Abstract: A lens barrel capable of keeping a stable zoom operation, increasing magnification of an image pickup apparatus with a simple configuration, and decreasing a camera thickness. A lens barrel is moved in an optical axis direction between a taking position and a retracted position to change magnification. A lens holding member holds a lens and has a follower part. A rectilinear movement regulating member regulates relative rotation of the lens holding member and has a convex part at an outside and a rectilinear rib at an image surface side than the convex part. A cam barrel has a cam groove for engaging the follower part and a groove for engaging the convex part formed on an inner surface. The cam barrel has a cam piece extended to the image surface side, a part of the cam groove is formed on an inner surface of the cam piece.

Abstract: A lens barrel which is capable of retracting a retractable lens group by a simple construction and realizing stable image quality. The lens barrel has a lens, a first lens holding member that holds the lens, a second lens holding member that holds the first lens holding member and moves in a direction of an optical axis in conjunction with the first lens holding member, a drive mechanism that moves the first lens holding member between a shooting position on the optical axis and a retracted position outside the optical axis, and a first guide bar and a second guide bar. The drive mechanism retracts the first lens holding member from the shooting position to the retracted position while holding the second lens holding member on the optical axis. The first and second guide bars guide the second lens holding member in the direction of the optical axis.

Abstract: A lens barrel which is capable of increasing zoom rate and slimming down a lens barrel, and by extension an image pickup apparatus while reducing the size of the lens barrel in a radial direction without decreasing the lens diameter of a retractable lens which retracts outwardly in a radial direction when the lens barrel is collapsed. A first lens holding frame holds a first lens, and a second lens holding frame holds a second lens. The first lens holding frame follows a cam groove, which is formed in a cam cylinder, to move in a direction of an optical axis. In a shooting state, the second lens is disposed on the optical axis. In a retracted state, the second lens is disposed at a position retracted outwardly in a radial direction from the center of the optical axis and on a rear surface of the cam cylinder.

Abstract: A zoom lens barrel capable of decreasing a distance between a lens and a diaphragm in an optical axis direction to thereby increase the photographing magnification and at the same time to reduce the lens barrel size, and capable of changing a diaphragm aperture diameter according to zoom control. The lens barrel has a lens relatively movable toward and away from an iris diaphragm in the optical axis direction with a change in the photographing magnification. An operation of the iris diaphragm is controlled in such a manner that a minimum diameter of an aperture of diaphragm blades of the iris diaphragm changes according to an amount of intrusion of a part of the lens into the aperture of the diaphragm blades in a range where the diaphragm blades do not interfere with the lens.

Abstract: Lens barrel capable of increasing shooting magnification while being miniaturized. A first lens group is caused to move in a direction of an optical axis by rotation of a second cam ring following rotation of a drive ring which has a focus cam groove on an inner periphery and is disposed on an outer periphery of a fixed cam ring having a cam groove and a rectilinear groove on an inner periphery. A second cam groove is disposed behind the first lens group in the direction of the optical axis. Rotation of the drive ring causes a follower of a focus group holding unit, which holds the second lens group, to follow the focus cam groove while being guided to move rectilinearly by the rectilinear groove. The follower following the focus cam groove causes the focus group holding unit to move in the direction of the optical axis.

Abstract: A lens apparatus includes a first lens barrel member and a second lens barrel member coupled with the first lens barrel member via a cam mechanism. The first lens barrel member includes a stopper portion and a gear portion. The stopper portion comes into contact with a first contact surface formed in the second lens barrel member, when the first lens barrel member protruding from the second lens barrel member in the optical axis direction receives the external force from a front end side of the first lens barrel member in its protruding direction, to restrict a displacement of the first lens barrel member with respect to the second lens barrel member due to the external force. The gear portion comes into contact with a second contact surface formed in the second lens barrel member to restrict the displacement due to the external force.

Abstract: A lens barrel which can increase the relative movement interval of lens units in the direction of an optical axis without increasing the dimension of a translating cylinder, which inhibits the rotation of the lens units, in the direction of the optical axis. The movement of a second lens unit holding second group lenses is switched from linear guide by a first translating guide unit to linear guide by a second translating guide unit when the second lens unit moves in a direction relatively away from a first lens unit holding first group lenses.

Abstract: The optical apparatus includes a base member, a shift member holding an image stabilizing lens and movable in a direction orthogonal to an optical axis direction of the optical apparatus with respect to the base member, a biasing member biasing the shift member toward the base member in the optical axis direction, and an aperture stop unit disposed on a side opposite to the base member with respect to the shift member and adjusting an amount of light. The aperture stop unit includes a displacement preventing portion which makes contact with the shift member to prevent the shift member from being displaced toward the aperture stop unit.

Abstract: A lens barrel that can realize increased shooting magnification and slimming down of an image pickup apparatus without increasing drive load and optical accuracy error in driving the lens barrel along an optical axis. A cam follower follows cam grooves in a cam cylinder to move along the optical axis, and engages with a lens holding frame to move the same from a retracted state to a shooting state. A compression coil spring urges the cam follower and the lens holding frame in such a direction as to draw them away from each other, and when the cam follower moves from the shooting state to the retracted state, engages with the lens holding frame to move the same toward an image plane. A fixed portion coming into abutment with the lens holding frame restricts movement of the lens holding frame toward the image plane.

Abstract: A lens apparatus includes a first lens unit and a second lens unit each of which is configured to move in an optical axis direction, a first cam tube that includes a first cam part and a second cam part respectively on an outer circumferential surface and an inner circumferential surface and moves the first and second lens units respectively in the optical axis direction using the first and second cam parts as the first cam tube rotates around an optical axis, and a linearly moving guide tube that is arranged on an inner circumferential side of the first cam tube and configured to guide the first and second lens units in the optical axis direction.

Abstract: A lens barrel that enables to increase a degree of freedom for selecting positions of grooves on a cam barrel. A lens holding member holds a lens and has a follower part. A rectilinear barrel regulates relative rotation of the lens holding member and has a bayonet convex part. The cam barrel has a cam groove with which the follower part engages and a bayonet groove with which the bayonet convex part engages. The positional relationship between the cam barrel and the rectilinear barrel in the optical axis direction is regulated because the bayonet convex part contacts the wall surfaces of both sides of the bayonet groove in a WIDE position, and because a section between a wall surface of the bayonet groove and the end face of the cam barrel is pinched between the bayonet convex part and a member provided in the rectilinear barrel in a TELE position.

Abstract: A zoom lens barrel capable, even if it has an image shake correction mechanism and a diaphragm mechanism, of decreasing a distance between lens groups of a photographing optical system of the lens barrel, whereby the lens barrel size can be reduced and the magnification can be increased, and capable of preventing a collision between diaphragm blades of the diaphragm mechanism and the lens groups from occurring when vibration, impact, or the like is applied to the lens barrel. When apart of an image shake correction lens intrudes into an aperture of diaphragm blades, a restricted portion of a lens holding member and a restricting portion of a diaphragm restrict a maximum movement of the lens holding member in a direction perpendicular to the optical axis, thereby restricting a maximum amount of movement of the image shake correction lens in the direction perpendicular to the optical axis.

Abstract: A zoom lens barrel capable of decreasing a distance between a lens and a diaphragm in an optical axis direction to thereby increase the photographing magnification and at the same time to reduce the lens barrel size, and capable of changing a diaphragm aperture diameter according to zoom control. The lens barrel has a lens relatively movable toward and away from an iris diaphragm in the optical axis direction with a change in the photographing magnification. An operation of the iris diaphragm is controlled in such a manner that a minimum diameter of an aperture of diaphragm blades of the iris diaphragm changes according to an amount of intrusion of a part of the lens into the aperture of the diaphragm blades in a range where the diaphragm blades do not interfere with the lens.

Abstract: A lens barrel which is capable of reducing, when the lens barrel is in a stored position, the thickness of an image pickup apparatus in its optical axis direction and also the diameter of the lens barrel. The lens barrel has a first lens, a second lens, a lens holding unit adapted to hold the second lens, and an iris diaphragm. The lens barrel moves between a photographing position and a stored position in the optical axis direction. The second lens includes a convex spherical portion protruding toward the first lens. The second lens is arranged close to the first lens and an inner circumferential portion of the diaphragm blades is arranged inwardly in the radial direction with respect to the lens holding unit and oppositely to the convex spherical portion in the radial direction, when the lens barrel is in the stored position.

Abstract: The imaging apparatus holds an imaging element that converts a subject image that has been formed by an imaging optical system to an electric signal by a holding member. An optical member is disposed more toward the subject side than the imaging element and is installed on the holding member. A sealing member that is formed by an elastic material encloses the light receiving surface of the imaging element as a countermeasure for dust protection. A position restricting member provided on the sealing member carries out positioning by being inserted between the outer peripheral edge portion of the optical member and the holding member in a direction perpendicular to the optical axis of the imaging optical system.

Abstract: An apparatus included in a lens barrel, includes a base member, a first lens unit which is movable in a direction perpendicular to an optical axis of the first lens, a second lens unit, attached to the first lens unit, and movable in a direction perpendicular to an optical axis of the second lens, and a plurality of rolling members sandwiched between the base member and the first lens unit, wherein a gap between the first lens unit and the second lens unit is adjustable, and wherein the gap between the first lens unit and the second lens unit is smaller and a gap between the first lens unit and the base member is larger in the photographable state as compared to the retracted state, and the rolling members do not contact the base member or the first lens unit in the retracted state.

Abstract: A lens barrel that causes base portions of cam followers in a first optical member and a second optical member to follow a single straight-ahead movement guide groove along an optical axis even when circumferential phases of the cam followers are staggered, so that the optical members can move straight ahead while being inhibited from rotating. The base portion of the cam follower of one of the first optical member and the second optical member has a slide portion that is guided along both inner wall surfaces of a straight-ahead movement guide groove which face each other in a circumferential direction of a straight-ahead moving cylinder. The slide portion has a guide surface that guides the base portion of the cam follower of the other one of the first optical member and the second optical member in the direction of the optical axis.

Abstract: A lens barrel which can increase the relative movement interval of lens units in the direction of an optical axis without increasing the dimension of a translating cylinder, which inhibits the rotation of the lens units, in the direction of the optical axis. The movement of a second lens unit holding second group lenses is switched from linear guide by a first translating guide unit to linear guide by a second translating guide unit when the second lens unit moves in a direction relatively away from a first lens unit holding first group lenses.

Abstract: A lens apparatus includes a first lens barrel member and a second lens barrel member coupled with the first lens barrel member via a cam mechanism. The first lens barrel member includes a stopper portion and a gear portion. The stopper portion comes into contact with a first contact surface formed in the second lens barrel member, when the first lens barrel member protruding from the second lens barrel member in the optical axis direction receives the external force from a front end side of the first lens barrel member in its protruding direction, to restrict a displacement of the first lens barrel member with respect to the second lens barrel member due to the external force. The gear portion comes into contact with a second contact surface formed in the second lens barrel member to restrict the displacement due to the external force.

Abstract: A lens barrel capable of, in a housed state of the photographing lens barrel, making an image pickup apparatus more compact than the conventional image pickup apparatuses, while protecting an image pickup element from harmful light. The lens barrel comprises a lens holding section adapted to hold a lens, a dimming filter adapted to be retractable to reduce light from an object, a shutter adapted to be opened and closed to shield the light from the object, and a control unit adapted to control the movement of the lens holding section, the dimming filter and the shutter. The control unit is adapted, in a non-image-pickup state, to close the shutter and to retreat the dimming filter, and adapted to move the lens or the lens holding section to a space formed by retreating of the dimming filter.