JP2008047342A - Arc tube, single-piece fluorescent lamp, and bulb-type fluorescent lamp - Google Patents

Abstract

[PROBLEMS] To improve the lamp efficiency of a fluorescent lamp using an arc tube having a bent glass tube that spirally rotates around a rotation axis and has a substantially cylindrical appearance.
In an arc tube 1 in which a bent glass is spirally swirled around a swivel axis and the outer shape is formed in a substantially cylindrical shape, the outer diameter direction of the bent glass tube 2 with respect to the outer diameter Dao of the tube. The ratio Gd / Dai of the shortest distance gap Gd between adjacent glass tubes is set to a range of 0.2 to 0.6, and a tube outer diameter is set to a range of 5.0 to 9.0 mm. And
[Selection] Figure 2

Description

  The present invention relates to an arc tube having a bent glass tube that spirally turns and has a substantially cylindrical appearance. The present invention also relates to a light bulb-type fluorescent lamp using such an arc tube and replacing a general light bulb.

With the era of energy saving, fluorescent lamps are being widely used in the lighting field as energy-saving light sources to replace low-efficiency general light bulbs.
For example, in a light bulb-type fluorescent lamp, an arc tube is held in an eggplant-shaped outer bulb, an electronic ballast for lighting the arc tube, and an E-type base that houses the electronic ballast and is the same as a general bulb It is equipped with a case.

  By the way, in the technical development of conventional fluorescent lamps, first, downsizing to the same shape as a general light bulb and improvement of lamp efficiency have been pursued. In recent years, arc tubes made of bent glass tubes, which are formed so that the outer shape of the glass tube is turned from the center in a spiral shape around the pivot axis and the outer shape is formed into a cylindrical shape, have been applied. Improvements are being made further. (For example, refer to Patent Document 1).

The typical configuration of the arc tube 101 in the conventional lamp 120 having a lamp input 12W shown in FIG. 5 is that the double spiral bent glass tube 102 has an outer diameter Dao of 9.0 mm and an inner diameter Dai of 7.4 mm. The distance Le is set to 400 mm.
Further, in the bent glass tube 102 spirally wound around the turning axis, the gap Gd between the glass tubes in the radial direction of the bent glass tube 102 is 1.0 mm, and the ratio Gd / Dao with respect to the tube outer diameter Dao is It is set to 0.11, the number of turns N is about 4.5, the ring outer diameter Da is set to 36.5 mm, and the total length La of the pipe is set to about 65 mm.

The tube outer diameter Dao refers to the diameter of the bent glass tube 102, and the ring outer diameter Da refers to the diameter when the entire arc tube 101 is viewed from the extending direction of the pivot axis.
With the above configuration, the bulb-type fluorescent lamp 120 with a lamp input 12W commercialized as a substitute for the ordinary bulb 60W has an outer diameter (D0) 55 mm of the eggplant-shaped outer bulb 122 and a total length (L0) 110 mm. It is downsized to a size that is substantially the same as a light bulb. An excellent characteristic of an initial luminous flux of 810 lm and an efficiency of η67.5 lm / W is obtained at a lamp input of 12 W (in addition, a 60 W general bulb has outer dimensions of D060 mm and L0110 mm, and characteristics of 810 lm and η13.5 lm). / W).
JP 2003-263972 A

As disclosed in the prior art (Patent Document 1), the 12W bulb-type fluorescent lamp 120 with an outer bulb has a light flux value immediately after starting the lamp, in addition to the features of small size and high efficiency. Compared to, it is popularized as a replacement for general light bulb 60W.
However, with recent efforts to save energy, the market demands further improvement in efficiency of fluorescent lamps.

  The present invention has been made in view of the above situation, and an object thereof is to improve the lamp efficiency of a fluorescent lamp using an arc tube whose outer shape is formed into a substantially cylindrical shape by turning a bent glass in a spiral shape. And

  In order to solve the above-mentioned problems, an arc tube according to claim 1 of the present invention is an arc tube having a bent glass tube that is spirally swiveled around a swivel axis and whose external shape is substantially cylindrical. In the bent glass tube, the ratio of the gap of the shortest distance between adjacent glass tubes in the tube outer diameter direction to the tube outer diameter is in the range of 0.2 to 0.6, and the tube outer diameter is 5.0 to It is characterized by being set in a range of 9.0 mm.

Here, the spiral shape includes various spiral shapes such as a single spiral and a double spiral, and the cylindrical shape includes polygonal shapes such as an ellipse, a triangle, and a quadrangle in cross section.
In addition, here, the appearance of the substantially cylindrical shape indicates that the bent glass tube is formed by turning on substantially the same track when viewed from the extending direction of the spiral axis.
The arc tube according to claim 2 of the present invention is the arc tube according to claim 1, wherein the inner diameter of the bent glass tube is in the range of 4.0 to 7.0 mm, and the tube wall load of the arc tube. Are set in the range of 0.07 to 0.10 W / cm ² , respectively.

  Furthermore, in order to solve the above-mentioned problems, the single-piece fluorescent lamp according to claim 3 of the present invention is a light-emitting tube in which a bent glass tube is spirally swiveled around a swivel axis, and an external shape is formed in a substantially cylindrical shape. And a single-piece fluorescent lamp having a case that holds the arc tube and has a base, and the shortest of adjacent glass tubes in the tube outer diameter direction with respect to the tube outer diameter in the bent glass tube The distance gap ratio is set in the range of 0.2 to 0.6, and the pipe outer diameter is set in the range of 5.0 to 9.0 mm.

The single-piece fluorescent lamp according to claim 4 of the present invention is the single-piece fluorescent lamp according to claim 3, wherein the bent glass tube has an inner diameter of 4.0 to 7.0 mm and the arc tube. The tube wall load is set in the range of 0.07 to 0.10 W / cm ² .
Further, in order to solve the above-mentioned problem, the light bulb shaped fluorescent lamp according to claim 5 of the present invention is a light emitting tube in which a bent glass tube is spirally swiveled around a swivel axis, and an external shape is formed in a substantially cylindrical shape. And a bulb-type fluorescent lamp that holds the arc tube and has a base and a built-in electronic ballast, the outer diameter direction of the tube with respect to the outer diameter of the tube in the bent glass tube The ratio of the gap of the shortest distance between adjacent glass tubes is set in a range of 0.2 to 0.6, and a tube outer diameter is set in a range of 5.0 to 9.0 mm.

The bulb-type fluorescent lamp according to claim 6 of the present invention is the bulb-type fluorescent lamp according to claim 5, wherein a tube inner diameter of the bent glass tube is in a range of 4.0 to 7.0 mm and the arc tube. The tube wall load is set in the range of 0.07 to 0.10 W / cm ² .

When the arc tube according to claim 1 is used for a fluorescent lamp, the lamp efficiency η is reduced to about 1 as compared with, for example, the ratio Gd / Dao of 0.11 in the conventional lamp while suppressing the enlargement of the arc tube. It can be improved by ~ 5%, and a more efficient fluorescent lamp can be obtained as an energy saving light source for replacing a general light bulb.
In addition, when the arc tube according to claim 2 is used for a fluorescent lamp, the lamp is particularly compared with the conventional lamp when the tube inner diameter Dai is 7.4 mm and the tube wall load we is about 0.12 W / cm ^2. Efficiency can be improved by about 7-25%.

The single-piece fluorescent lamp according to claim 3 has a lamp efficiency η of about 1 to 5% as compared with, for example, the ratio Gd / Dao of 0.11 in the conventional lamp while suppressing the increase in size of the arc tube. As a result, it will become a more efficient single-ended fluorescent lamp as an energy-saving light source for replacing ordinary light bulbs.
In addition, the single-cap fluorescent lamp according to claim 4 has a lamp efficiency of about 0.1% as compared with the conventional lamp, for example, when the tube inner diameter Dai is 7.4 mm and the tube wall load we is about 0.12 W / cm ^2. 7-25% improvement.

Further, in the light bulb shaped fluorescent lamp according to claim 5, for example, the ratio Gd / Dao in the conventional lamp is 0. 0 while suppressing the increase in the size of the arc tube and keeping the external shape substantially the same size as the general light bulb 60W. As compared with the case of 11, the lamp efficiency η is improved by about 1 to 5%, and a more efficient light bulb-type fluorescent lamp is obtained as an energy saving light source for replacing a general light bulb.
In addition, the bulb-type fluorescent lamp according to claim 6 has a lamp efficiency that is approximately the same as that of the conventional lamp, for example, when the tube inner diameter Dai is 7.4 mm and the tube wall load we is approximately 0.12 W / cm ^2. 7-25% improvement.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
<1. Configuration>
FIG. 1 and FIG. 2 show configurations of a bulb-type fluorescent lamp with an outer bulb, which is an embodiment of the present invention, which is an alternative to a general bulb 60W, for example, and the arc tube thereof.
The arc tube 1 is composed of a double helix bent glass tube 2 whose outer shape is formed into a substantially cylindrical shape.

At both tube ends 3 and 4 of the bent glass tube 2, so-called multi-winding (for example, four-fold) tungsten filament coil electrodes 5 and 6 are provided.
A pair of electrode lead wires 7 a-7 b and 8 a-8 b respectively holding the filament coil electrodes 5 and 6 by a bead glass mounting method are hermetically sealed to the tube ends 3 and 4.
Here, each of the filament coil electrodes 5 and 6 is filled with an electron emitting material mainly composed of BaO—CaO—SrO, and an exhaust pipe 9 is also provided at one end of the tube 3 together with the filament coil electrode 6. Sealed.

A fluorescent material 10 is applied to the main inner surface of the arc tube 1, and about 5 mg of mercury Hg and about 500 Pa of argon gas as a buffer gas are sealed in the tube.
In such a configuration, the arc tube 1 has a tip portion 13 inflated, and a convex portion 14 is further formed here, and a coldest spot is provided inside the tip of the convex portion 14. . The mercury vapor pressure in the arc tube 1 when the lamp is lit is uniquely defined by the temperature at the coldest spot.

Further, as the phosphor 10, for example, a rare earth system is used, and three types of red, green, and blue light-emitting Y ₂ O ₃ : Eu, LaPO ₄ : Ce, Tb, and BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn A mixture of phosphors was used. In addition, a mixed rare gas composed of argon, neon, krypton, or the like may be enclosed as a buffer gas.
A bulb-type fluorescent lamp 20 (hereinafter referred to as a lamp 20) according to the present embodiment is disposed in an eggplant-shaped outer tube bulb 22 made of glass in a state where the arc tube 1 is held by a holding resin member 21. In addition, an electronic ballast 23 with a conversion efficiency of 90%, which is a so-called series inverter system for lighting, is incorporated in the holding resin member 21 and is incorporated in the resin case 24. A base 25 is attached to the end of the case 24.

In this case, in particular, the tip portion 13 including the convex portion 14 of the arc tube 1 is joined to the inner surface of the tip of the outer tube bulb 22 by a heat conductive medium 26 made of silicone resin. Thereby, the temperature of the coldest spot formed in the convex part 14 of the arc tube 1 is controlled to the optimum range in which the lamp efficiency η in the highest region can be obtained.
Further, for example, a diffusion film 27 having a transmittance of about 97% mainly composed of calcium carbonate is applied to the inner surface of the outer tube valve 22.

In addition, in order to maintain the features as a substitute for the general light bulb 60W, the external shape and dimensions of the lamp 20 are maintained to be substantially the same external shape and size as the general light bulb 60W (Do: 60 mm in the figure, Lo: 110 mm in the figure). It was to be.
Hereinafter, the tube outer diameter Dao refers to the diameter of the bent glass tube 2, and the ring outer diameter Da refers to the diameter when the entire arc tube 1 is viewed from the extending direction of the swivel axis.
<2. Verification>
Here, the inventor searched and examined means for achieving a further improvement in lamp efficiency η while maintaining the external shape of the lamp 20 for replacing the general light bulb 60W substantially the same as that of the general light bulb 60W.

Specifically, the objective was to improve the lamp efficiency by 1% or more compared to the conventional value (67.5 lm / W) of the conventional lamp 120 (FIG. 5).
Here, the reason why it is set to 1% or more is that when the arc tube 1 is actually manufactured as a product, an error due to variation in characteristics of each product is taken into consideration.
As a result, it has been found that the following two requirements are effective means for increasing the lamp efficiency η as features of the configuration of the lamp 20 according to the present embodiment.

That is, first, the requirement (1) is the ratio of the gap Gd between the tubes (2a to 2e) generated in the direction of the outer diameter Dao to the outer diameter Dao of the double spiral bent glass tube 2 forming the arc tube 1. Gd / Dao is set in the range of 0.2 to 0.6.
Requirement (2) is that, in the arc tube 1 of Requirement (1), the tube inner diameter Dai of the double spiral bent glass tube is in the range of 4.0 to 7.0 mm and the tube wall load we (tube input) Is defined by a value obtained by dividing the inner surface area πDai · Le corresponding to the inter-electrode distance Le) within a range of 0.10 W / cm ² or less.

Hereinafter, the reason why the requirements (1) and (2) are set in the lamp 20 and the effects obtained thereby will be sequentially described.
(Regarding requirement (1))
First, the inventor examined the relationship between the efficiency η of the lamp 20 and the ratio Gd / Dao. In this case, the tube outer diameter Dao of the bent glass tube 2 is 9.0 mm, the tube inner diameter Dai is 7.4 mm, the interelectrode distance Le is 400 mm, and the number of turns N for winding the glass tube in a spiral shape is about 4.5 times. When the annular outer diameter Da is kept constant at 36.5 mm, the lamp 20 is made of the arc tube 1 with the gap Gd, that is, the ratio Gd / Dao changed, and the lamp 20 is turned on at the lamp input 10W. The lamp efficiency η was measured.

As a result, as shown in FIG. 3, the lamp efficiency η particularly increases relatively steeply when the ratio Gd / Dao is in the range of 0.2 to 0.4, and then compared in the range of 0.4 or more. It rises slowly and tends to saturate in the range larger than 0.6.
Here, it can be seen that when the ratio Gd / Dao is around 0.2, the lamp efficiency is increased by about 1% compared to the conventional value (67.5 lm / W) of the conventional lamp 120.

Therefore, it is appropriate to set the ratio Gd / Dao within a range of 0.2 or more.
Here, the increase in the lamp efficiency η is such that the luminescent component once emitted from the bent glass 2 into the inner hollow region is efficiently released to the outside of the arc tube 1 through the gap Gd by the increase in the ratio Gd / Dao. Because.
On the other hand, the ratio Gd / Dao is larger than 0.6 because the lamp efficiency η is hardly improved and the total length La of the bent glass tube 2 is further increased. It is not preferable because it becomes large.

Therefore, it is appropriate to set the ratio Gd / Dao in a range of 0.6 or less from the viewpoint of suppressing the arc tube 1 from being enlarged.
As a result, the ratio Gd / Dao was set to a relatively large range of 0.2 to 0.6 with respect to 0.11 in the conventional lamp 120. As a result, the lamp efficiency η of the lamp 20 according to the present embodiment can be improved by about 1 to 5% as compared with the ratio Gd / Dao0.11 in the conventional lamp 120.

Here, if the tube outer diameter Dao of the bent glass tube 2 is set in the range of 5.0 to 9.0 mm, the arc tube 1 can be increased in size by increasing the ratio Gd / Dao of the bent glass tube 2. Thus, the external shape of the lamp 20 can be kept small and approximately the same as that of a general light bulb 60W (the outer diameter Do of the outer bulb is 60 mm and the total length Lo of the lamp is 110 mm).
Here, the tube outer diameter Dao is set to be smaller than 5.0 mm because it is extremely difficult to form the bent glass tube 2 forming the arc tube 1, and it is difficult to design a long-life small electrode. This is difficult because the strength of the steel becomes insufficient.
(Regarding requirement (2))
The inventor further increased the ratio Gd / Dao to 0.4 based on the above requirement (1) and kept it constant, while the lamp 20 comprising the arc tube 1 with the tube inner diameter Dai and the tube wall load we varied. And the relationship between the lamp efficiency η, the tube inner diameter Dai, and the tube wall load we was examined.

When the ratio Gd / Dao of the conventional lamp 120 is increased to 0.4, the lamp efficiency is 70.5 lm / W.
As a result, as shown in FIG. 4, the tube inner diameter Dai of the bent glass tube 2 is set within a range of 4.0 to 7.0 mm, and the tube wall load we is set within a range of 0.10 W / cm ² or less. Thus, it has been found that the lamp efficiency can be improved by about 7 to 25% compared to the lamp efficiency (70.5 lm / W) when the ratio Gd / Dao of the conventional lamp 120 is increased to 0.4.

Eventually, tube inner diameter Dai and wall load we may for 7.4mm and 0.12 W / cm ² in the conventional lamp 120, as small as 4.0~7.0mm and 0.10 W / cm ² or more range Was set to As a result, the efficiency η of the lamp 20 according to the present embodiment can be improved by about 8 to 31% compared with the ratio Gd / Dao in the conventional lamp 120 of 0.11.
<3. Prototype>
Finally, in order to reconfirm the effect of the present invention, a prototype of the lamp 20 having the configuration of the present embodiment was made, and various characteristics thereof were measured. In this case, the lamp input is first set to 10 W, where the circuit efficiency of the electronic ballast 23 is 90%, and thus the tube input to the arc tube 1 is set to 9 W.

Next, the shape and dimensions of the arc tube 1 are set such that the tube outer diameter Dao of the main part is 7.5 mm, the tube inner diameter Dai is 6.5 mm, and the inter-electrode distance Le is 480 mm. We is set to about 0.09 W / cm ² . In addition, the gap Gd of the double spiral bent glass tube 2 is 3.0 mm, the ratio Gd / Dao is 0.4, the number of winding layers N is about 5.3 times, and the outer ring diameter Da is 36.5 mm. The tube total length La was set to 60 to 75 mm (for example, about 66 mm), respectively. The lamp external shape was set such that the outer diameter Do of the outer tube bulb 122 was 55 mm and the total lamp length Lo was 110 mm.

Here, the main part is a turning part of the arc tube 1 and refers to a part excluding the vicinity of the end part and the folded part.
The lamp 20 has an excellent lamp characteristic with a luminous flux of 820 lm and an efficiency of 82.0 lm / W at a lamp input of 10 W, and the effects of the present invention have been reconfirmed (however, the above characteristic values are the same for the lamp 20). Average value of the light).

With this configuration, a more efficient light bulb shaped fluorescent lamp can be obtained as an energy saving light source for replacement of the general light bulb 60W.
<4. Supplement>
As described above, the arc tube and the bulb-type fluorescent lamp according to the present invention have been described based on the embodiment, but the invention is not limited to the configuration shown in the embodiment, and various modifications are possible as described below. is there.
(About fluorescent lamps)
(1) In the above embodiment, the light bulb-type fluorescent lamp for replacing the general light bulb 60W has been described. However, the present invention is not limited to this. For example, the present invention is not limited to this. It can also be applied to. At this time, naturally, the distance between the electrodes varies depending on the luminous flux of the general light bulb to be replaced.
(2) In the above embodiment, a bulb-type fluorescent lamp has been described. However, the present invention is not limited to this, and the present invention uses a bent glass tube wound in a spiral shape as an arc tube, and an electronic ballast for lighting. The present invention can also be applied to a so-called compact fluorescent lamp without a built-in lamp.
(3) Although the outer tube valve shown in the above embodiment is a so-called A-type, the present invention is not limited to this, and the present invention can also be applied to T-shaped and G-shaped outer tube valves. It is. Furthermore, the present invention can be applied to a D-type bulb-type fluorescent lamp without an outer bulb and a compact fluorescent lamp without an external bulb.
(About arc tube)
(1) In the above embodiment, the arc tube swung in a double spiral shape has been described. However, the present invention is not limited to this, and may be, for example, a single spiral shape.
(2) In the above embodiment, the bent glass tube has a cylindrical appearance. However, the present invention is not limited to this. For example, the shape when the arc tube is viewed from the extending direction of the turning shaft. May be of an elliptical shape or a polygonal shape such as a triangle or a quadrangle.

  The present invention can be widely applied to a fluorescent lamp that uses a luminous tube having a bent glass tube that spirally rotates around a rotation axis and has a substantially cylindrical bent glass tube, and improves lamp efficiency. This is a useful technology.

It is a front view which shows the structure of the lightbulb-type fluorescent lamp 20 which is embodiment of this invention. 2 is a front view showing the configuration of the arc tube 1 of the bulb-type fluorescent lamp 20. FIG. 4 is a graph showing the relationship between the ratio Gd / Dao and the lamp efficiency η in the arc tube 1 4 is a graph showing the relationship between the tube inner diameter Dai and tube wall load we and the lamp efficiency in the arc tube 1. It is a front view which shows the structure of the conventional bulb-type fluorescent lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting tube 2 Bent glass tube 5, 6 Filament coil electrode 7, 8 Electrode lead wire 9 Exhaust tube 10 Phosphor 20 Light bulb-type fluorescent lamp 21 Holding resin member 22 Outer bulb 23 Electronic ballast 24 Case 25 Base 26 Thermal conductivity Medium 27 Diffusion film

Claims (6)

An arc tube having a bent glass tube that spirally swivels around a swivel axis and has a substantially cylindrical appearance.
In the bent glass tube, the ratio of the gap of the shortest distance between adjacent glass tubes in the tube outer diameter direction to the tube outer diameter is in the range of 0.2 to 0.6, and the tube outer diameter is 5.0 to 9. An arc tube characterized by being set in a range of 0.0 mm. The inner diameter of the bent glass tube is set in a range of 4.0 to 7.0 mm, and the tube wall load of the arc tube is set in a range of 0.07 to 0.10 W / cm ^2. The arc tube according to claim 1. A single-end fluorescent lamp comprising a light-emitting tube having a bent glass tube spirally rotated around a rotation axis and having an outer appearance formed in a substantially cylindrical shape, and a case holding the light-emitting tube and having a base. And
In the bent glass tube, the ratio of the gap of the shortest distance between adjacent glass tubes in the tube outer diameter direction to the tube outer diameter is in the range of 0.2 to 0.6, and the tube outer diameter is 5.0 to 9. A single-cap fluorescent lamp characterized by being set in a range of 0.0 mm. The inner diameter of the bent glass tube is set in a range of 4.0 to 7.0 mm, and the tube wall load of the arc tube is set in a range of 0.07 to 0.10 W / cm ^2. The single-piece fluorescent lamp according to claim 3. An arc tube having a bent glass tube spirally swiveled around a pivot axis and having an external appearance formed in a substantially cylindrical shape, and a case that holds the arc tube and has a base and incorporates an electronic ballast A light bulb shaped fluorescent lamp provided,
In the bent glass tube, the ratio of the gap of the shortest distance between adjacent glass tubes in the tube outer diameter direction to the tube outer diameter is in the range of 0.2 to 0.6, and the tube outer diameter is 5.0 to 9. A bulb-type fluorescent lamp characterized by being set in a range of 0.0 mm. The inner diameter of the bent glass tube is set in a range of 4.0 to 7.0 mm, and the tube wall load of the arc tube is set in a range of 0.07 to 0.10 W / cm ^2. The bulb-type fluorescent lamp according to claim 5.

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