JPH0467504A - Ultraviolet-ray shielding globe for discharge lamp device and formation of ultraviolet-ray shielding film - Google Patents

Abstract

PURPOSE:To uniformly form a ultraviolet-ray shielding film made of a metal oxide wholly on both the inside and outside of a globe by dipping the cup-shaped globe opened with an air hole at a tip closure section into a metal oxide solution with a ultraviolet-ray shielding function from the opening side. CONSTITUTION:A hollow pipe 31 is integrally connected by welding to the tip closure section of a globe 30A. A metal oxide ZnO with a ultraviolet-ray absorbing function is dissolved in a solvent serving as a binder, and a ZnO solution is prepared in a container 50. The hollow pipe 31 is held, and the globe 31A is dipped into the ZnO solution from the opening side. As the globe 30A is lowered, the air in the globe 30A is released to the outside via the hollow pipe 31, and the globe 31A is wholly dipped in the ZnO solution. The globe 30A is lifted and taken out of the ZnO solution, it is dried while the opening side is faced downward, and the hollow pipe 31 is pinched off at the root position after the drying process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming an ultraviolet shielding glove and an ultraviolet shielding film surrounding a discharge lamp in a discharge lamp device.

[Prior art and problems to be solved by the invention] In the recent automotive lamp industry, lamps with good luminous efficiency and color rendering properties,
Furthermore, discharge lamps are attracting attention because of their long lifespan. However, for example, a metal halide lamp, which is a type of discharge lamp, generates a large amount of ultraviolet light as well as visible light when emitting light due to the sealing gas (mercury, iodide, Xe gas) in the discharge space. and wavelength range 240-290n
Ultraviolet rays of m destroy protein molecules, and the wavelength range is 290.
It is said that ultraviolet rays in the wavelength range of 320 nm to 320 nm cause skin cancer, and ultraviolet rays in the wavelength range of 360 to 370 nm destroy resin materials. As described above, since the light emitted from the discharge lamp contains ultraviolet rays that are harmful to the human body, there is a problem in that exposure to the irradiation over a long period of time is not good for health, and the resin members around the discharge lamp deteriorate quickly.

For this reason, Japanese Patent Application No. 2-100503 has been proposed as a technique for cutting ultraviolet rays from the light emitted by discharge lamps.

This has a structure in which a discharge lamp protruding from the base is completely covered with a cup-shaped UV-shielding glove. The UV-shielding glove is made by forming a film of a metal oxide such as ZnO on the inside and/or outside of a cup-shaped glass globe that has a UV-blocking effect.
When the light emitted from the discharge lamp passes through the globe, ultraviolet rays are blocked. A metal oxide film is formed on the cup-shaped globe by dipping (immersion in a metal oxide solution).

[Problem to be solved by the invention]

However, as a method for forming metal oxide films up to now, the fifth
As shown in Figure (a), when the cup-shaped glove 2 is immersed in the metal oxide solution 4 from the opening side, the glove 2
Since the air inside the glove cannot be released and the inside of the glove cannot be brought into contact with the solution 4, the glove 2 is tilted as shown in Figure 5(b) to remove the air and the entire inside of the glove 2 is brought into contact with the solution. The work is troublesome. In addition, if the dipping operation is not performed properly, air may remain in the glove 2 and there may be areas where the coating is not applied or where the film thickness is insufficient, resulting in a defective product. Furthermore, in order to take out the glove 2 after soaking, the glove 2 is grabbed with a jig or hand and taken out, so the film thickness of the gripped part is not the same as other parts, and after drying, there may be dirt or marks on the glove 2. There was also the problem that the appearance was undesirable due to the appearance of hail.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide an ultraviolet shielding glove for a discharge lamp device and an ultraviolet shielding film capable of uniformly forming an ultraviolet shielding film made of a metal oxide on both the inside and outside of the glove. The object of the present invention is to provide a forming method.

[Means to solve the problem]

In order to achieve the above object, the ultraviolet ray shielding glove for a discharge lamp device according to claim (1) has a structure in which a metal oxide film having an ultraviolet ray shielding effect is formed on the cup-shaped globe, and the discharge lamp is surrounded by the cup-shaped globe. In the ultraviolet-shielding glove that blocks ultraviolet rays from the emission of a discharge lamp, the ultraviolet-shielding glove is a cup-shaped glove with an air hole in the closed end portion, which is dipped into a metal oxide solution having an ultraviolet-shielding effect from the opening side. It is immersed to form a metal oxide film on both the inside and outside of the glove.

Further, in the method for forming an ultraviolet shielding film according to claim (2), a hollow pipe that communicates with the inside of the glove is connected and integrated with the closed end portion of the cup-shaped glove, and the cup-shaped glove is held on the open side by gripping the hollow pipe. The glove is immersed in a metal oxide solution that has an ultraviolet shielding effect to form a metal oxide film on both the inside and outside of the glove.

[Effect]

When the cup-shaped glove was placed into the metal oxide solution from the open side while holding the hollow pipe, the air inside the glove escaped to the outside of the glove through the hollow pipe, ensuring that both the inside and outside of the glove were in contact with the metal oxide solution. state, that is, an immersed state.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

1 to 3 show a first embodiment of the present invention,
FIG. 1 is a partially cutaway side view of the discharge lamp device;
Figure 2 is a cross-sectional view of the lamp device (the line shown in Figure 1 -
FIG. 3 is a perspective view of the main parts of the lamp device.

In the figures of 29 et al., the discharge lamp device 10 includes a discharge lamp 12 which is a light emitting part, lead supports 22 and 24 which protrude from an insulating base 2° and support the discharge lamp 12, and an ultraviolet light source surrounding the discharge lamp 12. Gloves for shielding 3
It is mainly composed of 0 and 0.

The discharge lamp 12 has an ellipsoid-shaped sealed glass bulb 13 formed by pinching both ends of a quartz glass tube to form a discharge space.
It has a structure in which pinch parts 14, 14 are formed at both ends of the glass bulb 13, and a starting rare gas, mercury, and metal halide are sealed in the glass bulb 13.6 Also, a tungsten discharge electrode 15 is placed in the discharge space. The discharge electrodes 15.15 are connected to molybdenum i16 sealed to the pinch part 14.14, and the end of the pinch part 14 is connected to a lead wire 18° connected to the molybdenum foil 16. 18 has been derived. The discharge lamp 12 includes a metal support 19a, a pair of long and short lead supports 22 and 24 that are insert-molded in the insulating base 20 and protrude toward the front of the base.
19b. That is, the metal support 19a vertically welded to the lead support 22 grips one pinch portion 14 of the discharge lamp 12, the lead wire is connected to this metal support 19a, and the lead wire 18 at the other end is connected to the metal support 19a.
is sandwiched between and welded to the metal support 19b which is welded to and suspended from the lead support 24. The insulating base 20 is made of, for example, a synthetic resin material, and is integrally formed with a disc-shaped base 20a and a disc-shaped protrusion 20b that is slightly thicker and smaller in diameter than the base 20a. Note that the reference numeral 17 is an insulating cylindrical body made of ceramic and fitted to the lead stay 22 for preventing discharge.

Reference number 30 is a cylindrical cup-shaped UV shielding glove with a spherical front end and an open rear end, and is 1M! It is fixed to the frame base 20 and completely covers the lead supports 22, 24 and the discharge lamp 12.

Reference numeral 30a is a pinch-off portion. The rear end opening of the glove 30 is sized to fit on the outer periphery of the protruding portion 20b of the base 20, and a metal plate 40 provided on the base 20 can be press-fitted into the outer periphery of the rear end opening by caulking. A recess 32 is formed. The metal plate 40 has a portion 41 that is insert-molded into the base 20 and is integrated into the base 20. A rectangular portion 42 of the metal plate 40 protrudes from the front surface of the base, and there is a gap between the base protruding portion 2ob and the rectangular portion 42. A gap corresponding to the thickness of the globe 3o is formed. metal plate 4
0 are provided at four equal positions in the circumferential direction, and the globe 3
0 to the base 20, first fit the rear end of the glove 3o into the base protrusion 20b so that the opening side of the glove 3o is just sandwiched between the metal plate 40 and the base protrusion 20b, and The metal plate 40 and the recess 32 are made to correspond. Next, the rectangular portion 42 of the metal plate 40 is pushed radially inward from the outside using a metal rod 33 (see FIG. 2), which is a jig, to partially deform the rectangular portion 42 and push it into the recess 32. Press fit and secure the rear end opening of the glove to the base 2o by caulking. Reference numeral 43 in FIGS. 1 and 2 indicates a caulking portion. As a result, the rear end opening of the globe is kept closed by the base protrusion 20b, and the discharge lamp 12 is completely covered by the globe 3o and the base 20. The space around the discharge lamp 12 is sealed by the ultraviolet shielding glove 3o, and the space around the discharge lamp 12 is sealed.
The ultraviolet rays emitted from the body are reliably blocked by the ultraviolet ray shielding glove 3o.

The ultraviolet shielding glove 30 has an ultraviolet shielding film 34 made of Zn○ on both the inner and outer sides of a glass globe with a closed end.
The structure is coated with discharge lamp 1.
An ultraviolet shielding film 34 covering the globe 30 absorbs ultraviolet rays generated simultaneously with the emission of light from the discharge lamp, and only visible light from which ultraviolet rays are cut is emitted to the outside of the globe 30. Note that in order to set the transmittance of ultraviolet rays in the wavelength range shorter than 370 nm to O, a film thickness of 1.6 μm or more is required, and from the standpoint of preventing peeling, a film thickness of 5 μm or less is desirable. In addition, the wavelength range of ultraviolet rays that can be cut varies depending on the temperature around the glove (the wavelength range that can be cut shifts to the longer wavelength side when the temperature is high), so at least the wavelength range of 370 to 38
The film thickness is said to be such that it can block ultraviolet rays of 0 nm or less. Note that the film thickness can be adjusted by changing the speed at which the glove is pulled up in the dipping step (described later), or by changing the number of times of dipping.

Next, the fourth method of forming a ZnO film on both the inside and outside of a cup-shaped glass globe (hereinafter simply referred to as a globe) is described.
This will be explained based on FIGS. (a) to (c).

First, the hollow pipe 31 is connected and integrated with the closed end portion of the glove 30A by welding (see FIG. 4(a)), and the inside of the glove 30A is brought into communication with the pipe 31. On the other hand, ZnO, a metal oxide with ultraviolet absorbing properties, was dissolved in a solvent as a binder, as shown in Figure 4(a).
A Zn○ solution with a concentration of 20 to 30% is prepared in the container 50. Next, the hollow pipe 31 is held directly by hand or by a jig, and the glove 30A is immersed in the ZnO solution from the open side. As the glove 30A descends, the air inside the glove 30A escapes through the hollow pipe 31 as shown in FIG. 4(b), and as shown in FIG. 3OA is immersed in the ZnO solution. After that, raise the globe 30A and remove the ZnO.
Remove from the solution and air dry with the open side facing downward.

After the drying process, the hollow pipe 31 is cut at the root position with a cutter or pinched off with a burner or the like.

When cutting with a cutter, the communication hole with the hollow pipe is closed with synthetic resin or the like.

In the above-mentioned embodiment, the ultraviolet shielding film 34 was made of ZnO, but the ultraviolet absorption effect is inferior to that of Zn○, but even if it is made of a metal oxide with an ultraviolet absorption effect such as TiO2, CaO, Fe2O8, etc. good.

〔Effect of the invention〕

As is clear from the above explanation, according to the method for forming an ultraviolet shielding film according to the present invention, when a cup-shaped globe is placed into a metal oxide solution from the opening side while holding a hollow pipe, the air inside the globe becomes hollow. Exit the glove through the pipe,
Since both the inside and outside of the glove can be reliably brought into contact with the metal oxide solution, that is, immersed, it is easy to form a UV-shielding film, and the UV-shielding film can be formed on both the inside and outside without any unpainted spots or uneven coating. You will get a glove that is

Further, according to the ultraviolet shielding glove according to the present invention, since the ultraviolet shielding film is formed on both the inner and outer sides, the thickness of the film on the inner and outer sides is smaller than that in the case where the shielding film is formed on either the inside or the outside. The thickness of each film can be reduced to 1/2. Therefore, the film thickness can be made more uniform and the ultraviolet absorption effect can be improved.

The thinner the layer, the less likely it will peel off and the more durable it will be.

[Brief explanation of drawings]

Fig. 1 is a side view showing a part of a discharge lamp device in cross section showing the state of use of the ultraviolet shielding glove according to the present invention, and Fig. 2 is a cross-sectional view of the same lamp device (the line - H shown in Fig. 1 Figure 3 is a perspective view of the same lamp device with the UV-shielding glove removed, and Figures 4 (,) to (C) illustrate the process of immersing the cup-shaped glove in a metal oxide solution. FIGS. 5(a) and 5(b) are explanatory diagrams illustrating a method of forming an ultraviolet shielding film in the prior art. DESCRIPTION OF SYMBOLS 10...Discharge lamp device, 12...Discharge lamp, 30...Globe for ultraviolet rays shielding, 30A cup-shaped globe, 31...Hollow pipe forming an air hole, 34...Ultraviolet rays shielding film A certain Zn○ film. Fig. ■ Fig. 2N 0a20b Fig. (a) Fig. (b) Fig. 4 (c)

Claims (2)

[Claims] (1) An ultraviolet shielding glove that has a structure in which a metal oxide film having an ultraviolet shielding effect is formed on a cup-shaped glove, and that surrounds a discharge lamp and blocks ultraviolet rays from light emission from the discharge lamp, wherein the ultraviolet shielding glove includes: A cup-shaped glove with an air hole in the closed end is immersed from the opening side into a metal oxide solution that has an ultraviolet shielding effect, and a metal oxide film is formed on both the inside and outside of the glove. UV shielding glove for discharge lamp equipment. (2) Connect and integrate a hollow pipe that communicates with the inside of the glove to the closed end of the cup-shaped glove, grasp this hollow pipe, and immerse the cup-shaped glove from the opening side into a metal oxide solution that has an ultraviolet shielding effect. A method for forming an ultraviolet shielding film in an ultraviolet shielding glove for a discharge lamp device, comprising forming a metal oxide film on both the inside and outside of the glove.