WO2010122841A1 - Cylindre à miroirs-lentilles, dispositif de saisie d'image et procédé de fabrication de cylindre à miroirs-lentilles - Google Patents

Cylindre à miroirs-lentilles, dispositif de saisie d'image et procédé de fabrication de cylindre à miroirs-lentilles Download PDF

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Publication number
WO2010122841A1
WO2010122841A1 PCT/JP2010/053223 JP2010053223W WO2010122841A1 WO 2010122841 A1 WO2010122841 A1 WO 2010122841A1 JP 2010053223 W JP2010053223 W JP 2010053223W WO 2010122841 A1 WO2010122841 A1 WO 2010122841A1
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WO
WIPO (PCT)
Prior art keywords
lens
lens frame
female screw
guide shaft
lens barrel
Prior art date
Application number
PCT/JP2010/053223
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English (en)
Japanese (ja)
Inventor
裕士 長谷川
Original Assignee
コニカミノルタオプト株式会社
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 コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Publication of WO2010122841A1 publication Critical patent/WO2010122841A1/fr

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Classifications

    • 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
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
    • 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
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing

Definitions

  • the present invention relates to a lens barrel in which a lens frame that holds a lens for zooming or focusing is driven by a lead screw and moves along a guide shaft that is arranged in parallel to the optical axis.
  • a lens barrel in which a lens frame that holds a predetermined lens for zooming or focusing is driven by a lead screw and moves along a guide shaft that is arranged in parallel to the optical axis.
  • a lens holding frame for holding a lens is guided by two guide shafts arranged in parallel with the optical axis, a lead screw is engaged with a rack gear portion of a rack supported by the lens holding frame, and the lead screw is rotated.
  • a lens driving device that moves the lens holding frame in the direction of the optical axis.
  • This lens driving device includes one coil spring having a function of pressing the rack in the optical axis direction to support the lens holding frame without backlash and a function of engaging the lead screw with the rack gear portion of the rack without backlash.
  • a portable terminal such as a cellular phone has an imaging device built therein, and a lens barrel incorporated in the imaging device is required to be small and thin.
  • a configuration suitable for mass production is also desired.
  • Patent Document 1 since Patent Document 1 is not intended for automatic assembly, each component must be mounted from various directions, and it is particularly difficult to automate the mounting of the coil spring.
  • the present invention has been made in view of such problems, and is a lens barrel having a lens frame and related members that are compact and can be automatically assembled, an image pickup apparatus including the lens barrel, and a lens barrel. It is an object of the invention to propose a manufacturing method.
  • a lens frame that holds the lens and has a main guide portion formed in a V shape or an arc shape; A first guide shaft disposed parallel to the optical axis of the lens and on which the main guide portion slides; A lead screw having a male screw and disposed parallel to the optical axis; A female screw member that is formed only in a part in the circumferential direction and has a female screw that engages with a male screw of the lead screw, and is rotatably supported by the lens frame in a direction orthogonal to the optical axis; , Located between the lens frame and the female screw member, the main guide portion of the lens frame is brought into contact with the first guide shaft, and the female screw of the female screw member is used as the male screw of the lead screw.
  • An urging member that urges to abut, Provided, A lens barrel, wherein the lens frame is moved along the first guide shaft through the female screw member by the rotation of the lead screw.
  • a second guide shaft is disposed parallel to the first guide shaft at a position opposite to the first guide shaft with respect to the optical axis, and an auxiliary guide portion formed flat on the lens frame is urged.
  • An imaging apparatus comprising the lens barrel according to any one of 1 to 5 above.
  • a lens frame having a main guide portion formed in a V shape or an arc shape is supported by a female screw member having a female screw formed only in a circumferential direction so as to be rotatable in a direction perpendicular to the optical axis.
  • the lens frame unit is formed by pivotally supporting the female screw member on the lens frame by a shaft portion formed in a direction parallel to the optical axis of the lens.
  • the lens barrel can be formed in a small size and can be automatically assembled. Therefore, mass production is possible and it can be manufactured at low cost. .
  • FIG. 2 is an exploded cross-sectional view of the lens barrel 1.
  • FIG. It is the perspective view which decomposed
  • FIG. 4 is a bottom view of a lens frame 31 and a female screw member 32.
  • FIG. 3 is a perspective view of a lens frame 31 and a female screw member 32.
  • FIG. 3 is a cross-sectional view of a lens frame 31 and a female screw member 32.
  • FIG. 4 is a bottom view of a lens frame 41 and a female screw member 42.
  • 4 is a perspective view of a lens frame 41 and a female screw member 42.
  • FIG. 3 is a cross-sectional view of a lens frame 41 and a female screw member 42.
  • FIG. 1 is a perspective view showing an arrangement of main members of a digital camera which is an example of an imaging apparatus having a lens barrel according to the present invention.
  • a lens barrel 1 incorporating a zoom lens as an imaging optical system is arranged vertically on the right side, and an optical image of a subject enters the opening 51.
  • a flash unit 52 denotes a flash light emission window
  • a flash unit 53 including a reflector, a xenon tube, a main capacitor, a circuit board, and the like is disposed behind the flash light emission window 52.
  • Reference numeral 54 denotes a memory card that records captured images.
  • a battery 55 supplies power to each unit. The image recording memory 54 and the battery 55 can be inserted and removed by opening and closing a lid member (not shown).
  • a release button 56 is arranged on the upper surface of the camera 50, and photometry and distance measurement are performed by pressing the first step, and exposure is performed by pressing the second step.
  • a main switch 57 is a switch for switching the camera between an operating state and a non-operating state. When switched to the operating state by the main switch 57, the lens barrier (not shown) is opened and the operation of each part is started. When the main switch 57 is switched to the non-operating state, the lens barrier is closed and the operation of each part is finished.
  • an image display unit 58 that is configured by an LCD, an organic EL, or the like and displays an image or other character information is disposed.
  • a zoom button for zooming up and down a playback button for playing back a captured image, a menu button for displaying various menus on the image display unit 58, and a desired function are selected from the display.
  • An operation member such as a selection button is arranged.
  • each part is connected between these main constituent units and a circuit board on which various electronic components are mounted is arranged to drive and control each main constituent unit. Yes.
  • an external input / output terminal, a strap attaching portion, a tripod seat, and the like are provided.
  • the imaging apparatus is not limited to a digital camera, and may be a video camera, a monitoring camera, a camera built in a portable terminal such as a cellular phone, or the like.
  • FIG. 2 is a sectional view of the zoom lens.
  • the zoom lens built in the lens barrel 1 is composed of four groups of a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4.
  • the first lens unit L1 includes a lens L11, a prism P, a lens L12, and a lens L13, and the lens L12 and the lens L13 are cemented lenses that are cemented with each other.
  • the light image of the subject that has passed through the opening 51 in FIG. 1 is transmitted through the lens L11, then is reflected at a right angle by the prism P as a reflective optical element, and is transmitted through the lens L12 and the lens L13. Therefore, the optical axis O1 of the lens L11 and the optical axis O2 after the lens L12 are orthogonal to each other.
  • the first lens unit L1 is fixed to the casing 11 and does not move.
  • the second lens unit L2 includes a lens L21 and a lens L22.
  • the second lens group L2 is held by the lens frame 31, and when zooming, the lens frame 31 is driven as will be described later, and the second lens group L2 advances and retreats along the optical axis O2.
  • the third lens unit L3 includes one lens L31.
  • the third lens unit L3 is held by the lens frame 41, and when zooming, the lens frame 41 is driven as described later, and the third lens unit L3 advances and retreats along the optical axis O2.
  • the third lens unit L3 moves, for example, in the direction of the fourth lens unit L4 along the optical axis O2 for focusing after the zooming is completed.
  • the fourth lens unit L4 includes one lens L41.
  • the fourth lens unit L4 is fixed to the housing 11 and does not move.
  • the optical image of the subject is arranged behind the fourth lens unit L4 by the zoom lens including the first lens unit L1, the second lens unit L2, the third lens unit L3, and the fourth lens unit L4.
  • An image is formed on an image sensor (not shown).
  • each member including the zoom lens is mounted on the housing 11, it is covered with a lid member 12 described later.
  • FIGS. 3 is a top view of the lens barrel when the zoom lens is set to the wide-angle end
  • FIG. 4 is a perspective view of the lens barrel when the zoom lens is set to the wide-angle end
  • FIG. 5 is a zoom lens set to the telephoto end
  • FIG. 6 is a perspective view of the lens barrel when the zoom lens is set at the telephoto end.
  • motors 21 and 22 which are stepping motors are arranged on the left and right of the lens L11.
  • the motor 21 is integrated with a lead screw 23 extending in the direction of the fourth lens group L4 and having a male screw
  • the motor 22 is extended with a lead screw 24 extending in the direction of the fourth lens group L4 and having a male screw. It is integrated. Since the lead screws 23 and 24 are located below the lens barrel 1, they are not shown in FIGS. 3 to 6, but will be described later in detail.
  • Two guide shafts 25 and 26 are fixed to the housing 11 in parallel with the lead screws 23 and 24, and the guide shafts 25 and 26 connect the lens frame 31 holding the second lens group L2 and the third lens group L3.
  • the lens frames 41 to be held are each guided in the direction of the optical axis O2.
  • the lens frames 31 and 41 are fitted with female screw members 32 and 42 each having a female screw formed only in a part in the circumferential direction.
  • the female screw of the female screw member 32 is connected to the male screw of the lead screw 23.
  • the female screw of the female screw member 42 is screwed with the male screw of the lead screw 24.
  • the female screw members 32 and 42 will be described later in detail.
  • the motor 21 rotates at the time of zooming
  • the lead screw 23 also rotates, and the lens frame 31 is guided by the guide shafts 25 and 26 via the female screw member 32 and moves in the direction of the optical axis O2.
  • the lead screw 24 also rotates, and the lens frame 41 is guided by the guide shafts 25 and 26 via the female screw member 42 and moves in the direction of the optical axis O2. Since the rotation amounts of the motors 21 and 22 differ according to the amount of zooming, the movement positions of the lens frame 31 and the lens frame 41 change, and the distance between the groups of the second lens group L2 and the third lens group L3 changes. Therefore, zooming of the zoom lens is performed.
  • the motor 22 rotates according to the imaging distance, and the lens frame 41 moves in the same manner to perform a focusing operation.
  • the lens frames 31 and 41 are moved to predetermined positions by controlling the rotation amounts and rotation directions of the motors 21 and 22. Can do.
  • FIG. 7 is an exploded cross-sectional view of the lens barrel 1
  • FIG. 8 is a perspective view of the lens barrel 1 disassembled and viewed from one lower side
  • FIG. 9 is an exploded perspective view of the lens barrel 1 viewed from the other lower side.
  • 10 is a bottom view of the lens frame 31 and the female screw member 32
  • FIG. 11 is a perspective view of the lens frame 31 and the female screw member 32
  • FIG. 12 is a sectional view of the lens frame 31 and the female screw member 32
  • FIG. 14 is a bottom view of the frame 41 and the female screw member 42
  • FIG. 14 is a perspective view of the lens frame 41 and the female screw member 42
  • FIG. 15 is a cross-sectional view of the lens frame 41 and the female screw member 42.
  • the main members constituting the lens barrel 1 include a lid member 12, a casing 11, a lens frame 31, a lens frame 41, and a motor holding member 13 from above, as shown in FIGS.
  • the lid member 12 covers each member mounted on the housing 11 and prevents intrusion of dust and the like.
  • the housing 11 is an essential member for holding each member, and guide shafts 25 and 26 for guiding the lens frames 31 and 41 in the direction of the optical axis O2 are inserted.
  • the lens frame 31 has a main guide portion 31b formed in a V shape by sliding the guide shaft 25 (first guide shaft) at the tip of an arm portion 31a extending rightward in FIG. 7, and an arm portion extending leftward.
  • a guide guide 26 (second guide shaft) is slid on the tip of 31c, and an auxiliary guide portion 31d formed flat is provided.
  • the lens frame 31 is assembled integrally with a female screw member 32, and the female screw member 32a is formed with only a part in the circumferential direction, and is a female screw 32a that is screwed with a male screw screwed on the outer periphery of the lead screw 23.
  • the main guide portion 31b is formed in a V shape only at both ends of the arm portion 31a in the optical axis O2 direction, and is formed in a U shape so as not to contact the guide shaft 25 in the middle.
  • the shape of the main guide portion 31b is not necessarily limited to the V shape, and may be formed in an arc shape formed of a U shape, a semicircle, or the like.
  • the lens frame 31 moves the main guide portion 31b. Prevents pivoting to the center.
  • the lens frame 41 has a main guide portion 41b formed in a V shape by sliding the guide shaft 26 on the tip of an arm portion 41a extending to the left in FIG. 7, and a guide shaft on the tip of an arm portion 41c extending to the right.
  • An auxiliary guide portion 41d that slides 25 and is formed in a flat shape is provided.
  • the lens frame 41 is assembled integrally with the female screw member 42, and the female screw member 42 is formed with only a part in the circumferential direction, and is a female screw portion that is screwed with a male screw screwed on the outer periphery of the lead screw 24. 42a.
  • the main guide portion 41b is formed in a V shape only at both ends of the arm portion 41a in the optical axis O2 direction, and is formed in a U shape so as not to contact the guide shaft 26 in the middle.
  • the shape of the main guide portion 41b is not necessarily limited to the V shape, and may be formed in an arc shape formed of a U shape, a semicircle, or the like.
  • the auxiliary guide portion 41d has the lens frame 41 that moves the main guide portion 41b. Prevents pivoting to the center.
  • the motor holding member 13 holds the motors 21 and 22, and the motors 21 and 22 are arranged in parallel with the guide shafts 25 and 26 and are integrated with lead screws 23 and 24 having male screws. And it mounts
  • the left side is the first lens unit L1 side and the right side is the fourth lens unit side.
  • the right side is the first lens unit L1 side and the left side is the fourth lens unit side. This is the lens group side.
  • the lens frame 31 is assembled integrally with the female screw member 32 as shown in FIGS.
  • the lens frame 31 has two bearing portions 31e and 31f protruding rightward in FIG. 12, and the bearing portions 31e and 31f are respectively provided with through holes 31g and 31h in parallel with the optical axis O2.
  • the female screw member 32 has shaft portions 32d and 32e protruding outward from the two leg portions 32b and 32c protruding downward.
  • the shaft portion 32d is inserted into the through hole 31g, and the shaft portion 32e is inserted into the through hole 31h.
  • the female screw member 32 is rotatable about the through holes 31g and 31h of the lens frame 31. Since the female screw member 32 is resin-molded, the shaft portions 32d and 32e can be inserted into the through holes 31g and 31h, respectively, by deforming the two leg portions 32b and 32c inward.
  • a non-through hole 31f is formed in the lower surface of the arm portion 31a of the lens frame 31, and a compression spring 33 (biasing member) is inserted into the non-through hole 31f.
  • the compression spring 33 protrudes from the lower surface of the arm portion 31 a and is crimped to the female screw member 32. Accordingly, the compression spring 33 biases the lens frame 31 and the female screw member 32 in a direction in which they are separated from each other.
  • the lens frame 31 is mounted from the lower side of the casing 11, and the motor holding member 13 is further mounted from the lower side. Then, since the female screw member 32 is urged by the compression spring 33 so as to rotate clockwise around the through holes 31g and 31h, the female screw 32a is a male screw 23a screwed on the outer periphery of the lead screw 23. Screwed together. On the other hand, since the lens frame 31 is biased upward by the compression spring 33, the main guide portion 31 b of the lens frame 31 is in pressure contact with the guide shaft 25, and the auxiliary guide portion 31 d is in pressure contact with the guide shaft 26.
  • the lens frame 41 is the same as the lens frame 31.
  • the lens frame 41 is integrally assembled with the female screw member 42 as shown in FIGS.
  • the lens frame 41 has two bearing portions 41e and 41f protruding leftward in FIG. 15.
  • the bearing portions 41e and 41f are respectively provided with through holes 41g and 41h in parallel with the optical axis O2.
  • the female screw member 42 has shaft portions 42d and 42e protruding outward from the two leg portions 42b and 42c protruding downward.
  • the shaft portion 42d is inserted into the through hole 41g, and the shaft portion 42e is inserted into the through hole 41h.
  • the female screw member 42 is rotatable about the through holes 41g and 41h of the lens frame 41. Since the female screw member 42 is resin-molded, the shaft portions 42d and 42e can be inserted into the through holes 41g and 41h, respectively, by deforming the two leg portions 42b and 42c inward.
  • a non-through hole 41f is formed in the lower surface of the arm portion 41a of the lens frame 41, and a compression spring 43 (biasing member) is inserted into the non-through hole 41f.
  • the compression spring 43 protrudes from the lower surface of the arm portion 41 a and is crimped to the female screw member 42. Accordingly, the compression spring 43 biases the lens frame 41 and the female screw member 42 in a direction in which they are separated from each other.
  • the lens frame 41 is mounted from below the housing 11, and the motor holding member 13 is mounted from below. Then, the female screw member 42 is urged by the compression spring 43 so as to rotate clockwise around the through holes 41g and 41h, so that the female screw portion 42a is a male screw screwed on the outer periphery of the lead screw 24. 24a is screwed.
  • the lens frame 41 is urged upward by the compression spring 43, the main guide portion 41 b of the lens frame 41 comes into pressure contact with the guide shaft 26 and the auxiliary guide portion 41 d comes into pressure contact with the guide shaft 25.
  • the housing unit 10 is a unit in a state where at least the guide shafts 25 and 26 are inserted into the housing 11.
  • the lens frame unit 30 is a unit in a state where a female screw member 32 and a compression spring 33 are mounted on the lens frame 31.
  • the lens frame unit 40 is a unit in a state where the female screw member 42 and the compression spring 43 are mounted on the lens frame 41.
  • the motor unit 20 is a unit in a state where the motors 21 and 22 integrated with the lead screws 23 and 24 are mounted on the motor holding member 13.
  • first lens group L1, the fourth lens group L4, and the like may be attached to the housing unit 10 in advance, or may be attached after assembly, which will be described later.
  • the units are arranged upside down from those shown in FIGS. 7 to 9, but first, the housing unit 10 is arranged on the work table. Next, the main guide portion 31b is engaged with the guide shaft 25, the auxiliary guide portion 31d is brought into contact with the guide shaft 26, and the lens frame unit 30 is placed on the upper portion of the housing unit 10 (lower portion in FIGS. 7 to 9). Placed on. Subsequently, the main guide portion 41b is engaged with the guide shaft 26, the auxiliary guide portion 41d is brought into contact with the guide shaft 25, and the lens frame unit 40 is placed above the housing unit 10 (lower portion in FIGS. 7 to 9). Placed on.
  • the male screw 23a of the lead screw 23 is screwed with the female screw 32a of the female screw member 32, and the male screw 24a of the lead screw 24 is screwed with the female screw portion 42a of the female screw member 42, so that the motor unit 20 is engaged. Is mounted on the housing unit 10. After the assembly, the assembled unit is inverted and the lid member 12 is attached. Thus, the lens barrel 1 is completed.
  • the lens frame 31 is guided by the guide shafts 25 and 26 via the female screw member 32 by the rotation of the lead screw 23 and can move.
  • the screw 24 is rotated by being guided by the guide shafts 25 and 26 through the female screw member 42.
  • the lens frame unit 30, the lens frame unit 40, and the motor unit 20 can be assembled to the housing unit 10 in order from one direction, automatic assembly using a robot arm is possible. Become.
  • the zoom lens having the reflective optical element has been described.
  • the present invention does not necessarily have the reflective optical element, and is not a zoom lens but a single focus lens. Also good.
  • the number of lens frames to be moved is not limited to two, and may be one or three or more.

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

Abstract

L'invention concerne un cylindre à miroirs-lentilles de petite taille et qui permet un assemblage automatique. Le cylindre à miroirs-lentilles comporte: un cadre de lentilles comportant une partie de guide principal retenant la lentille et qui présente une forme de V ou une forme arquée; un premier axe de guidage placé parallèlement à l'axe optique de la lentille, et le long duquel glisse la partie de guide principal; une vis-mère qui comporte un filetage mâle et est placée parallèlement à l'axe optique; un élément à filetage femelle qui comporte un filetage femelle et se visse sur le filetage mâle de la vis-mère, cet élément n'étant formé que d'une partie de celle-ci dans la direction circonférentielle et étant maintenu rotatif dans le cadre de lentilles, perpendiculairement par rapport à l'axe optique; et un élément de sollicitation, positionné entre le cadre de lentilles et l'élément à filetage femelle, qui fait en sorte que la partie de guide principal du cadre de lentilles touche le premier axe de guidage et sollicite le filetage femelle de l'élément à filetage femelle contre le filetage mâle de la vis-mère. Le cadre de lentilles se déplace le long du premier axe de guidage par la rotation de la vis-mère, par l'intermédiaire de l'élément à filetage femelle.
PCT/JP2010/053223 2009-04-22 2010-03-01 Cylindre à miroirs-lentilles, dispositif de saisie d'image et procédé de fabrication de cylindre à miroirs-lentilles WO2010122841A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009103647 2009-04-22
JP2009-103647 2009-04-22

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WO2010122841A1 true WO2010122841A1 (fr) 2010-10-28

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