JPH05166496A - Electric bulb - Google Patents

Abstract

PURPOSE:To provide an electric bulb of which the heat radiation to the outside is decreased to improve the efficiency. CONSTITUTION:An incandescent body 1 is accommodated in an inner tube 5 in which a gas is sealed. The incandescent body 1 is provided, over a substantially whole surface thereof, with a number of cavities whose opening dimension is very small to such an extent as to cut off the light rays of a wavelength region in which the wavelength is equal to or longer than a specified wavelength. An inner tube 5 is accommodated within an outer tube 6, a space between the tubes 5 and 6 being kept in vacuum. This almost zeroes the heat conduction between the two and therefore reduces the heat loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention provides a large number of fine cavities that open on the surface of an incandescent body.
The present invention relates to a light bulb in which the wavelength range of light emitted from an incandescent body is limited.

[0002]

2. Description of the Related Art Generally, 7 out of the total energy input to a tungsten filament used in an incandescent lamp is used.
2% becomes infrared, the energy of visible light is about 10%, and the remaining 18% is heat loss, so that the incandescent light bulb has a problem that the luminous efficiency is poor. The heat loss here is the heat energy lost due to convection and heat conduction of the gas sealed in the valve and heat conduction of the lead-in wire connecting the filaments.

As an electric light bulb for solving such a problem, it is considered to use an incandescent body 1 having a large number of fine cavities 2 opened on the surface thereof instead of a filament as shown in FIG. -102701 gazette). That is, as shown in FIG. 3, the incandescent body 1 supported by the lead-in wire 3 is housed in a valve 4 filled with gas. This incandescent body 1 is an application of the quantum electromagnetic mechanical effect of significantly reducing the existence probability of photons having a predetermined energy or less by limiting the radiation field of light in the cavity 2 and having a predetermined wavelength or more. There is an effect that it is possible to block light in the wavelength region of.
If the effect of the cavity 2 is interpreted from a classical physical point of view, it can be considered that the cavity 2 is regarded as a waveguide with a low degree of tuning so that light in the wavelength region of the cutoff wavelength or more is not transmitted. If the opening of the cavity 2 is formed in a square shape, it is possible to extract only light in a wavelength region of a wavelength that is about twice the length of one side of the cavity 2 or less. Therefore, if the dimensions of the cavity 2 are set so as to suppress the radiation in the infrared region, the infrared rays will be 10% or less of the input energy, and the light emission efficiency will be significantly reduced as compared with the case of using a filament. ..

[0004]

By the way, if the incandescent body 1 having the fine cavity 2 as described above is used instead of the filament, the emission of infrared rays is suppressed, but the heat loss is the same as that of the conventional light bulb. As it occurs, 60% of the input energy is heat loss and 30% is visible light. After all, the ratio of heat loss becomes relatively large, and there is a problem that the input / output efficiency cannot be sufficiently increased. In particular, in the incandescent body 1 having the cavity 2, the cavity 2 is lost when the surface of the incandescent body 1 evaporates. Therefore, in order to suppress the evaporation of the incandescent body 1, a high-pressure rare gas is sealed inside the valve 4. Or the surface temperature of the incandescent body 1 is relatively low (2100
K or less). When a high-pressure rare gas is enclosed in the valve 4, convection and heat conduction are likely to occur, resulting in increased heat loss. Also, when the surface temperature of the incandescent body 1 is set to a relatively low temperature, the amount of emitted light decreases. This reduces the relative proportion of light output to heat loss.

The present invention is intended to solve the above problems, and an object thereof is to provide a light bulb with reduced heat loss and improved input / output efficiency.

[0006]

In order to achieve the above-mentioned object, in the invention of claim 1, a large number of cavities that are opened in a fine dimension so as to block light in a wavelength range of a predetermined wavelength or more are formed on the surface. It has an incandescent body formed over the entire surface, an inner tube containing a gas and containing an incandescent body, and an outer tube containing the inner tube inside, and is formed between the inner tube and the outer tube. The space is made vacuum.

According to a second aspect of the invention, in addition to the first aspect of the invention, an infrared reflecting film for reflecting infrared rays emitted from the inside is provided on substantially the entire circumferential surface of the outer tube.

[0008]

According to the structure of claim 1, since a large number of fine cavities are formed on the surface of the incandescent body, if the opening size of the cavities is appropriately set, the light output in the infrared region can be suppressed and the total light output can be reduced. The ratio of visible light can be increased. Further, since the incandescent body is housed in the inner tube filled with gas and the inner tube is housed in the outer tube, the space formed between the inner tube and the outer tube is evacuated,
There is almost no heat conduction between the inner and outer pipe walls, and the heat generated in the inner pipe hardly escapes to the outside. As a result, the heat loss is greatly reduced, and the ratio of visible light energy to input energy is significantly increased. For example, the energy of visible light with respect to the input energy can be 60%, the energy of infrared light can be 10%, and the heat loss can be 30%. Therefore, the efficiency can be doubled as compared with the conventional one. it can. Moreover, the surface of the inner tube has high temperature due to heat conduction from the incandescent body, but since the surface of the outer tube is kept at a relatively low temperature, there is no risk of burns and the like, and it is safe. Heat resistance is not required for the reflector and the like, which leads to cost reduction.

According to the structure of claim 2, since the infrared reflecting film for reflecting the infrared rays radiated from the inside is provided on substantially the entire circumferential surface of the outer tube, the thermal energy released by the radiation to the outside air is reduced. Therefore, the heat loss can be further reduced.

[0010]

【Example】

(Embodiment 1) In this embodiment, as shown in FIG. 1, a double pipe composed of an inner pipe 5 and an outer pipe 6 is provided, and a rare gas is sealed inside the inner pipe 5. Here, the inner tube 5 is supported so as to form a space between the inner tube 5 and the tube wall of the outer tube 6 by being coupled to a stem or the like that supports the lead-in wire 3. The space formed between the inner pipe 5 and the outer pipe 6 is kept in a vacuum, and the pipe walls of the inner pipe 5 and the outer pipe 6 are thermally insulated. Inside the inner tube 5, a tungsten incandescent body 1 having a large number of cavities 2 (see FIG. 4) formed on its surface is housed. The incandescent body 1 is connected to the base 7 through the lead-in wire 3. The inner tube 5 is made of heat-resistant glass or the like, and the outer tube 6 is made of ordinary glass or transparent synthetic resin.

According to the above construction, the heat generated from the incandescent body 1 is transferred to the tube wall of the inner tube 5 by the heat conduction by the enclosed gas, but the space between the inner tube 5 and the outer tube 6 is vacuum. As a result, it is hardly transmitted to the tube wall of the outer tube 6. Therefore, the heat energy radiated to the outside is greatly reduced and the heat loss is reduced. Although the mouthpiece 7 is a single mouthpiece shape, it may be a double mouthpiece shape in which mouthpieces are provided at both ends of the outer tube 6, and the shape of the inner tube 5 and the outer tube 6 is not limited to a spherical shape, such as an eggplant shape or a cylindrical shape. A shape may be adopted. The other configurations are the same as those of the light bulb described in the section of the related art, and thus the description is omitted.

(Embodiment 2) In this embodiment, as shown in FIG. 2, an infrared reflecting film 8 for reflecting infrared rays emitted from the inside is provided over substantially the entire circumference of the tube wall of the outer tube 6. It is a thing.
The infrared reflection film 8 may be provided on either the inner peripheral surface or the outer peripheral surface of the tube wall of the outer tube 6. With this configuration, it is possible to reduce the heat energy released to the outside by radiation,
The heat loss can be further reduced as compared with the first embodiment. The other configurations are similar to those of the first embodiment, and thus the description thereof is omitted.

[0013]

According to the invention of claim 1, the incandescent body is housed in the inner tube, the inner tube is housed in the outer tube, and the space formed between the inner tube and the outer tube is evacuated. Since there is almost no heat conduction between the tube walls of the inner tube and the outer tube, there is an effect that the heat loss is reduced. That is, the ratio of the energy of visible light to the input energy can be increased, and the input / output efficiency is significantly improved.

According to the second aspect of the present invention, since the infrared reflecting film for reflecting the infrared rays radiated from the inside is provided on substantially the entire circumferential surface of the outer tube, the heat energy released to the outside air by radiation is reduced, and There is an advantage that the loss can be further reduced.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a front view of the second embodiment.

FIG. 3 is a front view of a conventional example.

FIG. 4 shows a heating element used in the light bulb according to the present invention,
(A) is a plan view of a main part, and (b) is a cross-sectional view of the main part.

[Explanation of symbols]

 1 incandescent body 2 cavity 5 inner tube 6 outer tube 8 infrared reflective film

Claims (2)

[Claims] 1. An incandescent body formed by forming a large number of cavities, which are opened in a fine size so as to block light in a wavelength region of a predetermined wavelength or more, over substantially the entire surface, and an incandescent body filled with gas inside. A light bulb, comprising: an inner tube housed in an inner tube; and an outer tube housed in the inner tube, wherein a space formed between the inner tube and the outer tube is evacuated. 2. The light bulb according to claim 1, wherein an infrared reflection film for reflecting infrared rays emitted from the inside is provided on substantially the entire circumferential surface of the outer tube.