CN100538992C - Discharge tube and the planar light source device that uses discharge tube - Google Patents
Discharge tube and the planar light source device that uses discharge tube Download PDFInfo
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- CN100538992C CN100538992C CNB2005800016899A CN200580001689A CN100538992C CN 100538992 C CN100538992 C CN 100538992C CN B2005800016899 A CNB2005800016899 A CN B2005800016899A CN 200580001689 A CN200580001689 A CN 200580001689A CN 100538992 C CN100538992 C CN 100538992C
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- discharge tube
- fluorescent tube
- pars intermedia
- tube
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/007—Incandescent lamp or gas discharge lamp
- G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/305—Flat vessels or containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/33—Special shape of cross-section, e.g. for producing cool spot
Abstract
The luminosity that the objective of the invention is to increase the current density of tube current and improve discharge tube.Solution of the present invention is a kind of discharge tube, and fluorescent tube (2) is set in this discharge tube (1), and this fluorescent tube (2) comprising: the both ends (2a) that dispose electrode (4) and have circular annular cross-section; Form between both ends (2a) with non-circular annular cross-section, and the area of section radially is less than the pars intermedia (2b) of both ends (2a); The connecting portion (2c) that connects both ends (2a) and pars intermedia (2b).Because the area of section of the pars intermedia (2b) of non-circular annular cross-section is less than the both ends (2a) of circular annular cross-section, therefore the current density ratio fluorescent tube in the past that flows through the tube current of pars intermedia (2b) between electrode (4) increases to some extent, thereby can improve the luminosity of discharge tube (1).In addition, owing to can in the both ends of circular annular cross-section (2a), be configured to the electrode (4) of past circular section, therefore can use the electrode (4) of low price, general circular section.
Description
Technical field
The present invention relates to the discharge tube that the densification by tube current improves luminosity, and the planar light source device such as backlight that has utilized the characteristic of this discharge tube.
Technical background
The discharge tube that the section shape that fluorescent tube is all forms the fluorescent discharge pipe of non-circular ring-types such as ellipse or fluorescent lamp etc. is well-known.For example, be equipped with at the disclosed fluorescent discharge light fixture of patent documentation 1 (open in fact clear 58-134856 communique (the 1st page, the 2nd figure)): be packaged with the discharge that comprises small amounts of mercury with gas and have the fluorescent tube that ellipse, oval and semicircle etc. are roughly the section of flat shape; Coat the phosphor body of tube inner wall; And the electrode that is directed in lamp tube ends.
In addition, (spy opens (the 3rd page in clear 56-99961 communique at patent documentation 2, the 8th figure and the 9th figure)) disclosed fluorescent lamp, except the fluorescent tube end, form thin tube part, described thin tube part is roughly oval section shape having alternately on the side face up and down of the central axis direction of the fluorescent tube of connection electrode.In this discharge tube, because reduce the pipe basal area of the thin tube part that is roughly the elliptical annular section, increase the thermionic density of emitting, thereby the electric potential gradient of illuminating part is increased from electrode, therefore can improve the luminosity of discharge tube.
In addition, possess parallel and leave the reflector that discharge tube disposes, and the planar light source device such as backlight of light guide plate with end face of and configuration relative with discharge tube is known with discharge tube.For example, the back lighting device of the liquid crystal indicator that patent documentation 3 (spy opens flat 4-198917 communique (the 5th page, the 4th figure)) is disclosed possesses the diameter discharge tube littler than the diameter at the both ends that dispose electrode of pars intermedia.
Summary of the invention
According to the present invention, a kind of discharge tube is provided, possess the fluorescent tube that forms enclosure space and be fixed in the two ends of this fluorescent tube and be disposed at pair of electrodes in the above-mentioned enclosure space, voltage put between the above-mentioned pair of electrodes make it luminous, described discharge tube is characterised in that: above-mentioned fluorescent tube comprises: both ends, dispose above-mentioned electrode and have circular annular cross-section; Pars intermedia, with non-circular annular cross-section be formed between the above-mentioned both ends and the area of section radially less than above-mentioned both ends; Connecting portion connects above-mentioned both ends and above-mentioned pars intermedia, and wherein above-mentioned electrode has cupule or the cylindrical portion of short diameter of diameter greater than the pars intermedia of above-mentioned fluorescent tube.
According to the present invention, a kind of planar light source device is provided, possess: technical scheme 1 each discharge tube of putting down in writing to the technical scheme 4; The reflector that disposes from above-mentioned discharge tube devices spaced apart; Have the light guide plate with the end face of above-mentioned discharge tube subtend configuration, described planar light source device is characterised in that: make the end of longest diameter of the fluorescent tube of above-mentioned discharge tube, with the end face subtend configuration of above-mentioned light guide plate.
According to the present invention, a kind of planar light source device is provided, possess: technical scheme 1 each a plurality of discharge tubes of putting down in writing to the technical scheme 4; The reflector that disposes from above-mentioned discharge tube devices spaced apart; Have the light guide plate of the end face that disposes with above-mentioned each discharge tube subtend, described planar light source device is characterised in that: make the longest diameter of the fluorescent tube of above-mentioned discharge tube, for the plane parallel crustal inclination vertical with the end face of above-mentioned light guide plate.
According to the present invention, a kind of planar light source device is provided, possess: technical scheme 1 each a plurality of discharge tubes of putting down in writing to the technical scheme 4; The reflector that disposes from this each discharge tube devices spaced apart; Have the light guide plate with the end face of above-mentioned each discharge tube subtend configuration, described planar light source device is characterised in that: the pars intermedia of the fluorescent tube of above-mentioned each discharge tube when the face to the end face that comprises light guide plate carries out the forward projection, forms and repeats the Projection Division.
In the fluorescent discharge lamp that above-mentioned patent documentation 1 is disclosed, must make the section shape of electrode form slightly flat shapes such as the ellipse similar, microscler circle and semicircle to the section shape of fluorescent tube.Therefore become special electrode shape, have can't use at a low price the problem of electrode of general circular section in the past.That is,, when electrode large-scale (large tracts of land) is changed, can't guarantee the distance of electrode till the internal face of fluorescent tube, and make the lost of life of fluorescent tube if use the electrode of general circular section in the past.In addition, in above-mentioned patent documentation 2 disclosed fluorescent lamps, because at the mutual thin tube part that forms on the side face up and down of the central axis direction of the fluorescent tube that links electrode with the section shape that slightly is oval, therefore shape becomes complicated and is difficult to make, in addition, because fluorescent tube is at warpage that many places produce, so electronics can't successfully flow through at illuminating part, thereby has the defective that is difficult to obtain the high luminosity of equalization with respect to tube axial direction.In addition, in the back lighting device of above-mentioned patent documentation 3 disclosed liquid crystal indicators because the both ends of fluorescent tube are different with the circumference of fluorescent tube beyond it, therefore have 2 kinds of girths fluorescent tube complex structure and be difficult to manufacturing.In addition, also have following problem, that is, under the shape condition of the illuminating part that makes fluorescent tube for more elongated circle, the light taking-up face around the illuminating part narrows down, and therefore, even improve current density, also can't realize high brightness in high level ground.Under the situation of the back lighting device that is used in straight-down negative etc., can't preferably the light that reflector reflected be sent to the outside especially, exist in the back lighting device of straight-down negative, not necessarily improve the problem of the brightness of display surface.
Therefore, thus the object of the present invention is to provide the density that can make tube current increase to improve the discharge tube of luminosity.In addition, other purposes of the present invention are to provide the electrode that can use circular section in the past, the discharge tube of making in low-cost and simple mode.In addition, other purposes of the present invention are to provide high brightness and long discharge tube of life-span.In addition, other purpose of the present invention is to provide the planar light source device that can realize slimming, high brightness.
Planar light source device of the present invention (20) possesses the reflector (21) that disposes from the discharge tube devices spaced apart; And have and the light guide plate (22) of the end face (22a) of discharge tube (1) subtend configuration, and possesses the limiting unit (23) that is used for limiting discharge tube (1) because of the difference of situation.In addition, in the planar light source device (20) of present embodiment, make the longest diameter of each pars intermedia (2b), for the plane parallel crustal inclination vertical with the end face (22a) of light guide plate (22), and, parallel each other at the central shaft that makes fluorescent tube (2), or when the face of the end face (22a) that comprises light guide plate (22) carried out the forward projection, form and repeat Projection Division (A), and a plurality of discharge tubes (1) are disposed in the reflector (21), but the luminosity of therefore thinning planar light source device, and raising planar light source device.
The effect of invention
In the present invention, because the area of section of the pars intermedia (2b) of fluorescent tube (2) is less than the area of section of in the past fluorescent tube, therefore the current density ratio discharge tube in the past of the tube current of the pars intermedia (2b) that flows through fluorescent tube (2) between pair of electrodes (4) is increased to some extent, thereby improve the luminosity of discharge tube.In addition, can in the both ends of circular annular cross-section (2a), be configured to the electrode (4) of past circular section.In this case, even being increased, electrode (4) seeks big electric currentization, because the interval between the inwall of electrode (4) and fluorescent tube (2) is bigger, therefore can prevent to cause the melanism of discharge tube (1), thereby obtain high brightness and long-life discharge tube (1) because of the deposition of the amalgam that sputter produced of electrode (4).In addition, if make the girth of the both ends (2a) of fluorescent tube (2) and pars intermedia (2b) identical, then the surface area of fluorescent tube (2) is identical with the fluorescent tube of in the past circular annular cross-section, therefore can obtain bigger light-emitting area, high level ground realization high brightnessization.In addition, can utilize fluorescent tube in the past, and adopt the simple and easy processing that middle body is processed as flat, can produce discharge tube with lower cost with circular annular cross-section.Moreover, if make the cup-shaped or the diameter of electrode cylindraceous (4) the shortest diameter greater than the pars intermedia (2b) of fluorescent tube (2), then can successfully emit from the inboard of electrode (4) to the pars intermedia (2b) of fluorescent tube (2) owing to electronics, therefore and the overwhelming majority of electronics flows through in the center side of electrode (4), can prevent that electronics from emitting from the side of electrode (4).Its result is, can prevent from effectively to cause the melanism of discharge tube (1) because of the deposition of the amalgam that sputter produced of electrode (4), thereby can seek the long lifetime of discharge tube (1) high-levelly.In addition, if make cup-shaped or the diameter of electrode cylindraceous (4) the shortest diameter, then, therefore seek high brightnessization because the electronics of being emitted from electrode 4 can good flowing through the pars intermedia (2b) of fluorescent tube (2) greater than the pars intermedia (2b) of fluorescent tube (2).In addition, if make connecting portion (2c) form taper, the distance between the leading section that then can fully guarantee electrode (4) and the pars intermedia (2b) of fluorescent tube (2), so help preventing of melanism.And then, have diameter (2a) dwindles and the reducing diameter part (2d) that enlarges and the connecting portion (2c) of wide diameter portion (2e) gradually to pars intermedia (2b) from both ends if be provided with, then the electronics of being emitted from electrode (4) is easier the flowing through of center side of fluorescent tube (2) and electrode (4).In addition, if set the length (L of the pars intermedia (2b) of fluorescent tube (2)
B) be longer than the summation (L of the length at both ends (2a)
A1+ L
A2), then light-emitting zone expansion can be sought high brightnessization.
In addition, make the end of longest diameter of the fluorescent tube (2) of discharge tube of the present invention, the relative configuration of end face (22a) with light guide plate (22), or make the longest diameter of the fluorescent tube (2) of a plurality of discharge tubes, tilt concurrently for the plane vertical with the end face (22a) of light guide plate (22), and each discharge tube is disposed in the interior planar light source device of the present invention of reflector parallel to each other, can realizes more in the past the planar light source device of the high brightness of more slimming.And then the pars intermedia (2b) of the fluorescent tube (2) of discharge tube (1) when the end face (22a) that comprises light guide plate (22) is carried out forward projection, repeats Projection Division (A) owing to form, and therefore can realize the planar light source device of the high brightness of slimming.In addition, the pars intermedia (2b) of the fluorescent tube (2) that supports discharge tube (1) and the limiting unit (23) that limits the angle of inclination (θ) of pars intermedia (2b) are installed on the pars intermedia (2b) of fluorescent tube (2), therefore fluorescent tube (2) can be fixed on the specified position, and be reduced the destruction to fluorescent tube (2) of being caused because of vibration.
Description of drawings
Fig. 1 is the oblique view of expression based on the execution mode of discharge tube of the present invention.
Flat when Fig. 2 is the installation of Fig. 1 to profile.
Lateral sectional view when Fig. 3 is the installation of Fig. 1.
Front elevation when Fig. 4 is the installation of Fig. 1.
Fig. 5 is the expansion profile of the part of Fig. 2.
Fig. 6 is the lateral sectional view that expression is disposed at fluorescent tube the state in the finishing die.
Fig. 7 is the flat to profile of Fig. 6.
Fig. 8 is the lateral sectional view that the state of mould is closed the finishing die of Fig. 6 in expression.
Fig. 9 is the lateral sectional view that expression covers the fluorescent film state on the inwall of resulting fluorescent tube in the step shown in Figure 6.
Figure 10 is the profile of expression use based on other execution modes of the planar light source device of discharge tube of the present invention.
Figure 11 is expression limiting member and the forward profile that grips the detailed formation of sheet.
Figure 12 is the stravismus profile of expression Figure 11.
Symbol description: 1: discharge tube; 2: fluorescent tube; 2a: both ends; 2b: pars intermedia; 2c: connecting portion; 2d: reducing diameter part; 2e: wide diameter portion; 3: enclosure space; 4: electrode; 5: the fluorescent film; 6: leading-out portion; 7: bury portion underground; 8: bulge; 9: terminal component; 10: outside terminal; 11: cupule; 20: planar light source device; 21: reflector; 21a: reflecting surface; 21b: grip sheet (fixed cell); 22: light guide plate; 22a: end face; 23: limiting member (limiting unit); 23a: support portion; 23b: extension; 23c: notch part; 30: finishing die; 31: patrix; 32: counterdie; 31a, 32a: half-cylindrical concave surface; 31b, 32b: semiellipse cylindrical concave; 31c, 32c: taper concave surface; 33,34: fixed die; 33a: gas supply orifice; 34a: tabular surface
Embodiment
Below referring to figs. 1 through Fig. 9 explanation execution mode based on discharge tube of the present invention.In addition, with reference to Figure 10 and Figure 11 the execution mode of use based on the planar light source device of discharge tube of the present invention is described.
As shown in Figures 1 to 4, the discharge tube of present embodiment (1) comprising: form and take in the fluorescent tube (2) of discharge with the glass of the enclosure space (3) of gas; Airtightly be fused to the two ends of fluorescent tube (2) and be disposed at pair of electrodes (4) in the enclosure space (3), be covered in the fluorescent film (5) of the internal face of fluorescent tube (2).Fluorescent tube (2) comprising: the both ends (2a) that electrode (4) are installed and have circular annular cross-section; Be formed between the both ends (2a) with the elliptical annular section, and the area of section radially is less than the pars intermedia (2b) of both ends (2a); The connecting portion (2c) that connects both ends (2a) and pars intermedia (2b).The girth of the pars intermedia (2b) of fluorescent tube (2) equals the girth of both ends (2a) in fact.Connecting portion (2c) comprising: diameter from both ends (2a) to the diminishing reducing diameter part of pars intermedia (2b) (2d); Form the interval and be connected in reducing diameter part (2d) to circumferencial direction from this reducing diameter part (2d), and the diameter wide diameter portion (2e) that (2a) enlarges gradually to pars intermedia (2b) from both ends.In addition, the length (L of the pars intermedia (2b) of fluorescent tube (2)
B) be longer than the summation (L of the length at both ends (2a)
A1+ L
A2).
In the enclosure space (3) of fluorescent tube (2), for example be filled with gases such as rare gas such as in the past argon gas and mercury vapor, come as discharge gas.Electrode (4) comprising: for example by the formed leading-out portion of nickel (6); For example by the formed portion (7) that buries underground of tungsten; Form cupule (11) with the cup-shaped of an end of cylinder sealing.In addition, the electrode of cylindric (sleeve shape) can be set also, replace cupule (11).As shown in Figure 5, the internal diameter (W of cupule (11)
1) greater than the shortest diameter (W of the pars intermedia (2b) of fluorescent tube (2)
2).Leading-out portion (6) is fused to an end of the portion of burying underground (7) by electric resistance welding etc., forms bulge (8) on this weld.Leading-out portion (6) and bury portion (7) underground and constitute terminal component (9).To shown in Figure 4, leading-out portion (6) is derived to the outside from the both ends (2a) of fluorescent tube (2), is connected in outside terminal (10) via scolding tin as Fig. 2.Therefore, it is desirable to leading-out portion (6) forms with welding characteristic good metal such as nickel.Go up the both ends (2a) that welding has fluorescent tube (2) burying portion (7) underground, the end side on this one side is directed in the inside of fluorescent tube (2).Therefore, it is desirable to the portion that buries underground (7) to form by the metal that has good a connecting airtight property with the material that constitutes fluorescent tube (2).For example, it is desirable to and the tungsten of glass material, be used as forming the material of burying portion (7) underground with good connecting airtight property with the ultraviolet effect of blocking.Cupule (11) forms cup-shaped by punch process or extrusion process, and is fused to the other end of the portion of burying underground (7) by electric resistance welding etc.Fluorescent film (5) is accepted to emit visible light by the ultraviolet irradiation that discharge produced between the pair of electrodes (4).
Discharge tube (1) according to present embodiment can obtain following effect.
Because the area of section of the pars intermedia (2b) of non-circular annular cross-section less than the both ends (2a) of circular annular cross-section, therefore can increase at the current density ratio fluorescent tube in the past of bringing into play the tube current that flows through in the pars intermedia (2b) of function as light-emitting zone, therefore can improve the luminosity of discharge tube (1).
2. can in the both ends that form the fluorescent tube of circular annular cross-section (2) (2a), be configured to the electrode (4) of past circular section.In addition, because the girth of the pars intermedia (2b) of fluorescent tube (2) equates with the girth of both ends (2a) in fact, therefore, for example can adopt pars intermedia (2b) to heat the simple processing of it being carried out pressurizing and deformation to the fluorescent tube (2) of circular annular cross-section, easily form the fluorescent tube (2) of shape shown in Figure 1, can be at the discharge tube that high brightness is provided cheaply.
3. because the electrode (4) of circular section is set on the both ends of circular annular cross-section (2a), therefore, even electrode (4) is maximized, on also can be around electrode (4) whole, fully guarantee the distance between the internal face of cupule (11) and fluorescent tube (2), therefore can suppress the melanism of the discharge tube (1) that causes by the deposition of the amalgam that sputter produced of electrode (4).So high brightness and the long-life that can seek discharge tube (1).Particularly,, therefore can fully guarantee the distance of cupule (11) with the pars intermedia (2b) of fluorescent tube (2) of electrode (4), therefore can reach melanism more well and suppress effect because connecting portion (2c) forms taper.
4. because the diameter (W of the cupule (11) of electrode (4)
1) greater than the shortest diameter (W of the pars intermedia (2b) of fluorescent tube (2)
2), so electronics flows near the central authorities of fluorescent tube (2) and cupule (11).Therefore, can suppress electronics and emit from the side of cupule (11), more high level ground obtains melanism and suppresses effect, and realizes high brightnessization well.
The manufacture method of discharge tube shown in Figure 1 (1) next is described.At first prepare fluorescent tube (2) with circular annular cross-section.Then, as Figure 6 and Figure 7, the fluorescent tube (2) that will have circular annular cross-section is disposed in the finishing die (30).As shown in Figure 6, finishing die (30) comprises patrix (31), counterdie (32) and a pair of fixed die (33,34).Configuration patrix (31) and counterdie (32) make between each fixed die (33,34) with the both ends of the surface butt of fluorescent tube (2) and can approachingly mutually reach the space.On the contact-making surface of patrix (31) and counterdie (32), form respectively: the half-cylindrical concave surface (31a, 32a) that the both ends (2a) of fluorescent tube (2) is formed circular annular cross-section; The pars intermedia (2b) of fluorescent tube (2) is formed the semiellipse cylindrical concave (31b, 32b) of elliptical annular section; Between half-cylindrical concave surface (31a, 32a) and semiellipse cylindrical concave (31b, 32b) and form the taper concave surface (31c, 32c) of the connecting portion (2c) of fluorescent tube (2).Therefore, when closing patrix (31) and counterdie (32), in finishing die (30), form the container (space) consistent with the shape of the fluorescent tube that should form (2).In addition, on the fixed die (33) of a side, be formed with, on the fixed die (34) of opposite side, be formed with the tabular surface (34a) of the other end of sealing fluorescent tube (2) from the gas supply hole (33a) of end supply gas in fluorescent tube of fluorescent tube (2).In patrix (31) and counterdie (32), be built-in with the not shown heater of heating fluorescent tube (2).
As Figure 6 and Figure 7, configuration fluorescent tube (2) afterwards in finishing die (30), heat fluorescent tube (2) by the not shown heater that is built in patrix (31) and counterdie (32), in fluorescent tube (2), supply with the gas that is blown into of air after the pressurization or non-active gas etc. simultaneously from the gas supply orifice (33a) of the fixed die (33) of a side, to prevent fluorescent tube (2) being broken because of applying external force.Afterwards, as shown in Figure 8, make patrix (31) and counterdie (32) near each other and close patrix (31) and counterdie (32), in finishing die (30) Guan Mo, in fluorescent tube (2), supply with the gas that is blown into after the more pressurization.Thus, when the both ends (2a) of fluorescent tube (2) remain circular annular cross-section, the top and the bottom of the pars intermedia (2b) of fluorescent tube (2), produce the also hole enlargement of expanding because of being blown into gas, the left and right sides of pars intermedia (2b) is because of the undergauge of pushing of patrix (31) and counterdie (32) simultaneously, therefore, pars intermedia (2b) forms the elliptical annular section.Meanwhile, form inclined plane shape or curved shape, (2a) and is connected in reducing diameter part (2d) and (2a) enlarges gradually to pars intermedia (2b) from both ends wide diameter portion (2e) to the diminishing reducing diameter part of pars intermedia (2b) (2d) to the connecting portion (2c) that described inclined plane shape or curved shape have fluorescent tube (2) from both ends.After fluorescent tube (2) hardening by cooling, make patrix (31) and the spaced-apart interval of counterdie (32) and open patrix (31) and counterdie (32), from finishing die (30), take out fluorescent tube (2), so can obtain the fluorescent tube (2) of profile shown in Figure 1.Like this, preferably by patrix (31) and counterdie (32) with the pars intermedia (2b) of fluorescent tube (2) to undergauge when pushing, by gas-pressurized make on one side pars intermedia (2b) to patrix (31) and counterdie (32) push the rectangular hole enlargement of direction to expansion, Yi Bian carry out the shaping that is blown into of gas-pressurized.Certainly, except the patrix (31) and counterdie (32) that carry out Guan Mo and die sinking in vertical direction, can also use to the move left and right of horizontal direction and carry out die sinking and close a pair of mould of forming by the 1st mould and the 2nd mould of mould.
After the fluorescent tube (2) that forms profile shown in Figure 1 taken out from finishing die (30), make the flow of liquid that comprises fluorescent substance cross the wall of fluorescent tube (2), as shown in Figure 9, on the internal face of fluorescent tube (2), cover fluorescent film (5).Also can on the wall of fluorescent tube (2), form the shaping that is blown into that fluorescent film (5) carries out fluorescent tube (2) afterwards again, replace the mode that fluorescent tube (2) is blown into the back formation fluorescent film (5) that is shaped.Then,, be inserted in the not shown sealable container being coated with the fluorescent tube (2) of fluorescent film (5) on the wall, make the portion that buries underground (7) of pair of electrodes (4) and cupule (11) subtend in the both ends of fluorescent tube (2) (2a) and be disposed at coaxial on.Afterwards, closed container, and the discharge that will for example comprise rare gas such as argon gas and mercury vapor with gas filling in fluorescent tube (2), by being fused in the portion that buries underground (7) of pair of electrodes (4) with being arranged at the two ends with fluorescent tube (2) such as electric furnace in the container, seal the two ends of fluorescent tube (2), and the cupule (11) of pair of electrodes (4) is sealed in the fluorescent tube (2).
In the manufacture method of the discharge tube (1) of present embodiment, when the pars intermedia (2b) that finishing die (30) pass mould is made fluorescent tube (2) forms the elliptical annular section, because supply gas (air) pressurizes in fluorescent tube (2), therefore the shape of fluorescent tube (2) can not lost shape, therefore pars intermedia (2b) can be formed the shape of the container that meets finishing die (30), can form thickness evenly and have a pars intermedia (2b) of the fluorescent tube (2) of elliptical annular section.
For example, can be applicable to the planar light source device (20) of end face illumination shape shown in Figure 10 with Fig. 1 to discharge tube (1) shown in Figure 9.As shown in figure 10, the planar light source device of present embodiment (20) comprising: 2 discharge tubes (1) that axially are provided with parallel to each other with shape shown in Figure 1 and fluorescent tube; Parallel with 2 discharge tubes (1), and the reflector (21) that disposes from reflecting surface (21a) devices spaced apart that forms in inside of each discharge tube (1); Light guide plate (22) with the configuration of 2 discharge tubes (1) subtend.The longest diameter of the pars intermedia (2b) of the fluorescent tube (2) of each discharge tube (1) is parallel to the plane C vertical with the end face (22a) of light guide plate (22), for example tilts with same angle θ (0 °≤θ≤90 °).But when angle θ was excessive, then because overall dimension is thicker than the planar light source device of use discharge tube in the past, so tilt angle theta was subjected to the restriction of the shape of fluorescent tube (2).In 2 discharge tubes (1), when the pars intermedia (2b) of each fluorescent tube (2) carries out forward projection for the end face (22a) of light guide plate (22), form and repeat Projection Division A, and repetition Projection Division A, with ratio A/B, preferably dispose fluorescent tube (2) with 0≤(A/B)≤0.5 scope for the B of oblique projection portion of the pars intermedia (2b) of the fluorescent tube (2) of the end face (22a) of light guide plate (22).In addition, the tube hub axle O by 2 discharge tubes (1)
1, O
2Plane D, can might not be parallel to the end face (22a) of light guide plate 22 as shown in the figure.And then, extremely shown in Figure 12 as Figure 11, in 2 discharge tubes (1), will be installed on the pars intermedia 2b of fluorescent tube (2) separately as supporting pars intermedia (2b) and keeping the limiting member (23) of eyelid retractor (limiting unit) of mounting inclination angle θ of the longest diameter of pars intermedia (2b).On the other hand, on the reflecting surface (21a) of reflector (21), a pair of gripping sheet (21b) that is formed with 2 groups is as the fixed cell of fixing the limiting member (23) on the pars intermedia (2b) that is installed on 2 discharge tubes (1) separately.Limiting member (23) comprising: have notch part (23c) and surround the support portion (23a) of ring-type over half of the pars intermedia (2b) of discharge tube (1); (23a) extends to the radial outside of discharge tube (1) from the support portion, is held in the extension (23b) of a pair of gripping sheet (21b) of reflector (21).Can form by higher resins of transparency such as for example acrylic resins.In addition, limiting member (23) also has the effect that can suppress because of the destruction that vibration produced of fluorescent tube (2).In Figure 10, more clear and definite for the configuration relation that makes 2 discharge tubes (1) and reflector (21), omit limiting member (23) and gripped the diagram of sheet (21b).
Planar light source device (20) according to present embodiment can obtain following effect.
1. because from discharge tube (1), narrow down at the taking-up face of directly going up the light that reflects with the reflecting surface (21a) of the reflector (21) of end face (22a) subtend of light guide plate (22), therefore can be reduced in the light of repeated reflection between reflector (21) and the discharge tube (1), and effectively utilize the light of emitting from discharge tube (1).
2. as shown in figure 10, under the situation of pars intermedia (2b) to end face (22a) the formation repetition Projection Division A of light guide plate (22) of 2 discharge tubes (1), but the thickness of thinning reflector (21) and light guide plate (22) not only, and, the light reflectings surface (21a) overlapping and in reflector (21) that produced owing to the pars intermedia (2b) from 2 discharge tubes (1) reflect, and therefore can realize planar light source device slim, high brightness.
3. on the pars intermedia (2b) of 2 discharge tubes (1), limiting member (23) is installed respectively, simultaneously with the extension (23b) of each limiting member (23), be clamped on 2 groups the gripping sheet (21b) that is arranged on the reflector (21), and 2 discharge tubes (1) are fixed in the reflector (21), therefore, can easily make the pars intermedia (2b) of 2 discharge tubes (1) with desired angle tilt and fixing.
The present invention's execution mode is not limited to above-mentioned execution mode, can carry out various changes.For example, in Fig. 1 to Fig. 9, expression possesses the fluorescent tube (2) of the pars intermedia (2b) of elliptical annular section, but the section shape of the pars intermedia (2b) of fluorescent tube (2), can comprise semicircular D i section etc. for comprising so-called oval-shaped Long Circle section.In addition, in Figure 10 to Figure 12, represent that 2 discharge tubes (1) that the axial center line of fluorescent tube is parallel each other are disposed at the example in the reflector 21, but the number of discharge tube (1) is not limited to 2, also can be more than or equal to 3.In addition, in Figure 11 and Figure 12, express limiting member (23), this limiting member (23) possesses: have notch part (23c) and surround the support portion (23a) of ring-type over half of the pars intermedia (2b) of discharge tube (1); (23a) extends to the radial outside of discharge tube (1) from the support portion, and is held in the extension (23b) of a pair of gripping sheet (21b) of reflector (21).But also can use, possess the aperture portion of the pars intermedia (2b) that is inserted in discharge tube (1) or surround the recess over half of the pars intermedia (2b) of discharge tube (1), and the limiting member that forms as one with reflector (21).In addition, express tube hub axle O by 2 discharge tubes (1)
1, O
2Plane D with respect to the uneven example of end face (22a) of light guide plate (22), but also can make tube hub axle O by 2 discharge tubes (1)
1, O
2Plane D dispose 2 discharge tubes (1) abreast with respect to the end face (22a) of light guide plate (22).In addition, the discharge tube (1) of planar light source device (20) can be configured to 1, in this case, if a end with the longest diameter of the fluorescent tube (2) of discharge tube (1), subtend is disposed on the end face (22a) of light guide plate (22), then can similarly realize with situation as shown in figure 10 than the planar light source device of more slim, high brightness in the past.In addition, the present invention's discharge tube (1) is not only applicable to the straight shape pipe shown in the figure, applicable to the fluorescent discharge pipe of the bend that possesses U-shaped pipe or L shaped pipe etc. yet.And then the present invention is also applicable to the cold cathode type germicidal tube that does not form fluorescent film (5) on the internal face of fluorescent tube (2).
The present invention applicable to, for example be loaded in slim and be employed discharge tube in the planar light source device such as backlight of the liquid crystal indicator of big picture.
Claims (8)
1. discharge tube possesses the fluorescent tube that forms enclosure space and is fixed in the two ends of this fluorescent tube and is disposed at pair of electrodes in the above-mentioned enclosure space, voltage is put between the above-mentioned pair of electrodes make it luminous, and described discharge tube is characterised in that:
Above-mentioned fluorescent tube comprises:
Both ends dispose above-mentioned electrode and have circular annular cross-section;
Pars intermedia, with non-circular annular cross-section be formed between the above-mentioned both ends and the area of section radially less than above-mentioned both ends;
Connecting portion connects above-mentioned both ends and above-mentioned pars intermedia, wherein
Above-mentioned electrode has cupule or the cylindrical portion of short diameter of diameter greater than the pars intermedia of above-mentioned fluorescent tube.
2. the discharge tube of putting down in writing according to claim 1 is characterized in that:
The girth of above-mentioned pars intermedia equals the girth at above-mentioned both ends.
3. the discharge tube of putting down in writing according to claim 1 is characterized in that:
Above-mentioned connecting portion comprises:
Reducing diameter part, from above-mentioned both ends to above-mentioned pars intermedia diameter reduction little by little; And
Wide diameter portion, from this reducing diameter part to the circumferencial direction devices spaced apart and be connected in above-mentioned reducing diameter part, from above-mentioned both ends to above-mentioned pars intermedia enlarged diameter little by little.
4. according to claim 1 each discharge tube of putting down in writing to the claim 3, it is characterized in that:
The length of the above-mentioned pars intermedia of above-mentioned fluorescent tube is also longer than the summation of the length at above-mentioned both ends.
5. planar light source device possesses: claim 1 each discharge tube of putting down in writing to the claim 4; The reflector that disposes from above-mentioned discharge tube devices spaced apart; Have the light guide plate of the end face that disposes with above-mentioned discharge tube subtend, described planar light source device is characterised in that:
Make the end of longest diameter of the fluorescent tube of above-mentioned discharge tube, with the end face subtend configuration of above-mentioned light guide plate.
6. planar light source device possesses: claim 1 each a plurality of discharge tubes of putting down in writing to the claim 4; The reflector that disposes from above-mentioned discharge tube devices spaced apart; Have the light guide plate of the end face that disposes with above-mentioned each discharge tube subtend, described planar light source device is characterised in that:
Make the longest diameter of the fluorescent tube of above-mentioned discharge tube, for the plane parallel crustal inclination vertical with the end face of above-mentioned light guide plate.
7. planar light source device possesses: claim 1 each a plurality of discharge tubes of putting down in writing to the claim 4; The reflector that disposes from this each discharge tube devices spaced apart; Have the light guide plate of the end face that disposes with above-mentioned each discharge tube subtend, described planar light source device is characterised in that:
The pars intermedia of the fluorescent tube of above-mentioned each discharge tube when the face to the end face that comprises light guide plate carries out the forward projection, forms and repeats the Projection Division.
8. the planar light source device of putting down in writing according to claim 6 or claim 7 is characterized in that:
Pars intermedia at above-mentioned fluorescent tube is equipped with the pars intermedia of the fluorescent tube that supports above-mentioned discharge tube and limits the restrictions at the angle of inclination of above-mentioned pars intermedia.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004162054A JP4366655B2 (en) | 2004-05-31 | 2004-05-31 | Discharge tube |
| JP162054/2004 | 2004-05-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1906730A CN1906730A (en) | 2007-01-31 |
| CN100538992C true CN100538992C (en) | 2009-09-09 |
Family
ID=35451131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800016899A Expired - Fee Related CN100538992C (en) | 2004-05-31 | 2005-03-28 | Discharge tube and the planar light source device that uses discharge tube |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4366655B2 (en) |
| KR (1) | KR100796887B1 (en) |
| CN (1) | CN100538992C (en) |
| TW (1) | TW200605136A (en) |
| WO (1) | WO2005117066A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004027997A1 (en) * | 2004-06-09 | 2005-12-29 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Method and device for producing a lamp |
| KR101311676B1 (en) | 2005-12-30 | 2013-09-25 | 엘지디스플레이 주식회사 | Lamp, back light unit and liquid crystal display using the back light unit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2267118A (en) * | 1940-03-01 | 1941-12-23 | Westinghouse Electric & Mfg Co | Fluorescent tube |
| CN2389417Y (en) * | 1999-09-20 | 2000-07-26 | 葛世潮 | Large power cold cathode fluorscent lamp |
| CN1661766A (en) * | 2004-02-25 | 2005-08-31 | 松下电器产业株式会社 | Cold-cathode fluorescent lamp and backlight unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2961565A (en) * | 1954-12-14 | 1960-11-22 | Gen Electric | Low-pressure discharge lamp |
| JPH04312755A (en) * | 1991-04-11 | 1992-11-04 | Seiko Epson Corp | Discharge lamp and flat light source using the same and liquid crystal display using it |
| JPH0589835A (en) * | 1991-09-27 | 1993-04-09 | Toshiba Lighting & Technol Corp | Ultraviolet ray source and ultraviolet irradiation device |
| JP3130402B2 (en) * | 1993-02-05 | 2001-01-31 | キヤノン株式会社 | Edge type backlight device and liquid crystal device using the same |
| JP2000260216A (en) * | 1999-03-11 | 2000-09-22 | Mitsubishi Electric Corp | Lighting system |
| JP4011428B2 (en) * | 2002-07-25 | 2007-11-21 | ハリソン東芝ライティング株式会社 | Cold cathode discharge lamp and backlight unit |
-
2004
- 2004-05-31 JP JP2004162054A patent/JP4366655B2/en not_active Expired - Fee Related
-
2005
- 2005-03-28 WO PCT/JP2005/005689 patent/WO2005117066A1/en active Application Filing
- 2005-03-28 KR KR1020067009268A patent/KR100796887B1/en not_active IP Right Cessation
- 2005-03-28 CN CNB2005800016899A patent/CN100538992C/en not_active Expired - Fee Related
- 2005-04-11 TW TW094111360A patent/TW200605136A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2267118A (en) * | 1940-03-01 | 1941-12-23 | Westinghouse Electric & Mfg Co | Fluorescent tube |
| CN2389417Y (en) * | 1999-09-20 | 2000-07-26 | 葛世潮 | Large power cold cathode fluorscent lamp |
| CN1661766A (en) * | 2004-02-25 | 2005-08-31 | 松下电器产业株式会社 | Cold-cathode fluorescent lamp and backlight unit |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060085959A (en) | 2006-07-28 |
| CN1906730A (en) | 2007-01-31 |
| JP4366655B2 (en) | 2009-11-18 |
| JP2005346952A (en) | 2005-12-15 |
| TW200605136A (en) | 2006-02-01 |
| TWI300577B (en) | 2008-09-01 |
| KR100796887B1 (en) | 2008-01-22 |
| WO2005117066A1 (en) | 2005-12-08 |
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