| abstract |
The present invention provides a variable focal length lens device, which comprises: an objective lens and an imaging lens arranged on the same optical axis; a front side lens system and a rear side lens system, wherein the objective lens and a section between the imaging lenses, and the refractive index is changed according to an input drive signal; and a diaphragm provided in the section between the front-side lens system and the rear-side lens system on the optical axis. |