GB637361A - Improvements in and relating to electron microscope - Google Patents
Improvements in and relating to electron microscopeInfo
- Publication number
- GB637361A GB637361A GB3668/45A GB366845A GB637361A GB 637361 A GB637361 A GB 637361A GB 3668/45 A GB3668/45 A GB 3668/45A GB 366845 A GB366845 A GB 366845A GB 637361 A GB637361 A GB 637361A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- specimen
- tip
- feb
- electron microscope
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/27—Shadow microscopy
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Electron Sources, Ion Sources (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
637,361. Electron microscopes. BRITISH THOMSON-HOUSTON CO., Ltd. Feb. 14, 1945, No. 3668. Convention date, Feb. 18, 1944. [Class 39 (i)] An electron microscope comprises a readily removable field emission cold cathode 14, having a smoothly rounded tip which serves to support the specimen 20, and a fluorescent screen 12 between which and the cathode. an electric field is established, whereby a shadow image of the specimen is produced on the screen. The specimen may be embedded in a plastic film adhering to the cathode tip. The cathode is of tungsten and the tip may be rounded to a radius of 10<-4> cms. or less. A thin metal film for example of aluminium may be evaporated on the fluorescent screen. The specimen may be supported directly on the cathode tip, the field being applied to the cathode in negative pulses of short duration for producing the shadow image and in positive pulses of sufficient duration to permit discharging of the specimen to remove electrons collected during the negative pulses.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US522875A US2422041A (en) | 1944-02-18 | 1944-02-18 | Electron microscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB637361A true GB637361A (en) | 1950-05-17 |
Family
ID=24082724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3668/45A Expired GB637361A (en) | 1944-02-18 | 1945-02-14 | Improvements in and relating to electron microscope |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2422041A (en) |
| BE (1) | BE479996A (en) |
| FR (1) | FR977856A (en) |
| GB (1) | GB637361A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2813991A (en) * | 1952-11-05 | 1957-11-19 | Gen Electric | Electron emitting electrode |
| US5654548A (en) * | 1992-08-06 | 1997-08-05 | International Business Machines Corporation | Source for intense coherent electron pulses |
| US5376792A (en) * | 1993-04-26 | 1994-12-27 | Rj Lee Group, Inc. | Scanning electron microscope |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2249453A (en) * | 1938-12-02 | 1941-07-15 | Gen Electric | Electron microscope |
| CH219289A (en) * | 1939-07-22 | 1942-01-31 | Fides Gmbh | Electron microscope. |
| CA432875A (en) * | 1939-07-29 | 1946-01-29 | G. Ramberg Edward | Electron microscope |
| US2363359A (en) * | 1941-05-01 | 1944-11-21 | Gen Electric | Electron microscope |
-
0
- BE BE479996D patent/BE479996A/xx unknown
-
1944
- 1944-02-18 US US522875A patent/US2422041A/en not_active Expired - Lifetime
-
1945
- 1945-02-14 GB GB3668/45A patent/GB637361A/en not_active Expired
-
1947
- 1947-12-22 FR FR977856D patent/FR977856A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR977856A (en) | 1951-04-06 |
| US2422041A (en) | 1947-06-10 |
| BE479996A (en) |
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