JP2003151307A - Compact self-ballasted fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp 11 having im proved assembling property and reduced influences on resin parts and a lighting circuit 17. SOLUTION: Both a luminous tube 16 and the lighting circuit 17 are supported by a partitioning body 15, the partitioning body 15 is mounted on a cover 12, and the lighting circuit 17 is stored in the cover 12. The partitioning body 15 has a metal partition plate 26 arranged on the side of the luminous tube 16 and a resin holding part 27 arranged on a side, where no luminous tube exists, the partition plate 26 and the holding part being integrally formed. The metal partition plate 26 arranged on the side of the luminous tube 16 produces reduced thermal influences of the luminous tube 16 on the resin parts and the lighting circuit 17. Heat is efficiently conducted from the metal partition plate 26 with high heat conductivity to the side of the cover 12, the conduction of heat from the partitioning body 15 to the lighting circuit 17 is suppressed, and the temperature rise of the lighting circuit 17 is reduced. The metal partition plate 26 eliminates the influences of such deterioration due to heat and ultraviolet rays from the luminous tube 16 as in a resin and prevents the lowering of luminous flux and the influences on the lighting circuit 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulb-type fluorescent lamp that takes measures against heat.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Application Laid-Open No. 2000-21207, a compact fluorescent lamp has a bent discharge path formed by connecting a plurality of substantially U-shaped tubes in order. A bulb that has a bulb is formed, and an arc tube in which electrodes are sealed is provided at both ends of this bulb, and the ends of each tube body of this arc tube are inserted into and supported by a partition plate made of resin and are connected to the arc tube. A circuit board on which a circuit is mounted is held by a partition plate, the circuit board held by the partition plate is housed in a resin cover having a cap, and the partition plate is attached to the cover.

Some of such light bulb type fluorescent lamps have been downsized to a size close to the standard size of an incandescent light bulb having a rated power of 60 W or the like. The heat generation amount locally increases due to the smaller diameter, which affects 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 its life, and reduces the heat dissipation area of the cover. There is concern that the space inside the cover becomes smaller and the temperature inside the cover rises, which may have a thermal effect on the lighting circuit housed inside the cover.

Further, since the partition plate made of resin is placed in an environment where it is affected by heat and ultraviolet rays from the arc tube, the resin is deteriorated and discolors to brown and the light reflectance is lowered, or the resin is decomposed. When a deteriorated product generated by the gas is released in a gas state and a glove is provided, the deteriorated product adheres to the glove to lower the light transmittance, which may reduce the luminous flux. Furthermore, the resin partition plate may contain a bromine-based flame retardant, for example, in order to ensure flame retardancy. However, if the flame retardant is added in a large amount, heat from the arc tube or ultraviolet rays will be generated. A large amount of gas component is released from the flame retardant under the influence of, and this gas component affects the lighting circuit, which may shorten the life of the compact fluorescent lamp. For example, when a gas component enters from a safety valve of the electrolytic capacitor, the electrolytic capacitor is corroded and damaged, and the driving of the lighting circuit is stopped early.

Further, for example, as described in Japanese Utility Model Publication No. 63-14322, a metal partition plate is used,
There is a fluorescent lamp device in which the metal partition plate efficiently radiates the heat of the arc tube to the outside to prevent an excessive increase in the mercury vapor pressure in the arc tube.

In this fluorescent lamp device, unlike the resin partition plate, the circuit board cannot be held on the metal partition plate in terms of insulation and structure. Therefore, the partition plate and the circuit board are integrally assembled on the cover. It is not possible to install the circuit board in the cover at a position where it is insulated from the partition plate, and then the partition plate must be installed and screwed, and the circuit board and the partition plate must be individually assembled to the cover. .

[0007]

As described above, as the bulb-type fluorescent lamp is further miniaturized, the diameter of the bulb of the arc tube is reduced to increase the amount of heat generation, and the partition due to the temperature rise of the electrode at the end of its life. It affects the melting and deterioration of resin parts such as plates and covers, reduces the heat dissipation area of the cover, reduces the space inside the cover and raises the temperature inside the cover, and it becomes a lighting circuit housed in the cover. There is a problem of thermal influence.

Further, since the partition plate made of resin is placed in an environment affected by heat and ultraviolet rays from the arc tube, the resin is deteriorated and discolors to a brown color, the light reflectance is lowered, and the resin becomes a gaseous state. There is a problem that the luminous flux decreases, such as a decrease in the light transmittance of the globe due to the adherence of the deteriorated substances that have been released, and when the resin partition plate contains a large amount of flame retardant, There is a problem that the gas component released from the flame retardant under the influence of heat or ultraviolet rays affects the lighting circuit.

Further, although the heat dissipation of the arc tube can be improved by using the metal partition plate, since the circuit board cannot be held on the metal partition plate, the circuit board and the partition plate are individually assembled on the cover. Therefore, there is a problem that the assemblability is impaired.

The present invention has been made in view of the above points, has a good assembling property, can reduce a thermal influence on a resin portion, a lighting circuit, and the like, and can provide a luminous flux such as when the partition plate is made of resin. An object of the present invention is to provide a bulb-type fluorescent lamp that can prevent the deterioration and the influence on the lighting circuit.

[0011]

According to a first aspect of the present invention, there is provided a light bulb type fluorescent lamp including a light emitting tube; a lighting circuit for lighting the light emitting tube; a metal partition plate disposed on the light emitting tube side and a non-light emitting tube side. A resin-made holding section disposed integrally with the partition plate, which supports the arc tube inserted through the partition plate and holds at least a part of the lighting circuit in the holding section; A cover that accommodates the lighting circuit held by the holding unit; and a base attached to the cover are provided.

In this structure, since a partition body integrally formed with a metal partition plate disposed on the arc tube side and a resin holding portion disposed on the non-arc tube side is used, The arc tube is integrally attached to the partition plate side, and the lighting circuit is integrally attached to the holding portion side to assemble the cover. Moreover,
The metal partition plate located 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 the metal partition plate with a high thermal conductivity moves from the metal partition plate to the cover side. The heat is efficiently transmitted, the heat transmitted from the partition body to the lighting circuit is suppressed, and the temperature rise of the lighting circuit is reduced. Further, since the partition plate is made of metal, there is no influence of deterioration due to heat or ultraviolet rays from the arc tube as in the case of resin, and a decrease in luminous flux and an influence on the lighting circuit are prevented.

A light bulb shaped fluorescent lamp according to a second aspect is the light bulb shaped fluorescent lamp according to the first aspect, in which a metal heat radiating portion connected to the partition plate is provided on the outer surface of the cover.

Further, in this structure, since the metal heat radiation portion connected to the partition plate is provided on the outer surface of the cover, the heat radiation performance of the heat transmitted from the partition plate to the heat radiation portion is improved.

According to another aspect of the present invention, there is provided a light bulb type fluorescent lamp having an arc tube, a lighting circuit for lighting the arc tube, and a metal partition plate disposed on the arc tube side, which supports the arc tube and does not support the arc tube. A partition body that holds at least a part of the lighting circuit on the arc tube side; a cover that houses the lighting circuit that is attached to the partition body and that is held by the partition body; and a metal that is provided on the outer surface of the cover and is connected to the partition plate. And a cap attached to the cover.

In this structure, the arc tube and the lighting circuit are integrally attached to the partition body and assembled into the cover. In addition, the metal partition plate placed on the arc tube side of the partition reduces the thermal effect on the resin part and lighting circuit due to the temperature rise of the arc tube, and the metal partition plate with high thermal conductivity The heat is efficiently transferred to the cover side, and the heat radiated from the partition plate is efficiently radiated by the metal heat radiation part on the cover side. Therefore, the heat transferred from the partition body to the lighting circuit is suppressed, and the lighting circuit is Temperature rise is reduced. Furthermore, since the partition plate is made of metal,
As in the case of resin, there is no influence of deterioration from heat from the arc tube or ultraviolet rays, and reduction of luminous flux and influence on the lighting circuit are prevented.

A light bulb type fluorescent lamp according to a fourth aspect is the light bulb type fluorescent lamp according to the second or third aspect, in which one of coating and surface treatment is applied to a surface of the heat radiating portion.

In this structure, since the surface of the heat radiating portion is coated or surface-treated, the heat radiation from the heat radiating portion is improved.

The bulb-type fluorescent lamp according to claim 5; an arc tube; a lighting circuit connected to the arc tube; a metal partition plate disposed at least in the center of the surface facing the arc tube.
And a partition body arranged around the partition plate and having a resin holding portion for holding the lighting circuit and configured to support the arc tube; and a lighting circuit to which the partition body is attached and which is held by the partition body. It is provided with a cover housed therein; and a base attached to the cover.

In this structure, a partition body having a metal partition plate disposed at least in the center of the surface facing the arc tube, and a resin holding portion disposed around the partition plate. Therefore, the arc tube and the lighting circuit are integrally attached to the partition body, and the partition body is assembled into the cover. Moreover, the metal partition plate facing the arc tube reduces the thermal influence on the resin part and the lighting circuit due to the temperature rise of the arc tube, and the partition plate made of metal with high thermal conductivity moves from the cover side to the cover side. The heat is efficiently transmitted, the heat transmitted from the partition body to the lighting circuit is suppressed, and the temperature rise of the lighting circuit is reduced. Further, since the partition plate is made of metal, there is no influence of deterioration due to heat or ultraviolet rays from the arc tube as in the case of resin, and a decrease in luminous flux and an influence on the lighting circuit are prevented.

According to a sixth aspect of the present invention, in the light bulb type fluorescent lamp according to any one of the first to fifth aspects, a heat absorbing layer is formed on the inner surface of the cover.

In this structure, since the heat absorption layer is formed on the inner surface of the cover, the heat in the cover is efficiently absorbed and radiated to the outside from the cover, and the temperature rise in the cover is reduced.

A light bulb type fluorescent lamp according to a seventh aspect is the light bulb type fluorescent lamp according to any one of the first to sixth aspects, wherein a translucent globe covering the arc tube is attached to the cover. The ratio of the input power to the surface area of the cover exposed outside is 70.
It is 0 W / m ² or more.

In this structure, the ratio of the input power to the surface area of the cover, excluding the globe and the base, which is exposed to the outside, is 700 W / m ² or more, so that the compact fluorescent lamp can be obtained. Even if the size is reduced, the influence of the arc tube on the resin portion and the lighting circuit is reduced.

According to an eighth aspect of the present invention, in the light bulb type fluorescent lamp according to any one of the first to seventh aspects, the ratio of the input power of the arc tube to the volume of the arc tube is 3%.
It is 00 kW / m ³ or more.

In this structure, the ratio of the input power of the arc tube to the volume of the arc tube is 300 kW / m ³ or more, so that the compact fluorescent lamp is downsized and
Even if the size is reduced, the influence of the arc tube on the resin portion and the lighting circuit is reduced.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

1 to 8 show a first embodiment, FIG. 1 is a sectional view of a compact fluorescent lamp, and FIG. 2 is a front view of the compact fluorescent lamp as seen through a globe. FIG. 3 is a development view of the arc tube of the bulb-type fluorescent lamp,
FIG. 4 is a plan view of the circuit board of the compact fluorescent lamp, and FIG. 5 is a schematic diagram showing the heat flow of the compact fluorescent lamp.
FIG. 6 shows an experimental example A in which the partition body of the light bulb type fluorescent lamp is formed only of the resin of polybutylene terephthalate (PBT) and an experimental example B in which the partition plate made of metal is integrally formed on the partition body. FIG. 7 is a graph showing the experimental results of measuring the average temperature of the lighting circuit when the input power is changed, and FIG. 7 shows the thermal emissivity when the heat absorption layer is not formed on the inner surface of the cover of the light bulb shaped fluorescent lamp. .08, the heat emissivity when the heat absorption layer is formed on the inner surface of the cover is 0.8, and is a graph showing the calculation results of the heat flow rates on the lower side and the upper side of the cover. FIG. Regarding Experimental Example C in which the heat absorption layer is not formed on the inner surface of the cover of the fluorescent lamp and Experimental Example D in which the heat absorption layer is formed, in (a) of the main amalgam when the input power to the bulb-shaped fluorescent lamp is changed. Measure the temperature of the part Graph showing experimental results, is a graph showing experimental results of the temperature of one is part of the capacitor is the circuit components were measured in the lighting circuit in the case of changing the input power to the bulb-type fluorescent lamp (b).

In FIG. 1 and FIG. 2, 11 is a light bulb type fluorescent lamp, and this light bulb type fluorescent lamp 11 includes a cover 12 and a base.
An envelope having 13 and a globe 14, an arc tube 16 attached to the partition body 15 and housed in the envelope, and a lighting circuit.
A fluorescent lamp device having 17 is provided. Then, the envelope has, for example, an outer shape that is close to the standard size of a mini-krypton type light bulb, the dimension in the height direction 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 dimension in the direction is about 45 mm. In the following description, one end of the cover 12, that is, the base 13 side is the upper side, and the other end, that is, the globe 14 and the arc tube 16 side is the lower side.

The cover 12 is made of, for example, a white heat-resistant synthetic resin such as polybutylene terephthalate (PBT), and is formed into a substantially cylindrical shape that expands downward toward the arc tube 16 side.

A heat radiating portion 21 made of metal is integrally formed on the outer peripheral surface of the cover 12 on the arc tube 16 side. The heat radiating portion 21 is formed in a ring shape with a metal material having a higher thermal conductivity than the material of the cover 12, such as aluminum, and the end portion on the arc tube 16 side is projected from the cover 12 and is approximately 45 mm.
A connection surface 22 is formed which is chamfered in a slanting manner at an angle of °.

The surface of the heat radiating portion 21 has a low thermal emissivity of 0.1 or less when the material is aluminum. Therefore, for the purpose of improving the thermal emissivity, white acrylic resin having a higher thermal emissivity than aluminum is used. The heat radiation layer 23 is formed by applying paint or performing surface treatment such as white alumite treatment.

A heat absorbing layer 24 is formed on the inner surface of the cover 12 by applying a heat absorbing paint such as a lacquer black type. The thermal emissivity of the heat absorption layer 24 is 0.8 or more.

The base 13 is an Edison type E17.
A mold or the like covers the upper end portion of the cover 12 after wiring with the lighting circuit 17, and is fixed by an adhesive or caulking.

The globe 14 is transparent or has a light diffusing property such as milky white, and is formed of glass or synthetic resin into a substantially spherical shape similar to the shape of the glass sphere of a mini-krypton type light bulb, and a part thereof. An opening is formed in the opening, and the edge of the opening is fitted into the cover 12 and adhered by an adhesive. In addition, this glove 14
In addition, the brightness uniformity can be improved by combining another member such as a diffusion film, or the globe 14 itself can be omitted.

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 arranged on the side of the arc tube 16 and the side opposite to the arc tube 16 side, that is, the non-partition side. A resin holding portion 27 arranged on the arc tube side is integrally formed.

The partition plate 26 is made of a metal material, such as aluminum, which has a higher thermal conductivity than that of the cover 12.
It is formed in a disk shape having a plate thickness of 3 to 2 mm. Partition plate 26
A plurality of mounting holes 28 through which the arc tube 16 is inserted (see FIG. 1).
1) is formed, and a peripheral surface of the partition plate 26 is formed with a connection surface 29 that is chamfered in an inclined shape of approximately 45 ° so as to project to the outer diameter side from the holding portion 27. The connecting surface 29 is connected to the connecting surface 22 of the heat radiating portion 21 in surface contact with each other in the state where the partition body 15 is attached to the cover 12, and is directly contacted and fixed by welding or the thermal conductivity. Is bonded and fixed with a silicone resin or the like of about 1 to 10 W / mK (Watts per meter Kelvin). The thickness of the partition plate 26 is 0.3 m
If it is thinner than m, 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.

The holder 27 is a partition plate made of a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT).
It is formed by integral molding with 26, and an arc tube holder 30 for holding the arc tube 16 and a lighting circuit holder 31 for holding the lighting circuit 17 are formed. In the arc tube holder 30,
A plurality of mounting holes 32 through which the light emitting tube 16 is inserted are formed, and the light emitting tube 16 is fixed in the mounting hole 32 with an adhesive 33 such as a silicone resin. The lighting circuit holding part 31 has a plurality of circuit board holding claws 34 projecting from the peripheral position of the arc tube holding part 30 and holding the lighting circuit 17.

Further, as shown in FIGS. 1 to 3, the arc tube 16 has a bulb 37 made of glass, and a three-wavelength type phosphor is formed on the inner surface of the bulb 37. A fill gas containing a rare gas such as argon or mercury is filled, and a pair of electrodes 38 are sealed at both ends of the bulb 37 by, for example, pinch seals.

The valve 37 is three pipes in this embodiment.
39, and these pipe bodies 39 have, for example, a pipe outer diameter of 5 to 10
In this embodiment, it is about 6.5 mm, and the pipe inner diameter is 5 mm.
In the present embodiment, a glass tube having a substantially cylindrical cross section having a diameter of at least mm and having a diameter of about 5.2 mm is formed in a substantially U shape having a top portion which is curved at an intermediate portion. That is, each tube 39
Is provided with a curved bent portion 40 and a pair of parallel straight tube portions 41 that are continuous with the bent portion 40 and are parallel to each other. Maximum pipe length is about 35
It is formed to have a size of about mm. The pipe length in the height direction is
The central tubular body 39 is formed slightly longer than the tubular bodies 39 on both sides.

The vicinity of the adjacent ends of each pipe 39 is a communication pipe
1 with a discharge path length of 120 to 200 mm connected in sequence at 42
A continuous discharge path 43 of a book is formed. The communication pipe 42 is
It is formed by connecting the openings formed by blowing and then melting the connected ends of the pipes 39 by heating. The straight pipe portions 41 of each tubular body 39 are arranged at equal intervals on the same circumference centered on the central axis of the bulb-type fluorescent lamp 11, that is, the straight pipe portions 41 of each tubular body 39 have a cross section of six sections. It is arranged corresponding to each vertex of the polygon.

Each pipe 39 has one end sealed with a line seal using a mount or a pinch seal without a mount, and a cylindrical thin pipe 44 also called an exhaust pipe at the other end. It is projected so as to communicate with each other. In this embodiment, the pipes at both ends of the valve 37 are
The thin tube 44 of 39 is provided on the side opposite to the end where the electrode 38 is sealed, that is, on the end on the non-electrode side. Each of these thin tubes 44
After the valve 37 is sequentially sealed by fusing in the manufacturing process, the inside of the valve 37 is evacuated through an unsealed part of each thin tube 44, and after the enclosed gas is filled and replaced, the It is sealed by fusing an unsealed part of the thin tube 44.

Each electrode 38 has a filament coil 45, and the filament coil 45 is supported by a pair (two) of linear wells 46. Each of the wells 46 is led to the outside of the end of the tube body 39 at both ends and connected to the lighting circuit 17 through, for example, a Dumet wire that is sealed to the ends of the tube body 39 at both ends by a pinch seal or the like. Connected to the wire 47.

A main amalgam 48 is enclosed in the thin tube 44 of the tubular body 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 a valve 37
It has the effect of controlling the mercury vapor pressure in the inside to an appropriate range. As the main amalgam 48, one formed of an alloy in which tin, lead, etc. are combined in addition to bismuth and indium may be used. Further, an auxiliary amalgam 49 having the same mercury vapor pressure characteristics as the main amalgam 48 is attached to one of the wells 46 of the electrodes 38 of the tubes 39 at both ends.

The end of each tube 39 of the valve 37 is inserted into the mounting hole 28 of the partition plate 26 of the partition body 15 and the mounting hole 32 of the holding portion 27, and the inside of the holding portion 28 is made of, for example, silicone resin. By filling with an adhesive such as
The end of 39 and the partition 15 are fixed to each other.

Further, the lighting circuit 17, as shown in FIG.
A circuit board 51 having a substantially disk shape, which is held by the partition body 15 and arranged in the cover 12, is provided, and a plurality of circuit boards 51 are provided on one surface of the base 13 side or on both the base 13 side and the arc tube 16 side. The electric component 52 is mounted to form an inverter circuit which is a high frequency lighting circuit for lighting the arc tube 16 at a high frequency.

When mounting electrical components on both sides of the circuit board 51, electrical components 52 such as large electrolytic capacitors and film capacitors, which are relatively weak to heat, that is, have relatively low heat resistance, are arranged on the base 13 side. At the same time, on the side of the arc tube 16, there is a RE such as a rectifying element or a diode bridge having a relatively high heat resistance, that is, a relatively high heat resistance and a small height.
A chip-shaped electric component 52, which is a chip component such as C, a transistor, and a resistor, is arranged.

As shown in FIG. 4, a plurality of through holes 53 through which the thin tubes 44 of the arc tube 16 are inserted are formed in the circuit board 51,
The main amalgam of these through holes 53 on the upper surface side of the circuit board 51.
A plurality of switching elements 54 such as field effect transistors (FETs) are arranged on the side of the through hole 53 through which the thin tube 44 containing 48 is inserted. That is, since the main amalgam 48 in the narrow tube 44 and the plurality of switching elements 54 are arranged close to each other, at the time of starting the bulb-type fluorescent lamp 11, switching elements that easily generate heat relatively quickly among the circuit components.
The heat of 54 heats the main amalgam 48 quickly, the mercury vapor pressure in the arc tube 16 increases rapidly, and the rising characteristics of the luminous flux can be improved.

The bulb-shaped fluorescent lamp 11 thus constructed has an input power rating of 10 W and can obtain a total luminous flux of 480 lm by using a three-wavelength light emitting fluorescent material. At this time, the ratio of the input power to the surface area of the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 exposed to the outside is 700 W / m ² or more, and the arc tube 16
The ratio of the input power of arc tube 16 to the volume of 300 kW
/ M ³ or more. The wall load of the arc tube 16 is 0.1.
W / cm ² or more, but the arc tube 16 having such a high tube wall load has a considerably high temperature during lighting and the UV output also becomes strong, so that the thermal effect on the partition 15 or the effect of ultraviolet irradiation is large. Will be things.

FIG. 5 schematically shows the heat flow of the bulb-type fluorescent lamp 11.

The heat generated in the arc tube 16 is transmitted to the globe 14 by convection and radiation of air in the globe 14, a path to the partition body 15, and a path to the circuit board 51 through the wire 47 of the arc tube 16. There is.

The flow of heat into the lighting circuit 17 includes heat transferred to the circuit board 51 through the wire 47 of the arc tube 16 and heat transferred from the partition 15.

The heat that flows into the lighting circuit 17 and the heat that the lighting circuit 17 self-heats have a path that is transmitted to the cover 12 by the convection and radiation of air in the cover 12, and a path that is transmitted to the lighting fixture through the base 13.

The heat flowing into the cover 12 includes the heat transmitted from the globe 14, the heat transmitted by the convection of air from the partition body 15, the circuit board 51 and the base 13, and the heat transmitted from the partition body 15.
There is heat transmitted by radiation from the lighting circuit 17.

In order to suppress the temperature rise of the lighting circuit 17, it is important to reduce the amount of heat transferred from the partition body 15.

FIG. 6 shows the results of an experiment in which the average temperature of the lighting circuit 17 was measured when the input power was changed while the compact fluorescent lamp 11 was lit. In the experiment, the power supply voltage was varied between an experimental example A in which the partition 15 was formed only of a resin of polybutylene terephthalate (PBT) and an experimental example B in which the partition plate 26 made of aluminum metal was integrally formed on the partition 15. Change the input power. The ambient temperature is 25 ° C., and the temperature measurement is a simple average value obtained by measuring 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.

As a result of the experiment, a partition plate 26 made of metal is attached to the partition body 15.
In the experimental example B in which the metal plate was integrally formed, the average temperature was reduced by about 5 ° C. as compared with the experimental example A in which the metal partition plate 26 was not used and only the resin was used.

When the metal partition plate 26 is used,
Since the partition plate 26 has a high thermal conductivity, as shown in FIG.
The amount of heat transferred from the partition plate 26 to the cover 12 is increased, whereby the amount of heat transferred from the partition plate 26 to the lighting circuit 17 is reduced, and an excessive rise in temperature of the lighting circuit 17 can be reduced. In other words, the partition plate 26 shuts off the heat of the arc tube 16 and the lighting circuit 17
The excessive temperature rise of can be reduced.

Further, by providing the metal heat dissipation portion 21 in contact with the partition plate 26 on the cover 12 side, the heat transmitted from the partition plate 26 to the heat dissipation portion 21 can be efficiently dissipated to the outside. From the heat dissipation part 21, there are heat taken away by convection with the outside air and heat taken away by heat radiation.

In the light bulb type fluorescent lamp 11, since the temperature of the cover 12 rises to about 80 ° C., the heat radiation from the heat radiating portion 21 is effective, but the heat radiation rate of metal such as aluminum is 0.1 or less. Since the metal surface of the heat dissipation part 21 is exposed, sufficient heat radiation cannot be obtained. Therefore, the surface of the heat dissipation portion 21 is coated with a white acrylic paint having a higher heat emissivity than aluminum, or subjected to a surface treatment such as a white alumite treatment to form the heat emissive layer 23. Can be improved. Moreover, by making the heat radiating portion 21 white, when the bulb-shaped fluorescent lamp 11 is turned on in the lighting fixture, the reflectance of light is high, the efficiency of the fixture can be improved, and the appearance can be improved.

By disposing the heat dissipating portion 21 only on a part of the resin cover 12 on the side of the arc tube 16, the heat transmitted from the partition plate 26 is efficiently dissipated at the heat dissipating portion 21, and the heat dissipating portion 21 is made of resin. The heat transferred to the cover 12 part of the
The temperature inside the cover 12 can be lowered so that the heat inside 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.

As described above, according to the bulb-type fluorescent lamp 11, the metallic partition plate 26 disposed on the side of the arc tube 16 and the arc tube.
Since the partition body 15 integrally formed with the resin holding portion 27 arranged on the non-light emitting tube side opposite to the 16 side is used, the light emitting tube 16 is held on the partition plate 26 side of this partition body 15. The lighting circuit 17 can be integrally attached to the part 27 side and assembled to the cover 12.

Moreover, the metal partition plate 26 disposed on the side of the arc tube 16 melts or deteriorates the resin portion such as the holding portion 27 of the partition body 15 and the cover 12 due to the temperature rise of the electrode 38 at the end of its life. It is possible to reduce the thermal influence on the resin part, the lighting circuit 17, etc. due to the temperature rise of the arc tube 16.
In addition, the metal partition plate 26, which has a high thermal conductivity, covers the cover 12
The heat can be efficiently transferred to the side, the heat transferred from the partition 15 to the lighting circuit 17 can be suppressed, and an excessive temperature rise that affects the lighting characteristics of the lighting circuit 17 can be reduced.

Further, since the partition plate 26 is made of metal, there is no influence of deterioration due to 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 a resin, the partition plate 26 changes its color to dark brown to lower the light reflectance, or a deteriorated product of the resin adheres to the globe 14 to lower the light transmittance, or to the resin. It is possible to reliably prevent the influence of the gas component released from the contained flame retardant on the electric parts of the lighting circuit 17.

Therefore, the ratio of the input power to the surface area of the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 exposed to the outside is 700 W / m ² or more, and the volume of the arc tube 16 emits light. The ratio of the input power of the tube 16 is 300 kW / m ³ or more. By using the arc tube 16, the bulb-shaped fluorescent lamp 11 can be downsized, and the influence of the arc tube 16 on the resin part and the lighting circuit 17 is reduced. it can.

Further, since the inside of the cover 12 is a sealed space, the lighting circuit 17 accommodated in the cover 12 excessively rises in temperature to affect the lighting characteristics, or is placed in the cover 12. The temperature of the main amalgam 48 of the arc tube 16 rises excessively, and the mercury vapor pressure cannot be maintained properly. Therefore, in order to reduce the temperature inside the cover 12,
The heat absorbing layer 24 is formed by applying, for example, a lacquer type black paint to the inner surface of the. The thermal emissivity of the heat absorption layer 24 is 0.8
That is all.

As shown in FIG. 5, in the cover 12, 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 are transferred. is there.

FIG. 7 shows the heat emissivity when the heat absorption layer 24 is not formed on the inner surface of the cover 12 and 0.08, and the heat emissivity when the heat absorption layer 24 is formed on the inner surface of the cover 12. A calculation result of calculating the heat flow rates on the lower side and the upper side of the cover 12 is shown as 0.8. By increasing the thermal emissivity, the heat flow rate of the cover 12 is 0.96-0.76 on the lower side.
= 0.2W, 0.84-0.75 = 0.09W on the upper side
Increased. When the average air temperature of the lighting circuit 17 is, for example, 111.5 ° C. as the heat flow rate of the cover 12 increases,
A calculation result was obtained that was reduced to 105.4 ° C.

In FIG. 8A, the heat absorption layer 2 is formed on the inner surface of the cover 12.
Experimental example C in which 4 is not formed, and the heat absorption layer 2 is formed on the inner surface of the cover 12.
Experimental example D in which 4 is formed and experimental results of measuring the temperature of the main amalgam 48 portion when the input power to the bulb-type fluorescent lamp 11 is changed are shown. In addition, in FIG. 8B, a light bulb type fluorescent lamp 11 includes 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 capacitor part which is one of the circuit components of the lighting circuit 17 at the time of changing the input electric power to is shown.

As a result of the experiment, the heat absorption layer 24 is formed on the inner surface of the cover 12.
In Experimental Example D in which the heat absorbing layer 24 was formed, the temperature was lower than that in Experimental Example C in which the heat absorption layer 24 was not formed on the inner surface of the cover 12.

This is because when the heat absorption layer 24 is formed on the inner surface of the cover 12, as shown in FIG. 5, the heat transmitted to the cover 12 by the convection of the air in the cover 12 is absorbed by applying the black paint. This is because the layer 24 efficiently absorbs heat on the cover 12 side and radiates heat to the outside air through the cover 12.
This can reduce excessive temperature rise in the cover 12,
Excessive temperature rise of 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 maintained appropriately.

Next, FIGS. 9 to 11 show a second embodiment. FIG. 9 is a sectional view of a compact fluorescent lamp, FIG. 10 is an enlarged sectional view of a partition of the compact fluorescent lamp, and FIG. It is a bottom view of the partition of a light bulb type fluorescent lamp. The first
The same components as those in the embodiment are designated by the same reference numerals and the description thereof will be omitted.

The partition body 15 includes a partition plate 26 made of metal, which is disposed at least in the center of the surface facing the arc tube 16, and a partition plate.
A resin holding portion 27 that is arranged around 26 and holds the lighting circuit 17 is integrally formed by combining by, for example, insert molding or snapshot. The metal partition plate 26 may also serve as a member for supporting the arc tube 16, and the arc tube 16 is supported exclusively by a resin holding portion 27.
You may

The partition plate 26 is made of a metal material, such as aluminum, which has a higher thermal conductivity than that of the cover 12.
It is formed in a disk shape with a plate thickness of 3 to 2 mm, and has a partition plate 26.
Inside, a pair of substantially V-shaped mounting holes 28 through which the straight tube portions 41 of the tube bodies 39 of the arc tube 16 are inserted are formed. Each straight tube portion of each tube body 39 of the arc tube 16 is fitted into the pair of mounting holes 32.
With 41 inserted, an adhesive 33 such as silicone resin is filled and fixed between the upper surface side of the partition plate 26 and the arc tube 16. If the thickness of the partition plate 26 is thinner than 0.3 mm, the strength is low, and if it exceeds 2 mm, the arc tube 16 and the cover 12 are damaged by the drop test in the packaged state.

The holding portion 27 is made of a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT), and has an annular partition plate retaining ring 61 arranged around the partition plate 26. A fitting groove 62 is formed in the inner periphery of the partition plate holding ring 61 so that the peripheral edge of the partition plate 26 is closely fitted.
An annular cover mounting portion that is attached to the cover 12 by protruding from the outer peripheral surface of the partition plate retaining ring 61 is provided on the upper end of the partition plate retaining ring 61.
A cover groove 63 is formed on the outer periphery of the cover mounting portion 63 so as to be locked by a lock protrusion (not shown) protruding from the inner surface of the cover 12. A plurality of circuit board holding claws 65 for holding the circuit board 51 of the lighting circuit 17 are formed on the inner periphery of the cover mounting portion 63 at the upper end of the partition plate holding ring 61.

Further, the arc tube 16 has a height H of the central tube body 39.
1 is 35 to 40 mm, and the height H2 of the tubular body 39 on both sides is 35 to 4
The relationship is 0 mm and H1> H2. Central tube
The height H1 of 39 and the height H2 of the tubular bodies 39 on both sides mean the length from the valve sealing end to the top of the bent portion 40.

Three pipes having an outer diameter d of 5 to 10 mm
The arc tubes 16 connected by arranging 39 so that their U-shaped surfaces face each other have a width dimension a of 30 to 35 mm in the direction intersecting the bulb arranging direction of the central tube body 39, When the width dimension of the arc tube 17 in the valve juxtaposition direction is b and the width dimension of the tube bodies 39 on both sides in the direction intersecting the bulb juxtaposition direction is c,
0.9a ≧ b ≧ 0.75a 0.9a ≧ c ≧ 0.75a
Have a relationship such that

For example, the width a of the central tube 39 is about 32.
mm, the width c of the tubular body 39 on both sides is about 26 mm,
The width dimension b of the arc tube 16 is formed to be about 26 mm. Corresponding to these width dimensions, the bent portion 40 of the central tube 39
And the pipe length in the height direction between the end of each straight pipe portion 41 is about 37 mm, and the pipe length in the height direction between the bent portion 40 of the tubular body 39 on both sides and the end of each straight portion 41 is about 34 mm. Has been formed.

If b exceeds 0.9a, the width of the arc tube 16 in the diagonal direction becomes large, which is not suitable for downsizing. b is 0.
If it is less than 75a, the light distribution in the rotating direction of the arc tube 16 becomes uneven, which is not preferable. If c exceeds 0.9a, the width of the arc tube 16 in the diagonal direction becomes large, which is not suitable for downsizing. If c is less than 0.75a, the discharge path length of the arc tube 16 is shortened, and the lamp efficiency is reduced.

As described above, the respective tube bodies 39 approach each other due to the regulation of the width dimension b of the arc tube 16 in the juxtaposed direction of the bulbs. Then, the width dimension c of the tube body 39 on both sides can be lengthened to secure the discharge path length, and the distance to the globe 14 is increased, and the height direction of the tube body 39 is correspondingly increased to increase the discharge path length. Therefore, the length of the discharge tube 16 can be increased, so that the discharge path length of the discharge tube 16 can be secured and the light emission efficiency can be improved while the size of the discharge tube 16 is reduced.

The arc tube 16 has a height H of the central tube body 39.
1 is 35 to 40 mm, and the height H2 of the tubular body 39 on both sides is 35 to 4
0 mm, H1> H2, and the discharge path length is 12
The total luminous flux is 450 lm or more and the lamp efficiency is 45 l when the lamp is powered by 7 to 12 W.
It is configured to be m / W or more. At this time, the ratio of the input power to the surface area of the cover 12 excluding the globe 14 and the base 13 of the bulb-shaped fluorescent lamp 11 exposed to the outside is 700 W / m ² or more, and the volume of the arc tube 16 corresponds to the arc tube 16. Input power ratio is 300 kW / m ³
That is all. Light bulb type fluorescent lamp 11 using this arc tube 16
Can be used as a light source having a light output equivalent to that of a small incandescent light bulb and having substantially the same size.

It has been confirmed by experiments that the discharge path length needs to be 120 mm or more in order to obtain a light output substantially equal to that of a small incandescent lamp. That is, if the discharge path length is less than 120 mm, the 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 housed within the external dimensions that are approximately the same as the small incandescent lamp. Therefore, the discharge path length is 120-200m
m.

The maximum width of the arc tube 16 is 45 mm in order to fit the arc tube 16 within the outer dimensions of a small incandescent lamp.
Hereafter, it should be preferably 40 mm or less, and the height is also limited to 40 mm or less. Under this condition, in order to obtain the arc tube 16 having a discharge path length of 120 to 200 mm, a lighting test was conducted with various bulbs having different tube diameters, and the tube outer diameter was 5 to 10 mm and the height was 35 to 40 mm. It was confirmed by an experiment that sufficient light output and lamp efficiency can be obtained by constructing the arc tube 16 by combining the central tube body 39 of the above.

The outer diameter of the arc tube 16 is limited to 10 mm or less in order to make the discharge path length 120 mm or more. However, by setting the tube outer diameter to 10 mm or less, the lamp current is suppressed as much as possible and the lamp voltage is reduced. It has become possible to raise 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 remarkable as the power consumption decreases. Therefore, in the arc tube with a lamp power of 12 W or less, the discharge path length is 120 to 200 mm. It is desirable that the diameter be 10 mm or less. When the outer diameter of the tube is less than 5 mm, the starting voltage increases and the lamp efficiency decreases, and the arc tube 16 is also complicated to manufacture.

Therefore, the central pipe 39 has a pipe outer diameter of 5 to 5.
10 mm and the maximum height is within the range of 35 to 40 mm.
In consideration of the manufacturing process and arc tube efficiency, it may be preferable that the maximum height of the central tube body 39 is 30 to 55 mm, but if the manufacturing process and arc tube efficiency are not affected, the height is 35 to 35 mm. It is desirable to set it within the range of 40 mm.

If the height H1 of the central tube 39 exceeds 40 mm, it is difficult to achieve the same size as a small incandescent lamp, and if it is less than 35 mm, it is difficult to secure a desired discharge path length. Become.

When the height H2 of the tube bodies 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 arc tube 16 rotates. The symmetry is impaired, and if it is less than 30 mm, it becomes difficult to secure a desired discharge path length.

According to the light bulb type fluorescent lamp 11 thus constructed, the metallic partition plate 26 is provided at least at the center of the surface facing the arc tube 16, and the periphery of the partition plate 26. Since the partition body 15 having the resin-made holding portion 27 disposed in the partition body 15 is used, the arc tube is attached to the partition plate 26 of the partition body 15.
The lighting circuit 17 can be integrally attached to the holding portion 27 and the lighting device 16 can be easily assembled to the cover 12 via the holding portion 27.

Moreover, the metal partition plate 26 facing the arc tube 16 can reduce the thermal influence on the resin portion, the lighting circuit 17, etc. due to the temperature rise of the arc tube 16, and can be made of metal having a high thermal conductivity. The heat can be efficiently transferred from the partition plate 26 to the cover 12 side, the heat transferred from the partition body 15 to the lighting circuit 17 can be suppressed, and the temperature rise of the lighting circuit 17 can be reduced. In particular, partition boards
Since the end portion of the arc tube 16 inserted through the mounting hole 28 of the 26 is adhered and fixed to the partition plate 26 with an adhesive 33 such as a silicone resin, the heat of the arc tube 16 is passed through the adhesive 33 to make a metal partition plate. 26
Can be efficiently transmitted to the lighting circuit 17, and the thermal influence on the lighting circuit 17 can be reduced.

Further, since the partition plate 26 is made of metal, there is no influence of deterioration due to 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 a resin, the partition plate 26 changes its color to dark brown to lower the light reflectance, or a deteriorated product of the resin adheres to the globe 14 to lower the light transmittance, or to the resin. It is possible to reliably prevent the influence of the gas component released from the contained flame retardant on the electric parts of the lighting circuit 17.

Therefore, the ratio of the input power to the surface area of the cover 12 excluding the globe 14 and the base 13 of the bulb-type fluorescent lamp 11 is 700 W / m ² or more, and the volume of the arc tube 16 emits light. The ratio of the input power of the tube 16 is 300 kW / m ³ or more, so that the compact fluorescent lamp 11 can be miniaturized, and the influence of the arc tube 16 on the resin portion and the lighting circuit 17 can be reduced.

Next, FIG. 12 shows a third embodiment,
FIG. 12 is a sectional view of a part of the bulb-type fluorescent lamp. The same components as those in each of the above-described embodiments are designated by the same reference numerals and the description thereof will be omitted.

The cover 12 is made 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 heat emissivity, or may be subjected to a surface treatment such as a white alumite treatment to form a heat emissive layer.

An insulator 71 made of a heat-resistant synthetic resin material having an insulating property such as polybutylene terephthalate (PBT) is integrally incorporated inside the cover 12. On the insulator 71, a base attachment portion 72 for protruding the upper end of the cover 12 to attach the base 13, a cover portion 73 arranged in contact with the inner surface of the cover 12, and the cover portion 73.
A plurality of holder parts 74 for projecting from the lower end of and holding the circuit board 51 are integrally formed. The insulator 71 can also be formed by integrally molding the cover 12 made of metal.

The partition 12 holding the arc tube 16 and the lighting circuit 17 is assembled to the cover 12 in which the insulator 71 is incorporated. As a result, the circuit board 51 of the lighting circuit 17 is engaged with and held by the holder portion 74 of the insulator 71, and the electric component 52 on the circuit board 51 is arranged inside the cover portion 73 in an insulated state. The circuit board 51 is held by both the partition body 15 and the insulator 71,
The position within the cover 12 is stable.

When the bulb-type fluorescent lamp 11 is turned on, the heat generated from the arc tube 16 is transmitted to the partition body 15,
This partition body 15 propagates to the metal cover 12 and radiates heat from the metal cover 12. The metal cover 12 can efficiently dissipate the heat transmitted from the partition body 15 to the outside by convection with the outside air, so that the amount of heat transferred from the partition body 15 to the lighting circuit 17 is reduced, and the heat inside the cover 12 becomes excessive. The temperature rise of the lighting circuit 17 can be suppressed and the excessive temperature rise of the lighting circuit 17 can be reduced.

Even if the partition 15 is composed of only the partition plate 26 made of metal, the same operational effect as that of the above-described embodiment can be obtained. In this case, the lighting circuit 17 may be held on the partition plate 26 by using another holding member, or the partition plate 26 may be attached to the cover 12 directly or by using another attachment member.

Further, the present invention can be applied to a bulb-type fluorescent lamp of a type that does not include the globe 14, and the same effect can be obtained.

The tube 39 of the bulb 37 of the arc tube 16 is 3
The number of books is not limited to four, and four or more books may be used, and similar effects can be obtained.

[0100]

According to the self-ballasted fluorescent lamp of the first aspect, a partition in which a metallic partition plate disposed on the arc tube side and a resin holding portion disposed on the non-arc tube side are integrally formed. Since the body is used, the arc tube can be integrally attached to the partition plate side of the partition body and the lighting circuit can be integrally attached to the holding portion side, and the partition plate made of metal can be arranged on the arc tube side. This can reduce the thermal effect on the resin part and lighting circuit due to the temperature rise of the arc tube, and can efficiently transfer heat from the metal partition plate with high thermal conductivity to the cover side, from the partition to the lighting circuit. The heat transmitted can be suppressed, and the temperature rise of the lighting circuit can be reduced. Further, since the partition plate is made of metal, there is no influence of deterioration due to heat or ultraviolet rays from the arc tube unlike in the case of resin, and it is possible to prevent a decrease in luminous flux and an influence on the lighting circuit.

According to the compact fluorescent lamp of the second aspect, in addition to the effect of the compact fluorescent lamp of the first aspect,
Since the metal heat radiation part connected to the partition plate is provided on the outer surface of the cover, the heat radiation performance of the heat transmitted from the partition plate to the heat radiation part can be improved.

According to the bulb-type fluorescent lamp of the third aspect, the arc tube and the lighting circuit can be integrally attached to the partition body and assembled into the cover, and moreover, the metal is arranged on the arc tube side of the partition body. The partition plate made of metal can reduce the thermal effect on the resin part and the lighting circuit due to the temperature rise of the arc tube, and can efficiently transfer heat from the metal partition plate with high thermal conductivity to the cover side and the cover side. The heat radiated from the partition plate can be efficiently radiated by the metal heat radiating portion, so that the heat transmitted from the partition body to the lighting circuit can be suppressed and the temperature rise of the lighting circuit can be reduced. Further, since the partition plate is made of metal, there is no influence of deterioration due to heat or ultraviolet rays from the arc tube unlike in the case of resin, and it is possible to prevent a decrease in luminous flux and an influence on the lighting circuit.

According to the compact fluorescent lamp of the fourth aspect, in addition to the effect of the compact fluorescent lamp of the second or third aspect, the surface of the heat radiating portion is coated or surface-treated. The heat radiation from the heat radiation part can be improved.

According to the fifth aspect of the self-ballasted fluorescent lamp of the present invention, the metallic partition plate is provided at least in the center of the surface facing the arc tube, and the resin partition plate is provided around the partition plate. Since a partition with a holding part is used, the arc tube and the lighting circuit can be integrally attached to this partition and assembled into the cover, and the temperature of the arc tube can be controlled by the metal partition plate facing the arc tube. It is possible to reduce the thermal influence on the resin part and the lighting circuit due to the rise, and also to efficiently transfer the heat from the metal partition plate with high thermal conductivity to the cover side, suppressing the heat transferred from the partition body to the lighting circuit. The temperature rise of the lighting circuit can be reduced. further,
Since the partition plate is made of metal, there is no effect of deterioration due to heat or ultraviolet rays from the arc tube unlike in the case of resin, and it is possible to prevent a decrease in luminous flux and an effect on the lighting circuit.

According to the light bulb type fluorescent lamp of the sixth aspect, in addition to the effect of the light bulb type fluorescent lamp of any one of the first to fifth aspects, the heat absorbing layer is formed on the inner surface of the cover. The heat can be efficiently absorbed and the heat can be radiated from the cover to the outside, and the temperature rise in the cover can be reduced.

According to the light bulb type fluorescent lamp of the seventh aspect, in addition to the effect of the light bulb type fluorescent lamp of any one of the first to sixth aspects, the cover excluding the globe and the base is exposed to the outside. Since the ratio of the input power to the existing surface area is 700 W / m ² or more, the compact fluorescent lamp can be downsized, and even if it is downsized, the influence of the arc tube on the resin part and the lighting circuit can be reduced.

According to the compact fluorescent lamp of the eighth aspect, in addition to the effect of the compact fluorescent lamp of any one of the first to seventh aspects, the ratio of the input power of the luminous tube to the volume of the luminous tube is 300 kW. Since / m ³ or more, the compact fluorescent lamp can be downsized, and even if downsized, the influence of the arc tube on the resin portion and the lighting circuit can be reduced.

[Brief description of drawings]

FIG. 1 is a 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 above bulb-type fluorescent lamp.

FIG. 4 is a plan view of a circuit board of the above bulb-type fluorescent lamp.

FIG. 5 is a schematic diagram showing a heat flow of the bulb-type fluorescent lamp.

FIG. 6 is the same as Example 1 in which the partition body of the bulb-type fluorescent lamp is made of only the resin of polybutylene terephthalate (PBT), and Experimental example B in which the partition body made of metal is integrally formed. It is a graph which shows the experimental result which measured the average temperature of the lighting circuit when input power to a lamp was changed.

FIG. 7: Same as above, assuming 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. 5 is a graph showing calculation results of heat flow rates calculated on the lower side and the upper side of the cover.

FIG. 8 is an experimental example C in which a heat absorbing layer is not formed on the inner surface of the cover of the bulb-type fluorescent lamp and an experimental example D in which the heat absorbing layer is formed.
Regarding, and (a) is a graph showing the experimental results of measuring the temperature of the main amalgam part when the input power to the bulb-type fluorescent lamp is changed, (b) 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 capacitor part which is one of the circuit components of the lighting circuit at the time of making it.

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 a partition of the above bulb-type fluorescent lamp.

FIG. 11 is a bottom view of the partition of the above bulb-type fluorescent lamp.

FIG. 12 is a partial cross-sectional view of a bulb-type fluorescent lamp showing a third embodiment of the present invention.

[Explanation of symbols] 11 Light bulb type fluorescent lamp 12 cover 13 Base 15 partitions 16 arc tube 17 Lighting circuit 21 Heat sink 24 Heat absorption layer 26 Partition board 27 Hold

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F21S 5/00 E (72) Inventor Shinichiro Matsumoto 4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Litec stock In-house (72) Inventor Hiroyuki Matsunaga 4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo F-term (reference) within Toshiba Litec Co., Ltd. 3K014 AA04 LA06 LB04 5C043 AA09 AA13 CC09 CD03 CD06 DD39 EA19

Claims (8)

[Claims] 1. An arc tube; a lighting circuit for lighting the arc tube; a metal partition plate arranged on the arc tube side and a resin holding part arranged on the non-arc tube side are integrally formed; A partition body that supports the arc tube inserted through the partition plate and that holds at least a part of the lighting circuit in the holding portion; a cover that is attached to the partition body and that houses the lighting circuit held in the holding portion of the partition body; A bulb-type fluorescent lamp, comprising: a base attached to the. 2. A metal heat radiation part connected to the partition plate is provided on the outer surface of the cover.
The described bulb-shaped fluorescent lamp. 3. An arc tube; a lighting circuit for lighting the arc tube; and a metal partition plate arranged on the arc tube side to support the arc tube and at least one of the lighting circuits on the non-arc tube side. A partition body that holds the part; a cover that accommodates the lighting circuit that is attached to the partition body and that is held by the partition body;
A bulb-type fluorescent lamp, comprising: a base attached to a cover; 4. The bulb-type fluorescent lamp according to claim 2, wherein the surface of the heat radiating portion is coated or surface-treated. 5. An arc tube; a lighting circuit connected to the arc tube; a metallic partition plate disposed at least in the center of a surface facing the arc tube; and a lighting circuit arranged around the partition plate. A partition body having a resin-made holding portion for holding the arc tube and configured to support the arc tube; a cover to which the partition body is attached and which accommodates the lighting circuit held by the partition body; A light bulb-shaped fluorescent lamp, characterized in that it has a base. 6. The bulb-type fluorescent lamp according to claim 1, wherein a heat absorption layer is formed on the inner surface of the cover. 7. A translucent globe covering the arc tube is attached to the cover, and the ratio of input power to the surface area of the cover excluding the globe and the cap is 700 W / m ² or more. 7. The bulb-type fluorescent lamp according to claim 1, wherein the fluorescent lamp is a bulb. 8. The bulb-type fluorescent lamp according to claim 1, 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.