| 摘要 |
PURPOSE:To provide the optical device where focusing of lens can be carried out without utilizing a mechanical apparatus such as a cam or a gear. CONSTITUTION:A hollow state main body 1, a lens barrel 3 holding the lens 4 and contained into the main body, a projection 5 provided on an outer periphery surface of this lens barrel 3 and separating a space part between the outer periphery surface of the barrel and the inner periphery surface of the main body 1 into two, a first nozzle hole 7a and a second nozzle hole 7b feeding fluid separated by the projection 5 and holding the lens barrel 3 against the main body 1 in a state of non contact, and a control device 12 controlling pressure force of the fluid fed to the first nozzle hole 7a and the second nozzle hole 7b are provided. |
