US4245159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-acting electron-optical lenses
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1978-11-21
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Granted: 1981-01-13
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Expires: 1998-11-21
Abstract
Abstract An electron-optical lens arrangement for electron beam apparatus having a static and a dynamic focussing lens system, in which the dynamic focussing lens system is situated inside the static focussing lens system.
Inventors
- 👤 Siegfried Beisswenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:09
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/10; H01J37/14; H01J37/141; H01J3/00; H01J3/14; H01J3/20; H01J3/22; H01J37/21
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
An electro-optical electromagnetic lens arrangement for controlling and altering the focus of an electron beam comprising an electromagnetic static focussing lens system, an electromagnetic dynamic focussing lens system situated within the static lens system, and a screen incorporated between the dynamic and static lens systems so that the flux generated by the static lens system does not traverse the dynamic lens system, and the flux generated by the dynamic lens system does not traverse the static lens system.
Claim 2
Dependent Claim
78 words
An electro-optical electromagnetic lens arrangement for controlling and altering the focus of an electron beam comprising an electromagnetic static focussing lens system, an electromagnetic dynamic focussing lens system situated within the static lens system, and a screen incorporated between the dynamic and static lens systems so that the flux generated by the static lens system does not traverse the dynamic lens system, and the flux generated by the dynamic lens system does not traverse the static lens system.
Claim 3
Dependent Claim
24 words
An electron-optical lens arrangement according to claim 1, wherein said dynamic focussing lens system is arranged substantially centrally of said static focussing lens system.
Claim 4
Dependent Claim
27 words
A lens arrangement according to claim 1, wherein said dynamic focussing lens system is arranged at the axial and radial centres of the static focussing lens system.
Claim 5
Dependent Claim
16 words
A lens system according to claim 1, wherein said dynamic lens system comprises an annular coil.
Claim 6
Dependent Claim
16 words
A lens arrangement according to claim 1, wherein said screen is composed of a high-frequency ferrite.
Claim 7
Dependent Claim
17 words
A lens arrangement according to claim 1, wherein said screen is composed of a highly permeable material.
Claim 8
Dependent Claim
20 words
A lens arrangement according to claim 6, wherein said screen is an annular body which surrounds said dynamic lens arrangement.
Claim 9
Dependent Claim
27 words
A lens arrangement according to claim 7, wherein said annular body is of U-shaped cross-section and carries the coil of said dynamic lens system in its interior.
Claim 10
Dependent Claim
17 words
A lens arrangement according to claim 6 wherein said screen is bonded to said dynamic coil system.
Claim 11
Dependent Claim
22 words
A lens arrangement according to claim 6, wherein said dynamic coil system is encapsulated within said screen which constitutes a mold therefor.
Claim 12
Dependent Claim
20 words
A lenses arrangement according to claim 6, wherein said screen is made from an electrically conductive high resistance casting material.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |