JP2008300082A - High-pressure discharge lamp and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage of creatures not needing ultraviolet rays or part of blue-light colors, prevent degradation of paper, clothes or the like, and reduce attraction of flying insects. <P>SOLUTION: In case a film thickness of an ultraviolet-cut coating at a center part of an outer-tube is standard, a film thickness at an area I from nearly 30 degrees at a bulb-top side to nearly 30 degrees at a bulb-sealing side is a first film thickness in the vicinity of the standard, a film thickness of at an area II from nearly 30 degrees to nearly 60 degrees at the bulb-top side is a second film thickness larger than the maximum value of the first film thickness, and a film thickness at an area III from nearly 30 degrees to nearly 60 degrees at the bulb-sealing side is a third film thickness thinnest among them. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-pressure discharge lamp having an ultraviolet-cut coating that cuts off ultraviolet rays that cause harmful or flying insects and promotes discoloration after irradiation, and an illumination device configured using the high-pressure discharge lamp It is about.

  Conventional high-pressure discharge lamps are also known that are provided with a filter that cuts off ultraviolet rays. With the lamp having such a configuration, it is possible to prevent damage to living things and the like that do not require ultraviolet rays and part of blue light, prevent deterioration of paper and cloth, and reduce attracting insects.

  As an example of the above high-pressure discharge lamp, the one described in Patent Document 1 can be cited. In the high-pressure discharge lamp of Patent Document 1, in view of the high temperature of the lamp, an ultraviolet absorbing coating mainly composed of zinc oxide (ZnO) fine particles having excellent durability and cost is formed on the surface of the translucent glass. It has a configuration.

Further, Patent Document 2 is configured so that zinc oxide (ZnO) is doped with In, Bi, and Fe in order to improve the ultraviolet cut characteristic, and the doped metal concentration changes from the surface toward the center. An ultraviolet cut filter and a tube are disclosed.
JP 2001-143657 A JP 2006-298749 A

  In the high-pressure discharge lamp of Patent Document 1, since it includes an ultraviolet cut filter mainly composed of zinc oxide (ZnO) fine particles that are inorganic oxides, heat resistance and durability are excellent. There is a problem that the cut wavelength is about 380 nm or less, and the ultraviolet ray cut characteristics are insufficient.

  On the other hand, according to the ultraviolet cut filter and tube described in Patent Document 2, although the ultraviolet cut characteristic is improved, it is applied to a metal vapor discharge lamp in which the bulb temperature is high from about 150 ° C. to a maximum of 400 to 500 ° C. In this case, the transmittance in the vicinity of the ultraviolet region is lowered, and when applied to a metal vapor discharge lamp and a lighting fixture using the same, the light color is changed, which is not preferable.

  The present invention has been made as a solution to the above-described problems in conventional high-pressure discharge lamps, and its purpose is to prevent damage to organisms and the like that do not require ultraviolet light and some blue light, such as paper and cloth. Providing high-pressure discharge lamps that can obtain the necessary and sufficient UV-cutting properties to prevent deterioration and reduce attracting insects, and that do not change the light color even at high temperatures, and lighting equipment using the same It is to be.

  The high-pressure discharge lamp according to the present invention is an ultraviolet cut film formed by applying an ultraviolet cut material mainly composed of zinc oxide (ZnO) fine particles doped with indium (In) on the surface of a light-transmitting glass substrate bulb. When the film thickness of the UV-cut film at the center of the bulb is 1, the valve is sealed from about 30 degrees on the valve top side with reference to the 0 degree line connecting the center of the bulb and the center of the bulb surface. The first film thickness in the vicinity of the reference up to about 30 degrees on the part side is 1 ± 0.1, and the second film thickness from about 30 degrees to about 60 degrees on the valve top side is 1.1 which is equal to or greater than the maximum value of the first film thickness. An ultraviolet cut film having a thickness of 0.8 to 0.9, which is the thinnest in the film thickness of each part at a valve sealing part side of about 30 degrees to about 60 degrees; and the surface is covered with the ultraviolet cut film With a luminous tube; Characterized in that it.

  Semiconductor fine particles are produced by doping zinc oxide (ZnO) fine particles with indium (In), and the presence of this semiconductor shifts the cut wavelength, which was conventionally 380 nm or less, to the longer wavelength side. If this cut wavelength is significantly shifted to the longer wavelength side, the effects of preventing damage to living organisms, deterioration of paper and fabrics, and reducing attraction of flying insects can be improved by ultraviolet rays. The portion will be cut, causing a change in the light color and causing problems such as a decrease in transmittance.

  The cut wavelength can be controlled by adjusting the concentration of the doped metal. The doping amount of indium with respect to zinc is 2.5 to 7.5% by mass ratio.

In a metal vapor discharge lamp having a bulb temperature of about 150 ° C. to a maximum of 400 to 500 ° C., the ultraviolet cut film contains 90% by mass or more of zinc oxide (ZnO) fine particles doped with indium (In). The remaining amount of carbon in the ultraviolet cut film is preferably 0.5% by mass or less. The ultraviolet cut film can have a heat resistant temperature of 400 ° C. or higher. The content of a metal oxide such as SiO ₂ or ZrO as the inorganic binder component is desirably 20% by mass or less.

  In addition, the film thickness of the UV-cut film is not uniform over the entire surface of the light-transmitting glass substrate bulb, but the bulb from the center of the bulb is based on the 0 degree line connecting the center of the bulb and the center of the bulb surface. While increasing the top side from 30 degrees to 60 degrees, the valve sealing section side from 30 degrees to 60 degrees is made thinner from the vicinity of the central portion of the valve. As a result, when the total coating amount is the same due to the same material cost, the ultraviolet cut characteristic is improved as compared with a high pressure discharge lamp having an ultraviolet cut film whose film thickness is uniform over the entire surface of the translucent glass substrate bulb. . Here, the change in film thickness may be continuous or stepwise. Considering the light distribution distribution of the lamp itself and considering that the lamp is provided in the lighting fixture body and lights up, the light mainly emitted from the bulb sealing portion side passes through the ultraviolet cut film, and the lighting fixture The light travels in the direction and is reflected by the reflecting surface of the lighting fixture, hits the UV-cut film on the bulb surface again, where UV absorption occurs again, and the UV component is reduced to be emitted to the front side of the lighting fixture body. It is estimated that there are many things.

  On the other hand, it is presumed that a lot of light emitted from the bulb top side is emitted to the front side of the luminaire main body as it is through the ultraviolet cut film. Therefore, increase the film thickness of the UV cut coating on the bulb top side where light is expected to pass through the UV cut coating only once, and increase the thickness of the UV cut coating on the valve seal side where light is expected to pass through the UV cut coating multiple times. By reducing the film thickness, it is possible to obtain an efficient ultraviolet cut characteristic using the same material amount, and to effectively use the material of the ultraviolet cut film.

  In metal vapor discharge lamps where the bulb temperature is as high as about 400-500 ° C from around 150 ° C, the 50% cut wavelength is about 400-500 nm and the total transmission is over 500 nm as the optical characteristics of the UV-cut coating. The rate is 85% or more. For this reason, it is possible to prevent damages such as damaged organisms by ultraviolet rays, to prevent deterioration of paper or cloth, to improve the low worming action, etc., and to provide high-pressure discharge with an ultraviolet cut film that does not change light color. A lamp can be provided. When the cut wavelength is shorter than this, only the same effect as conventional zinc oxide (ZnO) can be obtained, and when the cut wavelength is longer, the light color changes to a yellowish color. Therefore, it is not preferable.

  The high-pressure discharge lamp means a metal vapor discharge lamp such as a metal halide lamp, a high-pressure sodium lamp, or a mercury lamp.

  The ultraviolet cut coating is not particularly limited as long as it has a predetermined lamp specification, but it needs to have a film thickness that allows light other than the wavelength to be cut while passing through the desired light.

  Due to the film thickness at each part as described above, as the optical characteristics of the ultraviolet cut film, the 50% cut wavelength was about 400 to 500 nm, and the total transmittance of 500 nm or more was 85% or more.

  In the high-pressure discharge lamp according to claim 2, the film thickness of the ultraviolet cut film in the central portion of the bulb is 0.5-2 μm, and the average particle diameter of zinc oxide (ZnO) fine particles doped with indium (In) is 100- It is characterized by being 200 nm.

  According to a third aspect of the present invention, there is provided a lighting fixture comprising: a fixture main body; and the high-pressure discharge lamp according to the first or second aspect.

  The high-pressure discharge lamp according to the present invention is thickened from about 30 degrees to about 60 degrees on the bulb top side from the vicinity of the central portion of the bulb with reference to the 0 degree line connecting the center in the bulb and the center of the bulb surface. Since the valve sealing part side is approximately 30 to 60 degrees thinner than the vicinity of the central part of the bulb, an efficient ultraviolet cut characteristic can be obtained using the same amount of material, and the ultraviolet cut coating material can be obtained. Effective use can be achieved. In addition, the high-pressure discharge lamp according to the present invention has a first film thickness of 1 ± 0.1 and a second film thickness of 1.1 to 1.25, assuming that the film thickness of the ultraviolet cut film at the center of the bulb is 1. Yes, since the third film thickness is 0.8 to 0.9, the light transmittance is high, it can be cut to a longer wavelength side than the conventional ultraviolet cut film made of zinc oxide (ZnO), and the effect of reducing susceptibility is high. A high-pressure discharge lamp can be provided.

  In the high pressure discharge lamp according to claim 2 of the present invention, the film thickness of the ultraviolet cut film in the central portion of the bulb is 0.5-2 μm, and the average particle diameter of the zinc oxide (ZnO) fine particles doped with indium (In) is Since the thickness is from 100 to 200 nm, a high-pressure discharge lamp having a higher light transmittance than that of the prior art and a high effect of reducing insect attracting properties can be obtained.

  According to the luminaire according to claim 3 of the present invention, since the lamp to be used is the high-pressure discharge lamp already described, the light transmittance is high, and cut to a longer wavelength side than the conventional ultraviolet cut film with zinc oxide (ZnO). Can be obtained, and a high insecticidal effect can be obtained.

  Embodiments of a high-pressure discharge lamp according to the present invention will be described below with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 shows a schematic front view of a high-pressure discharge lamp according to an embodiment of the present invention. The high-pressure discharge lamp shown here is a 250 W class metal halide lamp 10, and the metal halide lamp 10 includes an arc tube 11, and a transparent outer tube bulb 12 is provided around the arc tube 11. Is protecting. The outer tube bulb 12 is provided with an E-type base 13 that is a power supply means that is electrically connected to the arc tube 11.

  An ultraviolet cut film 14 is coated on the outer surface of the outer bulb 12. The ultraviolet cut film 14 has optical characteristics such that a 50% cut wavelength is about 400 to 500 nm and a total transmittance of 500 nm or more is 85% or more. As a result, almost only visible light is emitted from the outer bulb 12 of the metal halide lamp 10.

  The ultraviolet cut film 14 is mainly composed of zinc oxide (ZnO) fine particles doped with indium (In). The zinc oxide (ZnO) fine particles doped with indium (In) have a substantially spherical shape and an average particle diameter of 100 to 200 nm.

  In the ultraviolet cut film 14, when the film thickness of the ultraviolet cut film in the central portion of the outer tube bulb 12 is used as a reference, the region I in the range from about 30 degrees on the bulb top side to about 30 degrees on the bulb sealing portion side. The film thickness is the first film thickness in the vicinity of the reference, the film thickness in the region II from about 30 degrees to about 60 degrees on the valve top side is the second film thickness that is equal to or larger than the maximum value of the first film thickness, The film thickness of the region III from about 30 degrees to about 60 degrees on the sealing section side is the third film thickness that is the thinnest among the film thickness of each section. The above angle indicates an angle based on a 0-degree line connecting the center in the outer tube valve 12 and the center of the valve surface.

  As a specific example, when the film thickness of the ultraviolet cut film 14 in the central portion of the outer tube bulb 12 is 1, the first film thickness in the region I is 1 ± 0.1, and the second film thickness in the region II is 1.1 to 1.25, and the third film thickness in region III is 0.8 to 0.9. Here, the change in film thickness may be continuous or stepwise.

  Next, the manufacturing method of the ultraviolet cut film 14 is demonstrated. First, zinc oxide (ZnO) fine particles doped with indium (In) as an ultraviolet cut material are produced by, for example, hydrolyzing zinc acetate and indium chloride in an aqueous solution, and then drying and heat-treating. The indium doping amount of this ultraviolet ray-cutting material is 2.5 to 7.5% by mass with respect to Zn. The indium-doped zinc oxide (ZnO) fine particles, which are UV-cutting materials, are dispersed in an ethanol + water solvent, and a silica binder is added to obtain a dispersion having a desired concentration within a range of 10 to 20% by mass. Adjust the liquid. This dispersion is applied to the outer surface of the outer tube valve 12 to obtain a coating film having the above-described film thickness in the aforementioned regions I to III. This coating film is heat-treated at 300 to 700 ° C. for a predetermined time in an air atmosphere to form an ultraviolet cut coating 14.

  In the above regions I to III, when the dispersion liquid is applied to the outer surface of the outer tube valve 12 to obtain a coating film having the above-described film thickness, for example, as shown in FIG. Then, the container 30 is immersed in the dispersion liquid P filled to a predetermined extent, and gradually lifted upward (in the direction of the arrow). In the case of this pulling, the pulling speed is controlled to obtain a desired film thickness. As the pulling speed is increased, the film thickness increases at the boundary point B where the outer pipe valve 12 is immersed in the dispersion P, and at the boundary point B where the outer pipe valve 12 is immersed in the dispersion P as the pulling speed is decreased. The film thickness becomes thin. That is, by adjusting the pulling rate of the remaining amount of the dispersion P that adheres to the outer surface of the outer pipe valve 12 at the boundary point B, the film thickness as described above is obtained in the above regions I to III. To do. In this case, the film thickness of the region I is in the range of 0.5 to 2.0 μm, for example, 1.0 μm.

The grounds for changing the film thickness of the ultraviolet cut film 14 in the regions I to III as described above will be described. Each region I in the high pressure discharge lamp having the UVA amount UVA _NON in each region I to III in the high pressure discharge lamp having the outer bulb 12 having no UV cut coating and the outer bulb 12 having the UV cut coating having a uniform film thickness. When the UVA amount UVA _{CUT at} ˜III is measured and UVA _CUT / (UVA _NON ) is graphed, FIG. 3 is obtained. FIG. 3 is drawn assuming that UVA _CUT / (UVA _NON ) at the center of the outer tube valve 12 is 1.

As apparent from FIG. 3, since the UVA _NON is relatively large on the valve top side, the relative value is reduced to 1.0 or less, and since the UVA _NON is relatively small on the valve sealing side, the relative value is relatively small. It can be inferred that the value has risen to 1.0 or more.

  Therefore, when the film thickness of the ultraviolet cut film 14 at the center of the outer tube bulb 12 is 1, the film thickness of the ultraviolet cut film 14 is changed as shown in FIG. In the region I, the range from about 30 degrees on the valve top side to about 30 degrees on the valve sealing portion side is generally “1”. That is, the first film thickness in region I is 1 ± 0.1. It is 1.2 at about 60 degrees on the valve top side. The film thickness of the ultraviolet cut film 14 is changed so that a line segment connecting a value of about 30 degrees on the valve top side and a value of about 0 degrees on the valve top side 6 becomes a value indicated. That is, the second film thickness in the region II is 1.1 to 1.25. It is 0.85 at about 60 degrees on the valve sealing portion side. The film thickness of the ultraviolet cut film 14 is changed so that a line segment connecting a value of about 30 degrees on the valve sealing portion side and a value of about 60 degrees on the valve sealing portion side becomes a value indicated. That is, the third film thickness in the region III is 0.8 to 0.9.

  As described above, since the film thickness of the ultraviolet cut film 14 is controlled, efficient ultraviolet cut characteristics can be obtained using the same material amount, and the effective use of the material of the ultraviolet cut film can be achieved. In addition, the light color does not change to a yellowish color, prevents damage to organisms that do not require ultraviolet light and some blue light, prevents deterioration of paper, cloth, etc. The metal halide lamp 10 having the above can be provided.

  The ultraviolet cut coating 14 is not limited to the case where it is applied to the outer surface of the outer tube bulb 12 of the metal halide lamp 10, and can be formed on either one of the inner and outer surfaces of the outer tube bulb 12.

  As the optical characteristics of the ultraviolet cut film, the 50% cut wavelength is about 400 to 500 nm, and the total transmittance of 500 nm or more is 85% or more. For this reason, it is possible to prevent damages such as damaged organisms by ultraviolet rays, to prevent deterioration of paper or cloth, to improve the low worming action, etc., and to provide high-pressure discharge with an ultraviolet cut film that does not change light color. A lamp can be provided. When the cut wavelength is shorter than this, only the same effect as conventional zinc oxide (ZnO) can be obtained, and when the cut wavelength is longer, the light color changes to a yellowish color. Therefore, it is not preferable.

  In addition, the ultraviolet cut coating contains 90% by mass or more of zinc oxide (ZnO) fine particles doped with indium (In), and by setting the remaining amount of carbon in the ultraviolet cut coating to 0.5% by mass or less, the valve temperature Is also effective in a metal vapor discharge lamp having a high temperature of about 400 to 500 ° C. from around 150 ° C. If the remaining amount of carbon exceeds 0.5% by mass, it is easy to cause a decrease in transmittance when the lamp is lit continuously.

  In addition, the film thickness of the UV-cut film at the center of the bulb is 0.5-2 μm, and the average particle size of zinc oxide (ZnO) fine particles doped with indium (In) is 100-200 nm. It is possible to obtain a high-pressure discharge lamp having a high transmittance and a high effect of reducing insect attracting properties.

  FIG. 5 is a graph showing spectral radiation characteristics (Relative Intensity vs wave length) of the metal halide lamp according to the first embodiment, and particularly shows around 350 nm to 500 nm. In this graph, (A) has an ultraviolet cut film mainly composed of zinc oxide (ZnO) fine particles doped with indium (In), and (C) shows zinc oxide (described in Patent Document 1). ZnO) has an ultraviolet cut film, and (D) has no ultraviolet cut film. (A) shows a material in which In / Zn (molar ratio) of indium (In) -doped zinc oxide (ZnO) fine particles is about 5/95. (E) shows the relative luminous factor (wave length) curve of insects, and (F) shows the relative damage degree curve of papermaking.

  Referring to FIG. 5, it can be seen that the metal halide lamp having the ultraviolet cut film of (A) effectively cuts blue light in the wavelength region of 405 to 425 nm. The metal halide lamp having the ultraviolet cut film of (C) cuts ultraviolet rays having a wavelength of less than 405 nm, but hardly cuts ultraviolet rays having a wavelength of 405 nm or more, and there is no significant difference in characteristics from those of (D). . Moreover, the metal halide lamp having the ultraviolet cut film of (A) cuts ultraviolet rays at the peak of the relative luminous sensitivity curve of the insect shown by (E) (around 350 nm), and the relative breakage curve of the papermaking shown by (F). It is a high-pressure discharge lamp that is known to cut ultraviolet rays in a region with a high degree of breakage (450 nm or less), has a high effect of reducing attractivity, and can prevent deterioration of paper and cloth.

  FIG. 6 is a schematic cross-sectional view showing a lighting apparatus according to a second embodiment of the present invention. In this lighting fixture, the high-pressure discharge lamp 10 is accommodated in the lighting fixture 40. The luminaire 40 of the present embodiment includes a reflector 41 having an opening 43 on the lower surface and an inner wall that is generally a paraboloid. The uppermost part of the reflector 41 has a cylindrical shape, and a socket 42 is provided here.

  The intermediate halide lamp 10 is attached to the luminaire 40 by screwing its base into the socket 42. According to such a luminaire, it is possible to prevent damage to organisms and the like that do not change light color and do not require ultraviolet light and part of blue light, and can prevent deterioration of paper and cloth. It can be used as a lighting fixture with a high effect of reducing properties.

1 is a schematic front view showing a high-pressure discharge lamp according to an embodiment of the present invention. The schematic front view which shows the preparation process of the high pressure discharge lamp which concerns on the Example of invention. The figure which shows the transition by the lamp | ramp part of the value which remove | divided the UVA amount of the high pressure discharge lamp which has an ultraviolet cut film by the UVA amount of the high pressure discharge lamp which does not have an ultraviolet cut film. The figure which shows the transition by a lamp | ramp part about the film thickness of the ultraviolet-ray cut film with which the high pressure discharge lamp which concerns on the Example of invention is provided. It is a graph which shows the spectral radiation characteristic of the metal halide lamp which concerns on 1st Embodiment, and the figure which showed especially 350 nm-about 500 nm vicinity. The schematic sectional drawing which shows the lighting fixture of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Metal halide lamp 11 Light emission tube 12 Outer tube bulb 13 Base 14 UV cut coating 30 Container 40 Lighting fixture 41 Reflector 42 Socket 43 Opening

Claims (3)

An ultraviolet cut film formed by applying an ultraviolet cut material mainly composed of zinc oxide (ZnO) fine particles doped with indium (In) on the surface of a light-transmitting glass substrate bulb, and an ultraviolet ray in the central portion of the bulb When the film thickness of the cut coating is 1, the reference vicinity from about 30 degrees on the valve top side to about 30 degrees on the valve seal side, with reference to the 0 degree line connecting the center of the valve and the center of the valve surface The first film thickness is 1 ± 0.1, the second film thickness from about 30 degrees to about 60 degrees on the valve top side is 1.1 to 1.25 which is not less than the maximum value of the first film thickness, and the valve sealing portion An ultraviolet cut film having a third film thickness of about 30 to about 60 degrees on the side of 0.8 to 0.9, which is the thinnest film thickness of each part;
An arc tube whose surface is covered with a UV-cut coating;
A high-pressure discharge lamp comprising: The film thickness of the ultraviolet cut film at the central portion of the bulb is 0.5 to 2 µm, and the average particle diameter of zinc oxide (ZnO) fine particles doped with indium (In) is 100 to 200 nm. A high-pressure discharge lamp as described in 1. An instrument body;
A high pressure discharge lamp according to claim 1 or 2;

Images