EP0389717A2 - Ultraviolettstrahlenschutzrohr - Google Patents

Ultraviolettstrahlenschutzrohr Download PDF

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Publication number
EP0389717A2
EP0389717A2 EP89312420A EP89312420A EP0389717A2 EP 0389717 A2 EP0389717 A2 EP 0389717A2 EP 89312420 A EP89312420 A EP 89312420A EP 89312420 A EP89312420 A EP 89312420A EP 0389717 A2 EP0389717 A2 EP 0389717A2
Authority
EP
European Patent Office
Prior art keywords
ultraviolet ray
shielding
tube
binder
lamps
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89312420A
Other languages
English (en)
French (fr)
Other versions
EP0389717A3 (de
EP0389717B1 (de
Inventor
Kanehiro Saito
Mitsumasa Saito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Osaka Cement Co Ltd
Original Assignee
Sumitomo Cement Co Ltd
Sumitomo Osaka Cement Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Cement Co Ltd, Sumitomo Osaka Cement Co Ltd filed Critical Sumitomo Cement Co Ltd
Publication of EP0389717A2 publication Critical patent/EP0389717A2/de
Publication of EP0389717A3 publication Critical patent/EP0389717A3/de
Application granted granted Critical
Publication of EP0389717B1 publication Critical patent/EP0389717B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/40—Devices for influencing the colour or wavelength of the light by light filters; by coloured coatings in or on the envelope

Definitions

  • the present invention relates to an ultra-­violet ray-shielding agent and tube. More particularly, the present invention relates to an ultraviolet ray-­shielding agent and tube for a discharge lamp.
  • luminescent lamps for example, mercury lamps, metal halide vapor lamps, sodium lamps, xenon lamps and halogen lamps, have an excellent luminance and brightness, a high illumination efficiency, and a long durability, and thus are useful for illuminating buildings such as shops, and as fish-luring lamps.
  • Luminescent lamps irradiate strong ultraviolet rays in addition to visible rays, and due to recent increases in the luminance or brightness of the luminescent lamps, for example, halogen lamps, the ultraviolet ray-radiation therefrom can no longer be ignored. Namely, when these lamps are used to illuminate, for example, department stores, the ultraviolet rays cause a discoloration and deterioration of the goods, and when used as fish-luring lights, the ultraviolet rays burn the skin of the users and may cause skin cancer or a deterioration of the eyesight of the users. Therefore, it is necessary that some form of shielding from the ultraviolet rays emitted by luminescent lamp be provided.
  • titanium dioxide or cerium oxide is utilized as the ultraviolet ray-­shielding material, but these compounds are disadvan­tageous in that they have the following properties:
  • ultraviolet ray-shielding coating materials must satisfy all of the following require­ments:
  • An object of the present invention is to provide an ultraviolet ray-shielding agent and tube for luminescent lamps, which have a high transparency to and a low scattering of visible rays, and provide an effective shield against ultraviolet rays.
  • the above-mentioned object can be attained by the ultraviolet ray-shielding agent and tube of the present invention for luminescent lamps.
  • the ultraviolet ray-shielding agent of the present invention comprises; a binder capable of transmitting visible rays therethrough, and extremely fine zinc oxide particles having an average size of 0.1 ⁇ m or less and dispersed in the binder in a mixing ratio of the zinc oxide particles to the binder of 1:10 to 10:1.
  • the ultraviolet ray-shielding tube of the present invention for visible ray-irradiation luminescent lamps comprises a transparent substrate tube for sealing a light emission source therein, and at least one ultraviolet ray-shielding coating formed on at least one surface of the substrate tube, comprising a binder capable of transmitting visible rays therethrough and extremely fine zinc oxide particles having an average size of 0.1 ⁇ m or less and dispersed in the binder in a mixing ratio of the zinc oxide particles to the binder of 1:10 to 10:1; this coating having a thickness of 0.5 to 50 ⁇ m.
  • the ultraviolet ray-shielding agent and tube of the present invention provide an effective shield against ultraviolet rays without reducing the luminance or brightness and the color-rendering property of the luminescent lamps.
  • the ultraviolet ray-shielding agent of the present invention usable for luminescent lamps comprises a binder capable of transmitting visible rays therethrough and extremely fine zinc oxide (ZnO) particles having an average size of 0.1 ⁇ m or less, and dispersed in the binder.
  • the mixing ratio of the zinc oxide particles to the binder is from 1:10 to 10:1.
  • the upper end wave length in the ultraviolet ray-absorption of zinc oxide is about 380 nm; which is very close to 400 nm, an upper end of the ultraviolet ray band.
  • the conventional zinc oxide particle having a size of more than 0.1 ⁇ m exhibit high visible ray-scattering and shielding properties and thus appear white, and therefore, the conventional zinc oxide particles are used as a white pigment. But when used as a coating material for a luminescent lamp, and thus the conventional zinc oxide particles reduce the luminance and color-rendering property of the luminescent lamp, and thus the conventional zinc oxide particles are useless as a visible ray-transmitting coating material.
  • the extremely fine zinc oxide particles of the present invention having a size of 0.1 ⁇ m or less have a very sharp end in the ultraviolet ray absorption located at a wave length close to 400 nm and can transmit and scatter the visible rays, and therefore, are very suitable as a coating material capable of transmitting and scattering the visible rays and selectively shielding the ultraviolet rays.
  • the extremely fine zinc oxide particles having an average size of 0.1 ⁇ m or less are evenly dispersed, preferably in the binder, in a mixing ratio of the zinc oxide particle to the binder, of 1:10 to 10:1, preferably 2:1 to 1:2.
  • the mixing ratio When the mixing ratio is lower than 1/10, the resultant ultraviolet ray-shielding agent exhibits an unsatisfactory ultraviolet ray-shielding effect. Also, a mixing ratio of higher than 10/1 causes the resultant ultraviolet ray-shielding agent layer to exhibit an unsatisfactory mechanical strength.
