Patent US4209705A successfully refreshed from Google Patents.
US4209705A
Expired / Lapsed
US
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Image intensifier whose input screen phosphor layer is divided into light guiding mosaic blocks by metal protrusions
Assignee: Toshiba Corp
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Filing: 1978-03-10
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Granted: 1980-06-24
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Expires: 1998-03-10
Abstract
Abstract An image intensifier having a CsI phosphor input screen. The input screen comprises a substrate of aluminum, a plurality of small mosaic blocks secured on the substrate, a plurality of grooves intervening between adjacent blocks, a plurality of metallic protrusions formed on the grooves, a plurality of phosphor blocks grown on the mosaic blocks and optically isolated from each other by the protrusions and a photocathode deposited on the phosphor blocks. The metallic protrusions cause a phosphor layer when deposited on the mosaic blocks to divide without cracking into the plurality of phosphor blocks. The upper surface of the divided layer is even, permitting the photocathode film to be deposited thereon.
Inventors
- 👤 Hiroshi Washida
- 👤 Tomiya Sonoda
- 👤 Yuzo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:45
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J31/00; H01J31/08; H01J31/50; H01J31/501; H01J9/00; H01J9/02; H01J9/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
176 words
An image intensifier comprising an input screen for converting a radiation image into an electron image; an electro-optical system for accelerating and focusing the electron image and an output screen for converting the accelerated and focused electron image into a visible image, wherein the input screen comprises: a substrate; an insulator layer formed on one surface of the substrate and having a plurality of grooves dividing the insulator layer into a plurality of mosaic blocks; a phosphor layer deposited on the insulator layer, the upper surface of the phosphor layer being even; a plurality of protruding dividing members disposed at the bottoms of the grooves in the insulator layer for causing the phosphor layer when deposited on the insulator layer to divide without cracking into a plurality of phosphor blocks corresponding to the mosaic blocks and extending substantially perpendicular to the one surface of the substrate, light generated in one phosphor block being scattered only within the one phosphor block and not travelling to the other phosphor blocks; and a photocathode deposited on the phosphor layer.
Claim 2
Dependent Claim
176 words
An image intensifier comprising an input screen for converting a radiation image into an electron image; an electro-optical system for accelerating and focusing the electron image and an output screen for converting the accelerated and focused electron image into a visible image, wherein the input screen comprises: a substrate; an insulator layer formed on one surface of the substrate and having a plurality of grooves dividing the insulator layer into a plurality of mosaic blocks; a phosphor layer deposited on the insulator layer, the upper surface of the phosphor layer being even; a plurality of protruding dividing members disposed at the bottoms of the grooves in the insulator layer for causing the phosphor layer when deposited on the insulator layer to divide without cracking into a plurality of phosphor blocks corresponding to the mosaic blocks and extending substantially perpendicular to the one surface of the substrate, light generated in one phosphor block being scattered only within the one phosphor block and not travelling to the other phosphor blocks; and a photocathode deposited on the phosphor layer.
Claim 3
Dependent Claim
15 words
An image intensifier according to claim 1, wherein the dividing members are elongated metal protrusions.
Claim 4
Dependent Claim
15 words
An image intensifier according to claim 1, wherein the substrate is of electrically conductive material.
Claim 5
Dependent Claim
16 words
An image intensifier according to claim 1 or 3, wherein the electrically conductive material is aluminum.
Claim 6
Dependent Claim
27 words
An image intensifier according to claim 1, 2 or 3, wherein the dividing members are at least partially protruded beyond the upper surface of the mosaic blocks.
Claim 7
Dependent Claim
25 words
An image intensifier according to claim 1, wherein a metallic film is deposited on the upper surfaces of the mosaic blocks and the dividing members.
Claim 8
Dependent Claim
27 words
An image intensifier according to claim 1, 2 or 3, wherein the dividing members are deposited on the bottoms of the grooves by means of electrochemical method.
Claim 9
Dependent Claim
21 words
An image intensifier according to claim 1, wherein the mosaic blocks are made of a material being different from the substrate.
Claim 10
Dependent Claim
18 words
An image intensifier according to claim 8, wherein the material is a metal covered by an insulating layer.
Claim 11
Dependent Claim
19 words
An image intensifier according to claim 9, wherein the metal is chromium and the insulating layer is chromium oxide.
Claim 12
Dependent Claim
14 words
An image intensifier according to claim 6, wherein the metallic film is of aluminum.
Claim 13
Dependent Claim
18 words
An image intensifier according to claim 1, 2 or 3, wherein the phosphor layer is of alkali halide.
Claim 14
Dependent Claim
15 words
An image intensifier according to claim 1, 2 or 3, wherein the radiation is X-ray.
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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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |