US5109159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray image sensor
Assignee: Hitachi High-Tech Analysis Corp
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Filing: 1990-04-16
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Granted: 1992-04-28
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Expires: 2010-04-16
Abstract
Abstract This invention relates to an X-ray image sensor formed by fitting and integrating a fiber plate equipped with a phosphor layer to and with a solid state imaging device, and to an X-ray image sensor which uses a material containing chromium (Cr) adapting to the spectral sensitivity characteristics of a silicon type solid state imaging device as the material of the phosphor layer.
Inventors
- 👤 Ryoji Hagiwara
- 👤 Hiroyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:35
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2006
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
An x-ray image sensor comprising: a phosphor screen member for converting incident x-ray radiation into light radiation; a fiber optic plate having an input side disposed to receive light radiation transmitted by said phosphor screen member and an output side for exiting light radiation propagated through said fiber optic plate; and an image sensing device optically coupled to the output side of said fiber optic plate and having a range of sensitivity, wherein said phospher screen member includes a sufficient amount of chromium to bring the center of the light emission range of said phosphor screen member near 750 nm and thus close to the center of the sensitivity range of said image sensing device.
Claim 2
Dependent Claim
115 words
An x-ray image sensor comprising: a phosphor screen member for converting incident x-ray radiation into light radiation; a fiber optic plate having an input side disposed to receive light radiation transmitted by said phosphor screen member and an output side for exiting light radiation propagated through said fiber optic plate; and an image sensing device optically coupled to the output side of said fiber optic plate and having a range of sensitivity, wherein said phospher screen member includes a sufficient amount of chromium to bring the center of the light emission range of said phosphor screen member near 750 nm and thus close to the center of the sensitivity range of said image sensing device.
Claim 3
Dependent Claim
73 words
An x-ray image sensor according to claim 1; wherein said phosphor screen member includes at least one member selected form the group consisting of GGG (Gd 3 Ga 5 O 12 ), GSGG (Gd 3 Sc 2 Ga 3 O 12 ), GSAG Gd 3 Sc 2 Al 3 O 12 ), GGAG (Gd 3 Ga 2 Al 3 O 12 ) and LLGG (La 3 Lu 2 Ga 3 O 12 ).
Claim 4
Dependent Claim
36 words
An x-ray image sensor according to claim 2; wherein said fiber optic plate has a core material that includes at least one member selected from the group consisting of lead oxide, barium oxide and lanthanum oxide.
Claim 5
Dependent Claim
20 words
An x-ray image sensor according to claim 3; wherein said fiber optic plate has a core material including cerium oxide.
Claim 6
Dependent Claim
25 words
An x-ray image sensor according to claim 4; wherein said phosphor screen member has an x-ray incidence surface; and a metal film covering the surface.
Claim 7
Dependent Claim
17 words
An x-ray image sensor according to claim 5; wherein said metal film member is composed of aluminum.
Claim 8
Dependent Claim
20 words
An x-ray image sensor according to claim 6; wherein said metal film member has a thickness greater than 0.01 micron.
Claim 9
Dependent Claim
20 words
An x-ray image sensor according to claim 6; wherein said metal film member has a thickness less than 0.1 micron.
Claim 10
Dependent Claim
30 words
A x-ray image sensor according to claim 1; wherein the phosphor screen member has a surface having a grid comprised of raised portions and groove portions for improving image resolution.
Claim 11
Dependent Claim
38 words
An x-ray image sensor according to claim 1; wherein said phosphor screen member is positioned relative to said image sensing device such that an x-ray incident on said phosphor screen member is not incident on said sensing device.
Claim 12
Dependent Claim
23 words
An x-ray image sensor according to claim 1; wherein said fiber optic plate has an optical axis inclined to said phosphor screen member.
Claim 13
Dependent Claim
22 words
An x-ray image sensor according to claim 1; wherein said image sensing device has a sensitivity range centered at substantially 800 nm.
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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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |