Lens barrel
AssigneeOlympus Optical Co., Ltd.
InventorSatoru Yasutomi
Life of this patent
Estimating the term…
Abstract
Briefly, according to the present invention, a lens barrel includes: a first frame member having on the inner surface thereof a female helicoid and cam grooves each of which has substantially the same lead angle as that of the female helicoid and which is deeper than the female helicoid; and a second frame member which is placed inside the first frame member and which has a male helicoid, which is engaged with the female helicoid, and cam followers which are engaged with the cam grooves. The first frame member is rotated relative to the second frame member, resulting in forward or backward movement of the second frame member.
Claims20
A lens barrel comprising:
- a first frame member having on the inner surface thereof a female helicoid and a cam groove having substantially the same lead angle as that of the female helicoid, the cam groove being deeper than the female. helicoid;
- and
- a second frame member which is placed inside the first frame member and which has a male helicoid, which is engaged with the female helicoid, and a cam follower which is engaged with the cam groove;
- wherein
- the first frame member is rotated relative to the second frame member, resulting in forward or backward movement of the second frame member.
A lens barrel comprising:
- a first frame member having at least a first area in which a cam groove is formed, and at least a second area in which a segment of a female helicoid is formed, on the inner surface thereof, the female helicoid having substantially the same lead angle as that of the cam groove and having a groove depth shallower than the cam groove;
- and
- a second frame member having cam follower which is engaged with the cam groove and a male helicoid which is engaged with the female helicoid, wherein
- the first frame member is rotated relative to the second frame member, resulting in forward or backward movement of the second frame member.
A lens barrel comprising:
- a first frame member having on the inner surface thereof a female helicoid, first cam grooves each of which has substantially the same lead angle as that of the female helicoid and which is deeper than the female helicoid, and second cam grooves each of which has a lead angle different from that of the female helicoid and which is deeper than the female helicoid;
- a second frame member having a male helicoid which is engaged with the female helicoid and first cam followers which are engaged with the first cam grooves;
- and
- a third frame member having second cam followers which are engaged with the second cam grooves, wherein
- the first frame member is rotated relative to the second and third frame members, so that the second and third frame members are moved relative to the first frame member.
A lens barrel comprising:
- a first frame member having first areas, in each of which a first cam groove is formed, and second areas, in each of which a segment of a female helicoid and a second cam groove are formed, on the inner surface thereof, the female helicoid having substantially the same lead angle as that of the first cam groove, the second cam groove having a lead angle different from that of the first cam groove;
- a second frame member having cam followers which are engaged with the respective first cam grooves and a male helicoid which is engaged with the female helicoid;
- and
- a third frame member having second cam followers which are engaged with the respective second cam grooves, wherein
- each first cam groove is deeper than the female helicoid.
Dependencies are inferred from the claim text.