JP2016114799A - Zoom lens barrel and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens barrel that is excellent in an anti-impact absorption property, as attaining miniaturization of a lens frame, and to provide an imaging device that uses the zoom lens barrel.SOLUTION: When viewing a zoom lens barrel 100 in an optical axis direction, a 3B cam follower 108m is arranged on an opposite side across an optical axis OA with respect to a 3A cam follower 108a, and thus, a third holder 105 is downsized to enable increase in an interval between the cam followers. Accordingly, when impact force owing to a falling and the like is given to the zoom lens barrel 100, the 3B cam follower 108m comes into contact with a 3B cam groove 103e upon receiving moment arising from inertia force occurring in the third holder 105, and a moment load can be received with a large span between the 3B cam follower 108m and the 3A cam follower 108a, which in turn stress acting between the cam follower and the cam groove can be held down to a low level, and an anti-impact absorption property can be improved.SELECTED DRAWING: Figure 3

Description

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

  In a conventional zoom lens barrel, a cam groove provided in a lens frame that holds a lens group is engaged with a cam groove formed in the cylindrical member, and the lens member is rotated along with the optical axis by rotating the cylindrical member. There are some which are moved in the direction to realize the zoom function. By the way, when a zoom lens barrel having such a configuration is assembled in an imaging device such as a digital camera, or when it is alone and accidentally dropped or hit a desk, a relatively heavy lens group is formed. Each lens frame moves with inertia, which may cause the cam pin to bite into the cam groove or fall off the cam groove.

  In order to eliminate such problems, in the lens barrel shown in Patent Document 1, two types of cam groove portions are provided in the drive cam ring, and the first and second lens frames (lens barrels) that hold the lens group are provided with first and second cam groove portions. The second cam pins are associated with each other. One of the two types of cam groove portions is a drive cam groove portion that is fitted with no gap to the drive cam pin, and has a function of moving the lens barrel in the optical axis direction. On the other hand, the other cam groove portion is a shock-resistant cam groove portion that has a gap with respect to the impact-absorbing cam pin. When an impact force is applied to the lens barrel, both come into contact with each other. This prevents the drive cam pin from falling off from the drive cam groove and the drive cam pin from biting into the drive cam groove.

JP 2011-242683 A

  By the way, in the lens barrel shown in Patent Document 1, the first and second cam pins are arranged close to each other along the optical axis direction. Here, when an impact force is applied to the lens barrel by dropping or the like, the inertial force generated in the lens frame can be generally decomposed into an optical axis direction component and a direction component intersecting the optical axis direction. However, the inertial force of the direction component intersecting the optical axis direction generates a moment centering on the driving cam pin provided on the lens frame. When this moment is received by the shock absorbing cam pin, Since the arrangement span with the cam pin 2 is short, an excessive stress may act on the shock absorbing cam pin and cause damage to the cam groove. On the other hand, if the arrangement span of the first cam pin and the second cam pin is widened, a large moment can be resisted, but there is a problem that the lens frame is enlarged accordingly.

  An object of the present invention is to solve the above-described problems, and to provide a zoom lens barrel excellent in impact resistance while reducing the size of a lens frame, and an imaging device using the same. With the goal.

The zoom lens barrel according to claim 1 is a zoom lens barrel that moves any one or more of a plurality of lens groups in the optical axis direction.
A rotatable cylindrical member formed with a first cam groove and a second cam groove;
A lens frame that holds the lens group and is movable in the optical axis direction with respect to the cylindrical member;
A guide member for guiding the lens frame in the optical axis direction,
The lens frame includes a first cam pin that comes into contact with and engages with the first cam groove, and a second cam pin that moves along the second cam groove. Is provided,
The lens frame is urged in the optical axis direction by sliding the first cam pin with respect to the first cam groove according to the rotation of the cylindrical member,
When an impact force is applied to the zoom lens barrel, the second pin comes into contact with the second cam groove and receives a force;
When the zoom lens barrel is viewed in the optical axis direction, the second cam pin is disposed on the opposite side of the first cam pin across the optical axis,
The guide member is a main guide shaft and a sub guide shaft that engage with the lens frame so as to be relatively movable and extend along the optical axis direction.

  According to the present invention, when the zoom lens barrel is viewed in the optical axis direction, the second cam pin is disposed on the opposite side of the first cam pin across the optical axis. The cam frame can have a large arrangement span while reducing the size of the lens frame, so that an impact force is applied to the lens barrel by dropping or the like, resulting in an excessive force caused by the inertial force generated in the lens frame. When receiving a moment, the stress acting between the cam pin and the cam groove can be kept low by receiving a moment load with a large span, thereby improving impact resistance. . Further, since the second cam pin is arranged in the circumferential direction away from the first cam pin, it is necessary to extend the lens frame in the optical axis direction in order to ensure a large span of the cam pin. Contributes to downsizing. Further, since the guide member is a main guide shaft and a sub guide shaft that are movably engaged with the lens frame and extend along the optical axis direction, the lens frame can be smoothly moved in the optical axis direction. Can be moved. Note that “arranged on the opposite side across the optical axis” means that the second frame is divided into two when the lens frame is bisected with an orthogonal plane perpendicular to a perpendicular line extending from the center of the first cam pin to the optical axis. The cam pins are arranged on different sides with respect to the first cam pin across the boundary. However, an angle formed between a perpendicular line extending from the center of the first cam pin to the optical axis and a perpendicular line extending from the center of the second cam pin to the optical axis is 120 ° to 180 ° when viewed from the optical axis direction. More preferably, it is in the range.

  An imaging apparatus according to a second aspect includes the zoom lens barrel according to the first aspect.

  According to the present invention, it is possible to provide a zoom lens barrel excellent in shock resistance absorption and an imaging apparatus using the same while reducing the size of the lens frame.

1 is an external view of a digital camera that is an example of an imaging apparatus including a zoom lens barrel according to an embodiment of the present invention. 1 is a perspective view of a zoom lens barrel 100 according to the present embodiment. 1 is a sectional view in the optical axis direction of a zoom lens barrel 100 according to the present embodiment. It is a perspective view of the 3rd holder (lens frame) 108. FIG. 5 is a cross-sectional view of the configuration of FIG. 3 taken along the line VV and viewed in the direction of the arrow. FIG. 6 is a cross-sectional view of a part of the zoom lens barrel of FIG. 5 taken along the line VI-VI and viewed in the direction of the arrow. FIG. 4 is a cross-sectional view of a part of the zoom lens barrel 100 viewed from another direction. FIG. 4 is a cam diagram of a 3A cam groove 103e, a 3B cam groove 103f, and a 3C cam groove 103g, showing a state where an inner peripheral surface of the cam cylinder 103 is developed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a digital camera that is an example of an imaging apparatus including a zoom lens barrel according to the present embodiment. FIG. 1A is a front view of the digital camera 1, and FIG. 1B is a rear view.

  As shown in FIG. 1, the digital camera 1 includes an imaging unit 2 having a zoom lens barrel and an imaging device, and a camera body unit 3.

  The imaging unit 2 includes a zoom lens barrel capable of zooming and a solid-state imaging element such as a CCD, and can convert a subject image formed through the zoom lens barrel into an image signal by the solid-state imaging element.

  The camera body unit 3 includes an LCD display unit 6 including an LCD (Liquid Crystal Display), an EVF (Electronic View Finder) 7, and external connection terminals for connecting the digital camera 1 to a personal computer (not shown). The image signal captured by the imaging unit 2 is subjected to predetermined signal processing, image display on the LCD display unit 6 and EVF 7, image recording on a recording medium such as a memory card (not shown), or a personal computer Processing such as transferring an image to.

  On the front surface of the camera body 3, a flash light emitting unit 4 is provided at an appropriate upper position. Further, an LCD display unit 6 and an EVF 7 are provided on the back side of the camera body unit 3 for displaying captured images and reproducing and displaying recorded images.

  On the upper surface of the camera body 3, there are provided a shutter button 5 and a shooting mode changeover switch (not shown) that switches between “recording mode” and “reproduction mode” near the shutter button 5. The recording mode is a mode for taking a picture from the shooting standby state through the exposure control process, and the playback mode is a mode for reproducing and displaying the shot image recorded on the memory card on the LCD display unit 6 and the EVF 7. is there.

  On the back surface of the camera body 3, a playback frame advance switch / zoom switch 9 is provided for frame playback of playback images and zoom operations during shooting. The frame advance of the playback image by the playback frame advance switch / zoom switch 9 is a mode in which the camera is set to the playback mode and the images recorded on the memory card 13 are sequentially displayed on the LCD display unit 6 together with the frame number. . Note that it is possible to instruct to change the image display on the LCD display unit 6 in the ascending order direction (direction of photographing order) or the descending order direction (direction opposite to the photographing order). Further, the zoom operation at the time of shooting is performed by operating the playback frame advance switch / zoom switch 9 to change the magnification of the imaging optical system, which is a zoom lens, in the tele direction or the wide direction.

  Further, an EVF changeover switch 8 for selecting an LCD display unit 6 and an EVF 7 for displaying an image is provided on the back surface of the camera body unit 3.

  In addition, a battery (not shown) as a power source for operating the digital camera 1 is provided inside the bottom surface of the camera body 3.

  FIG. 2 is a perspective view of a zoom lens barrel (also referred to as a lens barrel) 100 according to the present embodiment. FIG. 3 is a cross-sectional view in the optical axis direction of the zoom lens barrel 100 according to the present embodiment. The zoom lens barrel 100 according to the present embodiment will be described using a zoom lens having a five-group configuration as an example. The zoom lens barrel 100 includes, in order from the object side, a first lens group G1 including lenses L1, L2, and L3, a second lens group G2 including lenses L4, L5, L6, and L7, and a variable aperture blade BR. The shutter unit SH includes a third lens group G3 including a fixed lens L8, L9, and L10 and adjustment lenses L11 and L12, a fourth lens group G4 including a lens L13, and a fifth lens group G5 including a lens L14. ing. In the present embodiment, the fifth lens group G5 is fixed, and the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 change the distance between the groups. However, zooming is performed by moving in the direction of the optical axis OA. The fourth lens group G4 is independently moved in the direction of the optical axis OA to perform focusing. The shutter device SH, which is a part of the third lens group G3, can form a diaphragm having an arbitrary aperture diameter by driving the variable diaphragm blade BR.

  Referring to FIG. 3, the ground plane 101 fixed to the camera main body 3 forms a cylindrical portion 101 a at the center, and holds the fifth lens group G <b> 5 on the inner periphery thereof. The subject light that has passed through the lens groups G <b> 1 to G <b> 5 and passed through the cylindrical portion 101 a is imaged on the imaging surface of a solid-state imaging device attached to the camera body 3.

  The end of the fixed cylinder 102 is coaxially fixed to the object side of the main plate 101. A cam cylinder 103 is rotatably mounted around the fixed cylinder 102, and a corresponding protrusion 102 a formed on the fixed cylinder 102 is associated with a circumferential groove 103 a formed near the object side end. As a result, the cam cylinder 103 is restricted from moving in the optical axis direction with respect to the fixed cylinder 102 and can only rotate. A gear 103b is formed on the outer periphery of the image side end of the cam cylinder 103, and a motor pinion (not shown) is engaged therewith.

  A pin (not shown in the cross section of FIG. 3) is formed on the outer periphery of the fixed cylinder 102 on the object side end so as to protrude outward in the radial direction. On the other hand, a rectilinear groove (not shown in the cross section of FIG. 3) is formed on the inner periphery of the rectilinear cylinder 104 arranged around the cam cylinder 103 so as to extend in the direction of the optical axis OA. A pin protruding from the outer periphery of the cylinder 102 is engaged. Therefore, the rectilinear cylinder 104 is restricted in rotation by the fixed cylinder 102 and can move only in the optical axis direction. A donut plate-shaped light shielding plate 106 is fixed to the object side end of the straight cylinder 104.

  A first cam groove 103 c is formed on the outer periphery of the cam cylinder 103, and a first cam follower 104 b provided on the inner periphery in the vicinity of the image side end of the rectilinear cylinder 104 is engaged therewith. In addition, 2A cam grooves 103d and 2B cam grooves 103h are formed on the inner periphery of the cam cylinder 103. Corresponding to these, 2A cam followers 107a and 2A cam followers 107a are provided on the outer periphery of the second holder 107 holding the second lens group G2. A 2B cam follower 107d is provided.

  The inner end of the second cam follower 107a is inserted into a hole 107b formed in the second holder 107, and is biased so as to be pushed radially outward by a spring member 107c disposed in the hole 107b. ing. On the other hand, the 2B cam follower 107d is fixedly disposed in a hole 107e formed in the second holder 107 so as to be separated from the hole 107b in the optical axis direction. The 2A cam follower 107a is engaged with the 2A cam groove 103d, but the 2B cam follower 107d enters the 2B cam groove 103h with a gap therebetween. The fourth lens group G4 is held by a fourth holder 109. Note that the second holder 107 and the fourth holder 109 are restricted in rotation by a guide shaft (not shown in FIG. 3) and are movable in the direction of the optical axis. The third holder 108 will be described below.

  FIG. 4 is a perspective view of the third holder (lens frame) 108. FIG. 5 is a cross-sectional view of the configuration of FIG. 3 taken along the line V-V and viewed in the direction of the arrow. 6 is a cross-sectional view of a part of the zoom lens barrel of FIG. 5 taken along the line VI-VI and viewed in the direction of the arrow. FIG. 7 is a cross-sectional view seen from another direction. FIG. 8 is a cam diagram of the 3A cam groove 103e, the 3B cam groove 103f, and the 3C cam groove 103g, which is shown together with the 2A cam groove 103d and the 2B cam groove 103h.

  2 and 8, a 3A cam groove 103e and a 3B cam groove 103f are formed in parallel on the inner periphery of the cam cylinder 103, and a 3C cam groove 103g is formed at a position away from them. Further, the 2A cam groove 103d and the 2B cam groove 103h are formed in parallel. The third holder 108 surrounded by the cam cylinder 103 holds the fixed lenses L8, L9, and L10 of the third lens group G3. As shown in FIG. 4, a 3A cam follower (first cam pin) 108a, a 3B cam follower (second cam pin) 108m, and a 3C cam follower (third cam pin) 108n provided on the outer periphery of the third holder 108 are optical axes. It is formed in the orthogonal direction.

  As shown in FIGS. 3 and 5, the 3A cam follower 108 a has an inner end inserted into a hole 108 b formed in the third holder 108, and a 3 A cam follower is formed by a spring member 108 h disposed in the hole 108 b. 108a is urged to be pushed outward in the radial direction. The tapered tip of the 3A cam follower 108a passes through a slit 102c formed in the peripheral wall of the fixed cylinder 102 in the optical axis direction and engages with the 3A cam groove (first cam groove) 103e so as to be slidable without any gap. doing.

  Further, in the cross section shown in FIG. 5, the 3B cam follower 108 m is inserted and fixed in a hole 108 p formed in the third holder 108 at its inner end. The tapered tip of the 3B cam follower 108m passes through a slit 102c formed in the peripheral wall of the fixed cylinder 102 in the optical axis direction and enters the 3B cam groove (second cam groove) 103f. There is no contact and there is a gap between them. However, the 3B cam follower 108m and the 3B cam groove 103f may come into contact with each other as long as the zoom operation is not hindered.

  The 3B cam follower 108m is opposite to the 3A cam follower 108a with respect to a plane VP (extending in the direction perpendicular to the paper in FIG. 5) perpendicular to the perpendicular line N1 extending from the center of the 3A cam follower 108a to the optical axis OA and passing through the optical axis OA. Arranged on the side. More specifically, in the cross section shown in FIG. 5, an angle θ formed by a perpendicular line N1 dropped from the center of the 3A cam follower 108a to the optical axis OA and a perpendicular line N2 dropped from the center of the 3B cam follower 108m to the optical axis OA is It is preferable that it is 120 to 180 degrees. Although the 3A cam follower 108a and the 3B cam follower 108m are shifted in the optical axis direction, they may be provided at the same position in the optical axis direction.

  As shown in FIGS. 3 and 5, the 3C cam follower 108 n is disposed adjacent to the 3 A cam follower 108 a in the optical axis direction, and an inner end thereof is inserted into a hole 108 q formed in the third holder 108. The tapered tip of the 3C cam follower 108n passes through the slit 102c formed in the peripheral wall of the fixed cylinder 102 in the optical axis direction and enters the 3C cam groove (third cam groove) 103g. There is no contact and there is a gap between them. However, the 3C cam follower 108n and the 3C cam groove 103g may be in contact with each other as long as the zoom operation is not hindered.

  The third holder 108 as a fixed frame is integrally formed from a cylindrical portion 108d that holds the fixed lenses L8, L9, and L10 and a flange portion 108f that extends in the radial direction from the cylindrical portion 108d. Magnets MG1 and MG2 (see FIG. 5) are fixedly disposed on the image side surface (the surface facing the fifth holder 118) of the flange portion 108f.

  Referring to FIG. 5, coils CL1 and CL2 are provided on the object side surface of the fifth holder 118 as a movable frame (the surface facing the third holder 108) so as to face the magnets MG1 and MG2, respectively. Yes. Hall elements HE1 and HE2 are arranged at the centers of the coils CL1 and CL2, respectively. Coils CL1 and CL2 and Hall elements HE1 and HE2 are connected to the wiring portion of flexible printed circuit board 115. The magnet MG1, MG2, coils CL1, CL2, and flexible printed circuit board 115 constitute a drive mechanism. The drive mechanism, the fixed lenses L8, L9, and L10, the third holder 108 that holds them, the adjustment lenses L11 and L12, and the fifth holder 118 that holds them constitute a shake correction unit.

  In FIG. 5, MGS2 is a main guide shaft that is slidably fitted and guided to the second holder 107, and SGS2 is disposed on the opposite side of the main guide shaft MGS2 with the optical axis OA interposed therebetween. The sub guide shaft is slidably fitted to the second holder 107 to restrict rotation. Further, MGS3 is a main guide shaft that is slidably fitted and guided to the third holder 108, and MGS4 is a main guide shaft that is slidably fitted and guided to the fourth holder 109. The SGS3 is disposed on the opposite side of the main guide shafts MGS3 and MGS4 with the optical axis OA interposed therebetween, and is slidably fitted to the third holder 108 and the fourth holder 109 so as to restrict rotation in common. It is. The main guide shafts MGS3 and MGS4 are preferably arranged on the side close to the motor 111. The main guide shaft MGS3 and the sub guide shaft MGS2 constitute a guide member.

  In FIG. 6, three circular recesses 108 g are formed on the image side surface of the third holder 108 so as to sandwich the magnets MG <b> 1 and MG <b> 2, and the balls BL that are rolling elements are arranged so as to be able to roll. ing. The ball is preferably spherical, and the material is preferably ceramic or SUS that is not attracted to the magnet.

  In the assembled state as shown in FIG. 6, the ball BL comes into contact with the object side surface of the fifth holder 118. Both ends of a coil spring CS as an urging member are attached to the three arms 108 c protruding from the outer periphery of the third holder 108 and the three arms 118 a protruding from the outer periphery of the fifth holder 118. The third holder 108 and the fifth holder 118 are urged in directions close to each other by the urging force of the spring CS.

  As described above, the third holder 108 is configured to roll between the third holder 108 and the fifth holder 118 that are urged to each other by the coil spring CS. 118 can be moved smoothly and stably in the direction orthogonal to the optical axis while the relative position in the optical axis direction is fixed. In addition, when viewed in the optical axis direction, the three balls BL are arranged almost at the apex of a right-angled isosceles triangle (however, the apex angle is not limited to 90 ° but may be in the range of 70 ° to 110 °). Since magnets MG1 and MG2 and coils CL1 and CL2 (FIG. 5) are arranged at positions overlapping with the equal sides of the right isosceles triangle, respectively, the apex angle of the right isosceles triangle and the optical axis OA A part of the third holder 108 and the fifth holder 118 on the opposite side can be cut, so that parts such as the main guide shafts MGS3, MGS4, the motor 111, and the 3A cam follower 108a can be arranged in an empty space. The lens barrel 100 can be further downsized.

  The operation of the shake correction unit according to the present embodiment will be described with reference to FIG. If the acceleration sensor (not shown) determines that the digital camera 1 has swung in the X direction, the coil CL1 is energized through the flexible printed circuit board 115, and Lorentz force is generated in the magnetic field formed by the magnet MG1. As a result, the fifth holder 118 moves in the X direction with respect to the third holder 108, whereby the adjustment lenses L11 and L12 move in the X direction to correct image blur. The amount of movement of the adjustment lenses L11 and L12 in the X direction is detected by the hall element HE1.

  Similarly, if the acceleration sensor (not shown) determines that the digital camera 1 has swung in the Y direction, the coil CL2 is energized, thereby generating a Lorentz force in the magnetic field formed by the magnet MG2. As a result, the fifth holder 118 moves in the Y direction with respect to the third holder 108, whereby the adjustment lenses L11 and L12 move in the Y direction to correct image blur. The amount of movement of the adjustment lenses L11 and L12 in the Y direction is detected by the hall element HE2.

  The zoom operation and focusing operation of this embodiment will be described. When the cam cylinder 103 rotates by driving a motor (not shown), the first cam follower 104b slides along the first cam groove 103c, and the linear movement cylinder 104 moves in the optical axis direction by the pressing force received at that time. It is supposed to be. When the cam cylinder 103 rotates, the 2A cam follower 107a slides along the second cam groove 103d, and the second holder 107 moves in the optical axis direction by the pressing force received at that time. However, the 2B cam follower 107d moves along the cam groove without contacting the 2B cam groove 103h.

  Further, when the cam cylinder 103 rotates, the 3A cam follower 108a slides along the 3A cam groove 103e, and the third holder 108 moves in the optical axis direction by the pressing force received at that time. However, the 3B cam follower 108m and the 3C cam follower 108n move along the cam grooves without contacting the 3B cam groove 103f and the 3C cam groove 103g, respectively. Since the shutter device SH and the fifth holder 118 holding the adjustment lenses L11 and L12 are connected to the third holder 108, they move integrally in the optical axis direction.

  In FIG. 7, a screw shaft 112 is connected to a rotation shaft of a motor 111 attached to the fixed cylinder 102 via an attachment member 110. The other end of the screw shaft 112 is rotatably supported by a bearing 113 provided on the attachment member 110. A nut member 114 is screwed onto the screw shaft 112. The nut member 114 is connected to a fourth holder 109 that holds the fourth lens group G4. By supplying power to the motor 111, the screw shaft 112 rotates, and the nut member 114 moves in the optical axis direction according to the rotation angle, so that the fourth holder 109 together with the fourth lens group G4 moves in the optical axis direction. It moves to perform zoom movement or focusing.

  According to the present embodiment, when the zoom lens barrel 100 is viewed in the optical axis direction, the 3B cam follower 108m is disposed on the opposite side of the 3A cam follower 108a with the optical axis OA interposed therebetween. While the size of the third holder 108 can be reduced, the distance between the cam followers can be increased, so that when an impact force is applied to the zoom lens barrel 100 due to dropping or the like, the inertia force generated in the third holder 108 is reduced. When receiving the resulting moment, the 3B cam follower 108m contacts the 3B cam groove 103e and receives a moment load with a large span between the 3B cam follower 108m and the 3A cam follower 108a, thereby acting between the cam follower and the cam groove. Stress can be kept low, and impact resistance can be improved.

  Furthermore, according to the present embodiment, since the 3C cam follower 108n is disposed along the optical axis direction with respect to the 3A cam follower 108a, an impact force in the optical axis direction is applied to the zoom lens barrel 100 by dropping or the like. When this is done, the 3C cam follower 108n comes into contact with the 3C cam groove 103g, whereby the stress acting between the cam follower and the cam groove can be kept low, and the impact resistance can be improved.

  The present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are apparent to those skilled in the art from the embodiments and ideas described in the present specification. It is. The description and examples are for illustrative purposes only, and the scope of the invention is indicated by the following claims. For example, 3A cam followers 108a, 3B cam followers 108m, and 3C cam followers 108n may be arranged at equal intervals in the circumferential direction at intervals of 120 degrees. As described above, by arranging the 3A cam follower 108a, the 3B cam follower 108m, and the 3C cam follower 108n at equal intervals in the circumferential direction, the impact force can be further dispersed when an impact force is applied to the zoom lens barrel. However, even when only the 3A cam follower 108a and the 3B cam follower 108m are provided, or when the 3C cam follower 108n is provided, the cam grooves facing these may interfere with other cam grooves unless they are provided at equal intervals in the circumferential direction. Since it is reduced, the design becomes easier. The third lens group G3 may be fixed in the optical axis direction at the time of zooming. In the above-described embodiment, the zoom lens having the five-group configuration has been described. However, the zoom lens is not limited to the five-group configuration, and may be a four-group configuration, for example.

DESCRIPTION OF SYMBOLS 1 Digital camera 2 Image pick-up part 3 Camera body part 4 Flash light emission part 5 Shutter button 6 Display part 7 EVF
8 Switch 9 Zoom switch 13 Memory card 100 Zoom lens barrel 101 Base plate 101a Cylindrical portion 102 Fixed cylinder 102a Projection 102c Slit 103 Cam cylinder 103a Circumferential groove 103b Gear 103c First cam groove 103d 2A cam groove 103h 2B cam groove 103e 3A Cam groove 103f 3B cam groove 103g 3C cam groove 104 Linear cylinder 104b First cam follower 105 First holder 106 Light shielding plate 107 Second holder 107a 2A cam follower 107b Hole 107c Spring member 107d 2B cam follower 107e Hole 108 Third holder 108a 3A cam follower 108b Hole 108c Arm 108d Cylindrical portion 108f Flange portion 108g Circular recess 108h Spring member 108m 3B cam follower 108n 3C cam follower 108p Hole 108q Hole 1 09 Fourth holder 110 Mounting member 111 Motor 112 Screw shaft 113 Bearing 114 Nut member 115 Flexible printed circuit board 118 Fifth holder 118a Arm BL Ball BR Blade CL1, CL2 Coil CS Coil spring G1-G5 Lens group HE1, HE2 Hall element L1- L14 Lens MG1, MG2 Magnet MGS2, MGS3, MGS4 Main guide shaft OA Optical axis SH Shutter device

Claims (2)

A zoom lens barrel that moves one or more of a plurality of lens groups in the optical axis direction,
A rotatable cylindrical member formed with a first cam groove and a second cam groove;
A lens frame that holds the lens group and is movable in the optical axis direction with respect to the cylindrical member;
A guide member for guiding the lens frame in the optical axis direction,
The lens frame includes a first cam pin that comes into contact with and engages with the first cam groove, and a second cam pin that moves along the second cam groove. Is provided,
The lens frame is urged in the optical axis direction by sliding the first cam pin with respect to the first cam groove according to the rotation of the cylindrical member,
When an impact force is applied to the zoom lens barrel, the second pin comes into contact with the second cam groove and receives a force;
When the zoom lens barrel is viewed in the optical axis direction, the second cam pin is disposed on the opposite side of the first cam pin across the optical axis,
The zoom lens barrel according to claim 1, wherein the guide member includes a main guide shaft and a sub guide shaft that are engaged with the lens frame so as to be relatively movable and extend along an optical axis direction.   An imaging apparatus comprising the zoom lens barrel according to claim 1.

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