Automatic focusing camera with control of focusing optical system position and driving power source velocity

A lens barrel which is detachably mounted to a camera body having focus detecting means, and calculating means for calculating driving information of a focusing optical system based upon a focus detecting signal obtained by said focus detecting means, and in which said focusing optical system is incorporated, comprising:

• driving means, said driving means having a driving power source, and a transmission member for transmitting driving power of said driving power source to drive said focusing optical system;
• first signal generating means, said first signal generating means being provided at a final stage of said transmission member to generate a first driving signal in response to driving of said focusing optical system;
• second signal generating means, said second signal generating means being provided at an initial stage of said transmission member to generate a second driving signal in response to driving of said driving power source;
• and
• driving control means, said driving control means controlling position of said focusing optical system based upon said first driving signal and said driving information and controlling velocity of said driving power source based upon said second driving signal;
• wherein said lens barrel further comprises terminal means, said terminal means transmitting said first driving signal to said calculating means in real time.