JP4063080B2 - Noble gas discharge lamp - Google Patents

Description

【００３１】
表１の結果、リード線が接続された電極が絶縁部材に被覆されていないものでは、リード線の引っ張り強度が管径がφ５ｍｍのもので約２．９８Ｎ、管径φ４ｍｍのもので１．９６、管径φ３ｍｍのものでは１Ｎに満たない０．９８であった。
このように引っ張り強度が小さいと、製作中に不良となる確率が極めて高くて量産することは不可能である。尚、本実験例により、本発明者らは、リード線の引っ張り強度が５Ｎ以上、好ましくは８Ｎ以上、より好ましくは１０Ｎ以上であれば、リード線の取り回し中に電極に不具合を生じにくいという検知を得た。
【００３２】
図４に示すように、電極の被覆長さが１ｍｍのとき、管径φ５ｍｍの場合はリード線の引っ張り強度が１０Ｎ以上であり、十分高い機械的強度が得られることが確認できた。また、比較例２に係る電極が一切絶縁部材で被覆されないものに比較して３倍以上の強度が得られるようになると分かった。更に、管径がφ４ｍｍの場合でも、電極の被覆長さが１ｍｍを超えると、リード線引っ張り強度を８Ｎ以上に高くすることが可能であると分かった。
【００３３】
尚、比較例１に係る電極の被覆長さが０ｍｍであるものは、比較例２に係るものに比較して若干の強度向上が認められるが、リード線の引っ張り強度が５Ｎに満たないため、実際の作業では不良の発生率が高くて実使用できるものではなかった。
【００３４】
以上のように、本発明に係る第一の絶縁部材と第二の絶縁部材の間にリード線の接合部を形成した希ガス放電灯によれば、リード線の引っ張り強度を高くすることができ、リード線の引っ張り強度を増すことができて生産性が良好であることが判明した。
更には、電極被覆長さを１ｍｍ以上にすると、８Ｎ以上に高い強度を得ることができると分かった。
【００３５】
【発明の効果】
以上説明したように、本発明によれば、幅が狭い電極であっても電極とガラス管の密着強度が高く、リード線の取り回しを容易にできて、電極の給電用導出部において不具合を生じにくい、希ガス放電灯を提供することができる。
その結果、希ガス放電灯のコンパクト化を実現しつつ、生産性良好な希ガス放電灯を提供できる。
【図面の簡単な説明】
【図１】 本発明の第一の実施形態に係る希ガス放電灯の管軸方向断面図である。
【図２】 図１中の線分Ａ−Ａで切断した希ガス放電灯の断面図である。
【図３】 本発明の実施形態を説明する図である。
【図４】 実験例の結果を示す、距離Ｌ１とリード線の引っ張り強度の関係を示す図である。
【符号の説明】
１１ ガラス管
１１Ａ 一端部
１１Ｂ 他端部
２１ 一方の電極
２１Ａ 一端部
２１Ｂ 他端部
２２ 他方の電極
２２Ａ 一端部
２２Ｂ 他端部
２１Ｓ、２２Ｓ 電極露出部
３０ 蛍光体層
４０ アパーチャ
５０ リード線
５１ 半田
５２ リード線接合部
６１ 第一の絶縁部材
６２ 第二の絶縁部材
６１Ａ、６２Ａ、６３Ａ 絶縁チューブ
６４ つなぎ用絶縁部材
Ｓ 離間部分
Ｈ 開口穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a noble gas discharge lamp used for illuminating a document in information equipment such as a facsimile, a copying machine, and an image reader, or a backlight of a liquid crystal panel display, and more particularly to a CIS (contact image sensor) type reading. The present invention relates to a rare gas discharge lamp used as a light source.
[0002]
[Prior art]
In recent years, a CIS (contact image sensor) method has been developed as a reading method for scanners and copying machines, and is used in many scanners and copying machines. In such a CIS system, light from a light source is irradiated onto a document sandwiched between a platen and a glass plate, and the reflected light is received and digitized to read the content of the document. There is an advantage that the structure is simple and compact. In this contact image sensor, for example, a light emitting diode (LED) array as a light source, a lens, a sensor, and the like are integrally configured as described in JP-A-4-360458 (Patent No. 2955595). It is considered as a unit.
[0003]
On the other hand, a reduction optical system is generally used in a scanner or a copying machine, and a rare gas discharge lamp is used as a light source. In such a rare gas discharge lamp, a rare gas such as xenon is sealed in a straight tubular glass tube, and a set of substantially rectangular metal foils made of, for example, aluminum (Al) is formed on the outer surface of the glass tube. A pair of electrodes are provided by being attached to the opposite portions in the cross-sectional direction of the tube. A high-frequency voltage is applied to the pair of electrodes, and ultraviolet rays generated by rare gas discharge are irradiated to the fluorescent material layer formed in the glass tube and excited to obtain visible light emission.
[0004]
Recently, this rare gas discharge lamp is also considered to be used as the light source of the above-mentioned contact image sensor, but for that purpose, compared with the rare gas discharge lamp used in the conventional reduction optical system. It is necessary to extremely reduce the outer diameter of the glass tube (hereinafter referred to as “tube diameter”). Specifically, the tube diameter of about φ8 to 12 mm needs to be reduced to about φ3 to 6 mm for the contact image sensor application.
[0005]
If the glass tube is made thinner, it is necessary to reduce the width of the electrode and increase the insulation distance. In terms of the actual use range, in the rare gas discharge lamp for the reduction optical system, the tube diameter is 8 to 12 mm and the electrode width is 5 to 9 mm. However, if the tube diameter is 3 to 6 mm for the contact image sensor, The electrode width must be about 1 mm. When the width of the electrode is reduced in this way, it is difficult to connect a power supply terminal member or the like to the electrode. For example, as in the technique described in Japanese Patent No. 2729100, the power supply lead wire is directly soldered to the electrode. This is a simple method.
[0006]
[Patent Document 1]
Japanese Patent No. 2729100 [0007]
[Problems to be solved by the invention]
Thus, when the width of the electrode is about 1 mm, there is a problem that a defect is likely to occur near the joint portion of the electrode lead wire.
[0008]
That is, since the width of the metal foil constituting the electrode is narrowed, its mechanical strength is reduced, and the lead wire connected to the electrode is routed when the rare gas discharge lamp is manufactured or after the final form is formed. There arises a problem that the metal foil is deformed or peeled off because the bonding area with the glass tube is narrowed. Further, when the lead wire and the metal foil are directly joined by solder, there may be a problem that the metal foil is distorted in the process in which the molten solder metal is cooled and contracted.
[0009]
If the metal foil is peeled off or deformed as described above, an inevitable gap is formed between the electrode and the glass tube, and the power supplied to the glass tube is locally insufficient when the rare gas discharge lamp is turned on. To form a dark part. In such a rare gas discharge lamp, since a desired illuminance distribution cannot be obtained in the light emitting area, it cannot be used as a light source for reading a document.
[0010]
Therefore, the object of the present invention can be suitably used for illuminating a document, and even in the case of an electrode made of a metal foil having a narrow width, the mechanical strength in the vicinity of the joint portion of the power supply lead wire is high, and it is suitable for mass production. The object is to provide a suitable rare gas discharge lamp.
[0011]
[Means for Solving the Problems]
Therefore, a rare gas discharge lamp according to the present invention includes a glass tube filled with a rare gas, and one electrode made of a metal member extending in the length direction of the glass tube formed on the outer surface of the glass tube. A lead wire for power supply joined to the one electrode, and the other electrode disposed through the one electrode and at least one dielectric, the one electrode being On the electrode, the first insulating member and the second insulating member are covered with a first insulating member and a second insulating member that are spaced apart from each other in the length direction of the electrode and are made of a heat-shrinkable tube. A lead wire bonding portion is formed on the electrode exposed at a distance from the member.
In addition, a connection insulating member for connecting the first insulating member and the second insulating member is formed .
Further, the first insulating member and the second insulating member cover the one electrode in the length direction by 1 mm or more.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of the rare gas discharge lamp according to the first embodiment of the present invention in the tube axis direction shown in a partial cross section, and FIG. 2 shows this rare gas discharge lamp along line A-- in FIG. It is sectional drawing cut | disconnected by A. FIG.
Both ends (11A, 11B) of the glass tube 11 are hermetically reduced in diameter and hermetically sealed, and a pair of electrodes including one electrode 21 and the other electrode 22 are formed on the outer surface of the glass tube 11. The two dielectrics formed by the tube wall and the discharge space are arranged to face each other. The glass tube 11 is filled with a predetermined rare gas, and a phosphor layer 30 is formed on the inner surface by applying a phosphor. A part of the phosphor layer 30 is removed in the direction of the tube axis of the glass tube, whereby an aperture 40 for extracting light is formed.
[0013]
The glass tube 11 has, for example, dimensions of an outer diameter of 4 mm, a thickness of 0.5 mm, a length of 360 mm, and a transparent barium glass.
[0014]
The pair of electrodes 21 and 22 is formed, for example, by sticking a metal foil in a tape shape to a glass tube.
