Lens barrel
AssigneeOlympus Optical Co., Ltd.
InventorsTakaaki Ue, Ai Midorikawa
Life of this patent
Estimating the term…
Abstract
An external helicoid thread comprises a helicoid thread composed of a first ridge whose both flanks are formed at a first flank angle, and a helicoid thread composed of second ridge whose both flanks are formed at a second flank angle, which is different from the first flank angle; and an internal helicoid thread is kept in screwed-state engagement with the external helicoid thread. In a lens barrel obtained using a connection based on such helicoid threads, the connection provided by these helicoid threads can thereby remain secured even if a sudden outside force is applied to the lens barrel.
Claims19
A lens barrel, comprising:
- a first frame provided with helicoid threads comprising two types of ridges, representing a first helicoid thread composed of a ridge in which both flanks of the ridge are formed at a first flank angle, and a second helicoid thread composed of a ridge in which both flanks of the ridge are formed at a second flank angle, which is different from said first flank angle;
- and
- a second frame provided with helicoid threads in screwed-state engagement with said first helicoid thread on said first frame and with said second helicoid thread on said first frame.
A lens barrel, comprising:
- an external helicoid thread frame equipped with a first external helicoid thread having a first flank angle, and a second external helicoid thread having a second flank angle, which is different from said first flank angle;
- and
- an internal helicoid thread frame equipped with a first internal helicoid thread in screwed-state engagement with said first external helicoid thread, and a second internal helicoid thread in screwed-state engagement with said second internal helicoid thread.
Dependencies are inferred from the claim text.