Halogen lamp and heating device

Abstract

Provided is a halogen lamp and a heating device. The halogen lamp has a light emitting portion formed of a coil-shaped filament inside a light emitting tube. The halogen lamp can reduce heat loss of a conductive rod electrically connected to the light emitting portion, accelerate starting of the light emitting portion, and increase thermal energy in the light emitting portion. The light emitting portion has a conductive rod extending into the inside of the light emitting tube installed in a manner that allows current to pass through. At least a portion of the conductive rod has a recrystallized portion in which crystal organization is recrystallized.

Description

TECHNICAL FIELD

[0001] The present application relates to a halogen lamp having a coil-shaped filament forming a light emitting portion in a light emitting tube. BACKGROUND

[0002] Conventionally, a fixing unit that fixes ink to a recording medium by heating is mounted on an image forming apparatus of a printer or a copying machine, and a halogen lamp is mounted inside the fixing unit.

[0003] A representative configuration of the halogen lamp is disclosed in Japanese Patent No. 3873635 (Patent Document 1). In the halogen lamp shown in the document, a light emitting portion and a non-light emitting portion are formed in a light emitting tube by a coil-shaped filament, and a short-circuiting conductor is mounted in the non-light emitting portion for the purpose of reducing the resistance of the non-light emitting portion to suppress power consumption.

[0004] In such a halogen lamp, as shown in Patent Document 1, generally, a configuration is employed in which the end portion of the light emitting tube is sealed by a metal foil, and the other end portion of an internal lead wire engaged with the metal foil becomes a configuration electrically connected to the light emitting portion.

[0005] The internal lead wire does not emit light, and is generally formed thin in a wire shape like the wire of the filament, and thus has a large resistance, thereby generating power consumption or heat loss caused by heat generation. Thus, there are problems that the start-up time of the light emitting portion (filament) after the lamp is turned on becomes slow, the energy use efficiency becomes low, and the thermal energy in the light emitting portion decreases.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT DOCUMENTS

[0008] Patent Document 1: Japanese Patent No. 3873635 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] The present application relates to a halogen lamp having a coil-shaped filament forming a light emitting portion in a light emitting tube.

[0011] TECHNICAL SOLUTION TO THE PROBLEMS

[0012] To solve the above-mentioned problems, in the halogen lamp of the present invention, the halogen lamp has a light-emitting part composed of a coil-shaped filament inside the light-emitting tube. The light-emitting tube is characterized by having a sealing part with a metal foil sealed at its end, and a conductive rod extending into the interior of the light-emitting tube is installed in the light-emitting part in a manner that enables it to be energized. At least a portion of the conductive rod has a recrystallized part obtained by recrystallizing the crystalline structure.

[0013] In addition, in order to solve the above-mentioned problems, the halogen lamp of the present invention is characterized in that a sealing portion with a metal foil is provided at the end of the light-emitting tube, and an external lead extending to the outside of the light-emitting tube and an internal lead extending to the inside of the light-emitting tube are respectively installed on the metal foil in a manner that enables it to be electrically conductive. One end of the internal lead is connected to the metal foil and the other end is electrically connected to the light-emitting part, and at least a portion of the internal lead has a recrystallized portion obtained by recrystallizing the crystalline structure.

[0014] Additionally, the recrystallized portion of the internal lead is formed outside the bonding portion that bonds with the metal foil.

[0015] In addition, the characteristic is that the diameter of the internal lead is larger than the inner diameter of the filament constituting the light-emitting part.

[0016] In addition, the feature is that the internal lead wire has an enlarged diameter portion formed at the middle position in the axial direction.

[0017] In addition, the feature is that the internal lead is provided with a support member to maintain the position inside the light-emitting tube.

[0018] In addition, the light-emitting part is characterized by being composed of a filament formed by winding multiple wires into a coil shape.

[0019] In addition, in order to solve the above-mentioned problems, the halogen lamp of the present invention is characterized in that the light-emitting part is divided into at least two, and the divided light-emitting parts are connected in an energized manner via a short-circuit conductor rod, the short-circuit conductor rod forming a non-light-emitting part, and at least a portion therein having a recrystallized part obtained by recrystallizing the crystalline structure.

[0020] In addition, the short-circuit conductor rod is inserted and fixed into the filament constituting the light-emitting part through the fixing parts at both ends, and the recrystallization part is formed in the area other than the fixing parts.

[0021] In addition, the characteristic is that the diameter of the short-circuit conductor rod is larger than the inner diameter of the filament.

[0022] In addition, the short-circuit conductor rod is characterized by having an enlarged diameter portion formed at the middle position in the axial direction.

[0023] In addition, the short-circuit conductor rod is provided with a support member to maintain the position inside the light-emitting tube.

[0024] In addition, the light-emitting part is characterized by being composed of a filament formed by winding multiple wires into a coil shape.

[0025] In addition, to solve the above-mentioned problem, in the heating device, a first halogen lamp having a light-emitting part composed of a coil-shaped filament inside the light-emitting tube and a second halogen lamp having a light-emitting part composed of a coil-shaped filament inside the light-emitting tube are formed as a pair. The first halogen lamp is characterized in that the light-emitting part is divided into a first light-emitting part and a second light-emitting part, and a short-circuit conductor rod, which is connected to the first light-emitting part and the second light-emitting part in a way that allows it to be electrically transmitted, is provided between them. The short-circuit conductor rod forms a non-light-emitting part, and at least a portion of its long side has a recrystallized part obtained by recrystallizing the crystalline structure. The second halogen lamp is provided with a third light-emitting part, and the third light-emitting part is positioned corresponding to the non-light-emitting part formed by the short-circuit conductor rod in the first halogen lamp.

[0026] Invention Effects

[0027] According to the present invention, by employing a structure in which at least a portion of the conductive rod electrically connected to the light-emitting part inside the light-emitting tube is recrystallized, the resistance value of the conductive rod (e.g., internal lead or short-circuit conductive rod) can be reduced, and the power loss in the conductive rod (e.g., internal lead or short-circuit conductive rod) can be reduced, thereby supplying sufficient electrical energy to the light-emitting part. Attached Figure Description

[0028] Figure 1 These are cross-sectional views (A) and enlarged views (B) of the halogen lamp of the present invention.

[0029] Figure 2 This is a magnified view of the main part.

[0030] Figure 3 This is a cross-sectional view of another embodiment.

[0031] Figure 4 This is a cross-sectional view of yet another embodiment.

[0032] Figure 5 This is a cross-sectional view of another embodiment of the filament.

[0033] Figure 6 These are cross-sectional views (A) and enlarged views (B) of the halogen lamp involved in this invention.

[0034] Figure 7 These are cross-sectional microstructure diagrams of a short-circuited conductor rod, including diagrams (A) and (B) before recrystallization and diagrams (C) and (D) after recrystallization.

[0035] Figure 8 This is a cross-sectional view of another embodiment.

[0036] Figure 9 This is a cross-sectional view of yet another embodiment.

[0037] Figure 10 This is a cross-sectional view of another embodiment of the filament.

[0038] Figure 11 This is a cross-sectional view of yet another embodiment. Detailed Implementation

[0039] Figure 1 (A) is an overall sectional view of the halogen lamps 1 and 2 of the present invention. Figure 1 (B) is a magnified view of its end.

[0040] In addition, Figure 1 The image shows two halogen lamps 1 and 2 with different shapes. In the first halogen lamp 1, a light-emitting part 12 composed of a coil-shaped tungsten filament is provided inside a tubular glass light-emitting tube 11. Metal foils 14 are clamped and sealed inside the sealing parts 13 at both ends of the light-emitting tube 11. Halogen is sealed inside the sealed light-emitting tube 11.

[0041] Furthermore, one end of the tungsten inner lead 15 and one end of the outer lead 16 are joined and electrically connected to the metal foil 14.

[0042] Furthermore, the other end of the internal lead 15 is connected to the light-emitting part (filament) 12.

[0043] Here, the filament 12 is constructed by winding a metal wire into a coil shape, but from the viewpoint of suppressing resistance, the inner lead 15 is preferably larger in diameter than the wire diameter of the filament 12.

[0044] Figure 1 Example (A) illustrates a structure in which the halogen lamp of the present invention is used in a fixing heating apparatus. In the second halogen lamp 2, the light-emitting portion 22 is divided into a first light-emitting portion 22a and a second light-emitting portion 22b, with a short-circuit conductor rod 28 disposed between them. This short-circuit conductor rod 28 becomes a non-light-emitting portion. Therefore, a structure is obtained in which the light-emitting areas in the first halogen lamp 1 and the second halogen lamp 2 are different.

[0045] By using two types of lamps 1 and 2, the heating area can be varied according to the size of the object being heated (paper medium).

[0046] For example, by lighting only the first halogen lamp 1, its light-emitting part 12 emits light and corresponds to the A4 paper; by lighting the first halogen lamp 1 and the second halogen lamp 2 simultaneously, the light-emitting part 12 of the first halogen lamp 1 and the light-emitting parts 22 (22a, 22b) of the second halogen lamp 2 emit light together and correspond to the A3 paper.

[0047] In the above structure, it is preferable that the diameter of the internal leads 15, 25 is larger than the inner diameter of the filament forming the light-emitting parts 12, 22. This is to minimize the resistance of the internal leads 15, 25, thereby minimizing the power loss and ensuring sufficient electrical energy is supplied to the light-emitting parts 12, 22. The diameter of the internal leads 15, 25 is relatively large without obstructing the sealing at the sealing parts 13, 23.

[0048] Furthermore, the internal leads 15 and 25 are made of tungsten, and their crystalline structure is recrystallized. The recrystallized region can be the entire region along the length, or it can be a part of the length, as described later.

[0049] Figure 1 (B) is an enlarged view of the main part. The recrystallized internal lead 15 is welded to the metal foil 14 at one end in the sealing part 13. In addition, a coil-shaped filament (light-emitting part) 12 is installed at the other end.

[0050] in addition, Figure 1 The short-circuit conductor rod 28, which is inserted between the first light-emitting part 22a and the second light-emitting part 22b, which are two light-emitting parts 22 shown in (A), is also preferably constructed by recrystallization.

[0051] The internal leads 15 and 25, after being recrystallized, have a lower resistance value compared to their state before recrystallization, which can suppress power loss at that location and thus supply sufficient electrical energy to the light-emitting parts 12 and 22.

[0052] exist Figure 1 In the example of the first halogen lamp 1 shown in (A), the area of ​​the light-emitting part 12 is limited relative to the total length of the light-emitting tube 11, while the internal lead 15 is relatively longer. In this case, a support member 17 for holding the position within the light-emitting tube 11 can be provided in the internal lead 15. This reduces the load on the sealing part 13. Furthermore, even if the internal lead 15 itself experiences a decrease in strength due to recrystallization, it can be strengthened in terms of strength by the support member 17.

[0053] On the other hand, Figure 1 In the example of the second halogen lamp 2 shown in (A), a support member 27 is provided on the short-circuit conductor rod 28. As a result, the load on the light-emitting parts 22 (22a, 22b) located on both sides of the short-circuit conductor rod 28 can be reduced, thereby preventing their deformation.

[0054] In addition, in the second halogen lamp 2, a method is shown in which no support is provided in the internal lead 25, but depending on the protruding length in the light-emitting tube 21, a structure in which a support is also installed in the internal lead 25 can also be adopted, similar to the first halogen lamp 1.

[0055] The process of recrystallizing the tungsten internal leads 15, 25 and short-circuit conductor rod 28 as described above is carried out by electrically heating the tungsten rod as raw material in a reducing atmosphere such as hydrogen or a mixture of hydrogen and nitrogen.

[0056] In detail,

[0057] (1) Prepare tungsten raw materials (internal lead components) in a reducing atmosphere.

[0058] (2) Connect the power supply components to the ends of the raw materials respectively.

[0059] (3) Apply a specified high voltage to each of the energized components to heat the raw materials.

[0060] (4) Maintain the electric heating for a certain period of time to heat the raw material to the recrystallization temperature.

[0061] The following is a specific example.

[0062] Spacing between electrically powered components: 300mm

[0063] Voltage applied between energized components: 200V

[0064] Heating time: 15 seconds

[0065] In addition, to recrystallize a portion of the raw material (internal leads), it is sufficient to place energizing components at both ends of the area to be recrystallized and energize the area between them.

[0066] The resulting recrystallization-based crystalline structure is shown in the figure. Figure 2 .

[0067] Figure 2 (A) and (B) are cross-sectional photographs of the raw material before recrystallization (A) and its schematic diagram (B). Figure 2 (C) and (D) are cross-sectional photographs of the recrystallized raw material (C) and its schematic diagram (D). For example... Figure 2 As shown in (A) and (B), the raw material (tungsten rod) before recrystallization has a fibrous structure, as... Figure 2 As shown in (C) and (D), the recrystallized raw material has a coarse structure.

[0068] Here, the coarsened structure after recrystallization mentioned in this invention refers to a state in which, when a verification line perpendicular to the long side is drawn in the cross section of the raw material, the structure is coarsened to the point that the number of grains crossing the verification line is less than 20.

[0069] The resistance of the internal leads after recrystallization was measured. For two samples, A and B, the changes in resistance were observed after recrystallization under the same conditions. The results are shown in Table 1.

[0070]

[0071]

[0072] As shown in Table 1, it was confirmed that in all samples, the resistance value decreased after recrystallization compared to before recrystallization. By using internal leads and short-circuit conductors after such recrystallization, power loss at this location can be suppressed, thereby improving the lamp's lighting characteristics.

[0073] Figure 3 An example using a partially recrystallized internal lead 15 is shown. In this embodiment, the internal lead 15 is composed of a recrystallized portion 15a obtained by recrystallizing a portion of the long side and a non-recrystallized portion 15b, through which the internal lead 15 is bonded to the metal foil 14.

[0074] Normally, if a metal is recrystallized, its mechanical strength is reduced. However, by making a portion of the internal lead 15 a structure that remains in a non-recrystallized state, mechanical strength is maintained in the non-recrystallized portion 15b. Therefore, even when a load is applied when it is bonded to the metal foil 14, the internal lead 15 will not break.

[0075] Figure 4 Another embodiment is shown in which an enlarged diameter portion 15c is formed in the internal lead 15 of the first halogen lamp 1. The enlarged diameter portion 15c is formed at the middle position in the axial direction outside the connection portion that connects to the metal foil 14 and the light-emitting portion 12, thereby reducing the resistance value of the internal lead 15.

[0076] Furthermore, the short-circuit conductor rod 28 in the second halogen lamp 2 may also have an enlarged diameter portion 28c formed at the middle position in the axial direction.

[0077] exist Figure 5 In other embodiments shown, the filament that forms the light-emitting part 12 is wound into a coil shape and is composed of multiple wires 12x and 12y.

[0078] The heat generated in the light-emitting part 12 is transferred to the internal lead 15 through its connection. However, if the amount of heat transferred is large, the internal lead 15 will be heated, which may cause its recrystallization state to change further. The optimal recrystallization of the internal lead 15 is determined by balancing the reduction of resistance and the reduction of mechanical strength, but unwanted recrystallization will disrupt its balance.

[0079] Therefore, in order to avoid unnecessary heating in the light-emitting part 12, as in this embodiment, the light-emitting part 12 is composed of multiple (two) filaments 12x and 12y. Under the same light irradiation, the total heat capacity of the two filaments decreases relative to the heat capacity of a single filament, which can reduce the heat capacity of the light-emitting part 12, and thus reduce the heat transfer to the internal lead 15.

[0080] This prevents the internal lead 15 from being heated and undesirably promoting recrystallization.

[0081] As explained above, in the halogen lamp of the present invention, at least a portion of the metal foil in the sealing part and the internal lead of the light-emitting part has a recrystallized part obtained by recrystallizing the crystalline structure, thereby achieving the following effects: the resistance value in the internal lead can be reduced, and the power loss at that part can be reduced to supply sufficient electrical energy to the light-emitting part, and the start-up time of the light-emitting part (filament) after the lamp is lit is faster.

[0082] Furthermore, by employing a structure that prevents recrystallization of the portion corresponding to the joint that is bonded to the metal foil, it is possible to prevent the internal leads from being damaged by the load when the internal leads are bonded to the metal foil.

[0083] As described above, according to the first embodiment of the present invention, a halogen lamp can be provided that has a light-emitting portion composed of a coil-shaped filament inside the light-emitting tube. This reduces heat loss in the internal leads that electrically connect the metal foil of the sealing portion to the light-emitting portion, accelerates the start-up of the light-emitting portion, and increases the thermal energy in the light-emitting portion. Specifically, by employing a structure in which at least a portion of the internal leads connecting the light-emitting portion inside the light-emitting tube and the metal foil inside the sealing portion is recrystallized, the resistance value of the internal leads can be reduced, and power loss in the internal leads can be decreased, thereby supplying sufficient electrical energy to the light-emitting portion. Furthermore, by making the diameter of the internal leads larger than the inner diameter of the filament constituting the light-emitting portion, its resistance value can be further reduced. In addition, by forming an enlarged diameter portion at the middle position of the internal leads, its resistance value can be further reduced.

[0084] Figure 6 This is a structural example of using the halogen lamp of the present invention in a fixing heating device. Figure 6 (A) is an overall cross-sectional view of the halogen lamps A1 and A2 that form a pair. Figure 6(B) is a magnified view of its main part.

[0085] Figure 6 (A) shows two halogen lamps A1 and A2 with different shapes. In the first halogen lamp A1, a light-emitting part A12 composed of a coiled tungsten filament is provided inside a tubular glass light-emitting tube A11. A metal foil A14 is clamped and sealed in sealing parts A13 at both ends of the light-emitting tube A11, and halogen is sealed inside the sealed light-emitting tube A11. The metal foil A14 in the sealing part A13 is joined and electrically connected to one end of an internal tungsten lead A15 and one end of an external lead A16. Furthermore, the other end of the internal lead A15 is connected to the light-emitting part (filament) A12.

[0086] Here, in the first halogen lamp A1, the light-emitting part (filament) A12, composed of a filament, is divided into a first light-emitting part (filament) A12a and a second light-emitting part A12b. Furthermore, a tungsten short-circuit conductor rod A17 is provided between these first light-emitting parts A12a and second light-emitting parts A12b, connecting the two light-emitting parts A12a and A12b in a manner capable of conducting electricity. This short-circuit conductor rod A17 is a non-light-emitting part. Figure 6 As shown in (B), the two ends of the short-circuit conductor rod A17 are respectively inserted into the first filament A12a and the second filament A12b, and fixed by riveting or welding.

[0087] In the above structure, it is preferable that the diameter of the short-circuit conductor rod A17 is larger than the diameter of the filament forming the light-emitting part A12. This is to minimize the resistance of the short-circuit conductor rod A17, thereby minimizing the power loss and ensuring sufficient electrical energy is supplied to the light-emitting part A12.

[0088] Furthermore, due to its association with the light-emitting area, the aforementioned short-circuit conductor rod A17 is sometimes formed to be relatively long. In this case, such as Figure 6 As shown in (A), a support member A18 can also be provided on the short-circuit conductor rod A17 to hold it in place within the light-emitting tube A11. This reduces the load on the mounting portion of the short-circuit conductor rod A17 and the light-emitting part A12, and prevents deformation of the light-emitting part A12. Furthermore, the number of support members A18 can be appropriately selected based on their relationship to the length of the short-circuit conductor rod A17.

[0089] Thus, the first halogen lamp A1 forms a lamp with two luminous areas and a non-luminous area in between.

[0090] On the other hand, the second halogen lamp A2 is shown to have a single light-emitting portion A22, which corresponds in the longitudinal direction to the position of the non-light-emitting portion of the first halogen lamp A1, which is composed of a short-circuit conductor rod A17. Therefore, a structure is obtained in which the light-emitting areas of the first halogen lamp A1 and the second halogen lamp A2 are different.

[0091] By using two types of lamps, A1 and A2, the heating area can be varied according to the size of the object being heated (paper medium).

[0092] For example, by lighting only the second halogen lamp A2, its light-emitting part A22 emits light and corresponds to the A4 paper. By lighting both the first halogen lamp A1 and the second halogen lamp A2 at the same time, the light-emitting parts A12 (A12a, A12b) of the first halogen lamp A1 and the light-emitting part A22 of the second halogen lamp A2 emit light together and correspond to the A3 paper.

[0093] Furthermore, the crystalline structure of the tungsten short-circuit conductor rod A17 in the first halogen lamp A1 is recrystallized. The recrystallized region can be the entire region along the length direction, or it can be a part of the length direction as described later.

[0094] Compared with the state before recrystallization, the short-circuit conductor rod A17 after recrystallization has a smaller resistance value, which can suppress the power loss in the short-circuit conductor rod A17, thereby supplying sufficient electrical energy to the light-emitting part A12.

[0095] The process of recrystallizing the crystalline structure of the tungsten short-circuit conductor rod A17 as described above is carried out by electrically heating the tungsten rod as raw material in a reducing atmosphere such as nitrogen.

[0096] In detail,

[0097] (1) Prepare tungsten raw materials (short-circuit conductor rod raw materials) in a reducing atmosphere.

[0098] (2) Connect the power-carrying core wires to the ends of the raw materials respectively.

[0099] (3) Apply a specified high voltage to each energized core wire to heat the raw material.

[0100] (4) Maintain the electric heating for a certain period of time to heat the raw material to the recrystallization temperature.

[0101] The following is a specific example.

[0102] Spacing between conductors for power supply: 300mm

[0103] Voltage applied between the conductors for power supply: 200V

[0104] Heating time: 15 seconds

[0105] In addition, to recrystallize a portion of the raw material (short-circuit conductor rod), it is only necessary to place a energized core wire at both ends of the region to be recrystallized and energize the area between them.

[0106] The resulting recrystallization-based crystalline structure is shown in the figure. Figure 7 .in addition, Figure 7 The content shown is related to Figure 2 The content shown is the same as the content shown.

[0107] Figure 7 (A) and (B) are cross-sectional photographs of the raw material before recrystallization (A) and its schematic diagram (B). Figure 7 (C) and (D) are cross-sectional photographs of the recrystallized raw material (C) and its schematic diagram (D). For example... Figure 7 As shown in (A) and (B), the raw material (tungsten rod) before recrystallization has a fibrous structure, as... Figure 7 As shown in (C) and (D), the recrystallized raw material has a coarse structure.

[0108] Here, the coarsened structure after recrystallization mentioned in this invention refers to a state in which, when a verification line perpendicular to the long side is drawn in the cross section of the raw material, the structure is coarsened to the point that the number of grains crossing the verification line is less than 20.

[0109] The resistance of the short-circuited conductor rod after recrystallization was measured. For two samples, A and B, the changes in resistance were observed after undergoing the same recrystallization treatment. The results are shown in Table 2.

[0110]

[0111]

[0112] Table 2 shows that in all samples, the resistance value decreased after recrystallization compared to before recrystallization. By using a short-circuit conductor rod that has undergone such recrystallization, power loss at this location can be suppressed, thereby improving the lamp's lighting characteristics.

[0113] Figure 8 An example is shown using a short-circuit conductor rod A17 that has undergone partial recrystallization along its long side. In this embodiment, the short-circuit conductor rod A17 is composed of a recrystallized portion A17a, obtained by recrystallizing a portion along its long side, i.e., the middle portion, and non-recrystallized portions A17b, which are not recrystallized at both ends. Furthermore, although in Figure 8 Not shown in the figure, but the other end of the short-circuit conductor rod A17 also becomes the non-recrystallized part that has not been recrystallized.

[0114] Furthermore, the non-recrystallized portions A17b at both ends are inserted and fixed into the light-emitting portion (filament) 12. At this time, the outer diameter D2 of the short-circuit conductor rod A17 is slightly larger than the inner diameter D1 of the filament A12. The short-circuit conductor rod A17 is inserted into the filament A12 in the form of expanding the inner diameter of the filament A12, so the fixation of the two becomes firm, and fixing operations such as riveting or welding become easy.

[0115] Normally, if a metal is recrystallized, its mechanical strength decreases. However, by making a portion of the short-circuit conductor rod A17, namely the fixed portions at both ends, into a structure that maintains a non-recrystallized state, mechanical strength is maintained in the non-recrystallized portion A17b. Therefore, even when a load is applied while it is fixed to the light-emitting portion A12, the short-circuit conductor rod A17 will not break.

[0116] However, based on the same principle, at least a portion of the internal lead A15 of the first halogen lamp A1 can also be made into a recrystallized structure. Here, it is also possible to adopt a structure in which the joint portion of the internal lead A15 that is joined to the metal foil A14 and the fixing portion that is fixed to the filament A12 remain in a non-recrystallized state, while other areas become recrystallized. This allows for a structure that maintains mechanical strength at the joint portion joined to the metal foil A14 and the fixing portion that is fixed to the filament A12, while reducing the overall electrical resistance.

[0117] Figure 9 Another embodiment is shown in which an enlarged diameter portion A17c is formed on the short-circuit conductor rod A17 of the first halogen lamp A1. This enlarged diameter portion A17c is formed at a mid-axial position outside the fixing portions that are fixed to the filaments A12 at both ends, thereby reducing the overall resistance value of the short-circuit conductor rod A17. In this case, at least the enlarged diameter portion A17c becomes a recrystallized structure.

[0118] In addition, the internal lead A15 in the first halogen lamp A1 can also be enlarged at the middle position according to the amount of protrusion in the light-emitting tube A11.

[0119] Additionally, a case is shown where an enlarged diameter portion A25c is formed at the middle position of the axial direction of the internal lead A25 of the second halogen lamp A2.

[0120] exist Figure 10 In other embodiments shown, the filament that forms the light-emitting portion A12, wound into a coil shape, is composed of multiple wires A12x and A12y.

[0121] The heat generated in the light-emitting part A12 is transferred to the short-circuit conductor rod A17 via its fixing part. However, if the amount of heat transferred is large, the short-circuit conductor rod A17 will be heated, which may cause its recrystallization state to change further. The optimal recrystallization of the short-circuit conductor rod A17 is determined by balancing the reduction of resistance and the decrease of mechanical strength, but unwanted recrystallization will disrupt its balance.

[0122] Therefore, in order to avoid excessive overheating in the light-emitting part (heat-generating part) A12, as in this embodiment, the light-emitting part A12 is composed of multiple (two) filaments A12x and A12y. Under the same light irradiation, the total heat capacity of the two filaments decreases relative to the heat capacity of a single filament, which can reduce the heat capacity of the light-emitting part 12, and thus reduce the heat transfer to the short-circuit conductor rod A17.

[0123] This prevents the short-circuit conductor rod A17 from overheating and undesirably promoting recrystallization.

[0124] However, in Figure 6 In the embodiments, it is assumed that the heating area can be varied according to the size of the object being heated (paper medium) by using two lamps A1 and A2, and the case of setting a short-circuit conductor rod A17 in one lamp A1 is described, but lamps with this configuration can also be used alone.

[0125] Figure 11 An embodiment using a lamp alone is shown. Such a lamp, for example, can be used in fixing units of postcard size with a relatively short heating area.

[0126] Because the heating area of ​​lamp A1 is short, the temperature in the central part tends to be high, leading to uneven temperature distribution throughout the lamp. To avoid this, the light-emitting part A12 (A12a, A12b) is divided, and a short-circuit conductor rod A17 is placed in the center of the light-emitting part to form a non-light-emitting part. By increasing the heat at both ends of the light-emitting part A12, the temperature of the entire heating area is made more uniform. In this way, by forming a recrystallized part (a recrystallized section) in at least a portion of the long side of the short-circuit conductor rod A17, the power loss caused by the short-circuit conductor rod can be further reduced, thereby supplying sufficient electrical energy to the light-emitting part.

[0127] In addition, not limited to the above-mentioned postcard-sized fixing examples, from the viewpoint of improving temperature uniformity, a short-circuit conductive rod is sometimes placed in the middle of the light-emitting part, depending on the separation distance between the lamp and the object being heated.

[0128] As explained above, in the halogen lamp of the present invention, the light-emitting part is divided into at least two parts, and the divided light-emitting parts are connected in a manner that allows them to be energized via a short-circuit conductor rod. At least a portion of the long side of the short-circuit conductor rod has a recrystallized portion obtained by recrystallizing the crystalline structure, thereby achieving the following effects: the resistance value in the short-circuit conductor rod can be reduced, and the power loss at that part can be reduced to supply sufficient electrical energy to the light-emitting part, and the start-up time of the light-emitting part (filament) after the lamp is lit is faster.

[0129] Furthermore, by employing a structure that prevents recrystallization of the portion corresponding to the fixing portion of the short-circuit conductor rod and the light-emitting part, it is possible to prevent the short-circuit conductor rod from being damaged by the load when it is fixed to the filament.

[0130] Label Explanation

[0131] 1: (First) Halogen lamp

[0132] 11: LED

[0133] 12: Light-emitting part (filament)

[0134] 13: Sealing part

[0135] 14: Metal foil

[0136] 15: Internal leads

[0137] 15a: Recrystallization section

[0138] 15b: Non-recrystallization section

[0139] 15c: Expanded diameter section

[0140] 16: External lead

[0141] 17: Support components

[0142] 2: (Second) Halogen lamp

[0143] 21: LED

[0144] 22: Light-emitting part (filament)

[0145] 23: Sealing part

[0146] 24: Metal foil

[0147] 25: Internal leads

[0148] 26: External lead

[0149] 27: Support components

[0150] 28: Short-circuit conductor rod

[0151] 28c: Expanded diameter section

[0152] A1: (First) Halogen lamp

[0153] A11: LED

[0154] A12: Light-emitting part (filament)

[0155] A12a: First light-emitting part

[0156] A12b: Second light-emitting part

[0157] A13: Sealing section

[0158] A14: Metal foil

[0159] A15: Internal Leads

[0160] A16: External Leads

[0161] A17: Short-circuit conductor rod

[0162] A17a: Recrystallization section

[0163] A17b: Non-recrystallization section

[0164] A17c: Expanded diameter section

[0165] A18: Support component

[0166] A2: (Second) Halogen lamp

[0167] A21: LED

[0168] A22: Light-emitting part (filament)

[0169] A23: Sealing part

[0170] A24: Metal foil

[0171] A25: Internal leads

[0172] A25c: Expanded Diameter Section

[0173] A26: External Leads

[0174] A28: Support component

Claims

1. A halogen lamp, comprising a light-emitting portion inside a light-emitting tube consisting of a coil-shaped filament, characterized in that, The end of the light-emitting tube is provided with a sealing part sealed with a metal foil. A tungsten conductive rod is installed in the light-emitting part in a manner that allows it to be electrically energized, extending into the interior of the light-emitting tube. At least a portion of the conductive rod has a recrystallized portion obtained by recrystallizing the crystalline structure. The metal foil is respectively equipped with external leads extending to the outside of the light-emitting tube as conductive rods and internal leads extending to the inside of the light-emitting tube as conductive rods, which are capable of being electrically conductive. One end of the internal lead is connected to the metal foil, and the other end is electrically connected to the light-emitting part. The diameter of the internal lead is larger than the inner diameter of the filament constituting the light-emitting part. At least a portion of the internal leads has a recrystallized portion resulting from the recrystallization of the crystalline structure.

2. The halogen lamp according to claim 1, characterized in that, The recrystallized portion of the internal lead is formed outside the bonding portion that is bonded to the metal foil.

3. The halogen lamp according to claim 1, characterized in that, The internal lead has an enlarged diameter section at the middle position in the axial direction.

4. The halogen lamp according to claim 1, characterized in that, The internal lead is provided with a support to maintain the position of the light-emitting tube.

5. The halogen lamp according to any one of claims 1 to 4, characterized in that, The light-emitting part is composed of a filament made by winding multiple wires into a coil shape.

6. The halogen lamp according to claim 1, characterized in that, The light-emitting part is divided into at least two parts, and the divided light-emitting parts are connected in a manner that allows electricity to pass through them via a short-circuit conductor rod that serves as the conductive rod. The short-circuit conductor rod forms a non-light-emitting portion, and at least a portion of the short-circuit conductor rod in the long side direction has a recrystallized portion obtained by recrystallizing the crystalline structure.

7. The halogen lamp according to claim 6, characterized in that, The short-circuit conductor rod is inserted and fixed into the filament constituting the light-emitting part through the fixing parts at both ends of the short-circuit conductor rod, and the recrystallization part is formed in the area other than the fixing parts.

8. The halogen lamp according to claim 7, characterized in that, The diameter of the short-circuit conductor rod is larger than the inner diameter of the filament.

9. The halogen lamp according to claim 7, characterized in that, The short-circuit conductor rod has an enlarged diameter section at the middle position in the axial direction.

10. The halogen lamp according to claim 7, characterized in that, The short-circuit conductor rod is provided with a support to maintain the position of the light-emitting tube.

11. The halogen lamp according to any one of claims 6 to 10, characterized in that, The light-emitting part is composed of a filament made by winding multiple wires into a coil shape.

12. A heating device, wherein a first halogen lamp having a light-emitting portion composed of a coil-shaped filament inside a light-emitting tube and a second halogen lamp having a light-emitting portion composed of a coil-shaped filament inside a light-emitting tube form a pair, characterized in that, The light-emitting tubes of the first halogen lamp and the light-emitting tubes of the second halogen lamp are provided with sealing portions sealed with metal foil. In the first halogen lamp, the light-emitting part is divided into a first light-emitting part and a second light-emitting part. A short-circuit conductor rod made of tungsten, which is connected to the first light-emitting part and the second light-emitting part in a manner that allows for electrical conduction, is provided between them. The short-circuit conductor rod forms a non-light-emitting portion, and at least a portion of the short-circuit conductor rod in the long side direction has a recrystallized portion obtained by recrystallization of the crystalline structure. The second halogen lamp is provided with a third light-emitting part, which is positioned corresponding to the non-light-emitting part of the first halogen lamp formed by the short-circuit conductive rod. The metal foil is respectively equipped with external leads extending to the outside of the light-emitting tube as conductive rods and internal leads extending to the inside of the light-emitting tube as conductive rods, which are capable of being electrically conductive. One end of the internal lead is connected to the metal foil, and the other end is electrically connected to the light-emitting part. The diameter of the internal lead is larger than the inner diameter of the filament constituting the light-emitting part. At least a portion of the internal leads has a recrystallized portion resulting from the recrystallization of the crystalline structure.

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