JP4126527B2 - Light bulb shaped fluorescent lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light bulb-type fluorescent lamp with a thermal countermeasure.
[0002]
[Prior art]
Conventionally, a light bulb-type fluorescent lamp forms a bulb having a bent discharge path by sequentially connecting a plurality of substantially U-shaped tubular bodies as described in, for example, Japanese Patent Application Laid-Open No. 2000-21207. In addition, a circuit equipped with an arc tube with electrodes sealed at both ends of the bulb, and mounted with a lighting circuit that supports the end of each tube body inserted into a resin partition plate and connected to the arc tube The substrate is held on the partition plate, and the circuit board held on the partition plate is accommodated in a resin cover having a base, and the partition plate is attached to the cover.
[0003]
Some of these bulb-type fluorescent lamps have been reduced in size to approximate the standard size of incandescent bulbs and the like with a rated power of 60 W. As the size of the lamps further decreases, the diameter of the bulb of the arc tube has become smaller. The amount of heat generated locally increases, affecting the melting and deterioration of the resin parts such as the partition plate and cover due to the temperature rise of the electrode at the end of life, and reducing the heat radiation area of the cover and There is a concern that the space becomes smaller and the temperature in the cover rises, which may have a thermal effect on the lighting circuit accommodated in the cover.
[0004]
In addition, since the resin partition plate is placed in an environment that is affected by heat and ultraviolet rays from the arc tube, the resin deteriorates and turns brownish brown, resulting in a decrease in light reflectance, and is caused by decomposition of the resin. When the deteriorated material is released in a gaseous state and includes a globe, there is a concern that the deteriorated material adheres to the globe, the light transmittance decreases, and the luminous flux decreases. Furthermore, the resin partition plate may contain, for example, a brominated flame retardant in order to ensure flame retardancy. However, if the amount of this flame retardant added is large, heat from the arc tube and ultraviolet rays There is a concern that a large amount of gas component is released from the flame retardant due to the influence of this, and this gas component affects the lighting circuit and shortens the life of the bulb-type fluorescent lamp. For example, when a gas component enters from an electrolytic capacitor safety valve, the electrolytic capacitor or the like is corroded and damaged, and the driving of the lighting circuit is stopped early.
[0005]
Further, for example, as described in Japanese Utility Model Publication No. 63-14322, a metal partition plate is used, and the heat of the arc tube is efficiently radiated to the outside by the metal partition plate, so that the inside of the arc tube There is a fluorescent lamp device that prevents excessive increase in mercury vapor pressure.
[0006]
In this fluorescent lamp device, unlike the resin partition plate, the circuit board cannot be held on the metal partition plate due to insulation and structure. Therefore, the partition plate and the circuit board cannot be assembled into the cover integrally. First, after the circuit board is mounted in the cover at a position insulated from the partition plate, the partition plate needs to be attached and screwed, and the circuit board and the partition plate need to be individually assembled to the cover.
[0007]
[Problems to be solved by the invention]
As mentioned above, along with the further miniaturization of bulb-type fluorescent lamps, the heat generation amount increases due to the diameter of the bulb of the arc tube, and the resin part such as the partition plate and cover melts due to the temperature rise of the electrode at the end of the life. There is a problem in that the heat dissipation area of the cover is reduced, the space in the cover is reduced, the space in the cover is reduced, the temperature in the cover is increased, and the lighting circuit accommodated in the cover is thermally affected.
[0008]
In addition, the resin partition plate is placed in an environment affected by heat and ultraviolet rays from the arc tube, so the resin deteriorates and turns brown and the light reflectance decreases or is emitted in the form of gas. There is a problem that the luminous flux decreases, for example, the light transmittance of the globe decreases due to adhesion of deteriorated materials, and if the resin partition plate contains a large amount of flame retardant, heat from the arc tube or ultraviolet rays There is a problem that the gas component released from the flame retardant affects the lighting circuit due to the influence of the above.
[0009]
In addition, the heat dissipation of the arc tube can be improved by using a metal partition plate, but the circuit board cannot be held on the metal partition plate, so it is necessary to assemble the circuit board and the partition plate individually on the cover. There is a problem that the assemblability is impaired.
[0010]
The present invention has been made in view of these points, and is easy to assemble, can reduce the thermal influence on the resin portion and the lighting circuit, etc., and has a reduced luminous flux and lighting as in the case where the partition plate is made of resin. An object of the present invention is to provide a bulb-type fluorescent lamp capable of preventing influence on a circuit.
[0011]
[Means for Solving the Problems]
A light bulb shaped fluorescent lamp according to claim 1; an arc tube; a lighting circuit for lighting the arc tube; A connection surface is provided at the periphery A metal partition plate disposed on the arc tube side and a resin holder disposed on the non-arc tube side are integrally formed to support the arc tube inserted through the partition plate and at least the lighting circuit in the holder A partition holding a part; and a cover containing a lighting circuit attached to the partition and held by a holding portion of the partition; A metal heat dissipating portion provided with a connection surface provided on the outer surface of the cover and contacting the connection surface of the partition plate when the partition is attached to the cover; And a base attached to the cover.
[0012]
And in this structure, since the partition which integrally formed the metal partition plate arrange | positioned at the arc_tube | light_emitting_tube side and the resin holding part arrange | positioned at the non-light-emitting tube side is used, the partition plate side of this partition The arc tube and the lighting circuit are integrally attached to the holding part and assembled to the cover. Moreover, the metal partition plate arranged on the arc tube side reduces the thermal effect on the resin part and lighting circuit due to the temperature rise of the arc tube, and covers from the metal partition plate with high thermal conductivity. The heat is efficiently transmitted to the side, the heat transmitted from the partition to the lighting circuit is suppressed, and the temperature rise of the lighting circuit is reduced. Furthermore, since the partition plate is made of metal, it is not affected by heat from the arc tube or ultraviolet rays as in the case of resin, and the light flux reduction and the influence on the lighting circuit are prevented.
[0013]
further Since the metal heat dissipating part connected to the partition plate is provided on the outer surface of the cover, the heat dissipating property of the heat transmitted from the partition plate to the heat dissipating part is improved.
[0014]
Contract Claim 2 The light bulb shaped fluorescent lamp described in claim 1 In the described bulb-type fluorescent lamp, either the coating or the surface treatment is applied to the surface of the heat dissipating part.
[0015]
And in this structure, since any one of coating and surface treatment processing was given to the surface of the thermal radiation part, the thermal radiation property from a thermal radiation part improves.
[0016]
Contract Claim 3 The light bulb shaped fluorescent lamp described in claim 1. Or 2 In the described bulb-type fluorescent lamp, a heat absorption layer is formed on the inner surface of the cover.
[0017]
In this configuration, since the heat absorption layer is formed on the inner surface of the cover, the heat in the cover is efficiently absorbed and radiated from the cover to the outside, and the temperature rise in the cover is reduced.
[0018]
Claim 4 The light bulb-type fluorescent lamp according to any one of claims 1 to 3 In any one of the bulb-type fluorescent lamps described above, a translucent glove that covers the arc tube is attached to the cover, and the ratio of the input power to the surface area where the cover excluding the glove and the base is exposed to the outside is 700W / m ² That's it.
[0019]
In this configuration, the ratio of the input power to the surface area where the cover excluding the globe and the base is exposed to the outside is 700 W / m. ² Therefore, the bulb-type fluorescent lamp can be reduced in size, and even if it is reduced in size, the influence on the resin portion and the lighting circuit from the arc tube is reduced.
[0020]
Claim 5 The light bulb-type fluorescent lamp according to any one of claims 1 to 4 In any one of the light bulb shaped fluorescent lamps, the ratio of the input power of the arc tube to the volume of the arc tube is 300 kW / m. ^Three That's it.
[0021]
In this configuration, the ratio of the input power of the arc tube to the volume of the arc tube is 300 kW / m. ^Three For this reason, the bulb-type fluorescent lamp is downsized, and even if it is downsized, the influence on the resin portion from the arc tube and the lighting circuit is reduced.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 to FIG. 8 show a first embodiment, FIG. 1 is a cross-sectional view of a bulb-type fluorescent lamp, FIG. 2 is a front view of a bulb-type fluorescent lamp through a globe, and FIG. FIG. 4 is a development view of an arc tube of a bulb-type fluorescent lamp, FIG. 4 is a plan view of a circuit board of the bulb-type fluorescent lamp, FIG. 5 is a schematic diagram showing a heat flow of the bulb-type fluorescent lamp, and FIG. Input power to the bulb-type fluorescent lamp for Experiment A in which the partition of the bulb-type fluorescent lamp is formed of only polybutylene terephthalate (PBT) resin and in Example B in which the partition is integrally formed with a metal partition plate FIG. 7 is a graph showing the experimental results of measuring the average temperature of the lighting circuit when changing the temperature, and FIG. 7 shows the thermal emissivity when the heat absorption layer is not formed on the inner surface of the cover of the bulb-type fluorescent lamp as 0.08, Heat when a heat absorption layer is formed on the inner surface of the cover FIG. 8 is a graph showing a calculation result of calculating the heat flow rate at the lower side and the upper side of the cover when the emissivity is 0.8, and FIG. 8 is an experimental example C in which no heat absorption layer is formed on the inner surface of the cover of the bulb-type fluorescent lamp. And (a) a graph showing experimental results of measuring the temperature of the main amalgam portion when the input power to the bulb-type fluorescent lamp is changed. It is a graph which shows the experimental result which measured the temperature of the part of the capacitor | condenser which is one of the circuit components of the lighting circuit at the time of changing the input electric power to a lightbulb-type fluorescent lamp.
[0024]
1 and 2, reference numeral 11 denotes a bulb-type fluorescent lamp. The bulb-type fluorescent lamp 11 is attached to an envelope having a cover 12, a base 13 and a globe 14, and a partition 15 to be housed in the envelope. And a fluorescent lamp device having a light emitting tube 16 and a lighting circuit 17. The envelope is, for example, an external shape approximating the standard size of a mini-krypton type bulb, the height dimension from the base 13 to the globe 14 is about 81 mm, and the width corresponding to the maximum diameter portion of the globe 14 The direction dimension is about 45 mm. In the following description, one end side of the cover 12, that is, the base 13 side is set as the upper side, and the other end side, that is, the globe 14 and the arc tube 16 side is set as the lower side.
[0025]
The cover 12 is formed in a substantially cylindrical shape that expands downward on the arc tube 16 side with a white heat-resistant synthetic resin such as polybutylene terephthalate (PBT).
[0026]
On the outer peripheral surface of the cover 12 on the arc tube 16 side, a metal heat radiating portion 21 is formed by integral molding. The heat dissipating part 21 is formed in an annular shape with a metal material such as aluminum having a higher thermal conductivity than the material of the cover 12, and the end on the arc tube 16 side protrudes from the cover 12 to be approximately 45 °. A connecting surface 22 chamfered in a slanted shape is formed.
[0027]
When the material is aluminum, the surface of the heat dissipating part 21 has a low thermal emissivity of 0.1 or less. Therefore, for the purpose of improving the thermal emissivity, a white acrylic paint with higher thermal emissivity than aluminum is applied. Or a surface treatment process such as white alumite treatment is applied to form the heat radiation layer 23.
[0028]
A heat absorbing layer 24 is formed on the inner surface of the cover 12 by applying a heat absorbing paint such as lacquer black. The heat emissivity of the heat absorption layer 24 is 0.8 or more.
[0029]
The base 13 is an Edison type E17 type or the like, and is placed on the upper end portion of the cover 12 after wiring with the lighting circuit 17 and fixed by an adhesive or caulking.
[0030]
The globe 14 is made of a transparent or light-diffusing milky white or the like, 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. The edge of the opening is fitted to the cover 12 and adhered by an adhesive. The globe 14 can be combined with another member such as a diffusion film to improve luminance uniformity, or the globe 14 itself can be omitted.
[0031]
The partition 15 is attached to the opening at the lower end of the cover 12, and is made of a metal partition plate 26 disposed on the arc tube 16 side and the side opposite to the arc tube 16 side, that is, the non-arc tube side. And a resin-made holding portion 27 disposed integrally with each other.
[0032]
The partition plate 26 is formed in a disk shape having a plate thickness of 0.3 to 2 mm with a metal material such as aluminum having a higher thermal conductivity than the material of the cover 12. A plurality of mounting holes 28 (see FIG. 11) through which the arc tube 16 is inserted are formed on the inner side of the partition plate 26, and the peripheral portion of the partition plate 26 protrudes to the outer diameter side from the holding portion 27 so as to be approximately 45 °. An inclined connection surface 29 is formed. This connection surface 29 is connected to the connection surface 22 of the heat radiating portion 21 in surface contact with each other with the partition 15 attached to the cover 12, and is directly contacted and fixed by welding or thermal conductivity. Is bonded and fixed with a silicone resin or the like of about 1 to 10 W / mK (watts per meter kelvin). If the thickness of the partition plate 26 is less than 0.3 mm, the strength is low, and if it exceeds 2 mm, the arc tube 16 and the cover 12 are damaged in a drop test in a packaged state.
[0033]
The holding portion 27 is formed by integral molding with the partition plate 26 using a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT), and includes an arc tube holding portion 30 that holds the arc tube 16 and a lighting circuit 17. A lighting circuit holding unit 31 for holding is formed. A plurality of mounting holes 32 through which the arc tube 16 is inserted are formed in the arc tube holding part 30, and the arc tube 16 is inserted into the mounting holes 32 and fixed with an adhesive 33 such as silicone resin, for example. Is done. The lighting circuit holding unit 31 has a plurality of circuit board holding claws 34 that protrude from the peripheral edge position of the arc tube holding unit 30 and hold the lighting circuit 17.
[0034]
The arc tube 16 has a glass bulb 37 as shown in FIGS. 1 to 3, for example, a three-wavelength phosphor is formed on the inner surface of the bulb 37, and argon or the like is formed inside the bulb 37. A sealed gas containing a rare gas, mercury or the like is sealed, and a pair of electrodes 38 are sealed at both ends of the valve 37 by, for example, pinch seals.
[0035]
The valve 37 has three pipe bodies 39 in the present embodiment, and these pipe bodies 39 have, for example, a pipe outer diameter of 5 to 10 mm, and in this embodiment, about 6.5 mm, and a pipe inner diameter of 5 mm. As described above, in the present embodiment, a tube having a substantially cylindrical cross section made of glass having a size of about 5.2 mm is formed in a substantially U shape having a top portion that is curved at the intermediate portion. That is, each tubular body 39 includes a bent portion 40 that is curved, and a pair of straight pipe portions 41 that are parallel to each other and that are continuous with the bent portion 40. The bent portion 40 and the end portion are substantially U-shaped. The maximum tube length in the height direction is about 35 mm. The tube length in the height direction is formed such that the central tube 39 is slightly longer than the tubes 39 on both sides.
[0036]
Adjacent end portions of each tube 39 are sequentially connected by a communication tube 42 to form one continuous discharge path 43 having a discharge path length of 120 to 200 mm. The communication pipe 42 is formed by joining openings formed by blowing and tearing end portions to which the respective tube bodies 39 are connected to each other. The straight tube portions 41 of the respective tube bodies 39 are positioned at equal intervals on the same circumference centered on the central axis of the bulb-type fluorescent lamp 11, that is, the straight tube portions 41 of the respective tube bodies 39 have six cross sections. It is arranged corresponding to each vertex of the square.
[0037]
Each tube 39 is sealed at one end with a line seal using a mount or a pinch seal without using a mount, and a cylindrical narrow tube 44 called an exhaust pipe is in communication with the other end. Projected. In this embodiment, the narrow tubes 44 of the tube body 39 at both ends of the valve 37 are provided so as to protrude from the end opposite to the end where the electrode 38 is sealed, that is, the end on the non-electrode side. Each of these thin tubes 44 is sequentially sealed by fusing in the manufacturing process of the valve 37, and the inside of the valve 37 is exhausted through an unsealed part of each thin tube 44, and the enclosed gas is enclosed and replaced. Then, sealing is performed by fusing an unsealed part of each of the capillaries 44.
[0038]
Each electrode 38 has a filament coil 45, and the filament coil 45 is supported by a pair (two) of linear wells 46. Each well 46 is, for example, led to the outside of the end portion of the tube body 39 at both ends via a jumet wire sealed to the end portion of the tube body 39 at both ends by a pinch seal or the like and connected to the lighting circuit 17. Connected to the wire 47.
[0039]
The main amalgam 48 is enclosed in the narrow tube 44 of the tube 39 at one end when the thin tube 44 is sealed. The main amalgam 48 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 37 within an appropriate range. In addition, as the main amalgam 48, what was formed with the alloy which combined tin, lead, etc. other than bismuth and indium may be used. Further, an auxiliary amalgam 49 having mercury vapor pressure characteristics similar to that of the main amalgam 48 is attached to one well 46 of the electrode 38 of each tubular body 39 at both ends.
[0040]
Then, the end of each tubular body 39 of the valve 37 is inserted into the mounting hole 28 of the partition plate 26 of the partition 15 and the mounting hole 32 of the holding part 27, and an adhesive such as silicone resin is attached from the inside of the holding part 28. By filling the agent, the end of each tube 39 and the partition 15 are fixed to each other.
[0041]
Further, as shown in FIG. 1, the lighting circuit 17 includes a substantially disk-shaped circuit board 51 that is held by the partition 15 and disposed in the cover 12, A plurality of electrical components 52 are mounted on both the base 13 side and the arc tube 16 side to constitute an inverter circuit which is a high-frequency lighting circuit for lighting the arc tube 16 at high frequency.
