US3611005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording cathode-ray tube having an electron penetrative window
Assignee: Panasonic Holdings Corp
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Filing: 1969-12-16
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Granted: 1971-10-05
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Expires: 1989-12-16
Abstract
Abstract There is disclosed a recording cathode-ray tube having an electron beam penetrative window which permits the electron beams of low energy level to pass it, and which has sufficient physical strength against breakage because of a unique supporting or reinforcing means applied to the electron penetrative membrane. Such device has several other advantages which are also disclosed. There are also disclosed combinations of such device and a magnetic field, which present improved resolution to the record.
Inventors
- 👤 Yoshihiro Uno
- 👤 Haruo Maeda
- 👤 Yujiro Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:16
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/06; H01J31/065; H01J33/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A recording cathode-ray tube for recording information on a recording medium comprising an evacuated glass envelope having a front plate with at least one orifice therein, an electron gun mounted in said envelope and directed at said orifice, an electron beam penetrative means covering said orifice and comprising a membrane through which electron beams are tranSmitted sealingly closing said orifice to separate the vacuum from atmosphere and supporting structure means having a plurality of small holes at least in the portion spanning said orifice, said recording medium being spaced from said supporting structure by a gap no greater than the length d determined by the formula d 21(R-r)/ r where l is the depth of the holes; R is half of the center distance of adjacent said holes in said supporting structure means; and r is the radius of said holes in said supporting structure means.
Claim 2
Dependent Claim
146 words
A recording cathode-ray tube for recording information on a recording medium comprising an evacuated glass envelope having a front plate with at least one orifice therein, an electron gun mounted in said envelope and directed at said orifice, an electron beam penetrative means covering said orifice and comprising a membrane through which electron beams are tranSmitted sealingly closing said orifice to separate the vacuum from atmosphere and supporting structure means having a plurality of small holes at least in the portion spanning said orifice, said recording medium being spaced from said supporting structure by a gap no greater than the length d determined by the formula d 21(R-r)/ r where l is the depth of the holes; R is half of the center distance of adjacent said holes in said supporting structure means; and r is the radius of said holes in said supporting structure means.
Claim 3
Dependent Claim
40 words
A recording cathode-ray tube according to claim 1 in which said supporting structure means is selected from the group consisting of holed plates, mesh, lattice, and slotted plates, said membrane being mounted on the vacuum side of said supporting structure.
Claim 4
Dependent Claim
28 words
A recording cathode-ray tube according to claim 1 further comprising magnetic field means including magnetic lens means for converging electron beams emerging from said electron beam penetrative means.
Claim 5
Dependent Claim
38 words
A recording cathode-ray tube according to claim 1 further comprising means forming a substantially parallel magnetic field to converge the electron beams emerging from said electron beam penetrative means, said recording medium being placed in said magnetic field.
Claim 6
Dependent Claim
46 words
A recording cathode-ray tube according to claim 1 in which said membrane is mounted on the atmospheric side of said supporting structure, magnetic field means adjacent said membrane and adapted to cause said electron beams to converge as they pass through said membrane into the atmosphere.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |