US3915558A
Expired / Lapsed
US
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High power wide-angle lens
Assignee: Carl Zeiss AG
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Filing: 1974-02-01
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Granted: 1975-10-28
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Expires: 1994-02-01
Abstract
Abstract A wide-angle lens whose back focus (for remote objects at infinity) is greater than 85 percent of the equivalent focal length of the entire lens assembly, and whose relative aperture is between f/1.8 and f/1.2, with an exceptionally high photographic performance and particularly low residual aberrations of high order over an angular field of view of more than 60*. Rules or conditions are stated which, if followed, will enable the production of lenses having these desirable characteristics. Eight specific examples are given.
Inventors
- 👤 Erhard Glatzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:58
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
426 words
A very high power wide-angle lens having eight lens components formed into a front member of four components and a rear member of four components separated from the front member by a diaphragm space, the first component, considering the components as numbered consecutively from front to rear, being a negative component of strong refractive power, the second component being air spaced from the first component and being a negative component of weaker refractive power, the third component being air spaced from the second component and having positive power, the fourth component being a meniscus with a convex front surface and having not more than a slight refractive power, the fifth and sixth components both being negative and being separated from each other by air space, the seventh and eighth components both being positive and being separated from each other by air space and both having rear surfaces which are convex toward the rear, said components being so constructed that they substantially fulfill simultaneously all of the following conditions: a. the sum of the surface refractive powers ( phi 2) of the second component is not more than 0.60147 of the surface refractive powers ( phi 1) of the first component; b. the sum of the surface refractive powers ( phi ) of the two surfaces limiting the air lens space between the second component and the third component being less than 0.13607 times the equivalent refractive power ( Phi ) of the entire lens; c. the sum of the absolute value of the surface refractive powers ( phi 5) of the fifth component is less than 0.70376 times the sum of the surface refractive powers ( phi 3) of the third component; d. the sum of the surface refractive powers (4) of the meniscus fourth component is less than 0.16308 times the equivalent refractive power ( Phi ) of the entire lens; e. the sum of the surface refractive powers ( phi 5) of the fifth component is not more than 0.50769 times the sum of the surface refractive powers ( phi 6) of the sixth component; f. the refractive indices (n7 and n8) of the glasses from which the seventh and eighth components are made are greater than the refractive index (n5) of the glass from which the fifth component is made; and g. the refractive index (n5) of the glass from which the fifth component is made is less than the arithmetical mean of the isochromatic indices of refraction (n3 and n6) of the glasses from which the third and sixth components are made.
Claim 2
Dependent Claim
426 words
A very high power wide-angle lens having eight lens components formed into a front member of four components and a rear member of four components separated from the front member by a diaphragm space, the first component, considering the components as numbered consecutively from front to rear, being a negative component of strong refractive power, the second component being air spaced from the first component and being a negative component of weaker refractive power, the third component being air spaced from the second component and having positive power, the fourth component being a meniscus with a convex front surface and having not more than a slight refractive power, the fifth and sixth components both being negative and being separated from each other by air space, the seventh and eighth components both being positive and being separated from each other by air space and both having rear surfaces which are convex toward the rear, said components being so constructed that they substantially fulfill simultaneously all of the following conditions: a. the sum of the surface refractive powers ( phi 2) of the second component is not more than 0.60147 of the surface refractive powers ( phi 1) of the first component; b. the sum of the surface refractive powers ( phi ) of the two surfaces limiting the air lens space between the second component and the third component being less than 0.13607 times the equivalent refractive power ( Phi ) of the entire lens; c. the sum of the absolute value of the surface refractive powers ( phi 5) of the fifth component is less than 0.70376 times the sum of the surface refractive powers ( phi 3) of the third component; d. the sum of the surface refractive powers (4) of the meniscus fourth component is less than 0.16308 times the equivalent refractive power ( Phi ) of the entire lens; e. the sum of the surface refractive powers ( phi 5) of the fifth component is not more than 0.50769 times the sum of the surface refractive powers ( phi 6) of the sixth component; f. the refractive indices (n7 and n8) of the glasses from which the seventh and eighth components are made are greater than the refractive index (n5) of the glass from which the fifth component is made; and g. the refractive index (n5) of the glass from which the fifth component is made is less than the arithmetical mean of the isochromatic indices of refraction (n3 and n6) of the glasses from which the third and sixth components are made.
Claim 3
Dependent Claim
72 words
A lens as defined in claim 1, wherein the third component is formed of at least two lens elements, the front element (3a) of which has such relationship to the rear element (3b) that the absolute value of the sum of the surface refractive powers ( phi 3b) of said rear element is not more than 0.53301 times the sum of the surface refractive powers ( phi 3a) of said front element.
Claim 4
Dependent Claim
61 words
A lens as defined in claim 2, wherein there is an intermediate lens (3i) between said front element (3a) and said rear element (3b) of said third component, and wherein the sum of the surface refractive powers ( phi 1) of said intermediate lens is less than 0.06956 times the equivalent refractive power ( Phi ) of the entire lens system.
Claim 5
Dependent Claim
15 words
A lens as defined in claim 3, wherein said intermediate lens is an air lens.
Claim 6
Dependent Claim
24 words
A lens as defined in claim 1, wherein at least one of the component surfaces adjoining air is developed as an aspherical deformed surface.
Claim 7
Dependent Claim
29 words
A lens as defined in claim 5, wherein said aspherical deformed surface is a surface in the vicinity of said diaphragm space and has a relatively small outer diameter.
Claim 8
Dependent Claim
21 words
A lens as defined in claim 1, wherein each of said eight components is formed from only a single lens element.
Claim 9
Dependent Claim
35 words
A lens as defined in claim 1, wherein a majority of said eight components are formed from only a single lens element and at least one component is formed from a plurality of lens elements.
Claim 10
Dependent Claim
19 words
A lens as defined in claim 8, wherein said first component is formed from a plurality of lens elements.
Claim 11
Dependent Claim
20 words
A lens as defined in claim 1, wherein said sixth component and said seventh component are cemented to each other.
Claim 12
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 13
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 14
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 15
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 16
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 17
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 18
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 19
Dependent Claim
34 words
A lens as defined in claim 1, wherein the characteristics of the lens components and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |