JP2006302559A - Tube type incandescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube type incandescent lamp capable of reducing or preventing possibility of generating force to pull out a sealed part or a base, and an external lead, which is caused by rotational torque generated when locking a metal terminal plate to a portion to be attached. <P>SOLUTION: In this tube type incandescent lamp composed of a filament disposed in an arc tube, sealed parts formed at both ends of the arc tube, the external leads projecting backward from the sealed parts, and the metal terminal plates combined with the external leads, the metal terminal plate having an opening locked to the portion to be attached comes very close to the back end face of the sealed part in at least a portion of its tip, and is parted from the back end face of the sealed part in the other portions of the tip. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tube-type incandescent light bulb used as a reading lamp for office automation equipment such as a copying machine or a heater lamp.

  For example, in a copying machine, a recording material on which a toner image made of unfixed toner is formed is passed between a heating roller and a pressure roller disposed in contact with the recording material, thereby pressing the unfixed toner under pressure. A pressure roller system is widely used in which the toner image is fixed to a recording material by heating at a temperature of 1. As a heat source of the heating roller system, a rod-shaped lamp, for example, a tube-type incandescent lamp is known.

  Such tube-type incandescent bulbs are often used as a single lamp, but in order to heat recording materials of different sizes at a uniform temperature over the entire surface, the same or different filament types can be used for switching adjustment. Several tube-type incandescent bulbs are also used.

  As a technology related to the tube-type incandescent bulb, for example, there is a technology described in Public Information No. 2-3653. An example of this type of tube-type incandescent lamp will be described with reference to the drawings. FIG. 8 is a schematic cross-sectional view of a tube-type incandescent bulb, and FIG. 9 is an enlarged cross-sectional view of the sealing portion 3 in FIG. The tube-type incandescent bulb has a filament 2 incorporated in a tubular quartz glass arc tube 1. A pair of left and right sealing portions 3 are formed at both ends of the filament 2. For example, a metal foil 4 made of molybdenum is embedded in each sealing portion 3, and the tips of rod-like external leads 5 are fixed to the metal foil 4. Further, a rectangular metal terminal plate 7 is fixed to the rear end of the external lead 5 at a welding point 6.

  The metal terminal plate 7 is a power receiving terminal that is electrically connected to an external power source (not shown), and is used for locking a required attachment portion (not shown) such as a copying machine in which a tube-type incandescent bulb is incorporated. An opening 71 is provided. In general, the opening 71 is designed to be large with respect to a diameter of a predetermined mounting screw, and has a circular and rectangular through hole, a notch, and the like.

  Further, for example, as shown in FIG. 9B, an electrically insulating base 8 made of ceramic, for example, may be provided between the rear end surface 31 of the sealing portion 3 and the metal terminal plate 7. The base 8 has a recess 81 formed in the front end surface on the filament side, and the rear end of the sealing portion 3 is accommodated in the recess 81. The base 8 has a through hole 82 having a diameter smaller than that of the recess 81 subsequent to the rear end of the recess 81 and allows the external lead wire 5 to be inserted therethrough. The base 8 is fixed by being sandwiched between the rear end surface 31 of the sealing portion 3 and the metal terminal plate 7 welded to the external lead 5.

  However, as shown in FIG. 10, in such a tube-type incandescent lamp, in order to lock the metal terminal plate 7 to a portion to be attached (not shown), an attachment screw is inserted into the opening 71 and the attachment screw is inserted. When it is rotated and tightened, the rotational torque at that time is applied to the metal terminal plate 7, and the metal terminal plate 7 rotates with the mounting screw in the direction of the arrow in FIG. When the metal terminal plate 7 rotates, the shoulder portion of the metal terminal plate 7 comes into contact with the sealing portion 3, and the contact portion 32 of the metal terminal plate 7 and the sealing portion 3 serves as a fulcrum to rotate the metal terminal plate 7. Since a force is generated, there is a risk of generating a force for pulling out the external lead 5.

When such a force for pulling out the external lead 5 is generated, the sealing portion 3 of the tube-type incandescent bulb may be damaged, or the welded portion between the external lead 5 and the metal foil 4 may be damaged. When the sealing part 3 is damaged, the metal foil 4 is exposed to the outside air, so that the oxidation is accelerated, and eventually the metal foil 4 is burned and becomes non-conductive, leading to a shortened life of the tube-type incandescent bulb. In addition, when the metal foil 4 is damaged, the conduction of the damaged portion is deteriorated, the electric resistance is increased, and it is excessively heated and burned, leading to a shortened life of the tube-type incandescent bulb.
Reality 2-3653

  The present invention has been made to solve the above-described problems in the sealing portion structure of a tube-type incandescent bulb. That is, an object of the present invention is to reduce or prevent the rotational torque generated when the metal terminal plate is locked to the attached portion from being transmitted to the sealing portion or the base and generating the force for pulling out the external lead. It is to provide a tube-type incandescent light bulb that can be used.

  According to the first aspect of the present invention, the filament disposed in the arc tube, the sealing portions formed at both ends of the arc tube, the external leads protruding backward from the sealing portions, and the external leads are fixed. In the tube-type incandescent lamp composed of a metal terminal plate, the metal terminal plate has an opening that is locked to the attached portion, and close to the rear end surface of the sealing portion at least at a part of the tip. The other portion of the tip is separated from the rear end surface of the sealing portion.

  According to a second aspect of the present invention, there is provided a filament disposed in the arc tube, sealing portions formed at both ends of the arc tube, external leads projecting rearward from the sealing portion, and ends of the sealing portion In a tube-type incandescent lamp composed of a base through which an external lead attached to a portion penetrates and a metal terminal plate fixed to the external lead, the metal terminal plate has an opening that is locked to the attached portion. The at least one portion of the tip is close to the rear end surface of the base and the other portion of the tip is separated from the rear end surface of the base.

  According to the tubular incandescent bulb according to the present invention, the rotational torque generated when the metal terminal plate is locked to the attached portion can be absorbed by the metal terminal plate and the external lead. As a result, it is possible to provide a tube-type incandescent bulb that prevents the generation of a force for pulling out the external lead.

  Hereinafter, the configuration of an embodiment of a tube-type incandescent bulb of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a tube-type incandescent bulb of the present invention, and FIG. 2 is an enlarged cross-sectional view of a sealing portion 3 shown in FIG. However, as for each member, let the arc tube center direction of a tube-type incandescent lamp be a front end, and let an external lead direction be a rear end.

  In the tube-type incandescent lamp, a coiled filament 2 made of, for example, a tungsten wire is disposed along a tube axis direction of the arc tube 1 inside a straight tubular arc tube 1 made of quartz glass. A pair of left and right sealing portions 3 are formed at both ends of the arc tube 1, and a metal foil 4 made of, for example, molybdenum foil is embedded in a state of being hermetically sealed with a pinch seal. The rear end of the filament 2 is fixed to the front end of the metal foil 4 by welding or the like. Further, the tip of the external lead 5, which is made of, for example, molybdenum or tungsten wire and protrudes rearward along the tube axis direction of the arc tube 1 from the sealing portion 3, is fixed to the rear end of the metal foil 4 by welding or the like. Yes. Further, a metal terminal plate 7 is fixed to the rear end of the external lead 5 by welding or the like at a welding point 6.

  The metal terminal plate 7 is a power receiving terminal that is electrically connected to an external power source (not shown), and is used to lock the tube-type incandescent bulb, for example, to a required mounting portion (not shown) such as a copying machine. An opening 71 is provided.

  As shown in FIG. 2A, the metal terminal plate 7 according to the present embodiment has a circular through-hole opening 71, the tip 72 is tapered, and the tip 72 is provided with a pointed portion 701. Is. By providing such a pointed portion 701, the metal terminal plate 7 is close to the rear end surface 31 of the sealing portion 3 at the apex of the pointed portion 701, and at a portion other than the apex of the pointed portion 701 at the tip 72. The rear end surface 31 of the sealing part 3 is separated by a.

  At this time, if the metal terminal plate 7 is in contact with the rear end surface 31 of the sealing portion 3 at the apex of the pointed portion 701, the axial length of the tube-type incandescent bulb is shortened, and the tube-type in the mounted device is reduced. Installation space for incandescent bulbs can be reduced. On the contrary, if the distance between the metal terminal plate 7 and the sealing portion 3 is 3 mm or more, the distance in the axial direction of the tube-type incandescent bulb increases due to this distance, and an error that cannot be ignored with respect to the installation space. Therefore, proximity means that the distance between the metal terminal plate 7 and the sealing portion 3 is preferably 3 mm or less, and the metal terminal plate 7 and the sealing portion 3 may be in contact with each other.

  As shown in FIG. 2 (b), by providing a pointed portion 701 at the tip 72 of the metal terminal plate 7, the metal terminal plate 7 is held in the opening 71 in order to lock the metal terminal plate 7 to a mounted portion (not shown). Insert the mounting screw, rotate and tighten the mounting screw, the rotational torque at that time is applied to the metal terminal plate 7, and the metal terminal plate 7 is mounted in the direction of the arrow in FIG. Even when rotated together with the screw, the apex of the pointed portion 701 of the metal terminal plate 7 moves away from the rear end surface 31 of the sealing portion 3, so that the metal terminal plate 7 is not brought into contact with the sealing portion 3. The rotational torque can be absorbed by rotating the external lead 5 with the contact portion 32 as a fulcrum. Further, since the metal terminal plate 7 is close to the rear end surface 31 of the sealing portion 3 only at the apex of the pointed portion 701, the rear end surface 31 of the sealing portion 3 is not perpendicular to the tube axis of the arc tube 1. Even in this case, the metal terminal plate 7 can be attached to a predetermined position regardless of the inclination of the rear end face 31.

  Subsequently, as shown in FIG. 3, an electrically insulating base 8 made of ceramic, for example, may be provided between the rear end surface 31 of the sealing portion 3 and the metal terminal plate 7. The base 8 has a recess 81 formed in the front end surface on the filament side, and the rear end of the sealing portion 3 is accommodated in the recess 81. The base 8 has a through hole 82 having a diameter smaller than that of the recess following the rear end of the recess 81 and allows the external lead 5 to be inserted therethrough. The base 8 is fixed by being sandwiched between the rear end surface 31 of the sealing portion 3 and the metal terminal plate 7 welded to the external lead 8. The metal terminal plate 7 according to the present embodiment has a rectangular through-hole opening 71, the tip 72 is tapered, and the tip 72 is provided with a pointed portion 701. By providing such a pointed portion 701, the metal terminal plate 7 is close to the rear end surface 84 of the base 8 at the apex of the pointed portion 701, and at the portion other than the apex of the pointed portion 701 at the tip 72. The rear end face 84 is separated from the rear end face 84 by a. However, proximity means that the distance between the metal terminal plate 7 and the base 8 is preferably 3 mm or less, and the metal terminal plate 7 and the base 8 may be in contact with each other.

  In this manner, by providing the pointed portion 701 at the tip 72 of the metal terminal plate 7, in order to lock the metal terminal plate 7 to the attached portion (not shown), an attachment screw is inserted into the opening 71, Even if the mounting screw is rotated and tightened, and the rotational torque at that time is applied to the metal terminal plate 7, the metal terminal plate 7 can be rotated with the mounting screw around the opening 71 to absorb the rotational torque. No force is generated to pull out the external lead 5 with the contact portion 83 as a fulcrum. Further, since the metal terminal plate 7 is close to the base 8 only at the apex of the pointed portion 701, even when the rear end surface 84 of the base 8 is not perpendicular to the tube axis of the arc tube 1, The metal terminal plate 7 can be attached at a predetermined position regardless of the inclination.

  Subsequently, as shown in FIG. 4, the metal terminal plate 7 according to the present embodiment has an opening 71 having a circular arc at the front end and a notch at the rear end, and the rear end surface 84 of the base 8 is tapered. A pointed portion 801 is provided and is disposed close to the base 8. By providing such a pointed portion 801, the base 8 is close to the metal terminal plate 7 at the apex of the pointed portion 801 on the rear end face 84 and is formed at a portion other than the apex of the pointed portion 801 on the rear end face 84. The terminal board 7 is separated from the terminal board 7 by a. However, proximity means that the distance between the metal terminal plate 7 and the base 8 is preferably 3 mm or less, and the metal terminal plate 7 and the base 8 may be in contact with each other.

  By providing the pointed portion 801 on the rear end face 84 of the base 8 in this way, an attachment screw is inserted into the opening 71 in order to lock the metal terminal plate 7 to the attached portion (not shown). Even if rotation torque is applied to the metal terminal plate 7 by rotating the screw, the metal terminal plate 7 is positioned near the apex of the pointed portion 801 of the rear end surface 84 of the base 8. By sliding along the surface and rotating the metal terminal plate 7 together with the mounting screw around the opening 71 to absorb the rotational torque, the force for pulling out the external lead 5 with the contact portion 83 as a fulcrum Does not occur. Further, since the metal terminal plate 7 is close only at the apex of the pointed portion 801 of the base 8, the metal terminal plate 7 can be attached at a predetermined position regardless of the inclination of the rear end face 84.

  Subsequently, as shown in FIG. 5A, the metal terminal plate 7 according to the present embodiment has an opening 71 of an oval through hole, a curved portion 702 is provided at the tip 72, and the tip 72 is fan-shaped. It was made to. By providing such a bent portion 702, the metal terminal plate 7 is close to the rear end surface 31 of the sealing portion 3 at the apex of the bent portion 702 of the tip 72, and at a portion other than the apex of the bent portion 702 of the tip 72. The rear end surface 31 of the sealing part 3 is separated by a. However, the proximity means that the distance between the metal terminal plate 7 and the sealing portion 3 is preferably 3 mm or less, and the metal terminal plate 7 and the sealing portion 3 may be in contact with each other.

  In this way, by making the tip 72 of the metal terminal plate 7 into a fan shape, in order to lock the metal terminal plate 7 to the attached portion (not shown), an attachment screw is inserted into the opening 71 and the attachment screw is inserted. Even if rotational torque is applied to the metal terminal plate 7 by rotating it, the metal terminal plate 7 can be rotated with the mounting screw around the opening 71 to absorb the rotational torque. No force is generated to pull out the external lead 5 with the portion 32 as a fulcrum. Further, since the metal terminal plate 7 is close to the rear end surface 31 of the sealing portion 3 only at the apex of the curved portion 702, the rear end surface 31 of the sealing portion 3 is not perpendicular to the tube axis of the arc tube 1. In addition, the metal terminal plate 7 can be attached to a predetermined position regardless of the inclination of the rear end face 31. Furthermore, even when the side surface of the metal terminal plate 7 is inadvertently applied to a device to be attached and a large rotational torque is applied, the metal terminal plate 7 and the rear end surface 31 of the sealing portion 3 are not in close contact. No force to pull out the external lead 5 is generated.

  Subsequently, as shown in FIG. 5B, an electrically insulating base 8 made of ceramic, for example, may be provided between the rear end surface 31 of the sealing portion 3 and the metal terminal plate 7. The metal terminal plate 7 according to the present embodiment has an opening 71 of an oval through hole, a curved portion 702 is provided at the tip 72, and the tip 72 is fan-shaped. By providing such a curved portion 702, the metal terminal plate 7 is close to the rear end surface 84 of the base 8 at the apex of the curved portion 702 of the tip 72, and at the portion other than the apex of the curved portion 702 of the tip 72. The rear end face 84 is separated from the rear end face 84 by a. However, proximity means that the distance between the metal terminal plate 7 and the base 8 is preferably 3 mm or less, and the metal terminal plate 7 and the base 8 may be in contact with each other.

  In this way, by making the tip 72 of the metal terminal plate 7 into a fan shape, in order to lock the metal terminal plate 7 to the attached portion (not shown), an attachment screw is inserted into the opening 71 and the attachment screw is inserted. Even if rotational torque is applied to the metal terminal plate 7 by rotating it, the metal terminal plate 7 can be rotated with the mounting screw around the opening 71 to absorb the rotational torque. A force for pulling out the external lead 5 with the portion 83 as a fulcrum is not generated. In addition, since the metal terminal plate 7 is close to the rear end surface 84 of the base 8 only at the apex of the curved portion 702, even when the rear end surface 84 of the base 8 is not perpendicular to the tube axis of the arc tube 1, The metal terminal plate 7 can be attached to a predetermined position regardless of the inclination of the rear end face 84. Furthermore, even when the side surface of the metal terminal plate 7 is inadvertently applied to a device to be attached and a large rotational torque is applied, the metal terminal plate 7 and the rear end surface 84 of the base 8 are not in close contact with each other. No force to pull out 5 is generated.

  Subsequently, as shown in FIG. 6, the metal terminal plate 7 according to the present embodiment has a rectangular opening 71 in which one side end is notched, and a curved portion 802 is formed on the rear end face 84 of the base 8. It is provided in the form of a fan and is disposed close to the base 8. In this way, the metal terminal plate 7 is separated from the base 8 at the end face in the rotation direction of the mounting screw, that is, at the contact portion 83 between the metal terminal plate 7 and the base 8 of the tube-type incandescent lamp according to the prior art. That's fine. By providing such a curved portion 802, the shoulder portion 703 of the metal terminal plate 7 is close to the rear end surface 84 of the base 8 and is separated from the rear end surface 84 by a in portions other than the shoulder portion 703 of the front end 72. It is the composition which is. However, proximity means that the distance between the metal terminal plate 7 and the base 8 is preferably 3 mm or less, and the metal terminal plate 7 and the base 8 may be in contact with each other.

  By making the rear end face 84 of the base 8 into a fan shape in this way, in order to lock the metal terminal plate 7 to the attached portion (not shown), an attachment screw is inserted into the opening 71 and the attachment screw is rotated. Even if the rotational torque at that time is applied to the metal terminal plate 7, the contact portion 83 of the metal terminal plate 7 and the base 8 is rotated with respect to the tube axis of the arc tube 1. Since the rotation torque can be absorbed by rotating the metal terminal plate 7 around the opening 71 of the metal terminal plate 7, no force for pulling out the external lead 5 is generated. Further, since the metal terminal plate 7 is close to the base 8 only at the shoulder portion 703, even when the rear end surface 84 of the base 8 is not perpendicular to the tube axis of the arc tube 1, The metal terminal plate 7 can be attached at a predetermined position regardless of the inclination.

  Subsequently, as shown in FIG. 7, the metal terminal plate 7 according to the present embodiment has a circular through hole opening 71, and the base 8 has a rear end surface 84 formed into a pointed shape, thereby forming a concave pointed portion 803. And is disposed close to the base 8. By providing such a concave pointed portion 803, the metal terminal plate 7 is close to the rear end surface 84 of the base 8 at the shoulder portions 703 on both sides, and at the portions other than the shoulder portions 703 on both sides of the tip 72. The rear end face 84 is separated from the rear end face 84. However, proximity means that the distance between the metal terminal plate 7 and the base 8 is preferably 3 mm or less, and the metal terminal plate 7 and the base 8 may be in contact with each other.

  By making the rear end face 84 of the base 8 pointed like this, in order to lock the metal terminal plate 7 to the attachment portion (not shown), an attachment screw is inserted into the opening 71 and the attachment screw is inserted. Even if rotational torque is applied to the metal terminal plate 7, the shoulder portion 703 adjacent to the rear end surface 84 of the base 8 of the metal terminal plate 7 is slid along the rear end surface 84 of the base 8. Thus, the metal terminal plate 7 can be rotated together with the mounting screw around the opening 71 to absorb the rotational torque, so that no force for pulling out the external lead 5 is generated. Furthermore, when aligning the metal terminal plate 7 and the base 8, the tip 72 of the metal terminal plate 7 is easily formed on the concave pointed portion 803 of the base 8 by applying the metal terminal plate 7 to the base 8. It has the advantage that it can be centered.

Schematic sectional view of the tubular incandescent bulb of the present invention The expanded sectional view of the tube type incandescent bulb sealing part of the present invention The expanded sectional view of the tube type incandescent bulb sealing part of the present invention The expanded sectional view of the tube type incandescent bulb sealing part of the present invention The expanded sectional view of the tube type incandescent bulb sealing part of the present invention The expanded sectional view of the tube type incandescent bulb sealing part of the present invention The expanded sectional view of the tube type incandescent bulb sealing part of the present invention Schematic sectional view of a conventional tube-type incandescent bulb Expanded cross-sectional view of a conventional tube-type incandescent bulb sealing part Expanded cross-sectional view of a conventional tube-type incandescent bulb sealing part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arc tube 2 Filament 3 Sealing part 4 Metal foil 5 External lead 6 Welding point 7 Metal terminal board 8 Base 31 Rear end surface 32 Abutting part 71 Insertion hole 72 Abutting part 81 Recess 82 Opening 83 Abutting part 84 Rear end face 701 Taper 702 Curved part 703 Shoulder part 801 Pointed part 802 Curved part 803 Concave pointed part

Claims (2)

A tube composed of a filament disposed in the arc tube, a sealing portion formed at both ends of the arc tube, an external lead protruding backward from the sealing portion, and a metal terminal plate fixed to the external lead Type incandescent bulbs,
The metal terminal plate has an opening that is locked to the attached portion, and is close to the rear end surface of the sealing portion at least at a part of the tip, and from the rear end surface of the sealing portion at the other part of the tip. A tube-type incandescent light bulb characterized by being spaced apart. A filament disposed in the arc tube, a sealing portion formed at both ends of the arc tube, an external lead protruding backward from the sealing portion, and an external lead attached to the end of the sealing portion penetrate In a tube-type incandescent bulb composed of a base to be connected and a metal terminal plate fixed to an external lead,
The metal terminal plate has an opening that is locked to the attached portion, is close to the rear end surface of the base at at least a part of the front end, and is separated from the rear end surface of the base at the other part of the front end. A tube-type incandescent bulb characterized by that.

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