US4267442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron multiplier device comprising microchannel plates with optical feedback suppression for image intensifier tubes
Assignee: US Philips Corp
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Filing: 1979-08-13
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Granted: 1981-05-12
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Expires: 1999-08-13
Abstract
Abstract An electron multiplier device comprises two superposed microchannel plates. At their common interface, the angle of the axis of the channels of the plates is on the order of from 25° to 30° so as to increase the number of optical reflections in the channels. The more reflections, the lower the optical feedback from the output of the multiplier. At least one of the plates comprises curved channels. The curvature of the channels is such that at the entrance and the exit of the multiplier the axis enclose a small angle of at the most 10° with the normals to the faces of the plates.
Inventors
- 👤 Jean-Claude Rosier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:28
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; H01J43/246; H01J31/00; H01J31/08; H01J31/50; H01J31/506; H01J31/507
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
An electron multiplier device of the type comprising two superposed microchannel plates exhibiting secondary electron emission, said plates each having a first end face and a second end face, the first end faces being adjacent each other, each of the microchannels defining an axis; CHARACTERIZED IN THAT: at least one plate comprises curved channels such that the angle between the axes of the channels of the two plates is at least approximately 25° at the first end faces of the plates, while the angle between the axes at the second end faces and a normal to the second end faces is at most 10°.
Claim 2
Dependent Claim
104 words
An electron multiplier device of the type comprising two superposed microchannel plates exhibiting secondary electron emission, said plates each having a first end face and a second end face, the first end faces being adjacent each other, each of the microchannels defining an axis; CHARACTERIZED IN THAT: at least one plate comprises curved channels such that the angle between the axes of the channels of the two plates is at least approximately 25° at the first end faces of the plates, while the angle between the axes at the second end faces and a normal to the second end faces is at most 10°.
Claim 3
Dependent Claim
24 words
An electron multiplier device as claimed in claim 1, CHARACTERIZED IN THAT one plate comprises curved channels and the other plate comprises straight channels.
Claim 4
Dependent Claim
17 words
An electron multiplier device as claimed in claim 1, CHARACTERIZED IN THAT both plates comprise curved channels.
Claim 5
Dependent Claim
38 words
An electron multiplier device as claimed in claim 2 or 3, CHARACTERIZED IN THAT the angle between the axes of the channels of the two plates at the first end faces of the plates is at most 30°.
Claim 6
Dependent Claim
123 words
An image intensifier tube of the type comprising a photocathode, a screen, and a microchannel plate between the photocathode and screen, CHARACTERIZED IN THAT the microchannel plate comprises two superposed microchannel plates exhibiting secondary electron emission, said plates each having a first end face and a second end face, the first end faces being adjacent each other, each of the microchannels defining an axes; and at least one plate comprises curved channels such that the angle between the axes of the channels of the two plates is at least approximately 25° at the first end faces of the plates, while the angle between the axes at the second end faces and a normal to the photocathode and the screen is at most 10°.
Claim 7
Dependent Claim
123 words
An image intensifier tube of the type comprising a photocathode, a screen, and a microchannel plate between the photocathode and screen, CHARACTERIZED IN THAT the microchannel plate comprises two superposed microchannel plates exhibiting secondary electron emission, said plates each having a first end face and a second end face, the first end faces being adjacent each other, each of the microchannels defining an axes; and at least one plate comprises curved channels such that the angle between the axes of the channels of the two plates is at least approximately 25° at the first end faces of the plates, while the angle between the axes at the second end faces and a normal to the photocathode and the screen is at most 10°.
References Cited (Backward Citations)
US3374380A
Cited
US3461332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |