JP2008270030A - Tube type incandescent heater, heating device - Google Patents

Abstract

An object of the present invention is to reduce the load on power supply metal terminals and external leads when a tube-type incandescent heater is incorporated into an actual machine.
One end of an outer lead (191, 192) is welded to the other end of a pair of metal foils (171, 172) in which both ends of a tungsten light emitting part (13) inserted into a quartz glass bulb (12) are welded. The bulbs 12 of the metal foils 171 and 172 are formed by using the reduced pressure sealing method to form the sealing portions 161 and 162 to constitute the halogen lamp 11. The halogen lamp 11 is attached by welding the outer leads 191 and 192 to the metal terminal plates 201 and 201 to which power is supplied, and screwing the metal terminal plates 201 and 201 into the support portions 211 and 212 with screws 221 and 222. At this time, the holding portions 25 are integrally formed on the metal terminal plates 201 and 202, and the sealing portions 161 and 162 are elastically held. The outer leads 191 and 192 and the metal terminal plates 201 and 201 are welded in contact with the open ends 26 of the sealing portions 161 and 162.
[Selection] Figure 1

Description

  The present invention relates to a tube-type incandescent heater having an electric resistance heating element inside a radiation transmissive valve, and a heating apparatus using the same.

In a conventional halogen lamp with a heater filament housed inside a bulb, a metal foil is connected to the heater filament, an external lead is connected to the metal foil, an integrated part is built into the radiation permeable bulb, and the outer surface of the bulb is heated. It is melted by heating and sealed with pressure by left and right molds. At this time, the power feeding unit is used by being electrically connected by welding a metal terminal to an external lead in accordance with the shape of a holding unit of a heating device on which an infrared heater such as a copying machine or a heater is mounted. (For example, Patent Document 1)
JP 2004-279596 A

  In the technique of Patent Document 1 described above, a sealing part is formed by pressure-sealing with a mold, and the strength of the sealing part is weak. At this time, there is a problem that a load is applied to the sealing portion and it is damaged. For this reason, since it is necessary to maintain a certain distance or more between the metal terminal and the sealing portion via an external lead, there is a problem that the connection portion of the metal terminal and the outer lead are easily bent due to a load during installation. It was.

  An object of the present invention is to provide a tube-type incandescent heater capable of reducing a load on a metal terminal and an outer lead when incorporated in an actual machine, and a heating apparatus using the same.

  In order to solve the above-described problems, a tubular incandescent heater according to the present invention includes a coil-shaped filament housed in a cylindrical bulb made of heat-resistant glass, and a pair of metal foils electrically connected to both ends of the filament. And an outer lead led out for power supply connected to the other end of each of the metal foils, and a reduced pressure sealing part in which the valve of the metal foil part is sealed using a reduced pressure sealing method, The outer lead is welded in a state where it is in contact with at least a part of the sealing portion, and a metal terminal plate to which power is supplied is provided.

  According to the present invention, by sealing by the reduced pressure sealing method, the mechanical strength of the sealing portion is ensured, and a configuration in which a part of the metal terminal serving as the power feeding portion is applied to the sealing portion is mounted. It is possible to reduce the load on the metal terminal plate and the outer lead.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 to 6 are diagrams for explaining a first embodiment of the tube-type incandescent heater according to the present invention. FIG. 1 is a schematic configuration diagram, FIG. 2 is an exploded perspective view of the main part of FIG. 3 is an exploded perspective view of FIG. 1, FIG. 4 is a perspective view of the main part of FIG. 1, FIG. 5 is a front view of FIG. 1, and FIG. 6 is a side view of FIG.

  In FIG. 1, reference numeral 11 denotes a halogen lamp having an outer diameter of φ6 mm and a thickness of about 1 mm. In the halogen lamp 11, a plurality of light-emitting portions 13 formed by winding tungsten and a heat-resistant and electrically conductive non-light-emitting portion 14 are electrically connected in series in a longitudinal direction within a tubular long quartz glass bulb 12. Contains connected filaments. The non-light-emitting portion 14 is supported using a plurality of anchors 15 so as to be positioned at the central portion in the bulb 12. The light emitting part 13 and the non-light emitting part 14 may be formed of the same material.

Each bulb 12 is filled with a trace amount of a halogen substance such as bromine Br or chlorine Cl and an inert gas such as argon Ar or nitrogen N _{2 at a} room temperature of 25 ° C. and a pressure of about 0.9 × 10 ⁵ Pa. Has been.

  Both end portions in the axial direction of the valve 12 form a pair of sealing portions 161 and 162 by a reduced pressure sealing method, and in the sealing portions 161 and 162, for example, conductive molybdenum having an expansion coefficient approximate to that of the valve 12. Strip-shaped metal foils 171 and 172 formed of (Mo) are respectively embedded.

  Here, sealing under reduced pressure is a sealing method called shrink seal. The lamp is sealed once except for the sealing part, and the molybdenum foil is hermetically sealed in a state where the inside of the lamp including the sealing part is decompressed. It is something to be made. This sealing method can improve the strength of the sealing portion because the thickness of the quartz glass is not biased unlike the sealing method by the pinch seal. Further, since the halogen or the inert gas can be sealed from the opening of the bulb when sealing at a position other than the sealing portion, it is possible to eliminate the exhaust pipe seal.

  The metal foils 171 and 172 are connected to the inner ends thereof at both axial ends where a plurality of light emitting portions 14 and non-light emitting portions 15 are electrically connected in series via a pair of inner leads 181 and 182, respectively. In addition, a pair of outer leads 191 and 192, which are lead wires for feeding, are connected to the outer end portions, respectively. The outer leads 191 and 192 extend from the sealing portions 161 and 162 to the outside in an airtight state. When power is supplied to the outer leads 191 and 192, light heat is emitted from the plurality of light emitting units 13.

  Reference numerals 201 and 202 denote plate-shaped metal terminal plates for power feeding. The metal terminal plates 201 and 202 are fixed to insulating support portions 211 and 212 whose one ends are fixed to the chassis or frame of the actual machine by fixing means using screws 221 and 222, respectively, and the outer leads of the halogen lamp 11 191 and 192 are electrically connected by welding.

  Although FIG. 2 shows the metal terminal plate 201 side, it is assumed that the metal terminal plate 202 side is similarly configured, and here, the attachment of the metal terminal plate 201 side and the halogen lamp 11 will be described.

  The metal terminal plate 201 has a substantially L-shape, and a screw hole 23 into which the screws 222 and 223 are inserted is formed on one side thereof. The metal terminal plate 201 at a position away from the screw hole 23 is narrow, and the portion is vertically folded into a engaging portion 24, and the tip of the sealing portion 161 is valley-folded with a substantially radial length. Is formed in an L shape, and the L-shaped portion is curved slightly smaller than the sealing portion 161 to integrally form the holding portion 25 having elasticity.

  As shown in FIG. 3, the holding portion 25 holds the sealing portion 161 against its elasticity. At this time, the outer lead 191 and the metal terminal plate 201 are welded while being engaged with the open end 26 of the sealing portion 161 and the engaging portion 24 of the metal terminal plate 201.

  Then, the metal terminal plate 201 is fixed by screwing into the support portion 211 through the screw 221 into the screw hole 23 of the metal terminal plate 201. Thereby, the halogen lamp 11 is attached. Since the sealing portion 161 is sealed under reduced pressure, mechanical strength can be obtained and reliable fixing can be realized. Although not shown, a power supply line from a power source may be connected to the metal terminal plate 201 by welding, but may be connected together with the screws 221 in a close-fit manner.

  As shown in FIGS. 5 and 6, when the screw 221 is rotated clockwise, the metal terminal plate 201 also tries to rotate in the direction of the arrow in the drawing due to friction between the screw 221 and the metal terminal plate 201. However, since the open end 26 of the sealing portion 161 and the engaging portion 24 of the metal terminal plate 201 are engaged, the rotation of the metal terminal plate 201 is prevented and the screw 221 is securely attached to the support portion 211. Can be attached. Since the open end 26 prevents the metal terminal plate 201 from being rotated, an excessive force acting on the outer lead 191 can be suppressed.

7 and 8 are diagrams for explaining a second embodiment of the tubular incandescent heater according to the present invention. FIG. 7 is an exploded perspective view corresponding to FIG. 2, and FIG. 8 is an exploded view of the main part corresponding to FIG. It is a perspective view. The same parts as those in the above-described embodiment will be described with the same reference numerals.
7 and 8 show the configuration of the sealing portion 161 side of the halogen lamp 11 and the metal terminal plate 71, the metal terminal plate on the sealing portion 162 side is also configured in the same manner as the metal terminal plate 71. Is.

  In this embodiment, the holding portion 25 that holds the sealing portion 161 is eliminated, and the metal terminal plate 71 corresponding to the metal terminal plate 201 described above is used. The metal terminal plate 71 is composed of a screw hole 23 and an engaging portion 24 with one side folded.

  The sealing portion 161 of the halogen lamp 11 is electrically connected to the metal terminal plate 71 by welding the outer lead 191 with the open end 26 being in contact with the engaging portion 24. The halogen lamp 11 can be fixed by screwing the screw 221 into the support portion 211 from the screw hole 23.

  In this embodiment, the metal terminal plate 71 has a simple configuration in which the holding portion 25 that holds the sealing portion 161 is eliminated. However, since the sealing portion 161 is formed by decompression, the sealing portion The mechanical strength is high, and electrical and mechanical connection to the metal terminal plate 71 can be performed satisfactorily.

  FIGS. 9-11 is for demonstrating 3rd-5th embodiment regarding the tube type incandescent heater of this invention, and FIGS. 9-11 is a front view respectively equivalent to FIG. The same reference numerals are given to the same components as those of the above-described embodiments, and different portions will be described here.

  First, in FIG. 9, in this embodiment, the outer lead 191 is welded to the metal terminal plate 91 in a state where the side surface of one side of the flat rectangular metal terminal plate 91 is in contact with the open end 26 of the sealing portion 161. Connected.

  In the embodiment of FIG. 10, a protruding portion 92 is integrally formed on one side of a flat rectangular metal terminal plate 91, and the outer surface of the protruding portion 92 is in contact with the open end 26 of the sealing portion 161. A lead 191 is connected to the metal terminal plate 91 by welding.

  In the embodiment of FIG. 11, the side surface of the protruding portion 92 of the embodiment of FIG. 10 is in contact with a part of the outer peripheral surface of the sealing portion 161. The position where the metal terminal plate 91 presses the outer peripheral surface of the sealing portion 161 when the screw 221 is rotated clockwise is set as a position that contacts a part of the outer peripheral surface.

  In each of the third to fifth embodiments described above, the screw 211 has a simple configuration in which the flat metal terminal plate 91 is brought into contact with a part of the sealing portion 161 of the halogen lamp 11 formed by the decompression unit. It can also serve as a detent for the metal terminal plate 91 when screwing into the support portion 211.

  FIGS. 12 and 13 are schematic diagrams for explaining an embodiment of the heating device of the present invention using the tubular incandescent heater described above. FIG. 13 is an x- It is x 'sectional drawing.

  In each embodiment related to the tubular incandescent heater of the present invention described above, the metal terminal plate has been described as having the same configuration for both outer leads of the halogen lamp. However, it is sufficient that at least one of the embodiments is the above each embodiment. The other may be via a base or the like.

  12 and 13, reference numeral 100 denotes a heating device. Reference numeral 101 denotes a cylindrical heating roller made of a metal such as aluminum or iron. The outer peripheral surface of the heating roller 101 is covered with a coating material 102 made of a heat-resistant resin. Inside the heating roller 101, a halogen lamp 11 serving as a heat source is supported on the support portions 211 and 212 via the metal terminal plates 201 and 201 described in FIG.

  Reference numeral 103 denotes a cylindrical pressure roller made of a metal such as aluminum or iron, which is pressed against the heating roller 101 and opposed to the lower side. The outer peripheral surface of the pressure roller 103 is covered with an elastic body layer 104 made of, for example, silicon rubber. A resin coating for smoothing the surface may be formed on the surface of the elastic layer 104 so that the passing paper is easily separated from the pressure roller 103 after fixing.

  The heating roller 101 is rotatably supported by the support means 104 and the pressure roller 103 is rotatably supported by the support means 105, respectively. In addition, a rotation gear (not shown) is attached to one end of the heating roller 101 and the pressure roller 103 in the same direction, and the rotation gear and the rotation gear attached to the rotation shaft of the motor are meshed to rotate the motor. The heating roller 101 and the pressure roller 103 can be rotated in the directions of arrows A and B in FIG.

  When the halogen lamp 11 of the heating roller 101 is energized, the heating roller 101 generates heat and heats up (heats up). Therefore, the heating roller 101 and the pressure roller 103 are rotated in the directions of arrows A and B in FIG. 13, and the copy paper P on which the toner T is transferred in a predetermined distribution state from a transfer drum (not shown) is heated up. By feeding between 101 and the pressure roller 103, the copy paper P and the toner T1 applied in the previous step are heated from above and below, and the heated toner T2 is fixed on the copy paper P after being melted. It is drawn as letters and designs.

  In the heating device described above, the pressure roller 103 may be configured as a heating roller similar to the heating roller 101.

  In this embodiment, the outer leads 191 and 192 of the halogen lamp 11 are welded to the metal terminal plates 201 and 202, and the metal terminal plates 201 and 202 are simply screwed to the support portions 211 and 212 to be incorporated into the actual machine. Is possible. Further, when the metal terminal plates 201 and 202 are screwed, the metal terminal plates 201 and 202 are brought into contact with a part of the halogen lamp 11 to have a function of preventing rotation, so that the metal terminal plates 201 and 202 and the outer leads 191 are provided. , 192 can be reduced.

  The heating device is used for fixing image forming apparatuses such as copying machines, but is not limited to this, and is not limited to home appliances, precision instruments for business use or experiments, equipment for chemical reactions, etc. It can be used as a heat source for heating and heat retention when attached to the same.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram for demonstrating 1st Embodiment regarding the tube type incandescent heater of this invention. The exploded perspective view of the principal part of FIG. The exploded perspective view of FIG. The perspective view of the principal part of FIG. The front view of FIG. The side view of FIG. The disassembled perspective view of the principal part for demonstrating 2nd Embodiment regarding the tube type incandescent heater of this invention. The perspective view of the state which assembled FIG. The front view for demonstrating 3rd Embodiment regarding the tube type incandescent heater of this invention. The front view for demonstrating 4th Embodiment regarding the tube type incandescent heater of this invention. The front view for demonstrating 5th Embodiment regarding the tube type incandescent heater of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram for demonstrating one Embodiment of the heating apparatus of this invention using the tube type incandescent heater of this invention. X-x 'sectional drawing of FIG.

Explanation of symbols

11 Halogen lamp 12 Bulb 13 Light emitting part 14 Non-light emitting part 15 Anchor 161, 162 Sealing part 171, 172 Metal foil 181, 182 Inner lead 191, 192 Outer lead 201, 202, 91 Metal terminal plate 211, 212 Support part 221, 222 Screw 23 Screw hole 24 Engagement part 25 Holding part 26 Open end 92 Projection part 100 Heating device 101 Heating roller 103 Pressure roller

Claims (6)

A coiled filament housed in a cylindrical bulb made of heat-resistant glass,
A pair of metal foils electrically connected to both ends of the filament;
Outer leads led out for power supply connected to the other ends of the metal foils,
At least the valve of the metal foil portion, and a reduced pressure sealing portion that is sealed using a reduced pressure sealing method;
A tubular incandescent heater, comprising: a metal terminal plate to which electric power is supplied by welding the outer lead in a state of being in contact with a part of the sealing portion.   2. The tubular incandescent heater according to claim 1, wherein the metal terminal plate is fixed to a support portion fixed to a chassis, a frame or the like by a fixing means.   The tubular incandescent heater according to claim 1 or 2, wherein a holding portion for holding a part of the sealing portion is integrally formed on the metal terminal plate.   4. The metal terminal plate according to claim 1, wherein the metal terminal plate is formed of a flat conductive metal, and a side surface of the metal terminal plate is brought into contact with an open end of the sealing portion or a part of an outer peripheral surface. The tube-type incandescent heater described in 1.   5. The tubular incandescent heater according to claim 1, wherein a base is attached to the other outer reed when the metal terminal plate is attached to one of the outer leads. First and second rollers which are arranged one above the other and at least one is heated;
The halogen lamp according to any one of claims 1 to 5, which is disposed in the first or second roller;
A heating apparatus, comprising: a copy sheet onto which toner has been transferred in advance; and a means for fixing the toner by moving between the first and second rollers.

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