US3899711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated multi-apertured electrode
Assignee: General Electric Co
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Filing: 1973-05-09
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Granted: 1975-08-12
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Expires: 1993-05-09
Abstract
Abstract Electron optical lenses having an array of lenslets with each lenslet of substantially identical size and shape with precise spacing and alignment are described. Methods for making these lenses include forming lenslets in lens plates having a thickness substantially less than the diameter of the lenslets and then forming a laminated structure with a support plate bonded between two lens plates to provide mechanical rigidity to the electron optical lens.
Inventors
- 👤 Charles Q Lemmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:39
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/80; H01J29/803; H01J29/02; H01J29/06; H01J29/806
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
An electron optical lens comprising: a conductive support plate having an array of apertures therein; a pair of lens plates, each having the same number of apertures therein as said support plate and in the same pattern; said support plate positioned between said lens plates and bonded thereto with said apertures in substantial alignment; the apertures in said support plate being larger than the apertures in said lens plates whereby the electron optical characteristics of said lens are determined solely by the size and shape of the apertures in said lens plates; said apertures characterized by a generally circular shape, the apertures of said lens plates having a diameter of up to 30 mils and a center to center spacing of up to 60 mils.
Claim 2
Dependent Claim
125 words
An electron optical lens comprising: a conductive support plate having an array of apertures therein; a pair of lens plates, each having the same number of apertures therein as said support plate and in the same pattern; said support plate positioned between said lens plates and bonded thereto with said apertures in substantial alignment; the apertures in said support plate being larger than the apertures in said lens plates whereby the electron optical characteristics of said lens are determined solely by the size and shape of the apertures in said lens plates; said apertures characterized by a generally circular shape, the apertures of said lens plates having a diameter of up to 30 mils and a center to center spacing of up to 60 mils.
Claim 3
Dependent Claim
26 words
The electron optical lens of claim 1 wherein the diameter of the apertures in one lens plate is greater than that in the other lens plate.
Claim 4
Dependent Claim
24 words
The electron optical lens as set forth in claim 2 wherein the lens plate having smaller apertures has apertures of up to 10 mils.
Claim 5
Dependent Claim
31 words
The electron optical lens of claim 1 wherein said lens plates have a thickness of between approximately 1 and 25 percent of the diameter of the apertures in said lens plates.
Claim 6
Dependent Claim
31 words
The electron optical lens of claim 4 wherein the thickness of said support plate is greater than that of said lens plates but less than one-half the diameter of said apertures.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |