Patent US4386295A successfully refreshed from Google Patents.
US4386295A
Expired / Lapsed
US
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Ceramic luminescent device
Assignee: Panasonic Holdings Corp
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Filing: 1980-05-16
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Granted: 1983-05-31
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Expires: 2000-05-16
Abstract
Abstract A ceramic luminescent device, in which a luminescent screen of zinc sulfide layer with luminescent impurities is formed on a translucent zinc oxide sintered body, and the luminescent light emitted from said luminescent screen is derived through said zinc oxide body. The device can be constructed in a manner that said luminescent screen is excited either by an electric field or electron beam.
Inventors
- 👤 Yosuke Fujita
- 👤 Fumio Fukushima
- 👤 Yoji Fukuda
- 👤 Tsuneharu Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:30
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/01; C04B35/453; C04B41/45; C04B41/50; C04B41/5007; C04B41/5014; C04B41/80; C04B41/81; C04B41/85; H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/182; H05; H05B; H05B33/00; H05B33/12; H05B33/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A ceramic luminescent device comprising: a translucent, electrically conductive zinc oxide sintered body; a luminescent layer of zinc sulfide containing a luminescent impurity formed on said zinc oxide sintered body; and an electrode layer deposited on said luminescent layer, said electrode layer having the capability of reflecting light.
Claim 2
Dependent Claim
48 words
A ceramic luminescent device comprising: a translucent, electrically conductive zinc oxide sintered body; a luminescent layer of zinc sulfide containing a luminescent impurity formed on said zinc oxide sintered body; and an electrode layer deposited on said luminescent layer, said electrode layer having the capability of reflecting light.
Claim 3
Dependent Claim
25 words
A ceramic luminescent device as claimed in claim 1, wherein the transmittance of said zinc oxide sintered body for luminescent light is greater than 60%.
Claim 4
Dependent Claim
35 words
A ceramic luminescent device as claimed in claim 1, wherein said zinc sulfide luminescent layer contains at least one luminescent impurity selected from the group consisting of Cu, Ag, Au, Mn, Tb, Al and Cl.
Claim 5
Dependent Claim
22 words
A ceramic luminescent device as claimed in claim 1, wherein said zinc sulfide luminescent layer contains Mn and Cu as luminescent impurities.
Claim 6
Dependent Claim
31 words
A luminescent apparatus comprising a luminescent device as claimed in claim 1 and an exciting means for supplying an exciting voltage between said zinc oxide sintered body and said electrode layer.
Claim 7
Dependent Claim
35 words
A luminescent apparatus as claimed in claim 5, wherein said exciting means includes an electron beam source which irradiates said luminescent device with an electron beam from the electrode layer side of said luminescent device.
References Cited (Backward Citations)
US4035819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |