WO2013069310A1 - Lens barrel - Google Patents

Lens barrel Download PDF

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Publication number
WO2013069310A1
WO2013069310A1 PCT/JP2012/007246 JP2012007246W WO2013069310A1 WO 2013069310 A1 WO2013069310 A1 WO 2013069310A1 JP 2012007246 W JP2012007246 W JP 2012007246W WO 2013069310 A1 WO2013069310 A1 WO 2013069310A1
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WO
WIPO (PCT)
Prior art keywords
cam
frame
cam follower
lens barrel
axis direction
Prior art date
Application number
PCT/JP2012/007246
Other languages
French (fr)
Japanese (ja)
Inventor
広康 藤中
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013069310A1 publication Critical patent/WO2013069310A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism

Definitions

  • the technology disclosed herein relates to a lens barrel used in an imaging apparatus.
  • a cam frame is rotationally driven by a drive mechanism.
  • the drive mechanism has a drive gear
  • the cam frame has a driven gear portion that is engaged with the drive gear.
  • the cam frame is held by a fixed frame.
  • the fixed frame has a guide protrusion
  • the cam frame has a guide groove to be engaged with the guide protrusion.
  • the technology disclosed herein provides a lens barrel that can be reduced in size in the optical axis direction even when the driven gear portion provided on the cam frame and the guide groove are arranged in an overlapping manner. The purpose is to do.
  • a lens barrel according to the technology disclosed herein includes a substantially cylindrical fixed frame, a substantially cylindrical moving frame disposed on the inner periphery of the fixed frame, and a fixed frame. And a drive mechanism that rotationally drives the moving frame.
  • the fixed frame has a plurality of guide protrusions on the inner peripheral surface for guiding the moving frame in the direction of the rotation axis as the moving frame rotates.
  • the drive mechanism has a plurality of drive gears.
  • the moving frame has a driven gear portion that meshes with the plurality of drive gears, and a guide groove that meshes with the guide protrusion but does not mesh with the plurality of drive gears on the outer periphery.
  • the driven gear portion includes a missing tooth portion that is provided at a position overlapping the guide groove portion and does not have a portion that meshes with the guide protrusion.
  • the drive mechanism is configured such that at least one drive gear of the plurality of drive gears meshes with the driven gear portion when in use. (The invention's effect) According to the above configuration, in the lens barrel in which the driven gear portion provided on the cam frame and the guide groove are overlapped with each other, the rotation of the moving frame is avoided and the size in the optical axis direction is avoided. A small lens barrel can be provided.
  • FIG. 1 is an exploded perspective view of a lens barrel according to Embodiment 1.
  • FIG. 2 is a development view of an outer peripheral surface of a cam frame included in the lens barrel of FIG. 1.
  • the figure which shows the engagement relationship of the cam frame and drive gear which are contained in the lens barrel of FIG. (A-1) to (b-2) are diagrams showing a relationship between a cam and a cam follower included in the lens barrel of FIG. (A),
  • (b) is a figure which shows the engagement relationship of the cam and cam follower which are contained in the lens-barrel of FIG.
  • (A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on a comparative example, and a cam follower.
  • (A), (b) is a figure which shows the engagement relation of the cam which concerns on a comparative example, and a cam follower.
  • (A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on Embodiment 2, and a cam follower.
  • (A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on Embodiment 3, and a cam follower.
  • (A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on Embodiment 4, and a cam follower.
  • FIG. 1 is an exploded perspective view of a lens barrel 100 according to the present embodiment.
  • the lens barrel 100 is mounted on a device having a camera function such as a digital still camera.
  • the lens barrel 100 includes an optical system having various lenses such as a zoom lens and a focus lens therein.
  • the optical system of the lens barrel 100 forms incident light on the image sensor.
  • the image sensor converts incident light into an electrical signal.
  • the lens barrel 100 is an example of the technology disclosed herein, and can be mounted not only on a digital still camera but also on a video camera or the like.
  • a first group frame (moving frame) 10 a second group frame 20
  • a fixed frame 30 a drive mechanism 70
  • a rectilinear frame 40 a cam frame 50
  • a master flange 60 a master flange 60
  • the fixed frame 30 holds the rectilinear frame 40 and the cam frame 50 inside.
  • the rectilinear frame 40 holds the first group frame 10 so as to be linearly movable.
  • the first group frame 10 is engaged with an internal cam frame 50 by a cam mechanism.
  • the first group frame 10 holds the second group frame 20 therein.
  • the optical system of the lens barrel 100 is configured by the above configuration.
  • the fixed frame 30 is fixed to the master flange 60 provided with the image pick-up element.
  • the first group frame 10 is a cylindrical frame that holds a lens arranged closest to the subject.
  • the first group frame 10 advances and retreats in the optical axis direction with respect to the rectilinear frame 40.
  • the first group frame 10 has a rectilinear protrusion that protrudes in the outer diameter direction.
  • the first group frame 10 is held in the rectilinear frame 40 so as not to rotate relative to the rectilinear frame 40 by engaging the rectilinear protrusions with rectilinear grooves provided on the inner peripheral surface of the rectilinear frame 40.
  • the first group frame 10 is provided with three cam followers 11 (see FIG. 5B-1 and the like) on the inner peripheral surface.
  • the cam follower 11 is engaged with a cam 53 provided on the outer peripheral surface of the cam frame 50.
  • the second group frame 20 holds a lens therein.
  • the second group frame 20 is held in the first group frame 10.
  • the second group frame 20 is also advanced and retracted in the optical axis direction by the same mechanism as the first group frame 10.
  • the fixed frame 30 holds the rectilinear frame 40 on the inner peripheral surface so as to be able to move straight.
  • a rectilinear groove is provided on the inner peripheral surface of the fixed frame 30.
  • the fixed frame 30 holds the cam frame 50 in a rotatable manner.
  • a spiral guide projection 31 is provided on the inner peripheral surface of the fixed frame 30. By engaging the guide protrusion 31 with a guide groove 51 provided on the outer peripheral surface of the cam frame 50, the cam frame 50 can be rotated with respect to the fixed frame 30.
  • the fixed frame 30 is provided with an opening 34 in which a part of the outer peripheral surface is cut out.
  • a drive mechanism 70 is disposed on the outer peripheral surface side of the fixed frame 30. The drive mechanism 70 drives the cam frame 50 to rotate.
  • the drive mechanism 70 has a connection gear 71 connected to a motor and two drive gears 72.
  • the two drive gears 72 are engaged with the cam frame 50 inside the fixed frame 30 through the opening 34.
  • the two drive gears 72 are respectively engaged with a connection gear 71 provided on the outer side.
  • the connection gear 71 is rotationally driven by a motor. Since the connecting gear 71 meshes with each of the two drive gears 72, the cam frame 50 is rotationally driven by the three gears rotating together.
  • the rectilinear frame 40 is held in the fixed frame 30 so as to be linearly movable in the optical axis direction.
  • the rectilinear frame 40 holds the first group frame 10 so as to be linearly movable in the optical axis direction with respect to the rectilinear frame 40 and not to rotate relative to the fixed frame 30.
  • the rectilinear frame 40 is bayonet-coupled to the outer periphery of the cam frame 50, and holds the cam frame 50 rotatably. Therefore, the rectilinear frame 40 moves forward and backward in the optical axis direction together with the cam frame 50. That is, the rectilinear frame 40 is held by the fixed frame 30 so as to be relatively rotatable with respect to the cam frame 50 and not to advance or retreat in the optical axis direction with respect to the cam frame 50.
  • cams 53 are formed on the outer peripheral surface of the cam frame 50.
  • the cam 53 is engaged with three cam followers 11 (see FIG. 5B-1 etc.) provided on the inner peripheral surface of the first group frame.
  • a driven gear portion 52 that meshes with the two drive gears 72 is provided outside the cam frame 50.
  • the cam frame 50 is rotationally driven by the rotation of the drive gear 72.
  • a guide groove 51 that is engaged with the guide protrusion 31 on the fixed frame 30 side is provided on the outer peripheral surface of the cam frame 50.
  • the guide protrusion 31 is provided on the inner peripheral surface of the fixed frame 30 in a spiral shape.
  • the first group frame 10, the second group frame 20, the fixed frame 30, the rectilinear frame 40, the cam frame 50, and the master flange 60 are assembled to constitute the optical system of the first group frame 10 lens barrel 100. Is done.
  • the image sensor and the fixed frame 30 are fixed to the master flange 60. As a result, the light passing through the optical system of the lens barrel 100 is imaged on the image sensor fixed to the master flange 60.
  • the guide protrusion 31 provided on the fixed frame 30 and the cam 53 provided on the cam frame 50 are designed so as to be at appropriate positions with respect to the rotation angle of the cam frame 50. Therefore, the lens fixed to the first group frame 10 is disposed at a predetermined position with respect to the rotation angle of the cam frame 50. Thereby, the lens barrel 100 can change the focal length of the optical system in the shooting state, or can house the optical system in the non-shooting state.
  • FIG. 2 is a development view of the inner peripheral surface of the fixed frame 30 of the present embodiment.
  • the hatched area protrudes in the inner diameter direction from the other areas.
  • a plurality of guide protrusions 31 are provided on the inner peripheral surface of the fixed frame 30.
  • the plurality of guide protrusions 31 protrude in the inner diameter direction.
  • a plurality of spiral guide protrusions 31 are formed on the inner peripheral surface of the fixed frame 30.
  • the fixed frame 30 has an opening 34 penetrating in the radial direction.
  • a drive gear 72 and a connection gear 71 are disposed outside the opening 34 of the fixed frame 30.
  • FIG. 3 is a development view of the outer peripheral surface of the cam frame 50 of the present embodiment. In FIG. 3, the hatched area is projected in the outer diameter direction from the other areas.
  • a driven gear portion 52 is provided on the outer peripheral surface of the cam frame 50.
  • the driven gear portion 52 protrudes in the outer diameter direction and meshes with the driving gear 72.
  • a plurality of guide grooves 51 are spirally provided on the outer peripheral portion of the cam frame 50.
  • the plurality of guide grooves 51 are engaged with the plurality of guide protrusions 31 on the fixed frame 30 side. At least one of the plurality of guide grooves 51 is disposed so as to overlap the driven gear portion 52. Therefore, the portion of the driven gear portion 52 where the guide groove 51 is provided is a missing tooth portion 52a with missing teeth.
  • the cam frame 50 is rotated with respect to the fixed frame 30 in a state where the cam frame 50 is inserted on the inner peripheral side of the fixed frame 30, the guide protrusion 31 of the fixed frame 30 and the guide groove 51 of the cam frame 50 Are engaged, and the cam frame 50 is guided in the optical axis direction.
  • the cam frame 50 is rotationally driven by the engagement of the drive gear 72 and the driven gear portion 52.
  • the drive gear 72 overlaps the toothless portion 52a, the drive gear 72 and the driven gear portion 52 do not mesh with each other, and the drive gear 72 is idle.
  • a method of increasing the length T (see FIG. 3) of the driven gear portion 52 in the optical axis direction is used. That is, when the length T of the driven gear portion 52 in the optical axis direction is increased, the guide groove 51 is inclined with respect to the optical axis direction even if the driven gear portion 52 has the missing tooth portion 52a.
  • the drive gear 72 and the driven gear portion 52 mesh with each other in any part of the region in the axial direction.
  • a plurality of drive gears 72 are provided, and at least one of the plurality of drive gears 72 is always in mesh with the driven gear portion 52 in use. Has been.
  • FIG. 4 is a diagram illustrating an engagement relationship between the cam frame 50 and the drive gear 72 according to the present embodiment.
  • the drive gear 72 of this embodiment has the 1st drive gear 72a and the 2nd drive gear 72b, as shown in FIG.
  • the first drive gear 72a and the second drive gear 72b mesh with the driven gear portion 52, respectively.
  • the first drive gear 72a and the second drive gear 72b mesh with the connection gear 71, respectively.
  • the length T of the driven gear portion 52 in the optical axis direction is shortened, it can be driven without any problem.
  • the amount of stroke of the cam frame can be increased as compared with the conventional lens barrel.
  • the length of the fixed frame 30 in the optical axis direction is shortened within a range in which a necessary stroke amount can be secured, the length of the lens barrel 100 in the optical axis direction when the lens barrel is housed can be reduced. it can.
  • a configuration in which two drive gears 72 are provided is shown, but a configuration including three or more drive gears may be used.
  • the single connecting gear 71 meshes with the first and second driving gears 72a and 72b, and the first and second driving gears 72a are rotated by rotating the connecting gear 71.
  • 72b has been described as being rotationally driven, but is not limited thereto.
  • one connection gear may be provided for each of the plurality of drive gears, and the plurality of drive gears may be rotationally driven by the plurality of connection gears.
  • the number of parts in the lens barrel 100 can be simplified by rotationally driving the plurality of first and second drive gears 72a and 72b with a single connecting gear 71 as in the present embodiment.
  • a configuration in which two identical drive gears 72 are arranged is shown.
  • the length, outer diameter, or number of teeth of the first drive gear 72a and the second drive gear 72b in the optical axis direction are shown. They may be different and may be selected appropriately according to the design.
  • FIGS. 5 (a-1) to 5 (b-2) are diagrams showing the cam 53 and the cam follower 11 of this embodiment.
  • FIG. 5 (a-1) is a developed view of the outer peripheral surface of the cam frame 50
  • FIG. 5 (a-2) is a cross-sectional view taken along the line AA in (a-1) (hereinafter referred to as FIG. 5).
  • FIG. 7 FIG. 9, FIG. 10
  • FIG. 5 (b-1) is a development view of the inner peripheral surface of the first group frame 10
  • FIG. 5 (b-2) is a cross-sectional view taken along the line BB in (b-1) (hereinafter, FIG. 7, FIG.
  • FIG. 7, FIG. The same applies to 9, 10, and 11.
  • FIG. 6A and FIG. 6B are diagrams showing the engagement relationship between the cam 53 and the cam follower 11 of this embodiment.
  • 6A is a cross-sectional view showing an engagement state between the cam 53 and the cam follower 11 in a normal state
  • FIG. 6B shows an engagement state between the cam 53 and the cam follower 11 when an external force F is applied.
  • FIG. 8 is a cross-sectional view (the same applies to FIG. 8).
  • the cam frame 50 of the present embodiment includes a cam 53 that is engaged with the cam follower 11 as shown in FIGS. 5 (a-1) and 5 (a-2).
  • the cam 53 includes a first cam 53a having a shallow groove and a wide groove, and a second cam 53b having a groove that is narrower than the first cam 53a.
  • the second cam 53b is disposed at a position overlapping the first cam 53a, and is formed from the bottom surface of the first cam 53a (the surface along the vertical direction in FIG. 5 (a-2)) to a deeper position. Yes.
  • the center line BX of the second cam 53b is provided on the image plane side with respect to the center line AX of the first cam 53a.
  • the cam follower 11 of the first group frame 10 of the present embodiment includes a first cam follower 11a protruding in the radial direction from the inner diameter of the first group frame 10.
  • the second cam follower 11b further protrudes in the radial direction of the first group frame from the upper surface of the first cam follower 11a (the surface along the vertical direction in FIG. 5B-2).
  • the first cam follower 11a has a cylindrical shape as shown in FIGS. 5 (b-1) and 5 (b-2).
  • the second cam follower 11b has a truncated cone shape as shown in FIGS. 5 (b-1) and 5 (b-2).
  • the diameter of the cylindrical second cam follower 11b is smaller than the diameter of the truncated cone-shaped first cam follower 11a. That is, the first cam follower 11a has a larger sectional area than the second cam follower 11b, as shown in FIG. 5 (b-2).
  • the height of the 1st cam follower 11a and the height of the 2nd cam follower 11b are formed substantially the same.
  • the first cam follower 11a and the second cam follower 11b are arranged so that the end surfaces on the image plane side in the optical axis direction are substantially on the same plane.
  • the second cam 53b is formed in a region in the optical axis direction of the inner peripheral surface of the cam frame 50, as shown in FIGS. 5 (a-1) and 5 (a-2). That is, the second cam 53b has side surfaces that face each other in almost all regions on the inner peripheral surface of the cam frame 50.
  • the portion of the first cam 53a that is formed at the end closest to the subject protrudes from the region of the inner peripheral surface of the cam frame 50 in the optical axis direction. That is, the second cam 53b can ensure a longer distance from the end on the image plane side to the end on the subject side than the second cam 53a. Therefore, when the length of the cam frame 50 in the optical axis direction is the same, the second cam 53b can take a larger stroke than the first cam 53a.
  • the necessary stroke amount is ensured by the second cam 53b and the second cam follower 11b having a small cylindrical diameter.
  • the stroke of the cam 53 is designed to be the same, in this embodiment, the length of the cam frame 50 in the optical axis direction can be shortened. For this reason, the length in the optical axis direction in a state in which the lens barrel 100 is housed can be made smaller than the conventional one.
  • the cam follower 11 is configured by stacking the first cam follower 11a having a large diameter and the second cam follower 11b having a small diameter in two stages. Thereby, since the force when external force is added in the 1st cam follower 11a with a larger diameter than the 2nd cam follower 11b can be received, it can suppress that the cam follower 11 is destroyed.
  • the lens barrel 100 of the present embodiment has the first cam follower 11a in the radial direction from the first cam 53a even when a large external force F is applied. It can suppress that it slips and drops.
  • the first group frame 10 is displaced in the radial direction and falls off the cam frame 50.
  • the cam follower 11 is difficult to drop off from the cam 53 even when a large external force F is applied. .
  • the lens barrel 100 of the present embodiment can improve the strength against the external force as compared with the related art without increasing the length in the optical axis direction.
  • the angle ⁇ formed by the two opposite side surfaces of the first cam follower 11a in the cross section in the optical axis direction is the second cam follower in the cross section in the optical axis direction. It is smaller than the angle ⁇ formed by the two side surfaces of 11b facing each other. That is, the side surface of the second cam follower 11b is inclined with respect to the side surface of the first cam follower 11a.
  • a slight gap W is provided between the first cam 53a and the first cam follower 11a as shown in FIG.
  • the first cam 53a and the first cam follower 11a do not slide, and the second cam 53b and the second cam follower 11b slide.
  • the second cam follower 11b slides on the inclined side surface of the second cam 53b, and the first cam follower 11a contacts the first cam 53a.
  • the gap W is desirably set to a minimum dimension in which the first cam follower 11a does not come into contact with the first cam 53a in a normal use state, for example, about 0.01 to 0.05 mm. In this way, by minimizing the gap W, even when an external force F is applied, the load applied to the second cam follower 11b, which is a component smaller than the first cam follower 11a, is reduced, and the second cam follower 11b is torn. Or deformation.
  • FIGS. 7A-1 to 7B-2 are views showing a cam 153 and a cam follower 111 as comparative examples.
  • FIG. 7A-1 is a development view of the outer peripheral surface of the cam frame 150
  • FIG. 7A-2 is a cross-sectional view taken along the line AA in FIG. 7A-1.
  • FIG. 7B-1 is a development view of the inner peripheral surface of the first group frame 110
  • FIG. 7B-2 is a cross-sectional view taken along line BB in FIG. 7B-1
  • FIGS. 8A and 8B are diagrams showing an engagement relationship between a cam 153 and a cam follower 111 as a comparative example.
  • FIG. 8A is a cross-sectional view showing the engagement state between the cam 153 and the cam follower 111 in a normal state
  • FIG. 8B shows the engagement state between the cam 153 and the cam follower 111 when an external force F is applied. It is sectional drawing shown.
  • the cam 153 of the comparative example has the same shape as the first cam 53a and the second cam 53b according to the present embodiment, but has a different arrangement relationship. . That is, in the present embodiment, the center line BX of the second cam 53b is provided closer to the image plane side than the center line AX of the first cam 53a, whereas in the comparative example, the first cam 153a and the second cam The center line of 153b is arranged at the same position.
  • the cam follower 111 of the first group frame 110 of the comparative example has the same shape as the first cam follower 111a and the second cam follower 111b, but the arrangement relationship is different. . That is, the center of the first cam follower 111a and the center of the second cam follower 111b are formed coaxially. Therefore, there is a step corresponding to the dimension L in the contour on the most image plane side between the first cam follower 111a and the second cam follower 111b.
  • the first group frame 110 of the comparative example is Compared to the first group frame 10 of the embodiment, the length becomes longer in the optical axis direction by the dimension L. Therefore, if the first group frame 110 is long, it is necessary to absorb the length of the first group frame 110 by other portions, and the dimension in the optical axis direction in a state in which the lens barrel is housed is also increased. Therefore, in this embodiment, the length of the first group frame 10 in the optical axis direction can be made shorter than the length of the first group frame 110 according to the comparative example in the optical axis direction.
  • the lens barrel 100 generally includes the first group frame 10 positioned closest to the subject side when, for example, a camera equipped with the first group frame 10 lens barrel 100 is dropped during shooting.
  • a large external force F is applied in the direction of pushing to the side.
  • the case where a large external force F is applied to the first group frame 110 in the configuration of the comparative example will be considered with reference to FIGS. 8A and 8B.
  • the first cam follower 111a When the first cam follower 111a receives an external force F, the first cam follower 111a is displaced from the first cam 153a in the radial direction, and falls off the first cam 153a. If a larger external force F is applied in this state, the cam follower 111 falls off the cam 153. On the other hand, in the lens barrel 100 of the present embodiment, even when an external force F having the same magnitude as that of the comparative example is applied, the cam follower 11 is less likely to drop off from the cam 53 as described above as compared to the comparative example. ing.
  • the second cam follower 11b be installed at the position closest to the image plane of the first cam follower 11a. That is, it is desirable that the height of the second cam follower 11b and the first cam follower 11a closest to the image plane in the optical axis direction is substantially the same.
  • the lens barrel 100 of the present embodiment can improve the strength against external force while shortening the length in the optical axis direction.
  • other embodiments according to the technology disclosed herein will be described.
  • FIGS. 9A-1 to 9B-2 are views showing the cam 53 and the cam follower 11 of this embodiment.
  • the first cam follower 11a has a truncated cone shape in a sectional view.
  • the second cam follower 11b has a shape in which a part of a circular arc portion in a columnar shape is folded back in the optical axis direction and overlapped.
  • the slope on the image plane side of the second cam follower 11b is a surface that is continuous with the slope of the first cam follower 11a.
  • the center line BX of the second cam 53b is provided on the image plane side with respect to the center line AX of the first cam 53a, as in the first embodiment.
  • the shape of the cam follower 11 of the present embodiment is slightly different from the shape of the cam follower 11 of the first embodiment, it has the same operations and effects.
  • the shapes of the two types of cam followers 11 have been described.
  • this technique is not illustrated, other shapes can be adopted, and an appropriate shape may be selected according to the design.
  • FIGS. 10A-1 to 10B-2 are views showing the cam 53 and the cam follower 11 of this embodiment.
  • the shape of the second cam 53b of the cam frame of the present embodiment is the same as that of the second cam 53b of the first embodiment.
  • the cam 53 of the present embodiment has a first cam 53a that comes into contact with the cam follower 11 when the first group frame 10 receives an external force F (see FIG. 6A and the like), and at least on the subject side of the first cam 53a. It differs from the said Embodiment 1 by the point which has the thin part 54 provided.
  • the thin portion 54 does not have a side surface (cam surface) on the subject side in the portion of the first cam 53a, and has a side surface (cam surface) only on the image surface side.
  • the shape of the side surface on the image surface side of the first cam 53a is the same as that in the first embodiment.
  • the thin portion 54 is provided on the subject side of the cam frame 50 from the first cam 53a, and the cross-sectional thickness of the cam frame 50 is closer to the image surface than the first cam 53a than the thin portion 54.
  • a large thick portion 55 is provided.
  • the cam frame 50 of the present embodiment includes a thin portion 54 that is thinner than other regions, and a second cam 53b that is provided on the image plane side of the thin portion 54 and has a cam frame 50 that is thinner than the thin portion 54. And having.
  • the cam follower 11 of the present embodiment has a shape that is substantially the same as the shape of the second cam follower 11b of the first embodiment. It is.
  • the cam follower 11 is provided on the subject side from the region facing the first cam follower 11a that contacts the first cam 53a and the second cam 53b, and is thicker than the other portions. And a reinforced portion 12.
  • the second cam follower 11b is formed so as to protrude further in the radial direction from the first cam follower 11a, and is engaged with the second cam 53b.
  • the strength of the first group frame 10 can be improved because the present embodiment includes the reinforcing portion 12 that is thicker than the other portions as compared with the configuration of the first embodiment. .
  • the first group frame 10 becomes difficult to be deformed. Therefore, even when the same external force F (see FIG. 6A, etc.) is applied to the first group frame 10, the present embodiment is implemented.
  • the cam follower 11 of the form can be more difficult to drop off from the cam 53 than the cam follower 11 of the first embodiment.
  • FIGS. 11 (a-1) to 11 (b-2) are views showing the cam 53 and the cam follower 11 of this embodiment.
  • the shape of the second cam 53b is substantially the same as in the first embodiment and the third embodiment. is there.
  • the cam 53 of the present embodiment includes a first cam 53a that contacts the cam follower 11 when an external force F (see FIG. 6A, etc.) is applied to the first group frame 10, and at least the subject of the first cam 53a.
  • the third embodiment is the same as the third embodiment in that it has a thin portion 54 provided on the side.
  • the cam follower 11 of the present embodiment is different from the cam follower 11 of the third embodiment in that the outer diameters of the first cam follower 11a and the second cam follower 11b are the same. Further, the cam follower 11 of the present embodiment has a smaller reinforcing portion 12 around the second cam follower 11b than the cam follower 11 of the third embodiment.
  • the first group frame 10 of the present embodiment is provided with the reinforcing portion 12, and therefore can more effectively improve the strength against external force.
  • the cam surface on the image surface side can be formed into a shape having no step between the cam surface of the first cam 53a and the cam surface of the second cam 53b. is there.
  • the lens barrel 100 of the present embodiment has a substantially cylindrical fixed frame 30, a substantially cylindrical cam frame 50 (an example of a moving frame) disposed on the inner periphery of the fixed frame 30, and the fixed frame 30. And a drive mechanism 70 that rotationally drives the cam frame 50.
  • the fixed frame 30 has a plurality of guide protrusions 31 on the inner peripheral surface for guiding the cam frame 50 in the direction of the rotation axis as the cam frame 50 rotates.
  • the drive mechanism 70 has a plurality of drive gears 72.
  • the cam frame 50 has a driven gear portion 52 that meshes with the plurality of drive gears 72 and a guide groove 51 that meshes with the guide protrusion 31 but does not mesh with the plurality of drive gears 72 on the outer peripheral surface.
  • the driven gear portion 52 includes a missing tooth portion 52 a provided with a guide groove 51.
  • the drive mechanism 70 is configured such that at least one of the plurality of drive gears 72 meshes with the driven gear portion 52 in the use state. With this configuration, even when the driven gear portion 52 provided on the cam frame 50 and the guide groove 51 are arranged so as to overlap each other, at least one of the plurality of driving gears 72 always meshes with the driven gear portion 52. Can be maintained. For this reason, it is possible to provide a lens barrel having a small size in the optical axis direction while avoiding that the moving frame is idle even when one of the drive gears 72 comes to the portion of the missing tooth portion 52a. it can.
  • the technology disclosed herein can be applied to a device having a camera function, such as a camera, a mobile phone with a camera, a portable terminal with a camera, and the like.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)

Abstract

This lens barrel (100) is provided with a stationary frame (30), a cam frame (50) (an example of a mobile frame), and a drive mechanism (70) that rotationally drives the cam frame (50) with respect to the stationary frame (30). The stationary frame (30) has a plurality of guide protrusions (31) that guide the cam frame (50) in the direction of the rotational axis. The drive mechanism (70) has a plurality of drive gears (72). The cam frame (50) has a driven gear unit (52) and a guide groove (51). In the state of use, at least one of the drive gears (72) among the plurality of drive gears (72) is configured in a manner so as to engage the driven gear unit (52).

Description

レンズ鏡筒Lens barrel
 ここに開示された技術は、撮像装置に用いられるレンズ鏡筒に関する。 The technology disclosed herein relates to a lens barrel used in an imaging apparatus.
 従来、撮像装置に用いられる沈胴式のレンズ鏡筒は、駆動機構によってカム枠が回転駆動される。
 駆動機構は、駆動ギアを有しており、カム枠は、駆動ギアと係合される被駆動ギア部を有している。カム枠が回転駆動されることで、カム枠とカム機構によって係合された移動枠が光軸方向に進退する。
2. Description of the Related Art Conventionally, in a retractable lens barrel used in an imaging apparatus, a cam frame is rotationally driven by a drive mechanism.
The drive mechanism has a drive gear, and the cam frame has a driven gear portion that is engaged with the drive gear. When the cam frame is rotationally driven, the moving frame engaged with the cam frame by the cam mechanism advances and retreats in the optical axis direction.
 また、カム枠は、固定枠に保持されている。固定枠は、案内突起を有しており、カム枠は、案内突起と係合される案内溝を有している。カム枠が回転駆動されることで、カム枠は、固定枠に対して光軸方向に進退する(例えば、特許文献1参照)。 Also, the cam frame is held by a fixed frame. The fixed frame has a guide protrusion, and the cam frame has a guide groove to be engaged with the guide protrusion. When the cam frame is rotationally driven, the cam frame advances and retreats in the optical axis direction with respect to the fixed frame (see, for example, Patent Document 1).
特開2004-257555号公報JP 2004-257555 A 特開2006-154674号公報JP 2006-154664 A 特開平11-183771号公報Japanese Patent Laid-Open No. 11-183771
 しかしながら、このようなレンズ鏡筒において、カム枠に設けられた被駆動ギア部と案内溝とを重ねて配置する場合、駆動ギアが案内溝で空回りしないように、駆動ギアと被駆動ギア部の光軸方向の長さを十分に確保する必要があった。そのため、レンズ鏡筒が光軸方向において大きくなってしまうという課題があった。
 そこで、ここに開示された技術は、カム枠に設けられた被駆動ギア部と案内溝とを重ねて配置した場合でも、光軸方向における大きさを小さくすることが可能なレンズ鏡筒を提供することを目的とする。
However, in such a lens barrel, when the driven gear portion provided on the cam frame and the guide groove are arranged so as to overlap each other, the drive gear and the driven gear portion are prevented from rotating idle in the guide groove. It was necessary to ensure a sufficient length in the optical axis direction. For this reason, there is a problem that the lens barrel becomes large in the optical axis direction.
Therefore, the technology disclosed herein provides a lens barrel that can be reduced in size in the optical axis direction even when the driven gear portion provided on the cam frame and the guide groove are arranged in an overlapping manner. The purpose is to do.
 上記目的を達成するために、ここに開示された技術に係るレンズ鏡筒は、略円筒状の固定枠と、固定枠の内周に配置された略円筒状の移動枠と、固定枠に対して移動枠を回転駆動させる駆動機構と、を備えている。固定枠は、移動枠の回転に伴って、移動枠を回転軸方向に案内する複数の案内突起を内周面に有している。駆動機構は、複数の駆動ギアを有している。移動枠は、複数の駆動ギアと噛み合う被駆動ギア部と、案内突起とは噛み合うが複数の駆動ギアとは噛み合わない案内溝と、を外周に有している。被駆動ギア部は、案内溝部と重複する位置に設けられており案内突起と噛み合う部分を持たない欠歯部を含んでいる。駆動機構は、使用状態において、複数の駆動ギアのうちの少なくとも1つの駆動ギアが被駆動ギア部と噛み合うように構成されている。
(発明の効果)
 上記の構成によれば、カム枠に設けられた被駆動ギア部と案内溝とが重ねて配置されたレンズ鏡筒において、移動枠の回転が空回りすることを回避しつつ、光軸方向の大きさが小さいレンズ鏡筒を提供することができる。
In order to achieve the above object, a lens barrel according to the technology disclosed herein includes a substantially cylindrical fixed frame, a substantially cylindrical moving frame disposed on the inner periphery of the fixed frame, and a fixed frame. And a drive mechanism that rotationally drives the moving frame. The fixed frame has a plurality of guide protrusions on the inner peripheral surface for guiding the moving frame in the direction of the rotation axis as the moving frame rotates. The drive mechanism has a plurality of drive gears. The moving frame has a driven gear portion that meshes with the plurality of drive gears, and a guide groove that meshes with the guide protrusion but does not mesh with the plurality of drive gears on the outer periphery. The driven gear portion includes a missing tooth portion that is provided at a position overlapping the guide groove portion and does not have a portion that meshes with the guide protrusion. The drive mechanism is configured such that at least one drive gear of the plurality of drive gears meshes with the driven gear portion when in use.
(The invention's effect)
According to the above configuration, in the lens barrel in which the driven gear portion provided on the cam frame and the guide groove are overlapped with each other, the rotation of the moving frame is avoided and the size in the optical axis direction is avoided. A small lens barrel can be provided.
実施の形態1に係るレンズ鏡筒の分解斜視図。1 is an exploded perspective view of a lens barrel according to Embodiment 1. FIG. 図1のレンズ鏡筒に含まれる固定枠の内周面の展開図。The expanded view of the internal peripheral surface of the fixed frame contained in the lens-barrel of FIG. 図1のレンズ鏡筒に含まれるカム枠の外周面の展開図。FIG. 2 is a development view of an outer peripheral surface of a cam frame included in the lens barrel of FIG. 1. 図1のレンズ鏡筒に含まれるカム枠と駆動ギアとの係合関係を示す図。The figure which shows the engagement relationship of the cam frame and drive gear which are contained in the lens barrel of FIG. (a-1)~(b-2)は、図1のレンズ鏡筒に含まれるカムとカムフォロワとの関係を示す図。(A-1) to (b-2) are diagrams showing a relationship between a cam and a cam follower included in the lens barrel of FIG. (a),(b)は、図1のレンズ鏡筒に含まれるカムとカムフォロワとの係合関係を示す図。(A), (b) is a figure which shows the engagement relationship of the cam and cam follower which are contained in the lens-barrel of FIG. (a-1)~(b-2)は、比較例に係るカムとカムフォロワとの関係を示す図。(A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on a comparative example, and a cam follower. (a),(b)は、比較例に係るカムとカムフォロワとの係合関係を示す図。(A), (b) is a figure which shows the engagement relation of the cam which concerns on a comparative example, and a cam follower. (a-1)~(b-2)は、実施の形態2に係るカムとカムフォロワとの関係を示す図。(A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on Embodiment 2, and a cam follower. (a-1)~(b-2)は、実施の形態3に係るカムとカムフォロワとの関係を示す図。(A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on Embodiment 3, and a cam follower. (a-1)~(b-2)は、実施の形態4に係るカムとカムフォロワとの関係を示す図。(A-1)-(b-2) is a figure which shows the relationship between the cam which concerns on Embodiment 4, and a cam follower.
 (実施の形態1)
 [1.レンズ鏡筒の構成]
 図1は、本実施形態に係るレンズ鏡筒100の分解斜視図である。
 レンズ鏡筒100は、デジタルスチルカメラ等のカメラ機能を有する装置に搭載される。レンズ鏡筒100は、その内部にズームレンズやフォーカスレンズなどの各種レンズを有する光学系を備えている。レンズ鏡筒100の光学系は、入射する光を撮像素子上に結像させる。撮像素子は、入射する光を電気信号に変換する。
(Embodiment 1)
[1. Lens barrel configuration]
FIG. 1 is an exploded perspective view of a lens barrel 100 according to the present embodiment.
The lens barrel 100 is mounted on a device having a camera function such as a digital still camera. The lens barrel 100 includes an optical system having various lenses such as a zoom lens and a focus lens therein. The optical system of the lens barrel 100 forms incident light on the image sensor. The image sensor converts incident light into an electrical signal.
 なお、本実施形態に係るレンズ鏡筒100は、ここに開示された技術の一例であって、デジタルスチルカメラに限らず、ビデオカメラなどにも搭載が可能である。
 レンズ鏡筒100は、1群枠(移動枠)10、2群枠20、固定枠30、駆動機構70、直進枠40、カム枠50、およびマスターフランジ60が、互いに同軸位置に配置されている(以下、この軸方向を光軸方向と称する。)。
The lens barrel 100 according to this embodiment is an example of the technology disclosed herein, and can be mounted not only on a digital still camera but also on a video camera or the like.
In the lens barrel 100, a first group frame (moving frame) 10, a second group frame 20, a fixed frame 30, a drive mechanism 70, a rectilinear frame 40, a cam frame 50, and a master flange 60 are arranged at coaxial positions. (Hereinafter, this axial direction is referred to as an optical axis direction.)
 固定枠30は、内部に直進枠40およびカム枠50を保持している。直進枠40は、内部に1群枠10を直進自在に保持している。1群枠10は、内部のカム枠50をカム機構により係合している。1群枠10は、内部に2群枠20を保持している。
 本実施形態では、以上の構成により、レンズ鏡筒100の光学系が構成される。
 そして、固定枠30が、撮像素子を備えたマスターフランジ60に固定される。
The fixed frame 30 holds the rectilinear frame 40 and the cam frame 50 inside. The rectilinear frame 40 holds the first group frame 10 so as to be linearly movable. The first group frame 10 is engaged with an internal cam frame 50 by a cam mechanism. The first group frame 10 holds the second group frame 20 therein.
In the present embodiment, the optical system of the lens barrel 100 is configured by the above configuration.
And the fixed frame 30 is fixed to the master flange 60 provided with the image pick-up element.
 1群枠10は、最も被写体側に配置されるレンズを保持する円筒状の枠体である。1群枠10は、直進枠40に対し光軸方向に進退する。1群枠10は、外径方向に突出した直進突起を有している。直進突起が直進枠40の内周面に設けられた直進溝に係合されることにより、1群枠10は、直進枠40に対して相対回転しないように直進枠40内に保持される。1群枠10は、内周面に3つのカムフォロワ11(図5(b-1)等参照)が設けられている。カムフォロワ11は、カム枠50の外周面に設けられたカム53と係合している。 The first group frame 10 is a cylindrical frame that holds a lens arranged closest to the subject. The first group frame 10 advances and retreats in the optical axis direction with respect to the rectilinear frame 40. The first group frame 10 has a rectilinear protrusion that protrudes in the outer diameter direction. The first group frame 10 is held in the rectilinear frame 40 so as not to rotate relative to the rectilinear frame 40 by engaging the rectilinear protrusions with rectilinear grooves provided on the inner peripheral surface of the rectilinear frame 40. The first group frame 10 is provided with three cam followers 11 (see FIG. 5B-1 and the like) on the inner peripheral surface. The cam follower 11 is engaged with a cam 53 provided on the outer peripheral surface of the cam frame 50.
 2群枠20は、内部にレンズを保持している。2群枠20は、1群枠10内に保持されている。なお、ここでは詳しい説明は省略するが、2群枠20も、1群枠10と同様の機構により光軸方向において進退する。
 固定枠30は、内周側の面において直進枠40を直進自在に保持している。固定枠30の内周面には、直進溝が設けられている。この直進溝が直進枠40の外周面に設けられた直進突起と係合されることにより、直進枠40を固定枠30に対して直進させることができる。
The second group frame 20 holds a lens therein. The second group frame 20 is held in the first group frame 10. Although detailed explanation is omitted here, the second group frame 20 is also advanced and retracted in the optical axis direction by the same mechanism as the first group frame 10.
The fixed frame 30 holds the rectilinear frame 40 on the inner peripheral surface so as to be able to move straight. A rectilinear groove is provided on the inner peripheral surface of the fixed frame 30. By engaging the rectilinear grooves with rectilinear protrusions provided on the outer peripheral surface of the rectilinear frame 40, the rectilinear frame 40 can be linearly moved with respect to the fixed frame 30.
 また、固定枠30は、カム枠50を回転可能に保持している。固定枠30の内周面には、らせん状の案内突起31が設けられている。この案内突起31がカム枠50の外周面に設けられた案内溝51と係合されることにより、カム枠50を固定枠30に対して回転させることができる。また、固定枠30には、外周面の一部が切り欠かれた開口部34が設けられている。固定枠30の外周面側には、駆動機構70が配置されている。駆動機構70は、カム枠50を回転駆動させる。 Further, the fixed frame 30 holds the cam frame 50 in a rotatable manner. A spiral guide projection 31 is provided on the inner peripheral surface of the fixed frame 30. By engaging the guide protrusion 31 with a guide groove 51 provided on the outer peripheral surface of the cam frame 50, the cam frame 50 can be rotated with respect to the fixed frame 30. The fixed frame 30 is provided with an opening 34 in which a part of the outer peripheral surface is cut out. A drive mechanism 70 is disposed on the outer peripheral surface side of the fixed frame 30. The drive mechanism 70 drives the cam frame 50 to rotate.
 駆動機構70は、モータと連結された連結ギア71と、2つの駆動ギア72と、を有している。2つの駆動ギア72は、開口部34を介して、固定枠30の内部のカム枠50と係合される。2つの駆動ギア72は、さらに外側に設けられた連結ギア71とそれぞれ係合されている。連結ギア71は、モータにより回転駆動される。連結ギア71は2つの駆動ギア72のそれぞれと噛み合っているため、3つギアが連動して回転することにより、カム枠50が回転駆動される。 The drive mechanism 70 has a connection gear 71 connected to a motor and two drive gears 72. The two drive gears 72 are engaged with the cam frame 50 inside the fixed frame 30 through the opening 34. The two drive gears 72 are respectively engaged with a connection gear 71 provided on the outer side. The connection gear 71 is rotationally driven by a motor. Since the connecting gear 71 meshes with each of the two drive gears 72, the cam frame 50 is rotationally driven by the three gears rotating together.
 直進枠40は、固定枠30内において光軸方向へ直進自在に保持されている。直進枠40は、直進枠40に対して光軸方向に直進自在、かつ固定枠30に対して相対回転しないように、1群枠10を保持している。直進枠40は、カム枠50の外周とバヨネット結合され、カム枠50を回転可能に保持している。そのため、直進枠40は、カム枠50と一体となって光軸方向へ進退する。つまり、直進枠40は、カム枠50に対し相対回転は自在で、かつカム枠50に対して光軸方向には進退しないように固定枠30に保持されている。 The rectilinear frame 40 is held in the fixed frame 30 so as to be linearly movable in the optical axis direction. The rectilinear frame 40 holds the first group frame 10 so as to be linearly movable in the optical axis direction with respect to the rectilinear frame 40 and not to rotate relative to the fixed frame 30. The rectilinear frame 40 is bayonet-coupled to the outer periphery of the cam frame 50, and holds the cam frame 50 rotatably. Therefore, the rectilinear frame 40 moves forward and backward in the optical axis direction together with the cam frame 50. That is, the rectilinear frame 40 is held by the fixed frame 30 so as to be relatively rotatable with respect to the cam frame 50 and not to advance or retreat in the optical axis direction with respect to the cam frame 50.
 カム枠50の外周面には、3つのカム53が形成されている。カム53は、1群枠の内周面に設けられた3つのカムフォロワ11(図5(b-1)等参照)と係合している。カム枠50の外側には、2つの駆動ギア72と噛み合う被駆動ギア部52が設けられている。カム枠50は、駆動ギア72の回転により、回転駆動される。カム枠50が回転駆動されると、カム機構を介してカム枠50を保持している1群枠10が、光軸方向に直進駆動される。 Three cams 53 are formed on the outer peripheral surface of the cam frame 50. The cam 53 is engaged with three cam followers 11 (see FIG. 5B-1 etc.) provided on the inner peripheral surface of the first group frame. A driven gear portion 52 that meshes with the two drive gears 72 is provided outside the cam frame 50. The cam frame 50 is rotationally driven by the rotation of the drive gear 72. When the cam frame 50 is driven to rotate, the first group frame 10 holding the cam frame 50 via the cam mechanism is driven straight in the optical axis direction.
 さらに、カム枠50の外周面には、固定枠30側の案内突起31と係合される案内溝51が設けられている。案内突起31は、固定枠30の内周面にらせん状に設けられている。このため、駆動ギア72によってカム枠50が回転駆動されると、カム枠50が固定枠30の案内突起31に沿って案内される。
 これにより、カム枠50が回転しながら固定枠30に対して光軸方向へ進退する。その際、1群枠10は、直進枠40に対して相対回転しないので、1群枠10はカム枠50に対し相対回転する状態となる。この結果、1群枠10は、カム53に案内されて光軸方向に進退する。2群枠20も、1群枠10と同様の機構により光軸方向に進退する。
Furthermore, a guide groove 51 that is engaged with the guide protrusion 31 on the fixed frame 30 side is provided on the outer peripheral surface of the cam frame 50. The guide protrusion 31 is provided on the inner peripheral surface of the fixed frame 30 in a spiral shape. For this reason, when the cam frame 50 is rotationally driven by the drive gear 72, the cam frame 50 is guided along the guide protrusion 31 of the fixed frame 30.
Thereby, the cam frame 50 advances and retreats in the optical axis direction with respect to the fixed frame 30 while rotating. At this time, the first group frame 10 does not rotate relative to the rectilinear frame 40, so that the first group frame 10 rotates relative to the cam frame 50. As a result, the first group frame 10 advances and retreats in the optical axis direction while being guided by the cam 53. The second group frame 20 is also advanced and retracted in the optical axis direction by the same mechanism as the first group frame 10.
 以上のように、1群枠10、2群枠20、固定枠30、直進枠40、カム枠50、およびマスターフランジ60が組み付けられることにより、1群枠10レンズ鏡筒100の光学系が構成される。
 マスターフランジ60には、撮像素子および固定枠30が固定されている。これにより、レンズ鏡筒100の光学系を通過した光が、マスターフランジ60に固定された撮像素子上に結像される。
As described above, the first group frame 10, the second group frame 20, the fixed frame 30, the rectilinear frame 40, the cam frame 50, and the master flange 60 are assembled to constitute the optical system of the first group frame 10 lens barrel 100. Is done.
The image sensor and the fixed frame 30 are fixed to the master flange 60. As a result, the light passing through the optical system of the lens barrel 100 is imaged on the image sensor fixed to the master flange 60.
 ここで、固定枠30に設けられた案内突起31と、カム枠50に設けられたカム53とは、カム枠50の回転角度に対して適切な位置になるように設計される。そのため、カム枠50の回転角度に対して、1群枠10に固定されたレンズが所定の位置にくるように配置される。これにより、レンズ鏡筒100は、撮影状態において光学系の焦点距離を変更したり、非撮影状態において光学系を収納したりすることができる。 Here, the guide protrusion 31 provided on the fixed frame 30 and the cam 53 provided on the cam frame 50 are designed so as to be at appropriate positions with respect to the rotation angle of the cam frame 50. Therefore, the lens fixed to the first group frame 10 is disposed at a predetermined position with respect to the rotation angle of the cam frame 50. Thereby, the lens barrel 100 can change the focal length of the optical system in the shooting state, or can house the optical system in the non-shooting state.
 [2.固定枠とカム枠との係合関係]
 次に、固定枠30とカム枠50との係合関係について詳しく説明する。
 図2は、本実施形態の固定枠30の内周面の展開図である。図2において、ハッチングされた領域は、他の領域よりも内径方向に突出していることを示している。
 固定枠30の内周面には、図2に示すように、複数の案内突起31が設けられている。
[2. Engagement between fixed frame and cam frame]
Next, the engagement relationship between the fixed frame 30 and the cam frame 50 will be described in detail.
FIG. 2 is a development view of the inner peripheral surface of the fixed frame 30 of the present embodiment. In FIG. 2, the hatched area protrudes in the inner diameter direction from the other areas.
As shown in FIG. 2, a plurality of guide protrusions 31 are provided on the inner peripheral surface of the fixed frame 30.
 複数の案内突起31は、内径方向に突出している。このように、固定枠30の内周面には、らせん状の案内突起31が複数形成されている。また、固定枠30は、径方向に貫通した開口部34を有している。固定枠30の開口部34の外側には、図1に示すように、駆動ギア72および連結ギア71が配置されている。
 図3は、本実施形態のカム枠50の外周面の展開図である。図3において、ハッチングされた領域は、他の領域よりも外径方向に突出していることを示している。
The plurality of guide protrusions 31 protrude in the inner diameter direction. Thus, a plurality of spiral guide protrusions 31 are formed on the inner peripheral surface of the fixed frame 30. Further, the fixed frame 30 has an opening 34 penetrating in the radial direction. As shown in FIG. 1, a drive gear 72 and a connection gear 71 are disposed outside the opening 34 of the fixed frame 30.
FIG. 3 is a development view of the outer peripheral surface of the cam frame 50 of the present embodiment. In FIG. 3, the hatched area is projected in the outer diameter direction from the other areas.
 カム枠50の外周面には、図3に示すように、被駆動ギア部52が設けられている。被駆動ギア部52は、外径方向に突出しており、駆動ギア72と噛み合わされる。また、カム枠50の外周部には、複数の案内溝51がらせん状に設けられている。複数の案内溝51は、固定枠30側の複数の案内突起31と係合される。
 複数の案内溝51の少なくとも1つは、被駆動ギア部52に重なって配置されている。そのため、被駆動ギア部52において案内溝51が設けられた部分は、歯が欠けた欠歯部52aとなっている。
As shown in FIG. 3, a driven gear portion 52 is provided on the outer peripheral surface of the cam frame 50. The driven gear portion 52 protrudes in the outer diameter direction and meshes with the driving gear 72. A plurality of guide grooves 51 are spirally provided on the outer peripheral portion of the cam frame 50. The plurality of guide grooves 51 are engaged with the plurality of guide protrusions 31 on the fixed frame 30 side.
At least one of the plurality of guide grooves 51 is disposed so as to overlap the driven gear portion 52. Therefore, the portion of the driven gear portion 52 where the guide groove 51 is provided is a missing tooth portion 52a with missing teeth.
 ここで、固定枠30の内周側にカム枠50が挿入された状態で、固定枠30に対しカム枠50を回転させると、固定枠30の案内突起31とカム枠50の案内溝51とが係合し、カム枠50が光軸方向に案内される。
 本実施形態では、駆動ギア72と被駆動ギア部52とが噛み合うことによって、カム枠50が回転駆動される。しかし、通常、駆動ギア72が欠歯部52aと重なる場合、駆動ギア72と被駆動ギア部52とは噛み合わず、駆動ギア72が空回りしてしまう。
Here, when the cam frame 50 is rotated with respect to the fixed frame 30 in a state where the cam frame 50 is inserted on the inner peripheral side of the fixed frame 30, the guide protrusion 31 of the fixed frame 30 and the guide groove 51 of the cam frame 50 Are engaged, and the cam frame 50 is guided in the optical axis direction.
In the present embodiment, the cam frame 50 is rotationally driven by the engagement of the drive gear 72 and the driven gear portion 52. However, normally, when the drive gear 72 overlaps the toothless portion 52a, the drive gear 72 and the driven gear portion 52 do not mesh with each other, and the drive gear 72 is idle.
 これを回避する方法として、被駆動ギア部52の光軸方向の長さT(図3参照)を長くする方法が用いられる。つまり、被駆動ギア部52の光軸方向の長さTを長くすると、被駆動ギア部52に欠歯部52aはあっても、案内溝51は光軸方向に対し傾斜しているので、光軸方向における領域内のいずれかの箇所で駆動ギア72と被駆動ギア部52とが噛み合う。 As a method of avoiding this, a method of increasing the length T (see FIG. 3) of the driven gear portion 52 in the optical axis direction is used. That is, when the length T of the driven gear portion 52 in the optical axis direction is increased, the guide groove 51 is inclined with respect to the optical axis direction even if the driven gear portion 52 has the missing tooth portion 52a. The drive gear 72 and the driven gear portion 52 mesh with each other in any part of the region in the axial direction.
 しかしながら、被駆動ギア部52の光軸方向の長さTを長くしてしまうと、固定枠30内におけるカム枠50の進退ストローク量が減少してしまう。
 そこで、本実施形態では、駆動ギア72を複数(本実施形態では、2個)設け、使用状態において、常に、複数の駆動ギア72のうち少なくとも1つが、被駆動ギア部52と噛み合うように構成されている。
However, if the length T of the driven gear portion 52 in the optical axis direction is increased, the advance / retreat stroke amount of the cam frame 50 in the fixed frame 30 is reduced.
Accordingly, in the present embodiment, a plurality of drive gears 72 (two in the present embodiment) are provided, and at least one of the plurality of drive gears 72 is always in mesh with the driven gear portion 52 in use. Has been.
 図4は、本実施形態のカム枠50と駆動ギア72との係合関係を示す図である。
 本実施形態の駆動ギア72は、図4示すように、第1駆動ギア72aと第2駆動ギア72bとを有する。第1駆動ギア72aと第2駆動ギア72bとは、それぞれ被駆動ギア部52と噛み合う。また、第1駆動ギア72aと第2駆動ギア72bとは、それぞれ連結ギア71と噛み合う。
FIG. 4 is a diagram illustrating an engagement relationship between the cam frame 50 and the drive gear 72 according to the present embodiment.
The drive gear 72 of this embodiment has the 1st drive gear 72a and the 2nd drive gear 72b, as shown in FIG. The first drive gear 72a and the second drive gear 72b mesh with the driven gear portion 52, respectively. The first drive gear 72a and the second drive gear 72b mesh with the connection gear 71, respectively.
 これにより、被駆動ギア部52の光軸方向の長さTを短くしても、問題なく駆動することができる。この結果、光軸方向の長さが等しい従来のレンズ鏡筒と比較した場合、従来よりもカム枠の進退ストローク量を大きくすることができる。
 以上の構成によれば、カム枠50に設けられた被駆動ギア部52と案内溝51とを重ねて配置した場合でも、被駆動ギア部52の一部に形成された案内溝51と重複する欠歯部52aの部分において、例えば、第1駆動ギア72aが空回りしても、第2駆動ギア72bが噛み合っているため、カム枠50の空回りを回避することができる。よって、カム枠50に設けられた被駆動ギア部52と案内溝51とを重ねて配置した構成において、カム枠50の空回りを回避しつつ、光軸方向における大きさが従来よりも小さいレンズ鏡筒100を提供することができる。
Thereby, even if the length T of the driven gear portion 52 in the optical axis direction is shortened, it can be driven without any problem. As a result, when compared with a conventional lens barrel having the same length in the optical axis direction, the amount of stroke of the cam frame can be increased as compared with the conventional lens barrel.
According to the above configuration, even when the driven gear portion 52 provided in the cam frame 50 and the guide groove 51 are arranged so as to overlap each other, the guide groove 51 formed in a part of the driven gear portion 52 is overlapped. For example, even if the first drive gear 72a rotates idly in the part of the toothless portion 52a, the idle rotation of the cam frame 50 can be avoided because the second drive gear 72b is engaged. Therefore, in the configuration in which the driven gear portion 52 provided in the cam frame 50 and the guide groove 51 are arranged so as to overlap each other, a lens mirror having a smaller size in the optical axis direction than the conventional one while avoiding the idling of the cam frame 50. A tube 100 can be provided.
 一方、必要なストローク量を確保できる範囲で、固定枠30の光軸方向の長さを短くすれば、鏡筒を収納した状態におけるレンズ鏡筒100の光軸方向における長さを小さくすることができる。
 なお、本実施形態では、駆動ギア72を2つ設けた構成を示したが、3つ以上の駆動ギアを含む構成であってもよい。
On the other hand, if the length of the fixed frame 30 in the optical axis direction is shortened within a range in which a necessary stroke amount can be secured, the length of the lens barrel 100 in the optical axis direction when the lens barrel is housed can be reduced. it can.
In the present embodiment, a configuration in which two drive gears 72 are provided is shown, but a configuration including three or more drive gears may be used.
 また、本実施形態では、第1・第2駆動ギア72a,72bに対して単一の連結ギア71が噛み合っており、連結ギア71を回転させることで、2つの第1・第2駆動ギア72a,72bを回転駆動させる構成について説明したがこれに限定されるものではない。
 例えば、複数の駆動ギアに対して1つずつ連結ギアを設け、複数の連結ギアによって複数の駆動ギアをそれぞれ回転駆動する構成であってもよい。
In the present embodiment, the single connecting gear 71 meshes with the first and second driving gears 72a and 72b, and the first and second driving gears 72a are rotated by rotating the connecting gear 71. , 72b has been described as being rotationally driven, but is not limited thereto.
For example, one connection gear may be provided for each of the plurality of drive gears, and the plurality of drive gears may be rotationally driven by the plurality of connection gears.
 ただし、本実施形態のように、単一の連結ギア71によって複数の第1・第2駆動ギア72a,72bを回転駆動することで、レンズ鏡筒100内の部品点数を簡素化することができるという利点を考慮すれば、できるだけ少ない数の連結ギアを用いて複数の駆動ギアを回転駆動することが好ましい。
 さらに、本実施形態では、同じ駆動ギア72が2つ並んでいる構成を示しているが、第1駆動ギア72aと第2駆動ギア72bとの光軸方向の長さ、外径または歯数が異なっていてもよく、設計に応じて適切に選定すればよい。
However, the number of parts in the lens barrel 100 can be simplified by rotationally driving the plurality of first and second drive gears 72a and 72b with a single connecting gear 71 as in the present embodiment. In view of this advantage, it is preferable to rotationally drive a plurality of drive gears using as few connecting gears as possible.
Furthermore, in the present embodiment, a configuration in which two identical drive gears 72 are arranged is shown. However, the length, outer diameter, or number of teeth of the first drive gear 72a and the second drive gear 72b in the optical axis direction are shown. They may be different and may be selected appropriately according to the design.
 例えば、回転軸方向における高さが異なる駆動ギアを用いた場合には、他の駆動ギアよりも短い駆動ギアの部分に対して他の部品等を近接して配置することができる。よって、多数の部品を搭載しているレンズ鏡筒内における回転軸方向のスペースを確保することができる。
 [3.1群枠とカム枠との係合関係]
 次に、本実施形態の1群枠10とカム枠50との係合関係について詳しく説明する。
For example, when drive gears having different heights in the rotation axis direction are used, other components or the like can be arranged close to the drive gear portion shorter than the other drive gears. Therefore, it is possible to secure a space in the direction of the rotation axis in the lens barrel on which a large number of components are mounted.
[3.1 Relationship of engagement between the group frame and the cam frame]
Next, the engagement relationship between the first group frame 10 and the cam frame 50 of this embodiment will be described in detail.
 図5(a-1)~図5(b-2)は、本実施形態のカム53とカムフォロワ11を示す図である。具体的には、図5(a-1)は、カム枠50の外周面の展開図、図5(a-2)は、(a-1)におけるA-A断面図である(以下、図7、図9、図10および図11についても同様。)。図5(b-1)は、1群枠10の内周面の展開図、図5(b-2)は、(b-1)におけるB-B断面図である(以下、図7、図9、図10および図11についても同様。)。 FIGS. 5 (a-1) to 5 (b-2) are diagrams showing the cam 53 and the cam follower 11 of this embodiment. Specifically, FIG. 5 (a-1) is a developed view of the outer peripheral surface of the cam frame 50, and FIG. 5 (a-2) is a cross-sectional view taken along the line AA in (a-1) (hereinafter referred to as FIG. 5). The same applies to FIG. 7, FIG. 9, FIG. 10, and FIG. 5 (b-1) is a development view of the inner peripheral surface of the first group frame 10, and FIG. 5 (b-2) is a cross-sectional view taken along the line BB in (b-1) (hereinafter, FIG. 7, FIG. The same applies to 9, 10, and 11.)
 図6(a)および図6(b)は、本実施形態のカム53とカムフォロワ11との係合関係を示す図である。図6(a)は、通常時のカム53とカムフォロワ11との係合状態を示す断面図、図6(b)は、外力Fが加わった時のカム53とカムフォロワ11との係合状態を示す断面図である(以下、図8についても同様。)。
 本実施形態のカム枠50は、図5(a-1)、図5(a-2)に示すように、カムフォロワ11と係合されるカム53を有している。
FIG. 6A and FIG. 6B are diagrams showing the engagement relationship between the cam 53 and the cam follower 11 of this embodiment. 6A is a cross-sectional view showing an engagement state between the cam 53 and the cam follower 11 in a normal state, and FIG. 6B shows an engagement state between the cam 53 and the cam follower 11 when an external force F is applied. FIG. 8 is a cross-sectional view (the same applies to FIG. 8).
The cam frame 50 of the present embodiment includes a cam 53 that is engaged with the cam follower 11 as shown in FIGS. 5 (a-1) and 5 (a-2).
 カム53は、溝の深さが浅く溝の幅が広い第1カム53aと、溝の幅が第1カム53aよりも狭い第2カム53bと、を有している。
 第2カム53bは、第1カム53aと重なる位置に配置されており、第1カム53aの底面(図5(a-2)中の上下方向に沿った面)からより深い位置まで形成されている。第2カム53bの中心線BXは、第1カム53aの中心線AXより像面側に設けられている。
The cam 53 includes a first cam 53a having a shallow groove and a wide groove, and a second cam 53b having a groove that is narrower than the first cam 53a.
The second cam 53b is disposed at a position overlapping the first cam 53a, and is formed from the bottom surface of the first cam 53a (the surface along the vertical direction in FIG. 5 (a-2)) to a deeper position. Yes. The center line BX of the second cam 53b is provided on the image plane side with respect to the center line AX of the first cam 53a.
 つまり、第2カム53bの曲率中心は、第1カム53aの曲率中心より像面側に設けられている。また、光軸方向の断面における第1カム53aを形成する互いに対向する2つの側面によって形成される角度αは、光軸方向に沿った断面における第2カム53bを形成する互いに対向する2つの側面によって形成される角度βよりも小さい。
 本実施形態の1群枠10のカムフォロワ11は、図5(b-1)、図5(b-2)に示すように、1群枠10の内径から半径方向に突出した第1カムフォロワ11aと、第1カムフォロワ11aの上面(図5(b-2)中の上下方向に沿った面)からさらに1群枠の半径方向に突出した第2カムフォロワ11bと、を有している。
That is, the center of curvature of the second cam 53b is provided closer to the image plane than the center of curvature of the first cam 53a. In addition, the angle α formed by the two opposing side surfaces that form the first cam 53a in the cross section in the optical axis direction is the two side surfaces that form the second cam 53b in the cross section along the optical axis direction. Is smaller than the angle β formed by.
As shown in FIGS. 5B-1 and 5B-2, the cam follower 11 of the first group frame 10 of the present embodiment includes a first cam follower 11a protruding in the radial direction from the inner diameter of the first group frame 10. The second cam follower 11b further protrudes in the radial direction of the first group frame from the upper surface of the first cam follower 11a (the surface along the vertical direction in FIG. 5B-2).
 第1カムフォロワ11aは、図5(b-1)、図5(b-2)に示すように、円柱形状をしている。第2カムフォロワ11bは、図5(b-1)、図5(b-2)に示すように、円錐台形状をしている。
 また、円柱状の第2カムフォロワ11bの直径は、円錐台形状の第1カムフォロワ11aの直径より小さい。すなわち、第1カムフォロワ11aは、図5(b-2)に示すように、第2カムフォロワ11bよりも断面積が大きい。
The first cam follower 11a has a cylindrical shape as shown in FIGS. 5 (b-1) and 5 (b-2). The second cam follower 11b has a truncated cone shape as shown in FIGS. 5 (b-1) and 5 (b-2).
In addition, the diameter of the cylindrical second cam follower 11b is smaller than the diameter of the truncated cone-shaped first cam follower 11a. That is, the first cam follower 11a has a larger sectional area than the second cam follower 11b, as shown in FIG. 5 (b-2).
 第1カムフォロワ11aの高さと第2カムフォロワ11bの高さとは、ほぼ同一に形成されている。第1カムフォロワ11aと第2カムフォロワ11bとは、光軸方向における像面側の端面がほぼ同一面上になるように配置されている。
 第2カム53bは、図5(a-1)、図5(a-2)に示すように、カム枠50の内周面の光軸方向における領域内に形成されている。つまり、第2カム53bは、カム枠50の内周面におけるほとんどの領域において、互いに対向する側面を持っている。
The height of the 1st cam follower 11a and the height of the 2nd cam follower 11b are formed substantially the same. The first cam follower 11a and the second cam follower 11b are arranged so that the end surfaces on the image plane side in the optical axis direction are substantially on the same plane.
The second cam 53b is formed in a region in the optical axis direction of the inner peripheral surface of the cam frame 50, as shown in FIGS. 5 (a-1) and 5 (a-2). That is, the second cam 53b has side surfaces that face each other in almost all regions on the inner peripheral surface of the cam frame 50.
 一方、第1カム53aは、最も被写体側の端部に形成された部分が、カム枠50の内周面の光軸方向における領域からはみ出している。つまり、第2カム53bは、像面側の端部から被写体側の端部に至るまでの距離を、第2カム53aよりも長く確保することができる。そのため、カム枠50の光軸方向の長さが同じ場合、第1カム53aよりも第2カム53bの方がストローク量を大きく取ることができる。 On the other hand, the portion of the first cam 53a that is formed at the end closest to the subject protrudes from the region of the inner peripheral surface of the cam frame 50 in the optical axis direction. That is, the second cam 53b can ensure a longer distance from the end on the image plane side to the end on the subject side than the second cam 53a. Therefore, when the length of the cam frame 50 in the optical axis direction is the same, the second cam 53b can take a larger stroke than the first cam 53a.
 よって、本実施形態では、第2カム53bおよび円柱状の直径の小さい第2カムフォロワ11bによって、必要なストローク量を確保している。
 一方、カム53のストロークを同一に設計した場合、本実施形態では、カム枠50の光軸方向の長さを短くすることができる。このため、レンズ鏡筒100を収納した状態での光軸方向の長さを従来よりも小さくすることができる。
Therefore, in this embodiment, the necessary stroke amount is ensured by the second cam 53b and the second cam follower 11b having a small cylindrical diameter.
On the other hand, when the stroke of the cam 53 is designed to be the same, in this embodiment, the length of the cam frame 50 in the optical axis direction can be shortened. For this reason, the length in the optical axis direction in a state in which the lens barrel 100 is housed can be made smaller than the conventional one.
 しかしながら、カム53の幅を狭くすると、必然的に対応するカムフォロワ11の直径も小さくなり、外力が加わった場合、カムフォロワ11が破壊され易くなってしまう。
 そこで、本実施形態では、直径の大きい第1カムフォロワ11aと、直径の小さい第2カムフォロワ11bとが2段に重ねられて、カムフォロワ11が構成されている。
 これにより、第2カムフォロワ11bよりも直径の大きい第1カムフォロワ11aにおいて外力が加わった場合の力を受け止めることができるため、カムフォロワ11が破壊されることを抑制できる。
However, when the width of the cam 53 is narrowed, the corresponding cam follower 11 is inevitably reduced in diameter, and when an external force is applied, the cam follower 11 is easily broken.
Therefore, in the present embodiment, the cam follower 11 is configured by stacking the first cam follower 11a having a large diameter and the second cam follower 11b having a small diameter in two stages.
Thereby, since the force when external force is added in the 1st cam follower 11a with a larger diameter than the 2nd cam follower 11b can be received, it can suppress that the cam follower 11 is destroyed.
 さらに、本実施形態のレンズ鏡筒100は、図6(a)および図6(b)に示すように、大きな外力Fが加わった場合でも、第1カムフォロワ11aが第1カム53aから半径方向にずれて脱落してしまうことを抑制することができる。
 図6(b)に示すように、大きな力Fが加わった場合には、1群枠10が半径方向にずれ、カム枠50から脱落しかかる。しかし、本実施形態のレンズ鏡筒100では、第2カムフォロワ11bが、第1カム53aに引っ掛かる為、大きな外力Fが加えられた場合でも、カムフォロワ11がカム53から脱落し難い構成となっている。
Further, as shown in FIGS. 6A and 6B, the lens barrel 100 of the present embodiment has the first cam follower 11a in the radial direction from the first cam 53a even when a large external force F is applied. It can suppress that it slips and drops.
As shown in FIG. 6B, when a large force F is applied, the first group frame 10 is displaced in the radial direction and falls off the cam frame 50. However, in the lens barrel 100 of the present embodiment, since the second cam follower 11b is caught by the first cam 53a, the cam follower 11 is difficult to drop off from the cam 53 even when a large external force F is applied. .
 以上により、本実施形態のレンズ鏡筒100は、光軸方向の長さを大きくすることなく、外力に対する強度を従来よりも向上させることができる。
 図6(a)および図6(b)に示すように、光軸方向の断面における第1カムフォロワ11aの互いに対向する2つの側面によって形成される角度αは、光軸方向の断面における第2カムフォロワ11bの互いに対向する2つの側面によって形成される角度βよりも小さい。つまり、第2カムフォロワ11bの側面は、第1カムフォロワ11aの側面よりも傾斜している。
As described above, the lens barrel 100 of the present embodiment can improve the strength against the external force as compared with the related art without increasing the length in the optical axis direction.
As shown in FIGS. 6A and 6B, the angle α formed by the two opposite side surfaces of the first cam follower 11a in the cross section in the optical axis direction is the second cam follower in the cross section in the optical axis direction. It is smaller than the angle β formed by the two side surfaces of 11b facing each other. That is, the side surface of the second cam follower 11b is inclined with respect to the side surface of the first cam follower 11a.
 また、第1カム53aと第1カムフォロワ11aとの間には、図6(a)に示すように、僅かな隙間Wが設けられている。通常の使用状態では、第1カム53aと第1カムフォロワ11aとは摺動せず、第2カム53bと第2カムフォロワ11bとが摺動している。
 一方、1群枠10に外力Fが加わった場合、第2カムフォロワ11bは、第2カム53bの傾斜した側面を滑り、第1カムフォロワ11aが第1カム53aに接触する。
In addition, a slight gap W is provided between the first cam 53a and the first cam follower 11a as shown in FIG. In a normal use state, the first cam 53a and the first cam follower 11a do not slide, and the second cam 53b and the second cam follower 11b slide.
On the other hand, when an external force F is applied to the first group frame 10, the second cam follower 11b slides on the inclined side surface of the second cam 53b, and the first cam follower 11a contacts the first cam 53a.
 これにより、カムフォロワ11がカム53から外れたり、カムフォロワ11が破損したりすることを抑制することができる。
 また、通常使用時、第1カムフォロワ11aは、隙間Wにより、第1カム53aと摺動していない。そのため、カムフォロワ11が光軸方向において移動した場合には、第1カム53aと第1カムフォロワ11aとが引っ掛かることを抑制することができる。また、カムフォロワ11が最も被写体側に移動した場合には、第1カム53aの被写体側の側面が無くなる。そのため、カム53とカムフォロワ11との間にガタつきが生じることを抑制することができる。
Thereby, it can suppress that the cam follower 11 remove | deviates from the cam 53, or the cam follower 11 is damaged.
Further, during normal use, the first cam follower 11a does not slide with the first cam 53a due to the gap W. Therefore, when the cam follower 11 moves in the optical axis direction, it is possible to suppress the first cam 53a and the first cam follower 11a from being caught. Further, when the cam follower 11 is moved to the most object side, the side surface on the object side of the first cam 53a is lost. Therefore, it is possible to suppress the backlash between the cam 53 and the cam follower 11.
 なお、隙間Wは、通常使用状態において、第1カムフォロワ11aが第1カム53aに接触しない最小限の寸法、例えば、0.01~0.05mm程度にすることが望ましい。このように、隙間Wを最小限にすることにより、外力Fが加わった場合でも、第1カムフォロワ11aよりも小さい部品である第2カムフォロワ11bにかかる加重を軽減し、第2カムフォロワ11bが断裂したり、変形したりすることを抑制することができる。 The gap W is desirably set to a minimum dimension in which the first cam follower 11a does not come into contact with the first cam 53a in a normal use state, for example, about 0.01 to 0.05 mm. In this way, by minimizing the gap W, even when an external force F is applied, the load applied to the second cam follower 11b, which is a component smaller than the first cam follower 11a, is reduced, and the second cam follower 11b is torn. Or deformation.
 以下、ここに開示された技術の効果について、図7(a-1)~図7(b-2)および図8(a)および図8(b)を用いて説明する。
 図7(a-1)~図7(b-2)は、比較例としてのカム153とカムフォロワ111を示す図である。図7(a-1)は、カム枠150の外周面の展開図、図7(a-2)は、図7(a-1)のA-A断面図である。
The effects of the technique disclosed herein will be described below with reference to FIGS. 7 (a-1) to 7 (b-2), FIG. 8 (a), and FIG. 8 (b).
FIGS. 7A-1 to 7B-2 are views showing a cam 153 and a cam follower 111 as comparative examples. FIG. 7A-1 is a development view of the outer peripheral surface of the cam frame 150, and FIG. 7A-2 is a cross-sectional view taken along the line AA in FIG. 7A-1.
 図7(b-1)は、1群枠110の内周面の展開図、図7(b-2)は、図7(b-1)のB-B断面図である。
 図8(a)および図8(b)は、比較例としてのカム153とカムフォロワ111との係合関係を示す図である。図8(a)は、通常時のカム153とカムフォロワ111との係合状態を示す断面図、図8(b)は、外力Fが加わった時のカム153とカムフォロワ111との係合状態を示す断面図である。
FIG. 7B-1 is a development view of the inner peripheral surface of the first group frame 110, and FIG. 7B-2 is a cross-sectional view taken along line BB in FIG. 7B-1.
FIGS. 8A and 8B are diagrams showing an engagement relationship between a cam 153 and a cam follower 111 as a comparative example. FIG. 8A is a cross-sectional view showing the engagement state between the cam 153 and the cam follower 111 in a normal state, and FIG. 8B shows the engagement state between the cam 153 and the cam follower 111 when an external force F is applied. It is sectional drawing shown.
 図7(a-1)および図7(a-2)において、比較例のカム153は、本実施形態にかかる第1カム53aと第2カム53bと形状は同じであるが、配置関係が異なる。
 つまり、本実施形態では、第2カム53bの中心線BXは、第1カム53aの中心線AXより像面側に設けられているのに対し、比較例では第1カム153aと、第2カム153bの中心線は同じ位置に配置されている。
7 (a-1) and 7 (a-2), the cam 153 of the comparative example has the same shape as the first cam 53a and the second cam 53b according to the present embodiment, but has a different arrangement relationship. .
That is, in the present embodiment, the center line BX of the second cam 53b is provided closer to the image plane side than the center line AX of the first cam 53a, whereas in the comparative example, the first cam 153a and the second cam The center line of 153b is arranged at the same position.
 図7(b-1)および図7(b-2)において、比較例の1群枠110のカムフォロワ111は、第1カムフォロワ111aと第2カムフォロワ111bと形状は同じであるが、配置関係が異なる。つまり、第1カムフォロワ111aの中心と第2カムフォロワ111bの中心とは、同軸に形成されている。そのため、第1カムフォロワ111aと第2カムフォロワ111bとの最も像面側の輪郭には寸法L分の段差がある。 7 (b-1) and 7 (b-2), the cam follower 111 of the first group frame 110 of the comparative example has the same shape as the first cam follower 111a and the second cam follower 111b, but the arrangement relationship is different. . That is, the center of the first cam follower 111a and the center of the second cam follower 111b are formed coaxially. Therefore, there is a step corresponding to the dimension L in the contour on the most image plane side between the first cam follower 111a and the second cam follower 111b.
 図5(a-1)~図5(b-2)と図7(a-1)~図7(b-2)とを比較すれば分かるように、比較例の1群枠110は、本実施形態の1群枠10と比較して、寸法L分だけ光軸方向に長くなる。よって、1群枠110が長いと、1群枠110の長さを他の部分で吸収する必要があり、レンズ鏡筒を収納した状態の光軸方向寸法も長くなる。よって、本実施形態では、1群枠10の光軸方向の長さを、比較例にかかる1群枠110の光軸方向の長さと比べて短くすることができる。 As can be seen by comparing FIGS. 5 (a-1) to 5 (b-2) and FIGS. 7 (a-1) to 7 (b-2), the first group frame 110 of the comparative example is Compared to the first group frame 10 of the embodiment, the length becomes longer in the optical axis direction by the dimension L. Therefore, if the first group frame 110 is long, it is necessary to absorb the length of the first group frame 110 by other portions, and the dimension in the optical axis direction in a state in which the lens barrel is housed is also increased. Therefore, in this embodiment, the length of the first group frame 10 in the optical axis direction can be made shorter than the length of the first group frame 110 according to the comparative example in the optical axis direction.
 また、レンズ鏡筒100には、一般的に、例えば、1群枠10レンズ鏡筒100を搭載したカメラが撮影時に落とされたとき等において、最も被写体側に位置する1群枠10を像面側に押し込む方向に大きな外力Fが加わるが場合が多い。
 ここで、図8(a)および図8(b)を用いて、比較例の構成において、1群枠110に大きな外力Fが加わった場合について考察する。
In addition, the lens barrel 100 generally includes the first group frame 10 positioned closest to the subject side when, for example, a camera equipped with the first group frame 10 lens barrel 100 is dropped during shooting. In many cases, a large external force F is applied in the direction of pushing to the side.
Here, the case where a large external force F is applied to the first group frame 110 in the configuration of the comparative example will be considered with reference to FIGS. 8A and 8B.
 第1カムフォロワ111aは、外力Fを受けると第1カム153aから半径方向にずれ、第1カム153aから脱落しかかる。この状態で更に大きな外力Fが加わると、カムフォロワ111がカム153から脱落してしまう。
 一方、本実施形態のレンズ鏡筒100では、比較例と同じ大きさの外力Fが加わったとしても、比較例と比べて、上述のように、カムフォロワ11がカム53から脱落し難い構成となっている。
When the first cam follower 111a receives an external force F, the first cam follower 111a is displaced from the first cam 153a in the radial direction, and falls off the first cam 153a. If a larger external force F is applied in this state, the cam follower 111 falls off the cam 153.
On the other hand, in the lens barrel 100 of the present embodiment, even when an external force F having the same magnitude as that of the comparative example is applied, the cam follower 11 is less likely to drop off from the cam 53 as described above as compared to the comparative example. ing.
 つまり、第1カムフォロワ11aが第1カム53aから半径方向にずれ、脱落しかかっても、第2カムフォロワ11bが、第1カム53aに引っ掛かるためである。
 大きな外力Fに対してカムフォロワ11が脱落し難い効果を最大限に発揮するためには、第2カムフォロワ11bが第1カムフォロワ11aの最も像面側の位置に設置されていることが望ましい。つまり、第2カムフォロワ11bと、第1カムフォロワ11aの最も像面側の光軸方向高さは、ほぼ同一高さに設けられていることが望ましい。
That is, even if the first cam follower 11a is displaced in the radial direction from the first cam 53a and is about to fall off, the second cam follower 11b is caught by the first cam 53a.
In order to maximize the effect that the cam follower 11 is unlikely to drop off with respect to a large external force F, it is desirable that the second cam follower 11b be installed at the position closest to the image plane of the first cam follower 11a. That is, it is desirable that the height of the second cam follower 11b and the first cam follower 11a closest to the image plane in the optical axis direction is substantially the same.
 以上の構成により、本実施形態のレンズ鏡筒100は、光軸方向の長さを短くしながら、外力に対する強度を向上させることができる。
 (他の実施の形態)
 以下、ここに開示された技術に係る他の実施形態について、説明する。
 [1.他の実施の形態のレンズ鏡筒の構成]
 他の実施の形態に係るレンズ鏡筒100は、カムフォロワ11とカム53の構成以外は、本実施形態のレンズ鏡筒100の構成と同じであるため、以下では詳細な説明を省略する。なお、本実施形態に係るレンズ鏡筒100の構成は、一例に過ぎないため、他の構成を採用してもよい。
With the above configuration, the lens barrel 100 of the present embodiment can improve the strength against external force while shortening the length in the optical axis direction.
(Other embodiments)
Hereinafter, other embodiments according to the technology disclosed herein will be described.
[1. Configuration of Lens Barrel of Other Embodiment]
Since the lens barrel 100 according to another embodiment is the same as the configuration of the lens barrel 100 of the present embodiment except for the configuration of the cam follower 11 and the cam 53, detailed description thereof will be omitted below. Note that the configuration of the lens barrel 100 according to the present embodiment is merely an example, and other configurations may be employed.
 [2.実施の形態2]
 図9(a-1)~図9(b-2)は、本実施形態のカム53とカムフォロワ11を示す図である。
 図9(a-1)~図9(b-2)に示すように、本実施形態では、第1カムフォロワ11aは、断面視において円錐台形状を有している。
[2. Second Embodiment]
FIGS. 9A-1 to 9B-2 are views showing the cam 53 and the cam follower 11 of this embodiment.
As shown in FIGS. 9 (a-1) to 9 (b-2), in the present embodiment, the first cam follower 11a has a truncated cone shape in a sectional view.
 第2カムフォロワ11bは、円柱状の一部の円弧部分を光軸方向に折り返して重ねた形状を有している。第2カムフォロワ11bの像面側斜面は、第1カムフォロワ11aの斜面と連続した面になっている。
 第2カム53bの中心線BXは、第1カム53aの中心線AXより像面側に設けられていることは、上述した実施の形態1と同様である。
The second cam follower 11b has a shape in which a part of a circular arc portion in a columnar shape is folded back in the optical axis direction and overlapped. The slope on the image plane side of the second cam follower 11b is a surface that is continuous with the slope of the first cam follower 11a.
The center line BX of the second cam 53b is provided on the image plane side with respect to the center line AX of the first cam 53a, as in the first embodiment.
 本実施形態のカムフォロワ11の形状は、上記実施の形態1のカムフォロワ11の形状と若干異なるものの、同様の作用・効果を有する。
 なお、実施の形態1,2では、2種類のカムフォロワ11の形状について説明した。しかし、本技術は、図示はしないが、その他の形状を採用することも可能であり、設計に応じて適切な形状を選定すればよい。
Although the shape of the cam follower 11 of the present embodiment is slightly different from the shape of the cam follower 11 of the first embodiment, it has the same operations and effects.
In the first and second embodiments, the shapes of the two types of cam followers 11 have been described. However, although this technique is not illustrated, other shapes can be adopted, and an appropriate shape may be selected according to the design.
 以上の構成により、本実施形態のレンズ鏡筒100は、光軸方向の長さを従来よりも短くしながら、外力に対する強度も向上させることができる。
 [3.実施の形態3]
 図10(a-1)~図10(b-2)は、本実施形態のカム53とカムフォロワ11を示す図である。
With the above configuration, the lens barrel 100 of the present embodiment can improve the strength against external force while shortening the length in the optical axis direction as compared with the conventional one.
[3. Embodiment 3]
FIGS. 10A-1 to 10B-2 are views showing the cam 53 and the cam follower 11 of this embodiment.
 図10(a-1)および図10(a-2)に示すように、本実施形態のカム枠の第2カム53bの形状は、上記実施の形態1の第2カム53bと同一である。
 しかし、本実施形態のカム53は、1群枠10が外力F(図6(a)等参照)を受けた時にカムフォロワ11と接触する第1カム53aと、少なくとも第1カム53aの被写体側に設けられた薄肉部54とを有する点で、上記実施の形態1とは異なっている。
As shown in FIGS. 10A-1 and 10A-2, the shape of the second cam 53b of the cam frame of the present embodiment is the same as that of the second cam 53b of the first embodiment.
However, the cam 53 of the present embodiment has a first cam 53a that comes into contact with the cam follower 11 when the first group frame 10 receives an external force F (see FIG. 6A and the like), and at least on the subject side of the first cam 53a. It differs from the said Embodiment 1 by the point which has the thin part 54 provided.
 薄肉部54は、第1カム53aの部分において、被写体側に側面(カム面)を有しておらず、像面側にのみ側面(カム面)を有している。第1カム53aの像面側の側面の形状は、上記実施の形態1と同一である。
 この構成により、カム枠50における第1カム53aより被写体側には、薄肉部54が設けられており、カム枠50における第1カム53aより像面側には薄肉部54よりも断面厚さが大きい厚肉部55が設けられている。
The thin portion 54 does not have a side surface (cam surface) on the subject side in the portion of the first cam 53a, and has a side surface (cam surface) only on the image surface side. The shape of the side surface on the image surface side of the first cam 53a is the same as that in the first embodiment.
With this configuration, the thin portion 54 is provided on the subject side of the cam frame 50 from the first cam 53a, and the cross-sectional thickness of the cam frame 50 is closer to the image surface than the first cam 53a than the thin portion 54. A large thick portion 55 is provided.
 つまり、本実施形態のカム枠50は、他の領域より厚みの薄い薄肉部54と、薄肉部54の像面側に設けられ薄肉部54よりもさらにカム枠50の厚みが小さい第2カム53bと、を有する。
 本実施形態のカムフォロワ11は、図10(b-1)および図10(b-2)に示すように、第2カムフォロワ11bの形状が上記実施の形態1の第2カムフォロワ11bの形状とほぼ同一である。
That is, the cam frame 50 of the present embodiment includes a thin portion 54 that is thinner than other regions, and a second cam 53b that is provided on the image plane side of the thin portion 54 and has a cam frame 50 that is thinner than the thin portion 54. And having.
As shown in FIGS. 10 (b-1) and 10 (b-2), the cam follower 11 of the present embodiment has a shape that is substantially the same as the shape of the second cam follower 11b of the first embodiment. It is.
 しかし、本実施形態では、カムフォロワ11は、第1カム53aと接触する第1カムフォロワ11aと、第2カム53bに対向する領域より被写体側に設けられており他の部分と比較して厚肉化された補強部12と、を有している。
 第2カムフォロワ11bは、第1カムフォロワ11aからさらに半径方向に突出するように形成されており、第2カム53bと係合される。
However, in the present embodiment, the cam follower 11 is provided on the subject side from the region facing the first cam follower 11a that contacts the first cam 53a and the second cam 53b, and is thicker than the other portions. And a reinforced portion 12.
The second cam follower 11b is formed so as to protrude further in the radial direction from the first cam follower 11a, and is engaged with the second cam 53b.
 この構成により、本実施形態では、上記実施の形態1の構成と比較して、他の部分よりも厚みの大きい補強部12を含んでいるため、1群枠10の強度を向上させることができる。そして、1群枠10の強度が向上すると、1群枠10が変形し難くなるので、1群枠10に対して同じ外力F(図6(a)等参照)が加わった場合でも、本実施形態のカムフォロワ11の方が、上記実施の形態1のカムフォロワ11よりも、カム53から脱落し難くすることができる。 With this configuration, the strength of the first group frame 10 can be improved because the present embodiment includes the reinforcing portion 12 that is thicker than the other portions as compared with the configuration of the first embodiment. . When the strength of the first group frame 10 is improved, the first group frame 10 becomes difficult to be deformed. Therefore, even when the same external force F (see FIG. 6A, etc.) is applied to the first group frame 10, the present embodiment is implemented. The cam follower 11 of the form can be more difficult to drop off from the cam 53 than the cam follower 11 of the first embodiment.
 以上の構成により、本実施形態のレンズ鏡筒100は、光軸方向の長さを短くしながら、外力に対する強度を向上させることができる。
 [4.実施の形態4]
 図11(a-1)~図11(b-2)は、本実施形態のカム53とカムフォロワ11とを示す図である。
With the above configuration, the lens barrel 100 of the present embodiment can improve the strength against external force while shortening the length in the optical axis direction.
[4. Embodiment 4]
FIGS. 11 (a-1) to 11 (b-2) are views showing the cam 53 and the cam follower 11 of this embodiment.
 図11(a-1)および図11(a-2)に示すよう、本実施形態のカム53では、第2カム53bの形状は、上記実施の形態1および上記実施の形態3とほぼ同一である。
 また、本実施形態のカム53は、1群枠10に対して外力F(図6(a)等参照)を受けた時にカムフォロワ11と接触する第1カム53aと、少なくとも第1カム53aの被写体側に設けられた薄肉部54とを有する点では、上記実施の形態3と同様である。
As shown in FIGS. 11 (a-1) and 11 (a-2), in the cam 53 of the present embodiment, the shape of the second cam 53b is substantially the same as in the first embodiment and the third embodiment. is there.
Further, the cam 53 of the present embodiment includes a first cam 53a that contacts the cam follower 11 when an external force F (see FIG. 6A, etc.) is applied to the first group frame 10, and at least the subject of the first cam 53a. The third embodiment is the same as the third embodiment in that it has a thin portion 54 provided on the side.
 しかし、本実施形態のカムフォロワ11は、第1カムフォロワ11aと、第2カムフォロワ11bの外径が同じである点において、上記実施の形態3のカムフォロワ11とは異なる。
 また、本実施形態のカムフォロワ11は、上記実施の形態3のカムフォロワ11と比較して、第2カムフォロワ11b周辺の補強部12が小さい。
However, the cam follower 11 of the present embodiment is different from the cam follower 11 of the third embodiment in that the outer diameters of the first cam follower 11a and the second cam follower 11b are the same.
Further, the cam follower 11 of the present embodiment has a smaller reinforcing portion 12 around the second cam follower 11b than the cam follower 11 of the third embodiment.
 本実施形態の1群枠10は、上記実施の形態1の1群枠10と比較して、補強部12が設けられているため、外力に対する強度をより効果的に向上させることができる。
 また、本実施形態のカム枠50では、像面側のカム面において、第1カム53aのカム面と第2カム53bのカム面との間に段差が無い形状にできるため、加工が容易である。
 以上の構成により、本実施形態のレンズ鏡筒100は、光軸方向の長さを短くしながら、外力に対する強度を向上させることができる。
Compared with the first group frame 10 of the first embodiment, the first group frame 10 of the present embodiment is provided with the reinforcing portion 12, and therefore can more effectively improve the strength against external force.
Further, in the cam frame 50 of the present embodiment, the cam surface on the image surface side can be formed into a shape having no step between the cam surface of the first cam 53a and the cam surface of the second cam 53b. is there.
With the above configuration, the lens barrel 100 of the present embodiment can improve the strength against external force while shortening the length in the optical axis direction.
 (まとめ)
 [1.第1の構成]
 本実施形態のレンズ鏡筒100は、略円筒状の固定枠30と、固定枠30の内周に配置された略円筒状のカム枠50(移動枠の一例)と、固定枠30に対してカム枠50を回転駆動させる駆動機構70と、を備えている。
(Summary)
[1. First Configuration]
The lens barrel 100 of the present embodiment has a substantially cylindrical fixed frame 30, a substantially cylindrical cam frame 50 (an example of a moving frame) disposed on the inner periphery of the fixed frame 30, and the fixed frame 30. And a drive mechanism 70 that rotationally drives the cam frame 50.
 固定枠30は、カム枠50の回転に伴ってカム枠50を回転軸方向に案内する複数の案内突起31を内周面に有している。
 駆動機構70は、複数の駆動ギア72を有している。
 カム枠50は、複数の駆動ギア72と噛み合う被駆動ギア部52と、案内突起31とは噛み合うが複数の駆動ギア72とは噛み合わない案内溝51と、を外周面に有している。
The fixed frame 30 has a plurality of guide protrusions 31 on the inner peripheral surface for guiding the cam frame 50 in the direction of the rotation axis as the cam frame 50 rotates.
The drive mechanism 70 has a plurality of drive gears 72.
The cam frame 50 has a driven gear portion 52 that meshes with the plurality of drive gears 72 and a guide groove 51 that meshes with the guide protrusion 31 but does not mesh with the plurality of drive gears 72 on the outer peripheral surface.
 被駆動ギア部52は、案内溝51が設けられた欠歯部52aを含む。
 駆動機構70は、使用状態においては、複数の駆動ギア72のうちの少なくとも1つの駆動ギア72が被駆動ギア部52と噛み合うように構成されている。
 この構成により、カム枠50に設けられた被駆動ギア部52と案内溝51とが重ねて配置された場合でも、複数の駆動ギア72のうちの少なくとも1つが必ず被駆動ギア部52に噛み合う状態を維持できる。このため、欠歯部52aの部分に駆動ギア72の1つが来た場合でも、移動枠が空回りしてしまうことを回避しつつ、光軸方向の大きさが小さいレンズ鏡筒を提供することができる。
The driven gear portion 52 includes a missing tooth portion 52 a provided with a guide groove 51.
The drive mechanism 70 is configured such that at least one of the plurality of drive gears 72 meshes with the driven gear portion 52 in the use state.
With this configuration, even when the driven gear portion 52 provided on the cam frame 50 and the guide groove 51 are arranged so as to overlap each other, at least one of the plurality of driving gears 72 always meshes with the driven gear portion 52. Can be maintained. For this reason, it is possible to provide a lens barrel having a small size in the optical axis direction while avoiding that the moving frame is idle even when one of the drive gears 72 comes to the portion of the missing tooth portion 52a. it can.
 ここに開示された技術は、カメラ機能を有する装置、例えば、カメラ、カメラ付き携帯電話、カメラ付きポータブル端末等に適用できる。 The technology disclosed herein can be applied to a device having a camera function, such as a camera, a mobile phone with a camera, a portable terminal with a camera, and the like.
 10   1群枠(移動枠)
 11   カムフォロワ
 11a  第1カムフォロワ
 11b  第2カムフォロワ
 12   補強部
 20   2群枠
 30   固定枠
 31   案内突起
 34   開口部
 40   直進枠
 50   カム枠
 51   案内溝
 52   被駆動ギア部
 52a  欠歯部
 53   カム
 53a  第1カム
 53b  第2カム
 54   薄肉部
 55   厚肉部
 60   マスターフランジ
 70   駆動機構
 72   駆動ギア
 72a  第1駆動ギア
 72b  第2駆動ギア
 71   連結ギア
100   レンズ鏡筒
10 Group 1 frame (moving frame)
DESCRIPTION OF SYMBOLS 11 Cam follower 11a 1st cam follower 11b 2nd cam follower 12 Reinforcement part 20 2nd group frame 30 Fixed frame 31 Guide protrusion 34 Opening part 40 Rectilinear frame 50 Cam frame 51 Guide groove 52 Driven gear part 52a No-tooth part 53 Cam 53a 1st cam 53b Second cam 54 Thin portion 55 Thick portion 60 Master flange 70 Drive mechanism 72 Drive gear 72a First drive gear 72b Second drive gear 71 Connecting gear 100 Lens barrel

Claims (3)

  1.  略円筒状の固定枠と、
     前記固定枠の内周に配置された略円筒状の移動枠と、
     前記固定枠に対して前記移動枠を回転駆動させる駆動機構と、
    を備え、
     前記固定枠は、前記移動枠の回転に伴って、前記移動枠を回転軸方向に案内する複数の案内突起を内周面に有し、
     前記駆動機構は、複数の駆動ギアを有し、
     前記移動枠は、前記複数の駆動ギアと噛み合う被駆動ギア部と、前記案内突起とは噛み合うが前記複数の駆動ギアとは噛み合わない案内溝と、を外周面に有し、
     前記被駆動ギア部は、前記案内溝部と重複する位置に設けられており前記案内突起と噛み合う部分を持たない欠歯部を含み、
     前記駆動機構は、使用状態において、前記複数の駆動ギアのうちの少なくとも1つの駆動ギアが前記被駆動ギア部と噛み合うように構成されている、
    レンズ鏡筒。
    A substantially cylindrical fixed frame;
    A substantially cylindrical moving frame disposed on the inner periphery of the fixed frame;
    A drive mechanism for rotating the moving frame with respect to the fixed frame;
    With
    The fixed frame has a plurality of guide protrusions on the inner peripheral surface for guiding the moving frame in the rotation axis direction as the moving frame rotates.
    The drive mechanism has a plurality of drive gears,
    The movable frame has a driven gear portion that meshes with the plurality of drive gears, and a guide groove that meshes with the guide protrusion but does not mesh with the plurality of drive gears on the outer peripheral surface,
    The driven gear portion includes a toothless portion that is provided at a position overlapping with the guide groove portion and does not have a portion that meshes with the guide protrusion,
    The drive mechanism is configured such that, in use, at least one drive gear of the plurality of drive gears meshes with the driven gear portion.
    Lens barrel.
  2.  前記駆動機構は、前記複数の駆動ギアに対して同時に噛み合う単一の連結ギアをさらに有している、
    請求項1に記載のレンズ鏡筒。
    The drive mechanism further includes a single connection gear that meshes simultaneously with the plurality of drive gears,
    The lens barrel according to claim 1.
  3.  前記複数の駆動ギアは、回転軸方向高さの異なるものが含まれている、
    請求項1または2に記載のレンズ鏡筒。
    The plurality of drive gears include ones having different heights in the rotation axis direction.
    The lens barrel according to claim 1 or 2.
PCT/JP2012/007246 2011-11-11 2012-11-12 Lens barrel WO2013069310A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011247174A JP2015018004A (en) 2011-11-11 2011-11-11 Lens barrel
JP2011-247174 2011-11-11

Publications (1)

Publication Number Publication Date
WO2013069310A1 true WO2013069310A1 (en) 2013-05-16

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ID=48289556

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WO (1) WO2013069310A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017123149A1 (en) * 2016-01-11 2017-07-20 Hope Technik Pte Ltd An apparatus and method for application of a continuous rotational force

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0593835A (en) * 1991-09-30 1993-04-16 Asahi Optical Co Ltd Rotary extending mechanism
JPH0593836A (en) * 1991-09-30 1993-04-16 Asahi Optical Co Ltd Rotary extending mechanism
JPH05346527A (en) * 1992-06-12 1993-12-27 Nikon Corp Lens barrel
JPH08114738A (en) * 1994-10-13 1996-05-07 Asahi Optical Co Ltd Rotary extending device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0593835A (en) * 1991-09-30 1993-04-16 Asahi Optical Co Ltd Rotary extending mechanism
JPH0593836A (en) * 1991-09-30 1993-04-16 Asahi Optical Co Ltd Rotary extending mechanism
JPH05346527A (en) * 1992-06-12 1993-12-27 Nikon Corp Lens barrel
JPH08114738A (en) * 1994-10-13 1996-05-07 Asahi Optical Co Ltd Rotary extending device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017123149A1 (en) * 2016-01-11 2017-07-20 Hope Technik Pte Ltd An apparatus and method for application of a continuous rotational force

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