ZOOM LENS AND IMAGING DEVICE INCLUDING THE SAME

• Main Authors: FUJIKURA TAKASHI, KAWAMURA KAZUTERU
• Format: Patent
• Language: English; Japanese
• Published: 13.07.2017
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a zoom lens that is compact and light weight, and has sufficiently reduced various aberrations while having a large variable power ratio and a sufficiently wide angle of view, and an imaging device including the same.SOLUTION: A zoom lens comprises a front group having a negative refractive power and a rear group having a positive refractive power; the front group includes a first lens having a negative refractive power, and the first lens is a meniscus lens that is arranged closest to an object side and has a convex surface directed to the object side; the rear group includes two lens units; the interval between the front group and rear group is reduced and the interval between the two lens units is changed in changing magnification; the first lens unit includes two sub lens units and an aperture stop; the first lens unit includes a first focus lens group and a second focus lens group closer to an image side than the first focus lens group; the interval between the first sub lens unit and second sub lens unit is changed or remains constant in changing magnification.SELECTED DRAWING: Figure 1 【課題】小型、軽量であって、かつ、大きな変倍比と、十分に広い画角を持ちながらも諸収差が十分に低減されたズームレンズ及びそれを有する撮像装置を提供すること。【解決手段】ズームレンズは、負屈折力の前群と正屈折力の後群とからなり、前群は、負屈折力の第１のレンズを含み、第１のレンズは最も物体側に配置され、物体側に凸面を向けたメニスカスレンズであり、後群は、２つのレンズユニットを有し、変倍に際して、前群と後群との間隔は狭くなり、２つのレンズユニットの間隔は変化し、第１のレンズユニットは２つのサブレンズユニットと開口絞りとで構成され、第１のレンズユニットは第１のフォーカスレンズ群を有し、第１のフォーカスレンズ群より像側に第２のフォーカスレンズ群を有し、変倍に際して、第１のサブレンズユニットと第２のサブレンズユニットとの間隔は変化するか、又は一定である。【選択図】図１