Canon Kabushiki Kaisha

Keiichi Yasuda

Masao Aoyagi

Ryuji Suzuki

Shigeru Kamata

Hiroshi Furukawa

Kazufumi Kobayashi

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.

Lens barrel

A built-in motorized lens mounting includes a fixed tube, a zoom actuating ring axially movably supported relative to the fixed tube, a focusing lens holder movably supported at least in the axial direction relative to the zoom actuating ring, an electric motor fixedly secured to the zoom actuating ring, and a driving power transmitting system using the rotation of the motor as a drive source to move the lens holder axially relative to the zoom actuating ring.

Lens mounting

Lens barrel with internal motor focusing

In the disclosed mechanical mounting for a zoom lens, a body tube and a single actuator barrel are provided with an intermediate sleeve therebetween, and a variator lens cell and a rotary ring are arranged inside the body tube, whereby a driving torque for the variator lens cell is transmitted from the intermediate sleeve to the rotary ring.

Growing community of inventors

Tokyo, Japan

Keiichi Yasuda