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US4331390A Expired / Lapsed US ⏱️ 0.0 years remaining

Monocentric optical systems

Assignee: SVG LITHOGRAPHY Inc A CORP OF
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Filing: 1979-10-09
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Granted: 1982-05-25
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Expires: 1999-10-09
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Abstract

Abstract The systems comprise a transmissive shell and a mirror. The surfaces of the shell and the mirror are monocentric; that is, spherical and have the same center of curvature. Both the object and image planes are located in front of and spaced away from the transmissive shell. Single optical element systems comprise a transmissive shell with the mirror and the back surface of the shell being coincidence. These elements may be used as laser beam focusers, beam divergers and collimators. Unit relay systems for use in super accurate microcircuit printing are disclosed. Parameters are given for a monochromatic diffraction limited f/2 system in the ultraviolet. A single element monocentric catadiotric system is disclosed, which is corrected for 3rd and 5th order spherical aberration and all field aberrations except Petzval curvature. A two-element version can cover very wide fields of view with good performance at speeds as fast as f/0.6. More complicated designs are also discussed with correction for chromatic aberration and chromatic variation of aberrations. An unobscured 30°×120° strip field design and an infra-red system are also disclosed.

Inventors

  • 👤 David R. Shafer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 22:52
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0856; G02B17/0884

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 55 words
An optical system, comprising: a concave mirror, a convex mirror, a transmission shell disposed between said mirrors so that a beam of light entering said optical system traverses said transmissive shell at least four times before leaving said optical system, the surfaces of said mirrors and said transmissive shell having the same center of curvature.
Claim 2
Dependent Claim 55 words
An optical system, comprising: a concave mirror, a convex mirror, a transmission shell disposed between said mirrors so that a beam of light entering said optical system traverses said transmissive shell at least four times before leaving said optical system, the surfaces of said mirrors and said transmissive shell having the same center of curvature.
Claim 3
Dependent Claim 43 words
The optical system defined in claim 1 wherein said transmissive shell has a buried surface therein dividing it into two elements, one of positive and one of negative power, the element of positive power having higher dispersion than the element of negative power.
Claim 4
Dependent Claim 22 words
The optical system defined in claim 2 wherein said elements of negative and positive power have substantially the same index of refraction.
Claim 5
Dependent Claim 13 words
The optical system defined in claim 1 wherein said shell is fused silica.
Claim 6
Dependent Claim 35 words
The optical system defined in claim 1 and: (G) an object and an image, both in the plane of the center of curvature, said object and image being spaced away from the center of curvature.
Claim 7
Dependent Claim 97 words
The optical system defined in claim 1 wherein said shell has an index of 1.5000, the radius of the front surface of said shell is -2.5000, the radius of the back surface thereof is -3,4665, the thickness thereof 0.9665, the space between said back surface and said mirror is 2.2446, the radius of said mirror is -5.711, the radius of the convex mirror at the image is -2.3697, the space between said first surface and said convex mirror is -0.1303, and the object and image are spaced laterally from the center of curvature from 1.78 to 2.10.
Claim 8
Dependent Claim 21 words
The optical system defined in claim 1 wherein said shell is divided into at least two elements having identical facing surfaces.

References Cited (Backward Citations)

US2571657A Cited
US2785604A Cited
DE1113637B Cited
US3326621A Cited
US3494688A Cited
US3748015A Cited
US3748020A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-05-24 1985-11-23 1986-05-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-05-24 1989-11-23 1990-05-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-05-24 1993-11-23 1994-05-25 $7700.00 Window Closed / Lapsed

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