US3589798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-angle lens system with corrected lateral aberration
Assignee: Minolta Co Ltd
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Filing: 1969-03-25
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Granted: 1971-06-29
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Expires: 1989-03-25
Abstract
Abstract The present invention relates to an extreme wide angle lens system having an angle of coverage of 180* which comprises eleven lens elements including an interchangeable filter. This improved extreme wide angle lens system with sufficient light intensity has a relative aperture of up to F/2.8 with a comparatively small number of compact lens elements and the lateral aberration as well as various aberrations thereof are greatly corrected.
Inventors
- 👤 Toshinobu Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:57
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 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 11 elements successively mounted from the object side comprising; first and second lenses of the divergent meniscus type each having its convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the convergent type having its convex surface facing the object, a sixth element is a filter, a seventh lens of the convergent meniscus lens type having its convex surface facing the image, an eighth lens of the divergent meniscus type having its convex surface facing the image, a ninth lens of the divergent type, a 10th lens of the biconvex type, an 11th lens of the convergent type, wherein the indicated lens elements have the following characteristics,
Claim 2
Dependent Claim
143 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 11 elements successively mounted from the object side comprising; first and second lenses of the divergent meniscus type each having its convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the convergent type having its convex surface facing the object, a sixth element is a filter, a seventh lens of the convergent meniscus lens type having its convex surface facing the image, an eighth lens of the divergent meniscus type having its convex surface facing the image, a ninth lens of the divergent type, a 10th lens of the biconvex type, an 11th lens of the convergent type, wherein the indicated lens elements have the following characteristics,
Claim 3
Dependent Claim
142 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 11 elements successively mounted from the object side comprising; first and second lenses of the divergent meniscus type each having its convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the convergent type having its convex surface facing the object, a sixth element is a filter, a seventh lens of the convergent meniscus lens type having its convex surface facing the image, an eighth lens of the divergent meniscus type having its convex surface facing the image, a ninth lens of the divergent type, a 10th lens of the biconvex type, an 11th lens of the convergent type, wherein the indicated lens elements have the following characteristics,
Claim 4
Dependent Claim
142 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 11 elements successively mounted from the object side comprising; first and second lenses of the divergent meniscus type each having its convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the convergent type having its convex surface facing the object, a sixth element is a filter, a seventh lens of the convergent meniscus lens type having its convex surface facing the image, an eighth lens of the divergent meniscus type having its convex surface facing the image, a ninth lens of the divergent type, a 10th lens of the biconvex type, an 11th lens of the convergent type, wherein the indicated lens elements have the following characteristics,
Claim 5
Dependent Claim
142 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 11 elements successively mounted from the object side comprising: first and second lenses of the divergent meniscus type each having its convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the convergent type having its convex surface facing the object, a sixth element Is a filter, a seventh lens of the convergent meniscus lens type having its convex surface facing the image, an eighth lens of the divergent meniscus type having its convex surface facing the image, a ninth lens of the divergent type, a 10th lens of the biconvex type, an 11th lens of the convergent type, wherein the indicated lens elements have the following characteristics,
Claim 6
Dependent Claim
142 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 11 elements successively mounted from the object side comprising: first and second lenses of the divergent meniscus type each having its convex surface facing the object, a third lens of the divergent type, a fourth lens of the biconvex type, a fifth lens of the convergent type having its convex surface facing the object, a sixth element Is a filter, a seventh lens of the convergent meniscus lens type having its convex surface facing the image, an eighth lens of the divergent meniscus type having its convex surface facing the image, a ninth lens of the divergent type, a 10th lens of the biconvex type, an 11th lens of the convergent type, 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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |