US5079423A
Expired / Lapsed
US
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X-ray image sensor
Assignee: Hitachi High-Tech Analysis Corp
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Filing: 1990-04-16
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Granted: 1992-01-07
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Expires: 2010-04-16
Abstract
Abstract In an X-ray image sensor wherein a fiber optic plate having formed thereon a phosphor layer is fitted to and integrated with a solid state imaging device. The present invention relates to an X-ray image sensor using, as the phosphor material, a material to which neodymium (Nd) having a light emission band outside the wavelength range that is absorbed and decreased by coloring damage generated by X-rays is added.
Inventors
- 👤 Ryoji Hagiwara
- 👤 Hiroyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:25
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2006
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
121 words
An x-ray image sensor, comprising: a fiber optic plate having an x-ray incidence side and an other side; a phosphor screen member containing neodymium (Nd) disposed on the x-ray incidence side of said fiber optic plate; and a silicon type solid state image sensing device optically coupled to the other side of said fiber optic plate; wherein said phosphor screen member includes at least one member selected from 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 2
Dependent Claim
121 words
An x-ray image sensor, comprising: a fiber optic plate having an x-ray incidence side and an other side; a phosphor screen member containing neodymium (Nd) disposed on the x-ray incidence side of said fiber optic plate; and a silicon type solid state image sensing device optically coupled to the other side of said fiber optic plate; wherein said phosphor screen member includes at least one member selected from 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 3
Dependent Claim
26 words
An x-ray image sensor according to claim 1, wherein said phosphor screen member has an x-ray incidence surface; and a metal film member covering the surface.
Claim 4
Dependent Claim
17 words
An x-ray image sensor according to claim 2, wherein said metal film member is composed of aluminum.
Claim 5
Dependent Claim
20 words
An x-ray image sensor according to claim 2, wherein said metal film member has a thickness greater than 0.01 micron.
Claim 6
Dependent Claim
20 words
An x-ray image sensor according to claim 2, wherein said metal film member has a thickness less than 0.1 micron.
Claim 7
Dependent Claim
111 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 some x-ray 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 wherein said phosphor screen member includes a sufficient amount of neodymium to bring the light emission range of said phosphor screen member above the range of light absorbed by coloring damage caused by the x-rays.
Claim 8
Dependent Claim
111 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 some x-ray 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 wherein said phosphor screen member includes a sufficient amount of neodymium to bring the light emission range of said phosphor screen member above the range of light absorbed by coloring damage caused by the x-rays.
Claim 9
Dependent Claim
73 words
An x-ray image sensor according to claim 6, wherein said phosphor screen member includes at least one member selected from 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 10
Dependent Claim
36 words
An x-ray image sensor according to claim 7, 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 11
Dependent Claim
22 words
An x-ray image sensor according to claim 6, wherein said image sensing device includes a silicon type solid state image sensing device.
Claim 12
Dependent Claim
29 words
An x-ray image sensor according to claim 9, wherein the silicon type solid state image sensing device is receptive of light having a wavelength between 500 and 1100 nm.
Claim 13
Dependent Claim
26 words
An x-ray image sensor according to claim 6, wherein said phosphor screen member has an x-ray incidence surface; and a metal film member covering the surface.
Claim 14
Dependent Claim
17 words
An x-ray image sensor according to claim 11, wherein said metal film member is composed of aluminum.
Claim 15
Dependent Claim
22 words
An x-ray image sensor according to claim 6, wherein said metal film member has a thickness that is greater than 0.01 micron.
Claim 16
Dependent Claim
22 words
An x-ray image sensor according to claim 6, wherein said metal film member has a thickness that is less than 0.1 micron.
Claim 17
Dependent Claim
30 words
An x-ray image sensor according to claim 6, wherein said phosphor screen member has a surface having a grid comprised of raised portions and groove portions for improving image resolution.
Claim 18
Dependent Claim
39 words
An x-ray image sensor according to claim 6, 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 image sensing device.
Claim 19
Dependent Claim
23 words
An x-ray image sensor according to claim 6, wherein said fiber optic plate has an optical axis inclined to said phosphor screen member.
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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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |