US4607188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monochrome cathode ray tube for use as a color reference
Assignee: Philips North America LLC
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Filing: 1985-04-03
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Granted: 1986-08-19
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Expires: 2005-04-03
Abstract
Abstract By adjusting the exposure dosages for the three primary color phosphors in the photolithographic process used to produce color CRTs for color television, standard whites of desired color temperatures are obtained. The aperture mask used in the photolithographic process is then discarded, and the CRT is operated as a monochrome tube in a standard receiver. Stable, rugged and portable color references are thus produced.
Inventors
- 👤 Matthew S. Brennesholtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:29
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
A monochrome cathode ray tube for use as a color reference, the tube comprising an evacuated glass envelope having integrated face panel, funnel and neck portions, a phosphor screen disposed on the interior surface of the face panel, and an electron gun located in the neck, the gun having a plurality of electrodes including a terminal anode, for forming and directing one or more electron beams onto the screen to excite the phosphor, a conductive coating on the interior surface of the screen, and a conductive coating on the interior surface of the envelope for interconnecting the screen coating and the anode, characterized in that the screen is comprised of at least one field of repetitive patterned array of discrete phosphor elements of at least two alternating colors, the sizes of the elements being constant for each color, and the relative sizes of the different color elements being predetermined to result in a standard color when the array is scanned by an electron beam from the electron gun of predetermined beam current and anode voltage.
Claim 2
Dependent Claim
175 words
A monochrome cathode ray tube for use as a color reference, the tube comprising an evacuated glass envelope having integrated face panel, funnel and neck portions, a phosphor screen disposed on the interior surface of the face panel, and an electron gun located in the neck, the gun having a plurality of electrodes including a terminal anode, for forming and directing one or more electron beams onto the screen to excite the phosphor, a conductive coating on the interior surface of the screen, and a conductive coating on the interior surface of the envelope for interconnecting the screen coating and the anode, characterized in that the screen is comprised of at least one field of repetitive patterned array of discrete phosphor elements of at least two alternating colors, the sizes of the elements being constant for each color, and the relative sizes of the different color elements being predetermined to result in a standard color when the array is scanned by an electron beam from the electron gun of predetermined beam current and anode voltage.
Claim 3
Dependent Claim
14 words
The tube of claim 1 in which the array consists of three alternating colors.
Claim 4
Dependent Claim
14 words
The tube of claim 2 in which the colors are red, green and blue.
Claim 5
Dependent Claim
16 words
The tube of claim 1 in which the elements are separated by a light absorbing matrix.
Claim 6
Dependent Claim
13 words
The tube of claim 1 in which the elements are continuous vertical stripes.
Claim 7
Dependent Claim
22 words
The tube of claim 1 in which the screen comprises a plurality of fields, each field having a different standard color array.
Claim 8
Dependent Claim
29 words
The tube of claim 1 in which the screen comprises a plurality of fields, at least one of which is an array of phosphor elements of only one color.
Claim 9
Dependent Claim
45 words
The tube of claim 7 in which the screen comprises four fields, a first field of an array of red, green and blue phosphor elements, a second field of red phosphor elements, a third field of green elements, and a fourth field of blue elements.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |