JPH10116592A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a process for mixing a phosphor, and provide a fluorescent lamp of higher lamp efficiency under the application of the conventional technology without any change, regarding a compact fluorescent tamp or the like having a plurality of glass tubes jointed to each other via bridge bonding. SOLUTION: A fluorescent lamp is formed out of a plurality of glass tubes 1a and 1b of constant diameter and straight type, a joint part 4 for connecting the glass tubes 1a and 1b to each other for forming a single electric discharge path, electrodes 3a and 3b laid at both ends of the single electric discharge path and a stem 5. Regarding the fluorescent lamp so formed, the glass tubes 1a and 1b are respectively formed to have phosphor layers 2a and 2b made of simple but different types of phosphor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge connection of a plurality of glass tubes. (Bridge connection means that two glass tubes whose other ends are sealed and closed are heated by gas pressure from each glass tube and heating by a burner. To make a communication hole and a joint in both glass tubes,
The present invention relates to a high-efficiency fluorescent lamp in which different types of phosphors are applied to each glass tube, for example, in a compact fluorescent lamp and the like which are joined by means of welding and communicating.

[0002]

2. Description of the Related Art Conventionally, in a compact fluorescent lamp in which a plurality of glass tubes are joined, the fluorescent material applied to each glass tube is of the same type. It was not done.

Conventional means for mixing light emitted from different phosphors to generate light having a required spectral distribution include (1) mixing different phosphors, and (2) a plurality of phosphors coated with different phosphors. There were two typical examples of combining these lamps.

As means (1), in a lamp manufacturing process by mixing two or more kinds of different phosphors necessary for generating light having a required spectral distribution, for example, a phosphor A and a phosphor B, a phosphor A and a phosphor are used. The application amount and particle size of the body B, the amount of the binder for binding the phosphors composed of the phosphor A and the phosphor B and the phosphor and the glass tube, and the like are changed to change the conditions. A prototype of the lamp was manufactured, and a condition for high lamp efficiency was found while satisfying the required spectral distribution. Typical representative phosphors used for fluorescent lamps are listed in Table 1 ("Phosphor Handbook").
Fluorescent lamps having the required spectral distribution are produced by mixing phosphors of any composition shown in (Table 1).

<Practical phosphor for fluorescent lamp>

[0006]

[Table 1]

The lamp manufactured by means (1) is
By mixing different phosphors A and B,
Lamp efficiency is reduced by the mutual reflection and mutual absorption of light generated from each phosphor.

Conventional examples of the two-wavelength fluorescent lamp by means (1) are disclosed in Japanese Patent Application Nos. 7-242863 and 8-1747.
No. 04.

A conventional example of the means (2) is Patent Registration No. 15
No. 89169, Patent Registration No. 1602233, Patent Registration No. 1722800, JP-A-8-96760, or color coordination (color temperature production & color production system) which is a lighting device for a fluorescent lamp manufactured by Matsushita Electric Works, Ltd. is there. The configuration of these conventional examples is as shown in FIG. 5
Reference numerals 0 and 51 denote a red-emitting fluorescent lamp and its lighting device,
Reference numerals 2 and 53 denote a green-emitting fluorescent lamp and its lighting device;
Reference numerals 4 and 55 denote a blue-emitting fluorescent lamp and its lighting device,
Is a control device for controlling the lamp luminous flux ratio of 50, 52, and 54. By using these devices, the red light emitting fluorescent lamp 50, the green light emitting fluorescent lamp 52, and the blue light emitting fluorescent lamp 54 are turned on. Was mixed.
The main purpose of this conventional example is to change the light color.

[0010] Further, in color lighting in commercial facilities,
A plurality of fluorescent lamps having different emission colors are lit by providing a lighting device for each lamp.

Further, in a two-wavelength fluorescent lamp using a red light emitting phosphor and a green light emitting phosphor, a method has been adopted in which the respective phosphors are mixed and applied to the inner wall of a glass tube.

In the means (2), in order to sufficiently mix the mixed light by combining a plurality of different types of single-color fluorescent lamps and to make the mixed light look white, a milky white lamp is provided at a sufficient distance from the lamp. Lighting equipment provided with a diffuser was used.

In order to obtain light having a required spectral distribution by changing the luminous flux ratio of light emitted by different phosphors, the conventional means (1) changes the application amounts of different phosphors A and B by means of means ( In 2), the luminous flux output from the red-emitting fluorescent lamp 50, the green-emitting fluorescent lamp 52, and the blue-emitting fluorescent lamp 54 is changed by controlling the phase of the main current or by controlling the duty ratio, or changing the number of lighting lamps. I was

[0014]

However, since a mixture of a plurality of phosphors applied to a glass tube has different physical properties, the ease of application (ease of falling) between the respective phosphors is low. different. As a result, the characteristics of the mixture change with the lapse of time during the production, causing variations in the chromaticity value, which is an important item of lamp quality control.

Further, two or more different phosphors necessary for obtaining a required spectral distribution, for example, phosphor A and phosphor B
In the conventional means for mixing the phosphors, the coating amount and particle size of each of the phosphor A and the phosphor B, and the amount of the binder for bonding the phosphors to each other and the phosphor and the glass tube, are variously set. The resulting mixture was applied to the inner surface of a lamp glass tube to produce a prototype of the lamp, and a condition for high lamp efficiency was found while satisfying the required spectral distribution. Therefore, many steps and time were required.

[0016] Further, since different kinds of phosphors are applied in an overlapping manner, mutual reflection and mutual absorption are caused, and the lamp efficiency is greatly reduced. For example, a conventional three-wavelength-range daylight fluorescent lamp of 40 watts has a composition shown in Table 1 in which La ₂ O ₃ .0.2 SiO ₂ .0.9 P ₂ O ₅ : Ce ³⁺ , T
b ³⁺ green-emitting phosphor and BaMg ₂ Al ₁₆ O ₂₇ : E
A blue light emitting phosphor of u ^{2+ and} a red light emitting phosphor of Y ₂ O ₃ : Eu ³⁺ were respectively mixed at about 0.664: 0.018: 0.
A light flux ratio of 318 (this light flux ratio is a calculated value calculated based on actually measured data of a spectral distribution of a 40-watt three-wavelength light-emitting daylight fluorescent lamp).

The lamp efficiency of each lamp is 130.
3 [lm / w], 20.0 [lm / w], 73.2 [lm / w], and the lamp efficiency obtained by ideally mixing visible light from each phosphor at the above-mentioned luminous flux ratio is as follows. , 130.3 [lm / w] × 0.
664 + 20.0 [lm / w] × 0.018 + 73.2 [lm
/w]×0.318, which is about 110.2 [lm / w]. However, when three types of phosphors are mixed, the lamp efficiency is about 86 [lm / w] (nominal value of a lamp catalog). By mixing these three types of phosphors, the lamp efficiency was reduced by about 22%.

For example, in a conventional two-wavelength range fluorescent lamp of 40 watts, the composition in Table 1 is La ₂ O _3.
A green-emitting phosphor of 0.2SiO ₂ · 0.9P ₂ O ₅ : Ce ³⁺ , Tb ^{3+ and} a red-emitting phosphor of Y ₂ O ₃ : Eu ³⁺ were mixed at 0.8: 0.2, respectively. The lamps were mixed at a luminous flux ratio, and the ideally mixed lamp efficiency was 130.3 [lm / w] ×
0.8 + 73.2 [lm / w] x 0.2
18.9 [lm / w]. However, the lamp efficiency when two types of phosphors were mixed was about 10% in actual measurement.
8 [lm / w]. By mixing these two types of phosphors, the lamp efficiency was reduced by about 10%.

Further, the means for lighting a plurality of fluorescent lamps of different monochromatic emission requires a large number of fluorescent lamps, a lighting device for lighting each of the fluorescent lamps, and a control device for controlling the light mixing ratio. It was uneconomical due to the size increase.

Further, in order to sufficiently mix the mixed light by combining a plurality of different types of monochromatic fluorescent lamps and make the mixed light look white, an illuminating device provided with a milky diffusion plate at a sufficient distance from the lamp. I was using equipment. For example, the light-coordinated lighting fixture described above has a fixture depth of 250 [mm], and requires about 1.8 times more side wall material of the fixture than the depth 140 [mm] of a normal thin lighting fixture. Was. For this reason, the efficiency of the device was reduced, which was uneconomical.

Further, in order to change the luminous flux ratio of light emitted by different phosphors to obtain light having a required spectral distribution, the luminous flux output from the lamp is turned on for controlling the phase of the main current or controlling the duty ratio. Equipment and controls were required. For this reason, the efficiency of the device was reduced, which was uneconomical.

[0022]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-efficiency fluorescent lamp in which glass tubes coated with different phosphors are joined by means such as bridge connection in consideration of the above-mentioned conventional problems. It is assumed that.

To achieve the above object, a fluorescent lamp according to the present invention has means for solving the above-mentioned problems.

In the first aspect, a plurality of straight glass tubes having a constant tube diameter, and a joining portion for joining the plurality of glass tubes so as to form a single discharge path by joining the plurality of glass tubes. , In a fluorescent lamp composed of electrodes provided at both ends of the discharge path, one for each glass tube
A fluorescent lamp characterized by having a glass tube coated with a single kind of phosphor and coated with two or more different phosphors in one discharge path.

According to a second aspect of the present invention, in addition to the first aspect, in a fluorescent lamp in which two or more kinds of phosphors are applied to a plurality of glass tubes, the kind of the phosphor is rare earth phosphor or halophosphate. A fluorescent lamp characterized by using a salt phosphor.

According to a third aspect of the present invention, in addition to the first aspect, a single phosphor applied to at least one or more glass tubes has an emission peak wavelength of 530 to 580 [nm] and a half width of 30 [nm]. ] The following rare earth phosphors and other single phosphors applied to glass tubes have peak wavelengths of 600 to 6
A fluorescent lamp characterized in that it is a rare earth phosphor having a half-width of 50 [nm] or less and 30 [nm] or less.

According to a fourth aspect of the present invention, in addition to the means of the second aspect, a single phosphor applied to at least one or more glass tubes is a rare earth phosphor, and the other phosphor applied to the other glass tubes is a correlated color temperature. Is 2600-7100 Kelvin, D
A fluorescent lamp characterized in that it is a phosphor that emits light in the range of UV ± 10.

In a fifth aspect, in addition to the means of the third or fourth aspect, an A having at least one or more glass tubes is provided.
In a fluorescent lamp composed of a group, a group B, and a group C,
A single phosphor applied to the glass tube of the group B is a rare earth phosphor having an emission peak wavelength of 530 to 580 [nm] and a half width of 30 [nm] or less, and a single phosphor applied to the glass tube of the group B. Has a peak wavelength of 600 to 650 [nm] and a half width of 3
A fluorescent lamp characterized in that a rare-earth phosphor of 0 [nm] or less and a phosphor applied to a glass tube of group C are phosphors having a correlated color temperature of 2600 to 7100 Kelvin and a DUV of ± 10. It is.

In claim 6, in addition to the means of claim 1,
In a fluorescent lamp in which a plurality of straight glass tubes having a constant tube diameter are joined, the ratio of the tube diameters of the individual glass tubes is 2/3 or less.

According to a seventh aspect of the present invention, in addition to the means of the third or sixth aspect, the diameter of the glass tube is D1, D2, the relationship between the two is D1 / D2 ≦ 2/3, and the glass diameter is D1. The number of tubes is equal to or greater than the number of glass tubes having a diameter of D2. A single phosphor applied to a glass tube having a diameter of D1 is a single phosphor having an emission peak wavelength of 530 to 580 [nm] and a half width of 30.
[Nm] or less, a single phosphor applied to a glass tube having a tube diameter of D2 with a peak wavelength of 600 to 650.
A fluorescent lamp characterized in that it is a rare-earth luminous body having a half-width of 30 [nm] or less in [nm].

According to an eighth aspect of the present invention, in addition to the means of the first aspect, in a fluorescent lamp in which a plurality of straight tube-shaped glass tubes having a constant tube diameter are joined, the ratio of the lengths of the individual glass tubes is set to 0.3.
It is a fluorescent lamp characterized by being 9 or less.

In the ninth aspect, in addition to the means of the third or eighth aspect, the lengths of the plurality of glass tubes are L1 and L2, and the relationship between the two is L1 [mm] / L2 [mm] ≦ 0.9. age,
The number of glass tubes of length L2 is equal to or greater than the number of glass tubes of length L1, and a single phosphor applied to the glass tube of length L2 has an emission peak wavelength of 530 to 580 [nm] and a half width. Is a rare earth luminous body having a peak wavelength of 600 nm or less, and a single phosphor applied to a glass tube having a length of L1.
A fluorescent lamp characterized in that it is a rare-earth luminous body having a half-value width of 650 [nm] or less and 30 [nm] or less.

In a tenth aspect, in addition to the means of the sixth or eighth aspect, in a fluorescent lamp in which a plurality of straight tube glass tubes having a constant tube diameter are joined, the ratio of the tube diameters of the plurality of glass tubes is 2/3. Hereinafter, a fluorescent lamp characterized in that the length ratio is 0.9 or less.

According to an eleventh aspect of the present invention, in addition to the means of the first aspect, in a fluorescent lamp in which three or more glass tubes are arranged and joined so that the tube axis directions of the glass tubes are parallel to each other, the types of phosphors are alternately changed. A fluorescent lamp characterized by disposing a glass tube as much as possible.

In claim 12, claim 3 or 11
In addition to the above means, in a fluorescent lamp in which three or more glass tubes are arranged and joined so that the tube axis directions of the glass tubes are parallel to each other, the emission peak wavelength is 530 to 580 [nm] and the half width is 30 [nm]. ] A glass tube coated with the following rare earth illuminant and a glass tube coated with a rare earth illuminant having an emission peak wavelength of 600 to 650 [nm] and a half width of 30 [nm] or less are alternately arranged. Fluorescent lamp.

According to a thirteenth aspect, in addition to the means of the sixth aspect, in a fluorescent lamp in which three or more glass tubes having different tube diameters are arranged and joined so that the tube axes of the glass tubes are parallel to each other. A fluorescent lamp characterized by alternately arranging a glass tube having a large diameter and a glass tube having a small diameter.

In a fourteenth aspect of the present invention, in addition to the means of the first aspect, in a fluorescent lamp in which a plurality of glass tubes are arranged and joined such that the tube axes of the glass tubes are parallel to each other, an outer wall or an inner wall of all the glass tubes is provided. A light reflecting portion is provided on a surface including at least a portion of any one of the above.

According to a fifteenth aspect, in addition to the means of the third aspect, the rare earth phosphor having an emission peak wavelength of 530 to 580 [nm] and a half-value width of 30 [nm] or less is terbium, terbium / cerium, or Phosphor activated with terbium gadolinium cerium, a rare earth phosphor having an emission peak wavelength of 600 to 650 [nm] and a half width of 30 [nm] or less are manganese or europium,
Alternatively, the fluorescent lamp is characterized by using a phosphor activated with samarium or praseodymium.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides (1) combining a plurality of glass tubes having different types of applied phosphors,
(2) combining glass tubes with different tube diameters,
(3) combining glass tubes of different lengths,
(4) changing the arrangement of a plurality of glass tubes for the purpose of enabling light from various phosphors to be satisfactorily mixed, or providing a fluorescent lamp with a white appearance in a visual environment; It can be realized by combining reflectors so that light from the body can be satisfactorily mixed and the luminance in the irradiation direction is improved.

(Examples) Hereinafter, the above (1) according to the present invention will be described.
Examples (5) to (5) will be described based on the drawings.

Embodiment 1 FIGS. 1 and 2 show the embodiment (1).
This will be described with reference to FIG. In FIG. 1, a glass tube 1a, a glass tube 1b having the same dimensions as the glass tube 1a, a phosphor layer 2a, a phosphor layer 2b, an electrode 3a, an electrode 3b, a joint 4, and a glass tube 1a and a glass It comprises a tube 1b, an electrode 3a and a stem 5 for fixing the electrode 3b in an airtight manner.

For example, in the phosphor layer 2a, the composition in (Table 1)
Is La_TwoO_Three・ 0.2SiO_Two・ 0.9P_TwoO _Five: Ce³⁺, Tb³⁺
(Hereinafter referred to as LAP) green-emitting phosphor
In layer 2b, Y_TwoO_Three: Eu³⁺(Hereinafter referred to as YOX) red
Two-wavelength fluorescent lamp by using color-emitting phosphor
Can be configured.

This two-wavelength fluorescent lamp is one in which LAP and YOX phosphors are separately applied to two glass tubes 1a and 1b, and the lamp efficiency is 130.3 [lm / m].
w] × 0.5 + 73.2 [lm / w] × 0.5,
101.75 [lm / w]. If this is implemented by means of mixing conventional phosphors, the lamp efficiency will be about 90 [lm / w] based on measured data. That is, the present invention can increase the efficiency by about 10%.

The two-wavelength fluorescent lamp of this embodiment is
The luminous flux ratio between AP and YOX is 64:36 (130.3 [lm /
w] × 0.5: 73.2 [lm / w] × 0.5 converted to percentage (%)), DUV is about 10, average color rendering index is about 82, and whiteness is also good. High and can be used as indoor illumination light. For example, when the two-wavelength fluorescent lamp according to the present embodiment is used for general illumination, it is preferable to combine the fluorescent lamp with an appliance that does not allow the lamp to be directly seen as shown in FIG. FIG. 2 shows architectural lighting which is one of the indirect lighting fixtures. This is because the lamp 6 according to the present embodiment mixes light and reflects light from the ceiling surface 7.
This is an example in which the shielding part 9 for hiding the lamp 6 is fixed to the wall surface 10. This makes it possible to realize a brighter environment than before, without making the human eye 11 notice the light color difference of the lamp 6.

When a part of the glass tube is exposed to the human eye, a phosphor that emits white light may be applied only to the exposed glass tube. Fluorescent lamps used for general illumination in JIS Z 9112-1990 have a correlated color temperature of 2
600-7100 Kelvin, and DUV ± 10,
It is in the range near the blackbody locus on the chromaticity diagram. This range is a so-called white light chromaticity range, and a phosphor emitting the chromaticity may be applied to a glass tube exposed to human eyes. An embodiment relating to the arrangement of a glass tube coated with a phosphor emitting white light will be described in a fourth embodiment separately.

(Embodiment 2) The embodiment (2) will be described with reference to FIGS. Conventionally, compact fluorescent lamps have various tube diameters from 12.5 [mm] to 22 [mm]. FIG. 3 shows the relationship between the lamp tube diameter and the luminous efficiency of a fluorescent lamp used for a backlight of a television, a personal computer or the like.

As can be seen from FIG. 3, the luminous efficiency of the lamp increases as the tube diameter decreases. That is, by making the diameters of the glass tubes different, the luminous flux ratio of the light emitted from the phosphor applied to each glass tube can be arbitrarily controlled, and an arbitrary spectral distribution can be obtained. FIG. 4 of the present embodiment shows thin glass tubes 12 a and 12 b and a thick glass tube 13.
a, 13b, thin glass tubes 12a, 12b
A phosphor layer 14 having good luminous efficiency, and a thick glass tube 13
Reference numerals a and 13b denote fluorescent lamps in which other types of phosphor layers 15 are combined. For example, a thin glass tube 12a,
12b is coated with a phosphor having good luminous efficiency such as LAP,
By coating the thick glass tubes 13a and 13b with a phosphor having relatively low luminous efficiency such as YOX, a two-wavelength fluorescent lamp with higher luminous efficiency can be realized.

Further, since a thin glass tube can be arranged by utilizing a space between the arranged thick glass tubes,
High power lamps can be downsized. For example, FIG.
It is sectional drawing which cut | disconnected the Example of the small fluorescent lamp of high output by the surface perpendicular | vertical to a tube axis. Glass tubes 16a and 16b of the same dimensions having a tube diameter of D3 are arranged with their tube axes parallel to each other, and a cylinder 17 having a radius D3 inscribed at two points with the glass tubes 16a and 16b, and a glass tube 16a and 16b. In order to circumscribe at three points, straight glass tubes 18a and 18b having the same diameter D4 are arranged. The luminous flux of the fluorescent lamp of this embodiment is about four times or more the luminous flux of the fluorescent lamp using only the cylinder 17 as a glass tube, and the luminous flux ratio can be improved about four times or more with the same volume. At this time, the ratio between the tube diameters D3 and D4 of the glass tubes 16a and 18a is 3: 2.

(Embodiment 3) An embodiment (3) will be described with reference to FIGS. Generally, if the tube diameter is the same, the length of the glass tube and the luminous flux are almost proportional. That is, by changing the length of the glass tubes, the luminous flux ratio of the light emitted from the phosphor applied to each glass tube can be arbitrarily controlled, and an arbitrary spectral distribution can be obtained in the entire fluorescent lamp. In addition, lamps of various shapes and sizes can be made. For example, FIGS. 6 and 7 show examples in which glass tubes having different lengths are combined. FIG. 6 shows a fluorescent lamp composed of a straight tubular glass tube, and FIG. 7 shows a fluorescent lamp composed of a straight tubular and annular glass tube. FIG. 8 shows an example of a two-wavelength fluorescent lamp using this means.

Referring to FIG. 8, a two-wavelength fluorescent lamp according to the present embodiment includes a glass tube 19a and a glass tube 19b having the same length.
And a fluorescent layer 20 applied thereto, glass tubes 21a and 21b having the same length, a fluorescent layer 22, an electrode 23a and an electrode 23b applied thereto, and a stem 24 for fixing them. The ratio of the length of the glass tube 21a to the length of the glass tube 21a is 7: 3.
P, a lamp in which the phosphor layer 22 is YOX. Thereby, the LAP and YOX of the two-wavelength fluorescent lamp of the present embodiment are obtained.
Is about 8: 2, and the ideal lamp efficiency is 118.9 [lm / w] in calculated value, which is about 10 [lm / w] as compared with the actual measured value obtained by mixing the phosphor. The efficiency is improved. The length of the glass tube of the conventional compact fluorescent lamp is 90 [mm], 100 [mm], 110 [mm], 1 [mm].
30 [mm], 140 [mm], 180 [mm], 220 [m
m] to 860 [mm]. Considering the use of a conventional glass tube, the length ratio when two types of glass tubes having different lengths are combined is in the range of about 0.9 to 0.1.

Embodiment 4 FIGS. 9 to 1 show the embodiment (4).
9 will be described. FIG. 9 shows an example in which glass tubes 26a and 26b having a phosphor layer 25 and glass tubes 28a and 28b having a phosphor layer 27 are arranged alternately. With this arrangement, the light emitted from the phosphor layer 25 and the light emitted from the phosphor layer 27 can be uniformly mixed.

The embodiment shown in FIGS. 10 to 15 is a combination of a glass tube coated with a phosphor emitting white light (a phosphor emitting a light having a correlated color temperature of 2600 to 7100 Kelvin and a DUV of ± 10). Thus, a white feeling is added to the lamp while obtaining a high lamp efficiency. FIG. 10, FIG.
1 is both ends or one end, FIG. 12 is the innermost part, FIG. 13 is a cross section, and in a fluorescent lamp in which a glass tube is arranged in a ring shape, one continuous surface, FIG. 14 shows a ring-shaped outermost part, and FIG. Glass tubes 29 to 34 coated with a phosphor emitting white light were disposed at the innermost part.

FIG. 16 is a longitudinal sectional view of a general lighting fixture to which the lamp of the embodiment of FIG. 10 is attached. Reflecting plates 38a, 3a are provided on the entire upper part and the lower central part of a lamp 37 composed of a white light emitting glass tube 35 and monochromatic light emitting glass tubes 36a, 36b.
8b is a general lighting fixture provided with 8b. by this,
A brighter lighting environment can be realized while maintaining a white feeling. FIG. 17 is a longitudinal sectional view of a general lighting fixture to which the lamp of the embodiment of FIG. 12 is attached. FIG. 18 is a longitudinal sectional view of a general lighting fixture to which the lamp of the embodiment of FIG. 14 is attached. FIG. 19 is a longitudinal sectional view of a general lighting fixture to which the lamp of the embodiment of FIG. 15 is attached. According to the embodiment shown in FIGS. 17 to 19, it is possible to realize a brighter lighting environment while ensuring a white appearance.

(Embodiment 5) An embodiment (5) will be described with reference to FIG. In this embodiment, a glass tube 46a having a phosphor layer 45a and a glass tube 46 having a phosphor layer 45b are provided.
b, reflection portions 47a and 47b formed by aluminum evaporation or the like on the outer surfaces of the glass tube 46a and the glass tube 46b. As a result, the light 48a emitted from the phosphor layer 45a and the light 48b emitted from the phosphor layer 45b can be sufficiently mixed, and the brightness of the lamp on the opposite side of the reflectors 47a and 47b can be increased. In the embodiment shown in FIG. 21, four glass tubes 49a are arranged in a ring shape with their tube axes parallel to each other.
It is sectional drawing of the fluorescent lamp provided with 9b. With such a configuration, it is possible to increase the luminance of the surface in the outward direction of the fluorescent lamp.

As described above, according to the embodiment of the present invention, a plurality of tubular glass tubes are joined to each other so as to form one discharge path by joining the plurality of glass tubes. And at least two electrodes provided only at both ends of the discharge path, each of which is coated with one kind of single phosphor on one glass tube,
The phosphor of one glass tube is different from the phosphor of another glass tube, eliminating the need to mix the phosphor and facilitating fluorescent lamps with higher lamp efficiency while using the conventional manufacturing technology. Can be realized.

Further, since the electrodes are arranged and used so that all the sealed spaces formed by the joints and the glass tube are used as discharge paths, the efficiency is high in this respect as well.

[0057]

As is apparent from the above description, the present invention provides a phosphor which is applied to a plurality of glass tubes as a single body and is composed of a plurality of glass tubes of different types. A fluorescent lamp having a higher lamp efficiency can be formed while saving the trouble of mixing the conventional techniques and using the conventional manufacturing technique as it is.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a fluorescent lamp composed of a plurality of glass tubes coated with different types of phosphors;

FIG. 2 is a configuration diagram showing a lighting apparatus using the fluorescent lamp of the embodiment of FIG. 1;

FIG. 3 is a diagram showing the relationship between the inner diameter of the lamp tube and the luminous efficiency.

FIG. 4 is a configuration diagram showing a fluorescent lamp composed of glass tubes having different tube diameters.

FIG. 5 is a cross-sectional view of a fluorescent lamp composed of a glass tube having a tube diameter ratio of 2/3.

FIG. 6 is a configuration diagram showing a fluorescent lamp composed of straight tubular glass tubes having different lengths.

FIG. 7 is a configuration diagram showing a fluorescent lamp composed of straight and annular glass tubes having different lengths;

FIG. 8 is a configuration diagram showing a two-wavelength fluorescent lamp composed of glass tubes having different lengths.

FIG. 9 is a configuration diagram showing a fluorescent lamp in which glass tubes of different phosphor layers are alternately arranged.

FIG. 10 is a block diagram showing a fluorescent lamp that emits white light from glass tubes at both ends to enhance whiteness.

