WO2024038840A1 - レンズ鏡筒及び撮像装置 - Google Patents

レンズ鏡筒及び撮像装置 Download PDF

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Publication number
WO2024038840A1
WO2024038840A1 PCT/JP2023/029413 JP2023029413W WO2024038840A1 WO 2024038840 A1 WO2024038840 A1 WO 2024038840A1 JP 2023029413 W JP2023029413 W JP 2023029413W WO 2024038840 A1 WO2024038840 A1 WO 2024038840A1
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WO
WIPO (PCT)
Prior art keywords
lens
frame
optical axis
lens barrel
aperture
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/029413
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
福島岳寿
木ノ内有紀
合田洋吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
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 Nikon Corp filed Critical Nikon Corp
Priority to JP2024541544A priority Critical patent/JP7819775B2/ja
Publication of WO2024038840A1 publication Critical patent/WO2024038840A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • the lens barrel has an aperture portion that adjusts the amount of light passing through the lens barrel, and at least one lens, and a first lens barrel that engages with a first guide bar that extends in the optical axis direction.
  • a first frame including an engaging portion, and the aperture portion, the lens, and the first frame move integrally in the optical axis direction.
  • the imaging device includes the above lens barrel.
  • configurations of the embodiments described below may be modified as appropriate, and at least a portion thereof may be replaced with other components.
  • the configuration elements whose arrangement is not particularly limited are not limited to the arrangement disclosed in the embodiments, but can be arranged at a position where the function can be achieved.
  • FIG. 1 is a schematic diagram of a camera including a lens barrel and a camera body according to a first embodiment.
  • FIG. 2 is a perspective view showing a subassembly included in the lens barrel and a drive source unit.
  • FIG. 3 is an exploded perspective view of the subassembly seen from the subject side.
  • FIG. 4 is an exploded perspective view of the subassembly seen from the image plane side.
  • 5(A) is a plan view of the subassembly seen from the subject side
  • FIG. 5(B) is a sectional view taken along the line BB in FIG. 5(A).
  • FIG. 6 is a sectional view of the lens holding frame.
  • FIG. 7 is a perspective view for explaining the intermediate frame.
  • FIG. 1 is a schematic diagram of a camera including a lens barrel and a camera body according to a first embodiment.
  • FIG. 2 is a perspective view showing a subassembly included in the lens barrel and a drive
  • FIG. 8 is a perspective view showing the subassembly and the lens holding frame of the focus lens.
  • FIG. 9(A) is a plan view of the subassembly as seen from the subject side
  • FIG. 9(B) is a plan view of the subassembly and the lens holding frame of the focus lens as seen from the subject side.
  • FIG. 10(A) is a perspective view of the subassembly according to the second embodiment as viewed from the subject side
  • FIG. 10(B) is a perspective view of the subassembly as viewed from the image plane side.
  • FIG. 11 is an exploded perspective view of the subassembly seen from the subject side.
  • FIG. 12 is an exploded perspective view of the subassembly viewed from the image plane side.
  • 13(A) is a plan view of the subassembly seen from the image plane side, and
  • FIG. 13(B) is a sectional view taken along the line AA in FIG. 13(A).
  • FIG. 1 is a schematic diagram of a camera 1 including a lens barrel 20 and a camera body 10 according to the present embodiment.
  • the lens barrel 20 can be attached to and detached from the camera body 10 using a lens mount LM.
  • the lens barrel 20 and the camera body 10 may be integrated.
  • the camera body 10 includes an image sensor IS and a control unit CU inside.
  • the image sensor IS includes a photoelectric conversion element such as a CCD (Charge Coupled Device), and converts a subject image formed by an imaging optical system (lens barrel 20 attached to the camera body 10) into an electrical signal. .
  • CCD Charge Coupled Device
  • the control unit CU includes a CPU (Central Processing Unit), etc., and performs shooting including zoom operation, focusing drive, aperture adjustment, and blur correction of captured images due to camera shake, etc. in the camera body 10 and attached lens barrel 20.
  • the overall operation of the camera 1 is generally controlled.
  • the lens barrel 20 includes a first fixed barrel 21, a second fixed barrel 22 disposed inside the first fixed barrel 21, and a zoom operation ring 23. Equipped with.
  • the first fixed barrel 21 and the second fixed barrel 22 are composed of a plurality of parts, but may be composed of one part.
  • the lens barrel 20 includes a plurality of lens groups L1 to L6 sequentially arranged along a common optical axis OA.
  • the lens groups L1 and L6 are held in a second fixed barrel 22.
  • Lens groups L2 to L5 are held by lens holding frames F2 to F5, respectively.
  • Lens groups L2 and L4 are zoom lens groups
  • lens group L3 is a vibration reduction (VR) lens group
  • lens group L5 is a focus lens group.
  • each of the lens groups L1 to L6 may be composed of one lens, or may be composed of a plurality of lenses.
  • the lens barrel 20 includes a first guide bar 25, a second guide bar 26 (not shown in FIG. 1), and a sub-guide bar 27.
  • the first guide bar 25 , the second guide bar 26 , and the sub-guide bar 27 are fixed to the second fixed cylinder 22 .
  • the first guide bar 25 guides the lens holding frame F4 in the direction of the optical axis OA
  • the second guide bar 26 guides the lens holding frame F5 in the direction of the optical axis OA.
  • the sub guide bar 27 restricts the rotation of the lens holding frame F4 about the first guide bar 25 and the rotation of the lens holding frame F5 about the second guide bar 26.
  • the lens holding frame F4 and the lens holding frame F5 share the sub guide bar 27, but a corresponding sub guide bar is provided for each of the lens holding frame F4 and the lens holding frame F5. Good too.
  • the lens barrel 20 includes a subassembly G1 that includes an aperture mechanism 30 that adjusts the amount of light flux, a correction mechanism 40 that corrects image blur, and a lens holding frame F4.
  • the subgroup G1 is driven by the first drive source unit 100.
  • the subassembly G1 and the first drive source unit 100 will be described in detail below.
  • FIG. 2 is a perspective view showing the subassembly G1 and the first drive source unit 100.
  • FIG. 3 is an exploded perspective view of the subassembly G1 seen from the subject side
  • FIG. 4 is an exploded perspective view of the subassembly G1 seen from the image plane side.
  • FIG. 5(A) is a plan view of the subassembly G1 seen from the subject side
  • FIG. 5(B) is a sectional view taken along the line BB in FIG. 5(A).
  • FIG. 6 is a sectional view of the lens holding frame F4 included in the subassembly G1.
  • Subset G1 includes an aperture mechanism 30, a correction mechanism 40, and a lens holding frame F4.
  • the diaphragm mechanism 30 is a iris diaphragm whose aperture diameter can be adjusted. As shown in FIGS. 3 and 4, the aperture mechanism 30 includes a lens holding frame F2, a plurality of aperture blades 32, a rotating frame 33, a stepping motor 34, and an intermediate frame 60.
  • the lens holding frame F2 includes a lens holding part 36 (see FIG. 3) that holds the lens group L2, and a plurality of holes 31 (see FIG. 4) formed on the image plane side surface.
  • the number of the plurality of holes 31 is the same as the number of aperture blades 32, and a support portion 32a of the aperture blade 32 is inserted into each hole 31.
  • a support portion 32a is provided on the object-side surface of each of the plurality of aperture blades 32, and a cam follower 32b is provided on the image-side surface.
  • the support portion 32a is inserted into a hole 31 provided in the lens holding frame F2, and the cam follower 32b is inserted into a cam groove 33a provided in the rotation frame 33 (see FIG. 3).
  • the rotating frame 33 is an annular member having an opening in the center, and has the same number of cam grooves 33a as the number of aperture blades 32 formed therein. As described above, the cam follower 32b of the aperture blade 32 is inserted into the cam groove 33a. Note that the cam groove 33a may be a through groove that penetrates the rotating frame 33, or may be a groove that does not penetrate the rotating frame 33.
  • a segment gear 33b is formed on the outer edge of the rotating frame 33 (see FIG. 4), and meshes with a pinion gear 34a attached to the rotating shaft of the stepping motor 34.
  • the stepping motor 34 is held by the intermediate frame 60 so as to protrude toward the lens holding frame F3.
  • the stepping motor 34 When an instruction to change the F value is issued from the camera body 10, the stepping motor 34 is driven to rotate, and the rotating frame 33 having the segment gear 33b that meshes with the pinion gear 34a attached to the rotating shaft of the stepping motor 34 rotates. .
  • the cam follower 32b of the aperture blade 32 is inserted into the cam groove 33a of the rotating frame 33, so when the rotating frame 33 rotates around the optical axis OA, the cam follower 32b of the aperture blade 32 moves into the cam groove with the support portion 32a as a fulcrum. 33a.
  • the size of the aperture of the iris diaphragm can be adjusted using the plurality of diaphragm blades 32.
  • the lens holding frame F2 may be provided with the cam groove 33a
  • the rotating frame 33 may be provided with the hole 31.
  • the correction mechanism 40 includes an intermediate frame 60, a lens holding frame F3, a pair of voice coil motors (VCM) 42a and 42b, and a lens holding frame F4.
  • VCM voice coil motors
  • the lens holding frame F3 holds the lens group L3, which is a focus lens group, and is connected to the lens holding frame F4 in the optical axis OA direction by a spring (not shown).
  • the lens holding frame F3 is driven by the VCMs 42a and 42b.
  • the VCM 42a includes a magnet 43a and a coil 44a
  • the VCM 42b includes a magnet 43b and a coil 44b.
  • the magnets 43a and 43b are held by magnet holding parts 45a and 45b of the lens holding frame F3, respectively, and the coils 44a and 44b are held by coil holding parts 52a and 52b (the coil holding part 52a is not shown) of the lens holding frame F4, respectively. be done.
  • an electromagnetic force in a direction intersecting (orthogonal to) the optical axis OA acts on the lens holding frame F3 via the magnets 43a and 43b, and the lens group L3 is integrated with the lens holding frame F3. (shake correction lens group) is shifted in that direction.
  • the lens group L3 can be shifted in two directions intersecting the optical axis OA, and the lens group L3 can be driven in all directions intersecting the optical axis OA.
  • a so-called moving magnet type VCM is used, but a moving coil type VCM in which the lens holding frame F3 holds a coil and the lens holding frame F4 holds a magnet may also be used. .
  • FIG. 7 is a perspective view for explaining the intermediate frame 60.
  • the intermediate frame 60 holds the stepping motor 34 included in the aperture mechanism 30 so that the stepping motor 34 protrudes toward the lens holding frame F3 side. Therefore, as shown in FIG. 5(B), the stepping motor 34 and the VCMs 42a and 42b overlap in the radial direction of a circle centered on the optical axis OA. In other words, a plane that includes the stepping motor 34 and is orthogonal to the optical axis OA intersects the VCMs 42a and 42b. That is, the stepping motor 34 and the VCMs 42a and 42b are not stacked in the optical axis OA direction.
  • the length of the subassembly G1 in the optical axis OA direction can be shortened compared to the case where the stepping motor 34 and the VCMs 42a and 42b do not overlap in the radial direction of a circle centered on the optical axis OA.
  • the lens barrel 20 can be downsized.
  • the aperture mechanism 30 and the correction mechanism 40 share the intermediate frame 60, the number of parts can be reduced compared to the case where the aperture mechanism 30 and the correction mechanism 40 are provided separately. parts costs can be reduced.
  • a Hall element 61 is attached to the intermediate frame 60 to detect the amount of movement of the lens holding frame F3 (lens group L3).
  • the position of the lens group L3 can be detected by using the Hall element 61 to detect the magnetic fields of the magnets 43a and 43b fixed to the lens holding frame F3.
  • the intermediate frame 60 is provided with a detection section 62 that detects that the aperture is in the open position.
  • the detection section 62 includes a light emitting section 62a that emits light, and a light receiving section 62b that receives the light emitted by the light emitting section 62a.
  • the detection unit 62 is, for example, a photointerrupter.
  • a light shielding plate 33c is provided on the outer peripheral side of the rotation frame 33 and extends toward the image plane side (see FIG. 4). As the rotating frame 33 rotates with respect to the intermediate frame 60, the light shielding plate 33c moves within the light shielding plate slit 63 (see FIGS. 3 and 7) provided in the intermediate frame 60, and the light emitting part 62a and the light receiving part 62b are connected to each other.
  • a detection circuit (not shown) detects that the aperture is in the open position.
  • the Hall element 61 and the stepping motor 34 are arranged on opposite sides of the optical axis OA. If the distance between the Hall element 61 and the stepping motor 34 is short, noise may be added to the signal from the Hall element 61 due to the influence of the magnetic field of the stepping motor 34. In this embodiment, since the Hall element 61 and the stepping motor 34 are arranged apart from each other, noise can be suppressed from being added to the signal from the Hall element 61.
  • the intermediate frame 60 is fixed to the lens holding frame F2 by inserting screws 72 into the holes 29 (see FIG. 4) formed in the lens holding frame F2.
  • the lens holding frame F2 is fixed to the lens holding frame F4 by inserting screws 71 into holes 59 (see FIG. 3, etc.) formed in the lens holding frame F4.
  • the aperture mechanism 30 is fixed to the lens holding frame F4.
  • the lens holding frame F4 has a cylindrical portion 53 that holds the lens group L4, and a first engaging portion 51 that engages with the first guide bar 25 is provided on the outer peripheral portion of the cylindrical portion 53. and a second engaging portion 54 (see FIG. 3) that engages with the sub guide bar 27.
  • the first engaging portion 51 has a first end 51a and a second end 51b that face each other in the optical axis OA direction.
  • a through hole 51c is formed in the first end 51a and the second end 51b.
  • the first guide bar 25 is inserted into the through hole 51c. By sliding the first engaging portion 51 with respect to the first guide bar 25, the lens holding frame F4 is guided in the optical axis OA direction.
  • the subassembly G1 is driven by driving the lens holding frame F4 by the first drive source unit 100.
  • the first drive source unit 100 includes a stepping motor 101, a lead screw 102, a nut 103, a rotation regulating bar 104, and a mounting member 105.
  • the mounting member 105 is fixed to the stepping motor 101 and rotatably supports the lead screw 102. As shown in FIG. 2, a plurality of holes 105a are formed in the mounting member 105, and by screwing the mounting member 105 to the second fixed cylinder 22, the first drive source unit 100 can be attached to the second fixed cylinder 22. Fixed.
  • the lead screw 102 is directly connected to the output shaft of the stepping motor 101 and is rotationally driven by the stepping motor 101.
  • the lead screw 102 extends in the optical axis OA direction, and a thread groove is formed on the outer periphery of the lead screw 102.
  • a nut 103 that surrounds the entire circumference of the lead screw 102 is engaged with the lead screw 102 .
  • the nut 103 has an engaging portion 103a that engages with the rotation restriction bar 104.
  • the rotation regulating bar 104 is supported by a support portion 51d provided on the first engaging portion 51 of the lens holding frame F4. Thereby, the rotation of the nut 103 is restricted by the rotation restriction bar 104, and when the lead screw 102 is rotated by the stepping motor 101, the nut 103 is moved straight in the optical axis OA direction.
  • a spring 110 is provided between the engaging portion 103a of the nut 103 and the supporting portion 51d of the lens holding frame F4.
  • a rotation regulating bar 104 is inserted through the spring 110 .
  • the spring 110 biases the nut 103 and the support portion 51d so that the nut 103 is pressed against the support portion 51d.
  • the lens holding frame F4 moves together with the nut 103 in the optical axis OA direction. Thereby, by rotationally driving the lead screw 102, the lens holding frame F4 can be driven in the optical axis OA direction. Since the aperture mechanism 30 is fixed to the lens holding frame F4 via the correction mechanism 40, when the lead screw 102 is rotated, the aperture mechanism 30, the correction mechanism 40, and the lens holding frame F4 are integrated. Move in the optical axis OA direction.
  • FIG. 8 is a perspective view showing the subassembly G1 and the lens holding frame F5.
  • 9(A) is a plan view of the subassembly G1 viewed from the subject side
  • FIG. 9(B) is a plan view of the subassembly G1 and the lens holding frame F5 viewed from the subject side. Note that FIG. 8 shows a state in which the subassembly G1 and the lens holding frame F5 are closest to each other.
  • the lens holding frame F5 is disposed closer to the image plane than the subassembly G1, and has a third engaging portion 91 that engages with the second guide bar 26.
  • the lens holding frame F5 is driven by, for example, a second drive source unit 200 having the same configuration as the first drive source unit 100.
  • the second drive source unit 200 includes a stepping motor, a lead screw, a nut 203, a rotation regulating bar 204, and a mounting member, but illustration of the stepping motor, lead screw, and mounting member is omitted.
  • the second drive source unit 200 is fixed to the second fixed cylinder 22, for example.
  • the subassembly G1 has an outer shape in which a part of a circle is cut out so that the third engaging portion 91 of the lens holding frame F5 can escape.
  • the third engaging portion 91 has a diameter of a circle centered on the optical axis OA. It overlaps with subgroup G1 in the direction. That is, the third engaging portion 91 overlaps with the aperture mechanism 30 and the correction mechanism 40 in the radial direction.
  • the engagement length between the third engagement portion 91 of the lens holding frame F5 and the second guide bar 26 can be increased, so that the central axis of the lens group L5 is aligned with respect to the optical axis OA. This makes it possible to suppress tilting of the lens barrel 20, thereby improving the optical performance of the lens barrel 20.
  • the lens barrel 20 includes an aperture mechanism 30 that adjusts the amount of light passing through the lens barrel 20, and a diaphragm mechanism 30 that moves in a direction intersecting the optical axis OA to correct image blur.
  • a correction mechanism 40 (more specifically, a lens group L3), and a lens holding frame F4 including a first engaging portion 51 that engages with a first guide bar 25 extending in the direction of the optical axis OA.
  • the mechanism 30, the correction mechanism 40, and the lens holding frame F4 move integrally in the optical axis OA direction.
  • a first cam follower and a second cam follower are provided on the outer periphery of the subassembly, and the first cam follower is attached to the zoom operation ring 23.
  • the second cam follower is engaged with a cam groove formed in a cam cylinder that rotates around the optical axis OA in response to an operation, and the second cam follower is engaged with a rectilinear groove that extends in the direction of the optical axis OA.
  • the cam cylinder rotates in response to the operation of the zoom operation ring 23, thereby moving the subassembly along the cam groove.
  • the rotation of the subassembly around the optical axis OA is regulated by the linear groove, and the subassembly is guided in the optical axis OA direction by the linear groove, so the subassembly is moved in the optical axis OA direction without rotating. be able to.
  • the lens barrel 20 includes a first drive source unit 100 that drives the lens holding frame F4 in the optical axis OA direction, and by driving the first drive source unit 100, the aperture mechanism 30 and the correction mechanism 40 and the lens holding frame F4 move together in the direction of the optical axis OA.
  • the aperture mechanism 30 and the correction mechanism 40 are driven by a cam groove formed in a cam cylinder and a cam follower, image skipping/image shaking occurs when the cam follower passes through a step formed on the inner wall of the cam groove. .
  • the first drive source unit 100 since the first drive source unit 100 is used to drive the subassembly G1 including the aperture mechanism 30 and the correction mechanism 40, image skipping/image shaking may occur due to the step formed in the cam groove. There is no. Thereby, the optical performance of the lens barrel 20 can be further improved. Since the first drive source unit 100 is used to drive the aperture mechanism 30 and the correction mechanism 40, which tend to affect optical performance, the optical performance of the lens barrel 20 can be further improved.
  • the lens holding frame F4 engages with the first drive source unit 100 (more specifically, the lead screw 102) and holds the nut 103 that moves in the optical axis OA direction. Since the nut 103 engages with the lead screw 102 around the entire circumference, the subassembly G1 does not move even if, for example, the camera 1 (lens barrel 20) is dropped and the lens barrel 20 receives an impact. Therefore, the impact force applied to the subassembly G1 can be reduced. Thereby, damage to the subassembly G1 can be suppressed. Furthermore, damage to other parts due to the subassembly G1 colliding with other parts can be suppressed.
  • the number of parts can be reduced, and the parts of the lens barrel 20 can be reduced. Cost can be reduced.
  • the lens barrel 20 drives a stepping motor 34 that adjusts the aperture diameter of the diaphragm mechanism 30 and a correction mechanism 40 (more specifically, the lens group L3) in a direction intersecting the optical axis OA.
  • the stepping motor 34 and the VCMs 42a and 42b overlap in the radial direction of a circle centered on the optical axis OA.
  • the lens barrel 20 includes an intermediate frame 60 that holds a stepping motor 34, and the stepping motor 34 is held by the intermediate frame 60 so as to protrude toward the correction mechanism 40 side.
  • the length of the subassembly G1 in the optical axis OA direction can be shortened compared to the case where the stepping motor 34 and the VCMs 42a and 42b do not overlap in the radial direction, so the lens barrel 20 can be made smaller. be able to.
  • the lens barrel 20 also includes a detection unit 62 that detects the open position of the diaphragm mechanism 30, and a position in the direction intersecting the optical axis OA of the correction mechanism 40 (more specifically, the lens group L3).
  • the sensor includes a Hall element 61 that detects , and an intermediate frame 60 that holds the detection section 62 and the Hall element 61 .
  • the detection section 62 in the lens holding frame F2 and the Hall element 61 in the lens holding frame F4
  • the crawling of the flexible printed circuit board becomes complicated.
  • the Hall element 61 and the detection section 62 are provided in the same component (the intermediate frame 60), it is possible to simplify the handling of the flexible printed circuit board.
  • the intermediate frame 60 holds the stepping motor 34 that adjusts the aperture diameter of the diaphragm mechanism 30, and the Hall element 61 and the stepping motor 34 are connected to the optical axis OA in a plane perpendicular to the optical axis OA. placed on the opposite side of the Thereby, the Hall element 61 and the stepping motor 34 are separated from each other, so that it is possible to suppress noise from being added to the signal.
  • the lens barrel 20 includes a screw 71 that fixes the lens holding frame F4 and the aperture mechanism 30 (more specifically, the lens holding frame F2), and the lens holding frame F4 has the screw 71. It has a hole 59 into which it is inserted.
  • the lens holding frame F4 having the first engaging portion 51 that engages with the first guide bar 25 is required to have high rigidity. This is because if the rigidity is low, the first engaging portion 51 that engages with the first guide bar 25 will be inclined with respect to the optical axis OA direction, and the optical performance will deteriorate.
  • the lens holding frame F4 Since the lens holding frame F4 has high rigidity, even if the hole 59 is provided in the lens holding frame F4 and the aperture mechanism 30 is screwed to the lens holding frame F4, the amount of deformation of the lens holding frame F4 can be small. Thereby, for example, it is possible to suppress the central axis of the lens group L4 held by the lens holding frame F4 from being tilted with respect to the optical axis OA due to deformation of the lens holding frame F4. That is, it is possible to suppress the optical performance from deteriorating. Moreover, by fixing the parts (lens holding frame F2 and lens holding frame F4) holding the lens group with the screws 71, it is possible to suppress variations in optical performance due to variations in parts.
  • the lens barrel 20 also includes a lens holding frame F5 that holds the lens group L5 that moves in the optical axis OA direction during focusing, and a second drive source that drives the lens holding frame F5 in the optical axis OA direction. It includes a unit 200 and a second guide bar 26 that guides the lens holding frame F5 in the optical axis OA direction.
  • the lens holding frame F5 has a third engaging part 91 that engages with the second guide bar 26, and when the lens holding frame F5 and the diaphragm mechanism 30 and the correction mechanism 40 are closest to each other, the third engaging part 91 engages with the second guide bar 26.
  • the aperture mechanism 30, and the correction mechanism 40 overlap in the radial direction of a circle centered on the optical axis OA. That is, the aperture mechanism 30, the correction mechanism 40, and the lens holding frame F4 have external shapes that allow the third engaging portion 91 to escape. As a result, the engagement length between the third engagement portion 91 of the lens holding frame F5 and the second guide bar 26 can be increased, thereby suppressing the central axis of the lens group L5 from being tilted with respect to the optical axis OA. Therefore, the optical performance of the lens barrel 20 can be improved.
  • the lens holding frame F2 holds the lens group L2 and the lens holding frame F4 holds the lens group L4, but the present invention is not limited to this.
  • the lens holding frame F2 does not need to hold the lens group L2.
  • the lens holding frame F4 does not need to hold the lens group L4.
  • the lens holding frame F4 had the first engaging portion 51 that engages with the first guide bar 25, but the present invention is not limited to this.
  • the intermediate frame 60A has a first engaging portion 51A that engages with the first guide bar 25 will be described.
  • FIG. 10(A) is a perspective view of the subassembly G1A according to the second embodiment viewed from the subject side
  • FIG. 10(B) is a perspective view of the subassembly G1A viewed from the image plane side
  • FIG. 11 is an exploded perspective view of the subassembly G1A viewed from the subject side
  • FIG. 12 is an exploded perspective view of the subassembly G1A viewed from the image plane side
  • FIG. 13(A) is a plan view of the subassembly G1A viewed from the image plane side
  • FIG. 13(B) is a sectional view taken along the line AA in FIG. 13(A).
  • the subassembly G1A includes an aperture mechanism 30A, a correction mechanism 40A, and an intermediate frame 60A.
  • the aperture mechanism 30A includes a lens holding frame F2A, a rotating frame 33A, a plurality of aperture blades 32, and an intermediate frame 60A.
  • the lens holding frame F2A holds the lens group L2.
  • the lens holding frame F2A is fixed to the intermediate frame 60A by inserting screws 71A into holes 69 formed in the subject side surface of the intermediate frame 60A. Thereby, the aperture mechanism 30A is fixed to the intermediate frame 60A.
  • the rotating frame 33A is an annular member having an opening in the center, and has the same number of cam grooves 33a as the number of aperture blades 32 formed on the image plane side.
  • a cam follower 32b provided on the object-side surface of the aperture blade 32 is inserted into the cam groove 33a.
  • the cam groove 33a may be a through groove that penetrates the rotating frame 33, or may be a groove that does not penetrate the rotating frame 33A.
  • a segment gear 33b is formed on the outer edge of the rotating frame 33A, and meshes with a pinion gear 34a attached to the rotating shaft of the stepping motor 34.
  • the stepping motor 34 is held by the intermediate frame 60A.
  • a support portion 32a is provided on the image plane side surface of each of the plurality of aperture blades 32, and the support portion 32a is inserted into a hole 31 provided on the subject side surface of the intermediate frame 60A.
  • the stepping motor 34 When an instruction to change the F value is issued from the camera body 10, the stepping motor 34 is driven to rotate, and the rotating frame 33A having the segment gear 33b that meshes with the pinion gear 34a attached to the rotating shaft of the stepping motor 34 rotates. .
  • the cam follower 32b of the aperture blade 32 is inserted into the cam groove 33a of the rotating frame 33A, so when the rotating frame 33A rotates around the optical axis OA, the cam follower 32b of the aperture blade 32 moves into the cam groove with the support portion 32a as a fulcrum. 33a.
  • the cam groove 33a may be provided in the intermediate frame 60A, and the hole 31 may be provided in the rotating frame 33A.
  • the correction mechanism 40A includes an intermediate frame 60A, a lens holding frame F3A, a pair of VCMs 42a and 42b, and a lens holding frame F4A.
  • the lens holding frame F3A is connected to the intermediate frame 60A in the optical axis OA direction by a spring.
  • the lens holding frame F3A is driven by the VCMs 42a and 42b.
  • the configurations of the VCMs 42a and 42b are similar to those in the first embodiment.
  • the magnets 43a and 43b are held by magnet holding parts 45a and 45b of the lens holding frame F3A, respectively, and the coils 44a and 44b are held by coil holding parts 67a and 67b of the intermediate frame 60A, respectively.
  • the length of the subassembly G1A in the optical axis OA direction can be shortened, and the lens barrel 20 can be downsized.
  • the lens holding frame F4A holds the lens group L4 and is fixed to the intermediate frame 60A by inserting the screw 72A into the hole 68 formed on the subject side of the intermediate frame 60A.
  • a Hall element 61 is provided on the image plane side surface of the lens holding frame F4 (see FIGS. 10(B) and 13(A)).
  • the intermediate frame 60A includes a first engaging portion 51A that engages with the first guide bar 25 and a second engaging portion 54A that engages with the sub guide bar 27.
  • the intermediate frame 60A is driven by the first drive source unit 100 described in the first embodiment.
  • the nut 103 that engages with the lead screw 102 moves in the optical axis OA direction
  • the intermediate frame 60A that engages with the nut 103 moves. is moved in the direction of the optical axis OA. Since the diaphragm mechanism 30A and the correction mechanism 40A are fixed to the intermediate frame 60A, when the lead screw 102 is rotationally driven, the diaphragm mechanism 30A, the correction mechanism 40A, and the intermediate frame 60A are integrally moved in the optical axis OA direction. Move to.
  • the first engaging portion 51A that engages with the first guide bar 25 may be provided in a frame that does not hold the lens group.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lens Barrels (AREA)
PCT/JP2023/029413 2022-08-15 2023-08-14 レンズ鏡筒及び撮像装置 Ceased WO2024038840A1 (ja)

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JP2022129186 2022-08-15

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009175257A (ja) * 2008-01-22 2009-08-06 Canon Inc 光学レンズ鏡筒及び撮像装置
WO2012107965A1 (ja) * 2011-02-09 2012-08-16 パナソニック株式会社 レンズ鏡筒および撮像装置
WO2021049184A1 (ja) * 2019-09-13 2021-03-18 株式会社ニコン レンズ鏡筒及び撮像装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008015159A (ja) * 2006-07-05 2008-01-24 Nikon Corp レンズ鏡筒、光学機器
JP4992478B2 (ja) * 2007-03-07 2012-08-08 株式会社ニコン ブレ補正ユニット、レンズ鏡筒、カメラ
JP6957160B2 (ja) * 2017-02-14 2021-11-02 キヤノン株式会社 レンズ装置及びそれを有する撮像装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009175257A (ja) * 2008-01-22 2009-08-06 Canon Inc 光学レンズ鏡筒及び撮像装置
WO2012107965A1 (ja) * 2011-02-09 2012-08-16 パナソニック株式会社 レンズ鏡筒および撮像装置
WO2021049184A1 (ja) * 2019-09-13 2021-03-18 株式会社ニコン レンズ鏡筒及び撮像装置

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