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US4366413A
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Secondary electron multiplication target
Assignee: Toshiba Corp
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Filing: 1980-10-16
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Granted: 1982-12-28
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Expires: 2000-10-16
Abstract
Abstract A secondary electron multiplication target includes first and second porous layers laminated on a signal electrode. The first porous layer is formed of MgF 2 which, having a high secondary electron emitting ratio and a dielectric constant of 6 or less, produces a great number of secondary electrons in response to photoelectrons incident thereupon across the signal electrode. The second porous layer is formed of carbon which has a low secondary electron emitting ratio and hence a high crossover potential, as well as a dielectric constant of 6 or less.
Inventors
- 👤 Hiroshi Washida
- 👤 Kensaku Yano
- 👤 Yoshio Yamaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:18
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/41; H01J29/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A secondary electron multiplication target for a camera tube, comprising: platelike signal electrode means formed of a conductive material, for removing secondary electrons to form a camera tube output signal; a first porous layer consisting essentially of MgF 2 deposited on one side of said signal electrode for emitting secondary electrons in response to photoelectrons transmitted thereto through said signal electrode; and a second porous layer formed of carbon deposited on said first porous layer on its opposite side from said signal electrode and having a lower secondary electron emitting ratio than that of said first porous layer and a dielectric constant of 6 or less.
Claim 2
Dependent Claim
106 words
A secondary electron multiplication target for a camera tube, comprising: platelike signal electrode means formed of a conductive material, for removing secondary electrons to form a camera tube output signal; a first porous layer consisting essentially of MgF 2 deposited on one side of said signal electrode for emitting secondary electrons in response to photoelectrons transmitted thereto through said signal electrode; and a second porous layer formed of carbon deposited on said first porous layer on its opposite side from said signal electrode and having a lower secondary electron emitting ratio than that of said first porous layer and a dielectric constant of 6 or less.
Claim 3
Dependent Claim
22 words
A secondary electron multiplication target according to claim 1 wherein said signal electrode is formed on a member for supporting said target.
Claim 4
Dependent Claim
40 words
A secondary electron multiplication target according to claim 2, wherein said member includes a metal ring, a metal mesh stretched across said metal ring, and a conductive thin film covering said metal mesh and having said signal electrode formed thereon.
Claim 5
Dependent Claim
49 words
A secondary electron multiplication target according to claim 1, wherein said first and second porous layers are laminated on said signal electrode, and a conductive metal layer is formed on one portion at least of the peripheral region of target, said region being not scanned by the electron beam.
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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |