US 11,656,432 B2
Compact telephoto lens having materials with anomalous relative partial dispersion
Friedrich Daniel Werdehausen, Herbrechtingen (DE); Hans-Juergen Dobschal, Bad Sulza (DE); and Markus Seesselberg, Aalen (DE)
Assigned to Carl Zeiss AG, Oberkochen (DE)
Filed by Carl Zeiss AG, Oberkochen (DE)
Filed on Feb. 15, 2022, as Appl. No. 17/672,266.
Claims priority of application No. 102021103587.2 (DE), filed on Feb. 16, 2021.
Prior Publication US 2022/0260808 A1, Aug. 18, 2022
Int. Cl. H04N 5/225 (2006.01); G02B 13/00 (2006.01); G02B 15/00 (2006.01); G02B 13/02 (2006.01)
CPC G02B 13/002 (2013.01) [G02B 13/02 (2013.01); G02B 15/00 (2013.01); H04N 5/2254 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A lens for a camera, the camera comprising a longitudinal axis, a focal length and an installation length in the direction of the longitudinal axis of less than 10 millimeters (mm), the lens comprising:
a plurality of refractive optical elements; and
a stop with a maximum diameter,
wherein the focal length of the lens is in the range of 25 mm to 6 mm,
wherein a ratio of focal length to the maximum diameter of the stop is in the range of 1.4 to 8,
wherein at least one of the plurality of refractive optical elements comprises a material with an Abbe number νd and for which the absolute value of the difference ΔPg,F=|Pg,F−Pg,Fnormal| between relative partial dispersion Pg,F of the material and a normal relative partial dispersion Pg,Fnormal at the Abbe number νd of the material is at least 0.05, and
wherein the normal relative partial dispersion Pg,Fnormal is defined by

OG Complex Work Unit Math