Lens barrel

A lens barrel having a photographing lens, comprising:

• a first frame;
• a second frame;
• and
• a third frame;
• wherein said first frame directly transmits a driving force, which is generated by rotation thereof, to said second and third frames, thereby causing said second frame to move rectilinearly, so that said third frame undergoes rectilinear movement thereof, which is caused by said first frame, with respect to rectilinear movement of said second frame.

A lens barrel having a photographing lens, comprising:

• a first frame;
• a second frame;
• a third frame;
• first cam means provided between said first and second frames;
• second cam means provided between said second and third frames;
• and
• rotation transmission means provided between said first and second frames;
• wherein said third frame is driven in a rectilinear direction by a sum of a first component of movement, which is caused by an action of said first cam means in the rectilinear direction, and a second component of movement, which is caused by an action of said second cam means owing to a rotating operation of said rotation transmission means, in the rectilinear direction.

A lens barrel having a photographing lens, comprising:

• a first frame;
• a second frame;
• a third frame;
• first cam means, provided between said first and second frames, for moving said second frame at least in a direction of an optical axis of said photographing lens;
• second cam means, provided between said second and third frames, for moving said third frame at least in the direction of the optical axis;
• and
• rotation transmission means, provided between said first and third frames, for moving said second and third frames in the direction of the optical axis with said first cam means owing to rotation of said first frame and then moving said third frame in the direction of the optical axis still more with said second cam means.

A lens barrel having a photographing lens, comprising:

• a first frame;
• a second frame;
• a third frame;
• first cam means, provided between said first and second frames, for moving said second frame at least in a direction of an optical axis of said photographing lens;
• second cam means, provided between said second and third frames, for moving said third frame at least in the direction of the optical axis;
• and
• rotation transmission means, provided between said first and third frames, for moving said third frames in the direction of the optical axis by rotating said first frame and with said second cam means, wherein a force due to movement of said second frame caused by said first cam means in the direction of the optical axis is applied to said third frame.

A lens barrel comprising:

• a first frame;
• a second frame;
• a third frame;
• first cam means, provided between said first and second frames, for moving said second frame at least in a direction of an optical axis of a lens;
• second cam means, provided between said second and third frames, for moving said third frame at least in the direction of the optical axis;
• and
• rotation transmission means, provided between said first and third frames, for moving said second and third frames in the direction of the optical axis with said first cam means owing to rotation of said first frame and then moving said third frame in the direction of the optical axis still more with said second cam means.

A lens barrel comprising:

• a first frame;
• a second frame;
• a third frame;
• first cam means, provided between said first and second frames, for moving said second frame at least in a direction of an optical axis of a lens;
• second cam means, provided between said second and third frames, for moving said third frame at least in the direction of the optical axis;
• and
• rotation transmission means, provided between said first and third frames, for moving said third frames in the direction of the optical axis by rotating said first frame and with said second cam means;
• wherein the movement of said second frame, which is caused by said first cam means, in the direction of the optical axis is applied to said third frame.