Lamp with base and heating device

Abstract

The present invention provides the following structure: a lamp with a base, comprising an incandescent lamp and a base, the incandescent lamp comprising a light-emitting tube and a sealing portion provided at the end of the light-emitting tube, and an external lead protruding from the sealing portion, the base being engaged with the sealing portion, and being able to follow the thermal expansion of a device in which the lamp is assembled without applying a stress load while maintaining axial dimensional accuracy. The plate-shaped power supply terminal accommodated in the accommodation space of the base is rotated from a position inserted into a terminal insertion hole of the base, and the external lead is welded and joined to the power supply terminal in a manner that the power supply terminal is separated from the inner wall surface of the accommodation space on the sealing portion side, and the base is configured to be movable in the axial direction.

Description

Technical Field

[0001] The present invention relates to a lamp with a base and a heating device equipped with the lamp with a base, and in particular to a lamp with a base in which an external lead wire of the lamp is welded and joined to a power supply terminal of a power supply line in the base, and a heating device. Background Art

[0002] Conventionally, incandescent lamps used as heating light sources for toner fixing in copiers, laser beam printers, etc., most of them have external leads extending from sealed portions at both ends to the outside of the light emitting tube and power supply terminals attached to the power supply lines welded together in a base.

[0003] Moreover, as a fixing mechanism for the base and the sealing portion, there are known structures using adhesives such as cement and structures not using adhesives. As a fixing method without using adhesives, for example, Japanese Patent No. 5454417 (Patent Document 1), Japanese Patent No. 5454429 (Patent Document 2), Japanese Patent Publication No. 2017-191673 (Patent Document 3), etc. are known, and there are known types that can limit axial movement and improve dimensional accuracy, types in which leads extend laterally, etc.

[0004] As described above, various studies have been conducted on structures that do not use adhesives as a method of fixing the lamp sealing portion and the base, thereby significantly improving the dimensional accuracy in the axial direction of the lamp.

[0005] However, the supporting part that fixes the lamp in the heating device may cause thermal expansion when the lamp is lit. There is a problem that the lamp cannot keep up with the thermal expansion (it shrinks when the lamp is off) and a large stress load is applied to the lamp. This problem becomes particularly prominent as the axial dimensional accuracy of the lamp becomes higher.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent No. 5454417

[0009] Patent Document 2: Japanese Patent No. 5454429

[0010] Patent Document 3: Japanese Patent Application Publication No. 2017-191673 Summary of the invention

[0011] Problems that the invention will solve

[0012] In view of the problems of the prior art, the present invention aims to provide a lamp with a base in which an external lead wire and a power supply wire are connected by welding in a base provided at both ends of a light-emitting tube, which can maintain axial dimensional accuracy while following the thermal expansion of a heating device in which the lamp is assembled without applying a stress load.

[0013] Means for solving problems

[0014] In order to solve the above-mentioned problems, in the lamp with a base of the invention, there are an incandescent lamp and a base, the incandescent lamp has a light-emitting tube and a sealing part provided at the end of the light-emitting tube, and an external lead protrudes from the sealing part, the base is engaged with the sealing part, and a receiving space is formed inside the base, the receiving space receives a plate-shaped power supply terminal mounted on the power supply line, and the power supply terminal is joined with the external lead, and a welding hole is provided in the base so as to pass through the receiving space, and a terminal insertion hole is provided in the base so that the power supply terminal can be inserted into the receiving space, the power supply terminal is rotated in the receiving space and retained in the receiving space, the external lead is welded to the power supply terminal so that the power supply terminal is separated from the inner wall surface on the sealing part side of the receiving space in the axial direction of the incandescent lamp, and the base is configured to be movable in the axial direction relative to the power supply terminal.

[0015] In addition, the invention is characterized in that an engaging protrusion for limiting the rotation range of the power supply terminal is formed inside the accommodation space.

[0016] Furthermore, the terminal insertion hole is characterized in that it has a flat shape that follows the shape of the terminal, and the terminal insertion hole is formed so that its longitudinal axis is inclined with respect to the penetration direction of the welding hole.

[0017] In addition, it is characterized in that in a heating device installed with the lamp with a base, the heating device has a receiving device for installing and supporting the base, and the base is installed and supported on the receiving device in the axial direction of the incandescent lamp so that the power supply terminal is separated from the inner wall surface of the sealing portion side of the housing space.

[0018] Furthermore, the present invention is characterized in that the base is mounted and supported on the receiving device in a state of being in contact with an inner wall surface of the housing space on the power supply line side.

[0019] Effects of the Invention

[0020] According to the invention, the external lead is welded to the power supply terminal in such a manner that the power supply terminal is separated from the inner wall surface of the sealing portion side of the incandescent lamp in the accommodation space, and the base is constructed to be movable in the axial direction. Therefore, even if the receiving portion that fixes the lamp in the heating device causes thermal expansion when the lamp is lit, since the base can move axially relative to the lamp, undesirable stress loads will not be applied to the lamp, and its breakage can be avoided.

[0021] Furthermore, by mounting and supporting the power supply terminal on the receiving member of the heating device in a state of contact with the inner wall surface of the housing space on the power supply line side of the incandescent lamp, the axial position of the arc tube in the heating device can be appropriately and accurately maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view of the end of the lamp with a base according to the present invention.

[0023] Figure 2 yes Figure 1 An enlarged cross-sectional view of the end portion.

[0024] Figure 3 It has changed Figure 2 A 90° cross-sectional view.

[0025] Figure 4 It is an enlarged cross-sectional view of an end portion of another embodiment of the present invention.

[0026] Figure 5 It is a cross-sectional view (A) of an end portion and an XX cross-sectional view (B) thereof of still another embodiment of the present invention.

[0027] Figure 6 It is a side view (A) of the base of this invention, and a side view (B) of another embodiment.

[0028] Figure 7 It is a side view of another embodiment of the terminal insertion hole of the base of the present invention.

[0029] Figure 8 This is a cross-sectional view of an example of a structure in which the lamp with a base of the present invention is mounted on a device.

[0030] Fig. 9 yes Figure 8 An enlarged cross-sectional view of both ends (A) and a cross-sectional view during thermal expansion (B).

[0031] Description of Reference Numerals

[0032] 1: Incandescent lamp

[0033] 2: LED

[0034] 21: Sealing part

[0035] 3: Base

[0036] 31: Welding hole

[0037] 32: Terminal insertion hole

[0038] 33: Sealing part insertion hole

[0039] 34: Containment Space

[0040] 34a: Inner wall surface on the power supply line side

[0041] 34b: Inner wall surface on the sealing part side

[0042] 34c: Circular inner wall

[0043] 35: Connecting hole

[0044] 4: External leads

[0045] 5: Power supply line

[0046] 6: Power supply terminal

[0047] 8: Engagement protrusion

[0048] 10: Receiver (for heating device)

[0049] X: The length direction axis of the terminal insertion hole

[0050] Y: The penetration direction of the welding hole DETAILED DESCRIPTION

[0051] exist Figure 1 , a stereoscopic view of the end of a lamp with a base which is the object of the present invention is shown, wherein a base 3 is mounted on the end of a light-emitting tube 2 of the lamp with a base 1, a welding hole 31 is formed on the base 3 so as to penetrate the base 3 orthogonally to the axial direction, and a terminal insertion hole 32 is formed on the end of the base 3 along the axial direction.

[0052] In addition, Figure 1 Only one end side of the lamp 1 is shown in the figure, but the other end side also has the same structure.

[0053] exist Figure 2 The cross-sectional structure of the end of the incandescent lamp 1 including the base 3 is shown in FIG. Figure 3 The Figure 2 The cross-sectional structure is rotated 90 degrees.

[0054] Furthermore, a seal insertion hole 33 is formed in the axial direction at the other end of the base 3 , and a housing space 34 is formed at the center. The seal insertion hole 33 and the housing space 34 are communicated with each other via a communication hole 35 .

[0055] In addition, if Figure 3 As shown, the welding hole 31 is in communication with the accommodation space 34 orthogonally, and the terminal insertion hole 32 is in communication with the accommodation space 34 in the axial direction.

[0056] The sealing portion 21 at the end of the arc tube 2 of the lamp with base 1 is inserted into the sealing portion insertion hole 33 of the base 3, while the plate-shaped power supply terminal 6 connected to the power supply line 5 is inserted into the receiving space 34 of the base 3 through the terminal insertion hole 32.

[0057] At this time, if Figure 2 As clearly shown, the axial width A of the power supply terminal 6 is smaller than the axial dimension B of the accommodation space 34 , and there is some margin in the axial direction of the lamp 1 within the accommodation space 34 .

[0058] After being received in the receiving space 34 via the terminal insertion hole 32, the plate-shaped power supply terminal 6 is rotated at a predetermined angle to prevent it from being pulled out of the receiving space 34. At this time, the power supply terminal 6 is positioned in a state separated from the inner wall surface 34b of the receiving space 34 on the sealing portion 21 side in the axial direction of the incandescent lamp 1.

[0059] Furthermore, the plate-shaped power supply terminal 6 is arranged so that, after being rotated in the accommodation space 34 , the flat surface portion of the power supply terminal 6 faces the welding hole 31 .

[0060] On the other hand, the external lead wire 4 led out from the sealing portion 21 of the lamp 1 extends through the communication hole 35 to the power supply terminal 6 in the accommodation space 34 and is positioned so as to overlap with the power supply terminal 6 .

[0061] In this state, Figure 3 A welding jig (not shown) is inserted into the upper and lower welding holes 31 to weld and join the external lead wires 4 and the power supply terminals 6 together.

[0062] As a result, the base 3 can be slightly moved in the axial direction relative to the lamp 1 .

[0063] However, when the lamp 1 is assembled into a heating device, Figure 2 As shown, the base 3 is mounted on a receiving device 10 for supporting the heating device. Even if the heating device, i.e., the receiving device 10, expands thermally, the base 3 can move axially relative to the lamp 1, thereby absorbing the thermal expansion of the device side and avoiding the application of undesirable stress loads to the lamp 1.

[0064] exist Figure 42 shows another embodiment of mounting a lamp with a base on a heating device. The power supply terminal 6 is arranged in the axial direction of the lamp 1 to abut against the inner wall surface 34a on the side of the power supply line 5 in the accommodating space 34. In this state, the base 3 is mounted on the receiving device 10 on the side of the heating device. In this way, the axial position of the lamp light tube can be appropriately and accurately maintained relative to the heating device.

[0065] Figure 5 (A) and (B) further show other embodiments, in which an engaging protrusion 8 for limiting the rotation of the power supply terminal 6 is provided in the accommodation space 34 of the base 3 .

[0066] Therefore, if Figure 5 As shown in (B), when the power supply terminal 6 is inserted into the receiving space 34 through the terminal insertion hole 32 and then rotated, the power supply terminal 6 stops at a predetermined rotation position due to the engaging protrusion 8, and can be arranged at an appropriate position relative to the welding hole 31, so that the welding operation can be performed accurately and easily. Usually, the plane of the plate-shaped power supply terminal 6 is arranged approximately orthogonal to the penetration direction of the welding hole 31.

[0067] In addition, although the engaging protrusion 8 is shown to be formed on the inner wall surface 34b of the sealing portion 21 side of the accommodating space 34, it can also be formed on the portion without the welding hole 31 of the circumferential inner wall surface 34c of the accommodating space 34. In addition, the engaging protrusion 8 is shown as a pair of two, but it can also be one

[0068] exist Figure 6 A specific example of the structure and arrangement of the terminal insertion hole 32 is shown in FIG. Figure 6 In (A), the terminal insertion hole 32 has a rectangular cross-section, and its longitudinal axis X coincides with the penetration direction Y of the welding hole 31 .

[0069] In addition, Figure 6 In (B), the longitudinal axis X of the terminal insertion hole 32 is inclined relative to the penetration direction Y of the welding hole 31. Thus, when the power supply terminal 6 is rotated in the accommodation space 34 to be arranged orthogonal to the penetration direction Y of the welding hole 31, the rotation amount can be reduced and the working efficiency can be improved.

[0070] exist Figure 7 , another embodiment of the terminal insertion hole 32 is shown, and the terminal insertion hole 32 includes a power supply line insertion portion 32a with a circular cross-sectional shape in the center and a power supply terminal insertion portion 32b with a quadrilateral cross-sectional shape formed above and below it. According to this embodiment, when the power supply terminal 6 is inserted, the power supply line 5 is guided by the power supply line insertion portion 32a with a shape that follows the shape of the power supply line, so that the power supply terminal 6 does not swing unnecessarily, and the insertion operation becomes easy.

[0071] In addition, in this embodiment, Figure 6As shown in FIG. 2B , the longitudinal axis of the terminal insertion hole 32 may be inclined relative to the penetration direction of the welding hole 31.

[0072] exist Figure 8 1 shows an example of a structure in which the lamp with a base 1 of the present invention is mounted on a heating device. The lamp with a base 1 is mounted on a receiving device 10 of the heating device at bases 3 at both ends thereof.

[0073] like Fig. 9 (A) shows in detail the positional relationship of the power supply terminals 6 in the storage space 34 when the bases 3 at both ends of the lamp 1 with a base are attached to the receiving device 10 of the heating device.

[0074] The power supply terminal 6 is restricted from moving in the axial direction of the lamp tube by the inner wall surface 34 a of the housing space 34 on the power supply line 5 side, so that the position of the lamp tube is appropriately determined.

[0075] Furthermore, the power supply terminal 6 is disposed in a state of being separated from the inner wall surface 34 b of the housing space 34 on the sealing portion 21 side.

[0076] In this mounting structure, as described above, even if the receiving device 10 is affected by heat and expands, the base 3 can move relative to the arc tube 2 of the lamp 1, so that unnecessary stress is not applied to the arc tube 2 of the lamp 1.

[0077] Fig. 9 (B) shows the relative positional relationship between the socket 10 of the heating device, the bases 3 at both ends of the lamp 1 with a base, and the power supply terminals 6 in the storage space 34 when the socket 10 of the heating device is thermally expanded by the heat.

[0078] When the receiving device 10 expands thermally, the bases 3 mounted on both ends of the lamp 1 with a base move toward the inner wall surface 34b of the sealing portion 21 of the storage space 34 toward the power supply terminal 6 as shown by arrows A. Fig. 9 As shown in (A), the wall surface 34b and the power supply terminal 6 are kept separated in advance, so that even when the receiving device 10 thermally expands, stress load is not applied to the lamp 1, and damage to the lamp 1 can be avoided.

[0079] As described above, according to the present invention, the power supply terminal is rotated from a position where it is inserted into the accommodation space of the base through the terminal insertion hole, and the external lead of the lamp is welded to the power supply terminal in a state where the power supply terminal is separated from the inner wall surface of the sealing portion side of the lamp in the accommodation space in the axial direction of the lamp. The base is constructed to be able to move axially relative to the power supply terminal, so that even if there is thermal expansion on the device side where the lamp is installed, the thermal expansion can be absorbed and no undesirable stress load is applied to the lamp.

[0080] Furthermore, by mounting and supporting the power supply terminal on the receiving device while contacting the inner wall surface of the storage space on the power supply line side of the incandescent lamp, the axial position of the lamp arc tube in the heating device can be appropriately and accurately maintained.

Claims

1. A lamp with a base, It is characterized in that The incandescent lamp comprises a light-emitting tube and a sealing portion provided at the end of the light-emitting tube, and an external lead wire protrudes from the sealing portion, and the sealing portion is engaged with the base. A receiving space is formed inside the base, the receiving space receives a plate-shaped power supply terminal mounted on the power supply line, and the power supply terminal is connected to the external lead wire, and A welding hole is provided through the base in a manner of passing through the receiving space, The base is provided with a terminal insertion hole for the power supply terminal to be inserted into the accommodation space. The power supply terminal is rotated in the accommodation space and held in the accommodation space, and the external lead is welded to the power supply terminal so that the power supply terminal is separated from the inner wall surface of the sealing portion of the accommodation space in the axial direction of the incandescent lamp. The base is configured to be movable in the axial direction relative to the power supply terminal.

2. The lamp with a base according to claim 1, It is characterized in that An engaging protrusion for limiting the rotation range of the power supply terminal is formed inside the accommodation space.

3. The lamp with a base according to claim 1, It is characterized in that The terminal insertion hole is a flat shape that follows the shape of the terminal. The terminal insertion hole is formed so that the longitudinal axis thereof is inclined with respect to the penetration direction of the welding hole.

4. A heating device, equipped with the lamp with a base as claimed in any one of claims 1 to 3, It is characterized in that A receiving device for mounting and supporting the base is provided, The base is mounted and supported on the receiving device in the axial direction of the incandescent lamp in a state where the power supply terminal is separated from the inner wall surface of the housing space on the sealing portion side.

5. The heating device according to claim 4, It is characterized in that The base is mounted and supported on the receiving device in a state of being in contact with an inner wall surface of the housing space on the power supply line side.

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