JP2010085897A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel for reducing transmission of sound generated from a diaphragm unit to other members. <P>SOLUTION: The lens barrel (100) includes a holding frame (2) fixed on a lens barrel body (1) and the diaphragm unit (3) for controlling a light amount of object light. The diaphragm unit (3) is held in a non-contact state with the holding frame (2). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus.

Conventionally, a lens barrel includes an aperture unit including aperture blades. The diaphragm unit is fixed to, for example, a holding frame attached to the lens barrel.
(For example, refer to Patent Document 1).
JP 2005-227568 A

  However, the diaphragm unit generates sound during operation due to friction of the diaphragm blades when the diaphragm blades are driven, the operation sound of the actuator that drives the diaphragm blades, and the like. Such a sound is transmitted through the holding frame that is in contact with the diaphragm member, and is transmitted and enlarged inside the lens barrel. These operation sounds may be felt harsh during shooting. In addition, in an imaging apparatus capable of shooting a moving image, this sound is captured together with the image during moving image shooting.

  The subject of this invention provides the lens-barrel which can reduce transmission to the other member of the sound generated from the aperture unit.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

The invention described in claim 1 includes a holding frame (2) fixed to the lens barrel body (1), and an aperture unit (3) for controlling the amount of subject light, and the aperture unit (3 ) Is held in a non-contact state with respect to the holding frame (2), the lens barrel (100).
The invention described in claim 2 is the lens barrel (100) according to claim 1, wherein the diaphragm unit (3) includes a voice coil (4) and an optical axis direction position adjusting magnet (5). The holding frame (2) is provided with a voice coil magnet (6) disposed to face the voice coil (4) in the optical axis direction and the optical axis position adjusting magnet (5). A lens barrel (100) characterized in that a first magnet (7) and a second magnet (8) are provided so as to face each other so as to be sandwiched in the axial direction.
The invention according to claim 3 is the lens barrel (100) according to claim 2, wherein the holding frame (2) includes an outer peripheral side of the aperture unit (3) and one side in the optical axis direction. The voice coil magnet (6) and the first magnet (7) are disposed in a portion surrounding the one side of the holding frame (2), and the second magnet (8). Is a lens barrel (100) characterized in that it is arranged in a portion surrounding the other side of the holding frame (2).
The invention according to claim 4 is the lens barrel (100) according to claim 2 or 3, wherein the voice coil (4) and the voice coil magnet (6) are surfaces perpendicular to the optical axis. The lens barrel (100) is characterized in that one pair is provided on two straight lines orthogonal to each other with the optical axis in the inside as an intersection.
The invention according to claim 5 is the lens barrel (100) according to claim 1, wherein the diaphragm unit (3) includes a radial position adjusting magnet (10) and an optical axis direction position adjusting. A magnet (5) is provided, and the holding frame (2) is provided with a third magnet arranged to face the radial position adjusting magnet (10) in the radial direction, and the optical axis direction position adjusting magnet (5). The lens barrel (100) is characterized in that a first magnet (7) and a second magnet (8) are disposed so as to sandwich the) in the optical axis direction.
A sixth aspect of the present invention is the lens barrel (100) according to the fifth aspect, wherein the holding frame (2) includes an outer peripheral side of the diaphragm unit (3) and the diaphragm unit (3). The first magnet (7) is disposed in a portion surrounding the one side of the holding frame (2), and the second magnet (8) is In the holding frame (2), the part surrounding the other side is arranged to face the first magnet (7), and the third magnet is arranged in the part surrounding the outer peripheral side in the holding frame (2). A lens barrel (100) characterized by
The invention described in claim 7 is the lens barrel (100) according to claim 5 or 6, wherein the radial position adjusting magnet (10) and the third magnet are centered on the optical axis. The lens barrel (100) is characterized in that the lens barrel is uniformly arranged at three locations in the circumferential direction.
Invention of Claim 8 is a lens-barrel (100) of any one of Claims 1-7, Comprising: In the outer peripheral side of the said aperture unit (3), or in the said holding frame (2) The lens barrel (100) is characterized in that a buffer member is disposed in at least one of the portions facing the outer peripheral side.
A ninth aspect of the present invention is the lens barrel (100) according to any one of the first to eighth aspects, wherein the aperture unit (3) has a communication unit, and is a wireless drive signal. Is transmitted through the lens barrel (100).
A tenth aspect of the present invention is an imaging apparatus (101) including the lens barrel (100) according to any one of the first to ninth aspects.
Note that the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another component.

  ADVANTAGE OF THE INVENTION According to this invention, the lens barrel which can reduce transmission to the other member of the sound generated from the aperture unit can be provided.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings and the like. Each figure shown below is provided with an XYZ orthogonal coordinate system for ease of explanation and understanding. In this coordinate system, the direction toward the left side as viewed from the photographer at the position of the camera when the photographer shoots a horizontally long image with the optical axis A being horizontal (hereinafter referred to as a normal position) is defined as the X plus direction. Further, the direction toward the upper side in the normal position is defined as the Y plus direction. Further, the direction toward the subject at the normal position is defined as the Z plus direction.

  FIG. 1 is a perspective view showing a camera 101 including a lens barrel 100 of the first embodiment. The camera 101 is an imaging device in which the lens barrel 100 is detachably attached to the camera body 102. In the present embodiment, the interchangeable lens barrel 100 that can be attached to and detached from the camera body 102 will be described. However, the present invention is not limited to this, and the lens barrel 100 is non-detachable (a lens integrated with the camera). Also good.

  2 is a partial cross-sectional view of the lens barrel 100, and FIG. 3 is a cross-sectional view of the lens barrel 100 of FIG. 2 cut along the line III-III. FIG. 3 is a reduced version of FIG. The lens barrel 100 includes a cylindrical barrel main body 1, and a holding frame 2 and a diaphragm unit 3 are disposed on the inner side thereof.

  The aperture unit 3 includes a plurality of aperture blades 3a, a blade storage portion 3b for storing the aperture blades 3a, and an outer peripheral portion 3c provided on the radially outer side of the blade storage portion 3b. A voice coil 4 formed in a substantially elliptical ring shape that is long in the X direction is arranged in the Y plus direction in the drawing at the outer peripheral portion 3c. Further, on the outer peripheral portion 3c, an optical axis direction position adjusting magnet 5 on the diaphragm unit 3 side, which is a substantially rectangular permanent magnet, is provided on a portion opposite to the voice coil 4 in the radial direction with respect to the optical axis A. ing.

  The holding frame 2 surrounds the outer peripheral side of the outer peripheral part 3c of the aperture unit 3 and extends along the inner peripheral surface of the barrel main body 1 and the image side (Z minus side) end of the outer cylindrical part 2a. And a front annular portion 2c extending radially inward from the subject side (Z plus side) end of the outer cylindrical portion 2a.

  On the Y plus side of the rear annular portion 2b, a voice coil magnet 6 and a yoke 9a, which are permanent magnets opposed to the voice coil 4, are disposed. Further, a yoke 9b facing the voice coil 4 is disposed on the Y plus side of the front annular portion 2c. A voice coil motor (hereinafter referred to as VCM) is configured by the voice coil 4, the voice coil magnet 6, and the yokes 9a and 9b. The aperture unit 3 is driven in the Y direction by this VCM.

  A frame-side first magnet 7 is disposed in a portion of the holding frame 2 that faces the voice coil magnet 6 in the radial direction. A frame-side second magnet 8 is disposed at a position facing the frame-side first magnet 7 in the front-side annular portion 2c with the diaphragm-side optical axis direction position adjusting magnet 5 interposed therebetween. The frame-side first magnet 7 and the frame-side second magnet 8 are permanent magnets and have a polarity opposite to the polarity of the opposing side surfaces of the aperture-side optical axis direction position adjusting magnet 5. By these frame side first magnet 7, aperture side optical axis direction position adjusting magnet 5, and frame side second magnet 8, the aperture unit 3 floats in the optical axis direction so as not to contact the holding frame 2 in the optical axis direction. It is held in the state.

  Three shock absorbers 12 are attached to the inner surface of the outer cylindrical portion 2a of the holding frame 2 so as to be separated from each other. The buffer material 12 buffers the collision between the aperture unit 3 and the holding frame 2. A communication unit 13 is attached to the side surface on the Z minus side of the blade storage unit 3b. The communication unit 13 wirelessly transmits a drive signal of the aperture unit 3 from a control unit (not shown). Further, the diaphragm unit 3 is provided with a blade driving unit 14 including an actuator (ex. Stepping motor) for driving the diaphragm blade 3a and a control unit for controlling the actuator. The blade drive unit 14 drives the blade 3 a based on a drive signal that is supplied with power through the communication unit 13 and received through the communication unit 13.

The voice coil 4 of the VCM is configured to be energized when the camera is in a shooting preparation state and a shooting operation state. When driving the aperture during shooting, of course, the aperture is functioning, such as when performing photometry as a preparatory operation before shooting, AF detection and AF driving, and when shooting is actually taking place. When necessary, the voice coil 4 is kept energized. As an example, when the power switch of the camera is turned on and is not in a non-shooting state (when the camera is not in a playback mode or a setting mode using a menu screen), the voice coil is energized.
When a current is passed through the voice coil 4 of the VCM via the communication unit 13, the voice coil 4 receives a force in the Y direction in FIG. 2, and the diaphragm unit 3 is driven in the same direction. By this driving, the aperture unit 3 is held in a non-contact state, that is, in a floating state with respect to the holding frame 2 in the Y direction. On the other hand, due to the interaction with the aperture side optical axis direction position adjusting magnet 5, the frame side first magnet 7 and the frame side second magnet 8, the aperture unit 3 is held in a non-contact state, that is, in a floating state also in the Z direction. Is done.
When the voice coil 4 of the VCM is not energized, the aperture unit 3 is supported by the holding frame 2 through contact support to any two of the three cushioning materials 12.

As described above, this embodiment has the following effects.
(1) Since the aperture unit 3 is held in a non-contact state with respect to the holding frame 2 fixed to the lens barrel main body 1, the sound generated from rubbing the aperture blades 3 a of the aperture unit, It is possible to prevent the operating sound of the actuator that drives the diaphragm blades from being transmitted to the outside of the lens barrel 100.
(2) The non-contact holding of the diaphragm unit 3 is performed by the voice coil motor VCM for adjusting the radial position of the diaphragm unit 3 and by the permanent magnet for adjusting the position of the optical axis direction. The required space can be reduced.
(3) Since the three cushioning materials 12 are spaced apart from each other in the circumferential direction, the impact can be reduced.
(4) Since the communication unit 13 is provided in the diaphragm unit 3 and the diaphragm unit 3 is wirelessly controlled, noise due to vibrations transmitted through the wiring can be prevented.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 is a partial cross-sectional view of a lens barrel 200 according to the second embodiment of the present invention, and FIG. 5 is a cross-sectional view of the lens barrel 200 of FIG. 4 cut along the line VV. In the second embodiment, members that are the same as or similar to those in the first embodiment described above are assigned the same reference numerals and descriptions thereof are omitted.

  The second embodiment is different from the first embodiment in that the position adjustment in the Y direction of the diaphragm unit 3 does not use a VCM, but a diaphragm side radial position adjustment which is a permanent magnet arranged in pairs. The magnet 10 for a frame and the 3rd magnet 11 on the frame side are used.

  The diaphragm side radial position adjusting magnet 10 is provided on the outer peripheral part 3 c of the diaphragm unit 3, and the frame side third magnet 11 is provided on the inner surface of the outer cylindrical part 2 a of the holding frame 2 for adjusting the diaphragm side radial position. It is attached so as to face the magnet 10. As shown in FIG. 4, three pairs of the diaphragm side radial position adjusting magnet 10 and the frame side third magnet 11 are provided equally spaced in the circumferential direction, and each pair of diaphragm side radial position adjusting magnets is used. The opposing side surfaces of the magnet 10 and the frame side third magnet 11 are arranged to have the same polarity.

  According to the present embodiment, the diaphragm unit 3 is held in a non-contact state, that is, in a floating state on the optical axis A by the repulsive action of the diaphragm side radial position adjusting magnet 10 and the frame side third magnet 11 in the radial direction. In the optical axis A direction, the aperture side optical axis direction position adjusting magnet 5, the frame side first magnet 7 and the frame side second magnet 8 are held in a non-contact state, that is, in a floating state.

As mentioned above, according to 2nd Embodiment, in addition to the effect of 1st Embodiment, it has the following effects.
(1) Since the radial position adjustment of the aperture unit 3 is performed by the aperture side radial position adjustment magnet 10 and the frame side third magnet 11 which are permanent magnets, the space required for the non-contact holding structure can be further reduced. In addition, the lens barrel 100 can be provided at a lower cost.
(2) The radial position adjustment of the aperture unit 3 is performed by uniformly arranging the three pairs of aperture side radial position adjusting magnets 10 and the frame side third magnet 11 in the circumferential direction. The center can be aligned with the optical axis with high accuracy.

(Deformation)
The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
(1) In the above-described embodiment, the front-side annular portion 2c and the rear-side annular portion 2b of the holding frame 2 are annular discs. However, the present invention is not limited thereto, and the front annular portion 2c and the rear annular member 2b may be formed by extending a portion necessary for holding a magnet or the like from the lens barrel body 1 inward in the radial direction. Good.
(2) In the first embodiment, the cushioning material 12 is provided on the outer cylindrical portion 2a of the holding frame 2. However, the cushioning material 12 is provided on the outer peripheral portion 3c of the aperture unit 3 or on both. May be.
(3) In the above-described embodiment, the communication unit 13 is provided on the side surface on the Z minus side of the blade storage unit 3b. However, the present invention is not limited to this, and for example, a drive signal is transmitted to the aperture unit 3 via electrical wiring. You can also do it. In this case, it is preferable that the electrical wiring is loosened so that sound is difficult to transmit.
(4) In the first embodiment, one VCM is arranged. However, the present invention is not limited to this, and two VCMs are arranged so as to adjust the two directions of the X direction and the Y direction as shown in FIG. May be. By providing in two directions, the X direction and the Y direction, it is possible to more accurately hold the diaphragm unit 3 with respect to the holding frame 2 and further reduce the possibility of contact between the two.
In addition, although embodiment and a deformation | transformation form can also be used in combination suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

It is a perspective view which shows the camera containing the lens barrel of 1st Embodiment. It is a fragmentary sectional view of the lens barrel concerning a 1st embodiment. It is sectional drawing which cut | disconnected the lens-barrel of FIG. 1 along the II-II line. It is a fragmentary sectional view of the lens barrel concerning a 2nd embodiment of the present invention. It is sectional drawing which cut | disconnected the lens-barrel of FIG. 1 along the IV-IV line. It is a figure which shows the modification of 1st Embodiment.

Explanation of symbols

  1: casing body, 2: holding frame, 3: aperture unit, 4: voice coil, 5: aperture-side optical axis position adjusting magnet, 6: voice coil magnet, 7: frame-side first magnet, 8: Frame side second magnet, 10: Diaphragm side radial position adjusting magnet, 11: Frame side third magnet, 100, 200: Lens barrel, 101: Camera

Claims (10)

A holding frame fixed to the lens barrel body;
An aperture unit that controls the amount of subject light,
The aperture unit is held in a non-contact state with respect to the holding frame;
A lens barrel characterized by The lens barrel according to claim 1,
The diaphragm unit is provided with a voice coil and an optical axis direction position adjusting magnet,
The holding frame includes a first coil and a second magnet that are disposed so as to be opposed to each other so as to sandwich the voice coil magnet arranged in the optical axis direction and the voice coil position adjusting magnet in the optical axis direction. Is provided,
A lens barrel characterized by The lens barrel according to claim 2,
The holding frame surrounds the outer peripheral side of the aperture unit, and one side and the other side in the optical axis direction,
The voice coil magnet and the first magnet are arranged in a portion surrounding the one side of the holding frame,
The second magnet is disposed in a portion surrounding the other side of the holding frame;
A lens barrel characterized by The lens barrel according to claim 2 or 3,
The voice coil and the magnet for the voice coil are provided in pairs on two straight lines orthogonal to each other with the optical axis in the plane perpendicular to the optical axis as an intersection;
A lens barrel characterized by The lens barrel according to claim 1,
The aperture unit is provided with a radial position adjusting magnet and an optical axis direction position adjusting magnet,
The holding frame includes a third magnet disposed opposite to the radial position adjusting magnet in the radial direction, a first magnet disposed opposite to the optical axis position adjusting magnet in the optical axis direction, and a first magnet. 2 magnets are provided,
A lens barrel characterized by The lens barrel according to claim 5,
The holding frame surrounds the outer peripheral side of the aperture unit, and one side and the other side in the optical axis direction of the aperture unit,
The frame-side first magnet is disposed in a portion surrounding the one side of the holding frame,
The frame-side second magnet is disposed in a portion of the holding frame surrounding the other side;
The frame-side third magnet is disposed in a portion of the holding frame surrounding the outer peripheral side;
A lens barrel characterized by The lens barrel according to claim 5 or 6,
The radial position adjusting magnet and the third magnet are equally disposed at three locations in the circumferential direction around the optical axis;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 7,
A buffer member is disposed on at least one of the outer peripheral side of the aperture unit or the portion of the holding frame facing the outer peripheral side;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 8,
The aperture unit has a communication unit, and a drive signal is transmitted wirelessly.
A lens barrel characterized by   An imaging device comprising the lens barrel according to any one of claims 1 to 9.

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