JP2001196027A - Inner-electrode discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner-electrode discharge lamp that can easily and securely attain electrical connection of electrode films and a pair of power supply pins disposed at the end of the vessel. SOLUTION: In this inner-electrode discharge lamp, a pair of electrode films are disposed so as to face each other along the tube axis on inner wall of the glass tube forming the discharge vessel, and a pinch-seal portion is formed at an end of the said glass tube. In this pinch-seal portion, an end of each electrode film is connected electrically to each inner end of a pair of power supply pins extending toward outside the discharge vessel held by the said pinch-seal. In this lamp, the electrode films have a double layer formed by folding along fold lines extending along the tube axis, and inner ends of the supply pins are preferred to be connected helping its inner end inside this folded portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source for illuminating a document in information equipment such as a facsimile, a copying machine, an image reader, etc. More particularly, the present invention relates to an internal electrode type discharge lamp having a pair of electrode films extending in the tube axis direction on the inner wall of a discharge vessel.

[0002]

2. Description of the Related Art Generally, an internal electrode type discharge lamp has a pair of strip-like electrode films arranged on the inner wall of a glass tube forming a discharge vessel so as to face each other so as to extend along the tube axis of the glass tube. The electrical connection with the power supply pins extending to the outside of the discharge vessel through the hermetic sealing portions formed at both ends of the glass tube is achieved inside the discharge vessel.

For example, Japanese Patent Application Laid-Open No. 3-88258 discloses a discharge vessel in which a power supply pin wound with glass beads is sealed at both ends of a glass tube to form a discharge vessel, and an elastic contact plate provided at an inner end of the power supply pin. Describes an internal electrode type discharge lamp in which an electric connection with the electrode film is achieved by elastically contacting an end of the electrode film.

[0004] However, in such an internal electrode type discharge lamp, the electrode film is easily damaged at the elastic contact portion between the electrode film and the elastic contact plate, and the position of the elastic contact plate and the electrode film may be shifted. After all, the electrical connection between the electrode film and the power supply pin is not reliable, stable discharge cannot be obtained, and the structure is complicated, so that it is difficult to manufacture.
There is a problem.

Further, it is difficult to arrange a pair of power supply pins at the same end of the glass tube, and it is necessary to arrange them at both ends. Therefore, lead wires for connecting to an external lighting circuit are arranged. However, there is a problem in that the lamp becomes complicated and the overall length of the lamp increases.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to easily and surely achieve an electrical connection between an electrode film and a power supply pin. It is an object of the present invention to provide an internal electrode type discharge lamp which can be used. Another object of the present invention is to provide an internal electrode type discharge lamp in which a pair of power supply pins can be arranged on one end side of a discharge vessel and electrical connection with an electrode film is reliably achieved. .

[0007]

According to the present invention, there is provided an internal electrode type discharge lamp in which a pair of electrode films are arranged on an inner wall of a glass tube forming a discharge vessel along a tube axis direction, and the glass tube is provided. A pinch seal is formed at one end of the
In the pinch seal portion, an end portion of each electrode film and each inner end of a pair of power supply pins extending outward from the discharge vessel held by the pinch seal portion are electrically connected. I do.

In the above internal electrode type discharge lamp,
In the pinch seal portion, the electrode film is folded along a fold line extending in the tube axis direction to form a double folded portion, and the inner end of the power supply pin is connected while being sandwiched by the folded portion. It is preferred that

[0009]

According to the above arrangement, the discharge vessel can be easily manufactured by forming the pinch seal portion on the glass tube, and the power supply pin can be reliably held. Since the electrode films and the power supply pins are electrically connected, a hermetic power supply structure for the internal electrodes can be realized with a very simple configuration. In addition, since the pair of power supply pins are led out from one end of the glass tube, the lead wires connected to the external lighting circuit can be easily routed, and the structure of the lamp unit can be simplified. As a result, the overall length of the lamp can be reduced, and as a result, the ratio of the light emitting region to the overall length of the lamp increases.

In the pinch seal portion, the inner end of the power supply pin is connected to the electrode film while being sandwiched between the folded portions formed on the electrode film, so that the electric power between the electrode film and the power supply pin is reduced. The secure connection is ensured, and the folded portion can be formed automatically, so to speak, by forming the pinch seal portion, so that the manufacturing is easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of one end portion of a configuration example of an internal electrode discharge lamp of the present invention.
Is a cross-sectional view in the tube axis direction of one end of the internal electrode discharge lamp in FIG. 1, FIG. 3 is a cross-sectional view along the AA plane in FIG. 2, and FIG. FIG. In this internal electrode type discharge lamp, a pair of strip-shaped electrode films 20 are spaced apart in the same direction along the tube axis L direction of the glass tube 10 on the inner wall of a straight tube glass tube 10 forming a discharge vessel. The glass tube 1
A substantially plate-shaped pinch seal portion 11 extending in the diameter direction is formed at one end of the zero. The discharge vessel is filled with a rare gas such as xenon or a mixed gas thereof as an excimer generation gas.

The glass tube 10 forming the discharge vessel is made of a light-transmitting dielectric. For example, various glasses such as borosilicate glass, lead glass, soda-lime glass, quartz glass, and aluminosilicate glass can be used.

A dielectric layer 22 is integrally formed so as to cover the surfaces of the pair of electrode films 20, and a phosphor layer 23 is integrally formed so as to cover the dielectric layer 22. I have.

The electrode film 20 is made of, for example, gold, silver, nickel,
It is preferably formed of a metal such as iron or copper and a metal paste, or a mixture of these metal powders and a glass paste, or a carbon paste. When the electrode film 20 is formed of metal or metal paste, it is preferable to use silver or silver paste. The dielectric layer 22 is made of, for example, the glass tube 1.
It is made of a dielectric material having a coefficient of expansion approximately equal to zero. For the phosphor layer 23, a known fluorescent substance such as a rare earth phosphor or a halophosphate phosphor can be used. In particular, in order to obtain red visible light, Y ₂ O ₃ : Eu, (YGd) BO ₃ : E
u, to obtain green visible light, use LaPO ₄ : Ce, T
b, Zn ₂ SiO ₄ Mn, Y ₂ SiO ₄ : Tb, and (SrCaBaMg) ₅ (PO ₄ ) ₃ C to obtain blue visible light
l: Eu, 3 BaMgEu) O · 8 Al 2 O 3 it is possible to use, respectively. In addition, the phosphor layer 23 can be a composite phosphor layer in which a phosphor layer is formed as a surface layer on a base layer made of a reflector layer. In this case, as a substance constituting the reflector layer, For example, α-alumina, γ
-Alumina, titanium oxide, calcium pyrophosphate, silica, barium sulfate and the like.

As shown in FIGS. 2 and 3, in the pinch seal portion 11, one end of the electrode film 20 is folded along a fold line extending in the tube axis L direction to form a double folded portion 21. Are formed, and the pinch seal portion 11 is formed.
Each of the inner ends of a pair of power supply pins 12, 12 extending outward from the airtight power supply is fixed while being sandwiched by the folded portion 21, and the electrode film 20 and the power supply pin 12 are electrically connected to each other. Forming the structure.

For the power supply pin 12, for example, a conductive material such as a Dumet wire having an expansion coefficient similar to that of the glass tube 10 can be used.

This internal electrode type discharge lamp is manufactured as follows. That is, as shown in FIG. 5 and FIG. 6, a pair of electrode films 20 are formed on the inner wall of the glass tube material 10A.
A dielectric layer 22 is formed so as to cover the electrode film 20.
And the phosphor layer 23 are laminated and provided on the surface of the electrode film 20. Here, at one end of the glass tube material 10A,
The surface of the portion where the folded portion 21 is formed by pinch sealing is an electrode film exposed portion 24 from which the electrode film 20 is exposed. Then, a pair of power supply pins 12, 1
2 is inserted and arranged in each of the electrode film exposed portions 24 at one end of the glass tube material 10A, and then the electrode film 20 is
Are folded in the tube axis direction to perform a pinch seal, thereby forming folded portions 21, 21, and the inner ends of the power supply pins 12, 12 are folded into the folded portions 21, 2, respectively.
In addition to being fixed in a state of being sandwiched between the two, electrical connection between the electrode film 20 and the power supply pin 12 is achieved, thereby forming an airtight power supply structure. Thereafter, an exhaust pipe is provided at the other end of the glass tube material 10A, and after venting the gas in the glass tube material 10A and sealing a predetermined sealing gas, the exhaust pipe is heated by a burner or the like to be melted and sealed. I do. Thus, an internal electrode type discharge lamp as shown in FIG. 7 is manufactured. Reference numeral 13 denotes a remaining portion of the exhaust pipe.

An example of the dimensions of the internal electrode type discharge lamp of the present invention is as follows. The outer diameter of the glass tube 10 is 8 to 10 mm and the length is 10
The length of the pinch seal portion 11 is 5 to 15 mm, and the thickness of the glass tube 10 is 0.1 to 400 mm.
3 to 1.0 mm; the thickness of the electrode film 20 is 5 to 10 μm; the thickness of the dielectric layer 22 is 50 to 100 μm; the thickness of the phosphor layer 23 is 5 to 20 μm; 35 ~
1.0 mm. When a reflective material layer is formed, the thickness of the reflective material layer is preferably, for example, 20 to 100 μm, and is interposed between the dielectric layer 22 and the phosphor layer 23.

According to the internal electrode type discharge lamp described above, the discharge vessel can be easily manufactured by forming the pinch seal portion 11 by pinch sealing one end of the glass tube 10, and furthermore, the power supply pin is provided. 12 can be securely held, and in this pinch seal portion 11,
Since the electrode film 20 and the power supply pin 12 are electrically connected reliably, a highly reliable hermetic power supply structure for the internal electrodes can be realized with a very simple configuration.

Further, since the pair of power supply pins 12 and 12 are both led out from the same end of the glass tube 10, the lead wires connected to the external lighting circuit can be easily routed, and, for example, the lamp operates. It can be suitably used for various types of OA equipment. Further, the structure of the lamp unit can be simplified, and the overall length of the lamp can be reduced. As a result, the ratio of the light emitting region to the overall length of the lamp can be increased.

Further, since the feed pin 12 is connected to the electrode film 20 in the pinch seal portion 11 while being sandwiched between the folded portions 21 formed on the electrode film 20,
The electrical connection between the electrode film 20 and the power supply pin 12 is ensured, and the folded portion 21 is connected to the pinch seal portion 1.
Since it can be automatically formed by the formation of 1, the manufacturing is easy.

Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above examples, and various changes can be made to the specific configuration of each unit. For example, in the pinch seal portion 11, if the electrical connection is sufficient, the power supply pin 12 does not have to be sandwiched between the electrode films 20. For example, even if the configuration shown in FIG. Such effects as described above are not impaired.

Further, as shown in FIG.
May have a configuration in which the pinch seal portion 31 is deflected to one side in the vertical cross section of the glass tube. In this case, for example, when the lamp unit is configured, Therefore, it is possible to approach a document arranged on the opposite side (upper side in the figure) to the pinch seal portion 31 of the internal electrode type discharge lamp.
32 is a power supply pin.

Further, as shown in FIG.
May have a configuration in which the pinch seal portion 41 is bent in the thickness direction at the base thereof and the power supply pin 42 extends in the direction perpendicular to the tube axis of the discharge vessel 40. In this case, the internal electrode type The lamp unit can be configured by directly disposing the discharge lamp on the substrate, and the total length of the internal electrode discharge lamp can be further reduced.

The internal electrode type discharge lamp of the present invention utilizes a configuration in which the electrode films are arranged on both sides in the pinch seal portion in a separated state, for example, as shown in FIG. 50 can be configured such that a screw hole 53 is formed in the center portion of the pinch seal portion 51, and in this case, the lamp can be easily mounted by the mounting screw 54.

[0026]

According to the internal electrode type discharge lamp of the present invention, the discharge vessel can be easily manufactured by forming the pinch seal portion in the glass tube, and the power supply pin can be held. In this pinch seal portion, the electrode film and the power supply pin are electrically connected, so that an airtight power supply structure for the internal electrode can be realized with a very simple configuration. In addition, since a pair of power supply pins are led out from one end of the glass tube, the lead wires connected to the external lighting circuit can be easily routed, and the structure of the lamp unit can be simplified. As a result of reducing the overall length of the lamp, the ratio of the light emitting area to the overall length of the lamp is increased.

In the case where the power supply pin is connected to the electrode film in a state where the power supply pin is sandwiched between the folded portions formed on the electrode film in the pinch seal portion, the electrical connection between the electrode film and the power supply pin is established. This is reliable, and the folded portion can be formed automatically, so to speak, by forming the pinch seal portion, so that manufacturing is easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of one end of a configuration example of an internal electrode discharge lamp of the present invention.

2 is a sectional view of one end of the internal electrode type discharge lamp of FIG. 1 in a tube axis direction.

FIG. 3 is a vertical sectional view taken along a plane AA in FIG. 2;

FIG. 4 is an explanatory perspective view showing a folded portion of an electrode film.

FIG. 5 is an explanatory vertical cross-sectional view showing a state in which an electrode film, a dielectric layer, and a phosphor layer are stacked and disposed on an inner wall of a glass tube material.

FIG. 6 is a perspective view showing an appearance of one end of a glass tube material in which an electrode film, a dielectric layer and a phosphor layer are laminated on an inner wall.

FIG. 7 is an explanatory plan view showing one configuration example of an internal electrode discharge lamp of the present invention.

FIG. 8 is a vertical sectional view of a pinch seal portion in another configuration example.

FIG. 9 is a perspective view showing the appearance of one end of an internal electrode discharge lamp in which a pinch seal portion is formed so as to be shifted to one side in a vertical cross section of the glass tube.

FIG. 10 is a perspective view showing an appearance of one end of an internal electrode discharge lamp formed by bending a pinch seal portion in a thickness direction.

FIG. 11 is a perspective view showing an appearance of one end showing an example when an internal electrode type discharge lamp is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Glass tube 10A Glass tube material 11 Pinch seal part 12 Power supply pin 13 Exhaust pipe remaining part 20 Electrode film 21 Folding part 22 Dielectric layer 23 Phosphor layer 24 Electrode film exposed part 30, 40, 50 Discharge container 31, 41, 51 Pinch Seal part 32, 42, 52 Power supply pin 53 Screw hole 54 Screw

Claims (2)

[Claims] 1. An inner wall of a glass tube forming a discharge vessel,
A pair of electrode films are arranged facing each other along the tube axis direction, and a pinch seal portion is formed at one end of the glass tube. In the pinch seal portion, an end portion of each electrode film and the pinch seal portion are formed. An internal electrode type discharge lamp, wherein the inner ends of a pair of power supply pins extending outwardly of the discharge vessel held by the internal electrode are electrically connected. In the pinch seal portion, the electrode film is formed along a fold line extending in the tube axis direction to form a double fold portion, and the power supply pin is sandwiched between the fold portions. 2. The internal electrode type discharge lamp according to claim 1, wherein an inner end of the discharge lamp is connected.