JPS6040656B2 - Manufacturing method of metal vapor discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal vapor discharge lamp in which mercury, a rare gas, and a metal halide are sealed inside a quartz arc tube. The present invention relates to a method of manufacturing a metal vapor discharge lamp provided with a heat retaining film.

Metal halide lamps, in which a small amount of metal iodide is sealed together with mercury and rare gases inside a quartz arc tube, have poor luminous efficiency and color rendering properties, but a heat insulating film is placed at the end of the arc tube, which is the coldest part of the arc tube. A method is generally adopted in which the metal iodide is sufficiently evaporated.

This heat insulation film contains Z2, N203, Mg0, Ti02, S
A method has been explored in which a white paint mixed with a binder such as shelf silicate glass powder, sodium silicate powder, or shelf acid is applied to a fine white powder such as i02, and then heated to a high temperature to make it stick. was. (For example, Japanese Patent Application Laid-Open No. 52-11!9483, etc.). However, shelf silicate glass... Alternatively, when a binder containing shelf elements such as shelf acid is used to light up a discharge lamp, the shelf elements diffuse into the quartz arc tube and react with it, causing devitrification or cracking.
Furthermore, although sodium oxalate has excellent binding properties as it is known as the main component of water glass, sodium diffuses into the quartz arc tube and reacts with it, causing devitrification or cracks. Therefore, a method was sought to suppress the reaction with the quartz arc tube as much as possible by adding a small amount of binder, but the binding property was also reduced and SI was unavoidable. The present invention was made in order to solve the above-mentioned problem, and involves adding a heat-resistant white powder that does not react with quartz to the end of the arc tube, and a pig solution of a metal oxide that does not react with quartz as a binder. A white paint is applied, and by applying it while heating the end of the pipe, a heat-retaining film with excellent heat retention, binding properties, and chemical stability is formed. An object of the present invention is to provide a method for manufacturing a metal vapor discharge lamp.

As is well known, pig substance solution is made by dispersing 1 to 100 Buddha particles in the solution.In the pig substance solution of metal oxide, many particles are negatively charged and are quickly attached to the surface of other substances. It acts as an adsorbent and also fixes other substances, and has excellent binding properties.

Therefore, among these winning solutions, a white paint using as a binder a pig substance solution in which particles that do not react with the quartz of the arc tube are dispersed becomes an excellent heat-retaining film for metal vapor discharge lamps. below,
The present invention will be explained in detail with reference to examples.

Example 1 An alumina sol prepared by dispersing feather-like alumina particles having an average particle size of 100 mm x 10 mm in water was used as a pig substance solution.

The hydrogen index (pH) of this pork matter solution is 2.5 to 6, and the alumina particles have an extremely high positive charge and have the effect of adsorbing and fixing other particles. The alumina content in the Katsushi solution is about 10% (weight ratio). The white paint was manufactured by first adding the required amount of zirconium oxide with an average powder diameter of 5 mm as a heat-resistant white powder, the required amount of alumina sol, and mixing them with water to make a white coating amount.

According to the inventor's experiments, a good product suitable for a heat-retaining film was obtained over a very wide range of mixing ratios of zirconium oxide, alumina sol, and water. The range confirmed in the experiment was as follows, assuming zirconium oxide as 100 yen.
By applying this, it was possible to form an excellent heat retaining film. Zirconium oxide 10
0ta alumina sol (alumina content 10%) 20~20
0 evening water 50-1000 evening However, when applying this white paint to the tube end of a quartz arc tube, it is clear that if it is simply applied with a brush, etc., it is likely to dry from the surface of the coating and cause cracks to occur in the painted area. It became.

In order to apply crack-free coating, it is necessary to dry the coated area from the inside, and to accomplish this, the above white paint was sprayed while the tube end was heated with a burner to approximately 100 qo or more. As a result, it was confirmed that the sprayed paint dries at the same time as it is sprayed, and that even if it forms a heat-retaining film as thick as one skin, it has excellent adhesion and binding properties with no visible cracks. . The heat insulating film thus obtained is made of zirconium oxide and alumina, both of which are heat resistant and do not react with the arc tube quartz even at high temperatures. Although the above example shows a method of coating while heating with a burner, heating may be performed by a heater, or heating may be performed by lighting a heat generating tube at low input.

Infrared heating may also be used. Example 2 Alumina with an average particle size of 5 mm was used as a heat-resistant white powder.

The mixing ratio of the white paint is as follows. alumina
100 Yumi Alumina Sol (alumina content 10%) 20~200 Yumizu 50~10002 The method of applying it to the end of the arc tube is to spray it while heating as described above, and it has excellent heat retention with no cracks and good adhesion. A membrane was obtained.

The heat retaining film thus obtained is a heat retaining film consisting of a single composition of alumina. Example 3 A silica sol prepared by dispersing silica having a particle size of 10 to 20 degrees in water was used as a pork substance solution.

The silica particles have a siloxane structure and are negatively charged, the hydrogen index (pH) of the pork matter solution is 9 to 10, and the content of silicic anhydride is about 20% by weight. Since it has a silanol group on the surface of the siloxane bond and is negatively charged, its binding value for adsorbing and fixing other particles is extremely strong. In the experiment, a white paint was made with the following mixing ratio.

Zirconium oxide 100 silica sol (silica content 20%) 10-100 polyhydric
It took 50 to 500 minutes to apply the white paint to the quartz arc tube by spraying it while heating the end of the arc tube, as described above, and was able to create a heat-retaining film with good cohesion and no cracks. The heat-retaining film thus obtained is made of zirconium oxide and silica, and does not react with quartz even at high temperatures, making it a good heat-retaining film. As explained above, according to the present invention, a heat-retaining film for an arc tube of a metal vapor discharge lamp is formed by applying a white paint using a heat-resistant white powder and a pig substance solution of a metal oxide as a binder while heating. showed that.

Claims (1)

[Claims] 1. A heat-retaining film is formed by applying a white paint consisting of a heat-resistant white powder that does not react with quartz and a colloidal solution (sol) of metal oxide that does not react with quartz to the end of a quartz arc tube while heating it. A method for manufacturing a characteristic metal vapor discharge lamp.