Camera employing zone focusing
December 22, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3522764 Focusing apparatus for optical systems Photographic camera having independent viewfinder and reflex focusing system Autofocus movie camera having focus correction means Focus control system for interchangeable adjustable focus lenses Automatic focusing camera Ultrasonic ranging system for a camera Camera focus detecting device Patent #: 4230401 InventorAssigneeApplicationNo. 06/218813 filed on 12/22/1980US Classes:396/102, Having in-focus threshold adjustable396/147Having indicatorExaminersPrimary: Gellner, Michael L.Attorney, Agent or FirmInternational ClassG02B 7/40 (20060101)AbstractA camera having a displaceable lens includes a lens position sensor and a converter for converting the sensor output into a representation of the in-focus distance associated with that lens position. The in-focus distance of the lens is then compared to the distance of the subject as determined by a rangefinder (e.g., an ultrasonic rangefinder). A visual indication is provided in the viewfinder prompting the user to manually change the position of the lens in a direction that improves the focus or, alternately, the relationship is used for controlling a motor to move the lens to a position at which the subject is in focus. | |
