Lens barrel
AssigneeOlympus Optical Co., Ltd.
InventorSatoru Yasutomi
Life of this patent
Estimating the term…
Abstract
A lens barrel is provided which includes a first frame member having on an inner surface thereof a female helicoid, and a cam groove which has substantially a same lead angle as a lead angle of the female helicoid and which is deeper than the female helicoid. A second frame member is placed inside the first frame member. The second frame member includes a male helicoid engaged with the female helicoid, and a cam follower engaged with the cam groove. The first frame member is rotatable relative to the second frame member, so as to cause forward or backward movement of the second frame member.
Claims20
A lens barrel comprising:
- a first frame member having on an inner surface thereof a female helicoid and a cam groove having substantially a same lead angle as a lead angle of the female helicoid, said cam groove being deeper than the female helicoid;
- and
- a second frame member which is placed inside the first frame member and which includes a male helicoid engaged with the female helicoid, and a cam follower engaged with the cam groove;
- wherein the first frame member is rotatable relative to the second frame member, so as to cause one of forward and backward movement of the second frame member.
A lens barrel comprising:
- a first frame member having on an inner surface thereof at least one first area in which a cam groove is formed, and at least one second area in which a segment of a female helicoid is formed, said female helicoid having substantially a same lead angle as a lead angle of the cam groove and having a groove depth shallower than a groove depth of 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 helicoids;
- wherein the first frame member is rotatable relative to the second frame member, so as to cause one of forward and backward movement of the second frame member.
A lens barrel comprising:
- a first frame member having on an inner surface thereof a female helicoid, first cam grooves each of which has substantially a same lead angle as a lead angle of the female helicoid and each of which is deeper than the female helicoid, and second cam grooves each of which has a lead angle different from the lead angle of the female helicoid and each of 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 rotatable relative to the second and third frame members, so as to cause the second and third frame members to be moved relative to the first frame member.
A lens barrel comprising:
- a first frame member having on an inner surface thereof 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, said female helicoid having substantially a same lead angle as a lead angle of the first cam groove, and said second cam groove having a lead angle different from the lead angle 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.