JPH05290727A - Formation of diffusing film for bulb - Google Patents

Abstract

PURPOSE:To improve the luminous flux value of a spherical lamp by forming a white color diffusing film using a suspension prepared by dispersing calcium carbonate, which is a white color pigment, in a water-soluble emulsion and a solution of a nonionic surfactant. CONSTITUTION:In the case a diffusing film for a spherical lamp is formed using a white color pigment, calcium carbonate is used as the white color pigment and the pigment is mixed with an emulsion of silica-acryl composite particles, an aqueous solution of a nonionic surfactant, and deionized water and stirred to prepare a suspension. Then, the suspension is applied to the innser side of a spherical glass globe and dried by warm wind to form the diffusing film. The body color of the white color pigment is bluish white and absorption of radiated light by the diffusing film is a little. Using calcium carbonate as a white color pigment of the white color diffusing film in this way, the luminous flux value of the lamp is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a diffusion film for a bulb, and more particularly to a method for forming a white diffusion film on the inner surface of a glass globe of an electric bulb type fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, fluorescent lamps have higher lamp efficiency than incandescent light bulbs, and therefore, not only in factories and shops,
It has also been used in large quantities at home. However, most fluorescent lamps have a linear or annular shape, which makes them larger than light bulbs, and requires a ballast and lighting tube, which makes the overall size of the fixture large. thing,
It has problems such as complicated handling. In recent years, for the purpose of solving such problems and saving power, a fluorescent tube is molded into a U shape or a double U shape and integrated with a lighting circuit in a glass globe, and a bulb cap A bulb-type fluorescent lamp having the following has been proposed. In this case, a diffusion film made of a white pigment or the like is formed on the inner surface of the glass globe so that the light from the fluorescent lamp is uniformly diffused. Conventionally, as this white pigment, for example, calcium phosphate, barium carbonate, a mixture of zircon silicate and aluminum silicate is used,
This is applied to the inner surface of the glass glove using a binder, for example, a suspension prepared by dispersing it in an organic solvent containing nitrified cotton, or an aqueous suspension containing a binder composed of a water-soluble polymer resin. Then, it was dried to form a white diffusion film.

[0003]

However, in the diffusion film using the conventional white pigment as described above, since the powder of the white pigment itself has a dark body color, the light from the fluorescent tube is There is a problem in that the light is absorbed and the transmittance is deteriorated, and thus the luminous flux of the lamp is reduced.

The present invention has been made in order to solve such a problem, and provides a method for forming a diffusion film for a tube that can obtain a desired luminous flux value with less absorption of light from a fluorescent tube or the like. To do.

[0005]

In the method for forming a diffusion film for a bulb of the present invention, calcium carbonate is used as a white pigment, and the white pigment is dispersed in a water-soluble emulsion resin and a nonionic surfactant. The suspension is applied to the inner surface of the glass glove and dried.

[0006]

The body color of the white pigment used in the method of the present invention is bluish white, and the light emitted from the fluorescent tube is hardly absorbed by the diffusion film. Therefore, according to the present invention, the luminous flux is improved as compared with the conventional glass globe in which the diffusion film using the white pigment is formed.

[0007]

EXAMPLES Examples of the present invention will be described below in comparison with conventional examples.

Example Calcium carbonate (trade name: Calcigross) 1000 g Silica acrylic composite particle emulsion (40% concentration) 1000 g Nonionic surfactant (10% concentration aqueous solution) 10 cc Deionized water 175 cc After stirring, the suspension is compounded through a 300 mesh screen. Next, using this suspension, a coating amount of 1000 mg was applied to the inner surface of a spherical glass globe having an inner diameter of 95 mm and dried to form a white diffusion film. Drying was performed by blowing warm air at 70 ° C. and an air volume of 0.5 l / sec into the glass globe for about 3 minutes. Double U of 17 watts inside a glass globe with a diffusion film
A compact fluorescent tube was assembled with a lighting circuit, and a bulb-shaped fluorescent lamp was manufactured by the usual method.

Conventional Example 1 Calcium phosphate 1000 g Silica-acrylic composite particle emulsion (40% concentration) 1000 g Nonionic surfactant (10% concentration aqueous solution) 10 cc Deionized water 170 cc The above materials were processed in the same manner as in the above examples. As a suspension, apply 1000 on the inner surface of a spherical glass globe with an inner diameter of 95 mm.
mg was coated and dried to form a white diffusion film, and a 17-watt double U-shaped fluorescent tube was incorporated in a glass globe together with a lighting circuit, and a bulb-shaped fluorescent lamp was manufactured by a usual method.

Conventional Example 2 Barium carbonate 1000 g Silica-acrylic composite particle emulsion (40% concentration) 1000 g Nonionic surfactant (10% concentration aqueous solution) 10 cc Deionized water 70 cc The above materials were put in a ball mill pot and ball-milled for 6 hours. It was After completion of the ball mill, the suspension is prepared by passing through a 300 mesh sieve. Using the prepared suspension, a coating amount of 1000 mg was applied to the inner surface of a spherical glass globe having an inner diameter of 95 mm and dried to form a white diffusion film. Drying was performed by blowing warm air at 70 ° C. and an air volume of 0.5 l / sec into the glass globe for about 3 minutes. A 17-Watt double U-shaped fluorescent tube was installed together with a lighting circuit in a glass globe on which a diffusion film was formed, and a bulb-shaped fluorescent lamp was manufactured by a usual method.

Conventional Example 3 Zircon silicate 200 g Aluminum silicate 800 g Silica acrylic composite particle emulsion (40% concentration) 1000 g Nonionic surfactant (10% concentration aqueous solution) 10 cc Deionized water 100 cc As a suspension by the method described above, apply 100 on the inner surface of a spherical glass glove with an inner diameter of 95 mm.
0 mg was applied and dried to form a white diffusion film, and a 17-watt double U-shaped fluorescent tube was incorporated in a glass globe together with a lighting circuit, and a bulb-shaped fluorescent lamp was manufactured by an ordinary method.

Table 1 shows the results of the initial luminous flux and the luminous flux maintenance factor after lighting for 6000 hours in the examples of the present invention and the conventional examples 1 to 3.

[0013]

[Table 1]

As is clear from Table 1, the lamp of the embodiment of the present invention has an initial luminous flux of 0.
It can be seen that the luminous flux maintenance ratio is improved by 6 to 1.5%, and the luminous flux maintenance ratio is equal to or higher than that of the conventional examples 1 to 3 even after the lighting of 6000 hours. It was also confirmed that good results were obtained in that the diffusion film did not drop out of the glass globe and the diffusion film did not discolor after lighting for 6000 hours.

[0015]

As described above, according to the present invention, by using calcium carbonate as the white pigment of the white diffusion film formed on the inner surface of the glass globe, the luminous flux value of the lamp can be improved more than before. It is possible to provide a method for forming a diffusion film for a sphere.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsunetaka Araki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.

Claims (1)

[Claims] 1. Calcium carbonate is used as a white pigment,
A method for forming a white diffusion film for a tube, comprising applying a suspension prepared by dispersing the white pigment in a water-soluble emulsion resin and a nonionic surfactant onto the inner surface of a glass globe and drying the suspension.