JP6284374B2 - Lens barrel - Google Patents

Description

  The present invention comprises a plurality of frame members, has an electric drive source and a flexible printed circuit board connected to the electric drive source, and some of the frame members advance and retreat in a direction along the optical axis. The present invention relates to a freely configured lens barrel.

  2. Description of the Related Art Conventionally, in a lens barrel used in an imaging apparatus or the like, a focusing operation or focusing is performed by moving a part of a plurality of frame members in a direction along the optical axis of an imaging optical system. Some perform double operation (zooming). In this case, a drive source to which an electric drive source such as an electric motor is applied as a drive source for moving the frame member forward and backward is generally put into practical use.

  In this type of lens barrel, for example, an electric substrate fixed to a fixed frame member in a fixed state among a plurality of frame members, and a moving frame member that moves forward and backward in the optical axis direction with respect to the fixed frame member For example, a flexible printed circuit board, which is a flexible electric circuit board, is generally used as an electrical connection means between the electric drive source or other electrical components provided. In this case, the flexible printed circuit board is formed with a margin in the moving direction of the moving frame member, and is stored in the predetermined space in a folded or curved state so as to be able to absorb the forward and backward movement of the moving frame member. Configured to be

  For example, in the lens barrel disclosed in Japanese Patent Application Laid-Open No. 9-145976 and the like, by providing a plate-shaped guide member for suppressing deformation of the flexible printed circuit board in a small space accompanying the movement of the moving frame member. The storage space for the flexible printed circuit board is secured while effectively using the space in the lens barrel.

  On the other hand, some conventional lens barrels have a moving frame member mounted with a motor or the like as an electric drive source. In the conventional lens barrel having such a configuration, when vibration generated from an electric drive source (motor) or the like is transmitted to the frame member, rattling or the like occurs between the movable frame member and the fixed frame member. There is a possibility that the smooth movement of the moving frame member may be hindered. In addition, there is a possibility that abnormal noise and noise are generated with the occurrence of vibration.

JP-A-9-145976

  However, in the conventional lens barrel disclosed in JP-A-9-145976 and the like, there is a possibility that vibration caused by, for example, an electric drive source (motor) or the like may hinder the forward / backward movement of the moving frame member. There was nothing to consider. Also, abnormal noise and noise caused by vibration and the like have not been considered much in the past.

  The present invention has been made in view of the above-described points, and an object of the present invention is to reduce vibrations and the like caused by an electric drive source (motor) provided on a movable frame member in a lens barrel. Suppressing the occurrence or mitigating the vibration, etc., to ensure smooth movement of the moving frame member and realize high-accuracy operation, while suppressing abnormal noise and noise etc. of operation sound and quietness It is providing the lens barrel which can implement | achieve.

In order to achieve the above object, a lens barrel according to an aspect of the present invention includes an electric drive source, a first frame that is one of a plurality of frame members constituting the lens barrel, and the electric motor. a second frame driving source moves relative to the pair Shi optical axis direction in the first frame is provided, the electric drive source provided between said electric drive source and the first frame and the second A flexible printed circuit board electrically connecting between the frame and the fixed frame, and a fixed part and a pressure contact part, which are formed in a beam shape, have a spring property, guide the flexible printed circuit board in the lens barrel, and is the fixed part is fixed to one of the first frame or the second frame, during the relative movement, always Installing rely on SL contact portion to the second frame or the first frame sliding contact guide Board.

  According to the present invention, in the lens barrel, generation of vibration or the like caused by an electric drive source (motor) or the like provided in the moving frame member is suppressed, or the vibration or the like is suppressed, and the moving frame member It is possible to provide a lens barrel that can ensure a smooth advancement / retraction movement and realize a high-precision operation, and can suppress noise, noise, and the like of the operation sound and realize quietness.

1 is an exploded perspective view showing an exploded lens barrel according to an embodiment of the present invention. 1 is a longitudinal sectional view of a lens barrel according to an embodiment of the present invention in an assembled state. 1 is a cross-sectional perspective view showing a cross-section in a state in which a front half is assembled among components of a lens barrel of an embodiment of the present invention and a state in which a rear half is disassembled. The fragmentary sectional perspective view which shows the cross section of the state assembled except the 4th group lens and the lens side mount ring among the components of the lens barrel of one embodiment of the present invention (when retracted) The fragmentary sectional perspective view which shows the cross section of the state assembled except the 4th group lens and the lens side mount ring among the components of the lens barrel of one embodiment of the present invention (during use) FIG. 2 is an exploded perspective view of a main part showing only the substrate unit in the lens barrel of the embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part showing a part (indicated by reference numeral [7]) of FIG. 3 is an enlarged cross-sectional perspective view of a main part showing a part (indicated by reference numeral [8]) of FIG.

  The present invention will be described below with reference to the illustrated embodiments. One embodiment of the present invention holds, for example, an imaging optical system that includes a plurality of optical lens groups and the like to form a subject image, and a part of the plurality of optical lens groups that constitute the imaging optical system. A lens barrel that includes a drive mechanism that can move a lens group in a direction along the optical axis and that is applied to an imaging device (hereinafter simply referred to as a camera) such as a digital camera or a video camera is illustrated.

  In this embodiment, the optical axis of the photographing optical system in the lens barrel is denoted by reference symbol O. In the direction along the optical axis O, the side with the subject facing the front surface of the camera (not shown) on which the lens barrel is mounted is referred to as the front, and the side with the mount portion of the lens barrel is referred to as the rear. Shall.

  In each drawing used for the following description, each component may be shown with a different scale in order to make each component large enough to be recognized on the drawing. Therefore, according to the present invention, the quantity of components, the shape of the components, the ratio of the sizes of the components, and the relative positional relationship of the components described in these drawings are limited to the illustrated embodiments. is not.

  FIG. 1 is an exploded perspective view showing an exploded lens barrel according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view in a state where the lens barrel of one embodiment of the present invention is assembled. FIG. 3 is a partial cross-sectional perspective view showing a cross-section in the assembled state of the first half of the components of the lens barrel of the embodiment of the present invention, and a disassembled state in the second half.

  FIG. 4 and FIG. 5 are partial cross-sectional perspective views showing a cross section in a state where the fourth group lens and the lens-side mount ring are assembled out of the components of the lens barrel of one embodiment of the present invention. 4 shows a retracted state in which the lens barrel is contracted, and FIG. 5 shows a use state in which the lens barrel is extended. 4 and 5 show the lens barrel as viewed obliquely from the rear, and the illustration of the mount ring and the fourth group lens holding frame in the rear half of the components of the lens barrel is omitted. . FIG. 6 is an essential part exploded perspective view showing only the substrate unit in the lens barrel of the present embodiment. FIG. 7 is an enlarged cross-sectional view of a main part showing an enlarged part (indicated by reference numeral [7]) of FIG. FIG. 8 is an enlarged cross-sectional perspective view of a main part showing a part (indicated by reference numeral [8]) of FIG. 3 in an enlarged manner.

  First, a schematic configuration of the lens barrel 1 of the present embodiment is shown. The lens barrel 1 of the present embodiment is an optical device that is applied to an imaging device such as a camera and has a photographing optical system. As shown in the drawing, the lens barrel 1 includes a plurality of annular or cylindrical components, that is, a guide frame 11, a first group frame holding frame 12, a cam frame 13, and a moving frame 14 (second frame). Frame), fixed frame 15 (first frame), substrate unit 16, lens side mount ring 17, first group lens holding frame 21, and second group lens holding frame 22 (not shown in FIG. 1; FIG. 2). ~ See FIG. 5), the third group lens holding frame 23, the fourth group lens holding frame 24, and the like.

The guide frame 11 is a structural member that guides the first group frame holding frame 12 in a straight line. The entire guide frame 11 is formed in a substantially annular shape or a substantially cylindrical shape. The guide frame 11 has a convex portion 11a that protrudes rearward at the rear edge portion. The convex portion 11 a integrates the guide frame 11 with the moving frame 14 by engaging with a guide frame fixing plate 25 (described later) fixed to the moving frame 14. In addition, the convex part 11a is formed in multiple numbers (three places in this example) at equal intervals along the circumferential direction of the guide frame 11. FIG.
Further, the outer peripheral surface of the convex portion 11a has a convex portion 11c protruding outward in the radial direction, and is slidably engaged in a rectilinear groove 15d parallel to the optical axis provided on the inner peripheral surface of the fixed frame 15 described later. Match. Accordingly, the guide frame 11 can be moved relative to the fixed frame 15 in the optical axis direction and cannot be rotated around the optical axis.

  In addition, a plurality of bottomed rectilinear grooves 11 b extending in a direction parallel to the optical axis O are formed on the inner peripheral surface of the guide frame 11. The plurality of rectilinear grooves 11b are formed in the portions corresponding to the convex portions 11a. That is, the plurality of rectilinear grooves 11b are formed at equal intervals along the inner circumferential direction of the guide frame 11 (three in this example). An outwardly projecting portion (described later) of the protruding portion 12a of the first group frame holding frame 12 is slidably engaged with the rectilinear groove 11b. Accordingly, the guide frame 11 and the first group frame holding frame 12 are relatively restricted from rotating around the optical axis O, and are relatively movable in the optical axis O direction.

  The first group frame holding frame 12 is a constituent member that holds a first group lens holding frame 21 that fixes a later-described first group lens 21 a and moves the first group lens holding frame 21 forward and backward in a direction along the optical axis O. The first group frame holding frame 12 is formed in a substantially annular shape or a substantially cylindrical shape as a whole, and is inserted and arranged in the guide frame 11. A first group lens holding frame 21 is fixed on the inner peripheral side of the front end of the first group frame holding frame 12. The first group lens holding frame 21 is a lens holding member that is formed in a substantially annular shape as a whole. Therefore, an opening is formed in the substantially central portion of the annular shape of the first group lens holding frame 21. A first group lens 21 a among a plurality of optical lenses constituting the imaging optical system of the lens barrel 1 is fixedly held in the opening of the first group lens holding frame 21.

  The first group frame holding frame 12 is formed with a protruding portion 12a that protrudes rearward along the optical axis O at the rear end edge portion. A plurality (three in this example) of the protruding portions 12 a are formed at equal intervals along the circumferential direction of the first group frame holding frame 12. On the outer peripheral surface of each protrusion 12a, an outward convex portion that protrudes outward in the radial direction is formed. As described above, the outwardly projecting portion of the projection 12a is slidably engaged with the rectilinear groove 11b of the guide frame 11. Thus, the first group frame holding frame 12 is guided in a straight line by the guide frame 11 while being restricted in rotation around the optical axis O.

  Further, each projection 12a of the first group frame holding frame 12 has a cam pin that protrudes radially inward on a portion opposite to the portion where the outward convex portion is formed, that is, on the inner peripheral surface side. 12b protrudes. The cam pin 12b is cam-coupled to an outer peripheral cam groove 13b (described later) of the cam frame 13. By this cam coupling, the first group frame holding frame 12 can rotate in the direction along the optical axis O by receiving the rotation of the cam frame 13 around the optical axis O.

  The cam frame 13 is a structural member that moves the first group frame holding frame 12 and the second group lens holding frame 22 forward and backward in the direction along the optical axis O. The cam frame 13 is formed in a substantially annular shape or a substantially cylindrical shape as a whole, and is inserted and arranged in the first group frame holding frame 12. A plurality of (for example, three strips) bottomed outer peripheral cam grooves 13 b are formed on the outer peripheral surface of the cam frame 13. As described above, the cam pin 12b of the first group frame holding frame 12 is cam-coupled to the outer peripheral cam groove 13b. Accordingly, the cam frame 13 rotates around the optical axis O to move the first group frame holding frame 12 forward and backward in the optical axis O direction.

  A plurality of (for example, three strips) bottomed inner circumferential cam grooves 13 a are formed on the inner circumferential surface of the cam frame 13. A 2G cam pin 22d of the second group lens holding frame 22 is cam-coupled to the inner peripheral cam groove 13a. Here, the second group lens holding frame 22 is disposed inside the moving frame 14 as will be described later. The 2G cam pin 22d of the second group lens holding frame 22 projects outwardly through the rectilinear groove 14a of the moving frame 14, and is cam-coupled to the inner peripheral cam groove 13a of the cam frame 13. Thereby, the cam frame 13 moves the second group lens holding frame 22 forward and backward in the direction of the optical axis O.

  An internal gear 13c is formed in a predetermined range along the circumferential direction on the inner peripheral surface of the rear end edge portion of the cam frame 13. The internal gear 13c is engaged with a gear (not shown) of a driving force transmission mechanism for transmitting a driving force from a zoom motor 31 which is one of electric driving sources described later. Accordingly, when the zoom motor 31 is driven, the driving force is transmitted to the internal gear 13c via the driving force transmission mechanism, and the cam frame 13 rotates around the optical axis O.

  Furthermore, a plurality of convex portions 13 d that protrude outward in the radial direction are formed on the outer peripheral surface of the rear edge portion of the cam frame 13. The convex portion 13d is engaged with an inner peripheral cam groove 15d, which will be described later, of the fixed frame 15. Thus, when the cam frame 13 rotates, the convex portion 13 d of the cam frame 13 moves along the inner peripheral cam groove 15 d of the fixed frame 15. Accordingly, at this time, the cam frame 13 moves back and forth in the direction along the optical axis O while rotating around the optical axis O with respect to the fixed frame 15. In addition, the convex part 13d is formed in multiple numbers (three places in this example) at equal intervals along the circumferential direction of the cam frame 13. As shown in FIG.

  The entire moving frame 14 is formed in a substantially annular shape or a substantially cylindrical shape, and is disposed in the cam frame 13. Inside the moving frame 14, a zoom motor 31 and a focus motor (not shown), which are electric driving sources, are fixed. A rectilinear groove 14 a extending in the direction along the optical axis O is formed on the peripheral surface of the moving frame 14. A plurality (three in this example) of rectilinear grooves 14 a are formed at equal intervals along the circumferential direction of the moving frame 14. The rectilinear groove 14 a is formed so as to penetrate the peripheral surface of the moving frame 14. As described above, the 2G cam pin 22d of the second group lens holding frame 22 is slidably engaged with each rectilinear groove 14a.

  A guide frame fixing plate 25 formed in a disc shape is fixed to the rear end edge of the moving frame 14 by a fixing means such as a screw. A plurality (three in this example) of cutout portions 25 a (engagement portions) are formed on the outer peripheral edge portion of the guide frame fixing plate 25. As described above, each protrusion 11a of the guide frame 11 is engaged with each notch portion 25a. Thereby, the moving frame 14 to which the guide frame fixing plate 25 is fixed and the guide frame 11 are integrated.

  As described above, the first group frame holding frame 12 is inserted on the inner peripheral side of the guide frame 11 so as to freely advance and retract in the optical axis direction while being restricted in rotation. A cam frame 13 is rotatably inserted on the inner peripheral side of the first group frame holding frame 12. Here, the cam frame 13 is cam-coupled with the first group frame holding frame 12. Thereby, when the cam frame 13 rotates, the first group frame holding frame 12 moves forward and backward in the optical axis direction. A moving frame 14 is inserted on the inner peripheral side of the cam frame 13. Here, the moving frame 14 and the guide frame 11 are integrated. Thereby, the moving frame 14 can be moved forward and backward in the optical axis direction while being restricted in rotation together with the guide frame 11. The cam frame 13 is rotatable with respect to the moving frame 14.

  In this way, the guide frame 11, the first group frame holding frame 12, the cam frame 13, and the moving frame 14 are assembled. The unit is inserted into the fixed frame 15.

  The fixed frame 15 is a structural member formed entirely in a substantially annular shape or a substantially cylindrical shape. A lens side mount ring 17 is fixed to the rear edge of the fixed frame 15 by a fixing means such as a screw. The lens-side mount ring 17 engages with a camera-side mount portion (not shown) provided on the front surface of a camera body (not shown) to which the lens barrel 1 is applied, so that the lens barrel 1 is attached to the camera body. This is a connecting member for mounting on (not shown). Thus, when the lens barrel 1 is mounted on the camera body, the fixed frame 15 is fixed to the camera body.

  A plurality of inner peripheral cam grooves 15 d are formed on the inner peripheral surface of the fixed frame 15. As described above, each convex portion 13d of the cam frame 13 is engaged with each inner peripheral cam groove 15d. Thereby, when the cam frame 13 is rotated with respect to the fixed frame 15, the cam frame 13 advances and retreats in the direction of the optical axis O while rotating.

  Further, a fixed portion 30a of the guide plate 30 is fixed to a predetermined portion of the rear end surface of the fixed frame 15 by a fixing means such as a screw. The guide plate 30 is a guide member that is provided in order to prevent the flexible printed circuit board 20 provided between the fixed frame 15 and the movable frame 14 from being violated, and holds the flexible printed circuit board 20. The detailed configuration of the guide plate 30 will be described later.

  On the outer peripheral surface of the fixed frame 15, as shown in FIG. 2 (not shown in FIG. 1, FIG. 3, etc.), a plurality of operation members formed in an annular shape, that is, a zoom A ring 33 and a focus ring 34 are rotatably arranged. In addition, an annular exterior member 35 for appearance decoration is fixedly provided on the outer peripheral surface of the fixed frame 15 near the rear end.

  The substrate unit 16 includes a substrate frame 16c that is formed in a substantially annular shape as a whole, and an electric substrate disposed on the outer peripheral side of the substrate frame 16c, for example, a main substrate 16a formed of a hard substrate or a flexible substrate. The flexible printed circuit board 16b is used. Here, the main board 16a and the flexible printed board 16b are formed to have an arc that follows the arc shape of the outer periphery of the board frame 16c, and various electrical components, electrical contact portions, and the like are mounted on the plate surface. . As shown in FIG. 6, the main board 16a and the flexible printed board 16b are fitted in the direction perpendicular to the optical axis O to the outer peripheral surface of the board frame 16c. for that reason. A circumferential groove 16d having a depth in the radial direction and a width slightly larger than the thickness of the main substrate 16a in the optical axis direction is formed on the outer peripheral surface of the substrate frame 16c. A main board 16a and a flexible printed board 16b are fitted and arranged.

  The board unit 16 in a state where the main board 16a, the flexible printed board 16b and the like are attached to the board frame 16c in this way is fixed to the lens side mount ring 17 by a fixing means such as a screw. As a result, the main board 16a and the flexible printed board 16b are reliably maintained in the assembled state without falling off in the radial direction. In order to prevent the main board 16a, the flexible printed board 16b, and the like from falling off, an adhesive may be used to secure the fixed state.

  The lens side mount ring 17 is a connecting component for connecting and fixing the lens barrel 1 to a camera body (not shown). As described above, the lens-side mount ring 17 is fixed to the rear end portion of the fixed frame 15. The lens-side mount ring 17 is provided with an electrical contact portion 17a made of a plurality of metal pieces or the like at a predetermined portion on the rear end face side. The plurality of electrical contact portions 17a are electrically connected to the contacts mounted on the flexible printed board 16b. On the other hand, the plurality of electrical contact portions 17a are disposed at a camera-side mount portion (not shown) when the lens barrel 1 is attached to the camera body via the lens-side mount ring 17. It is in contact with an electrical contact portion (not shown) on the camera body side and serves to ensure an electrical connection between the lens barrel 1 and the camera body (not shown).

  Further, a fourth group lens holding frame 24 is fixed to the lens side mount ring 17 from the rear end side thereof by a fixing means such as a screw.

  The imaging optical system in the lens barrel 1 of the present embodiment includes a plurality of optical lenses, that is, a first group lens 21a, a second group lens 22a, a third group lens 23a, and a fourth group lens 24a. These optical lens groups are arranged along the optical axis O in order from the front of the lens barrel 1. Each optical lens group is held by a first group lens holding frame 21, a second group lens holding frame 22, a third group lens holding frame 23, and a fourth group lens holding frame 24, respectively.

  Among these, the first group lens holding frame 21 that holds the first group lens 21a is held by the first group frame holding frame 12 as described above. Therefore, the first group lens 21a (first group lens holding frame 21) moves forward and backward in the direction along the optical axis O in response to the rotation of the cam frame 13 together with the first group frame holding frame 12.

  As described above, the second group lens holding frame 22 that holds the second group lens 22a is disposed inside the moving frame. Here, the 2G cam pin 22d projecting outward from the outer periphery of the second group lens holding frame 22 passes through the rectilinear groove 14a of the moving frame 14 and cams into the inner peripheral cam groove 13a of the cam frame 13. Are connected. Thus, the second group lens holding frame 22 is held by the cam frame 13 so as to be movable forward and backward in the direction of the optical axis O while being restricted by the moving frame 14. Accordingly, the second group lens 22 a (second group lens holding frame 22) moves forward and backward in the direction along the optical axis O according to the rotation of the cam frame 13. In the lens barrel 1 of the present embodiment, the first lens group 21a and the second lens group 22a advance and retract in the direction of the optical axis O by receiving the driving force of the cam frame 13 that is rotationally driven by the zoom motor 31. It is a lens group constituting a zoom optical system that varies the focal length of the imaging optical system.

  The third group lens holding frame 23 that holds the third group lens 23 a is disposed inside the moving frame 14 in the same manner as the second group lens holding frame 22. Here, the third group lens holding frame 23 is disposed behind the second group lens holding frame 22 on the optical axis O, and can be moved back and forth in the direction of the optical axis O by a focus adjusting mechanism (not shown). . That is, in the lens barrel 1 of the present embodiment, the third group lens 23a is a lens group constituting a focus optical system.

  The fourth group lens holding frame 24 that holds the fourth group lens 24a is fixedly held by the lens side mount ring 17 as described above. Therefore, the fourth group lens 24 a (fourth group lens holding frame 24) is a fixed lens group that is integrally fixed to the fixed frame 15 via the lens side mount ring 17.

  As described above, in the lens barrel 1 of the present embodiment, electrical components such as the zoom motor 31 and the focus motor 32 (see FIGS. 2 and 3), which are electric drive sources, are provided inside the moving frame 14. Is fixed. For example, a flexible printed circuit board 20 or the like is applied to the lens barrel 1 in order to ensure electrical connection such as supplying electric power to these electrical components and the like, transmitting control signals, and the like.

  As shown in FIG. 2 etc., one end of the flexible printed board 20 is connected to the main board 16a and extends from the main board 16a, and the other end side is, for example, a space 14e formed inside the moving frame 14. And are connected to each electric component disposed inside the moving frame 14. That is, the flexible printed circuit board 20 includes a main board 16a fixed to the fixed frame 15 and an electric drive source (zoom motor 31 and focus motor 32) among electric components disposed in the moving frame 14. It is the structural member which electrically connects between. 3 and 8, the flexible printed circuit board 20 is partially broken for illustration.

  In this case, the moving frame 14 moves with respect to the fixed frame 15. For this reason, the flexible printed circuit board 20 is required to have a length with a margin in accordance with the movement of the moving frame 14. For this purpose, the moving frame 14 is provided with the space 14e so as to absorb the shape change of the flexible printed circuit board 20 accompanying the movement in the space 14e. Further, as a guide member for suppressing the movement of the moving flexible printed circuit board 20 and guiding the flexible printed circuit board 20 so that the flexible printed circuit board 20 can always move in the predetermined space 14e, the space between the fixed frame 15 and the moving frame 14 is used. A guide plate 30 is provided.

  The guide plate 30 is formed by bending a metal thin plate member having elasticity (spring property). The guide plate 30 is formed by a fixing portion 30a on one end side, a pressure contact portion 30b on the other end side, and an extending portion 30c between the fixing portion 30a and the pressure contact portion 30b. In the present embodiment, the guide plate 30 is formed in a cantilever shape in which the fixed portion 30a is fixed and the pressure contact portion 30b is a free end.

  Specifically, the fixing portion 30a at one end of the guide plate 30 is fixed to a fixing portion on the rear end surface of the fixing frame 15 by using a fixing means such as a screw. The fixed portion 30 a is a region formed by extending a predetermined distance in the radial direction of the fixed frame 15. An extending portion 30c parallel to the optical axis is formed in a region that is bent from the end of the fixed portion 30a by approximately 90 degrees and extends toward the front of the lens barrel 1 in the direction along the optical axis O. Yes. And the press-contact part 30b is formed in the front end side other end part of this extension part 30c. The pressure contact portion 30b has an arc shape in cross section and is formed so as to protrude toward the outer peripheral side. The extension part 30c and the pressure contact part 30b are disposed in the space 14e of the moving frame 14. The pressure contact portion 30b is in contact with the inner wall surface of the space 14e. As described above, the guide plate 30 has elasticity (spring property), and is formed in a cantilever shape, for example. Therefore, the pressure contact portion 30b formed at the other end of the guide plate 30 is applied in the radial direction to the wall surface (inner peripheral surface) in the space 14e of the moving frame 14. Thus, the guide plate 30 presses the moving frame 14 toward the inner peripheral surface of the cam frame 13 that is externally provided on the outer peripheral side of the moving frame 14. As the guide plate 30, for example, a thin plate member made of stainless steel (SUS) (for example, a plate having a thickness t of about 0.2 mm) is applied.

  In addition, about the form of the guide plate 30, in this embodiment, although it shall be formed in the shape of a cantilever, it is not restricted to this example. Further, the guide plate 30 is configured such that the fixed portion 30a is fixed to the fixed frame 15 (first frame) and the press contact portion 30b is applied to the movable frame 14 (second frame). It is not limited to. For example, the fixing unit 30a may be fixed to the moving frame 14 (second frame), and the pressure contact unit 30b may be applied to the fixed frame 15 (first frame).

The operation of the lens barrel 1 of the present embodiment configured as described above will be briefly described below.
The lens barrel 1 is attached via a lens-side mount ring 17 to a predetermined part (camera side mount part (not shown)) on the front surface of a camera body (not shown) to which the lens barrel 1 is applied. It is assumed that it is in the state. At this time, the lens barrel 1 and the camera body (not shown) are electrically connected at the mount site.

  As described above, when the lens barrel 1 of the present embodiment is connected to the camera body to which the lens barrel 1 is applied, the lens barrel 1 is shown in FIG. As shown, it is assumed that each frame member is in a so-called collapsed state in which the entire frame members are overlapped in the radial direction and the whole is contracted. In this state, for example, when a power source is turned on by operating an operation member (not shown) on the camera body side, a control unit (not shown) provided inside the camera body side is, for example, on the lens barrel 1 side. In cooperation with the lens side control unit mounted on the main board 16a, the zoom motor 31 as an electric drive source is driven and controlled. Thereby, when the zoom motor 31 is rotationally driven, the driving force is transmitted to the internal gear 13c of the cam frame 13 via the driving force transmission (not shown), and the cam frame 13 is rotated around the optical axis O. Then, the cam frame 13 is fed forward in the direction along the optical axis O while rotating with respect to the fixed frame 15. At the same time, the cam frame 13 moves the second group lens holding frame 22 forward and backward in a predetermined direction in the direction along the optical axis O via the inner peripheral cam groove 13a and the 2G cam pin 22d. At the same time, the cam frame 13 extends the first group frame holding frame 12 forward in the direction along the optical axis O via the outer peripheral cam groove 13b and the cam pin 12b. At this time, the moving frame 14 and the guide frame 11 are integrally fed forward.

  In this case, the guide plate 30 is provided between the fixed frame 15 and the moving frame 14, and the flexible printed circuit board 20 extending from the main board 16 a of the board unit 16 to the inside of the moving frame 14 is prevented. The guide is held down. At the same time, the guide plate 30 always presses the moving frame 14 toward the outer peripheral side by its own elasticity. With this configuration, vibration generated by driving an electric drive source (zoom motor 31, focus motor 32, etc.) fixed inside the moving frame 14 is transmitted from the moving frame 14 to other components. It is relaxed. Also, abnormal noise, noise, etc. generated due to the vibration are suppressed.

  As described above, according to the above-described embodiment, in the lens barrel 1 configured by mounting the electric drive source (the zoom motor 31 and the focus motor 32) on the moving frame 14, the fixed portion (the fixed frame 15) and The flexible printed circuit board 20 disposed between the moving member (moving frame 14) is elastic (spring property) to guide the guide plate 30 provided to suppress the ramping with the movement of the moving frame 14 and guide it. ). The guide plate 30 is arranged so that the fixed portion 30 a at one end is fixed to the fixed frame 15 and the press contact portion 30 b at the other end is pressed against the moving frame 14.

  By adopting such a configuration, the vibration generated when the electric drive source (the zoom motor 31 and the focus motor 32) mounted on the moving frame 14 is driven is mitigated, and the vibration is transmitted to other components. Can be suppressed. In addition, it is possible to suppress abnormal noise, noise, and the like that are caused by the driving.

  In the above-described embodiment, the lens barrel to which the present invention is applied is exemplified as a lens barrel configured to be detachable from the camera body. However, the present invention is not limited to this configuration. For example, the configuration of the present invention can also be applied to a camera in which a camera body and a lens barrel are integrally formed.

  The present invention is not limited to the above-described embodiments, and it is needless to say that various modifications and applications can be implemented without departing from the spirit of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the above-described embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, this constituent requirement is deleted. The configured structure can be extracted as an invention.

  The present invention is not limited to only a lens barrel that is applied to an imaging device (camera) that is an electronic device specialized for a shooting function such as a digital camera, and other forms of electronic devices having a shooting function, For example, it is widely used in various electronic devices with photographing functions such as mobile phones, smartphones, recording devices, electronic notebooks, personal computers, tablet terminal devices, game devices, mobile TVs, watches, navigation devices using GPS (Global Positioning System). Can be applied.

  Furthermore, the same applies to an electronic device having a function of acquiring an image using an image sensor and displaying the acquired image on a display device, for example, a lens barrel applied to an observation device such as a telescope, binoculars, and a microscope. Can be applied to.

1 ... Lens barrel,
11 ... guide frame, 11a ... convex portion, 11b ... straight groove, 11c ... convex portion,
12 …… Group 1 frame holding frame, 12a …… Protruding part, 12b …… Cam pin,
13... Cam frame, 13 a. Inner peripheral cam groove, 13 b. Outer peripheral cam groove, 13 c... Internal gear, 13 d.
14 …… moving frame, 14a …… straight groove, 14e …… space,
15 ... fixed frame, 15d ... inner circumferential cam groove, 15e ... straight groove,
16 ... Board unit, 16a ... Main board, 16b ... Flexible printed circuit board, 16c ... Board frame,
17 …… Lens side mount ring, 17a …… Electric contact point,
20 …… Flexible printed circuit board,
21 …… 1 group lens holding frame, 21a …… 1 group lens,
22 …… 2 group lens holding frame, 22a …… 2 group lens, 22d …… 2G cam pin,
23 …… 3 group lens holding frame, 23a …… 3 group lens,
24 …… 4 group lens holding frame, 24a …… 4 group lens,
25 …… Guide frame fixing plate, 25a …… Notched portion,
30 …… Guide plate, 30a …… Fixed part, 30b …… Press-contact part, 30c …… Extension part,
31 …… Zoom motor,
32 …… Focus motor,
33 …… Zoom ring,
34 …… Focus ring,
35 …… Annular exterior member,

Claims (4)

In the lens barrel,
An electric drive source;
A first frame that is one of a plurality of frame members constituting the lens barrel;
A second frame for relative movement to-Shi in the optical axis direction in the first frame the electric drive source is provided,
A flexible printed circuit board provided between the electric drive source and the first frame, and electrically connecting the electric drive source and the first frame;
It has a fixed part and a pressure contact part, is formed in a beam shape, has a spring property, guides the flexible printed circuit board in the lens barrel, and is placed on one of the first frame and the second frame. fixing part is fixed, and the relative moving constantly Installing rely on SL contact portion to the second frame or the first frame sliding contact guide plate,
A lens barrel characterized by comprising:   2. The lens barrel according to claim 1, wherein the guide plate extends in the optical axis direction and is provided in a cantilever shape.   The lens barrel according to claim 1, wherein the electric drive source is a motor that drives a focusing lens.   The lens barrel according to claim 1, wherein the electric drive source is a motor that drives a zoom lens.

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