Patent US4872749A successfully refreshed from Google Patents.
US4872749A
Expired / Lapsed
US
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Lens for video terminal screen
Assignee: Cabot Safety Intermediate LLC
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Filing: 1984-09-14
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Granted: 1989-10-10
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Expires: 2004-09-14
Abstract
Abstract A method and lens are disclosed for improving the visual comfort and perceived vision of a person viewing an image transmitted from a video display terminal. The use of a lens tint complementary to the image color on the terminal screen is employed to improve screen contrast and reduce fatigue.
Inventors
- 👤 David J. Lummis
- 👤 Jon D. Masso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:26
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223; H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J2229/00; H01J2229/89; H01J2229/893
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A method for improving the visual comfort and perceived vision of a person viewing a monochromatic phosphor image on a video display terminal screen, the monochormatic phosphor image being formed by radiation at a primary phosphor emission which comprises causing said person to view said image through a spectacle lens which has been tinted a color which is approximately the complement to the color of said monochromatic phosphor image wherein said spectacle lens blocks said radiation at the primary phosphor emission and transmits light at other wavelengths.
Claim 2
Independent Claim
87 words
A method for improving the visual comfort and perceived vision of a person viewing a monochromatic phosphor image on a video display terminal screen, the monochormatic phosphor image being formed by radiation at a primary phosphor emission which comprises causing said person to view said image through a spectacle lens which has been tinted a color which is approximately the complement to the color of said monochromatic phosphor image wherein said spectacle lens blocks said radiation at the primary phosphor emission and transmits light at other wavelengths.
Claim 3
Dependent Claim
25 words
A method as recited in claim 1 wherein the lens has been treated so as to transmit approximately 70% to 85% of incident visible light.
Claim 4
Dependent Claim
41 words
A method as recited in claim 1 wherein the lens has been treated with an anti-reflective coating which increases the transmittance of said lenses by about 2 to 7% and decreases the reflectance of said lenses by about 2 to 7%.
Claim 5
Dependent Claim
50 words
A method as recited in claim 1 wherein the complement is defined as the color indicated on the chart of FIG. 2 as a point situated approximately on the opposite side of the center point or white light point of said chart from the point which defines the image color.
Claim 6
Dependent Claim
64 words
A method as recited in claim 1 wherein the complement is defined as the color indicated on the chart of FIG. 2 by a chromaticity coordinate situated approximately on the line passing through the coordinate which defines the image color and the white light or C coordinate and situated on the side opposite said white light or C coordinate from the image color coordinate.
Claim 7
Dependent Claim
20 words
A method as recited in claim 5 wherein the image color is amber (red-orange) and the lens is tinted blue.
Claim 8
Dependent Claim
19 words
A method as recited in claim 5 wherein the image color is green and the lens is tinted magenta.
Claim 9
Dependent Claim
31 words
A method as recited in claim 5 wherein the lens is additionally treated with compositions selected from the group consisting of ultra-violet absorbers, infra-red absorbers, scratch resistant coatings, and combinations thereof.
Claim 10
Dependent Claim
81 words
In combination, a video display terminal screen capable of producing a monochromatic phosphor image for viewing by a person, the monochormatic phosphor image being formed by radiation at a primary phosphor emission and a spectacle lens through which said person views said monochormatic phosphor image, said spectacle lens being tinted a color which is approximately the complement to the color of said image wherein said spectacle lens blocks said radiation at the primary phosphor emission and transmits light at other wavelengths.
Claim 11
Dependent Claim
81 words
In combination, a video display terminal screen capable of producing a monochromatic phosphor image for viewing by a person, the monochormatic phosphor image being formed by radiation at a primary phosphor emission and a spectacle lens through which said person views said monochormatic phosphor image, said spectacle lens being tinted a color which is approximately the complement to the color of said image wherein said spectacle lens blocks said radiation at the primary phosphor emission and transmits light at other wavelengths.
Claim 12
Dependent Claim
17 words
A combination according to claim 9 wherein said image is amber and said lens is tinted blue.
Claim 13
Dependent Claim
17 words
A combination according to claim 9 wherein said image is green and said lens is tinted magenta.
References Cited (Backward Citations)
US3078343A
Cited
DE2317642A1
Cited
DE2445794A1
Cited
US4049339A
Cited
GB2055225A
Cited
US4470673A
Cited
WO1985005701A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |