Lens barrel with internal motor focusing
AssigneeCanon Kabushiki Kaisha
InventorsRyuji Suzuki, Masao Aoyagi, Shigeru Kamata, Keiichi Yasuda, Hiroshi Furukawa
Life of this patent
Estimating the term…
Abstract
A lens barrel includes a stationary tube secured to the inner side of a stationary lens barrel member with a given space kept between them, and a motor disposed within the space. A helicoidal surface is arranged along the inner circumference of the stationary tube to be in screwed engagement with the helicoidal surface of a lens-carrying frame arranged to carry lenses which are shiftable in the direction of their optic axis, and a connecting member extends to the inner circumference of the stationary tube to cause the rotation of a rotary tube which has a toothed part engaging the output gear of the motor to be transmitted to the lens-carrying frame.
Claims14
A lens barrel comprising:
- a stationary tube secured to an inner side of a stationary lens barrel member with a predetermined space kept between said stationary tube and said stationary lens barrel member;
- a motor arrangement disposed within said predetermined space;
- a first helicoidal surface formed on an inner circumferential side of said stationary tube;
- a second helicoidal surface formed on a lens carrying frame which is arranged to carry and shift movable lenses in the direction of the optic axis of said lenses, said second helicoidal surface being in screwed engagement with said first helicoidal surface;
- a rotary tube arranged in between said lens barrel member and said stationary tube to be rotatable by the rotation output of said motor arrangement;
- and
- a transmission member arranged to transmit therethrough the rotation of said rotary tube to said lens carrying frame and to cause said lens carrying frame to move in the direction of the optic axis by rotating said lens carrying frame with the rotation output of said motor arrangement.
A lens barrel, comprising:
- a stationary tube secured to an inner side of a stationary lens barrel member with a predetermined space kept between said stationary tube and said stationary lens barrel member;
- a motor arrangement disposed within said predetermined space;
- a first helicoidal surface formed on an inner circumferential side of said stationary tube;
- a second helicoidal surface formed on a lens shifting cylindrical member which is arranged to carry and shift movable lenses in the direction of the optic axis of said lenses, said second helicoidal surface being in screwed engagement with said first helicoidal surface;
- a rotary tube arranged at least inside of said lens barrel member to be rotatable by the rotation output of said motor arrangement;
- and
- a transmission member arranged to transmit therethrough the rotation of said rotary tube to said lens shifting member and to cause said lens shifting member to move in the direction of said optic axis by rotating said lens shifting member with the rotation output of said motor arrangement.
A lens barrel, comprising:
- a stationary lens barrel member;
- a stationary tube and a light shielding tube arranged away from each other in the direction of an optic axis with a predetermined space kept between an inner side of said stationary lens barrel member and each of said stationary tube and said light shielding tube;
- a motor arrangement disposed within said predetermined space, said motor arrangement including a motor body which is disposed on an outer circumferential side of said light shielding tube and an output gear which is disposed on an outer circumferential side of said stationary tube;
- a first helicoidal surface formed on an inner circumferential side of said stationary tube;
- a second helicoidal surface formed on a lens carrying frame which is arranged to carry and shift movable lenses in the direction of the optic axis of said lenses, said second helicoidal surface being in screwed engagement with said first helicoidal surface;
- a gear tube which engages the output gear of said motor arrangement and is arranged to be rotated by the rotation of said output gear;
- and
- a transmission member arranged to transmit therethrough the rotation of said gear tube to said lens carrying frame and to cause said lens carrying frame to shift in the direction of said optic axis by causing said lens carrying frame to be rotated by the rotation of said output gear of said motor arrangement.
Dependencies are inferred from the claim text.