US3597049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extreme wide angle lens system
Assignee: MINALTA CAMERA KK
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Filing: 1969-03-25
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Granted: 1971-08-03
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Expires: 1989-03-25
Abstract
Abstract A wide-angle lens system having twelve elements, a focal length of 1.0, a focal aperture of 1:2.8, and a field angle of 180*, and wherein the radii of curvature of the refracting surfaces, the axial separations between consecutive refracting surfaces, the refractive indices of the individual lens elements, and the Abbe numbers for each of the lens elements are specified to correct lateral chromatic aberration.
Inventors
- 👤 Toshinobu Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:07
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A wide angle lens system having a focal length of 1.0, a focal aperture of 1:2.8, a field angle of 180*, and 12 elements successively mounted from the object side, comprising; first and second lenses of the divergent meniscus type each having a convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the divergent meniscus type having its convex surface facing the object, a sixth lens of the convergent type, a seventh element is a filter, eighth and ninth lens elements formed as a doublet lens, said eighth lens is of the convergent meniscus type, said ninth lens is of the divergent meniscus type, said eighth and ninth lens each having a convex surface facing the image, tenth and eleventh lenses formed as a convergent doublet lens, said tenth lens is a divergent lens and said eleventh lens is a biconvex lens, a twelfth lens of the biconvex type, and wherein the indicated lens elements have the following characteristics,
Claim 2
Dependent Claim
173 words
A wide angle lens system having a focal length of 1.0, a focal aperture of 1:2.8, a field angle of 180*, and 12 elements successively mounted from the object side, comprising; first and second lenses of the divergent meniscus type each having a convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the divergent meniscus type having its convex surface facing the object, a sixth lens of the convergent type, a seventh element is a filter, eighth and ninth lens elements formed as a doublet lens, said eighth lens is of the convergent meniscus type, said ninth lens is of the divergent meniscus type, said eighth and ninth lens each having a convex surface facing the image, tenth and eleventh lenses formed as a convergent doublet lens, said tenth lens is a divergent lens and said eleventh lens is a biconvex lens, a twelfth lens of the biconvex type, and wherein the indicated lens elements have the following characteristics,
Claim 3
Dependent Claim
173 words
A wide angle lens system having a focal length of 1.0, a focal aperture of 1:2.8, a field angle of 180*, and 12 elements successively mounted from the object side, comprising; first and second lenses of the divergent meniscus type each having a convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the divergent meniscus type having its convex surface facing the object, a sixth lens of the convergent type, a seventh element is a filter, eighth and ninth lens elements formed as a doublet lens, said eighth lens is of the convergent meniscus type, said ninth lens is of the divergent meniscus type, said eighth and ninth lens each having a convex surface facing the image, tenth and eleventh lenses formed as a convergent doublet lens, said tenth lens is a divergent lens and said eleventh lens is a biconvex lens, a twelfth lens of the biconvex type, and wherein the indicated lens elements have the following characteristics,
Claim 4
Dependent Claim
173 words
A wide angle lens system having a focal length of 1.0, a focal aperture of 1:2.8, a field angle of 180*, and 12 elements successively mounted from the object side, comprising; first and second lenses of the divergent meniscus type each having a convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the divergent meniscus type having its convex surface facing the object, a sixth lens of the convergent type, a seventh element is a filter, eighth and ninth lens elements formed as a doublet lens, said eighth lens is of the convergent meniscus type, said ninth lens is of the divergent meniscus type, said eighth and ninth lens each having a convex surface facing the image, tenth and eleventh lenses formed as a convergent doublet lens, said tenth lens is a divergent lens and said eleventh lens is a biconvex lens, a twelfth lens of the biconvex type, and wherein the indicated lens elements have the following characteristics,
Claim 5
Dependent Claim
174 words
A wide angle lens system having a focal length of 1.0, a focal aperture of 1:2.8, a field angle of 180* , and 12 elements successively mounted from the object side, comprising; first and second lenses of the divergent meniscus type each having a convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the divergent meniscus type having its convex surface facing the object, a sixth lens of the convergent type, a seventh element is a filter, eighth and ninth lens elements formed as a doublet lens, said eighth lens Is of the convergent meniscus type, said ninth lens is of the divergent meniscus type, said eighth and ninth lens each having a convex surface facing the image, tenth and eleventh lenses formed as a convergent doublet lens, said tenth lens is a divergent lens and said eleventh lens is a biconvex lens, a twelfth lens of the biconvex type, and wherein the indicated lens elements have the following characteristics,
Claim 6
Dependent Claim
174 words
A wide angle lens system having a focal length of 1.0, a focal aperture of 1:2.8, a field angle of 180* , and 12 elements successively mounted from the object side, comprising; first and second lenses of the divergent meniscus type each having a convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the divergent meniscus type having its convex surface facing the object, a sixth lens of the convergent type, a seventh element is a filter, eighth and ninth lens elements formed as a doublet lens, said eighth lens Is of the convergent meniscus type, said ninth lens is of the divergent meniscus type, said eighth and ninth lens each having a convex surface facing the image, tenth and eleventh lenses formed as a convergent doublet lens, said tenth lens is a divergent lens and said eleventh lens is a biconvex lens, a twelfth lens of the biconvex type, and wherein the indicated lens elements have the following characteristics,
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |