JP2001313005A - Infra-red light bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infra-red light bulb with a sintered compact of a carbon system material as a heating element, hardly susceptible to contamination and easy to be detached. SOLUTION: A block having thermal resistance and conductivity is bonded at both ends of a round-bar or flat-sheet heating element, by way of a sintered compact made of carbon based material, and the block is fixed with inner lead wires in dense insertion coupling. To the inner lead wires are bonded molybdenum foils, at the other end of which outer lead wires are bonded, which are then inserted in a transparent quartz glass tube to make up an infra-red light bulb. One or a plurality of these infra-red light bulbs are sealed into a transparent heat-resistant glass tube with one end sealed, from the other end of which, outer lead wires are guided out to make up a double-tube structure infra-red light bulb.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared light bulb used as a heat source for heating, cooking, drying and the like.

[0002]

2. Description of the Related Art As a conventional infrared light bulb which emits near-infrared rays or far-infrared rays and is used as a heat source, a Colts lamp, a halogen lamp, a nichrome wire heater or a metal resistance wire is inserted into a stainless steel tube and inserted into a gap. There is a sheath heater packed with an inorganic powder having heat resistance and insulating properties. In the Colts lamp and the halogen lamp, a tungsten spiral filament is held at a central portion in a quartz glass tube, and an inert gas is sealed therein to seal both ends. Generally, a Coltz lamp uses argon gas as an inert gas, and a halogen lamp generally uses argon gas to which a small amount of halogen gas is added. The emissivity of tungsten used in Colts lamps and halogen lamps is as low as 0.4 to 0.5. The tungsten spiral filament has a large rush current, and a rush current of about 10 times the rated current flows at the moment of the start of energization. Therefore, there is a problem that it is difficult to design a control circuit. Further, noise may be generated by a large inrush current, which may affect peripheral devices. Furthermore, a large number of tungsten supports had to be used to hold the tungsten spiral filament in the center of the quartz glass tube, and its assembly was not easy. Nichrome wire heaters and sheathed heaters have a small inrush current, but it takes a long time of 1 to 5 minutes for the heater to glow red, and there is a problem with rapid heating.

In order to solve these problems, an infrared light bulb has been developed in which a sintered body of a carbon-based material formed into a rod or plate is used as a heating element instead of a conventional tungsten spiral filament. Since the emissivity of the carbon-based substance used in the infrared light bulb is 0.85, which is higher than that of tungsten, the infrared emissivity of the infrared light bulb is also high. Since the carbon-based material has a slightly negative or positive temperature resistance characteristic indicating the relationship between temperature and resistance, the inrush current at the start of lighting is small and the control circuit may be simple. Since the inrush current is small, there is no effect on peripheral devices. Hereinafter, a conventional infrared light bulb will be described in detail with reference to FIG. FIG. 11A shows a front view, and FIG. 11B shows a side view. In FIG. 11, a heating element 1 made of a carbon-based material having a rectangular cross section and formed in a vertically long plate shape.
Are inserted into a transparent quartz glass tube 2. Terminals 3-1, 3-2 made of a material having heat resistance and electrical conductivity, for example, graphite, are joined to both ends of the heating element 1. The terminals 3-1 and 3-2 are partially connected to the spiral portions 5-1 and 5-
2 of the internal lead wires 6-1 and 6-2
1, 4-2 are connected by tight fitting. One ends of molybdenum foils 7-1 and 7-2 are connected to the other ends of the internal lead wires 6-1 and 6-2, respectively. Molybdenum lead wires 12-1 and 12-3 are respectively welded to the other ends of the molybdenum foils 7-1 and 7-2. The ends 9-1 and 9-2 of the quartz glass tube 2 including the molybdenum foils 7-1 and 7-2 are melted, crushed into a flat plate shape, and sealed. An inert gas such as an argon gas is sealed in the quartz glass tube 2.

[0004]

An infrared light bulb using the above-mentioned conventional heating element made of a carbon-based material includes a lead wire 12-1 and a lead wire 12-1.
Since 12-3 is exposed at both ends, the length of the electric wire may be increased during wiring. Infrared light bulbs can be used underwater, in oil,
Or if you want to immerse in various solutions and directly heat the solution,
In order to ensure insulation of the lead wires 12-1 and 12-3, a large-scale structure is required and the cost increases. When an infrared light bulb is used for heating food, it can be heated in a short time due to a high far-infrared emission rate, and the taste of the food is good. However, contamination of the infrared light bulb by oil or salt scattered from the object to be heated cannot be avoided. In particular, when the quartz glass 2 is used in a state where salt is adhered, a devitrification phenomenon occurs in the quartz glass 2 due to an alkali component, and the heating efficiency is reduced, and in the worst case, the quartz glass tube 2 may be damaged. An object of the present invention is to provide a low-cost infrared light bulb in which the above-mentioned problems have been solved.

[0005]

According to the present invention, there is provided a dual tube infrared light bulb having a round body or a flat heating element made of a sintered body made of a carbon-based material, and a heat-resistant body joined to both ends of the heating element. , A metal wire attached at one end to the terminal by close fitting, a spring-like internal lead wire made of a metal plate or a stranded wire, the above-mentioned internal lead wire and the like. A molybdenum foil having one end joined to an end, an external lead wire joined to the other end of the molybdenum foil, the heating element, a terminal, an internal lead wire, and a molybdenum foil are inserted inside and filled with an inert gas. An infrared light bulb having a transparent quartz glass tube fused and sealed with the molybdenum foil portion, and at least one of the infrared light bulbs therein, and a terminal of the infrared light bulb is led out from one end. And sealed transparent With febrile glass tube. According to the present invention, since the infrared light bulb has a double tube structure in which the infrared light bulb is sealed in a transparent heat-resistant glass tube, the surface of the infrared light bulb is not contaminated. Since the external lead wire has a structure led out from one side of the transparent heat-resistant glass tube, it is suitable to be used by putting parts other than the lead wire lead part into the solution,
Wiring is easy, and the degree of freedom in designing the device is greatly increased.

In a dual tube infrared light bulb according to another aspect of the present invention, the infrared light bulb enclosed in the transparent quartz glass tube is:
A structure is adopted in which both ends of the infrared light bulb are fixed with metal plates so as to be located substantially at the center of the transparent heat-resistant glass tube. Thus, the infrared light bulb can be fixed in the transparent heat-resistant glass tube with a simple structure. The metal plate has a structure in which both ends are bent, and the bent portion holds the infrared light bulb substantially in the center of the transparent heat-resistant glass tube. Since the bent metal plate portion is in contact with the inner wall of the outer glass tube, the inner infrared light bulb can be easily arranged at the center of the tube. Also,
Since the metal plate has a spring property, even if vibration or impact is applied, the metal plate absorbs the vibration, and a double-tube infrared lamp that is strong against vibration and impact can be realized. Since the metal plate is connected and fixed to the external lead-in line, the infrared light bulb inserted therein can be easily fixed in the glass tube, and a highly reliable infrared light bulb having a double tube structure can be realized.

According to another aspect of the present invention, there is provided a double-tube infrared lamp in which one or more infrared lamps are sealed in a transparent heat-resistant glass tube. The two ends of the infrared light bulb may be fixed by a metal plate or a ceramic plate having a diameter slightly smaller than the inner diameter of the transparent heat-resistant glass tube so as to be located substantially at the center of the transparent glass tube. At this time, the fusion-sealed portion of the infrared light bulb is inserted and fixed in the opening of the plate made of metal or ceramic. Due to the metal or ceramic plates at both ends, heat generated during the heat generation is not radiated to the ends of the heating element. That is, it functions as a heat shield plate of the external lead wire lead-out part, and can suppress the temperature rise of the lead-out part, thereby realizing a highly reliable infrared light bulb having a double tube structure.

In another aspect of the present invention, there is provided a dual-tube infrared light bulb having one end of an external lead wire extending from one end of the transparent heat-resistant glass tube and the other end provided on a side surface of a threaded base. Is connected to the metal plate at the center of the insulated base, and the base is joined to the transparent heat-resistant glass tube. If a socket matching the base is mounted on the device side, the double-tube infrared light bulb can be easily mounted or removed, and an infrared light bulb that is easy to handle can be realized. Further, if the socket insertion portion is covered with silicone rubber or the like, a waterproof structure can be easily realized. In the double-tube infrared light bulb, an external lead wire is led out from one end of the transparent heat-resistant glass tube, and one of the external lead wires is insulated on a side surface of a base having a projection on an outer peripheral portion, and the other is insulated. The base is joined to a metal plate at the center of the base, and the base is joined to the transparent heat-resistant glass tube. When inserted into the socket by the protrusion of the base, the direction of the heat generating surface of the heat generating element can be accurately regulated. Replacement of infrared bulbs is simplified.

In another aspect of the present invention, an infrared light bulb having a double tube structure has an external lead wire extending from one end of the transparent heat-resistant glass tube, and the external lead wire is connected to a ceramic base having an insertion pin. And a terminal structure in which the ceramic base is joined to the transparent heat-resistant glass tube. Since the external lead-out portion is composed of a ceramic member and a metal pin and is joined to the transparent heat-resistant glass tube with inorganic cement or the like, it can be used even in a special environment in which the portion is at a high temperature. One or a plurality of infrared light bulbs are inserted into a transparent heat-resistant glass tube having one end sealed, and an external lead wire is collected at the other end and sealed in a double-tube infrared light bulb structure. One of the lead wires of the infrared light bulb sealed in the transparent quartz glass tube has a structure in which the lead wire is connected to the lead wire for external lead-out by a metal wire. The lead wire can be led out to one side with a simple configuration, so that an infrared light bulb having a double tube structure that lights up a plurality of infrared light bulbs independently can be formed.

[0010] In a dual-tube infrared light bulb according to another aspect of the present invention, a plurality of infrared light bulbs are inserted into a transparent heat-resistant glass tube whose one end is sealed, and external lead wires are collected at the other end. In the sealed and sealed infrared light bulb having a double tube structure, the plurality of infrared light bulbs are constituted by infrared light bulbs having different wattages or infrared light bulbs having different lengths. Infrared light bulbs of different wattages are inserted into one double-tube infrared light bulb, and by switching between them, a light bulb of a wide range of wattage can be realized. With the infrared lamps having different tube lengths, a double-tube infrared lamp capable of specifying a place to be heated can be realized. Also, in one infrared bulb,
When the heating element for main heating and the heating element for auxiliary heating are formed, an infrared bulb with a preheating bulb can be provided. A plurality of infrared light bulbs are inserted into a transparent heat-resistant glass tube having one end sealed, and a lead wire for external lead-out is formed at the other end. The infrared light bulbs arranged inside each have a structure that can be turned on independently.

Since a plurality of infrared light bulbs are wired so as to be individually lit, light bulbs of different outputs can be realized with one double-tube infrared light bulb, and an optimum wattage suitable for use conditions. Can be selected. A plurality of infrared light bulbs having a plate-like heating element enclosed in the double-tube infrared light bulb are arranged and inserted so that the plate surfaces of the plate-like heating elements face in the same direction. Since the plate surface portions of the plate-shaped heating element are oriented in the same direction, an infrared light bulb having an extremely different radiation intensity difference between the direction perpendicular to the plate surface and the direction perpendicular to the end surface of the plate can be provided. This makes it possible to realize an infrared light bulb that emits radiated light only in a required direction. It emits uniform radiation over the entire circumference, and its power consumption is about 50% higher than that of conventional Colts, halogen and sheathed heaters. .

[0012] In a dual tube infrared light bulb according to another aspect of the present invention, the cross section of the outer transparent heat resistant glass tube is non-circular. When the cross section has a non-circular, for example, elliptical structure, a compact infrared light bulb with a small occupied area can be realized. In a double-tube infrared light bulb according to another aspect of the present invention, one or more infrared light bulbs are inserted into a transparent heat-resistant glass tube having one end sealed, and an external lead wire is provided at the other end. Collected and sealed, derived 2
In the infrared light bulb having a double tube structure, a reflection film is formed on the inside or outside of the transparent heat-resistant glass tube at a substantially half-circumferential portion behind the infrared light bulb inserted therein. Since the reflecting surface is provided behind the heating element, the radiated light can be radiated in a desired direction, so that the efficiency is high and the energy saving effect is large. Since it hardly emits light except in the emission direction, the temperature rise in that part is small. By providing a reflecting surface at a desired portion according to the shape of the outer transparent heat-resistant glass tube, desired radiated light such as condensed light, parallel light, and divergent light can be obtained.

According to another aspect of the present invention, one or more infrared light bulbs are inserted into a transparent heat-resistant glass tube having one end sealed and externally led out to the other end. In the infrared light bulb having a double tube structure in which lead wires are collected, sealed and led out, air, nitrogen, argon, krypton, or one or more of these are mixed in the transparent heat-resistant glass tube. Gas is sealed. Various gases can be sealed in the transparent heat-resistant glass tube. In addition, infrared light bulbs having different radiated light intensities can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. << First Embodiment >> FIG. 1 is a side sectional view of a double tube infrared light bulb according to a first embodiment of the present invention. In FIG. 1, infrared light bulbs 10-1 and 10-2 in which a heating element 1 made of a carbon-based material is sealed in a transparent quartz glass tube 2 are the same as the infrared light bulbs shown in FIG. Are substantially the same. In FIG. 1, the infrared light bulbs 10-1 and 10-1
-2 is inserted into the transparent heat-resistant glass tube 11 whose upper end is sealed. The upper ends of the infrared light bulbs 10-1 and 10-2 are fixed by, for example, a stainless steel metal plate 15-1. The molybdenum wires 12-1 and 12-2 derived from the infrared light bulbs 10-1 and 10-2 are spot-welded to the molybdenum or stainless steel wire 13 at the connection portions 14-1 and 14-2. The infrared light bulbs 10-1 and 10
-2 is fixed to another metal plate 15-2. The molybdenum wires 12-3 and 12-4 derived from the infrared light bulbs 10-1 and 10-2 are spot-welded to the inner ends of the external lead wires 18-1 and 18-2, respectively. It is desirable to use, as the external lead wires 18-1 and 18-2, a jimet wire having excellent adhesion to the glass of the foot tube 17. External lead wires 18-1, 18
It is desirable to use a copper wire or a constantan wire for the connection portion with the base 21 of -2, and in this case, the dimet wire and the copper or the constantan wire are connected by soldering or welding.

One end of a metal wire, for example, a stainless steel wire 19 is spot-welded at a point 23 to a metal plate 15-2 to which the infrared light bulbs 10-1 and 10-2 are fixed. The other end of the stainless wire 19 is the external lead wire 18
-2 spot welded. The outer ends of the external lead wires 18-1 and 18-2 are connected to foot tubes 17 made of heat-resistant glass.
It is fixed to. The external lead wire 18-1 is connected to a side surface of a base 21 having a screw portion, and the external lead lead 18-2 is connected to a metal plate 22 fixed to the base 21 via an insulating member 24. The base 21 is adhered to the end 11A of the transparent heat-resistant glass tube 11 melt-bonded to the foot tube 17. The above-described double tube infrared light bulb can be produced by basically the same process and method as the incandescent light bulb. For example, in FIG. 1, two infrared light bulbs 1 are placed in a transparent heat-resistant glass tube 11 before the lower end is bent inward.
0-1, 10-2, metal plates 15-1, 15-2, foot tube 1
Insert the assembly containing 7. Next, the transparent heat-resistant glass tube 1
1 is heated and bent inward, and the foot tube 17
Weld to. Finally, the base 21 is bonded to the foot pipe 17, and the external lead wires 18-1 and 18-2 are connected to the base 21 to complete the connection.

FIG. 2 shows an infrared light bulb 10- in FIG.
II-II of metal plate 15-1 part fixing 1, 10-2
It is sectional drawing. In FIG. 2, the metal plate 15-1 is a fusion-sealed end 9-1 of the infrared light bulbs 10-1 and 10-2.
Metal plates 30, 3 formed into a shape similar to the cross-sectional shape of
1 and 32 are joined by spot welding. At both ends of the metal plate 30, bent portions 33 and 34 that are in contact with the inner wall of the transparent heat-resistant glass tube 11 are provided. Metal plate 3
As the material of No. 0, other than stainless steel, a material that can be spot-welded, such as iron and nickel, can be used. When stopping with screws, materials such as aluminum and brass can also be used. Tungsten glass was used as the transparent heat-resistant glass tube 11, but is not limited thereto.
The material is not limited as long as it is transparent or translucent glass. A material that transmits light near the wavelength of 1 to 5 μm in the far infrared region is optimal. Quartz glass is one of the most suitable materials.

In this embodiment, two infrared light bulbs are used.
Although the double-bulb structure infrared light bulb has been described, a configuration using only one infrared light bulb 10-2 is also possible. In that case, for example, the infrared light bulb 10-1 is connected to a metal wire, for example,
Replace with stainless wire. Thus, a double-tube infrared light bulb having the same base structure as described above can be realized. Further, a device using three or more infrared light bulbs is also possible. In this case, if three wires are respectively connected to the external lead wires 18-1 and 18-2, a double-tube infrared light bulb can be realized without any problem. The bent portions 33 and 34 at both ends of the metal plate 30 can be more securely fixed if they are bent to both sides in addition to the structure bent in one direction as shown in FIG. Infrared light bulb 10-1, 1 of metal plate 30
The mounting position at 0-2 is not limited to that of the present embodiment.

The infrared light bulb having a double tube structure according to the present embodiment has a structure in which the lead wires 18-1 and 18-2 for external lead-out are led out to one end of the transparent heat-resistant glass tube 11. Accordingly, a double-tube infrared lamp having a structure in which the base 21 having the screw portion is provided can be configured. The provision of the base 21 allows easy attachment and detachment. Since the lead wire comes out only at one end,
It can be used by immersing it in a solution as it is. If a glass material other than quartz glass is used for the transparent heat-resistant glass tube 11, a double-tube infrared light bulb with less devitrification caused by an alkali component can be realized. In particular, in the case of using in a cooking device for cooking a material in which salt is scattered, such as food processing, since the salt does not directly adhere to the infrared light bulbs 10-1 and 10-2, a double-tube infrared ray having a long life and little deterioration in performance is used. A light bulb can be realized. If the infrared lamps 10-1 and 10-2 are arranged with the planar portions of the plate-shaped heating element facing in the same direction, a double-tube infrared lamp in which radiated light is concentrated and emitted in a direction perpendicular to the surface is obtained. Can be formed. As a result, a double-tube infrared light bulb having high energy efficiency can be manufactured. According to the experimental results, the radiation intensity of far infrared rays of 1 to 14 μm was able to be improved by about 30% as compared with the infrared ray bulb having a double tube structure having two rod-shaped heating elements. Since the metal plate 15-2 is joined to the external lead wire 18-2 by welding with the metal bar 19, the infrared light bulbs 10-1 and 10-2 can be more securely fixed, and a double layer resistant to vibration and impact is provided. A tube-structured infrared light bulb was realized. Metal plates 15-1 and 15-2 having bent portions 33 and 34 for fixing infrared light bulbs 10-1 and 10-2.
By providing a spring property, a double-tube infrared light bulb that is more resistant to vibration and impact can be realized. The metal plate 15
Since the bent portions 33 and 34 at both end portions of -1 and 15-2 are in contact with the inner wall of the glass tube 11, the infrared light bulb 10-
1, 10-2 can always be held at a predetermined position.

<< Second Embodiment >> FIG. 3A is a sectional view of a double-tube infrared light bulb according to a second embodiment of the present invention. FIG.
1A shows a cross section at substantially the same place as the II-II cross section in FIG. 1 and shows the configuration of the holding portion of the infrared light bulb. An opening 41, which is slightly larger than the size of the end portion 9-1 of the infrared light bulbs 10-1 and 10-2 shown in FIG.
Metal or ceramic holding plate 40 having 42
(Indicated by diagonal lines for clarity) are provided in the transparent heat-resistant glass tube 11 instead of the metal plates 15-1 and 15-2 in the first embodiment, whereby the infrared light bulbs 10-1 and 10- are provided. 2 are held. The openings 41 and 42 of the holding plate 40 are filled with inorganic cement or the like, and the ends 9-1 of the infrared light bulbs 10-1 and 10-2 are fixed by solidifying the inorganic cement. The outer diameter of the holding plate 40 is slightly smaller than the inner diameter of the transparent heat-resistant glass tube 11.

The holding plate 40 allows the infrared light bulbs 10-1 and 10-1, 1
0-2 can be more reliably fixed inside the transparent heat-resistant glass tube 11. Since the holding plate 40 is arranged outside the heat-generating portions of the infrared light bulbs 10-1 and 10-2, the radiated light from the heat-generating portions is shielded by both the holding plates 40 and the infrared light bulbs 10-1 and 10-2 are Does not reach both ends. As a result, it is possible to suppress an increase in the temperature of portions that are vulnerable to high temperatures, such as the external lead wires 18-1 and 18-2 and the base 21. As a result, a double-tube infrared light bulb having a highly reliable base can be realized. In addition, if the metal holding plate 40 is used, an effect of shielding jamming radio waves can be expected. For example, as shown in FIG.
When used in the oven heater for
A metal case 49 in which a metal holding plate 40 shields the inside and outside of a heating chamber 48 of a microwave oven 47
The infrared light bulb having the double-tube structure is arranged so as to be substantially flush with the plate. With this arrangement, radio waves in the heating chamber 48 of the microwave oven 47 are blocked by the holding plate 40,
No leakage to the outside. This realizes a microwave oven that does not emit noise to the external environment.

<< Third Embodiment >> A dual tube infrared light bulb according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 shows an infrared light bulb 10-1 of the double-tube infrared light bulb of the present embodiment,
It is a cross-sectional view which shows the structure of 10-2 holding parts. The cross-sectional view of FIG. 4 shows a cross section at substantially the same location as the cross section taken along line II-II of FIG. The cross section of the outer transparent heat-resistant glass tube 45 in this embodiment is not circular but oval, and two infrared light bulbs 10-1 and 10-2 are placed on the metal plate 15 on the long diameter line.
It is fixed at -1. The infrared light bulb 10- shown in FIG.
When the heating elements 1 and 10-2 are plate-shaped, they are arranged so that the plate surface is parallel to the major axis. Since the transparent heat-resistant glass tube 45 is elliptical, a double-tube infrared lamp with a small volume can be realized. By arranging the plate-shaped heating element 1 so that the plate surface is parallel to the major axis, it is possible to provide a double-tube infrared lamp in which radiated light in the direction perpendicular to the major axis direction is enhanced. The metal plate 15-1 is mounted in a direction parallel to the major axis of the elliptical shape in the cross sectional view of FIG. Therefore, without turning inside the transparent heat-resistant glass tube 45, the infrared light bulb 10-
It is possible to provide a double-tube infrared lamp in which 1, 10-2 are not displaced.

<< Fourth Embodiment >> A dual-tube infrared light bulb according to a fourth embodiment of the present invention will be described with reference to the side view of FIG.
FIG. 5 is a view of the double-tube infrared light bulb viewed from the short side of the plate-shaped heating element 1. In this embodiment, a reflection film 50 indicated by oblique lines is formed on the double-tube infrared light bulb of FIG. 1 for convenience. The reflection film 50 is formed on the inner surface or outer surface of the right half of the circumference of the cross section of the transparent heat resistant glass tube 11. As the reflection film 50, a film having high infrared reflection efficiency such as an aluminum film, a silver film, or a titanium nitride film is desirable.
In the double-tube infrared light bulb of this embodiment, most of the radiated light is emitted to the left in FIG. 5, and a double-tube infrared light bulb with high luminous efficiency can be realized. Since the energy use efficiency is greatly improved, significant energy savings can be achieved. Since most of the light emitted from the infrared light bulbs 10-1 and 10-2 in the direction of the reflection film 50 is reflected by the reflection film 50, there is almost no light behind the reflection film 50. Therefore, when a double-tube infrared light bulb is mounted on various devices, the reflection film 50
Nothing behind is heated. For example, when a reflective film 50 similar to that of FIG. 5 is provided in a double-tube infrared light bulb using a non-circular transparent heat-resistant glass tube 45 shown in FIG.
It is possible to realize a double-tube infrared light bulb having various characteristics, such as condensing radiated light, turning it into parallel rays, and making it divergent.

<< Fifth Embodiment >> A double-tube infrared lamp according to a fifth embodiment of the present invention will be described with reference to FIGS. 6 (side view) and FIG. The basic structure of the double-tube infrared light bulb of the fifth embodiment is the same as that of the first embodiment, as shown in FIG. The base 55 of the present embodiment does not have a threaded portion as shown in FIG. 1, but has an engagement protrusion 56 on the side surface instead. External lead wire 18
-1 is the base 55, and the lead wire 18-2 is the insulating material 5
Each is connected to a metal plate 57 fixed to the base 55 through 5-1. FIG. 7 is a cross-sectional view of the socket 60 for mounting the base 55. When the base 55 is attached to the socket 60 and the projection 56 is inserted into the cutout 62 of the socket 60, the metal plate 57 of the base 55 contacts the contact 63 of the socket 60. The contact 63 is insulated from the outer peripheral portion 61 of the socket by an insulating material 64,
The spring 65 is configured to be pressed against the metal plate 57 of the base 55. In the connection method of the present embodiment, the orientation at the time of mounting the double-tube infrared light bulb 11 is regulated to a desired direction by the projection 56 of FIG. 6, and the direction of the heating element is always constant in relation to the socket. Therefore, even when the double-tube infrared light bulb is replaced, the heating element always faces in a desired direction, thereby facilitating maintenance work.

<< Sixth Embodiment >> A dual tube infrared light bulb according to a sixth embodiment of the present invention will be described with reference to the side view of FIG. 8, the configuration of the double-tube infrared light bulb of this embodiment is substantially the same as that of FIG. The infrared light bulb 71 is the infrared light bulb 10-2 of FIG.
Is the same as The infrared light bulbs 70 are arranged in parallel.
There are two linear heating elements 73 and 74. Heating element 7
Both ends of 3 and 74 are attached to terminals 75-1 and 75-2, and are electrically connected in parallel. Other configurations are the same as those of the infrared light bulb 71. Linear heating element 73,
74 has a desired resistance value more easily than the plate-shaped heating element 1 of the infrared light bulb 71. By changing the resistance values of the linear heating elements 73 and 74 and setting the combined resistance value of the heating element 1 and the heating elements 73 and 74 connected in series to a desired value, a desired power consumption of 2 A double-tube infrared light bulb can be obtained. As a result of combining the heating element 1 and the heating elements 73 and 74 having different shapes, various infrared light bulbs having a double-tube structure having different radiation characteristics can be obtained. Further, if the lengths of the heat generating portions of the infrared light bulbs 70 and 71 are made different from each other, the intensity distribution of the emitted light in the longitudinal direction of the double-tube infrared light bulb can be changed. Thus, one double-tube infrared light bulb can cope with an object to be heated including a part to be strongly heated and a part to be hardly heated.

<< Seventh Embodiment >> A double-tube infrared lamp according to a seventh embodiment of the present invention will be described with reference to the side view of FIG. In FIG. 9, the upper ends of infrared light bulbs 80 and 81 in which a heating element made of a carbon-based material is sealed in a transparent quartz glass tube are connected to a metal plate 15.
It is fixed at -1. The molybdenum wires 12-1 and 12-2 derived from the infrared light bulbs 80 and 81 are connected by a metal wire 13, and another metal wire 8 is connected to the metal wire 13.
2 are connected at one end. Metal wire 82 is infrared light bulb 8
The ends are connected to pins 86 of a cap (base) 89 via an external lead wire 83. The lower ends of the infrared light bulbs 80 and 81 are fixed by a metal plate 15-2, and the molybdenum wires 12-3 and 1
2-4 are connected to the respective external lead wires 84 and 85. The external lead wires 84 and 85 are connected to the pins 87 and 88 via the foot tube 17, respectively. Pin 8
6, 87 and 88 are fixed to a ceramic cap 89. The cap 89 is made of inorganic cement or the like.
The lower end of the transparent heat-resistant glass tube 11 is joined to a portion sealed with a foot tube 17.

The dual-tube infrared light bulb of this embodiment has a molybdenum wire 12- at the terminals of two infrared light bulbs 80 and 81.
3, 12-4 are connected to external lead wires 87, 88, and the connection points of the infrared light bulbs 80, 81 are connected to pins 86 via external lead wires 83. Therefore, the two infrared light bulbs 80 and 81 can be turned on independently. That is, it is possible to realize a double-tube infrared lamp in which power consumption can be changed in two stages. Two infrared light bulbs 80, 81
May have the same or different power consumption. Pin 8
Since 6, 87 and 88 are held by the ceramic cap 89, there is a great feature that the cap 89 can be used even in a special environment where the cap 89 is at a high temperature.

<< Eighth Embodiment >> An infrared lamp with a double tube structure according to an eighth embodiment of the present invention will be described with reference to FIG. In the double-tube infrared light bulb of each of the above embodiments, the external lead wires 18-1 and 18-2 were led out from one end of the transparent heat-resistant glass tube 11. In the present embodiment, as shown in FIG. 10, external lead wires 107-1 and 107-2 are led out in both directions of the transparent quartz glass tube 103. Both ends of infrared light bulbs 101 and 102 in which a heating element 1 made of a carbon-based material is sealed in a transparent quartz glass tube 2 are fixed by metal plates 15-1 and 15-2, respectively. Lead wires 12-1 and 12- of infrared light bulbs 101 and 102, respectively;
2 are connected by a metal wire 104-1 such as stainless steel. The lead wires 12-3 and 12-4 are connected by a metal wire 104-2 such as stainless steel. Metal wire 104-
1 and 104-2 each have a metal wire 10 such as molybdenum.
One ends of 5-1 and 105-2 are connected. Metal wire 1
05-1, 105-2, the molybdenum foil 106
-1 and 106-2 are welded at one end, respectively, and the other ends of the molybdenum foils 106-1 and 106-2 are connected to molybdenum external lead wires 107-1 and 107-2, respectively. Each of the above elements is inserted into the transparent quartz glass tube 103. Both ends of the transparent quartz glass tube 103 are melted and sealed at the molybdenum foils 106-1 and 106-2. Inside the transparent quartz glass tube 103, air,
Argon, nitrogen, or a mixed gas thereof is sealed. According to the structure of the present embodiment, a conventional infrared bulb manufacturing method using quartz glass can be used as it is, so that an inexpensive double-tube infrared bulb can be provided. In the case where transparent quartz glass is used for the outer tube, far infrared rays having a wavelength of about 5 μm are emitted without being absorbed by the glass tube.

Although two infrared lamps are used in the double tube infrared lamp of FIG. 10, one or three or more infrared lamps may be used. The gas sealed in the transparent quartz glass tube 103 of the double tube infrared lamp is preferably argon, but air, argon, nitrogen, krypton, xenon, or a mixed gas thereof is also used. The necessary gas may be selected in consideration of the properties such as the thermal conductivity of the gas. Although the transparent quartz glass tube 103 has been described as being transparent, translucent or opaque glass can be used without any problem. This embodiment is not limited to the configuration of the embodiment shown in FIG. 10, and it goes without saying that the configurations of the above embodiments can be combined.

The infrared light bulb of the double tube structure of each of the above embodiments is
The features can be utilized if applied to the following various devices. (1) Heating device: For example, stove, sauna, kotatsu, foot warmer, bathroom drying / heating machine, stove for dressing room, etc .; (2) Drying device: For example, clothes dryer, tableware dryer, futon dryer, various paints Drying and baking device for coating, drying device for printed matter, drying device for printed circuit board after washing, drying device for photographic printing paper after washing, etc .; (3) heating device: for example, heating of drinking water, heating of ornamental water tank Vessels, refrigerator defrosters, water heaters, garbage disposal machines, heating devices for various foods, heating devices for fixing toner in electrophotography, etc .; (4) Heating devices: for example, deli carts, meat buns, sausages, yakitori, takoyaki, etc. (5) Cooking device: for example, microwave oven, roaster, toaster, microwave oven, yakitori device, hamburger cooker, various home-use cooking devices, etc .; (6) Medical device: (7) Roasting device: for example, roasting device for sesame, iriko, coffee, barley tea, peanut, bean confectionery, almond, etc .; (8) Ripening device: for example, fruit wine, pickles, ham, smoked ,
(9) Fermentation device: for example, fermentation device for yogurt, vinegar, soy sauce, lactic acid drink, oolong tea, fermented liquor, etc .; (10) Defrosting device: for example, for defrosting frozen food; (11) Baking Equipment: For example, kamaboko, bamboo wheel, bread, cake,
(12) Sterilizer: Sterilizer for, for example, buckwheat, bonito, fruit, and vacuum-packed food.

[0030]

As described in detail in each of the above embodiments, the double-tube infrared lamp of the present invention in which the infrared lamp is sealed in a transparent heat-resistant glass tube uses various glass materials for the outer glass. Therefore, for example, it is possible to provide an infrared light bulb that does not cause a devitrification phenomenon due to adhesion of an alkali component. A double-tube infrared lamp in which one or a plurality of infrared lamps are inserted into a transparent heat-resistant glass tube can easily be manufactured with various power consumptions. Since it has a structure in which the external lead wire is collected at one end of the outer transparent heat resistant glass tube,
It has a great feature that a double-tube infrared lamp can be used by directly immersing it in various solutions. In addition, since there is a connection portion having a base structure, an infrared light bulb that can be easily attached and detached and that can be easily handled can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a double-tube infrared light bulb according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3A is a cross-sectional view of a double-tube infrared light bulb having a holding plate according to a second embodiment of the present invention. (B) is a cross-sectional view of a microwave oven incorporating the double-tube infrared light bulb of the second embodiment.

FIG. 4 is a sectional view of a double-tube infrared light bulb according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a double-tube infrared light bulb according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a double-tube infrared light bulb according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view of a socket of a double tube infrared light bulb according to a fifth embodiment of the present invention.

FIG. 8 is a sectional view of a double-tube infrared light bulb according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view of a double-tube infrared light bulb according to a seventh embodiment of the present invention.

FIG. 10 is a sectional view of a double-tube infrared light bulb according to an eighth embodiment of the present invention.

FIG. 11A is a cross-sectional view of a conventional infrared light bulb. (B)
Is a side sectional view of a conventional infrared light bulb.

[Explanation of symbols]

Reference Signs List 1 heating element 2 quartz glass tube 3 terminal 4, 5, 6, 8, 12 lead wire 7, 106 molybdenum foil 10, 70, 71, 80, 81, 101, 102 infrared light bulb 11 transparent heat-resistant glass tube 15 metal plate 17 Foot pipe 18 External lead wire 21, 55 Base 40 Ceramic plate 50 Reflective film 60 Socket 86, 87, 88 Pin 89 Cap

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hirofumi Tange 22nd Oyama Motoyama Ko, Toyonaka-cho, Mitoyo-gun, Kagawa Prefecture Inside Kagawa Kawashita Kotobuki Electronic Industry Co., Ltd. 22 Kaori Kawamatsu Matsushita Electronics Corporation

Claims (16)

[Claims] 1. A round bar or a flat heating element made of a sintered body of a carbon-based material, a heat-resistant and electrically conductive terminal joined to both ends of the heating element, and one end part close to the terminal. An internal lead wire of an elastic metal attached by fitting; a molybdenum foil having one end joined to the other end of the internal lead wire; an external lead wire joined to the other end of the molybdenum foil; An infrared light bulb having a transparent quartz glass tube with a body, terminals, internal leads and molybdenum foil inserted therein, filled with an inert gas and melt sealed at the molybdenum foil portion; and at least one infrared light bulb A lead wire having a bulb inside and connecting to a terminal of the infrared bulb,
A double-tube infrared light bulb having a transparent heat-resistant glass tube which is led out from one end and is sealed. 2. A double-tube infrared light bulb in which at least one infrared light bulb is sealed in a transparent heat-resistant glass tube, wherein both ends of the infrared light bulb are located substantially at the center of the transparent heat-resistant glass tube. The double-tube infrared lamp according to claim 1, further comprising a metal plate that is held so as to be positioned at the portion. 3. The metal plate has a bent portion at both ends, and the bent portion contacts the inner wall of the transparent heat-resistant glass tube and holds the infrared light bulb at a substantially central portion. The infrared light bulb having a double tube structure according to claim 1. 4. The double-tube infrared light bulb according to claim 2, wherein the metal plate is connected to and fixed to an electric wire introduced from the outside into the transparent heat-resistant glass tube. 5. A metal plate or a metal plate having a diameter slightly smaller than the inner diameter of the transparent heat-resistant glass tube, so that both ends of the infrared light bulb are positioned so that the infrared light bulb is located substantially at the center of the transparent heat-resistant glass tube. 2. The infrared light bulb according to claim 1, wherein the infrared light bulb is fixed by a ceramic plate. 6. A central portion of the base, wherein one of the external lead wires led from one end of the transparent heat-resistant glass tube is connected to a side surface of a base having a screw, and the other is insulated from the side surface. 2. The metal plate of claim 1, wherein the base is joined to the transparent heat-resistant glass tube.
A dual-tube infrared light bulb as described in the above. 7. The base, wherein one of external lead wires led out from one end of the transparent heat-resistant glass tube is connected to a side surface of a base having a protrusion on an outer peripheral portion, and the other is insulated from the side surface. 2. The double-tube infrared light bulb according to claim 1, wherein the base is joined to a metal plate at a central portion, and the base is joined to the transparent heat-resistant glass tube. 8. An external lead wire led out from one end of the transparent heat-resistant glass tube is connected to an insertion pin provided on a ceramic base, and the ceramic base is joined to the transparent heat-resistant glass tube. The infrared light bulb according to claim 1, characterized in that: 9. At least one infrared light bulb is inserted into a transparent heat-resistant glass tube sealed at one end, and an external lead-out lead wire is led out to the other end of the transparent heat-resistant glass tube and sealed. 2. The double-bulb infrared light bulb according to claim 1, wherein one lead wire of the infrared light bulb enclosed in the transparent quartz glass tube is joined to the external lead-out wire by a metal wire. 3. Tube structure infrared bulb. 10. A double infrared light bulb in which a plurality of infrared light bulbs are inserted into a transparent heat-resistant glass tube having one end sealed, and an external lead-out wire is led out to the other end of the transparent heat-resistant glass tube and sealed. 2. The infrared light bulb having a tube structure, wherein the plurality of infrared light bulbs have different power consumptions and different lengths.
A dual-tube infrared light bulb as described in the above. 11. A plurality of infrared light bulbs are inserted into a transparent heat-resistant glass tube having one end sealed, and a lead wire for external lead-out is drawn out and sealed at the other end of the transparent heat-resistant glass tube. 2. The infrared light bulb according to claim 1, wherein the terminals of the plurality of infrared light bulbs are led out to the outside so that each infrared light bulb can be turned on independently.
Double tube infrared light bulb. 12. A plurality of infrared lamps having a plate-like heating element made of a carbon-based substance, which are mounted in the double-tube infrared lamp, are arranged such that a wide surface faces in the same direction. The infrared light bulb according to claim 1, characterized in that: 13. The infrared lamp according to claim 1, wherein the glass tube has a non-circular cross section. 14. At least one infrared light bulb is inserted into a transparent heat-resistant glass tube sealed at one end, and an external lead wire is led out to the other end of the transparent heat-resistant glass tube.
The infrared light bulb having a double tube structure according to claim 1, wherein a reflection film is provided on a substantially half-circumferential portion inside or outside the transparent heat-resistant glass tube. 15. A double-tube infrared lamp in which at least one infrared light bulb is inserted into a transparent heat-resistant glass tube having one end sealed and a lead-out wire for external drawing is collected at the other end. 2. The double-tube infrared lamp according to claim 1, wherein air, nitrogen, argon, krypton, or a mixture of one or more of these gases is sealed in the transparent heat-resistant glass tube. 16. A round bar or flat heating element made of a carbon-based material, a terminal having heat resistance and electrical conductivity connected to both ends of the heating element, one end of the terminal. A metal wire, a metal plate, or a spring-like internal lead made of a stranded wire, which is attached by tight fitting; a molybdenum foil having one end joined to the other end of the internal lead; External leads joined to the other end of the foil,
The heating element, the terminal, the internal lead wire and the molybdenum foil are inserted therein, and a transparent quartz glass tube which is filled with air, argon gas, nitrogen or a mixed gas thereof and is melt-sealed at the molybdenum foil portion is provided. An infrared light bulb, and a double-tube infrared light bulb having at least one infrared light bulb therein, wherein two terminals of the infrared light bulb are each provided with a transparent heat-resistant glass tube which is led out from both ends and sealed.