US4370592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color picture tube having an improved inline electron gun with an expanded focus lens
Assignee: RCA Licensing Corp
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Filing: 1980-10-29
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Granted: 1983-01-25
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Expires: 2000-10-29
Abstract
Abstract The present invention relates to an improvement in a color picture tube having an inline electron gun, for generating and directing a plurality of electron beams along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The improvement comprises a change in the two spaced gun electrodes that form the main focus lens. Each electrode includes a plurality of apertures therein equal to the number of electron beams. Each electrode also includes a peripheral rim with the peripheral rims of the two electrodes facing each other. The apertured portion of each electrode is located within a recess set back from the rim. The recess has substantially straight wall sections parallel to the paths of the electron beams.
Inventors
- 👤 Richard H. Hughes
- 👤 Bruce G. Marks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:32
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/58; H01J29/62; H01J29/503
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
In a color picture tube havinng an inline electron gun for generating and directing a plurality of electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrodes, each electrode including a portion having a plurality of apertures therein equal to the number of electron beams, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, said recess having substantially straight wall sections parallel to the coplanar paths of the electron beams.
Claim 2
Dependent Claim
119 words
In a color picture tube havinng an inline electron gun for generating and directing a plurality of electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrodes, each electrode including a portion having a plurality of apertures therein equal to the number of electron beams, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, said recess having substantially straight wall sections parallel to the coplanar paths of the electron beams.
Claim 3
Dependent Claim
38 words
The tube as defined in claim 1, wherein the recess width in the plane of the electron beams is greater in the main focus lens electrode closest to the screen than in the other main focus lens electrode.
Claim 4
Dependent Claim
106 words
In a color picture tube having an inline electron gun for generating and directing three electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrode members each having three separate inline apertures therein, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, the rims having substantially straight sections parallel to the coplanar paths of the electron beams.
Claim 5
Dependent Claim
106 words
In a color picture tube having an inline electron gun for generating and directing three electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrode members each having three separate inline apertures therein, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, the rims having substantially straight sections parallel to the coplanar paths of the electron beams.
Claim 6
Dependent Claim
38 words
The tube as defined in claim 3, wherein the recess width in the plane of the electron beams is greater in the main focus lens electrode closest to the screen than in the other main focus lens electrode.
Claim 7
Dependent Claim
118 words
In a color picture tube having an inline electron gun for generating and directing a plurality of electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrodes, each electrode including a portion having a plurality of apertures therein equal to the number of electron beams, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, and means on said gun for correcting for astigmatism formed by the main focus lens.
Claim 8
Dependent Claim
118 words
In a color picture tube having an inline electron gun for generating and directing a plurality of electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrodes, each electrode including a portion having a plurality of apertures therein equal to the number of electron beams, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, and means on said gun for correcting for astigmatism formed by the main focus lens.
Claim 9
Dependent Claim
38 words
The tube is defined in claim 5, wherein the recess width in the plane of the electron beams is greater in the main focus lens electrode closest to the screen than in the other main focus lens electrode.
Claim 10
Dependent Claim
29 words
The tube as defined in claim 5 wherein said means for correcting for astigmatism comprises a slot on said gun located between the main focus lens and said screen.
Claim 11
Dependent Claim
15 words
The tube as defined in claim 7 wherein said slot is formed by two strips.
Claim 12
Dependent Claim
121 words
In a color picture tube having an inline electron gun for generating and directing three electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrode members each having three separate inline apertures therein, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, and the electrode of said main focus lens closest to said screen including a slot on the side facing the screen, said slot extending across the three electron beam paths.
Claim 13
Dependent Claim
121 words
In a color picture tube having an inline electron gun for generating and directing three electron beams along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, the improvement comprising the main focus lens being formed by two spaced electrode members each having three separate inline apertures therein, each electrode also including a peripheral rim, the peripheral rims of the two electrodes facing each other, the apertured portion of each electrode being within a recess set back from the rim, and the electrode of said main focus lens closest to said screen including a slot on the side facing the screen, said slot extending across the three electron beam paths.
Claim 14
Dependent Claim
37 words
The tube as defined in claim 9, wherein the recess width in the plane of the electron beams is greater in the main focus lens electrode closest to the screen than in the othermain focus lens electrode.
Claim 15
Dependent Claim
18 words
The tube as defined in claim 9, wherein said slot of said plate is formed by two strips.
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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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |