Patent US3638231A successfully refreshed from Google Patents.
US3638231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for recording with electron rays
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1969-05-26
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Granted: 1972-01-25
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Expires: 1989-05-26
Abstract
Abstract A device is disclosed for recording image elements, by exposing recording material, at constant current density with the aid of a focused electron beam provided with means before the last focusing device for varying the shape and/or size, in the recording plane, the cross section of the electron beam in conformity with image signals.
Inventors
- 👤 Jan B Le Pooie
- 👤 Leendert A Fontijn
- 👤 Alfred B Bok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/3002; G; G11; G11C; G11C13/00; G11C13/04; H01J37/3007; H01J37/302; H01J2237/00; H01J2237/15; H01J2237/151; H01J2237/1514; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A device for binary recording with the aid of an electron beam comprising an electron source for producing said electron beam, a recording medium, a means for focusing the central axis of said beam on said recording medium, electron optical means for shaping said beam and for exposing said recording medium with said beam, means for displacing said recording medium and said beam relatively to each other, and means for varying the cross section of said electron beam on said recording medium with respect to said central axis to form an image thereon at substantially constant current density.
Claim 2
Independent Claim
98 words
A device for binary recording with the aid of an electron beam comprising an electron source for producing said electron beam, a recording medium, a means for focusing the central axis of said beam on said recording medium, electron optical means for shaping said beam and for exposing said recording medium with said beam, means for displacing said recording medium and said beam relatively to each other, and means for varying the cross section of said electron beam on said recording medium with respect to said central axis to form an image thereon at substantially constant current density.
Claim 3
Dependent Claim
30 words
A device as claimed in claim 1 further comprising two electrostatic slit lenses located in succession in the direction of said beam from said electron source to said recording medium.
Claim 4
Dependent Claim
15 words
A device as claimed in claim 1 wherein said electron source includes a slit diaphragm.
Claim 5
Dependent Claim
18 words
A device as claimed in claim 1 further comprising a diaphragm located in front of said recording medium.
Claim 6
Dependent Claim
37 words
A device as claimed in claim 1, wherein said means for varying the cross section of the beam comprises a biprism located to intersect said beam and a modulator for controlling said biprism to deflect said beam.
Claim 7
Dependent Claim
44 words
A device as claimed in claim 5, wherein said means for varying furthermore includes in succession from said electron source to said recording image a mask located in the image plane of said means for focusing, a second biprism, and a second focusing means.
Claim 8
Dependent Claim
36 words
A device as claimed in claim 5, wherein said biprism is an electrostatic prism in the form of a cylindrical condenser with an inner conductor, and said modulator modulates the voltage differential across said inner conductor.
Claim 9
Dependent Claim
29 words
A device as claimed in claim 1 further comprising two quadrupole lenses located in succession in the direction of said beam from said electron source to said recording medium.
Claim 10
Dependent Claim
35 words
A device as claimed in claim 8, wherein said quadrupole lenses are magnetic lenses and further comprising means for rotating and axially displacing said quadrupole lenses with respect to the central axis of said beam.
Claim 11
Dependent Claim
22 words
A device as claimed in claim 8 further comprising a diaphragm located in the principal plane of one of said quadrupole lenses.
Claim 12
Dependent Claim
69 words
A device as claimed in claim 1, wherein said means for varying the cross section of said beam are located between said electron source and said means for focusing and comprise in succession from said electron source to said recording medium a first diaphragm, a deflector, a second focusing means and a second diaphragm In alignment with said first diaphragm in the image plane of said second focusing means.
Claim 13
Dependent Claim
15 words
A device as claimed in claim 11, wherein the diaphragms are segments of a circle.
Claim 14
Dependent Claim
12 words
A device as claimed in claim 11, wherein the diaphragms are gauzes.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |