JP5834582B2 - Lens barrel and imaging device - Google Patents

Description

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

Patent Document 1 below describes a lens barrel structure in which a holding frame that holds a part of an optical system is moved in the optical axis direction in both magnification and focusing operations.
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP-A-5-142475

  In the structure in which the holding frame is translated along the guide shaft, the holding frame cannot be rotated. For this reason, the zoom lens using the guide shaft has a restriction on the mechanism design.

In order to solve the above-mentioned problem, as a first aspect of the present invention, a first guide portion that extends in the optical axis direction of the optical system and is fixed to a reference member, and a first lens guided by the first guide portion. A first holding member that moves in the optical axis direction while holding the lens, a second guide portion that is guided by the first guide portion and moves in the optical axis direction, and is fixed to the second guide portion and is different from the first lens A second holding member that moves in the optical axis direction together with the second guide portion while holding the second lens, and a reference member at a position between the end portion on the second holding member side of the first guide portion and the second holding member There is provided a lens barrel that includes a first drive unit that is fixed to the first guide unit and that moves the second guide unit in the optical axis direction by applying a driving force to the second guide unit.

  Further, as a second aspect of the present invention, there is provided an imaging device (200) having the lens barrel (100) and an imaging unit (300) that captures an image formed using the lens barrel. Is done.

  The above summary of the present invention does not enumerate all necessary features of the present invention. A sub-combination of these feature groups can also be an invention.

1 is a diagram schematically showing the structure of a single-lens reflex camera 200. FIG. 2 is a cross-sectional view of the lens unit 100. FIG. 2 is a cross-sectional view of the lens unit 100. FIG. 2 is a cross-sectional view of the lens unit 100. FIG. 3 is a schematic diagram showing a structure of a linear actuator 180. FIG.

  Hereinafter, the present invention will be described through embodiments of the invention. However, 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.

  FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera 200. The single-lens reflex camera 200 includes a lens unit 100 and a camera body 300. The lens unit 100 includes a fixed cylinder 110, a focus ring 120 and a zoom ring 130 arranged on the peripheral surface of the fixed cylinder 110, and lens groups L1, L2, L3, L4, and L5 arranged inside the fixed cylinder 110. Have

  A lens mount 113 is disposed at one end of the fixed cylinder 110. The lens mount 113 is fitted to a body mount 320 of the camera body 300 described later. Thereby, the lens unit 100 is detachably attached to the camera body 300.

  Each of the lens groups L1, L2, L3, L4, and L5 is held by the lens frames 60, 190, 70, 80, and 90 and arranged along a common optical axis X. Accordingly, the lens groups L1, L2, L3, L4, and L5 form an optical system of the lens unit 100. The optical system also includes a diaphragm device 222 held in the lens frame 80 together with the lens group L4.

  Each of the lens groups L1, L2, L3, L4, and L5 individually moves along the optical axis X when the optical system is zoomed. The lens unit L2 moves along the optical axis X also when the optical system is focused. In other words, the lens unit L2 and the lens frame 190 that holds the lens unit L2 move in both cases, whether the lens unit 100 is zoomed or focused.

  The lens frame 190 is connected to the pair of guide bars 102. Each of the guide bars 102 is supported and guided by a guide pipe 104 fixed to the inner surface of the fixed cylinder 110. As a result, the guide bar 102 moves in a direction parallel to the optical axis X along the inner surface of the guide pipe 104.

  The lens unit 100 further includes a lens barrel side control unit 123 fixed to the fixed cylinder 110. The lens barrel side control unit 123 communicates with the system control unit 372 of the camera body 300 to transmit shooting information on the lens unit 100 side. Further, the operation of the lens unit 100 is controlled in accordance with a command from the system control unit 372.

  The camera body 300 includes a mirror box 330 containing a main mirror 332 and a sub-mirror 336 in the housing 310 adjacent to the body mount 320 coupled to the lens mount 113. Further, a focusing optical system 340 disposed below the mirror box 330, a focus plate 352, a pentaprism 350, and a finder optical system 360 disposed above the mirror box 330 are provided.

  Furthermore, the camera body 300 includes a focal plane shutter 390, a low-pass filter 384, and an image sensor 382, which are sequentially arranged behind the mirror box 330 on the side opposite to the lens unit 100. Furthermore, behind the image sensor 382, a main board 370 on which a system control unit 372, an image processing unit 374, and the like are mounted is disposed.

  In the mirror box 330, one end of the main mirror 332 is pivotally supported by the swing shaft 334 and swings with respect to the camera body 300. The sub mirror 336 arranged on the back surface of the main mirror 332 moves up and down as the main mirror 332 swings, and is pivotally supported by the swing shaft 338 and swings relative to the main mirror 332.

  The main mirror 332 oscillates between an obliquely arranged state inclined on the optical path of the subject luminous flux incident from the lens unit 100 and a retracted position that is lifted away from the subject luminous flux. The main mirror 332 in an oblique state reflects most of the incident light toward the focus plate 352. The focus plate 352 is arranged at a position where an image is formed when the optical system of the lens unit 100 is focused, and visualizes the image.

  The image connected to the focus plate 352 is observed by the user of the single-lens reflex camera 200 through the pentaprism 350 and the finder optical system 360. By passing the pentaprism 350, the image on the focusing screen 352 is observed by the user as an erect image.

  Moreover, the main mirror 332 has a half mirror region that transmits a part of the incident subject light flux in a part of the reflection surface. Part of the subject light flux that has passed through the half mirror region is reflected by the sub mirror 336 and enters the focusing optical system 340. The focusing optical system 340 guides part of the incident subject light flux to the focusing sensor 342, so that the camera body 300 can focus the lens unit 100.

  When the main mirror 332 is in the retracted state, the sub mirror 336 is also retracted from the optical path of the subject light beam. Therefore, the incident subject luminous flux enters the focal plane shutter 390. When the focal plane shutter 390 is open, the subject light flux passes through the low-pass filter 384 and enters the image sensor 382.

  The imaging element 382 is formed by a photoelectric conversion element such as a CCD sensor or a CMOS sensor. The image sensor 382 converts the received subject image into an electrical signal and outputs it. The electric signal output from the image sensor 382 is converted into image data in the image processing unit 374. Thus, image data corresponding to the subject luminous flux is obtained.

  The system control unit 372 controls the operation sequence of the main mirror 332, the sub mirror 336, the focal plane shutter 390, and the like. Further, the system control unit 372 calculates the focus position of the lens unit 100 from the phase difference signal output from the focus sensor 342, and focuses the lens unit 100 in cooperation with the lens barrel side control unit 123. .

  FIG. 2 is a sectional view of the lens unit 100 alone. The figure shows a state in which the lens unit 100 is zoomed to the wide-angle end side. In addition, the same reference numerals are assigned to elements common to those in FIG. 1 and redundant description is omitted.

  The lens mount 113 is coupled to the body mount 320. In a state where the lens mount 113 is coupled to the body mount 320, the rear end surface 115 of the fixed cylinder 110 is in close contact with the camera body 300. Thereby, the fixed cylinder 110 is accurately and firmly positioned with respect to the camera body 300.

  On the outer periphery of the rear part (right side in the figure) of the fixed cylinder 110, a cavity for accommodating the lens barrel side control part 123 is arranged. Further, a focus ring 120 is rotatably mounted on the outside thereof. An encoder 121 that detects the amount of rotation of the focus ring 120 is disposed inside the focus ring 120.

  On the outer side of the fixed cylinder 110, on the front end side of the lens unit 100, a coaxial inner cylinder 140, middle cylinder 150, and outer cylinder 160 are arranged in this order from the inner side. A zoom ring 130 is rotatably disposed further outside the outer cylinder 160. The zoom ring 130 has a guide groove 132 extending linearly in the optical axis X direction on the inner surface.

  The front end of the outer cylinder 160 is coupled to the lens frame 60 that holds the lens L1. Further, a cam follower 162 that protrudes inward in the radial direction of the lens unit 100 is disposed in the vicinity of the rear end of the outer cylinder 160.

  The middle cylinder 150 has a cam follower 152 that protrudes outward in the radial direction of the lens unit 100 in the vicinity of the rear end. The cam follower 152 engages with the guide groove 132 of the zoom ring 130 and rotates around the optical axis X together with the zoom ring 130 when the zoom ring 130 rotates.

  The middle cylinder 150 has a cam groove 154 that engages with the cam follower 162 in the middle of the optical axis X direction. Further, the middle cylinder 150 has an engagement groove 158 that is continuous in the circumferential direction on the inner side near the front end. Furthermore, the middle cylinder 150 has a guide groove 156 in the middle in the optical axis X direction on the lower side in the drawing. The guide groove 156 extends linearly in the optical axis X direction.

  The inner cylinder 140 engages with a guide part 111 formed directly on the fixed cylinder 110 at the rear end. As a result, the inner cylinder 140 moves only in the direction of the optical axis X, but does not rotate around the optical axis X.

  The inner cylinder 140 has an engagement protrusion 148 that engages with the engagement groove 158 of the middle cylinder 150 in the vicinity of the tip. Thereby, the inner cylinder 140 and the middle cylinder 150 are both translated in the optical axis X direction.

  Further, the inner cylinder 140 has a guide groove 144 that engages with the cam follower 162. The guide groove 144 extends linearly in the direction of the optical axis X. Thereby, the movement of the cam follower 162 in the circumferential direction is restricted, and the outer cylinder 160 moves exclusively in the direction of the optical axis X.

  Furthermore, the inner cylinder 140 has a relief hole 146 formed for the purpose of avoiding interference with a cam follower 173, which will be described later, in the middle of the lower side in the drawing. Furthermore, the inner cylinder 140 has a cam follower 142 that protrudes inward in the radial direction of the lens unit 100 in the vicinity of the lower rear end in the drawing.

  Inside the fixed cylinder 110, a cam cylinder 170 coaxial with the fixed cylinder 110 is arranged along the inner surface of the fixed cylinder 110. The cam cylinder 170 rotates around the optical axis X along the inner surface of the fixed cylinder 110.

  The cam cylinder 170 has a plurality of cam grooves 172 and 176 and a straight groove 174. A cam groove 172 disposed in the middle of the cam cylinder 170 in the optical axis X direction engages with a cam follower 112 fixed inside the fixed cylinder 110. A straight groove 174 disposed on the distal end side of the cam cylinder 170 in the optical axis X direction engages with the cam follower 191 of the transmission ring 192. A cam groove 176 disposed near the rear end of the cam cylinder 170 in the optical axis X direction engages with the cam follower 142 of the inner cylinder 140.

  Further, on the lower side in the figure, the cam cylinder 170 has a cam follower 173 coupled via a connecting member 171 in the vicinity of the front end in the optical axis X direction. The cam follower 173 projects outward in the radial direction of the lens unit 100, passes through the escape hole 146 of the inner cylinder 140, and engages with the guide groove 156 of the middle cylinder 150.

  The transmission ring 192 is disposed inside the vicinity of the tip of the cam cylinder 170. The transmission ring 192 has a cam follower 191 and a cam groove 193. The cam follower 191 is disposed on the outer peripheral surface side of the transmission ring 192, protrudes radially outward, and engages with the straight groove 174 of the cam cylinder 170. Thereby, when the cam barrel 170 rotates around the optical axis X, the transmission ring 192 also rotates around the optical axis X. The cam groove 193 is disposed on the inner peripheral surface of the transmission ring 192 and has an inclination that is neither perpendicular nor parallel to the optical axis X.

  The connecting portion 194 connects the lens frame 190 and the guide bar 102. Further, the connecting portion 194 has a cam follower 195 on the outer peripheral surface. The cam follower 195 engages with the cam groove 193 of the transmission ring 192. The connecting portion 194 is coupled to the tip of the guide bar 102 and is restricted from rotating around the optical axis X.

  Thereby, when the transmission ring 192 rotates around the optical axis X, the coupling portion 194 moves in the optical axis X direction due to the interaction between the cam groove 193 and the cam follower 195. Since the connecting portion 194 is integrally coupled to the lens frame 190 that holds the lens L2, when the connecting portion 194 moves, the lens L2 also moves.

  Each of the cam followers 191 and 195 is disposed in the vicinity of the guide bar 102 in the circumferential direction of the transmission ring 192 or the connecting portion 194. Thereby, the driving force received by the cam followers 191 and 195 is efficiently transmitted to the movement of the lens frame 190 and the lens L2.

  A pair of guide pipes 104 are fixed in the optical axis X direction further inside the cam cylinder 170. That is, both ends of each of the guide pipes 104 are supported by a pair of support portions 114 that protrude radially inward from the inner surface of the fixed cylinder 110. In addition, the support part 114 on the front side in the optical axis X direction passes through the cam cylinder 170. For this reason, the cam cylinder 170 is provided with a relief hole 178 that avoids interference with the support portion 114 when the cam cylinder 170 rotates.

  The guide bars 102 are longer than the guide pipes 104 and are slidably inserted into the guide pipes 104, respectively. The front end of the guide bar 102 is coupled to the lens frame 190 via the connecting portion 194. Accordingly, the lens frame 190 is supported so as to be movable in the direction of the optical axis X together with the guide bar 102.

  The inner diameter of the upper guide pipe 104 in the drawing is substantially equal to the outer diameter of the upper guide bar 102 in the drawing. Therefore, the guide bar 102 is accurately positioned by the guide pipe 104 on the upper side in the drawing. On the other hand, the inner diameter of the lower guide pipe 104 in the figure is larger than the outer diameter of the lower guide bar 102 in the figure, and a gap is secured between the guide pipe 104 and the guide bar 102. Accordingly, an increase in sliding resistance of the guide bar 102 with respect to the guide pipe 104 due to excessive restraint of the guide bar 102 due to manufacturing errors, assembly errors, and the like of the guide pipe 104 and the guide bar 102 is suppressed.

  Of the pair of guide pipes 104, the guide pipe 104 fixed to the upper support portion 114 is a fitting hole 74 formed in the upper support limbs of the lens frames 70, 80, 90 that hold the lenses L3, L4, L5. , 84, 94. Each of the fitting holes 74, 84, 94 has a shape complementary to the outer shape of the guide pipe 104. Accordingly, the lens frames 70, 80, and 90 are supported along the guide pipe 104 so as to be movable in the optical axis X direction.

  U-grooves 76, 86, and 96 having substantially the same width as the outer diameter of the lower guide pipe 104 are formed in the lower support limbs of the lens frames 70, 80, and 90, respectively. The U grooves 76, 86, and 96 each sandwich the guide pipe 104. Thereby, the displacement of the lower support limb in the direction orthogonal to the optical axis X is restricted. Therefore, the lens frames 70, 80, and 90 move along the outer surface of the guide pipe 104 only in a direction parallel to the optical axis X without rotating around the upper guide pipe 104.

  Further, on the inner surface of the fixed cylinder 110, the linear actuator 180, the encoder 186, and the brake 184 are fixed to the fixed cylinder 110 on the further front surface of the front support portion 114. The linear actuator 180 is inserted through the guide bar 102 and moves the guide bar 102 in the longitudinal direction. Since the tip of the guide bar 102 is connected to the lens frame 190, the lens L2 can be moved by operating the linear actuator 180.

  The encoder 186 detects the amount of movement of the guide bar 102 that is driven and moved by the linear actuator 180. Accordingly, the lens barrel side control unit 123 can perform feedback control of the movement of the guide bar 102 while monitoring the movement amount of the guide bar 102.

  The brake 184 grips the guide bar 102 and restricts the guide bar 102 from moving when the linear actuator 180 is not operating. Thereby, the position of the lens L2 is maintained. Note that the brake 184 may be omitted when an ultrasonic motor having a self-holding ability or the like is used as the linear actuator 180.

  The linear actuator 180, the encoder 186, and the brake 184 work together under the control of the lens barrel side control unit 123 to move the lens frame 190 and the lens L2, as will be described later. Further, the moved lens frame 190 and the lens L2 are held at the positions.

  FIG. 3 is a longitudinal sectional view of the lens unit 100. This figure shows a state in which the lens unit 100 is zoomed to the telephoto end. Elements common to those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.

  When the zoom ring 130 rotates to zoom the lens unit 100 to the telephoto side, the middle cylinder 150 with which the cam follower 152 is engaged also rotates around the optical axis X. However, even if the middle cylinder 150 rotates, the inner cylinder 140 does not rotate.

  Therefore, the cam follower 162 is driven in the direction of the optical axis X by the interaction between the cam groove 154 and the guide groove 144. As a result, the outer cylinder 160 is drawn forward, so that the lens frame 60 coupled to the tip of the outer cylinder 160 also moves forward. Therefore, the lens L1 held by the lens frame 60 moves forward.

  When the middle cylinder 150 rotates, a driving force that rotates around the optical axis X acts on the cam follower 173 by the guide groove 156. As a result, the cam cylinder 170 rotates around the optical axis X inside the fixed cylinder 110.

  When the cam cylinder 170 rotates, the cam cylinder 170 itself is drawn forward by the interaction between the cam groove 172 and the cam follower 112. Further, the inner cylinder 140 is also pushed forward by the interaction between the cam follower 142 coupled to the non-rotating inner cylinder 140 and the cam groove 176 of the cam cylinder 170.

  Further, when the cam cylinder 170 rotates, the rotational driving force is also transmitted to the cam follower 191 engaged with the straight groove 174. As a result, the transmission ring 192 rotates around the optical axis X, and the driving force is transmitted to the cam follower 195 of the connecting portion 194 fitted in the cam groove 193 of the transmission ring 192.

  Since the connection portion 194 is restricted from rotating around the optical axis X by the pair of guide bars 102, the connection portion 194 and the lens frame 190 translate in the optical axis X direction by the driving force transmitted to the cam follower 195. . As a result, the lens L2 held by the lens frame 190 also translates in the optical axis X direction. Thus, when the zoom ring 130 rotates, the inner cylinder 140, the middle cylinder 150, the outer cylinder 160, the cam cylinder 170, and the guide bar 102 are all extended, and the lens groups L1 and L2 move forward accordingly.

  During the zooming operation as described above, the lens barrel side control unit 123 releases the brake 184 to release the restraint of the guide bar 102. As a result, the guide bar 102 becomes movable along with the transmission ring 192 in the optical axis X direction.

  Further, after the zooming operation is completed, the lens barrel side control unit 123 operates the brake 184 and grips the guide bar 102, thereby holding the positions of the lens frame 190 and the lens L2. Such an operation of the brake 184 can be realized, for example, when the lens barrel side control unit 123 detects the operation of the zoom ring 130 and controls the brake 184.

  A cover cylinder 165 is arranged between the outer cylinder 160 and the zoom ring 130 coaxially with the fixed cylinder 110. The cover cylinder 165 advances and retreats along with the outer cylinder 160 to seal the gap between the outer cylinder 160 and the zoom ring 130. This prevents dust from entering the lens unit 100.

  Although not shown in the above example, for the purpose of changing the magnification of the lens unit 100, a lens frame 70 that holds other lenses L3, L4, and L5 by other cam grooves provided in the cam barrel 170 or the like. , 80, 90 may be moved. As a result, all of the lenses L1, L2, L3, L4, and L5 move, and the focal length of the optical system of the lens unit 100 changes.

  FIG. 4 is a cross-sectional view of the lens unit 100. Here, the focusing operation in the lens unit 100 that has been zoomed to the telephoto end will be described. Elements common to FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.

  When focusing the lens unit 100, the lens L2 held by the lens frame 190 is moved in the optical axis X direction. Therefore, the lens barrel side control unit 123 first releases the brake 184 so that the guide bar 102 is slidable with respect to the guide pipe 104. Next, the linear actuator 180 is operated to move the guide bar 102 in the optical axis X direction.

  Thereby, since the focal position of the optical system of the lens unit 100 moves, the lens unit 100 can be focused. When the single-lens reflex camera 200 is operating in the autofocus mode, the system control unit 372 referring to the detection result of the focus sensor 342 notifies the lens barrel side control unit 123 of the focus position of the lens L2. The lens barrel side control unit 123 operates the linear actuator 180 to move the lens L2 to the in-focus position.

  Thus, the linear actuator 180 applies a driving force to the guide bar 102 at a position closer to the lens frame 190 than the position where the guide pipe 104 guides the guide bar 102 in the optical axis X direction. Thereby, the driving force of the linear actuator 180 is efficiently transmitted to the guide bar 102, and the guide bar 102 moves smoothly. When the lens L2 moves to a position where the optical system is focused, the lens barrel side control unit 123 brakes the guide bar 102 with the brake 184 and maintains the focus position of the lens L2.

  In the above series of operations, the outer cylinder 160 integral with the lens frame 60 holding the lens L1 does not move. In addition, the other lens frames 70, 80, and 90 that are not shown in the drive mechanism also depend on the driving force for the rotation of the cam barrel 170, and therefore do not move by the above-described operation.

  Note that when the lens unit 100 is manually focused by rotating the focus ring 120, the rotation amount of the focus ring 120 is detected by the encoder 121, and the lens-barrel-side control unit 123 linearly operates according to the detected rotation amount. Actuator 180 is operated. Thereby, the lens L2 can be moved by reflecting the amount of rotation of the focus ring 120 by the user in the amount of movement of the lens frame 190.

  FIG. 5 is a schematic perspective view showing the structure around the linear actuator 180. Of the pair of guide bars 102 extending rearward from the connecting portion 194, the upper guide bar 102 forms part of the linear actuator 180. That is, the upper guide bar 102 has a plurality of magnetic domains magnetized in the same direction. The upper guide bar 102 has linear scales 103 that are engraved at equal intervals in the longitudinal direction.

  The upper guide bar 102 is inserted through a coil 182 and a brake 184 that are fixed to a fixed cylinder 110 (not shown). The coil 182 is supplied with current according to an instruction from the lens barrel side control unit 123 to generate a magnetic field. The direction of the strength and polarity of the generated magnetic field changes according to an instruction from the lens barrel side control unit 123.

  The lens barrel-side control unit 123 causes the coil 182 to generate a magnetic field that repels the magnetic pole that precedes the moving direction of the guide bar 102 and attracts the magnetic pole that follows the moving direction. Thereby, the guide bar 102 is driven and moves in the optical axis X direction. Moreover, the lens barrel side control unit 123 releases the brake 184 during the period in which the guide bar 102 moves, and does not hinder the movement of the guide bar 102.

  Further, the lens barrel side control unit 123 detects the amount of movement of the guide bar 102 by reading the linear scale 103 of the moving guide bar 102 with the encoder 186. Thereby, the lens-barrel-side control unit 123 can move the guide bar 102 with an accurate movement amount by feedback control.

  Thus, in the lens unit 100, the lens frame 190 and the lens L2 can be accurately moved in the direction of the optical axis X according to the obtained movement amount. Therefore, the linear actuator 180 can be preferably used for focusing the lens unit 100. Further, since the linear actuator 180 directly transmits the driving force to a part of the guide bar 102 exposed from the guide pipe 104, the driving efficiency is also excellent.

  The brake 184 includes a guide pin 181, a shoe 183, and an actuator 185. The guide pin 181 regulates the movement of the shoe 183 in the movement direction of the guide bar 102. In other words, the shoes 183 are supported so as to be slidable along the guide pins 181 in the directions approaching or separating from each other.

  The actuator 185 causes the shoes 183 to approach or separate from each other under the control of the lens barrel side control unit 123. When the shoes 183 are separated from each other, the guide bar 102 is separated from both the shoes 183. Therefore, the movement of the guide bar 102 is not hindered by the shoe 183. When the actuator 185 operates and the shoe 183 approaches, the guide bar 102 is sandwiched between the pair of shoes 183. Thereby, the movement of the guide bar 102 is regulated.

  The shoe 183 is slidably supported with respect to the guide pin 181. Therefore, when the shoe 183 sandwiches the guide bar 102, a load in a direction orthogonal to the longitudinal direction of the guide bar 102 does not act on the guide bar 102.

  Further, the coil 182, the brake 184, and the encoder 186 are all fixed to the fixed cylinder 110. Since the lens barrel side control unit 123 is also fixed to the fixed cylinder 110, the wiring length connecting the coil 182, the brake 184, the encoder 186, and the lens barrel side control unit 123 can be minimized.

  In addition, the coil 182, the brake 184, the encoder 186, and the lens barrel side control unit 123 do not move in both the zooming operation and the focusing operation of the lens unit 100, so that the wiring is a load on the operation of the lens unit 100. It will never be. In addition, there is no deterioration of wiring or the like due to movement.

  In the above example, the example using the guide bar 102 and the guide pipe 104 having the concentric cross-sectional shapes is described. However, the cross-sectional shapes of the guide bar 102 and the guide pipe 104 are not limited to a circular shape or a coaxial shape. Further, as long as the lens frame 70, 80, 90 and the guide bar 102 can be guided to the rear of the optical axis X, a long member that is not tubular can be used.

  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 it can be realized in any order unless it is explicitly indicated as “,” etc., and the output of the previous process is not used in the subsequent process. Regarding the operational flow of the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for the sake of convenience, it means that it is essential to carry out in this order. is not.

60, 70, 80, 90, 190 Lens frame, 74, 84, 94 Fitting hole, 76, 86, 96 U groove, 100 Lens unit, 102 Guide bar, 103 Linear scale, 104 Guide pipe, 110 Fixed cylinder, 111 Guide part, 112, 142, 152, 162, 173, 191, 195 Cam follower, 113 Lens mount, 114 Support part, 115 Rear end face, 120 Focus ring, 121, 186 Encoder, 123 Lens barrel side control part, 130 Zoom ring, 132, 144, 156 Guide groove, 140 Inner cylinder, 146, 178 Relief hole, 148 Engagement projection, 150 Middle cylinder, 154, 172, 176, 193 Cam groove, 156 Guide groove, 158 Engagement groove, 160 Outer cylinder, 165 cover tube, 170 cam tube, 171 connecting member, 174 straight groove 180 linear actuator, 181 guide pin, 182 coil, 183 shoe, 184 brake, 185 actuator, 194 coupling part, 200 single-lens reflex camera, 222 aperture device, 300 camera body, 310 housing, 320 body mount, 330 mirror box, 332 Main mirror, 334, 338 Oscillating shaft, 336 Sub mirror, 340 Focusing optical system, 342 Focusing sensor, 350 Penta prism, 352 Focus plate, 360 Viewfinder optical system, 370 Main substrate, 372 System control unit, 374 Image processing unit 382 Image sensor, 384 Low-pass filter, 390 Focal plane shutter

Claims (4)

A first guide portion extending in the optical axis direction of the optical system and fixed to the reference member;
A first holding member that is guided by the first guide portion and moves in the optical axis direction while holding the first lens;
A second guide part that is guided by the first guide part and moves in the optical axis direction;
A second holding member fixed to the second guide part and moving in the optical axis direction together with the second guide part while holding a second lens different from the first lens;
The first guide portion is fixed to the reference member at a position between the second holding member side end portion and the second holding member, and a driving force is applied to the second guide portion to A lens barrel comprising: a first drive unit that moves the second guide unit in the optical axis direction.   A second drive unit that is different from the first drive unit that moves the second holding unit in the optical axis direction, and the second drive unit transmits a driving force to the second holding member. The lens barrel according to claim 1, wherein the first drive unit releases the restraint of the second guide unit. The first guide part is cylindrical,
The first holding member moves along an outer surface of the first guide portion;
The second guide part moves along the inner surface of the first guide part,
The first drive unit transmits a driving force to a part of the second guide unit exposed from the first guide unit.
The lens barrel according to claim 1 or 2 . The lens barrel according to any one of claims 1 to 3 ,
An imaging apparatus comprising: an imaging unit that captures an image formed by the lens barrel.

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