JP2016062096A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel with high accuracy of holding a lens.SOLUTION: A lens barrel in which a lens is movable in a direction parallel to an optical axis includes: a first frame body that has a cam follower and a cam follower base portion that holds the cam follower; and a second frame body that has a cam groove capable of engaging with the cam follower. The first frame body and the second frame body move relative to one another along the optical axis. One end of the cam follower base portion is connected to a main body portion of the first frame body through at least one thin wall portion, and the other end thereof is not connected to the main body portion. The thickness in a radial direction of the lens barrel is formed such that the thin wall portion is thinner than in the cam follower base portion.SELECTED DRAWING: Figure 4

Description

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

  Patent Document 1 discloses an optical device that can improve the cam pin backlash mechanism in the cam mechanism of the lens barrel, thereby reducing the size of the optical device.

JP-A-11-109209

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

  The lens barrel according to the present disclosure includes a first frame that can move the lens in a direction parallel to the optical axis and has a cam follower and a cam follower base portion that holds the cam follower, and a cam groove that can be engaged with the cam follower. And a second frame body. The first frame body and the second frame body move relative to each other along the optical axis. One end of the cam follower base portion is connected to the main body portion of the first frame through at least one thin portion, while the other end is not connected to the main body portion. The thin wall portion is formed with a smaller thickness in the radial direction of the lens barrel than the cam follower base portion.

  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 1 is an exploded perspective view of a lens barrel according to an embodiment. FIG. 3 is a main part configuration diagram of a third group unit of a lens barrel according to an embodiment. 4 is an exploded perspective view of a fourth group unit of the lens barrel according to the embodiment. FIG. Configuration diagram of main parts of a lens barrel according to an embodiment Exploded perspective view of the third group unit, the fourth group unit and the cam frame of the lens barrel according to the embodiment 3 is a main part configuration diagram of a third group unit, a fourth group unit, and a cam frame of a lens barrel according to an 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 drawing in each state of the lens barrel according to the embodiment 1 is 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. The figure for demonstrating the 1st group main cam groove of the cam frame which concerns on embodiment, 1st group auxiliary cam groove, and 2nd group cam groove Exploded perspective view of a master flange unit and an image sensor unit according to an embodiment Cross-sectional schematic diagram of relevant parts of a master flange unit and an image sensor unit according to an embodiment

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

  In addition, the inventors provide the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and these are intended to limit the subject matter described in the claims. is not.

  Embodiments of the present disclosure will be described with reference to 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 the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Of course, the drawings may include portions having different dimensional relationships and ratios.

  In the following embodiments, a digital camera will be described as an example of an imaging device. In the following description, with the digital camera in the horizontal position as a reference, the subject side is “front side”, the opposite side (image side) of the subject is “rear side”, the vertical upper side is “upper side”, and the vertical lower side is “lower side” The right side of the lens barrel viewed from the subject side is expressed as “right side”, and the left side of the lens barrel viewed from the subject side is expressed as “left side”. The horizontal position is a kind of posture of the digital camera. When shooting 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. 2A, the lens barrel 2000 in the retracted state, FIG. 2B, the lens barrel 2000 at the time of shooting (wide state), and FIG. 2C, at the time of shooting (tele state). A lens barrel 2000 is shown. 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 includes a retractable zoom mechanism. As shown in FIG. 2, the lens barrel 2000 has the shortest overall length in the retracted state, and conversely has the longest overall length in the telephoto state.

[2. Lens barrel configuration]
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. A one-dot chain line indicates the optical axis AX. In this chapter and FIG. 3, since the schematic configuration of the lens barrel is described, the reference numerals in the text and 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, the direction parallel to the optical axis AX is “optical axis direction”, the direction perpendicular to the optical axis direction is “radial direction”, and the direction along the circle centered on the optical axis AX is “circumferential direction”. ". The optical axis AX substantially coincides with the axis of each frame constituting the lens barrel 2000.

  As shown in FIG. 3, the lens barrel 2000 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 image sensor 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. A 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 near the optical axis AX. A part of the image sensor 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. Accordingly, the first group rectilinear frame 2020 is held so as not to be rotatable relative to the fixed frame unit 2010 and to be 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 group 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. Accordingly, the first group unit 2030 is held so as not to be rotatable relative to the first group rectilinear frame 2020 and to be movable back and forth in the optical axis direction. The rotation restricting groove of the first group unit 2030 is formed along the optical axis direction on the inner peripheral surface of the first group unit 2030.

  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 the subject image. The second group unit 2040 is formed in a disc shape and is disposed inside the first group unit 2030. The second group unit 2040 has a rotation restricting portion 2041 extending rearward in the optical axis direction from the outer peripheral surface, and a cam follower 2042 protruding toward 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. Accordingly, the second group unit 2040 is held so as not to be rotatable 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 for zooming for changing the angle of view of the subject image and for correcting image blur due to a user's camera shake or the like. The third group unit 2050 is formed in a cylindrical shape and is disposed inside the cam frame 2070. The third group unit 2050 includes 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 on 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. Accordingly, the third group unit 2050 is held so as not to be rotatable 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 for zooming to change the angle of view of the subject image. The fourth group unit 2060 is formed in a disc shape, and is disposed inside the third group unit 2050. The fourth group unit 2060 includes a rotation restricting portion that protrudes radially outward, and a cam follower that protrudes further radially outward from the rotation restricting portion. The rotation restricting portion is engaged with the rotation restricting slit of the third group unit 2050. Accordingly, the fourth group unit 2060 is held so as not to be rotatable 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 configured with a shutter unit 2065 for controlling the amount of light reaching the image sensor.

  The fifth group unit 2090 holds the fifth lens group G5 (see FIG. 12C). The fifth lens group G5 is a lens group used during zooming for changing the angle of view of the subject image. The fifth group unit 2090 is formed in a disc shape, and is disposed inside the third group unit 2050. The fifth group unit 2090 has a rotation restricting portion that protrudes radially outward, and a cam follower that protrudes further radially outward from the rotation restricting portion. The rotation restricting portion is associated with the rotation restricting slit of the third group unit. Combined. Accordingly, the fourth group unit 2060 is held so as not to be rotatable 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 for focusing for adjusting the in-focus state of the 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 that protrudes further outward in the radial direction from the flange portion. The rotation restricting protrusion is engaged with a rotation restricting groove on 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 move back and forth in the optical axis direction. A focus motor is fixed to the sixth group moving unit 2110, and the relative position in the optical axis direction of the sixth group moving unit 2110 and the sixth group unit 2100 can be adjusted by driving the motor. The sixth group moving unit 2110 has a cam follower that protrudes radially outward near 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 peripheral surface and the outer peripheral surface, and has a cam follower and a driven gear portion near the rear end of the outer peripheral surface. The cam follower is engaged with the cam groove on 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 give 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.

  Cam followers of the first group unit 2030 and the second group unit 2040 are engaged with the cam grooves on the outer peripheral surface of the cam frame 2070, respectively, and the third group unit 2050 and the fourth group are respectively inserted into the cam grooves on the inner peripheral surface of the cam frame 2070. 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 to give a driving force, the first group unit 2030, the second group unit 2040, the third group unit 2050, the fourth group unit 2060, the fifth group unit 2090, and the sixth group movement unit 2110 are fixed frames. It does not rotate relative to the unit 2010 and moves back and forth in the optical axis direction.

  In the configuration described above, the lens barrel 2000 drives the zoom motor unit 2130 and the focus motor, thereby arranging the first lens group G1 to the sixth lens group G6 at appropriate positions, and performing zooming and focusing. Is possible.

[3. Detailed configuration of members constituting the lens barrel]
[2. In “Configuration of Lens Barrel”, the outline of each member constituting the lens barrel 2000 has been described. Below, the detail of each component which comprises the lens-barrel 2000 is demonstrated.

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

  FIG. 4 is a main part configuration diagram of the third group unit 2050. FIG. 4A is a view of the third unit 2050 as viewed from the front side in the optical axis direction. FIG. 4B is a view of the third unit 2050 as viewed from the outside in the radial direction. FIG.4 (c) is sectional drawing in the AA line in FIG.4 (b). FIG.4 (d) is sectional drawing in the BB line in FIG.4 (b). FIG. 4E is a cross-sectional view taken along line CC in FIG.

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

  Moreover, the thin part 2052 is arrange | positioned in the position away from each other. More specifically, the two thin-walled portions 2052 are disposed at two locations 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 arranged 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 is not easily 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 locations), there are a plurality of supporting points when the cam follower base portion 2053 swings. As a result, the thin portion 2052 is disposed only in one place, and the thin portion 2052 is less likely to twist as compared with the case where the cam follower base portion 2053 has only one fulcrum. This is because a plurality of fulcrums regulate twisting with each other. Further, when the thin portion 2052 is disposed at a position away from each other, in order to twist the thin portion 2052 in the circumferential direction or the optical axis direction, compared with the case where the thin portion 2052 is disposed at only one place, This is because great power is required.

  Further, as shown in FIG. 4E, the cam follower base portion 2053 has a front end portion 2053a opposite to the thin portion 2052 in the optical axis direction facing a base portion facing portion 2057b which is a part of the main body portion 2057. ing. The base portion facing portion 2057b is located on the radially inner side of the cam follower base portion 2053. A gap is provided in the radial direction between the front end portion 2052a of the cam follower base portion 2053 and the base portion facing portion 2057b of the main body portion 2057. Further, the base portion facing portion 2057b of the main body portion 2057 is provided with a regulating projection 2054 at a position facing the front end portion 2053a of the cam follower base portion 2053 and on the side opposite to the cam follower 2051 with the cam follower base portion 2053 interposed therebetween. ing. With this 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 way, 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 comes into contact with the restricting protrusion 2054 and is not displaced further. By restricting the amount of displacement of the cam follower base portion 2053, the cam follower 2051 is prevented from dropping from the cam groove when an external force such as a drop impact is applied to the lens barrel, thereby improving the reliability of the lens barrel 2000. I can do it.

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

  FIG. 5 is an exploded perspective view of the fourth group unit 2060. 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 plate spring 2063 is held by screws 2062 in the fourth group frame 2064. The leaf spring 2063 is disposed at a position facing the cam follower base portion 2053.

  On the front side in the optical axis direction of the fourth group frame 2064, a light shielding sheet 2061 for preventing unnecessary light from entering the fourth lens group G4 is disposed.

  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 on the fourth group frame 2064. To do.

[3-3.3 group unit + 4 group unit + cam frame]
Next, a configuration in a state where 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 configuration diagram of a main part of the lens barrel 2000. 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 side in the optical axis direction. FIG. 6B is a cross-sectional view taken along the line DD in FIG.

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

  In the third group unit 2050, the cam follower base portion 2053 is displaced outward in the radial direction, so that 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 enters a tapered portion of the cam groove 2072.

  Therefore, the play 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 uses the single plate spring 2063 to hold the two of the third group unit 2050 and the fourth group unit 2060 on the cam frame 2070 in a state of being biased with respect to the cam frame 2070. I can do it. Therefore, the lens barrel 2000 has a high holding accuracy for the third lens group G3 and the fourth lens group G4. 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, three alignment holes 2055 are provided on the outer peripheral surface of the third group unit 2050 (only two places appear in FIG. 7A). The cam frame 2070 is provided with a notch 2071 on the circumference on the front side in 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 is engaged with the hook portion 20651 and the hook holding portion 20641 described above. Integrated. The third group unit 2050 is held so as to be movable 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 alignment hole 2055 and the notch 2071 face each other, and one through-hole is formed. It is formed.

  FIG. 8 is a main part configuration diagram 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 the shutter unit is inserted).

  As shown in FIG. 8, a jig is inserted from the alignment hole 2055 of the third group unit 2050 to adjust the position of the fourth lens group G4 with respect to the third lens group G3, and the fourth lens group on the fourth group frame 2064. G4 can be bonded and fixed. Accordingly, 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 the present embodiment has a configuration in which the alignment hole 2055 and the notch 2071 face each other when the third group unit 2050 is extended most with respect to the cam frame 2070. With this configuration, a through-hole can be formed when aligning the fourth lens group G4, but the through-hole is not formed at other zoom positions used for shooting so that light leakage does not occur. It is configured.

  As described above, since the lens barrel 2000 can improve the relative positional 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 the amount of margin in accuracy in the inter-group adjustment of the third lens group G3 and the fourth lens group G4 to the miniaturization of the lens barrel. And weight reduction can be achieved.

  In the present embodiment, the configuration in which the plate spring 2063 is fixed to the fourth group unit 2060 as the urging member is shown. However, the urging means other than the plate spring such as a coil spring provided with the plate spring in the third group unit 2050 is shown. Needless to say, a configuration such as energization is possible. Further, the third group unit 2050 may be made of a material such as a metal and directly biased by the spring property of the thin portion 2052.

[4. Detailed configuration of flexible printed circuit board]
[4-1. FPC guide frame]
In the following, referring to FIGS. 9 to 12, a mirror of a flexible substrate (OIS flex 2056, shutter flex 2066) for connecting the shake correction unit and shutter unit 2065 to the main body substrate, which is built in the lens barrel 2000. The routing inside the cylinder will be described.

  9 is an exploded perspective view showing a mounted state of the FPC guide frame 2080, FIG. 10 is a three-side view of the FPC guide frame 2080, and FIG. 11 is an inner surface development 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 protrusion 2083 slides inside the guide wall 2111 and the FPC guide frame 2080 moves in the optical axis direction.

  10A is a view of the FPC guide frame 2080 viewed from the front side in the optical axis direction. FIG. 10B 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 as seen from the vertical direction perpendicular to the optical axis AX. As shown in FIG. 10, the FPC guide frame 2080 includes a rectilinear guide protrusion 2083, a cam follower a 2081, and a cam follower b 2082. As shown in FIG. 10B, the FPC guide frame 2080 is formed in an L shape when viewed from the horizontal direction perpendicular to the optical axis AX.

  The rectilinear guide protrusion 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 follower a 2081 and the cam follower b 2082 are engaged with the cam groove 81 and the cam groove 82 on the inner peripheral surface of the cam frame 2070, respectively.

  In FIG. 11, the section X of the cam groove 81 is divided by another cam groove. Further, the cam groove 82 has the section Y divided by another cam groove, and the rear end side protrudes from the cam frame 2070.

  However, since the cam follower a 2081 and the cam follower b 2082 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 a 2081 and the cam follower b 2082 is always the cam groove 81 and the cam groove 82. So that it can be continuously driven.

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

  Thus, the FPC guide frame 2080 can move back and forth in the optical axis direction independently of other units as the cam frame 2070 rotates.

  FIG. 12 is a cross-sectional view of the lens barrel 2000 in each state.

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

  As shown in FIGS. 12A to 12C, 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 barrel Connected to 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 extends from the rear end of the cam frame 2070 in the optical axis direction. Move to the back.

  In FIGS. 12A to 12C, the FPC guide frame 2080 moves back and forth in the optical axis direction, so that the sag amount of the OIS flex 2056 hardly changes even in each state of the lens barrel 2000. With such a configuration, the FPC guide frame 2080 suppresses the slack OIS flex 2056 from being caught by other parts or being sandwiched between other frames.

  As described above, by appropriately setting the cam groove 81 and the cam groove 82 of the cam frame 2070, the amount of sag of the OIS flex 2056 can be controlled.

  On the other hand, the state of the shutter flex 2066 is different from that of the OIS flex 2056.

  In FIG. 12A to FIG. 12C, the shutter flex 2066 is overlapped at the same place as the OIS flex 2056 and pulled 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 when the lens barrel is extended, there is no problem because the amount of sag is constant, but in the case of the present embodiment, the third group unit is accompanied by zooming. The gap t between 2050 and the fourth group unit 2060 changes.

  In 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 retracted state and the wide state, but the gap t between 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 flex 2066. The reinforcing plate 2067 is made of a material harder than the shutter flex 2066. The portion of the shutter flex 2066 where the reinforcing plate 2067 is provided is limited in bending by the reinforcing plate 2067. In FIG. 12C, the shutter flex 2066 is bent at the rear side in the optical axis direction as compared with the OIS flex 2056 because the flexure is limited by the reinforcing plate 2067.

  Accordingly, it is possible to control the amount of slack of the shutter flex 2066, and it is possible to prevent the shutter flex 2066 from being caught by another portion or being sandwiched between other frames.

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

  In this embodiment, the reinforcement plate 2067 is provided on the shutter flex 2066 to limit the bending, but the width of the shutter flex 2066 may be partially enlarged so that the shutter flex 2066 is not easily bent. In addition, the bending may be limited by hooking a portion where the width of the shutter flex 2066 is widened to another frame.

[Detailed Configuration of First Group Unit, Second Group Unit Drive Unit]
The configuration of the drive unit of the first group unit 2030 and the second group unit 2040 will be described below.

[5-1.1 Group Unit, 2 Unit Drive Unit Configuration]
FIG. 13 is an exploded perspective view showing the configuration of the 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 the inner peripheral surface (only one appears in FIG. 13). The first group unit 2030 has two auxiliary cam followers 2032 having a smaller cross-sectional area and a smaller radial protrusion than the main cam follower 2031 on the inner peripheral surface (only one appears in FIG. 13). Further, the first group unit 2030 has a rotation restricting groove 2033 formed on the inner peripheral surface along the optical axis direction.

  The second group unit 2040 has a rotation restricting portion 2041 extending from the outer peripheral edge to the rear side in the optical axis direction, and a cam follower 2042 is provided inside the vicinity of 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 so as to be movable 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 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 in the rotation restricting groove 2033 of the first group unit 2030 without protruding radially inward from the inner surface of the first group unit 2030. Accordingly, the lens barrel 2000 has a first group main cam groove 31 and a first group auxiliary cam groove 32 for the first group unit 2030 and a second group unit 2040 on the outer peripheral surface of the cam frame 2070 without increasing the radial thickness. The second group cam groove 42 can be disposed 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. 14A is a development of the outer peripheral surface of the cam frame 2070, FIG. 14B is a sectional view of the first group auxiliary cam groove 32, and FIG. 14C is a sectional view of the second group cam groove 42.

  In FIG. 14A, the cam frame 2070 has eight cam grooves on the outer peripheral surface, with 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.

  14B and 14C, the second group cam groove 42 is formed deeper than the first group auxiliary cam groove 32, and the cam follower 2042 is slidable at a deep portion of the second group cam groove 42. It is in a held state.

  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 is dropped.

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

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

  Further, the second group cam groove 42 has a shallower depth of the sliding surface of the cam follower 2042 at the portion intersecting with the first group auxiliary cam groove 32, but the second group unit 2040 is smaller than the first group unit 2030. Because it only adds power, it is difficult to come off.

  As described above, by forming 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 first group units 2030 and 2 are not increased without increasing the diameter of the lens barrel 2000. 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 of arranging the cam groove on the inner peripheral surface of the cam frame 2070 increases. With such a configuration, the lens barrel 2000 can drive more units independently, and can form more cam grooves within a limited dimension in the optical axis direction. The dimension of the cylinder 2000 in the optical axis direction can be reduced.

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

[6. Dust-proof configuration of image sensor fixing part]
Below, the dust-proof structure of an image sensor fixing | fixed part is demonstrated using FIG.15 and FIG.16.

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

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

  The master flange 2142 is formed with an opening 2142 a larger than the image sensor 2151.

  A dustproof sheet 2141 in which an opening 2141 a having substantially the same size as that of the image sensor 2151 is attached to the inner diameter portion of the master flange 2142.

  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 diagram showing a cross section when the master flange unit 2140 and the image sensor unit 2150 are combined.

  Since the opening 2141a of the dustproof sheet 2141 is made slightly smaller than the image sensor 2151, the edge of the opening 2141a is in contact with the outer periphery of the image sensor 2151. With this configuration, the outer periphery of the image sensor 2151 is pressed by the dustproof sheet 2141.

  With this configuration, the dustproof sheet 2141 shields the space inside the lens barrel and the space outside the image pickup device 2151, and it is difficult for foreign matters such as dust and dust to occur inside the lens barrel. Further, excessive light from the vicinity of the image sensor 2151 is prevented from being reflected in the image.

[7. Other Embodiments]
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like. Moreover, it is also possible to combine each component demonstrated in the said embodiment and it can also be set as a new embodiment.

  Therefore, other embodiments will be exemplified below.

  In the embodiment, the thin portion 2052 that connects the cam follower base portion 2053 and the main body portion 2057 of the third group unit 2050 is arranged at positions separated from each other in the circumferential direction around the optical axis AX. The present disclosure is not limited to this. It is good also as what is arrange | positioned in the position which mutually separated in the direction along optical axis AX.

  In the embodiment, two thin portions 2052 are present, but the present disclosure is not limited to this. Any number of thin portions may be used.

  In the embodiment, the cam follower 2051 is disposed on the radially outer side of the cam follower base portion 2053, but the present disclosure is not limited thereto. The cam follower may be configured such that the cam follower is present inside the cam follower base portion in the radial direction and the cam groove is located further inside.

  In the embodiment, the cam follower base portion 2053 is biased by a leaf 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.

  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. However, the present disclosure is not limited to this. It is also possible to replace the alignment holes and the cutouts as appropriate, or 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 alignment hole 2055 and the notch 2071 face each other to form one through hole. However, the present disclosure is not limited to this. The alignment hole and the notch may be opposed to each other in the middle of the zoom section to form one through hole.

[Appendix 1]
A first moving group (for example, a third lens group G3);
A second movement group (for example, a fourth lens group G4) that includes at least one lens, different from the first movement group;
A first frame (for example, a third group unit 2050) that holds the first moving group;
A second frame (e.g., a fourth group unit 2060) disposed inside the first frame and holding a lens in the second moving group;
A third frame (e.g., a cam frame 2070) disposed outside the first frame and holding the first frame movably in the optical axis direction,
The first frame has at least one hole (for example, alignment hole 2055) formed on the outer peripheral surface,
The third frame body has at least one hole or notch (for example, a notch 2071) formed on the outer peripheral surface,
When the first frame is driven to a predetermined position within a driveable range with respect to the third frame, a hole in the first frame and a hole or notch in the third frame Facing each other,
Lens barrel (for example, lens barrel 2000).

[Appendix 2]
A lens barrel (e.g., lens barrel 2000) holding at least one lens,
A fixed frame (for example, fixed frame unit 2010);
A drive frame (for example, a third group unit 2050, a 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 electrical components;
A flexible substrate (for example, OIS flexible 2056, shutter flexible 2066) having one end connected to the moving unit;
An FPC guide frame (for example, an FPC guide frame 2080) that moves in the optical axis direction independently of the moving unit and guides the flexible substrate;
A lens barrel comprising:

[Appendix 3]
A lens barrel (e.g., lens barrel 2000) holding at least one lens,
A fixed frame (for example, fixed frame unit 2010);
A first moving unit and a second moving unit, which are movable in the optical axis direction with respect to the fixed frame and include electrical components;
A first flexible substrate (for example, OIS flex 2056) having one end connected to the first moving unit and the other end fixed to the fixed frame;
A second flexible substrate (for example, 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 restriction portion (for example, a reinforcing plate 2067) that restricts bending of a partial region of the second flexible substrate.
Lens barrel (for example, lens barrel 2000).

[Appendix 4]
A first frame (e.g., cam frame 2070) formed in a substantially cylindrical shape;
A first lens group (for example, the first lens group G1) having at least one lens and a second lens group (for example, the second lens group) that can move in the optical axis direction in order from the subject side to the image plane side. G2)
A second frame (for example, a first group unit 2030) and a third frame (for example, a second group unit 2040) that respectively hold the first lens group and the second lens group;
The second frame includes a first cam follower (for example, a main cam follower 2031) that can be engaged with the first frame, and a second cam follower (for example, an auxiliary cam follower 2032). The frame has a third cam follower (for example, a cam follower 2042) that can be engaged with the first frame.
The first frame body has a first cam groove (for example, a first group main cam groove 31) and a third cam groove (for example, a second group cam groove) that are engageable with the first cam follower and the third cam follower on an 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, the first group auxiliary cam groove 32) that can be engaged with the second cam follower is formed, and the second cam groove and the third cam groove The cam groove is partially crossed,
Lens barrel.

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

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

2000 Lens barrel 2010 Fixed frame unit 2020 Group 1 rectilinear frame 2030 Group 1 unit 2031 Main cam follower 2032 Auxiliary cam follower 2033 Rotation restriction groove 2040 Group 2 unit 2041 Rotation restriction unit 2042 Cam follower 2050 Group 3 unit (first frame)
2051 Cam follower 2052 Thin wall portion 2053 Cam follower base portion 2054 Restriction protrusion 2055 Alignment hole 2056 OIS flexible (flexible substrate)
2057 Main body portion 2060 4th group unit (third frame)
2061 Light-shielding sheet 2062 Screw 2063 Leaf spring (biasing member)
2064 4th group frame 20641 Hook holding part 2065 Shutter unit 20651 Hook part 2066 Shutter flexible (flexible substrate)
2067 Reinforcing plate 2070 Cam frame (second frame)
2071 Notch 2072 Cam groove 2080 FPC guide frame 2081 Cam follower a
2082 Cam follower b
2083 Straight guide protrusion 2090 5th group unit 2100 6th group unit 2110 6th group moving unit 2111 Guide wall 2120 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 Housing AX Optical axis G3 Third lens group G4 Fourth lens group

Claims (6)

A lens barrel capable of moving the lens in a direction parallel to the optical axis,
A first frame having a cam follower and a cam follower base portion for holding the cam follower;
A second frame having a cam groove engageable with the cam follower;
With
The first frame and the second frame move relative to each other along the optical axis,
The cam follower base portion has one end connected to the main body portion of the first frame body through at least one thin portion, while the other end is not connected to the main body portion,
The thin-walled portion is a lens barrel in which the thickness of the lens barrel in the radial direction is thinner than that of the cam follower base portion. The cam follower base portion is connected to the first frame body via a plurality of the thin portions disposed at positions separated from each other.
The lens barrel according to claim 1. A biasing member is further provided at a position facing the cam follower base portion,
The biasing member biases the cam follower toward the cam groove;
The lens barrel according to claim 1. A third frame that is held at a position facing the cam follower base;
The biasing member is held by the third frame;
The lens barrel according to claim 3. In the main body portion of the first frame,
A restricting projection is provided at a position facing the cam follower base portion and on the opposite side of the cam follower with the cam follower base portion interposed therebetween.
The lens barrel according to claim 1. The lens barrel according to claim 1, wherein the thin portion is formed to have a shorter length in a direction parallel to the optical axis than the cam follower base portion.

Images