Lens barrel and method for controlling the same

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 rota...

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Bibliographic Details
Main Author KATSUHIKO FUNO
Format Patent
LanguageChinese
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
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Summary: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
Bibliography:Application Number: CN200910207005