JP6435720B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel used for a digital still camera or the like, and more particularly, to a blur correction optical system for normally operating a lock mechanism of a blur correction device that corrects blur of a subject image mounted in the lens barrel. Regarding position adjustment.

  In general, in hand-held shooting with a camera, photographic image blur due to camera shake is likely to occur, particularly when a lens with a long focal length is used or when the shutter speed is slow, and the image quality of the photo is impaired. Therefore, various types of blur correction apparatuses have been proposed as means for preventing loss of image quality due to camera shake of a photographer.

  The general configuration of these blur correction apparatuses includes a correction lens that forms part of the imaging optical system, a blur correction unit that drives the correction lens, and a control unit that controls the operation of the blur correction unit. Blur correction is performed by driving the correction lens in a direction that cancels camera vibration caused by the above.

  Such a blur correction device is known to have a lock mechanism for fixing the correction optical means when the blur correction is not started. By providing the lock function, it is possible to solve the problem that the lens barrel and the correction lens collide with each other when the lens barrel is carried and noise and damage occur. The lock mechanism is mainly provided in two types of configurations.

  One is a ring-shaped locking mechanism that fixes the correction lens to the inner peripheral surface of the locking mechanism by rotating a predetermined angle about the optical axis. This type of locking mechanism is disclosed in Patent Document 1, for example.

  The other is a lock mechanism that has a perforated portion in the correction optical means and realizes fixing by loosely inserting a rod-shaped lock member from a fixing member that does not move freely in the shake correction device. This type of locking mechanism is disclosed in Patent Document 2, for example.

  Incidentally, a lens barrel used in a digital still camera is generally required to be downsized and quiet. In the former lock mechanism, the number of parts increases, and it is necessary to mount a powerful actuator to perform angular rotation. Such a situation is undesirable because it causes an increase in the size of the lens barrel and noise generation. Therefore, recently, the latter lock function is being adopted.

  However, in the latter locking mechanism, there is a possibility that the loose insertion fails just by causing a slight deviation between the perforated part and the rod-shaped locking member, and the locking operation cannot be realized. Therefore, in order to perform a reliable locking operation, it is necessary to adjust the positional relationship between the perforated portion and the rod-shaped locking member. Such position adjustment is generally performed as a step in manufacturing a product.

  For example, Patent Document 3 discloses a position adjustment process of the blur correction optical system in the latter lock mechanism. According to the invention disclosed in Patent Document 3, a blur correction optical system that corrects blur by moving, a blur correction actuator that drives the blur correction optical system, and the blur correction optical system are provided integrally. A first locking portion is engaged with the first locking portion within an engageable range having a movable margin, and the blur correction optical system is fixed or the movement of the blur correction optical system is limited. An engaging portion, a storage portion for storing a substantially center position of the engageable range in which the first engaging portion and the second engaging portion can be engaged, and the first engaging portion. And a control unit that controls the driving of the shake correction actuator based on the position stored in the storage unit when the second locking unit is engaged with the second locking unit.

  According to Patent Document 3, the perforated portion and the rod-shaped lock member are brought into contact at one end, the position is stored as the first position, and the contact is made at the other end, and the position is stored as the second position. Based on the stored first position and second position, the center position of the perforated part is calculated.

According to the above-described position adjustment process, when the shake correction optical system is locked at a desired position and when it is unlocked, a large dedicated actuator is not required, and a small space, power saving, and a short time are required. A reliable locking operation and unlocking operation can be performed.

JP-A-10-26782 JP-A-6-67274 JP 2002-099017 A

  However, in the position adjustment process configured as shown in Patent Document 3, contact between the perforated portion and the rod-shaped lock member must be performed at two points, which causes an increase in time required for the position adjustment process. .

  Moreover, in the position adjustment process of a structure as shown to patent document 3, it is necessary to calculate a center position from a 1st position and a 2nd position. Therefore, it is necessary to add a process for calculating the center position to the manufacturing process, which causes a complicated manufacturing process.

  The present invention reduces the number of steps for obtaining the locking pin loose insertion position and simplifies the processing, thereby enabling a high-speed manufacturing process and a lens that can perform a reliable locking operation of the shake correction device. An object is to provide a lens barrel.

Invention, movably supported with the imaging optical system, a movable member which holds the correcting lens constituting a part of the imaging optical system, the movable member on the optical axis perpendicular to the plane shown in claim 1 a base member, a plurality of correction drive means for driving the movable member relative to the base member in different directions, position detecting means for detecting a position of said movable member on the optical axis perpendicular to the plane, a motion compensation device having said base member is held in a lock mechanism having a locking pin, a gentle interpolated pin driving means the locking pin in the locking hole provided in the movable member, a lock control circuit for controlling the locking operation by the locking pin, inserted loosely the locking pin into the locking hole, contacting the movable member and the locking pin is driven in a predetermined direction and said locking hole Detected by the optical axis A contact coordinate of said locking pin on the surface, a memory means for recording the maximum relative error amount calculated from the detection accuracy of the driving unevenness and the movable member of the locking pin, the locking pin Yuru挿coordinates obtained from , have a, the correction drive means, the arranged three on the optical axis perpendicular to the plane of the motion compensation device, the blur correction device, the three regulating portion for regulating the movable range of the movable member And one of the restricting portions is a fulcrum restricting portion that restricts the movable member only in a radial direction around the optical axis on a plane perpendicular to the optical axis, and the fulcrum restricting portion is an optical axis. The lens barrel is disposed at a substantially opposite position of the lock mechanism on a plane perpendicular to the optical axis with respect to the center.

  According to the present invention, the number of steps for obtaining the locking pin loose insertion position is reduced, the processing is simplified, and the manufacturing process can be speeded up. A lens barrel that can be obtained can be obtained.

It is the block diagram which showed the lens barrel which is one Embodiment of this invention. It is a perspective view of a shake correcting device viewed from the image plane side. It is an expansion | deployment perspective view of a blurring correction apparatus. It is the schematic of the blurring correction apparatus seen from the image surface side. It is the schematic of the movable range at the time of locking of a movable member. (I) It is the schematic which showed the locking hole controlled by the locking pin. (Ii) It is the schematic which showed the movable range of the center point of a movable member when the blurring correction apparatus is locked. (Iii) It is the schematic shown about the fulcrum and the fulcrum control part which controls it. It is the schematic of the movable range at the time of locking of a movable member seen from the image surface side. It is the schematic at the time of calculating | requiring a loose insertion coordinate. It is the schematic about drive variation. It is the schematic which showed the maximum relative error amount.

  The lens barrel 300 of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a lens barrel 300 of the present invention.

  The lens barrel 300 has a substantially cylindrical shape and includes the shake correction device 100 inside. This blur correction apparatus 100 constitutes a part of the imaging optical system of the lens barrel 300. The base member 121 of the shake correction apparatus is fixed in the lens barrel 300 so that the optical axis of the correction lens 111 of the shake correction apparatus 100 in the locked state coincides with the optical axis of the imaging optical system. .

  The lens barrel 300 is provided with a lock control circuit 311 connected to the blur correction device 100 and the lens CPU 301. The lens CPU is provided with a memory means 312, and information recorded in advance is read from the memory means 312 when the shake correction apparatus 100 is locked.

  FIG. 2 is a perspective view of the shake correction apparatus 100 as viewed from the image plane side, and FIG. 3 is a developed perspective view of the shake correction apparatus 100. The shake correction apparatus 100 has a substantially disk-shaped outer diameter, and a correction lens 111 that corrects image blur caused by vibration applied to the apparatus, a movable member 112 that holds the correction lens, and a base of the shake correction apparatus 100 A base member 121, correction driving means 161 provided at intervals of 120 ° on a circumference centered on the optical axis in a plane orthogonal to the optical axis of the correction lens 111, and a circuit board fixed to the base member 121 131 and the like.

  The movable member 112 includes a correction lens 111, a permanent magnet 113, and a back yoke 114, and is provided with a locking hole 201. The movable member 112 is provided with a movable yoke 115, and the base member 121 is provided with a circuit board 131. Hall elements (not shown) are mounted on the back side of each coil 132 mounted on the circuit board 131. The Hall element detects the position of the movable member 112 by detecting a change in magnetic flux density generated by the movement of the movable member 112. The movable member 112 has two protrusions 116 and one protrusion that are loosely inserted into the base member 121, and one protrusion functions as a fulcrum 117 that is restricted only in the radial direction.

  The coil 132 fixed to the base member 121 side via the circuit board 131 is configured to be sandwiched between a movable yoke 115 and a permanent magnet 113 that can move in a direction orthogonal to the optical axis via the movable member 112. ing. As a result, the correction driving means 161 that generates a driving force for driving the movable member 112 on a plane perpendicular to the optical axis is configured. The correction driving means 161 are provided at intervals of 120 ° on the circumference centered on the optical axis of the correction lens 111. The movable member 112 translates relative to the base member 121 according to the direction of the force generated by the three correction driving means 161. The movable member 112 can be moved to an arbitrary position by appropriately combining the driving by the three correction driving means 161.

  Further, between the movable member 112 and the base member 121, three steel balls 141 provided at intervals of 120 ° on the circumference centered on the optical axis in a plane orthogonal to the optical axis of the correction lens 111, and There is a saucer. Due to the presence of this steel ball, the movable member 112 can move smoothly with respect to the base member 121 on a plane perpendicular to the optical axis.

  FIG. 4 is a schematic view of the shake correction apparatus 100 viewed from the image plane side. The base member 121 is in a state in which the protrusion 116 of the movable member 112 is inserted, and has three restricting portions that restrict the movable range. Two of them are substantially elliptical restricting portions 211 and one is a fulcrum restricting portion 212 having an elongated hole shape. The elongated hole-shaped fulcrum restricting portion 212 restricts the movable member 112 only in the radial direction around the optical axis on a plane perpendicular to the optical axis. In addition, the shake correction apparatus 100 includes three correction drive units 161x, 161y, and 161z, and translates the movable member 112 in the X-axis, Y-axis, and Z-axis directions, respectively. A total of three restricting portions, that is, two restricting portions 211 and a fulcrum restricting portion 212, and three correction driving means 161 are provided on the base member 121 at intervals of 120 °, but are arranged without overlapping each other.

  Further, the base member 121 has a lock mechanism 151, and the lock mechanism 151 is disposed at a substantially opposite position as viewed from the fulcrum restricting portion 212 on a plane perpendicular to the optical axis centered on the optical axis. The lock mechanism 151 realizes a lock operation by loosely inserting the locking pin 202 into the locking hole 201 in the optical axis direction according to a command from the lock control circuit 311. At this time, the locking pin 202 is moved by a locking pin driving means (not shown). The locking pin driving means is generally a small actuator, but the type is not limited.

  5, FIG. 6, FIG. 7, FIG. 8 and FIG. 9 show a method for obtaining the locking pin loose insertion coordinates inside the locking hole 201 at the time of factory shipment. In order to obtain the loose insertion coordinates, first, the contact coordinates of the locking pin 202 and the locking hole 201 are detected, and then the gentle insertion coordinates are obtained from the contact coordinates.

  First, a method for detecting the contact coordinates between the locking pin 202 and the locking hole 201 will be described. FIG. 5 is a schematic view illustrating the movable range when the movable member 112 is locked. When the shake correction apparatus 100 is locked, the movable range of the movable member 112 is restricted by the locking pin 202. FIG. 5 (i) shows the locking hole 201 regulated by the locking pin 202. The outer shape of the range that can be taken by the center point of the locking hole 201 is circular. The movable range of the locking hole 201 is indicated by a solid arrow in the front-rear direction and a dotted arrow in the left-right direction.

  FIG. 5 (iii) shows the fulcrum 117 and the fulcrum regulating part 212 that regulates it. The fulcrum 117 is regulated by the fulcrum regulating unit 212 and moves only in the front-rear direction. At this time, the movable range of the fulcrum 117 forward and backward coincides with the movable range of the locking hole 201 in the front-rear direction. Moreover, it cannot move by being regulated by the fulcrum regulating unit 212 in the left-right direction.

  FIG. 5 (ii) shows the movable range of the center point 213 of the movable member 112 when the shake correction apparatus 100 is locked. The center point 213 of the movable member 112 is regulated by the locking pin 202 in the front-rear direction and coincides with the movable range of the locking hole 201 in the front-rear direction. Moreover, it is regulated by the locking pin 202 and the fulcrum regulating part 212 in the left-right direction, and its movable range is substantially half in the front-back direction. Therefore, the movable range of the center point 213 of the movable member 112 is substantially elliptical.

The reason why the movable range in the left-right direction of the center point 213 of the movable member 112 is substantially halved is that the movement in the left-right direction is a swing motion with the fulcrum 117 as an axis. The lock mechanism 151 and the fulcrum regulating portion 212 of the fulcrum 117 are disposed at substantially opposite positions on a plane perpendicular to the optical axis with the optical axis as the center. When the fulcrum 117 is the axis, the distance to the center point 213 of the movable member 112 is approximately half of the distance to the locking hole 201. Therefore, similarly, the movable range of the central point 213 of the movable member 112 to the left and right is substantially half of the movable range of the locking hole.

  FIG. 6 is a schematic view of the movable range when the movable member is locked, as viewed from the image plane side. Each axis driving means an axis on which the movable member 112 moves when the correction driving means 161x, 161y, 161z of each axis is operated. The detection of the contact coordinates of the locking pin 202 and the locking hole 201 is performed at one point in the short side direction of the substantially ellipse, so that the distance for moving the center point 213 of the movable member 112 can be minimized. Further, the movement in the long side direction needs to drive the X-axis correction driving unit 161x and the Z-axis correction driving unit 161z, but only the Y-axis correction driving unit 161y may be driven in the short side direction.

  The detection of the contact is performed in the position adjustment process at the time of manufacture. The locking pin 202 is loosely inserted into the locking hole 201 and is moved to the short side of the substantially ellipse by the correction driving means 161. The position coordinates are detected by the Hall element, and the Hall element output corresponding to the position coordinates is stored in the memory means 312.

  Next, a method for obtaining the slow insertion coordinates from the contact coordinates will be described. FIG. 7 is a schematic diagram when obtaining the slow insertion coordinates. What is indicated by a black dot is the center point 213 of the movable member, and its movable limit is indicated as a trajectory 214 that the center point of the movable member can take. The loosely inserted coordinates are coordinates obtained by moving the movable member 112 including the locking hole 201 in the center direction along the Y axis by the maximum relative error amount from the contact coordinates. The maximum relative error amount is obtained from the driving variation of the locking pin 202 and the detection accuracy of the movable member 112.

  When the locking mechanism is driven, even if it is attempted to loosely insert the locking pin 202 at a certain position, a slight error occurs from the assumed behavior. That is, deviation occurs in a plane orthogonal to the optical axis. The maximum relative error amount is the maximum error amount that can be taken in driving the lock mechanism. If the movable member 112 is moved from the contact coordinates by the maximum relative error amount, a reliable locking operation can be performed without any contact between the locking pin 202 and the locking hole 201 no matter what error occurs during the locking operation. It can be performed.

  FIG. 8 is a schematic diagram illustrating drive variation. Drive variation is an error generated from a mechanical structure. A solid line in FIG. 8 shows a theoretical locking pin insertion state, and a broken line shows a maximum drive variation state.

  The locking pin 202 is theoretically loosely inserted parallel to the optical axis, but in reality it is loosely inserted with some variation. This is because a certain amount of gap is provided in advance between parts in consideration of frictional force, manufacturing error, and the like when designing parts. The degree of inclination can be calculated from the component design information. The distance when the maximum drive variation state is projected onto a plane perpendicular to the optical axis is the drive variation.

  The detection accuracy is an error generated from the detection structure. With respect to the position of the movable member 112, the position coordinates detected as analog data by the Hall element are converted into digital data by A / D conversion. However, in the theory of A / D conversion, it is impossible to convert analog data into digital data in a perfect form. Therefore, a constant error always occurs as long as A / D conversion is performed in the detection process. The error at this time is the detection accuracy of the movable member 112.

  In this embodiment, the drive variation of the locking pin 202 and the detection accuracy of the movable member 112 are numerical values determined at the stage of component design. The same applies to the maximum relative error amount obtained from them. That is, if one point at which the locking pin 202 and the locking hole 201 are contacted is measured, it is possible to obtain the slow insertion coordinates by moving the movable member 112 toward the center by the maximum relative error amount. . Here, in order not to generate a situation where the locking pin 202 contacts the locking hole 201, it is necessary to select an appropriate contact point. The optimum contact point is one point in the short side direction of the substantially ellipse.

  FIG. 9 is a schematic diagram showing the maximum relative error amount, and is a diagram for explaining that one point in the short side direction of a substantially ellipse is more suitable as a contact point than one point in the long side direction. The inner approximate ellipse is the center of the movable member when moved from the trajectory (hereinafter referred to as the outer trajectory) 214 that can be taken by the center point 213 of the movable member by the maximum relative error amount in the tangential vertical inner direction of the approximate ellipse. A locus 215 that the point 213 can take (hereinafter referred to as an inner locus) 215. Therefore, as long as the center point 213 of the movable member exists inside the inner locus 215, the locking operation is reliably performed.

  A hatched portion indicates a region 216 sandwiched between the outer locus 214 and the inner locus 215. The fact that the center point 213 of the movable member is present in the region 216 means that the center point 213 of the movable member can deviate from the region within the outer locus 214 due to a maximum relative error during the actual locking operation. That is. That is, there is a possibility that the locking operation cannot be performed.

  Here, when the locking pin 202 and the locking hole 201 are contacted at a single point, it is necessary to consider variations in the contact position. For example, when position detection is attempted at the contact point 217 in the short side direction of the ellipse, if the contact position varies, the center point 213 of the movable member deviates from the contact point 217 in the short side direction and Take some position. Due to such variation in the contact position, the locking operation becomes unstable. This is the same even when contact is made at one point in the long side direction. At this time, there is a difference between the position detection at the contact point 217 in the short-side direction of the substantially ellipse and the position detection at the contact point 218 in the long-side direction of the approximately ellipse in the situation when the contact position varies.

  In the variation of the contact position at the contact point 217 in the short side direction of the substantially ellipse, when the center point 213 of the movable member is moved by the maximum relative error amount, the variation is almost inward as long as no significant contact position variation occurs. Get on the track 215. However, in the variation of the contact position at the contact point 218 in the long side direction of the substantially ellipse, when the center point 213 of the movable member is moved by the maximum relative error amount, the contact point 218 moves to the region 216 with a slight variation of the contact position. End up.

  This is because the curvature of the inner locus at the contact point 217 in the short side direction of the substantially ellipse and the contact point 218 in the long side direction of the substantially ellipse are different.

  The moving direction of the center point 213 of the movable member when the contact position varies will be described. When the center point 213 of the movable member is accurately moved at the contact point 217 in the short side direction of the substantially ellipse without causing variations in the contact position, the direction is the Y-axis inner side direction. Similarly, the moving direction at the contact point 218 in the long side direction of the substantially ellipse is the Y axis orthogonal inner direction. The variation in the contact position is not intended, and the moving direction is not changed thereby. Therefore, even if the contact position varies, the center point 213 of the movable member moves in the Y-axis inner direction or the Y-axis orthogonal inner direction, which is a predetermined direction.

  When the variation of the contact position at the contact point 217 in the short side direction of the substantially ellipse occurs, the movement from the variation position to the inner side of the Y axis is performed. In this case, since the curvature at the contact point 217 in the short side direction of the substantially ellipse is small, the center point 213 of the movable member is almost on the inner locus 215.

  On the other hand, when the variation of the contact position occurs at the contact point 218 in the long side direction of the substantially ellipse, the movement from the variation position to the inner side perpendicular to the Y axis is similarly performed. As a result, since the curvature at the contact point 218 in the long side direction of the ellipse is large, the center point 213 of the movable member moves greatly to the region 216 due to variations in the contact position.

  That is, contact at one point in the short side direction of the ellipse is more resistant to variations in the contact position than that at one point in the long side direction, and stable locking can be performed.

  The slow insertion coordinates are obtained in the position adjustment process at the time of manufacture. In the position adjustment process at the time of manufacture, the contact coordinates are detected at one point in the short side direction in the substantially elliptical movable range. Then, the slow insertion coordinates are obtained from the contact coordinates and the maximum relative error amount, and recorded in the memory means 312. When actually performing the locking operation, the movable member 112 is moved to the pre-recorded loosely inserted coordinates, and the locking mechanism 151 performs the locking operation according to a command from the lock control circuit 311.

According to the above-described embodiment, the manufacturing time can be shortened by performing the detection of the contact coordinates at only one point rather than at two points.

  In addition, by making the coordinates at which the locking pin 202 and the locking hole 201 are in contact with one point on the short side of the substantially elliptical shape, the movement distance is shorter than the contact on the long side, and the variation in the contact position and driving are performed. Since it is resistant to variations, it can be moved and contacted in a short time and stably.

  Further, since the movable member can be moved only by driving the Y-axis correction driving means 161y, it is not necessary to perform complicated processing, and easy movement processing is possible.

  In addition, since the process of calculating the center of the locking hole 201 which is necessary in the method of detecting the contact coordinates at two points is unnecessary, the position adjustment process can be simplified.

  That is, the present invention reduces the number of steps for obtaining the locking pin loose insertion position and simplifies the processing, thereby enabling the manufacturing process to be speeded up and performing the reliable locking operation of the shake correction device 100. The objective of providing a lens barrel 300 that can be used is an imaging optical system, a movable member 112 that holds a correction lens 111 that constitutes a part of the imaging optical system, and a movable member 112 perpendicular to the optical axis. A base member 121 movably supported on a flat surface, a plurality of correction driving means 161 for driving the movable member 112 in different directions with respect to the base member 121, and the movable member on a plane perpendicular to the optical axis. The shake correction apparatus 100 having a position detecting means for detecting the position of 112, and the base member 121, the locking pin 202, and the locking hole 20 provided in the movable member 112. A lock mechanism 151 having a lock pin driving means for loosely inserting the lock pin, a lock control circuit 311 for controlling the lock operation by the lock pin 202, and the lock pin 202 being loosely inserted into the lock hole 201 to move the movable member 112. , The contact coordinates of the locking pin 202 on a plane perpendicular to the optical axis detected by driving the locking pin 202 in a predetermined direction and bringing the locking pin 202 into contact with the locking hole 201, and the drive variation of the locking pin 202 And a memory means 312 for recording the locking pin loosely inserted coordinates calculated from the maximum relative error amount calculated from the detection accuracy of the movable member 112.

  The lens barrel according to the present invention is appropriately deformed and enlarged / reduced according to the imaging apparatus to which the present invention is applied. In addition, various modifications and changes such as a change in appearance due to a change in the external dimensions of the apparatus and a coupling position between members are possible as necessary, but all are within the equivalent scope of the present invention.

100 Shake correction device 111 Correction lens 112 Movable member 113 Permanent magnet 114 Back yoke 115 Movable yoke 116 Protruding portion 117 Support point 121 Base member 131 Circuit board 132 Coil 141 Steel ball 151 Lock mechanism 161 Correction drive means 161x X-axis correction drive means 161y Y Axis correction driving means 161z Z-axis correction driving means 201 Locking hole 202 Locking pin 211 Restriction part 212 Supporting point restriction part 213 Center point 214 of movable member Possible locus 215 of the center point of the movable member Maximum relative to the center of the ellipse The trajectory 216 that can be taken by the center point of the movable member when moved by the amount of error 217 between the outer trajectory and the inner trajectory 217 The contact point 218 in the direction of the short side of the approximate ellipse The contact point 300 in the direction of the long side of the approximate ellipse Lens barrel 301 Lens CPU
311 Lock control circuit 312 Memory means

Claims (1)

An imaging optical system;
A movable member which holds the correcting lens constituting a part of the imaging optical system,
A base member for movably supporting the movable member on the optical axis perpendicular to the plane,
A plurality of correction drive means for driving the movable member in different direction with respect to the base member,
A position correction means for detecting the position of the movable member on a plane perpendicular to the optical axis,
Said base member is held in a lock mechanism having a locking pin, a gentle interpolated pin driving means the locking pin in the locking hole provided in the movable member,
A lock control circuit for controlling the locking operation by the locking pin,
The loosely inserted a locking pin in the locking hole, said detected by the movable member is driven in a predetermined direction contacting said locking hole and the locking pin, wherein on the optical axis perpendicular to the plane The contact coordinates of the locking pin;
Have a, memory means for recording driving variation between the maximum relative error amount calculated from the detection accuracy of the movable member, the locking pin Yuru挿coordinates obtained from the locking pin,
Three of the correction driving means are arranged on a plane perpendicular to the optical axis in the shake correction apparatus,
The blur correction device has three restricting portions that restrict the movable range of the movable member,
One of the restricting portions is a fulcrum restricting portion that restricts the movable member only in a radial direction around the optical axis on a plane perpendicular to the optical axis,
The lens barrel according to claim 1, wherein the fulcrum restricting portion is disposed at a substantially opposite position of the lock mechanism on a plane perpendicular to the optical axis with the optical axis as a center.

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