JP2019113878A - Lens barrel - Google Patents

Abstract

To provide a lens barrel which is improved in lens holding accuracy.SOLUTION: A lens barrel comprises: a first frame body formed in approximately cylinder shape; a first lens group having at least one lens, which is movable in an optical axis direction; a second lens group having at least one lens, which is movable in the optical axis direction; a second frame body for holding the first lens group; and a third frame body for holding the second lens group. The first lens group and the second lens group are disposed in order from a subject side to an image surface side. Outer peripheral surfaces of the second frame body and the first frame body are engaged by a first cam mechanism, and outer peripheral surfaces of the third frame body and the first frame body are engaged by a second cam mechanism. When the first body rotates around an optical axis, the second frame body and the third frame body move in the optical axis direction with respect to the first frame body.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a lens barrel provided with an optical system.

  Patent Document 1 discloses an optical apparatus that can improve a backlash mechanism of a cam pin in a cam mechanism of a lens barrel, and can thereby miniaturize the optical apparatus.

Japanese Patent Application Laid-Open No. 11-109209

  The present disclosure provides a lens barrel with high lens holding accuracy.

The lens barrel in the present disclosure has a first frame formed in a substantially cylindrical shape and at least one lens, and is movable in the optical axis direction, and at least one lens. And a second frame that can move in the optical axis direction, a second frame that holds the first lens group, and a third frame that holds the second lens group. The first lens unit and the second lens unit are disposed in order from the subject side to the image plane side.
The second frame and the outer circumferential surface of the first frame are engaged by the first cam mechanism, and the third frame and the outer circumferential surface of the first frame are engaged by the second cam mechanism . Then, when the first frame rotates around the optical axis, the second frame and the third frame move in the optical axis direction with respect to the first frame.

  According to the present disclosure, it is possible to provide a lens barrel with high lens holding accuracy.

A perspective view of a digital camera according to an embodiment A perspective view of a lens barrel according to an embodiment An exploded perspective view of a lens barrel according to an embodiment Principal part configuration diagram of the third group unit of the lens barrel according to the embodiment An exploded perspective view of the fourth unit of the lens barrel according to the embodiment Principal part block diagram of the lens barrel according to the embodiment An exploded perspective view of a third group unit, a fourth group unit, and a cam frame of a lens barrel according to an embodiment Principal part block diagram of the third lens unit, the fourth lens unit, and the cam frame of the lens barrel according to the embodiment The disassembled perspective view which shows the mounting state of the FPC guide frame which concerns on embodiment Three views of the FPC guide frame according to the embodiment Inner peripheral surface development view of the cam frame according to the embodiment Sectional view in each state of the lens barrel according to the embodiment An exploded perspective view of a first group unit, a second group unit, and a cam frame of a lens barrel according to an embodiment A diagram for explaining a first group main cam groove, a first group auxiliary cam groove, and a second group cam groove of a cam frame according to an embodiment. An exploded perspective view of a master flange unit and an imaging device unit according to an embodiment Principal cross-sectional schematic views of a master flange unit and an imaging device unit according to an embodiment

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, the detailed description may be omitted if necessary. For example, detailed descriptions of already well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

  It is noted that the inventors provide the attached drawings and the following description so that those skilled in the art can fully understand the present disclosure, and intend to limit the claimed subject matter by these is not.

  Embodiments of the present disclosure will be described using the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and ratios of respective dimensions may be different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and proportions may be included between the drawings.

  In the following embodiments, a digital camera will be described as an example of the imaging apparatus. In the following description, with the digital camera at the horizontal position, the subject side is "front side", the opposite side (image side) of the subject is "back side", the vertically upper side is "upper side", and the vertically lower side is "lower side" The right side is referred to as “right side” when the lens barrel is viewed from the object side, and the left side is referred to as “left side” when viewed from the object side. The horizontal position is a kind of attitude of the digital camera, and when photographing in the horizontal position, the long side direction of the horizontally long rectangular image substantially coincides with the horizontal direction in the image.

[1. Overall configuration of digital camera]
The configuration of the digital camera 3000 will be described with reference to the drawings. FIG. 1 is a perspective view of the digital camera 3000. FIG. 2 is a perspective view of the lens barrel 2000. FIG. In FIG. 2A, the lens barrel 2000 in the collapsed state, in FIG. 2B, the lens barrel 2000 in shooting (wide state), and in FIG. 2C, in shooting (tele state). A lens barrel 2000 is illustrated. In the lens barrel 2000 according to the present embodiment, the tele state is the most extended state.

  As shown in FIG. 1, the digital camera 3000 includes a housing 3100 and a lens barrel 2000.

  The lens barrel 2000 is provided with a retractable zoom mechanism. As shown in FIG. 2, the lens barrel 2000 has the shortest overall length in the retracted state, and conversely, the longest overall length in the tele state.

[2. Configuration of Lens Barrel]
Next, the configuration of the lens barrel 2000 will be described with reference to the drawings. FIG. 3 is an exploded perspective view of the lens barrel 2000. As shown in FIG. The one-dot and dash line indicates the optical axis AX. In this chapter and FIG. 3, since the schematic configuration of the lens barrel is described, reference numerals in sentences and reference numerals in the drawings may be omitted.

  The optical system includes a first lens group G1 to a sixth lens group G6 (see FIG. 12C). In the following description, a direction parallel to the optical axis AX is “optical axis direction”, a direction perpendicular to the optical axis direction is “radial direction”, and a direction along a circle centered on the optical axis AX is “circumferential direction ". The optical axis AX substantially coincides with the axial center of each frame constituting the lens barrel 2000.

  The lens barrel 2000, as shown in FIG. 3, includes a fixed frame unit 2010, a first group rectilinear frame 2020, a first group unit 2030, a second group unit 2040, a third group unit 2050 (first frame), and a fourth group unit 2060. (Third frame), cam frame 2070 (second frame), FPC guide frame 2080, fifth group unit 2090, sixth group unit 2100, sixth group moving unit 2110, drive gear 2120, zoom motor unit 2130, master A flange unit 2140 and an imaging element unit 2150 are provided.

  The fixed frame unit 2010 is formed in a hollow cylindrical shape. The fixed frame unit 2010 has a rotation restricting groove and a cam groove on the inner peripheral surface. The zoom motor unit 2130 is attached to the outer peripheral surface of the fixed frame unit 2010. The zoom motor unit 2130 is a drive source for extending the lens barrel 2000.

  The master flange unit 2140 is a plate-like resin member that covers the rear of the fixed frame unit 2010. The master flange unit 2140 has an opening formed in the vicinity of the optical axis AX. A part of the imaging element unit 2150 is fitted in the opening of the master flange unit 2140.

  The first group rectilinear frame 2020 is formed in a hollow cylindrical shape, and is disposed inside the fixed frame unit 2010. The first group rectilinear frame 2020 has a rotation restricting protrusion on the outer peripheral surface and a rotation restricting groove on the inner peripheral surface. The rotation restricting protrusion is engaged with the rotation restricting groove of the fixed frame unit 2010. As a result, the first lens unit rectilinear frame 2020 is held so as to be non-rotatable relative to the fixed frame unit 2010 and movable back and forth in the optical axis direction. Further, the rotation restricting groove is formed along the optical axis direction on the inner peripheral surface of the first lens unit rectilinear frame 2020.

  The first group unit 2030 holds a first lens group G1 for taking light into the lens barrel 2000 (see FIG. 12C). The first group unit 2030 is formed in a cylindrical shape, and is disposed inside the first group rectilinear frame 2020. The first group unit 2030 has a rotation restricting protrusion on the outer peripheral surface, and has a rotation restricting groove and a cam follower on the inner peripheral surface. The rotation restricting protrusion is engaged with the rotation restricting groove of the first group rectilinear frame 2020. As a result, the first group unit 2030 is held so as to be non-rotatable relative to the first group rectilinear frame 2020 and movable back and forth in the optical axis direction. The rotation restricting groove of the first group unit 2030 is formed on the inner circumferential surface of the first group unit 2030 along the optical axis direction.

  The second group unit 2040 holds the second lens group G2 (see FIG. 12C). The second lens group G2 is a lens group used during zooming for changing the angle of view of a subject image. The second group unit 2040 is formed in a disk shape, and is disposed inside the first group unit 2030. The second group unit 2040 has a rotation restricting portion 2041 extending rearward from the outer peripheral surface in the optical axis direction, and a cam follower 2042 projecting inward on the inner peripheral surface near the rear end of the rotation restricting portion 2041 (FIG. 13). reference). The rotation restricting portion 2041 is engaged with the rotation restricting groove of the first group unit 2030. As a result, the second group unit 2040 is held so as not to rotate relative to the first group unit 2030 and to be movable back and forth in the optical axis direction.

  The third group unit 2050 holds the third lens group G3 (see FIG. 12C). The third lens group G3 is a lens group used in zooming for changing the angle of view of a subject image and in correcting image blurring due to camera shake or the like of the user. The third group unit 2050 is formed in a cylindrical shape and disposed inside the cam frame 2070. The third group unit 2050 has a cam follower, a rotation restricting protrusion, and a rotation restricting slit. The rotation restricting protrusion of the third group unit 2050 is erected near the front end of the outer peripheral surface. The rotation restricting protrusion is engaged with the rotation restricting groove on the inner peripheral surface of the first group unit 2030. As a result, the third group unit 2050 is held so as not to rotate relative to the first group unit 2030 and to be movable back and forth in the optical axis direction.

  The fourth group unit 2060 holds the fourth lens group G4 (see FIG. 12C). The fourth lens group G4 is a lens group used in zooming for changing the angle of view of a subject image. The fourth group unit 2060 is formed in a disk shape, and is disposed inside the third group unit 2050. The fourth group unit 2060 has a rotation restricting portion protruding outward in the radial direction and a cam follower protruding further outward in the radial direction from the rotation restricting portion. The rotation restricting portion is engaged with the rotation restricting slit of the third group unit 2050. Thus, the fourth group unit 2060 is held so as not to be able to rotate relative to the third group unit 2050 and to be movable back and forth in the optical axis direction. The rear side in the optical axis direction of the fourth group unit 2060 is composed of a shutter unit 2065 for controlling the amount of light reaching the imaging device.

  The fifth group unit 2090 holds the fifth lens group G5 (see FIG. 12C). The fifth lens group G5 is a lens group used in zooming for changing the angle of view of a subject image. The fifth group unit 2090 is formed in a disk shape, and is disposed inside the third group unit 2050. The fifth group unit 2090 has a rotation restricting portion protruding outward in the radial direction and a cam follower protruding further outward in the radial direction from the rotation restricting portion. The rotation restricting portion engages with the rotation restricting slit of the third group unit. United. Thus, the fourth group unit 2060 is held so as not to be able to rotate relative to the third group unit 2050 and to be movable back and forth in the optical axis direction.

  The sixth group unit 2100 holds the sixth lens group G6 (see FIG. 12C). The sixth lens group G6 is a lens group used in focusing which adjusts the in-focus state of a subject image.

  The sixth group moving unit 2110 is formed in a cylindrical shape, and holds the sixth group unit 2100 inside. The sixth group moving unit 2110 has a flange portion in the vicinity of the rear end on the outer peripheral surface, and has a rotation restricting protrusion which protrudes further outward in the radial direction from the flange portion. The rotation restricting protrusion is engaged with the rotation restricting groove of the inner peripheral surface of the fixed frame unit 2010. The sixth group moving unit 2110 is held so as not to rotate relative to the fixed frame unit 2010 and to be movable back and forth in the optical axis direction. A focus motor is fixed to the sixth group moving unit 2110, and the relative position between the sixth group moving unit 2110 and the sixth group unit 2100 in the optical axis direction can be adjusted by driving the motor. The sixth group moving unit 2110 has a cam follower projecting radially outward in the vicinity of the front end of the outer peripheral surface.

  The cam frame 2070 is formed in a cylindrical shape, and is disposed inside the first group unit 2030. The cam frame 2070 has a plurality of cam grooves on the inner circumferential surface and the outer circumferential surface, and also has a cam follower and a driven gear portion near the rear end of the outer circumferential surface. The cam follower is engaged with the cam groove of the inner peripheral surface of the fixed frame unit 2010, and the driving force of the zoom motor unit 2130 is transmitted to the driven gear portion via the driving gear 2120. When the zoom motor unit 2130 is energized to apply a driving force, the cam frame 2070 moves back and forth in the optical axis direction while rotating around the optical axis AX with respect to the fixed frame unit 2010.

  The cam followers of the first group unit 2030 and the second group unit 2040 are engaged with the cam grooves of the outer peripheral surface of the cam frame 2070, and the cam grooves of the inner peripheral surface of the cam frame 2070 are third group unit 2050, fourth group The cam followers of the unit 2060, the fifth group unit 2090 and the sixth group moving unit are engaged. Here, when the zoom motor unit 2130 is energized and a driving force is applied, the first group unit 2030, second group unit 2040, third group unit 2050, fourth group unit 2060, fifth group unit 2090 and sixth group moving unit 2110 are fixed frames. It does not rotate relative to the unit 2010 but moves back and forth in the optical axis direction.

  In the configuration described above, the lens barrel 2000 arranges the first lens group G1 to the sixth lens group G6 at appropriate positions by driving the zoom motor unit 2130 and the focus motor, and performs zooming and focusing. Configuration is possible.

[3. Detailed configuration of members constituting the lens barrel]
[2. Configuration of Lens Barrel] The outline of each member constituting the lens barrel 2000 has been described. In the following, details of each component constituting the lens barrel 2000 will be described.

[3-1.3 group unit]
The configuration of the third group unit 2050 will be described in more detail using FIG.

  FIG. 4 is a schematic view of the third group unit 2050. As shown in FIG. FIG. 4A is a view of the third group unit 2050 as viewed from the front side in the optical axis direction. FIG. 4B is a view of the third group unit 2050 viewed from the outer side in the radial direction. FIG.4 (c) is sectional drawing in the AA line in FIG.4 (b). FIG. 4D is a cross-sectional view taken along the line B-B in FIG. FIG.4 (e) is sectional drawing in the CC line in FIG.4 (b).

  As shown in FIG. 4A, the third group unit 2050 is formed in a cylindrical shape and has three cam followers 2051 protruding from the outer peripheral surface. As shown in FIG. 4B, only one of the three cam followers 2051 is held by the cam follower base portion 2053. The cam follower base portion 2053 is separated from the main body portion 2057 of the third group unit 2050 and is coupled to the main body portion 2057 of the third group unit 2050 by two thin portions 2052.

  As shown in FIG. 4C, the radial thickness of the thin portion 2052 is thinner than the radial thickness of the thin portion peripheral portion 2057a of the main portion 2057 of the third group unit 2050. Further, as shown in FIGS. 4C and 4D, the thickness in the radial direction of the thin portion 2052 is thinner than the thickness in the radial direction of the cam follower base portion 2053. Further, the thin-walled portion 2052 is formed shorter in length in the optical axis direction than the cam follower base portion 2053. With such a shape, the cam follower base portion 2053 can swing around the thin portion 2052 as a fulcrum, and is configured to be easily displaced in the radial direction.

  In addition, the thin portions 2052 are disposed at mutually separated positions. More specifically, two thin portions 2052 are arranged at two places separated from each other in the circumferential direction. Therefore, as compared with the case where the cam follower base portion 2053 and the main body portion 2057 are coupled by the thin portion 2052 disposed at one place, the thin portion 2052 is less likely to twist when the cam follower base portion 2053 is displaced. As a result, the cam follower 2051 held by the cam follower base portion 2053 is easily displaced in the radial direction, and hardly displaced in the circumferential direction or the optical axis direction. That is, when the thin portions 2052 are arranged at positions separated from each other (when arranged at a plurality of places), the fulcrums at which the cam follower base portion 2053 swings are plural. In this case, the thin portion 2052 is less likely to be twisted as compared with the case where the thin portion 2052 is disposed only at one position and the cam follower base portion 2053 swings by only one fulcrum. This is because the plurality of fulcrums regulate twisting with each other. Furthermore, in the case where the thin portions 2052 are disposed apart from each other, it is more likely to twist the thin portions 2052 in the circumferential direction or the optical axis direction, as compared with the case where the thin portions 2052 are disposed at only one place. It is because a big power is necessary.

  Further, as shown in FIG. 4E, in the cam follower base portion 2053, the front end portion 2053a opposite to the thin portion 2052 in the optical axis direction faces the base portion facing portion 2057b which is a part of the main body portion 2057. ing. The base facing portion 2057 b is located radially inward of the cam follower base 2053. A gap is provided in the radial direction between the front end portion 2052 a of the cam follower base portion 2053 and the base facing portion 2057 b of the main body portion 2057. Furthermore, a restriction projection 2054 is provided on the base facing portion 2057b of the main body portion 2057 at a position facing the front end portion 2053a of the cam follower base 2053 and on the opposite side of the cam follower 2051 with the cam follower base 2053 interposed therebetween. ing. With such a configuration, the gap between the cam follower base portion 2053 and the main body portion 2057 is partially reduced.

  By forming the third group unit 2050 in this manner, the amount of displacement when the cam follower base portion 2053 is displaced radially inward is restricted. That is, when the cam follower base portion 2053 is displaced inward in the radial direction, when the cam follower base portion 2053 is displaced by a predetermined amount or more, the front end portion 2053a of the cam follower base portion 2053 abuts on the restriction projection 2054 and is not displaced further. By restricting the displacement amount of the cam follower base portion 2053, the dropout of the cam follower 2051 from the cam groove of the cam follower 2051 is suppressed when an external force such as a drop impact is applied to the lens barrel, so the reliability of the lens barrel 2000 is improved. I can do it.

[3-2.4 group unit]
Next, the configuration of the fourth unit 2060 will be described in detail with reference to FIG.

  FIG. 5 is an exploded perspective view of the fourth unit 2060. As shown in FIG. As shown in FIG. 5, the fourth group unit 2060 includes a light shielding sheet 2061, screws 2062, a plate spring 2063 (biasing member), a fourth group frame 2064, and a shutter unit 2065, and holds the fourth lens group G4.

  A leaf spring 2063 is held by a screw 2062 in the fourth group frame 2064. The leaf spring 2063 is disposed at a position facing the cam follower base portion 2053.

  A light shielding sheet 2061 is disposed on the front side of the fourth group frame 2064 in the optical axis direction to prevent unnecessary light rays from entering the fourth lens group G4.

  The shutter unit 2065 is integrated with the fourth group frame 2064 by bonding and fixing the fourth lens group G4 to the fourth group frame 2064 and then inserting the hook portion 20651 into the hook holding portion 20641 formed in the fourth group frame 2064 Do.

[3.3.3 group unit + 4 group unit + cam frame]
Next, a configuration in which the third group unit 2050 and the fourth group unit 2060 are combined with the cam frame 2070 will be described with reference to FIGS.

  FIG. 6 is a schematic view of the lens barrel 2000. As shown in FIG. FIG. 6A is a view of a state in which the third group unit 2050 and the fourth group unit 2060 are combined with the cam frame 2070 as viewed from the front in the optical axis direction. FIG. 6 (b) is a cross-sectional view taken along the line D-D in FIG. 6 (a).

  As shown in FIG. 6B, the leaf spring 2063 fixed to the fourth unit 2060 biases the cam follower base portion 2053 radially outward from the inside. Thereby, the cam follower 2051 is biased toward the cam groove 2072. By configuring this way. The fourth lens unit 2060 is biased in one radial direction with respect to the cam frame 2070 through the third lens unit 2050.

  In the third group unit 2050, the cam follower base portion 2053 is displaced radially outward, whereby the cam follower 2051 is pressed against the cam groove 2072 of the cam frame 2070. Further, the cam follower base portion 2053 is biased in one radial direction, and the cam follower 2051 is fitted into the tapered portion of the cam groove 2072.

  Therefore, rattling in the optical axis direction of the third group unit 2050, the fourth group unit 2060, and the cam frame 2070 is restricted. With this configuration, the lens barrel 2000 causes the cam frame 2070 to hold two of the third group unit 2050 and the fourth group unit 2060 against the cam frame 2070 using one leaf spring 2063. I can do it. Therefore, in the lens barrel 2000, the holding accuracy of the third lens group G3 and the fourth lens group G4 is high. Therefore, according to this configuration of the lens barrel 2000, the relative positional accuracy of the third lens group G3 and the fourth lens group G4 can be improved.

  FIG. 7 is an exploded perspective view of the third group unit 2050, the fourth group unit 2060, and the cam frame 2070 of the lens barrel 2000. FIG. 7A is an exploded perspective view of the third group unit 2050, the fourth group frame 2064, and the cam frame 2070. FIG. 7B is an exploded perspective view when the shutter unit 2065 is inserted from the rear side in the optical axis direction of FIG. 7A.

  In FIG. 7A, three alignment holes 2055 are provided on the outer peripheral surface of the third group unit 2050 (only two locations appear in FIG. 7A). The cam frame 2070 is provided with a notch 2071 on the front side of the optical axis direction. The shutter unit 2065 of the fourth group unit 2060 is inserted into the third group unit 2050 from the rear side of the third group unit 2050, and the fourth group frame 2064 and the fourth group unit 2050 are engaged by the engagement between the hook portion 20651 and the hook holding portion 20641 described above. Integrated. The third group unit 2050 is held movably in the optical axis direction with respect to the cam frame 2070. When the third group unit 2050 is moved to the most extended position with respect to the cam frame 2070, as shown in FIG. 7B, the aligning hole 2055 and the notch 2071 face each other, and one through hole is It is formed.

  FIG. 8 is a view showing the principal parts of the third group unit 2050, the fourth group unit 2060, and the cam frame 2070 of the lens barrel 2000. FIG. 8A is a front view showing a state where the third group unit 2050 and the fourth group unit 2060 are combined with the cam frame 2070 (before the shutter unit is inserted). FIG. 8B is a cross-sectional view taken along the line E-E in FIG. 8A showing a state in which the third group unit 2050 and the fourth group unit 2060 are combined with the cam frame 2070 (before shutter unit insertion).

  As shown in FIG. 8, a jig is inserted from the alignment hole 2055 of the third group unit 2050, and the fourth group frame 2064 is moved to the fourth lens group while adjusting the position of the fourth lens group G4 with respect to the third lens group G3. It is possible to adhesively fix G4. Thereby, the lens barrel 2000 can improve the relative positional accuracy of the third lens group G3 and the fourth lens group G4 in a state where the third group unit 2050, the fourth group unit 2060 and the cam frame 2070 are assembled. .

  The lens barrel 2000 according to this embodiment has a configuration in which the alignment hole 2055 and the notch 2071 face each other when the third unit 2050 is most extended to the cam frame 2070. By this configuration, a through hole can be formed when aligning the fourth lens group G4, but no through hole is formed at other zoom positions used at the time of shooting so that light leakage does not occur. It is configured.

  As described above, since the lens barrel 2000 can improve the relative position accuracy of the third lens group G3 and the fourth lens group G4, the resolution performance of the lens barrel can be improved. Alternatively, the lens barrel 2000 can allocate an allowance for the accuracy in the adjustment between the third lens group G3 and the fourth lens group G4 to the miniaturization of the lens. And weight reduction can be achieved.

  In the present embodiment, the configuration in which the leaf spring 2063 is fixed to the fourth unit 2060 as the urging member is shown, but an urging means other than a leaf spring such as a coil spring provided with a leaf spring in the third unit 2050 It goes without saying that a configuration such as biasing is possible. Alternatively, the material of the third group unit 2050 may be made of a material such as metal and may be directly biased by the elasticity of the thin portion 2052.

[4. Detailed Configuration of Flexible Board Routing Unit]
[4-1. FPC guide frame]
In the following, a mirror of a flexible substrate (OIS flexible 2056, shutter flexible 2066) for connecting a shake correction unit and shutter unit 2065, which are built in the lens barrel 2000, to the main body substrate using FIGS. 9 to 12 The routing in the cylinder will be described.

  FIG. 9 is an exploded perspective view showing a mounted state of the FPC guide frame 2080, FIG. 10 is a three-face view of the FPC guide frame 2080, and FIG. 11 is an inner developed view of the cam frame 2070.

  In FIG. 9, the FPC guide frame 2080 is disposed inside the cam frame 2070 and outside the sixth group moving unit 2110. The FPC guide frame 2080 can move in the optical axis direction independently of the cam frame 2070 and the sixth group moving unit 2110. The sixth group moving unit 2110 is provided with a guide wall 2111 for guiding the movement of the FPC guide frame 2080 in the optical axis direction. The rectilinear guide projection 2083 slides inside the guide wall 2111, and the FPC guide frame 2080 moves in the optical axis direction.

  10 (a) is a view of the FPC guide frame 2080 viewed from the front side in the optical axis direction, FIG. 10 (b) is a view of the FPC guide frame 2080 viewed from the horizontal direction perpendicular to the optical axis AX, FIG. ) Is a view of the FPC guide frame 2080 from the vertical direction perpendicular to the optical axis AX. As shown in FIG. 10, the FPC guide frame 2080 has a rectilinear guide projection 2083, a cam follower a2081, and a cam follower b2082. As shown in FIG. 10B, the FPC guide frame 2080 is formed in an L shape when viewed in the horizontal direction perpendicular to the optical axis AX.

  The rectilinear guide projection 2083 is slidably disposed on the guide wall 2111 of the sixth group moving unit 2110, and is held movably in the optical axis direction with respect to the sixth group moving unit 2110. The cam followers a2081 and the cam followers b2082 are engaged with the cam grooves 81 and the cam grooves 82 on the inner peripheral surface of the cam frame 2070, respectively.

  In FIG. 11, the cam groove 81 is divided into sections X by other cam grooves. In the cam groove 82, the section Y is divided by another cam groove, and the rear end side protrudes from the cam frame 2070.

  However, since the cam follower a2081 and the cam follower b2082 are provided at positions where the height in the optical axis direction and the phase in the circumferential direction are different, at least one of the cam follower a2081 and the cam follower b2082 always has the cam groove 81 and the cam groove 82 , And can be driven continuously.

  That is, when the cam follower a 2081 exists in the section X of the cam groove 81, the cam follower b 2082 slides in the cam groove 82, so that the FPC guide frame 2080 is suppressed from dropping from the cam frame 2070. Further, when the cam follower b2082 exists in the section Y of the cam groove 82, the cam follower a2081 slides in the cam groove 81, so that the FPC guide frame 2080 is prevented from dropping from the cam frame 2070.

  Accordingly, the FPC guide frame 2080 can be moved forward and backward in the optical axis direction independently of the other units as the cam frame 2070 rotates.

  FIG. 12 shows sectional views of the lens barrel 2000 in each state.

  FIG. 12A shows a cross-sectional view of the lens barrel 2000 in a retracted state. FIG. 12B shows a cross-sectional view of the lens barrel 2000 in the wide (maximum wide-angle end) state. FIG. 12C shows a cross-sectional view of the lens barrel 2000 in the tele (maximum telephoto end) state.

  As shown in FIGS. 12 (a) to 12 (c), the OIS flex 2056 and the shutter flex 2066 are guided along the L-shaped FPC guide frame 2080 in each state of the lens barrel 2000, and the lens barrel Connected to the end contacts. In the retracted state shown in FIG. 12A, the piece 2084 formed perpendicular to the optical axis AX of the FPC guide frame 2080 abuts on the rear end of the cam frame 2070. In the wide state shown in FIG. 12B and the tele state shown in FIG. 12C, the piece 2084 formed perpendicular to the optical axis AX of the FPC guide frame 2080 is the optical axis direction from the rear end of the cam frame 2070 Move backwards.

  In FIGS. 12A to 12C, when the FPC guide frame 2080 moves back and forth in the optical axis direction, the amount of slack of the OIS flexible substrate 2056 hardly changes even in each state of the lens barrel 2000. With such a configuration, the FPC guide frame 2080 prevents the slack OIS flexible board 2056 from being caught in another part or being pinched between other frames.

  As described above, by appropriately setting the cam groove 81 and the cam groove 82 of the cam frame 2070, it is possible to control the amount of slack of the OIS flexible board 2056.

  On the other hand, the shutter flexible 2066 is different from the OIS flexible 2056 in the state.

  In FIG. 12A to FIG. 12C, the shutter flexible 2066 is overlapped at the same position as the OIS flexible 2056 and drawn out of the lens barrel 2000.

  If the gap t between the third group unit 2050 and the fourth group unit 2060 does not change even if the lens barrel is extended, the amount of slack is constant, but in the case of the present embodiment, the third group unit The gap t between 2050 and the fourth unit 2060 changes.

  In the case of the present embodiment, there is no change in the gap t between the third group unit 2050 and the fourth group unit 2060 in the collapsed state, the wide state, but the gap t in the third group unit 2050 and the fourth group unit 2060 in the tele state. Is in a state of spreading.

  Therefore, in the present embodiment, as shown in FIG. 5, a reinforcing plate 2067 is provided on a part of the shutter flexible 2066. The reinforcing plate 2067 is made of a harder material than the shutter flexible 2066. The portion of the shutter flexible 2066 where the reinforcing plate 2067 is provided is limited in bending by the portion of the reinforcing plate 2067. In FIG. 12C, since the bending of the shutter flexible 2066 is limited by the reinforcing plate 2067, the shutter flexible 2066 is bent at the rear side in the optical axis direction as compared with the OIS flexible 2056.

  As a result, the amount of sag of the shutter flexible 2066 can be controlled, and the shutter flexible 2066 can be prevented from being caught by another portion or being pinched between other frames.

  With the above configuration, even when the amount of movement of the actuator in the optical axis direction in the lens barrel 2000 is large, or when two or more types of actuators are separately extended, the OIS flexible 2056 and the shutter flexible 2066 are other It can be prevented from being caught in a part or pinched between other frames.

  In the present embodiment, although the reinforcing plate 2067 is provided on the shutter flexible 2066 to limit the bending, the width of the shutter flexible 2066 may be partially expanded to make it difficult to bend. In addition, the bending may be limited by hooking a portion where the width of the shutter flexible 2066 is widened to another frame.

[Detailed Configuration of 5.1 Group Unit, 2 Group Unit Drive Section]
The following describes the configuration of the drive units of the first group unit 2030 and the second group unit 2040.

[5-1. 1 group unit, 2 group unit drive part configuration]
FIG. 13 is an exploded perspective view showing the configuration of drive units of the first group unit 2030, the second group unit 2040, and the cam frame 2070.

  In FIG. 13, the first group unit 2030 has three main cam followers 2031 on its inner circumferential surface (only one is shown in FIG. 13). The first group unit 2030 has two auxiliary cam followers 2032 having a smaller cross-sectional area and a smaller amount of radial protrusion than the main cam followers 2031 on the inner circumferential surface (only one is shown in FIG. 13). Further, in the first group unit 2030, a rotation restricting groove 2033 is formed on the inner circumferential surface along the optical axis direction.

  The second group unit 2040 has a rotation restricting portion 2041 extending rearward from the outer peripheral edge in the optical axis direction, and a cam follower 2042 is provided on the inner side near the rear end of the rotation restricting portion 2041. The rotation restricting portion 2041 is engaged with the rotation restricting groove 2033 of the first group unit 2030. With such a configuration, the second group unit 2040 does not rotate relative to the first group unit 2030, and is held movably back and forth in the optical axis direction.

  Here, the radial thickness of the rotation restricting portion 2041 of the second group unit 2040 is formed to be substantially the same thickness as the depth of the rotation restricting groove 2033 of the first group unit 2030. With this configuration, the rotation restricting portion 2041 can be disposed so as to fit within the rotation restricting groove 2033 of the first group unit 2030 without protruding inward in the radial direction from the inner surface of the first group unit 2030. Therefore, the lens barrel 2000 does not increase the thickness in the radial direction, and the first main cam groove 31 and the first auxiliary cam groove 32 for the first group unit 2030 and the second group unit 2040 on the outer peripheral surface of the cam frame 2070. The second group cam grooves 42 can be arranged at the same time.

  FIG. 14 is a view for explaining the first group main cam groove 31, the first group auxiliary cam groove 32, and the second group cam groove 42 of the cam frame 2070. 14 (a) is a development of the outer peripheral surface of the cam frame 2070, FIG. 14 (b) is a cross-sectional view of the first auxiliary cam groove 32, and FIG. 14 (c) is a cross-sectional view of the second cam groove 42.

  In FIG. 14A, eight cam grooves are provided on the outer peripheral surface of the cam frame 2070: three first group main cam grooves 31, two first group auxiliary cam grooves 32, and three second group cam grooves 42. Is formed.

  The first group main cam groove 31 slidably holds the main cam follower 2031 of the first group unit 2030. The first group auxiliary cam groove 32 slidably holds the auxiliary cam follower 2032 of the first group unit 2030. The second group cam groove 42 slidably holds the cam follower 2042 of the second group unit 2040.

  In FIG. 14A, the first group auxiliary cam groove 32 and the second group cam groove 42 partially intersect with each other.

  14B and 14C, the second cam groove 42 is formed deeper than the first auxiliary cam groove 32, and the cam follower 2042 can slide in the deep portion of the second cam groove 42. It is in the state of being held.

  Here, since the first group unit 2030 is exposed to the outside of the digital camera 3000, a very large external force is applied when the digital camera 3000 falls or the like.

  On the other hand, since the second group unit 2040 is accommodated inside the lens barrel 2000, only a small force is applied as compared with the first group unit 2030.

  As shown in FIG. 14A, the first group main cam groove 31 is formed so as not to intersect (do not interfere with) other cam grooves. Therefore, the main cam follower 2031 is always held slidably in the first group main cam groove 31. On the other hand, the first group sub cam groove 32 is formed such that a portion thereof intersects with the second group cam groove 42. Here, when the auxiliary cam follower 2032 is at the intersection position, the auxiliary cam follower 2032 does not slide in the first group sub cam groove 32. Therefore, the lens barrel 2000 is formed so that the positions P, Q, R at which the first group sub cam groove 32 and the second group cam groove 42 intersect are not present in the same plane perpendicular to the optical axis AX. With such a configuration, a total of four or more of the first group unit 2030 is engaged with three first group main cam grooves 31 and one of at least two first group sub cam grooves 32. As compared with the case where only three of the first group main cam grooves 31 are engaged, a higher strength can be obtained. For example, when one of the auxiliary cam followers 2032 does not slide in the first group sub cam groove 32 at position P, the other of the auxiliary cam followers 2032 is not at position Q or position R. Therefore, at least one of the auxiliary cam followers 2032 is 1 The group sub cam groove 32 is slidably held.

  Further, the depth of the sliding surface of the cam follower 2042 becomes shallow at the portion where the second group cam groove 42 intersects the first group auxiliary cam groove 32, but the second group unit 2040 is smaller than the first group unit 2030. It is hard to come off because only force is applied.

  As described above, by forming the cam grooves for the first group unit 2030 and the second group unit 2040 on the outer peripheral surface of the cam frame 2070, the diameter of the lens barrel 2000 is not increased. The group unit 2040 can be driven. Further, as compared with the case where the cam groove 42 for the second group unit 2040 is formed on the inner peripheral surface of the cam frame 2070, more cam grooves can be arranged on the inner peripheral surface of the cam frame 2070, The degree of freedom in arranging the cam groove on the inner peripheral surface of the cam frame 2070 is increased. With such a configuration, the lens barrel 2000 can drive more units independently, or form more cam grooves within a limited dimension in the optical axis direction, and the lens mirror It is possible to reduce the dimension of the barrel 2000 in the optical axis direction.

  Also, by providing the first group sub cam groove 32 and sliding the auxiliary cam follower 2032, the lens barrel 2000 can improve the strength of the first group unit 2030.

[6. Dustproof configuration of image sensor fixing portion]
In the following, the dustproof construction of the image sensor fixing portion will be described with reference to FIG. 15 and FIG.

  FIG. 15 is an exploded perspective view of the master flange unit 2140 and the imaging device unit 2150.

  In FIG. 15, the master flange unit 2140 has a master flange 2142 and a dustproof sheet 2141.

  An opening 2142 a larger than the imaging element 2151 is formed in the master flange 2142.

  On an inner diameter portion of the master flange 2142, a dustproof sheet 2141 having an opening 2141a substantially the same size as the image pickup device 2151 is attached.

  The dustproof sheet 2141 is formed by punching a light shielding resin thin plate, and a plurality of slits are formed around the opening 2141a.

  FIG. 16 is a schematic view showing a cross section when the master flange unit 2140 and the imaging device unit 2150 are combined.

  The opening 2141 a of the dustproof sheet 2141 is slightly smaller than the imaging device 2151, so the edge of the opening 2141 a is in contact with the outer periphery of the imaging device 2151. With this configuration, the outer peripheral portion of the imaging element 2151 is in a state of being pressed by the dustproof sheet 2141.

  With this configuration, the dustproof sheet 2141 shields the space in the lens barrel and the space outside the imaging device 2151, so that foreign substances such as dust and dirt are less likely to be generated inside the lens barrel. In addition, extra light from the periphery of the imaging element 2151 is prevented from entering the image.

[7. Other embodiments]
As described above, the embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, and the like have been made. Moreover, it is also possible to combine each component demonstrated by the said embodiment, and to set it as a new embodiment.

  Therefore, other embodiments will be exemplified below.

  In the embodiment, the thin portions 2052 connecting the cam follower base portion 2053 and the main body portion 2057 of the third group unit 2050 are disposed at mutually separated positions in the circumferential direction about the optical axis AX. The present disclosure is not limited to this. It may be arranged at positions mutually separated in the direction along the optical axis AX.

  In the embodiment, although two thin portions 2052 are present, the present disclosure is not limited to this. The number of thin portions may be any number.

  In the embodiment, the cam followers 2051 are disposed radially outside the cam follower base portion 2053. However, the present disclosure is not limited to this. The cam follower may be located radially inward of the cam follower base portion, and the cam groove may be located further inward.

  In the embodiment, the cam follower base portion 2053 is biased by a plate spring, but the present disclosure is not limited to this. The cam follower base itself may be configured to be biased outward, or another biasing member such as a torsion coil spring may be used.

  Further, in the embodiment, the alignment hole 2055 is formed in the third group unit 2050 and the notch 2071 is formed in the cam frame 2070, but the present disclosure is not limited to this. It is also possible to replace the alignment holes and cutouts as appropriate, and to form both of them with alignment holes or cutouts.

  In the embodiment, when the third group unit 2050 is moved to the most extended position with respect to the cam frame 2070, the aligning hole 2055 and the notch 2071 face each other, and one through hole is formed. However, the present disclosure is not limited thereto. The alignment hole and the notch may face each other in the middle of the zoom section, and one through hole may be formed.

[Supplementary Note 1]
A first moving group (for example, a third lens group G3);
A second moving group (for example, a fourth lens group G4) including at least one lens different from the first moving group;
A first frame (for example, a third group unit 2050) for holding the first movement group;
A second frame (for example, a fourth group unit 2060) disposed inside the first frame and holding a lens in the second moving group;
And a third frame (for example, a cam frame 2070) disposed outside the first frame and movably holding the first frame in the optical axis direction;
In the first frame, at least one hole (for example, a centering hole 2055) is formed on the outer peripheral surface,
In the third frame, at least one hole or notch (for example, a notch 2071) is formed on the outer peripheral surface,
When the first frame is driven to a predetermined position in the drivable range with respect to the third frame, the hole of the first frame and the hole or notch of the third frame Face each other,
Lens barrel (e.g., lens barrel 2000).

[Supplementary Note 2]
A lens barrel (for example, a lens barrel 2000) that holds at least one lens,
A fixed frame (for example, a fixed frame unit 2010),
A drive frame (for example, third group unit 2050, fourth group unit 2060) movable in the optical axis direction with respect to the fixed frame;
A moving unit that moves with the movement of the drive frame and includes an electrical component;
A flexible substrate (for example, OIS flexible 2056, shutter flexible 2066) of which one end is connected to the moving unit;
An FPC guide frame (for example, an FPC guide frame 2080) which moves in the optical axis direction independently of the moving unit and guides the flexible substrate;
Lens barrel equipped with

[Supplementary Note 3]
A lens barrel (for example, a lens barrel 2000) that holds at least one lens,
A fixed frame (for example, a fixed frame unit 2010),
A first moving unit and a second moving unit movable in the optical axis direction with respect to the fixed frame and provided with an electrical component;
A first flexible substrate (for example, OIS flexible 2056), one end of which is connected to the first moving unit and the other end of which is fixed to the fixed frame;
And a second flexible substrate (for example, a shutter flexible 2066) having one end connected to the second moving unit and the other end fixed to the same position as the first flexible substrate of the fixed frame,
The second flexible substrate includes a bending restricting portion (for example, a reinforcing plate 2067) which restricts bending of a partial region of the second flexible substrate.
Lens barrel (e.g., lens barrel 2000).

[Supplementary Note 4]
A first frame (for example, a cam frame 2070) formed in a substantially cylindrical shape;
First lens group (for example, first lens group G1) having at least one lens movable in the optical axis direction sequentially from the subject side to the image plane side, second lens group (for example, second lens group) G2),
A second frame (for example, a first group unit 2030) for holding the first lens group and the second lens group, and a third frame (for example, a second group unit 2040);
The second frame has a first cam follower (for example, a main cam follower 2031) and a second cam follower (for example, an auxiliary cam follower 2032) which can be engaged with the first frame, and the third frame The frame has a third cam follower (e.g., a cam follower 2042) engageable with the first frame;
The first frame has a first cam groove (for example, first group main cam groove 31) and a third cam groove (for example, second group cam groove) which can be engaged with the first cam follower and the third cam follower on the outer peripheral surface 42) are formed so as not to interfere with each other, and at the same time a second cam groove (for example, first group auxiliary cam groove 32) engageable with a second cam follower is formed, and the second cam groove and the third cam The grooves are partially cross,
Lens barrel.

[Supplementary Note 5]
A master flange (eg, master flange 2142) having a first opening at the center of the optical axis;
A dustproof sheet (eg, dustproof sheet 2141) having a second opening (eg, opening 2141a) smaller than the first opening (eg, opening 2142a) held by the master flange;
An imaging element (for example, an imaging element 2151) disposed in the second opening;
In the dustproof sheet, an edge portion of the second opening is in contact with an outer peripheral portion of the imaging device.
Imaging device.

  The present disclosure is applicable to a lens barrel including an optical system, and a digital camera, a mobile phone, a smartphone, and the like using the lens barrel.

2000 lens barrel 2010 fixed frame unit 2020 first group rectilinear frame 2030 first group unit 2031 main cam follower 2032 auxiliary cam follower 2033 rotation restricting groove 2040 second group unit 2041 rotation restricting section 2042 cam follower 2050 third group unit (first frame)
2051 Cam follower 2052 Thin-walled portion 2053 Cam follower base portion 2054 Regulating projection 2055 Alignment hole 2056 OIS flexible (flexible substrate)
2057 Main body 2060 4th unit (3rd frame)
2061 light shielding sheet 2062 screw 2063 leaf spring (biasing member)
2064 4 group frame 20641 hook holding portion 2065 shutter unit 20651 hook portion 2066 shutter flexible (flexible substrate)
2067 Reinforcement plate 2070 Cam frame (second frame)
2071 notch 2072 cam groove 2080 FPC guide frame 2081 cam follower a
2082 Cam follower b
2083 rectilinear guide projection 2090 5 group unit 2 100 6 group unit 2110 guide wall 2 120 drive gear 2130 zoom motor unit 2140 master flange unit 2141 dustproof sheet 2142 master flange 2150 image sensor unit 2151 image sensor 3000 digital camera 3100 case AX Optical axis G3 Third lens group G4 Fourth lens group

Claims (9)

A first frame formed in a substantially cylindrical shape;
A first lens group having at least one lens,
A second lens group having at least one lens,
A second frame that holds the first lens group;
A third frame that holds the second lens group;
Equipped with
The first lens group and the second lens group are disposed in order from the subject side to the image plane side,
The second frame and an outer peripheral surface of the first frame are engaged by a first cam mechanism,
The third frame and the outer peripheral surface of the first frame are engaged by a second cam mechanism,
When the first frame rotates around the optical axis, the second frame and the third frame move in the optical axis direction with respect to the first frame.
Lens barrel. The third frame has a first rotation restricting portion,
The second frame has a first rotation restricting groove,
The first rotation restricting portion is engaged with the first rotation restricting groove.
The lens barrel according to claim 1. The radial thickness of the first rotation restricting portion of the third frame is formed to be substantially the same thickness as the depth of the first rotation restricting groove of the second frame.
The lens barrel according to claim 2. It further comprises a fourth frame formed in a substantially cylindrical shape and having a second rotation restricting groove on its inner circumferential surface,
The second frame is disposed inside the fourth frame, and further has a second rotation restricting portion on an outer peripheral surface thereof.
The second rotation restricting portion is engaged with the second rotation restricting groove.
The lens barrel according to claim 2. A third lens group having at least one lens and movable in the optical axis direction;
The second lens unit and the third lens unit are disposed in order from the subject side to the image plane side,
A fifth frame for holding the third lens group;
The fifth frame and the inner circumferential surface of the first frame are engaged by a third cam mechanism,
The lens barrel according to claim 4. The fifth frame has a third rotation restricting portion,
The second frame has a third rotation restricting groove on an inner circumferential surface thereof,
The third rotation restricting portion is engaged with the third rotation restricting groove.
The lens barrel according to claim 5. It further comprises a sixth frame formed in a substantially cylindrical shape and having a fourth rotation restricting groove on its inner circumferential surface,
The fourth frame is disposed inside the sixth frame, and further has a fourth rotation restricting portion on an outer peripheral surface thereof.
The fourth rotation restricting portion is engaged with the fourth rotation restricting groove.
The lens barrel according to claim 5. It further comprises a plate-like seventh frame covering the opposite side of the sixth frame from the subject,
In the seventh frame, an opening is formed in the vicinity of the optical axis, and a part of the imaging device is fitted.
The lens barrel according to claim 7. The second frame and the outer peripheral surface of the first frame are engaged by a fourth cam mechanism,
The lens barrel according to claim 8.

Images