US4217495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron microscope backscattered electron detectors
Assignee: Individual
•
Filing: 1979-04-04
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Granted: 1980-08-12
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Expires: 1999-04-04
Abstract
Abstract An electron microscope backscattered detector comprising an arm of scintillation material with a hole through which the electron beam passes, the hole being provided with a removable grounded liner to facilitate cleaning and prevent astigmatism problems due to electron build up.
Inventors
- 👤 Vivian N. E. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:56
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; H; H01; H01J; H01J37/00; H01J37/02; H01J37/244; H01J2237/00; H01J2237/244; H01J2237/2443; H01J2237/2445; H01J2237/24475; H01J2237/245; H01J2237/24507
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A backscattered electron detector for use in an electron microscope, said detector comprising an arm of scintillation material adapted to be coupled to a photomultiplier at one end thereof and incorporating adjacent the opposite end a transverse hole capable of passing the electron beam of said microscope therethrough, said hole having a liner of metallic material capable of being connected to an electrical connection in use.
Claim 2
Dependent Claim
66 words
A backscattered electron detector for use in an electron microscope, said detector comprising an arm of scintillation material adapted to be coupled to a photomultiplier at one end thereof and incorporating adjacent the opposite end a transverse hole capable of passing the electron beam of said microscope therethrough, said hole having a liner of metallic material capable of being connected to an electrical connection in use.
Claim 3
Dependent Claim
18 words
A backscattered electron detector as claimed in claim 1 wherein said liner is readily removable from said hole.
Claim 4
Dependent Claim
56 words
A backscattered electron detector as claimed in claim 2 wherein a bush of metallic material is provided fixed to said scintillation material within said hole, said bush being provided with a female thread and said liner being provided with a corresponding male thread so that said liner is removable by unscrewing said liner from said bush.
Claim 5
Dependent Claim
25 words
A backscattered electron detector as claimed in claim 3 wherein said bush is fixed to said scintillation material by gluing with an epoxy type resin.
Claim 6
Dependent Claim
40 words
A backscattered electron detector as claimed in claim 1 wherein said arm is provided with a metallic covering over at least the upper surface of said arm, and said electrical connection from said liner is made through said metallic covering.
Claim 7
Dependent Claim
34 words
A backscattered electron detector as claimed in claim 5 wherein said arm is generally rectangular in cross-section and said metallic covering extends over the upper surface and the sides and tip of said arm.
Claim 8
Dependent Claim
23 words
A backscattered electron detector as claimed in claim 1 wherein said scintillation material is cut away in a cone-like configuration beneath said liner.
Claim 9
Dependent Claim
22 words
A backscattered electron detector as claimed in claim 1 wherein the bore through said liner is less than 15 millimeters in diameter.
Claim 10
Dependent Claim
19 words
A backscattered electron detector as claimed in claim 8 wherein said bore is less than 10 millimeters in diameter.
Claim 11
Dependent Claim
27 words
A backscattered electron detector as claimed in claim 1 wherein the scintillation material subtends a solid angle at the specimen of between 0.8π steradian and 1.8π steradian.
Claim 12
Dependent Claim
17 words
A backscattered electron detector as claimed in claim 1 wherein said electrical connection is an earthed connection.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |