Patent ID: 6575642
Filing Date: 2003-06-10
Classification: G02B

Abstract:
A lens barrel comprising:a plurality of cylindrical bodies, accommodating an optical lens system having a plurality of lens groups, extending and collapsing said optical lens system in a multistage manner; a first driving source, installed in one of said cylindrical bodies, for generating a first driving force; a first driving transmission mechanism for transmitting the first driving force of said first driving source to a barrier opening/closing mechanism; a second driving transmission mechanism for transmitting the first driving force of said first driving source to a moving mechanism of said optical lens system; driving transmission switching means for placing said first driving transmission mechanism into a state capable of transmitting the first driving force to said barrier opening/closing mechanism when said plurality of cylindrical bodies are collapsed to a predetermined extent or more, and placing said first driving transmission mechanism into a state incapable of transmitting the first driving force to said barrier opening/closing mechanism when said plurality of cylindrical bodies are extended to a predetermined extent or more; and a second driving source for adjusting focus by moving said optical lens system in a totally extended state when said first driving source is stopped, if the first driving force is transmittable to said barrier opening/closing mechanism by said driving transmission switching means.