OPTICAL SYSTEM AND IMAGING APPARATUS HAVING THE SAME

• Main Author: GYODA YUICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.12.2018
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide an optical system small in size, which has a vibration-proof function and high optical performance from an infinite distance to a close range, and an imaging apparatus having the optical system.SOLUTION: The optical system has, successively from an object side to an image side, a first lens group L1 that has a positive refractive power and is immobile upon focusing, a second lens group L2 that moves in an optical axis direction upon focusing, an aperture stop SP, and a lens group that moves in the optical axis direction upon focusing, in which an interval between adjoining lens groups varies upon focusing. The first lens group L1 has a first partial group L11 having a positive refractive power and a second partial group L12 having a positive refractive power. Upon correcting image blur, the second partial group L12 moves in a direction that has a component in a direction perpendicular to the optical axis.SELECTED DRAWING: Figure 1 【課題】防振機能を備え、無限遠から至近まで高い光学性能を有しながら、小型の光学系およびそれを有する撮像装置を提供する。【解決手段】物体側から像側へ順に、正の屈折力を有し、フォーカシングに際して不動の第１レンズ群Ｌ１、フォーカシングに際して光軸方向に移動する第２レンズ群Ｌ２、開口絞りＳＰ、フォーカシングに際して光軸方向に移動するレンズ群を有し、フォーカシングに際して隣り合うレンズ群の間隔が変化し、前記第１レンズ群Ｌ１は、正の屈折力を有する第１部分群Ｌ１１と、正の屈折力を有する第２部分群Ｌ１２を有し、像ぶれ補正に際して前記第２部分群Ｌ１２が光軸に対して垂直方向の成分を持つ方向に移動することを特徴とする光学系。【選択図】図１