WO2013027309A1 - Barillet d'objectif - Google Patents

Barillet d'objectif Download PDF

Info

Publication number
WO2013027309A1
WO2013027309A1 PCT/JP2012/002878 JP2012002878W WO2013027309A1 WO 2013027309 A1 WO2013027309 A1 WO 2013027309A1 JP 2012002878 W JP2012002878 W JP 2012002878W WO 2013027309 A1 WO2013027309 A1 WO 2013027309A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
lens barrel
zoom
torque
lens
Prior art date
Application number
PCT/JP2012/002878
Other languages
English (en)
Japanese (ja)
Inventor
武生 三東
雅之 秋枝
力弥 江島
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 WO2013027309A1 publication Critical patent/WO2013027309A1/fr

Links

Images

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
    • G02B7/102—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 controlled by a microcomputer
    • 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
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably

Definitions

  • the technology disclosed here relates to a lens barrel.
  • a lens barrel including a focus operation tube for adjusting a focus position and a zoom operation tube for adjusting a zoom position is known (for example, Patent Documents). 1).
  • This lens barrel includes a focus operation tube and a zoom operation tube disposed on the outer side in the radial direction.
  • the zoom operation tube and the focus operation tube are respectively rotated around the optical axis by the photographer during the zoom operation and the focus operation.
  • the zoom operation cylinder is rotated, the zoom lens frame moves back and forth in the optical axis direction via the zoom cam mechanism, thereby performing a zoom operation.
  • the focus lens frame is moved back and forth in the optical axis direction via the focus cam mechanism in which the focus operation cylinder is rotated, thereby performing a focus operation.
  • the focus operation tube (first ring) and the zoom operation tube (second ring) are connected to the focus cam mechanism and the zoom cam mechanism, respectively. For this reason, the photographer needs to operate each operation cylinder by putting a force sufficient to overcome the driving reaction force of the cam mechanism into the fingertip. As a result, there is a problem that the entire lens barrel (the entire camera) is tilted due to the reaction of the force applied to the fingertip, and blurring occurs during movie shooting.
  • the technology disclosed herein has been made in view of such a point, and an object thereof is to provide a lens barrel that requires less force to be put into the fingertip when operating the first and second rings. It is in.
  • the technique disclosed herein is intended for a lens barrel including at least one lens.
  • the first electric mechanism is driven when the first ring is operated, and the second electric mechanism is driven when the second ring mechanism is operated.
  • the first and second rings are not interlocked with the cam mechanism, but are interlocked with the electric mechanism, so that the photographer can put in the fingertip when operating the first and second rings. Can be reduced. Therefore, it is possible to prevent the whole lens barrel (the entire camera) from being tilted by the reaction of the force applied to the fingertip during photographing, and to prevent blurring during photographing.
  • FIG. 1 shows a perspective view of the imaging apparatus 1.
  • the imaging device 1 is a digital camera with interchangeable lenses.
  • the imaging device 1 includes a camera body 2 and a lens barrel 3 that is detachably attached to the camera body 2.
  • the subject side in the optical axis direction of the lens barrel 3 will be described as the front, and the camera body side in the optical axis direction will be described as the rear.
  • the circumferential direction means the circumferential direction around the optical axis
  • the radial direction means the radial direction around the optical axis.
  • FIG. 2 shows a perspective view of the camera body 2 when the lens barrel 3 is removed.
  • the camera body 2 includes a body mount 2a that is a part to which the lens barrel 3 is attached, and an imaging element 2b that captures an optical image formed by the lens barrel 3 and converts it into image data.
  • FIG. 3 shows a perspective view of the lens barrel 3 as viewed from diagonally forward
  • FIG. 4 shows a perspective view of the lens barrel 3 as viewed from diagonally rear.
  • a bayonet type lens mount 110 is provided at the rear end of the lens barrel 3.
  • the lens barrel 3 is mechanically and electrically connected to the camera body 2 via the lens mount 110 and the body mount 2a.
  • the lens barrel 3 is a fixed zoom lens with a full length.
  • FIG. 6 is a sectional view of the lens barrel 3 at the wide-angle end
  • FIG. 7 is a sectional view of the lens barrel 3 at the telephoto end.
  • the lens barrel 3 is provided with an optical system L composed of a plurality of lenses, a first group to seventh group lens frame 10 to 70 that holds the lens, and a lens group 3 before supporting and housing the first group to seventh group lens frame 10 to 70.
  • a fixed frame 80 and a rear fixed frame 90, a printed circuit board 100, a lens mount 110, a filtering 120, a focus ring 130, an intermediate ring 140, a zoom ring 150, and an outer frame 160 are provided.
  • the optical system L is a zoom lens system for forming an optical image of a subject, and is composed of first to seventh group lenses G1 to G7.
  • the first group lens G1 includes first to third lenses L1 to L3.
  • the second group lens G2 includes fourth to sixth lenses L4 to L6.
  • the second group lens G2 is a zoom lens.
  • the third group lens G3 includes seventh to ninth lenses L7 to L9.
  • the fourth group lens G4 includes tenth and eleventh lenses L10 and L11.
  • the fourth group lens G4 is a lens for image blur correction.
  • the fifth group lens G5 includes a twelfth lens L12.
  • the sixth group lens G6 includes a thirteenth lens L13.
  • the fifth group and sixth group lenses G5 and G6 are focus lenses.
  • the seventh group lens G7 includes a fourteenth lens L14.
  • the front fixed frame 80 is a cylindrical member.
  • An annular front wall 81 having an opening at the center is provided at the front end of the front fixed frame 80.
  • a flange 82 protruding outward in the radial direction is provided at the rear end of the front fixed frame 80.
  • the front fixed frame 80 is provided with a zoom motor (not shown) that drives a second group lens frame 20 described later.
  • the rear fixed frame 90 is a cylindrical member.
  • An annular rear wall 91 having an opening at the center is provided at the rear end of the rear fixed frame 90.
  • a cylindrical portion 92 extending further rearward is provided at the opening edge of the rear wall 91.
  • the rear fixed frame 90 is provided with a first focus motor (not shown) that drives a later-described fifth group lens frame 50 and a second focus motor (not shown) that drives a later-described sixth group lens frame 60. .
  • the front fixed frame 80 and the rear fixed frame 90 are connected to form an integral cylinder.
  • two first shafts 83 extending in the optical axis direction and two second shafts 84 extending in the optical axis direction are provided in the front fixed frame 80 and the rear fixed frame 90.
  • the first shaft 83 is supported by the front wall 81 of the front fixed frame 80 and the rear wall 91 of the rear fixed frame 90.
  • the second shaft 84 is supported by the flange 82 of the front fixed frame 80 and the rear wall 91 of the rear fixed frame 90.
  • the front fixed frame 80 and the rear fixed frame 90 support the first group lens frame 10 at the front end, support the seventh group lens frame 70 at the rear end, and the second group to sixth group lens frames 20 to 60 at the inner side. Contained.
  • FIG. 5 illustrates a state in which the second group lens frame 20 is exposed forward of the front fixed frame 80 for convenience of explanation.
  • the first group lens frame 10 is an annular member having an opening in the center, and holds the first group lens G1 in the opening.
  • the first group lens frame 10 is attached to the front surface of the front wall 81 of the front fixed frame 80 via the adjustment base 15.
  • the adjustment base 15 is a member for adjusting the inclination of the first group lens G1 with respect to the optical axis AX.
  • the second group lens frame 20 is an annular member having an opening at the center, and holds the second group lens G2 in the opening.
  • the second group lens frame 20 is supported on the first shaft 83 via the bearing 22 so as to be movable in the optical axis direction.
  • the second group lens frame 20 is driven by an electric zoom mechanism 159 including the zoom motor provided in the front fixed frame 80, and moves in the optical axis direction.
  • the electric zoom mechanism 159 includes, for example, a lead screw of a zoom motor and a rack that meshes with the lead screw.
  • the third group lens frame 30 is an annular member having an opening in the center, and is a front frame 31 that holds the seventh lens L7 in the opening, and an annular member having an opening in the center. And a rear frame 32 that holds the eighth and ninth lenses L8 and L9. A diaphragm mechanism 33 is provided between the front frame 31 and the rear frame 32. The third group lens frame 30 is fixed to the front portion of the rear fixed frame 90.
  • the fourth group lens frame 40 is an annular member having an opening at the center, and holds the fourth group lens G4 in the opening.
  • the fourth group lens frame 40 is supported by the rear frame 32 of the third group lens frame 30 so as to be movable within a plane orthogonal to the optical axis AX.
  • the fourth group lens frame 40 is provided with two magnets (not shown).
  • the rear frame 32 is provided with two coils (not shown).
  • the fourth group lens frame 40 is driven by the magnetic force generated by the coil of the rear frame 32 and moves in a plane perpendicular to the optical axis AX.
  • the fifth group lens frame 50 is an annular member having an opening in the center, and holds the fifth group lens G5 in the opening.
  • the fifth group lens frame 50 is supported by the second shaft 84 via the bearing portion 51 so as to be movable in the optical axis direction.
  • the fifth group lens frame 50 is driven by an electric focus mechanism 139 including the first focus motor provided on the rear fixed frame 90, and moves in the optical axis direction.
  • This electric focus mechanism is composed of, for example, a lead screw of a focus motor and a rack that meshes with the lead screw.
  • the sixth group lens frame 60 is an annular member having an opening at the center, and holds the sixth group lens G6 in the opening.
  • the sixth group lens frame 60 is supported by the first shaft 83 via the bearing 61 so as to be movable in the optical axis direction.
  • the sixth group lens frame 60 is driven by the second focus motor provided on the rear fixed frame 90 and moves in the optical axis direction.
  • the seventh group lens frame 70 is an annular member having an opening in the center, and holds the seventh group lens G7 in the opening.
  • the seventh group lens frame 70 is attached to the rear end surface of the cylindrical portion 92 of the rear fixed frame 90.
  • the first group lens frame 10, the third group lens frame 30, and the seventh group lens frame 70 are fixedly supported by the front fixed frame 80 or the rear fixed frame 90.
  • the second group lens frame 20, the fifth group lens frame 50, and the sixth group lens frame 60 are supported by the front fixed frame 80 or the rear fixed frame 90 so as to be movable in the optical axis direction.
  • the fourth group lens frame 40 is supported by the third group lens frame 30 so as to be movable within a plane orthogonal to the optical axis AX.
  • the lens mount 110 is an annular member having an opening at the center, and is configured to be attachable to the body mount 2a.
  • the lens mount 110 is attached to the rear wall 91 of the rear fixed frame 90.
  • the printed circuit board 100 is provided with at least a lens microcomputer (not shown) and a memory (not shown). Electrical components of the lens barrel 3 are electrically connected to the printed circuit board 100 via a flexible printed circuit board.
