Lens barrel and method for controlling the same

• Main Author: KATSUHIKO FUNO
• Format: Patent
• Language: Chinese; English
• Published: 17.08.2011
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS

At least one objective of the present invention is to provide a lens barrel capable of detecting a position of a retractable lens retaining frame with high accuracy, a lens driving apparatus, a camera, and a mobile information terminal using the lens barrel. A third frame female member (35) for rotating a third frame (31) around a lead screw (34) and driving the third frame (31) in forward and backward directions along the lead screw (34) is formed with a T-shared protruded member (350) as a detected portion located at a position opposite side of a rotation-preventing projection (35b). The T-shared protruded member (350) structures a position of the third frame (31) together with a transmissive photo-interrupter (351), to decide a reference position for a retracted position in a retractedstate of the third frame (31) and for an optical axis entrance completed position of the third frame (31) at the time when a transition has changed from a retracted state to a photographable state, and to detect a distance fr