US3868504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular biocular eyepiece for thermal image systems
Assignee: United States Department of the Army
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Filing: 1973-09-20
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Granted: 1975-02-25
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Expires: 1993-09-20
Abstract
Abstract A biocular viewing system for thermal (far infrared) viewers is provided by matching an eyepiece developed for an image intensifier to the low intensity image produced by light emitting diodes. A simplified image intensifier with gain sacrificed provides a low cost matching unit.
Inventors
- 👤 David K Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/12; G02B25/00; G02B25/001
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A low gain image intensifier comprising: a pair of thin transparent backing plates disposed in parallel with first and second opposed surfaces spaced apart less than one millimeter; a photocathode and covering to said first surface; an electro-luminescent phosphor screen and covering to said second surface first and second thin conductive layer means attached to and covering said screen and said photocathode to reflect light and provide a barrier to ions incident thereon; a closure member sealed to the entire perimeter of each plate as the sole means of support and separation of said plates whereby only a hard vacuum is maintained between said plates; and a pair of electrodes insulated from one another attached to said first and second thin conductive layers, respectively, and sealed through said closure member.
Claim 2
Dependent Claim
130 words
A low gain image intensifier comprising: a pair of thin transparent backing plates disposed in parallel with first and second opposed surfaces spaced apart less than one millimeter; a photocathode and covering to said first surface; an electro-luminescent phosphor screen and covering to said second surface first and second thin conductive layer means attached to and covering said screen and said photocathode to reflect light and provide a barrier to ions incident thereon; a closure member sealed to the entire perimeter of each plate as the sole means of support and separation of said plates whereby only a hard vacuum is maintained between said plates; and a pair of electrodes insulated from one another attached to said first and second thin conductive layers, respectively, and sealed through said closure member.
Claim 3
Dependent Claim
15 words
An image intensifier according to claim 1 wherein said backing plates are fiber-optic face plates.
Claim 4
Dependent Claim
21 words
An image intensifier according to claim 1 wherein a d.c. potential source of approximately 8 kilovolts is connected between said electrodes.
Claim 5
Dependent Claim
22 words
An image intensifier according to claim 1 wherein: said photocathode and said screen are composed of S-20 type and P-20 type materials.
Claim 6
Dependent Claim
52 words
An image intensifier according to claim 1 further including: an adapter ring engaging the edge portion only of said intensifier, said ring having male and female threads at its respective opposite ends, whereby said intensifier can be readily interposed between the housing and eyepiece of available image intensifier and infrared viewing devices.
References Cited (Backward Citations)
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Cited
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Cited
US3184753A
Cited
US3267283A
Cited
US3491233A
Cited
US3737667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |