| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens device capable of preventing the generation of condensation on a lens regardless of the temperature of a use environment.SOLUTION: A lens device 300 detachably connected to an imaging device for imaging a subject and generating image data of the subject has: a lens frame 310 making optical axes of a plurality of lenses match, and arranging the lenses to be stored therein and fixed; a first lens 320 fixed at one end of the lens frame 310; a second lens 330 fixed at an intermediate portion in an optical axis direction of the lens frame 310; and a third lens 340 fixed to the other end of the lens frame 310. The lens frame 310 has a coupling hole 318 for coupling a first space K1 and a second space K2, and a ratio of surface area of an outer surface of the lens frame 310 and the volume of the lens frame 310 is 4 or more. |
