| 摘要 |
A linear-motion helicoid mechanism for a CCTV camera, comprising a lens frame for holding lenses, a key member, a helicoid female member and a rotating frame that is formed integrally with the helicoid female member. The lens frame comprises a cylindrical lens holder having helicoids and keyways on an outer periphery of the cylinder. The key member comprises a cylindrical part having keys for engagement with the keyways provided on the key member. The helicoid female member comprises a cylindrical part having helicoids that engage with the helicoids of the helicoid female member. The rotating frame and the helicoid female member are engaged together with a bayonet mechanism, so that the rotating frame fixes a position of the helicoid female member to the key member in the optical axis direction and supports it rotatably about the optical axis.
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