US3864026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle photographic lens
Assignee: Carl Zeiss AG
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Filing: 1973-09-19
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Granted: 1975-02-04
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Expires: 1993-09-19
Abstract
Abstract A wide angle photographic lens or objective, having a rear member (behind the central vertex distance or space) and a front member, the front member being composed of three or more groups or assemblies. Five specific examples are disclosed, falling into three general configurations. Various limits are stated for the relationship of the various lens elements or groups of elements to each other, and if these limits are followed in designing the lens, an objective of excellent quality and wide angular field of view can be obtained.
Inventors
- 👤 Erhard Glatzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:14
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
181 words
A wide angle lens system with a relatively long back focus on the image side and a relatively large angle of view, comprising a rear member behind an aperture space and a front member in front of said aperture space, said rear member comprising at least three lens elements each with air on both sides, the forward element adjacent said aperture space being a negative element followed in a rearward direction by two positive elements, said front member comprising at least three groups of lens elements, each group having a negative component at the front of the group and a positive component rearwardly of such negative component, the negative component and positive component of each group enclosing between them a diverging-acting air space constituting a negative air lens, each of said air lenses having a more strongly diverging glass-air surface which is concave toward an image at the rear of the lens system, the successive groups in order from the aperture space forwardly being respectively designed Gr. (a) and Gr. (b) and Gr. (c), the lens elements being so constructed that:
Claim 2
Dependent Claim
181 words
A wide angle lens system with a relatively long back focus on the image side and a relatively large angle of view, comprising a rear member behind an aperture space and a front member in front of said aperture space, said rear member comprising at least three lens elements each with air on both sides, the forward element adjacent said aperture space being a negative element followed in a rearward direction by two positive elements, said front member comprising at least three groups of lens elements, each group having a negative component at the front of the group and a positive component rearwardly of such negative component, the negative component and positive component of each group enclosing between them a diverging-acting air space constituting a negative air lens, each of said air lenses having a more strongly diverging glass-air surface which is concave toward an image at the rear of the lens system, the successive groups in order from the aperture space forwardly being respectively designed Gr. (a) and Gr. (b) and Gr. (c), the lens elements being so constructed that:
Claim 3
Dependent Claim
35 words
The paraxial focal length (fa) of the rearmost group Gr. (a) of the front member is between the limits of 1.134 times and 2.055 times the equivalent focal length (F) of the entire lens system.
Claim 4
Dependent Claim
35 words
The paraxial focal length (fa) of the rearmost group Gr. (a) of the front member is between the limits of 1.134 times and 2.055 times the equivalent focal length (F) of the entire lens system.
Claim 5
Dependent Claim
23 words
The absolute value of the paraxial focal length (fb) of the group Gr. (b) is between the limits of 8.148F and 2.433 F.
Claim 6
Dependent Claim
23 words
The absolute value of the paraxial focal length (fb) of the group Gr. (b) is between the limits of 8.148F and 2.433 F.
Claim 7
Dependent Claim
23 words
The absolute value of the paraxial focal length (fb) of the group Gr. (b) is between the limits of 8.148F and 2.433 F.
Claim 8
Dependent Claim
23 words
The absolute value of the paraxial focal length (fb) of the group Gr. (b) is between the limits of 8.148F and 2.433 F.
Claim 9
Dependent Claim
47 words
A lens system as defined in claim 1, having in its front member a fourth group Gr. (d) arranged forwardly of Gr. (c), the paraxial focal length (fd) of this group Gr. (d) is, in its negative value, within the limits of 5.826 F and 7.724 F.
Claim 10
Dependent Claim
85 words
A lens system as defined in claim 2, wherein said fourth group Gr. (d) consists of only a single lens element which element is negative and which acts as the equivalent of a group having both a negative and a positive element, the air lens of said fourth group Gr. (d) being formed between the rear surface of said single element and the front surface of the negative component at the front of the next succeeding group Gr. (c) behind said fourth group Gr. (d).
Claim 11
Dependent Claim
34 words
The numerical value of the paraxial focal length (fc,b) of the combination of the two groups Gr. (c) and Gr. (b) has an absolute value between the limits of 2.40 F and 5.373 F.
Claim 12
Dependent Claim
34 words
The numerical value of the paraxial focal length (fc,b) of the combination of the two groups Gr. (c) and Gr. (b) has an absolute value between the limits of 2.40 F and 5.373 F.
Claim 13
Dependent Claim
34 words
The numerical value of the paraxial focal length (fc,b) of the combination of the two groups Gr. (c) and Gr. (b) has an absolute value between the limits of 2.40 F and 5.373 F.
Claim 14
Dependent Claim
34 words
The numerical value of the paraxial focal length (fc,b) of the combination of the two groups Gr. (c) and Gr. (b) has an absolute value between the limits of 2.40 F and 5.373 F.
Claim 15
Dependent Claim
58 words
A lens system as defined in claim 2, wherein the air lens refractive power ( phi ) of the air lens ( delta ) of the fourth group Gr. (d) is, in its negative value, within the limits of 0.145 Phi and 0.336 in which Phi is the equivalent refractive power of the entire lens system, being 1/F.
Claim 16
Dependent Claim
59 words
A lens system as defined in claim 4, characterized by the fact that said fourth group Gr. (d) does not include any positive lens element, and that the air lens ( delta ) of the fourth group is formed between a meniscus shaped negative lens of the fourth group and the front lens of the third group Gr. (c).
Claim 17
Dependent Claim
74 words
A lens system as defined in claim 1, wherein the air lens refractive power ( phi ) as the sum of the surface refractive powers of the two radii of curvature enclosing the air lens gamma in the group Gr. (c) is so dimensioned that the negative value of gamma is within the limits of 0.291 Phi and 0.390 in which Phi is the equivalent refractive power of the entire lens system, being 1/F.
Claim 18
Dependent Claim
45 words
A lens sytem as defined in claim 1, characterized by he fact that a lens component in the vicinity of said aperture space is divided into two lens elements with a finite air space between them, and a filter is interposed in said air space.
Claim 19
Dependent Claim
41 words
A lens system as defined in claim 7, wherein said divided component is the component next in front of said aperture space, being the rearmost component of the rearmost group Gr. (a) of the front member (Vgl of the lens system.
Claim 20
Dependent Claim
35 words
A lens system as defined in claim 1, wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 21
Dependent Claim
35 words
A lens system as defined in claim 1, wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 22
Dependent Claim
35 words
A lens system as defined in claim 1, wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 23
Dependent Claim
35 words
A lens system as defined in claim 1, wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table:
Claim 24
Dependent Claim
35 words
A lens system as defined in claim 1, wherein the characteristics of the lens elements 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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |