WO2008018415A1 - Arc tube, single-base fluorescent lamp and compact fluorescent lamp - Google Patents

Abstract

Arc tube (1) comprising glass tubes (2) circling in double helical form and presenting a tubular appearance as a whole; filament coils (5,6) fitted at both ends of the glass tubes; phosphor (10) applied to the inside surface of the glass tubes; and mercury and argon gas hermetically charged in the glass tubes. The ratio of the gap between glass tubes adjacent to each other in a double helical zone (Gd) to the outside diameter of each of the glass tubes (Dao), Gd/Dao, is in the range of 0.2 to 0.6, and the outside diameter of each of the glass tubes (Dao) is in the range of 5.0 to 9.0 mm. The use of this arc tube would enhance the luminous efficiency of compact fluorescent lamp.

Description

 Specification

 Arc tube, single-piece fluorescent lamp, and bulb-type fluorescent lamp

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to an arc tube having a bent glass tube that swirls in a spiral shape and has a substantially cylindrical appearance. The present invention also relates to an electric fluorescent lamp that uses such an arc tube and replaces a general light bulb.

 Background art

 [0002] With the era of energy saving, fluorescent lamps have been promoted as an energy-saving light source that replaces low-efficiency general light bulbs in the lighting field.

 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 that houses the electronic ballast and is the same as a general light bulb With a case to attach the base!

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, an arc tube composed of a bent glass tube formed by turning a glass tube from its center and spirally turning around a pivot axis to form a cylindrical appearance has been applied. And further improvement in efficiency. (For example, see Patent Document 1).

[0004] The typical configuration of the arc tube 101 in the conventional lamp 120 with a lamp input of 12 W shown in FIG. 5 is that the double spiral bent glass tube 102 has a tube outer diameter Dao of 9. Omm and a tube inner diameter Dai of 7.

The distance between electrodes Le is set to 400 mm at 4 mm.

 In addition, the bent glass tube 10 in the bent glass tube 102 spirally wound around the swivel axis is provided.

The gap Gd between the two radial glass tubes is 1. Omm and the ratio to the tube outer diameter Dao

Gd / Dao is set to 0.11, the number of turns N is set to about 4.5, the ring outer diameter Da is set to 36.5 mm, and the total pipe length La is set to about 65 mm.

[0005] The tube outer diameter Dao refers to the diameter of the bent glass tube 102, and the ring outer diameter Da represents the arc tube 1

01 Refers to the diameter when the whole is viewed from the extending direction of the swivel axis.

With the above configuration, the lamp input 12W power commercialized as a 60W replacement for general light bulbs. The spherical fluorescent lamp 120 has an outer diameter (DO) of 55 mm of the eggplant-shaped outer tube bulb 122 and a total length of the lamp (L 0) of 110 mm, and is downsized to a size substantially equivalent to that of a general light bulb. Excellent characteristics of initial light flux of 8101m and efficiency 7] 67. 51m / W are obtained with a lamp input of 12W. And 7] 13. 51 m / W).

 Patent Document 1: JP 2003-263972 A

 Disclosure of the invention

 Problems to be solved by the invention

[0006] As disclosed in the prior art (Patent Document 1), the 12W fluorescent lamp 120 with an outer bulb has a light flux value immediately after starting the lamp, in addition to its small size and high efficiency. Compared to amalgam-enclosed lamps, it has been improved and is widely used as a replacement for ordinary 60W bulbs.

 However, as the recent efforts to save energy deepen, the factory is demanding further improvements in the efficiency of fluorescent lamps.

[0007] The present invention has been made in view of the above situation, and improves the lamp efficiency of a fluorescent lamp using an arc tube whose outer shape is formed into a substantially cylindrical shape by spirally turning bent glass. Let's call it Mejiro.

 Means for solving the problem

[0008] In order to solve the above-mentioned problem, the arc tube according to claim 1 of the present invention is a arc tube having a bent glass tube that is spirally swiveled around a swivel axis and has a substantially cylindrical appearance. In the bent glass tube, the ratio 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. It is set in the range of 0 to 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 means that the bent glass tube is formed by swirling on substantially the same orbit 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 set in a range of 4.0 to 7. Omm, and the tube wall load of the arc tube is set in a range of 0.07-0.10 W / cm ² . .

 [0010] Further, in order to solve the above-mentioned problem, the single-piece fluorescent lamp according to claim 3 of the present invention is configured such that a bent glass tube is spirally swiveled around a swivel axis, and an external shape is formed in a substantially cylindrical shape. A single lamp fluorescent lamp comprising an arc tube and a case that holds the arc tube and has a cap, wherein the adjacent glass in the tube outer diameter direction with respect to the tube outer diameter in the bent glass tube The ratio of the gap between the shortest distances between the tubes is set in the range of 0.2 to 0.6, and the outer diameter of the tube is set in the range of 5.0 to 9. Omm.

[0011] Further, 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 tube inner diameter of the bent glass tube is in a range of 4.0 to 7. Omm, and The tube wall load of the arc tube is set in a range of 0.07-0.lOW / cm ² , respectively.

 Furthermore, in order to solve the above-mentioned problem, the light bulb-type 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 tube outer diameter corresponding to the tube outer diameter in the bent glass tube The ratio of the gap of the shortest distance between adjacent glass tubes in the direction is set in the range of 0.2 to 0.6, and the outer diameter of the tube is set in the range of 5.0 to 9. Omm.

[0012] Further, 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. Omm. The tube wall load of the arc tube is set in a range of 0.07-0.lOW / cm ² , respectively.

 The invention's effect

[0013] When the arc tube according to claim 1 is used for a fluorescent lamp, the lamp efficiency is reduced as compared with the conventional lamp, for example, when the ratio Gd / Dao is 0.11, while suppressing the increase in size of the arc tube. Can be improved by about 1 to 5%, and a more efficient fluorescent lamp can be obtained as an energy-saving light source for general light bulbs. In addition, when the arc tube according to claim 2 is used for a fluorescent lamp, the lamp in the conventional lamp in particular, for example, compared with a case where 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%.

[0014] The single-piece fluorescent lamp according to claim 3 suppresses an increase in the size of the arc tube, and has a lamp efficiency of 7] that is approximately lower than that in the conventional lamp, for example, when the ratio Gd / Dao is 0.11; Improved by ~ 5%, resulting in a more efficient single-neck fluorescent lamp as an energy-saving light source for general light bulbs. In addition, the single-tube fluorescent lamp according to claim 4 has a lamp efficiency of about 7 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. ~ 25% improvement.

 [0015] In addition, the bulb-type fluorescent lamp according to claim 5 suppresses an increase in the size of the arc tube, maintains an external shape substantially the same size as that of a general light bulb 60W, and has a ratio Gd / D, for example, in the conventional lamp. Compared to when ao is 0.11, the lamp efficiency 7] is improved by about 1 to 5%, and it becomes a more efficient light bulb-type fluorescent lamp as an energy-saving light source for general light bulb replacement.

Further, the bulb-type fluorescent lamp according to claim 6 has a lamp efficiency of about 7 as compared with the conventional lamp particularly when the tube inner diameter Dai is 7.4 mm and the tube wall load we is about 0.12 W / cm ^2. ~ 25% improvement.

 Brief Description of Drawings

 FIG. 1 is a front view showing a configuration of a bulb-type fluorescent lamp 20 according to an embodiment of the present invention.

 FIG. 2 is a front view showing the configuration of the arc tube 1 of the bulb-type fluorescent lamp 20.

 FIG. 3 is a graph showing the relationship between the ratio Gd / Dao and the lamp efficiency η in the arc tube 1.

 FIG. 4 is a graph showing the relationship between the inner diameter Dai and the tube wall load we and the lamp efficiency in the arc tube 1.

 FIG. 5 is a front view showing a configuration of a conventional bulb-type fluorescent lamp.

 Explanation of symbols

[0017] 1 arc tube

 2 bent glass tube

 5, 6 Filament coil electrode

7, 8 electrode lead wire 9 Exhaust pipe

 10 Phosphor

 20 Bulb-type fluorescent lamp

 21 Holding resin

 22 Outer pipe valve

 23 Electronic ballast

 24 cases

 25 base

 26 Thermally conductive media

 27 Diffusion membrane

 BEST MODE FOR CARRYING OUT THE INVENTION

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, for example, an alternative to a general bulb 60W, 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.

[0019] On both ends 3 and 4 of the bent glass tube 2, so-called multi-winding (for example, four-fold) tandastane filament coil electrodes 5 and 6 are installed!

 A pair of electrode lead wires 7a-7b and 8a-8b holding the filament coil electrodes 5 and 6 by a bead glass mounting method are hermetically attached to the tube ends 3 and 4, respectively.

 Here, each of the filament coil electrodes 5 and 6 is filled with an electron emitting material mainly composed of BaO—CaO—SrO, and one of the tube end portions 3 has an exhaust pipe 9 in addition to the filament coil electrode 6. Sealed.

[0020] Then, a phosphor 10 is applied to the main inner surface of the arc tube 1, and about 5 mg of mercury Hg is contained in the tube, and about 500 Pa of argon gas is enclosed as a buffer gas.

In such a configuration, the arc tube 1 has its tip portion 13 inflated, and further has a convex portion 14 formed therein, and a coldest spot is provided inside the tip portion of the convex portion 14. ing. The mercury vapor pressure in the arc tube 1 when the lamp is lit is uniquely defined by the temperature at the coldest spot.

 [0021] Further, as the phosphor 10, for example, a rare earth system is used, and three kinds of red, green, and blue light emitting YO: Eu, LaPO: Ce, Tb, and BaMg AlO: Eu, Mn phosphors are used. Mixed too

2 3 4 2 16 27

 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 “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, the 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 built in the resin case 24! /. The base 25 is attached to the end of the case 24! /.

 In this case, in particular, the tip 13 including the convex portion 14 of the arc tube 1 is coupled to the inner surface of the tip of the outer tube bulb 22 by a heat conductive medium 26 made of silicone resin. As a result, the temperature at the coldest spot formed on the convex portion 14 of the arc tube 1 is controlled to the optimum range in which the lamp efficiency 7] in the highest region can be obtained.

 Further, on the inner surface of the outer tube valve 22, for example, a diffusion film 27 having a transmittance of about 97% mainly composed of calcium carbonate is applied.

 [0023] In addition, in order to maintain the features as a replacement for the general light bulb 60W, the external shape and dimensions of the lamp 20 are approximately the same as the general light bulb 60W (Do: 60mm in the figure, Lo: 110mm in the figure). And decided to keep the dimensions.

 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 pivot axis.

 <2.Verification>

 Here, the inventor searched for and examined 'means for further improving the lamp efficiency 7] while maintaining the external shape of the lamp 20 as a substitute for the general light bulb 60W substantially the same as that of the general light bulb 60W.

Specifically, the aim was to improve the lamp efficiency by 1% or more compared to the conventional value (67.51 m / W) of the conventional lamp 120 (FIG. 5). Here, 1% or more is considered because an error due to variation in characteristics of each product is taken into consideration when the arc tube 1 is actually manufactured as a product.

 As a result, it has been found that the following two requirements are effective means for increasing the lamp efficiency 7] as features of the configuration of the lamp 20 according to the present embodiment.

That is, first, the requirement (1) is that in the double spiral bent glass tube 2 forming the arc tube 1.

The ratio Gd / Dao of the gap Gd between the tubes (2a to 2e) generated in the direction of the outer diameter Dao with respect to the outer diameter Dao is set in the range of 0.2 to 0.6.

Requirement (2) further includes the tube inner diameter Dai of the double spiral-shaped bent glass tube in the arc tube 1 of requirement (1) in the range of 4.0 to 7. Omm and the tube wall load we (tube input) Is defined as the value divided by the pipe inner surface area π Dai · Le corresponding to the electrode distance Le) within the range of 0.1 OW / cm ² or less.

[0026] The reason why the above requirements (1) and (2) are set for the lamp 20 and the effects obtained thereby will be described in order below.

 (Requirement (1))

 First, the inventor examined the relationship between the efficiency 20] of the lamp 20 and the ratio Gd / Dao. In this case, the outer diameter Dao of the bent glass tube 2 is 9.0 mm, the 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 prototype lamp 20 consisting of arc tube 1 with the ring outer diameter Da kept constant at 36.5 mm, while changing the gap Gd, that is, the ratio Gd / Dao, was lit at a lamp input of 10 W. The lamp efficiency η was measured.

As a result, as shown in FIG. 3, in particular, the lamp efficiency η first increases relatively steeply in the range of the ratio Gd / Dao from 0.2 to 0.4, and then increases to 0.4 or more. In the range, it rises relatively slowly, and in the range greater than 0.6, it shows a saturation tendency.

 Here, it can be seen that when the ratio Gd / Dao is near 0.2, the lamp efficiency is increased by about 1% compared to the conventional value of the conventional lamp 120 (67.51 m / W).

[0028] Therefore, it is reasonable to set the ratio Gd / Dao within a range of 0.2 or more.

Here, the increase in lamp efficiency 7] is due to the fact that the luminescent component once radiated from the bent glass 2 into the inner hollow region efficiently passes through the gap Gd as the ratio Gd / Dao increases. It is because it is discharged to the outside.

 On the other hand, the ratio Gd / Dao becomes larger than 0.6 because the lamp efficiency 7] is hardly improved and the total length La of the bent glass tube 2 is increased more than that.

This is preferable because Lo is larger.

[0029] Therefore, it is appropriate to set the ratio Gd / Dao within a range of 0.6 or less from the viewpoint of suppressing the arc tube 1 from being enlarged.

 Eventually, 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 7] of the lamp 20 according to the present embodiment can be improved by about 1 to 5% as compared with the ratio Gd / Dao 0.11.

[0030] 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 becomes larger due to the increase in the ratio Gd / Dao of the bent glass tube 2. Suppressing shaping, lamp

Appearance of 20 general bulb 60W (outer bulb bulb outer diameter Do is 60mm and lamp total length Lo is

110mm) can be kept as small as the size.

 Note that the tube outer diameter Dao is set smaller than 5.0 mm here because it is extremely difficult to mold 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 tube 2 is insufficient.

 (Requirement (2))

 The inventor further increased the ratio Gd / Dao to 0.4 based on the above requirement (1) and kept it constant, while at the same time changing the tube inner diameter Dai and the tube wall load we with the lamp 1 comprising the arc tube 1 20 The relationship between the lamp efficiency 7], the inner diameter Dai, and the tube wall load we was examined.

[0031] The conventional lamp 120 with the ratio Gd / Dao increased to 0.4 has a lamp efficiency of 70.

 51m / W.

As a result, as shown in FIG. 4, the inner diameter Dai of the bent glass tube 2 is set within the range of 4.0 to 7.0 mm, and the tube wall load we is set within the 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 (70.51 m / W) when the ratio Gd / Dao of the conventional lamp 120 is increased to 0.4.

After all, the tube inner diameter Dai and the tube wall load we are 7.4 mm and 0.1 in the conventional lamp 120. For 2 W / cm ² , it was set to a small range of 4.0 to 7. Omm and 0.10 W / cm ² or more. As a result, the efficiency 7] of the lamp 20 according to the present embodiment can be improved by about 8 to 31% compared with the ratio Gd / Dao of the conventional lamp 120 of 0.11.

 <3. Prototype>

 Finally, in order to reconfirm the effect of the present invention, the lamp 20 having the configuration of the present embodiment was made as a prototype, 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%, so the tube input to the arc tube 1 is set to 9 W.

[0033] Next, the shape and dimensions of the arc tube 1 were set such that the tube outer diameter Dao of the main part was 7.5 mm, the tube inner diameter Dai was 6.5 mm, and the interelectrode distance Le was 480 mm. wall loading we will have been set to about 0.09W / 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 diameter Da is 36.5 mm. The total pipe length La was set to 60 to 75 mm (eg, about 66 mm). The external appearance of the lamp was set to 55mm for the outer diameter Do of the outer bulb 122 and 110mm for the overall length Lo of the lamp.

 [0034] Here, the main part refers to a swivel part of the arc tube 1, excluding the vicinity of the end part and the folded part.

 The lamp 20 has an excellent lamp characteristic with a luminous flux of 8201 m and an efficiency of 82.01 m / W at a lamp input of 10 W, and the effect of the present invention has been reconfirmed (however, the above characteristic value is! / Also, the deviation is the average value of 20 lamps).

 [0035] 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 embodiments. However, the present invention is not limited to the configurations shown in the embodiments, and various modifications are possible as shown below. It is.

 (About fluorescent lamps)

(1) In the above embodiment, a bulb-type fluorescent lamp for replacing a general bulb 60W is described. The present invention, which is not limited to this, can also be applied to, for example, a light bulb-type fluorescent lamp as a substitute for 40 W and 100 W general light bulbs. At this time, naturally, the distance between the electrodes varies depending on the luminous flux of the general electric bulb to be replaced.

 (2) In the above embodiment, the force described for the bulb-type fluorescent lamp, and the present invention, which is not limited to this, uses a spirally wound bent glass tube as the arc tube, and stabilizes the electronic stability for lighting. It can also be applied to a lamp with a built-in lamp, a single-piece fluorescent lamp, a V, or a compact fluorescent lamp.

 (3) Although the outer pipe 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-type and G-type outer pipe valves. is there. Furthermore, the present invention can also 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 cylindrical shape of the bent glass tube has been described as 1S. For example, it is not limited to this. It may be in the form of a polygon such as a triangle or a rectangle.

Industrial applicability

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

Claims

The scope of the claims  [1] An arc tube having a bent glass tube that spirally swivels around a swivel axis and has an outer appearance that is substantially cylindrical.  In the bent glass tube, the ratio 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 in that it is set in the Omm range. [2] The inner diameter of the bent glass tube is set in a range of 4.0 to 7. Omm, and the tube wall load of the arc tube is set in a range of 0.07-0.l OW / cm ² . The arc tube according to claim 1, characterized by the above.  [3] A single-piece base provided with a light-emitting tube having a curved glass tube spirally swiveled around a swivel axis and having an external appearance formed in a substantially cylindrical shape, and a case that holds the light-emitting tube and has a base. A fluorescent lamp,  In the bent glass tube, the ratio 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-piece fluorescent lamp characterized in that it is set within the range of Omm! /. [4] The inner diameter of the bent glass tube is set in the range of 4.0 to 7. Omm, and the tube wall load of the arc tube is set in the range of 0.07-0.l OW / cm ² . The single-piece fluorescent lamp according to claim 3, wherein [5] A bent glass tube spirally swivels around the pivot axis, and the outer shape of the light emitting tube is formed into a substantially cylindrical shape, and holds the light emitting tube, has a base, and incorporates an electronic ballast. A bulb-type fluorescent lamp equipped with a case for  In the bent glass tube, the ratio 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 the Omm range. [6] The inner diameter of the bent glass tube is set in a range of 4.0 to 7. Omm, and the tube wall load of the arc tube is set in a range of 0.07-0.l OW / cm ² . The light bulb-type fluorescent lamp according to claim 5,