CN1913072A - Outside electrode type discharging lamp tube and discharging lamp tube device - Google Patents

Abstract

The present invention provides an external electrode type discharge lamp with simple manufacture and simple structure and high luminous efficiency. Its structure is that on the surface of the glass tube (1) filled with rare gas, a pair of strip-shaped electrodes (2a, 2b) are arranged oppositely in parallel in the axial direction, and one end (1a) of the lamp tube L is set to only One electrode (2a) is used as a feeding part, and the other end part (1b) is provided so that only the other electrode (2b) facing the one electrode (2a) is used as a feeding part. That is, there is no opposing electrode (2b) at one end (1a) of one electrode (2a), and there is no opposing electrode (2a) at the other end (1b) of the other electrode (2b).

Description

External electrode type discharge lamp and lamp device thereof

technical field

The present invention relates to an external electrode type discharge lamp, and in particular to an external electrode type fluorescent lamp used as a light source for document reading in a scanner or a copier, and an external electrode type excimer used as a light source for UV cleaning (Ekishima) tube.

Background technique

In recent years, the light source for document reading in scanners or copiers generally uses an external electrode discharge lamp that does not contain metal vapor such as mercury and has a pair of strip electrodes placed outside the glass vacuum tube.

The document is read by irradiating light from the discharge lamp installed under the document surface to the document surface, and receiving the reflected light from the document surface by the CCD linear sensor.

This kind of lamp has a pair of electrodes on the outer peripheral surface of the lamp luminous tube. The electrodes exist such as those described in JP 11-54089 that are opposite to the longitudinal direction of the luminous tube and extend into a strip shape, such as those described in JP 2002-8408. Both ends of the arc tube are formed in a cap shape.

It is considered that in the former case, the luminous efficiency from the arc tube is high because the discharge is generated in substantially the entire area of the arc tube.

In addition, since the external electrode type fluorescent tube is not filled with mercury, it is the latest environmentally friendly product, and it is expected to be applied to backlights such as liquid crystal monitors.

However, when a pair of strip-shaped electrodes are arranged facing each other, there is a problem that the power supply structure becomes complicated. As shown in FIG. 5 of JP-A-11-54089, when the ends of the electrodes are respectively connected to the pins, the manufacturing process is complicated, and there are problems such as broken wires due to pulling back and forth during use.

On the other hand, as shown in FIG. 1 of the literature, providing an end cap covering the end of the arc tube can also provide a power supply structure with different potentials for each electrode. However, in this structure, there is a problem that the power supply structure in the end cap becomes complicated.

[Patent Document 1] Japanese Patent No. 3622721

Contents of the invention

The problem to be solved by the present invention is to provide an external electrode type discharge lamp with simple manufacture, simple structure and high luminous efficiency.

In order to solve the above-mentioned problems, the external electrode type discharge lamp of the present invention has a pair of strip-shaped electrodes arranged opposite to each other in parallel in the axial direction on the surface of the glass tube filled with rare gas, and is characterized in that: It is installed so that only one electrode is used as a power supply part, and the other end is provided so that only the other electrode facing the one electrode is used as a power supply part.

In addition, it is characterized in that one end portion of the one electrode and the other end portion of the other electrode have a larger area per unit length than the other strip-shaped portion.

Furthermore, it is characterized in that the one end portion of the one electrode and the other end portion of the other electrode are formed in a ring shape on the outer peripheral surface of the glass tube.

In addition, a lamp device comprising an external electrode fluorescent lamp tube and a power supply member holding the external electrode fluorescent lamp tube by an end portion is characterized in that the external electrode fluorescent lamp tube is formed on the surface of a glass tube filled with a rare gas. 1. A pair of strip-shaped electrodes are arranged parallel to each other in the axial direction; the structure of the aforementioned power supply member is that it is arranged at both ends of the aforementioned external electrode type fluorescent lamp tube, each of which is a single pole, and is located at one end of the aforementioned external electrode type fluorescent lamp tube. , to supply power to one electrode; to supply power to the other electrode at the other end.

The effect of the invention

According to the above configuration, the external electrode type discharge lamp according to the present invention can be easily manufactured, have a simple structure, and have a high luminous efficiency.

Description of drawings

Fig. 1 shows an external electrode type discharge lamp of the present invention.

Figure 2 shows the power supply jig.

Fig. 3 shows the electrodes of the external electrode type discharge lamp of the present invention.

Fig. 4 shows an external electrode type discharge lamp of the present invention.

Fig. 5 shows another embodiment of the strip electrode of the external electrode type discharge lamp of the present invention.

Fig. 6 shows a lamp device comprising an external electrode fluorescent lamp according to the present invention and a power supply jig that holds the external electrode fluorescent lamp at its end.

Detailed ways

Fig. 1 shows an external electrode type discharge lamp related to the present invention, (a) is a schematic diagram of a discharge lamp L seen from the top, (b) shows a cross-sectional view of AA' of (a), (c ) shows the external appearance of the side of the electrode 2a seen in (b) (refer to the arrow in b).

In FIG. 1, a discharge lamp L is composed of a glass tube 1, and a pair of electrodes 2a, 2b are provided on the outer surface thereof. The glass tube 1 is made of, for example, lead glass, and thus is filled with xenon gas as a rare gas or a mixed gas mainly composed of xenon gas.

A substantially C-shaped fluorescent substance is coated on the inner wall surface of the glass tube 1 to form a fluorescent substance layer 3 . In the case of a single-type document reading light source, as the fluorescent substance, a substance having an emission peak near a wavelength of 550 nm is selected. An opening 4 to which no fluorescent substance is applied is formed on the inner wall surface of the glass tube 1 .

In addition, since the phosphor layer 3 is formed, the discharge lamp L emits visible light. At this time, it is also called a rare gas fluorescent lamp.

The electrodes 2a and 2b are substantially strip-shaped as a whole, and are provided on the outer wall of the glass tube 1 and elongate in the axial direction (longitudinal direction). The electrodes 2a, 2b are formed of conductive materials such as metal strips such as aluminum alloy and copper or silver paste.

Furthermore, slits or openings can be provided in the electrodes 2a, 2b. This is because the light emitted inside the glass tube 1 is emitted not only from the opening but also from the slit. A technique for forming slits in electrodes is disclosed in, for example, Japanese Unexamined Patent Publication No. 9-298049.

In the discharge lamp L, when a high-frequency voltage is applied to a pair of electrodes 2a and 2b, a dielectric barrier discharge (barrier discharge) occurs by using the glass tube (glass material) sandwiched between the electrodes as a dielectric, and the discharge The generated ultraviolet rays make the fluorescent substance 6 coated on the inner surface of the glass emit light.

Here, as a numerical example, assume that the length of the glass tube 1 is 370 mm, the outer diameter is Φ10 mm, and the luminous length is about 340 mm. The xenon gas filled in the glass tube 1 is selected from the range of 10k to 100kPa, for example, 50kPa is filled. The width of the electrode 2 is selected from the range of 3 to 10 mm, for example, 7 mm. The rare gas fluorescent lamp is lit at a rated lighting electric power of 26W.

Here, the discharge lamp L can emit ultraviolet light when no phosphor is applied. This ultraviolet light can be said to be excimer light, and strongly emits light of a single wavelength. The light of this single wavelength is determined by the gas filled in the glass tube. When it is xenon gas (Xe), it emits light with a wavelength of 172nm. When it is argon (Ar) or chlorine gas (CL), it emits light with a wavelength of 175nm. , when it is krypton (Kr) and iodine (I), it emits light with a wavelength of 191nm, when it is argon (Ar) and fluorine (F), it emits light with a wavelength of 193nm, it is krypton (Kr) and bromine ( Br) emits light with a wavelength of 207 nm, and when it is krypton (Kr) and chlorine (CL), emits light with a wavelength of 222 nm. As the glass tube radiates ultraviolet rays, quartz glass is used.

This excimer light can be used for UV cleaning of materials such as quartz glass or surface modification of other materials.

Here, the present invention has the following structure: a pair of electrodes is substantially strip-shaped and extends along the length direction of the glass tube, and one end 1a is provided with only one electrode 2a as a power supply part, and the other end 1b is only provided with this one electrode 2a. The other electrode 2b facing the electrode 2a is provided as a power feeding part. That is, the one end side of the one electrode 2a is not provided with the opposing electrode 2b, and the other end side of the other electrode 2b is not provided with the electrode 2a in the opposite direction.

FIG. 2 shows a jig 5 which is a power supply member for holding an external electrode type discharge lamp L according to the present invention. The jig 5 is made of a conductive member such as phosphor bronze, and since the lamp tubes L are mounted on the supporting portion 50, the lamp tubes L can be supported simultaneously when power is supplied to the lamp tubes L.

That is, when the discharge lamp L is attached to the jig 5, although it contacts the one electrode 2a, it does not contact the other electrode 2b.

Furthermore, although the jig 5 is also provided at the end (the other end) on the opposite side of the discharge lamp L, the jig provided at the other end is in contact with the other electrode 2b without contacting the other electrode 2b. It is in contact with one electrode 2a.

In this configuration, power is supplied to one electrode 2a of the discharge lamp L through the fixture provided at one end, and power is supplied to the other electrode 2b of the discharge lamp L through the other fixture provided at the other end. powered by.

In addition, a stopper for the discharge lamp is formed in the jig 5 .

Returning to FIG. 1 , the length s of the region where the opposing electrode 2b is not present at the one end portion 2a1 of the one electrode 2a needs only to correspond to the length of the supporting portion of the jig. As an example, the length S is about 5 to 10 mm, and it becomes about 15 mm when a stopper (stopper) is taken into consideration.

Fig. 3 shows another embodiment of the external electrode type discharge lamp according to the present invention.

The other end portion 2b1 of the electrode 2b has a larger area than the strip-shaped region 2b. The advantage of this structure is that when it is mounted on the jig 5, the area in contact with the electrodes becomes larger, and the power supply efficiency increases. In addition, although only the electrode 2b is shown in the drawing, the area of one end portion of the electrode 2a is similarly enlarged.

Fig. 4 shows another embodiment of the external electrode type discharge lamp according to the present invention.

The end portion 2b1 of the electrode 2 is annular, and the entire annular portion is in contact with the jig. The advantage of this structure is also the same. When it is mounted on the jig 5, the area in contact with the electrode becomes larger, and the power supply efficiency can be increased. Moreover, although only the electrode 2b is shown in a figure, the other end part of the electrode 2a is formed in ring shape similarly.

FIG. 5 shows an embodiment of the electrode 2 . The "strip" of the strip-shaped electrode means the shape formed according to the envelope of the electrode outer edge, and includes linear, mesh, helical, and the like as shown in (a) to (e). Also, as shown in Figure f, the "strips" of the strip electrodes are not necessarily of the same width.

Fig. 6 shows an end portion of a lamp apparatus formed by an external electrode type fluorescent lamp tube and a power supply member holding the external electrode type fluorescent lamp tube at the end portion. The external electrode type fluorescent lamp has the structure shown in FIG. 3, and the width of the end portion 2b1 of the electrode 2b is wider than the width of the strip-shaped region. The holding part 50 of the clamp 5 which is a power supply member has elastic force, and when the glass tube 1 of the lamp tube is inserted into the holding part 50, the holding part 50 is expanded and held. Although the electrode 2 b is in contact with the holding portion 50 at this time, the electrode 2 a is not in contact with the holding portion 50 . Thereby, the electric power supplied to the holding part 50 is supplied only to the electrode 2b, and is not supplied to the electrode 2a. As shown in FIG. 2 , the clips 5 are respectively arranged at both ends of the lamp tube, and extend along directions perpendicular to the length direction of the lamp tube. Each fixture is unipolar, and one end 1a of the lamp tube supplies power to one electrode 2a, and the other end 1b of the lamp tube supplies power to the other electrode 2b.

With the above configuration, the external electrode type discharge lamp according to the present invention is easy to manufacture, has a simple structure, and can improve luminous efficiency.

Symbol Description

1 glass tube

2a electrode

2b electrode

3 insulator layer

4 opening

5 power supply components

Claims (4)

1. external-electrode discharge lamp pipe, it is on the surface of the glass tube that is charged into rare gas, be oppositely arranged a pair of band electrode abreast along axis direction, it is characterized in that: an end is arranged to only a side electrode is arranged to the opposing party's that only will be relative with an aforementioned side's electrode electrode as power supply as power supply, an other end.

2. external-electrode discharge lamp pipe as claimed in claim 1 is characterized in that: other band-like portions are compared in the other end of end of an aforementioned side's electrode and the opposing party's electrode, and the area of its unit length is big.

3. external-electrode discharge lamp pipe as claimed in claim 1 is characterized in that: an end of an aforesaid side's electrode and the other end of the opposing party's electrode are formed ring-type on the outer peripheral face of glass tube.

4. lamp tube device, it is that the power supply component that keeps in the end by the external electrode fluorescent lamp pipe with this external electrode fluorescent lamp pipe is formed, it is characterized in that:

Said external electrode type fluorescent lamp pipe is oppositely arranged along axis direction abreast in the glass tube surface that charges into rare gas, a pair of band electrode;

Aforementioned power supply component, the structure that has be, is arranged on the both ends of said external electrode type fluorescent lamp pipe, and each is one pole, in an end of said external electrode type fluorescent lamp pipe one side's electrode is powered, in an other end to the opposing party's electrode power supply.

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