[0042]
When mounting electrical components on both sides of the circuit board 51, on the base 13 side, electrical components 52 such as large electrolytic capacitors and film capacitors, which are relatively weak against heat, that is, relatively low in heat resistance, are arranged. On the arc tube 16 side, a chip-like electric component 52 which is a chip component such as a REC, transistor, resistor or the like such as a rectifier, diode bridge or the like having a relatively high resistance to heat, that is, relatively high heat resistance and a small height. Is placed.
[0043]
As shown in FIG. 4, the circuit board 51 is formed with a plurality of through holes 53 through which the thin tubes 44 of the arc tube 16 are inserted, and the main amalgam 48 among the through holes 53 is formed on the upper surface side of the circuit board 51. A plurality of switching elements 54 such as a field effect transistor (FET) are arranged on the side of the through hole 53 through which the accommodated thin tube 44 is inserted. That is, since the main amalgam 48 and the plurality of switching elements 54 in the narrow tube 44 are arranged close to each other, when the bulb-type fluorescent lamp 11 is started, the switching element 54 is likely to generate heat relatively quickly among circuit components. The main amalgam 48 is quickly heated by heat, the mercury vapor pressure in the arc tube 16 is quickly increased, and the rising characteristics of the luminous flux can be improved.
[0044]
The bulb-type fluorescent lamp 11 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. At this time, the ratio of the input power to the surface area where the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 is exposed to the outside is 700 W / m. ² In addition, the ratio of the input power of the arc tube 16 to the volume of the arc tube 16 is 300 kW / m. ^Three That's it. The tube wall load of the arc tube 16 is 0.1 W / cm. ² As described above, the arc tube 16 having a high tube wall load becomes considerably high temperature during lighting and the UV output becomes strong. Therefore, the thermal influence on the partition 15 or the influence of ultraviolet irradiation is large.
[0045]
FIG. 5 schematically shows the heat flow of the bulb-type fluorescent lamp 11.
[0046]
The heat generated in the arc tube 16 has a path transmitted to the globe 14 by convection and radiation of air in the globe 14, a path transmitted to the partition 15, and a path transmitted to the circuit board 51 through the wire 47 of the arc tube 16. .
[0047]
The inflow of heat to the lighting circuit 17 includes heat transmitted to the circuit board 51 through the wire 47 of the arc tube 16 and heat transmitted from the partition 15.
[0048]
The heat that flows into the lighting circuit 17 and the heat that the lighting circuit 17 self-heats include a path that is transmitted to the cover 12 by convection and radiation of air in the cover 12 and a path that is transmitted to the lighting fixture through the base 13.
[0049]
The inflow of heat into the cover 12 is caused by heat transmitted from the globe 14, heat transmitted by air convection from the partition 15, the circuit board 51 and the base 13, heat transmitted from the partition 15, and radiation from the lighting circuit 17. There is a transmitted heat.
[0050]
In order to suppress the temperature rise of the lighting circuit 17, it is important to reduce the amount of heat transmitted from the partition body 15.
[0051]
FIG. 6 shows the experimental results of measuring the average temperature of the lighting circuit 17 when the input power is changed while the bulb-type fluorescent lamp 11 is lit. In the experiment, the power supply voltage was varied between Experimental Example A in which the partition 15 was formed only of polybutylene terephthalate (PBT) resin and Experimental Example B in which the partition 15 was integrally formed with an aluminum metal partition plate 26. To change the input power. The ambient temperature is 25 ° C., and the temperature measurement is a simple average value obtained by measuring eight locations of two switching elements, ballast, REC, preheating capacitor, DC cut capacitor, gate resonance inductor, and smoothing electrolytic capacitor. The thermal conductivity of polybutylene terephthalate (PBT) is 0.3 W / mK, and the thermal conductivity of aluminum is 298 W / mK.
[0052]
As a result of the experiment, the experimental example B in which the metal partition plate 26 is integrally formed with the partition 15 has an average temperature reduced by about 5 ° C. compared to the experiment example A using only the resin that does not use the metal partition plate 26. .
[0053]
This is because when the metal partition plate 26 is used, the heat conductivity of the partition plate 26 is high, so that the amount of heat transferred from the partition plate 26 to the cover 12 increases as shown in FIG. The amount of heat transferred from the plate 26 to the lighting circuit 17 is reduced, and an excessive temperature rise in the lighting circuit 17 can be reduced. In other words, the heat of the arc tube 16 can be blocked by the partition plate 26, and an excessive temperature rise of the lighting circuit 17 can be reduced.
[0054]
Furthermore, by providing the metal heat dissipating part 21 in contact with the partition plate 26 on the cover 12 side, the heat transmitted from the partition plate 26 to the heat dissipating part 21 can be efficiently released to the outside. From the heat radiating portion 21, there are heat taken away by convection with outside air and heat taken away by thermal radiation.
[0055]
In the bulb-type fluorescent lamp 11, since the temperature of the cover 12 rises to nearly 80 ° C., the heat radiation from the heat radiating portion 21 is effective, but the heat emissivity of a metal such as aluminum is as low as 0.1 or less, If the metal surface of the heat dissipating part 21 is exposed, sufficient heat radiation cannot be obtained. Therefore, the surface of the heat radiating part 21 is coated with a white acrylic paint whose thermal emissivity is higher than that of aluminum, or a surface treatment process such as white alumite treatment is applied to form the heat radiation layer 23, thereby providing heat radiation. Can be improved. Moreover, by setting the heat dissipating part 21 to white, when the bulb-type fluorescent lamp 11 is turned on in the lighting fixture, the light reflectance is high, the appliance efficiency can be improved, and the appearance can also be improved.
[0056]
By providing the heat dissipating part 21 only on a part of the resin cover 12 on the arc tube 16 side, the heat transmitted from the partition plate 26 is efficiently dissipated in the heat dissipating part 21, and the resin cover 12 is dissipated from the heat dissipating part 21. The heat transmitted to this part is reduced, the temperature of the cover 12 is lowered, the heat in the cover 12 can easily escape to the outside through the cover 12, and the temperature rise of the lighting circuit 17 can be reduced.
[0057]
Thus, according to the bulb-type fluorescent lamp 11, the metal partition plate 26 arranged on the arc tube 16 side and the resin holder arranged on the non-luminous tube side opposite to the arc tube 16 side Since the partition body 15 integrally formed with the portion 27 is used, the arc tube 16 can be attached to the partition plate 26 side of the partition body 15, and the lighting circuit 17 can be integrally mounted to the holding portion 27 side to be assembled to the cover 12. .
[0058]
In addition, the metal partition plate 26 disposed on the arc tube 16 side prevents melting and deterioration of the resin portion such as the holding portion 27 of the partition 15 and the cover 12 due to the temperature rise of the electrode 38 at the end of the lifetime. Thus, it is possible to reduce the thermal influence on the resin portion and the lighting circuit 17 due to the temperature rise of the arc tube 16. Furthermore, heat can be efficiently transferred from the metal partition plate 26 with high thermal conductivity to the cover 12 side, and heat transmitted from the partition 15 to the lighting circuit 17 is suppressed, and excessive lighting that affects the lighting characteristics of the lighting circuit 17 Temperature rise can be reduced.
[0059]
Further, since the partition plate 26 is made of metal, there is no influence of deterioration from heat or ultraviolet rays from the arc tube 16 as in the case of resin, and it is possible to prevent a decrease in luminous flux and an influence on the lighting circuit 17. That is, as in the case of the resin, the partition plate 26 turns brown and the light reflectance is reduced, or a deteriorated resin adheres to the globe 14 and the light transmittance is reduced. The influence of the gas component released from the contained flame retardant on the electrical components of the lighting circuit 17 can be reliably prevented.
[0060]
Therefore, the ratio of the input power to the surface area where the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 is exposed to the outside is 700 W / m. ² In addition, the ratio of the input power of the arc tube 16 to the volume of the arc tube 16 is 300 kW / m. ^Three By using the arc tube 16 as described above, the bulb-type fluorescent lamp 11 can be reduced in size, and the influence on the resin portion and the lighting circuit 17 from the arc tube 16 can be reduced.
[0061]
Further, since the inside of the cover 12 is a sealed space, the lighting circuit 17 accommodated in the cover 12 excessively increases in temperature and affects the lighting characteristics, or the arc tube 16 positioned in the cover 12 The main amalgam 48 is excessively heated, and the mercury vapor pressure cannot be maintained properly. Therefore, in order to reduce the temperature in the cover 12, for example, a lacquer-based black paint is applied to the inner surface of the cover 12 to form the heat absorption layer 24. The heat emissivity of the heat absorption layer 24 is 0.8 or more.
[0062]
As shown in FIG. 5, the cover 12 has heat transferred by radiation from the partition 15 and the lighting circuit 17 and heat transferred by convection of air in the cover 12 from the partition 15 and the lighting circuit 17.
[0063]
In FIG. 7, the heat emissivity when the heat absorption layer 24 is not formed on the inner surface of the cover 12 is 0.08, and the heat emissivity when the heat absorption layer 24 is formed on the inner surface of the cover 12 is 0.8. As a result, the calculation result of calculating the heat flow rate at the lower side and the upper side of the cover 12 is shown. By increasing the thermal emissivity, the heat flow rate of the cover 12 increased by 0.96-0.76 = 0.2 W on the lower side and 0.84-0.75 = 0.09 W on the upper side. Along with the increase in the heat flow rate of the cover 12, when the average temperature of the lighting circuit 17 is 111.5 ° C., for example, a calculation result is obtained that is reduced to 105.4 ° C.
[0064]
FIG. 8A shows an experimental example C in which the heat absorbing layer 24 is not formed on the inner surface of the cover 12 and an experimental example D in which the heat absorbing layer 24 is formed on the inner surface of the cover 12. The experimental result which measured the temperature of the part of the main amalgam 48 at the time of changing input electric power is shown. FIG. 8B shows an experimental example C in which the heat absorption layer 24 is not formed on the inner surface of the cover 12 and an experimental example D in which the heat absorption layer 24 is formed on the inner surface of the cover 12. The experimental result which measured the temperature of the part of the capacitor | condenser which is one of the circuit components of the lighting circuit 17 at the time of changing the input electric power to is shown.
[0065]
As a result of the experiment, the temperature of Experiment Example D in which the heat absorption layer 24 was formed on the inner surface of the cover 12 was lower than that of Experiment Example C in which the heat absorption layer 24 was not formed on the inner surface of the cover 12.
[0066]
This is because when the heat absorption layer 24 is formed on the inner surface of the cover 12, the heat transmitted to the cover 12 by the convection of the air in the cover 12 is applied to the heat absorption layer 24 to which the black paint is applied, as shown in FIG. This is because the heat is absorbed efficiently by the cover 12 and is radiated to the outside air through the cover 12. Thereby, an excessive temperature rise in the cover 12 can be reduced, an excessive temperature rise in the lighting circuit 17 and the main amalgam 48 can be reduced, the lighting circuit 17 can be protected, and the mercury vapor pressure can be kept appropriate.
[0067]
Next, FIG. 9 to FIG. 11 show a second embodiment. FIG. 9 is a sectional view of a bulb-type fluorescent lamp, FIG. 10 is an enlarged sectional view of a partition of the bulb-type fluorescent lamp, and FIG. It is a bottom view of the partition of a lamp. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0068]
The partition 15 includes a metal partition plate 26 disposed at least in the center of the surface facing the arc tube 16, and a resin holder 27 that is disposed around the partition plate 26 and holds the lighting circuit 17. Are integrally formed by, for example, insert molding or snapshot. The metal partition plate 26 may also serve as a member that supports the arc tube 16, and the arc tube 16 may be supported exclusively by a resin holding portion 27.
[0069]
The partition plate 26 is formed in a disk shape having a plate thickness of 0.3 to 2 mm with a metal material such as aluminum having a higher thermal conductivity than the material of the cover 12. A pair of mounting holes 28 having a substantially U-shape through which the straight pipe portions 41 of the pair of tube bodies 39 of the arc tube 16 are inserted are formed. With the straight tube portions 41 of each pair of tube bodies 39 of the arc tube 16 inserted through the pair of mounting holes 32, an adhesive such as silicone resin is bonded between the upper surface side of the partition plate 26 and the arc tube 16 Agent 33 is filled and fixed. If the thickness of the partition plate 26 is less than 0.3 mm, the strength is low, and if it exceeds 2 mm, the arc tube 16 and the cover 12 are damaged in a drop test in a packaged state.
[0070]
The holding portion 27 is formed of a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT), for example, and has an annular divider plate holding ring 61 disposed around the divider plate 26. A fitting groove 62 in which the peripheral edge of the partition plate 26 is tightly fitted is formed on the inner circumference of the ring 61. An annular cover mounting portion 63 that protrudes from the outer peripheral surface of the partition plate holding ring 61 and is attached to the cover 12 is formed at the upper end of the partition plate holding ring 61, and protrudes from the inner surface of the cover 12 on the outer periphery of the cover mounting portion 63. A locking groove 64 for locking to a locking projection (not shown) is formed. A plurality of circuit board holding claws 65 for holding the circuit board 51 of the lighting circuit 17 are formed on the inner peripheral part of the cover mounting part 63 at the upper end of the partition plate holding ring 61.
[0071]
Further, the arc tube 16 has a relationship that the height H1 of the central tube 39 is 35 to 40 mm, the height H2 of the tubes 39 on both sides is 35 to 40 mm, and H1> H2. The height H1 of the central tube 39 and the height H2 of the tubes 39 on both sides mean the length from the valve sealing end to the top of the bent portion 40.
[0072]
An arc tube 16 in which three tube bodies 39 having a tube outer diameter d of 5 to 10 mm are juxtaposed so that their U-shaped surfaces face each other is connected in the bulb juxtaposition direction of the central tube body 39. The width dimension a in the direction intersecting the line is 30 to 35 mm, the width dimension in the bulb juxtaposition direction of the arc tube 17 is b, and the width dimension in the direction intersecting the bulb juxtaposition direction of the tube bodies 39 on both sides is c. Then, 0.9a ≧ b ≧ 0.75a 0.9a ≧ c ≧ 0.75a.
[0073]
For example, the width a of the central tube 39 is about 32 mm, the width c of the tubes 39 on both sides is about 26 mm, and the width b of the arc tube 16 is about 26 mm. Corresponding to these width dimensions, the tube length in the height direction between the bent portion 40 of the central tube body 39 and the end portion of each straight tube portion 41 is about 37 mm, the bent portions 40 of the tube bodies 39 on both sides and the straight lines. The tube length in the height direction from the end of the portion 41 is formed to be about 34 mm.
[0074]
When b exceeds 0.9a, the width of the arc tube 16 in the diagonal direction becomes large, which is not suitable for miniaturization. If b is less than 0.75a, the light distribution in the rotation direction of the arc tube 16 becomes non-uniform, which is not preferable. When c exceeds 0.9a, the width of the arc tube 16 in the diagonal direction becomes large, which is not suitable for miniaturization. If c is less than 0.75a, the discharge path length of the arc tube 16 is shortened and lamp efficiency is lowered.
[0075]
In this way, the tubes 39 approach each other by the regulation of the width dimension b in the bulb side-by-side direction of the arc tube 16, and further, due to the approach of each tube 39, the both sides of the arc tube 16 are limited in size. The length c of the tube body 39 can be increased to ensure the discharge path length, and the distance from the globe 14 is increased, and the height direction of the tube body 39 is increased accordingly and the discharge path length can be increased. Therefore, the discharge path length of the arc tube 16 can be secured and the luminous efficiency can be improved while reducing the size of the arc tube 16 within the dimensional constraints.
[0076]
The arc tube 16 has a central tube 39 having a height H1 of 35 to 40 mm, both tubes 39 having a height H2 of 35 to 40 mm, and H1> H2, and a discharge path length of 120 to 200 mm. The total luminous flux when the lamp is lit at 7 to 12 W is 450 lm or more, and the lamp efficiency is 45 lm / W or more. At this time, the ratio of the input power to the surface area where the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 is exposed to the outside is 700 W / m. ² In addition, the ratio of the input power of the arc tube 16 to the volume of the arc tube 16 is 300 kW / m. ^Three That's it. The bulb-type fluorescent lamp 11 using the arc tube 16 has a light output equivalent to that of a small incandescent bulb, and can be a light source having substantially the same size.
[0077]
Experiments have confirmed that the discharge path length is required to be 120 mm or more in order to obtain a light output substantially equivalent to that of a small incandescent bulb. That is, if the discharge path length is less than 120 mm, a desired light output cannot be obtained, and the ratio of the electrode loss portion that does not contribute to light emission to the discharge path length increases, so that the desired lamp efficiency cannot be obtained. . Therefore, the discharge path length needs to be 120 mm or more. However, if the discharge path length exceeds 200 mm, the lamp starting voltage becomes excessively high, and it is difficult to generate a sufficient starting voltage in a small inverter circuit accommodated in the external dimensions substantially the same as a small incandescent bulb. Therefore, the discharge path length is 120 to 200 mm.
[0078]
In order to accommodate the arc tube 16 within the outer dimensions substantially the same as a small incandescent bulb, the luminous bulb 16 must have a maximum width of 45 mm or less, preferably 40 mm or less, and the height is also limited to 40 mm or less. Under these conditions, in order to obtain the arc tube 16 having a discharge path length of 120 to 200 mm, a lighting test was performed with various bulbs having different tube diameters. As a result, the outer diameter of the tube was 5 to 10 mm and the height was 35 to 40 mm. It has been confirmed by experiments that sufficient light output and lamp efficiency can be obtained if the arc tube 16 is configured by combining the central tube body 39.
[0079]
The arc tube 16 has a tube outer diameter limited to 10 mm or less in order to make the discharge path length 120 mm or more, but by making the tube outer diameter 10 mm or less, the lamp current is suppressed as much as possible to increase the lamp voltage, It became possible to increase the lighting circuit efficiency. That is, as the lamp current increases, the heat loss in the lighting circuit 17 increases, and this tendency becomes more prominent as the power consumption decreases. Therefore, the discharge path length is 120 to 200 mm in an arc tube with a lamp power of 12 W or less. The diameter is desirably 10 mm or less. If the outer diameter of the tube is less than 5 mm, the starting voltage increases, the lamp efficiency decreases, and the arc tube 16 is complicated to manufacture.
[0080]
Accordingly, the central tube 39 has a tube outer diameter of 5 to 10 mm and a maximum height of 35 to 40 mm. Considering the manufacturing process and arc tube efficiency, it may be preferable that the maximum height of the central tube 39 is 30 to 55 mm. However, if the manufacturing process and arc tube efficiency are not affected, the height is set to 35 to 55 mm. It is desirable to be within the range of 40 mm.
[0081]
If the height H1 of the central tube 39 exceeds 40 mm, it is difficult to achieve the same dimensions as a small incandescent bulb, and if it is less than 35 mm, it is difficult to ensure a desired discharge path length.
[0082]
If the height H2 of the tube 39 on both sides exceeds 36 mm, the step between the adjacent bent portion tops similar to the shape of the bent portion 40 of the central tube 39 cannot be realized, and the rotational symmetry of the arc tube 16 is reduced. When it is less than 30 mm, it is difficult to secure a desired discharge path length.
[0083]
Then, according to the bulb-type fluorescent lamp 11 configured as described above, the metal partition plate 26 disposed at least in the center portion of the surface facing the arc tube 16 and the periphery of the partition plate 26 are disposed. In order to use the partition 15 having the resin holding portion 27, the arc tube 16 is attached to the partition plate 26 of the partition 15 and the lighting circuit 17 is integrally attached to the holding portion 27. The cover 12 can be easily assembled.
[0084]
In addition, the metal partition plate 26 facing the arc tube 16 can reduce the thermal influence on the resin portion and the lighting circuit 17 due to the temperature rise of the arc tube 16, and the metal partition plate 26 with high thermal conductivity. Thus, heat can be efficiently transferred to the cover 12 side, heat transmitted from the partition 15 to the lighting circuit 17 can be suppressed, and an increase in temperature of the lighting circuit 17 can be reduced. In particular, the end of the arc tube 16 inserted through the mounting hole 28 of the partition plate 26 is bonded and fixed to the partition plate 26 with an adhesive 33 such as silicone resin. It is possible to efficiently transmit to the made partition plate 26, and to reduce the thermal influence on the lighting circuit 17.
[0085]
Further, since the partition plate 26 is made of metal, there is no influence of deterioration from heat or ultraviolet rays from the arc tube 16 as in the case of resin, and it is possible to prevent a decrease in luminous flux and an influence on the lighting circuit 17. That is, as in the case of the resin, the partition plate 26 turns brown and the light reflectance is reduced, or a deteriorated resin adheres to the globe 14 and the light transmittance is reduced. The influence of the gas component released from the contained flame retardant on the electrical components of the lighting circuit 17 can be reliably prevented.
[0086]
Therefore, the ratio of the input power to the surface area where the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 is exposed to the outside is 700 W / m. ² In addition, the ratio of the input power of the arc tube 16 to the volume of the arc tube 16 is 300 kW / m. ^Three As described above, the bulb-type fluorescent lamp 11 can be reduced in size, and the influence on the resin portion from the arc tube 16 and the lighting circuit 17 can be reduced.
[0087]
Next, FIG. 12 shows a third embodiment, and FIG. 12 is a partial cross-sectional view of a bulb-type fluorescent lamp. In addition, about the same structure as each said embodiment, the description is abbreviate | omitted using the same code | symbol.
[0088]
The cover 12 is formed of a metal material such as aluminum. The outer surface of the cover 12 may be coated with a white acrylic paint having a high thermal emissivity, or may be subjected to a surface treatment such as a white alumite treatment to form a heat radiation layer.
[0089]
An insulator 71 made of a heat-resistant synthetic resin material having insulation properties such as polybutylene terephthalate (PBT) is integrally incorporated inside the cover 12. The insulator 71 includes a base mounting portion 72 that protrudes from the upper end of the cover 12 to which the base 13 is attached, a cover portion 73 that is disposed in contact with the inner surface of the cover 12, and a circuit board that protrudes from the lower end of the cover portion 73. A plurality of holder portions 74 for holding 51 are integrally formed. The insulator 71 can also be formed by integrally molding the metal cover 12.
[0090]
The partition 15 holding the arc tube 16 and the lighting circuit 17 is assembled to the cover 12 in which the insulator 71 is incorporated. Thereby, the circuit board 51 of the lighting circuit 17 is engaged with and held by the holder part 74 of the insulator 71, and the electrical component 52 on the circuit board 51 is disposed in an insulated state inside the cover part 73. The circuit board 51 is held by both the partition 15 and the insulator 71, and the position in the cover 12 is stabilized.
[0091]
When the bulb-type fluorescent lamp 11 is turned on, heat generated from the arc tube 16 is transmitted to the partition 15, transmitted from the partition 15 to the metal cover 12, and radiated from the metal cover 12. . The metal cover 12 can efficiently release the heat transmitted from the partition 15 to the outside by convection with the outside air. Thus, an excessive temperature rise of the lighting circuit 17 can be reduced.
[0092]
Even if the partition 15 is composed only of the metal partition plate 26, the same effects as those of the above-described embodiment can be obtained. In this case, the lighting circuit 17 may be held on the partition plate 26 using another holding member, or the partition plate 26 may be attached to the cover 12 directly or using another mounting member.
[0093]
Further, the present invention can be applied to a variety of light bulb-type fluorescent lamps that do not have the globe 14, and the same effect can be obtained.
[0094]
Further, the number of tube bodies 39 of the bulb 37 of the arc tube 16 is not limited to three, and may be four or more, and the same effect can be obtained.
[0095]
【The invention's effect】
According to the light bulb shaped fluorescent lamp according to claim 1, since the partition body integrally formed with the metal partition plate disposed on the arc tube side and the resin holding portion disposed on the non-arc tube side, The arc tube can be assembled to the cover by attaching the arc tube to the partition plate side of the partition body and the lighting circuit to the holding portion side, and the temperature of the arc tube can be increased by a metal partition plate arranged on the arc tube side. The thermal effect on the resin part and lighting circuit due to the rise can be reduced, heat can be efficiently transferred from the metal partition plate with high thermal conductivity to the cover side, and the heat transmitted from the partition to the lighting circuit is suppressed. The temperature rise of the lighting circuit can be reduced. Furthermore, since the partition plate is made of metal, it is not affected by heat from the arc tube or ultraviolet rays as in the case of resin, and it is possible to prevent a decrease in luminous flux and an influence on the lighting circuit. further Since the metal heat dissipating part connected to the partition plate is provided on the outer surface of the cover, the heat dissipating property of the heat transmitted from the partition plate to the heat dissipating part can be improved.
[0096]
Contract Claim 2 According to the described bulb-type fluorescent lamp, the claim 1 In addition to the effects of the described bulb-type fluorescent lamp, the surface of the heat radiating portion is subjected to either coating or surface treatment, so that the heat radiation from the heat radiating portion can be improved.
[0097]
Contract Claim 3 According to the described bulb-type fluorescent lamp, Or 2 In addition to the effect of the described bulb-type fluorescent lamp, the heat absorption layer is formed on the inner surface of the cover, so that the heat in the cover can be efficiently absorbed and radiated from the cover to the outside, and the temperature rise in the cover can be reduced.
[0098]
Claim 4 According to the described bulb-type fluorescent lamp, claims 1 to 3 In addition to the effect of any one of the bulb-type fluorescent lamps, the ratio of the input power to the surface area where the cover excluding the globe and the base is exposed to the outside is 700 W / m ² Thus, the bulb-type fluorescent lamp can be reduced in size, and even if the size is reduced, the influence on the resin portion and the lighting circuit from the arc tube can be reduced.
[0099]
Claim 5 According to the described bulb-type fluorescent lamp, claims 1 to 4 In addition to the effect of any one of the bulb-type fluorescent lamps, the ratio of the input power of the arc tube to the volume of the arc tube is 300 kW / m ^Three Thus, the bulb-type fluorescent lamp can be reduced in size, and even if the size is reduced, the influence on the resin portion and the lighting circuit from the arc tube can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a bulb-type fluorescent lamp showing an embodiment of the present invention.
FIG. 2 is a front view of the same bulb-type fluorescent lamp as seen through a globe.
FIG. 3 is a development view of an arc tube of the bulb-type fluorescent lamp.
FIG. 4 is a plan view of a circuit board of the same bulb-type fluorescent lamp.
FIG. 5 is a schematic diagram showing the heat flow of the bulb-type fluorescent lamp.
FIG. 6 shows a bulb-type fluorescent lamp for an experimental example A in which a partition of a bulb-type fluorescent lamp is formed only of a polybutylene terephthalate (PBT) resin and an experimental example B in which a metal partition plate is integrally formed on the partition. It is a graph which shows the experimental result which measured the average temperature of the lighting circuit at the time of changing the input electric power to a lamp | ramp.
FIG. 7 shows that the heat emissivity when the heat absorption layer is not formed on the inner surface of the cover of the bulb-type fluorescent lamp is 0.08, and the heat emissivity when the heat absorption layer is formed on the inner surface of the cover is 0.8. It is a graph which shows the calculation result which computed the heat flow in the lower part side and upper part side of a cover.
FIG. 8 shows (a) the change in the input power to the bulb-type fluorescent lamp, with regard to Experimental Example C in which the heat absorption layer is not formed on the inner surface of the cover of the bulb-type fluorescent lamp and Experimental Example D in which the heat absorption layer is formed. A graph showing the experimental results of measuring the temperature of the main amalgam part when it is made to be, (b) the part of the capacitor that is one of the circuit components of the lighting circuit when the input power to the bulb-type fluorescent lamp is changed It is a graph which shows the experimental result which measured the temperature of this.
FIG. 9 is a sectional view of a light bulb shaped fluorescent lamp showing a second embodiment of the present invention.
FIG. 10 is an enlarged cross-sectional view of the partition of the bulb-type fluorescent lamp.
FIG. 11 is a bottom view of the partition of the bulb-type fluorescent lamp.
FIG. 12 is a cross-sectional view of a part of a light bulb shaped fluorescent lamp showing a third embodiment of the present invention.
[Explanation of symbols]
11 Bulb-type fluorescent lamp
12 Cover
13 base
15 Partition
16 arc tube
17 Lighting circuit
21 Heat sink
24 Heat absorption layer
26 Partition
27 Holding part

Claims (5)

Arc tube;
A lighting circuit for lighting the arc tube;
A metal partition plate provided at the peripheral edge and provided on the arc tube side and a resin holder disposed on the non-arc tube side are integrally formed to support the arc tube inserted through the partition plate. And a partition that holds at least a part of the lighting circuit in the holding portion;
A cover in which a partition is attached and which houses a lighting circuit held by a holding portion of the partition;
A metal heat dissipating portion provided with a connection surface provided on the outer surface of the cover and contacting the connection surface of the partition plate when the partition is attached to the cover;
A base attached to the cover;
Compact fluorescent lamp, characterized in that it comprises a. Self-ballasted fluorescent lamp according to claim 1, wherein the one of painting and surface treatment on the surface of the heat radiating portion is applied. The bulb-type fluorescent lamp according to claim 1 or 2 , wherein a heat absorption layer is formed on an inner surface of the cover. The cover is provided with a translucent glove covering the arc tube, and the ratio of the input power to the surface area of the cover excluding the glove and the base exposed to the outside is 700 W / m ² or more. The bulb-type fluorescent lamp according to any one of claims 1 to 3 . The bulb-type fluorescent lamp according to any one of claims 1 to 4, wherein the ratio of the input power of the arc tube to the volume of the arc tube is 300 kW / m ³ or more.

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