FIG. 11 is a block diagram showing a fluorescent lamp that emits white light from a glass tube at one end to enhance whiteness.

FIG. 12 is a block diagram showing a fluorescent lamp that emits white light from an internal glass tube to enhance whiteness.

FIG. 13 is a configuration diagram showing a fluorescent lamp that emits white light from a part of continuous glass tubes.

FIG. 14 is a configuration diagram showing a fluorescent lamp in which the outermost annular glass tube emits white light.

FIG. 15 is a configuration diagram showing a fluorescent lamp in which the innermost annular glass tube emits white light.

16 is a longitudinal sectional view of a lighting fixture using the fluorescent lamp of the embodiment of FIG.

17 is a longitudinal sectional view of a lighting fixture using the fluorescent lamp of the embodiment in FIG.

18 is a longitudinal sectional view of a lighting apparatus using the fluorescent lamp of the embodiment in FIG.

19 is a longitudinal sectional view of a lighting apparatus using the fluorescent lamp of the embodiment in FIG.

FIG. 20 is a sectional view of a fluorescent lamp in which a reflecting portion is provided in the fluorescent lamp of the present invention.

FIG. 21 is a cross-sectional view of a fluorescent lamp in which a reflecting portion is provided on a surface where glass tubes arranged in a ring shape face each other.

FIG. 22 is a configuration diagram showing a conventional lighting device.

[Explanation of symbols]

 1a Glass tube 1b Glass tube 2a Phosphor layer 2b Phosphor layer 3a Electrode 3b Electrode 4 Joint 5 Stem 6 Lamp 7 Ceiling surface 8 Reflector 9 Shield 10 Wall 11A 12a Glass tube 12b Glass tube 13a Glass tube 13b Glass tube 14 Phosphor Layer 15 Phosphor Layer 16a Glass Tube 16b Glass Tube 17 Cylinder 18a Glass Tube 18b Glass Tube 19a Glass Tube 19b Glass Tube 20 Phosphor Layer 21a Glass Tube 21b Glass Tube 22 Phosphor Layer 23a Electrode 23b Electrode 24 Stem 25 Fluorescence Body layer 26a Glass tube 26b Glass tube 27 Phosphor layer 28a Glass tube 28b Glass tube 29 Glass tube coated with white-emitting phosphor 30 Glass tube coated with white-emitting phosphor 31 Glass coated with white-emitting phosphor Tube 32 Glass coated with white light emitting phosphor Tube 33 Glass tube coated with white light emitting phosphor 34 Glass tube coated with white light emitting phosphor 35 Glass tube coated with white light emitting phosphor 36a Glass tube coated with single light emitting phosphor 36b Single color light emitting fluorescence Glass tube 37 coated with body 37 Fluorescent lamp 38a Reflector 38b Reflector 39 Glass tube coated with white light-emitting phosphor 40 Reflector 41 Glass tube coated with white light-emitting phosphor 42 Reflector 43 White light-emitting phosphor Coated glass tube 44 Reflector 45a Phosphor layer 45b Phosphor layer 46a Glass tube 46b Glass tube 47a Reflector 47b Reflector 48a Light 48b Light 49 Red fluorescent lamp

Claims (16)

[Claims] A plurality of straight glass tubes having a constant tube diameter;
A joining portion that joins the plurality of glass tubes so as to join the plurality of glass tubes to form one discharge path;
In a fluorescent lamp constituted by electrodes provided at both ends of the discharge path, one kind of a single fluorescent substance is applied to one glass tube, and two or more different fluorescent substances are applied to one discharge path. A fluorescent lamp, comprising: a glass tube. 2. A fluorescent lamp in which two or more kinds of phosphors are applied to a plurality of glass tubes, wherein the kind of the phosphor is a rare earth phosphor or a halophosphate phosphor. Item 7. The fluorescent lamp according to Item 1. 3. A single phosphor applied to at least one or more glass tubes is coated with an emission peak wavelength of 530 to 580 [n
m], a rare-earth phosphor having a half-value width of 30 [nm] or less, or another single phosphor applied to a glass tube having a peak wavelength of 6 nm.
The fluorescent lamp according to claim 1, wherein the rare-earth phosphor has a half-value width of 30 [nm] or less at 00 to 650 [nm]. 4. A single phosphor applied to at least one or more glass tubes is a rare earth phosphor, and other phosphors applied to other glass tubes have a correlated color temperature of 2600 to 7100 Kelvin and a DUV of ± 10. 3. The fluorescent lamp according to claim 2, wherein the fluorescent lamp emits light in a range. 5. An A having at least one glass tube
In a fluorescent lamp composed of a group, a group B, and a group C,
A single phosphor applied to the glass tube of the group B is a rare earth phosphor having an emission peak wavelength of 530 to 580 [nm] and a half width of 30 [nm] or less, and a single phosphor applied to the glass tube of the group B. Has a peak wavelength of 600 to 650 [nm] and a half width of 3
The rare-earth phosphor of 0 [nm] or less, and the phosphor applied to the glass tube of the group C is a phosphor that emits light with a correlated color temperature of 2600 to 7100 Kelvin and a DUV of ± 10. The fluorescent lamp according to 3 or 4. 6. The fluorescent lamp according to claim 1, wherein a ratio of tube diameters of individual glass tubes is 2/3 or less in a fluorescent lamp in which a plurality of straight tube glass tubes having a constant tube diameter are joined. Fluorescent lamp. 7. The glass tube diameters are D1 and D2, and the relationship between them is D1 / D2 ≦ 2/3, and the number of glass tubes having a diameter of D1 is the number of glass tubes having a diameter of D2. And a single phosphor applied to a glass tube having a tube diameter of D1 has an emission peak wavelength of 530 to 580 [nm] and a half width of 30.
[Nm] or less, a single phosphor applied to a glass tube having a tube diameter of D2 with a peak wavelength of 600 to 650.
The fluorescent lamp according to claim 3, wherein the fluorescent lamp is a rare-earth luminous body having a half-width of 30 nm or less in [nm]. 8. A fluorescent lamp in which a plurality of straight glass tubes having a constant tube diameter are joined, wherein the ratio of the lengths of the individual glass tubes is 0.9 or less. Fluorescent lamp. 9. A plurality of glass tubes having lengths L1 and L2,
The relationship between the two is L1 [mm] / L2 [mm] ≦ 0.9, the number of glass tubes of length L2 is equal to or greater than the number of glass tubes of length L1, and applied to the glass tube of length L2. A single phosphor having an emission peak wavelength of 530 to 580 [nm].
Rare earth luminous body having a half width of 30 [nm] or less, length L1
A single phosphor applied to a glass tube with a peak wavelength of 60
The fluorescent lamp according to claim 3, wherein the fluorescent lamp is a rare-earth illuminant having a half-value width of 30 [nm] or less at 0 to 650 [nm]. 10. A fluorescent lamp in which a plurality of straight tube glass tubes having a constant tube diameter are joined, wherein the ratio of the plurality of glass tubes is 2/3 or less and the length ratio is 0.9 or less. The fluorescent lamp according to claim 6, wherein the fluorescent lamp is provided. 11. A fluorescent lamp in which three or more glass tubes are arranged and joined such that the tube axes of the glass tubes are parallel to each other, wherein the glass tubes are arranged so that the types of phosphors are alternated. The fluorescent lamp according to claim 1, wherein 12. A fluorescent lamp in which three or more glass tubes are arranged and joined so that the tube axes of the glass tubes are parallel to each other, and have an emission peak wavelength of 530 to 580 [nm] and a half width of 30 [nm]. ] A glass tube coated with the following rare earth illuminant and a glass tube coated with a rare earth illuminant having an emission peak wavelength of 600 to 650 [nm] and a half width of 30 [nm] or less are alternately arranged. The fluorescent lamp according to claim 3 or 11, wherein: 13. A fluorescent lamp in which three or more glass tubes having different tube diameters are arranged and joined so that the tube axis directions of the glass tubes become parallel to each other. 7. The fluorescent lamp according to claim 6, wherein thin glass tubes are alternately arranged. 14. In a fluorescent lamp in which a plurality of glass tubes are arranged and joined such that the tube axes of the glass tubes are parallel to each other, light is applied to a surface including at least a part of either the outer wall or the inner wall of all the glass tubes. 2. The fluorescent lamp according to claim 1, further comprising a portion that reflects light. 15. An emission peak wavelength of 530 to 580 [n
m] and a half-width of 30 [nm] or less is a rare earth phosphor activated with terbium, terbium / cerium, or terbium / gadolinium / cerium;
The emission peak wavelength is 600 to 650 [nm] and the half width is 3
The rare-earth phosphor of 0 [nm] or less is manganese or
4. The fluorescent lamp according to claim 3, wherein the fluorescent lamp is a phosphor activated by europium, samarium, or praseodymium. 16. A plurality of glass tubes, a joining portion for joining the plurality of glass tubes so as to form one discharge passage by joining the plurality of glass tubes, and two joints provided only at both ends of the discharge passage. A fluorescent lamp comprising two electrodes, one kind of a single phosphor applied to each glass tube, and the phosphor of at least one glass tube is different from the phosphor of another glass tube. .