JP2004259701A - Infrared lamp, heating and space heating device, and method of manufacturing infrared lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared lamp which will not increase its power consumption, even if it is used for a long time and has superior directivity and reliability by preventing the blowing of a heating part due to a long use, and to provide a heating and space heating device and a method of manufacturing the infrared lamp. <P>SOLUTION: A heating element in the infrared lamp substantially has a plate-like shape with the width of not less than 5 times the thickness, and is formed of a carbon material containing a resistance-adjusting material. At both ends of a glass tube in which the heating element 2 is sealed in airtight, electrodes are embedded and they are electrically connected with both ends of the heating element separately, and with external electric circuits. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to an infrared light bulb used for a heating device for heating an object and a heating device for heating a room or the like (hereinafter, referred to as a heating / heating device), and more particularly, to a heat source using a carbon-based material as a heating element. The present invention relates to an infrared light bulb having excellent functions, a heating / heating device using the infrared light bulb, and a method for manufacturing an infrared light bulb.

The conventional infrared light bulb has a problem that when used for a long time, the power consumption becomes abnormally high, and in some cases, the heat-generating portion is blown. Hereinafter, this problem will be described.
Conventionally, as an infrared light bulb used as a heat source, an infrared light bulb having a tungsten spiral filament held at the center of a glass tube by a large number of tungsten supports is used. However, the infrared emissivity of tungsten is as low as 30 to 39%, and the rush current during lighting is high. Furthermore, to hold the tungsten spiral filament in the center of the glass tube, it was necessary to use a large number of tungsten supports, and the assembly was not easy. In particular, it has been very difficult to enclose a plurality of tungsten spiral filaments in a glass tube in order to obtain a high output.

  In order to solve these problems, an infrared lamp using a rod-shaped carbon-based material as a heating element instead of a tungsten spiral filament has been conventionally proposed. As such a conventional infrared light bulb, for example, there is an infrared light bulb disclosed in Japanese Patent Application Laid-Open No. H11-54092 (Patent Document 1) by the same applicant as the present invention. Since the carbon-based material has a high infrared emissivity of 78 to 84%, the use of the carbon-based material as the heating element also increases the infrared emissivity of the infrared light bulb. In addition, since the carbon-based material has a negative resistance-temperature characteristic in which the resistance value decreases as the temperature rises, it also has a great feature that an inrush current during lighting can be reduced.

  20 and 21 are front views showing a conventional infrared light bulb described in Patent Document 1 using a carbon-based material as a heating element. FIG. 20A is a diagram showing a structure of a lead wire lead-out part of a conventional infrared light bulb in which one heating element 200 is sealed in a glass tube 100. FIG. 20B is a partially enlarged view of a connection portion between the heating element 200 and the lead wire 104 of the infrared light bulb of FIG. FIG. 21 is a partially enlarged view showing a connection portion between the heating elements 200a and 200b and the lead wire 104 of a conventional infrared bulb in which two heating elements 200a and 200b are sealed in a glass tube. FIG. 20A shows the structure of one end of the infrared light bulb, and the other end of the infrared light bulb has the same structure. The infrared light bulb shown in FIG. 21 has the same structure as that of FIG. 20A except for the connection between the two heating elements 200a and 200b and the lead wire 104 shown in the figure.

  In FIG. 20A, in a conventional infrared light bulb, a metal wire 102 wound in a coil shape is wound around an end of a heating element 200 formed in a rod shape made of a carbon-based material. The end of the coil-shaped metal wire 102 is covered with a metal foil sleeve 103, and the metal foil sleeve 103 is fixed to an end of the heating element 200 by caulking. At one end of the metal foil sleeve 103, an internal lead wire 104 made of a metal wire having a coil portion 105 wound like a spring in the middle is electrically connected. One end of a molybdenum foil 107 is spot-welded to the other end of the internal lead wire 104. Further, an external lead wire 108 made of a molybdenum wire is welded to the other end of the molybdenum foil 107. The heating element 200, the metal foil sleeve 103, the internal lead wire 104, the molybdenum foil 107, and the external lead wire 108, which are thus connected in series, are inserted and arranged in the glass tube 100. An inert gas such as argon or nitrogen is sealed inside the glass tube 100, and the glass tube 100 is melt-bonded at the molybdenum foil 107 to complete the infrared light bulb.

  FIG. 21 is a perspective view showing the inside of another conventional infrared light bulb, and shows the structure of a connection portion between two heating elements 200a and 200b and a metal lead wire 104 in a conventional infrared light bulb. As shown in FIG. 21, this conventional infrared light bulb has a structure in which two heating elements 200a and 200b are sealed in one glass tube (not shown). In the infrared light bulb of FIG. 21, the coiled metal wires 102a and 102b are wound around each end of the heating elements 200a and 200b, and then the metal foil sleeve 106 is inserted. The inserted metal foil sleeve 106 is fixed to the ends of the heating elements 200a and 200b by caulking. A metal lead wire 104 having a coil portion 105 wound in a spring shape on the way is electrically connected to the metal foil sleeve 106.

The infrared light bulb having the above-described structure has excellent infrared emissivity because a carbon-based material is used for the heating element, but has the following problem.
That is, in the conventional infrared light bulb having the structure shown in FIG. 20, when the wattage of the infrared light bulb increases, that is, when the power consumption increases, the temperature of the coil-shaped metal wire 102 increases. As a result, when the infrared light bulb having this structure is used for a long time, the contact resistance of the connection between the heating element 200, the coil-shaped metal wire 102, and the metal foil sleeve 103 increases due to a rise in temperature. As a result, the conventional infrared light bulb has a problem that the connection portion generates abnormal heat. Also, if the temperature of the connection between the coil-shaped metal wire 102 and the metal sleeve 103 continues to rise for a long period of time, in the worst case, the temperature of the connection may be increased and the fuse may be melted. Further, a stress due to a difference in the coefficient of thermal expansion between the heating element 200 and the coil-shaped metal wire 102 is applied by the heat cycle, and the contact resistance increases from the beginning of use, thereby accelerating the rise in the temperature of the connection portion.

The structure of the infrared light bulb having the two heating elements 200a and 200b shown in FIG. 21 has the following problem.
That is, in the step of caulking both ends of the two heating elements 200a and 200b with the metal foil sleeve 106, there is no problem if the two heating elements 200a and 200b are caulked with uniform tension or compression force. It is also possible that caulking occurs when the balance of power is lost. In the conventional infrared light bulb thus caulked, when the heat generating elements 200a and 200b generate heat, the two heat generating elements 200a and 200b thermally expand in different states. For this reason, the balance of the tension or the compressive force applied to the heating elements 200a and 200b becomes more unbalanced. Particularly, when the crimping state is not well-balanced, the carbon-based heating element subjected to a large tension or compression force sometimes breaks.

Next, a problem of directivity in a conventional infrared light bulb will be described.
Infrared light bulbs are used in heating devices for heating objects by radiating infrared rays or in heating devices for heating rooms or the like. As such a conventional infrared light bulb, an infrared light bulb having a configuration as shown in FIG. 22 is known. FIG. 22 is a plan view showing an example of a conventional infrared light bulb. FIG. 23 is a perspective view of the conventional infrared light bulb shown in FIG. In FIGS. 22 and 23, the central portion of the infrared light bulb is easily understood from the description of the illustrated two side portions, and therefore, the illustration of the central portion of the infrared light bulb is omitted in both figures.

  The conventional infrared light bulb shown in FIGS. 22 and 23 has a substantially cylindrical glass tube 201, a metal foil 205 embedded at both ends of the glass tube 201, and is hermetically sealed inside the glass tube 201. It comprises a heating element 240 and an internal lead wire 204. The heating element 240 is formed by winding a resistance wire made of nichrome or tungsten in a coil shape. The internal lead wires 204 connect both ends of the heating element 240 and the metal foil 205, respectively. As a result, the heating element 240 is electrically connected to the metal foil 205, is appropriately pulled by the internal lead wires 204 on both sides, and is fixed stably. At this time, the central axis of the coil-shaped heating element 240 is arranged so as to be substantially coaxial with the central axis of the cylindrical glass tube 201.

  As shown in FIGS. 22 and 23, external lead wires 206 are connected to the metal foils 205 on both sides, respectively. When a voltage is applied to the external lead wires 206 derived from both sides, a current flows in the heating element 240, and heat is generated from the heating element 240 due to the resistance of the heating element 240 to the current. At this time, infrared rays are radiated from the heating element 240.

  FIG. 24A is a graph of an intensity distribution curve 270 of infrared rays emitted by the heating element 240 of the infrared light bulb shown in FIG. FIG. 24B is a cross-sectional view of a portion of the infrared light bulb shown in FIG. 23 having the heating element 240. The x-axis and y-axis shown in FIGS. 24A and 24B are orthogonal coordinate axes in a plane perpendicular to the axial direction of the heating element 240 shown in FIG. 24A and 24B, the origin 0 corresponds to the central axis of the heating element 240. In the graph of FIG. 24A, the radial direction indicates the radiation intensity of infrared rays, and the circumferential direction indicates the angle with respect to the center axis on a plane perpendicular to the axial direction of the heating element 240. This angle is indicated by the angle from the positive direction of the x-axis.

The intensity distribution curve 270 indicates the amount of infrared rays that reach a minute constant area at a point at a certain distance from the central axis of the heating element 240 (origin 0 in FIG. 24) when a certain voltage is applied to the heating element 240. Obtained by measurement.
As shown by the intensity distribution curve 270 in FIG. 24A, the heating element 240 radiates infrared rays in all directions with substantially the same intensity. This is because the cross section of the heating element 240 is substantially axially symmetric and has a circular shape, as shown in FIG.
As described above, heat is transmitted from the heating element 240 to the outside by isotropic infrared rays radiated at substantially the same intensity in all directions, and is used for external heating and surrounding heating.
In the conventional infrared light bulb configured as described above, when it is desired to have directivity in the radiation intensity of infrared rays, for example, a configuration is known in which an infrared reflector is installed outside the infrared bulb.

  FIG. 25 is a perspective view showing an example in which an infrared reflecting plate 280 is provided in a conventional infrared light bulb, and shows a positional relationship between the infrared light bulb and the infrared reflecting plate 280. The infrared reflecting plate 280 has a semi-cylindrical shape, and is arranged coaxially with the heating element 240 so as to surround half of the heating element 240.

FIG. 26A is a graph of an intensity distribution curve 271 showing infrared rays radiated from an infrared light bulb provided with an infrared reflector 280. FIG. 26B is a cross-sectional view of a portion including the heating element 240 of the infrared light bulb having the infrared reflecting plate 280 shown in FIG. The x-axis and y-axis shown in FIGS. 26A and 26B are orthogonal coordinate axes in a plane perpendicular to the axial direction of the heating element 240 shown in FIG. The direction facing the reflecting surface of the infrared reflecting plate 280 is defined as the negative direction of the x-axis. 26A and 26B, the origin 0 corresponds to the central axis of the heating element 240. In the graph of FIG. 26A, the radial direction indicates the radiation intensity of infrared rays, and the circumferential direction indicates the angle with respect to the center axis in a plane perpendicular to the axial direction of the heating element 240. This angle is indicated by the angle from the positive direction of the x-axis. In (a) of FIG. 26, the concentric scale indicating the radiation intensity has the same value as the scale of (a) in FIG. 24 described above. The method of measuring the radiation intensity is the same as in the case of FIG.
As shown in FIG. 26A, by providing the infrared reflecting plate 280, infrared rays are strongly radiated only to one side of the infrared light bulb around the positive direction of the x-axis.
JP-A-11-54092 JP-A-11-214215 JP-A-11-214216

As described above, the conventional infrared light bulb has an isotropic intensity distribution of infrared radiation. Therefore, in order to provide directivity to infrared radiation, it is necessary to provide an infrared reflector outside the infrared bulb.
However, the infrared reflectance of the infrared reflector tends to deteriorate due to aging and adhesion of dirt. Therefore, the intensity distribution of the infrared radiation differs depending on the direction of the radiation. Further, the amount of infrared light absorbed by the reflector itself increases with a decrease in the infrared reflectance. If such a heating / heating device is used for a long period of time, the radiation efficiency becomes poor, and unexpected portions may be overheated.

  Further, the radiation intensity distribution obtained by providing the semi-cylindrical infrared reflecting plate for the infrared light bulb having the isotropic radiation intensity distribution as described above is as shown in FIG. And generally have substantially the same strength over a wide area on one side. Therefore, in the conventional infrared light bulb, it has been difficult to increase the directivity of increasing the radiation intensity only in a more limited range and suppressing the radiation intensity in other ranges. As a result, when the conventional heating / heating device is used for local heating, there is a problem that the heating efficiency is deteriorated.

  The present invention has been made in order to solve the above-described problems, and does not increase power consumption even when used for a long period of time. It is an object of the present invention to provide a highly reliable infrared light bulb having reliability. In addition, the present invention suppresses the influence of a decrease in the reflectance of the infrared reflector on the directional distribution of the radiation intensity of the infrared rays, and makes the directivity of the radiation intensity of the infrared rays stronger than the conventional one. With the goal. An object of the present invention is to provide an infrared light bulb, a heating / heating device, and a method of manufacturing the same, which have directivity of infrared radiation intensity without using a special reflector.

The infrared light bulb according to the present invention has a substantially plate shape, the width is 5 times or more the thickness, the heating element formed of a carbon-based material including a resistance value adjusting substance,
A glass tube that hermetically encloses the heating element, and
An electrode embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit;
Thus, the radiation intensity of the infrared light bulb is maximum in the thickness direction of the heating element, and is negligibly small in the width direction as compared with the maximum value.

In the heating / heating device according to the present invention, the infrared light bulb has a substantially plate-like shape, has a width of at least 5 times the thickness, and is formed of a carbon-based material including a resistance adjusting substance. Heating element,
A glass tube for hermetically sealing the heating element inside,
An electrode is embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit.
As a result, the radiation intensity of the infrared light bulb in the heating / heating device is maximum in the thickness direction of the heating element, is negligibly smaller than the maximum value in the width direction, and has directivity.

The method for manufacturing an infrared light bulb according to the present invention includes a step of forming glass into a substantially cylindrical shape to form a glass tube,
A substantially plate-shaped heating element whose width is at least five times as large as its thickness is placed on the glass so that its longitudinal center line is substantially coaxial with the central axis of the glass tube. A process of hermetically sealing in a pipe, and
Forming a reflecting film for reflecting infrared rays in a substantially semi-cylindrical shape on the outer surface of the cylindrical shape of the glass tube so as to substantially include a range in the axial direction in which the heating element is arranged, Having.
This makes it possible to easily form a semi-cylindrical reflective film using the cylindrical shape of the glass tube.

Further, a method for manufacturing an infrared light bulb according to the invention according to another aspect includes a step of forming a glass tube by forming glass into a substantially cylindrical shape,
Forming a reflective film for reflecting infrared rays on the cylindrical outer surface or inner surface of the glass tube into a predetermined substantially semi-cylindrical shape, and
A substantially plate-shaped heating element whose width is at least five times as large as the thickness is arranged so as to be included in an axial range where the reflection film is arranged, and the heating element is formed of the glass. Sealing hermetically in a tube.
Thus, a semi-cylindrical reflective film can be easily formed on the inner surface of the glass tube by using the cylindrical shape of the glass tube.

Further, the infrared light bulb according to the invention according to another aspect has a heating element having a substantially plate shape and a width of 5 times or more with respect to the thickness,
A heat dissipation block having good conductivity electrically connected to one end of the heating element,
A glass tube that hermetically encloses the heating element, and
Electrodes embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit may be provided.

Furthermore, a heating / heating device according to another aspect of the present invention has a heating element having a substantially plate shape and a width of at least 5 times the thickness,
A heat dissipation block having good conductivity electrically connected to one end of the heating element,
A glass tube that hermetically encloses the heating element, and
Electrodes embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit may be provided.

  While the novel features of the invention are set forth in the appended claims, the invention, both as to its structure and content, together with other objects and features, will be understood from the following detailed description, taken in conjunction with the drawings, in which: Will be better understood and appreciated.

According to the present invention, the following excellent effects can be obtained.
ADVANTAGE OF THE INVENTION In the infrared light bulb which concerns on this invention, the intensity | strength of the infrared rays radiated from a heating element is high and it has excellent directivity. That is, the radiation intensity of the infrared ray is maximum in the thickness direction of the heating element, and is substantially negligible in the width direction of the heating element as compared with the maximum value. In an application in which an infrared light bulb having directivity is suitable as described above, it is not necessary to use a reflector as in the related art, and it is possible to easily configure the reflector. In the infrared light bulb having such a configuration, the reflectance of the reflection plate does not decrease, and a decrease in efficiency is prevented.

  In the case where the reflection film is formed on the infrared light bulb according to the present invention, the intensity distribution curve of the infrared radiation radiated from the heating element can be adjusted to a predetermined shape. Thereby, the intensity of infrared rays radiated in unnecessary directions can be suppressed, so that the infrared light bulb of the present invention exhibits excellent radiation efficiency. Further, unlike the reflection plate, the reflection surface of the reflection film is not contaminated by extraneous substances or the like. In addition, the reflection film has a smaller change over time in shape and the like than the reflection plate, and the reflection film maintains a high reflectance for a long time as compared with the reflection plate. Therefore, the infrared light bulb according to the present invention can maintain excellent characteristics for a long period of time.

In the infrared light bulb of the present invention, by providing the reflection film at a desired position with respect to the heating element, the intensity of infrared light reflected and radiated by the reflection film is increased in a specific direction, and the range of the large radiation intensity is narrowed. be able to. Accordingly, the infrared light bulb of the present invention having such a reflective film is a device suitable for use in locally heating the direction facing the reflective film, for example, fixing in a copying machine.
Further, in the infrared light bulb of the present invention, by providing the reflection film at another desired position with respect to the heating element, the intensity of the infrared light reflected and radiated by the reflection film is made substantially the same, and the radiation The range of strength can be widened. Thus, the infrared light bulb of the present invention having such a reflective film is a device suitable for use in uniformly heating an entire plane placed parallel to the heating element and opposed to the reflective film, such as a toaster. It becomes.

In the method for manufacturing an infrared light bulb according to the present invention, the reflection film is formed using the shape of a glass tube. Thereby, a semi-cylindrical reflective film can be easily formed.
In the heating / heating device according to the present invention, since the infrared light bulb of the present invention has the same shape as the conventional infrared light bulb, the infrared light bulb of the conventional heating / heating device is replaced with the infrared light bulb of the present invention. Is possible. Therefore, by providing an infrared light bulb having directivity of infrared radiation intensity in a conventional heating / heating device, the heating / heating device has excellent characteristics, and can be used for heating an object or heating a room.
In the heating / heating device according to the present invention, by providing a semi-cylindrical reflector instead of the reflective film on the infrared light bulb, the intensity direction curve of the infrared radiation can be adjusted to a predetermined shape. With this configuration, the infrared light bulb in the heating / heating device according to the present invention can suppress the intensity of infrared rays radiated in unnecessary directions. Further, the directivity of the infrared light bulb is not affected as much as that of the conventional device because the infrared light bulb has directivity even if the reflectivity of the reflector decreases. For this reason, the heating / heating device according to the present invention has better heating / heating efficiency than before.

In the heating and heating device according to the present invention, by providing the reflection film at a desired position with respect to the heating element, the intensity of infrared light reflected and radiated by the reflection film is increased in a specific direction, and the range of the large radiation intensity Can be narrowed. Accordingly, the heating / heating device of the present invention having such a reflective film is a device suitable for use in locally heating a direction facing the reflective film.
Further, in the heating / heating device according to the present invention, by providing the reflection film at another desired position with respect to the heating element, the intensity of infrared rays reflected and radiated by the reflection film is made substantially the same. , The range of the radiation intensity can be widened. Accordingly, the heating / heating device of the present invention having such a reflection film is a device suitable for use in uniformly heating an entire plane placed parallel to the heating element and opposed to the reflection film.

  Hereinafter, preferred embodiments of an infrared light bulb and a heating / heating device according to the present invention will be described with reference to the accompanying drawings.

<< 1st Example >>
FIG. 1 is a front view showing a configuration of an infrared light bulb according to a first embodiment of the present invention, and shows a structure of a lead wire lead-out portion of the infrared light bulb. FIG. 1 shows both end portions of the infrared light bulb of the first embodiment, and a central portion thereof is omitted because it has a continuous structure connecting both end portions.

  As shown in FIG. 1, in the infrared light bulb of the first embodiment, a heating element 2, a heat radiation block 3, and an internal lead wire 4 are sealed in a glass tube 1. The internal lead wire 4 is connected to an external lead wire 8 via a molybdenum foil 7. The plate-like heating element 2 sealed in the glass tube 1 is formed of a carbon-based material composed of a mixture of crystallized carbon such as graphite, a resistance adjusting material, and amorphous carbon. The shape of the heating element 2 is plate-like, for example, 6 mm in width, 0.5 mm in thickness, and 300 mm in length. The heat radiation block 3 is formed of a conductive material, and is electrically connected to one end of the heating element 2 by a method described later. The internal lead wire 4 has a coil-shaped portion 5 formed at one end thereof, and a spring-shaped portion 6 having elasticity is formed following the coil-shaped portion 5.

As shown in FIG. 1, the coil-shaped portion 5 of the internal lead wire 4 is wound around and closely connected to the outer peripheral surface of the heat radiation block 3. The spring-like portion 6 of the internal lead wire 4 is arranged at a predetermined distance from the outer peripheral surface of the heat radiation block 3, and is configured so that a dimensional change due to expansion of the heating element 2 can be canceled out by expansion and contraction thereof and absorbed. .
In the sealing portion 1c of the infrared light bulb of the first embodiment, the inner lead wire 4 in the glass tube 1 is connected to one end of the molybdenum foil 7, and the other end of the molybdenum foil 7 is connected to the outer lead wire 8. .

  FIG. 2 is a partially enlarged perspective view showing a fitted state of the heating element 2 and the heat radiation block 3 in the first embodiment shown in FIG. As shown in FIG. 2, a slit 3a is formed at the center of the end of the heat radiation block 3. On the other hand, near the end of the heating element 2, a groove 2a extending in a direction orthogonal to the insertion direction of the heating element 2 (the direction indicated by the arrow in FIG. 2) is formed. An adhesive 9 is applied near the groove 2a of the heating element 2. The heating elements 2 thus formed are configured to be inserted into the slits 3a of the heat radiation block 3 and fixed to each other.

  The adhesive 9 applied to the heating element 2 is formed of a carbon-based substance that becomes a mixture of crystallized carbon such as graphite and amorphous carbon when heated to a high temperature. In the first embodiment, the heat radiation block 3 is formed of graphite having excellent conductivity. In the first embodiment, the internal lead wire 4 is formed of a tungsten wire having a coefficient of thermal expansion close to that of carbon. However, the internal lead wire 4 may be another metal wire such as a molybdenum wire or titanium as long as there is no problem in heat resistance in a use environment. Note that the external lead wires 8 are formed of molybdenum wires.

  As described above, in the infrared light bulb of the first embodiment, the heat radiation block 3 is closely fitted with the adhesive 9 near the end of the plate-shaped heating element 2. Further, the coil-shaped portion 5 of the internal lead wire 4 is tightly wound and fixed to the heat radiation block 3. Thus, the heating element 2 and the internal lead wire 4 are electrically connected via the adhesive 9 and the heat radiation block 3. The inner lead wire 4 is electrically connected to a molybdenum foil 7 buried in a sealing portion 1c of the glass tube 1 at an end of a spring-like portion 6 having a larger winding diameter than the coil-like portion 5. The other end of the molybdenum foil 7 is also connected to an external lead wire 8 in the sealing portion 1c.

  In the infrared light bulb of the first embodiment, a heating element 2, a heat radiation block 3, and an internal lead wire 4 connected in series are inserted into a space inside the heat-resistant glass tube 1, and are inserted into the space inside the glass tube 1. An end gas (sealing portion) of the glass tube 1 is melt-fused and sealed with an inert gas such as argon or nitrogen. Note that a part of the inner lead wire 4, a molybdenum foil 7, and a part of the outer lead wire 8 are sealed in the sealing portion 1c of the glass tube 1. As described above, the infrared light bulb of the first embodiment is formed.

  In the infrared light bulb of the first embodiment configured as described above, by applying a voltage to the external lead wires 8 at both ends and lighting the infrared light bulb, the heating element 2 made of a carbon-based material is High temperature due to resistance. Even when the heating element 2 expands in the longitudinal direction due to this heat generation, the spring-shaped portion 6 of the internal lead wire 4 is provided between the heating element 2 and the molybdenum foil 7, so that the dimension due to the expansion of the heating element 2 is increased. The effect of the change is negated by the contraction of the spring-like portion 6. As a result, it is possible to prevent unnecessary bending force from acting on the heating element 2. As described above, since an unnecessary bending force is not applied to the heating element 2 which is in a brittle state at a high temperature, the heating element 2 is not damaged even at a high temperature.

  In the infrared light bulb of the first embodiment, a radiating block 3 formed of an excellent electrically conductive material is connected to the vicinity of the end of the heating element 2 with an excellent electrically conductive carbon-based adhesive. . For this reason, in the infrared light bulb of the first embodiment, the contact resistance can be reduced and the temperature of the connection portion can be reduced.

Next, the fitting state of the heat generating element 2 and the heat radiation block 3 in the infrared light bulb of the first embodiment will be described in more detail.
As shown in FIG. 2, at the time of manufacturing the infrared light bulb, the tip of the heating element 2 including the groove 2a formed near the end of the heating element 2 is bonded to a liquid carbon-based organic substance as a main component. The agent 9 is sufficiently applied. Then, the heating element 2 to which the adhesive 9 has been applied is inserted into the slit 3 a of the heat radiation block 3 and is brought into close contact therewith. After the heating element 2 is tightly fitted to the heat radiating block 3, drying and heating (firing) form a highly conductive sintered body mainly composed of a carbon-based substance of the adhesive 9. As a result, the heating element 2 and the heat radiation block 3 are connected by a sintered body of the adhesive 9 having high conductivity.

In the first embodiment, by forming the groove 2a in the heating element 2, the contact area between the heating element 2 and the heat radiation block 3 is increased, and the contact resistance can be reduced.
In addition, since the adhesive 9 of the carbon-based organic substance is particularly easily adhered to the heat radiation block 3 made of graphite, the adhesive 9 enters the groove 2a, and the heat generating body 2 and the heat radiation block 3 are bonded to each other with an uneven surface. The joining strength has been dramatically improved. In the first embodiment, the number of the grooves 2a formed in the vicinity of the end of the heating element 2 has been described as one example. However, the same effect can be obtained even if there are a plurality of grooves on one side and both sides. The effect increases as the number increases.
In the first embodiment, even if the clearance between the heating element 2 and the heat radiation block 3 has a width of 0 to 100 μm, there is no difference in contact resistance and bonding strength.

Next, the connection between the heat generating element and the heat radiating block in the infrared light bulb of another configuration will be described using the method of connecting the heat generating element and the heat radiating block in the infrared light bulb of the first embodiment described above.
FIG. 3 is a partially enlarged perspective view showing a connection method between the heat generating elements 21a and 21b and the heat radiation block 31 in the infrared light bulb having two rod-shaped heat generating elements 21a and 21b. FIG. 4 is a partially enlarged perspective view showing another connection method between the heat generating elements 22a and 22b and the heat radiation block 32 in the infrared light bulb having two rod-shaped heat generating elements 22a and 22b.

In the infrared light bulb shown in FIGS. 3 and 4, the configuration other than the illustration is the same as that of the first embodiment shown in FIG. 1 described above.
As shown in FIG. 3, the ends of the heating elements 21 a and 21 b in the infrared light bulb are inserted and connected to two holes 31 a and 31 a formed in the heat radiation block 31. The plurality of grooves 21c formed in each of the heating elements 21a and 21b extend in a direction orthogonal to the insertion direction of the heating elements 21a and 21b (the direction indicated by the arrow in FIG. 3).

The heating elements 21a and 21b and the heat radiation block 31 in the infrared light bulb shown in FIG. 3 are formed of the same material as that of the first embodiment, and the adhesive 9 of the second embodiment is formed of the first adhesive. As in the case of the embodiment, it is formed of a carbon-based material that becomes a mixture of crystallized carbon such as graphite and amorphous carbon when heated at a high temperature.
A plurality of (three in the example of FIG. 3) grooves 21c are formed near the ends of the cylindrical heating elements 21a and 21b. Therefore, an uneven surface is formed near the ends of the heating elements 21a and 21b, and the adhesive 9 is sufficiently applied to the tip including the uneven surface. Then, the heating elements 21a and 21b to which the adhesive 9 has been applied are inserted into the holes 31a and 31a of the heat radiation block 31, respectively, and are brought into close contact with each other. After the heating elements 21a and 21b are closely fitted to the heat radiation block 31, a sintered body of the carbon material of the adhesive 9 is formed by drying and heating (firing). As a result, each of the heating elements 21a and 21b and the heat radiation block 31 are connected by the sintered body of the highly conductive adhesive 9.

  In the example shown in FIG. 3, since the concave and convex surfaces are formed near the ends of the columnar heating elements 21 a and 21 b, the contact area between the heating elements 21 a and 21 b and the heat radiation block 31 is increased. Further, a groove 21c orthogonal to the insertion direction is formed near the ends of the heating elements 21a and 21b, and a sintered body of the adhesive 9 is formed in the groove 21c. For this reason, in the infrared light bulb shown in FIG. 3, the contact resistance between the heat generating elements 21a and 21b and the heat radiation block 31 can be reduced, and the joining strength is dramatically improved.

  In the infrared light bulb shown in FIG. 4, a plurality of (three in the example of FIG. 4) grooves 22c are formed on the outer surfaces near the ends of the two heating elements 22a and 22b. The plurality of grooves 22c formed in each of the heating elements 22a and 22b are provided in a direction orthogonal to the insertion direction of each of the heating elements 22a and 22b (the direction indicated by an arrow in FIG. 4) to form an uneven surface. The adhesive 9 is sufficiently applied to the ends of the heating elements 22a and 22b including the uneven surface near the ends.

  On the other hand, two holes 32a, 32a are formed in the heat radiation block 32, and a groove 32b is formed on each inner surface of the holes 32a, 32a. The groove 32b extends in a direction perpendicular to the direction in which the heating elements 22a and 22b are inserted (the direction indicated by the arrow in FIG. 4).

  The heating elements 22 a and 22 b configured as described above are coated with the adhesive 9, inserted into the holes 32 a and 32 a of the heat radiation block 32, and brought into close contact therewith. After the heating elements 22a and 22b are closely fitted to the heat radiation block 32, a sintered body of the carbon material of the adhesive 9 is formed by drying and heating (firing). As a result, each of the heating elements 22a and 22b and the heat radiation block 32 are connected by the sintered body of the highly conductive adhesive 9.

  In the infrared light bulb shown in FIG. 4, an irregular surface is formed near the ends of the cylindrical heating elements 22a and 22b, and a groove 32b is formed on the inner surface of the holes 32a and 32a. Thereby, the contact area between the heat generating elements 22a and 22b and the heat radiation block 32 is increased. Grooves 32b are formed in the vicinity of the ends of the heating elements 22a and 22b and on the inner surfaces of the holes 32a and 32a so as to be orthogonal to the insertion direction. A sintered body of the adhesive 9 is formed in these grooves 32b. For this reason, in the infrared light bulb shown in FIG. 4, the contact resistance between the heat generating elements 22a and 22b and the heat radiating block 32 can be reduced, and the joining strength is dramatically improved.

  In the infrared light bulb shown in FIG. 4, both ends of the plurality of heating elements 22 a and 22 b are joined to the holes of the heat radiation block 32 with the carbon-based adhesive 9. When the plurality of heating elements 22a and 22b are inserted into the heat dissipation block 32, the carbon-based adhesive 9 is still in a soft state. The strain is alleviated by the heat treatment for hardening. Then, after the balance of the tension or the compression force among the plurality of heating elements is made substantially uniform, the adhesive 9 is hardened and carbonized. As a result, even when the heating elements 22a and 22b are heated to a high temperature, the distortion of the balance between the tension and the compressive force between the heating elements does not increase so much as to destroy the heating elements 22a and 22b. Therefore, by manufacturing an infrared light bulb as described above, a long-life infrared light bulb in which a plurality of heating elements 22a and 22b are sealed in one glass tube can be easily produced.

  In the infrared light bulb shown in FIGS. 3 and 4, the same effect is obtained whether the holes 31 a and 32 a formed in the heat radiation blocks 31 and 32 are through holes or blind holes (holes with bottoms).

<< 2nd Example >>
Next, an infrared bulb according to a second embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 5 is a plan view showing an infrared light bulb of the second embodiment according to the present invention. FIG. 5 shows both end portions of the infrared light bulb of the second embodiment, and the central portion thereof is omitted because it has a continuous structure connecting the both end portions. FIG. 6 is a partially enlarged perspective view showing a connection state between the heating element and the heat radiation block in the second embodiment shown in FIG. FIGS. 7 and 8 show another configuration of the infrared light bulb according to the second embodiment, and are partially enlarged perspective views showing a method of connecting a heating element and a heat radiation block.

  As shown in FIG. 5, the infrared light bulb of the second embodiment according to the present invention has a plate-like heating element 23 and heat radiation blocks 33a and 33b divided into two parts. The other configuration in the second embodiment is the same as that in the first embodiment, and the description is omitted.

  As shown in FIGS. 5 and 6, in the infrared light bulb of the second embodiment, similarly to the above-described first embodiment, the heating element 23, the heat radiation blocks 33a and 33b, and the internal lead wires 4 are provided inside the glass tube 1. It is enclosed in. The internal lead wire 4 is connected to an external lead wire 8 via a molybdenum foil 7. The plate-like heating element 23 sealed in the glass tube 1 is formed of a carbon-based material made of a mixture of crystallized carbon such as graphite, a resistance adjusting material, and amorphous carbon. The shape of the heating element 23 is plate-like, for example, 6 mm in width, 0.5 mm in thickness, and 300 mm in length. The heat radiation blocks 33a and 33b are formed of a conductive material, and are electrically connected to one end of the heating element 23 by a method described later. The internal lead wire 4 has a coil-shaped portion 5 formed at one end thereof, and a spring-shaped portion 6 having elasticity is formed following the coil-shaped portion 5.

  As shown in FIG. 6, in the infrared light bulb of the fourth embodiment, grooves 23a and 23b are formed on the front and back of the end portion of a plate-like heating element 23, respectively. The grooves 23a and 23b extend in a direction perpendicular to the longitudinal direction of the heating element 23. The adhesive 9 is sufficiently applied near the ends of the heating element 23 including the grooves 23a and 23b. Heat-dissipating blocks 33a and 33b, which are divided into two, are sandwiched and electrically connected to the end of the heating element 23 via a highly conductive adhesive 9. The adhesive 9 is made of a carbon-based substance that becomes a mixture of crystallized carbon such as graphite and amorphous carbon when heated to a high temperature. The heat-dissipating blocks 33a and 33b are composed of two blocks having a substantially semicircular cross section and the same shape, and are formed of graphite having excellent conductivity.

  In the second embodiment, the internal lead wire 4 is formed of a tungsten wire having a thermal expansion coefficient close to that of carbon. However, other metal wires such as a molybdenum wire and titanium may be used as the internal lead wire 4 if there is no problem in heat resistance in a use environment. The external lead wire 8 is formed by a molybdenum wire.

As described above, in the infrared light bulb of the second embodiment, the heat radiation blocks 33a and 33b are sandwiched and bonded to the vicinity of the end of the plate-shaped heating element 23 with the adhesive 9 interposed therebetween. The coil-shaped portion 5 of the internal lead wire 4 is tightly wound and fixed to the heat radiation blocks 33a and 33b. As described above, the heating element 23 and the internal lead wire 4 are electrically connected to each other through the adhesive 9 and the heat radiation blocks 33a and 33b. The inner lead wire 4 is electrically connected to a molybdenum foil 7 embedded in a sealing portion of the glass tube 1 at an end of a spring-shaped portion 6 having a larger winding diameter than the coil-shaped portion 5. The other end of the molybdenum foil 7 is also connected to an external lead wire 8 in the sealing portion.
In the infrared light bulb of the second embodiment, the heating element 23, the heat radiation blocks 33a and 33b, and the internal lead wires 4 connected in series are inserted into the space inside the heat-resistant glass tube. After an inert gas such as argon or nitrogen is introduced into the space inside the glass tube, the end (sealing portion) of the glass tube 1 is melted and sealed. Note that a part of the inner lead wire 4, a molybdenum foil 7, and a part of the outer lead wire 8 are sealed by the sealing portion of the glass tube 1. As described above, the infrared light bulb of the second embodiment is formed.

  In the infrared light bulb of the second embodiment configured as described above, a voltage is applied to the external lead wires 8 (FIG. 5) at both ends to turn on the infrared light bulb, thereby generating heat generated from the carbon-based material. The body 23 becomes hot due to its resistance. Even when the heat generating element 23 expands in the longitudinal direction due to this heat generation, since the spring-like portion 6 of the internal lead wire 4 is provided between the heat generating element 23 and the molybdenum foil 7, the dimension due to the expansion of the heat generating element 23 is increased. The change is absorbed by the contraction of the spring portion 6. As a result, it is possible to prevent unnecessary bending force from acting on the heating element 23. Therefore, an unnecessary bending force is not applied to the high-temperature brittle heating element 23, and the heating element 23 does not break even at a high temperature.

  In the infrared light bulb of the second embodiment, near the end of the heating element 23, heat dissipation blocks 33a and 33b made of an excellent electrically conductive material are coated with an excellent electrically conductive carbon-based adhesive 9. It is connected. Therefore, in the infrared light bulb of the second embodiment, the contact resistance can be reduced and the temperature of the connection portion can be reduced.

Next, the bonding state of the heat generating element 23 and the heat radiation blocks 33a and 33b in the infrared light bulb of the second embodiment will be described in more detail.
As shown in FIG. 6, in the infrared light bulb of the second embodiment, grooves 23a and 23b are formed on the front and back near the end of the heating element 23. An adhesive 9 composed of a liquid of a carbon-based organic substance is sufficiently applied to the tip portions including the grooves 23a and 23b, and the heating element 23 is sandwiched and joined between the two heat radiation blocks 33a and 33b. Is done. After being joined in this manner, the heating element 23 and the heat dissipation blocks 33a, 33b are dried and heated (fired), and are reliably connected to each other by a sintered body of the adhesive 9 having a carbon-based material having high conductivity. .

In the second embodiment, by forming the grooves 23a and 23b in the heating element 23, the contact area between the heating element 23 and the heat radiation blocks 33a and 33b increases, and the contact resistance can be reduced.
Further, the adhesive 9 of the carbon-based organic substance is particularly easily adhered to the heat radiation blocks 33a and 33b made of graphite, so that the adhesive 9 enters the grooves 23a and 23b, and the gap between the heating element 23 and the heat radiation blocks 33a and 33b is uneven. The surfaces are joined, and the joining strength is dramatically improved. In the second embodiment, the number of grooves formed near the end of the heating element 23 has been described as one. However, the same effect can be obtained even if there are a plurality of grooves on one side and both sides. The effect increases as the number increases.

  In the second embodiment, the heating element 23 and the heat radiation blocks 33a and 33b are joined by pressure contact. As a result, since it is not necessary to dispose the heating element and the heat radiation block accurately at predetermined positions as in the assembling process such as fitting, the assembling can be performed easily and the manufacturing cost can be greatly reduced. Becomes possible.

FIG. 7 is a partially enlarged perspective view showing another configuration of the infrared light bulb of the second embodiment, and shows an example of a method of connecting the plate-shaped heating element 23 and the heat radiation blocks 34a and 34b divided into two parts. ing.
As shown in FIG. 7, grooves 23a and 23b are formed on the front and back near the end of the heating element 23. These grooves 23 a and 23 b extend in a direction orthogonal to the longitudinal direction of the heating element 23. An adhesive 9 composed of a liquid of a carbon-based organic substance is sufficiently applied to the tip portions including the grooves 23a and 23b.
On the other hand, each of the heat dissipation blocks 34a and 34b has a stepped portion 34d formed at a position sandwiching the heating element 23. A projection 34c is formed on the step 34d. The projecting portion 34c is formed at a position where the projecting portion 34c fits into the grooves 23a and 23b formed in the heating element 23 described above.

  The heating element 23 configured as described above is sandwiched and joined between the two heat radiation blocks 34a and 34b. At this time, the grooves 23a and 23b of the heating element 23 and the protrusions 34c of the heat radiation blocks 34a and 34b are fitted. After being joined in this manner, the heating element 23 and the heat radiation blocks 34a and 34b are dried and heated (fired), and are reliably connected by a sintered body of the adhesive 9 having a high conductivity of a carbon-based material. .

In the second embodiment shown in FIG. 7, since the grooves 23a and 23b of the heat generating element 23 and the projecting portions 34c of the heat radiating blocks 34a and 34b are fitted, the heat generating element 23 and the heat radiating blocks 34a and 34b The contact area increases, and the contact resistance can be reduced.
In addition, since the grooves 23a and 23b and the protruding portions 34c are fitted, the bonding state between the heating element 23 and the heat radiation blocks 34a and 34b via the adhesive 9 is strong, and the bonding strength is low. Improvements are being made.
In the second embodiment, a description has been given of an example in which a groove is formed in the heating element 23 and a protrusion is formed in the heat radiation blocks 34a and 34b. However, the present invention is not limited to such a configuration. They may be formed in opposite directions, and the number of each is not limited to one.

FIG. 8 is a partially enlarged perspective view showing still another configuration of the infrared light bulb of the second embodiment, and shows a method of connecting the plate-like heating element 24 and the heat radiation blocks 35a and 35b divided into two parts. .
As shown in FIG. 8, a through hole 24a is formed near the end of the heating element 24. An adhesive 9 composed of a liquid of a carbon-based organic substance is sufficiently applied to a tip portion including the through hole 24a.
On the other hand, each of the heat dissipation blocks 35a and 35b has a stepped portion 35d formed at a position sandwiching the heating element 24. A projection 35c is formed on the step 35d. The protrusion 35c is formed at a position where the protrusion 35c fits into the through hole 24a formed in the heating element 24 described above.

  The heating element 24 configured as described above is sandwiched and joined between the two heat radiation blocks 35a and 35b. At this time, the through hole 24a of the heating element 24 and the projection 35c of the heat radiation blocks 35a and 35b are fitted. After being joined in this manner, the heating element 24 and the heat dissipation blocks 35a and 35b are dried and heated (fired), and are reliably connected by a highly conductive sintered body of the carbonaceous material of the adhesive 9. .

In the embodiment shown in FIG. 8, since the through hole 24a of the heating element 24 and the projection 34c of the heat radiating blocks 35a, 35b are fitted, the contact area between the heating element 24 and the heat radiating blocks 35a, 35b increases. Thus, the contact resistance can be reduced.
In addition, since the through hole 24a and the protrusion 35c are configured to be fitted, the bonding state between the heating element 24 and the heat radiation blocks 35a and 35b via the adhesive 9 is strong, and the bonding strength is improved. Is planned.
In the embodiment shown in FIG. 8, the through hole and the protrusion are each configured as one round shape. However, the present invention is not limited to such a configuration. The same effects as those of the above embodiment can be obtained as long as the structure can be fitted such as a long convex, a long convex and a large number of holes.

Further, only the protrusion 35c shown in FIG. 8 is formed in a rod shape by another piece, and a through hole is formed in each step 35d of the heat radiation blocks 35a, 35b, so that the rod-shaped protrusion is formed by the heat radiation blocks 35a, 35a. The through hole 35b and the through hole 24a of the heating element 24 may be penetrated. With such a configuration, the processing of the heat radiation blocks 35a and 35b is simplified, and the manufacturing cost can be reduced.
In the first and second embodiments, an example has been described in which graphite having conductivity and an electrode terminal function is used as the heat radiation block. However, the material of the heat radiation block is not limited to graphite. Various materials that have heat resistance up to ° C, good electrical conductivity, and good thermal conductivity can be applied. For example, graphite alone has a low hardness and strength, so various materials whose strength has been improved, for example, a material obtained by mixing graphite with carbide, nitride, boride, and the like, and a material obtained by adding glassy carbon to graphite and firing. Etc. can be applied.

As apparent from the detailed description of the first and second embodiments, the present invention has the following effects.
ADVANTAGE OF THE INVENTION According to this invention, the fusing of the heat generation part by long-term use can be prevented, and a highly reliable infrared light bulb with a long life can be obtained.
The infrared light bulb of the present invention uses a rod-shaped carbon-based heating element instead of a conventional tungsten spiral filament, and the rod-shaped carbon-based substance has a high infrared emissivity of 78 to 84%. Therefore, the infrared radiation efficiency as an infrared light bulb is high. Further, since the rod-shaped carbon-based material has a negative temperature characteristic in which the resistance value decreases as the temperature rises, the inrush current of the infrared light bulb of the present invention can be reduced at the time of lighting.

Further, since the infrared light bulb of the present invention has a configuration in which a heat-radiating block having good conductivity is joined to the end of the rod-shaped carbon-based heating element, the contact resistance between the heating element and the heat-dissipating block during heat generation is reduced. Therefore, the temperature rise can be suppressed low, and the reliability of the lead wire mounting portion can be remarkably improved.
In addition, the infrared light bulb of the present invention has a configuration in which an uneven portion is formed between a rod-shaped heating element made of a carbon-based material and a heat-dissipating block, and bonded and fired via a carbon-based adhesive. With this configuration, the infrared light bulb of the present invention has a high strength at the joint. Further, according to the present invention, since the adhesives for joining the rod-shaped carbon-based heating element and the heat radiation block are made of the same material, their thermal expansion coefficients are substantially equal, and a long-term on-off switching operation is performed. Therefore, it is possible to provide an infrared light bulb having high reliability without an accident such as breakage. Furthermore, according to the present invention, since the rod-shaped carbon-based heating element and the heat-dissipating block have a configuration in which the projections and the projections are engaged by engagement of irregularities and are joined by a carbon-based adhesive, workability is improved and quality at the time of joining is improved. Improvement can be achieved.

  According to the method for manufacturing an infrared light bulb of the present invention, the power consumption does not abnormally change even when used for a long time, and the heat generating part is prevented from being melted by the long-term use, thereby providing a highly reliable infrared light bulb. It is possible to improve the workability and the quality at the time of assembling and joining.

<< 3rd Example >>
Next, a third embodiment according to the present invention will be described with reference to the accompanying drawings. However, the materials, sizes, manufacturing methods, and the like in the following examples are merely preferred examples of the present invention. Therefore, the practicable range of the present invention is not limited by these examples.
FIG. 9A is a plan view showing an infrared light bulb according to a third embodiment of the present invention, and FIG. 9B is a front view thereof. FIG. 10 is a perspective view of the infrared light bulb of FIG. However, since the central portion of the infrared light bulb can be understood from both sides shown in the drawings, the central portion of the infrared light bulb is not shown in any of the drawings.

  The infrared light bulb according to the third embodiment includes a substantially cylindrical glass tube 301, a metal foil 305 embedded in both ends 301 c of the glass tube 301, and a heating element 302 hermetically sealed inside the glass tube 301. A heat radiation block 303 fixed to both ends of the heating element 302, an internal lead wire 304 for connecting the heat radiation block 303 to the metal foil 305, and an external lead wire 306 for connecting the metal foil 305 to an external electric circuit. are doing.

The glass tube 301 is formed of quartz glass. The cylindrical portion of the glass tube 301 has an outer diameter of about 10 mm, a thickness of about 1 mm, and a length of about 360 mm. The sealing portions 301c at both ends of the cylindrical portion are each formed in a plate shape, and a normal-pressure argon gas is sealed inside the cylindrical portion.
The heating element 302 is made of a carbon-based substance that is a mixture containing crystallized carbon such as graphite, a resistance adjusting substance such as a nitrogen compound, and amorphous carbon. Here, the resistance value adjusting substance is mixed to adjust the resistance of the heating element 302. This resistance value adjusting substance is used to increase the resistance value of the heating element made of only carbon.

The heating element 302 according to the third embodiment has a thickness t = 0.5 mm, a width T = 1.0 mm (= 2t), 2.5 mm (= 5t), or 6.0 mm (= 12t). And a plate having a length of about 300 mm. However, FIGS. 9 and 10 show a plate-like heating element 302 having a width T = 6.0 mm (= 12 t).
The heat radiation blocks 303 fixed to both ends of the heating element 302 are made of the same carbon-based material as the heating element 302. The shape of the heat radiation block 303 is a substantially cylindrical shape having a diameter of about 6 mm and a length of about 20 mm. A notch 303a into which the longitudinal end of the heat generating element 2 is fitted is formed on an end surface 303b of the heat radiating block 303 facing the heat generating element 302 so as to pass through the center thereof. The heating element 2 is fitted into the notch 303a and is fixed to the heat radiation block 303. On the side surface of the central portion of the heat radiation block 303, an internal lead wire 304 is tightly wound to form a close contact portion 304a.

  The heat radiation block 303 has a sufficiently large cross-sectional area (about 9 times or more in the third embodiment) as compared with the cross-sectional area of the heating element 302. Therefore, the resistance value of the heat radiation block 303 is sufficiently smaller than the resistance value of the heating element 302. As a result, when a current flows through the heating element 302 and the heating element 302 generates heat as described later, the heat generation of the heat radiation block 303 itself is sufficiently small and negligible as compared with the heating element 302. Further, heat is transmitted from the heating element 302 to the heat radiation block 303, and a part of the heat is radiated from the surface of the heat radiation block 303. Accordingly, the amount of heat transmitted from the heat radiation block 303 to the internal lead wire 304 is extremely small, and the internal lead wire 304 is not overheated.

  The inner lead wire 304 is made of molybdenum or tungsten, and is a conductive wire having a diameter of about 0.7 mm. The internal lead wire 304 has a spiral coil-shaped portion 304b following the contact portion 304a wound around the heat radiation block 303. The spiral coil portion 304b has a diameter of about 0.5 to 1.0 mm larger than the contact portion 304a and is provided so as to be coaxial with the central axis of the heat radiation block 303. The spiral coil-shaped portion 304b is arranged at a predetermined distance from the side surface of the heat radiation block 303 so that it can expand and contract like a coil spring in the axial direction of the heat radiation block 303. One end of the internal lead wire 304 is fixed to the metal foil 305 by caulking. At the time of assembling, the inner lead wires 304 on both sides are pulled outward in the longitudinal direction so as to extend by about 3 mm, respectively, as compared with the normal state, and the heating element 302 is fixed.

As described above, in the third embodiment, the heating element 302 is electrically connected to the metal foil 305 and is appropriately pulled on both sides by the internal lead wires 304 to be fixed stably. At this time, the heating element 302 is fixed so that the longitudinal center line of the heating element 302 coincides with the central axis of the glass tube 301.
Further, the spiral coil-shaped portion 304b of the internal lead wire 304 has the following functions. As will be described later, when a current flows through the heating element 302 and the heating element 302 generates heat, the heat causes the temperature of each of the heating element 302 and the glass tube 301 to rise, and each of them thermally expands. At this time, a thermal stress is generated between the heating element 302 and the glass tube 301 due to a difference between the respective coefficients of thermal expansion. This thermal stress is absorbed by the elastic force of the spiral coil portion 304b. With this configuration, in the third embodiment, the connection between the heat dissipation block 303 and the metal foil 305 by the internal lead wire 304 is not damaged by thermal stress.

The metal foil 305 is a molybdenum foil of about 3 mm × 7 mm × 0.02 (thickness) mm. An internal lead wire 304 is fixed to one end of the metal foil 305, and an external lead wire 306 is fixed to the other end. The external lead wire 306 is made of molybdenum and is welded to the metal foil 305.
When a voltage is applied to the heating element 302 through the external lead wire 306, a current flows in the heating element 302. Since the heating element 302 has resistance, heat is generated from the heating element 302. At this time, the heating element 302 radiates infrared rays.

  FIG. 11A is a graph showing an intensity distribution curve of infrared rays emitted by the heating element 302 of the third embodiment. FIG. 11B is a cross-sectional view of a central portion having the heating element 302 of the infrared light bulb of the third embodiment. The x-axis and y-axis shown in FIGS. 11A and 11B are orthogonal coordinate axes in a plane perpendicular to the axial direction of the heating element 302 shown in FIG. 11A and 11B, the origin 0 corresponds to the central axis of the heating element 302. In the graph of FIG. 11A, the radial direction indicates the radiation intensity of infrared rays, and the circumferential direction indicates the angle at the center axis on a plane perpendicular to the axial direction of the heating element 302. This angle is indicated by the angle from the positive direction of the x-axis.

  In FIG. 11A, a thick solid line 307a, a thin solid line 307b, and a broken line 7c indicate intensity distribution curves when the width T of the heating element 302 is 6.0 mm, 2.5 mm, and 1.0 mm, respectively. I have. Accordingly, since the thickness (t) of the heating element 302 is 0.5 mm, the intensity distribution curve 307a is for the case where the width T (6.0 mm) of the heating element 302 is 12t, and the intensity distribution curve 307b is for the heating element 302. Is the case where the width T (2.5 mm) is 5t, and the intensity distribution curve 307c is the case where the width T (1.0 mm) of the heating element 302 is 2t.

In the third example, the intensity distribution curves 307a, 307b, and 307c were measured as follows.
First, a constant voltage is applied to an infrared lamp of 600 W to emit infrared light from the infrared lamp. In a state where infrared rays are stably radiated from the infrared light bulb, the amount of infrared rays is measured at a position perpendicular to the center line (origin 0 in FIG. 11) of the heating element 302 and at a fixed distance (about 300 mm). At this time, the amount of infrared rays that reach a small predetermined area at a predetermined position is measured. Such measurement is repeatedly performed while changing the angle with respect to the heating element 302 while keeping the distance from the origin 0 constant. As a result of the measurement, the intensity distribution curves 307a, 307b, and 307c shown in FIG. 11A were obtained.

As shown in the intensity distribution curves 307a, 307b, and 307c shown in FIG. 11A, the directivity of the intensity of the infrared light radiated from the heating element 302 is different from the width T with respect to the thickness t of the heating element 2. The greater the ratio, the stronger. In particular, when T ≧ 5t, that is, when the ratio of the width T to the thickness t is 5 times or more, the radiation intensity in the y-axis direction is significantly smaller than that in the x-axis direction.
When infrared rays are radiated anisotropically in this way, for example, if it is desired to heat only a predetermined area, the area may be placed on the x-axis. Conversely, if it is not desired to heat only a predetermined area, the area may be placed on the y-axis. Therefore, in the third embodiment, it is possible to provide directivity to the radiation intensity even without providing a reflective plate as in the conventional infrared light bulbs shown in FIGS. 25 and 26 described above.

  The heating element 302 in the third embodiment is made of a carbon-based substance that is a mixture containing crystallized carbon such as graphite, a resistance adjusting substance such as a nitrogen compound, and amorphous carbon. Thus, the carbon-based substance used as the material of the heating element 302 has a higher infrared emissivity than conventional nichrome or tungsten. Therefore, when a carbon-based material is used as the heating element 302 of the infrared light bulb, the radiation efficiency from the heating element 302 is higher than that of the conventional one.

Further, since the resistance of the heating element 302 in the third embodiment is larger than that of the conventional heating element, even if the heating element 302 has a rod-like or plate-like shape and has a smaller surface area than that of the conventional heating element, it has sufficient intensity. Can be radiated. Therefore, since the surface of the heating element 302 is smaller than that of the related art, heat radiation from the heating element 302 to surrounding gas is small, and a decrease in efficiency due to heat radiation from the heating element 302 is suppressed.
For the above reason, when a constant voltage is applied to the infrared light bulb, the radiation intensity of the third embodiment shown in FIG. 11A is equal to that of the nichrome or tungsten shown in FIG. About 20 to 30% higher than the radiation intensity of the conventional infrared light bulb having the heating element 240 constituted by

In FIG. 11A and FIG. 24A, concentric scales with respect to the radiation intensity indicate the same intensity value.
However, it is not essential for the present invention that the heating element 302 is made of a carbon-based material. Even if the heating element 302 is made of conventional nichrome or tungsten, if the width T of the heating element 302 is five times or more than its thickness t, the intensity direction curve 307a in FIG. And 307b, a radiation intensity having a relatively strong directivity is obtained.
Although the heating element 302 in the third embodiment has been described as an example in which the heating element is integrally formed in a rod shape or a plate shape, the heating element in the present invention is not limited to such a shape. Alternatively, a plurality of rod-shaped members may be bundled, and the entire bundle may form a heating element.

  Further, the infrared light bulb of the third embodiment has been described as an example having the heat radiation block 303, but the present invention is not limited to such a configuration. For example, if the amount of heat transmitted from the heating element to the internal lead wire is small due to the specifications of the infrared light bulb and the internal lead wire is not overheated, the heat radiation block may be omitted.

<< 4th Example >>
Next, a fourth embodiment according to the present invention will be described with reference to the accompanying drawings. However, the materials, sizes, manufacturing methods, and the like in the following examples are merely preferred examples of the present invention. Therefore, the practicable range of the present invention is not limited by these examples.
FIG. 12A is a plan view showing an infrared light bulb according to a fourth embodiment of the present invention, and FIG. 12B is a front view thereof. FIG. 13 is a perspective view of the infrared light bulb of FIG. However, since the central portion of the infrared light bulb can be understood from both sides shown in the drawings, the central portion of the infrared light bulb is not shown in any of the drawings.

In the fourth embodiment, the same components as those in the third embodiment shown in FIGS. 9 and 10 are denoted by the same reference numerals, and the description thereof will be omitted.
The infrared light bulb of the fourth embodiment has, in addition to the configuration of the third embodiment, a reflection film 301a for infrared rays in a certain range on the outer surface of the glass tube 301 as shown in FIGS. The reflection film 301a is a thin gold film deposited on the outer surface of the glass tube 301 to a thickness of about 5 μm. The reflection film 301a reflects about 70% of the infrared rays radiated from the heating element 302. As shown in FIGS. 12 and 13, the reflection film 301a is disposed between the heat radiation blocks 303 on both sides, that is, disposed at a position facing the light emitting portion in the longitudinal direction of the heating element 302. The reflection film 301a has a semi-cylindrical shape, and the inner surface of the reflection film 301a is disposed so as to face the side surface 302a of the heating element 302, which has a wider width.

  FIG. 14A is a graph showing an intensity distribution curve 307d of infrared rays emitted from the heating element 302 of the fourth embodiment. FIG. 14B is a cross-sectional view of a central portion having the heating element 302 of the infrared light bulb according to the fourth embodiment. The x-axis and y-axis shown in FIGS. 14A and 14B are orthogonal coordinate axes in a plane perpendicular to the axial direction of the heating element 302 shown in FIG. 14A and 14B, the origin 0 corresponds to the central axis of the heating element 302. 14A, the radial direction indicates the radiation intensity of infrared rays, and the circumferential direction indicates the angle with respect to the center axis on a plane perpendicular to the axial direction of the heating element 302. This angle is indicated by the angle from the positive direction of the x-axis. Note that the concentric scale in FIG. 14A with respect to the radiation intensity shows the same value as the scale in FIG. 11A.

A constant power of 600 W is applied to the infrared light bulb. Since the measuring method is the same as that of the third embodiment, the description is omitted.
As shown by the intensity distribution curve 307d of FIG. 14A, the infrared rays from the heating element 302 are directed in the positive direction of the x-axis, that is, the direction opposite to the reflecting plate 301a with respect to the heating element 302 (FIG. 14). (Right direction in (b)). The maximum radiation intensity is about 1.5 times that of the infrared light bulb of the third embodiment shown in FIG.

On the other hand, among the infrared rays from the heating element 302, the infrared rays in the negative direction of the x-axis, that is, hardly radiate in the direction blocked by the reflective film 301a (the left side in FIG. 14B).
Also, comparing the intensity distribution curve 307d of FIG. 14A with the conventional intensity distribution curve 271 shown in FIG. 26A, the conventional intensity distribution curve 271 has a wide area near the positive direction of the x-axis. The radiation intensity is substantially uniform over the angular range. On the other hand, in the fourth embodiment, the radiation intensity gradually decreases as the distance from the positive x-axis increases. Therefore, in the fourth embodiment, the radiation intensity is larger than that of the conventional one, and the range of the maximum direction is narrow.
Therefore, the infrared light bulb of the fourth embodiment is suitable for, for example, locally heating an object arranged in the positive direction of the x-axis.

In the infrared light bulb of the fourth embodiment, the reflection film 301a is formed by a formation process described below.
(1) The glass tube 301 is formed in a cylindrical shape. (Step 1)
(2) The heating element 302 and the like are arranged in the glass tube 301 and hermetically sealed. (Step 2)
(3) Gold is deposited on the outer surface of the glass tube 301 to form a reflective film 301a. (Step 3)
By forming the reflective film 301a as described above, the reflective film 301a can be formed using the outer shape of the glass tube 301. Therefore, the accurate semi-cylindrical reflective film 301a can be easily formed.

In the above-described step of forming the reflective film 301a, the step 3 may be performed before the step 2.
Further, the reflection film 301a may be formed by transfer or the like instead of vapor deposition. Here, the transfer is performed as follows.
(1) A mixture of resin, gold, and glass is formed into a film shape and attached to the surface of the glass tube 301.
(2) By baking the film attached to the surface of the glass tube 301, the resin contained in the film is evaporated.
As described above, the transfer is performed, and the gold film is formed on the surface of the glass tube 301.

In the fourth embodiment, the inner surface, which is the reflecting surface of the reflecting film 301a, is in close contact with the outer surface of the glass tube 301, and thus does not come into contact with air. In the above-described conventional infrared light bulb shown in FIG. 25, since the reflection plate 280 is arranged with a predetermined space from the glass tube 201, the reflection surface of the reflection plate 280 is contaminated by extraneous matter from the outside. In the fourth embodiment, such a problem is solved.
In the fourth embodiment, the reflective film 301a is formed and held in a shape along the outer surface of the glass tube 301, that is, a semi-cylindrical shape. Therefore, it is possible to maintain substantially the same shape for a long time as the reflection plate 280 used in the conventional infrared light bulb.

As described above, in the fourth embodiment, the reflection film 301a is held for a long time, and the reflectance of the reflection surface does not decrease. Therefore, the infrared light bulb of the fourth embodiment maintains excellent characteristics for a long period of time as compared with the conventional infrared light bulb provided with the reflection plate 280.
In the fourth embodiment, the example in which the reflective film 301a is formed on the outer surface of the glass tube 301 has been described. However, the present invention is not limited to this configuration, and the reflective film 301a may be formed on the inner surface of the glass tube. good. However, in the case of such a configuration, in the above-described step of forming the reflective film, step 3 must be performed before step 2.

  When a reflective film is formed on the inner surface of the glass tube 301, the reflective film is not exposed to the air, and the reflective surface is not stained by deposits or the like. Therefore, similar to the case where the reflection film is formed on the outer surface of the glass tube 301, the characteristics are not changed over time and excellent characteristics can be maintained for a long period of time when the reflection plate 280 is used in the conventional infrared light bulb. However, since the reflective film formed on the inner surface of the glass tube comes into contact with the high-temperature gas inside the glass tube, the thickness of the reflective film may be reduced due to evaporation or the like, and the reflectance may be reduced. Therefore, when the reflection film is formed on the inner surface of the glass tube, it is necessary to set the distance between the reflection film and the heating element to be sufficiently large.

In the fourth embodiment, the example in which gold is used as the material of the reflective film 301a has been described. However, in addition to gold, metals such as titanium nitride, silver, and aluminum can be used, and the reflectance to infrared rays is high. What is necessary is just to be stable to high temperature.
In the fourth embodiment, the shape of the reflective film 301a has been described as an example of a semi-cylindrical shape. However, the present invention is not limited to this shape, and various shapes can be applied in consideration of the reflection direction of infrared rays. The shape of the reflective film may be, for example, a shape having a part of a curve such as a circle, a parabola, or an ellipse, in addition to a semi-cylindrical shape. Further, a shape having a combination of a plurality of straight lines such as a part of a polygon (for example, a U-shape), a combination with a curve (for example, a U-shape), or a planar shape can be used. The shape of the reflective film 301a may be any shape that is suitable for obtaining a desired directional distribution of infrared radiation intensity. In order to form the reflective film 301a having such a shape, a portion of the glass tube where the reflective film 301a is formed by vapor deposition or the like may be formed so as to correspond to a desired shape of the reflective film. Can be easily obtained by the method of forming.

<< 5th Example >>
Next, a fifth embodiment according to the present invention will be described with reference to the accompanying drawings. However, the materials, sizes, manufacturing methods, and the like in the following examples are merely preferred examples of the present invention. Therefore, the practicable range of the present invention is not limited by these examples.
(A) in FIG. 15 is a plan view showing an infrared light bulb of a fifth embodiment according to the present invention, and (b) is a front view thereof. FIG. 16 is a perspective view of the infrared light bulb of FIG. However, since the central portion of the infrared light bulb can be understood from both sides shown in the drawings, the central portion of the infrared light bulb is not shown in any of the drawings.

In the fifth embodiment, the same components as those in the third embodiment shown in FIGS. 9 and 10 are denoted by the same reference numerals, and description thereof will be omitted.
The infrared light bulb of the fifth embodiment has an infrared reflective film 301b in addition to the configuration of the third embodiment, similarly to the fourth embodiment. However, in the infrared light bulb of the fifth embodiment, the reflection film 301b is formed on the outer surface of the glass tube 301 at a position different from that of the fourth embodiment. The reflecting film 301a of the fourth embodiment is disposed so as to face the side portion 2a of the heating element 302 having the wider width (FIGS. 12 and 13), whereas the reflecting film 301b of the fifth embodiment is arranged. Are arranged to face the side portion 2b on the narrow side of the heating element 302.

In the reflective film 301b of the fifth embodiment, the material, thickness, reflectance, shape, and forming method are the same as those of the reflective film 301a of the fourth embodiment.
FIG. 17A is a graph illustrating an intensity distribution curve 307e of infrared rays emitted from the heating element 302 according to the fifth embodiment. FIG. 17B is a cross-sectional view of a central portion having a heating element 302 of the infrared light bulb of the fifth embodiment. The x-axis and y-axis shown in FIGS. 17A and 17B are orthogonal coordinate axes in a plane perpendicular to the axial direction of the heating element 302 shown in FIG. The x-axis corresponds to the thickness direction of the heating element 302, and the y-axis corresponds to the width direction. 17A and 17B, the origin 0 corresponds to the central axis of the heating element 302. In FIG. 17A, the radial direction indicates the radiation intensity of infrared rays, and the circumferential direction indicates the angle of the central axis on a plane perpendicular to the axial direction of the heating element 302. This angle is indicated by the angle from the positive direction of the x-axis. The concentric scale in FIG. 17A with respect to the radiation intensity indicates the same value as the scale in FIG. 11A.

A constant power of 600 W is applied to the infrared light bulb. Since the measuring method is the same as that of the third embodiment, the description is omitted.
In the infrared light bulb of the fifth embodiment, the positive direction of the y-axis (the direction of the arrow of the y-axis in FIGS. 16 and 17) is the direction in which the inner surface of the reflective film 301b faces.
As indicated by the infrared radiation intensity distribution curve 307e in FIG. 17A, the infrared radiation from the heating element 302 has a lower radiation intensity near the positive y-axis than in the x-axis direction. Naturally, radiation is suppressed by the reflective film 301b on the y-axis side in the negative direction.
Comparing the intensity distribution curve 271 of the conventional infrared light bulb shown in FIG. 26A with the fifth embodiment, the angle range in the direction in which the radiant intensity is larger in the fifth embodiment is larger than that in the fifth embodiment. Is wider.
Therefore, in the infrared light bulb of the fifth embodiment, for example, the object to be heated is centered on the positive y-axis of the infrared light bulb, and the entire plane perpendicular to the y-axis of the object to be heated is substantially covered. Suitable for heating uniformly.

<< Sixth Embodiment >>
Next, a heating / heating device using an infrared light bulb according to the present invention will be described as a sixth embodiment.
As the infrared light bulb in the heating / heating device of the sixth embodiment, the infrared light bulb described in the third embodiment is used, and the infrared light bulb is provided with the reflection plate 280 shown in FIG.
Each of the infrared light bulbs of the first to fifth embodiments described above is configured to have substantially the same outer shape as a conventional infrared light bulb. Therefore, in a heating / heating apparatus having a conventional infrared light bulb, replacing the infrared light bulb with any one of the first to fifth embodiments can be performed by any ordinary technician in the related field. It is easy.

As a heating / heating device that can replace the conventional infrared light bulb with the infrared light bulb of the present invention as described above, for example, the following devices are available.
(1) heating equipment such as stoves, kotatsu, air conditioners, infrared therapy equipment, bathroom heaters,
(2) Drying equipment such as clothes, futons, food, garbage processing machines, heated deodorizers, bathroom dryers, etc.
(3) disinfection equipment by heat,
(4) Cooking devices such as ovens, microwave ovens, oven toasters, toasters, roasters, warmers, yakitori, stoves, defrosters, roasters, etc.
(5) Physical containers such as dryers and permanent heaters,
(6) Equipment for fixing characters, images, etc. on sheets,
(A) LBP (Laser beam printer), PPC (Plain paper copier), Fax and other devices that display through a toner,
(B) a device that uses heat to transfer heat from the original film to the transfer object,
(7) heater used for soldering,
(8) dryer for semiconductor wafers, etc.
(9) An apparatus for heating pure water when cleaning a wafer or the like during a semiconductor manufacturing process, and (10) an industrial paint dryer.
That is, any device that heats and heats an object to be heated using an infrared light bulb as a heat source can be the device to be replaced as described above.

FIG. 18 is a perspective view showing a positional relationship between an infrared light bulb and an infrared reflecting plate 308a in the heating / heating device of the sixth embodiment. In FIG. 18, the central portion of the infrared light bulb is omitted. Since the infrared light bulb used here is the infrared light bulb described in the third embodiment, the description is omitted.
The reflecting plate 308a in the sixth embodiment has a semi-cylindrical shape made of aluminum having a thickness of about 0.4 to 0.5 mm, and has a reflecting surface whose inner surface is mirror-finished. The infrared reflectance of the reflection plate 308a is about 80 to 90%. The reflection plate 308 a is arranged at a predetermined distance from the outer surface of the glass tube 301 in parallel with the center line of the heating element 302. The reflection plate 308a is installed substantially around the center line of the heating element 302. As shown in FIG. 18, the reflection surface, which is the inner surface of the reflection plate 308a, is arranged so as to face one side portion 302a of the heating element 302 where the width is large.

In the sixth embodiment, the example in which the reflecting plate 308a is formed of aluminum has been described. However, in addition to aluminum, a material such as gold, titanium nitride, silver, and stainless steel, which has a high infrared reflectance and is stable at high temperatures. Is good enough.
In the sixth embodiment, the case where the shape of the reflecting plate 308a is a semi-cylindrical shape has been described. However, as other shapes, for example, a figure whose cross section has a part of a curve such as a circle, a parabola, an ellipse, or the like, In order to obtain a desired directional distribution of infrared radiation intensity such as a figure combining a plurality of straight lines such as a part of a polygon (for example, a U-shape), a figure combining the straight lines (for example, a U-shape), or a planar shape. Any shape may be used as long as it is suitable for

By providing the reflection plate 308a as described above, the directional distribution of the radiation intensity of infrared rays has a shape substantially equal to the intensity distribution curve 307d of the fourth embodiment shown in FIG. Have. Therefore, with the above configuration, infrared rays having the same directional distribution of radiation intensity as the infrared bulb of the fourth embodiment can be obtained using the infrared bulb of the third embodiment. As a result, the heating / heating apparatus of the sixth embodiment is suitable for, for example, locally heating an object to be heated arranged at a position facing the reflection surface of the reflection plate 308a.
Note that the infrared light bulb of the third embodiment has directivity in the x-axis direction in radiation intensity as shown in FIG. Therefore, in the heating / heating apparatus of the sixth embodiment, the radiation intensity of infrared rays by the reflection plate 308a is higher than that of the conventional apparatus. Further, when the reflectance of the reflector 308a is reduced to some extent due to aging, adhesion of dirt, and the like, the influence on the directional distribution of the radiation intensity in the sixth embodiment is, for example, the same as the conventional infrared light bulb shown in FIG. It is smaller than when used.

<< Seventh embodiment >>
Next, a seventh embodiment of the heating / heating device using the infrared light bulb according to the present invention will be described.
The infrared light bulb in the heating / heating device of the seventh embodiment has a configuration in which the reflecting plate 308a described in the sixth embodiment is rotated by 90 degrees with respect to the center line of the infrared light bulb.
FIG. 19 is a perspective view showing a positional relationship between an infrared light bulb and an infrared reflecting plate 308b in the heating / heating device of the seventh embodiment. However, the central portion of the infrared light bulb is omitted in FIG. Since the infrared light bulb used here is the infrared light bulb described in the third embodiment, the description is omitted.

As shown in FIG. 19, the reflection surface, which is the inner surface of the reflection plate 308b, is disposed so as to face the side portion 302b of the heating element 302 where the width is smaller.
By providing the reflection plate 308b as described above, the directional distribution of the radiation intensity of infrared rays is substantially equal to that of the fifth embodiment shown in FIG. That is, the infrared light having the same directional distribution of radiation intensity as the infrared light bulb of the fifth embodiment can be obtained using the infrared light bulb of the third embodiment. Therefore, the heating / heating device of the seventh embodiment is used, for example, for heating the entire flat surface of the object to be heated arranged substantially parallel to the heating element 302 and opposed to the reflection plate 308b. Are suitable.

  Further, the infrared light bulb of the third embodiment shown in FIG. 10 itself has directivity in radiation intensity as shown in FIG. Therefore, in the heating / heating apparatus of the seventh embodiment, when the reflectance of the reflecting plate 308b is reduced to some extent due to aging or adhesion of dirt, the influence on the directional distribution of the radiation intensity is shown in FIG. The size is smaller than when the conventional infrared light bulb shown is used.

  Although the invention has been described in terms of a preferred form with some detail, the present disclosure of the preferred form should vary in the details of construction, and any combination of elements or change in order will not affect the claimed invention. It can be realized without departing from the scope and spirit.

  The present invention is widely used as an infrared bulb used as a heat source in a heating device for heating an object and a heating device for heating a room or the like, and can provide a device having a long life by efficiently radiating infrared rays, It is possible to provide a versatile device capable of selecting the directivity of infrared radiation according to a heating target.

It is a front view showing the structure of the lead wire lead-out part of the infrared light bulb in the 1st example concerning the present invention. FIG. 2 is a partially enlarged view showing a connection portion between a heat generator and a heat radiation block of the infrared light bulb of FIG. 1. FIG. 6 is a partially enlarged view of a connection portion between a heating element and a heat radiation block in an infrared light bulb having another configuration according to the first embodiment of the present invention. FIG. 9 is a partially enlarged view of a connection portion between a heat generating body and a heat radiating block in an infrared light bulb of still another configuration according to the first embodiment of the present invention. It is a front view showing the structure of the lead wire lead-out part in the infrared light bulb of the 2nd example concerning the present invention. FIG. 6 is a partially enlarged view showing a connection portion between a heating element and a heat radiation block in the infrared light bulb of FIG. 5. It is the elements on larger scale of the connection part of the heat generating body and the radiation block in the infrared light bulb of another structure of 2nd Example. It is the elements on larger scale of the connection part of the heat generating body and the radiation block in the infrared light bulb of further another structure of 2nd Example. It is the top view (a) and front view (b) which show the infrared light bulb in the 3rd Example concerning this invention. It is a perspective view of the infrared light bulb in the 3rd example concerning the present invention. (A) is a graph which shows the intensity-distribution curve of the infrared radiation which the heating element of 3rd Example radiates. (B) is a cross-sectional view of a central portion of the infrared light bulb of the third embodiment. It is the top view (a) and front view (b) which show the infrared light bulb in the 4th Example concerning this invention. It is a perspective view of the infrared light bulb in the 4th example concerning the present invention. (A) is a graph showing an intensity distribution curve of infrared rays emitted by the infrared light bulb of the fourth embodiment. (B) is a cross-sectional view of a central portion of the infrared light bulb of the fourth embodiment. It is the top view (a) and front view (b) which show the infrared light bulb in the 5th Example concerning this invention. It is a perspective view of the infrared light bulb in the 5th example concerning the present invention. (A) is a graph which shows the intensity distribution curve of the infrared light which the infrared light bulb of 5th Example radiates. (B) is a cross-sectional view of a central portion of the infrared light bulb of the fifth embodiment. It is a perspective view which shows the positional relationship of the infrared light bulb and the infrared reflective plate in the heating / heating apparatus of the 6th Example concerning this invention. It is a perspective view which shows the positional relationship of the infrared light bulb and the infrared reflector in the heating / heating apparatus of the 7th Example which concerns on this invention. It is a partial view showing the structure of the lead wire lead-out part of the conventional infrared light bulb. FIG. 4 is a partial view showing the structure of a lead wire lead-out portion of a conventional infrared light bulb in which two heating elements are sealed in a glass tube. It is a top view which shows the conventional infrared light bulb. It is a perspective view of the conventional infrared light bulb. (A) is a graph which shows the intensity-distribution curve of the infrared radiation which the heating element in the conventional infrared light bulb radiates. FIG. 24 (b) is a transverse sectional view of a central portion of the infrared light bulb of FIG. It is a perspective view which shows the positional relationship between the infrared reflector and the infrared reflector in the conventional infrared light bulb. (A) is a graph showing an intensity distribution curve of infrared rays when the infrared reflector is used in the conventional infrared light bulb shown in FIG. 25. FIG. 26 (b) is a transverse sectional view of a central portion of the infrared light bulb of FIG. Some or all of the drawings are depicted in schematic terms for illustrative purposes and may not necessarily accurately represent the actual relative sizes or positions of the elements shown therein. Please consider.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Glass tube 2 Heating element 3 Heat dissipation block 4 Internal lead wire 5 Coil-shaped part 6 Spring-shaped part 7 Molybdenum foil 8 External lead wire 9 Adhesive

Claims (21)

A heating element having a substantially plate shape, a width of not less than 5 times the thickness, and a carbon-based material including a resistance value adjusting substance;
A glass tube that hermetically encloses the heating element, and
An electrode embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit,
Infrared light bulb with. A connector fixed to both ends of the heating element and electrically connected to the heating element,
A lead wire fixed to the connection tool and the electrode so as to pull both ends of the heating element with a predetermined tension, and electrically connecting the connection tool and the electrode;
The infrared light bulb according to claim 1, further comprising: The connector has a cross-sectional area larger than a cross-sectional area of the heating element on a surface orthogonal to a direction of a current flowing through the heating element, and radiates heat from the heating element to prevent overheating of the lead wire. 3. The infrared light bulb according to claim 2, further comprising a heat radiation block. The infrared light bulb according to claim 1, further comprising a reflection film on an inner surface or an outer surface of the glass tube so as to reflect the infrared rays so that a radiation intensity of the infrared rays emitted from the heating element shows a predetermined distribution. The reflective film according to claim 4, wherein the reflective film has a semi-cylindrical surface shape substantially coaxial with a longitudinal center line of the heating element over substantially the same length as a portion of the heating element that emits infrared rays. Infrared light bulb. Over substantially the same length as the infrared-emitting portion of the heating element, the cross-section of the reflective film has a shape consisting of a portion of a parabola substantially focused on the longitudinal centerline of the heating element. The infrared light bulb according to claim 4. Over substantially the same length as the infrared-emitting portion of the heating element, the cross-section of the reflective film is from a portion of an ellipse that substantially places one of the focal points on the longitudinal centerline of the heating element. 5. The infrared light bulb according to claim 4, wherein the infrared light bulb has a shape including: 6. The infrared light bulb according to claim 5, wherein a center portion of a cross section of the reflection film is disposed so as to face a side portion of the heating element having a wider width. 6. The infrared light bulb according to claim 5, wherein a central portion of a cross section of the reflection film is disposed so as to face a side portion of the heating element having a smaller width. A heating element having a substantially plate shape, a width of not less than 5 times the thickness, and a carbon-based material including a resistance value adjusting substance;
A glass tube that hermetically encloses the heating element, and
An electrode embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit,
A heating / heating device provided with an infrared light bulb having: The infrared light bulb is fixed to both ends of the heating element, respectively, a connector that is electrically connected to the heating element, and
A lead wire fixed to the connection tool and the electrode so as to pull both ends of the heating element with a predetermined tension, and electrically connecting the connection tool and the electrode;
The heating / heating apparatus according to claim 10, further comprising: The heating / heating apparatus according to claim 10 or 11, further comprising a reflector for reflecting the infrared rays so that the intensity of the infrared rays emitted from the heating element shows a predetermined distribution. 13. The heating / heating apparatus according to claim 12, wherein the reflector has a semi-cylindrical shape substantially coaxial with a central axis of the infrared light bulb. 13. The heating and heating device according to claim 12, wherein a cross section of the reflector is formed by a part of a parabola substantially focused on a central axis of the infrared light bulb. 13. The heating and heating apparatus according to claim 12, wherein a cross section of the reflector is formed by a part of an ellipse having substantially one focus on the central axis of the infrared light bulb. 13. The heating / heating apparatus according to claim 12, wherein a central portion of a cross section of the reflector is disposed so as to face a side portion of the heating element having a wider width. 13. The heating / heating apparatus according to claim 12, wherein a central portion of a cross section of the reflector is arranged to face a side portion of the heating element having a smaller width. Forming glass into a substantially cylindrical shape to form a glass tube;
A substantially plate-shaped heating element whose width is at least five times as large as its thickness is placed on the glass so that its longitudinal center line is substantially coaxial with the central axis of the glass tube. A process of hermetically sealing in a pipe, and
Forming a reflecting film for reflecting infrared rays in a substantially semi-cylindrical shape on the outer surface of the cylindrical shape of the glass tube so as to substantially include a range in the axial direction in which the heating element is arranged,
A method for producing an infrared light bulb having: Forming glass into a substantially cylindrical shape to form a glass tube;
Forming a reflective film for reflecting infrared rays on the cylindrical outer surface or inner surface of the glass tube into a predetermined substantially semi-cylindrical shape, and
A substantially plate-shaped heating element whose width is at least five times as large as the thickness is arranged so as to be included in an axial range where the reflection film is arranged, and the heating element is formed of the glass. A process of hermetically sealing in a pipe,
A method for producing an infrared light bulb having: A heating element having a substantially plate shape and a width of at least 5 times the thickness,
A heat dissipation block having good conductivity electrically connected to one end of the heating element,
A glass tube that hermetically encloses the heating element, and
An electrode embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit,
Infrared light bulb with. A heating element having a substantially plate shape and a width of at least 5 times the thickness,
A heat dissipation block having good conductivity electrically connected to one end of the heating element,
A glass tube that hermetically encloses the heating element, and
An electrode embedded in both ends of the glass tube, electrically connected to both ends of the heating element, and electrically connected to an external electric circuit,
A heating / heating device provided with an infrared light bulb having:

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