US4871219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide spectral band infrared refractive lens
Assignee: Raytheon Co
•
Filing: 1988-07-12
•
Granted: 1989-10-03
•
Expires: 2008-07-12
Abstract
Abstract The disclosure relates to a wide spectral band objective refractive apochromatic lens system capable of operation with infrared light in the 3 to 12 micron range with good color correction simultaneously. The lens system includes three lenses, the first lens being positive and formed of Texas Instruments 1173 glass and the second and third lenses being negative and formed of germanium and zinc sulfide respectively. The germanium lens has a power approximately 0.44 that of the 1173 glass lens and the zinc sulfide lens has a power approximately 0.22 that of the 1173 glass lens.
Inventors
- 👤 Erwin E. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:06
CPC Classifications
G; G02; G02B; G02B1/00; G02B13/00; G02B13/14; G02B13/146
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
64 words
A wide spectral band infrared refractive lens system comprising: a first lens comprising a chalcogenide glass; a second lens comprising germanium; and a third lens comprising zinc sulfide; said first lens having a predetermined refractive index and dispersion to maintain said lens system simultaneously essentially focused to a common image plane at all of the frequencies in the range of 3 to 13 microns.
Claim 2
Dependent Claim
64 words
A wide spectral band infrared refractive lens system comprising: a first lens comprising a chalcogenide glass; a second lens comprising germanium; and a third lens comprising zinc sulfide; said first lens having a predetermined refractive index and dispersion to maintain said lens system simultaneously essentially focused to a common image plane at all of the frequencies in the range of 3 to 13 microns.
Claim 3
Dependent Claim
23 words
The lens system of claim 1 wherein said first lens is a positive lens and said second and third lenses are negative lenses.
Claim 4
Dependent Claim
44 words
The lens system of claim 2 wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 5
Dependent Claim
44 words
The lens system of claim 1 wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 6
Dependent Claim
16 words
The lens system of claim 1 wherein the first lens has a refractive index of 2.6047.
Claim 7
Dependent Claim
31 words
The lens system of claim 1 wherein the second lens is positioned between the first and third lenses and the first lens is positioned to receive radiation before the second lens.
Claim 8
Dependent Claim
77 words
A wide spectral band infrared afocal lens system comprising: a first lens comprising a chalcogenide glass; a second lens comprising germanium; and a third lens comprising zinc sulfide; and a collimating lens system for collimating the output of said third lens; said first lens having a predetermined refractive index and dispersion to maintain said lens system simultaneously essentially focused to a common image plane at all of the frequencies in the range of 3 to 13 microns.
Claim 9
Dependent Claim
77 words
A wide spectral band infrared afocal lens system comprising: a first lens comprising a chalcogenide glass; a second lens comprising germanium; and a third lens comprising zinc sulfide; and a collimating lens system for collimating the output of said third lens; said first lens having a predetermined refractive index and dispersion to maintain said lens system simultaneously essentially focused to a common image plane at all of the frequencies in the range of 3 to 13 microns.
Claim 10
Dependent Claim
23 words
The lens system of claim 7 wherein said first lens is a positive lens and said second and third lenses are negative lenses.
Claim 11
Dependent Claim
44 words
The lens system of claim 8 wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 12
Dependent Claim
29 words
The lens system of claim 8, wherein said collimating lens system includes a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.
Claim 13
Dependent Claim
28 words
The lens system of claim 10 wherein said fourth, sixth and seventh lenses are formed from said chalcogenide glass and said fifth lens is formed from zinc sulfide.
Claim 14
Dependent Claim
44 words
The lens system of claim 7, wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 15
Dependent Claim
29 words
The lens system of claim 7 wherein said collimating lens system includes a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.
Claim 16
Dependent Claim
28 words
The lens system of claim 13, wherein said fourth, sixth and seventh lenses are formed from said chalcogenide glass and said fifth lens is formed from zinc sulfide.
Claim 17
Dependent Claim
50 words
A wide spectral band infrared refractive lens system consisting essentially of, in combination, (a) a first lens formed from chalcogenide glass having a refractive index of about 2.6047 and a dispersion of about 167, (b) a second lens formed from germanium, and (c) a third lens formed from zinc sulfide.
Claim 18
Dependent Claim
50 words
A wide spectral band infrared refractive lens system consisting essentially of, in combination, (a) a first lens formed from chalcogenide glass having a refractive index of about 2.6047 and a dispersion of about 167, (b) a second lens formed from germanium, and (c) a third lens formed from zinc sulfide.
Claim 19
Dependent Claim
21 words
The lens system of claim 15 wherein the spectral range is from 3 to 13 microns with a common focus plane.
Claim 20
Dependent Claim
23 words
The lens system of claim 16 wherein said first lens is a positive lens and said second and third lenses are negative lenses.
Claim 21
Dependent Claim
44 words
The lens system of claim 17 wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 22
Dependent Claim
44 words
The lens system of claim 16 wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 23
Dependent Claim
70 words
An afocal lens system comprising combination: (a) a wide spectral band infrared refractive lens system consisting essentially of, in combination, (b) a first lens formed from chalcogenide glass having a refractive index of about 2.6047 and a dispersion of about 167, (c) a second lens formed from germanium, (d) a third lens formed from zinc sulfide, and (e) a collimating lens system for collimating the output of said third lens.
Claim 24
Dependent Claim
70 words
An afocal lens system comprising combination: (a) a wide spectral band infrared refractive lens system consisting essentially of, in combination, (b) a first lens formed from chalcogenide glass having a refractive index of about 2.6047 and a dispersion of about 167, (c) a second lens formed from germanium, (d) a third lens formed from zinc sulfide, and (e) a collimating lens system for collimating the output of said third lens.
Claim 25
Dependent Claim
23 words
The lens system of claim 20 wherein said first lens is a positive lens and said second and third lenses are negative lenses.
Claim 26
Dependent Claim
44 words
The lens system of claim 21 wherein the power of said second lens is from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 27
Dependent Claim
29 words
The lens system of claim 22 wherein said collimating lens system includes a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.
Claim 28
Dependent Claim
28 words
The lens system of claim 23 wherein said fourth, sixth and seventh lenses are formed from said chalcogenide glass and said fifth lens is formed from zinc sulfide.
Claim 29
Dependent Claim
29 words
The lens system of claim 21 wherein said collimating lens system includes a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.
Claim 30
Dependent Claim
28 words
The lens system of claim 25 wherein said fourth, sixth and seventh lenses are formed from said chalcogenide glass and said fifth lens is formed from zinc sulfide.
Claim 31
Dependent Claim
44 words
The lens system of claim 20 wherein the power of said second lens if from about 0.40 to about 0.48 that of said first lens and the power of said third lens is from about 0.18 to about 0.26 that of said first lens.
Claim 32
Dependent Claim
29 words
The lens system of claim 27 wherein said collimating lens system includes a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.
Claim 33
Dependent Claim
28 words
The lens system of claim 28 wherein said fourth, sixth and seventh lenses are formed from said chalcogenide glass and said fifth lens is formed from zinc sulfide.
Claim 34
Dependent Claim
29 words
The lens system of claim 20 wherein said collimating lens system includes a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.
Claim 35
Dependent Claim
28 words
The lens system of claim 30 wherein said fourth, sixth and seventh lenses are formed from said chalcogenide glass and said fifth lens is formed from zinc sulfide.
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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |