US4367016A
Expired / Lapsed
US
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Flat field lens with image splitting effect
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1980-04-14
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Granted: 1983-01-04
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Expires: 2000-04-14
Abstract
Abstract Disclosed is a flat field lens having an image splitting effect, comprising a generally planar lens of substantially transparent material having an optical axis; and a plurality of deformations of identical cross-sectional configuration formed on concentric paths about the optical axis of the transparent lens. Each of the deformations has at least two light-refracting surfaces which are symmetrical to an axis of the deformation, wherein the axis of symmetry of each deformation lying on the same concentric path has the same inclination with respect to the optical axis, and the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths varies, preferably constantly, with respect to the optical axis.
Inventors
- 👤 Joerg Willhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:17
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A flat field lens having an image splitting effect, comprising: a generally planar lens of substantially transparent material having an optical axis; and a plurality of deformations of identical cross-sectional configuration formed on concentric paths about the optical axis transparent lens, each of said deformations having at least two light-refracting surfaces which are symmetrical to an axis of the deformation, wherein the axis of symmetry of each deformation lying on the same concentric path has the same inclination with respect to the optical axis and the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths varies with respect to the optical axis.
Claim 2
Dependent Claim
107 words
A flat field lens having an image splitting effect, comprising: a generally planar lens of substantially transparent material having an optical axis; and a plurality of deformations of identical cross-sectional configuration formed on concentric paths about the optical axis transparent lens, each of said deformations having at least two light-refracting surfaces which are symmetrical to an axis of the deformation, wherein the axis of symmetry of each deformation lying on the same concentric path has the same inclination with respect to the optical axis and the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths varies with respect to the optical axis.
Claim 3
Dependent Claim
31 words
A field lens according to claim 1, wherein the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths varies constantly with respect to the optical axis.
Claim 4
Dependent Claim
14 words
A field lens according to claim 1 or 2, wherein the deformations comprise elevations.
Claim 5
Dependent Claim
14 words
A field lens according to claim 1 or 2, wherein the deformations comprise depressions.
Claim 6
Dependent Claim
30 words
A field lens according to claim 1 or 2, wherein the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths increases in the radial direction.
Claim 7
Dependent Claim
30 words
A field lens according to claim 1 or 2, wherein the inclination of the axes of symmetry of deformations located on radially adjacent concentric paths decreases in the radial direction.
Claim 8
Dependent Claim
38 words
A field lens according to claim 1, wherein it comprises the form of a Fresnel echelon lens, comprising concentric steps each having an effective flank, wherein said deformations are located on the effective flank of the individual steps.
Claim 9
Dependent Claim
18 words
A field lens according to claim 7, wherein each of said deformations comprises the form of a prism.
Claim 10
Dependent Claim
19 words
A field lens according to claim 7, wherein each of said deformations comprises the form of a cylindrical lens.
Claim 11
Dependent Claim
26 words
A field lens according to claim 1 or 2, wherein each path comprises a plurality of successively placed deformations, each having the form of a pyramid.
Claim 12
Dependent Claim
26 words
A field lens according to claim 1 or 2, wherein each path comprises a plurality of successively placed deformations, each having the form of a cone.
Claim 13
Dependent Claim
27 words
A field lens according to claim 1 or 2, wherein each path comprises a plurality of successively placed deformations, each having the form of a spherical cap.
Claim 14
Dependent Claim
57 words
A field lens according to claim 7, wherein the axis of symmetry of each deformation is perpendicular to the effective flank of each concentric step, which represents the chord of the individual circular arc sections of an imaginary convex lens surface, whereby the axis of symmetry of each deformation is perpendicular to the imaginary convex lens surface.
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) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |