Patent US3794874A successfully refreshed from Google Patents.
US3794874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image transformer tube with movable phosphor screen
Assignee: Nv Optische Ind De Ouda Delft nl
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Filing: 1972-01-26
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Granted: 1974-02-26
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Expires: 1992-01-26
Abstract
Abstract In an diode image amplifier or image transformer tube a part of the wall of the tube between the anode and cathode window is composed of one or more interconnected metal rings which can elastically be deformed to vary the distance between anode and cathode to avoid the use of a third focusing electrode.
Inventors
- 👤 H Mulder
- 👤 J Houtkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:06
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/501
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
353 words
A diode intensifier or image transformer tube comprising an evacuated, air-tight, axially elongated housing comprising a cylindrical metallic cathode support ring having a window seat at one end thereof, a window mounted in air-tight relationship in said seat, a photo-cathode supported on the inner face of said window within said housing, a cylindrical insulating ring having one end secured in air-tight connection to the end of said cathode support ring remote from said window, a metallic cylindrical anode support ring having one end secured in airtight relation to the other end of said insulator ring, said cathode and anode support rings being conductive and connected to sources of cathode and anode potential, respectively, a third metal ring in said housing within said anode support ring, all of said rings having their axes coaxially disposed, a bellows assembly flexible in the direction of the axis of said rings interposed between said anode ring and said third ring, said bellows forming an air-tight connection with each of said anode and third rings, a single anode carried by said third ring, said anode being electrically connected to said anode support ring, a window seat on said third ring, an anode window mounted in airtight relation in said window seat of said third ring, a phosphor screen mounted on an interior face of said anode window, said screen being disposed perpendicular to the axis of said rings, a thread portion formed on said third ring and extending in the direction of the axis of said rings, a cylindrical nut means having a threaded portion engaged with said threaded portion of said third ring, said nut means including a radially extending shoulder slidingly engaged against the end portion of said anode support ring remote from said insulator ring, said nUt means shifting said third ring and, hence, said phosphor screen, in the direction of the axis of said rings responsive to rotation of said nut means relative to said third ring, whereby the spacing of said phosphor screen and cathode may be varied for purposes of improving focus, said rings and windows together defining an airtight evacuated structure.
Claim 2
Dependent Claim
353 words
A diode intensifier or image transformer tube comprising an evacuated, air-tight, axially elongated housing comprising a cylindrical metallic cathode support ring having a window seat at one end thereof, a window mounted in air-tight relationship in said seat, a photo-cathode supported on the inner face of said window within said housing, a cylindrical insulating ring having one end secured in air-tight connection to the end of said cathode support ring remote from said window, a metallic cylindrical anode support ring having one end secured in airtight relation to the other end of said insulator ring, said cathode and anode support rings being conductive and connected to sources of cathode and anode potential, respectively, a third metal ring in said housing within said anode support ring, all of said rings having their axes coaxially disposed, a bellows assembly flexible in the direction of the axis of said rings interposed between said anode ring and said third ring, said bellows forming an air-tight connection with each of said anode and third rings, a single anode carried by said third ring, said anode being electrically connected to said anode support ring, a window seat on said third ring, an anode window mounted in airtight relation in said window seat of said third ring, a phosphor screen mounted on an interior face of said anode window, said screen being disposed perpendicular to the axis of said rings, a thread portion formed on said third ring and extending in the direction of the axis of said rings, a cylindrical nut means having a threaded portion engaged with said threaded portion of said third ring, said nut means including a radially extending shoulder slidingly engaged against the end portion of said anode support ring remote from said insulator ring, said nUt means shifting said third ring and, hence, said phosphor screen, in the direction of the axis of said rings responsive to rotation of said nut means relative to said third ring, whereby the spacing of said phosphor screen and cathode may be varied for purposes of improving focus, said rings and windows together defining an airtight evacuated structure.
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |