Camera with motor-driven lens barrel

A camera comprising:

• a movable barrel assembly holding a taking lens therein, and movable back and forth along an optical axis of the taking lens relative to a camera body;
• a barrel driving assembly including a drive ring, the drive ring being immovable in the direction of the optical axis and rotatable by a motor about the optical axis in one direction;
• and
• a cam mechanism interconnecting the barrel driving assembly and the movable barrel assembly such that the movable barrel assembly makes at least one stroke of reciprocative movement along the optical axis while the drive ring makes one revolution in said one rotational direction;
• wherein the movable barrel assembly comprises a rear movable barrel movable back and forth along the optical axis relative to the camera body while rotating about the optical axis, and a front movable barrel holding the taking lens and mounted in the rear movable barrel so as to be movable back and forth along the optical axis relative to the rear movable barrel, whereas the cam mechanism comprises a first cam mechanism interconnecting the rear movable barrel with the barrel driving assembly such that the rear movable barrel rotates together with the drive ring in said one rotational direction and makes at least one stroke of reciprocative movement along the optical axis per one revolution, and a second cam mechanism interconnecting the rear movable barrel and the front movable barrel such that the front movable barrel makes at least one stroke of reciprocative movement along the optical axis while the rear movable barrel makes one revolution.

A camera comprising:

• a movable barrel assembly holding a taking lens therein, and movable back and forth along an optical axis of the taking lens relative to a camera body;
• a barrel driving assembly including a drive ring, the drive ring being immovable in the direction of the optical axis and rotatable by a motor about the optical axis in one direction;
• and
• a cam mechanism interconnecting the barrel driving assembly and the movable barrel assembly such that the movable barrel assembly makes at least one stroke of reciprocative movement along the optical axis while the drive ring makes one revolution in said one rotational direction;
• wherein the drive ring may be manually rotated to set the taking lens in one of different focusing positions predetermined for covering respectively different subject distance zones.

A camera comprising:

• a movable barrel assembly holding a taking lens therein, and movable back and forth along an optical axis of the taking lens relative to a camera body;
• a barrel driving assembly including a drive ring, the drive ring being immovable in the direction of the optical axis and rotatable by a motor about the optical axis in one direction;
• a clutch mechanism interconnected between the drive ring and the motor, the clutch mechanism being switched over according to rotational direction of the motor, for transmitting the rotational power of the motor in the first direction to the drive ring and a rotational power of the motor in a second direction to a second mechanism of the camera;
• and
• a cam mechanism interconnecting the barrel driving assembly and the movable barrel assembly such that the movable barrel assembly makes at least one stroke of reciprocative movement along the optical axis while the drive ring makes one revolution in said one rotational direction;
• wherein the camera is an instant camera for taking a photograph on a sheet of instant film, and said second mechanism is a film feed out mechanism for feeding the instant film out of the camera body after each exposure.