公开(公告)号：US20190121056A1

公开(公告)日：2019-04-25

申请号：US16161835

申请日：2018-10-16

Applicant: MITUTOYO CORPORATION

Inventor： Tatsuya NAGAHAMA ,  Koji KUBO ,  Yuko SHISHIDO ,  Masaki OKAYASU ,  Atsushi USAMI

IPC: G02B7/10 ,  G02B9/04 ,  H04N5/225

Abstract: A variable focal length lens apparatus includes an objective lens and an imaging lens that are aligned on the same optical axis; a front side lens system and a rear side lens system that are disposed in a section between the objective lens and the imaging lens on the optical axis, and change a refractive index in accordance with an input drive signal; and a diaphragm disposed in the section between the front side lens system and the rear side lens system on the optical axis.