JPS6310610Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube-shaped light bulb used, for example, as a light source for illuminating a document in a copying machine.

Generally, in a copying machine, it is necessary to equalize the illuminance distribution of light on the photoreceptor in order to obtain a highly reproducible image of the original. It is necessary to form an illuminance distribution pattern in an elongated strip-shaped illumination area in which the illuminance at both ends is greater than the illuminance at the center.

For this reason, the light source is a tube-shaped light bulb equipped with a filament in which light-emitting parts and non-light-emitting parts are arranged alternately in the length direction, and the length of the end-side light-emitting part is larger than the length of the center-side light-emitting part. is used.

Recently, as research into photoreceptor materials has progressed, photosensitive layers with excellent photosensitivity have been developed. The height of the tube and its distribution pattern must be precisely adjusted, and therefore, it is necessary to use a tube-shaped light bulb whose luminous intensity distribution in the length direction is strictly regulated.

Conventionally, as shown in FIG. 1, a plurality of filament elements 10 each consisting of a tightly wound coiled light emitting part 11 and loosely wound coiled connecting parts 12, 12 continuing at both ends thereof, are used. As shown in FIG. 2, each of them is arranged so as to extend in a line along the tube axis P of the tubular enclosure 2 made of quartz. 12 includes a linear portion 31 having an outer diameter that matches the inner diameter of the connecting portions 12, 12,
The non-light-emitting part 13 is formed by inserting and connecting both ends of the straight part 31 of the short-circuiting core wire 3, which has bent parts 32, 32 bent at right angles integrally formed at both ends thereof. filament element 10
are electrically connected to each other, and a long filament 1 is constructed in which light-emitting parts 11 and non-light-emitting parts 13 are arranged alternately in the length direction. A ring-shaped supporter 33, 33 is integrally provided on each of the bent portions 32, 32 of each shorting core wire 3, and the outer periphery of the supporter 33, 33 is elastically attached to the inner wall 21 of the tubular enclosure 2. Due to the contact, each of the filament elements 10 is supported in position along the tube axis P of the tubular enclosure 2. The length of the light emitting part 11 in each filament element 10 is made larger toward the end of the filament 1, and internal leads 4,
4 are connected to each other, and these internal leads 4, 4 are connected to external leads 7, 7 via metal foils 6, 6 sealed within the sealing parts 5, 5.

By the way, the work of connecting each of the filament elements 10 with the shorting core wire 3 is specifically performed as follows. That is, the short-circuiting core wire 3 and the filament element 10 are held horizontally so as to be coaxial with each other by appropriate means, and then the short-circuiting core wire 3 is fixed and the filament element 10 is connected to the short-circuiting core wire 3.
so that the proximal end 321 of the bent part 32 of the shorting core wire 3 is positioned so as to face the open end L of the end coil gap of the connecting part 12 of the filament element 10. Then, for example, the connecting part 12 is screwed into the straight part 31 of the shorting core wire 3 so that the bent part 32 is relatively moved along the spiral coil gap of the connecting part 12, and the connecting part 12 is moved into the straight part. Connect to one side of 31. And on the other side of the straight part 31 of this shorting core wire 3,
Another filament element 10 is arranged so as to be coaxial with the shorting core wire 3, and this filament element 1
0 connection portion 12 is connected in the same manner as described above. In this way, one connecting portion 12, 12 of each of the two filament elements 10 connects to one short-circuiting core wire 3.
Connected by and filament element 10
Further, another short-circuiting core wire 3 and a filament element 10 are connected to the other connecting portions 12, 12 of each of the other connecting portions 12, 12 of
are connected alternately and sequentially in the same manner as described above to form a long filament 1.

In this way, in the work of connecting each of the filament elements 10 with the short-circuiting core wire 3, the bent portion 32 of the short-circuiting core wire 3 is connected so as to face the open end L of the end coil gap of the connecting portion 12 of the filament element 10.
It is necessary to position the base end 321 of the short-circuiting part 321 coaxially with the connecting part 12, and then start screwing the connecting part 12 from the bent part 32 of the short-circuiting core wire 3 to the straight part 31. In the conventional configuration described above, the opening width of the open end L of the upper end coil gap is small, and it is difficult to precisely align the short-circuiting core wire 3 and the connecting part 12 so that they are coaxial. Since the diameter is usually small, this connecting part 12
It is difficult to detect the position of the tip by optical means, and since the tip of the connecting portion 12 is located along the outer circumference of the coil of the connecting portion 12, the position of this tip cannot be detected mechanically. Since it is difficult to detect by any means, it is difficult to position the base end 321 so as to face the open end L of the end coil gap, and it takes a lot of labor and time. Therefore, a tube-shaped light bulb is advantageous. This results in high costs because it cannot be manufactured in a timely manner. Furthermore, as described above, it is difficult to detect the tip position of the connecting part 12, so it is difficult to specify the screwing length in the work of screwing the connecting part 12 into the straight part 31 of the short-circuiting core wire 3 with high accuracy. This makes it difficult to strictly control the length of the non-light-emitting portion, and as a result, it is not possible to strictly control the light emission amount distribution in the length direction.

The present invention was developed based on the above-mentioned circumstances, and has a simple configuration that makes it easy to connect each filament element with a shorting core wire.
In addition, the position of the connecting part of the filament element can be easily detected mechanically, and the threaded length of the connecting part can be determined with high precision, resulting in advantageous manufacturing and low cost. The object of the present invention is to provide a tube-shaped light bulb, and its features include a tube-shaped envelope and mutually adjacent tubes arranged within the tube-shaped envelope so as to extend along the tube axis of the tube-shaped envelope. A filament comprising a plurality of filament elements connected by a short-circuiting core wire, each filament element consisting of a coil-length light-emitting part and a coil-shaped connecting part continuing at both ends of the light-emitting part. Both ends of a short-circuiting core wire having bent portions at both ends are inserted into the mutually adjacent connecting portions of adjacent filament elements and connected, and the outer diameter of the connecting portion is connected to the tip of the connecting portion of the filament element. It has a protrusion extending in the direction.

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

In one embodiment of the present invention, as shown in FIG.
At the tip of each of the connecting portions 12, 12 of the filament element 10 consisting of
A protruding portion 14, 1 that protrudes outward from the outer diameter of 12.
4, and as shown in FIG. 4, a plurality of filament elements 10 each having a different length of the light emitting part 11 are arranged in the tube-shaped enclosure 2 made of, for example, quartz. The filament elements 1 are arranged so as to extend in a line along the tube axis P in order of increasing length.
The connecting portions 12, 12 adjacent to each other in the connecting portions 12, 12 are each provided with a straight portion 31 having an outer diameter that matches the inner diameter of the connecting portions 12, 12, and are bent at right angles integrally formed at both ends thereof. The non-light-emitting part 13 is formed by inserting and connecting both ends of the straight part 31 of the short-circuiting core wire 3 made of molybdenum, for example, having the bent parts 32, 32, and thus the filament element 1
0 are electrically connected to each other and the light emitting unit 11
and non-light emitting portions 13 constitute a long filament 1 in which the non-light emitting portions 13 are arranged alternately in the length direction. As shown in FIG. 5, each of the bent portions 32, 32 of each short-circuiting core wire 3 is provided with a ring-shaped supporter 33, 33 that extends integrally.
By bringing the outer periphery of the filament elements 10 into elastic contact with the inner wall 21 of the tubular enclosure 2, each of the filament elements 10 is supported at a position along the tube axis P of the tubular enclosure 2. Internal leads 4, 4 are connected to both ends of the filament 1.
are connected to external leads 7, 7 via metal foils 6, 6 sealed within the sealing parts 5, 5.

According to the above embodiment, in the work of connecting each of the filament elements 10 by the shorting core wire 3, the connecting portions 12, 12 of each filament element 10 are
Since protrusions 14, 14 are provided at the tips of each of the connecting portions 12, 12, the protruding portions 14, 14 projecting outward from the outer diameter of the connecting portions 12, 12 are provided. In addition to being clearly visible, by using each of the protrusions 14, 14 as a guide, even if the shorting core wire 3 and the connecting portion 12 are not precisely aligned, the proximal end portion 321 can be It can be easily entered so as to face the open end L of the end coil gap of the connecting part 12,
Next, the protrusion 1 is removed by screwing.
4 rotates in a large circle and also functions as a guide for screwing in, making connection work easier and reducing the effort and time required for work. This is especially noticeable when a large number of filament elements 10 are connected, and the filament manufacturing work can be greatly simplified, which ultimately makes it possible to advantageously manufacture tube-shaped light bulbs and reduce manufacturing costs. It becomes possible to achieve this goal. Since the protruding part 14 protrudes outward from the outer diameter of the connecting part 12, the position of the protruding part 14 can be detected by means of a mechanical sensor such as a pin or the like and bringing it into contact with the protruding part 14. Therefore, the proximal end 32 of the bent part 32 of the shorting core wire 3 is located at a position facing the open end L of the end coil gap of the connecting part 12.
A first sensor detects the position of the protruding part 14 at the tip of the connecting part 12 when the connecting part 1 is positioned, and a first sensor detects the position of the protruding part 14 at the tip of the connecting part 12 when the connecting part 12 is screwed into the straight part 31 of the shorting core wire 3. By providing a second sensor for detecting the position of the protruding portion 14 at the position where it should be, the screwing length of the connecting portion 12 can always be set to the specified screwing length with high accuracy. The length of the non-light-emitting portion 13 can be easily and reliably set to a desired length, making it possible to obtain a tube-shaped light bulb in which the distribution of light emission amount in the length direction of the filament 1 is strictly regulated.

In the above, the bent portions 32, 32 of the short-circuiting core wire 3
In the above, supports 33, 33 are integrally provided to support the filament element 10, but supports are separately provided to support the filament element 10, for example.
It may also be supported at appropriate locations. It is preferable that the length d of the protruding portion 14 protruding outward from the outer diameter of the connecting portion 12 is 0.5 mm or more.

Although one embodiment of the embodiment has been described above, the present invention has the following features:
Consisting of a tubular enclosure and a plurality of filament elements arranged within the tubular enclosure to extend along the tube axis of the tubular enclosure, adjacent filament elements connected by short-circuiting core wires. Each of the filament elements comprises a coiled light emitting part and a coiled connecting part continuous to both ends thereof, and the adjacent connecting parts of the adjacent filament elements have bends at both ends thereof. Both ends of the short-circuiting core wire having a section are inserted and connected, and the connecting section of the filament element has a protruding section extending outward from the outer diameter of the connecting section at the tip of the connecting section. With this configuration, it is easy to connect each filament element with a short-circuiting core wire, and the position of the connecting part of the filament element can be easily detected mechanically, so that the screwing length of the connecting part can be determined with high precision. As a result, it is possible to provide a tube-shaped light bulb that can be manufactured advantageously and at low cost.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a conventional filament element, Fig. 2 is an explanatory sectional view showing an example of a conventional tube-shaped light bulb, and Fig. 3 is an explanatory diagram showing an example of the filament element used in the tube-shaped light bulb of the present invention. The explanatory drawings shown in FIGS. 4 and 5 are an explanatory longitudinal front view and an explanatory longitudinal cross-sectional side view, respectively, showing one embodiment of the present invention. 11... Light emitting part, 12, 12... Connection part, 10
...Filament element, 2...Tubular enclosure, P...
Tube shaft, 3... Core wire for short circuit, 31... Straight portion, 3
2, 32... bending part, 33, 33... supporter,
21... Inner wall, 13... Non-light emitting part, 4, 4... Internal lead, 1... Filament, 6, 6... Metal foil, 5, 5... Sealing part, 14, 14... Projecting part.

Claims (1)

[Scope of utility model registration request] Consisting of a tubular enclosure and a plurality of filament elements arranged within the tubular enclosure to extend along the tube axis of the tubular enclosure, adjacent filament elements connected by short-circuiting core wires. Each of the filament elements comprises a coiled light emitting part and a coiled connecting part continuous to both ends thereof, and the adjacent connecting parts of the adjacent filament elements have bends at both ends thereof. A tubular light bulb characterized in that both ends of a short-circuiting core wire having a section are inserted and connected, and the connecting part of the filament element has a protruding part extending outward from the outer diameter of the connecting part at the tip of the connecting part.