JP7229464B2 - Lamps and heating devices with bases - Google Patents

Description

The present invention relates to a lamp with a base and a heating device equipped with the lamp, and more particularly to a lamp with a base and a heating device in which a power supply terminal of a power supply line is welded to an external lead of the lamp in the base. It is a thing.

Conventionally, filament lamps used as heat sources for fixing toner in copiers, laser beam printers, etc. have external leads led out of the arc tube from sealed portions at both ends, and power supply terminals attached to power supply lines. are welded and joined within the base.

As means for fixing the base and the sealing portion, there are known those that use an adhesive such as cement and those that do not use an adhesive. As a fixing method that does not use an adhesive, for example, Japanese Patent No. 5454417 (Patent Document 1), Japanese Patent No. 5454429 (Patent Document 2), Japanese Patent Laid-Open No. 2017-191673 (Patent Document 3), etc. are known. , those with improved dimensional accuracy by restricting movement in the axial direction, and lateral lead wire types are known.

As described above, as a method of fixing the lamp sealing portion and the base, various studies have been made on a structure that does not use an adhesive, and this has greatly improved the dimensional accuracy in the axial direction of the lamp.
However, the receiving part that fixes the lamp in the heating device may thermally expand when the lamp is turned on, and the lamp cannot follow this thermal expansion (thermal contraction when the lamp is turned off), and a large stress load is applied to the lamp. This problem becomes more pronounced as the dimensional accuracy in the axial direction of the lamp increases.

Japanese Patent No. 5454417 Japanese Patent No. 5454429 JP 2017-191673 A

In view of such problems of the prior art, an object of the present invention is to provide a base-equipped lamp having a structure in which an external lead and a feeder wire are weld-connected within the bases provided at both ends of the arc tube. To provide a structure which does not apply a stress load by following the thermal expansion of a heating device in which a lamp is incorporated while maintaining the dimensional accuracy of the lamp.

In order to solve the above problems, a lamp with a base according to the present invention includes a filament lamp comprising an arc tube, a sealing portion provided at an end thereof, and an external lead protruding from the sealing portion; A lamp with a base comprising a base to which a stopper is fitted, wherein a plate-shaped power supply terminal attached to a power supply line is accommodated inside the base, and the power supply terminal and the external lead are joined together. An accommodation space is formed, a welding hole is provided through the base so as to pass through the accommodation space, and the base is provided with a terminal insertion hole through which the power supply terminal can be inserted up to the accommodation space. The power supply terminal rotates in the accommodation space and is held in the accommodation space. The external lead and the power supply terminal are welded together so as to be separated from the inner wall surface, and the base is configured to be axially movable with respect to the power supply terminal.

Further, an engagement projection is formed inside the housing space for restricting a rotation range of the power supply terminal.
Further, the terminal insertion hole has a flat shape conforming to 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. .

Further, in the heating device to which the lamp with a base is attached, the heating device includes a receiving tool for attaching and supporting the base, and the base connects the power supply terminal to the accommodation space in the axial direction of the filament lamp. It is attached to and supported by the receiver while being spaced apart from the inner wall surface on the side of the sealing portion.
Further, the base is attached to and supported by the receiving tool in a state of being in contact with the inner wall surface of the accommodation space on the power supply line side.

According to the present invention, the external lead and the power supply terminal are welded together so that the power supply terminal is separated from the inner wall surface of the housing space on the sealing portion side of the filament lamp, and the base is configured to be movable in the axial direction. Therefore, even if the receiving part that secures the lamp in the heating device may undergo thermal expansion when the lamp is ignited, the base can move axially with respect to the lamp, thus undesirably stressing the lamp. It is possible to prevent the damage in advance.
In addition, by attaching and supporting the power supply terminal to the holder of the heating device in a state where the power supply terminal is in contact with the inner wall surface of the housing space on the power supply line side of the filament lamp, the position of the lamp arc tube in the heating device in the axial direction can be adjusted. can be properly and accurately maintained.

1 is a perspective view of the end of a lamp with a base of the present invention; FIG. FIG. 2 is an enlarged cross-sectional view of the end of FIG. 1; Sectional drawing which changed the 90-degree angle of FIG. FIG. 4 is an enlarged cross-sectional view of an end portion of another embodiment of the present invention; Sectional view (A) of the end portion of still another embodiment of the present invention, and its XX sectional view (B). Side view (A) of the base of the present invention, side view (B) of another embodiment. FIG. 4 is a side view of another embodiment of the terminal insertion hole of the base of the present invention; 1 is a cross-sectional view of an example of a structure for attaching a lamp with a base of the present invention to a device; FIG. FIG. 8 is an enlarged sectional view (A) of both ends of FIG. 8, and a sectional view (B) at the time of thermal expansion.

FIG. 1 shows a perspective view of an end portion of a lamp with a base, which is the object of the present invention. A welding hole 31 is formed so as to pass through the base 3 perpendicularly to the axial direction, and a terminal insertion hole 32 is formed in the end portion of the base 3 in the axial direction.
Although only one end side of the lamp 1 is shown in FIG. 1, the other end side has the same structure.
FIG. 2 shows a cross-sectional structure of an end portion of the filament lamp 1 including the base 3, and FIG. 3 shows a cross-sectional structure obtained by rotating the angle of FIG. 2 by 90 degrees.
Further, a sealing portion insertion hole 33 is formed in the other end portion of the base 3 in the axial direction, and a housing space 34 is formed in the central portion. communicate with each other through a communication hole 35 .
Further, as shown in FIG. 3, the welding hole 31 communicates with the accommodation space 34 so as to be perpendicular to the accommodation space 34, and the terminal insertion hole 32 communicates with the accommodation space 34 in the axial direction.

The sealing portion 21 at the end of the arc tube 2 of the lamp 1 with a base 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 a terminal. It is inserted and housed in the housing space 34 of the base 3 via the insertion hole 32 .
At this time, as best shown in FIG. 2, the axial width A of the power supply terminal 6 is smaller than the axial dimension B of the housing space 34, and the lamp 1 is located within the housing space 34. There is some margin in the axial direction.

After the plate-shaped power supply terminal 6 is accommodated in the accommodation space 34 through the terminal insertion hole 32 , it is rotated by a predetermined angle and is prevented from coming out of the accommodation space 34 . At this time, the power supply terminal 6 is positioned so as to be separated from the inner wall surface 34b of the housing space 34 on the side of the sealing portion 21 in the axial direction of the filament lamp 1 .
After the plate-shaped power supply terminal 6 is rotated in the accommodation space 34 , the flat surface of the power supply terminal 6 is arranged so as to face the welding hole 31 .
On the other hand, the external lead 4 led out from the sealing portion 21 of the lamp 1 extends to the power supply terminal 6 in the accommodation space 34 through the communication hole 35 and is positioned so as to overlap the power supply terminal 6 .
In this state, a welding jig (not shown) is inserted into the upper and lower welding holes 31 shown in FIG.
Thereby, the base 3 can be moved in the axial direction with respect to the lamp 1 by a small amount.

Thus, when the lamp 1 is incorporated into a heating device, as shown in FIG. Even if the base 3 expands, the ability of the base 3 to move in the axial direction with respect to the lamp 1 absorbs the thermal expansion of the device and prevents the lamp 1 from being subjected to an undesired stress load.

FIG. 4 shows another embodiment for attaching a lamp with a base to a heating device, in which the power supply terminal 6 contacts the inner wall surface 34a of the housing space 34 on the side of the power supply line 5 in the axial direction of the lamp 1. In this state, the base 3 is attached to the holder 10 on the heating device side. By doing so, the axial position of the arc tube of the lamp can be properly and accurately positioned with respect to the heating device. It is something that can be maintained.

Still another embodiment is shown in FIGS. 5A and 5B, in which an engagement projection 8 is provided in the housing space 34 of the base 3 to restrict rotation of the power supply terminal 6. As shown in FIG.
As a result, as shown in FIG. 5B, when the power supply terminal 6 is rotated after being inserted into the accommodation space 34 through the terminal insertion hole 32, the power supply terminal 6 is held by the engaging projection 8 in a predetermined position. It is stopped at the rotating position, and can be disposed at an appropriate position to face the welding hole 31, so that the welding work can be performed accurately and easily. Normally, the plane of the plate-like power supply terminal 6 is arranged so as to be substantially orthogonal to the penetration direction of the welding hole 31 .
Although the engaging protrusion 8 is shown formed on the inner wall surface 34b of the housing space 34 on the side of the sealing portion 21, it is formed on a portion of the circumferential inner wall surface 34c of the housing space 34 where there is no welding hole 31. can also be formed. Also, although a pair of two engaging projections 8 is shown, one engaging projection may be provided.

A specific example of the structure and arrangement of the terminal insertion hole 32 is shown in FIG. 6. In FIG. It matches the direction Y.
6B, the longitudinal axis X of the terminal insertion hole 32 is inclined with respect to the penetration direction Y of the welding hole 31. As shown in FIG. By doing so, when the power supply terminal 6 is rotated in the accommodation space 34 to be arranged orthogonally to the penetration direction Y of the welding hole 31, the amount of rotation can be reduced, and the working efficiency is improved.

Another embodiment of the terminal insertion hole 32 is shown in FIG. 32b. 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 having a shape conforming to the shape of the power supply line. The insertion work becomes easier.
Also in this embodiment, the longitudinal axis of the terminal insertion hole 32 may be inclined with respect to the penetration direction of the weld hole 31 as shown in FIG. 6B.

FIG. 8 shows an example of a structure for attaching the lamp 1 with a base of the present invention to a heating device.

Details thereof are shown in FIG. 9A, which illustrates the positional relationship of the power supply terminals 6 in the housing space 34 when the bases 3 at both ends of the lamp 1 with a base are attached to the holders 10 of the heating device. It is shown
The power supply terminal 6 is restricted from moving in the axial direction of the lamp arc tube by the inner wall surface 34a of the accommodation space 34 on the side of the power supply line 5, so that the position of the lamp arc tube is properly determined.
Further, the power supply terminal 6 is arranged in a state separated from the inner wall surface 34b of the housing space 34 on the sealing portion 21 side.
In such a mounting structure, as described above, even if the receiver 10 is thermally expanded, the base 3 is movable with respect to the arc tube 2 of the lamp 1. Unnecessary stress is not applied to the arc tube 2 of the lamp 1.

FIG. 9B shows the relationship between the receiver 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 accommodation space 34 when the receiver 10 of the heating device thermally expands due to thermal influence. positional relationship.
When the receiving member 10 thermally expands, the bases 3 at both ends of the lamp 1 with a base attached to the receiving member 10, as indicated by the arrow A, have an inner wall surface 34b of the housing space 34 on the side of the sealing portion 21 that is the power supply terminal. Move toward 6. At this time, as shown in FIG. 9(A), since the wall surface 34b and the power supply terminal 6 are previously held in a state of being separated from each other, a stress load is applied to the lamp 1 even when the receiver 10 thermally expands. Therefore, damage to the lamp 1 can be avoided.

As described above, according to the present invention, the power supply terminal is rotated from the position where it is inserted into the accommodation space of the base through the terminal insertion hole, and the power supply terminal is moved in the axial direction of the lamp so that the lamp is sealed in the accommodation space. The outer lead of the lamp and the power supply terminal are welded together in a state of being spaced apart from the inner wall surface on the side of the stop, and the base is configured to be axially movable with respect to the power supply terminal. Even if there is thermal expansion on the side of the device to which the lamp is attached, the thermal expansion can be absorbed, and the lamp is not subjected to an undesired stress load.
In addition, by attaching and supporting the power supply terminal to the holder of the heating device in a state where the power supply terminal is in contact with the inner wall surface of the housing space on the power supply line side of the filament lamp, the axial direction of the lamp arc tube in the heating device can be reduced. A position can be maintained properly and precisely.

REFERENCE SIGNS LIST 1: filament lamp 2: arc tube 21: sealing portion 3: base 31: welding hole 32: terminal insertion hole 33: sealing portion insertion hole 34: housing space 34a: feeder side inner wall surface 34b: sealing portion side interior Wall surface 34c: Circumferential inner wall surface 35: Communication hole 4: External lead 5: Power supply line 6: Power supply terminal 8: Engagement projection 10: Holder (of heating device) X: Longitudinal axis of terminal insertion hole Y: Welding Through hole direction

Claims (5)

A lamp with a base, comprising: a filament lamp comprising an arc tube, a sealing portion provided at an end of the filament lamp, an external lead projecting from the sealing portion, and a base to which the sealing portion is fitted ,
A plate-shaped power supply terminal attached to a power supply line is accommodated inside the base, and an accommodation space is formed in which the power supply terminal and the external lead are joined,
A welding hole is provided through the base so as to pass through the accommodation space,
The base is provided with a terminal insertion hole through which the power supply terminal can be inserted into the accommodation space,
The power supply terminal rotates in the accommodation space and is held in the accommodation space. The power supply terminal is separated from the inner wall surface of the accommodation space on the sealing portion side in the axial direction of the filament lamp. The external lead and the power supply terminal are welded together so as to
A lamp with a base, wherein the base is configured to be axially movable with respect to the power supply terminal. 2. The lamp with a base according to claim 1, wherein an engagement projection is formed in said accommodation space for restricting the rotation range of said power supply terminal. The terminal insertion hole has a flat shape conforming to the shape of the terminal,
2. The lamp with a base according to claim 1, wherein the terminal insertion hole is formed such that its longitudinal axis is inclined with respect to the penetration direction of the welding hole. A heating device to which the lamp with a base according to any one of claims 1 to 3 is attached,
A receiving tool for attaching and supporting the base,
The heating device, wherein the base is attached to and supported by the receiver in a state in which the power supply terminal is separated from the inner wall surface of the housing space on the sealing portion side in the axial direction of the filament lamp. 5. The heating device according to claim 4, wherein the base is attached to and supported by the receiver while being in contact with an inner wall surface of the housing space on the power supply line side.

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