1976-12-02
1979-01-30
Sacher, Paul A.
350176, 350214, G02B 304, G02B 964
Patent
active
041369319
ABSTRACT:
A high speed wide angle lens system of the same general kind disclosed in Glatzel, U.S. Pat. No. 3,915,558, but with a slightly larger aperture and with improved image formation. While the lens formation of the U.S. Pat. No. 3,915,558 starts with two negative components, followed by a positive component, a meniscus, two negative components and two positive components in the rear part, the improved performance of the present invention is achieved by such a modification which enforces the positive power of the rear part of the lens. For this purpose the rear part is made to consist of three positive components (VII, VIII, IX) which are designed in such a way that the quotient of the sum of the surface powers of the air lenses between the three rear positive components .SIGMA..phi..sub..delta. divided by the refractive power (.phi..sup.+.sub.EO) of the air lens between the two positive components of the front part of the lens (III, IV) lies between a disclosed upper and lower limit and that in addition to this rule the paraxial surface power sum of the second-last component (VIII) also is within disclosed limits times the paraxial surface power sum of the third-last component (VII). Eight specific examples are given to illustrate the validity of the disclosed conditions and rules.
REFERENCES:
patent: 3589798 (1971-06-01), Ogura
patent: 3915558 (1975-10-01), Glatzel
patent: 3999840 (1976-12-01), Momiyama
patent: 4025169 (1977-05-01), Fischer et al.
Carl Zeiss Stiftung
Sacher Paul A.
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