JP2007066594A - Infrared lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the length of an infrared lamp that uses a heating element containing a carbon-based substance as the main constituent in the inside of a radiation transmitting bulb. <P>SOLUTION: Coil-shaped carbon coils 13, each formed of a carbon-based heating element, are housed in a bulb 12 made of quartz glass having radiation transmitting property, and for instance, a tube diameter ϕ of 8mm by connecting them serially, mechanically and electrically between a plurality of molybdenum coils 14. The carbon coils 13 and the molybdenum coils 14 serially connected in the bulb 12 are sealed by sealing parts 161 and 162 with an inactive gas enclosed therein. Thereby, the plurality of carbon coils 13 arranged in the long bulb 12 can be made to emit light, and this long infrared lamp which has been unsuitable when the carbon coils 13 are used can be provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an infrared lamp provided with a heating element whose main component is a carbon-based substance inside a radiation transmissive bulb.

Conventional infrared lamps that contain a coiled carbon-based heating element inside a radiation transmissive bulb have a wavelength in the far infrared region and have no inrush current. Yes. Usually, the carbon-based heating element is formed of a continuous integral heating element, and the light distribution and heat distribution are adjusted by the coil pitch density of the carbon-based heating element. (For example, Patent Document 1)
JP 2002-367568 A

  In the technique of Patent Document 1 described above, it is difficult to adjust the coil distribution of the carbon-based heating element in order to adjust the heat distribution, and thus it is difficult to adjust the heat distribution. In addition, in the case of a heating element made of an integral carbon system, there has been a problem that it is difficult to lengthen the heater lamp due to the strength problem of the coiled carbon heating element.

  An object of the present invention is to provide an infrared lamp that realizes a long infrared lamp using a coiled carbon-based heating element.

  In order to solve the above-described problems, in the infrared lamp of the present invention, a radiation transmissive bulb, a plurality of conductive metal members disposed in the bulb, and the plurality of metal members are electrically connected. And a plurality of coil-shaped heating elements mainly composed of carbon, and a sealing portion that seals the metal member and the heating element while enclosing an inert gas. And

  In addition, a radiation transmissive bulb, a carbon-based heating element mainly composed of carbon disposed in the bulb, and an inert gas are sealed, and the metal member and the heating element are enclosed. The heat generating element has a double structure.

  According to the present invention, it is possible to realize a long infrared lamp using a coiled carbon-based heating element.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 are diagrams for explaining a first embodiment of an infrared lamp according to the present invention. FIG. 1 is a block diagram showing an overall configuration, and FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a perspective view of the main part of FIG.

  In FIG. 1, reference numeral 11 denotes an infrared lamp, which is a tube type frequently used as a heater for, for example, food warming or heating, and has a bulb 12 made of quartz glass having a radiation permeability, for example, a tube diameter of φ8 mm. A plurality of carbon coils 13 wound in a coil shape having a wire diameter of about 1.0 mm formed of a sintered body containing a carbon-based material are disposed in the bulb 12.

  Molybdenum ten coils 14, which are conductive and non-light emitting metal members, are interposed between the plurality of carbon coils 13.

  As shown in FIGS. 2 and 3, the molybdenum coil 14 is composed of anchors 141 and 142 that are concentrically held in the blob 12 in an axial direction, a connecting portion 143 that integrally forms them, and support portions 144 and 145 on both sides. Composed.

  The light emitting portion is configured by sequentially connecting and connecting the support portions 142 or 143 of the molybdenum coil 14 adjacent to the carbon coil 13. The support part 142 or 143 of the carbon coil 13 and the molybdenum coil 14 is joined by press-fitting the support part 142 or 143 into the communication hole of the carbon coil 13 wound in a coil shape. The ends of the coupled carbon coil 13 and molybdenum coil 14 are positioned so that the molybdenum coil 14 is positioned, and the inner lead wires 151 and 152 are connected to the molybdenum coil 14 positioned at both ends, respectively. An inert gas such as argon is sealed in the valve 12.

  A pair of rectangular flat sealing portions 161 and 162 are formed by pinch seals that crush both axial ends of the valve 12 in the diametrical direction, and the expansion coefficient approximates that of the valve 12 in the sealing portions 161 and 162. Rectangular metal foils 171 and 172 made of conductive, for example, molybdenum (Mo), are embedded.

  The metal foils 171 and 172 have inner lead wires 151 and 152 connected to the inner end portions and a pair of outer lead wires 181 and 182 connected to the outer end portions by welding, respectively. The outer lead wires 181 and 182 extend from the sealing portions 151 and 152 to the outside in an airtight manner.

  When electric power is supplied to the outer lead wires 181 and 182 of the infrared lamp configured as described above, the portion of the carbon coil 13 emits light. FIG. 4 shows the heat distribution at this time. FIG. 4 shows the relative value of the amount of heat around the center when the amount of heat (E) at the center of the infrared lamp is 100%.

  According to this embodiment, the carbon coil 13 can be used in the long bulb 12 by alternately connecting the carbon coil 13 and the non-light emitting molybdenum coil 14, and infrared rays can be generated from the carbon coil with a wide distribution. it can. Further, the light distribution and the heat distribution can be adjusted by adjusting the non-light emitting portion.

Even when a non-light-emitting tungsten coil having a current density i _W of 2.0 × 10 ⁷ [A / m ² ] or less is used instead of the molybdenum coil, infrared rays are generated from the carbon coil with a wide distribution, etc. There is an effect.

  5 to 7 are diagrams for explaining a second embodiment of the present invention, respectively, FIG. 5 is a configuration diagram showing an overall configuration, FIG. 6 is a side view showing an enlarged main part of FIG. FIG. 7 is a perspective view of the main part of FIG. In addition, the same code | symbol is attached | subjected and demonstrated to the component same as embodiment mentioned above.

  In this embodiment, in place of the molybdenum coil 14 of the above embodiment, a tungsten coil 51 wound in a coil shape, which is a conductive metal member, is specified, and an intermediate portion of the tungsten coil 51 having a wire diameter of about 0.3 mm is provided. An anchor 52 is attached to the part.

  The carbon coil 13 and the tungsten coil 51 constitute a light emitting part by alternately connecting them together. The tungsten coil 51 is positioned at both ends, and inner lead wires 531 and 532 are formed integrally with the tungsten coil 51 positioned at both ends, respectively. Inner lead wires 531 and 532 are welded to one end of rectangular foil-shaped metal foils 171 and 172 made of molybdenum, respectively.

  As shown in FIGS. 6 and 7, the carbon coil 13 and the tungsten coil 51 are screwed together so as to be wound together. This eliminates the need for special joining means such as adhesive or welding.

FIG. 8 shows the result of measuring the emission wavelength at an arbitrary point when a current of 6 A was passed through the outer lead wires 181 and 182 of this embodiment and only the carbon coil, only the tungsten coil, and the carbon coil and the tungsten coil were turned on simultaneously. Is shown. Note that the metal heating element mainly composed of tungsten is turned on when the current density i _W satisfies the relationship of i _W > 2.0 × 10 ⁷ [A / m ² ], and the carbon-based heating element has a current density of i _C is lit when _{the i} C> 3.5 × meet ^{10 6 [a / m 2]} .

  As is apparent from FIG. 8, when the tungsten coil and the carbon coil are lit at the same time, it is possible to obtain a distribution in which the wavelengths emitted from the respective coils are combined. In short, it is possible to obtain light having an infrared wavelength obtained from a carbon coil even in a state in which a short carbon coil is joined to a tungsten coil to increase the overall length.

  In this embodiment, a metal heating element such as tungsten is provided between a plurality of carbon-based heating elements and is electrically and mechanically connected, so that infrared rays in a wide wavelength range can be emitted.

  FIGS. 9 to 13 are diagrams for explaining a third embodiment of the present invention. FIG. 9 is a configuration diagram showing the overall configuration, and FIG. 10 is an enlarged side view showing the main part of FIG. 11 is an equivalent circuit diagram of FIG. 9, FIG. 12 is an explanatory diagram for explaining the relationship between the dimensions of the carbon coil and the tungsten coil, and FIG. 13 is an explanatory diagram for explaining the effect of the embodiment of FIG. In addition, the same code | symbol is attached | subjected and demonstrated to the component same as embodiment mentioned above.

  In this embodiment, as shown in FIG. 10, carbon coils 91 and 92 wound in a coil shape with a coil pitch P of 0.85 mm, an inner diameter Di of 1.95 mm, and a wire diameter Dl of 0.95 mm are screwed together. And sealed in a double coil shape. The other ends of tungsten coils 95 and 96 having inner leads 93 and 94 integrally formed at one end are screwed to both ends of the doubled carbon coils 91 and 92, respectively. The inner leads 93 and 94 are welded to one ends of rectangular foil-shaped metal foils 171 and 172 made of molybdenum, respectively.

  FIG. 11 shows an electrical equivalent circuit of the carbon coils 91 and 92 and the inner leads 93 and 94. The carbon coils 91 and 92 are connected in parallel and have a double resistance value.

  12 shows the specifications of the double carbon coils 91 and 92 and the conventional single carbon coil, and FIG. 13 shows the patent results of the carbon coils 91 and 92 and the single carbon coil based on the specifications of FIG. As shown in the figure, since the current can be doubled even if the applied voltage value is the same at 12 V, the power can be doubled.

  In the case of this embodiment, two carbon coils are screwed together to form a double cylindrical resistor, thereby obtaining a highly reliable heating element without applying more load than necessary to the carbon coil. Can do. In addition, since the carbon coil has a double structure, the mechanical strength can be improved and the overall length can be increased, and the overall length of the valve can be increased. Further, even when the dimensions are the same as the conventional one, high output can be realized.

  Note that the idea of using a double-structured carbon coil can also be applied to the carbon coil 13 of the first and second embodiments. In this case, even if a double structure is not applied to all the carbon coils 13, only a desired carbon coil can be formed into a double structure according to the purpose.

  Next, in addition to the technical idea described in the claims, the technical idea grasped by the above-described embodiment will be described below together with the effects thereof.

(1) A radiation permeable bulb, a plurality of conductive metal members disposed in the bulb, and a plurality of coil-like components mainly composed of carbon based electrically connected between the plurality of metal members A heat generating member, and a sealing portion that encloses the inert gas and encloses the metal member and the heat generating member, the metal member having a coil shape, and the coil-shaped heat generating member; Is an infrared lamp characterized by being connected by screwing.
Thereby, the electrical coupling between the heating element and the metal member can be realized without using any special bonding means.

(2) In a state where the radiation permeable bulb, the coiled heating element mainly composed of carbon disposed in the bulb, the inert gas is sealed, and the metal member and the heating element are accommodated An infrared lamp, comprising: a sealed portion, a double structure of the heating element, and a coiled tungsten coil screwed to both ends thereof.
As a result, the weldable tungsten coil is screwed to and bonded to both ends of the carbon-based heating element, so that the electrical and mechanical connection of the carbon-based heating element can be easily realized.

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram for demonstrating 1st Embodiment of the infrared lamp of this invention. The side view which expands and shows the principal part of FIG. 2 is a perspective view of the main part. Explanatory drawing for demonstrating the effect of FIG. The whole block diagram for demonstrating 2nd Embodiment of the infrared lamp of this invention. The side view which expands and shows the principal part of FIG. The perspective view of the principal part of FIG. Explanatory drawing for demonstrating the effect of FIG. The whole block diagram for demonstrating 3rd Embodiment of the infrared lamp of this invention. The side view which expands and shows the principal part of FIG. FIG. 10 is an equivalent circuit diagram of FIG. 9. Explanatory drawing for demonstrating the relationship of the dimension of a carbon coil and a tungsten coil. Explanatory drawing for demonstrating the effect of FIG. 9 embodiment.

Explanation of symbols

11 Infrared lamp 12 Bulb 13, 91, 92 Carbon coil 14 Molybdenum ten coil 151, 152, 531, 532, 93, 94 Inner lead wire 161, 162 Sealing part 171, 172 Metal foil 181, 182 Outer lead wire 51 Tungsten coil 52 Anchor

Claims (4)

A radiation permeable valve;
A plurality of conductive metal members disposed in the bulb, and a plurality of coil-shaped heating elements mainly composed of a carbon system electrically connected between the plurality of metal members;
An infrared lamp, comprising: an inert gas, and a sealing portion sealed in a state in which the metal member and the heating element are accommodated.   The infrared lamp according to claim 1, wherein the metal member is molybdenum or tungsten used in a non-light emitting state. A radiation permeable valve;
A coil-shaped heating element mainly composed of carbon-based material disposed in the bulb;
A sealing portion sealed with an inert gas and sealed in a state in which the metal member and the heating element are accommodated;
An infrared lamp characterized in that the heating element has a double structure.   The infrared lamp according to claim 1 or 2, wherein a part or all of the plurality of heating elements has a double structure.

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