WO2021140989A1 - レンズ鏡筒及び光学機器 - Google Patents

レンズ鏡筒及び光学機器 Download PDF

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Publication number
WO2021140989A1
WO2021140989A1 PCT/JP2020/049133 JP2020049133W WO2021140989A1 WO 2021140989 A1 WO2021140989 A1 WO 2021140989A1 JP 2020049133 W JP2020049133 W JP 2020049133W WO 2021140989 A1 WO2021140989 A1 WO 2021140989A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
lens
optical axis
lens barrel
focus
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/JP2020/049133
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English (en)
French (fr)
Japanese (ja)
Inventor
浜崎拓司
徳川智之
入江俊幸
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 JP2021570035A priority Critical patent/JP7435630B2/ja
Publication of WO2021140989A1 publication Critical patent/WO2021140989A1/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
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • 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

Definitions

  • the present invention relates to a lens barrel and an optical device.
  • the lens barrel is required to have good optical performance (for example, Patent Document 1).
  • the lens barrel is a second cylinder having a first cylinder having a first cam groove, a first protrusion engaged with the first cam groove, and a second cam groove.
  • a lens holding frame having a third cylinder having a first straight groove along the optical axis direction, a second cam groove, and a second protrusion engaging with the first straight groove to hold the lens.
  • the lens barrel is a second cylinder having a first cylinder having a first cam groove, a first protrusion engaged with the first cam groove, and a second cam groove.
  • a lens holding frame having a third cylinder having a first straight groove along the optical axis direction, a second cam groove, and a second protrusion engaging with the first straight groove, and holding a lens.
  • the optical device includes the lens barrel.
  • the configuration of the embodiment described later may be appropriately improved, or at least a part thereof may be replaced with another configuration. Further, the configuration requirement without particular limitation on the arrangement is not limited to the arrangement disclosed in the embodiment, and can be arranged at a position where the function can be achieved.
  • FIG. 1 is a cross-sectional view of a lens barrel according to an embodiment.
  • FIG. 2 is an enlarged cross-sectional view of the vicinity of the fourth lens holding frame.
  • FIG. 3 is a schematic perspective view of the first fixed cylinder and the fourth lens holding frame.
  • FIG. 4 is a schematic perspective view of the zoom correction cam ring.
  • FIG. 5 is a schematic perspective view of the focus cam ring.
  • FIG. 6 is a schematic perspective view of the second fixed cylinder.
  • FIG. 7 is a view of the focus cam ring unfolded and viewed from the inner peripheral side.
  • FIG. 8 is a schematic perspective view of the lens barrel as viewed from above, showing the engagement relationship of each component of the lens barrel.
  • FIG. 1 is a cross-sectional view of a lens barrel according to an embodiment.
  • FIG. 2 is an enlarged cross-sectional view of the vicinity of the fourth lens holding frame.
  • FIG. 3 is a schematic perspective view of the first fixed cylinder and the fourth lens holding frame
  • FIG. 9A is a diagram showing a state of each component at the start of the zoom operation
  • FIG. 9B is a diagram for explaining the movement of each component at the time of the zoom operation
  • FIG. 10A is a diagram showing a state of each component at the start of the focus operation
  • FIG. 10B is a diagram for explaining the movement of each component at the time of the focus operation.
  • FIG. 1 is a cross-sectional view of the lens barrel 100 according to the embodiment, showing a wide-angle state above the center line and a telephoto state below the center line.
  • FIG. 2 is an enlarged cross-sectional view of the vicinity of the fourth lens holding frame 164, which will be described later.
  • the cam groove, the straight groove, and the circumferential groove may be omitted in FIGS. 1 and 2.
  • the lens barrel 100 has a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L1, which are sequentially arranged along a common optical axis OA. It includes a lens group L4 and a fifth lens group L5.
  • the solid line indicates the position of the fourth lens group L4 when the photographing distance is infinite
  • the alternate long and short dash line indicates the position of the fourth lens group L4 when the photographing distance is close.
  • the second lens group L2, the third lens group L3, and the fourth lens group L4 are held by the second lens holding frame 162, the third lens holding frame 163, and the fourth lens holding frame 164, respectively.
  • the lens barrel 100 is an inner focus type zoom lens having a fourth lens group L4 as a focus lens, and when the second lens group L2 moves in the optical axis OA direction, the focal distance changes and the fourth lens group is a focus lens.
  • the lens group L4 also moves so as not to change the shooting distance.
  • the shooting distance (focus position) changes. That is, the fourth lens group L4 moves in the optical axis OA direction both during zooming and focusing.
  • the lens barrel 100 includes a fixed barrel 110.
  • a lens mount 117 is fixed to the fixed cylinder 110 so that the lens barrel 100 can be attached to and detached from the camera 1.
  • the fixed cylinder 110 includes a first fixed cylinder 111, a second fixed cylinder 112, and a third fixed cylinder 113.
  • FIG. 3 is a schematic perspective view of the first fixed cylinder 111 and the fourth lens holding frame 164. As shown in FIG. 3, the first fixed cylinder 111 has a straight groove 114 and a circumferential groove 115.
  • the lens barrel 100 includes a zoom interlocking ring 151 that rotates in conjunction with the zoom operation ring 150 described later, and a focus interlocking ring 183 that is rotationally driven by the ultrasonic motor 190.
  • the zoom interlocking ring 151 and the focus interlocking ring 183 are rotatable about the optical axis OA.
  • the lens barrel 100 includes a zoom correction cam ring 170 arranged on the outer peripheral side of the first fixed cylinder 111, and a focus cam ring 180 arranged on the outer peripheral side of the zoom correction cam ring 170.
  • the zoom correction cam ring 170 and the focus cam ring 180 are rotatable with respect to the camera 1.
  • FIG. 4 to 6 are schematic perspective views of the zoom correction cam ring 170, the focus cam ring 180, and the second fixed cylinder 112, respectively. Further, FIG. 7 is a view of the focus cam ring 180 unfolded and viewed from the inner peripheral side.
  • the zoom correction cam ring 170 has a straight groove 171 along the optical axis OA direction. Further, the zoom correction cam ring 170 has a zoom correction cam groove 172 on the inner peripheral surface thereof, and a cam pin 173 projecting on the outer peripheral surface in a direction intersecting the optical axis OA direction. Further, the zoom correction cam ring 170 has a cam pin (not shown) for removing backlash that protrudes in a direction intersecting the optical axis OA direction on the outer peripheral surface thereof.
  • the focus cam ring 180 has a focus cam groove 181 on its inner peripheral surface and a pin 182 on its outer peripheral surface protruding in a direction intersecting the optical axis OA direction.
  • the second fixed cylinder 112 has a circumferential groove 112A.
  • FIG. 8 is a schematic perspective view of the lens barrel 100 as viewed from above, showing the engagement relationship of each component of the lens barrel 100.
  • the positions and dimensions of each component do not always match the actual ones.
  • a zoom operation ring 150 that rotates around the optical axis OA is provided on the outer peripheral side of the third fixed cylinder 113 along the outer peripheral surface of the third fixed cylinder 113.
  • a zoom interlocking ring 151 is provided on the inner peripheral side of the third fixed cylinder 113.
  • the zoom interlocking ring 151 is connected to the zoom operation ring 150 via a pin 152 penetrating the third fixed cylinder 113. Therefore, the zoom interlocking ring 151 rotates in conjunction with the rotation of the zoom operation ring 150.
  • a cam pin 166 projecting in a direction intersecting the optical axis OA direction is provided on the outer peripheral surface of the second lens holding frame 162.
  • the cam pin 166 penetrates the zoom cam groove 191 of the zoom interlocking ring 151 and is slidably fitted in the straight guide groove 192 of the third fixed cylinder 113.
  • the zoom interlocking ring 151 is rotated, the second lens holding frame 162 is moved straight along the zoom cam groove 191 and the straight guide groove 192 in the optical axis OA direction.
  • a pin 153 projecting in a direction intersecting the optical axis OA direction is provided.
  • the pin 153 penetrates the circumferential groove 115 of the first fixed cylinder 111 and engages with the straight groove 171 of the zoom correction cam ring 170 arranged on the outer peripheral side of the first fixed cylinder 111. It fits.
  • a cam pin 165 (see FIGS. 1, 2, and 8) projecting in a direction intersecting the optical axis OA direction is provided on the outer peripheral surface of the fourth lens holding frame 164. As shown in FIG. 8, the cam pin 165 penetrates the straight groove 114 of the first fixed cylinder 111 and engages with the zoom correction cam groove 172 of the zoom correction cam ring 170.
  • the zoom correction cam groove 172 is a cam groove for correcting the position of the fourth lens holding frame 164 in the optical axis OA direction, which changes with the zoom operation, in order to keep the in-focus state during the zoom operation constant.
  • the cam pin 173 of the zoom correction cam ring 170 engages with the focus cam groove 181 of the focus cam ring 180 arranged on the outer peripheral side of the zoom correction cam ring 170.
  • a cam pin (not shown) for removing backlash of the zoom correction cam ring 170 also engages with the focus cam groove 181.
  • the focus cam groove 181 is configured to change the extension amount of the fourth lens group L4 according to the focal length during the focusing operation. Specifically, as shown in FIG. 7, the position where the cam pin 173 engages with the focus cam groove 181 differs between the telephoto side state and the wide side state, and the focus cam groove 181 with respect to the circumferential direction The tilt is different between the tele side and the wide side. More specifically, the inclination of the focus cam groove 181 on the telephoto side is larger than the inclination of the focus cam groove 181 on the wide side. As a result, as shown in FIG.
  • the inclination of the focus cam groove 181 with respect to the circumferential direction may be larger on the wide side than on the tele side.
  • the pin 182 of the focus cam ring 180 engages with the circumferential groove 112A (see FIG. 6) of the second fixed cylinder 112. As a result, the movement of the focus cam ring 180 with respect to the first fixed cylinder 111 in the optical axis OA direction is restricted. That is, the focus cam ring 180 does not move in the direction of the optical axis OA, but only rotates around the optical axis OA.
  • a focus interlocking ring 183 that is rotationally driven by an ultrasonic motor 190 is fixed to the focus cam ring 180.
  • the focus cam ring 180 rotates in conjunction with the rotation of the focus interlocking ring 183.
  • FIG. 9A is a diagram showing a state of each component at the start of the zoom operation
  • FIG. 9B is a diagram for explaining the movement of each component at the time of the zoom operation.
  • the zoom correction cam ring 170 moves through the linear groove 171 that engages with the pin 153 due to the rotation of the zoom interlocking ring 151 around the optical axis OA. Rotate around.
  • the focus cam ring 180 is stationary during the zoom operation, and since the cam pin 173 of the zoom correction cam ring 170 is engaged with the focus cam groove 181 of the focus cam ring 180, it is rotated by the rotation of the zoom interlocking ring 151.
  • the zoom correction cam ring 170 moves in the optical axis OA direction while rotating along the focus cam groove 181 (see arrow AR3) (see arrow AR4).
  • the fourth lens holding frame 164 Since the cam pin 165 is engaged with the zoom correction cam groove 172 of the zoom correction cam ring 170, the fourth lens holding frame 164 is accompanied by the rotational movement of the zoom correction cam ring 170 in the optical axis OA direction (see arrow AR4). Then, it moves along the zoom correction cam groove 172. At this time, since the cam pin 165 of the fourth lens holding frame 164 is also engaged with the straight groove 114 of the first fixed cylinder 111, the rotation around the optical axis OA is restricted, and the fourth lens holding frame 164 It moves in the direction of the optical axis OA without rotating (see arrow AR5).
  • the fourth lens holding frame 164 moves in the optical axis OA direction by the total amount of the movement amount of the zoom correction cam ring 170 in the optical axis OA direction and the movement amount of the zoom correction cam groove 172 in the optical axis OA direction. To do.
  • the fourth lens holding frame 164 can be moved in the optical axis OA direction without rotating the fourth lens holding frame 164 during the zoom operation.
  • FIG. 10A is a diagram showing a state of each component at the start of the focus operation
  • FIG. 10B is a diagram for explaining the movement of each component at the time of the focus operation.
  • the focus cam ring 180 Since the focus cam ring 180 is fixed to the focus interlocking ring 183, the focus cam ring 180 rotates in conjunction with the rotation of the focus interlocking ring 183. At this time, since the zoom interlocking ring 151 is stationary, the rotation of the zoom correction cam ring 170 in which the pin 153 of the zoom interlocking ring 151 is engaged with the straight groove 171 is restricted around the optical axis OA (optical axis). It cannot rotate around the OA), and only the straight motion in the direction of the optical axis OA is possible. Since the cam pin 173 is engaged with the focus cam groove 181, when the focus cam ring 180 rotates, the zoom correction cam ring 170 moves along the focus cam groove 181 without rotating in the optical axis OA direction. (See arrow AR12).
  • the cam pin 165 is engaged with the zoom correction cam groove 172 of the zoom correction cam ring 170 and the straight groove 114 of the first fixed cylinder 111. Therefore, when the zoom correction cam ring 170 moves straight in the optical axis OA direction, the fourth lens holding frame 164 moves integrally with the zoom correction cam ring 170 (see arrow AR13). That is, the zoom correction cam ring 170 moves without rotating in the optical axis OA direction.
  • the fourth lens holding frame 164 can be moved in the optical axis OA direction even during the focusing operation.
  • the lens barrel 100 includes a focus cam ring 180 having a focus cam groove 181, a cam pin 173 that engages with the focus cam groove 181 and a zoom correction cam groove 172.
  • a fourth fixed cylinder 111 having a zoom correction cam ring 170 having a, and a straight groove 114 along the optical axis OA direction, and a cam pin 165 that engages with the zoom correction cam groove 172 and the straight groove 114.
  • a fourth lens holding frame 164 for holding the lens group L4 is provided. As a result, as described above, the fourth lens holding frame 164 can be moved in the optical axis OA direction without rotating during the zoom operation and the focus operation.
  • the inner focus type lens barrel employs a mechanism in which the lens holding frame of the focus lens and the focus lens move in the optical axis direction while rotating during focus operation because of ease of design and the reason that the number of parts is not increased. I often did. If the focus lens moves in the optical axis direction while rotating during the focusing operation, the optical performance may be lower than that of the eccentricity even if the optical performance is ensured by the alignment. Further, an inertial force acts on the lens holding frame, and a large driving force may be required to stop the lens holding frame. In addition, the stopping accuracy of the lens holding frame may deteriorate.
  • the fourth lens holding frame 164 can be moved in the optical axis OA direction without rotating during the zoom operation and the focus operation. Good optical performance can be maintained. Further, since the inertial force of rotation does not act on the fourth lens holding frame 164, deterioration of stopping accuracy can be suppressed. Further, since it is not necessary to provide a large hole in the fixed cylinder 110, the strength of the fixed cylinder 110 can be ensured.
  • the lens barrel 100 can be moved in the optical axis OA direction without rotating the fourth lens holding frame 164 during the zoom operation and the focus operation with the minimum number of parts.
  • the focus operation may be performed manually using the focus operation ring instead of using the ultrasonic motor 190. That is, the focus interlocking ring 183 may be rotated in conjunction with the focus operation ring instead of being rotationally driven by the ultrasonic motor 190.
  • the motor for driving the focus interlocking ring 183 is not limited to the ultrasonic motor 190, and may be any motor capable of rotationally driving the focus interlocking ring 183.
  • the zoom interlocking ring 151 is rotated to perform the zoom operation by rotating the zoom operation ring 150
  • the zoom interlocking ring 151 may be rotated by the motor.
  • the positional relationship between the first fixed cylinder 111, the fourth lens holding frame 164, the zoom correction cam ring 170, and the focus cam ring 180 is not limited to the above embodiment. If the engagement relationship between each cam pin and the cam groove, the straight groove, and the circumferential groove is maintained, the positional relationship of the fourth lens holding frame 164, the zoom correction cam ring 170, and the focus cam ring 180 can be changed. May be good.
  • cam pins 165 and 173 may be, for example, cam followers as long as they are protrusions that engage with the focus cam groove 181 and the zoom correction cam groove 172, respectively.
  • the focus cam ring 180 has the focus cam groove 181 and the zoom correction cam ring 170 has the cam pin 173 has been described, but the present invention is not limited to this, and the focus cam ring 180 has the cam pin 173 and the zoom correction cam
  • the ring 170 may have a focus cam groove 181.
  • the pin 153 of the zoom interlocking ring 151 and the zoom correction cam ring 170 The example in which the straight groove 171 is engaged with the straight groove 171 has been described, but the present invention is not limited to this.
  • the zoom operation ring 150 and the zoom correction cam ring 170 may be directly engaged with each other in a state where they can move relative to each other in the optical axis OA direction without going through the zoom interlocking ring 151.
  • the zoom operation ring 150 and the zoom correction cam ring 170 are directly engaged with each other in a state in which they can move relative to each other in the optical axis OA direction, one has a protrusion or a straight key, and a straight groove that engages with the protrusion is provided. It is conceivable that the other has.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
PCT/JP2020/049133 2020-01-06 2020-12-28 レンズ鏡筒及び光学機器 Ceased WO2021140989A1 (ja)

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JP2021570035A JP7435630B2 (ja) 2020-01-06 2020-12-28 レンズ鏡筒及び光学機器

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JP2020000238 2020-01-06
JP2020-000238 2020-01-06

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010039285A (ja) * 2008-08-06 2010-02-18 Canon Inc 撮像装置
JP2015152616A (ja) * 2014-02-10 2015-08-24 リコー光学株式会社 ズームレンズ鏡筒
JP2016008995A (ja) * 2014-06-23 2016-01-18 キヤノン株式会社 レンズ鏡筒および撮像装置
JP2019070758A (ja) * 2017-10-10 2019-05-09 キヤノン株式会社 レンズ鏡筒および撮像装置
JP2019133113A (ja) * 2018-02-03 2019-08-08 キヤノン株式会社 レンズ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010039285A (ja) * 2008-08-06 2010-02-18 Canon Inc 撮像装置
JP2015152616A (ja) * 2014-02-10 2015-08-24 リコー光学株式会社 ズームレンズ鏡筒
JP2016008995A (ja) * 2014-06-23 2016-01-18 キヤノン株式会社 レンズ鏡筒および撮像装置
JP2019070758A (ja) * 2017-10-10 2019-05-09 キヤノン株式会社 レンズ鏡筒および撮像装置
JP2019133113A (ja) * 2018-02-03 2019-08-08 キヤノン株式会社 レンズ装置

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JPWO2021140989A1 (https=) 2021-07-15

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