| 摘要 |
PROBLEM TO BE SOLVED: To provide a focusing structure capable of easily adjusting the position of a lens and accurately adjusting a focus. SOLUTION: An external thread is formed on the external wall of the lens. An internal thread is formed on the internal wall of a rotor. An internal thread capable of engaging with the external thread of the lens is formed on the internal wall of a lens barrel. The action of the engagement of the lens barrel and lens moves this lens. An external thread capable of engaging with the internal thread of the rotor is formed on the external wall of the lens barrel. The action of the engagement of the lens barrel and rotor drives so as to adjust the focus. COPYRIGHT: (C)2008,JPO&INPIT
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