  • the binder usable for the present invention must be capable of forming a solid film having a high transparency for visible rays, a satisfactory heat resistance and durability, provide a satisfactory dispersion of the extremely fine zinc dioxide particles therein, and firmly adhere to a substrate tube or bulb for containing an emission source.
  • the binder should have a thermal expansion coefficient similar to that of the substrate tube.
  • the binder usable for the present invention preferably comprises at least one member selected from the group-consisting of colloidal silica, polysiloxanes, polyborosiloxanes, polycarbosilanes, and poly­phosphazenes.
  • the colloidal silica is preferably selected from aqueous silica sol and a hydrolysis product of a silicon alkoxide.
  • the polysiloxane can be selected from conventional polysiloxane resins.
  • the binder may contain specific metal ions or boron to adjust the thermal expansion coefficient of the resultant ultraviolet ray-shielding coating layer to the same level as that of the substrate tube of the luminescent lamp.
  • the ultraviolet ray-shielding tube of the present invention for visible ray-irradiation luminescent lamps comprises a transparent substrate tube for sealing a light emission source therein, and at least one ultraviolet ray-shielding coating layer formed on at least one surface of the substrate tube.
  • the coating layer comprises the ultraviolet ray-shielding agent as mentioned above, and has a thickness of 0.5 to 50 ⁇ m, preferably, 3 to 30 ⁇ m.
  • the resultant coating layer When the thickness is less than 0.5 ⁇ m, the resultant coating layer exhibits an unsatisfactory ultraviolet ray-shielding effect. Also, when the thickness is more than 50 ⁇ m, the resultant coating layer reduces the luminance and color-rendering property of the tube.
  • the transparent substrate tube is usually formed of a glass, for example, a quartz glass.
  • the substrate tube to be coated with the ultraviolet ray-shielding agent may be an outer bulb of a luminescent lamp or an inner tube for sealing a light emission source of a luminescent lamp.
  • the luminescent lamp is selected from the group consisting of mercury vapor lamps, metal halide vapor lamps, sodium lamps, xenon lamps, and halogen lamps.
  • the ultraviolet ray shielding coating layer is formed, in a xenon lamp or halogen lamp, on either one or both of the outside and inside surfaces of the outer bulb, and in a mercury vapor lamp, metal halide vapor lamp or sodium lamp, on either one or both of the outside and inside surfaces of an outer bulb or on the outside surface of an inner bulb.
  • a halogen lamp has a outer bulb 1 made from a quartz glass and a light emission source 2 (tungsten filaments), and an ultraviolet ray-shielding coating 3 is formed on an outside surface of the outer bulb 1; i.e., the coating layer 3 is exposed to the ambient air atmosphere.
  • a light emission source 2 tungsten filaments
  • a mercury vapor lamp has an outer bulb 1, main electrodes 4, supplementary electrodes 4, a light-emission inner tube 6, conductive supporting rods 7, an initiating resistance element 9, and an ultraviolet ray-shielding coating 3 is formed on the outside surface of the outer tube 1; i.e., the coating layer 3 is exposed to the ambient air atmosphere.
  • an ultraviolet ray-shielding coating 3 is formed on the outside surface of the light-emission inner tube 6. The coating 3 is exposed to the gas atmosphere contained in the outer bulb 1.
  • the ultraviolet ray-shielding coating can be formed by applying a coating liquid containing the ultraviolet ray-shielding agent of the present invention on a surface of an outer or inner bulb of the luminescent lamp, by a dipping method, spraying method, flow coating method, or brushing method, and solidifying the coated liquid by drying.
  • a mixture of 100 parts by weight of tetraethoxy silane, 300 parts by weight of isopropyl alcohol, and 35 parts by weight of a 0.1N hydrochloric acid aqueous solution was stirred at a temperature of 60° for 2 hours to prepare an aqueous silica colloid dispersion.
  • the resultant aqueous silica colloid dispersion was mixed with 30 parts by weight of zinc oxide particles having a size of from 0.005 ⁇ m to 0.02 ⁇ m and an average size of 0.01 ⁇ m, and the mixture was dispersed in a sand mill for 2 hours to provide a coating liquid.
  • This coating liquid contained extremely fine particles of zinc oxide and silica, 99% by weight of which have a size of 0.1 ⁇ m or less.
  • a quartz outer bulb for a 100 W halogen luminescent lamp was immersed in the coating liquid and taken up at a constant speed to form a liquid coating having an even thickness on the outside surface of the bulb and the liquid coating was dried at a temperature of 150°C for 15 minutes, to provide a transparent coating having a thickness of 1.5 ⁇ m.
  • the resultant conventional halogen luminescent lamp had the relationship between a wave length and a relative intensity of emission of irradiated rays through the non-coated outer bulb, as shown in Fig. 2.
  • the rays irradiated through the non-coated outer bulb contain a specific intensity of ultraviolet rays having a wave length of 400 nm or less.
  • the conventional lamp exhibited an intensity of illumination and a quantity of ultraviolet ray irradiation as shown in Table 1.
  • Figure 3 shows a relationship between a wave length and a relative intensity of emission of rays irradiated from the halogen luminescent lamp through the outer bulb coated with the ultraviolet ray-shielding agent.
  • the coating formed on the outer bulb surface shielded only the ultraviolet rays, without shielding the visible rays.
  • Example 2 The same coating liquid as mentioned in Example 1 was applied to an outside surface of a quartz outer bulb of a 1000 W mercury vapor luminescent lamp by a flow-­coating method and the resultant liquid coating was dried at a temperature of 150°C for 15 minutes.
  • the non-coated outer bulb exhibited a spectral transmittance performance as indicated in Fig. 5.
  • Figure 5 shows that the non-coated outer bulb allowed the transmission of ultraviolet rays having a wave length of about 400 nm or less therethrough.
  • the conventional mercury vapor luminescent lamp having the non-coated outer bulb exhibited the intensity of illumination and quantity of ultraviolet ray irradiation as shown in Table 1.
  • the resultant coated outer bulb did not allow a transmission of the ultraviolet rays therethrough, as indicated in Fig. 6. Also, from a comparison of Fig. 6 with Fig. 5, it is clear that the coated outer bulb did not shield the visible rays.
  • the mercury vapor luminescent lamp having the coated outer bulb exhibited the intensities of illumination and quantities of ultraviolet ray irradiation at the initial stage of the lighting operation, and at 1000 hours after the start of the lighting operation, as indicated in Table 1.
  • a light-emission inner bulb made from a quartz glass was immersed in the same coating liquid as described in Example 1 and taken up at a constant speed and the resultant coating formed on the outer surface of the inner bulb was dried at a temperature of 500°C for 30 minutes. The above-mentioned procedures were repeated twice, and the resultant transparent coating had a thickness of 2.0 ⁇ m.
  • the coated inner bulb was inserted into an outer bulb made from a brone-silicic acid glass to provide a 1000 W mercury vapor luminescent lamp as shown in Figs. 7A and 7B.
  • the resultant mercury vapor luminescent lamp exhibited a spectral transmittance performance as indicated in Fig. 8.
  • Figure 8 clearly shows that the ultraviolet rays having a wave length of about 400 nm or less are shielded by the coated inner bulb.
  • the mercury vapor luminescent lamp having the coated inner bulb exhibited the intensities of illumination and quantities of ultraviolet ray irradiation at the initial stage of the lighting operation, and at 1000 hours after the start of the lighting operation, as indicated in Table 1.
  • Example 2 The same procedures as those described in Example 1 were carried out except that the titanium oxide particles in the coating liquid had a size of from 0.05 to 0.1 ⁇ m and an average size of 0.08 ⁇ m.
  • the properties of the comparative lamp having the non-coated bulb and another comparative lamp having the coated bulb are shown in Table 1.
  • Table 1 Example No. Example 1 2 3 Comparative Example 1 Item Type of bulb Property Non-coated Intensity of illumination (lx) 138,000 7,880 7,800 7,800 Quantity of ultraviolet ray irradiation (mW/m2) 1.00 1.02 1.02 1.02 Coated Intensity of illumination (lx) Initial stage 14,490 8,060 8,260 6,700 1000 hr after 14,000 7,900 8,100 6,430 Quantity of ultraviolet ray irradiation (mW/m2) Initial stage 0 0 0 0 1000 hr after 0 0 0 0 Note: The intensity of illumination and quantity of ultraviolet ray irradiation were measured at a point 10 cm from the center of the luminescent lamp in Example 1, and 60 cm from the center of the luminescent lamp in Examples 2 and 3 and Comparative Example 1.
  • Table 1 clearly shows that, in each of Examples 1 to 3, the resultant ultraviolet ray shielding layer of the present invention did not reduce the intensity of illumination of the luminescent lamp but caused an increase thereof, and had a high durability over a long period of time.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Paints Or Removers (AREA)
  • Luminescent Compositions (AREA)
EP89312420A 1989-03-28 1989-11-29 Ultraviolettstrahlenschutzrohr Expired - Lifetime EP0389717B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP73874/89 1989-03-28
JP7387489A JPH02253554A (ja) 1989-03-28 1989-03-28 紫外線遮蔽ランプ及びその製法

Publications (3)

Publication Number Publication Date
EP0389717A2 true EP0389717A2 (de) 1990-10-03
EP0389717A3 EP0389717A3 (de) 1991-04-24
EP0389717B1 EP0389717B1 (de) 1996-09-11

Family

ID=13530781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89312420A Expired - Lifetime EP0389717B1 (de) 1989-03-28 1989-11-29 Ultraviolettstrahlenschutzrohr

Country Status (4)

Country Link
EP (1) EP0389717B1 (de)
JP (1) JPH02253554A (de)
DE (1) DE68927166T2 (de)
HK (1) HK1000298A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4137819A1 (de) * 1991-11-16 1993-05-19 Wegmann & Co Gmbh Vorrichtung zum identifizieren von munition
NL9301024A (nl) * 1992-07-08 1994-02-01 Koito Mfg Co Ltd Electrische ontladingslampinrichting als lichtbron voor een autoverlichtingsinrichting.
EP0662704A1 (de) * 1993-12-28 1995-07-12 Toshiba Lighting & Technology Corporation Lampe und Beleuchtungseinrichtung mit Verwendung derartiger Lampe
US5464462A (en) * 1992-09-15 1995-11-07 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Method of making a quartz glass tube having a reduced ultraviolet radiation transmissivity
DE4432770A1 (de) * 1994-09-14 1996-03-28 Brueck Alexandra UV-Röhre
EP0758141A3 (de) * 1995-08-05 1997-03-12 Central Research Laboratories Limited Abschirmung gegen Radiofrequenz-Interferenz
WO1999023687A1 (en) * 1997-10-31 1999-05-14 Nanogram Corporation Articles or compositions comprising nanoscale particles; methods of utilizing or producing such particles
CN110349833A (zh) * 2019-06-02 2019-10-18 威海鑫润德贸易有限公司 一种荧光灯管内涂层及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4177720B2 (ja) * 2003-06-25 2008-11-05 ハリソン東芝ライティング株式会社 閃光放電ランプ、閃光放電ランプ点灯装置および光照射装置
JP2006216360A (ja) * 2005-02-03 2006-08-17 Matsushita Electric Ind Co Ltd 閃光放電管およびストロボ装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774903A (en) * 1951-01-17 1956-12-18 Sylvania Electric Prod Non-actinic fluorescent lamp
GB931381A (en) * 1960-09-13 1963-07-17 Philips Electrical Ind Ltd Improvements in or relating to ultra-violet radiators and envelopes therefor
DE1915510A1 (de) * 1967-07-31 1970-09-17 Westinghouse Electric Corp Elektrische Lampen mit einem Roehrenkolben aus fotoresistentem Natronkalk-Silikatglas
US4006378A (en) * 1975-10-01 1977-02-01 General Electric Company Optical coating with selectable transmittance characteristics and method of making the same
NL7805804A (nl) * 1978-05-29 1979-12-03 Philips Nv Inrichting voor het aanleggen van een stuurspanning over een pieezo-elektrisch positioneringselement.
US4792716A (en) * 1981-10-29 1988-12-20 Duro-Test Corporation Energy-efficient electric discharge lamp with reflective coating
JPS62131463A (ja) * 1985-11-30 1987-06-13 Iwasaki Electric Co Ltd 高圧放電灯
MY100306A (en) * 1985-12-18 1990-08-11 Kao Corp Anti-suntan cosmetic composition
JP2856754B2 (ja) * 1989-02-17 1999-02-10 株式会社東芝 紫外線抑制発光源、紫外線抑制発光源用塗布剤、及び紫外線抑制発光源の製造方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4137819A1 (de) * 1991-11-16 1993-05-19 Wegmann & Co Gmbh Vorrichtung zum identifizieren von munition
NL9301024A (nl) * 1992-07-08 1994-02-01 Koito Mfg Co Ltd Electrische ontladingslampinrichting als lichtbron voor een autoverlichtingsinrichting.
US5464462A (en) * 1992-09-15 1995-11-07 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Method of making a quartz glass tube having a reduced ultraviolet radiation transmissivity
US5572091A (en) * 1992-09-15 1996-11-05 Patent-Treuhand-Gesellschaft f ur elektrische Gl uhlampen mbH Quartz glass with reduced ultraviolet radiation transmissivity, and electrical discharge lamp using such glass
EP0662704A1 (de) * 1993-12-28 1995-07-12 Toshiba Lighting & Technology Corporation Lampe und Beleuchtungseinrichtung mit Verwendung derartiger Lampe
DE4432770A1 (de) * 1994-09-14 1996-03-28 Brueck Alexandra UV-Röhre
DE4432770C2 (de) * 1994-09-14 1998-11-19 Brueck Alexandra UV-Röhre und ihre Verwendung
EP0758141A3 (de) * 1995-08-05 1997-03-12 Central Research Laboratories Limited Abschirmung gegen Radiofrequenz-Interferenz
WO1999023687A1 (en) * 1997-10-31 1999-05-14 Nanogram Corporation Articles or compositions comprising nanoscale particles; methods of utilizing or producing such particles
CN110349833A (zh) * 2019-06-02 2019-10-18 威海鑫润德贸易有限公司 一种荧光灯管内涂层及其制备方法

Also Published As

Publication number Publication date
DE68927166D1 (de) 1996-10-17
EP0389717A3 (de) 1991-04-24
JPH02253554A (ja) 1990-10-12
HK1000298A1 (en) 1998-02-20
DE68927166T2 (de) 1997-02-20
EP0389717B1 (de) 1996-09-11

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