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US4390249A
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Galilean-type telescope system
Assignee: Individual
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Filing: 1980-10-16
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Granted: 1983-06-28
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Expires: 2000-10-16
Abstract
Abstract A Galilean-type telescope system comprises three components arranged successively along the optical axis thereof. The first and the second components are single positive menisci, constituting the objective of the system and separated by an air space from the third component, which is a negative concentric meniscus forming an eyepiece of the system, all three components being concave towards the eye side of the system. The third component is a lens member cemented together from two lenses having their cemented surfaces of the same shape and equal refractive indices but different dispersion, the dispersion of the lens disposed closer to said eye side being substantially less than that of the following lens. The thickness of the air space between the second and third components complies with the relationship: ##EQU1## wherein: d x --thickness of the air space, f' 1 --rear focal distance of the objective, Γ--magnification provided by the system, R x --radius of curvature of the front refractive, surface of the negative concentric meniscus.
Inventors
- 👤 Mikhail M. Rusinov
- 👤 Galina N. Judova
- 👤 Jury V. Kudryashov
- 👤 Peisakh Y. Agurok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:36
CPC Classifications
G; G02; G02B; G02B23/00; G02B9/00; G02B9/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
235 words
A Galilean-type telescope system having an object side and an eye side, comprising: first, second and third optical components arranged successively along the optical axis of said system in the direction of the travel of the light beam therethrough, said first component being a single positive meniscus, said second component being a single positive meniscus, and said third component being a negative concentric meniscus, said first and said second components constituting an objective of said telescope system and said third component being an eyepiece of said telescope system, all said three components being concave towards the eye side of said optical system, said negative concentric meniscus, representing said third component, including a lens member having cemented together two lenses with the same shape of cemented surfaces, said lenses of said third component having substantially equal refractive indices but different dispersion, the dispersion of the lens disposed closer to said eye side of said telescope system being substantially less than that of the following lens, and an air space separating said second component from said third component and whose thickness in the optical axis complies with the following relationship: ##EQU6## wherein: d x --thickness of the air space in the optical axis of said system, f' 1 --rare focal distance of said objective of said system, Γ--magnification provided by said system; R x --radius of curvature of the front refractive surface of said negative concentric meniscus.
Claim 2
Dependent Claim
235 words
A Galilean-type telescope system having an object side and an eye side, comprising: first, second and third optical components arranged successively along the optical axis of said system in the direction of the travel of the light beam therethrough, said first component being a single positive meniscus, said second component being a single positive meniscus, and said third component being a negative concentric meniscus, said first and said second components constituting an objective of said telescope system and said third component being an eyepiece of said telescope system, all said three components being concave towards the eye side of said optical system, said negative concentric meniscus, representing said third component, including a lens member having cemented together two lenses with the same shape of cemented surfaces, said lenses of said third component having substantially equal refractive indices but different dispersion, the dispersion of the lens disposed closer to said eye side of said telescope system being substantially less than that of the following lens, and an air space separating said second component from said third component and whose thickness in the optical axis complies with the following relationship: ##EQU6## wherein: d x --thickness of the air space in the optical axis of said system, f' 1 --rare focal distance of said objective of said system, Γ--magnification provided by said system; R x --radius of curvature of the front refractive surface of said negative concentric meniscus.
Claim 3
Dependent Claim
24 words
A Galilean-type telescope system as set forth in claim 1, wherein said cemented surfaces of said lenses of said negative concentric meniscus are planes.
Claim 4
Dependent Claim
42 words
A Galilean-type telescope system as set forth in claim 1, wherein said cemented surfaces of said lenses of said negative concentric meniscus are spherical and have an equal radius of curvature, and are concave towards said eye side of said optical system.
Claim 5
Dependent Claim
26 words
A Galilean-type telescope system, according to claim 1, wherein said first component has a ratio of thickness in the optical axis to diameter not exceeding 1:10.
Claim 6
Dependent Claim
23 words
A Galilean-type telescope system, according to claim 1, wherein said first and second components comprise lenses with equal refractive indices and dispersion factors.
Claim 7
Dependent Claim
34 words
A Galilean-type telescope system, according to claim 1, wherein said objective of said telescope system has a positive focal distance, and said first and second components are spaced no more than 0.1 mm apart.
Claim 8
Dependent Claim
93 words
A Galilean-type telescope system, according to claim 1, wherein in each of said first and second components the radius of a rear refractive surface is greater than that of a front refractive surface, the radius of said front refractive surface of each of said first and second components being selected so that said front refractive surface has a focal power exceeding the focal power of the respective component, and the radius of said rear refractive surface of each of said first and second components being selected so that said components provide corrective properties.
Claim 9
Dependent Claim
53 words
A Galilean-type telescope system, according to claim 1, wherein the unconcentricity of the planes of cemented surfaces of the lenses of said third component does not exceed 20%, the difference in refractive indices of the lenses of said third component does not exceed 0.05, and the difference in dispersion does not exceed 20.
References Cited (Backward Citations)
SU175270A1
Cited
US3663094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |