EP0125356A1 - Arrangement de filtre pour tube à rayon cathodique - Google Patents
Arrangement de filtre pour tube à rayon cathodique Download PDFInfo
- Publication number
- EP0125356A1 EP0125356A1 EP83302667A EP83302667A EP0125356A1 EP 0125356 A1 EP0125356 A1 EP 0125356A1 EP 83302667 A EP83302667 A EP 83302667A EP 83302667 A EP83302667 A EP 83302667A EP 0125356 A1 EP0125356 A1 EP 0125356A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glass
- adhesive
- filter glass
- filter
- laminate
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
- H01J29/898—Spectral filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/863—Vessels or containers characterised by the material thereof
Definitions
- CTR cathode ray tube
- All visual display devices using a cathode ray tube, or CRT including televisions, TV games and monitors for business machines, generate ultraviolet rays which are harmful to human eyes.
- This invention provides a new filter glass to be placed in front of a CRT screen for filtering out the ultraviolet rays generated by the visual display device without at the same time changing the shape and color of the picture.
- a conventionally known filter glass for CRTs (shown in Fig. 1) comprises a laminate of two transparent planar sheet glass 10 having a layer of heat-reflective, translucent metallic oxide formed therebetween.
- Such a filter glass for CRTs when placed in front of a CRT screen 11, filters out infrared rays and glare from the picture, but does not filter out ultraviolet rays.
- the planar sheet glass construction tends to distort the peripheral part of the picture.
- the glass surfce also tends to reflect objects in the viewing room which interfere with the viewing of the picture.
- this invention offers a new filter glass for CRTs, capable of filtering out harmful ultraviolet rays without distorting the displayed picture and without reflection.
- the filter glass of this invention is composed of a laminate of two transparent, arcuate glass sheets having an ultraviolet ray absorbent disposed therebetween, the arcuate glass sheets having a curvature conforming to the curvature of the face of the CRT screen.
- the surface of the laminate facing the viewer is treated to provide a matted surface that does not reflect.
- This invention relates to a filter glass to be placed in front of a visual display device, or CRT, having an arcuate screen surface.
- a first embodiment of the filter glass of this invention compirses a first glass sheet 1, second glass sheet 2, both of which are transparent, arcuate, sheet glass having a curvature conforming to the curvature of the CRT screen for which the filter glass is to be used.
- the glass sheets are bonded by an adhesive layer 3 to form a laminate, adhesive layer 3 comprising an adhesive compound and an ultraviolet ray absorbent.
- first glass sheet 1 and second glass sheet 2 has a thickness of 2 to 3 mm. They are transparent, rectangular sheet glass which have been hot-pressed into an arcuate shape. The curvature of the laminate conforms to the curvature of the CRT screen so that when placed 1-5 mm in front of the CRT, a uniform gap G is maintained between the screen surface of the CRT and the concaved, inner surface 1S of the filter glass, as shown in Fig. 4.
- the convex outer surface 2S of the laminate is treated to provide a matted surface by such process as dipping in hydrofluoric acid, sand blasting, or by depositing crystals of silicon oxide over the glass surface so as to form a surface having irregularly formed projections or depressions within the range of 3 to 6 um from the surface, as shown in Fig. 3.
- the adhesive layer 3 is composed of a mixture of an adhesive compound and an ultraviolet ray absorbent.
- the adhesive compound can be polyvinylbutyral,one part or two part type epoxy resin based adhesive.
- a particular suitable adhesive is two part type epoxy resin based adhesive such as Shell Chemical's Epikote 828.
- Ultraviolet rays have a wavelength of less than 4000 A.
- the ultraviolet ray absorbents useful is this invention should have the capability of absorbing light rays having wavelengths within the range of 3000 to 4000 A, o particularly at 3530 A.
- Suitable ultraviolet ray absorbents include 2(2'-hydroxy-3' 5' di-tertbutylphenyl) benzotriazole (hydroxyphenyl benzoltriazole), 2-hydroxy-4-methoxybenzophenone, ethyl-2-cyano-3-phenylcinnamate and phenyl salicylate, with hydroxyphenyl benzotriazole and dihydroxybenzophenone being prefered.
- the mixture comprises about 98.0 to 99.5 parts by weight of the adhesive and about 0.5-2.0 parts by weight of the ultraviolet ray absorbent.
- a coloring agent may be included therein.
- the coloring agent may be selected from Ciba-Geigy Microlity-T Colours.
- the mixture is evenly applied to the surface of either first glass sheet 1 or second glass sheet 2 to bond them together. The best result is obtained when adhesive layer 3 has a thickness of 0.35 to 0.40 mm, preferably 0.38 mm.
- the filter glass may be colored by selecting a colored glass or a colored adhesive. Either light brown or light gray is preferable. When a colored glass is used, a clear adhesive compound is used. When a clear glass is used, a colored adhesive compound is used accordingly. Of course, if a clear filter glass is desired, clear glass and clear adhesive have to be used.
- first glass sheet 1 and second glass sheet 2 are prepared in the same way as the first embodiment.
- a layer of 2000 A - 3000 A thick ultraviolet ray abosrbent film 31 is formed on the surface on the concave side of second glass sheet 2.
- the ultraviolet ray absorbent film 31 is formed by spraying a solution comprising a solvent and an ultraviolet ray absorbent selected from the group of the compounds as previously described with respect to the first embodiment.
- the solvent may be toluene, benzene, acetone or ethanol and the solution may be a saturated solution of the selected compound.
- a layer of approximately 0.38 mm thick adhesive compound 32 is despoited on top of the layer of ultraviolet ray absorbent film to bond second glass sheet 2 onto the convex side of first glass sheet 1 to form a laminate.
- the convex side 2S of second glass sheet 2 is matted as in the case of the first embodiment.
- the concave surface IS of first glass sheet 1 may also be matted in the same way as the convex surface 2S of second glass sheet 2.
- a laminate of two arcuate glass sheets was made according to the first embodiment as described above, without either glass surface being matted.
- First glass sheet 1 and second glass sheet 2 were both transparent, clear glass and the adhesive composition was colored.
- the adhesive composition comprised 96.6 parts by weight Shell Chemical's Epikote 828 as the adhesive compound, 1.9 parts by weight hydroxyphenyl benezotriazole as the ultraviolet ray absorbent, and 1.5 parts by weight the mixture of CIBA-GEIGY Microlith Yellow and Microlith Red as the coloring agent.
- the adhesive composition was applied at a thickness of 0.38 mm.
- the laminate was placed in front of a television set to measure the flow through rate of ultraviolet rays and the reflection. The following results were obtained.
- ultraviolet ray (wave length: 360 mm -380 mm) :
- the convex surface of the laminate of Example 1 was matted. Reflection was completely eliminated.
- a laminate according to the second embodiment was prepared, with both of first and second glassed being colored and the adhesive compound clear.
- the adhesive composition comprised 98 parts by weight Shell Chemicals Epikote 828 as the adhesive compound and 2 parts by weight hydroxyphenylbenzotrizole as the ultraviolet ray absorbent. Neither side of the laminate was matted.
- the test results were as follows:
- the convex surface of the laminate of Example 3 was matted as described above. Reflection was completely eliminated.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Laminated Bodies (AREA)
- Glass Compositions (AREA)
- Optical Filters (AREA)
- Adhesives Or Adhesive Processes (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU14273/83A AU558815B2 (en) | 1983-05-11 | 1983-05-05 | Filter glass for cathode ray tubes |
ZA00833205A ZA833205B (en) | 1983-05-11 | 1983-05-05 | Filter glass for cathode ray tubes |
EP83302667A EP0125356B1 (fr) | 1983-05-11 | 1983-05-11 | Arrangement de filtre pour tube à rayon cathodique |
DE8383302667T DE3374037D1 (en) | 1983-05-11 | 1983-05-11 | Filter arrangement for cathode ray tubes |
AT83302667T ATE30198T1 (de) | 1983-05-11 | 1983-05-11 | Filteranordnung fuer kathodenstrahlroehre. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP83302667A EP0125356B1 (fr) | 1983-05-11 | 1983-05-11 | Arrangement de filtre pour tube à rayon cathodique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0125356A1 true EP0125356A1 (fr) | 1984-11-21 |
EP0125356B1 EP0125356B1 (fr) | 1987-10-07 |
Family
ID=8191152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83302667A Expired EP0125356B1 (fr) | 1983-05-11 | 1983-05-11 | Arrangement de filtre pour tube à rayon cathodique |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0125356B1 (fr) |
AT (1) | ATE30198T1 (fr) |
AU (1) | AU558815B2 (fr) |
DE (1) | DE3374037D1 (fr) |
ZA (1) | ZA833205B (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0277025A1 (fr) * | 1987-01-29 | 1988-08-03 | Visual Ease, Inc. | Dispositif pour le confort des yeux |
FR2685153A1 (fr) * | 1991-12-11 | 1993-06-18 | Faroughy Dara | Filtres polarisants et diffusants pour des moniteurs cathodiques. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2734142A (en) * | 1956-02-07 | Cathode ray tubes | ||
US2943964A (en) * | 1958-06-17 | 1960-07-05 | Goldenberg Max | Television viewing screen |
US4034895A (en) * | 1975-10-21 | 1977-07-12 | Enid Ortiz | Device for keeping bread fresh |
US4039719A (en) * | 1967-12-29 | 1977-08-02 | Ppg Industries, Inc. | Laminated safety glass |
US4354739A (en) * | 1980-09-03 | 1982-10-19 | Optical Coating Laboratory, Inc. | Color absorption-type filter and method of making |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2461464A (en) * | 1947-11-14 | 1949-02-08 | Aronstein Robert | Filter for fluorescent screens |
-
1983
- 1983-05-05 ZA ZA00833205A patent/ZA833205B/xx unknown
- 1983-05-05 AU AU14273/83A patent/AU558815B2/en not_active Ceased
- 1983-05-11 AT AT83302667T patent/ATE30198T1/de active
- 1983-05-11 DE DE8383302667T patent/DE3374037D1/de not_active Expired
- 1983-05-11 EP EP83302667A patent/EP0125356B1/fr not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2734142A (en) * | 1956-02-07 | Cathode ray tubes | ||
US2943964A (en) * | 1958-06-17 | 1960-07-05 | Goldenberg Max | Television viewing screen |
US4039719A (en) * | 1967-12-29 | 1977-08-02 | Ppg Industries, Inc. | Laminated safety glass |
US4034895A (en) * | 1975-10-21 | 1977-07-12 | Enid Ortiz | Device for keeping bread fresh |
US4354739A (en) * | 1980-09-03 | 1982-10-19 | Optical Coating Laboratory, Inc. | Color absorption-type filter and method of making |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0277025A1 (fr) * | 1987-01-29 | 1988-08-03 | Visual Ease, Inc. | Dispositif pour le confort des yeux |
FR2685153A1 (fr) * | 1991-12-11 | 1993-06-18 | Faroughy Dara | Filtres polarisants et diffusants pour des moniteurs cathodiques. |
Also Published As
Publication number | Publication date |
---|---|
ZA833205B (en) | 1984-04-26 |
AU558815B2 (en) | 1987-02-12 |
AU1427383A (en) | 1984-11-08 |
EP0125356B1 (fr) | 1987-10-07 |
ATE30198T1 (de) | 1987-10-15 |
DE3374037D1 (en) | 1987-11-12 |
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