  • the printed circuit board 100 is also electrically connected to a mount contact (not shown) provided on the lens mount 110. That is, the printed circuit board 100 is electrically connected to the camera body 2 when the lens barrel 3 is attached to the camera body 2.
  • the printed circuit board 100 is disposed between the rear wall 91 of the rear fixed frame 90 and the lens mount 110.
  • the filtering 120, the focus ring 130, the intermediate ring 140, the zoom ring 150, and the outer frame 160 are arranged in this order from the front side in the optical axis direction. As shown in FIGS. 1 to 3, these are exterior members exposed to the outside.
  • the filtering 120 is a member for attaching an optical filter, a conversion lens, a lens hood, and the like.
  • the filtering 120 is attached to the front surface of the front wall 81 of the front fixed frame 80.
  • the intermediate ring 140 is inserted into the outer periphery of the front fixed frame 80 and attached to the front fixed frame 80 so as not to rotate.
  • a photo sensor 202 that detects the amount of rotation of the focus ring 130 and the zoom ring 150 is provided on the inner peripheral surface of the intermediate ring 140.
  • the outer frame 160 is fitted on the outer periphery of the rear fixed frame 90 and is attached to the rear fixed frame 90 so as not to rotate.
  • a zoom lever switch 161 is provided on the outer peripheral surface of the outer frame 160 so as to be exposed to the outside.
  • the focus ring 130 is inserted into the outer periphery of the front fixed frame 80 and supported by the filtering 120 and the intermediate ring 140 in a state of being rotatable around the optical axis AX.
  • the zoom ring 150 is inserted over the outer periphery of the front fixed frame 80 and the outer periphery of the rear fixed frame 90, and is supported by the intermediate ring 140 and the rear fixed frame 90 so as to be rotatable around the optical axis AX. .
  • Knurls are formed on the outer peripheral surface of the focus ring 130 to prevent slippage during manual operation.
  • a cylindrical member 170 having a knurl on the outer periphery is externally mounted for preventing slippage during manual operation.
  • the zoom magnification can be manually adjusted by operating either the zoom ring 150 or the zoom lever switch 161. Further, the focus state can be manually adjusted by operating the focus ring 130.
  • the zoom ring 150 when the zoom ring 150 is rotated, the amount of rotation is detected by a rotation detector 201 described later, and the detection signal is transmitted to the printed circuit board 100 via the flexible printed circuit board 250.
  • a detection signal corresponding to the operation amount is transmitted to the printed circuit board 100.
  • the lens microcomputer In the printed circuit board 100, the lens microcomputer outputs a drive signal corresponding to the detection signal to the zoom motor.
  • the zoom motor operates in accordance with the drive signal and moves the second group lens frame 20 in the optical axis direction. Thus, the zoom magnification is adjusted manually.
  • the fifth and sixth group lens frames 50 and 60 are driven in conjunction with the second group lens frame 20.
  • the lens microcomputer moves the fifth and sixth group lens frames 50 and 60 to positions where the in-focus state can be maintained before and after the focal length changes based on a tracking table stored in advance. That is, when the detection signal is input, the lens microcomputer not only outputs a drive signal to the zoom motor but also outputs a drive signal to the first and second focus motors. As a result, the fifth group and sixth group lens frames 50 and 60 are moved to positions corresponding to the position of the second group lens frame 20.
  • the lens microcomputer outputs a drive signal corresponding to the detection signal to the first and second focus motors.
  • the first and second focus motors operate according to the drive signal and move the fifth group and sixth group lens frames 50 and 60 in the optical axis direction.
  • the in-focus state is manually adjusted.
  • intermediate ring> 8 is a perspective view of a portion of the lens barrel 3 in front of the rear fixing frame 90 as viewed obliquely from the front
  • FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 3, and FIG. The perspective view which looked at from diagonally forward is shown.
  • the intermediate ring 140 is formed on the front side of the main body ring portion 141 that is exposed to the outside and forms the outer peripheral surface of the lens barrel 3, and on the front side of the main body ring portion 141. It has a front ring portion 142 that supports it, and a rear ring portion 143 that is formed on the rear side of the main body ring portion 141 and supports the zoom ring 150.
  • the outer diameters of the front ring portion 142 and the rear ring portion 143 are smaller than the outer diameter of the main body ring portion 141.
  • the surface connecting the outer peripheral surface of the front ring portion 142 and the outer peripheral surface of the main body ring portion 141 and the surface connecting the outer peripheral surface of the rear ring portion 143 and the outer peripheral surface of the main body ring portion 141 are each perpendicular to the optical axis direction. These are annular step surfaces 144 and 145. A slight gap is formed between the step surface 144 and the rear end surface of the focus ring 130 and between the step surface 145 and the front end surface of the zoom ring 150.
  • a fixing seat 146 for fixing the flexible printed circuit board 250 is formed on the inner peripheral surface of the intermediate ring 140.
  • the fixing seat portion 146 includes a pair of front and rear rectangular plate portions 146a and 146b that are provided on the inner peripheral surface of the intermediate ring 140 and extend outward in the optical axis direction.
  • the surfaces of the rectangular plate portions 146a and 146b on the outer periphery side of the ring are connected and supported to the end surface in the optical axis direction of the intermediate ring 140 via a plurality of triangular plate-like ribs 148 arranged in the circumferential direction.
  • Each of the rectangular plate portions 146a and 146b protrudes outward from both end surfaces of the intermediate ring 140 in the optical axis direction.
  • a pair of sensor mounting holes 146f through which the photosensor 202 passes are formed in portions protruding from both end surfaces in the optical axis direction of the intermediate ring 140.
  • a pair of protrusions 147 protruding inward in the radial direction is formed on portions that do not protrude from both end faces in the optical axis direction of the intermediate ring 140 (see FIG. 10).
  • the flexible printed circuit board 250 is fixed to the fixing seat 146 by engaging an engagement hole 253f formed at the tip of the flexible printed circuit board 250 with the protrusion 147.
  • the inner peripheral surface of the focus ring 130 is slidably fitted to the front end portion of the outer peripheral surface of the front ring portion 142.
  • the inner peripheral surface of the zoom ring 150 is slidably fitted to the rear end portion of the outer peripheral surface of the rear ring portion 143.
  • Zoom ring support structure As described above, the zoom ring 150 is supported by the intermediate ring 140 and the rear fixing frame 90 (see FIG. 9).
  • a pair of front and rear protrusion support portions 93 and 94 that protrude radially outward to support the zoom ring 150 are formed on the outer peripheral surface of the rear fixed frame 90.
  • Each protrusion support part 93 and 94 is formed so that it may extend in the circumferential direction.
  • the outer diameter of the first protrusion support part 93 located on the front side is smaller than the outer diameter of the second protrusion support part 94 located on the rear side.
  • the inner peripheral surface of the zoom ring 150 is slidable on the first fitting surface 151 slidably fitted on the outer peripheral surface 93 a of the first protruding support portion 93 and the outer peripheral surface 94 a of the second protruding support portion 94.
  • a second fitting surface 152 that is fitted on the outside.
  • the first fitting surface 151 is formed at an intermediate portion of the zoom ring 150 in the optical axis direction.
  • the second fitting surface 152 is formed at the rear end of the zoom ring 150.
  • a surface connecting the first fitting surface 151 and the second fitting surface 152 is an annular step surface 153 perpendicular to the optical axis direction.
  • the step surface 153 is slidably in contact with the front side surface of the second protruding support portion 94 formed on the rear fixed frame 90.
  • rotation detection comb teeth 154 are formed over the entire circumference.
  • the inner peripheral surface of the zoom ring 150 further includes a third fitting surface 155 that is slidably fitted to the outer peripheral surface of the rear ring portion 143 of the intermediate ring 140.
  • the third fitting surface 155 is formed at the front end of the zoom ring 150.
  • a surface connecting the first fitting surface 151 and the third fitting surface 155 is an annular step surface 156 perpendicular to the optical axis direction.
  • a rear end surface of the rear ring portion 143 of the intermediate ring 140 is slidably in contact with the step surface 156.
  • a slight gap is formed between the rear end portion of the zoom ring 150 and the outer frame 160.
  • the step surface 153 and the step surface 156 constitute a first sliding surface 300 that is a sliding surface with the fixing member of the zoom ring 150.
  • the front side surface 94 b of the portion 94 and the rear end surface 143 b of the rear ring portion 143 constitute a first receiving surface 400 that slidably contacts the first sliding surface 300.
  • Focus ring support structure As described above, the focus ring 130 is supported by the intermediate ring 140 and the filtering 120 (see FIG. 9).
  • the inner peripheral surface of the focus ring 130 slides on the first fitting surface 131 slidably fitted on the outer peripheral surface of the front ring portion 142 of the intermediate ring 140 and the outer peripheral surface 120 a of the rear end portion of the filtering 120. And a second fitting surface 132 that is fitted to the outside.
  • the first fitting surface 131 is formed at the rear end portion of the focus ring 130
  • the second fitting surface 132 is formed at the front end portion of the focus ring 130.
  • An intermediate portion in the front-rear direction on the inner peripheral surface of the focus ring 130 is a non-fitting surface 133. At the center of the non-fitting surface 133 in the optical axis direction, a comb tooth 134 for detecting rotation of the focus ring 130 is formed over the entire circumference.
  • a surface connecting the first fitting surface 131 and the non-fitting surface 133 is an annular step surface 135 perpendicular to the optical axis direction.
  • the step surface 135 includes a front end surface 142b of the front ring portion 142 of the intermediate ring 140. Are in slidable contact.
  • the surface connecting the second fitting surface 132 and the non-fitting surface 133 is an annular step surface 136 perpendicular to the optical axis direction, and the rear end surface 120b of the filtering 120 slides on the step surface 136. Abutting as possible.
  • the first fitting surface 131, the second fitting surface 132, the step surface 135, and the step surface 136 of the focus ring 130 form a second sliding surface 500 that is a sliding surface with the fixing member of the focus ring 130. It is composed.
  • outer peripheral surface 142a of the front ring portion 142 of the intermediate ring 140, the outer peripheral surface 120a of the rear end portion of the filtering 120, the front end surface 142b of the front ring portion 142, and the rear end surface 120b of the filtering 120 are the second ones.
  • a second receiving surface 600 that slidably contacts the sliding surface 500 is configured.
  • Grease is applied to the first sliding surface 300.
  • this grease is applied in advance to the outer peripheral surfaces of the first and second protruding support portions 94 of the rear fixed frame 90 and the outer peripheral surface of the rear ring portion 143 of the intermediate ring 140. Just keep it.
  • the grease is filled and applied not only to the first sliding surface 300 formed on the zoom ring 150 but also to the gap space V ⁇ b> 1 formed between the zoom ring 150 and the rear ring portion 143.
  • grease is also applied to the second sliding surface 500 formed on the focus ring 130.
  • this grease may be applied in advance to the outer peripheral surface of the rear end portion of the filtering 120 and the outer peripheral surface of the front ring portion 142 of the intermediate ring 140.
  • the grease is filled and applied not only to the second sliding surface 500 formed on the focus ring 130 but also to the gap space V2 formed between the focus ring 130 and the front ring portion 142. Further, the grease is filled and applied also to the gap space V3 formed between the focus ring 130 and the filtering 120.
  • the volumes of the gap spaces V1, V2, and V3 are S1, S2, and S3, respectively, the relationship of S1> S2 + S3 is satisfied.
  • the grease applied in this manner has a function of suppressing wear between the rings 130 and 150 and the mating sliding member when the rings 130 and 150 are operated, and the operation direction with respect to the rings 130 and 150. And has a function of applying torque in the opposite direction.
  • zoom ring and focus ring torque settings Details of zoom ring and focus ring torque settings>
  • the torque acting on the zoom ring 150 and the torque ratio acting on the focus ring 130 are set based on a questionnaire survey for 50 subjects.
  • Fig. 12 (a) is a table showing the results of the investigation.
  • the survey uses five lens barrels with torque ratios set to 1.04, 1.07, 1.16, 1.27, and 1.47, respectively.
  • Got. “ ⁇ ” in the table means “obviously understand the torque difference”, “ ⁇ ” means “almost the same but understand the difference”, and “ ⁇ ” means “not feel the torque difference”. I mean.
  • Fig. 12 (b) is a table in which the above survey results are converted into an index "degree of recognition of torque difference”.
  • This “degree of recognition of torque difference” is obtained by scoring “ ⁇ ”, “ ⁇ ”, and “ ⁇ ” as 1 point, 0.5 point, and 0 point, respectively, and then the total score of the entire subject for each torque Is an average value.
  • FIG. 13 is a graph of this, and the horizontal axis of the graph indicates the torque difference (torque ratio), and the vertical axis indicates the “degree of recognition of the torque difference”.
  • the torque ratio is set to 1.3 or more with a margin with respect to 1.27.
  • FIG. 11 shows a flexible printed circuit board 250 and a rotation detector arranged on the circuit board 250.
  • the rotation detector 200 for the focus ring and the rotation detector 201 for the zoom ring are disposed on one flexible printed circuit board 250.
  • the rotation detection comb teeth 134 and 154 are formed on the inner peripheral surfaces of the focus ring 130 and the zoom ring 150 over the entire circumference, and the rotation detectors 200 and 201 each have the comb teeth 134. , 154 are detected and the detection signal is output to the lens microcomputer.
  • the rotation detector 201 for zoom rings will be mainly described.
  • the rotation detector 201 has a pair of photosensors 202 arranged in the circumferential direction around the optical axis.
  • Each photosensor 202 has a light emitting unit 203 and a light receiving unit 204.
  • the light emitting unit 203 and the light receiving unit 204 are arranged to face each other in the optical axis direction across a path through which the comb teeth 154 pass.
  • the photosensor 202 detects that the comb teeth pass, and outputs the detection signal to the lens microcomputer as a first detection signal.
  • the lens microcomputer determines the amount and direction of rotation of the zoom ring 150 based on the detection signal from the photosensor. In the case of the rotation detector 200 for the focus ring, the photo sensor detects the passage of the comb teeth and outputs the detection signal as a second detection signal to the lens microcomputer.
  • the flexible printed circuit board 250 is a flexible printed circuit board made of polyimide or the like, and a conductive wire is formed inside.
  • the flexible printed circuit board 250 is connected to a strip-shaped wiring portion 251, a connection terminal portion 252 connected to the base end portion of the wiring portion 251, and a distal end portion of the wiring portion 251, and a rectangular where the photosensor 202 is disposed. And a sensor arrangement portion 253 having a shape.
  • the sensor arrangement portion 253 is attached to the fixing seat portion 146 of the intermediate ring 140 in a state where the longitudinal direction thereof coincides with the optical axis direction. That is, the sensor arrangement portion 253 is attached to the fixing seat portion 146 in a state where the width direction thereof coincides with the circumferential direction of the intermediate ring 140.
  • a slit 255 that opens to the front end side in the longitudinal direction is formed at the center in the width direction of the sensor arrangement portion 253.
  • the sensor placement portion 253 is bent and attached to the fixing seat portion 146 so that the central portion in the longitudinal direction is raised in a mountain shape in cross section. This raised portion is received between a pair of front and rear ribs 149 formed on the inner peripheral surface of the intermediate ring 140 (see FIG. 9).
  • the sensor placement portion 253 is formed with an engagement hole 253f that engages with the protrusion 147 formed on the fixing seat 146.
  • a total of four engagement holes 253f are formed, two on each side of the slit 255 of the sensor placement portion 253.
  • connection terminal portion 252 is bent at a right angle from the wiring portion 251 and electrically connected to the printed circuit board 100.
  • a fixing piece 254 that protrudes outward in the width direction is formed at the center in the longitudinal direction of the wiring portion 251.
  • the fixing piece 254 is formed with an engagement hole 254f that engages with a protrusion (not shown) formed in the rear fixing frame 90.
  • the lens barrel 3 of the present embodiment includes a front fixed frame 80, a rear fixed frame 90, a filtering 120 and an intermediate ring 140 fixed to the front fixed frame 80, and an intermediate ring as fixed members fixed to the camera body 2.
  • Zoom ring 150 as a first ring rotatably supported by 140 and rear fixed frame 90
  • focus ring 130 as a second ring rotatably supported by filtering 120 and intermediate ring 140
  • zoom ring 150 An electric zoom mechanism 159 as a first electric mechanism driven by an operation and an electric focus mechanism 139 as a second electric mechanism driven by a rotation operation of the focus ring 130 are provided.
  • the focus ring 130 and the zoom ring 150 are not mechanically connected to the lens frame 20 and the lens frames 50 and 60 which are driven bodies, so that the rings 130 and 150 are operated.
  • the driving reaction force from the driven body is not transmitted to the fingertip, and it is difficult for the photographer to obtain an operational feeling.
  • the photographer cannot determine whether the fingertip operation he / she is performing is a focus operation or a zoom operation based on the operational feeling of the rings 130 and 150. Therefore, there is room for improvement from the viewpoint of suppressing erroneous operations during shooting.
  • the lens barrel 3 is a first torque applying unit that applies a torque in a direction opposite to the operation direction to the ring 150 when the zoom ring 150 is operated.
  • a first sliding surface 300 and a first receiving surface 400 that slides freely on the sliding surface 300 are provided.
  • the lens barrel 3 has a second sliding surface 500 as second torque applying means for applying a torque in the direction opposite to the operation direction to the ring 130 when the focus ring 130 is operated.
  • the second receiving surface 600 is slidably contacted with the second sliding surface 500.
  • each zoom ring 130, 150 when each zoom ring 130, 150 is operated, the operation direction with respect to each ring 130, 150 is determined by sliding friction between each sliding surface 300, 500 and its receiving surface 400, 600.
  • the reverse torque is applied. Accordingly, the photographer can feel the reverse torque with the fingertip when operating each of the rings 130 and 150 to obtain a feeling of operation.
  • the area A1 of the first sliding surface 300 formed on the zoom ring 150 is different from the area A2 of the second sliding surface 500 formed on the focus ring 130.
  • the feeling of operation when each ring 130, 150 is operated can be made different. Therefore, the photographer can recognize whether the fingertip operation he / she is performing is a focus operation or a zoom operation based on the difference in operation feeling. Therefore, it is possible to suppress erroneous operations during shooting.
  • the area A1 of the first sliding surface 300 formed on the zoom ring 150 is set larger than the area A2 of the second sliding surface 500 formed on the focus ring 130.
  • the frictional resistance between the sliding surface 300 of the zoom ring 150 and the receiving surface 400 (that is, the torque generated by the first torque applying means) is caused between the sliding surface 500 of the focus ring 130 and the receiving surface 600 thereof. It becomes larger than the frictional resistance (torque by the second torque applying means).
  • the same operational feeling as that of the conventional lens barrel in which the cam mechanisms are linked to the rings 130 and 150 that is, the operational feeling that the operating feeling of the zoom ring 150 is heavier than the operating feeling of the focus ring 130 is obtained. be able to.
  • the lens barrel 3 further includes grease interposed between the focus ring 130 and its supporting member (filtering 120 and intermediate ring 140) as the first torque applying means, and the second torque.
  • the applying means there is further provided a grease interposed between the zoom ring 150 and its supporting members (the rear fixed frame 90 and the intermediate ring 140).
  • the torque ratio at the time of operation of the zoom ring 150 and the focus ring 130 is set to 1.2 times or more after intensive research, the photographer feels the torque difference between 130 and 150 of each ring.
  • the torque when operating the zoom ring 150 is set to 1.2 times or more, more preferably 1.3 times or more than the torque when operating the focus ring 130.
  • the photographer can surely recognize whether the operation of the fingertip being performed is a focus operation or a zoom operation.
  • the rings 130 and 150 are rotatable by 360 degrees or more. In such a lens barrel 3, it is difficult to obtain an operational feeling of the rings 130 and 150. Therefore, providing the first torque applying means and the second torque applying means as described above is particularly useful for suppressing an erroneous operation of the photographer. It is.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2008-176128
  • a focus cam mechanism and a zoom cam interlocked with a zoom ring are respectively connected to a focus lens and a zoom lens.
  • the mechanism can be driven in the direction of the optical axis.
  • Patent Document 2 Japanese Patent Laid-Open No. 2010-49203 (hereinafter referred to as Patent Document 2), only the zoom lens is driven by a cam mechanism interlocked with the zoom ring, and the focus lens is driven by an electric actuator. Yes.
  • This electric actuator is driven and controlled by the lens microcomputer according to the rotation angle of the zoom ring during autofocusing, and is driven and controlled according to the rotation angle of the focus ring during manual focusing.
  • the rotation angle of the zoom ring is detected by a linear position sensor.
  • the rotation angle of the focus ring is detected by a transmissive photosensor.
  • the detection signal of each sensor is transmitted to the lens microcomputer.
  • the photosensor includes a light emitting side plate portion that holds a light emitting element, a light receiving side plate portion that holds a light receiving element, and a connecting plate portion that connects one end portions of both plate portions.
  • a plurality of protrusions arranged in the circumferential direction are formed on the inner peripheral surface of the focus ring, and the photosensor is disposed so as to sandwich the plurality of protrusions between the light emitting side plate part and the light receiving side plate part.
  • the lens barrel shown in Patent Document 2 requires two sensors, a linear position sensor and a photo sensor, which increases the number of components, increases costs, and increases the size of the entire barrel. is there.
  • the lens barrel 3 includes a zoom ring 150 as a cylindrical first rotating frame that is rotated in the circumferential direction, and a focus ring as a cylindrical second rotating frame that is rotated in the circumferential direction. 130, an intermediate ring 140 as an intermediate frame disposed between the zoom ring 150 and the focus ring 130 and rotatably supporting the rings, and a first detector for detecting the rotation of the zoom ring 150.
  • Rotation detector 201 and a rotation detector 200 as a second detector for detecting the rotation of the focus ring 130, and the rotation detector 201 and the rotation detector 200 are disposed on the intermediate ring 140. It was.
  • the intermediate ring 140 is provided between the zoom ring 150 and the focus ring 130, the rotation detector 201 that detects the rotation of the zoom ring 150 on the intermediate ring 140, and the rotation of the focus ring 130 is detected. Since the rotation detector 201 is arranged, both the rotation detectors 200 and 201 can be unitized via the intermediate ring 140. Therefore, the rotation detectors 200 and 201 can be made compact, and the entire lens barrel can be downsized.
  • the both rotation detectors 200 and 201 are fixed in advance to the intermediate ring 140 and unitized, and the unitized one is the intermediate ring 140 on the camera body side. Therefore, it is not necessary to insert the rotation detectors 200 and 201 into the narrow space in the lens barrel 3 from the cylinder axis direction or to move the rotation detectors 200 and 201 in the radial direction in the lens barrel 3. Therefore, the assembling action of the lens barrel 3 can be facilitated. Further, it is not necessary to secure a space for moving the rotation detectors 200 and 201 in the radial direction in the lens barrel 3 in advance. Therefore, the entire lens barrel 3 can be downsized particularly in the radial direction.
  • the rotation detector 201 as the first detector and the rotation detector 200 as the second detector are respectively connected to the electric zoom mechanism 159 and the electric focus mechanism 139 via one flexible printed board 250. It is connected to.
  • the number of parts can be reduced and the lens barrel 3 can be downsized.
  • the configuration of the lens barrel 3 is not limited to the above embodiment. That is, any lens barrel can be adopted as long as it is a lens barrel.
  • the area A1 of the first sliding surface 300 formed on the zoom ring 150 and the second slide formed on the focus ring 130 are used.
  • the area A2 of the moving surface 500 is made different, but is not limited to this.
  • the areas of the sliding surfaces A1 and A2 are made the same while the viscosity and amount of grease are made different. May be. Further, instead of this grease, for example, a quick-drying lubricant or oil may be used.
  • a leaf spring may be interposed between the end faces of the rings 130 and 150 and the fixing member, and the spring constant of the leaf spring may be made different, or a rubber member may be interposed.
  • the rubber member may have a different surface adhesiveness and surface roughness.
  • the zoom ring 150 is used as the first ring and the focus ring 130 is used as the second ring.
  • the present invention is not limited to this.
  • a shutter speed adjustment ring is used.
  • an aperture ring an adjustment ring may be employed as the first ring, and an aperture ring may be employed as the second ring.
  • the transmission type photosensor is used as the rotation detectors 200 and 201.
  • the present invention is not limited to this.
  • a magnetic sensor or a reflection type photosensor is used. Also good.
  • the rotation angle of the focus ring 130 and the zoom ring 150 is 360 ° or more, but is not limited thereto, and may be limited to 360 ° or less, for example.
  • the lens barrel 3 is an interchangeable lens that can be attached to and detached from the camera body 2, but is not limited thereto.
  • the lens barrel 3 may be attached to the camera body 2 so as not to be detachable.
  • a lens barrel of a compact camera may be used.
  • the camera body 2 can employ any apparatus as long as it has an imaging function. That is, the camera body 2 can be a still camera, a video camera, a mobile phone or a mobile terminal provided with a camera unit, or the like.
  • the rotation angle of the focus ring 130 and the zoom ring 150 is 360 ° or more, but is not limited thereto, and may be limited to 360 ° or less, for example.
  • the torque applied to the focus ring 130 by the first torque applying means and the torque applied to the zoom ring 150 by the second torque applying means are the torque generated by the viscous resistance due to grease, and the sliding.
  • it is set as the sum with the friction torque produced by dynamic friction, it is not restricted to this, For example, you may consist only of friction torque.
  • the technology disclosed herein relates to a lens barrel, and in particular, a manually operated zoom ring for driving an electric zoom mechanism and a manually operated focus for driving an electric focus mechanism. It is useful for a lens barrel provided with a ring.

Landscapes

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

Abstract

La présente invention concerne un barillet d'objectif (3) équipé d'une bague de zoom (150) qui est soutenue rotative par une monture de fixation arrière (90) et une bague intermédiaire (140) ; d'une bague de mise au point (130) qui est soutenue rotative par une bague de filtre (120) et la bague intermédiaire (140) ; d'un mécanisme de zoom à actionnement électrique (159) qui est entraîné par le fonctionnement de la bague de zoom (150) ; et d'un mécanisme de mise au point à actionnement électrique (139) qui est entraîné par le fonctionnement de la bague de mise au point (130). Au moyen de cette configuration, seule une légère force est nécessaire au bout des doigts pour faire fonctionner les bagues (130, 150).
PCT/JP2012/002878 2011-08-25 2012-04-26 Barillet d'objectif WO2013027309A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-184191 2011-08-25
JP2011184191 2011-08-25

Publications (1)

Publication Number Publication Date
WO2013027309A1 true WO2013027309A1 (fr) 2013-02-28

Family

ID=47746086

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/002878 WO2013027309A1 (fr) 2011-08-25 2012-04-26 Barillet d'objectif

Country Status (1)

Country Link
WO (1) WO2013027309A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06186468A (ja) * 1992-12-18 1994-07-08 Toshiba Medical Eng Co Ltd レンズアタッチメント
JPH11160598A (ja) * 1997-11-28 1999-06-18 Nikon Corp レンズ鏡筒
JP2007034105A (ja) * 2005-07-29 2007-02-08 Canon Inc 光学機器、撮像装置および撮影レンズ
JP2010049203A (ja) * 2008-08-25 2010-03-04 Panasonic Corp レンズ鏡筒および撮像装置
JP2011033795A (ja) * 2009-07-31 2011-02-17 Canon Inc レンズ鏡筒
JP2011053240A (ja) * 2009-08-31 2011-03-17 Canon Inc 光学機器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06186468A (ja) * 1992-12-18 1994-07-08 Toshiba Medical Eng Co Ltd レンズアタッチメント
JPH11160598A (ja) * 1997-11-28 1999-06-18 Nikon Corp レンズ鏡筒
JP2007034105A (ja) * 2005-07-29 2007-02-08 Canon Inc 光学機器、撮像装置および撮影レンズ
JP2010049203A (ja) * 2008-08-25 2010-03-04 Panasonic Corp レンズ鏡筒および撮像装置
JP2011033795A (ja) * 2009-07-31 2011-02-17 Canon Inc レンズ鏡筒
JP2011053240A (ja) * 2009-08-31 2011-03-17 Canon Inc 光学機器

Similar Documents

Publication Publication Date Title
JP4332583B2 (ja) レンズ鏡筒およびこれを備えた撮像装置
US7747149B2 (en) Optical apparatus having image-blur correction/reduction system
JP5011793B2 (ja) レンズ鏡筒及び撮像装置
TWI320104B (en) Lens barrel
JP2006276240A (ja) ズームレンズ装置
JP4218964B2 (ja) レンズ装置および撮像装置
JP5436014B2 (ja) 像振れ補正装置
JP4193748B2 (ja) 沈胴式レンズ鏡筒および撮像装置
JP4821847B2 (ja) 光学部品の切換機構、レンズ鏡筒及び撮像装置
JP2002169074A (ja) レンズ鏡筒
US7679840B2 (en) Optical apparatus
JP4980176B2 (ja) 撮像装置
US20230142396A1 (en) Optical apparatus
WO2013027309A1 (fr) Barillet d'objectif
JP2006276242A (ja) ズームレンズ装置
JP2007272105A (ja) ズームレンズ鏡筒ユニット、撮像装置、カメラ、携帯情報端末装置および携帯電話機
JP3960245B2 (ja) 撮像装置
JP4387509B2 (ja) レンズ鏡筒およびこれを備えた光学機器
JP6136089B2 (ja) レンズ鏡筒及び撮像装置
JP2015083997A (ja) レンズ鏡筒
JP2006215421A (ja) レンズ鏡筒
JP4612910B2 (ja) レンズ装置および撮像装置
JP6971817B2 (ja) レンズ装置および撮像装置
JP2011048080A (ja) レンズ装置
JP2007034125A (ja) 光学機器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12825943

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12825943

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP