CN101515535A - Rare gas fluorescent lamp - Google Patents
Rare gas fluorescent lamp Download PDFInfo
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- CN101515535A CN101515535A CNA2009100059288A CN200910005928A CN101515535A CN 101515535 A CN101515535 A CN 101515535A CN A2009100059288 A CNA2009100059288 A CN A2009100059288A CN 200910005928 A CN200910005928 A CN 200910005928A CN 101515535 A CN101515535 A CN 101515535A
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- luminescent coating
- injection part
- luminous tube
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Abstract
The invention provides a rare gas fluorescent lamp capable of improving light output without increasing input power. A luminous tube (1) has an inner surface fluorescence body layer (2), and is filled with rare gas with stimulated quasi molecule generated by medium blocking discharge, has two electrodes for inducing discharge phenomenon in the rear gas; the dielectric body is disposed between the rear gas and at least one of the two electrodes; and an area extended along the axial direction of the tube between the two electrodes is used as light ejaculating part (4). The invention is characterized in: the whole inner surface of the luminous tube is formed with fluorescence body layer; and the fluorescence body layer on the light ejaculating part is thinner than that on other positions; further, the inner surface of the luminous tube excluding the light ejaculating part is formed with a first fluorescence body layer (20); both the surface of the first fluorescence body layer and the inner surface of the light ejaculating part are formed with a second fluorescence body layer (21).
Description
Technical field
The present invention relates to a kind of noble gas fluorescent lamp.Be particularly related to the noble gas fluorescent lamp of the original copy irradiation unit of OA machines such as being applied to facsimile machine, image analyzer, photocopier.
Background technology
In the past, the noble gas fluorescent lamp that utilizes in the original copy irradiation unit is enclosed in the luminous tube that is made of elongated glass tube rare gas, its inner face has luminescent coating, outer electrode to a pair of band shape of the outside that is formed on luminous tube applies voltage, in luminous tube, generate excimers, obtain visible light by the ultraviolet ray excited fluorophor that produces by these excimers by dielectric barrier discharge.
Such noble gas fluorescent lamp has and do not use mercury, and is therefore little to carrying capacity of environment, and the advantage rapidly that rises.
Fig. 5 (a) is the skeleton diagram of noble gas fluorescent lamp in the past, and Fig. 5 (b) is the profile with the tubular axis orthogonal direction.
Noble gas fluorescent lamp is formed with luminescent coating 2 at the inner face of the luminous tube 1 of straight tube-like, has the outer electrode 3 of a pair of band shape of extending to tube axial direction in the outside of luminous tube 1.
In luminous tube 1, enclose the xenon for example have as rare gas, make and cause discharge in the luminous tube 1, and produce ultravioletly, and radiate visible light by ultraviolet ray excited fluorophor by between outer electrode 3, applying high-frequency high-voltage.
Such noble gas fluorescent lamp make light to specific direction, for example, in master copy lighting device, go out Line of light to original copy mounting glassine, as shown in Figure 5, on the zone that tube axial direction extends, there is not luminescent coating 2 between the pair of external electrodes 3, this zone becomes the light injection part 4 as opening, and the visible light of changing via luminescent coating 2 penetrates from this light injection part 4.
Further, be used to guarantee the insulation between the outer electrode 3, cover the dielectric film 5 of light transmission in the outside of luminous tube 1, so that cover outer electrode 3.
Patent documentation 1: Japanese kokai publication hei 11-213956 communique
The structure of master copy lighting device is, will be mapped to from the illumination that noble gas fluorescent lamp penetrates on the original copy face, by CCD this reverberation is subjected to light, and converts the signal of telecommunication to and obtain image.
Recently, the reading speed of original copy face accelerates, and the result causes the tendency of CCD in the light quantity minimizing that is subjected to light of time per unit.
Moreover, require the master copy lighting device miniaturization to strengthen all the more, the accommodation space of CCD is narrowization thereupon also, has to use more small-sized CCD, because such requirement, the tendency that also causes CCD to reduce in the light quantity that is subjected to light of time per unit.
As a result, in existing noble gas fluorescent lamp, the light quantity of the be subjected to light of CCD reduces, and obtains optimum image and becomes difficult.
For the light quantity of the be subjected to light that increases CCD, have raising to the input power of noble gas fluorescent lamp, improve the method for light output.
Yet the temperature of luminous tube rises when improving input power, the problem of luminescent coating premature deterioration occurs, perhaps is necessary to change the formation of lamp circuit, is difficult to corresponding by only improving input power.
Summary of the invention
The present invention carries out in order to address the above problem, and its purpose is to provide a kind of noble gas fluorescent lamp that input power also can improve light output that do not improve.
According to technical scheme 2 described noble gas fluorescent lamps, it is characterized in that, it is technical scheme 1 described noble gas fluorescent lamp, particularly, be formed with the 1st luminescent coating at the inner face that is positioned at above-mentioned smooth injection part above-mentioned luminous tube in addition, on the surface of above-mentioned the 1st luminescent coating and be positioned on the inner face of luminous tube of above-mentioned smooth injection part, be formed with the 2nd luminescent coating.
The invention effect
Noble gas fluorescent lamp of the present invention has the luminescent coating that spreads all over full week at the inner face of luminous tube, by on the zone that is positioned at the light injection part, forming luminescent coating, can make the ultraviolet full illumination that in luminous tube, produces to fluorophor, can also increase the generating capacity of visible light.
Further, the film thickness of luminescent coating that is positioned at the light injection part is than the thin film thickness that is positioned at the luminescent coating beyond the light injection part, therefore, from the luminescent coating of this thin film thickness of visible light transmission of the luminescent coating self that is positioned at light injection part radiation and to external irradiation, and because it is thick to be positioned at the film thickness of the luminescent coating beyond the light injection part, and make from the thick luminescent coating of this film thickness of not transmission of visible light of the thick luminescent coating of this film thickness radiation and to the radiation of the inner space of luminous tube, transmission be positioned at the light injection part thin film thickness luminescent coating and to outside radiation, can not improve input power and improve light output from noble gas fluorescent lamp.
Further, be formed with the 1st luminescent coating at the inner face that is positioned at light injection part luminous tube in addition, on the surface of the 1st luminescent coating and be positioned on the part that spreads all over two sides on the inner face of luminous tube of light injection part and be formed with the 2nd luminescent coating, therefore, can make the film thickness of the luminescent coating that is positioned at the light injection part than the thin film thickness that is positioned at light injection part luminescent coating in addition reliably.
Description of drawings
Fig. 1 is the approximate three-dimensional map of noble gas fluorescent lamp of the present invention.
Fig. 2 is the profile of the A-A of noble gas fluorescent lamp shown in Figure 1.
Fig. 3 is the key diagram of the structure of the luminescent coating in the expression noble gas fluorescent lamp shown in Figure 1.
After Fig. 4 is the film thickness of luminescent coating of the expression inner face that changes the luminous tube be formed on the light injection part that is positioned at noble gas fluorescent lamp, the data declaration of the variation of the light output of noble gas fluorescent lamp.
Fig. 5 is the approximate three-dimensional map and the cutaway view of noble gas fluorescent lamp in the past.
Description of symbols
1, luminous tube
2, luminescent coating
3, outer electrode
4, light injection part
5, dielectric film
Embodiment
Below, utilize the accompanying drawing of discharge lamp of the present invention to describe.
Fig. 1 is the schematic isometric of noble gas fluorescent lamp of the present invention, and Fig. 2 is the profile of the A-A of noble gas fluorescent lamp shown in Figure 1.
The luminous tube 1 of noble gas fluorescent lamp is to be made of the glass as the light transmission of dielectric, can enumerate for example soda-lime glass, alumina silicate glass, Pyrex, barium glass etc. as its material.On the outside of luminous tube 1, the outer electrode 3 of a pair of band shape that is made of the electrode at the two poles of the earth is configured to extend to the tube axial direction of this luminous tube 1.As in the profile vertical shown in Figure 2, these outer electrodes 3 are disposed opposed to each other with tubular axis.
The material of outer electrode 3 is if then not restriction especially of conductive material is for example pasted by the outside at luminous tube 1, and Al (aluminium), Cu metal bands such as (copper) perhaps carry out screen painting with silver conductive adhesive and formation with burning till.
Inner face at luminous tube 1 spreads all over the full luminescent coating 2 that is formed with allly, the part that does not have luminescent coating that does not illustrate in technology in the past.
Red-emitting phosphors in the fluorophor is europium active oxidation yttrium fluorophor (Y
2O
3: Eu), green-emitting phosphor is cerium terbium activation phosphoric acid lanthanum fluorescence body (LaPO
4: Ce, Tb), blue emitting phophor is europium activation barium magnesium aluminate as fluorescent substance (BaMgAl
10O
17: Eu).
In order to ensure the insulation between the outer electrode 3, cover the dielectric film 5 of light transmission in the outside of luminous tube 1, so that cover outer electrode 3.
In the inside of luminous tube 1, with for example Xe (xenon) gas, the scope that the mist that perhaps contains the rare gas of Xe is 5～100kPa with full inclosure pressure is enclosed.
When lighting a lamp power supply when outer electrode 3 applies high frequency voltage by not shown, be created in the dielectric barrier discharge that is mingled with between the outer electrode 3 as the luminous tube 1 of dielectric, produce the excimers luminous (ultraviolet ray) of xenon by this discharge.
Such noble gas fluorescent lamp is when by lighting a lamp power supply when outer electrode 3 applies high frequency voltage, and producing wavelength in luminous tube 1 is the ultraviolet ray of 172nm, and this ultraviolet ray is to the fluorophor irradiation of luminescent coating 2 and excite, thus the radiation visible light.
In this noble gas fluorescent lamp, between pair of external electrodes 3, become light injection part 4 along the zone that tube axial direction extends, the luminescent coating 2 that regional a being arranged in light injection part 4 shown in Figure 2 forms, emit visible light by ultraviolet ray excited fluorophor, but the visible light that this quilt radiates is to the radiation of the inner space of luminous tube 1, and transmission luminescent coating 2 is to the radiation of the outside of luminous tube 1.
And, be arranged in the luminescent coating 2 that light injection part 4 regional b in addition forms, emit visible light by ultraviolet ray excited fluorophor, this visible light of being radiated is the luminescent coating 2 of regional transmission b and to the radiation of the inner space of luminous tube 1 not roughly, reflect repeatedly on one side at luminescent coating 2, on one side final transmission be formed on the luminescent coating 2 of regional a and to the radiation of the outside of luminous tube 1.
In noble gas fluorescent lamp in the past, the inner face that is positioned at the luminous tube of light injection part does not have luminescent coating, the luminous tube of visible light transmission light transmission penetrates to the outside, but, noble gas fluorescent lamp of the present invention is for to have the structure of the luminescent coating 2 that spreads all over full week at the inner face of luminous tube 1, also is formed with the luminescent coating 2 that spreads all over regional a at the inner face of the luminous tube 1 that is positioned at light injection part 4.
In the past, the ultraviolet ray that shines this zone a is not used in excited fluophor, in the present invention, can be used in excited fluophor by forming luminescent coating 2 at this zone a, and can increase the generating capacity of visible light, and, make the visible light transmission be formed on the luminescent coating 2 of regional a, therefore, not improving input power also can improve from the output of the light of noble gas fluorescent lamp.
Then, luminescent coating is elaborated.
Fig. 3 is in noble gas fluorescent lamp shown in Figure 1, and the profile of that be used for luminescent coating is described and the direction tubular axis quadrature is represented the thickness of luminescent coating large in order to describe.
Manufacture method to luminescent coating 2 describes.
Afterwards, be formed on light injection part 4 opposed parts on luminescent coating 20 cut, remove luminescent coating 20, expose the inner face of luminous tube 1.
Further, on the inner face of the luminous tube 1 of the state that is formed with luminescent coating 20 on the part of the inner face of luminous tube 1, the suspension of fluorophor that will contain regulation is after full Zhou Jinhang coating, and is dry, burn till and form luminescent coating 21.
The result, be positioned on the inner face of luminous tube 1 of light injection part 4 and become the state that only is formed with the 2nd luminescent coating 21, being positioned at becomes the 1st luminescent coating 20 state stacked with the 2nd luminescent coating 21 on the inner face of the luminous tube 1 beyond the light injection part 4, the film thickness that can make the luminescent coating 2 that is positioned at light injection part 4 is than the thin film thickness that is positioned at light injection part 4 luminescent coating 2 in addition.
Then, the luminescent coating 2 that is positioned at light injection part 4 can make from this luminescent coating 21 of visible light transmission of the 2nd luminescent coating 21 self radiation and to external irradiation.
And, being positioned at light injection part 4 luminescent coating 2 in addition and constituting by the 1st luminescent coating 20 and the 2nd luminescent coating 21, the film thickness thickening can suppress the visual optical transmission from this stacked luminescent coating 2, and visible light is reflected to luminous tube.
The film thickness that is positioned at the luminescent coating 21 of light injection part 4 is and self compares from the light quantity of the optical attenuation beyond the light injection part 4 according to this luminescent coating 21, the bigger film thickness of light quantity that obtains from the luminescent coating 21 of light injection part 4.
Being positioned at film thickness that luminescent coating 20 and luminescent coating 21 beyond the light injection part 4 add up to is the thickness of degree of saturation for the light quantity that obtains according to this luminescent coating 20 and luminescent coating 21, and, visible light is transmission luminescent coating 20 and luminescent coating 21 hardly, and then is the film thickness thicker than luminescent coating 21.
Particularly, the film thickness that is positioned at the luminescent coating 2 of light injection part 4 only is the thickness of the 2nd luminescent coating 21, is 8 μ m.And the thickness of the 1st luminescent coating 20 that is positioned at the film thickness of the luminescent coating 2 beyond the light injection part 4 is 48 μ m, and the thickness of the 2nd luminescent coating 21 is 8 μ m, and the film thickness of this luminescent coating 2 is aggregate value of each luminescent coating, is 56 μ m.
According to such noble gas fluorescent lamp, by on the zone that is positioned at light injection part 4, forming luminescent coating 2, can make the ultraviolet full illumination that in luminous tube 1, produces to fluorophor, can also increase the generating capacity of visible light.
Further, the film thickness of 4 luminescent coating 2 that is positioned at the light injection part is than the thin film thickness that is positioned at the luminescent coating 2 beyond the light injection part 4, therefore, visible light from luminescent coating 2 self radiation that is positioned at light injection part 4, the luminescent coating 2 of this thin film thickness of transmission and to external irradiation, and, the film thickness that is positioned at light injection part 4 luminescent coating 2 in addition is thick, therefore, from the visible light luminescent coating 2 that this film thickness of transmission is thick hardly of the thick luminescent coating of this film thickness 2 radiation and to the radiation of the inner space of luminous tube 1, transmission be positioned at light injection part 4 thin film thickness luminescent coating 2 and to outside radiation, can not improve input power and improve light output from noble gas fluorescent lamp.
Further, be formed with the 1st luminescent coating 20 at the inner face that is positioned at light injection part 4 luminous tube 1 in addition, on the surface of the 1st luminescent coating 20 and be positioned on the part that spreads all over two sides on the inner face of luminous tube 1 of light injection part 4 and be formed with the 2nd luminescent coating 21, therefore, can make the film thickness of the luminescent coating 2 that is positioned at light injection part 4 than the thin film thickness that is positioned at light injection part 4 luminescent coating 2 in addition reliably.
In addition, in Fig. 1～Fig. 3, at the luminous tube that is mingled with as the outer electrode of the electrode at the two poles of the earth and between as dielectric as the rare gas of discharge with gas, but also can be following structure, two sides of separately electrode are formed on the inner face of luminous tube, make the electrode of this formation not expose discharge space ground and cover with glass, this glass is dielectric.
Perhaps, can be following structure also, make a certain side's electrode be formed on the outside of luminous tube, the opposing party's electrode is covered by the glass as dielectric of the inner face that is formed on luminous tube.
Then, in noble gas fluorescent lamp of the present invention as shown in Figure 1 and Figure 2, change the thickness of the luminescent coating 2 of the inner face that is formed on the luminous tube 1 that is positioned at light injection part 4, the investigation experiment has been carried out in the change of light output.
Experimental result as shown in Figure 4.
In this experiment, the thickness that is positioned at the 1st luminescent coating 20 beyond the light injection part 4 is that 48 μ m fix, the thickness of the 2nd luminescent coating 21 that will be positioned at light injection part 4 under the situation of the range of 0～16 μ m, the illumination of tube axial direction of position of the place ahead 8mm that is positioned at light injection part 4 as light output estimate.
And, change in the scope of 0～16 μ m by the thickness that makes the 2nd luminescent coating 21, the thickness that is positioned at light injection part 4 luminescent coating 2 is in addition changed in the scope of 48～64 μ m.
The transverse axis epimere of Fig. 4 represents to be positioned at the thickness of the luminescent coating of light injection part 4, and the transverse axis hypomere represents to be positioned at the thickness of the luminescent coating beyond the light injection part 4.
Below the specification of the lamp that will use is in this experiment put in order.Be used in the yellowish green light of the lamp radiation of this experiment as visible light.
＜noble gas fluorescent lamp 〉
Luminous tube: barium glass, external diameter 8mm, internal diameter 7.2mm, total length 700mm
Enclose thing: xenon 30%, neon 70%, 40kPa
The formation of luminescent coating: green-emitting phosphor (La, Ce, Tb) PO
4
Average grain diameter; : 2.1 μ m
In Fig. 4, curve chart a is that expression has changed after the film thickness of the 2nd luminescent coating 21 of the inner face that is formed on the luminous tube 1 that is positioned at light injection part 4, the variation of the light output of noble gas fluorescent lamp.And in this case, the thickness that is positioned at light injection part 4 luminescent coating 2 in addition changes in the scope of 48～64 μ m.
In Fig. 4, curve chart b is the figure that is expressed as follows situation, be used for comparison, make the 2nd luminescent coating 21 at the inner face of the luminous tube 1 that is positioned at light injection part 4, afterwards, only eliminate the 2nd luminescent coating of making 21, be illustrated in light injection part 4 and do not have luminescent coating, the variation of the light output of the noble gas fluorescent lamp of the film thickness that is positioned at the luminescent coating 2 beyond the light injection part 4 under the situation that the scope of 48～64 μ m changes in the part that is positioned at light injection part 4.
In Fig. 4, when curve chart a and curve chart b were compared, shown in curve chart b, in order to increase the light output of noble gas fluorescent lamp, when making the thickness thickening of the luminescent coating 2 beyond the light injection part 4, light output increased.
Yet, shown in curve chart a, the 2nd luminescent coating 21 is set as can be known by inner face at the luminous tube 1 that is positioned at light injection part 4, to compare with the lamp of the thickness thickening that only makes the luminescent coating 2 beyond the light injection part 4 shown in curve chart b, light output further increases.
That is to say, in this experiment, at light injection part 4 luminescent coating 21 is not set, the film thickness that is positioned at light injection part 4 luminescent coating 2 is in addition changed in the scope of 48～64 μ m, the increase of light output is less, at light injection part 4 luminescent coating 21 is set, and by adopting the manufacture method that luminescent coating 21 is set at this light injection part 4, the inevitable scope at 48～64 μ m of film thickness that is positioned at the luminescent coating 2 beyond the light injection part 4 changes, and the increase of light output that is provided with the lamp of luminescent coating 21 at light injection part 4 becomes big.
And the curve chart a from Fig. 4 learns, when the film thickness thickening of the 2nd luminescent coating 21, light output increases, but there is peak value in the increase of light output, and during the film thickness thickening, from the difficult transmission that becomes of the visible light of luminescent coating 21, and light output reduces.
That is to say, inner face at luminous tube 1 spreads all over complete the 1st luminescent coating 20 that forms allly in advance, only the part at light injection part 4 eliminates this luminescent coating 20, afterwards, exposed on the surface of inner face of luminous tube 1 having eliminated the 1st luminescent coating 20 and formation the 2nd luminescent coating 21 on lip-deep two sides of the 1st luminescent coating 20, by controlling the film thickness of the 2nd luminescent coating 21, do not compare with there is the noble gas fluorescent lamp of the relatively usefulness of luminescent coating at light injection part 4, both can make the very simple luminescent coating 2 of structure also can increase light output.
Therefore, by noble gas fluorescent lamp of the present invention being used in the fast master copy lighting device of reading speed of original copy face, can increasing the light quantity that be subjected to light of CCD, and can obtain optimum image at time per unit.
Further, by noble gas fluorescent lamp of the present invention being used in the master copy lighting device that has been miniaturized, even the CCD that has been miniaturized also can increase the light quantity that be subjected to light of CCD at time per unit, and can obtain optimum image.
Claims (2)
1, a kind of noble gas fluorescent lamp has luminescent coating at the inner face of luminous tube, and this luminous tube is filled with the rare gas that generates excimers by dielectric barrier discharge; Described noble gas fluorescent lamp has the electrode at the two poles of the earth that are used to make above-mentioned rare gas induced discharge phenomenon, make between at least one side and above-mentioned rare gas of dielectric in the electrode at above-mentioned the two poles of the earth, make the zone between the electrode at above-mentioned the two poles of the earth become the light injection part along tube axial direction extends, above-mentioned noble gas fluorescent lamp is characterised in that
Inner face at above-mentioned luminous tube spreads all over the complete above-mentioned luminescent coating that is formed with allly,
The film thickness of luminescent coating that is positioned at above-mentioned smooth injection part is than the thin film thickness that is positioned at the luminescent coating beyond the above-mentioned smooth injection part.
2, noble gas fluorescent lamp according to claim 1 is characterized in that,
Be formed with the 1st luminescent coating at the inner face that is positioned at above-mentioned smooth injection part above-mentioned luminous tube in addition,
On the surface of above-mentioned the 1st luminescent coating and be positioned on the inner face of luminous tube of above-mentioned smooth injection part and be formed with the 2nd luminescent coating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP036861/2008 | 2008-02-19 | ||
| JP2008036861A JP2009199734A (en) | 2008-02-19 | 2008-02-19 | Rare gas fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101515535A true CN101515535A (en) | 2009-08-26 |
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ID=41039934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100059288A Pending CN101515535A (en) | 2008-02-19 | 2009-01-20 | Rare gas fluorescent lamp |
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| Country | Link |
|---|---|
| JP (1) | JP2009199734A (en) |
| CN (1) | CN101515535A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5350141B2 (en) | 2009-08-26 | 2013-11-27 | ルネサスエレクトロニクス株式会社 | Level shift circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11120961A (en) * | 1997-10-09 | 1999-04-30 | Harison Electric Co Ltd | Discharge lamp and lighting system |
| DE19858810A1 (en) * | 1998-12-21 | 2000-06-29 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Flat lighting device and operating method |
| JP2003197153A (en) * | 2001-12-27 | 2003-07-11 | Harison Toshiba Lighting Corp | Cold-cathode fluorescent lamp and lighting system |
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| JP2009199734A (en) | 2009-09-03 |
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Open date: 20090826 |