JPS60257060A - Metallic vapor discharge lamp and its manufacture - Google Patents

Abstract

PURPOSE:To improve luminous efficiency by providing a heat insulating body made of fiber type material that is fixed to the end of a luminous tube by means of heating and curing. CONSTITUTION:While a luminous tube 1 is rotated slowly, a preset amount of, fiber cloth type material 16 made of crystal glass wool is wound aroung the one end. Then, the wound surface is heated and cured by the flame 13 of a gas burner and secured to the luminous tube 1. The luminous tube 1 with a heat insulating body 5 constructed in such a way is sealed in an outer tube together with nitrogen gas. Since the heat insulating effect of the heat insulating body 5 is improved greatly as compared with that of the conventional body, the luminous efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to improving the efficiency of metal vapor discharge lamps such as metal halide lamps and to methods of manufacturing the same.

[Prior art]

Conventionally, this type of lamp, for example, a 400W metal halide lamp manufactured by Mitsubishi Electric (M40OL-J/Bv), has a structure as shown in FIG. In the figure, +11 is an arc tube with electrodes (2a) and (2b) provided at both ends.

Appropriate amounts of rare gas, mercury, scandium, and decathorium iodide are sealed in a translucent quartz tube. (3) is an outer tube, and the arc tube (1) is filled with a predetermined gas inside the outer tube, such as nitrogen gas. It is enclosed with. (4) is a base fixed to the soil part of the outer tube (31), and its poles are connected to the electrodes (2a) and (2b), respectively. (5) is the lower sealing part of the arc tube +11 (
Part of A) and the discharge space surrounding part adjacent above it)
It is a zirconia heat insulator that covers part of the

A metal halide lamp with such a structure first has electrodes (2a), (2b), molybdenum metal foil (Sa3. (6b)) and leads (7a) at both ends of the arc tube material.

Electrode structures (8a) and (8b) consisting of (7b) are inserted, heated and melted, and sealed with a press head. After that, the air in the arc tube (1) is exhausted from the chip tube (9), and then a rare gas such as argon, neon-argon, neon-krypton, etc. is filled, and then mercury, toscandium, and
The chip tube (9) is sealed by enclosing IJium iodide. To form a heat insulator at a predetermined position at the end of the arc tube (+) manufactured in this way.

As shown in Figure 2, wrap the tape 4 from the end of the arc tube 0) to the non-applying position, and add white powder of zirconium oxide and a binder that melts at a relatively low temperature to a volatile organic solvent in a container (Ill). Apply by lowering the tape Ql downward to the desired position into the mixed coating solution H containing the powder.Next, take out one arc tube full from the coating solution Q2 and let it dry naturally in the atmosphere. .

If the coating dries and you want to increase the film thickness, add it to the coating solution again.
Dry naturally. Once the paint film is dry.

As shown in Fig. 3, remove the tape 0I wrapped around the end of 1 arc tube (11), rotate the 1 arc tube (1) several times, and then apply a flame θ4 from a gas burner from outside to remove the coating film. Baking 1 A heat insulating body (5) is formed at the end of the arc tube (1).Both ends of the arc tube (1) having the heat insulating body (5) thus created are separated as shown in FIG. Each is sandwiched between retaining plates I and fixed by welding to the support frame a, and this is attached to the outer tube (3
), exhaust the air from the outer tube (3) to create a vacuum, and then fill it with a predetermined amount of nitrogen gas.

The above configuration is based on the base-up (lit with the base (4) facing up), with 2 lit arc tubes + 1
Due to the convection of the gas inside 1 and the convection of the gas inside the outer tube, the arc tube (the lower part of 11 becomes the coldest part and is made of scandium)
This method was devised to improve the problem that the vapor pressure of metal iodides such as Jium did not rise sufficiently, resulting in low lamp efficiency and poor light source color. This prevents the temperature of the coldest part from dropping. However, the heat insulating body (5) has poor light transmittance and insufficient heat retention, and if the film thickness is increased to increase heat retention, the film (5) will be damaged due to vibration during transportation, heat cycle due to one flash, etc. It had the drawback of peeling off.

In addition, the method of forming a metal halide dump, especially the heat insulating body (5) as shown in Figure 1, involves the steps of pouring into the coating liquid, drying, and baking, which results in poor workability. There were disadvantages in that the film thickness was not constant or the paint film peeled off during the second operation, and when the film thickness of the paint film was increased, cracking and falling off occurred.

In addition, due to the use of volatile organic solvents, there are safety concerns.
We had to set up special facilities.

[Summary of the invention]

This invention was made for the purpose of improving the above-mentioned drawbacks.1
A metal vapor discharge lamp in which a heat insulator made of a fibrous material fixed by heating and solidification is provided at the end of the arc tube to improve heat retention and efficiency, and a method for manufacturing this heat insulator at the end of the arc tube. By wrapping a cloth-like fibrous substance around the blade and fixing it by heat at the cutting edge afterward, workability is improved and organic solvents are not used, providing a highly safe manufacturing method. It is.

[Embodiments of the invention]

The details of this invention will be explained below according to the illustrated embodiments. A pair of electrode structures (8a
) (8b) to prepare an arc tube (1) in which argon, a predetermined amount of mercury, and iodides of scandium and sodium are sealed as a rare gas for starting. While slowly rotating this arc tube (+1) as shown in Fig. 5, a cloth-like fibrous material θe of quartz glass wool was attached to one end of the arc tube (+1).
Wrap it around the specified amount.

Next, the wrapped surface is heated and solidified by the flame (11) of a gas burner as shown in Fig. 6, and fixed to the arc tube +11.
i+ is sandwiched between retaining plates 041 and welded to the support frame 09 in the same manner as in the conventional method shown in FIG. 4, and this is sealed together with nitrogen gas in the outer tube 0).

The metal vapor discharge lamp constructed in this way has an arc tube (1
Since the heat retaining effect of the heat insulating body (5) provided in the heat insulating body (5) is greatly improved compared to the conventional one, the efficiency of light emitted from the outer tube is improved.

This is after the heat insulator (5) has wrapped the cloth-like fibrous material.

Since the outside part is heated and solidified by the flame of the gas burner, the part of the inside part 1 in contact with the arc tube (1) remains fibrous and forms an air layer, but the outside part melts and solidifies and becomes glassy and prevents air flow. This is thought to be because the air layer inside forms a heat insulating layer.

For example, the inner diameter is 20mm, the distance between electrodes (2a) (2'b) is 45mg, and 40mg of sodium iodide is inside and T~
An arc tube (1) is made in which an appropriate amount of mercury and argon is sealed together with scandium iodide, and one end of the inner wall of the arc tube (1) is placed at one end of the arc tube (1) on the center side of the
A heat insulating body (5) with a thickness of 5 mm was provided by winding quartz glass wool in a range of 1 M and 7 WIN on the end side and welding and fixing this with a gas burner. A metal halide lamp was made in which this arc tube (1) was sealed in the outer tube (3) with nitrogen gas at 5fiQTorr as the gas inside the outer tube, and the efficiency at 400W lighting after 100 hours of rated lighting was measured, and the value was 98tm. /W.

As a comparative example, a metal halide lamp with a zirconia heat insulating body (5) arc tube +11 was made with exactly the same specifications as above, and the efficiency was measured at 400 W lighting after 100 hours of rated lighting, and the result was 85 tm/W. there were.

In this way, the heat insulator (5) is made of quartz glass wool.

By heating the outside, the efficiency can be improved by about 15 factors.

On the other hand, the manufacturing method for this heat insulating body (5) is to wrap cloth-like quartz glass wool and weld and solidify it from the outside with a gas burner or other flame (13), which reduces the number of steps, and also requires a natural drying step. The manufacturing time can be greatly reduced as there is no need for paint film to peel off during the process, the film thickness may become uneven, and increasing the film thickness may cause the paint film to crack or fall off. Since this low-volatility organic solvent does not have to be used, there is no need to take special considerations for work safety.

In the second embodiment, quartz glass wool was used as the fibrous material for the heat insulator, but a mixture of quartz glass wool and ceramic fiber may also be used.

Furthermore, the heat insulating body may be provided not only at one end but also at both ends.

〔Effect of the invention〕

As described above, this invention uses a fibrous material that is solidified and fixed by heating for the heat insulating body of the arc tube, which improves the heat insulating effect, thereby improving efficiency, and also reduces vibration during transportation and during lighting. We provide a metal vapor discharge lamp whose heat insulating body does not peel off due to heat cycles, etc., and the heat insulating body can be formed by simply wrapping a cloth-like fiber material around the end of the arc tube and heating the outside, reducing man-hours and manufacturing. The purpose of the present invention is to provide a manufacturing method that requires less time and requires no consideration for work safety since only organic solvents are used.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional metal vapor discharge lamp. Figure 2 is an enlarged front view showing the process of attaching the heat insulator to the arc tube, Figure 3 is an enlarged front view showing the process of fixing the heat insulator, and Figure 4 is the support for the arc tube (9). FIG. 5 is an enlarged front view of the main part fixed to the hehe frame, and FIG. 5 is an enlarged front view showing how the heat insulating body is attached, showing one embodiment of the present invention. FIG. 6 is an enlarged front view showing the fixing method. Symbols in the figure (11 is an arc tube, (2a), (2b) are electrodes,
(3) is the outer tube, (4) is the cap, (5) is the heat insulator, (8a
), (sb) is the electrode structure, (II is the tape, O'
The IJ is a coating liquid, the O trench is a flame, and the side is a cloth-like fibrous material. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa (10) Figure 1 Figure 2 Figure 3 Continued from page 1 0 Author: Masato Saito 2-2 Ofuna, Kamakura City Author: Gai Watanabe 2-14 Ofuna, Kamakura City
No. 40J+ Mitsubishi Electric Corporation Product Research Laboratory lower number 14-4
Tsui Mitsubishi Electric Corporation Product Research Institute Procedures Amendment (Voluntary) ■8和 5q, r. March 13th 1. Title of the invention □ Metal vapor discharge lamp and its manufacturing method 1 3. Person making the amendment: Relationship to the case Patent applicant address 2-2-2 Marunouchi, Chiyoda-ku, Tokyo Name Name
(601,) Mitsubishi Electric Corporation representative Hitoshi Katayama Department 4, agent i, detailed description of the invention in the specification subject to amendment. i The statement of contents of the amendment shall be amended as follows. (2)

Claims (4)

[Claims] (1) An arc tube filled with at least mercury and a rare gas;
In a metal vapor discharge lamp equipped with an outer bulb in which this arc tube is sealed together with a predetermined gas inside the outer bulb, a heat insulator made of a fibrous material is solidified and fixed to the end of the arc tube by heating. A metal vapor discharge lamp characterized by being provided with. (2) The metal vapor discharge lamp according to claim 1, wherein the fibrous material is made of quartz glass wool. (3) The metal vapor discharge lamp according to claim 1, wherein the fibrous material is made of ceramic fiber. (4) A step of sealing an electrode assembly at both ends of the arc tube, a step of evacuating the air in the arc tube to which the electrode assembly is sealed, and then filling a predetermined amount of rare gas and mercury; A process for manufacturing an arc tube includes the steps of: winding a cloth-like fibrous material around the tube end of the arc tube in which mercury is sealed; and heating the cloth-like fibrous material from the outside to assimilate and fix the material. Characteristic metal vapor discharge lamp.