US3772553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary emission structure
Assignee: HP Inc
•
Filing: 1972-06-19
•
Granted: 1973-11-13
•
Expires: 1992-06-19
Abstract
Abstract A grid is coated with a dielectric material which has good secondary emission characteristics and the coated grid is mounted in a cathode ray tube along with a collector electrode. The secondary emission structure is used as an expansion lens or a storage mesh in a storage type cathode ray tube.
Inventors
- 👤 F Balint
- 👤 W Kruger
- 👤 M Russell
- 👤 L Trueb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:34
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/18; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/395
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
In a cathode ray tube including an electron gun disposed at one end of the tube for emitting an electron beam, a display screen disposed at an opposite end of the tube for receiving the electron beam, electron deflectors for deflecting the electron beam disposed adjacent the electron gun, and a post accelerator region between the electron deflectors and the display screen, an expansion lens disposed adjacent the electron deflectors at the incident end of the post accelerator region comprising: a grid having a surface facing the electron gun; a dielectric coating on said surface for enhancing secondary electron emission from said surface in response to the electron beam impinging thereon, said impingement forming charged areas on the dielectric coating; and a collector electrode disposed adjacent to and insulated from said surface for collecting secondary electrons, whereby secondary electrons from said surface are kept from being carried along with the electron beam by being collected by the collector electrode and by the charged areas on the dielectric coating.
Claim 2
Dependent Claim
168 words
In a cathode ray tube including an electron gun disposed at one end of the tube for emitting an electron beam, a display screen disposed at an opposite end of the tube for receiving the electron beam, electron deflectors for deflecting the electron beam disposed adjacent the electron gun, and a post accelerator region between the electron deflectors and the display screen, an expansion lens disposed adjacent the electron deflectors at the incident end of the post accelerator region comprising: a grid having a surface facing the electron gun; a dielectric coating on said surface for enhancing secondary electron emission from said surface in response to the electron beam impinging thereon, said impingement forming charged areas on the dielectric coating; and a collector electrode disposed adjacent to and insulated from said surface for collecting secondary electrons, whereby secondary electrons from said surface are kept from being carried along with the electron beam by being collected by the collector electrode and by the charged areas on the dielectric coating.
Claim 3
Dependent Claim
27 words
A cathode ray tube as in claim 1 wherein the dielectric coating has a unit lattice energy greater than the equivalent unit energy of the electron beam.
Claim 4
Dependent Claim
20 words
A cathode ray tube as in claim 2 wherein the dielectric coating has a lattice energy greater than 1,000 kcal/mole.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |