JP2010197623A - Lens barrel and image capturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel having simple structure. <P>SOLUTION: The lens barrel includes: an optical system having at least a first optical component and a second optical component; a guide axle that extends in the direction of an optical axis of the optical system; a drive part that holds the guide axle to relatively move in the direction of the optical axis; a first holding frame that holds the drive part and the first optical component; a second holding frame that holds the second optical component and is connected to the guide axle; and a switching means that is capable of switching between a state where the guide axle is moved relatively to the drive part and a state where the guide axle is held so as not to move relatively to the drive part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus.

  Japanese Patent Application Laid-Open No. 2004-151561 discloses that a lens that moves in the optical axis direction in a zooming operation among the lenses of a zoom lens is rotated in a focusing operation.

JP-A-5-142475

  In the conventional zoom lens, when the holding frame for holding the lens is engaged with the guide shaft and moved, the holding frame cannot be rotated by the focusing operation, and there is a restriction on the mechanism.

  In order to solve the above problems, as a first aspect of the present invention, an optical system having at least a first optical component and a second optical component, a guide shaft extending in the optical axis direction of the optical system, A drive unit that holds the drive unit and the first optical component so as to be relatively movable in the axial direction; a second holding frame that holds the second optical component and is coupled to the guide shaft; A lens barrel is provided that includes switching means capable of switching between a state in which the guide shaft is moved relative to the drive unit and a state in which the guide shaft is held so as not to move relative to the drive unit. .

  As a second aspect of the present invention, there is provided an imaging device (300) including the lens barrel and an imaging unit (200) that records an image formed by the lens barrel.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

1 is a cross-sectional view of a lens barrel 100. FIG. 1 is a cross-sectional view of a lens barrel 100. FIG. 1 is a cross-sectional view of a lens barrel 100. FIG. 1 is a cross-sectional view of a lens barrel 100. FIG. 2 is a schematic cross-sectional view of a camera system 300. FIG.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  1 and 2 are cross-sectional views of the lens barrel 100. FIG. FIG. 1 shows a state in which the lens barrel 100 is scaled to the wide angle side, and FIG. 2 shows a state in which the lens barrel 100 is scaled to the telephoto side. Elements common to FIGS. 1 and 2 are denoted by the same reference numerals. Note that a part of the members that appear in FIG. 1 due to the zooming operation of the lens barrel 100 does not appear in FIG.

  The lens barrel 100 includes an optical system including six groups of lenses L1, L21, L22, L3, L4, and L5 that are sequentially arranged on a common optical axis X. In the following description, unless otherwise specified, the object side of the optical system of the lens barrel 100 is referred to as the front side, and the image side is referred to as the rear side.

  The lenses L1, L21, L22, L3, L4, and L5 are held by lens frames 160, 191, 190, 70, 80, and 90, respectively. The lens frame 80 that holds the lens L4 also holds an aperture device 222 that changes the optical path diameter of the optical system.

  The lens frame 191 has a cam follower 192 and holds the linear actuator 127. The cam follower 192 protrudes from the outer peripheral surface of the lens frame 190 outward in the radial direction.

  The lens barrel 100 includes a fixed cylinder 110 that is fixed to the imaging unit 200 including an image sensor and the like. The fixed cylinder 110 is a reference for the operation of the lens barrel 100.

  On the outer peripheral front side of the fixed cylinder 110, an inner cylinder 140, an intermediate cylinder 150, an outer cylinder 161, and a zoom ring 130 that are coaxial with each other are arranged in this order from the inside. A focus ring 120 is disposed behind the zoom ring 130 on the outer peripheral surface of the lens barrel 100.

  A cam cylinder 170 is disposed inside the fixed cylinder 110. The cam cylinder 170 has cam grooves 171, 173, 175 formed to be inclined with respect to the optical axis X.

  A pair of guide bars 102 and 104 disposed in parallel with the optical axis X are disposed further inside the cam cylinder 170. The front ends of the guide bars 102 and 104 are fixed to the lens frame 190, and are joined together by the lens frame 190.

  The fixed cylinder 110 includes a rectilinear groove 111, a cam pin 112, a mount 113, and a support portion 114. The rectilinear groove 111 extends in the optical axis X direction of the lens barrel 100. The cam pin 112 protrudes radially inward from the inner peripheral surface of the fixed cylinder 110 and engages with the cam groove 173 of the cam cylinder 170.

  The mount 113 is disposed at the rear end of the fixed cylinder 110. By engaging the mount 113 with the imaging unit 200, the fixed cylinder 110 is fixed to the imaging unit 200. When the fixed cylinder 110 is fixed to the imaging unit 200, the mount surface 115 at the rear end of the fixed cylinder 110 is in close contact with the front surface of the imaging unit 200. Thereby, the entire lens barrel 100 is positioned with respect to the imaging unit 200.

  The two pairs of support portions 114 protrude from the inner peripheral surface of the fixed cylinder 110 toward the inside in the radial direction and support the guide bars 102 and 104. Each of the pair of support portions 114 that support the guide bar 102 disposed on the upper side in the drawing has a fitting hole 116 having a shape complementary to the shape of the outer periphery of the guide bar 102. The guide bar 102 is inserted into the fitting hole 116 and is slidably supported. As a result, the guide bar 102 is allowed to move in the optical axis X direction, and is restricted from displacement and inclination in other directions.

  The pair of support portions 114 that support the guide bar 104 disposed on the lower side in the drawing each have U-shaped grooves 118 including parallel surfaces having the same interval as the diameter of the guide bar 104. The guide bar 104 is inserted into the U-shaped groove 118 and is allowed to move in the direction of the optical axis X while being restricted from being displaced in a direction perpendicular to the optical axis X.

  Since the pair of guide bars 102 and 104 are connected to the lens frame 190, the lens L21 is prevented from being inclined. Further, the guide bar 104 guides the lens frame 190 so as to move in the optical axis X direction in cooperation with the guide bar 102.

  The guide bars 102 and 104 also guide the lens frame 191. That is, the lens frame 191 has a fitting hole 195 having a shape complementary to the shape of the outer periphery of the guide bar 102, and the guide bar 102 is inserted into the fitting hole 195. This prevents the lens frame 190 from being tilted with respect to the optical axis X.

  Further, the lens frame 191 has a long hole 197 including parallel surfaces with the same interval as the diameter of the guide bar 104, and the guide bar 104 is inserted through the long hole 197. The elongated hole 197 and the fitting hole 195 prevent the lens frame 190 and the lens L21 held therein from rotating about the optical axis X.

  The linear actuator 127 is inserted through the guide bar 102 and moves the guide bar 102 in the optical axis X direction when operated. Since the linear actuator 127 is held by the lens frame 191, the guide bar 102 moves relative to the lens frame 191 when the linear actuator 127 is operated. Thus, by adopting a structure in which the linear actuator 127 directly drives the guide bar 102, a drive mechanism for the guide bar 102 can be formed without increasing the number of parts.

  Further, the linear actuator 127 holds the guide bar 102 when not operating, and regulates the displacement of the guide bar 102 with respect to the linear actuator 127. Therefore, the guide bar 102 is integrated with the lens frame 191 when the linear actuator 127 is not operating.

  As described above, the linear actuator 127 that switches between the operation of driving the guide bar 102 and the operation of gripping the guide bar 102 can be formed by, for example, an ultrasonic actuator using a piezoelectric material, an electrostrictive material, or the like. Further, an equivalent linear actuator 127 can be formed by combining an actuator that drives the guide bar 102 and a mechanism that grips the guide bar 102.

  The inner cylinder 140 has a cam follower 142, a clearance hole 144, a rectilinear groove 146, and an engagement protrusion 148. The cam follower 142 protrudes inward in the radial direction of the lens barrel 100 in the vicinity of the rear end of the inner tube 140. The rectilinear groove 146 extends in the optical axis X direction. The engagement protrusion 148 protrudes outward in the radial direction of the lens barrel 100.

  The cam follower 142 passes through the rectilinear groove 111 of the fixed cylinder 110 and engages with the cam groove 171 of the cam cylinder 170. As a result, the cam follower 142 is restricted from rotating around the optical axis X. Since the cam groove 171 is formed to be inclined with respect to the optical axis X, a driving force for moving the inner cylinder 140 in the direction of the optical axis X is transmitted to the cam follower 142 when the cam cylinder 170 rotates.

  The escape hole 144 is disposed on the substantially opposite side of the rectilinear groove 146 in the circumferential direction of the lens barrel 100. A cam follower 172 of a cam cylinder 170 described later is inserted into the escape hole 144.

  The middle cylinder 150 includes a cam follower 152, a cam groove 154, a rectilinear groove 156, and an engagement circumferential groove 158. The cam follower 152 protrudes outward in the radial direction of the lens barrel 100. The cam groove 154 extends while being inclined with respect to the optical axis X.

  The rectilinear groove 156 is disposed on the substantially opposite side to the cam groove 154 in the circumferential direction of the lens barrel 100. The rectilinear groove 156 extends in the optical axis X direction and engages with the cam follower 172 of the cam barrel 170.

  The engagement circumferential groove 158 is formed on the inner circumferential surface of the middle cylinder 150 along a plane orthogonal to the optical axis X. The engagement circumferential groove 158 engages with the engagement protrusion 148 of the inner cylinder 140. Thereby, the middle cylinder 150 moves integrally with the inner cylinder 140 in the optical axis X direction, and is rotatable with respect to the inner cylinder 140 around the optical axis X.

  The outer cylinder 161 has a cam follower 162. The cam follower 162 projects inward in the radial direction of the lens barrel 100 and engages with the cam groove 154 of the middle cylinder 150 and the rectilinear groove 146 of the inner cylinder 140. Thereby, when the middle cylinder 150 rotates around the optical axis X, the cam follower 162 restricts the outer cylinder 161 from rotating around the optical axis X, while applying a driving force in the optical axis X direction to the outer cylinder 161. Tell.

  The outer cylinder 161 is coupled to a lens frame 160 that holds the lens L1. Thereby, when the outer cylinder 161 moves in the optical axis X direction, the lens L1 also moves along the optical axis X.

  The cam cylinder 170 is rotatably disposed inside the fixed cylinder 110. The cam cylinder 170 includes a plurality of cam grooves 171, 173, and 175 and a cam follower 172. The cam grooves 171, 173, and 175 are formed to be inclined with respect to the optical axis X, respectively. The cam groove 171 engages with the cam follower 142 of the inner cylinder 140. The cam groove 173 engages with the cam pin 112 of the fixed cylinder 110. The cam groove 175 engages with the cam follower 192 of the lens frame 191.

  The cam follower 192 is preferably disposed in the vicinity of the guide bar 102 in the circumferential direction of the lens frame 191. Thereby, the transmission efficiency of the driving force by the cam follower 192 is improved.

  The cam follower 172 is attached to the cam cylinder 170 via a connecting member 174. The tip of the cam follower 172 passes through the escape hole 144 of the inner cylinder 140 and engages with the rectilinear groove 156 of the middle cylinder 150. Thereby, when the middle cylinder 150 rotates around the optical axis X, a driving force for rotating the cam cylinder 170 is transmitted from the cam follower 172 to the cam cylinder 170.

  The cam cylinder 170 is used to generate a driving force for moving the lens frames 70, 80, and 90 holding the other lenses L3, L4, and L5 in the optical axis X direction. May be further provided. Further, the cam cylinder 170 may remove a region where no cam groove or the like is formed for the purpose of reducing the weight or the like. For this reason, the cam cylinder 170 does not necessarily form a complete cylinder.

  The zoom ring 130 is mounted so as to be rotatable around the optical axis X along the outer peripheral surface of the fixed cylinder 110. The zoom ring 130 has a guide groove 132 on the inner peripheral surface. The guide groove 132 extends linearly in parallel to the optical axis X direction and engages with the cam follower 152 of the middle cylinder 150. Thus, when the zoom ring 130 is rotated, the middle cylinder 150 also rotates around the optical axis X.

  The focus ring 120 is mounted so as to be rotatable around the optical axis X along the outer peripheral surface of the fixed cylinder 110. A rotation amount detection unit 121 is disposed inside the focus ring 120. Further, a lens barrel control unit 123 connected to the rotation amount detection unit 121 is provided. The lens barrel control unit 123 is also connected to a movement amount detection unit 125 disposed near the rear end of the fixed tube 110.

  The rotation amount detection unit 121 detects the rotation amount of the focus ring 120 rotated by a rotation operation from the outside. The movement amount detection unit 125 detects the movement amount of the guide bar 102 in the optical axis X direction with respect to the fixed cylinder 110. The operation of the lens barrel control unit 123 will be described later.

  The rotation amount detection unit 121 can be formed using, for example, a rotary scale that rotates together with the focus ring 120 and an optical sensor that counts the scale of the rotary scale. It can also be formed using a magnetic body that rotates together with the focus ring 120 and a magnetic sensor that measures changes in the magnetic field caused by the movement of the magnetic body.

  The movement amount detection unit 125 can be formed by, for example, a linear scale that moves integrally with the guide bar 102 and an optical sensor that counts the scale. It can also be formed by a magnetic body that moves with the guide bar 102 and a magnetic sensor that measures changes in the magnetic field caused by the movement of the magnetic body.

  Next, the zooming operation of the lens barrel 100 having the above structure will be described. In the zooming operation of the lens barrel 100, all the lenses L1, L21, L22, L3, L4, and L5 are moved in the optical axis X direction by rotating the zoom ring 130. However, the lenses L21 and L22 move integrally as will be described later.

  When the zoom ring 130 is operated from the outside and rotates around the optical axis X, the cam follower 152 of the middle cylinder 150 is engaged with the guide groove 132 of the zoom ring 130, so that the rotational driving force is transmitted to the middle cylinder 150. Is done. In FIG. 2, the cam follower 152 that has been moved by the rotation becomes invisible.

  When the middle cylinder 150 rotates, driving force is transmitted from the cam groove 154 to the cam follower 162 of the outer cylinder 161. The cam follower 162 that has received the driving force is guided by the rectilinear groove 146 of the inner cylinder 140 and moves in the optical axis X direction. As a result, the lens frame 160 coupled to the tip of the outer cylinder 161 and the lens L1 held by the lens frame 160 move integrally in the optical axis X direction.

  Further, when the middle cylinder 150 rotates, the rotational driving force is also transmitted to the cam follower 172 engaged with the rectilinear groove 156. As a result, the cam cylinder 170 rotates around the optical axis X along the inner peripheral surface of the fixed cylinder 110. In FIG. 2, the rectilinear groove 156 and the cam follower 172 that have been moved by the rotation are not visible.

  When the cam cylinder 170 rotates, a driving force is transmitted to the cam follower 142 that engages with the cam groove 171. The cam follower 142 is guided by the rectilinear groove 111 of the fixed cylinder 110 and moves in the optical axis X direction. Thereby, the inner cylinder 140 and the middle cylinder 150 engaged with the inner cylinder 140 by the engagement circumferential groove 158 move in the optical axis X direction.

  Further, when the cam cylinder 170 rotates, the cam cylinder 170 is driven in the X direction by being driven by the cam pin 112 of the fixed cylinder 110 engaged with the cam groove 173. Further, when the cam cylinder 170 rotates, a driving force is transmitted from the cam groove 175 to the cam follower 192, and the lens L21 also moves in the optical axis X direction together with the lens frame 191.

  Further, the non-operating linear actuator 127 holds the guide bar 102. As a result, the guide bars 102 and 104 move together with the lens frame 191. Accordingly, the lens frame 190 coupled to the guide bars 102 and 104 also moves with the lens L22.

  Thus, when the zoom ring 130 is rotated, the lenses L21 and L22 move integrally. Further, the lens L1 is moved by the movement of the outer cylinder 161. Since the other lenses L3, L4, and L5 also move and the mutual distance changes, the focal length of the lens barrel 100 can be changed.

  Since the other lenses L3, L4, and L5 need only be moved only when the lens barrel 100 is scaled, an existing drive mechanism can be arbitrarily selected and used. That is, the lens frames 70, 80, 90 may be guided and moved by cam grooves and straight grooves provided in the cam cylinder 170 and the fixed cylinder. Alternatively, the guide frames 102 and 104 may be used to guide the lens frames 70, 80, and 90.

  A cover cylinder 165 mounted coaxially with respect to the fixed cylinder 110 is disposed between the outer cylinder 161 and the zoom ring 130. The cover cylinder 165 advances and retreats along with the outer cylinder 161 and seals between the outer cylinder 161 and the zoom ring 130. This prevents dust from entering the lens barrel 100.

  Furthermore, in the above example, the cam cylinder 170 and the lens frame 191 are engaged by the cam groove 175 on the cam cylinder 170 side and the cam follower 192 on the lens frame 190 side. However, the same function can be obtained by providing a cam follower on the cam cylinder 170 side and a cam groove on the lens frame 191 side.

  FIG. 3 is a cross-sectional view for explaining the focusing operation of the lens barrel 100. Elements common to those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted. In the focusing operation, the lens 22 moves and the lens L21 does not move. Further, the other lenses L1, L3, L4, and L5 do not move.

  When the focus ring 120 is rotated in the lens barrel 100, the rotation amount detection unit 121 transmits a rotation amount signal corresponding to the rotation amount to the lens barrel control unit 123. The lens barrel control unit 123 generates a drive signal that is increased or decreased according to the rotation amount signal received from the rotation amount detection unit 121 and supplies the drive signal to the linear actuator 127.

  The linear actuator 127 operates with a drive amount corresponding to the received drive signal, and moves the guide bar 102 in the optical axis X direction. Accordingly, the lens frame 190 moves together with the guide bar 102, and the focal position of the lens barrel 100 changes. At this time, as the lens frame 190 moves, the guide bar 104 also moves in the optical axis X direction.

  The movement amount detection unit 125 transmits a movement amount signal corresponding to the movement amount of the guide bar 102 to the lens barrel control unit 123. The lens barrel control unit 123 refers to the movement amount signal received from the movement amount detection unit 125 and corrects the generated drive signal. Thereby, the movement amount error of the guide bar 102 due to disturbance can be corrected to move the lens L22 accurately, and the lens barrel 100 can be focused quickly and with high accuracy.

  FIG. 4 is a cross-sectional view showing the structure of a lens barrel 100 having another structure. The lens barrel 100 has the same structure as the lens barrel 100 shown in FIGS. 1 to 3 except for the parts described below. Therefore, common elements are denoted by the same reference numerals, and redundant description is omitted.

  The lens barrel 100 has a unique structure in that it further includes a linear actuator 128 inserted through the guide bar 104 and a movement amount detection unit 126 in addition to the linear actuator 127 inserted through the guide bar 102. The added linear actuator 128 operates in parallel with the existing linear actuator 127. That is, the linear actuator 128 is controlled by the lens barrel control unit 123 simultaneously with the linear actuator 127, and operates or stops simultaneously when the linear actuator 127 is operated or stopped.

  When the linear actuators 127 and 128 are not in operation, the linear actuators 127 and 128 hold the guide bars 102 and 104 to restrict the displacement of the guide bars 102 and 104 with respect to the linear actuators 127 and 128. As a result, when the lens frame 191 moves in the zooming operation, the lens frame 190 also moves integrally. At this time, since the guide bars 102 and 104 are simultaneously driven on the upper end side and the lower end side of the lens frame 190, the lens L2 moves smoothly.

  The linear actuators 127 and 128 operate simultaneously to drive the guide bars 102 and 104, respectively. As a result, the lens frame 190 holding the lens L2 is driven simultaneously at the upper and lower ends in the drawing and moves smoothly.

  In the above example, the case where the pair of linear actuators 127 and 128 are simultaneously operated or stopped has been described. However, the tilt of the lens frame 190 and the lens L22 with respect to the optical axis X can be changed by individually operating the pair of linear actuators 127 and 128. Thereby, the characteristics of the optical system due to the inclination of the lens L22 can be compensated by using the linear actuators 127 and 128.

  FIG. 5 is a diagram schematically illustrating the structure of the camera system 300 including the lens barrel 100. For the purpose of avoiding complicated description of the drawings, the lens barrel 100 is simply illustrated in FIG. However, the lens barrel 100 in FIG. 5 has the same structure as the lens barrel 100 shown in FIGS. 1 to 3, for example. Therefore, common constituent elements are denoted by the same reference numerals and description thereof is omitted.

  The camera system 300 includes a lens barrel 100 and an imaging unit 200. The lens barrel 100 is detachably attached to the mount unit 260 of the imaging unit 200.

  The lens barrel 100 attached to the camera system 300 is also electrically coupled to the imaging unit 200 via a connection terminal (not shown). Thereby, the lens barrel 100 is supplied with power from the imaging unit 200. A signal is also transmitted from the lens barrel 100 side to the imaging unit 200 side.

  The imaging unit 200 houses an optical system including a main mirror 240, a pentaprism 270, and an eyepiece optical system 290, and a main control unit 250. The primary mirror 240 has a standby position that is inclined on the optical path of incident light incident through the optical system of the lens barrel 100, and an imaging position that rises while avoiding the incident light (indicated by a dotted line in the figure). Move between.

  The primary mirror 240 in the standby position guides most of the incident light to the focusing screen 272 disposed above. The focusing screen 272 is disposed at a position where an image is formed when the optical system of the lens barrel 100 is focused, and visualizes the image.

  The image formed on the focusing screen 272 is observed from the eyepiece optical system 290 via the pentaprism 270. As a result, the image on the focusing screen 272 can be viewed as a normal image from the eyepiece optical system 290.

  A half mirror 292 is disposed between the pentaprism 270 and the eyepiece optical system 290. The half mirror 292 superimposes the display image formed on the finder LCD 294 on the image on the focusing screen 272. Thereby, the image of the focusing screen 272 and the image of the finder LCD 294 can be seen together at the exit end of the eyepiece optical system 290. The viewfinder LCD 294 displays information such as shooting conditions and setting conditions of the camera system 300.

  A part of the light emitted from the pentaprism 270 is guided to the photometry unit 280. The photometry unit 280 measures the intensity of incident light, its distribution, and the like, and refers to the measurement result when determining imaging conditions.

  On the other hand, a secondary mirror 242 is disposed on the back surface of the primary mirror 240 with respect to the incident light incident surface. The secondary mirror 242 guides part of the incident light transmitted through the primary mirror 240 to the focus detection device 230 disposed below. Thereby, when the primary mirror 240 is in the standby position, the focus detection device 230 detects the focus adjustment state of the optical system. When the primary mirror 240 is moved to the photographing position, the secondary mirror 242 is also retracted from the optical path of the incident light.

  A shutter 220, an optical filter 212, and an image sensor 210 are arranged along the optical axis behind the main mirror 240 with respect to the incident light from the lens barrel 100. When the shutter 220 is opened, the primary mirror 240 moves to the photographing position immediately before that, so that the incident light travels straight and enters the image sensor 210. As a result, the image formed by the incident light is converted into an electrical signal in the image sensor 210.

  In addition, the imaging unit 200 includes a main LCD 296 facing the outside on the rear surface with respect to the lens barrel 100. The main LCD 296 can display various setting information for the image capturing unit 200 and can display an image formed on the image sensor 210 when the primary mirror 240 is moved to the photographing position.

  The main control unit 250 comprehensively controls the various operations as described above. In addition, an autofocus mechanism that drives the lens barrel 100 can be formed by referring to information on the distance to the subject detected by the focus detection device 230 on the imaging unit 200 side. Furthermore, the focus detection device 230 can form a focus aid mechanism by referring to the operation amount of the lens barrel 100.

  Further, the main controller 250 exchanges information with the microprocessor of the lens barrel 100 to control the opening / closing of the aperture device 222 and the like. Further, the main control unit 250 contributes to automating exposure, execution of a scene mode, execution of bracket photography, and the like.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

70, 80, 90, 160, 190, 191 Lens frame, 100 Lens barrel, 102, 104 Guide bar, 110 Fixed barrel, 111, 146, 156 Straight groove, 112 Cam pin, 113 Mount, 114 Support, 115 Mount surface 116, 195 Fitting hole, 118 U-shaped groove, 120 Focus ring, 121 Rotation amount detection unit, 123 Lens barrel control unit, 125, 126 Movement amount detection unit, 127, 128 Linear actuator, 130 Zoom ring, 132 Guide groove , 140 Inner cylinder, 142, 152, 162, 172, 192 Cam follower, 144 Escape hole, 148 Engagement projection, 150 Middle cylinder, 154, 171, 173, 175 Cam groove, 158 Engagement circumferential groove, 161 Outer cylinder, 165 Cover cylinder, 170 cam cylinder, 174 connecting member, 197 slot, 2 DESCRIPTION OF SYMBOLS 0 Image pick-up part, 210 Image pick-up element, 212 Optical filter, 220 Shutter, 222 Aperture device, 230 Focus detection apparatus, 240 Primary mirror, 242 Secondary mirror, 250 Main control part, 260 Mount part, 270 Penta prism, 272 Focusing screen, 280 Metering unit, 290 eyepiece optical system, 292 half mirror, 294 finder LCD, 296 main LCD, 300 camera system

Claims (8)

An optical system having at least a first optical component and a second optical component;
A guide shaft extending in the optical axis direction of the optical system;
A drive unit that holds the guide shaft so as to be relatively movable in the optical axis direction;
A first holding frame for holding the drive unit and the first optical component;
A second holding frame that holds the second optical component and is coupled to the guide shaft;
A lens barrel comprising: switching means capable of switching between a state in which the guide shaft is moved relative to the drive unit and a state in which the guide shaft is held so as not to move relative to the drive unit.   The lens barrel according to claim 1, wherein at least a part of the drive unit is provided to face at least a part of the guide shaft.   3. The lens barrel according to claim 1, further comprising a driving ring that rotates around the optical axis when the first holding frame is engaged through a cam groove and the optical system is zoomed. .   4. The lens barrel according to claim 3, wherein at least one of a portion where the first holding frame is engaged with the drive ring and the drive unit is located in the vicinity of the guide shaft. 5.   5. The guide shaft according to claim 1, wherein the guide shaft is inserted into an insertion hole having a shape complementary to a peripheral surface of the guide shaft, and is relatively movable in the optical axis direction with respect to the insertion hole. The lens barrel described in 1. The holding frame has a pair of insertion portions arranged with the drive unit sandwiched in the optical axis direction,
The lens barrel according to any one of claims 1 to 5, wherein each of the pair of insertion portions has an insertion hole having a shape complementary to a peripheral surface of the guide shaft. An operation ring that is operated from the outside of the lens barrel and rotates around the optical axis direction;
A detection unit that detects the amount of rotation of the operation ring,
The lens barrel according to any one of claims 1 to 6, wherein the driving unit moves the guide shaft in the optical axis direction according to the rotation amount detected by the detection unit. The lens barrel according to any one of claims 1 to 7,
An imaging device comprising: an imaging unit that records an image formed by the lens barrel.

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