# US 9,519,126 B2 · Zoom lens and imaging apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,126 B2 - Document ID: US9519126B2 - Status: Granted - Kind: B2 - Application number: 14/702,952 - Filed: 2015-05-04 - Published: 2015-09-03 - Granted: 2016-12-13 - Earliest claimed: 2012-11-08 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Shinkichi Ikeda; Toshihiro Aoi - Web page: https://patentgrep.com/patent/US9519126B2 ## CPC - G02B 15/173: arranged +-+ - G02B 15/144113: {arranged +-++} - G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)} - H04N 23/685: {performed by mechanical compensation} - H04N 23/687: {by shifting the lens or sensor position} - G02B 5/005: {Diaphragms (for cameras G03B9/02)} - G02B 7/023: {permitting adjustment} - G02B 7/10: by relative axial movement of several lenses, e.g. of varifocal objective lens - G02B 9/34: having four components only - G02B 13/0045: {having five or more lenses} - G02B 13/009: {having zoom function} - G02B 15/20: having an additional movable lens or lens group for varying the objective focal length - G02B 27/0025: {for optical correction, e.g. distorsion, aberration} - G03B 2205/0015: by displacing one or more optical elements normal to the optical axis - G03B 2205/0046: Movement of one or more optical elements for zooming - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A zoom lens consists of a positive first lens group, a negative second lens group moved from the object side to the image plane side during zooming from the wide angle end to the telephoto end, a positive third lens group moved during zooming, and a positive fourth lens group, in order from the object side. The second and third lens groups each pass through a point where the imaging magnification of each corresponding lens group is −1× at the same time during zooming from the wide angle end to the telephoto end. The fourth lens group includes, on the most object side, a vibration-proof lens group, composed of a negative lens, a positive meniscus lens with a convex surface on the object side, and a negative lens, in order from the object side, and either one of the negative lenses satisfies predetermined conditional expressions. ## Claims ### Claim 1 A zoom lens, consisting of a first lens group having a positive refractive power and being fixed during zooming, a second lens group having a negative refractive power and being moved from the object side to the image plane side during zooming from the wide angle end to the telephoto end, a third lens group having a positive refractive power and being moved during zooming, and a fourth lens group having a positive refractive power and being fixed during zooming, in order from the object side wherein: the second lens group and the third lens group each pass through a point where the imaging magnification of each corresponding lens group is −1× at the same time during zooming from the wide angle end to the telephoto end; the fourth lens group includes, on the most object side, a vibration-proof lens group G4A which is moved in a direction perpendicular to the optical axis for vibration-proofing; the vibration-proof lens group G4A is composed of a negative lens L41, a positive meniscus lens L42 with a convex surface on the object side, and a negative lens L43, in order from the object side; and either one of the negative lens L41 and the negative lens L43 satisfies conditional expressions given below: N4<1.68 (1) 58<ν4 (2) where, N4: refractive index of the negative lens L41 or the negative lens L43, and ν4: Abbe number of the negative lens L41 or the negative lens L43. ### Claim 2 (depends on 1) The zoom lens of claim 1, wherein the zoom lens satisfies a conditional expression given below: 2.5