CN1142459C - Discharge tube and back projecting lamp using same and making method thereof - Google Patents

Abstract

The present invention relates to a discharge tube and back projecting lamp using same and making method thereof. The composition of the discharge tube includes a luminotron made of light permeability material and a sealed tube of the discharge electrode formed in the connecting joint in the orthogonal direction with at least one end of the luminotron. The manufacturing method of the discharge tube is: connecting the sealed tube and the luminotron using the junction material, first covering the outside double end of the luminotron with lower melting point junction material than the said sealed tube and the luminotron, then, inserting the double end of the luminotron into the tube through the holes on the sealed tube, thereafter, melting the junction material with the temperature higher than the melting point of the junction material and lower than the sealed tube and the luminotron and solidifying it. The invention is suitable for manufacturing the thin pipe diameter of the LCD, prevents the irradiance loss and uneven brightness to make the back projecting lamp miniaturization.

Description

The back of the body illuminator and the manufacture method thereof of discharge tube and this discharge tube of use

Technical field

The present invention relates to the back of the body illuminator and the manufacture method thereof of discharge tube and this discharge tube of use, the especially relevant discharge tube that is suitable for the back of the body illuminator of penetrating type display board with light source.

Background technology

In the past, in the penetrating type display board that uses on notebook computer etc., the liquid crystal cells back side is provided with back of the body illuminator, utilization shows from penetrating type displaying plate face irradiation the light from the there, but in recent years, because the requirement of miniaturization and weight reduction needs the caliber of discharge tube is run business into particular one.

Yet, use is to form luminescent coating on for the inwall at pipe at the existing discharge tube of the back of the body on the illuminator, mercury vapor is enclosed and the fluorescence discharging tube that forms by portion within it, in order to form luminescent coating in pipe inside, need extra heavy pipe footpath to a certain degree, external diameter is accomplished below the 1.8mm.

Therefore, as shown in figure 26, in the existing discharge tube 100 of the thick light guide plate side of 2.0mm configuration, toward light guide plate 135 directions with the light of external exposure after by reflection horizon 150 reflections around discharge tube 100, decay generation loss by in the discharge tube 135 time again.Know that as its object lesson if to use the incident efficient under the 2.0mm diameter discharge tube situation to be benchmark on the light incident side 2.2mm thick light guiding plate, so, the incident efficient of 1.8mm diameter discharge tube increases by 15%, also will increase below this.Therefore, in order to improve incident efficient, light guide plate 2.0mm must make the external diameter minor diameter discharge tube also littler than 1.5mm relatively.

Also have, an example as discharge tube making method, as shown in figure 25, at first on forming the two ends of glass body 112 of luminescent coating, inwall places sparking electrode 120, connect the pipe 112 that is used to enter mercury getter 149 in pipe central authorities simultaneously, then, the two ends of sealed tube body 112, vacuumize by managing 112 parts, import discharge gas, the front end of sealed tube 112, these are known, but, from mercury getter 149 mercury vapor is imported the inside of body 112, last, implementing the method for sealed tube 113 with the coupling part of body 112, in this case, processing generation distortion and the luminescent coating of shutting pipe 113 at the discharge tube middle body are irregular, worry that generation brightness is inconsistent.

So in order to solve the described problem that resembles, the present invention's first purpose mainly provides a kind of such discharge tube and manufacture method thereof, should be applicable to that the caliber of LCD is done carefully, and, prevent luminous loss, do not worry taking place the brightness disproportionation problem; Particularly, the miniaturization of the discharge tube when being applied to carry on the back illuminator.

The example of in Figure 27, showing existing other ultraviolet discharge pipes 60 below.This discharge tube 60 has: the close property of gas container 66, comprising, tube body 62, penetrate by the ultraviolet ray of elongated quartz glass etc. that glass is formed and sealing 64, and form by the both ends open of this tube body 62 of melt-sealed; Pair of discharge electrodes 68 is configured in respectively near the sealing 64 in this airtight container.In the tube body 62 of airtight container 66, fill the discharge gas during ultraviolet ray produces.

Sparking electrode 68 is made up of the tungsten of cardinal principle funnel, and leading section exposes in airtight container 66 tube bodies 62, and simultaneously, base end part is welded on the molybdenum foil of imbedding in airtight container 62 sealings 64 70.One end of the lead terminal of being made up of tungsten 72 also is connected on this molybdenum foil 70.Also have, the other end of lead terminal 72 is directed to the outside of airtight container 66.

Like this, in existing discharge tube 60, imbedding molybdenum foil 70 reasons in sealing 64 is, the ultraviolet ray of the quartz glass of formation airtight container 66 etc. penetrates the fusing point very high (for example the fusing point of quartz glass is more than 2000 degree) of glass, therefore, the ultraviolet ray that the fusing point of enclosing the metal in the sealing 64 must be higher than above-mentioned quartz glass etc. penetrates the fusing point of glass, so that its both ends open at fusing tube body 62 can not melt when forming sealing 64.

As the fusing point metal higher than the fusing point of above-mentioned glass, molybdenum and tungsten etc. are for example arranged, but, because the thermal expansivity of these metals and ultraviolet ray penetrate the thermal expansivity of glass obvious different (for example the thermal expansivity of molybdenum and tungsten is tens of times of thermal expansivity of quartz glass), so when enclosing these metals in the sealing 64, because above-mentioned difference of thermal expansion coefficients is worried to crack on sealing 64 (be full of cracks).

Therefore, past, by extremely thin molybdenum foil 70 is embedded in the sealing 64, reduce because metal such as molybdenum and ultraviolet ray penetrate the influence that the difference of thermal expansion coefficients of glass produces, prevent from sealing 64, to crack the discharge gas that causes in the tube body 62 to external leaks.

Suitable speech, by as mentioned above, the base end part of the sparking electrode 68 that is made of tungsten and an end of lead terminal 72 are all imbedded in the sealing 64, so, with the sealing 64 of the base end part joining part of the sparking electrode of imbedding 68, sealing 64 with the lead terminal 72 1 end joining parts of imbedding, although because of tungsten and the difference of thermal expansion coefficients that ultraviolet ray penetrates glass crack, but, do not crack with the sealing 64 of above-mentioned molybdenum foil 70 joining parts, owing to be adjacent to contact condition for 70 one-tenth with molybdenum foil, the discharge gas in the tube body 62 does not spill to the outside.

In existing discharge tube 60, as mentioned above, in order to prevent that ultraviolet ray because of the quartz glass that constitutes sealing 64 etc. from penetrating glass and constituting the crackle that the difference of thermal expansion coefficients between the metal of tungsten etc. of sparking electrode 68 produces, must in sealing 64, enclose molybdenum foil 70, this makes discharge tube 60 become big, and the hope that requires with the miniaturization of discharge tube 60 is opposite.

Therefore, second purpose of the present invention and first purpose associated, realization can make the small-sized discharge tube of sealing contraction in length.

Summary of the invention

In order to achieve the above object, a kind of discharge tube of the present invention is characterized in that, have the luminotron formed by translucent material and with the direction configuration that is orthogonal substantially of the both ends open of this luminotron, enclose the sealed tube of the sparking electrode that connected state is connected to form simultaneously; Described sealed tube has first sealing, second sealing of tube body and this tube body both ends open formation of sealing, and the outside of second sealing forms the general plane shape, and simultaneously, described luminotron is connected near the tube body of the position of described second sealing.More particularly, this discharge tube becomes connected state to be connected to form at the luminotron two ends, make a pair of sealed tube of enclosing sparking electrode become the H font to arrange substantially, simultaneously, clamp the connecting portion with the luminotron of one sealed tube at least, set getter material in advance in the part relative with sparking electrode, then, after the inside of sealed tube and luminotron is evacuated, remove the sealed tube part of the above-mentioned getter material of configuration, seal shaping.

The luminotron of the discharge tube of such shaping can make external diameter do carefullyyer than sealed tube.At external diameter is that 1.5～1.0mm tubule the inside is difficult to apply equably luminescent coating, and simultaneously, the manufacture method itself of being pumped into high vacuum is also difficult.So, resembling under this small-bore situation, resemble the present invention and form luminescent coating in the luminotron outside, connecting the external diameter of enclosing sparking electrode at its two ends is the normally used pipe of 3～4mm, and can obtain the illuminating part external diameter is 1.5～1.0mm and the suitable discharge tube that does not have dark portion (black area).

And, use the back of the body illuminator of discharge tube of the present invention, at least have light guide plate, with above-mentioned discharge tube, in more detail, it is characterized in that, dock second sealing outside of described each sealed tube of discharge tube of configuration respectively at the both ends of described light guide plate one end face, simultaneously, both ends light guide plate one end face in addition along described second sealing of butt joint configuration outside disposes described luminotron.

In described discharge tube, in case discharge between sparking electrode, then the visible light of discharge generation not only in luminotron, also takes place in tube bodies for packaging tubes portion, and the visible light that produces in this tube body can be from tube body and the radiation of second sealing.

Therefore, in back of the body illuminator, butt joint is disposed outside second sealing of described each sealed tube of discharge tube respectively on the two ends of light guide plate one end face, simultaneously, disposed two ends light guide plate one end face in addition of second sealing along butt joint, by disposing described luminotron, make the both sides of the luminotron of discharge tube and sealed tube configurable in the two ends of light guide plate one end face.And, owing to the both ends of visible light directive light guide plate one end face that radiates from sealed tube second sealing, from the above-mentioned both ends of a visible light directive end face in addition of luminotron radiation, so, can be by the total length incident visible light of light guide plate one end face.

In addition, in above-mentioned discharge tube, the outside of second sealing becomes the substantitally planar shape, and simultaneously, luminotron is connected with tube body in the nearby position of second sealing, so the second sealing outstanding length outstanding from the luminotron outer end diminishes, therefore, under the situation of docking configuration second sealing outside with light guide plate one end face, can with an end face of light guide plate near the state configuration luminotron, therefore, can make from the visible light efficient of luminotron radiation incide in the light guide plate.

And, in discharge tube sealing of the present invention, it is characterized in that, have: airtight container, penetrating by ultraviolet ray on the tube body both ends open that glass forms, engage a pair of sealing of forming by soft glass and form; And pair of discharge electrodes, in above-mentioned sealing, enclose base end part, simultaneously, leading section is exposed in described tube body; Use discharge gas with the ultraviolet ray generation, be filled in the described airtight container.

In discharge tube of the present invention, constitute the sealing of enclosing sparking electrode with soft glass, this soft glass is owing to the thermal expansivity that penetrates glass than ultraviolet ray is big, so when enclosing sparking electrode in the sealing, can not crack because of the difference of the thermal expansivity of the thermal expansivity of soft glass and sparking electrode.Thereby, in discharge tube of the present invention, do not need in the existing discharge tube in order to prevent that the difference of thermal expansion coefficients that penetrates the metal of glass and formation sparking electrode because of the ultraviolet ray that constitutes sealing from cracking the molybdenum foil of enclosing in the sealing, like this, the length of existing discharge tube sealing can be shortened, thereby the miniaturization of discharge tube can be realized.

In addition, the present invention also provides the manufacture method of the discharge tube with said structure. descend the record explanation of embodiment according to this about manufacture method of the present invention and other characteristic roots.

Description of drawings

Fig. 1 is the key diagram of expression first embodiment of the invention discharge tube and back of the body illuminator;

Fig. 2 is an expression first embodiment of the invention discharge tube making method key diagram;

Fig. 3 is the key diagram of expression second embodiment of the invention discharge tube;

Fig. 4 is the key diagram that expression second embodiment of the invention discharge tube and back of the body illuminator make use-case;

Fig. 5 is the cut-open view that the present invention carries on the back illuminator;

Fig. 6 is an expression second embodiment of the invention discharge tube making method key diagram;

Fig. 7 is an expression second embodiment of the invention discharge tube making method key diagram;

Fig. 8 is an expression second embodiment of the invention discharge tube making method key diagram;

Fig. 9 is an expression second embodiment of the invention discharge tube making method key diagram;

Figure 10 is the key diagram that expression third embodiment of the invention discharge tube and back of the body illuminator make use-case;

Figure 11 is the key diagram of expression fourth embodiment of the invention discharge tube;

Figure 12 is expression and the discharge tube associated use encapsulant connecting pipe body of fourth embodiment of the invention and the major part amplification view under the sealing situation;

Figure 13 is the amplification view that the expression and the discharge tube associated of fourth embodiment of the invention are used major part under lamination structure encapsulant connecting pipe body and the sealing situation;

Figure 14 is the discharge tube key diagram of expression fifth embodiment of the invention;

Figure 15 is an expression fifth embodiment of the invention discharge tube making method key diagram;

Figure 16 is an expression fifth embodiment of the invention discharge tube making method key diagram;

Figure 17 is an expression fifth embodiment of the invention discharge tube making method key diagram;

Figure 18 is an expression fifth embodiment of the invention discharge tube making method key diagram;

Figure 19 is an expression fifth embodiment of the invention discharge tube making method key diagram;

Figure 20 is the key diagram of expression sixth embodiment of the invention discharge tube;

Figure 21 is an expression sixth embodiment of the invention discharge tube making method key diagram;

Figure 22 is an expression sixth embodiment of the invention discharge tube making method key diagram;

Figure 23 is an expression sixth embodiment of the invention discharge tube making method key diagram;

Figure 24 is the key diagram that expression sixth embodiment of the invention discharge tube and back of the body illuminator make use-case;

Figure 25 is the manufacture method key diagram of the existing discharge tube of expression;

Figure 26 is the cut-open view of existing back of the body illuminator;

Figure 27 is the key diagram of the existing discharge tube of expression.

Embodiment

Fig. 1 represents first embodiment of the invention.Here, represent that simultaneously this figure is the major part schematic cross sectional views of an expression one example the example of discharge tube of the present invention as the use of back of the body illuminator, the discharge tube 10 and the light guide plate 35 that are used as light source constitute.

The ultraviolet ray that above-mentioned discharge tube 10 has by an elongated quartz glass etc. penetrates the luminotron 12 that glass is formed, with on the both ends open of this luminotron 12 with described luminotron 12 roughly the state of being orthogonal be connected a pair of sealed tube of forming with soft glass 14.Described luminotron 12 is along the end face configuration of light guide plate 34, and simultaneously, described a pair of sealed tube 14 disposes along the end face with an end face quadrature that disposes described luminotron 12.

Described sealed tube 14 has straight tube-like tube body 16 and fusing and seals a pair of sealing 18,19 that these tube body 16 both ends opens form.In the sealing 18 of one, enclose the part of sparking electrode 20 and lead terminal 22.Then, the leading section of described sparking electrode 20 is outstanding to sealing 18, exposes in body 16, and simultaneously, an end of the lead terminal 22 that base end part is interior with being embedded in sealing 18 is connected.And the other end of described lead terminal 22 is outstanding to sealing 18 outsides.

The hole 26 of the onesize diameter of the internal diameter of formation and described luminotron 12 cardinal principle on the tube body 16 of described sealed tube 14, make this hole 26 consistent with the internal diameter of luminotron 12, state with sealed tube 14 and luminotron 12 connections, the end face of the both ends open of luminotron 12 is engaged with the outside of sealed tube 14, constitute airtight container 28 with this.

In described airtight container 28, fill the discharge gas that ultraviolet ray produces usefulness.Also have among the figure and done omission, be covered with fluorophor in the outside of described luminotron 12.

And, if on discharge tube 10, apply voltage, then discharge electronics and ultra violet radiation gas percussion, the ultraviolet ray of radiating various wavelength 20 of sparking electrodes by pair of lead wires terminal 22.

The ultraviolet ray of radiation sees through with ultraviolet ray and penetrates the luminotron 12 that glass constitutes, and is activated at the fluorophor that luminotron 12 outsides are covered with, and produces visible light.This visible light forms towards the light that is configured in the not shown penetrating type display board side in light guide plate 35 tops by described light guide plate 35 scattered reflections.

In described discharge tube 10, only dispose luminotron 12 along an end face of light guide plate 35, owing to have configuration not to be helpless to the sealing 18 of visible light generation, so can guarantee the amount of the visible light of more directive light guide plate 35 1 end face sides.And the luminotron 12 of discharge tube 10 and sealed tube 14 state of being orthogonal substantially are connected and since sealed tube 14 along with the end face configuration of the light guide plate 35 1 end face quadratures of the described luminotron 12 of configuration, so can seek to carry on the back the miniaturization of illuminator profile.

The manufacture method of Fig. 2 (a)～Fig. 2 (c) expression discharge tube 10 of the present invention.At first, a pair of sealed tube 14 that inside is inserted sparking electrode 20 is partitioned into state configuration side by side, and the two ends of luminotron 12 are connected with each cardinal principle middle body of these 2 sealed tubes 14.With sparking electrode 20 opposition sides of one sealed tube 14 on configuration mercury getter 49, simultaneously, shown in Fig. 2 b, sealing removes 3 places, end of the sealed tube 14 of another root sealed tube 14 front ends.Then, inside is vacuumized, simultaneously, encloses discharge gas from the front end of sealing pipe 14, from the junction sealing of luminotron 12.

And, from mercury getter 49 mercury vapor being imported in the luminotron 12, the sealed tube 14 of one seals from the coupling part with luminotron 12.Under luminescent coating situation outside, on the outer peripheral face of luminotron 12, directly apply fluorophor powder, or with fluorophor powder sneak into the band cementability bonding agent apply, or stir into fluorophor, on the surface topped covering fluorescent membrane Fluoropher thin film, set luminescent coating, finish discharge tube 10 of the present invention like this.

Like this, as shown in Figure 1, in discharge tube 10 of the present invention, can only dispose the luminotron 12 that does not have dark portion (black area) at light guide plate 35 light incident sides, can be for the quality irradiation optimal light of light guide plate 35 with no brightness disproportionation, simultaneously, by at light guide plate 35 sides configuration sealed tube 14, can on the sidepiece of light guide plate 35, hold efficient ground configuration sealed tube 14 by height.

Also have, between a pair of sealed tube of enclosing sparking electrode, connected state connects the external diameter luminotron thinner than sealing pipe, in sealed tube, set getter material in advance, then, after making sealed tube and luminotron inside be in vacuum state, seal the sealed tube part of configuration getter material, can make luminotron do carefullyyer, can avoid existing and seal the brightness disproportionation that the pipe facial disfigurement that takes place causes in discharge tube central authorities because of the pipe that will dispose gettering material than sealed tube.

And, because a pair of sealed tube bends to the right angle state with respect to being in its middle luminotron, back of the body illuminator light guide plate in LCD only disposes luminotron on one side, obtains not having the optimal light irradiation of brightness disproportionation, can hold efficient ground configuration sealed tube at light guide plate side height.

Luminotron is enclosed mercury vapor in inside, on the pipe face, form luminescent coating, whereby, ultraviolet ray exited luminescent coating by discharge generation between sparking electrode, can obtain optimal luminescent, and, luminescent coating formed in the luminotron outside, compare with the situation that forms luminescent coating inside, luminotron is done it thinly.

Fig. 3 is the cut-open view of second embodiment of the invention.

Discharge tube 10 is provided with: luminotron 12 is made by the horminess glass tube with ultraviolet through characteristic; With a pair of sealed tube 14, on the both ends of this luminotron 12 12a, 12b with described luminotron 12 roughly the state of being orthogonal be connected, by as forming with the hard glass with ultraviolet through characteristic of described luminotron 12 same materials.

Sealed tube 14 has first sealing 18, second sealing 19 of straight tube-like tube body 16 and this tube body 16 both ends opens formation of melt-sealed, a part of enclosing sparking electrode 20 and lead terminal 22 in first sealing 18.Then, the leading section of described sparking electrode 20 is projected into beyond first sealing 18, exposes in tube body 16, and simultaneously, base end part is connected with a end of lead terminal 22 in being embedded in first sealing 18.Also have, the other end of described lead terminal 22 is outstanding outside first sealing 18.

And the outside 19a of second sealing 19 roughly becomes the plane.

Have again, in described luminotron 12 left and right sides both ends 12a, 12b, insert cylindrical body 24,24 respectively.This cylindrical body 24 is by having than the hard glass that constitutes luminotron 12 (fusing point is about 800 degree) fusing point height and tool translucent material quartz glass formations such as (about 2000 degree of fusing point).Like this, by have translucent material as quartz glass constitute as described in tubular body 24, cylindrical body 24 does not cover ultraviolet luminous from luminotron 12, can not cause the minimizing of luminotron 12 light-emitting areas.

Have again,, also can use than opaqueness materials such as high pottery of the hard glass fusing point that constitutes described luminotron 12 and aluminium as the material that constitutes described cylindrical body 24.In this case, for the minimizing of the light-emitting area of controlling luminotron 12 as much as possible, be preferably in the length that shortens cylindrical body 24 in the possible limit.

In addition, described cylindrical body 24 its parts also can be given prominence to the state insertion configuration of some from end 12a, the 12b of described luminotron 12.

Form in the nearby position of second sealing 19 of the tube body 16 of described sealed tube 14 and the described luminotron 12 external diameters hole 26 of same diameter substantially, from this hole 26 in the end 12a of described luminotron 12, the 12b tubular stinger body 16, so that luminotron 12 and tube body 16 form the state that is communicated with, utilization is engagement end portion 12a, 12b outside and sealed tube 14 on luminotron, constitutes airtight container 28.

As mentioned above, the outside 19a of second sealing 19 roughly becomes the plane, simultaneously, near luminotron 12 position second sealing 19 is connected with tube body 16, so, only be equivalent to the wall thickness of second sealing 19 from the outstanding length of the second outstanding sealing 19 of luminotron 12 outer end 12c, do minimumly.

Also have, in the displaying of drawing, although emphasize from the outstanding length of the second outstanding sealing 19 of luminotron 12 outer face 12c,, in fact, because the external diameter of luminotron 12 is 1～2mm, so described outstanding length does not exceed a micron unit.In described airtight container 28, fill the discharge gas that produces usefulness as ultraviolet ray, for example mix the ultra violet radiation gas that forms with argon and mercury, or based on the ultra violet radiation gas of xenon.And, not shown, on the 19a of second sealing outside of described luminotron 12 outsides and sealed tube 14, be covered with fluorophor.

Fig. 4 is to use the cut-open view of the back of the body illuminator 32 of described discharge tube 10.This back of the body illuminator 32 has as described first discharge tube 10 of light source and the rectangular light guide plate 35 of transparent acrylic resin system.As shown in Figure 5, the surface engagement light diffusing sheet 36 of described light guide plate 35 simultaneously, engages light reflecting board 38 overleaf.

Second sealing, the 19 outside 19a of each sealed tube 14 of both ends butt joint configuration of one end face of described light guide plate 35, and, the end face configuration luminotron 12 beyond the both ends of described second sealing, the 19 outside 19a of edge butt joint configuration.Its result, the luminotron 12 of discharge tube 10 and the both sides of sealed tube 14 are configured in the two ends of light guide plate 35 1 end faces.

In addition, as mentioned above, minimum from second sealing, the 19 outstanding length that luminotron 12 outer end 12c are outstanding, so, second sealing, 19 outside 19a are docked with an end face of light guide plate 35 under the situation of configuration, can make the approaching configuration of luminotron 12 and light guide plate 35 1 end faces.Therefore, can make from the visible light efficient of luminotron 12 radiation incide in the light guide plate 35.

Then, in case on first discharge tube 10, apply voltage by pair of lead wires terminal 22, so, discharge 20 of sparking electrodes, in luminotron 12 and in the tube body 16 of sealed tube 14, electron impact is radiated the ultraviolet ray of various wavelength to ultra violet radiation gas.The ultraviolet ray exited fluorophor that are covered with in luminotron 12 outsides of radiation in the luminotron 12, the radiation visible light, the surface feeding sputtering from the visible light of these luminotron 12 radiation from described light guide plate 35 is in this light guide plate 35.And, the ultraviolet ray exited fluorophor that on the 19a of second sealing outside, is covered with of radiation in the tube body 16 of sealed tube 14, the radiation visible light, the visible light that radiates from this second sealing 19 also incides in this light guide plate 35 from the both ends of described light guide plate 35.Its result can be by the total length incident visible light of light guide plate 35 1 end faces.

Visible light in the incident light guide plate 35 is advanced in light guide plate 35 internal reflections, and the visible light of directive light guide plate 35 rear side reflexes to face side by light reflecting board 38, so, from the whole zone radiation visible light on light guide plate 35 surfaces.Utilize light diffusing sheet 36 diffusions from the visible light of these light guide plate 35 surface radiation, become light towards the not shown penetrating type display board side that is configured in light guide plate 35 tops.

The manufacture method of described first discharge tube 10 then, is described according to Fig. 6 to 9.At first, connect sparking electrode 20 and lead terminal 22 in advance, this sparking electrode that connects 20 and lead terminal 22 are inserted in the horminess glass tube 41 from the horminess glass tube 41 1 distolateral openings as sealed tube 14 bases.At this moment, the other end of described lead terminal 22 is configured to outside described horminess glass tube 41 outstanding.

Under this state, after the end of the insertion sparking electrode 20 of the described horminess glass tube 41 of heat fused and lead terminal 22 sides,, form described first sealing 18 by making it cooled and solidified.

Then, the hole 26 of formation and the roughly the same bore of luminotron 12 external diameters on the tube body 16 of horminess glass tube 41.

This hole 26 can be by the tube body 16 of heating horminess glass tube 41, and the gas that blows into nitrogen or air etc. under the state after softening forms.

Perhaps, by irradiating laser line on the tube body 16 of horminess glass tube 41, make the described hole 26 of hard glass evaporation also can formation that constitutes tube body 16.In this case, shine on the tube body 16 at rear of hole 26 formation place that are positioned at tube body 16, must will block the blocking in the parts tubular stinger body 16 of laser rays in order to prevent laser rays.

Also have, also can simultaneously, flowing through the ultrasound wave that applies waterborne of hole 26 formation place, cut tube body 16 by the grains of sand in the water and form by making the water that contains small sand grains in described tube body 16 surperficial continuous flows in described hole 26.

In addition, use the tube body 16 of microburner fusing horminess glass tube 41, also can form described hole 26.

Also have, when using laser rays to form the method in hole 26, make the water that contains small sand grains do the sound wave vibration and form under the method situation in hole 26, the shape in hole 26 and size are than being easier to control.

Then, in the end of described luminotron 12 12a, 12b, insert after the described cylindrical body 24 of configuration, as shown in Figure 7, the end 12a of luminotron 12 is inserted in the tube body 16 of horminess glass tube from described hole 26, luminotron 12 and horminess glass tube 41 are communicated with.

Then as shown in Figure 8, utilize burner 42 with fusing point height than the hard glass that constitutes described luminotron 12 and horminess glass tube 41, and near the hole 26 of described cylindrical body 24 low-melting temperature heating luminotron 12 end 12a and horminess glass tube 41, after luminotron 12 and horminess glass tube 41 both fusings, make cooling curing, make luminotron 12 and horminess glass tube 41 solder joints.As mentioned above, constitute luminotron 12 and sealed tube 14, so both thermal expansivity equate that connectivity is fabulous with same hard glass.

After on the both ends of luminotron 12 12a, 12b, engaging horminess glass tube 41 respectively, by not shown exhaust apparatus, from another distolateral gas discharge that makes in horminess glass tube 41 and the luminotron 12 of horminess glass tube 41, behind the formation high vacuum state, fill ultra violet radiation gas.Then, as shown in Figure 8, nearby another of horminess glass tube 41 of position is distolateral with burner 32 heat fused holes 26, and seal, more as shown in Figure 9, in the other end rear flank of pressurization horminess glass tube 41, by cooling curing, form described second sealing 19 that its outside 19a becomes the general plane shape.

At last, if on the 19a of second sealing outside of the outside of luminotron 12 and sealed tube 14, be covered with fluorophor, then finish discharge tube shown in Figure 3 10.

In above-mentioned manufacture method, in the end of luminotron 12 12a, 12b, insert the cylindrical body 24 that configuration uses the material higher than the hard glass fusing point that constitutes luminotron 12 to constitute, simultaneously, with hard glass fusing point height than formation luminotron 12 and sealed tube 14 (horminess glass tube 41), and than described cylindrical body 24 low-melting temperature heating, doing end 12a, 12b and sealed tube 14 electric smelting of luminotron 12 applies, when deposited, even if make end 12a, the 12b fusing of luminotron 12 also can not make cylindrical body 24 fusings.Therefore, can prevent to cause in end 12a, the 12b inaccessible because of luminotron 12 fusings or thermal deformation.And, because in the end 12a of luminotron 12,12b tubular stinger body 16, so also can prevent to melt or the sealed tube 14 of thermal deformation enters obturation in end 12a, the 12b that causes in end 12a, the 12b of luminotron 12.

Then, show the third embodiment of the present invention.The back of the body illuminator 32 of Figure 10 has as the discharge tube 10 of light source and the light guide plate that becomes rectangle substantially 35 of transparent acrylic resin system.

The outside 19a of second sealing 19 of described discharge tube 10 becomes dome shape substantially, and luminotron 12 is connected with tube body 16 at the lower position of second sealing 19, and this point is different with aforesaid discharge tube 10.Thereby in the discharge tube 10 of this embodiment, the part of tube body 16 and sealing 19 are outstanding from the outer end 12c of luminotron 12, and its outstanding length is longer than the outstanding length of the sealing outside 19a of described discharge tube 10.Also have, in the discharge tube 10 of this embodiment, the outside 19a of second sealing 19 not only, and also be covered with fluorophor in outside from the outstanding tube body 16 of the outer end 12c of luminotron 12.

Have, in the manufacturing process of Fig. 8 of the discharge tube 10 of this embodiment, another of the horminess glass tube 41 of usefulness burner 32 bottoming holes 26 top positions is distolateral, after sealing, keeps cooling curing to make again.

And, on the both ends, the left and right sides of light guide plate 35 1 end faces of carrying on the back illuminator 32, form rectangular slits 48, along an end face that does not form this otch 48, the luminotron 12 of butt joint configuration second discharge tube 46, simultaneously, the tube body 16 and second sealing 19 that configuration is given prominence to from luminotron 12 outer end 12c in described otch 48.Its result, both are configured in the luminotron 12 of discharge tube 10 and sealed tube 14 in the two ends of light guide plate 35 1 end faces.

Then, if apply voltage by pair of lead wires terminal 22 on discharge tube 10, then between sparking electrode 20 electric discharge phenomena take place, in luminotron 12 and in the tube body 16 of sealed tube 14, electron impact ultra violet radiation gas, the ultraviolet ray of radiating various wavelength.

The ultraviolet ray exited fluorophor that covers in luminotron 12 outsides of radiation in luminotron 12 produces visible light, and the visible light that radiates from this luminotron 12 never forms an end face of described otch 48 and injects in the light guide plate 35.And, the ultraviolet ray exited fluorophor that is covered with in second sealing outside 19a and tube body 16 outsides of radiation in sealed tube 14 tube bodies 16, produce visible light, also inject in the light guide plate 35 from an end face that forms otch 48 from the visible light of this second sealing 19 and tube body 16 radiation.Its result can inject visible light by an end face total length of light guide plate 35.

In above-mentioned, as the glass that constitutes luminotron 12 and sealed tube 14, although having exemplified the hard glass with ultraviolet through characteristic describes, but be not limited thereto, for example also can using, quartz glass etc. has the constituent material of the glass of ultraviolet through characteristic as described luminotron 12 and sealed tube 14.

And, cover fluorophor in tube body 16 the insides of luminotron 12 the insides and sealed tube 14, simultaneously, also can constitute luminotron 12 and sealed tube 14 with having translucent material.

In described discharge tube of the present invention, if discharge between sparking electrode, so consequent visible light and also produces in sealed tube body not only in luminotron, and the visible light that produces in this tube body can be from tube body and the radiation of second sealing.

Therefore, in the back of the body illuminator of the second embodiment of the invention that has described discharge tube and light guide plate, second sealing outside of described each sealed tube of discharge tube of butt joint configuration respectively on the two ends of an end face of light guide plate, simultaneously, dispose an end face of the two ends light guide plate in addition of second sealing along butt joint, by disposing described luminotron the luminotron of discharge tube and sealed tube are configured in the two ends of light guide plate one end face, therefore, can seek to carry on the back the miniaturization of illuminator profile.And, incide the both ends of light guide plate one end face from the visible light of second sealing of sealed tube radiation, owing to incide an end face beyond the described both ends, so but the total length incident visible light of the end face by light guide plate from the visible light of luminotron radiation.

Have again, in described discharge tube, second sealing outside becomes the substantitally planar shape, simultaneously, luminotron is because of being connected with tube body with position near second sealing, so the outstanding length of second sealing of giving prominence to from the luminotron outer end is little, therefore, dock under the situation about disposing making second sealing outside and leaded light become plate one end face, can with light guide plate one end face near the state configuration luminotron, the visible light that radiates from luminotron can incide in the light guide plate efficiently.

Also have, in the back of the body illuminator of third embodiment of the invention, both ends at light guide plate one end face form otch, dispose described discharge tube luminotron along an end face that does not form this otch, simultaneously, owing in described otch, disposed tube body and second sealing outstanding, in the two ends of an end face that the luminotron and the sealed tube of discharge tube can be configured in light guide plate, in the hope of the miniaturization of back of the body illuminator profile from described luminotron outer end.And, owing to incide an end face that does not form described otch, incide an end face of otch formation, so but pass through light guide plate one end face total length incident visible light from the visible light of sealed tube radiation from the visible light of luminotron radiation.

Then, show the 4th embodiment discharge tube.As shown in figure 11, discharge tube 10 of the present invention is on tube body 16 both ends opens that the quartz glass tube that penetrates glass as an elongated ultraviolet ray is formed, by engaging a pair of sealing of forming by soft glass 18, seal the both ends open of described tube body 16, constitute airtight container 28.

Described sealing 18 has tubulose teat 14a on the one end, its internal diameter of this tubulose teat 14a is done more somely greatly than the external diameter of described tube body 16.And, in described tubulose teat 14a, make the joint of tube body 16 and sealing 18 with the state that inserts described tube body 16 ends.

And, a part of on described each sealing 14, enclosing sparking electrode 20 and lead terminal 22.That is, described sparking electrode 20 leading sections are outstanding outside sealing 18, and simultaneously, an end of the lead terminal 22 that base end part is interior with being embedded in sealing 18 is connected.In addition, the other end of described lead terminal 22 is outstanding outside sealing 18.Then, on described tube body 16 both ends opens, engage sealing 18, constitute airtight container 28, under this state, the leading section of described sparking electrode 20 exposes in the tube body 16 of airtight container 28, and simultaneously, the other end of described lead terminal 22 is to airtight container 28 outside derivation.

In described airtight container 28, produce as ultraviolet ray and use discharge gas, fill the ultra violet radiation gas that for example argon and mercury mix composition, or based on the ultra violet radiation gas of xenon.

Then, if on discharge tube 10, apply voltage, so, be disposed at 20 generation discharges of 28 sealed at both ends 18 pair of discharge electrodes nearby of airtight container by pair of lead wires terminal 22, electron impact ultra violet radiation gas, the ultraviolet ray of radiating various wavelength.

The airtight container 28 of described discharge tube 10 is in order to the below manufactured.At first, connect sparking electrode 20 and lead terminal 22 in advance, the sparking electrode 20 of this connection and lead terminal 22 are inserted in the not shown soft glass pipe.At this moment, the another terminal of described lead terminal 22 is configured to outside described soft glass pipe outstanding.

Under this state, by with described soft glass pipe heat fused, cooling curing and form described sealing 18 again.At this moment,, stay the glass tube state, can form described tubulose teat 14a soft glass pipe one distolateral some amounts heat fused not.

Below, to insert respectively in the tubulose teat 14a of described sealing 18 with tube body 16 both ends that quartz glass tube is formed, with this state, if after heat fused near the sealing 18 tubulose teat 14a, cooling curing again, then can engage sealing 18 and tube body 16, form airtight container 28.

By above-mentioned, because on sealing 18, form and make its internal diameter tubulose teat 14a bigger than the external diameter of described tube body 16, so,, can make the joint location of sealing 18 and tube body 16 become simple by in this tubulose teat 14a, inserting tube body 16 both ends.

Yet, in the present invention, constitute the sealing 18 of enclosing sparking electrode 20 and lead terminal 22 with soft glass, the character that this soft glass had is, compare with described quartz glass, its fusing point low (the quartz glass fusing point is about more than 2000 degree, and the soft glass fusing point is about 600 degree), thermal expansivity big (thermal expansivity of soft glass is more than 10 times of thermal expansivity of quartz glass).

Therefore, when in sealing 18, enclosing sparking electrode 20 and lead terminal 22, can not crack because of the difference of soft glass thermal expansivity with the thermal expansivity of the metal that constitutes sparking electrode 20 and lead terminal 22.Thereby, in existing discharge tube 60 (Figure 27), enclose molybdenum foil 70 in the sealing 64 in order to prevent because of the thermal expansivity of the quartz glass that constitutes sealing 64 and to constitute crackle that the difference of thermal expansion coefficients of the metal of sparking electrode 68 produces, but under the situation of discharge tube 10 of the present invention, do not need, like this compared with existing discharge tube 60 owing to can shorten the length of sealing 64, so can realize the miniaturization of discharge tube.

And, the soft glass that constitutes sealing 18 of the present invention is because aforesaid low melting point, so needn't be as the existing discharge tube 60 that constitutes sealing 64 with the high-melting-point quartz glass, constituent material as sparking electrode 68 and lead terminal 72, must use the refractory metal as tungsten and molybdenum, can use for example Fe-Ni-Cr-alloy and dumet silk etc., the selection degree of freedom height of the constituent material of sparking electrode 20 and lead terminal 22.

In above-mentioned, although the situation to direct joint sealing 18 and tube body 16 is described, but constitute the soft glass of sealing 18 and constitute the quartz glass of tube body 16 because difference of thermal expansion coefficients is big, so the connectivity of sealing 18 and tube body 16 is poor, according to process conditions, owing to when engaging, on sealing 18 and tube body 16, crack, so as shown in figure 12, preferably engage sealing 18 and tube body 16 by sealed knot material 34.

The fusing point of described sealed knot material 34 is lower than the fusing point of the quartz glass of soft glass that constitutes sealing 18 and formation tube body 16, and apparatus has the made such as glass of thermal expansivity of cardinal principle intermediate value of the thermal expansivity of described soft glass and quartz glass.

Then, be after the both ends coating coating slurry shape sealed knot material 34 of described tube body 16, with the state in the tubulose teat 14a that tube body 16 both ends is inserted sealing 18, after with described sealed knot material 34 heat fused, by cooling curing, sealing 18 and tube body 16 are engaged with sealed knot material 34.

As mentioned above, because sealed knot material 34 usefulness have the roughly material formation of the thermal expansivity of intermediate value of soft glass thermal expansivity and quartz glass thermal expansivity, so the difference of the thermal expansivity of soft glass and the thermal expansivity of quartz glass is absorbed by described sealed knot material 34, its result has improved the connectivity of sealing 18 and tube body 16.

And as shown in figure 13, sealing 18 and tube body 16 also can engage by a plurality of sealed knot materials of in-between lamination structure.Promptly, in Figure 13, between sealing 18 and tube body 16, insert the first sealed knot material 34a that joins with tube body 16, lamination at the second sealed knot material 34b on this first sealed knot material 34a, lamination on this second sealed knot material 34b, the 3rd sealed knot material 34c that joins with sealing 18.

Any of described first to the 3rd sealed knot material 34a～34c, all use than the soft glass that constitutes sealing 18 and to constitute the quartz glass fusing point of tube body 16 low, and the glass material with the thermal expansivity that is worth between the thermal expansivity of described soft glass thermal expansivity and quartz glass constitute.And, the thermal expansivity of first to the 3rd sealed knot material 34a～34c from the first sealed knot material 34a to the second sealed knot material 34b, the 3rd sealed knot material 34c strengthens successively.Promptly, in first to the 3rd sealed knot material 34a～34c, the first sealed knot material 34a has minimum thermal expansivity, and, the 3rd closure material 34c has maximum thermal expansivity, also have, the thermal expansivity that the second sealed knot material 34b has the thermal expansivity of the described first sealed knot material 34a and the 3rd a sealed knot material 34c is the thermal expansivity of intermediate value substantially.

Like this, between tube body 16 that the quartz glass little with thermal expansivity constitutes and big soft glass constitutes with thermal expansivity sealing 18, first to the 3rd sealed knot material 34a～34c that 18 side thermal expansivity strengthen successively from tube body 16 sides to sealing is by lamination, so, as shown in figure 12, with when sealing 18 and 16 of tube bodies only insert single sealed knot material 34, compare, because the difference of the thermal expansivity of soft glass and the thermal expansivity of quartz glass is more flexibly absorbed by a plurality of sealed knot material 34a～34c, the engagement characteristics of sealing 18 and tube body 14 further improves.

In addition, as mentioned above, penetrate glass, be described although exemplify quartz glass as the ultraviolet ray that constitutes tube body 16,, the present invention is applicable to all glass with ultraviolet through characteristic, if can make hard glass that ultraviolet ray penetrates etc.

In described discharge tube, the sealing that is used for enclosing sparking electrode is made of soft glass, this soft glass is because to penetrate the thermal expansivity of glass than ultraviolet ray big, so can not crack because of the difference of the thermal expansivity of the thermal expansivity of soft glass and sparking electrode when enclosing sparking electrode in the sealing.So, in existing discharge tube, because of cracking, the difference of thermal expansivity that the ultraviolet ray that constitutes sealing penetrates glass and constitutes the metal of sparking electrode in sealing, encloses molybdenum foil for preventing, but in discharge tube of the present invention, do not need, can make of the shortening of sealing length like this, so can realize the miniaturization of discharge tube than existing discharge tube.

The discharge tube of showing fifth embodiment of the invention below.

Figure 14 is the cut-open view of the discharge tube 10 made by manufacture method of the present invention, and this discharge tube 10 is provided with: luminotron 12 penetrates glass tube by an elongated quartz glass tube or ultraviolet ray with horminess glass tube etc. of ultraviolet through characteristic and forms; A pair of sealed tube 14, with the both ends of this luminotron become with described luminotron 12 roughly the quadrature shape be connected, form by soft glass.

Described sealed tube 14 has straight tube-like tube body 16, a pair of sealing 18,19 with this tube body 16 both ends opens formation of melt-sealed, in described a pair of sealing 18,19, in the sealing 18 of one, enclose the part of sparking electrode 20 and lead terminal 22.Then, the leading section of described sparking electrode 20 is outstanding outside sealing 18, exposes in tube body 16, and simultaneously, an end of the lead terminal 22 that base end part is interior with imbedding sealing is connected.And the other end of described lead terminal 22 is outstanding outside sealing 18.

In the tube body of described sealed tube 14, form the roughly the same hole 26 of external diameter with described luminotron 21, from this hole 26 in the end tubular stinger body 16 of described luminotron 12, so that sealing 14 and luminotron 12 keep the state of connection, engage the outside, end and the sealed tube 14 of luminotron 12 again by sealed knot material 26, with this, constitute airtight container 28.

In described airtight container 28, generate as ultraviolet ray and use discharge gas, fill the ultra violet radiation gas of for example forming by argon and mercury mixing, or based on the ultra violet radiation gas of xenon.And, not shown, be covered with fluorophor in the outside of described luminotron 12.

Then, if on discharge tube 10, apply voltage, so, discharge electron impact ultra violet radiation gas, the ultraviolet ray of radiating various wavelength 20 of sparking electrodes by pair of lead wires 22.The ultraviolet ray of radiation sees through with ultraviolet ray and penetrates the luminotron 12 that glass constitutes, and the fluorophor in luminotron 12 outsides is covered in excitation, produces visible light.

Below, the manufacture method of described discharge tube 10 is described according to Figure 15 to Figure 19.At first, connect sparking electrode 20 and lead terminal 22 in advance, the sparking electrode 20 of this connection and lead terminal 22 are inserted in the soft glass pipes 40 by the soft glass pipe 40 1 distolateral openings that become sealed tube 14 bases.At this moment, the other end of described lead terminal 22 is configured to outside described soft glass pipe 40 outstanding.

Under this state, after the side of the insertion sparking electrode 20 of the described soft glass pipe 40 of heat fused and lead terminal 22, form described sealing 18 by cooling curing.

Then, the roughly the same hole 26 of external diameter of formation and luminotron 12 on the tube body 16 of soft glass pipe 40.

This hole 26 can be under the soft state by being blown into gases formation such as nitrogen or air at it by the tube body 16 of heating soft glass pipe 40.

In addition, also can make the soft glass evaporation that constitutes tube body 16, form described hole 26 by irradiating laser line on the tube body 16 of soft glass pipe 40.

In this case, shine on the tube body 16 at the 26 formation place rears, hole that are positioned at tube body 16, must will block the blocking in the parts tubular stinger body 16 of laser rays in order to prevent laser rays.

Also have, make the water continuous stream that contains small sand grains cross described tube body 16 surfaces, simultaneously,, cut tube body 16 by sand grains contained in the water and also can form described hole 26 flowing through the ultrasonic vibration that applies waterborne of hole 26 formation place.

And, use the tube body 16 of microburner fusing soft glass pipe 40 also can form described hole 26.

Have, when the method at the linear pore-forming 26 of irradiating laser, the water that contains small sand grains is done under the situation of method that ultrasonic vibration forms hole 26, the shape in hole 26 and size are controlled than being easier to.

Then, after outside, luminotron 12 ends coating coating slurry shape sealed knot material 26, as shown in figure 17, the end of luminotron 12 is inserted in soft glass pipe 40 tube bodies 16, luminotron 12 and soft glass pipe 40 are communicated with from described hole 26.

Described sealed knot material 34 usefulness are lower with the fusing point that the ultraviolet ray that constitutes luminotron 12 penetrates glass than the soft glass that constitutes soft glass pipe 40, and the materials such as glass with thermal expansivity of the thermal expansivity of described soft glass and the thermal expansivity cardinal principle intermediate value that ultraviolet ray penetrates glass constitute.

Then, as shown in figure 16, with fusing point height, and, make sealed knot material 34 be heated fusing than the low-melting temperature of described soft glass and ultraviolet ray transmitting glass than described sealed knot material 34 by burner 32.If at normal temperatures make sealed knot material 34 cooling curings, so, can by sealed knot material 34 engage soft glass pipe 40 and luminotron 12 thereafter.

In addition, although for convenience of description, emphasized to show the thickness of sealed knot material 34, in fact sealed knot material 34 applies as thin as a wafer.

After on luminotron 12 both ends, engaging soft glass pipe 40 respectively, by not shown exhaust apparatus, the gas in another of soft glass pipe 40 distolateral drain soft glass pipe 40 and luminotron 12, form vacuum state after, fill ultra violet radiation gas.Thereafter, as shown in figure 17, another of usefulness burner 32 heat fused soft glass pipes 40 is distolateral, seals, and forms described sealing 19.

At last, cover fluorophor, then finish discharge tube 10 as shown in figure 14 in the outside of luminotron 12.

As mentioned above, in the present invention, with fusing point height than corresponding sealed knot material 34, and, the soft glass of the described sealed tube 14 of ratio formation and the ultraviolet ray of formation luminotron 12 penetrate the low-melting temperature heat fused of glass and use the ultraviolet ray that constitutes than soft glass that constitutes sealed tube 14 and formation luminotron 12 to penetrate after the sealed knot material 34 of the low-melting material formation of glass, pass through cooling curing, through this sealed knot material 34, make the joint of sealed tube 14 and luminotron 12, so when both engaged, sealed tube 14 can not melt.

And, sealed knot material 34 is owing to the expansion coefficient material formation of the roughly intermediate value of the thermal expansivity that penetrates glass with thermal expansivity with the soft glass that constitutes sealed tube 14 and the ultraviolet ray that constitutes luminotron 12, so the coefficient of thermal expansion differences of soft glass thermal expansivity and quartz glass is absorbed by described sealed knot material 34, its result, the connectivity of sealed tube 14 and luminotron 12 improves, when both engage, can prevent that the crackle that its coefficient of thermal expansion differences causes from taking place.

Figure 18 and Figure 19 represent the figure of other discharge tube making methods of the present invention.In this manufacture method, different with luminotron 12 this point, identical with above-mentioned manufacture method in fact in addition with said method by a plurality of sealed knot materials joint sealed tubes 14 of lamination structure.

Promptly, under this manufacture method situation, as shown in figure 18, outside, the end of the luminotron 12 coating coating slurry shape first sealed knot material 34a, the pulp-like second sealed knot material 34b of lamination on this first sealed knot material 34a, on this second sealed knot material 34b pulp-like the 3rd sealed knot material 34c of lamination.

Any of described first to the 3rd sealed knot material 34a～34c all used lower with the fusing point that the ultraviolet ray that constitutes luminotron 12 penetrates glass than the soft glass that constitutes soft glass pipe 40, and, have the thermal expansivity of described soft glass and materials such as glass that ultraviolet ray penetrates the thermal expansivity between the thermal expansivity of glass and constitute.

And second sealed knot material 34b, the three sealed knot material 34c of the thermal expansivity of first to the 3rd sealed knot material 34a～34c from the first sealed knot material 34a of luminotron 12 sides to the outside strengthens successively.Promptly, in first to the 3rd sealed knot material 34a～34c, the first sealed knot material 34a has minimum coefficient of thermal expansion, and the 3rd sealed knot material 34c has maximum thermal expansivity, also have, the second sealed knot material 34b have the thermal expansivity of the described first sealed knot material 34a and the 3rd sealed knot material 34c thermal expansivity roughly in the middle of thermal expansivity.

Then as shown in figure 19, by burner 32 to be higher than the fusing point of described first to the 3rd sealed knot material 34a～34c, and, be lower than the temperature that soft glass that constitutes described sealed tube 14 and the ultraviolet ray that constitutes luminotron 12 penetrate the fusing point of glass, heat fused first to the 3rd sealed knot material 34a～34c.

Thereafter, if cooling curing first to the 3rd sealed knot material 34a～34c at normal temperatures, so, the first sealed knot material 34a by joining with luminotron 12, the second sealed knot material 34b of lamination on this first sealed knot material 34a, on this second sealed knot material 34b lamination, the 3rd sealed knot material 34c with sealed tube 14 joins engages sealed tube 14 and luminotron 12.

Like this, penetrate between the sealed tube 14 that luminotron 12 that glass constitutes and the big soft glass of thermal expansivity constitute in the ultraviolet ray little with thermal expansivity, because lamination first to the 3rd sealed knot material 34a～34c that 14 side thermal expansivity strengthen successively from luminotron 12 sides to sealed tube, so compared with the situation that between sealed tube 14 and luminotron 12, only sandwiches single sealed knot material 26, can more gently absorb the thermal expansivity of soft glass and the coefficient of thermal expansion differences that ultraviolet ray penetrates glass by a plurality of sealed knot material 34a～34c, the connectivity of sealed tube 14 and luminotron 12 is further improved.

In described discharge tube, using than this sealed knot material melting point height, and penetrate the low-melting temperature of glass than the ultraviolet ray of soft glass that constitutes described sealed tube and formation luminotron, heat fused is used than the soft glass that constitutes sealing and the ultraviolet ray that constitutes luminotron and is penetrated after the sealed knot material that the low-melting material of glass constitutes, pass through cooling curing, do being connected of sealed tube and luminotron through this sealed knot material, so when both engage, can prevent the sealed tube fusing.

And, since with have thermal expansivity that soft glass thermal expansivity that constitutes sealed tube and the ultraviolet ray that constitutes luminotron penetrate glass roughly the material of the thermal expansivity of intermediate value constitute the sealed knot material, so, the thermal expansivity of soft glass and ultraviolet ray penetrate the coefficient of thermal expansion differences of glass by described sealed knot absorbed, its result, the connectivity of sealed tube and luminotron improves, and when both engage, prevents to cause crackle because of its coefficient of thermal expansion differences.

Have again, cover a plurality of layers of sealed knot material that are into lamination structure at the sealed knot material of outside, luminotron both ends, so described many sealed knot materials from the sealed knot material of luminotron side to the outside the sealed knot material since its thermal expansivity strengthen successively, so constitute the poor of the thermal expansivity of soft glass of sealed tube and thermal expansivity that the ultraviolet ray that constitutes luminotron penetrates glass, can gently be absorbed better by many sealed knot materials, the connectivity of sealed tube and luminotron further improves.

Below, show the sixth embodiment of the present invention.Figure 20 is that this discharge tube 10 has with the cut-open view of the discharge tube 10 of manufacture method manufacturing of the present invention: luminotron 12, form by the horminess glass tube that has ultraviolet through characteristic; A pair of sealed tube 14, on the two ends of this luminotron 12 12a, 12b with described luminotron 12 roughly the state of being orthogonal be connected, by forming with the hard glass with ultraviolet through characteristic of described luminotron 12 same materials.

Described sealed tube 14 has a pair of sealing 18,19 of straight tube-like tube body 16 and this tube body 16 both ends opens formation of melt-sealed, in described a pair of sealed tube 18,19, on the sealing 18 of one, enclose the part of sparking electrode 20 and lead terminal 22.Then, described sparking electrode 20 leading sections are outstanding outside sealing 18, expose in tube body 16, and simultaneously, an end of the lead terminal 22 that base end part is interior with imbedding sealing 18 is connected.And the other end of described lead terminal 22 is outstanding outside sealing 18.

And, in the both ends of described luminotron 12 12a, 12b, insert configuration cylindrical body 24,24 respectively.This cylindrical body 24 is by higher than the hard glass that constitutes luminotron 12 (fusing point be about 800 degree) fusing point and have material quartz glass formations such as (about 2000 degree of fusing point) of light transmission.Like this and since use material as quartz glass with light transmission constitute as described in cylindrical body 24, cylindrical body 24 can not cover the ultraviolet from luminotron 12, can not cause the light-emitting area of luminotron 12 to reduce.

Certainly, as the material that constitutes described cylindrical body 24, also can use than opaqueness materials such as high pottery of the hard glass fusing point that constitutes above-mentioned luminotron 12 and aluminium.In this case, for the minimizing of the light-emitting area that reduces luminotron 12 as far as possible, be preferably in the length that shortens cylindrical body 24 in the possible limit.

Also have, described cylindrical body 24 its parts also can be inserted into configuration from the outstanding some states of end 12a, the 12b of described luminotron 12.

The hole 26 of the external diameter same size of formation and luminotron 12 on the tube body 16 of described sealed tube 14.In the end 12a of luminotron 12, the 12b tubular stinger body 16,, constitute airtight container 28 like this from this hole 26 so that the state that sealed tube 14 and luminotron 12 are communicated with engages end 12a, the 12b outside and the sealed tube 14 of luminotron 12.

In described airtight container 28, take place use discharge gas as ultraviolet ray, fill for example ultra violet radiation gas of mixed argon and mercury composition, or based on the ultra violet radiation gas of xenon.And diagram is omitted, at described luminotron 12 outsides coating fluorophor.

Then, if apply voltage by pair of lead wires terminal 22 on discharge tube 10, discharge 20 of sparking electrodes so, electronics bumps against on the ultra violet radiation gas, radiates the ultraviolet ray of various wavelength.The ultraviolet ray of radiation penetrates with ultraviolet ray and penetrates the luminotron 12 that glass constitutes, and the fluorophor in luminotron 12 outsides is covered in excitation, produces visible light.

Below, the manufacture method of described discharge tube 10 is described according to Figure 21 to Figure 23.At first, connect sparking electrode 20 and lead terminal 22 in advance, the sparking electrode 20 of this connection and lead terminal 22 are inserted the horminess glass tubes 41 from the horminess glass tube 41 1 distolateral openings that become sealed tube 14 bases.At this moment, the other end of described lead terminal 22 is configured to give prominence to described horminess glass tube 41.

Under this state, after the end of the insertion sparking electrode 20 of the described horminess glass tube 41 of heat fused and lead terminal 22 sides,, form described sealing 18 by cooling curing.

Then, on the tube body 16 of horminess glass tube 41, form hole 26 with the identical size of luminotron 12 external diameters cardinal principle.

The formation in this hole 26 can be by the tube body 16 of heating hard glass 41, is blown into gases such as nitrogen or air under its soft state and realizes making.

Perhaps, irradiating laser line on the tube body 16 of horminess glass tube 41 makes the hard glass evaporation that constitutes tube body 16, also can form described hole 26.

In this case, shine on the tube body 16 at rear of hole 26 formation place that are positioned at tube body 16 in order to prevent laser rays, must be blocking the blocking in the parts tubular stinger body 16 of laser rays.

In addition, the water that contains small sand grains is flowed continuously on the surface of described tube body 16, the water that 26 formation place along the hole are flowed applies ultrasonic vibration simultaneously, cuts tube body 16 by sand grains contained in the water and also can form described hole 26.

And, using micro-burner, the tube body 16 of fusing horminess glass tube 41 also can form described hole 26.

Also have, using laser rays to form the method in hole 26, the water that contains small sand grains is done under the situation of method that ultrasonic glass vibration forms hole 26, the size and the shape in hole 26 are controlled easily.

Secondly, in the end of described luminotron 12 12a, 12b, insert after the described cylindrical body 24, as shown in figure 21, in the tube body 16 of end 12a with luminotron 12, luminotron 12 and horminess glass tube 41 are communicated with by described hole 26 insertion horminess glass tubes 41.

Then, as shown in figure 22, near the hole 26 of usefulness burner 32 with luminotron 12 end 12a and horminess glass tube 41, with fusing point height than the hard glass that constitutes described luminotron 12 and horminess glass tube 41, and low-melting temperature heating than described cylindrical body 24, after luminotron 12 and horminess glass tube 30 both sides fusing, make it cooling curing, solder joints luminotron 12 and horminess glass tube 41.As mentioned above, luminotron 12 is with sealed tube 14 because with identical hard glass formation, so both thermal expansivity are equal, so connectivity is fabulous.

After engaging horminess glass tube 41 respectively on luminotron 12 both ends 12a, the 12b, by the gas of not shown exhaust apparatus in another the distolateral discharging horminess glass tube 41 of horminess glass tube 41 and the luminotron 12, become after the vacuum state, fill ultra violet radiation gas.Thereafter, distolateral and seal with another of burner 32 heat fused horminess glass tubes 41 as shown in figure 23, form described sealing 19.

At last, cover fluorophor, finish discharge tube 10 as shown in figure 20 so in the outside of luminotron 12.

As mentioned above, in the present invention, in the end of luminotron 12 12a, 12b, insert the cylindrical body 24 that configuration uses the material higher than the hard glass fusing point that constitutes luminotron 12 to constitute, simultaneously, with fusing point height than the hard glass that constitutes luminotron 12 and sealed tube 14 (horminess glass tube 41), and than described cylindrical body 24 low-melting temperature heating, do the welding of luminotron 12 end 12a, 12b and sealed tube 14, so when welding, even if end 12a, the 12b of luminotron 12 fusing, cylindrical body 24 can not melt yet.Therefore, can prevent inner obstruction of end 12a, 12b of causing because of fusing or the luminotron 12 of thermal deformation.And, because in the end 12a of luminotron 12, the 12b tubular stinger body 16, so, can prevent from also that sealed tube 14 because of fusing or thermal deformation from entering in end 12a, the 12b of luminotron 12 to cause the inner obstruction of end 12a, 12b.

In above-mentioned, although the situation of using the sealed tube 14 that constitutes with the hard glass of luminotron 12 identical materials is illustrated,, the present invention also is applicable to the situation of using the sealed tube 14 that constitutes with luminotron 12 unlike materials.

For example, also available than low, the handling ease of described hard glass fusing point, cheap again simultaneously soft glass (fusing point is about 600 degree) constitutes sealed tube 14.In this case, with than after the high temperature heat fused sealed tube 14 of the soft glass fusing point that constitutes sealed tube 14, by cooling curing sealed tube 14 is welded on luminotron 12 end 12a, the 12b, to carry out end 12a, the 12b of luminotron 12 and engaging of sealed tube 14.In this case, thermal deformation owing in order to make the sealed tube fusing need to carry out with the temperature more much higher than soft glass fusing point rapidly, also often take place so constitute the hard glass of luminotron 12 in above-mentioned heating.But, as mentioned above, in the end of luminotron 12 12a, 12b, use than the hard glass that constitutes luminotron 12 cylindrical body 24 that constitutes of materials with high melting point more owing to insert to have disposed, so can not take place to stop up in end 12a, the 12b that the luminotron 12 because of thermal deformation causes.And end 12a, the 12b of luminotron 12 is owing in the tubular stinger body 16, enter the end 12a of luminotron 12, the obstruction in end 12a, the 12b that 12b causes so also can prevent the sealed tube 14 because of fusing.

In addition, although in above-mentioned, as the glass that constitutes luminotron 12, exemplified hard glass and described, but be not limited thereto, so long as have the glass of ultraviolet through characteristic with ultraviolet through characteristic, for example quartz glass etc. promptly can be used as the material that constitutes described luminotron 12 and uses.

Figure 24 be expression described luminotron 10 the major part schematic cross sectional views during as the use of the light source of the back of the body illuminator of penetrating type display board.As shown in figure 24, the luminotron 12 of discharge tube 10 is along the end face configuration of light guide plate 35.And, the one sealing 19 of each sealed tube 14 and from the hole tube body 16 of inclined to one side sealing 19 sides of 26 formation place, along with the configuration of the end face of the light guide plate 35 1 end face quadratures that disposed described luminotron 12, another sealing 18 and from the hole tube body 16 of inclined to one side sealing 18 sides of 26 formation place from the outstanding configuration in the end of light guide plate 35.Then, at one of the outstanding luminotron 12 that disposes from light guide plate 35 ends distolateral above-mentioned sealing 18 and tube body 16, and configuration has the drive division 36 of the driving circuit etc. of discharge tube 10 in above-mentioned sealing 18 that other are distolateral and the space between the tube body 16, can seek to carry on the back the miniaturization of illuminator profile.

If on discharge tube 10, apply voltage by pair of lead wires terminal 22 then, so, between sparking electrode 20, discharge electron impact ultra violet radiation gas, the ultraviolet ray of radiating various wavelength.The ultraviolet ray of radiation sees through luminotron 12, and the fluorophor in luminotron 12 outsides is covered in excitation, produces visible light.This visible light forms towards the light that is configured in the not shown penetrating type display board side in light guide plate 35 tops by above-mentioned light guide plate 35 scattered reflections.

In described discharge tube, in the luminotron both ends, insert configuration by penetrate the cylindrical body that the high material of glass fusing point is formed than the ultraviolet ray that constitutes luminotron, simultaneously, with than luminotron and the sealed tube fusing point height of the constituent material of one at least, and than the low-melting temperature heating of described cylindrical body, solidify again after making the one at least fusing of luminotron and sealed tube, carry out the welding of tube ends and sealed tube, so when welding, even tube ends fusing or thermal deformation, cylindrical body can not melt yet.Therefore, the obstruction in the end that can prevent to cause because of luminotron fusing or thermal deformation.And the luminotron both ends are because respectively in the tubular stinger body, so even sealed tube fusing or thermal deformation when welding also can prevent to melt or the sealed tube of thermal deformation enters and makes in the end and stop up from tube ends.

And, penetrate glass with ultraviolet ray and constitute sealed tube with the identical material of luminotron, with penetrating glass fusing point height than the ultraviolet ray that constitutes luminotron and sealed tube, and, than the low-melting temperature of described cylindrical body heat described luminotron both ends and sealed tube near, solidify again after making the fusing of luminotron and sealed tube, carry out the welding of tube ends and sealed tube, when welding, even if tube ends fusing or thermal deformation can not make the cylindrical body fusing yet.Therefore, can prevent to melt or end that the luminotron of thermal deformation causes in stop up.And the luminotron both ends are because in the difference tubular stinger body, so when welding, can prevent to enter the obstruction that causes in the end from tube ends because of the sealed tube of fusing or thermal deformation.

Have again, owing to constitute to insert the cylindrical body that is configured in the tube ends with translucent material, thus can not cause described cylindrical body to shelter from luminescence-utraviolet from luminotron, so can prevent the minimizing of luminotron light-emitting area.

Claims (13)

1. a discharge tube is characterized in that, have the luminotron formed by translucent material and with the direction configuration that is orthogonal substantially of the both ends open of this luminotron, enclose the sealed tube of the sparking electrode that connected state is connected to form simultaneously; Described sealed tube has first sealing, second sealing of tube body and this tube body both ends open formation of sealing, and the outside of second sealing forms the general plane shape, and simultaneously, described luminotron is connected near the tube body of the position of described second sealing.

2. according to the discharge tube of claim 1, it is characterized in that it is thin that described luminotron external diameter is done than sealed tube.

3. according to the discharge tube of claim 1, it is characterized in that described luminotron is enclosed mercury vapor in inside, on the pipe face, form luminescent coating.

4. according to the discharge tube of claim 1, it is characterized in that described sealing is made up of the material bigger than the thermal expansivity of this luminotron.

5. according to the discharge tube of claim 4, it is characterized in that described sealing is made up of the sealed knot material lower than the material melting point that constitutes described luminotron.

6. according to the discharge tube of claim 5, it is characterized in that described sealing is formed by the sealed knot material joint of a plurality of laminations, and the sealed knot material of described a plurality of laminations is outside from described luminotron, its expansion coefficient strengthens formation successively.

7. a back of the body illuminator is provided with light guide plate and discharge tube; It is characterized in that, described discharge tube constitutes, on the luminotron both ends that form by translucent material, make, have first sealing that tube body and the both ends open that seals this tube body form by translucent material, the sealed tube of second sealing is connected with quadrature respectively substantially, form airtight container, in this airtight container, enclose discharge gas, and in first sealing of described each sealed tube, enclose the part of sparking electrode; The outside of second sealing of described each sealed tube of discharge tube of butt joint configuration respectively on the both ends of an end face of described light guide plate, simultaneously, an end face of the light guide plate beyond the both ends of the outside butt joint configuration of described second sealing disposes described luminotron.

8. a back of the body illuminator is provided with light guide plate and discharge tube; It is characterized in that, described discharge tube constitutes, on the luminotron both ends that form by translucent material, make, have first sealing that tube body and the both ends open that seals this tube body form by translucent material, the sealed tube of second sealing is connected with quadrature respectively substantially, form airtight container, in this airtight container, enclose discharge gas, and in first sealing of described each sealed tube, enclose the part of sparking electrode; On the both ends of an end face of described light guide plate, form otch, along the luminotron of the described discharge tube of configuration on the end face that does not form this otch, simultaneously, configuration tube body and second sealing outstanding in described otch from described luminotron outer end.

9. the manufacture method of a discharge tube, it is characterized in that, be connected to form a pair of sealed tube of the inclosure sparking electrode that is arranged in the H font substantially at the two ends of luminotron connected state, simultaneously, clamp the one sealed tube at least and connecting portion luminotron, on the part relative, set getter material in advance, then with sparking electrode, make after described sealed tube and luminotron inside vacuumizes, the sealed tube of removing the described getter material of configuration is good seal again.

10. the manufacture method of discharge tube according to claim 9, it is characterized in that, carry out being connected of sealed tube and luminotron with the sealed knot material, should be by the connection of sealed knot material, at first be covered with fusing point than the low sealed knot material of material that constitutes described sealed tube and luminotron in outside, luminotron both ends, then, by the hole that is formed on the described sealed tube body both ends of described luminotron are inserted in this tube body, thereafter, use than this sealed knot material melting point high and make described sealed knot material melts than described sealed tube and the low-melting temperature of luminotron after, make its curing again.

11. the discharge tube making method according to claim 10 is characterized in that, apparatus have described sealed tube thermal expansivity and luminotron thermal expansivity roughly the material of the thermal expansivity of intermediate value constitute described sealed knot material.

12. discharge tube making method according to claim 11, it is characterized in that, the sealed knot material that is covered with in outside, described luminotron both ends is a plurality of sealed knot materials that form lamination structure, the fusing point of described a plurality of sealed knot materials is lower than described sealed tube and luminotron, and, have the thermal expansivity between both thermal expansivity, and, the sealed knot material of described a plurality of sealed knot material from the sealed knot material of luminotron side to the outside, its thermal expansivity increases successively.

13., in luminotron and sealed tube, enclose the discharge gas that produces ultraviolet usefulness according to the manufacture method of any one described discharge tube among the claim 9-12.

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