solder surface. That is, chip resistors, diode parts, and the like are placed on the solder surface side, because these move in a high temperature liquid phase solder basket in the manufacture of mass-produced industrial products, for example, electrolytic capacitors, film capacitors, Discrete parts such as choke coils cannot be placed on the solder surface.
[0042]
Even if two substrates 31 are used in the lighting circuit 6, the entire bulb-type fluorescent lamp 1 can be reduced in size by arranging some components so as to be inserted inside the arc tube 5. However, these parts need heat resistance of a certain level or more, and are desirably choke ballasts, transistors, diodes, resistance parts, and the like.
[0043]
It is also effective to place these components away from the electrodes and to install a heat shield plate between these components and the arc tube 5. However, even if this heat shield is installed, the temperature in the arc tube 5 becomes high, so it is desirable that the lamp power of the arc tube 5 be 14 W or less.
[0044]
Next, FIG. 6 and FIG. 7 show a second embodiment, in which FIG. 6 is an explanatory diagram of a bulb-type fluorescent lamp, (a) is a perspective view of a light-emitting tube, and (b) is a side view of the bulb-type fluorescent lamp. FIG. 7 is a graph of the luminous flux maintenance factor with respect to the lighting time.
[0045]
The bent portion 14 of the bulb 12 of the bulb-type fluorescent lamp 1 occupies a range of 20% or less of the entire sealing length of the bulb 12. In the present embodiment, the total of the bent portions 14 is about 15% of the total length. Each of the bent portions 14 of the bulb 12 is provided at a total of six locations by locally bending a straight tubular glass tube 41. Further, the inner diameter of each of the tubes 13a, 13b, 13c of the valve 12 is 9 mm or less, specifically 6 mm.
[0046]
As a result, the bulb 12 is formed with a discharge path 17 having three substantially U-shaped tubes 13a, 13b, and 13c by bending the glass tube 41.
[0047]
Here, after forming each tubular body 13a, 13b, 13c into a U shape, a protective film and a phosphor film (not shown) are formed on the inner surface of each tubular body 13a, 13b, 13c. During bending of the glass tube 41, the phosphor film is damaged by heat and cracks occur, causing mercury oxide to react with the glass and accumulate during lighting, i.e., causing a decrease in luminous flux maintenance factor It becomes. The decrease in the luminous flux maintenance factor is caused by the tube diameter of the glass tube 41, the curvature of the bent portion 14, and the range of the bent portion 14.
[0048]
In the case of the valve 12 formed by sequentially connecting the substantially U-shaped tubes 13a, 13b, and 13c, there is a process after the tubes 13a, 13b, and 13c are connected. This is disadvantageous in terms of production speed and capital investment.
[0049]
Therefore, by forming the bulb 12 by bending a straight glass tube 41 having an inner diameter dimension of 9 mm or less so that the bent portion 14 occupies a range of 20% or less of the entire sealing length, As shown in FIG. 7, when this bulb is lit for 2000 hours, an improvement of 10 points is obtained compared to the conventional bulb 12 in which substantially U-shaped tubes 13a, 13b, 13c are sequentially connected. The luminous flux maintenance factor can be improved.
[0050]
Further, by making each bent portion 14 at a right angle, it is easy to determine the dimensions when manufacturing the valve 12.
[0051]
【The invention's effect】
According to the light bulb shaped fluorescent lamp according to claim 1, at least three substantially U-shaped and substantially identical tubes are juxtaposed in a direction perpendicular to a plane formed by the tubes to form a discharge path therein. The second narrow tube provided at each end of each tubular body located in both end regions of the valve configured as described above is made shorter than the first thin tube provided at the end of the tubular body located in the central region of the valve. Therefore, a normal bulb-type fluorescent lamp is formed in a rotating body centered on the base axis. Therefore, when the arc tube is arranged in the middle of the cover, the central area of the bulb is farther from the cover than the both end areas of the bulb. Therefore, the accommodation space can be easily secured, and for example, amalgam can be sealed in the first thin tube of the valve, and the size can be further reduced.
[0052]
Further, since it is difficult to design a valve even if the first narrow tube of the valve having a tube having an outer diameter of less than 10 mm is longer than each of the second thin tubes, the size can be further reduced. Since the tube diameter of the thin tube is larger than the tube diameter of the second thin tube, it is possible to exhaust efficiently. Since the tube diameter of the second thin tube is smaller than the tube diameter of the first thin tube, the electrode can be sealed at the same end.
[0053]
According to the self-ballasted fluorescent lamp according to claim 2, wherein, in addition to the effects of claim 1 Symbol mounting of compact fluorescent lamp, by a first capillary and a second capillary in the stem seal, these first capillary Since each of the second thin tubes can be made shorter, the size can be further reduced.
[Brief description of the drawings]
FIG. 1 is a top view of an arc tube of a bulb-type fluorescent lamp showing a first embodiment of the present invention.
FIG. 2 is a side view showing the same bulb-type fluorescent lamp.
FIG. 3 is an explanatory view showing a manufacturing process of an arc tube of the bulb-type fluorescent lamp.
FIG. 4 is a cross-sectional view showing an end portion of the same arc tube.
FIG. 5 is a cross-sectional view showing a pinch seal.
FIG. 6 is an explanatory diagram showing a bulb-type fluorescent lamp according to a second embodiment of the present invention.
(a) Perspective view of arc tube
(b) Side view of the bulb-type fluorescent lamp FIG. 7 is a graph of the luminous flux maintenance factor with respect to the lighting time of the bulb-type fluorescent lamp.
[Explanation of symbols]
1 Light Bulb Fluorescent Lamp 2 Cover 3 Base 5 Arc Tube 6 Lighting Circuit
12 Valve
13a, 13b, 13c tube
17 Discharge path
21 First capillary
22a, 22b Second capillary
23 electrodes

Claims (2)

A bulb configured so that at least three substantially U-shaped and substantially identical tube bodies are juxtaposed in a direction perpendicular to a plane formed by these tube bodies to form a discharge path therein; Sealed at both ends of the first thin tube provided at the end of the tube located, the second thin tube provided at each end of each tube located at both ends of the valve, and shorter than the first thin tube An arc tube having a formed electrode;
A lighting circuit for lighting the arc tube;
A cover that supports the arc tube and contains a lighting circuit;
A base attached to this cover;
Comprising
Wherein each tube has an outer diameter of less than 10 mm,
The first of said the tube diameter of the capillary second feature and the conductive spherical fluorescent lamp that is larger than the tube diameter of the capillary. First capillary and the second capillary, claim 1 Symbol mounting of compact fluorescent lamps were characterized by a stem seal.

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