Patent US3601650A successfully refreshed from Google Patents.
US3601650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated shadow mask structure
Assignee: Zenith Electronics LLC
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Filing: 1969-08-11
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Granted: 1971-08-24
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Expires: 1989-08-11
Abstract
Abstract The shadow mask of a color cathode-ray tube is constructed of a single piece of metal formed to have a color-selection portion with a field of apertures and also to have a circumscribing mounting frame contiguous to the color-selection portion. A stiffening rib is pressed into the mounting frame to add mechanical strength and the mounting springs further contribute to strengthening the structure. Each spring extends from a baseplate which bridges the stiffening rib of the frame and is welded to the frame on opposite sides of the stiffening rib.
Inventors
- 👤 Nicholas P Pappadis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:35
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J29/073; H01J2229/00; H01J2229/07; H01J2229/0722; H01J2229/0727; H01J2229/0766; H01J2229/0772
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
In a color cathode-ray tube, a shadow mask structure having a color-selection portion including a plurality of apertures and a circumscribing frame of L-shaped cross section extending from said color-selection portion and formed therewith from a unitary sheet of material and having a stiffening rib pressed into that part of said frame which is contiguous to said color-selection portion, an improved electron shield and mounting arrangement for releasably attaching the shadow mask structure to mounting studs projecting inwardly from the envelope of the tube which arrangement comprises: a plurality of at least three mounting springs secured to the two sides and to at least the top or bottom of said part of said frame, each of said mounting springs having a baseplate bridging said rib and mechanically secured to said part of said L-shaped frame on opposite sides of said rib and further having a leaf spring extending from and out of the plane of said baseplate and having an aperture in the free end thereof dimensioned to releasably receive one of said mounting studs; and a frame of the same configuration as the field of apertures in said color-selection portion, having a reinforcing rib of zigzag configuration pressed therein, and superposed over the part of said L-shaped frame that is substantially parallel to said color-selection portion.
Claim 2
Dependent Claim
217 words
In a color cathode-ray tube, a shadow mask structure having a color-selection portion including a plurality of apertures and a circumscribing frame of L-shaped cross section extending from said color-selection portion and formed therewith from a unitary sheet of material and having a stiffening rib pressed into that part of said frame which is contiguous to said color-selection portion, an improved electron shield and mounting arrangement for releasably attaching the shadow mask structure to mounting studs projecting inwardly from the envelope of the tube which arrangement comprises: a plurality of at least three mounting springs secured to the two sides and to at least the top or bottom of said part of said frame, each of said mounting springs having a baseplate bridging said rib and mechanically secured to said part of said L-shaped frame on opposite sides of said rib and further having a leaf spring extending from and out of the plane of said baseplate and having an aperture in the free end thereof dimensioned to releasably receive one of said mounting studs; and a frame of the same configuration as the field of apertures in said color-selection portion, having a reinforcing rib of zigzag configuration pressed therein, and superposed over the part of said L-shaped frame that is substantially parallel to said color-selection portion.
Claim 3
Dependent Claim
186 words
In a color cathode-ray tube, a shadow mask structure having a color-selection portion including a plurality of apertures aNd a circumscribing frame of L-shaped cross section extending from said color-selection portion, an improved arrangement for releasably attaching the shadow mask structure to mounting studs projecting inwardly from the envelope of the tube which arrangement comprises: a plurality of at least three mounting springs secured to the two sides and to at least the top or bottom of said frame, each of said mounting springs: (a ) having a baseplate mechanically secured to an assigned part of said frame; (b) having an elongated leaf spring disposed generally parallel to the part of said frame to which its baseplate is secured and extending from and out of the plane of said baseplate with an aperture in the free end thereof dimensioned to releasably receive an assigned one of said mounting studs; and (c) further having a bumper portion disposed transversely of the part of said frame to which its baseplate if secured and extending in the direction of and beyond the immediately contiguous part of said color-selection portion.
Claim 4
Dependent Claim
186 words
In a color cathode-ray tube, a shadow mask structure having a color-selection portion including a plurality of apertures aNd a circumscribing frame of L-shaped cross section extending from said color-selection portion, an improved arrangement for releasably attaching the shadow mask structure to mounting studs projecting inwardly from the envelope of the tube which arrangement comprises: a plurality of at least three mounting springs secured to the two sides and to at least the top or bottom of said frame, each of said mounting springs: (a ) having a baseplate mechanically secured to an assigned part of said frame; (b) having an elongated leaf spring disposed generally parallel to the part of said frame to which its baseplate is secured and extending from and out of the plane of said baseplate with an aperture in the free end thereof dimensioned to releasably receive an assigned one of said mounting studs; and (c) further having a bumper portion disposed transversely of the part of said frame to which its baseplate if secured and extending in the direction of and beyond the immediately contiguous part of said color-selection portion.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |