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1. (WO2018135000) LENS SYSTEM, IMAGING DEVICE, MOVING BODY, AND SYSTEM

Pub. No.:    WO/2018/135000    International Application No.:    PCT/JP2017/002137
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Tue Jan 24 00:59:59 CET 2017
IPC: G02B 13/00
G02B 13/18
Applicants: SZ DJI TECHNOLOGY CO., LTD
エスゼット ディージェイアイ テクノロジー カンパニー リミテッド
Inventors: CHEN Yonghua
陳 永華
OHATA Atsushi
大畑 篤
MATSUNAGA Shigehiko
松永 滋彦
Title: LENS SYSTEM, IMAGING DEVICE, MOVING BODY, AND SYSTEM
Abstract:
This lens system is provided with, sequentially from the objective side: a first lens group that has positive or negative refractive power; a first focus lens group that has positive refractive power; and a second focus lens group that has negative refractive power, wherein the first focus lens group has at least one lens having positive refractive power, the second focus lens group has at least one lens having negative refractive power, and, during focusing from infinite distance to close range, the position of the first lens group is fixed, the first focus lens group is moved to the objective side, the second focus lens group is moved to the image side, and the conditional expression of 0.5˂|fp/fn|˂9.0 is satisfied, in which fp represents the focal distance of the first lens group, and fn represents the focal distance of the second focus lens group.