CN1051873C - Low-pressure mercury discharge lamp and illumination panel provided with such a lamp - Google Patents
Low-pressure mercury discharge lamp and illumination panel provided with such a lamp Download PDFInfo
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- CN1051873C CN1051873C CN93106128A CN93106128A CN1051873C CN 1051873 C CN1051873 C CN 1051873C CN 93106128 A CN93106128 A CN 93106128A CN 93106128 A CN93106128 A CN 93106128A CN 1051873 C CN1051873 C CN 1051873C
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- fluorescent tube
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Abstract
The present invention relates to an alternating bending type low-pressure mercury discharge lamp with a cold electrode, particularly to a low-pressure mercury discharge lamp for an illumination plate of a liquid crystal display. In order to obtain good uniform brightness and high luminous efficiency, an alternating bending type tubular lamp tube (1) has the selected structure size that the length of a discharge channel is from 250 times to 1000 times of inner diameter of the lamp tube (1) in the low-pressure mercury discharge lamp. The inner diameter of the lamp tube (1) is preferably from 2.0mm to 3.5mm.
Description
The present invention relates to a kind of low-pressure mercury discharge lamp, it comprises an elongated tubular fluorescent tube with the sealing-in of vacuum seal method, this fluorescent tube and plane parallel bending extension, and its surface scribbles fluorescent material, casing pack comprises the filler of inert gas and mercury, and there is cold electrode at its discharge channel two ends.
The invention still further relates to a kind of illuminatian plate, particularly the illuminatian plate that is exclusively used in LCD that constitutes by this low-pressure mercury discharge lamp.
In the brochure of Harison Electric Co., Ltd this lamp is disclosed, the recommended illuminatian plate that is used for LCD of wherein said this lamp.The external diameter of this lamp is 6.2mm (internal diameter is about 4.3mm), the about 500mm of the length of discharge channel.This lamp is bent to cyclic bending shape, that is, fluorescent tube is made of many substantially parallel arms, and these arms are connected in series mutually, and its center line is in a plane.Existing lamp is suitable for being used in combination with the illuminatian plate of 6 inches display screens, and this just can make the structure height of this illuminatian plate littler than the structure height of the illuminatian plate of the fluorescent lamp formation of similarly using large dia warp.The operating voltage of existing lamp is defined as 530 volts, and lamp current is not more than 6mA, and this is very favourable to being used for battery-powered portable appliance.
Existing lamp is not suitable for the bigger display with the illuminatian plate formation that similarly has less structure height.For obtaining the even illumination of large surface area, need with many described this lamps, this just need set up many independent discharge channels.The quantity increase of lamp causes export license to scale up, and this is very disadvantageous to battery-powered movably liquid crystal display.Yet the lamp of arranging can not guarantee the even illumination of illuminatian plate arbitrarily, because in fact inevitably there is little luminance difference between the lamp.
Task of the present invention provides the lamp that illuminatian plate is used, and its power consumption is very little, and surface illumination is very even, and the small construction height is arranged.
According to the present invention, above-mentioned this low-pressure mercury discharge lamp is characterised in that minimum for the fluorescent tube internal diameter 250 times of the length of discharge channel, is 1000 times of fluorescent tube internal diameter to the maximum.This of lamp has the geometry than the long discharge passage to make the lamp export license lower with respect to internal diameter, that is, make the major part of input power become useful gas discharge.Also can select the shape of lamp, make it to have the considerable arm that is close to mutually, thus the more even light distribution that obtains.
For getting a desired effect, the discharge channel length of above-mentioned fluorescent tube and the ratio of internal diameter are at least 250, and its maximum is 1000.But in fact when surpassing maximum, the operating voltage that lamp requires has just exceeded the upper limit.
In the most preferred embodiment of low-pressure mercury discharge lamp of the present invention, the discharge tube of its alternating bending shape comprises many arms straight, that be parallel to each other basically, and the fluorescent tube internal diameter is at least 2.0mm, and maximum is 3.5mm, preferably 2.5mm.Free distance between the arm of lamp equals the fluorescent tube internal diameter at least, and maximum is 5 times of fluorescent tube internal diameter.The advantage of this lamp is, when being used for illuminatian plate, and obtainable surface illumination and high brightness very uniformly.Illuminatian plate generally includes the flat box at a band end, with parallel the end of with and the light-emitting area of common covering one diffusing panel of certain distance arranged.Because the fluorescent tube internal diameter is little, and the free distance between the arm of fluorescent tube be 5 times of the fluorescent tube internal diameter to greatest extent, and light-emitting area throws light on a large amount of parallel arms, thereby makes the uniformity raising of surface illumination.Because the distance between the arm causes and equals the fluorescent tube internal diameter at least, thereby obtains high brightness.In fact the interval of leaving between the arm is enough to allow the light in the emission of end indicator to pass through in reflection back, end major part.So this light helps to improve the brightness of illuminatian plate.
By among this embodiment of lamp of the present invention, the resistance value of lamp rises De Taigao in order to avoid in actual applications, and the fluorescent tube internal diameter is chosen as and is not less than 2.0mm.On the other hand, in order to make the illuminatian plate that is made of such lamp as far as possible little structure height is arranged, the internal diameter of discharge tube is hanked and is not more than 3.5mm.
Find, select the physical dimension of lamp can make illuminatian plate have surface illumination very uniformly, high brightness and high efficiency, for example 10 candle lights/watt, the structure height of such illuminatian plate is limited to 15mm or littler.
Be also noted that U.S. Pat 4842378 discloses a kind of LCD with illuminatian plate, the discharge lamp of placing in this illuminatian plate is an alternating bending shape.The internal diameter of this lamp is 4.5mm, and it is not a low-pressure mercury discharge lamp, but comprises the neon discharge lamp of fluorescent material, and its luminous efficiency is starkly lower than the luminous efficiency that low-pressure mercury discharge lamp can reach.
Usually, blue, green, red is to produce the essential spectrum composition of chromatic image, the material that these compositions can activate by the europium that contains with divalence, and the fluorescent material of material that the terbium of usefulness trivalent activated and the material that activated with the europium of trivalent provides.Contain any at least fluorescent material in the said material group by lamp of the present invention is the most handy.
The invention still further relates to the illuminatian plate that a kind of illuminatian plate, particularly LCD are used.This illuminatian plate comprises the flat box at a band end, and one has the end of with a certain distance from and parallel the end of with and by the light-emitting area that a diffusing panel covers, and it is characterized in that low-pressure mercury discharge lamp of the present invention is emitted between the end and the diffusing panel.
Accompanying drawing illustrates the embodiment of low-pressure mercury discharge lamp of the present invention and illuminatian plate, wherein:
Fig. 1 is the front view and the fragmentary cross-sectional view thereof of low-pressure mercury discharge lamp;
Fig. 2 is the floor map of illuminatian plate; With
Fig. 3 is the sectional view of illuminatian plate shown in Figure 2 at III-III line place.
Low-pressure mercury discharge lamp shown in Figure 1 has a tubular glass lamp 1 with the sealing-in of vacuum seal method, and this glass lamp is parallel to the plane alternating bending and extends.Fluorescent tube 1 has 8 straight, substantially parallel arms 2, penetration type current feed 5,6, and its every lead-in wire all supports cold electrode 7,8 in the pipe respectively, and by two ends 3,4 places of sealing-in at fluorescent tube 1.The internal diameter of fluorescent tube 1 is 2.6mm, thickness of pipe wall 0.8mm, and length is 93cm, discharge channel length is 90cm, that is, be 348 times of fluorescent tube 1 internal diameter.The inner surface of fluorescent tube 1 is coated with fluorescence coating 9, and this fluorescence coating is the barium magnesium aluminate of sending out fluorescence blue that contains that useful divalent europium activated, the mixture of the yittrium oxide of the cerium-zirconium aluminic of the greening fluorescence that activated with the trivalent terbium and the rubescent fluorescence that activated with the trivalent europium.It is 4000K that the mixed proportion of these fluorescent materials is chosen to make lamp to have colour temperature during operation, lamp emission white light.Free distance between the arm of lamp is 7mm, that is, be 2.7 times of internal diameter of fluorescent tube 1.Owing to selected such free distance and the ratio between the internal diameter, (between 1-5) when this lamp is used for illuminatian plate, can obtain the uniform outer surface illumination of high brightness.Be filled with a spot of mercury and pressure in the fluorescent tube 1 and be 40 millibars neon, argon-mixed.About 70 lumens/watt when the luminous efficiency of lamp is 3.5W (lamp current 3mA) in power consumption are applicable to 6 inches displays.
Illuminatian plate described in Fig. 2 and Fig. 3 comprises the flat box-shaped casing 11 of being with the end 12 and the light-emitting area 13 of the diffusing panel 14 that extends in parallel and cover with the said end.The LCD 15 that is arranged on the diffusing panel 14 is shown in broken lines.The end 12 of shell 11, have reflector layer 16.The described this lamp 1 of Fig. 1 is emitted in the shell 11.The battery supply (not shown) of lamp 1 is arranged on 18 places, position in the shell 11.This power supply produces the operating voltage of 1200 volts (25KHz).This illuminatian plate is applicable to 6 inches display, and the efficient of duration of work is every watt 10 candle light.
Claims (4)
1. low-pressure mercury discharge lamp, comprise elongate tubular fluorescent tube with the vacuum sealing method sealing-in, this fluorescent tube and plane parallel and alternating bending are extended, the inner surface of tube is coated with fluorescent material, be filled with the filler that contains inert gas and mercury in the fluorescent tube, there is cold electrode at its discharge channel two ends, it is characterized in that, the length of discharge channel is 250 times of fluorescent tube internal diameter at least, and maximum is 1000 times of fluorescent tube internal diameter.
2. press the low-pressure mercury discharge lamp of claim 1, it is characterized in that, the discharge tube of alternating bending shape comprises many arms straight, that be parallel to each other basically, the fluorescent tube internal diameter is at least 2.0mm, be 3.5mm to the maximum, free distance between the arm equals the fluorescent tube internal diameter at least, is 5 times of fluorescent tube internal diameter to the maximum.
3. by claim 1 or 2 low-pressure mercury discharge lamp, it is characterized in that described fluorescence coating comprises the fluorescent material that activated by divalent europium at least, the fluorescent material that was activated by the trivalent terbium at least and the fluorescent material that was activated by the trivalent europium at least.
4. illuminatian plate that LCD is used, the flat box that comprises a band end has certain distance and parallel the end of with the light-emitting area that covers with diffusing panel with one the end of apart from, it is characterized in that, illuminatian plate is equipped with low-pressure mercury discharge lamp, this low-pressure mercury discharge lamp comprises the elongate tubular fluorescent tube with the vacuum sealing method sealing-in, this fluorescent tube and plane parallel and alternating bending are extended, the inner surface of tube is coated with fluorescent material, be filled with the filler that contains inert gas and mercury in the fluorescent tube, there is cold electrode at its discharge channel two ends, the length of discharge channel is 250 times of fluorescent tube internal diameter at least, and maximum is 1000 times of fluorescent tube internal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93106128A CN1051873C (en) | 1993-05-08 | 1993-05-08 | Low-pressure mercury discharge lamp and illumination panel provided with such a lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93106128A CN1051873C (en) | 1993-05-08 | 1993-05-08 | Low-pressure mercury discharge lamp and illumination panel provided with such a lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1095186A CN1095186A (en) | 1994-11-16 |
| CN1051873C true CN1051873C (en) | 2000-04-26 |
Family
ID=4986076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93106128A Expired - Lifetime CN1051873C (en) | 1993-05-08 | 1993-05-08 | Low-pressure mercury discharge lamp and illumination panel provided with such a lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1051873C (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1514281A (en) * | 1975-10-24 | 1978-06-14 | Claudgen Ltd | Low pressure mercury vapour fluorescent electric discharge lamps |
-
1993
- 1993-05-08 CN CN93106128A patent/CN1051873C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1514281A (en) * | 1975-10-24 | 1978-06-14 | Claudgen Ltd | Low pressure mercury vapour fluorescent electric discharge lamps |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1095186A (en) | 1994-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: N.V. Philips' Gloeipenfabrieken Applicant before: Philips Electronics N. V. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: N.V. PHILIPS OPTICAL LAMP LTD., CO. TO: N.V. PHILIPS OPTICAL LAMP MANUFACTURING COMPANY |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130508 Granted publication date: 20000426 |