Patent US4550973A successfully refreshed from Google Patents.
US4550973A
Expired / Lapsed
US
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Achromatic holographic optical system
Assignee: Goodrich Corp
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Filing: 1983-03-14
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Granted: 1985-11-05
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Expires: 2003-03-14
Abstract
Abstract An achromatic imaging system employs a diffractive hologram as the primary element. A conventional achromatic optical element, comprising either a refractive lens or mirror, is positioned between the primary element and a second holographic optical element. The holographic and conventional elements combine to form an imaging system characterized by high resolution and light weight.
Inventors
- 👤 Robert E. Hufnagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:01
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/4205; G02B27/4211; G02B27/0025; G02B27/0037; G02B5/00; G02B5/32
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
105 words
An optical imaging system achromatic over a wide band comprising: a first diffractive optical element, said first element comprising a hologram, said first element comprising the system primary element, said first element having a comparatively large aperture and a focal length 1/φ 1 ; an optical axis defined by a line bisecting and perpendicular to said first diffractive optical element; a second diffractive optical element, said second element comprising a hologram, said second element being spacially displaced from said first element; and a third optical element positioned intermediate said first and second elements in the direction of travel of light, said third element being achromatic.
Claim 2
Dependent Claim
105 words
An optical imaging system achromatic over a wide band comprising: a first diffractive optical element, said first element comprising a hologram, said first element comprising the system primary element, said first element having a comparatively large aperture and a focal length 1/φ 1 ; an optical axis defined by a line bisecting and perpendicular to said first diffractive optical element; a second diffractive optical element, said second element comprising a hologram, said second element being spacially displaced from said first element; and a third optical element positioned intermediate said first and second elements in the direction of travel of light, said third element being achromatic.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein said third optical element is refractive.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 wherein said first optical element functions as a lens and said third element is spaced from said first element by said focal length 1/φ 1 .
Claim 5
Dependent Claim
20 words
The apparatus of claim 3 wherein said third element is a refractive lens having a focal length 1/φ 2 .
Claim 6
Dependent Claim
14 words
The apparatus of claim 1 wherein said system is symmetric about said optical axis.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein said system is non-symmetric with respect to said optical axis.
Claim 8
Dependent Claim
29 words
The appartus of claim 1 further comprising: a fourth optical element, said fourth element receiving an image from said second element and focusing said image at a focal plane.
Claim 9
Dependent Claim
14 words
The apparatus of claim 7 wherein said system is symmetrical about said optical axis.
Claim 10
Dependent Claim
14 words
The apparatus of claim 8 wherein said third and fourth elements are refractive lenses.
Claim 11
Dependent Claim
15 words
The apparatus of claim 7 wherein said system is non-symmetric relative to said optical axis.
Claim 12
Dependent Claim
19 words
The apparatus of claim 9 wherein said first and second elements are thin-lens equivalent holographic elements comprising zone plates.
Claim 13
Dependent Claim
17 words
The apparatus of claim 1 wherein said first and second optical elements are thin-lens equivalent holographic elements.
Claim 14
Dependent Claim
57 words
The apparatus of claim 12 wherein said third optical element is a refractive lens having a focal length 1/φ 2 , said third element being spaced from said first element by a distance equal to 1/φ 1 , and wherein said second element is spaced from said third element by a distance equal to 1/φ 2 .
Claim 15
Dependent Claim
29 words
The appartus of claim 13 further comprising: a fourth optical element, said fourth element receiving an image from said second element and focusing said image at a focal plane.
Claim 16
Dependent Claim
13 words
The apparatus of claim 14 wherein said fourth element is a refractive lens.
Claim 17
Dependent Claim
15 words
The apparatus of claim 15 wherein said system is non-symmetric relative to said optical axis.
Claim 18
Dependent Claim
15 words
The apparatus of claim 14 wherein said system is non-symmetric relative to said optical axis.
Claim 19
Dependent Claim
12 words
The apparatus of claim 16 wherein said holographic elements comprise zone plates.
Claim 20
Dependent Claim
27 words
The apparatus of claim 1 wherein the power and focal length of the optical elements are selected such that the system has no color for paraxial rays.
Claim 21
Dependent Claim
61 words
The apparatus of claim 19 wherein the following equations are satisfied: ##EQU5## wherein f 3 is the focal length of the third element, L 1 is the distance between the first and third elements, L 2 is the distance between the second and third elements and φ 1 and φ 2 are respectively the powers of the first and second elements.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |