Optical viewfinder
AssigneePanasonic Corporation
InventorDai SHINTANI
Life of this patent
Estimating the term…
Abstract
An optical viewfinder is configured to be attached to a camera body with an interchangeable lens. The optical viewfinder includes: a viewfinder optical system 301 including a scalable objective lens group 330; a stepping motor 305 configured to drive the objective lens group 330 along an optical axis; and a control circuit configured to control driving of the stepping motor 305 based on a result of detection by a PI 306. When a variable focal length lens (an interchangeable lens) is attached to a camera body, the control circuit controls driving of the objective lens group 330 in accordance with a focal length of the interchangeable lens.
Claims8
An optical viewfinder configured to be attached to a camera body with an interchangeable lens, the optical viewfinder comprising:
- a viewfinder optical system including a scalable objective lens group;
- a drive source configured to drive at least one objective lens of the objective lens group along an optical axis;
- a detector configured to detect a position of the at least one objective lens;
- a control circuit configured to control driving of the drive source based on a result of detection by the detector;
- and
- an electric contact configured to be electrically coupled to the camera body, wherein
- when a variable focal length lens is attached to the camera body as the interchangeable lens, the control circuit controls driving of the drive source to adjust a magnification of the objective lens group, based on information on a focal length of the variable focal length lens received from the camera body through the electric contact.
Dependencies are inferred from the claim text.