JP2007048500A - Tube-shaped heater device and toner fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten total length of a tube-shaped heater device without changing its effective light emitting area. <P>SOLUTION: Incandescent lamps L1, L2 are arranged in parallel with each other, and external lead wires 17, 18 at one side of the incandescent lamps L1, L2 are connected to lead wires 21, 22 respectively through connection terminal boards 25, 27. External lead wires 17, 18 at the other side of the incandescent lamps L1, L2 are connected to a lead wire 28 through a connection terminal board 30. The lead wire 28 is connected to the connection terminal board 30 at a protruded part 31 formed so as to protrude between pinch seal parts 13, 14 of the incandescent lamps L1, L2 from the connection terminal board 30. Since the lead wire 28 is connected to the terminal board 30 at the part located between the pinch seal parts 13, 14 of the incandescent lamps L1, L2, the total length of a tube-shaped heater is shortened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tube heater device used as a fixing heater of a toner fixing device of a copying machine or a printer, and a toner fixing device using the same.

In the conventional tube heater device, welding between the external lead-in wire led out of the base and the lead wire is performed on the extended line of the sealing portion. (For example, Patent Document 1)
JP 2004-311220 A

  In the technique of Patent Document 1 described above, the distance between the sealing portion and the lead wire is long in order to prevent the core wire of the lead wire from coming out of the base. As a result, the entire length of the tubular heater is extended and the entire apparatus becomes longer. When the space in the longitudinal direction of the tubular heater is restricted, the effective heat generation region may be restricted.

  An object of the present invention is to provide a tube heater device capable of shortening the total length of the tube heater without changing the length of an effective heat generating portion, and a toner fixing device using the tube heater device. It is in.

  In order to solve the above-described problems, the tubular heater device according to the present invention includes a coiled filament and an inert gas enclosed in a glass bulb in which a pinch seal portion is formed at each end, and from the pinch seal portion. Provided in the pinch seal portion in which the first and second tube-type light bulbs in which the external lead wire connected to the filament is led out along the tube axis and the first and second tube-type light bulbs are arranged in parallel First and second connection terminal plates that electrically connect the external lead-in wire and the lead wire led out from one of the pinch seal portions, respectively, and the other of the first and second tubular bulbs A third connection terminal plate for electrically connecting the external lead-in wire and the lead wire respectively led out from the pinch seal portion, and the third connection terminal plate includes the third connection terminal plate. And the external lead-in wire led out from the other pinch seal part of each of the first and second tube-type light bulbs, forming a projecting part protruding between the pinch seal part of the second tube-type light bulb and the second tube-type light bulb Are connected by the protruding portion.

  According to the present invention, it is possible to shorten the overall length of the tubular heater without changing the effective light emitting area of the tubular heater.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 4 are for explaining an embodiment of the tubular heater device according to the present invention. FIG. 1 is a partially cutaway front view, and FIG. 2 is a main part on the left side of FIG. 3 is an enlarged front view, FIG. 3 is an enlarged front view of the main part on the right side of FIG. 1, FIG. 4 is a front view of the main part of FIG. 3, and FIG. FIG.

In FIG. 1, L1 and L2 are straight tube incandescent bulbs that serve as heaters. Incandescent light bulbs L1 and L2 contain coiled long filaments 11 and 12 in bulbs 1 and 2 made of quartz glass, respectively, and are crushed and sealed (pinch seals) formed by crushing them with a mold from opposite directions. ) Portions 13 and 14 are formed. In the bulbs 1 and ₂ , an inert gas such as argon Ar and nitrogen N ₂ together with a mixture of a trace amount of a halogen substance such as bromine Br and chlorine Cl is about 0.9 × 10 ⁵ Pa at room temperature of 25 ° C. Pascal) is sealed.

  The filament 11 includes a plurality of coil-shaped portions 111 formed by winding a tungsten wire, a coarsely wound or linear jump portion 112 between the coil-shaped portions 111, and leg portions 113 at both ends, and a plurality of portions at an intermediate portion. The support member 114 is supported.

  Similarly, the filament 12 includes a plurality of coil-shaped portions 121 formed by winding a tungsten wire, a coarsely wound or linear jump portion 122 between the coil-shaped portions 121, and leg portions 123 at both ends, and an intermediate portion. It is supported by a plurality of support members 124 at the portion.

  The filament 11 has a rough winding shape or a linear jump portion 122 so that the light emission distribution is smaller on both sides with respect to the light emission length of the incandescent bulb L1, for example. The filament 12 has a rough winding shape or a linear jumping portion 122 so that the light emission distribution becomes larger on both sides with respect to the light emission length of the incandescent lamp L2, for example. The number of coil-shaped parts 111 and 121 is also varied as necessary.

  As shown in FIGS. 2 and 3, metal foils 15 and 16 such as molybdenum foils are hermetically sealed in the pinch seal portions 13 and 14, respectively. A leg 113 at the end of the filament 11 is connected to one end of the metal foil 15 by means such as welding, and the other end is connected to molybdenum or the like led out in a direction substantially along the tube axis outside the incandescent lamp L1. An external lead wire 17 made of a tungsten wire is connected by means such as welding. Similarly, a leg 123 at the end of the filament 12 is connected to one end of the metal foil 16 by means such as welding, and the other end is led out in a direction substantially along the tube axis outside the incandescent lamp L2. The external lead wire 18 made of molybdenum or tungsten wire is connected by means such as welding. Reference numerals 19 and 20 denote rectangular parallelepiped insulating base members made of ceramics such as steatite in which the incandescent lamps L1 and L2 are arranged in parallel.

  As shown in FIG. 2, the base member 19 forms fitting recesses 191 and 192 into which the pinch seal portions 13 and 14 of the incandescent lamps L1 and L2 are loosely fitted. Lead wire insertion holes 193 and 194 that are larger in diameter than the outer diameters of the lead wires 21 and 22 and allow play are provided at the bottoms of the fitting recesses 191 and 192.

  A lead wire 211 at one end of the lead wire 21 is attached to a crimp portion 241 of the crimp terminal 24. The crimp terminal 24 and the external lead-in wire 17 are disposed in the fitting recess 191 while being welded to a conductive connection terminal plate 25 made of, for example, Ni (nickel). Further, the lead wire 221 at one end of the lead wire 21 is attached to the crimping part 261 of the crimping terminal 26, and the crimping terminal 26 and the external lead-in wire 17 are respectively connected to the conductive connecting terminal plate 27 made of Ni in the fitting recess 191. Arranged in a welded state.

  As shown in FIG. 3, the base member 20 forms a fitting recess 201 into which the pinch seal portions 13 and 14 of the incandescent lamps L1 and L2 are loosely fitted. At the bottom of the fitting recess 201, there is provided an introduction wire insertion hole 202 having a diameter larger than the outer diameter of the lead wire 28 and allowing play.

  The conducting wire 281 at one end of the lead wire 28 is attached to the crimping portion 291 of the crimping terminal 29. The crimp terminal 29 and the external lead wires 17 and 18 are disposed in the fitting recess 201 while being welded to the protruding portion 31 of the conductive connection terminal plate 30 made of, for example, Ni.

  Here, as shown in FIG. 4, the protruding portion 31 of the connection terminal plate 30 is protruded so as to be positioned between the pinch seal portions 13 and 14. Accordingly, the crimp terminal 29 attached to the protruding portion 31 can be welded at a position moved to the incandescent bulbs L1 and L2 side to the extent indicated by the dimension a in the figure, so that the overall length of the tubular heater device itself can be shortened. Become.

  Although not shown, the fitting recesses 191 and 192 of the base member 19 are bonded to form an integral structure with the base member 19 with the pinch seal portions 13 and 14 of the incandescent lamps L1 and L2 inserted therein. The agent is filled. The fitting recess 201 of the base member 20 is filled with an adhesive so as to be integrated with the base member 20 with the pinch seal portions 13 and 14 of the incandescent lamps L1 and L2 inserted therein. . As the adhesive, for example, a paste having alumina as a main component is heat-resistant cement.

  The incandescent light bulbs L1 and L2 supply power from a power source (not shown) to the lead wires 21 and 22 and the lead wire 28 at both ends of the incandescent light bulbs L1 and L2, and turn on the two lamps. Whether one of the lamps and one of the lead wires 28 is turned on can be switched as necessary.

  6 and 7 are front views corresponding to FIG. 4 for explaining another embodiment of the tubular heater device of the present invention, and FIG. 7 is a sectional view taken along line yy ′ of FIG. Components are denoted by the same reference numerals, and different portions will be described here.

  In this embodiment, for example, a concave portion 32 is formed in a portion where at least the protruding portion 31 is formed by bending, and a connection terminal plate 301 in which the portion where the external lead wires 17 and 18 are welded is higher than the other portion. It is.

  In this case, the incandescent lamps L1, L2 are approximately the distance b based on the recess 32 as shown in the yy ′ cross-sectional view of FIG. 6 as compared to FIG. 5 showing the xx ′ cross-sectional view of FIG. By moving to the center side, the internal volume of the base plate 20 can be reduced.

  The present invention is not limited to the above-described embodiment, and the connection terminal plate may be not only Ni but also, for example, stainless steel. In short, the connection of an object to be connected such as welding is good and the conductivity is good. That's fine. Further, the connection between the external lead-in wires 17 and 18 and the connection terminal plate 30 is performed in a state where the external lead-in wires 17 and 18 are extended in the axial direction of the tubular light bulbs L1 and L2. Accordingly, it is possible to further reduce the overall length of the tubular heater by moving the connection terminal plate 30 closer to the pinch seal portions 13 and 14.

  FIG. 12 shows an electronic copying machine 200 in which a tube-type incandescent heater device 100 is used in which two sides of the incandescent light bulbs L1 and L2 are used by using the base member 19 of FIG. 2 and the other side by using the base member 20 of FIG. FIG. 2 is a schematic configuration diagram for explaining an embodiment of a toner fixing device of the present invention when mounted on a toner cartridge.

  In the figure, reference numerals 81 and 82 denote long heating rollers arranged vertically opposite to each other, and these heating rollers 81 and 82 are respectively provided with a covering material 83 such as silicon rubber or Teflon (registered trademark) on the surface of an aluminum or iron tubular body. , 84.

  Further, a tube-type incandescent heater device 100 composed of incandescent lamps L1 and L2 is disposed on a substantially central axis of the heating rollers 81 and 82 via a support member (not shown). When connected and energized, the filaments of the incandescent lamps L1 and L2 generate heat, and the heating rollers 81 and 82 heat up (temperature rise).

  The copy paper P on which the toner T is transferred in a predetermined distribution state from a transfer drum (not shown) is fed between the heated rollers 81 and 82 that are heated up rotating in the direction of the arrow, thereby applying the copy paper P and the previous process. The toner T1 thus heated is heated from above and below, and the heated toner T2 is melted and fixed on the copy paper P, and is drawn as a predetermined character or pattern.

  In the case of this embodiment, the toner fixing device 200 attached to the copying machine can shorten the overall length of the tubular incandescent heater device 100 without changing the light emission distribution of the incandescent bulbs L1 and L2.

  The use of incandescent light bulbs L1 and L2 with different ratings can be used for adjustment that corresponds to the size of the paper for fixing, or that rises from residual heat in a short time.

  The incandescent bulb attached to the tube-type incandescent heater device 100 is not limited to two lamps (books), but may be a plurality of lamps of two or more lamps. The side corresponding to 2 may be formed according to the number of lamps, and the side corresponding to FIG. Moreover, holding | maintenance of the tube type incandescent heater apparatus 100 can be easily fixed to a terminal block, a mounting base, etc. by utilizing a base member or a terminal member.

  The heating rollers 81 and 82 need not be heating rollers, and one of them may be a pressure roller.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view for explaining an embodiment of a tubular heater device of the present invention. The front view which expanded and showed the principal part of the left side of FIG. The front view which expanded and showed the principal part of the right side of FIG. The front view which expanded and showed the principal part of FIG. X-x 'sectional drawing of FIG. The front view equivalent to FIG. 4 for demonstrating other embodiment of the tubular heater apparatus of this invention. FIG. 7 is a sectional view taken along the line y-y ′ in FIG. 6. 1 is a schematic configuration diagram for explaining an embodiment of a toner fixing device of the present invention.

Explanation of symbols

L1, L2 Incandescent bulb 1, 2 Bulb 11, 12 Filament 13, 14 Pinch seal part 15, 16 Metal foil 17, 18 External lead wire 19, 20 Base member 21, 22, 28 Lead wire 281 Conductor 24, 26, 29 Crimping Terminals 30 and 301 Connection terminal plate 31 Protruding part 32 Concave part 100 Tubular incandescent heater device 200 Toner fixing device 81 and 82 Heating roller 83 and 84 Coating material

Claims (3)

A coiled filament and an inert gas are enclosed in a glass bulb having a pinch seal portion formed at each end, and an external lead wire connected to the filament is led out along the tube axis from the pinch seal portion. And a second tube bulb,
The first and second tube-type light bulbs are provided in the pinch seal portion arranged in parallel, and each of the external lead wires and the lead wires led out from one of the pinch seal portions is electrically connected. First and second connection terminal plates;
A third connection terminal plate for electrically connecting the external lead wire and the lead wire respectively led out from the other pinch seal portion of each of the first and second tubular bulbs;
The third connection terminal plate is formed with a protruding portion that protrudes between the pinch seal portions of the first and second tubular light bulbs, and the other of the first and second tubular light bulbs. A tubular heater device characterized in that the external lead wires respectively led out from the pinch seal portions are connected by the protruding portions.   2. The third connection terminal plate is characterized in that a recess is formed in the projecting portion so that a portion to which the external lead-in wire is connected is lower than a portion to which the lead wire is connected. Tube heater device. First and second rollers which are arranged one above the other and at least one is heated;
The tube heater device according to claim 1 or 2, wherein the tube heater device is disposed in the first or second roller,
A toner fixing device, comprising: means for fixing the toner by moving a copy sheet onto which toner has been transferred in advance between the first and second rollers.

Images