IMAGE CAPTURING OPTICAL SYSTEM AND IMAGE CAPTURING DEVICE HAVING THE SAME

• Main Author: FUJIKURA TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2021
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SURGERY

To provide an image capturing optical system which is compact and yet offers high resolution.SOLUTION: An image capturing optical system has multiple lens groups, each comprising lens components having multiple optical surfaces. Each lens component has two optical surfaces in contact with air and at least one optical surface is a curved surface. The multiple lens groups comprise, in order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Only the second lens group moves toward the image side when shifting focus from a far point to a near point. The first lens group comprises, in order from the object side, a negative first lens component, a negative second lens component, and multiple positive lens components. The second lens group has a negative lens component. An aperture stop is provided in the first lens group.SELECTED DRAWING: Figure 1 【課題】小型でありながら、高い分解能を有する撮像光学系を提供する。【解決手段】撮像光学系は、複数のレンズ群を有し、複数のレンズ群の各々は、レンズ成分を有し、レンズ成分は、複数の光学面を有し、レンズ成分では、２つの光学面が空気と接触し、且つ、少なくとも１つの光学面が曲面であり、複数のレンズ群は、物体側から順に、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、正の屈折力を有する第３レンズ群と、を有し、遠点から近点への合焦時、第２レンズ群のみが像側に移動し、第１レンズ群は、物体側から順に、第１負レンズ成分と、第２負レンズ成分と、複数の正レンズ成分と、を有し、第２レンズ群は、負レンズ成分を有し、開口絞りは、第１レンズ群に配置されている。【選択図】図１