Camera system
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsMasahiro Kawasaki, Hiroyuki Takahashi, Shigeru Iwamoto
Life of this patent
Estimating the term…
Abstract
A camera system for communicating data including focal length data between a micro computer in a camera body and a zoom lens mounted to the camera body, wherein the zoom lens includes a position detecting device which detects divided focal length steps corresponding to optional focal lengths of the zoom lens, a specific focal length outputting device which outputs at least one focal length of the focal length step detected by the position detecting device, and an arithmetic operating device which calculates a focal length for each focal length step in accordance with the data of the position detecting device and the specific focal length outputting device.
Claims19
A camera system for communicating data between a micro computer associated with a camera body and a zoom lens that is selectively mounted to said camera body, wherein at least focal length data is transmitted from said zoom lens to said micro computer, said zoom lens comprising:
- a position detecting means for detecting divided focal length steps corresponding to optional focal lengths of said zoom lens;
- a specific focal length outputting means for outputting at least one focal length of a focal length step detected by said position detecting means;
- and,
- an arithmetic operating means for calculating a focal length in each focal length step, in accordance with data representing a divided focal length step detected by said position detecting means and data representing a focal length from said specific focal length outputting means.
A camera system for communicating data between a processor associated with a camera body and a lens that is selectively mounted to said camera body, said lens comprising:
- a memory that stores a telephoto extremity focal length of said lens and a common ratio of said lens in accordance with said detected lens type;
- a focal length calculator that calculates a focal length by geometrically dividing a focal length of said lens in accordance with said telephoto extremity focal length and common ratio stored in said memory;
- and
- a temporary memory that temporarily stores said calculated focal length.
A camera system, comprising:
- a camera body having a processor;
- a zoom lens that is selectively mountable to said camera body,
- a lens type detector associated with said camera body that determines what type of lens is mounted to said camera body;
- a storage device that is associated with said lens that functions to essentially permanently store data representing a telephoto extremity focal length and a common ratio of said lens, in accordance with said detected lens type;
- a focal length calculator that calculates a focal length of said lens that is geometrically divided correspondingly to said detected lens type in accordance with said data stored in said first storage device;
- a temporary storage device that temporarily stores said calculated focal length;
- and
- means for transmitting the temporarily stored calculated focal length to said processor associated with said camera body.
Dependencies are inferred from the claim text.