JP2014059467A - Lenz barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel which increases the number of slits of a rotary slit plate in order to detect the rotation of a servo motor and takes into consideration the assemblability.SOLUTION: The lens barrel of the invention includes: a servo motor and a rotary slit plate having a plurality of slits formed by a gap between a plurality of blade parts. The rotary slit plate is constituted by a first component having a first fixing part constituted so as to be fixable to a shaft and one among the plurality of blade parts or a plurality of first blade part group, and a second component having a second fixing part constituted so as to be fittable to the shaft from the outside in the radial direction and fixable to the shaft, a second blade part group other than the first blade part group among the plurality of blade parts, and an engaging part constituted so as to perform a positioning of the second fixing part around the shaft for the first fixing part by engaging with the first fixing part.

Description

  The present invention relates to a lens barrel having a servo motor.

  Some zoom lens barrels used in imaging devices such as cameras and video cameras use a DC servo motor as a driving force source for zoom operation. Such a lens barrel is disclosed in, for example, Japanese Patent Application Laid-Open No. 2011-99979.

  In the lens barrel disclosed in Japanese Patent Application Laid-Open No. 2011-99979, a rotary slit plate having a plurality of slits in the circumferential direction is fixed to a shaft of a servo motor that is a driving force source for zoom operation, and a photo interrupter is used. By detecting the passage of the slit, the rotational speed of the servo motor is detected and controlled.

JP2011-99979A

  In the lens barrel disclosed in Japanese Patent Application Laid-Open No. 2011-99979, screw holes are provided around the shaft of the servo motor, and after fixing the servo motor to the motor mounting wall using screws screwed into the screw holes. The rotary slit plate is fitted into the shaft from the radial direction (side) of the shaft. In this way, the configuration in which the servo motor is screwed prior to the assembly of the rotating slit plate eliminates interference between the rotating slit plate and the tool that rotates the screw during assembly, and improves the degree of freedom in layout. ing.

  Thus, when it is the structure which inserts a rotation slit board from the radial direction of a shaft, it is necessary to provide the notch part from an outer peripheral part to a center part in a rotation slit board. Since the width of the notch is determined according to the outer diameter of the shaft of the servo motor, there is a limit to reducing it. Due to the presence of this notch, it is difficult to reduce the interval at which slits for detection by the photo interrupter are arranged. The narrower the slit interval of the rotary slit plate, the better the resolution for detecting the rotation speed of the servo motor. Therefore, the zoom operation and the like can be finely controlled, which is preferable.

  The present invention has been made in view of the above-described points, and it is an object of the present invention to provide a lens barrel that increases the number of slits of a rotary slit plate for detecting the rotation of a servo motor and takes assembly into consideration. And

  A lens barrel according to an aspect of the present invention is a rotation having a plurality of slits formed by a gap between a plurality of blade portions that are fixed to a servomotor and a shaft of the servomotor and arranged at equal intervals in the circumferential direction. A lens barrel having a slit plate and a photo interrupter that detects passage of the slit of the rotating slit plate rotating together with the shaft, wherein the rotating slit plate is configured to be fixed to the shaft. A first part having a first fixing portion and one or a plurality of first blade portion groups of the plurality of blade portions, and the shaft can be fitted from the outside in the radial direction to the shaft. By engaging the second fixed portion configured to be fixed, the second blade portion group other than the first blade portion group among the plurality of blade portions, and the first fixed portion. Having an engagement portion configured to perform positioning around said shaft with respect to the first fixing portion of the second fixing portion, constituted by the second component.

  According to the present invention, it is possible to provide a lens barrel that increases the number of slits of a rotary slit plate for detecting the rotation of a servo motor and takes assembly into consideration.

It is a part of exploded perspective view of a lens barrel. It is another part of exploded perspective view of a lens barrel. It is a disassembled perspective view of a fixed frame and a zoom drive unit. It is a longitudinal cross-sectional view along the photographic lens optical axis in the retracted state of the lens barrel. It is a longitudinal cross-sectional view along the photographic lens optical axis in the wide state of a lens barrel. It is a longitudinal cross-sectional view along the photographic lens optical axis in the zoom standard state of a lens barrel. It is a longitudinal cross-sectional view along the photographic lens optical axis in the tele state of the lens barrel. It is a perspective view which shows the state which assembled | attached the servomotor, the drive gear, and the rotation slit board to the gear case. It is A arrow directional view of FIG. It is a B arrow view of FIG. It is the disassembled perspective view which removed the servomotor from the gear case. It is a disassembled perspective view of a drive gear and a rotation slit board. It is the figure which looked at the 1st part from the base end side. It is the figure which looked at 2nd components from the base end side. It is the perspective view which looked at the 1st component and the 2nd component from the base end side. It is a figure explaining the positional relationship of a 1st blade | wing part and a screw | thread. It is a figure which shows the state which combined the 1st component and the 2nd component. It is a figure explaining the procedure which assembles a servomotor, a drive gear, and a rotation slit board to a gear case. It is a figure explaining the procedure which assembles a servomotor, a drive gear, and a rotation slit board to a gear case. It is a figure explaining the procedure which assembles a servomotor, a drive gear, and a rotation slit board to a gear case. It is a figure which shows the modification of 1st components.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each drawing used for the following description, the scale is different for each component in order to make each component large enough to be recognized on the drawing. It is not limited only to the quantity of the component described in the figure, the shape of the component, the ratio of the size of the component, and the relative positional relationship of each component.

  A lens barrel 1 according to an embodiment of the present invention is incorporated in, for example, a digital camera or the like, and is in a shooting state in which each lens frame is extended in a direction along the optical axis of a shooting optical system to perform shooting. A retractable zoom lens barrel configured to be freely displaceable to a position and a retracted position in a retracted state in which the lens frame is retracted and housed inside the fixed frame. In the following description, the optical axis of the photographing optical system in the lens barrel 1 is the optical axis O. In the direction along the optical axis O, the subject side (object side) is defined as the front, and the imaging side (image side) is defined as the rear. The direction in which each lens frame is directed forward in the lens barrel 1 is defined as a feeding direction, and the rotation direction of each lens frame is indicated by the rotation direction viewed from the front side. Furthermore, the left-right direction is indicated by the direction viewed from the front side.

  As shown in FIGS. 1 and 2, the lens barrel 1 includes a fixed frame 2 fixed to the camera body, a rotating frame 3 supported by the fixed frame 2 and driven to rotate and retreat, and rotation regulation (that is, The rotation frame 3, the moving frame 4 that advances and retreats in the optical axis O direction together with the rotating frame 3, the inner cam frame 9 that rotates together with the rotating frame 3 and moves back and forth in the optical axis O direction, and the rotation restriction state The float key 5 that moves forward and backward in the optical axis O direction together with the inner cam frame 9, and the second group zoom frame 11 that supports the second group frame 13 and the shutter frame 12 inside and moves forward and backward in the optical axis O direction in a rotationally restricted state. A guide frame 6 that moves forward and backward in the optical axis O direction in the rotation restricted state, an outer cam frame 7 that moves forward and backward in the optical axis O direction together with the guide frame 6 in the rotation restricted state, and an optical axis O direction in the rotation restricted state. A group zoom frame 8 that moves forward and backward, and a group camera that incorporates a lens barrier. , A third group frame 14 that is driven back and forth in the optical axis direction during focusing or retracting operation, a fourth group frame unit 15 that is fixedly supported on the rear surface of the fixed frame 2, and the rear side of the fourth group frame unit 15 An imaging unit 16 fixedly supported by the zoom lens unit, a zoom driving unit 17 and a focus driving unit 18 as a lens barrel driving unit, and a second zoom lens system held in the first group zoom frame 8 as a photographing optical system. A first group lens 61 that is a lens, a second group lens 62 that is a first lens of a zoom lens system held by the second group frame 13, a third group lens 63 that is a focus lens held by the third group frame 14, A fourth group lens 64 held by the fourth group frame 32, a shutter blade 65 held by the shutter frame 12, and a shutter actuator 66 are provided.

  The fixed frame 2 has a cylindrical inner peripheral portion, and a cam groove in which an inclined cam groove portion inclined with respect to the optical axis O and a circumferential groove portion formed along the circumference are connected to the inner peripheral portion. 2a and a rectilinear groove 2b formed in a direction along the optical axis O.

  Further, a zoom drive unit 17 for performing zooming driving of the photographing optical system is disposed in the unit housing portion 2d at the upper right portion of the outer periphery of the fixed frame 2, and focusing driving of the photographing optical system is performed at the unit housing portion 2e at the upper left portion of the outer periphery. A focus drive unit 18 is provided.

  As shown in FIG. 3, the zoom drive unit 17 includes a gear case 44, a servo motor 41 serving as a zoom drive actuator, a worm wheel 45, gears 46 and 47, and a long gear 48. As will be described in detail later, a drive gear 42 that is a worm screw and a rotary slit plate 70 having eight blade portions for detecting the motor rotation amount are fixed to the shaft 41b of the servo motor 41. Further, a photo interrupter 50 for detecting the passage of the blades of the rotary slit plate 70 that rotates together with the shaft 41 b of the servo motor 41 is fixed to the gear case 44.

  The gear case 44 in which the servo motor 41, the gear 46, and the like are incorporated passes through the screw holes of the fixed frame 2, and the screws 58 and 59 inserted into the screw holes 44c and 44d of the gear case 44 enter the unit housing portion 2d of the fixed frame 2. Fixed. The long gear 48 is inserted into the long gear housing chamber 2 f in a state of being engaged with the gear 47.

  The rotation of the servo motor 41 in the zoom drive unit 17 described above is transmitted from the drive gear 42 to the long gear 48 via the worm wheel 45 and gears 46 and 47. The detailed configuration of the zoom drive unit 17 will be described later.

  The focus drive unit 18 includes a focus motor 51 serving as a focus drive actuator, a unit support plate 52, a feed screw 56 and a guide shaft 53 supported by the unit support plate 52, gears 54 and 55, and a screw on the feed screw 56. And a mating nut 57.

  The focus drive unit 18 is incorporated in the unit housing portion 2 e of the fixed frame 2. The rotation of the focus motor 51 is transmitted to the feed screw 56 through the gears 54 and 55, and the nut 57 moves forward and backward along the optical axis O direction by the rotation of the feed screw 56.

  The third group frame 14 holds a third group lens 63 and is accommodated on the rear side of the inner peripheral portion of the fixed frame 2. The third group frame 14 has a guide shaft hole 14a into which the guide shaft 53 of the focus drive unit 18 is slidably fitted, and a guide protrusion 14b slidably engaged with the rectilinear groove 2c of the fixed frame 2. Yes.

  The third group frame 14 is supported by the guide shaft 53 and the rectilinear groove 2c so as to be movable back and forth in the optical axis O direction. During focusing, the third group frame 14 is driven forward and backward in the optical axis O direction by the focus drive unit 18 via the nut 57. The

  The fourth group frame unit 15 includes a ground plate 31 and a fourth group frame 32 that is fixed to the front surface portion of the ground plate 31 and holds the fourth group lens 64. The fourth group frame base plate 31 is fixed to the rear end surface of the fixed frame 2 with screws.

  The imaging unit 16 includes an imaging unit base plate 33, an imaging element unit 34 including a protective glass, an optical system filter, an imaging element, and the like, and a connection flexible circuit board 35. The imaging unit base plate 33 is fixed in a state of being overlapped on the rear surface of the fourth group frame base plate 31 behind the fixed frame 2.

  The rotating frame 3 is a cylindrical frame member whose both ends are opened in the direction of the optical axis O, and the outer periphery of the cylindrical portion of the rotating frame 3 is fitted into the inner peripheral portion of the fixed frame 2 so as to be able to rotate and advance and retract. A cam follower 3 b that is slidably fitted in the cam groove 2 a of the fixed frame 2 and a gear portion 3 a that meshes with the long gear 48 are formed on the outer peripheral rear portion of the rotating frame 3.

  A cam groove 3c, which is a first cam groove (second cam means) inclined with respect to the optical axis O, and a first straight advance formed in a direction along the optical axis O at the inner peripheral portion of the rotating frame 3 A rectilinear groove 3d which is a groove (first cam means) is provided, and a circumferential groove 3e along the circumferential direction is further provided at the inner peripheral front end of the rotating frame 3.

  When setting up the lens barrel 1 from the retracted state to the photographing state, the long gear 48 is rotationally driven by the servo motor 41. The rotating frame 3 is rotationally driven via the gear portion 3a, and is fed forward from the retracted position via the cam follower 3b by the cam groove 2a to reach the wide position in the photographing state. Thereafter, when the long gear 48 is further driven to rotate in the same direction, the rotating frame 3 moves to the tele position without moving back and forth in the optical axis O direction as the cam follower 3b moves along the circumferential direction on the cam groove 2a. Move.

  The moving frame 4 is a cylindrical frame member that is open at both ends in the direction of the optical axis O, and the outer periphery of the cylindrical portion of the moving frame 4 is rotatable relative to the inner periphery of the cylindrical portion of the rotating frame 3. It is inserted in a regulated (rotation blocked) state. A guide projection 4a that slidably engages with the rectilinear groove 2b of the fixed frame 2 on the outer periphery of the rear end of the moving frame 4, and a peripheral groove of the rotary frame 3 along the outer periphery of the front end. A protrusion 4e that slidably engages with 3e, a groove that penetrates the inner and outer periphery of the circumferential cylindrical portion, and a cam groove 4d that inclines in the direction of the optical axis O and a rectilinear groove 4b that extends in the direction of the optical axis O. 4c.

  The movable frame 4 is rotationally restricted (rotation prevented) by the rectilinear groove 2b of the fixed frame 2, and is bayonet-coupled by the protrusion 4e and the circumferential groove 3e so as to be rotatable relative to the rotating frame 3. Therefore, when the rotating frame 3 rotates and advances / retreats, the moving frame 4 moves forward / backward in the optical axis direction together with the rotating frame 3 in a rotation restricted state.

  The inner cam frame 9 is a cylindrical frame member whose both ends are opened in the direction of the optical axis O, and is fitted into the inner peripheral portion of the outer cam frame 7 and rotates together (in a state where relative rotation is restricted). , Both ends are opened in the direction of the optical axis O), and advances and retreats in the direction of the optical axis O. The inner cam frame 9 includes a cam follower 9b, which is a first cam follower projecting outward at the outer peripheral rear portion, a guide projection 9a integrally provided at the outer tip of the cam follower, and an optical axis on the outer peripheral portion. And linear rectilinear guide protrusions 9e which are rotation transmitting means along the O direction. In addition, the cam groove 9c and cam grooves 9da and 9db that are inclined with respect to the optical axis O, the circumferential groove 9f along the circumferential direction, and the second group frame 13 are rotated to the retracted position on the inner circumferential portion of the inner cam frame 9. The escape part when it is done is provided.

  The cam follower 9b of the inner cam frame 9 is slidably engaged with the cam groove 4d of the moving frame 4, and the guide projection 9a is slid into the rectilinear groove 3d of the rotating frame 3 through the cam groove 4d of the moving frame 4. Engage freely. Therefore, the inner cam frame 9 advances and retreats in the direction of the optical axis O relative to the moving frame 4 while rotating together with the rotating frame 3.

  The float key 5 is a frame member formed in a disc shape having an opening in the center, and the disc-like portion is fitted into the moving frame 4 and advances and retreats in the direction of the optical axis O in a rotation restricted state. The float key 5 has a guide protrusion 5a protruding outward from the disk-shaped part, a protrusion 5a 'protruding in a disk-like outer periphery in a pair, and a linear shape protruding forward along the optical axis O direction. Of the straight guide 5b, and a protrusion 5c projecting outward from the outer peripheral portion of the straight guide 5b. A light shielding plate is attached to the disc-shaped portion of the float key 5.

  The guide protrusion 5 a of the float key 5 is slidably engaged with the rectilinear groove 4 b of the moving frame 4. Further, the projection 5a ′ is loosely fitted in the rectilinear groove 4c of the moving frame 4 and shields unnecessary light entering from the rectilinear groove 4c from the front of the lens frame to some extent. The rectilinear guide 5b penetrates the inner peripheral portion of the inner cam frame 9, and the projection 5c on the rectilinear guide 5b is slidably engaged with the peripheral groove 9f of the inner cam frame 9 in the penetrating state. Accordingly, the float key 5 moves forward and backward in an integrated state with the inner cam frame 9 and the optical axis O direction while being restricted by the moving frame 4.

  The second group zoom frame 11 is formed of a cylindrical frame member, and the outer peripheral portion thereof is fitted into the inner peripheral portion of the inner cam frame 9 so as to be relatively rotatable. Inside the second group zoom frame 11, the second group frame 13 can be moved back and forth at right angles to the photographing optical path, and is supported in a state where it can be rotated to the entry position and the retracted position. The shutter frame 12 is supported in a state in which the shutter frame 12 is spring-biased rearward in a state in which the shutter frame 12 can advance and retreat in the optical axis O direction.

  On the outer periphery of the second zoom frame 11, a straight groove 11c along the optical axis O direction on the left and right, two cam followers 11a as a third cam follower, and two cam followers as a pair are arranged along the optical axis O direction. 11ba and 11bb are provided. Further, a support shaft (not shown) parallel to the optical axis O that rotatably supports the second group frame 13 is provided on the inner peripheral portion.

  The straight guide 5b of the float key 5 is slidably inserted into the straight groove 11c, the cam follower 11a is engaged with the cam groove 9c of the inner cam frame 9, and the cam followers 11ba and 11bb are engaged with the cam grooves 9da and 9db, respectively. The second group zoom frame 11 is fitted in the inner periphery of the inner cam frame 9. Accordingly, the second group zoom frame 11 is moved relative to the moving frame 4 and the inner cam frame 9 as the inner cam frame 9 rotates and advances and retreats in a state where the rotation is restricted (rotation prevented) by the float key 5. It moves forward and backward in the direction of the optical axis O by the amount of movement obtained by adding the amount of movement by the cam grooves 9c and 9da to the amount.

  A compression coil spring 26 is inserted between the front end surface of the second group zoom frame 11 and the first group zoom frame 8, and the second group zoom frame 11 is urged rearward and the first group zoom frame 8 forward. Since it is in the state, the cam followers 11a, 11ba, 11bb and the cam follower 24 and the cam grooves with which they are engaged are removed.

  The guide frame 6 is formed of a cylindrical frame member having both ends opened in the direction of the optical axis O, and the cylindrical portion of the guide frame 6 is fitted into the inner peripheral side of the movable frame 4. A pin member 25 that penetrates from the outer peripheral portion of the rear end of the guide frame 6 to the inner periphery is press-fitted and fixed. In the inner periphery of the guide frame 6, there are rectilinear grooves 6c and 6b, which are third rectilinear grooves (fourth cam means) along the optical axis O direction, and a peripheral groove 6a along the rear end circumferential direction. Provided.

  The pin member 25 that is press-fitted into the rear end portion of the guide frame 6 includes a guide pin portion 25c that protrudes toward the inner peripheral side of the guide frame 6, a guide pin portion 25b that protrudes toward the outer peripheral side, and a tip portion of the guide pin portion 25b. The cam follower 25a which is the second cam follower formed in the above is formed.

  The outer cam frame 7 is made of a cylindrical frame member whose both ends are opened in the direction of the optical axis O, the outer peripheral rear end of the cylindrical portion is positioned at the inner rear end of the cylindrical portion of the guide frame 6, and the outer peripheral portion of the cylindrical portion is The inner peripheral portion of the first group zoom frame 8 is fitted and inserted, and the outer peripheral portion of the cylindrical portion of the inner cam frame 9 is inserted into the inner peripheral portion of the outer cam frame 7. The outer cam frame 7 includes a circumferential groove 7b and a protrusion 7c on the outer peripheral portion of the rear end, a cam groove 7a inclined on the outer peripheral portion with respect to the optical axis O direction, and a rectilinear groove on the inner peripheral portion along the optical axis O direction. 7d. The rectilinear guide protrusion 9e of the inner cam frame 9 is slidably engaged with the rectilinear groove 7d of the outer cam frame 7, and the outer cam frame 7 is rotatable with the inner cam frame 9, that is, the outer cam frame 7 and the inner cam. The relative rotation of the frame 9 is restricted and supported. The outer cam frame 7 is provided with a contact inclined surface 7e on the front end surface in the direction of the optical axis O to contact the driven arm provided on the barrier ring 22 in order to drive the barrier blade 23 in the closing direction when retracted. ing. The rear end surface of the outer frame 7 is provided with a notch 7f for avoiding interference with the leg portion extending in the outer diameter direction having the cam followers 9a and 9b of the inner cam frame 9.

  The pin member 25 is press-fitted into the pin hole at the rear end of the guide frame 6 from the outer peripheral side, and penetrates the guide pin portion 25c. The penetrating guide pin portion 25 c is slidably engaged with the circumferential groove 7 b of the outer cam frame 7. Further, the guide pin portion 25b and the cam follower 25a at the projecting portion of the pin member 25 that is press-fitted into the guide frame 6 to the outer side of the guide frame 6 are a rectilinear groove 4c of the moving frame 4 and a cam groove of the rotating frame 3. 3c is slidably engaged with each other.

  The first group zoom frame 8 is made of a cylindrical frame member, and the outer periphery of the cylindrical portion is fitted into the inner circumference of the guide frame 6, and the outer cam frame 7 is fitted into the inner circumference of the first group zoom frame 8. A cam follower 24, which is a fourth cam follower projecting inward on the inner peripheral side, is press-fitted and fixed to the rear end of the group zoom frame 8, and the cam follower 24 is press-fitted and provided with a protrusion 8a projecting in the outer diameter direction. , Another protrusion 8b protruding in the outer diameter direction is provided at the same outer peripheral rear end.

  The first group zoom frame 8 is fitted on the outer periphery of the outer cam frame 7 by engaging the cam follower 24 with the cam groove 7 a of the outer cam frame 7. The projections 8 a and 8 b of the first group zoom frame 8 are engaged with the inner circumferential straight grooves 6 c and 6 b of the guide frame 6, and the projection 7 c of the outer cam frame 7 is engaged with the circumferential groove 6 a of the guide frame 6. In this state, the first group zoom frame 8 and the outer cam frame 7 are fitted into the inner peripheral portion of the guide frame 6.

  Accordingly, the guide frame 6 and the first group zoom frame 8 are supported by the moving frame 4 so as to be movable back and forth in the direction of the optical axis O in a rotation-restricted (rotation-inhibited) state, and the outer cam frame 7 is supported in the direction of the guide frame 6 and the optical axis O. And is rotationally driven by the rotary frame 3 together with the inner cam frame 9. Then, when the guide frame 6 is advanced and retracted and rotated by the rotating frame 3, the group zoom frame 8 is moved by adding the moving amount by the cam groove 7a to the relative moving amounts of the rotating frame 3 and the guide frame 6. Only moves forward and backward in the direction of the optical axis O.

  The first group cap unit 20 includes a first group cap 21, a barrier ring 22, a barrier blade 23, and a barrier urging spring (not shown).

  The first group cap 21 has a central opening 21 a that is opened and closed by the barrier blade 23, and is attached to the front portion of the first group zoom frame 8. The barrier ring 22 is supported on the front surface of the group zoom frame 8 so as to be rotatable about the optical axis O, and opens and closes the barrier blades 23 in conjunction with the rotation of the outer cam frame 7. The barrier blade 23 includes a pair of barrier blades that are pivotally supported by the support shaft 21b of the first group cap. The barrier blade 23 is accommodated between the first group cap 21 and the barrier ring 22 and is biased in the opening direction by the barrier bias spring. ing.

  Next, the advance / retreat operation of the lens barrel 1 having the above-described configuration will be described.

  When the lens barrel 1 is in the retracted state, as shown in FIG. 4, the lens frame members are retracted into the fixed frame 2 in an overlapping state. In this retracted state, the second group frame 13 is rotationally driven by a retraction cam 32a provided on the fourth group frame 32, and the second group lens 62 having the optical axis O 'is retracted from the photographing optical path. The lens barrier 23 provided at the tip of the zoom lens barrel is also closed.

  When the lens barrel 1 is set from the retracted state to a wide state where photographing can be performed, the servo motor 41 is driven to rotate, and the rotating frame 3 is driven to rotate clockwise. The rotating frame 3 is extended in the direction of the optical axis O to the wide position while rotating by the cam groove 2a (FIG. 5). At the same time, the contact of the contact inclined surface 7e of the outer cam frame 7 that has been in contact with the driven arm of the barrier ring 22 is released, and the barrier blade 23 is opened in conjunction with it.

  As the rotary frame 3 rotates and moves, the float key 5 moves in the direction of the optical axis O. The inner cam frame 9 moves in the direction of the optical axis O while rotating. It is drawn out to the position. When the second group zoom frame 11 is extended, the cam follower 13b of the second group frame 13 is rotationally driven along the retracting cam 32a. Further, when the second group zoom frame 11 is separated, the second group frame 13 is rotated counterclockwise and the second group lens 62 is moved. Enter the shooting optical path. Further, the shutter frame 12 is moved to a position relatively rearward with respect to the second zoom frame 11 by the biasing force of the biasing spring.

  On the other hand, since the guide frame 6 is also extended with the rotation of the rotary frame 3 and the movement in the optical axis O direction, the group zoom frame 8 is extended to the wide position via the outer cam frame 7 that rotates and advances. When the lens barrel 1 is in the wide state, the second group zoom frame 11 is closer to the image sensor unit 34 than the position of the first group lens 61, and the rear end surface of the inner cam frame 9 is the outer cam frame 7. It is on the rear side in the optical axis O direction from the rear end face. The front end surface of the inner cam frame 9 is on the front side in the optical axis O direction with respect to the rear end surface of the outer cam frame 7, and the front end surface of the inner cam frame 9 is the front end surface and the rear end surface of the outer cam frame 7. Between. At this time, the front end surface of the rotating frame 3 as an external component is in front of the front end surface of the fixed frame 2, the rear end surface of the rotating frame 3 is in the fixed frame 2, and the front end surface of the guide frame 6 Is in front of the front end surface of the rotating frame 3, the rear end surface of the guide frame 6 is in the rotating frame 3, and the front end surface of the group zoom frame 8 is in front of the front end surface of the guide frame 6. The rear end surface of the zoom frame 8 is in the guide frame 6, and these extend in the direction of the optical axis O in a so-called bowl shape.

  When the second group zoom frame 11 and the first group zoom frame 8 reach the above-described wide position where the photographing is possible, when the lens barrel 1 is brought into a zoom standard state where the photographing can be performed, or in the tele state, the rotating frame 3 is further rotated. The second group zoom frame 11 and the first group zoom frame 8 are moved forward and backward toward the respective zooming positions (FIGS. 6 and 7). When the lens barrel 1 is in the tele state, the second group zoom frame 11 is located closer to the first group lens 61 than the position of the image sensor unit 34. Further, the front end surface of the inner cam frame 9 is positioned on the front side in the optical axis O direction with respect to the front end surface of the outer cam frame 7. The rear end surface of the inner cam frame 9 is located on the rear side in the optical axis O direction with respect to the front end surface of the outer cam frame 7.

  In each zoom state of the lens barrel 1, the third group frame 14 is extended so that the third group lens 63 is positioned at the focusing position via the focus driving unit 18 by the rotational drive of the focus motor 51.

  Next, the detailed configuration of the zoom drive unit 17 will be described.

  As shown in FIGS. 8 to 11, the servo motor 41 is a DC servo motor configured to rotationally drive a round bar-shaped shaft 41 b protruding from the main body as an example in the present embodiment. The servo motor 41 has a substantially flat seat surface portion 41c provided in the main body, and is in contact with the gear case 44 at the seat surface portion 41c.

  A shaft 41b protrudes from the seat surface portion 41c. The shaft 41b is disposed at a center portion of the seat surface portion 41c so as to be substantially orthogonal to the seat surface portion 41c.

  Further, one or a plurality of screw holes 41 a for fixing the main body portion to the gear case 44 are provided around the shaft 41 b in the seat surface portion 41 c. In the present embodiment, as an example, a pair of screw holes 41a is provided in the seat surface portion 41c. The pair of screw holes 41a are disposed so as to be spaced apart from the shaft 41b by a substantially equal predetermined distance so that the shaft 41b is located therebetween. In this embodiment, the pair of screw holes 41a are disposed in a substantially symmetrical positional relationship with the shaft 41b as the axis of symmetry. However, the positional relationship between the pair of screw holes 41a and the shaft 41b is the same as in the present embodiment. It is not limited to this and is arbitrary.

  The gear case 44 is provided with a motor fixing wall 44e to which the servo motor 41 is fixed. On one surface of the motor fixing wall 44e, a seating portion 44f that contacts the seating surface portion 41d of the servomotor 41 is formed.

  The motor fixing wall 44e is formed with a shaft insertion portion 44f through which the shaft 41b penetrates the motor fixing wall 44e when the seating surface portion 41d of the servo motor 41 is in contact with the seating portion 44f. The shaft insertion portion 44f may have a hole-like shape with a closed periphery, or may have a notch-like shape that is partially open at the side of the motor fixing wall 44e.

  In this embodiment, as an example, the shaft insertion portion 44f has an elongated slit shape, and one end in the longitudinal direction is open at the side portion of the motor fixing wall 44e. As described above, the shaft insertion portion 44f is formed to be open at the side of the motor fixing wall 44e, so that the drive gear 42 having a diameter larger than the opening diameter of the shaft insertion portion 44f is fixed to the tip portion of the shaft 41b. In this state, the servo motor 41 can be attached to and detached from the gear case 44.

  The motor fixing wall 44e is formed with a screw insertion hole 44a penetrating the motor fixing wall 44e at a position corresponding to the screw hole 41a when the seat surface portion 41d of the servo motor 41 is in contact with the seating portion 44f. Yes. In the present embodiment, a pair of screw insertion holes 44a is formed in the motor fixing wall 44e.

  The servo motor 41 is fixed to the motor fixing wall 44e by inserting the screw 49 into the screw insertion hole 44a from the opposite side of the seating portion 44f of the motor fixing wall 44e and screwing into the screw hole 41a of the servo motor 41. The

  A drive gear 42 and a rotary slit plate 70 are fixed to the shaft 41 b of the servo motor 44. The rotary slit plate 70 is fixed to the shaft 41b between the drive gear 42 and the seat surface portion 41c. Note that the rotary slit plate 70 may be disposed closer to the distal end side of the shaft 41 b than the drive gear 42.

  The drive gear 42 is fixed to the tip of the shaft 41b by, for example, press-fitting or an adhesive. An engagement portion 42 a that engages with a rotary slit plate 70 described later is formed at the base end portion of the drive gear 42. In the present embodiment, as an example, the engaging portion 42a is a convex portion protruding in the proximal direction along the shaft 41b. Here, the base end portion of the drive gear 42 is an end portion on the side close to the base end of the shaft 41b in a state where the drive gear 42 is fixed to the shaft 41b. Refers to the end close to the main body.

  In the present embodiment, as an example, the drive gear 42 is a worm that is a screw-shaped gear, but the form of the drive gear 42 is appropriately selected according to the shape of the lens barrel 1, and the drive gear 42 42 may be other forms such as a spur gear or a helical gear.

  When the rotary slit plate 70 is fixed to the shaft 41b, the plate-like portion substantially orthogonal to the rotation center axis (the center axis of the shaft 41b) and the rotation center axis of the plate-like portion are substantially the same. On the diameter, it is configured to have a plurality of through-holes that are arranged at substantially equal intervals in the circumferential direction. Here, the substantially equal interval in the circumferential direction means that when the rotating slit plate 70 is rotating at a constant rotational speed, the slit passing detection period by the photo interrupter 50 is arranged to be constant. Point to.

  The lens barrel 1 of the present embodiment is configured to detect the rotational speed of the servo motor 44 by detecting the passage of the slit by a photo interrupter 50 fixed to the gear case 44. As described above, since the technology for detecting the rotational speed of the motor by detecting the passage of the slit provided in the plate-like portion that rotates together with the shaft of the motor is known, detailed description thereof is omitted. To do.

  In the present embodiment, as an example, as shown in FIG. 11, the rotary slit plate 70 has a plurality of blade-shaped (petal-shaped, blade-shaped) blade portions extending radially from the rotation center axis. The blades are arranged at substantially equal intervals with a predetermined gap in the circumferential direction. The plurality of blade portions are disposed at substantially the same position in the axial direction of the rotation center axis. In other words, the plurality of blade portions are disposed on the same plane that is substantially orthogonal to the rotation center axis.

  As described above, in the rotary slit plate 70 of the present embodiment, the gaps between the blade portions in which the plurality of blade portions are arranged at equal intervals in the circumferential direction on the same plane constitute a slit that is a through hole. Yes. In the present embodiment, as an example, the rotary slit plate 70 is configured to have eight blade portions disposed at a period of about 45 degrees.

  A specific configuration of the rotary slit plate 70 of the present embodiment will be described below. As shown in FIG. 12, the rotary slit plate 70 is constituted by a combination of two parts that can be divided. Hereinafter, one of the two components constituting the rotary slit plate 70 is referred to as a first component 71, and the other part is referred to as a second component 72.

  In a state where the rotary slit plate 70 is fixed to the shaft 41 b, the first component 71 is disposed closer to the drive gear 42 than the second component 72.

  The first component 71 has a first fixing portion 71 b configured to be positionally fixable with respect to the shaft 41 b, and is a first blade made up of some blade portions of the plurality of blade portions of the rotary slit plate 70. It has a portion 71a. The 1st blade | wing part 71 is arrange | positioned so that it may extend from the 1st fixing | fixed part 71b.

  On the other hand, the second component 72 has a second fixing portion 72b configured to be fixable in position relative to the shaft 41b, and is not the first blade portion 71a among the plurality of blade portions of the rotary slit plate 70. It has the 2nd blade | wing part 72a which consists of all the blade | wing parts. The 2nd blade | wing part 72a is arrange | positioned so that it may extend from the 2nd fixing | fixed part 72b.

  In other words, the plurality of blade portions of the rotary slit plate 70 are divided into two groups including the first blade portion 71 a and the second blade portion 72 a, and the first blade portion 71 a that is one group is the first component 71. The second blade portion 72a which is the other group belongs to the second component 72. In addition, the 1st blade | wing part 71a may be comprised by one blade | wing part, and may be comprised by the several blade | wing part.

  In the present embodiment, as an example, of the eight blade portions of the rotary slit plate 70, four blade portions disposed at a period of about 90 degrees around the rotation center axis are the first blade portions 71a, and the rest The four blade portions arranged at a period of approximately 90 degrees are the second blade portions 72a.

  Here, in the present invention, conditions for distributing the plurality of blade portions of the rotary slit plate 70 to the first blade portion 71a and the second blade portion 72a will be described. The first blade portion 71a rotates the screw 49 and the screw 49 when the first component 71 having the first blade portion 71a fixes the servo motor 41 fixed to the shaft 41b to the motor fixing wall 44e. Therefore, the arrangement is selected so as not to interfere with the tool (screw driver). The remaining blade part is selected as the second blade part 72a.

  For example, in the present embodiment, as shown in FIG. 16, the first blade portion 71 a is composed of four blade portions arranged at a period of approximately 90 degrees, and therefore the shaft 41 b to which the first component 71 is fixed is provided. By appropriately turning, it is possible to create a state where the screw 49 (screw hole 41a) and the first blade portion 71a do not overlap when viewed from the direction along the rotation center axis (shaft 41b). In this state, the tool 80 as a screw driver and the first blade portion 71a do not interfere with each other.

  Note that when the rotary slit plate 70 is configured to have eight blade portions as in the present embodiment, one to seven blade portions are selected as the first blade portion 71a.

  As described above, the first component 71 includes the first fixing portion 71b and the first blade portion 71a, which are formed by integral molding of resin.

  As shown in FIGS. 13 and 15, the first fixing portion 71b of the first component 71 has a fitting hole 71c having an inner diameter that fits into the shaft 41b. The fitting hole 71c has an inner diameter that is fitted to the outer shape of the shaft 41b without a gap. Such fitting without a gap is referred to as interference fitting or light press fitting.

  In the present embodiment, as an example, the first fixing portion 71b is configured to be fitted to the shaft 41b from the outside in the radial direction. Specifically, the first fixing portion 71b is formed with a notch portion 71d formed so as to reach the fitting hole 71c from the outer peripheral surface of the first fixing portion 71b. Due to the presence of the cutout portion 71d, the fitting hole 71c is opened outward in the radial direction. The notch portion 71d is provided at a position that does not overlap the first blade portion 71a extending from the first fixing portion 71b in the circumferential direction.

  The width of the notch 71d is narrower than the diameter of the fitting hole 71c. The shaft 41b can be inserted into the fitting hole 71c by pushing in the shaft 41b from the outside of the first fixed portion 71b so as to widen the notch 71d.

  The width of the notch 71d is set so that the deformation of the first fixing portion 71b in the state where the shaft 41b is sandwiched in the notch 71d is within the elastic deformation region.

  Note that the first component 71 may not have the notch 71d. In this case, the first component 71 is fixed to the shaft 41b by press-fitting the tip of the shaft 41b into the fitting hole 71c.

  In a state where the shaft 41b is fitted in the fitting hole 71c, the width of the notch portion 71d is narrower than the outer diameter of the shaft 41b. Therefore, an external force that deforms the first fixing portion 71b to widen the notch portion 71d is generated. Unless added, the fitting state between the shaft 41b and the first fixing portion 71b will not be removed.

  The notch portion 71d of the first fixing portion 71b engages with a convex engaging portion 42a that protrudes from the drive gear 42 toward the first component 71 along the rotation center axis. Due to the engagement between the notch 71d and the engaging portion 42a, the first component 71 is positioned around the rotation center axis with respect to the drive gear 42, and relative rotation between the two is prevented. That is, the notch 71d is a part for introducing the shaft 41b into the fitting hole 71c, and is also an engaging part for positioning the drive gear 42 and the first component 71.

  The 1st blade | wing part 71a is a site | part extended to a predetermined distance from a rotation center axis toward the radial direction outer side from the outer peripheral surface of the 1st fixing | fixed part 71b. In the present embodiment, as described above, the four first blade portions 71a are arranged at substantially equal intervals in the circumferential direction.

  The first blade portion 71a is disposed at the end of the first fixed portion 71b opposite to the drive gear 42 in a state where the first fixed portion 71b is fixed to the shaft 41b. In other words, the first blade portion 71a is disposed at the end portion of the first fixed portion 71b on the side close to the second component 72 in the direction along the rotation center axis. This is because the first blade portion 71a and the second blade portion 72a provided on the second component 72 are arranged on the same plane by arranging the first blade portion 71a at a position close to the second component 72. This is to make it easier.

  In the illustrated embodiment, the first blade portion 71a has a shape that expands in a fan shape toward the outer side in the radial direction when viewed from the rotation center axis direction (viewpoint in FIG. 13). The first blade portion 71a may extend in the radially outward direction while maintaining substantially the same width.

  Further, in a state where the first fixing portion 71b is fixed to the shaft 41b, a second engaging portion of the second component 72 described later is provided at an end portion of the first fixing portion 71b opposite to the drive gear 42. A first engaging portion 71e configured to position the first component 71 and the second component 72 around the rotation center axis by engaging with 72e is formed. Here, the positioning of the engaging portion 71e of the first component 71 and the engaging portion 72e of the second component 72 is such that the first blade portion 71a and the second blade portion 72a are arranged on substantially the same plane, and It is set to be arranged at substantially equal intervals in the direction.

  In addition, the engagement between the engagement part 71e of the first part 71 and the engagement part 72e of the second part 72 is performed by the first part 71 and the second part 72 along the rotation center axis. It is comprised so that it may be performed by moving relatively.

  Specifically, the first engaging portion 71e is provided at the end portion of the first fixing portion 71b on the side close to the second component 72, and the base portion of the second blade portion 72a described later is the rotation center axis. It is a concave-shaped site | part inserted inside from the direction along. As shown in FIG. 13, the first engagement portion 71e is disposed at a position that is 45 degrees out of phase with the first blade portion 71a when viewed from the direction of the rotation center axis. Further, in the concave first engaging portion 71e of the present embodiment, the first blade portion 71a and the second blade portion 72a are located on substantially the same plane when the second blade portion 72a is fitted therein. Has depth. In the present embodiment, the first engagement portion 71e is not formed at the position where the notch portion 71d is formed.

  As described above, the second component 72 includes the second fixing portion 72b and the second blade portion 72a, which are formed by integral molding of resin.

  As shown in FIGS. 14 and 15, the second fixing portion 71b of the second component 72 has a fitting hole 72c having an inner diameter that fits into the shaft 41b. The fitting hole 72c has an inner diameter that is fitted to the outer shape of the shaft 41b without a gap. Such a fitting without a gap is referred to as an interference fit.

  The 2nd fixing | fixed part 72b is comprised so that fitting to the shaft 41b from a radial direction outer side is possible. Specifically, the second fixing portion 72b is formed with a cutout portion 72d formed so as to reach the fitting hole 72c from the outer peripheral surface of the second fixing portion 72b. Due to the presence of the cutout portion 72d, the fitting hole 72c is in a state of being opened radially outward of the second fixing portion 72b. The cutout portion 72d is provided at a position that does not overlap the second blade portion 72a extending from the second fixed portion 72b in the circumferential direction.

  The width of the notch 72d is narrower than the diameter of the fitting hole 72c. The shaft 41b can be fitted into the fitting hole 72c by pushing in the shaft 41b from the outside of the second fixed portion 72b so as to widen the notch 72d.

  The width of the notch 72d is set so that the deformation of the second fixing portion 72b in the state where the shaft 41b is sandwiched in the notch 72d is within the elastic deformation region.

  In a state where the shaft 41b is fitted in the fitting hole 72c, the notch 72d is narrower than the outer diameter of the shaft 42b, and the fitting hole 72c and the shaft 41b are in an interference fit relationship. As long as an external force that deforms the second fixing portion 72b is applied so as to expand the notch portion 71d, the fitting state between the shaft 41b and the second fixing portion 72b is not released.

  The 2nd blade | wing part 72a is a site | part extended to a predetermined distance from a rotation center axis toward the radial direction outer side from the outer peripheral surface of the 2nd fixing | fixed part 72b. The second blade portion 72a has substantially the same shape as the first blade portion 71a in the detection range of the photo interrupter 50.

  In the present embodiment, as described above, the four second blade portions 72a are arranged at substantially equal intervals in the circumferential direction. The second blade portion 72a is disposed at an end portion of the second fixing portion 72b on the side close to the first component 71 in a state where the second fixing portion 72b is fixed to the shaft 41b.

  Further, the second fixing portion 72b is provided with a second engaging portion 72e that engages with the first engaging portion 71e provided on the first component 71 described above. The second engaging portion 72e is configured to position the first component 71 and the second component 72 around the rotation center axis by engaging with the engaging portion 71e of the first component 71.

  As described above, in the present embodiment, the base portion of the second blade portion 72a is configured to fit into the concave engagement portion 71e formed in the first component 71, and accordingly, the second The base part of the blade part 72a functions as the engaging part 72e.

  In the present embodiment, in a state where both the first component 71 and the second component 72 are fitted to the shaft 41b, the first component 71 and the second component 72 are slid along the shaft 41b in a relatively approaching direction. Thus, the engaging portion 71e of the first component 71 and the engaging portion 72e of the second component 72 are engaged.

  And in the state which the engaging part 71e of the 1st component 71 and the engaging part 72e of the 2nd component 72 engaged, as shown in FIG. 17, the 2nd blade | wing part 72a is with respect to the 2nd blade | wing part 71a. Thus, the phase is disposed at a position shifted by 45 degrees. That is, the eight blade portions constituted by the first blade portion 71a and the second blade portion 72a are arranged at substantially equal intervals in the circumferential direction. Further, in this state, the first blade portion 71a and the second blade portion 72a are arranged on the same plane substantially orthogonal to the rotation center axis in the rotation center axis direction.

  As described above, the rotary slit plate 70 is configured by combining the first component 71 and the second component 72.

  Next, a procedure for assembling the servo motor 41, the drive gear 42, and the rotary slit plate 70 to the gear case 44 in the zoom drive unit 17 will be described.

  First, as shown in FIG. 18, the drive gear 42 and the first component 71 are press-fitted into the shaft 41 b of the servo motor 41 and fixed. At this time, the engaging portion 42a of the drive gear 42 and the notched portion 71d of the first component 71 are engaged.

  Next, as shown in FIG. 19, the shaft 41b is inserted into the slit-shaped shaft insertion portion 44f of the motor fixing wall 44e, the servo motor 41 is disposed at a predetermined position, and the servo motor 41 is fixed to the motor by screws 49. Fix to the wall 44e. At this time, as described above, the first blade portion 71 a is arranged so as not to interfere with the screw 49 and the tool 80 for turning the screw 49.

  Next, as shown in FIG. 20, the second component 72 is fitted onto the shaft 41b. In this state, the first component 71 and the second component 72 are separated from each other in the direction of the rotation center axis. Next, the second part 72 is slid along the shaft 41b in a direction approaching the first part 71, and the engaging part 71e of the first part 71 and the engaging part 72e of the second part 72 are engaged. Let By this operation, the rotary slit plate fixed on the shaft 41b is assembled.

  In the lens barrel 1 of the present embodiment described above, a part of the plurality of blade portions for forming the slit in the rotary slit plate 70 is provided as the first blade portion 71a in the first component, and the rest is provided. The second blade part 72a is provided in the second part. And the 2nd component 72 is comprised so that fitting to the shaft 41b from a radial direction outer side is possible.

  As described above, the blade portions are divided into two groups and provided in the first component 71 and the second component 72, so that in each of the blade portion groups, a portion where the interval between adjacent blade portions is wide is generated. If the notches 71d and 72d for fitting the shaft 41 to the through holes 71e and 72e are provided at the locations where the distance between the blades is wide, the presence of the notches 71d and 72d surrounds the blades. There is no hindrance when densely arranged in the direction.

  Therefore, according to the present embodiment, the first part 71 and the second part 72 constituting the rotary slit plate 70 can be fitted to the shaft from the outside in the radial direction, thereby improving the assemblability and the rotary slit. The number of slits in the plate can be increased. In addition, since the freedom degree of arrangement | positioning of the servomotor 41 improves by the improvement of assembly property, this invention contributes also to size reduction of a lens-barrel.

  Further, the first blade portion 71 a provided in the first component 71 is arranged so as not to interfere with the screw 49 and the tool 80 for turning the screw 49. Therefore, in the present embodiment, the servo motor 41 can be fixed to the motor fixing wall 44e in a state where the first component 71 is fixed to the shaft 41b.

  In the present embodiment, the number of blade portions of the rotary slit plate 70 is eight, but the number of blade portions is not limited to this embodiment, and may be more or less than eight. Good.

  Further, the first part 71 constituting the rotary slit plate 70 may be formed integrally with the drive gear 42. This modification is shown in FIG. As shown in FIG. 21, in this modification, the fixing portion 71 b of the first component 71 is integrated with the drive gear 42.

  Even if it is such a modification, the effect similar to embodiment mentioned above is acquired. In addition, since the screw 49 and the tool 80 for turning the screw 49 do not interfere with the first blade portion 71a, the servo motor 41 with the drive gear 42 (and the first component 71) fixed to the shaft 41b. Can be fixed to the motor fixing wall 44e.

  Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and a lens mirror accompanying such a change. The cylinder is also included in the technical scope of the present invention.

  The lens barrel according to the present invention is not limited to a form provided in a so-called digital camera, but may be a form provided in an electronic device having an imaging function such as a mobile communication terminal, a game machine, or a digital media player. Needless to say.

1 lens barrel,
2 fixed frame,
3 rotating frame,
3c cam groove,
3d straight groove,
4 Moving frame,
4b, 4c Straight groove,
4d cam groove,
5 Float key,
5b Straight guide,
6 guide frame,
6c, 6b Straight groove,
7 Outer cam frame,
7a Cam groove,
7d Straight groove,
8 Group zoom frame,
9 Inner cam frame,
9b Cam follower,
9c, 9da, 9db cam groove,
9e Straight guide protrusion,
11 Two-group zoom frame,
11a, 11ba, 11bb cam followers,
12 shutter frame,
13 Second group frame,
14 Three-group frame,
15 Fourth group frame unit,
16 imaging unit,
17 Zoom drive unit,
18 Focus drive unit,
20 group cap unit,
24 Cam follower,
25a Cam follower,
41 Servo motor (zoom motor),
41a screw holes,
41b shaft,
41c bearing surface,
42 Drive gear (worm screw),
42a engaging portion,
44 gear case,
44a Screw insertion hole,
44c screw holes,
44d screw hole,
44e Motor fixing wall,
44f Shaft insertion hole,
45 worm wheel,
46 gear,
47 gear,
48 long gear,
49 screws,
50 photo interrupters,
51 focus motor,
52 Unit indication board,
53 guide shaft,
54 gear,
55 gear,
56 Feed screw 57 Nut,
61 Group lens,
62 Second group lens,
63 Three-group lens,
64 4 group lens,
65 shutter blades,
66 shutter actuator,
70 Rotating slit plate 70,
71 first part,
71a first blade,
71b first fixing part,
71c fitting hole,
71d cutout portion 71e engagement portion,
72 second part,
72a second blade,
72b second fixing part,
72c fitting hole,
72d cutout portion 72e engagement portion,
80 tools.

Claims (2)

Servo motor, rotating slit plate fixed to the shaft of the servo motor and having a plurality of slits formed by gaps between a plurality of blade portions arranged at equal intervals in the circumferential direction, and the rotation rotating together with the shaft A lens barrel having a photo interrupter for detecting passage of the slit of the slit plate,
The rotating slit plate is
A first part having a first fixing part configured to be fixable to the shaft, and one or a plurality of first blade part groups of the plurality of blade parts, and a radially outer side of the shaft. A second fixing portion configured to be able to be fitted to the shaft and fixed to the shaft, a second blade portion group other than the first blade portion group among the plurality of blade portions, and the first An engaging part configured to position the second fixing part around the shaft with respect to the first fixing part by engaging with the one fixing part. Characteristic lens barrel. A drive gear fixed to the shaft;
The lens barrel according to claim 1, wherein the first component is integral with the drive gear in the first fixing portion.

Images