Rotatably controllable lens hood and cover unit

Details Rotatably controllable lens hood and cover unit Rotatably controllable lens hood and cover unit

1991-12-20

1994-03-15

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

359511, 359612, G03B 1104, G02B 700

Patent

active

052949540

ABSTRACT:
A cover unit for lens unit having a lens barrel, which has a cylindrical support member to be coupled to an end of the lens barrel, at least one engaging pin member is provided at a predetermined position on the outer circumferential surface thereof. Further, the cover unit has a cylindrical hood member capable of being superposed on the lens barrel, at least one cam groove to slidably receive the at-least-one engaging pin member therein being formed on the inner circumferential surface of the hood member, wherein by means of the engagement of the at-least-one engaging pin member with the at-least-one cam groove, the hood member moves in its axial direction relative to the support member upon rotation of the hood member relative to the support member. Lens barriers are supported by the support member for covering the end of the lens barrel, the lens barrier means being openable. The lens barriers are driven in accordance with the movement of the hood member.

REFERENCES:
patent: 4002402 (1977-01-01), Mito
patent: 4384767 (1983-05-01), Kawai
patent: 5126881 (1992-06-01), Crema

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