JPS6323877Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a filament supporter for a tube-type light bulb.

For example, in the document illumination device of a copying machine, a tube-type light bulb called a partial emission type is used, in which a plurality of light-emitting filaments are arranged at intervals corresponding to the light distribution pattern to be formed on the document table. .

In this type of tube-type light bulb, it is necessary that the position of each light-emitting filament not be displaced from the tube axis of the envelope so that a predetermined light distribution pattern is always formed on the document table. For this reason, in a conventional tube-type light bulb, for example, as shown in FIG. A filament assembly F is constructed by welding the end portions together by spot welding, and then the filament assembly F is positioned within the envelope 7 and the large diameter portion of the spiral wound wire S is attached to the envelope 7. The filament assembly F was supported by the envelope 7 by pressure contact.

On the other hand, in recent years, copying machines have become smaller due to the production of highly sensitive photoreceptors and efforts to reduce power consumption.
Along with this, tube-type light bulbs are being made smaller.

However, when tube-type light bulbs are made smaller in size, the following problems arise.
That is, in the tube-type light bulb having the above structure, it is difficult to precisely align the shape of the spiral winding wire S constituting the supporter, and this becomes even more difficult as the spiral winding wire S becomes smaller, and the light-emitting filament 6 is short-circuited. When welding the filament assembly F by spot welding, the light emitting filament 6 and the shorting core wire 5 are not connected in a straight line but are connected in a bent state due to the impact force during welding. For example, when the light emitting filament 6 is positioned within the body 7, the luminous filament 6 is within ±0.5 mm from the tube axis of the envelope 7.
Although some degree of displacement is unavoidable, as tube-type light bulbs become smaller and the light-emitting filament 6 becomes smaller, the light distribution pattern on the document table can be changed to the required one due to the displacement of the light-emitting filament 6 of about ±0.5 mm. This results in a considerably different light distribution pattern. As tube-type light bulbs become smaller and consume less power, the temperature of the tube wall of the envelope 7 decreases, and for this reason, for example, in tube-type light bulbs filled with halogen gas, the halogen cycle is not sufficiently carried out. As a result, the tube wall of the enclosure 7 becomes blackened, and as a result, a long service life cannot be obtained. Here, it is possible to use an enclosure with a small diameter to maintain the temperature of the tube wall of the enclosure at a high temperature, but such a method would reduce the strength of the enclosure and also make the exhaust pipe thinner. This makes it difficult to exhaust the inside of the enclosure, which is ultimately impractical.

The present invention was developed against this background, and aims to make it possible to align the light-emitting filament with the tube axis of the envelope with high precision, and to extend the usable life of the tube-type light bulb. The purpose of the present invention is to provide a filament supporter for a tube-shaped light bulb, which is characterized by a cylindrical body made of ceramic having at least a part of it an outer diameter that matches the inner diameter of a tube-shaped envelope; A connection hole extending from the outer peripheral surface of the cylindrical body through the cylindrical wall of the cylindrical body to the cylindrical hole, and a receiving hole formed so as to be located on an extension of the connection hole through the cylindrical hole. The present invention is constructed by forming a locking portion consisting of a hole.

Embodiments of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention, as shown in FIGS. 2 and 3, there is provided a first cylindrical portion 1 having an outer diameter that matches the inner diameter of the enclosure to be used, and an end of this first cylindrical portion 1. It consists of a second cylindrical part 2 which is integrally connected so that their axes coincide with each other and has an outer diameter smaller than the outer diameter of the first cylindrical part 1, and whose diameter is smaller than the outer diameter of the short-circuited core wire to be used. Also, a cylinder 10 having a slightly larger cylinder hole 3 in the center is provided with a cylinder extending from the outer peripheral surface of the second cylinder part 2 at right angles to the axis of the second cylinder part 2 and penetrating the cylinder wall. A connection hole 4 that reaches the hole 3, and a receiving hole 40 formed on the extension of the connection hole 4 through the cylindrical hole 3. A filament supporter (hereinafter simply referred to as "supporter") 10 for a tube-type light bulb is formed with a locking part 41 consisting of a receiving hole 40 extending as shown in FIG.
Configure 0. To explain an example of a tube-type light bulb configured using this supporter 100, as shown in FIG. While making the tip 511 protrude from the first cylindrical portion 1 side, the one end 61 of the coiled light emitting filament 6 is inserted into the cylindrical hole 3 of the supporter 100, 100A.
Insert the short-circuited core wire 5 in a wound state from the first cylindrical part 1 side to make the tip 611 protrude to the second cylindrical part 2 side, and then insert the pressing rod from the connection hole 4, It is located within the cylindrical hole 3. By pushing a part of the short-circuited core wire 5 wound around the light-emitting filament 6 into the receiving hole 40, the short-circuited core wire 5 and the light-emitting filament 6 are deformed, and the short-circuited core wire 5 and the light-emitting filament 6 are deformed.
That is, they are connected to each other while being locked by the locking portion 41. and the fourth supporter 100, 100A.
On the right side of the figure, a separate supporter 100 with a similar configuration,
100B are provided at a distance such that the respective first cylindrical parts 1 face each other and the axes of the respective cylindrical bodies 10 coincide with each other, and the supports 100, 100
Regarding B, the other end 52 of the short-circuited core wire 5 is connected to the supporter 1 as in the case of the supports 100 and 100A.
It is inserted into the cylindrical hole 3 of 00, 100B from the second cylindrical part 2 side, and the one end 61 is connected to the supporter 100,
The other end 62 of the light emitting filament 6 supported by the supporter 100A is inserted into the cylindrical hole 3 of the
The short-circuit core wire 5 and the light-emitting filament 6 are connected to each other in a state in which they are locked in the locking portion 41 by inserting the short-circuit core wire 5 and the light emitting filament 6 into the locking portion 41 from the first cylindrical portion 1 side. and the supporter 10
Similar supports are separately provided on the left side of 0,100A in FIG. 100B, similar separately coated supports are provided on the right side in FIG. The condition shown in FIG. 4 is that the short-circuit core wire 5 and the light emitting filament 6 are placed between each of the plurality of supporters 100 in which the first cylindrical portion 1 is arranged alternately on the left side and the right side. As shown in FIG. This mount assembly M is positioned within the tube-shaped enclosure 7 so as to extend along the tube axis, the supporter 100 is supported by the inner periphery of the enclosure 7, and the metal By embedding the foil 81 in the sealing portion 71 of the envelope 7, a tube-type light bulb is constructed.

According to the supporter 100 having the above configuration, since the outer diameter of a part of the supporter 100 matches the inner diameter of the enclosure 7, the supporter 100 is supported by the inner circumference of the enclosure 7, and the short-circuit core wire Since the light-emitting filament 5 and the light-emitting filament 6 are respectively locked by the locking portions 41 in the supporter 100, the light-emitting filament 6 can be supported by the sealing body 7 via the supporter 100. Since the supporter 100 is made of ceramic, it can be molded into a mold and the shape can be easily made even for small ones. It is pressed by the inserted pressing rod and locked in the locking part 41, but when pressed, the portions located on both sides of the connection hole 4 of the short-circuit core wire 5 and the light emitting filament 6 are cylindrical. Since the filament 6 is pressed by the inner wall of the hole 3 and connected in a straight line without bending, the light emitting filament 6 can be aligned with the tube axis of the envelope 7 with high accuracy. By incorporating a light bulb into, for example, an original lighting device, the light distribution pattern on the original table can be made to match a desired light distribution pattern with high accuracy. Here, in order to increase the holding effect of the short-circuited core wire 5 and the light-emitting filament 6 by the inner wall of the cylindrical hole 3, it is preferable to increase the length of the supporter 100, but since the supporter 100 is made of ceramic, it is lightweight. However, its length can be increased. These connections can be made by inserting a pressing rod into the connection hole 4 of the supporter 100 and pressing the short-circuit core wire 5 and the light emitting filament 6. This makes the connection work easy, and as a result, the tube type Even if the light bulb becomes smaller, the mount assembly M
The assembly work becomes easier. Moreover, since the space where the short-circuit core wire 5 is located and the space where the light emitting filament 6 is located are partitioned by the supporter 100, no convection of the filled gas occurs between these spaces.The upper supporter 100 is made of ceramic. Since the tube wall of the envelope 7 surrounding the light-emitting filament 6 becomes high, the halogen cycle is sufficiently carried out in a tube-type light bulb filled with halogen gas. Therefore, the progress of blackening of the tube wall of the envelope 7 can be suppressed, and as a result, the service life of the tube-type light bulb can be extended.

Here, when supporting the supporter 100 on the enclosure 7, the supporter 100 is
The tube wall portions 72, 72 of the envelope 7 located on both sides of the first cylindrical portion 1 may be narrowed to form a small diameter portion. Displacement can be reliably prevented.

In order to connect the short-circuit core wire 5 and the light emitting filament 6 to each other, spot welding may be used instead of using a pressing rod.

Next, a modification of the supporter 100 will be described. The supporter 100 may be configured as follows.

(a) As shown in FIG. 7, a first cylinder having an outer diameter matching the inner diameter of the enclosure 7 is placed on both sides of a second cylinder part 2 having an outer diameter smaller than the inner diameter of the enclosure 7 to be used. A configuration in which each part 1 is provided.

(b) As shown in FIG. 8, a configuration using a cylindrical body 10 whose outer periphery matches the inner diameter of the enclosure 7 to be used.

C. As shown in FIG. 9, the receiving hole 40 constituting the locking portion 41 does not penetrate from the cylindrical hole 3 to the outer circumferential surface of the cylindrical body 10.

As described above, the present invention provides a filament supporter for a tube-type light bulb that can align the light-emitting filament with the tube axis of the envelope with high precision and also extend the service life of the tube-type light bulb. can be provided.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing a part of a conventional tube-type light bulb.
FIGS. 2 and 3 are a perspective view and a vertical side view showing a supporter according to an embodiment of the present invention, respectively, and FIG. 4 is an example of a tube-type light bulb to which a supporter according to an embodiment of the present invention is applied. FIG. 5 is a vertical side view showing the above-mentioned tube-type light bulb, and FIG. 6 is a part of another example of the tube-type light bulb to which the supporter according to the embodiment of the present invention is applied. The explanatory drawings and FIGS. 7 to 9 are longitudinal sectional side views showing supports according to other embodiments of the present invention. 1...First cylindrical part, 2...Second cylindrical part, 10...
... Cylindrical body, 3 ... Cylindrical hole, 4 ... Connection work hole, 4
0... Receiving hole, 41... Locking part, 100... Supporter, 5... Short-circuit core wire, 6... Light emitting filament, 7... Sealing body, 71... Sealing part, 72... Tube wall part, 8... Internal lead rod, 81... Metal foil, 8
2...External lead rod.

Claims (1)

[Scope of utility model registration request] A cylindrical body made of ceramic having at least a portion of the outer diameter that matches the inner diameter of the tubular enclosure, penetrates from the outer peripheral surface of the cylindrical body through the cylindrical wall of the cylindrical body to reach the cylindrical hole. A filament for a tube-type light bulb, characterized in that it is configured by forming a hole for connection work, and a locking part consisting of a receiving hole formed so as to be located on an extension of the hole for connection work through the cylindrical hole. Supporter.