JPH057730Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Industrial application field) The invention is a double-end molded tube in which an insulating base is connected to the pinch seals formed at both ends of a bulb, such as in an infrared lamp. Regarding a shaped light bulb device.

(Prior art) For example, in the fixing roller of a copying machine,
An infrared lamp is housed to heat this roller.

This type of infrared lamp has filaments arranged at intervals in the axial direction of the tube inside a long tube-shaped bulb made of infrared-transmissive glass. A base made of a ceramic insulator such as steatite is bonded.

The base has a fitting groove formed at one end thereof into which the pinch seal part fits, and is joined to the pinch seal part by an adhesive, that is, base cement, filled in this fitting groove. A power supply line made of a coated cord electrically connected to the filament in the bulb is led out from the other end of the base.

When such a double-ended infrared lamp is accommodated and held within the fixing roller, a means is employed for holding the bases at both ends between supports.

(Problem that the invention attempts to solve) However, the conventional base is cylindrical,
Even when this outer surface was sandwiched between supports, it was easy to rotate around the tube axis. For this reason, the lamp may rotate around the tube axis due to vibration or impact, and if the center line of the base and the center line of the filament are inconsistent, this rotation may cause changes in the orientation characteristics. There are problems such as twisting the power supply line.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to provide a double-ended metal tube type light bulb device in which the lamp does not rotate or move in the axial direction and is securely supported. do.

[Structure of the invention] (Means for solving the problem) The structure of the invention is such that the base joined to the end of the valve has a pair of flat surfaces opposite to each other on the outer surface of one end, and The surface is tapered so that the one end side is lower, and the support for supporting the base is approximately U-shaped with a pair of opposing side walls, and one side wall is formed with an insertion hole through which the cylindrical portion of the base is passed. At the same time, the other side wall is provided with a notched groove into which the tapered surface is fitted.

(Function) According to the above configuration, the tapered surface formed on the base is fitted into the notch groove of the other side wall formed on the support, so that rotation of the base is prevented. In addition, since this surface is a tapered surface, if it moves relative to the support in the axial direction, it will be locked to the support at a predetermined position, preventing further movement, thus preventing axial movement. be done.

(Example) The present invention will be described below based on an example shown in the drawings.

FIG. 9 shows an infrared lamp for heating the fixing roller of a copying machine, and numeral 1 is a tube-shaped bulb made of infrared transmitting glass such as quartz. This valve 1
is pinch-sealed at both ends, and these pinch-sealed portions 2, 2 are provided with a known Mo
The foil conductor is sealed. Inside the valve 1, a plurality of filaments 3 are provided at intervals along the tube axis, and these filaments 3 are supported so as to be positioned on the tube axis by known ring anchors (not shown). ing. The filament 3 is connected to the Mo foil conductor in the pinch seal parts 2, 2, and this Mo foil conductor is connected to an external lead wire (not shown), and this external lead wire is connected to the end face of the pinch seal parts 2, 2. It has been derived.

Bases 5, 5 are joined to the pinch seal parts 2, 2, respectively.

Although the joint structure of the base 5 is shown in FIGS. 1 to 3, the structure of the base 5 itself will first be explained based on FIGS. 4 to 8.

The base 5 is made of a ceramic insulator such as steatite, and has a cylindrical large diameter portion 6 and a cylindrical small diameter portion 7 continuous in the axial direction. A fitting groove 8 is formed in the cylindrical large diameter portion 6 and is open across one end surface and both side surfaces, and the pinch seal portion 2 is fitted into the fitting groove 8.

The cylindrical small diameter portion 7 is formed with a through hole 9 that communicates with the fitting groove 8 and the other end surface of the cylindrical small diameter portion 7 along the axial direction.

The cylindrical large-diameter portion 6 has flat portions 10, 10 formed on its side surface at positions orthogonal to the opening of the fitting groove 8 and oriented with respect to each other. These flat portions 10, 10 are formed into tapered surfaces that taper toward one end of the cylindrical large diameter portion 6, and have flange portions 11, 11 at the other end.

The side surface of the cylindrical large diameter portion 6 where the fitting groove 8 opens is formed with cut surfaces 12, 12 in the extension direction of this opening portion.

The base 5 having such a structure is constructed by filling the fitting groove 8 with an adhesive, that is, the base cement 14, and fitting the end of the pinch seal portion 2 into the fitting groove 8, thereby attaching the base cement 14. It is joined to the pinch seal portion 2 via the pinch seal portion 2.

In this case, a power supply line 15 made of a coated cord is electrically connected to an external lead wire (not shown) led out from the end face of the pinch seal part 2, and this power supply line 15 is conducted through the conduction hole 9 of the cylindrical small diameter part 7. Bring it out. When the base 5 is placed over the pinch seal portion 2, the connecting portion between the external lead wire and the power supply line 15 is accommodated in the fitting groove 8, and is covered by the base cement 14 filled in the fitting groove 8. It is becoming more and more popular.

When such base cement 14 hardens,
The base cement 14 joins the base 5 and the pinch seal portion 2 of the valve 1 to each other.

Note that the base 5 of the above embodiment has a dimension m smaller than the width dimension l of the pinch seal portion 2 shown in FIG.
The cut surfaces 12, 12 described above are effective in obtaining this small dimension m.

The above-mentioned infrared lamp is housed in a fixing roller of a copying machine (not shown) and heats the fixing roller, and is held within the roller by a support 20 shown in FIG. 1.

The support 20 of this embodiment is approximately U-shaped as shown in FIG. 1, and has a U-shaped groove 22 in one side wall 21 and an insertion hole 2 in the other side wall 23.
It has 4.

The cylindrical large diameter part 6 of the base 5 is inserted into the U-shaped groove 22, in which case the flat surface 10,
10 is sandwiched between them.

Further, the cylindrical small diameter portion 7 is inserted into the insertion hole 24, and in this case, as shown in FIG.
The side wall formed with .

In addition, when the support 20 is to be locked to the base 5, the axis of the insertion hole 24 of the support 20 is at an angle to the axis of the valve 1, and the cylindrical small diameter portion 7 of the base 5 is inserted into the insertion hole 24. Insert. At this time, the walls 22a, 22b of the support 20 face the tapered flat surfaces 10, 10 beyond the flange portion 11. In this state, if the support 20 is rotated about the engagement part with the cylindrical small diameter part 7 so that the axis of the insertion hole 24 coincides with the axis of the valve 1, the walls 22a, 22b of the support 20 can be rotated. is fitted into the tapered flat surfaces 10, 10, that is, the tapered flat surfaces 10, 10 are fitted into the U-shaped groove 22.

Therefore, when the support 20 supports the base 5, the flat surfaces 10, 10 of the base 5 are held between the walls 22a, 22b of the U-shaped groove 22, so that the rotation of the base 5, that is, the tube of the lamp is prevented. Rotation around the axis is prevented. Moreover, the walls 22a, 2 of the U-shaped groove 22
2b sandwiches the tapered flat surfaces 10, 10, and the side wall 23 in which the insertion hole 24 is formed hits the step between the cylindrical small diameter part 7 and the large diameter part 6.
These walls 22a, 22b and side wall 23 prevent the lamp from moving in the axial direction.

For this reason, the lamp is positioned within the fixing roller with high precision both in the direction of rotation around the tube axis and in the tube axis direction.

Incidentally, since the dimension m of the large diameter portion 6 of the base 5 is made smaller than the width dimension l of the pinch seal portion 2, the radial size of the entire lamp can be reduced. That is, when the dimension m is larger than l, the base 5 protrudes beyond the width of the pinch seal portion 2, and the diameter of the entire lamp increases. For this reason,
When housed in the fixing roller, there is a problem in that it interferes with other parts around it. Especially the dimension m
When is larger than l, the base cement 14 protrudes beyond the dimension m, which causes the diameter of the entire lamp to increase.

On the other hand, if the dimension m is smaller than l, the diameter of the entire lamp can be reduced, and even if the base cement 14 slightly protrudes from the base 5, it will not protrude beyond the width of the pinch seal part 2. , therefore the base cement 14
You no longer have to worry about paying attention to the filling.

In particular, forming the cut surfaces 12, 12 contributes to reducing the above-mentioned dimension m, and is effective in preventing the base cement 14 from protruding in the width direction of the pinch seal portion 2.

Further, since the base 5 is formed with flat surfaces 10, 10, when attaching the base 5 to the valve 1, these flat surfaces 10, 10 can be held between the chuck 30 as shown in FIG. In this case as well, the base 5 can be positioned around the axis.
Positioning between the base 5 and the pinch seal portion 2 of the valve 1 can be performed with high precision. That is, when the pinch seal part 2 is fitted into the fitting groove 8 of the base 5, if the base 5 and the pinch seal part 2 are fitted in an inclined manner as shown by the imaginary line in FIG.
There is a difference in the amount of base cement 14 filled between both sides of the pinch seal part 2 and the inner surface of the fitting groove 8, and as a result, thermal expansion of the base cement 14 causes a larger expansion on the thicker side, resulting in a decrease in the thickness. When a pressing force is applied to the thinner side and such stress is repeated, the base cement 14 may peel off.

In contrast, according to the present invention, since the base 5 can be positioned by the flat surfaces 10, 10 of the base 5, the gap between the base 5 and the pinch seal portion 2 can be set evenly.

Further, in the above embodiment, an infrared lamp for a copying machine was explained, but the present invention is not limited to this, and the object of use is not limited to copying machines, and the lamp is not limited to infrared lamps only, but also halogen lamps. It may also be an arc tube bulb of a discharge lamp.

[Effects of the invention] As explained above, according to the invention, a pair of tapered flat surfaces are formed on the base attached to the valve,
Since these tapered flat surfaces are engaged with notched grooves formed in the support, the lamp is prevented from rotating around the tube axis. Since the lamp engages with the formed cutout groove and the insertion hole, relative movement of the lamp in the axial direction is also prevented. Therefore, the lamp can be positioned with high precision by the support.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a perspective view of the main parts, FIG. 2 being a side view, and FIG. 3 being a plan view.
Figures 4 to 8 show the base, Figure 4 is a top view, Figure 5 is a front view, Figure 6 is a side view, Figure 7 is a bottom view, Figure 8 is a sectional view, and Figure 9. 1 is a perspective view showing the entire lamp, and FIG. 10 is an explanatory view of the assembled state. 1... Valve, 2... Pinch seal section, 5...
Base, 8... Fitting groove, 9... Conduction hole, 10...
Flat surface, 11... Flange portion, 14... Base cement, 15... Power supply line, 20... Support, 7...
... Cylindrical small diameter part, 21, 23 ... Side wall of support,
22...U-shaped groove, 24...insertion hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A tube-shaped light bulb with pinch seals formed at both ends of the tube-shaped bulb, and a fitting groove in which the pinch seals fit into one end, and this end is connected to the above-mentioned tube through an adhesive. A double-ended mold comprising: an insulating base that is joined to the pinch seal part and has a cylindrical part formed at the other end; a power supply line led out from the cylindrical part of the base; and a support that supports the base. In the tube-type light bulb device, the base has a pair of flat surfaces facing away from each other on the outer surface of the one end side, and these flat surfaces are tapered surfaces that are lower on the one end side, and the support device has a pair of flat surfaces facing each other. It is characterized in that it has a U-shape with side walls, one side wall is formed with an insertion hole through which the cylindrical portion is passed, and the other side wall is provided with a groove into which the tapered surface is fitted. Double-ended mold tube type light bulb device.