US 5,694,254 A · Lens barrel with a rotational motion transmitting portion

Abstract

A lens barrel including a lens holding cylinder holding a lens unit and rotatable about the optical axis of the lens barrel, and a holding cylinder rotating mechanism for rotatively moving the lens holding cylinder to thereby move the lens unit along the optical axis, the holding cylinder rotating mechanism having a rotatable portion disposed outside a fixed cylinder and effecting rotational motion, a rotational motion transmitting portion for transmitting only the rotational motion about the optical axis of the rotational motion of the rotatable portion to the inside of the fixed cylinder, and a holding cylinder rotating portion for transmitting the motion of the rotational motion transmitting portion along the direction of the optical axis and rotating the lens holding cylinder.

Claims5

Dependent claims

A lens barrel including:

a lens holding cylinder holding a lens unit and rotatable about the optical axis of said lens barrel;
and
a holding cylinder rotating mechanism for rotatively moving said lens holding cylinder to thereby move said lens unit along said optical axis;
said holding cylinder rotating mechanism having:
a rotating portion disposed outside a fixed cylinder having rotational motion;
a rotational motion transmitting portion for transmitting only the rotational motion about said optical axis of the rotational motion of said rotating portion to the inside of said fixed cylinder;
and
a holding cylinder rotating portions for transmitting the motion of said rotational motion transmitting portion along the direction of said optical axis and rotating said lens holding cylinder.

5 more elements

A lens barrel including:

a fixed cylinder;
a rotatable portion disposed outside said fixed cylinder and rotatable about the optical axis of said lens barrel;
an escape portion provided circumferentially of said fixed cylinder;
a rotational motion transmitting portion extending from said rotatable portion through said escape portion and radially toward said optical axis;
said rotational motion transmitting portion being rotatable about said optical axis, but immovable along said optical axis;
a holding cylinder rotating portion disposed inside said fixed cylinder and engaged with said rotational motion transmitting portion and rotatable with said rotatable portion;
said holding cylinder rotating portion having a rectilinear groove;
a cam ring rotatably disposed between said fixed cylinder and said holding cylinder rotating portion;
said cam ring having a cam slot;
a lens unit;
a lens holding cylinder holding said lens unit;
and
a cam pin fixed to said lens holding cylinder and extending through said rectilinear groove and engaged with said cam slot.

10 more elements

Dependencies are inferred from the claim text.

Lens barrel with a rotational motion transmitting portion

Life of this patent

Lens barrel with a rotational motion transmitting portion

Life of this patent

Abstract

Claims5