US4846551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical filter assembly for enhancement of image contrast and glare reduction of cathode ray display tube
Assignee: Viavi Solutions Inc
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Filing: 1988-04-11
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Granted: 1989-07-11
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Expires: 2008-04-11
Abstract
Abstract An optical interference filter structure incorporates antireflectance and light absorbing elements disposed on a substrate. The filter structure is shaped to conform substantially to the face of a cathode ray tube or other luminous display, such as a cathode ray tube for example. The materials of the elements are selected for their characteristics including indices of refraction, light absorption and chromatic filtering so that in combination they provide optimum antireflectance, antiglare and image contrast features.
Inventors
- 👤 James D. Rancourt
- 👤 John S. Matteucci
- 👤 Michael W. Andreasen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:11
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; G02B1/116; H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/898; C; C03; C03C; C03C2217/00; C03C2217/70; C03C2217/73
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
56 words
An optical filter structure for use with a cathode ray tube or other luminous display comprising: a substantially transparent plastic substrate; first and second achromatizing layers successively deposited over said substrate; an adhesive layer of aluminum oxide disposed between said substrate and said achromatizing layers; and a single period dark mirror deposited over said achromatizing layers.
Claim 2
Dependent Claim
56 words
An optical filter structure for use with a cathode ray tube or other luminous display comprising: a substantially transparent plastic substrate; first and second achromatizing layers successively deposited over said substrate; an adhesive layer of aluminum oxide disposed between said substrate and said achromatizing layers; and a single period dark mirror deposited over said achromatizing layers.
Claim 3
Dependent Claim
42 words
An optical filter structure as in claim 1, wherein said first achromatizing layer is made of magnesium fluoride and said second layer is made of a material selected from a group consisting primarily of cerium stannate, zirconium oxide and indium tin oxide.
Claim 4
Dependent Claim
26 words
An optical filter structure as in claim 1, wherein said single period dark mirror comprises a nickel thin film and a magnesium flouride layer deposited thereon.
Claim 5
Dependent Claim
115 words
In an optical filter assembly for enhancement of image contrast and for glare reduction of a luminous display, a flexible substantially transparent substrate formed of a thermo formed plastic having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces with the front surface having a two-dimensional curvature, an adhesive hardcoat deposited on front surface of said substrate, a multilayer interference coating deposited on said adhesive hardcoat, said multilayer interference coating being comprised of at least two periods with each period being formed of a metal layer and a dielectric layer, said multilayer interference coating serving to enhance the display from the luminous display by balancing light absorption and transmission.
Claim 6
Dependent Claim
115 words
In an optical filter assembly for enhancement of image contrast and for glare reduction of a luminous display, a flexible substantially transparent substrate formed of a thermo formed plastic having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces with the front surface having a two-dimensional curvature, an adhesive hardcoat deposited on front surface of said substrate, a multilayer interference coating deposited on said adhesive hardcoat, said multilayer interference coating being comprised of at least two periods with each period being formed of a metal layer and a dielectric layer, said multilayer interference coating serving to enhance the display from the luminous display by balancing light absorption and transmission.
Claim 7
Dependent Claim
15 words
An assembly as in claim 4 wherein said dielectric layer is formed of magnesium flouride.
Claim 8
Dependent Claim
121 words
In an optical filter assembly for enchancement of image contrast and for glare reduction of a luminous display, a flexible, substantially transparent substrate formed of a thermoformed plastic having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, an adhesive hardcoat deposited on the front surface of said substrate, a multilayer interference coating deposited on said adhesive hardcoat, said multilayer interference coating being comprised of at least two periods with each period being formed of a metal layer and a dielectric layer, said multilayer interference coating serving to enhance the display from the luminous display by balancing light absorption and transmission, and an achromatizing layer disposed between the multilayer interference coating and the adhesive hardcoat.
Claim 9
Dependent Claim
121 words
In an optical filter assembly for enchancement of image contrast and for glare reduction of a luminous display, a flexible, substantially transparent substrate formed of a thermoformed plastic having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, an adhesive hardcoat deposited on the front surface of said substrate, a multilayer interference coating deposited on said adhesive hardcoat, said multilayer interference coating being comprised of at least two periods with each period being formed of a metal layer and a dielectric layer, said multilayer interference coating serving to enhance the display from the luminous display by balancing light absorption and transmission, and an achromatizing layer disposed between the multilayer interference coating and the adhesive hardcoat.
Claim 10
Dependent Claim
24 words
An assembly as in claim 6 wherein said adhesive hardcoat layer is formed of aluminum oxide having an index of refraction of approximately 1.65.
Claim 11
Dependent Claim
18 words
An assembly as in claim 6 wherein said substrate has a thickness ranging from 0.003 to 0.007 inches.
Claim 12
Dependent Claim
20 words
An assembly as in claim 6 wherein said substrate is formed of a dyed polyester having a neutral gray hue.
Claim 13
Dependent Claim
14 words
An assembly as in claim 6 wherein said substrate is formed of polyethylene terephthalate.
Claim 14
Dependent Claim
20 words
An assembly as in claim 6 wherein said substrate is curved to conform to the contour of the luminous display.
Claim 15
Dependent Claim
28 words
An assembly as in claim 6 wherein said adhesive hardcoat has an optical thickness of about 3/8 of a wavelength at a design wavelength of approximately 500 nanometers.
Claim 16
Dependent Claim
27 words
An assembly as in claim 6 wherein said metal layer is selected from a group of metals consisting primarily of nickel, molybdenum, chromium, tantalum, Nichrome and Inconel.
Claim 17
Dependent Claim
11 words
An assembly as in claim 6 wherein said metal is nickel.
Claim 18
Dependent Claim
140 words
In an optical filter assembly for enhancement of image contrast and for glare reduction of a luminous display, a flexible, substantially transparent substrate formed of a thermo-formed plastic having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, an adhesive hardcoat deposited on front surface of said substrate, a multilayer interference coating deposited on said adhesive hardcoat, said multilayer interference coating being comprised of at least two periods with each period being formed of a metal layer and a dielectric layer, said multilayer interference coating serving to enhance the display from the luminous display by balancing light absorption and transmission, and a layer of achromatizing material disposed between the hardcoat and the multilayer interference coating, said achromatizing material being selected from the group consisting primarily of cerium stannate, zirconium oxide and indium tin oxide.
Claim 19
Dependent Claim
140 words
In an optical filter assembly for enhancement of image contrast and for glare reduction of a luminous display, a flexible, substantially transparent substrate formed of a thermo-formed plastic having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, an adhesive hardcoat deposited on front surface of said substrate, a multilayer interference coating deposited on said adhesive hardcoat, said multilayer interference coating being comprised of at least two periods with each period being formed of a metal layer and a dielectric layer, said multilayer interference coating serving to enhance the display from the luminous display by balancing light absorption and transmission, and a layer of achromatizing material disposed between the hardcoat and the multilayer interference coating, said achromatizing material being selected from the group consisting primarily of cerium stannate, zirconium oxide and indium tin oxide.
Claim 20
Dependent Claim
26 words
An assembly as in claim 15 wherein said achromatizing material is selected from the group consisting primarily of cerium stannate, zirconium oxide and indium tin oxide.
Claim 21
Dependent Claim
117 words
In the combination of a luminous display cathode ray tube having a surface and an optical filter assembly disposed on the surface, the optical filter assembly comprising a flexible substantially transparent substrate formed of plastic and having an index of refraction U.S. Ser. No. 183,375 ranging from 1.5 to 1.8 and having front and rear surfaces with the front surface having two-dimensional curvature, an adhesive hardcoat layer deposited on said front surface, a multilayer interference coating deposited on said adhesive layer and conforming to the two dimensional curvature of the front surface, said multilayer interference coating comprising at least two periods with each period being comprised of a light absorbing thin metal layer and an antireflection layer.
Claim 22
Dependent Claim
117 words
In the combination of a luminous display cathode ray tube having a surface and an optical filter assembly disposed on the surface, the optical filter assembly comprising a flexible substantially transparent substrate formed of plastic and having an index of refraction U.S. Ser. No. 183,375 ranging from 1.5 to 1.8 and having front and rear surfaces with the front surface having two-dimensional curvature, an adhesive hardcoat layer deposited on said front surface, a multilayer interference coating deposited on said adhesive layer and conforming to the two dimensional curvature of the front surface, said multilayer interference coating comprising at least two periods with each period being comprised of a light absorbing thin metal layer and an antireflection layer.
Claim 23
Dependent Claim
124 words
In the combination of a luminous display cathode ray tube having a surface and an optical filter assembly disposed on the surface, the optical filter assembly comprising a flexible substantially transparent substrate formed of plastic and having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, an adhesive hardcoat layer deposited on said front surface, a multilayer interference coating deposited on said adhesive layer and conforming to the two dimensional curvature of the front surface, said multilayer interference coating comprising at least two periods with each period being comprised of a light absorbing thin metal layer and an antireflection layer, (37) said filter assembly including an achromatizing layer diposed between the multilayer interference coating and the adhesive hardcoat.
Claim 24
Dependent Claim
124 words
In the combination of a luminous display cathode ray tube having a surface and an optical filter assembly disposed on the surface, the optical filter assembly comprising a flexible substantially transparent substrate formed of plastic and having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, an adhesive hardcoat layer deposited on said front surface, a multilayer interference coating deposited on said adhesive layer and conforming to the two dimensional curvature of the front surface, said multilayer interference coating comprising at least two periods with each period being comprised of a light absorbing thin metal layer and an antireflection layer, (37) said filter assembly including an achromatizing layer diposed between the multilayer interference coating and the adhesive hardcoat.
Claim 25
Dependent Claim
24 words
A combination as in claim 18 wherein said adhesive hardcoat layer is formed of aluminum oxide having an index of refraction of approximately 1.65.
Claim 26
Dependent Claim
18 words
A combination as in claim 18 wherein said substrate has a thickness ranging from 0.003 to 0.007 inches.
Claim 27
Dependent Claim
20 words
A combination as in claim 18 wherein said substrate is formed of a dyed polyester having a neutral gray hue.
Claim 28
Dependent Claim
14 words
A combination as in claim 18 wherein said substrate is formed of polyethylene terephthalate.
Claim 29
Dependent Claim
23 words
A combination as in claim 18 wherein said substrate is curved to conform to the contour of the luminous display cathode ray tube.
Claim 30
Dependent Claim
28 words
A combination as in claim 18 wherein said adhesive hardcoat has an optical thickness of about 3/8 of a wavelength at a design wavelength of approximately 500 nanometers.
Claim 31
Dependent Claim
27 words
A combination as in claim 18 wherein said metal layer is selected from a group of metals consisting primarily of nickel, molybdenum, chromium, tantalum, nichrome and inconcel.
Claim 32
Dependent Claim
11 words
A combination as in claim 18 wherein said metal is nickel.
Claim 33
Dependent Claim
15 words
A combination as in claim 18 wherein said antireflective layer is formed of magnesium fluoride.
Claim 34
Dependent Claim
26 words
A combination as in claim 18 wherein said achromatizing material is selected from the group consisting primarily of cerium stannate, zirconium oxide and indium tin oxide.
Claim 35
Dependent Claim
61 words
A combination as in claim 18 wherein the luminous display of the cathode ray tube has a curved surface and wherein the plastic is a thermoformed plastic which has been formed to conform to the curvature of the luminous display together with means for securing the optical filter assembly to the luminous display so that it is in close proximity thereto.
Claim 36
Dependent Claim
20 words
A combination of claim 18 together with a frame and means for mounting said optical filter assembly in said frame.
Claim 37
Dependent Claim
104 words
In a method for producing an optical filter assembly for enhancement of image contrast and for glare reduction of a luminous display from a cathode ray tube having a face plate which is curved in two dimensions, providing a flexible substantially transparent plastic substrate having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, depositing an adhesive hardcoat on the front surface of the substrate, depositing a multilayer interference coating on said adhesive hardcoat and thermoforming the plastic substrate after the interference coating has been deposited thereon to conform to the two-dimensional curvature of the cathode ray tube.
Claim 38
Dependent Claim
104 words
In a method for producing an optical filter assembly for enhancement of image contrast and for glare reduction of a luminous display from a cathode ray tube having a face plate which is curved in two dimensions, providing a flexible substantially transparent plastic substrate having an index of refraction ranging from 1.5 to 1.8 and having front and rear surfaces, depositing an adhesive hardcoat on the front surface of the substrate, depositing a multilayer interference coating on said adhesive hardcoat and thermoforming the plastic substrate after the interference coating has been deposited thereon to conform to the two-dimensional curvature of the cathode ray tube.
Claim 39
Dependent Claim
27 words
A method as in claim 31 together with the step of depositing an achromatizing layer on the adhesive hardcoat prior to deposition of the multilayer interference coating.
References Cited (Backward Citations)
US3516720A
Cited
US3576356A
Cited
US3804491A
Cited
US3935351A
Cited
US4161547A
Cited
US4132919A
Cited
US4387960A
Cited
US4333983A
Cited
US4465337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |