GB697923A - Improvements relating to magnetic electron lenses - Google Patents
Improvements relating to magnetic electron lensesInfo
- Publication number
- GB697923A GB697923A GB541851A GB541851A GB697923A GB 697923 A GB697923 A GB 697923A GB 541851 A GB541851 A GB 541851A GB 541851 A GB541851 A GB 541851A GB 697923 A GB697923 A GB 697923A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bore
- pole piece
- radius
- equal
- aperture
- 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
- 241001663154 Electron Species 0.000 abstract 1
- 201000009310 astigmatism Diseases 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 abstract 1
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
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
- H01J37/10—Lenses
- H01J37/14—Lenses magnetic
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
697,923. Electron lenses. ASSOCIATED ELECTRICAL INDUSTRIES, Ltd. Feb. 26, 1952 [March 6, 1951], No. 5418/51. Class 39(i) The magnetic lens of an elec tron microscope has the pole piece nearest the electron source made with a large transverse face and an aperture which i equal to, or less than, one fifth of the radius of the bore of the other pole piece. The pole piece 8 nearer the electron source has an aperture 11 the radius of which is equal to, or less than, one fifth of that of the bore 14 in the other pole piece 13; the magnetic gap is one half to twice the radius of the bore 14 and the specimen is arrangec from the pole piece 8 a distance which may be equal to, but not greater than, twice the radius of the bore 11. The face of the pole piece 8 may be modified to compensate for astigmatism caused by irregularities in the bore of the piece 13 or it may be of parabolic or hyperbolic shape or it may carry adjustable screw plugs of magnetic material. The specimen may be introduced into the lens through the gap therebetween or through the bore 14; aperture limiting stops may be similarly introduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB541851A GB697923A (en) | 1951-03-06 | 1951-03-06 | Improvements relating to magnetic electron lenses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB541851A GB697923A (en) | 1951-03-06 | 1951-03-06 | Improvements relating to magnetic electron lenses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB697923A true GB697923A (en) | 1953-09-30 |
Family
ID=9795811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB541851A Expired GB697923A (en) | 1951-03-06 | 1951-03-06 | Improvements relating to magnetic electron lenses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB697923A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544845A (en) * | 1982-05-24 | 1985-10-01 | University de Reims Champagne Ardenne | Electron gun with a field emission cathode and a magnetic lens |
-
1951
- 1951-03-06 GB GB541851A patent/GB697923A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544845A (en) * | 1982-05-24 | 1985-10-01 | University de Reims Champagne Ardenne | Electron gun with a field emission cathode and a magnetic lens |
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