The material of the electrodes 21 and 22 is preferably aluminum. For example, a substantially strip-shaped metal foil having a thickness of 70 μm, a length of 358 mm, and a width of 1.5 mm is stuck on the outer surface of the glass tube 11. Composed. The “electrode length” is the total length in the electrode longitudinal direction, and the “electrode width” is the total length in the electrode short direction.
[0015]
As shown in FIG. 1, the first insulating member 61 is on the one end 11A side of the glass tube 11, the second insulating member 62 is on the other end 11B side, the first insulating member 61 and the second insulating member. A separation portion S is formed between the electrodes 62 and 62 and the electrodes 21 and 22 or the outer surface of the glass tube 11 are provided in close contact with each other.
In the figure, the distance L1 covered by the first insulating member 61 from the one end portions 21A and 22A of the electrodes 21 and 22 is, for example, 0.1 mm to 6.0 mm, and preferably 1 mm or more. The distance L2 that the second insulating member 62 covers the electrodes 21 and 22 is, for example, 0.1 mm to 354.5 mm, and may be 1 mm or more. In particular, the second insulating member 62 preferably covers the other end portions 21 </ b> B and 22 </ b> B of the electrodes 21 and 22.
[0016]
Here, in the separation portion S between the first insulating member 61 and the second insulating member 62, exposed portions 21S and 22S of the electrodes are formed, and the lead wires 50 and 50 for power feeding are soldered at the portions. The lead wire joint portions 52 and 52 are formed by direct joining at 51 and 51.
The distance in the electrode length direction of the separation portion S between the first insulating member 61 and the second insulating member 62 is preferably, for example, 2 mm or more so that the lead wire can be connected, and the lead wire joint portion 52. , 52 is preferably 5 mm or less, for example, so that the electrode positioned in the vicinity of 52 is fixed. Specifically, it is 3.5 mm to 4.5 mm, and it is good that it is 3.0 mm to 4.0 mm among them.
[0017]
The first and second insulating members can be arranged by the following procedure, for example, by a light-transmitting insulating tube having heat shrinkability.
[0018]
FIGS. 3A and 3B are enlarged perspective views of the main part of the rare gas discharge lamp, as seen from the direction of the side surface on which one electrode is disposed. The same reference numerals are given to the same configurations as those described above.
For example, as shown in FIG. 3A, two insulating tubes 61A and 62A are arranged at a predetermined distance apart from each other on the glass tube 11 to which the electrode 21 is adhered. When the glass tube 11 is heated to, for example, 150 to 200 ° C. with the insulating tubes 61A and 62A attached, the insulating tubes 61A and 62A are thermally contracted to form the first and second insulating members 61 and 62. Is done.
The electrode 21 is pressed and fixed in the center direction of the glass tube 11 by the first and second insulating members 61 and 62, and the electrode is exposed between the first insulating member 61 and the second insulating member 61. Part 21S is formed.
[0019]
Further, as shown in FIG. 3B, one insulating tube 63A provided with an opening hole H may be attached to the glass tube 11 so that the opening hole H corresponds to the electrode 21 and thermally contracted.
[0020]
Even in the case where one insulating tube 63A is used, the first insulating member 61 is provided on the electrode 21 from the one end 21A to the edge of the opening hole H in the length direction thereof. The second insulating members 62 are provided from the other edge of the opening hole H to the other end of the electrode. In the circumferential direction of the opening hole H, a connecting insulating member 64 for connecting the first insulating member 61 and the second insulating member 62 is formed so as to cover the glass tube 11.
On the other hand, an electrode exposed portion 21S is formed in the electrode 21 corresponding to the opening hole H.
[0021]
Here, the insulating tube 63A covers at least 1 mm of the one end 21A of the electrode, and the electrode covering distance L1 shown in the figure is, for example, 1.0 mm to 6.0 mm.
The opening hole H is formed by punching a predetermined portion of the insulating tube. The shape of the opening hole H is appropriate such as an oval shape or a rectangular shape, and the size thereof is 3.5 mm to 4.5 mm in the electrode length direction, and the width direction. It is good to set it as 1.5 mm-2.0 mm.
[0022]
Furthermore, in the rare gas discharge lamp according to the present invention, when the glass tube is covered with a heat-shrinkable insulating tube or the like from the lead wire joint portion, the insulation property is greatly improved, and the lead wire joint portion is improved. The adhesion between the lead wire and the electrode in the vicinity is increased, which is more preferable.
[0023]
According to the present invention described above, even if the electrode is pulled at the joint portion of the lead wire, both side portions of the joint portion in the electrode length direction are more firmly formed by the first and second insulating members. Since it is fixed, it is difficult for the electrode to be peeled off and the electrode to be deformed. Therefore, it is possible to provide a rare gas discharge lamp having high mechanical strength in the vicinity of the lead wire joint and good productivity. Still further, the present invention provides a rare gas discharge lamp that can prevent a gap from being formed between an electrode and a glass tube, and can obtain a predetermined illuminance distribution without forming a dark portion during lighting. It becomes possible. Therefore, as a result, it is possible to provide a rare gas discharge lamp that is easy to manufacture and can obtain a desired light distribution while having good productivity and is suitable as a light source for document illumination. It becomes like this.
Furthermore, according to the present invention, since the tensile strength of the lead wire can be increased, it is possible to provide a rare gas discharge lamp that is easy to manufacture and has high productivity, and can be made compact.
[0024]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above contents and can be changed as appropriate. For example, it is sufficient for a pair of electrodes to have at least a dielectric layer and a discharge space between both electrodes. One electrode is on the outer surface of the glass tube and the other electrode is on the inner surface of the glass tube. It is also possible to arrange.
Further, the present invention is not limited to the electrode having a narrow width but can be applied to a relatively large electrode. In such a case, a terminal member may be disposed between the lead wire and the electrode for electrical connection.
[0025]
【Example】
The rare gas discharge lamp according to the configuration of the present invention shown in FIGS. 1 and 2 was manufactured according to the following procedure with various changes in the distance L1 with which the first insulating member covered the electrode. Glass tubes with tube diameters of 4 mm and 5 mm were used.
An aluminum foil having a thickness of 0.5 mm, a length of 358 mm, and a width of 1.5 mm was attached to a glass tube having a total length of 360 mm to constitute an electrode. The electrode was mounted on one end side so that the distance L1 covering the electrode by changing the length of the insulating tube for the first insulating member was in the range of 0.1 mm to 6 mm. In addition, the insulating tube for the second insulating member is covered with the other end portion of the electrode so that the length S of the separation portion (electrode exposed portion) from the first insulating member is 3.5 mm (constant). It was attached. Thereafter, the glass tube on which the electrode and the insulating tube were mounted was heated to 150 to 200 ° C., and the first and second insulating members were disposed.
A lead wire having a wire length of about 1 mm was joined to the portion where the electrode was exposed at a portion where the first and second insulating members were separated from each other by aluminum solder.
In the above manufacturing process, the soldering operation can be easily performed, and the workability is very good without the electrodes being peeled off or deformed.
[0026]
[Comparative Example 1]
Comparative Example 1 according to the same procedure as in the above example except that the length L1 of the portion where the first insulating member covers the electrode is 0 mm (that is, the first insulating member is not disposed). A noble gas discharge lamp was manufactured. The insulating tube for the second insulating member is mounted so as to cover from the one end of the electrode to the other end side of the electrode from the required distance to the other end of the electrode. A second insulating member was disposed by exposing 3.5 mm.
A lead wire having a wire length of about 1 mm was joined to the portion where the electrode was exposed at one end of the electrode by aluminum solder.
In the manufacturing process described above, many electrodes were peeled off during the soldering operation. Also, one end of the electrode was easily peeled off, and the electrode was peeled and deformed during the handling of the lead wire in the subsequent manufacturing process.
[0027]
[Comparative Example 2]
A rare gas discharge lamp having a tube diameter of φ3 to φ5 mm was manufactured according to the following procedure in the manner of manufacturing a rare gas discharge lamp according to the prior art, that is, the procedure of first joining lead wires to electrodes and then covering the insulating tube.
An electrode was constructed by attaching an aluminum foil having a thickness of 0.5 mm, a length of 358 mm, and a width of 1.5 mm to a glass tube having a total length of 360 mm.
Next, a lead wire was joined with aluminum solder on the electrode at a position 3.5 mm away from one end of the electrode.
In the above manufacturing process, there are many cases where the electrode is distorted and peeled off during the soldering operation, and the electrode comes off during the operation after the lead wire is connected. Thus, the conventional rare gas discharge lamp has a high defect occurrence rate during the manufacturing process and has a problem in productivity.
[0028]
[Experimental example]
With respect to the rare gas discharge lamps according to the above Examples, Comparative Examples 1 and 2, the tensile strength of the lead wires was measured. Here, “the tensile strength of the lead wire” is the maximum tension when the lead wire is broken due to breakage of the lead wire joint portion, deformation of the electrode, or the like. In this experimental example, a load measuring device was attached to the lead wire, and the lead wire was pulled in a direction parallel to the tube axis.
[0029]
The results of the above experimental example are shown in FIG.
FIG. 4 is a diagram showing the relationship between the distance (L1 (mm) in FIG. 1) at which the first insulating member covers the electrode and the tensile strength (unit: N) of the lead wire showing the results of the above experimental example. is there. In FIG. 4, the average value of the measured values of the tensile strength (N) in the discharge lamps of the example and the comparative example 1 is given, and the approximate curve is drawn. Table 1 below shows average values obtained by measuring the tensile strength of lead wires for the rare gas discharge lamp of the comparative example.
[0030]
[Table 1]

[0031]
As a result of Table 1, when the electrode to which the lead wire is connected is not covered with the insulating member, the tensile strength of the lead wire is about 2.98 N when the tube diameter is 5 mm, and 1.96 when the tube diameter is 4 mm. When the tube diameter was 3 mm, it was 0.98 which was less than 1N.
Thus, if the tensile strength is small, there is a very high probability of being defective during manufacture, and mass production is impossible. In addition, according to this experimental example, the present inventors have detected that if the tensile strength of the lead wire is 5N or more, preferably 8N or more, more preferably 10N or more, it is difficult to cause defects in the electrode during the handling of the lead wire. Got.
[0032]
As shown in FIG. 4, when the electrode coating length was 1 mm, the lead wire had a tensile strength of 10 N or more when the tube diameter was 5 mm, and it was confirmed that sufficiently high mechanical strength was obtained. Moreover, it turned out that the intensity | strength 3 times or more comes to be obtained compared with what the electrode which concerns on the comparative example 2 is not coat | covered with an insulating member at all. Furthermore, even when the tube diameter was 4 mm, it was found that the lead wire tensile strength could be increased to 8 N or more when the electrode coating length exceeded 1 mm.
[0033]
In addition, when the coating length of the electrode according to Comparative Example 1 is 0 mm, a slight strength improvement is recognized as compared with that according to Comparative Example 2, but the tensile strength of the lead wire is less than 5N. In actual work, the occurrence rate of defects was high and was not practically usable.
[0034]
As described above, according to the rare gas discharge lamp in which the lead wire joint is formed between the first insulating member and the second insulating member according to the present invention, the tensile strength of the lead wire can be increased. It has been found that the tensile strength of the lead wire can be increased and the productivity is good.
Furthermore, it has been found that when the electrode coating length is 1 mm or more, a strength as high as 8 N or more can be obtained.
[0035]
【The invention's effect】
As described above, according to the present invention, even if the electrode is narrow, the adhesion strength between the electrode and the glass tube is high, the lead wire can be easily routed, and a problem occurs in the lead-out portion for feeding the electrode. It is difficult to provide a rare gas discharge lamp.
As a result, it is possible to provide a rare gas discharge lamp with good productivity while realizing a compact rare gas discharge lamp.
[Brief description of the drawings]
FIG. 1 is a sectional view in the tube axis direction of a rare gas discharge lamp according to a first embodiment of the present invention.
2 is a cross-sectional view of a rare gas discharge lamp cut along a line AA in FIG. 1. FIG.
FIG. 3 is a diagram illustrating an embodiment of the present invention.
FIG. 4 is a diagram showing the relationship between the distance L1 and the tensile strength of a lead wire, showing the results of an experimental example.
[Explanation of symbols]
11 Glass tube 11A One end 11B The other end 21 One electrode 21A One end 21B The other end 22 The other electrode 22A One end 22B The other end 21S, 22S Electrode exposed portion 30 Phosphor layer 40 Aperture 50 Lead wire 51 Solder 52 Lead wire joint portion 61 First insulating member 62 Second insulating members 61A, 62A, 63A Insulating tube 64 Insulating member S for connecting S Separated portion H Opening hole

Claims (3)

A glass tube filled with a rare gas, one electrode made of a metal member extending in the length direction of the glass tube formed on the outer surface of the glass tube, and a power supply joined to the one electrode A lead wire, and the other electrode disposed through the one electrode and at least one dielectric,
The one electrode is covered with a first insulating member and a second insulating member which are separated from each other in the length direction of the electrode on the electrode and are made of a heat-shrinkable tube .
A rare gas discharge lamp, wherein a lead wire joint is formed on an electrode exposed at a separation portion between the first insulating member and the second insulating member. Rare gas discharge lamp of claim 1 wherein said first insulating member and the second insulating member and the connecting insulating member for connecting is formed wherein Rukoto.   The rare gas discharge lamp according to claim 1 or 2, wherein the first insulating member and the second insulating member cover the one electrode in the length direction by 1 mm or more.

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