US2238784A - Electric discharge device - Google Patents
Electric discharge device Download PDFInfo
- Publication number
- US2238784A US2238784A US310038A US31003839A US2238784A US 2238784 A US2238784 A US 2238784A US 310038 A US310038 A US 310038A US 31003839 A US31003839 A US 31003839A US 2238784 A US2238784 A US 2238784A
- Authority
- US
- United States
- Prior art keywords
- electric discharge
- fluorescent
- layer
- glaze
- glass
- 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.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
Definitions
- Our invention relates in general to electric discharge devices, and more particularly to electric discharge devices of the type in which a luminescent material is employed to convert the non-visible radiations of the discharge into visible radiations.
- One object of our invention is to provide a protective coating for the fluorescent screens or coatings of electric discharge devices which is porous or.gas-permeable and which is transvention into effect, the glass tube is first ren-- dered fluorescent by coating the inside surface thereof with a layer of fluorescent powder.
- This layer may be caused to adhere to the glass in any suitable way by a suitable binder such as an enamel, boric acid, phosphoric acid, silicon ester medium, or ⁇ it may adhere to the glass merely by nature of its own flneness' and keyingaction.
- a suitable binder such as an enamel, boric acid, phosphoric acid, silicon ester medium, or ⁇ it may adhere to the glass merely by nature of its own flneness' and keyingaction.
- We prefer to app y the fluorescent powder by the method described in co-pending application Serial No. 226,566, T. W. Frech, filed August 24, 1938.
- the fluorescent powder with or with out a binder, is applied as a paint-like suspension in a suitable medium, an excess of which is applied to the tube, wetting the inner surface thereof, and then drained out with the tube upright.
- the fluorescent coating is then baked on and at least part of the suspension medium evaporated or otherwise removed.
- one or more layers of a. similar suspension of the protective material is applied in the same manner and the tube then baked at a high temperature to remove all remaining organic components of the suspension medium and cause the coating particles to knit or frit or iuse together, thus forming a porous layer.
- this layer may be fused together forming a glaze with gas permeable pores at close intervals. This is done, for example, by including a small propor-v tion of particles of different melting point and different co-eflicient of expansion from the main glaze so that numerous small cracks will interlace the glaze when it cools down;
- the glaze is preferably made by grinding down one or more ultra-vlolet-transmitting mercuryresistant glasses or transparent. media of the many known types and not by forming the glass in situ from its components as the former method involves less heating or the fluorescent layer.
- An electric discharge device comprising a lglass envelope for the arc discharge, a layer of luminescent materia1 on said glassenvelope, and a protective coating of an ultra-violet tran'sm'it-;
- An electric discharge device comprising a glass envelope for the arc discharge, a layer of luminescent material on said glass envelope, and
- An electric discharge device comprising a glass envelope for the arc discharge, a layer of luminescent material on said glass envelope, and a protective coating of an ultra-violet transmitting glaze on said luminescent 7 material, said glaze being interlaced with numerous small cracks to thereby render the same gas-permeable.
Description
Patented Apr. 15, 1941 suac'rmc msonancn DEVICE William J. Scott, James T. Anderson, and Robert S. Wells, Rugby, England, assignors to General Electric Company, a corporation of New York No Drawing. Application December 19, 1939, Se-
rial No. 310,038. In Great Britain January 16,
l 3 Claims.
Our invention relates in general to electric discharge devices, and more particularly to electric discharge devices of the type in which a luminescent material is employed to convert the non-visible radiations of the discharge into visible radiations.
It is well known that when fluorescent powders are used inside electric discharge lamps (especially those operating with a, low-pressure mercury discharge), these powders tend to lose their efliciency. To counteract this loss in efliciency, it has been proposed to shield the fluorescent material'fromthe discharge by means of a layer or admixture of a substance capable of transmitting the exciting ultra-violet radiation from the discharge but preventing ionized mercury from impinging on the fluorescent material. Thus, it has been. proposed to coat the inside surface of the glass lamp envelope with a layer of the fluorescent material, and to protectsuchfluorescent material by means of a binder, such as silicon ester, or by blowing onto the, fluorescent glass. It has also been proposed to mix the fluorescent powder with a protecting medium when applying it to the glass envelope.
coating a thin non-porous layer of a phosphate Certain fluorescent powders are adversely affected by the gas and water vapor evolved from the underlying glass support (envelope); particularly during the exhausting of the lamp. Hence it is desirable to have the protective layer adequately porous or permeable to gas, at least during the initial stages of outgasslng when the possibility of such attackis greatest. It is then in many cases permissible to hermetically seal this porous protective layer to thereby prevent subsequent access of mercury vapor to the powder.
One object of our invention is to provide a protective coating for the fluorescent screens or coatings of electric discharge devices which is porous or.gas-permeable and which is transvention into effect, the glass tube is first ren-- dered fluorescent by coating the inside surface thereof with a layer of fluorescent powder. This layer may be caused to adhere to the glass in any suitable way by a suitable binder such as an enamel, boric acid, phosphoric acid, silicon ester medium, or \it may adhere to the glass merely by nature of its own flneness' and keyingaction. We prefer to app y the fluorescent powder by the method described in co-pending application Serial No. 226,566, T. W. Frech, filed August 24, 1938. The fluorescent powder, with or with out a binder, is applied as a paint-like suspension in a suitable medium, an excess of which is applied to the tube, wetting the inner surface thereof, and then drained out with the tube upright. The fluorescent coating is then baked on and at least part of the suspension medium evaporated or otherwise removed.
' After the baking of' thefluorescent material onto the lamp envelope, one or more layers of a. similar suspension of the protective material is applied in the same manner and the tube then baked at a high temperature to remove all remaining organic components of the suspension medium and cause the coating particles to knit or frit or iuse together, thus forming a porous layer.- It is to be understood. that this layer may be fused together forming a glaze with gas permeable pores at close intervals. This is done, for example, by including a small propor-v tion of particles of different melting point and different co-eflicient of expansion from the main glaze so that numerous small cracks will interlace the glaze when it cools down;
The glaze is preferably made by grinding down one or more ultra-vlolet-transmitting mercuryresistant glasses or transparent. media of the many known types and not by forming the glass in situ from its components as the former method involves less heating or the fluorescent layer.
What we claim as new and desire to secure by Letters Patent of the United States is:
1. An electric discharge device comprising a lglass envelope for the arc discharge, a layer of luminescent materia1 on said glassenvelope, and a protective coating of an ultra-violet tran'sm'it-;
ting gas-permeable glaze on said luminescent material.
2. An electric discharge device comprising a glass envelope for the arc discharge, a layer of luminescent material on said glass envelope, and
' a protective coating of an ultra-violet transmitting glaze on said luminescent material, said glaze consisting of at least two different glasses having different expansion co-eflicients to thereby render'the glaze gas-permeable.
3. An electric discharge device comprising a glass envelope for the arc discharge, a layer of luminescent material on said glass envelope, and a protective coating of an ultra-violet transmitting glaze on said luminescent 7 material, said glaze being interlaced with numerous small cracks to thereby render the same gas-permeable.
WILLIAM J. SCOTT. JAMES T. ANDERSON. R. S. IWELLB.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2238784X | 1939-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2238784A true US2238784A (en) | 1941-04-15 |
Family
ID=10901974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US310038A Expired - Lifetime US2238784A (en) | 1939-01-16 | 1939-12-19 | Electric discharge device |
Country Status (1)
Country | Link |
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US (1) | US2238784A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2418202A (en) * | 1941-07-07 | 1947-04-01 | Gen Electric | Fluorescent lamp and method of manufacture |
US2421975A (en) * | 1943-03-19 | 1947-06-10 | Roscoe D Williams | Manufacture of fluorescent tubing |
US2689190A (en) * | 1951-12-05 | 1954-09-14 | Westinghouse Electric Corp | Fluorescent screen and method for forming same |
US2689188A (en) * | 1950-12-12 | 1954-09-14 | Westinghouse Electric Corp | Fluorescent screen of a phosphor in glass and method for producing same |
US2873205A (en) * | 1955-03-22 | 1959-02-10 | Philips Corp | Process for forming luminescent screens |
US3886396A (en) * | 1971-10-10 | 1975-05-27 | Gen Electric | Fluorescent lamp with protective coating |
US3947719A (en) * | 1974-03-29 | 1976-03-30 | John Ott Laboratories, Inc. | Filtered fluorescent lamp |
US4048533A (en) * | 1971-10-12 | 1977-09-13 | Owens-Illinois, Inc. | Phosphor overcoat |
US4670688A (en) * | 1981-12-24 | 1987-06-02 | Gte Products Corp. | Fluorescent lamp with improved lumen output |
US4710674A (en) * | 1984-05-07 | 1987-12-01 | Gte Laboratories Incorporated | Phosphor particle, fluorescent lamp, and manufacturing method |
US4731560A (en) * | 1970-08-06 | 1988-03-15 | Owens-Illinois Television Products, Inc. | Multiple gaseous discharge display/memory panel having improved operating life |
US4794308A (en) * | 1970-08-06 | 1988-12-27 | Owens-Illinois Television Products Inc. | Multiple gaseous discharge display/memory panel having improved operating life |
US4797594A (en) * | 1985-04-03 | 1989-01-10 | Gte Laboratories Incorporated | Reprographic aperture lamps having improved maintenance |
US4825124A (en) * | 1984-05-07 | 1989-04-25 | Gte Laboratories Incorporated | Phosphor particle, fluorescent lamp, and manufacturing method |
-
1939
- 1939-12-19 US US310038A patent/US2238784A/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2418202A (en) * | 1941-07-07 | 1947-04-01 | Gen Electric | Fluorescent lamp and method of manufacture |
US2421975A (en) * | 1943-03-19 | 1947-06-10 | Roscoe D Williams | Manufacture of fluorescent tubing |
US2689188A (en) * | 1950-12-12 | 1954-09-14 | Westinghouse Electric Corp | Fluorescent screen of a phosphor in glass and method for producing same |
US2689190A (en) * | 1951-12-05 | 1954-09-14 | Westinghouse Electric Corp | Fluorescent screen and method for forming same |
US2873205A (en) * | 1955-03-22 | 1959-02-10 | Philips Corp | Process for forming luminescent screens |
US4731560A (en) * | 1970-08-06 | 1988-03-15 | Owens-Illinois Television Products, Inc. | Multiple gaseous discharge display/memory panel having improved operating life |
US4794308A (en) * | 1970-08-06 | 1988-12-27 | Owens-Illinois Television Products Inc. | Multiple gaseous discharge display/memory panel having improved operating life |
US3886396A (en) * | 1971-10-10 | 1975-05-27 | Gen Electric | Fluorescent lamp with protective coating |
US4048533A (en) * | 1971-10-12 | 1977-09-13 | Owens-Illinois, Inc. | Phosphor overcoat |
US3947719A (en) * | 1974-03-29 | 1976-03-30 | John Ott Laboratories, Inc. | Filtered fluorescent lamp |
US4670688A (en) * | 1981-12-24 | 1987-06-02 | Gte Products Corp. | Fluorescent lamp with improved lumen output |
US4710674A (en) * | 1984-05-07 | 1987-12-01 | Gte Laboratories Incorporated | Phosphor particle, fluorescent lamp, and manufacturing method |
US4825124A (en) * | 1984-05-07 | 1989-04-25 | Gte Laboratories Incorporated | Phosphor particle, fluorescent lamp, and manufacturing method |
US4797594A (en) * | 1985-04-03 | 1989-01-10 | Gte Laboratories Incorporated | Reprographic aperture lamps having improved maintenance |
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