US4388552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color picture tube having an improved expanded focus lens type inline electron gun
Assignee: RCA Licensing Corp
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Filing: 1981-07-10
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Granted: 1983-06-14
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Expires: 2001-07-10
Abstract
Abstract An improved color picture tube has an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The main focus lens is formed by two spaced electrode members each having three separate inline apertures therein. Each electrode also includes a peripheral rim. The peripheral rims of the two electrodes face each other. The apertured portion of each electrode is within a recess set back from the rim. The width of the recess in at least one of the electrodes is wider at the side beam paths than at the outer beam path, measured perpendicular to the plane containing the electron beam paths.
Inventors
- 👤 Paul T. Greninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:25
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/58; H01J29/62; H01J29/503
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
In a color picture tube having an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, 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, and the apertured portion of each electrode being within a recess set back from the rim, the improvement comprising the width of the recess at least at the rim in at least one of the electrodes being wider at the side beam paths than at the center beam path, measured perpendicular to the plane containing the electron beam paths.
Claim 2
Dependent Claim
139 words
In a color picture tube having an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, 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, and the apertured portion of each electrode being within a recess set back from the rim, the improvement comprising the width of the recess at least at the rim in at least one of the electrodes being wider at the side beam paths than at the center beam path, measured perpendicular to the plane containing the electron beam paths.
Claim 3
Dependent Claim
141 words
In a color picture tube having an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, 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, and the apertured portion of each electrode being within a recess set back from the rim, the improvement comprising the width of the rim in at least one of the electrodes being narrower at the side beam paths than at the center beam path, the rim width being the rim thickness measured perpendicular to the plane containing the electron beam paths.
Claim 4
Dependent Claim
141 words
In a color picture tube having an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of said tube, said gun including a main focus lens for focusing said electron beams, 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, and the apertured portion of each electrode being within a recess set back from the rim, the improvement comprising the width of the rim in at least one of the electrodes being narrower at the side beam paths than at the center beam path, the rim width being the rim thickness measured perpendicular to the plane containing the electron beam paths.
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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |