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Patent Searching and Data


Title:
LENS BARREL AND IMAGING APPARATUS USING THE SAME
Document Type and Number:
Japanese Patent JP2009251265
Kind Code:
A
Abstract:

To provide a lens barrel capable of preventing deterioration of positional accuracy, reducing drive load and performing stable operation including environmental factors in constitution where a lens moving frame is driven by a cam barrel.

A main body-side contact ball and a maser flange-side contact ball are incorporated in a cam barrel unit. The main body-side contact ball comes into contact with a main body and a cam gear by a ring biasing spring, and the master flange-side contact ball comes into contact with the main body and the cam gear by the ring biasing spring, whereby the cam barrel unit is held in such a state that there exists no clearance in an optical axis direction between the main body and a master flange. When a motor unit and the cam barrel unit are turned in such a holding state, the main body-side contact ball and the master flange-side contact ball move while rolling. Since the cam barrel unit turns, the drive load is made very small and change of the drive load caused by temperature change or the like becomes small.


Inventors:
TONOMURA TETSUYA
Application Number:
JP2008099021A
Publication Date:
October 29, 2009
Filing Date:
April 07, 2008
Export Citation:
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Assignee:
PANASONIC CORP
International Classes:
G02B7/04
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano