JP2005050757A - Compact self-ballasted fluorescent lamp and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp in which the temperature in the globe space is reduced in order to reduce failure of the lighting device due to thermal effect from the fluorescent lamp which becomes high temperature during lighting, and reliability is enhanced. <P>SOLUTION: Since the fluorescent lamp is covered by a material which can release outside of the globe much of the infrared rays emitted by the compact self-ballasted fluorescent lamp during lighting, the temperature rise in the globe is suppressed, and by suppressing the temperature of a diaphragm and temperature rise in a cover body, melting of the holder made of resin and heat breakage or the like of the electronic components mounted on the lighting device can be suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bulb-type fluorescent lamp and a lighting fixture in which a lighting device and a fluorescent lamp are accommodated by a cover body and a globe.

  The bulb-type fluorescent lamp is configured, for example, by supporting a fluorescent lamp formed with a single discharge path by connecting a plurality of bent arc tubes to a cover body. This cover body has a base on one side, supports a fluorescent lamp on the other side, and houses a lighting device for lighting the fluorescent lamp.

Such a bulb-type fluorescent lamp is desired to be further miniaturized in order to approximate the appearance of an incandescent bulb for general lighting. However, in a bulb-type fluorescent lamp in which the fluorescent lamp is covered with a globe, the space inside the globe rises. There is a tendency. The bulb-type fluorescent lamp thus miniaturized has a compact overall appearance, and the distance between the lighting device housed inside the cover body and the fluorescent lamp is also reduced. The lighting device is easier to receive. On the other hand, a bulb-type fluorescent lamp that is close to the size of a general-use incandescent bulb by defining optimum conditions for thermal influence on the lighting device and miniaturization is known (for example, Patent Document 1). .
JP 2000-21207 A

  Patent Document 1 discloses a light bulb shape that defines an optimal air layer between a fluorescent lamp in a cover body and a lighting device, thereby reducing the size and suppressing the thermal influence on the lighting device. An object of the present invention is to provide a fluorescent lamp. However, as the heat generated from the fluorescent lamp, which is the main heat source during lighting, is reduced in size to approximate the appearance of an incandescent light bulb for general illumination, the space in the container is narrowed and is likely to become high temperature. As described above, even if the optimum conditions for thermal influence and miniaturization on the lighting device are defined, the lighting device is easily affected by the heat. In other words, the air layer is warmed by the high-temperature space covered with the glove so that the fluorescent lamp, which is the main heat source during lighting, is almost sealed, and the internal space of the cover is also warmed through the air layer, which affects the lighting device. There was a risk of damage.

  The present invention is for solving the above-mentioned problems, and in order to reduce the malfunction of the lighting device due to the heat effect from the fluorescent lamp that becomes high temperature during lighting, the temperature of the space in the globe is reduced and the reliability is increased. An object of the present invention is to provide a self-ballasted fluorescent lamp.

  The bulb-type fluorescent lamp according to claim 1 includes a light emitting tube; a cover body in which a lighting device for lighting the light emitting tube is housed, the light emitting tube is supported on one side, and a base is mounted on the other side; An emissivity of 0.8 or more, and a glove that covers the arc tube and is attached to the cover body.

  The bulb-type fluorescent lamp according to claim 2, comprising: a light emitting tube; and a cover body in which a lighting device for lighting the light emitting tube is accommodated, the light emitting tube is supported on one side, and a base is mounted on the other side; And a glove that is made of a material that transmits 20% or more of infrared rays of 3 μm or more and that covers the arc tube and is attached to a cover body.

  The bulb-type fluorescent lamp according to claim 3 includes: a light emitting tube; a cover body in which a lighting device for lighting the light emitting tube is housed, the light emitting tube supported on one side and a base mounted on the other side; And a globe attached to the cover body so as to cover the arc tube, and having a conductivity of 10 W / m · K or more.

  Therefore, from a thermal point of view, the compact and high-power bulb-type fluorescent lamp has a tendency to increase its power dissipation area with a reduction in the size and output of power. As a result, the amount of heat generated per unit heat radiation area is increasing. In addition, since the lighting device for lighting the fluorescent lamp accommodated in the cover body has recently been made up of electronic components that have been digitized and are weak against heat, the present inventors have important thermal design. Focused on becoming an element.

  It was decided to measure the temperature of a space in which a fluorescent lamp, which is a main heat source of a light bulb-type fluorescent lamp being lit, is covered with a generally used glass globe so as to be almost enclosed. In general, when glass is a transparent glass not mixed with a light diffusing material, the visible light total light transmittance is close to 99% and the absorptance is 1% or less, but the transmission of infrared rays (heat rays) having a wavelength of about 3 μm or more. The rate is several percent, and it has a characteristic of almost completely absorbing. Therefore, when the fluorescent lamp, which is the main heat source during lighting, is covered with a glass globe that does not transmit infrared rays so that it is almost enclosed, the infrared rays (heat rays) emitted by the fluorescent lamp are absorbed or reflected by the glass, The internal space temperature rises. Further, with the further miniaturization of the bulb-type fluorescent lamp, the globe covering the arc tube is also miniaturized, and the temperature in the glove space is accelerated by reducing the glove space. The heat in the glove space is transferred from the glove inner wall to the outer wall by the convection, radiation, and radiation of the glove air, and is dissipated, and the heat is conducted to the cover body space through the resin holder that supports the fluorescent lamp. There is a route to be done. However, although the heat during lighting is dissipated to the outside of the globe due to the heat conduction of the glass globe, the amount of heat in the globe that is conducted from the holder into the cover body and the amount of heat due to convection in the globe is large. There is a concern that the electronic component mounted with a relatively low heat resistance is thermally damaged due to its thermal influence, and that the holder made of a heat resistant resin is melted and thermally deteriorated.

  Therefore, the experiment of verifying the effect of heat radiation from the globe was performed by changing the infrared transmittance, thermal conductivity, input power, and inner volume of the globe of the globe covering the arc tube.

  As a result, if the thermal emissivity is 0.8 or more, even if a fluorescent lamp, which is a heat source covered in a compactly packed globe, is lit with a lamp power of about 7 W to 22 W, it generates heat during lighting. Efficiently radiates out of the globe. On the other hand, if the thermal emissivity is 0.8 or less, it is difficult to efficiently radiate the heat generated in the bulb-type fluorescent lamp, which has been reduced in size and has a small heat dissipation area, to the outside of the globe. There is a risk that the thermal effect will rise and affect the lighting device side.

  Further, in the conventional soda lime glass, the infrared transmittance at a wavelength of 3 μm or more is a value of several percent, so that heat from the fluorescent lamp drifts in the globe and the temperature in the bulb-type fluorescent lamp rises. However, it is possible to efficiently transmit visible light and infrared light by using a globe formed of a material having an infrared transmittance of 3% or more and a wavelength of 20% or more. The temperature inside the globe and the entire inside of the envelope can be transmitted. The temperature can be reduced.

  Furthermore, if it is covered with a glove made of a material with a thermal conductivity lower than 10 W / m · K, it is difficult to efficiently conduct the heat absorbed by the glove to the outside of the glove, reducing the temperature inside the glove. Difficult to do.

  In the case where the fluorescent lamp is obtained by bending one straight tube bulb into a U shape, the bent portion may be semicircular or U-shaped. Moreover, the bent part may be formed by connecting the vicinity of opposite end portions of two straight pipe valves with a connecting pipe.

  According to the bulb-type fluorescent lamp of claim 1, since the globe formed of a material having an emissivity of 0.8 or more is used, the heat generated by the arc tube accommodated in a substantially sealed state during lighting is efficiently generated. Since it is possible to radiate well outside the globe, it is possible to suppress the temperature inside the globe from becoming high. Therefore, the lighting device is not easily affected by the heat from the fluorescent lamp and can be downsized.

  Since the bulb-type fluorescent lamp according to claim 2 uses a globe that transmits 20% or more of infrared rays having a wavelength of 3 μm or more, the infrared rays emitted from the arc tube during lighting can be efficiently transmitted outside the globe. An increase in internal temperature can be suppressed.

  Since the bulb-type fluorescent lamp according to claim 3 uses a globe having a thermal conductivity of 10 W / m · K or more, it is possible to efficiently conduct heat of the space inside the globe that becomes a high temperature during lighting. Thus, the temperature increase in the globe can be suppressed.

  According to a fourth aspect of the present invention, there can be provided a luminaire provided with a bulb-type fluorescent lamp having the function of the first aspect of the present invention.

  According to the bulb-type fluorescent lamp of claim 1, by forming the globe with a material having a thermal emissivity of 0.8 or more, it is possible to efficiently radiate the heat emitted from the arc tube during lighting to the outside of the globe. Thus, the temperature rise in the globe can be suppressed.

  According to the bulb-type fluorescent lamp of claim 2, it is possible to efficiently transmit infrared rays from the fluorescent lamp outside the globe by forming the globe with a material that transmits 20% or more of infrared rays having a wavelength of 3 μm or more. In addition, it is possible to suppress the temperature rise in the space inside the globe.

  According to the light bulb shaped fluorescent lamp of claim 3, by forming the globe with a material of 10 W / m · K or more, the globe absorbs heat generated from the arc tube during lighting and efficiently conducts heat to the outer wall surface of the globe. By doing, the temperature rise in a glove can be suppressed.

  According to the lighting fixture of Claim 4, the lighting fixture provided with the lightbulb-shaped fluorescent lamp which has an effect | action of the invention as described in any one of Claim 1 thru | or 3 can be provided.

  Hereinafter, an embodiment of a light bulb shaped fluorescent lamp of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional side view of a bulb-type fluorescent lamp.

  In the figure, L is a bulb-type fluorescent lamp, and this bulb-type fluorescent lamp L has a cover body 20 having a base 10, a lighting device 30 accommodated in the cover body 20, a translucent globe 40, A fluorescent lamp 50 housed in the globe 40 is provided. And the envelope comprised from the globe 40 and the cover body 20 is formed in the external shape approximated to the standard dimension equivalent to the small incandescent bulb (mini-krypton type) 40W type, for example. That is, the height including the base 10 is about 81 mm, and the maximum outer diameter of the globe 40 is about 45 mm.

  Hereinafter, the base 10 side will be described as the upper side and the globe 40 side will be described as the lower side.

  The cover body 20 is formed of a heat resistant synthetic resin such as polybutylene terephthalate (PBT). The cover body 20 has a substantially cylindrical shape that expands downward, and has an upper end portion covered with a base 10 such as an E17 shape, and is fixed by an adhesive or caulking.

In addition, the globe 40 is made of milky white having light diffusibility, etc., and is formed into a smooth curved surface having substantially the same shape as a glass bulb of a small incandescent bulb equivalent to a rated power of 40 W, and is formed at the lower end of the cover body 20. An opening edge that is fitted inside the opening is formed. The globe 40 in the present embodiment is made of a BaF ₂ crystal and made of a material that transmits 90% or more of infrared rays from the visible region to a wavelength of about 15 μm.

  Further, the lighting device 30 includes a disk-like circuit board 31 arranged in a horizontal direction, that is, perpendicular to the longitudinal direction of the fluorescent lamp 50, on both surfaces of the circuit board 31, that is, on the upper surface on the base 10 side and on the fluorescent lamp 50 side. A plurality of electronic components 32 are mounted on a certain lower surface to constitute an inverter circuit that performs high-frequency lighting.

  The circuit board 31 is substantially disk-shaped and has a diameter that is 1.2 times or less the maximum width of the fluorescent lamp 50.

  Among the plurality of electronic components 32, an electronic component 32 such as an electrolytic capacitor or a film capacitor having relatively low heat resistance is mounted on the upper surface of the circuit board 31, and the lower surface of the circuit board has relatively high heat resistance. A chip-like electronic component (not shown) having a small thickness is mounted. The components mounted on the lower surface of the circuit board 31 are arranged with a position shifted with respect to the bulb end portion of the fluorescent lamp 50, in particular, the thin tube 51 to be described later, and inside the thin fluorescent tube 50, Amalgam 60 for controlling the mercury vapor pressure is enclosed.

  The lighting device 30 is configured to light 50 fluorescent lamps with a lamp power of 7 to 15 W.

  Further, the fluorescent lamp 50 has three U-shaped bent bulbs 52 having substantially the same shape arranged at predetermined positions and sequentially connected by a communication tube to form one discharge path.

  Each valve 52 is a tube having a substantially cylindrical cross section made of glass having a tube outer diameter of 5 to 10 mm, about 6.5 mm in this embodiment, and a tube inner diameter of 5 mm or more and about 5.2 mm in this embodiment. It is formed in a substantially U shape with a top that is smoothly curved at the middle. That is, each valve 52 includes a bent portion that is smoothly reversed and a pair of parallel straight portions that are continuous with each other. A fluorescent substance is formed on the inner surface of the bulb 52, and the bulb 52 is filled with a rare gas such as argon gas, mercury, or the like.

  The fluorescent lamp 50 is attached to a support plate 21 formed in a disk shape that is a part of a support member that is a fluorescent lamp 50 fixing member and a lighting device 30 fixing member, and the support plate 21 is the lower end of the cover body 20 It is fixed to. The fluorescent lamp 50 is fixed to the support plate 21 by inserting the end portions of the bulbs 52 into a plurality of mounting holes (not shown) formed in the support plate 21 and using an adhesive or the like. Further, these members are fixed to each other by filling the adhesive with the opening edge of the globe 40 fitted between the support plate 21 and the cover body 20. Further, the circuit board 31 of the lighting device 30 is attached to the support plate 21 base 10 side.

  In this manner, the fluorescent lamp 50 is housed in a predetermined position in the globe 40 in a state where it is incorporated. That is, in this state, the tops of the bulbs 52 are located at equal intervals on one circumference centered on a central axis whose longitudinal direction is the vertical direction of the bulb-type fluorescent lamp L. These linear portions are also located at substantially equal intervals on a predetermined circumference centered on the central axis of the fluorescent lamp 50.

  When the bulb-type fluorescent lamp L defined in this way is used for a lighting fixture for a general lighting bulb, the light distribution of the bulb-type fluorescent lamp L approximates the light distribution of the general lighting bulb, so that Even if it is a luminaire projected on the light diffusing cover to the reflector near the socket arranged in the socket, the light distribution of the light bulb-type fluorescent lamp L approximates the light distribution of a general lighting bulb, so that it can be used without a sense of incongruity it can.

  In addition, each valve 52 is sealed at one end by a line seal using a mount or a pinch seal without using a mount, and a thin tube 51 called an exhaust pipe is welded to the other end to exhaust the exhaust. Amalgam 60 is provided to perform or as required.

  A filament coil as an electrode (not shown) is supported by a pair of wells (introduction lines) by a line seal using a mount or the like at the end of each bulb 52 positioned at both ends of the fluorescent lamp 50. Each well is connected to a lamp-side wire led to the outside of the bulb 52 via a jumet wire sealed to the glass at the end of the bulb. Then, two pairs, that is, four lamp-side wires led out from the fluorescent lamp 50 are electrically connected to the lighting device.

  The bulb-type fluorescent lamp L configured in this way has an input power rating of 10 W, and is applied to the fluorescent lamp 50 at a high frequency of 9 W, with a lamp current of 150 mA and a lamp voltage of 60 V. The total luminous flux is 480 lm by use.

  As described above, during the lighting of the bulb-type fluorescent lamp L, the infrared rays emitted from the fluorescent lamp 50 are efficiently transmitted from the globe formed of a material having a high infrared transmittance, so that the temperature inside the globe 40 rises to some extent. Since the infrared rays are sufficiently prevented from being absorbed by the glove of the object, it is possible to efficiently dissipate heat to the outside of the globe.

  FIG. 3 shows the above-described bulb-type fluorescent lamp (a) of the present embodiment, a bulb-type fluorescent lamp (b) in which the fluorescent lamp is covered with a conventional soda lime glass globe, and a bulb-type fluorescent lamp in which the globe is not covered with the fluorescent lamp. (C) was lit on the upper side of the base. It is a graph which shows the experimental result which compared the temperature in the glove | globe at that time, the partition plate temperature which hold | maintains a fluorescent lamp, and the temperature of the electrolytic capacitor accommodated in the cover body. It is the graph which showed the experimental result which measured the average temperature as the same structure except that the material of the glove is the same. In this experiment, it was turned on in an environment with an ambient temperature of 25 ° C., and the temperature was measured.

  As apparent from the graph of FIG. 3, the measured average temperature of the partition plate 31 is 142 ° C. for the bulb-type fluorescent lamp (a) of the present embodiment, and the lamp (b ) Is 155 ° C., the lamp (c) not covered with the globe is 126 ° C., the measured average temperature of the electrolytic capacitor of the lamp (a) is 81 ° C., the lamp (b) is 88 degrees, and the lamp (c) is 83 ° C. Met. Furthermore, the bulb surface temperature during lighting was 200 ° C.

The temperature of the lighting partition plate is about 20 to 30 ° C. lower than that of the lamps (a) and (b) in the lamp (c) having no globe. The average temperature difference on the partition plate of the lamp (a) of the present embodiment and the lamp (b) having the conventional soda lime glass globe is 12 ° C., and the lamp (a) is compared to the lamp without the globe. The result was as high as 10 ° C. This is because BaF ₂ used in the present embodiment has an infrared transmittance of about 85%, and a small amount of infrared rays are absorbed by heat in the globe and a partition plate that does not transmit infrared rays, and by convection in the globe. It seems that the temperature has risen due to the deprived heat. That is, the partition plate that holds the vicinity of the electrode that is the hottest during lighting has a relatively high rate of absorbing the heat of the electrode from the contact portion, and the heat is trapped in the glove and further absorbed by the glove. In addition to being affected by a small amount of infrared rays, convection is generated inside the glove so that it becomes almost a sealed space, and it is assumed that the effect of heat conduction due to this convection is large.

  Further, the temperature of the electrolytic capacitor having a relatively low heat resistance mounted on the base plate side and accommodated in the cover body is not so different from about 10 ° C. as compared with the lamps (b) and (c). This is presumably because the heat generated by the fluorescent lamp is shielded to some extent by the double walls, that is, the partition plate and the circuit board. However, the electrolytic capacitor temperatures of the lamp (a) and the non-globe lamp (c) of the present embodiment, in which the fluorescent lamp is covered with a globe having a high infrared emissivity, have been reduced to an equivalent temperature.

  Thus, since most of the infrared rays emitted from the bulb-type fluorescent lamp L during lighting cover the fluorescent lamp 50 with a material that can be emitted to the outside of the globe 40, the inside of the envelope covered with the inside of the globe 40 and the cover body 20 In addition, the temperature of the support plate 31 and the rise in the cover body 20 are suppressed, so that the support plate 31 made of resin is melted and the electronic component 32 mounted on the lighting device 30 is thermally damaged. Can be suppressed.

  In this way, even if it has a compact structure with an external shape approximating that of a small incandescent bulb equivalent to a rated power of 40 W, the problem due to heat at the time of lighting is eliminated, so it is widely mounted on lighting fixtures using incandescent bulbs. This makes it possible to improve versatility and eliminate the uncomfortable feeling when worn, thus improving the appearance.

  In this embodiment, a bulb-type fluorescent lamp that approximates a small incandescent bulb equivalent to 40 W is adopted, but a bulb-type fluorescent lamp having an envelope that approximates a general incandescent bulb equivalent to 60 W and 100 W is used. The same effect can be expected in the lamp.

  Further, in the present embodiment, the globe 40 made of a material having a high infrared transmittance is adopted, but the globe 40 made of a material capable of suppressing a rise in the desired temperature inside the globe 40 during lighting can be adopted. . For example, a glove that has a heat dissipation area by forming many fine gaps using alumina, silica, boron oxide, or the like as a material, or a glove with good thermal conductivity that contains aluminum nitride, beryllia, silicon oxide, or the like. Can also be adopted. Furthermore, the temperature rise in the bulb-type fluorescent lamp can be further suppressed by adopting a cover body made of a material made of a material equivalent to the globe, such as radiation, infrared transmission, and high thermal conductivity. For example, as shown in FIG. 3, by using the cover body 20 in which the liquid 22 is put in the sealed space of the cover bodies 20a and 20b having a double-structured sealed space, the temperature inside the cover body 20 during lighting is higher than the desired temperature. The liquid 22 injected into the double structure evaporates and takes heat from the inside cover body 20b and conducts it to the outside cover body 20a, thereby cooling and dissipating it, so that the inside of the lit bulb-type fluorescent lamp L The space temperature may be further reduced.

  FIG. 4 is a partially cutaway cross-sectional view showing an embodiment of a lighting fixture of the present invention.

  In the figure, reference numeral 71 denotes a bulb-type fluorescent lamp. Reference numeral 70 denotes an embedded lighting fixture body, and the fixture body 70 includes a base 72, a socket 73 and a reflector 74.

1 is a cross-sectional side view of a light bulb shaped fluorescent lamp according to an embodiment of the present invention. The bulb-type fluorescent lamp (a) of the present embodiment, the bulb-type fluorescent lamp (b) in which the fluorescent lamp is covered with a conventional soda lime glass globe, and the bulb-type fluorescent lamp (c) in which the globe is not covered with the globe The graph which compared the temperature in the glove | globe when it lighted up, the temperature of the partition plate holding a fluorescent lamp, and the temperature of the electrolytic capacitor accommodated in the cover body. The partially notched side view of the bulb-type fluorescent lamp of another embodiment of the present invention. It is a section schematic diagram showing one embodiment of the lighting fixture of the present invention.

Explanation of symbols

10 ... base, 20 ... cover body, 21 ... support plate, 30 ... lighting device,
32 ... electronic parts, 40 ... globe, 50 ... fluorescent lamp, 52 ... bulb

Claims (4)

Arc tube;
A cover body in which a lighting device for lighting the arc tube is housed, the arc tube is supported on one side and a base is mounted on the other side;
A glove having a thermal emissivity of 0.8 or more and covering the arc tube and attached to the cover body;
A bulb-type fluorescent lamp characterized by comprising: Arc tube;
A cover body in which a lighting device for lighting the arc tube is housed, the arc tube is supported on one side and a base is mounted on the other side;
A glove made of a material that transmits 20% or more of infrared rays having a wavelength of 3 μm or more, covering the arc tube and attached to the cover body;
A bulb-type fluorescent lamp characterized by comprising: Arc tube;
A cover body in which a lighting device for lighting the arc tube is housed, the arc tube is supported on one side and a base is mounted on the other side;
A globe having a thermal conductivity of 10 W / m · K or more and attached to the cover body so as to cover the arc tube;
A bulb-type fluorescent lamp characterized by comprising: A bulb-type fluorescent lamp according to any one of claims 1 to 3;
An instrument body equipped with this bulb-type fluorescent lamp;
The lighting fixture characterized by comprising.

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