KR100977629B1 - Metal halide lamp having high color rendering properties - Google Patents

Abstract

PURPOSE: A metal halide lamp having high color rendering properties is provided to reduce a possibility of a bulb by mounting a shroud around a CDM lamp. CONSTITUTION: An outer bulb(10) is formed with a transparent quartz material. The outer bulb comprises a first and second tubes(11,12) which are extended to be opposite to each. The first tube is supported by both ends of a supporting frame(60). The support stand(50) is connected to the supporting frame in order to support an arc tube(20). A base(80) is installed in the second tube of the outer bulb. The base supports a lead line(30) supplying electric potential to an electrode of the arc tube.

Description

High color rendering metal halide lamp {METAL HALIDE LAMP HAVING HIGH COLOR RENDERING PROPERTIES}

The present invention relates to a high color rendering metal halide lamp, and more specifically, a light emitting tube which emits light by being supplied with power and is located inside the outer opening forming the exterior of the lamp and receives the power, and the lead wire and the light emitting tube supplying power to the light emitting tube. In the ceramic high-pressure discharge metal halide lamp comprising a shroud surrounding the perimeter of the ceramic high-voltage discharge metal halide lamp, characterized in that it exhibits high color rendering by applying a fluorescent material to the inner wall of the shroud.

In recent years, environmentally friendly LED lighting has come into the spotlight due to easy post-processing when power consumption is not high and end of life, but on the other hand, the demand for metal halide lamps with high luminous flux due to its high luminous flux and natural color has been applied to the emergence of LED lighting. Nevertheless, it continues to be maintained. In particular, the lighting used as an outdoor light source such as a street lamp or a security lamp should have a long life, abundant light and excellent color rendering. The solar street light using the LED light has a problem that it is not suitable for the above uses because of its low illuminance and brightness. The demand for metal halide lamps is expected to remain active.

Metal halide lamps are a high-pressure discharge lamp developed for the purpose of improving the efficiency and color rendering of a conventional mercury lamp. Metal halide lamps combine metal elements such as scandium, thorium, and sodium with halogen elements in addition to mercury and argon gas in the light tube, compared to conventional mercury lamps that emit mercury and argon gas in a light tube. It is encapsulated with a metal halide compound.

The light emission principle of the metal halide lamp is as follows. When current flows through the light emitting tube, an electric field is formed between the main electrode and the auxiliary electrode to emit electrons, and a glow discharge is locally generated between the main electrode and the auxiliary electrode to ionize the argon gas, and the argon discharge is diffused between the main electrodes. do. Heat generated by the argon discharge evaporates mercury, and the vaporized mercury vapor is moved to the center of the light emitting tube so that the light emission intensity of the mercury increases as the argon discharge proceeds to the mercury discharge. As the temperature of the light tube increases, the halogen compound encapsulated there evaporates and moves to the center of the light tube, where it dissociates into a metal atom and a halogen atom, whereby electrons emitted from the electrode collide with the metal atoms instantaneously, Light having a wavelength corresponding to that energy is excited or ionized by electrons in the stable orbit, and electrons or free electrons that escape from the vacant ionized metal atoms enter or stabilize, or electrons of the excited metal atoms are transferred. Will radiate.

Recently, a ceramic high pressure discharge lamp (CDM lighting) has been developed in which the light tube of the metal halide lamp made of quartz material is replaced with ceramic, so that the heat load is less than that of the general metal halide lamp, and there is no damage to the product due to heat, and the life is long. It has excellent color rendering and is spotlighted as an illumination that can emit the most luminous flux per unit power.

In particular, research to implement color rendering close to sunlight for more effective use of CDM lighting has been actively conducted, conventionally has been disclosed a technique for applying a fluorescent material containing a fluorescent material to the outside. However, grooves and the like are formed in the outer circumference of the lamp to facilitate fixing of the support frame of the light emitting tube, and thus, the surface thereof is very irregular, so that even application of the fluorescent material is difficult.

On the other hand, the light emitting tube may cause damage such as crack generation, and UV is generated, and the shroud of quartz material may be used for the purpose of reducing the explosion probability of the bulb when the light emitting tube is broken and blocking UV. There is no prior art to improve the color rendering of CDM illumination by applying a fluorescent material to the shroud.

The present invention relates to a ceramic high-pressure discharge metal halide lamp devised in order to implement the excellent color rendering, and more specifically, the outer constituting the appearance of the lamp, the light emitting tube which is located inside the outer sphere and receives power and emits light; A ceramic high voltage discharge metal halide lamp comprising a lead wire for supplying power to the light emitting tube and a shroud surrounding the light emitting tube, wherein the inner wall of the shroud is coated with a fluorescent material. It is an object to provide a lamp.

The object of the present invention is an outer sphere forming the appearance of the lamp, a light emitting tube made of a ceramic material which is located in the outer sphere and receives power to emit light, a lead wire for supplying power to the light emitting tube and a shroud surrounding the light emitting tube In the ceramic high-pressure discharge metal halide lamp comprising a, the inner wall of the shroud is achieved by providing a ceramic high-pressure discharge metal halide lamp, characterized in that the fluorescent material is applied.

Here, the fluorescent material applied to the inner wall of the shroud may include a red phosphor.

Here, the fluorescent material applied to the inner wall of the shroud is a red phosphor Y ₂ O ₂ S: Eu + Fe ₂ O ₃ , (Zn, Sr) ₃ (PO ₄ ) ₂ : Mn, (Sr, Mg) ₃ (PO ₄ ) ₂ : Sn (II), Y ₂ O ₃ : Eu, Y ₂ O ₃ : Eu (III), YbO ₃ : Eu (III), Mg ₄ (F) GeO ₆ : Mn, Mg ₄ (F) ( _{Ge, Sn) O 6: Mn} , Y (P, V) O 4: Eu, YVO 4: Eu, Y 2 O 2 S: Eu, 3.5MgO · 0.5MgF 2 · GeO 2: Mn, Y 2 O 2 S : Tb, Mg ₅ As ₂ O ₁₁ It may include one or more red phosphors selected from the group consisting of Mn, Gd ₂ O ₂ S: Eu, Zn (0.4) Cd (0.6) S: Ag (HSr).

Here, the lead wire for supplying power to the light emitting tube may include one or more selected from the group consisting of W, Mo, Nb as a component.

Here, the inner material of the light emitting tube includes Ar, Hg, a metal halogen compound, the metal halogen compound is selected from the group consisting of Na, Tl, In, Sc, Se, Th, Dy, Sn, Tm, Ho It may be one or more halogen compounds.

Here, the shroud may be made of a quartz material.

Here, the ceramic high-pressure discharge metal halide lamp may further include a support frame for supporting the shroud in the outer opening.

Hereinafter, the present invention will be described in more detail.

The present invention provides a ceramic high-pressure discharge comprising an outer bulb forming an exterior of a lamp, a light emitting tube positioned inside the outer bulb and emitting power, a lead wire for supplying power to the light emitting tube, and a shroud surrounding the light emitting tube. In the metal halide lamp, the inner wall of the shroud provides a ceramic high-pressure discharge metal halide lamp, characterized in that the fluorescent material is applied. It is common to use borosilicate glass or quartz glass for the outer sphere, and borosilicate glass or quartz glass is preferable because it is resistant to thermal shock because the coefficient of thermal expansion does not increase even at a temperature up to the melting point and the viscosity is also low.

In the present invention, the light emitting tube is preferably made of a ceramic material so as not to damage the product due to the heat load is low.

In the present invention, the fluorescent material preferably comprises a red phosphor, in particular Y ₂ O ₂ S: Eu + Fe ₂ O ₃ , (Zn, Sr) ₃ (PO ₄ ) ₂ : Mn, (Sr, Mg) ₃ (PO ₄ ) ₂ : Sn (II), Y ₂ O ₃ : Eu, Y ₂ O ₃ : Eu (III), YbO ₃ : Eu (III), Mg ₄ (F) GeO ₆ : Mn, Mg ₄ ( F) (Ge, Sn) O 6: Mn, Y (P, V) O 4: Eu, YVO 4: Eu, Y 2 O 2 S: Eu, 3.5MgO · 0.5MgF 2 · GeO 2: Mn, Y 2 O ₂ S: Tb, Mg ₅ As ₂ O ₁₁ : Mn, Gd ₂ O ₂ S: Eu, Zn (0.4) Cd (0.6) S: Ag (HSr) comprising at least one red phosphor selected from the group consisting of It is preferable. When the red phosphor is applied, the Ra value indicating the color rendering property is increased (R1 to R15) as a whole. In particular, it contributes to the improvement of the average color rendering index (R1 to R8).

Here, the method of applying the phosphor to the shroud is as follows. First, select a red phosphor suitable for the desired characteristics, and mix it with a binder and a binder to make a slurry, and then drip the quartz shroud into the slurry containing the red phosphor, take it out, and dry at room temperature for 10 to 20 minutes, and then dry. When the shroud is put into a baking machine and fired at 500 to 600 ° C. within 30 minutes, the shroud coated with the red phosphor of the present invention is completed.

The lead wire for supplying power to the light emitting tube may include at least one selected from the group consisting of W, Mo, and Nb as a component. Electromagnetic materials may be added to the electrode material, which makes it easy to start the lamp, lowers the sustain voltage of the discharge, and determines important characteristics such as the luminous flux maintenance rate and the lifetime of the lamp. As a predetermined potential is applied to the lead wires consisting of W, Mo, and Nb, an arc discharge occurs in the light emitting tube to be turned on.

In the present invention, the inner material of the light emitting tube includes Ar, Hg, a metal halide compound, the metal halide is Na, Tl, In, Sc, Se, Th, Dy, Sn, Tm, Ho from the group consisting of One or more halogen compounds selected may be classified as follows according to their type.

The Na-Tl-In system is a lamp combining strong spectra of Na, Tl and In. Although the efficiency is good, the color rendering property is slightly lowered to about Ra = 70, but the color rendering property appears to be close to Ra = 90 according to the present invention.

The Sc-Na system is a lamp combining a large number of weak spectra of Sc and a strong spectra of Na. The Sc-Na system is highly efficient, but the color rendering property is slightly lowered to about Ra = 70, but the color rendering property appears to be closer to Ra = 90 according to the present invention.

Dy-Tl-In (or Na-based) is a lamp that combines many weak spectra of Dy with strong spectra of Tl and In (or Na), and has good color rendering (Ra = 80 to 90). The color rendering of information can be realized.

Sn type is a lamp using continuous spectrum by tin halide molecule, but its efficiency is low, but the color rendering property is very good as Ra = 90 ~ 95 and it is close to natural light.

In the present invention, the shroud may be made of a quartz material. The fluorescent material is coated on the inner wall of the shroud, and contributes to UV blocking and color rendering.

In the present invention, the ceramic high-pressure discharge metal halide lamp further includes a support frame to support the shroud in the outer opening.

According to the present invention, by mounting the shroud around the light emitting tube of the CDM lighting, the explosion possibility of the bulb when the light emitting tube is broken, as well as UV blocking effect, heat condensation improves the color rendering properties, the fluorescent applied to the inner wall of the shroud The color has the effect of further improving the color rendering. In addition, since the process of applying the fluorescent material to the inner wall of the shroud is relatively simple, the manufacturing is easy, and thus the cost is reduced.

1 is a schematic diagram showing a ceramic high-pressure discharge metal halide lamp manufactured by Example 1 of the present invention.
2 is a graph evaluating the color rendering index of the ceramic high-pressure discharge metal halide lamp of the present invention according to Examples 2 to 4. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

Prior to this, the terms or words used in this specification and claims should not be limited to the usual or dictionary meanings, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Example  1: Ceramic high pressure discharge metal according to the present invention Halide  Manufacture of lamps

1 shows a ceramic high-pressure discharge metal halide lamp manufactured by Example 1 of the present invention.

Ceramic high-pressure discharge metal halide lamp according to the present invention is made of a transparent quartz material and the outer opening 10 is provided with a tube portion 11, 12 having a predetermined length inward or outward in a direction facing each other, and the tube portion 11 The support frame 60 is supported at both ends, the support frame 50 is connected to the support frame 60 fixed to support the light emitting tube 20, and installed on one side tube portion 12 of the outer opening 10 And a base 80 for supporting the lead wire 30 for applying a potential to the electrode of the light emitting tube 20, a shroud 40 supported and fixed by the support frame 60, and a getter for the purpose of removing impurities. It is comprised with 70.

Meanwhile, the shroud mounted on the ceramic high-pressure discharge metal halide lamp according to the present invention mixes Y ₂ O ₃ : Eu with a binder and a binder to make a slurry, and drips the quartz shroud into the slurry containing the phosphor and then takes it out. After drying at room temperature for 20 minutes, the shroud dried at room temperature was put into a baking machine and prepared by firing at 500 ° C for 10 minutes. The shroud according to the present invention may be preferably formed in a cylindrical shape and open in the vertical direction.

Example  2: Ceramic high voltage discharge metal without fluorescent shroud Halide  Color rendering of the lamp and Color rendering index  evaluation

The R1-R15 values of the ceramic high-pressure discharge metal halide lamps without a shroud were measured and shown in a graph (FIG. 2).

The color rendering results (R1 to R15) were as shown in Table 1 below, and the color rendering index (average of R1 to R8) was 77.7.

R1 R2 R3 R4 R5 R6 R7 R8 79 86 84 83 79 83 80 47 R9 R10 R11 R12 R13 R14 R15 Ra -61 59 83 69 83 91 60 77.7

Example  3: fluorescent material Not applied  Not plain Shroud  Ceramic high pressure discharge metal Halide  Color rendering of the lamp and Color rendering index  evaluation

R1 to R15 values of the ceramic high-pressure discharge metal halide lamps equipped with the general shroud to which the fluorescent material was not applied were measured and shown in a graph (FIG. 2).

The color rendering results (R1 to R15) were as shown in Table 2 below, and the color rendering index (average of R1 to R8) was 85.5.

R1 R2 R3 R4 R5 R6 R7 R8 86 92 93 89 87 91 85 60 R9 R10 R11 R12 R13 R14 R15 Ra -16 76 91 83 89 96 72 85.5

Example  4: fluorescent material Applied Shroud  Ceramic high pressure discharge metal which Color rendering measurement of the ride lamp and Color rendering index  evaluation

Y ₂ O ₃ : The R 1 to R 15 values of the ceramic high-pressure discharge metal halide lamps equipped with a shroud coated with Eu were measured and shown in a graph (FIG. 2).

The color rendering results (R1 to R15) were as shown in Table 3 below, and the color rendering index (average of R1 to R8) was found to be very high at 88.9.

R1 R2 R3 R4 R5 R6 R7 R8 89 95 97 92 90 95 87 66 R9 R10 R11 R12 R13 R14 R15 Ra 5 85 94 89 92 98 77 88.9

According to the embodiment as described above, it was found that due to the fluorescent material applied to the inner wall of the shroud, the color rendering property is greatly improved.

Claims (6)

Exterior forming the appearance of the lamp;
A light emitting tube made of a ceramic material which is located inside the outer opening and receives power;
A lead wire for supplying power to the light emitting tube; And
A shroud surrounding the light emitting tube;
In the ceramic high pressure discharge metal halide lamp comprising:
The inner wall of the shroud is a ceramic high-pressure discharge metal halide lamp, characterized in that the fluorescent material is coated with a red phosphor. delete The method of claim 1,
The red phosphor coated on the inner wall of the shroud is Y ₂ O ₂ S: Eu + Fe ₂ O ₃ , (Zn, Sr) ₃ (PO ₄ ) ₂ : Mn, (Sr, Mg) ₃ (PO ₄ ) ₂ : Sn ( II), Y ₂ O ₃ : Eu, Y ₂ O ₃ : Eu (III), YbO ₃ : Eu (III), Mg ₄ (F) GeO ₆ : Mn, Mg ₄ (F) (Ge, Sn) O ₆ : Mn, Y (P, V ) O 4: Eu, YVO 4: Eu, Y 2 O 2 S: Eu, 3.5MgO · 0.5MgF 2 · GeO 2: Mn, Y 2 O 2 S: Tb, Mg 5 As ₂ O ₁₁ : Mn, Gd ₂ O ₂ S: Eu, Zn (0.4) Cd (0.6) S: Ag (HSr) Ceramic high-pressure discharge metal halides comprising at least one red phosphor selected from the group consisting of lamp. delete The method of claim 1,
The lead wire for supplying power to the light emitting tube is a ceramic high-pressure discharge metal halide lamp, characterized in that it comprises at least one member selected from the group consisting of W, Mo, Nb. 6. The method of claim 5,
The inner material of the light emitting tube may include Ar, Hg, and a metal halogen compound, and the metal halogen compound may be at least one selected from the group consisting of Na, Tl, In, Sc, Se, Th, Dy, Sn, Tm, and Ho. Ceramic high pressure discharge metal halide lamp, characterized in that the halogen compound.

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