JP2013196928A - Filament lamp and heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filament lamp which can be suppressed from cracking, and a heating device.SOLUTION: A filament lamp includes a glass pipe 1 having a cylindrical portion 11 and a sealing portion 12 formed at both ends thereof, a metal foil 2 sealed to the sealing portion 12, a filament 3 electrically connected to the metal foil 2 to be arranged inside the cylindrical portion 11, and a base 6 provided to house the sealing portion 12 inside. The sealing portion 12 is a pinch seal portion comprising a pair of first surfaces 121 and a pair of second surfaces 122, and the base 6 has a pair of first wall portions 61 and a pair of second wall portions 62, and also has a thin portion 621 formed on the lamp center side of the second wall portion 62, the size d2 of a gap between a lamp center side end of the thin portion 621 and the sealing portion 12 being larger than the size of a gap d1 between the second wall portion 62 where the thin portion 621 is formed and a lamp end side end of the sealing portion 12.

Description

  Embodiments of the present invention relate to a filament lamp and a heating device used for manufacturing a solar cell, molding a plastic bottle, heating, toner fixing of a copying machine or a printer.

  The filament lamp has a structure in which a filament is arranged inside a cylindrical glass tube. Sealing portions formed by pinch seals are formed at both ends of the cylindrical glass tube, and a base is provided at the sealing portions. An electric wire is arranged inside the base, and the electric wire is connected to an outer lead wire led out from the sealing portion.

  The filament lamp may be sandwiched by a sandwiching member having a base portion including a pair of elastic pieces when the heating device is attached. When such attachment is performed, the filament lamp is cracked.

Japanese Patent No. 3444149 Japanese Patent No. 2755432

  The problem to be solved by the present invention is to provide a filament lamp and a heating device capable of suppressing cracking.

    In order to achieve the above object, a filament lamp according to an embodiment includes a glass tube having a cylindrical portion and sealing portions formed at both ends thereof, a metal foil sealed to the sealing portion, A filament electrically connected to the metal foil so as to be disposed inside the cylindrical portion; and a base provided so as to accommodate the sealing portion therein. The portion is a pinch seal portion configured by a pair of first surfaces opposed to the metal foil and a pair of second surfaces connected to the pair of first surfaces along the tube axis direction. The base includes a pair of first wall portions facing the pair of first surfaces, and a pair of second wall portions facing the pair of second surfaces, A thin wall portion is formed on the lamp central side of the first wall portion and / or the second wall portion, and the thin wall portion of the thin wall portion is formed. The gap between the central end of the lamp and the sealing portion is such that the first wall portion and / or the second wall portion where the thin portion is formed and the lamp end side end of the sealing portion. It is larger than the size of the gap between the parts.

It is a figure for demonstrating the filament lamp of 1st Embodiment. It is a figure for demonstrating one cross-sectional shape of a base in the filament lamp of 1st Embodiment. It is a figure for demonstrating the other cross-sectional shape of a base in the filament lamp of 1st Embodiment. It is a figure for demonstrating the modification of the filament lamp of 1st Embodiment. It is a figure for demonstrating the other modification of the filament lamp of 1st Embodiment. It is a figure for demonstrating the filament lamp of 2nd Embodiment. It is a figure for demonstrating the base of 2nd Embodiment. It is a figure for demonstrating the fixed relationship of L4 / L1 and a lamp crack and a lamp | ramp and a base. It is a figure for demonstrating the modification of the filament lamp of 2nd Embodiment. It is a figure for demonstrating the heating apparatus using the filament lamp of 3rd Embodiment. It is a figure for demonstrating the modification of a filament lamp.

  Hereinafter, embodiments for carrying out the invention will be described.

(First embodiment)
The filament lamp of the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram for explaining the filament lamp of the first embodiment, FIG. 2 is a diagram for explaining one cross-sectional shape of the base in the filament lamp of the first embodiment, and FIG. It is a figure for demonstrating the other cross-sectional shape of a base in the filament lamp of 1st Embodiment.

  The filament lamp includes a glass tube 1 made of, for example, quartz glass as a main part. The glass tube 1 is an elongated tube having a total length of, for example, 1900 mm, and includes a cylindrical portion 11 and a sealing portion 12. The cylindrical portion 11 is a cylindrical portion having an outer diameter of about 12 mm. A chip 111 is formed in a part thereof, for example, a substantially intermediate portion in the tube axis direction. The tip 111 is a mark used for exhaust / gas introduction in the glass tube 1 and was originally a cylindrical glass tube, but the opening was sealed after the exhaust / gas introduction, like a projection. It remains in

  The sealing portion 12 is a pinch seal portion formed by a pinch seal process using a pincher or the like, and is formed at both ends of the tubular portion 11. The sealing unit 12 includes a first surface 121, a second surface 122, and an end surface 123. The 1st surface 121 is a wide surface, and is comprised by a pair which opposes. The second surface 122 is a narrow surface connected to the pair of first surfaces 121 and is configured as a pair facing each other. The end surface 123 is a surface connected to the pair of first surfaces 121 and the pair of second surfaces 122, and is located on the lamp end side of the sealing portion 12. The dimensions of the sealing portion 12 are, for example, a length L1 along the tube axis of 15 mm, a width of 12 mm, and a thickness of 1.5 mm.

  A space 13 is formed inside the glass tube 1. The space 13 is filled with, for example, a trace amount of a halogen substance such as bromine or iodine, or a gas such as argon, neon, or nitrogen.

  The metal foil 2 is sealed inside the sealing portion 12. The metal foil 2 is a thin plate made of, for example, molybdenum, and is disposed so as to face the first surface 121 of the sealing portion 12.

  A filament 3 is provided inside the glass tube 1. The filament 3 is a metal wire made of, for example, tungsten. The filament 3 is composed of a heat generating portion that generates heat during lighting and a leg portion that supplies power to the heat generating portion. The heat generating portion is spirally wound, and one end of the leg portion is connected to both ends of the heat generating portion, and the other end is overlapped and connected on the surface of the metal foil 2.

  An anchor 4 is provided inside the glass tube 1. The anchor 4 is a metal wire made of tungsten, for example, and functions as a support member for disposing the filament 3 substantially at the center of the space 13. Specifically, one end side is connected to the filament 3 and the other end side is disposed in contact with the inner wall surface of the glass tube 1. A plurality of such anchors 4 are provided along the tube axis direction.

  The outer lead wire 5 is connected to the side where the leg portion of the metal foil 2 is not connected. The outer lead wire 5 is a metal wire made of, for example, molybdenum or tungsten, and the other end is led out from the sealing portion 12 so as to be along the tube axis.

  The sealing part 12 is provided with a base 6. The base 6 is an envelope made of ceramic, for example, and has dimensions of, for example, a length along the tube axis of 21 mm, a width of 9 mm, a height of 15 mm, and a thickness of 1.5 mm. The base 6 includes a first wall portion 61, a second wall portion 62, and an end wall portion 63. The first wall portion 61 is a wall facing the first surface 121, and is composed of a pair facing each other. The second wall portion 62 is a wall facing the second surface 122 and is configured as a pair facing each other. The end wall portion 63 is a wall facing the end surface 123. The sealing portion 12 is accommodated in the internal space of the base 6 constituted by these walls through an opening formed on the opposite side of the end face 123, for example, about L2 = 12 mm.

  The base 6 further includes a locking wall 64, an introduction hole 65, and a welding hole 66 inside. The locking wall 64 is a wall for preventing the insertion of the sealing portion 12, and is provided on each second wall portion 62 so as to be bridged with the first wall portion 61. The introduction hole 65 is a circular hole provided in one second wall portion 62. The welding hole 66 is a circular hole provided in each first wall portion 61.

  An electric wire 7 is provided inside the base 6. The electric wire 7 includes a metal wire 71 and a covering portion 72 made of an insulating material that covers the metal wire 71. The electric wire 7 is inserted into the base 6 through the introduction hole 65, and the metal wire 71 is welded to the outer lead wire 5. The metal wire 71 and the outer lead wire 5 are welded using the welding hole 66.

  Here, in the present embodiment, a thin portion 621 is formed on the lamp central side of the second wall portion 62 of the base 6. The thin portion 621 is formed by a slope that gradually and gradually decreases the thickness of the second wall portion 62 from the vicinity of the locking wall 64 toward the center of the lamp. Therefore, when the base 6 is attached to the sealing portion 12, the thin portion 621 is larger than the size d1 of the gap between the second wall portion 62 where the thin portion 621 is formed and the lamp end side end portion of the sealing portion 12. The size d2 of the gap between the lamp center side end portion and the second surface 122 of the sealing portion 12 becomes larger.

  The filament lamp of the present embodiment as described above (Example), the filament lamp in which the thin portion is not formed (Comparative Example 1), and the filament in which adhesive is filled between the sealing portion and the base in Comparative Example 1 With respect to the lamp (Comparative Example 2), a test was performed in which a base portion was attached to a holding member composed of a pair of elastic pieces as shown in FIG.

  As a result, almost no defects such as cracks occurred in the examples, but in Comparative Example 1, cracks occurred at the sealing portion covered by the base or at the boundary between the cylindrical portion and the sealing portion at the time of attachment. Or the lamp was damaged near the tip. This is considered to be related to the fact that the pair of sealing portions are not necessarily formed in the same direction on the same plane but may be twisted. In other words, it is considered that when the base is pinched by the pinching member, stress is applied to the sealing portion due to the twist, and cracking occurs in the sealing portion or the chip. Moreover, in the comparative example 1, the same malfunction occurred during lighting. This is considered to be related to the fact that the filament lamp becomes high temperature during lighting, so that each member extends or deforms due to thermal expansion. That is, it is considered that due to the thermal expansion, the base contacts the sealing portion and stress is applied, and the sealing portion and the chip are cracked. Further, in Comparative Example 2, a defect of cracking occurred more than in Comparative Example 1. This is considered that when the sealing portion and the base are fixed with an adhesive, the stress as described above cannot be released at all, so that it is more likely to break.

  On the other hand, in the embodiment, the thin wall portion 621 is formed on the inner side of the second wall portion 62 on the lamp center side, and the gap d2 between the lamp center side end portion of the thin wall portion 621 and the sealing portion 12 is set. Since the gap d1 is larger than the gap d1 between the second wall 62 where the thin portion 621 is formed and the lamp end side end of the sealing portion 12, the gap due to the formation of the thin portion 621 is described above. It is considered that the cracking of the sealing part and the chip could be suppressed.

  In addition, as shown in FIG. 4, the thin part 611 is formed in the lamp | ramp center side inside the 1st wall part 61, and the lamp | ramp of the 1st wall part 61 and the sealing part 12 in which the thin part 611 is formed is formed. The gap size d4 between the lamp center side end portion of the thin portion 611 and the first surface 121 of the sealing portion 12 may be made larger than the gap size d3 of the end side end portion. The same effect as the embodiment can be obtained. When the thin wall portion 611 is formed on both the first wall portion 61 and the second wall portion 62, an effect higher than that of the embodiment can be obtained.

  The thin portions 611 and 621 may be formed by slopes that gradually reduce the thickness of the first wall portion 61 and the second wall portion 62 from the vicinity of the locking wall 64 toward the center of the lamp. The same effects as in the embodiment can be obtained. Even if the thin wall portions 611 and 621 are recessed in such a manner that the thickness of the wall gradually decreases in the lamp central side of the first wall portion 61 or the second wall portion 62, the same effect as the embodiment can be obtained. Can be obtained.

  In the first embodiment, the thin wall portion 621 is formed inside the lamp center side of the second wall portion 62, and the size d2 of the gap between the lamp center side end portion of the thin wall portion 621 and the sealing portion 12 is set as follows. Since the size d1 of the gap between the second wall portion 62 where the thin portion 621 is formed and the lamp end side end portion of the sealing portion 12 is made larger, cracking of the sealing portion and the chip can be suppressed. it can.

(Second Embodiment)
FIG. 6 is a diagram for explaining the filament lamp of the second embodiment. About each part of this 2nd Embodiment, the same part as each part of the filament lamp of 1st Embodiment is shown with the same code | symbol, and the description is abbreviate | omitted.

  In this embodiment, a notch 622 is formed on the lamp center side of the second wall portion 621. That is, the base 6 has a shape as shown in FIG. Further, due to the notch 622, the length L1 along the tube axis direction of the sealing part 12 and the length from the lamp end side end of the notch 622 to the lamp end side of the sealing part 12 accommodated in the base 6 are provided. The relationship L4 / L1 with L4 is set to 0.3 to 0.6.

  FIG. 8 is a diagram for explaining the relationship between L4 / L1 and lamp cracking and the fixing between the lamp and the base.

  From FIG. 8, it can be seen that when L4 / L1 is small, lamp cracking tends to be suppressed, and it is preferably 0.6 or less, and more preferably 0.5 or less. This is considered to be because stress can be absorbed by the notch 622 as in the first embodiment. On the other hand, when L4 / L1 increases, the lamp and the base tend to be fixed well, and it is understood that 0.3 or more, further 0.4 or more is desirable. This is because the wall covering the base becomes wider. Therefore, L4 / L1 is preferably 0.3 to 0.6, more preferably 0.3 to 0.5, and most preferably 0.4 to 0.5.

  As shown in FIG. 9, a notch 612 is formed on the lamp central side of the first wall 611, the length L1 along the tube axis direction of the sealing part 12, and the lamp end side of the notch 612. Even if the relationship L4 / L1 with the length L4 from the end portion to the lamp end side of the sealing portion 12 accommodated in the base 6 is set to 0.3 to 0.6, the same effect as in the second embodiment can be obtained. Can do.

  In the first embodiment, a notch portion 622 is formed on the lamp center side of the second wall portion 621, the length L1 along the tube axis direction of the sealing portion 12, and the lamp end side end of the notch portion 622. Since the relationship L4 / L1 with the length L4 from the portion to the lamp end side of the sealing portion 12 accommodated in the base 6 is set to 0.3 to 0.6, cracking of the sealing portion and the chip is suppressed. be able to.

(Third embodiment)
FIG. 10 is a diagram for explaining the heating device according to the third embodiment.

  The heating device includes a sandwiching member 8 and a filament lamp 10.

  The sandwiching member 8 is a fixing member made of a metal such as stainless steel, and includes a pair of elastic pieces 81 and 82.

  The filament lamp 10 is the lamp described in the first embodiment or the second embodiment, and the first surface 61 of the base 6 is held between elastic pieces 81 and 82. In the present embodiment, there are three filament lamps 10 arranged in parallel at a predetermined interval.

  This heating device is used, for example, for molding a plastic bottle. Therefore, the lamp becomes hot during lighting. When the temperature becomes high during lighting, the member expands or deforms due to thermal expansion. However, since the lamp has a structure capable of absorbing the stress that can be generated by the lamp, problems such as cracking can be suppressed.

  The present invention is not limited to the above embodiments, and various modifications are possible.

  The base 6 may be configured such that L2 / L1 satisfies 0.3 to 0.6 for both the first wall portion 61 and the second wall portion 62. That is, although not provided with a notch, the above relational expression may be satisfied by shortening L2 of the base 6, for example, L2 = about 10 mm.

  Moreover, the base 6 may be provided with an elastic structure inside as shown in FIG. Specifically, a structure may be adopted in which a metal leaf spring 68 is disposed in the space 67 of the first wall portion 61 and the second wall portion 62 and a ceramic partition plate 69 is disposed inside the leaf spring 68. . The base 6 can absorb stress applied to the sealing portion 12 while firmly holding the sealing portion 12.

  Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Glass tube 11 Cylindrical part 12 Sealing part 121 1st surface 122 2nd surface 2 Metal foil 3 Filament 6 Base 61 1st wall part 62 2nd wall part 621 Thin part

Claims (3)

A glass tube having a cylindrical part, sealing parts formed at both ends thereof, a metal foil sealed to the sealing part, and the metal so as to be disposed inside the cylindrical part A filament electrically connected to the foil, and a base provided to accommodate the sealing portion therein,
The sealing portion includes a pair of first surfaces opposed to the metal foil and a pair of second surfaces connected to the pair of first surfaces along the tube axis direction. Seal part,
The base includes a pair of first wall portions facing the pair of first surfaces, and a pair of second wall portions facing the pair of second surfaces,
A thin wall portion is formed on the lamp center side of the first wall portion and / or the second wall portion, and the size of the gap between the lamp center side end portion of the thin wall portion and the sealing portion is: A filament lamp that is larger than a gap between the first wall part and / or the second wall part in which the thin part is formed and a lamp end side end part of the sealing part. A glass tube having a cylindrical part, sealing parts formed at both ends thereof, a metal foil sealed to the sealing part, and the metal so as to be disposed inside the cylindrical part A filament electrically connected to the foil, and a base provided to accommodate the sealing portion therein,
The sealing portion includes a pair of first surfaces opposed to the metal foil and a pair of second surfaces connected to the pair of first surfaces along the tube axis direction. Seal part,
The base includes a pair of first wall portions facing the pair of first surfaces, and a pair of second wall portions facing the pair of second surfaces,
A notch portion is formed on the lamp center side of the first wall portion or the second wall portion, the length along the tube axis direction of the sealing portion is L1, and the lamp end side of the notch portion A filament lamp in which L4 / L1 satisfies 0.3 to 0.6, where L4 is a length from the end portion to the lamp end side of the sealing portion accommodated in the base. A sandwiching member comprising a pair of elastic pieces;
The filament lamp according to claim 1 or 2, wherein an outer wall surface of the pair of first wall portions is held between the holding members.
A heating apparatus comprising:

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