EP0247793A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cathode-ray tube having an internal magnetic shield
Assignee: RCA Licensing Corp
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Filing: 1987-05-21
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Granted: —
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Expires: 2007-05-21
Abstract
Abstract A cathode-ray tube (10) has a faceplate panel (12) joined to a funnel (14) along a sidewall (16) of the panel, and an internal magnetic shield (42) disposed proximate an inner surface (22) of the funnel and connected along one end (44) thereof to a back portion (28) of a shadow-mask frame (30) oriented orthogonally to a central axis (Z) of the tube and supported adjacent the sidewall. An apertured shadow mask (36) is connected along an edge (38) thereof to a front portion (40) of the shadow-mask frame opposite the back portion. Along the direction of the central axis, the one end of the magnetic shield overlaps the corresponding edge of the shadow mask around substantially all of the shadow-mask frame.
Inventors
- 👤 Albert Maxwell Morrell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:15
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A cathode-ray tube (10) having a faceplate panel (12) joined to a funnel (14) along a sidewall (16) of said panel, and an internal magnetic shield (42) disposed proximate an inner surface (22) of said funnel and connected along one end (44) thereof to a back portion (28) of a shadow-mask frame (30) oriented orthogonally to a central axis (Z) of said tube and supported adjacent said sidewall, a multi-apertured shadow mask (36) being connected along an edge (38) thereof to a front portion (40) of said shadow-mask frame opposite the back portion; characterized in that the said one end of said magnetic shield overlaps, along the direction of said central axis, the corresponding edge of said shadow mask around substantially all of said shadow-mask frame.
Claim 2
Dependent Claim
126 words
A cathode-ray tube (10) having a faceplate panel (12) joined to a funnel (14) along a sidewall (16) of said panel, and an internal magnetic shield (42) disposed proximate an inner surface (22) of said funnel and connected along one end (44) thereof to a back portion (28) of a shadow-mask frame (30) oriented orthogonally to a central axis (Z) of said tube and supported adjacent said sidewall, a multi-apertured shadow mask (36) being connected along an edge (38) thereof to a front portion (40) of said shadow-mask frame opposite the back portion; characterized in that the said one end of said magnetic shield overlaps, along the direction of said central axis, the corresponding edge of said shadow mask around substantially all of said shadow-mask frame.
Claim 3
Dependent Claim
33 words
A cathode-ray tube (10) as defined in Claim 1, characterized in that the one end (44) of said magnetic shield (42) extends forward to overlap the edge (38) of said shadow mask (36).
Claim 4
Dependent Claim
46 words
A cathode-ray tube (10) as defined in Claim 1, characterized in that said shadow mask (36) is connected to the outside of said shadow-mask frame (30), and said magnetic shield (42) is connected to the outside of said shadow-mask frame, in contact with said shadow mask.
Claim 5
Dependent Claim
40 words
A cathode-ray tube (10) as defined in Claim 1, characterized in that said shadow mask (36) is connected to the inside of said shadow-mask frame (30), and said magnetic shield (42) is connected to the outside of said shadow-mask frame.
Claim 6
Dependent Claim
37 words
A cathode-ray tube (10) as defined in Claim 3 or Claim 4, characterized in that the overlapping distance along the direction of said central axis (Z) comprises at least twice the thickness of said shadow-mask frame (30).
Claim 7
Dependent Claim
36 words
A cathode-ray tube (10) as defined in any one of the preceeding Claims, characterized in that the said one end (44) of said magnetic shield (42) extends substantially to the front of said shadow-mask frame (30).
Claim 8
Dependent Claim
54 words
A cathode-ray tube (10) as defined in any one of the preceeding Claims, characterized in that said shadow-mask frame (30) is rectangular shaped, and the said one end (44) of said magnetic shield (42) overlaps the edge (38) of said shadow mask (36) along the sides of said frame except in the corners thereof.
References Cited (Backward Citations)
No citation records indexed.
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