JP5454417B2 - Filament lamp with base - Google Patents

Description

  The present invention relates to a filament lamp with a base, and more particularly to a filament lamp with a base formed by fixing the base to the filament lamp without using an adhesive such as cement.

Conventionally, in a filament lamp used as a heating light source for fixing toner in an image fixing apparatus such as a copying machine or a laser beam printer, a metal foil in a sealing portion at both ends, an internal lead at both ends of the filament, and an outside of the arc tube In general, a pinch seal is connected to the lead-out external lead.
Such a filament lamp is usually used with a base attached to pinch seal portions at both ends thereof, and a structure in which this base is attached without using an adhesive such as cement is known. For example, this is Utility Model Registration No. 2579042 (Patent Document 1).

The filament lamp 30 is formed with a sealing portion 32 made of a pinch seal at both ends of a long arc tube 31 made of quartz glass, and the filament 33 is arranged inside the arc tube 31 so as to coincide with the tube axis. Has been. A metal foil (not shown) is embedded in the seal portions 32 at both ends of the arc tube 31, and the internal lead 34 of the filament 33 and the external lead 35 led out of the arc tube are welded to each other. Etc. are connected.
A base 36 is fitted into the pinch seal portion 32. The base is a substantially cylindrical body made of, for example, ceramic, and a first opening 37 into which the seal portion 32 is inserted is formed on one end side, and a second opening 38 into which the power supply line 42 is inserted on the other end side. Has been.
A welding work hole 39 is formed at the center thereof, and the welding work hole 39 communicates with the second opening 38. Further, a partition wall 40 is formed between the welding work hole 39 and the first opening 37, and an external lead insertion port 41 is formed in the partition wall 40.

The seal portion 32 of the filament lamp 30 is inserted into the first opening 37 of the base 36. At this time, the external lead 35 led out from the seal portion 32 passes through the external lead insertion port 41 and enters the welding work hole 39. Protrusively up to.
On the other hand, a terminal 43 is fixed to the tip of the power supply line 42 by means such as crimping or welding, and when the power supply line 42 is inserted into the second opening 38, the terminal 43 at the tip of the terminal 43 is connected to the welding work hole. 39, where the external leads 35 overlap.
The external lead 35 and the terminal 43 are welded by an appropriate welding tool through the welding work hole 39.
At this time, the seal portion 32 and the terminal 43 are fixed so as to sandwich the partition wall 40 from both sides, whereby the base 36 is fixed to the seal portion 32.

By the way, in this conventional example, as described above, the seal portion 32 of the lamp 30 is inserted until it contacts the bottom portion of the first opening 37 of the base 36, and the partition wall 40 is sandwiched together with the terminals 43 in that state. Thus, the positional relationship between the base 36 and the lamp 30 is determined.
By the way, since the sealing part 32 by the pinch seal is formed by pressurizing the glass in a heated state, the manner of deformation of the glass at the time of pressurization varies depending on the individual glass tubes used as the material, and exceeds a certain level. Dimensional accuracy cannot be determined. For this reason, variations in length in the tube axis direction are unavoidably caused by individual glass tubes, and there is a problem that the distance between the bases 36 attached to the seal portions 32 at both ends also varies.
As described above, the total length of the lamp including the lamp 30 and the base 36 is influenced by the variation in the dimensional accuracy of the seal portion 32, so that an error cannot be avoided. As a result, when the lamp is mounted on the lamp, There has been a problem that the position of the light emitting section is displaced.

Utility Model Registration No. 2579042

  In view of the problems of the prior art, the present invention has a base fitted to a pinch seal portion of a filament lamp, and an external lead of the filament lamp is connected to a terminal in the base, and the terminal In a filament lamp with a base to which a power supply line is connected, a structure in which the axial movement of the base is regulated by engaging the terminal and the base, and the dimensional accuracy of the entire axial length of the lamp is improved. It is something to be offered.

In order to solve the above-described problems, in the present invention, a terminal side engaging portion is formed on a side surface of a terminal accommodated in a base fitted in a seal portion of a filament lamp, and the base insertion hole has a base side. An engaging portion is formed, and movement of the base in the axial direction is restricted by the terminal side engaging portion.
Further, the terminal side engaging portion is formed by a notch formed on a side surface of the terminal, the base side engaging portion is formed by a partition wall protruding from the inner surface of the insertion hole, and the terminal can pass through the partition wall. A gap is formed.
Further, the terminal side engaging portion is formed of a projecting piece protruding from a side surface of the terminal, the base side engaging portion is formed of a recess formed in the inner surface of the insertion hole, and the terminal passes through the inner surface of the insertion hole. A slit that can be formed is formed.

  According to the present invention, since the axial movement of the base is restricted by the engaging terminal side engaging portion, the axial position of the base relative to the lamp depends on the end of the lamp, which is a glass member. Compared to this, it is extremely improved. As a result, the entire length of the lamp including the base becomes constant, the dimensional accuracy is improved, and there is an effect that variations due to the lamp do not occur.

Sectional drawing of the edge part of the filament lamp with a base of this invention. Explanatory drawing of the assembly process of the Example of FIG. Explanatory drawing of the principal part in the assembly process of FIG. Explanatory drawing of the assembly process of another Example. FIG. 5 shows still another embodiment in the form of FIG. Explanatory drawing of final assembly work. Sectional drawing of the edge part of a prior art.

1A and 1B are cross-sectional views of an end portion of a filament lamp with a base according to the present invention, wherein FIG.
The base 5 fitted to the seal portion 2 of the filament lamp 1 is formed with insertion holes 6 penetrating at both ends thereof, the seal portion 2 of the filament lamp 1 from one end side, and the feeder 10 from the other end side. Is inserted.
The external lead 3 protruding from the seal portion 2 and the power supply line 10 are connected to the terminal 7 in the base 5. A notch 8 is formed on the side surface of the terminal 7 and engages with a pair of partition walls 11, 11 formed in the insertion hole 6 of the base 5. A gap 12 is formed between the partition walls 11 and 11 and can pass through the flat surface of the terminal 7 as will be described later.
As shown in FIG. 1B, a welding work hole 9 is formed in the base 5, and a welding tool is inserted into the welding work hole 9 for welding work between the terminal 7 and the external lead 3. It is done.

This assembly process will be described with reference to FIG.
As shown in FIGS. 2A and 2B, the insertion hole 6 of the base 5 is provided with a pair of partitions 11 and 11, and a gap 12 is formed between them.
A terminal 7 is connected to the power supply line 10 by crimping or welding, and is inserted into the base 5 in this state. At this time, the direction of the terminal 7 coincides with the direction of the gap 12 between the partition walls 11 and 11 of the base 5.
As a result, as shown in FIG. 2C, the terminal 7 passes between the partition walls 11 and 11 and is inserted until the notches 8 and 8 on both side surfaces thereof are located at locations where they coincide with the partition wall 11. The
When the feeder 10 is rotated at this position, the notch 8 of the terminal 7 is engaged with the partition wall 12 of the base 5. As a result, the base 5 is restricted from moving in the axial direction by the notch 8 of the terminal 7.

The operation will be described in more detail with reference to FIG.
FIG. 3 shows only the terminal 7 and the partition walls 11 and 11 taken out. In FIG. 3A, the direction of the gap 12 between the terminal 7 and the partition walls 11 and 11 is the same, and the terminal 7 is inserted through the gap 12 in this state.
Next, as shown in FIG. 3 (B), when the terminal 7 is rotated 90 ° at a position where the notch 8 of the terminal 7 and the partition wall 11 of the base coincide with each other, the notch 8 is formed on the partition wall 11. Engage. Of course, instead of rotating the terminal 7, the base 5 side may be rotated.

Referring to FIG. 2 again, FIG. 2 (F) is a cross-sectional view of FIG. 2 (D) rotated by 90 °, and is a cross-sectional view taken along the line AA of FIG. 2 (E).
With the terminal 7 and the partition wall 11 of the base 5 engaged as described above, the filament lamp seal portion 2 is inserted from the other end of the insertion hole 6 of the base 5 and is shown in FIG. Thus, the external lead 3 is made to overlap the terminal 7. In this state, the external lead 3 is welded to the terminal 7 through the welding work hole 9 shown in FIG.
In this way, the external lead 3 of the lamp is welded to the terminal 7 in a state in which the notch 8 of the terminal 7 and the partition wall 11 of the base 5 are engaged, so that the base 5 is axially moved by the terminal 7. The movement is restricted, and the positional relationship with the lamp is fixed at a predetermined position.

In the above embodiment, the terminal side engaging portion is the notch 8 of the terminal 7 and the base side engaging portion is the partition wall 11 provided on the inner surface of the insertion hole 6. An example is shown in FIG.
As shown in FIG. 4C, protrusions 14 and 14 are formed on both side surfaces of the terminal 7, and this constitutes a terminal side engaging portion. On the other hand, the insertion hole 6 of the base 5 is provided with a pair of protruding walls 15 and 16, and a recess 17 is formed between them, and this constitutes a base side engaging portion.
4A and 4B, a slit 18 through which the terminal 7 can pass is formed in one protruding wall 15 on the terminal 7 insertion side.

As shown in FIG. 4A, the feeder 10 having the terminal 7 connected to the tip is inserted into the insertion hole 6 of the base 5, and the protruding piece 14 of the terminal 7 at the tip passes through the slit 18, It is inserted until it is located in the recess 17.
Next, in this example, the base 5 side is rotated by 90 °. Thereby, the protruding piece 14 of the terminal 7 is engaged with the recess 17 of the base 5.
This state is shown in FIG. Next, the filament lamp seal portion 2 is inserted into the insertion hole 6 of the base 5 from the opposite side so that the external lead 3 overlaps the terminal 7.
FIG. 4C is a diagram obtained by rotating this FIG. 4C by 90 °, and the external lead 3 and the terminal 7 are welded through the welding work hole 9.

In addition, in the said Example, although the recess 17 which is a base side engaging part provided in a base is formed by a pair of protrusions 15 and 16, it forms in the inner surface itself of the penetration hole 6. An example is shown in FIG.
FIG. 5 shows only the base 5, (A) is a front view, and (B) is a side sectional view thereof. In the figure, a recess 17 is formed on the inner surface of the insertion hole 6. Is formed with a slit 19 extending from one end side, that is, an end where the feeder line and the terminal are inserted to the recess.
Although not shown in the figure, the terminal 7 attached to the tip of the feeder line is inserted into the insertion hole 6 through the slit 19 and reaches the recess 17.
Then, after that, either the feed line or the base is rotated to engage the projecting piece with the recess as in the example of FIG.

As shown in FIG. 6, the welding operation of the external lead and the terminal, which is the final step in the assembly process of the filament lamp with the base having the above-described configuration, is performed by using a welding jig to measure the axial dimension between the bases. Can be determined accurately.
The axial dimension required when the filament lamp with the base is mounted on the lamp is the dimensional accuracy between the bases attached to the lamp.
In FIG. 6, the assembled filament lamp with the base places the bases 5 and 5 at both ends in the grooves 21 and 21 of the welding jig 20. Then, for example, the step portion 5a of the base 5 is pressed against the end portion of the groove 21, and the dimension L between the step portions 5a and 5a is maintained at a predetermined size. In this state, the external lead 3 and the terminal 7 What is necessary is just to perform welding.
Of course, the stepped portion 5a is merely an example, and a location where dimensional accuracy in the base 5 is required may be a dimensional management target.

As described above, in the present invention, the terminal-side engagement portion is formed on the side surface of the terminal accommodated in the base fitted in the seal portion of the filament lamp, and the base-side engagement is formed in the insertion hole of the base. And the base is restricted from moving in the axial direction by the terminal side engaging portion, so that the positioning of the base does not depend on glass with poor dimensional accuracy, and the accurate axial dimension Accuracy has been realized.
In addition, the base and the terminal can be engaged simply by turning either of them by 90 °, and the operation is extremely simple.

DESCRIPTION OF SYMBOLS 1 Filament lamp 2 Seal part 3 External lead 5 Base 6 Insertion hole 7 Terminal 8 Notch (terminal side engaging part)
9 Welding hole 10 Feed line 11 Partition wall (base side engaging part)
12 Clearance 15 Projection piece (terminal side engagement part)
16, 17 Protruding wall 18 Recess (base side engaging portion)
19 Slit 20 Welding jig 21 Groove

Claims (4)

A filament lamp in which an external lead protrudes from the seal portion at the end of the arc tube, and a base fitted to the seal portion of the filament lamp, and the external lead is connected to a terminal in the base, and In a filament lamp with a base in which a power supply line is connected to the terminal,
A terminal side engaging portion is formed on the side surface of the terminal, a base side engaging portion is formed in the insertion hole of the base, and the base is restricted from moving in the axial direction by the terminal side engaging portion. A filament lamp with a base.   The terminal side engaging portion is formed of a notch formed on a side surface of the terminal, the base side engaging portion is formed of a partition wall protruding from the inner surface of the insertion hole, and the partition wall has a gap through which the terminal can pass. 2. The filament lamp with a base according to claim 1, wherein the filament lamp is formed. The terminal-side engaging portion is made of a projecting piece protruding from a side surface of the terminal, the base-side engaging portion is made of a recess formed on the inner surface of the insertion hole, and the slit through which the terminal can pass is inserted into the inner surface of the insertion hole. The filament lamp with a base according to claim 1, wherein:
4. The filament lamp with a base according to claim 2, wherein the terminal side engaging portion and the base side engaging portion are engaged with each other by rotating relative to each other at the engaging position.

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