Patent US4577928A successfully refreshed from Google Patents.
US4577928A
Expired / Lapsed
US
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CRT magnifying lens attachment and glare reduction system
Assignee: Data Vu Co
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Filing: 1985-07-02
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Granted: 1986-03-25
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Expires: 2005-07-02
Abstract
Abstract A CRT magnifying lens attachment and glare reduction system for use with a computer display screen. The attachment supports the magnifying lens and glare reduction system adjacent the display screen. The magnifying lens and glare reduction system includes at least on fresnel lens positioned adjacent an optical element, the optical element reduces glare and enhances the image produced by the screen.
Inventors
- 👤 Eugene C. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:18
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/72; G; G06; G06F; G06F1/00; G06F1/16; G06F1/1601; G06F1/1607; G06F1/1609; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J2229/00; H01J2229/89; H01J2229/8901; H01J2229/893
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
An optical element for magnifying and enhancing the image projected from a screen and for reducing glare produced by light generated externally of said screen and reflected from said screen, comprising: at least one fresnel lens supported adjacent said screen for magnifying the image generated by said screen; a laminated light filter supported adjacent and parallel to said fresnel lens for reducing said glare and for enhancing said image; said laminated light filter having a first element to retard said light generated externally and passing therethrough; a second element positioned parallel to and adjacent said first element to vary the color of the image projected from said screen; and a third element positioned parallel to and adjacent said first and second element to capture said retarded light preventing said light from exiting said filter; whereby said glare is reduced and said images magnified and enhanced.
Claim 2
Dependent Claim
145 words
An optical element for magnifying and enhancing the image projected from a screen and for reducing glare produced by light generated externally of said screen and reflected from said screen, comprising: at least one fresnel lens supported adjacent said screen for magnifying the image generated by said screen; a laminated light filter supported adjacent and parallel to said fresnel lens for reducing said glare and for enhancing said image; said laminated light filter having a first element to retard said light generated externally and passing therethrough; a second element positioned parallel to and adjacent said first element to vary the color of the image projected from said screen; and a third element positioned parallel to and adjacent said first and second element to capture said retarded light preventing said light from exiting said filter; whereby said glare is reduced and said images magnified and enhanced.
Claim 3
Dependent Claim
120 words
The optical element of claim 1, further comprising a frame attached about the periphery of said optical element for holding said optical element spaced from said visual display screen, said frame having a front face with an opening therein for viewing said optical element and a peripheral edge extending perpendicular to and rearwardly from said front face, a pivot means attached to said edge pivotally attaching said frame to said unit whereby said frame may be adjusted with respect to said screen about a horizontal axis extending through the center line of said pivot means, and adjustable supports attached between said frame and said unit whereby said frame may be retained in a selected position with respect to said screen.
Claim 4
Dependent Claim
14 words
The optical element of claim 2, wherein said pivot means comprises a velcro fastener.
Claim 5
Dependent Claim
27 words
The optical element of claim 1, wherein said element is attached by attaching means directly to said screen, said attaching means comprising two faced optical adhesive tape.
Claim 6
Independent Claim
87 words
A method for correcting the image produced by a fresnel lens having chromatic aberrations therein, said chromatic aberrations creating a band of colors consisting of reds, greens, and blues said reds being distracting to a person viewing said screen, comprising the steps of: affixing a one quarter wave retarding element to a fresnel lens; affixing a linearly polarizing element to said one quarter wave retarding element; rotating said linear polarizing element 45 degrees with respect to said retarding element overlapping said red and blue bands of color.
Claim 7
Independent Claim
87 words
A method for correcting the image produced by a fresnel lens having chromatic aberrations therein, said chromatic aberrations creating a band of colors consisting of reds, greens, and blues said reds being distracting to a person viewing said screen, comprising the steps of: affixing a one quarter wave retarding element to a fresnel lens; affixing a linearly polarizing element to said one quarter wave retarding element; rotating said linear polarizing element 45 degrees with respect to said retarding element overlapping said red and blue bands of color.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |