JPH0330264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing an incandescent light bulb having a translucent infrared reflective coating on a translucent glass bulb.

[Technical background of the invention]

In an incandescent light bulb equipped with a light source assembly having, for example, a tungsten coil filament on the central axis within a light-transmitting glass bulb, the light-transmitting glass bulb is provided with a coating that reflects infrared rays, so that the light emitted from the tungsten coil filament of the incandescent light bulb is provided with a coating that reflects infrared rays. There are commercially available light sources that efficiently radiate light and are suitable for the modern energy-saving era.Since such light sources emit almost no infrared rays, they have the effect of suppressing the deterioration and high temperature of the irradiated object due to infrared irradiation. There is also. It is known that such light-transmitting glass bulbs for incandescent light bulbs have their surfaces treated as described below. () For example, a thin film of a substance with a low refractive index such as magnesium fluoride or silicon oxide is deposited on the surface of a transparent glass bulb by vacuum evaporation, and then a thin film of a substance with a low refractive index such as zinc sulfide or titanium oxide is applied on top of A thin film of a substance with a refractive index is deposited by a vacuum evaporation method, and a plurality of thin films of the above-mentioned low refractive index substance and thin films of a high refractive index substance are deposited alternately to reflect infrared rays, () For example, a metal thin film that has a high reflectance in a wide range of wavelengths, such as a silver thin film, or a thin film made by sandwiching the above thin film with a thin film of a material with a high refractive index such as titanium oxide, is used to transmit light using a vacuum evaporation method or a sputtering method. materials with a stoichiometric composition such as stannic oxide, ammothine-stannic oxide, indium oxide, indium oxide-stannic oxide, etc. A thin oxide film that forms an n-type semiconductor is deposited on the surface of a transparent glass bulb by vacuum evaporation, sputtering, chemical, paper, deposit, spray, etc. There are those that reflect () and those that combine the above () and ().

[Problems with background technology]

The shape of the transparent glass bulb of an incandescent light bulb is as follows: The transparent glass bulb has a coating that reflects infrared rays.
A cylindrical shape called a T-shape, a spherical shape called a G-shape, or a pear-shape called a PS shape are used, and there are various inner diameter dimensions. Therefore, the method of forming an infrared reflective coating as described in the technical background of the invention uses a vacuum evaporation method, a sputtering method, etc., and is basically a batch method. Because there are various shapes and dimensions of glass bulbs, it is difficult to apply a multiple layer coating consisting of a pair of low refractive index and high refractive index metal oxide thin films with uniform film thickness. When mass producing such incandescent light bulbs, there was a problem that became a major technical and economical obstacle.

In addition, the multi-layered coating of an incandescent light bulb manufactured by the conventional method as described above may have areas where the infrared reflective ability is functionally reduced;
There was also the problem that the film easily peeled off.

[Purpose of the invention]

The present invention has been made in view of the problems of the background art described above, and it is an incandescent light bulb in which a coating that reflects infrared rays is provided on the surface of a translucent glass bulb, and it is an object of the present invention to mass produce the infrared reflective coating. It is relatively easy both technically and economically, and the produced incandescent light bulb has a good infrared blocking effect, and problems such as peeling of the infrared reflective coating are less likely to occur.
It is an object of the present invention to provide an improved method for manufacturing an incandescent light bulb, which can produce an incandescent light bulb having a film with a uniform thickness and less deterioration of the film.

[Summary of the invention]

The present invention comprises a light-transmitting glass bulb and a light source assembly having a tungsten coil filament provided in the light-transmitting glass bulb, and the light-transmitting glass bulb has a metal oxide with a low refractive index on its surface. In the production of a product having a coating consisting of a metal oxide coating formed by depositing a plurality of layers consisting of a thin film and a metal oxide thin film having a high refractive index and a coating consisting of an n-type semiconductor, the above-mentioned low refractive index A method for manufacturing an incandescent light bulb, comprising a step of forming at least one of a metal oxide thin film, a high refractive index metal oxide thin film, and an n-type semiconductor coating by thermal decomposition of an organometallic compound.

[Embodiments of the invention]

An embodiment of the manufacturing method of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a partially cutaway front view of an example of an incandescent light bulb manufactured by an embodiment of the manufacturing method of the present invention, and FIG. 2 is an enlarged sectional view of the cutout portion of the incandescent light bulb.

The transparent glass bulb 1 includes, for example, a light source assembly having a tungsten coil filament (not shown) on its central axis.

A base 2 is attached to the end of the translucent glass bulb 1.
are bonded together with base cement, and lead wires led out from the light source structure are attached to shell 3 and eyelet 4 of base 2, and shell 3 and eyelet 4 are insulated by eyelet glass 5. forming a terminal. The transparent glass bulb 1 has six layers deposited on its outer surface, each consisting of a pair of a titanium oxide metal oxide thin film 6 with a high refractive index and a silicon oxide metal oxide thin film 7 with a low refractive index. A metal oxide thin film 8 is deposited, and an n-type semiconductor coating 9 of indium tin oxide (In ₂ O ₃ --Sn) is deposited thereon to form a coating 10 .

Next, the results of experiments conducted by the present inventors will be described.

The present inventors prepared two organotitanium compound solutions containing about 6% by weight of an organotitanium compound and having a viscosity of 1 centipoise, and an organosilicon compound solution containing about 6% by weight of an organosilicon compound and having a viscosity of 1 centipoise.
A seed organometallic compound solution was prepared. The titanium metal oxide has a high refractive index, and the silicon metal oxide has a low refractive index. Next, in the above organic titanium compound solution, the outer diameter is 53 mm, the inner diameter is mm, and the total length is 110 mm.
The outer surface of a translucent glass bulb having the shape shown in 1 in Figure 1 was immersed, pulled up at a speed of 280 mm per minute, dried, pre-fired at 150°C for 30 minutes, and then
Decomposition and firing was performed at 500°C for 1 hour to form a metal oxide thin film of titanium oxide with a high refractive index and a thickness of 1100 mm on the outer surface of the light-transmitting glass bulb. Next, the outer surface of the translucent glass bulb having the titanium oxide metal oxide thin film on the outer surface was immersed in the organosilicon compound solution, pulled up at a speed of 280 mm per minute, dried, and preheated at 150°C for 30 minutes. After firing, decomposition firing was performed at 500°C for 1 hour to form a metal oxide of low refractive index silicon oxide with a thickness of about 1100㎓ on the high refractive index metal oxide thin film of titanium oxide. A layer consisting of a pair of high refractive index and low refractive index metal oxide thin films was formed. By repeating the same method, six layers consisting of a titanium oxide thin film, which is a metal oxide thin film, and an organosilicon thin film, which is a metal oxide thin film of another type, were deposited on top of the titanium oxide thin film. A metal oxide film was formed on the outer surface of a photosensitive glass bulb. Next, 12 layers are applied to the above outer surface in an organometallic compound solution containing about 5% by weight of an organic indium compound and having a viscosity of 1.25 centipoise, and an organotin compound mixed in an organometallic compound solution containing about 10% by weight relative to indium. The surface of a translucent glass bulb with a metal oxide coating is immersed at a rate of 280 per minute.
After pulling and drying at a speed of 1.5 mm, pre-calcination was performed at 150°C for 30 minutes, followed by decomposition firing at 500°C for 1 hour, and then further heated at 450°C for 1 hour in a vacuum of 5 × 10 ^-6 torr. Firing was performed for a time to form an n-type semiconductor layer of indium tin oxide (In ₂ O ₃ --Sn) with a thickness of 1500 mm.

A 100V60W tungsten coil is placed on the central axis of the light-transmitting glass bulb, which is coated with multiple layers of the above metal oxide thin film with a high refractive index and a metal oxide thin film with a low refractive index. An incandescent light bulb was manufactured by a conventional method by sealing the light source assembly so that the filament was located. When the initial characteristics of the incandescent light bulb manufactured by the above-mentioned manufacturing method of the present invention were measured, it was found that approximately 12%
An improvement in the light efficiency was observed, and when the emitted heat rays were measured with a thermoelectric radiometer, it was confirmed that the heat rays were 21% lower than the conventional incandescent bulb.

FIG. 3 shows the spectral transmittance of a flat glass constituting a translucent glass bulb of an incandescent light bulb manufactured by the manufacturing method of the present invention, in which an infrared reflective coating according to the manufacturing method of the present invention is coated, and the horizontal axis represents the wavelength. This is a spectral transmittance curve diagram showing the above spectral transmittance on the vertical axis, and shows the transmittance of each wavelength of the flat glass constituting the translucent glass bulb without the above infrared reflective coating coated on the surface. When set to 100, the specific transmittance of each wavelength of the flat glass with the above coating is %
It is shown.

As is clear from FIG. 3, the specific transmittance decreases to about 50% or less in the infrared region of 810 nm or more. It should be noted that the spectral transmittance in the visible range may be slightly lower for those with the coating produced by the manufacturing method of the present invention than those without, but as mentioned above, the reason why the light efficiency improves is that the spectral energy of infrared rays increases. Since the radiation outside the translucent glass bulb is suppressed, its partial effect increases the temperature of the tungsten coil filament by around 10%, which reduces the input power and improves the light efficiency. be. Note that the number of layers consisting of pairs of high and low refractive index metal oxide thin films can be increased or decreased depending on the required functions of the incandescent lamp.

The high and low refractive index metal oxide thin films and n-type semiconductor coatings that are deposited on the surface of the transparent glass bulb of the incandescent light bulb manufactured by the manufacturing method of the present invention are formed by thermal decomposition of organometallic compounds. An experimental example was shown in which at least one of the three types of high and low refractive index metal oxide thin films and n-type semiconductor films was used.
The effects of the present invention can be effectively exhibited if the seeds are formed by thermal decomposition of an organometallic compound.
Moreover, thin films and coatings can be formed at relatively low temperatures, and unlike vacuum evaporation or sputtering methods, uniform thin films can be easily formed even when the transparent glass bulb has a variety of shapes. . Furthermore, the order in which the low refractive index thin film and the high refractive index thin film are deposited is not limited to the example.

In addition, in the example, an example was explained in which a metal oxide thin film and an n-type semiconductor coating were deposited on the outer surface of a light-transmitting glass bulb. Good too.

Furthermore, the effects of the present invention do not change even if the tungsten coil filament is not located on the central axis of the light-transmitting glass bulb.

The metal oxide thin film used in the present invention includes zirconium, titanium, cerium, neodymium, antimony, praseodymium, magnesium, silicon,
By using an oxide such as aluminum, combining a high refractive index metal oxide and a low refractive index metal oxide into a pair, and at least one of tin, indium, titanium, etc. as an n-type semiconductor coating. The same effects as in the embodiments can be obtained by using the semiconductor film as the main component.

〔Effect of the invention〕

As described in detail above, the present invention includes a light-transmitting glass bulb and a light source assembly having a tungs coil filament provided in the light-transmitting glass bulb, and the light-transmitting glass bulb has a light-transmitting material on its surface. A plurality of layers consisting of a pair of a metal oxide thin film with a refractive index and a metal oxide thin film with a high refractive index are deposited,
In the production of a product having a coating consisting of a metal oxide thin film and an n-type semiconductor coating, at least one of the above-mentioned low refractive index metal oxide thin film, high refractive index metal oxide thin film, and n-type semiconductor coating is used. A method for manufacturing an incandescent light bulb, characterized by comprising a step of forming it by thermal decomposition of an organometallic compound, the incandescent light bulb having a coating such as an infrared reflective coating on the surface of a transparent glass bulb, which has a high refractive index. Since at least one of a metal oxide thin film, a low refractive index metal oxide thin film, and an n-type semiconductor film is formed by thermal decomposition of an organometallic compound, a uniform thin film can be easily formed, and therefore mass production is possible. Moreover, the manufactured incandescent lamp can efficiently block infrared rays, and has the effect that it is possible to provide an improved method for manufacturing an incandescent lamp with less occurrence of peeling of the infrared reflective coating. .

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an example of an incandescent light bulb manufactured by the manufacturing method of the present invention, FIG. 2 is an enlarged sectional view of the cutout of the incandescent light bulb, and FIG. 3 is a translucent view of the incandescent light bulb. FIG. 2 is a spectral transmittance curve diagram of an infrared reflective coating formed on the surface of a flat glass constituting a transparent glass bulb. 1...Transparent glass bulb, 6...High refractive index metal oxide thin film, 7...Low refractive index metal oxide thin film, 9...N-type semiconductor coating.

Claims (1)

[Claims] 1 Comprising a light-transmitting glass bulb and a light source assembly having a tungsten coil filament provided in the light-transmitting glass bulb, the light-transmitting glass bulb having a high refractive index metal oxide thin film on its surface. In the production of a product having a coating consisting of a metal oxide coating formed by depositing a plurality of layers consisting of a pair of a low refractive index metal oxide thin film and an n-type semiconductor coating, the above-mentioned high refractive index metal A method for producing an incandescent light bulb, comprising the step of forming at least one of an oxide thin film, a low refractive index metal oxide thin film, and an n-type semiconductor coating by thermal decomposition of an organometallic compound.