Abstract: A lens barrel that is capable of miniaturizing and thinning an image pickup apparatus by enabling to switch manual lens drive and electric lens drive with a simple mechanism. A lens barrel is mounted on an image pickup apparatus that supports an operation member rotatably. A drive barrel engages with a lens holding member to drive it in an optical axis direction. A motor transfers rotation to the drive barrel through a transfer mechanism. A switching mechanism switches between electric lens drive that drives the lens holding member by transferring rotation of the motor to the drive barrel and manual lens drive that drives the lens holding member by transferring rotation of the operation member to the drive barrel via an elastic member that rotates together with the operation member according to a user's operation. The drive barrel engages with the elastic member while shifting to a photographing area.

Abstract: A lens barrel that is capable of miniaturizing and thinning an image pickup apparatus by enabling to switch manual lens drive and electric lens drive with a simple mechanism. A lens barrel is mounted on an image pickup apparatus that supports an operation member rotatably. A drive barrel engages with a lens holding member to drive it in an optical axis direction. A motor transfers rotation to the drive barrel through a transfer mechanism. A switching mechanism switches between electric lens drive that drives the lens holding member by transferring rotation of the motor to the drive barrel and manual lens drive that drives the lens holding member by transferring rotation of the operation member to the drive barrel via an elastic member that rotates together with the operation member according to a user's operation. The drive barrel engages with the elastic member while shifting to a photographing area.

Abstract: A lens barrel that is capable of miniaturizing and thinning an image pickup apparatus by enabling to switch manual lens drive and electric lens drive with a simple mechanism. A lens barrel is mounted on an image pickup apparatus that supports an operation member rotatably. A drive barrel engages with a lens holding member to drive it in an optical axis direction. A motor transfers rotation to the drive barrel through a transfer mechanism. A switching mechanism switches between electric lens drive that drives the lens holding member by transferring rotation of the motor to the drive barrel and manual lens drive that drives the lens holding member by transferring rotation of the operation member to the drive barrel via an elastic member that rotates together with the operation member according to a user's operation. The drive barrel engages with the elastic member while shifting to a photographing area.

Abstract: A lens barrel capable of maintaining a pivot regulating function of the lens holder even if a forceful impact is received from outside. A lens holder holds a lens and is movable in an optical axis direction. A fixing member supports both ends of a first guide shaft for guiding the lens holder in the optical axis direction and supports a second guide shaft in a cantilever manner. The second guide shaft is shorter than the first guide shaft and regulates a pivot of the lens holder on the first guide shaft by engaging with the lens holder. A pivot regulating mechanism is disposed between a wall portion of the fixing member that supports one end of the first guide shaft and the lens holder. The mechanism regulates the pivot of the lens holder in a case where engagement between the lens holder and the second guide shaft is released.

Abstract: A lens barrel that is capable of miniaturizing and thinning an image pickup apparatus by enabling to switch manual lens drive and electric lens drive with a simple mechanism. A lens barrel is mounted on an image pickup apparatus that supports an operation member rotatably. A drive barrel engages with a lens holding member to drive it in an optical axis direction. A motor transfers rotation to the drive barrel through a transfer mechanism. A switching mechanism switches between electric lens drive that drives the lens holding member by transferring rotation of the motor to the drive barrel and manual lens drive that drives the lens holding member by transferring rotation of the operation member to the drive barrel via an elastic member that rotates together with the operation member according to a user's operation. The drive barrel engages with the elastic member while shifting to a photographing area.

Abstract: A lens barrel capable of maintaining a pivot regulating function of the lens holder even if a forceful impact is received from outside. A lens holder holds a lens and is movable in an optical axis direction. A fixing member supports both ends of a first guide shaft for guiding the lens holder in the optical axis direction and supports a second guide shaft in a cantilever manner. The second guide shaft is shorter than the first guide shaft and regulates a pivot of the lens holder on the first guide shaft by engaging with the lens holder. A pivot regulating mechanism is disposed between a wall portion of the fixing member that supports one end of the first guide shaft and the lens holder. The mechanism regulates the pivot of the lens holder in a case where engagement between the lens holder and the second guide shaft is released.

Abstract: A lens barrel includes a first blade member, a second blade member provided at an object side of the first blade member and overlapped with at least part of the first blade member in an optical axis direction, a drive unit configured to perform an opening and closing drive of the first blade member and the second blade member, and a biasing member configured to apply a biasing force to the drive unit, the biasing member is disposed in a direction orthogonal to an optical axis with respect to the first blade member, and the biasing member is disposed so as to overlap with at least part of the second blade member in the optical axis direction during an opening and closing operation of the second blade member.

Abstract: An optical apparatus includes an image stabilizer configured to drive a first optical member in a direction perpendicular to an optical axis and to stabilize an image, a light amount adjuster that includes a plurality of blades, and is configured to change a diameter of an aperture configured to transmit a light flux, by rotating the blades, a driver configured to drive the light amount adjuster in the direction perpendicular to the optical axis, and a controller configured to control a driving amount of the driver in accordance with a driving amount of the image stabilizer. The controller drives the image stabilizer and the light amount adjuster in equal directions.

Abstract: A lens barrel includes a first blade member, a second blade member provided at an object side of the first blade member and overlapped with at least part of the first blade member in an optical axis direction, a drive unit configured to perform an opening and closing drive of the first blade member and the second blade member, and a biasing member configured to apply a biasing force to the drive unit, the biasing member is disposed in a direction orthogonal to an optical axis with respect to the first blade member, and the biasing member is disposed so as to overlap with at least part of the second blade member in the optical axis direction during an opening and closing operation of the second blade member.

Abstract: An optical apparatus includes a first optical member (10) on which a concave curved surface is formed, a second optical member (20) on which a convex curved surface is formed, and a light amount adjuster (23) that includes a plurality of blade members (233) each having a convex curved shape portion and that changes size of an aperture to pass a light beam by a rotation of the blade members (233), the first and second optical members are disposed side by side in an optical axis direction so that the concave curved surfaces of the first and second optical members face each other, the light amount adjuster is disposed between the first and second optical members, and a radius of curvature of the convex curved shape portion of the blade member is smaller than that of the first optical member and is larger than that of the second optical member.

Abstract: An optical apparatus includes an image stabilizer configured to drive a first optical member in a direction perpendicular to an optical axis and to stabilize an image, a light amount adjuster that includes a plurality of blades, and is configured to change a diameter of an aperture configured to transmit a light flux, by rotating the blades, a driver configured to drive the light amount adjuster in the direction perpendicular to the optical axis, and a controller configured to control a driving amount of the driver in accordance with a driving amount of the image stabilizer. The controller drives the image stabilizer and the light amount adjuster in equal directions.

Abstract: An image pickup apparatus which makes it possible to form a multi-stage retractable lens barrel permitting the amount of extension of the lens barrel to be set as desired. A first intermediate rotary barrel fitted, for rotation, on a first intermediate rectilinear motion barrel restrained from rotation about an optical axis. A second intermediate rectilinear motion barrel is rectilinearly guided by the first intermediate rectilinear motion barrel. A second intermediate rotary barrel is fitted on the second intermediate rectilinear motion barrel and engaged with the first intermediate rotary barrel, rotation. The first intermediate rectilinear motion barrel has a cam groove formed on an inner peripheral surface thereof, for engagement with the second intermediate rotary barrel to cause the same to move along the optical axis.

Abstract: A lens barrel that is capable of reducing a size and cost by omitting an actuator only for diaphragm blades, and of preventing a change of a diaphragm aperture due to a variation in a part accuracy of a mechanism that drives diaphragm blades. Diaphragm blades have cam engagement parts, respectively. A holding member holds the diaphragm blades so as to be rotatable in directions to open and close an aperture. An energizing member energizes the diaphragm blades in a direction to open or close the aperture. A moving member has cam surfaces that engage with the cam engagement parts, and moves in an optical axis direction to operate the diaphragm blades by cam actions between the cam engagement parts and the cam surfaces against energizing force of the energizing member. Regulation parts regulate the operations of the diaphragm blades by the energizing force of the energizing member.

Abstract: A reliable barrier device for a camera, which is able to smoothly open and close blade members while suppressing a drive load applied when the blade members are opened and closed. Closing springs for primary and secondary blades are each interposed between corresponding ones of spring hooks on a barrier drive ring and on primary and secondary blade members. When the drive ring is rotated in a barrier opening direction, the distance between the spring hook on the ring and the spring hook for primary blade decreases and the urging force of the closing spring for primary blade decreases, which reduces a rotational torque produced by the closing springs for primary and secondary blades at barrier open state, making it possible to decrease a rotational torque produced by opening springs and acting on the drive ring at barrier open state.

Abstract: A lens barrel unit includes a holder configured to hold a lens, a cam cylinder including a cam groove configured to engage with the holder and define a movement of the holder in an optical axis direction, and a projection that has a part of the cam groove and projects in the optical axis direction, and a straightforward movement cylinder configured to guide a straightforward movement of the holder, the straightforward movement cylinder including a flange forming a notch. In a process from a retraction state in which the projection is located in the notch to an image pickup state in which the projection is located outside of the notch, the straightforward movement cylinder moves relative to the cam cylinder in the optical axis direction.

Abstract: A lens barrel that is capable of reducing a size and cost by omitting an actuator only for diaphragm blades, and of preventing a change of a diaphragm aperture due to a variation in a part accuracy of a mechanism that drives diaphragm blades. Diaphragm blades have cam engagement parts, respectively. A holding member holds the diaphragm blades so as to be rotatable in directions to open and close an aperture. An energizing member energizes the diaphragm blades in a direction to open or close the aperture. A moving member has cam surfaces that engage with the cam engagement parts, and moves in an optical axis direction to operate the diaphragm blades by cam actions between the cam engagement parts and the cam surfaces against energizing force of the energizing member. Regulation parts regulate the operations of the diaphragm blades by the energizing force of the energizing member.

Abstract: An image pickup apparatus which makes it possible to achieve reduction of the size in the optical axis direction thereof, and easily maintain the accuracy of rectilinear guidance between lenses. A cam barrel rotatable around an optical axis has a cam for controlling motion of a lens unit along the optical axis. A rectilinear motion guide unit rectilinearly guides the lens unit. The rectilinear motion guide unit has a rectilinear motion barrel fitted in the cam barrel for rectilinearly guiding the lens unit, and a rectilinear motion member that is rectilinearly guided by a rectilinear motion guide member disposed around the rectilinear motion barrel and is connected to the rectilinear motion barrel. The cam barrel is sandwiched from front and rear in a direction along the optical axis by the rectilinear motion guide unit, and is movable together therewith along the optical axis.

Abstract: A lens barrel unit includes a lens holding cylinder, a cam cylinder, and a straightforward movement cylinder. The lens holding cylinder includes a ring-shaped step that projects outward in a radial direction. In an image pickup state, a surface of the ring-shaped step which is an end of an object side in the ring-shaped step is closer to an object than a surface of the straightforward movement cylinder which is an end of an object side in the straightforward movement cylinder.

Abstract: A lens barrel unit includes a holder configured to hold a lens, a cam cylinder including a cam groove configured to engage with the holder and define a movement of the holder in an optical axis direction, and a projection that has a part of the cam groove and projects in the optical axis direction, and a straightforward movement cylinder configured to guide a straightforward movement of the holder, the straightforward movement cylinder including a flange forming a notch. In a process from a retraction state in which the projection is located in the notch to an image pickup state in which the projection is located outside of the notch, the straightforward movement cylinder moves relative to the cam cylinder in the optical axis direction.

Abstract: A lens barrel unit includes a lens holding cylinder, a cam cylinder, and a straightforward movement cylinder. The lens holding cylinder includes a ring-shaped step that projects outward in a radial direction. In an image pickup state, a surface of the ring-shaped step which is an end of an object side in the ring-shaped step is closer to an object than a surface of the straightforward movement cylinder which is an end of an object side in the straightforward movement cylinder.