JPS61230254A - Tubular electric lamp - Google Patents

Abstract

PURPOSE:To improve the shock resistance of a tubular electric lamp by specifying the dimensions of the flat end of nonluminous parts each consisting of a short bar and a ring anchor and attaching and welding the nonluminous coil of the filament to the flat end. CONSTITUTION:A tubular electric lamp for exposure used in a copying device is produced by stretching a filament 2, formed by serially connecting several emitter coils 3 and several nonluminous parts 4, along the central axis of a tubular bulb 1. The nonluminous part 4 consists of a short bar and a ring anchor 12 and has a flat end 11. The maximum width (d) of the flat end 11 and the inner diameter (D) of nonluminous coils 10 are adjusted according to the formula 0<=d-D<=0.02. The emitter coil 3 is connected to the nonluminous part 4 by attaching the nonluminous coil 10, connected to the emitter coil 3 through a connection 8, around the flat end 11 and then welding the coil 10 and the flat end 11 together. Due to the above structure, it is possible to stably maintain the amount of emission even while vibration being applied to the lamp without causing the coil 10 to detach from the end 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tube-shaped light bulb, and more particularly to a tube-shaped light bulb for exposure of a copying machine.

Conventional technology Conventionally, in order to make the illuminance distribution uniform in the direction of the tube axis in tube-shaped light bulbs for copying machines, the light-emitting part of the filament was divided into multiple parts, and the multiple light-emitting part coils were connected to multiple sheet bars and anchors. It is known that the structure is short-circuited by a non-luminous body made of a conductor (Japanese Actual Publication Act, 1973).
(See Publication No. 3-53330). Figure 6 is a front view of a conventional tube light bulb for copying machines, and Figure 6 shows the connection between the filament coil and the non-luminous body made of a conductor in which the seat bar and anchor of this tube light bulb are integrated. It is a front view which expands and shows a part. A filament 2 is stretched around the central axis of a tubular bulb 1 made of quartz glass. In the filament, a plurality of light-emitting coils 3 and non-light-emitting bodies 4 are connected in series.

The end of the filament 2 is connected to one end of a molybdenum foil 6, and the molybdenum foil 6 is hermetically sealed at the end of the tubular bulb 1 to form a sealing portion 6.

The conventional connection between the light-emitting coil 3 and the non-light-emitting body 4 is as shown in FIG. Tip part 1
1, and connect the non-light emitting part coil 1o and the tip part 1 of the non-light emitting body.
1 and were welded together using a resistance welder.

Problems to be Solved by the Invention As mentioned above, in conventional tube-shaped light bulbs, in order to improve workability when inserting and welding the non-luminous end portion 11 into the non-luminescent coil 1o, Body tip 11
The outer diameter of the non-light emitting part coil 10 is 10 to 30
It is made smaller by microns. When the tip 11 of the non-luminous body and the non-luminous coil 10 are welded using a resistance welding machine, as shown in FIG. Although the coil 1o is welded, in other parts, the non-light-emitting part coil 1o does not come into close contact with the tip part 11 of the non-light-emitting body, and is in a floating state. When a current is passed through such a light bulb, the turn 14 of the non-light-emitting coil 1o near the light-emitting coil 3 emits light, but when vibration is applied to the light bulb at this time, the turn 14 that was emitting light becomes a non-light-emitting body. If it comes into contact with the tip 11 of the blade, it may float. When the filament 2 is in contact, the resistance of the filament 2 decreases and more current flows, increasing the amount of light emitted from the light emitting coil 3. Conversely, when the filament 2 is floating, the amount of light decreases, resulting in the amount of light emitted from the light emitting section. The problem was that it became unstable.

The present invention has been made to solve these problems, and provides a tube-shaped light bulb that prevents the amount of light from becoming unstable even when vibrations are applied.

Means for Solving the Problem In order to solve this problem, the present invention provides that the non-luminous part of the filament is made of a non-luminous body in which a short bar and a ring anchor are integrated, and that at least the tip of the non-luminous body The maximum width of this flat part is d (m
m) has a relationship of 0≦d−D≦0.02 with respect to the inner diameter D (mm) of the coil.

Effect: With this configuration, even when welding the non-light-emitting part coil and the flat tip of the non-light-emitting body, a part of the non-light-emitting part coil will not be lifted up, and even if the light bulb is subjected to vibrations while being lit, it will not lift up. It is possible to prevent the amount of light emitted from the light emitting section from becoming unstable.

Embodiment FIG. 1 is a perspective view of a non-luminous body in which a short bar and a ring anchor are integrated in a tube-shaped light bulb according to an embodiment of the present invention, and FIG. 2 is a front view of one end of the non-luminous body. FIG. 3 is a side sectional view of the flat tip of the non-light-emitting body 16. For example, rated voltage 80V, output 220W, efficiency 2
01 m/'W (D In the case of a tube-shaped light bulb for copying machines, the wire diameter of the filament coil arranged along the tube axis inside the tube-shaped glass bulb is Q, 13 + mn, and the inner diameter of the coil is 0.
．． 45mm, pitch 0.2cm. As shown in FIG. 3, a molybdenum rod with a flat cross-section at the tip and a maximum width d of 0.46 m is used as the non-luminous body 15 in which the short bar and ring anchor 12 are integrated for this coil. there was. At this time, the flat tip 16 shown in FIG.
The length A was 4.0 moromi.

When inserting the flat tip 16 of the non-light-emitting body 15 from the end of the non-light-emitting coil 10, since the maximum width of the flat tip 16 of the non-light-emitting body 15 is smaller than the inner diameter of the non-light-emitting coil 10, They cannot be inserted just by pressing them together. Therefore, the non-light emitting body 15 is
When rotated and pressed against each other, the non-light emitting part coil 1
Since the inner diameter of the coil 0 was widened, the flat tip 16 of the non-light emitting body 16 could be inserted into the non-light emitting coil 10. Since the flat tip 16 of the non-luminescent body 15 inserted in this way is in reliable contact with the non-luminescent coil 1o, the amount of light will not become unstable even if vibration is applied to the bulb while the bulb is on. There was no. A similar effect was obtained even when the maximum width of the flat tip 16 of the non-light-emitting body 15 was the same as the inner diameter of the non-light-emitting coil 1o;
．． Similar effects were not obtained when 01+o+ was small. In addition, if the maximum diameter of the flat tip 16 of the non-light emitting body 16 is larger than the inner diameter of the non-light emitting coil 10 by 0.02+++m, the flat tip 16 of the non-light emitting body 16 is inserted into the non-light emitting coil 10. However, it was very difficult to insert the one that was 0.03 mm larger. Although other types were also considered, the flat tip 16 of the non-luminous body 15
Workability was best when the maximum width d was equal to or 0.01 + o + larger than the inner diameter of the non-light emitting part coil 10. Note that, unlike the present invention, the non-light emitting part has a short bar and a ring anchor integrated. When the tip of the non-luminous body is not flat but a round bar, the tip of the non-luminous body having the same or thicker inner diameter as the non-luminescent coil cannot be inserted into the non-luminescent coil.

As described in detail, according to the present invention, the tip of the non-luminous body in which the short bar and the ring anchor are integrated is flat, so that the inner diameter is equal to or equal to the inner diameter of the non-luminescent coil. The flat part of the tip of the non-light-emitting body, which has a maximum diameter 0.02 m larger than that of the non-light-emitting body, can be inserted into the non-light-emitting body coil, so that some turns of the non-light-emitting body coil are lifted up from the tip of the non-light-emitting body. It is possible to provide a tube-shaped light bulb that emits light when energized and can prevent the occurrence of a phenomenon in which the amount of light emitted becomes unstable when vibration is applied to the light bulb.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a non-luminous body in which a short bar and a ring anchor are integrated in a tube-shaped light bulb according to an embodiment of the present invention, Fig. 2 is a front view of the main parts of the non-luminous body, and Fig. 3 4 is a side sectional view of the flat part of the non-luminous body, FIG. 4 is a side sectional view showing the flat part inserted into the non-luminescent coil, and FIG. 5 is a front view of a conventional tube light bulb for copying machines. , FIG. 6 is a front view showing the state of connection between the filament coil and the tip of the non-luminous body of the tube-shaped light bulb, and FIG. 7 is an enlarged sectional view of FIG. 6. 1o...Non-light-emitting part coil, 12...Lingua/car, 16...Non-light-emitting body, 16...
...Tip. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5

Claims (1)

[Claims] A tube-shaped bulb has a filament disposed in the tube axis direction, a light-emitting part and a non-light-emitting part are formed in the filament, and the non-light-emitting part has a short bar and a ring anchor. At least the tip of the non-luminous body is flat, and the maximum width d (mm) of this flat portion is 0≦d with respect to the inner diameter D (mm) of the coil. A tube-shaped light bulb characterized by the relationship: -D≦0.02.