US3581135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color tube electron shield having outwardly bowed edges directed toward viewing screen to minimize seal edge interference
Assignee: Admiral Corp
•
Filing: 1968-11-18
•
Granted: 1971-05-25
•
Expires: 1988-11-18
Abstract
Abstract An electron barrier consisting of two identical shields of semirigid formed aluminum foil having forwardly bowed edges resiliently contacting the inner wall of a color picture tube panel well below frit seal line. The shadow-mask frame includes a lip cooperating with raised portions on the shields to insure flexure of the bowed edges during installation.
Inventors
- 👤 Elgie E Garrett
- 👤 Thomas P De Franco
- 👤 Nicholas B Staples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:55
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J29/073; H01J2229/00; H01J2229/07; H01J2229/0722
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A color television picture tube comprising an evacuated envelope having a front panel including a curved viewing surface and a peripheral wall terminating in a seal edge; a viewing screen consisting of a color phosphor mosaic deposited on the inside of said viewing surface; a foraminous mask spaced a predetermined distance from said mosaic; a rigid windowlike frame supporting said mask; a plurality of mounting studs arranged about the interior of said peripheral wall; spring means for removably attaching said frame to said mounting studs; said frame nEcessarily being smaller than said panel to allow ready insertion and removal therefrom during tube fabrication and creating a peripheral gap between the edge of said frame and said panel through which overscanned electrons may travel resulting in spurious edge bombardment of said mosaic; said frame being mounted to said panel such that no portion thereof extends beyond said seal edge; and electron foil shield including a bowed outer portion extending toward said viewing surface for snugly bridging said gap without danger of interference with said seal edge.
Claim 2
Dependent Claim
175 words
A color television picture tube comprising an evacuated envelope having a front panel including a curved viewing surface and a peripheral wall terminating in a seal edge; a viewing screen consisting of a color phosphor mosaic deposited on the inside of said viewing surface; a foraminous mask spaced a predetermined distance from said mosaic; a rigid windowlike frame supporting said mask; a plurality of mounting studs arranged about the interior of said peripheral wall; spring means for removably attaching said frame to said mounting studs; said frame nEcessarily being smaller than said panel to allow ready insertion and removal therefrom during tube fabrication and creating a peripheral gap between the edge of said frame and said panel through which overscanned electrons may travel resulting in spurious edge bombardment of said mosaic; said frame being mounted to said panel such that no portion thereof extends beyond said seal edge; and electron foil shield including a bowed outer portion extending toward said viewing surface for snugly bridging said gap without danger of interference with said seal edge.
Claim 3
Dependent Claim
77 words
A color television picture tube as set forth in claim 1 wherein said electron foil shield is fabricated to rigid metal having a raised inner portion opposite said bowed outer portion; said windowlike frame having a upstanding peripheral lip about the opening therein; said rigid foil being compressed between said peripheral lip and said peripheral wall to slightly flex said bowed outer portion and insure closure of said gap; and means securing said foil to said frame.
Claim 4
Dependent Claim
134 words
A color television picture tube as set forth in claim 2 wherein said windowlike frame has a flat surface, in parallel with said viewing screen, to which said foil is mounted; and wherein said spring means include; a plurality of L-shaped mounting brackets each having a first leg secured to said surface and a second leg extending toward said screen and parallel to said peripheral wall, and a spring secured to each said second leg for resiliently supporting said frame on said mounting studs; said mounting brackets extending a substantial distance into said gap; said shield overlying said mounting brackets and said bowed outer portion extending toward said viewing surface in a converging path with said peripheral wall to enable flexible contact therebetween well below said seal edge without interference with said mounting brackets.
Claim 5
Dependent Claim
42 words
A color television picture tube as set forth in claim 3 wherein said mounting brackets extend above said surface and wherein said foil is fabricated with salient areas overlying said mounting brackets, to insure good engagement between said foil and said frame.
Claim 6
Dependent Claim
38 words
A color television picture tube as set forth in claim 4 wherein said means securing said foil to said frame include a plurality of clips cooperating with said peripheral lip to maintain said inner portion against said lip.
Claim 7
Dependent Claim
149 words
A color television picture tube including a front panel having a peripheral wall terminating in a seal edge; a shadow mask; a windowlike frame supporting said shadow mask; a number of mounting studs symmetrically disposed about said peripheral wall; mounting means removably attaching said frame to said mounting studs; said frame being substantially similar in shape, but smaller than said panel and positioned below said seal edge; and an electron shield closing the gap between said frame and said peripheral wall comprising two identical semirigid formed sheets of metallic foil, each having an outer bowed portion said shield being of similar shape, but of greater size than the area defined by the perimeter of said peripheral wall and the opening in said frame; and means maintaining said shield in position on said frame with said outer bowed portion contacting said peripheral wall a substantial distance below said seal edge.
Claim 8
Dependent Claim
149 words
A color television picture tube including a front panel having a peripheral wall terminating in a seal edge; a shadow mask; a windowlike frame supporting said shadow mask; a number of mounting studs symmetrically disposed about said peripheral wall; mounting means removably attaching said frame to said mounting studs; said frame being substantially similar in shape, but smaller than said panel and positioned below said seal edge; and an electron shield closing the gap between said frame and said peripheral wall comprising two identical semirigid formed sheets of metallic foil, each having an outer bowed portion said shield being of similar shape, but of greater size than the area defined by the perimeter of said peripheral wall and the opening in said frame; and means maintaining said shield in position on said frame with said outer bowed portion contacting said peripheral wall a substantial distance below said seal edge.
Claim 9
Dependent Claim
80 words
A color television picture tube as set forth in claim 6 wherein said windowlike frame includes a lip about the opening therein and wherein said sheets of metallic foil include an upturned edge portion for cooperation with said lip, the distance between said lip and said peripheral wall being slightly less than the corresponding dimension on said metallic foil whereby said outer bowed portion is flexed slightly in positioning said shield to insure a good fit with said peripheral wall.
Claim 10
Dependent Claim
43 words
A color television picture tube as set forth in claim 7 wherein said means maintaining said shield in position comprise spring clips adapted to fit over said lip of said frame and urge said upturned edge portions into close engagement with said lip.
Claim 11
Dependent Claim
51 words
A color television picture tube as set forth in claim 8 wherein said mounting means include L-shaped mounting brackets secured to the surface of said frame and wherein each foil sheet has raised areas formed therein corresponding to the locations of said L-brackets when positioned in either of its two positions.
References Cited (Backward Citations)
US3377493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |