JP2018128610A - Optical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device and a lens barrel that can be miniaturized while suppressing malfunctions in operation. A light amount adjusting unit including a diaphragm base member and a plurality of diaphragm blades, a shift unit including a shift optical system and a shift lens barrel for holding the shift optical system, and a shift base unit including a base member are provided. The shift unit is provided with respect to the shift base unit, and the image shake correction unit is urged by the urging member via a plurality of rolling members. The light amount adjusting unit is arranged so as to be adjacent to the shift unit and shifts. A plurality of first abutting portions are provided on the light amount adjusting unit side of the lens barrel, and a plurality of a plurality of abutting portions capable of contacting each of the plurality of first abutting portions are provided on the shift lens barrel side of the aperture base member. A second contact portion is provided. [Selection diagram] Fig. 1

Description

  The present invention relates to an optical apparatus.

  In optical devices such as cameras, video cameras, and interchangeable lenses, image blur correction has a configuration that can drive the optical element in the direction orthogonal to the optical axis (shift direction) so as to suppress image blur caused by camera shake of the photographer. The device is known.

  Patent Document 1 includes a base member and a shift member that holds a vibration isolating element and is movable in the shift direction, and the shift member is disposed via a rolling ball disposed between these members. An image blur correction device that biases a base member by a spring is disclosed. In such a configuration, the impact receiving portion is provided so that the rolling ball does not fall off when an impact due to an external force is applied, that is, the interval between the base member and the shift member is not inadvertently widened. . As the impact receiving portion, a part of a member fixed in the optical axis direction constituting the apparatus main body or a new member is used.

  Further, in Patent Document 2, in order to avoid malfunctions due to the collision of the glass with the diaphragm blades and the collision of the glass or the shift member with the diaphragm unit, a light quantity adjustment unit that is a driving member and an image blur correction unit are provided. A lens barrel having a secured clearance is disclosed.

JP 2013-92563 A JP 2013-47730 A

  In the interchangeable lens of the standard zoom system, the total length can be shortened by sequentially arranging the light amount adjustment unit and the image shake correction unit in order from the subject side.

  In such a configuration, since there is no fixing member for providing the impact receiving portion disclosed in the image blur correction apparatus of Patent Document 1, it is necessary to add a new part as the impact receiving portion. However, the addition of parts increases the size of the device.

  Further, when the light amount adjustment unit and the image blur correction device are disposed adjacent to each other, the clearance between the light amount adjustment unit and the image blur correction unit cannot be ensured, which may cause a malfunction of the operation.

  In view of such a problem, an object of the present invention is to provide an optical apparatus that can be miniaturized while suppressing malfunction of operation.

  An optical apparatus according to one aspect of the present invention includes a light amount adjustment unit including an aperture base member and a plurality of aperture blades, a shift optical system and a shift unit including a shift barrel that holds the shift optical system, and a base member. A shift base unit, and an image blur correction unit that biases the shift unit with respect to the shift base unit by a biasing member via a plurality of rolling members, and the light amount adjustment unit is The shift unit is disposed adjacent to the shift unit, and a plurality of first contact portions are provided on the light amount adjustment unit side of the shift barrel. A plurality of second contact portions that can contact each of the plurality of first contact portions are provided.

  ADVANTAGE OF THE INVENTION According to this invention, the optical apparatus which can be reduced in size can be provided, suppressing the malfunction of operation | movement.

It is a schematic sectional drawing of the lens barrel which is an example of the optical apparatus which concerns on embodiment of this invention. It is a disassembled perspective view of the image blur correction unit mounted on the lens barrel. FIG. 3 is a diagram of an image shake correction unit viewed from the subject side. It is a disassembled perspective view of the light quantity adjustment unit mounted in the lens barrel. FIG. 6 is a view of a state in which a light amount adjustment unit is attached to an image shake correction unit as viewed from the subject side. It is the figure which looked at the light quantity adjustment unit from the shift unit side. It is sectional drawing of the state which attached the light quantity adjustment apparatus to the image blurring correction unit. It is the schematic of the imaging device which is an example of the optical instrument which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic cross-sectional view of a lens barrel 100 that is an example of an optical apparatus according to an embodiment of the present invention. In the present embodiment, a lens barrel that is detachably attached to a camera body will be described as an example of an optical device, but the present invention is not limited to this. For example, as shown in FIG. 8, the optical apparatus is configured by integrating a lens barrel LB that holds an imaging optical system (imaging optical system) IOS and a camera body CB that holds the imaging element IE. It may be an imaging device.

  A mount 101 used when attaching the lens barrel 100 to the camera body holds a cover glass 121. The outer ring 102 is fitted to the mount 101 so that the movement in the optical axis direction is restricted, and is fastened with screws. The guide tube 103 is fitted to the exterior ring 102 in a diameter so that movement in the optical axis direction is restricted, and is fastened with screws. The cam ring 104 is bayonet-coupled to the guide tube 103 while being fitted to the guide tube 103 in diameter, thereby restricting movement in the optical axis direction and rotating at a fixed position.

  The first group barrel 105 holds a lens and is screwed to the filter frame 106. The guide tube 103 and the cam ring 104 are formed with a rectilinear groove (not shown) and a cam groove (not shown) that engage with a cam follower (not shown) provided on the filter frame 106 and guide the filter frame 106 in a straight line. ing.

  The second group barrel 107 holds a lens and is suspended from a second group base 108. The guide cylinder 103 and the cam ring 104 have a rectilinear groove (not shown) and a cam groove (not shown) that engage with a cam follower (not shown) provided in the second group base 108 and guide the second group base 108 in a straight line. Is formed.

  The rear group unit in which the aperture unit 109, the third group unit 110, the fourth group lens barrel 111, and the fifth group lens barrel 112 are integrally coupled is advanced and retracted along the optical axis by the guide tube 103 and the cam ring 104. The guide tube 103 and the cam ring 104 are engaged with a cam follower (not shown) attached to a third group base member 113 in the third group unit 110, and a rectilinear groove (not shown) for guiding the rear group unit straightly, A cam groove (not shown) is formed.

  The fourth group barrel 111 is a focus group, and is held by a guide bar 115 extending along the optical axis so as to be slidable along the optical axis. Both ends of the guide bar 115 are held by the third group base member 113 and the adjustment piece 114. The adjustment piece 114 is in contact with and fixed to the fifth group barrel 112. The fifth group lens barrel 112 is engaged with the third group base member 113, the positioning pin, and the hole to determine the radial position, and is contacted in the optical axis direction and fastened with screws.

  The driving means for advancing and retracting the fourth group barrel 111 along the optical axis is engaged with a feed screw (not shown), a feed screw (not shown) rotated by the motor, and a feed screw. And a rack (not shown) that converts the rotation of the motor into a driving force in the optical axis direction.

  The rack is rotatably held around an axis (not shown) extending along the optical axis by the fourth group barrel 111, and moves the fourth group barrel 111 forward and backward along the optical axis. The rack is biased in the rotational direction by a biasing force in a twisting direction of a torsion coil spring (not shown), and is pressed against the feed screw and the guide bar 115 from one of the radial directions. The rack is urged by the urging force of the torsion coil spring in the optical axis direction and is pressed against the fourth group barrel 111 from one direction in the optical axis direction. The rack, the feed screw, the guide bar 115, and the fourth group barrel 111 are pressed against each other by these urging forces, and rattling between these members is prevented.

  Since the zoom operation ring 116 is bayonet-coupled to the exterior ring 102, the movement in the optical axis direction is restricted and rotates at a fixed position. A zoom key (not shown) is fixed to the outer diameter portion of the cam ring 104. When the zoom key engages with the zoom operation ring 116, the cam ring 104 is interlocked with the rotation of the zoom operation ring 116 around the optical axis. Rotates.

  The focus ring 117 is sandwiched between the outer ring 102 and the restriction frame 118 in the optical axis direction, so that the movement in the optical axis direction is restricted, and the diameter of the focus ring 117 is fitted to the outer ring 102. The restriction frame 118 is diameter-fitted to the exterior ring 102 and abuts on the subject side end surface of the exterior ring 102. The restriction frame 118 is fastened to the exterior ring 102 by a plurality of integrally formed elastic pawls (not shown) having elasticity.

  The flange part 119 is provided in the inner peripheral part of the focus ring 117, and is provided with a periodic slit shape in the circumferential direction. A detection member (not shown) for detecting the rotation amount and the rotation direction of the focus ring 117 has a predetermined interval in the circumferential direction so as to optically detect the movement of the slit shape provided in the flange portion 119 in the rotation direction. It is comprised by two photo interrupters arranged by. The fourth group lens barrel 111 advances and retreats along the optical axis as the motor rotates by a predetermined drive signal from the control circuit on the substrate 120 based on the output of the detection member.

  A focus reset switch (not shown) incorporated in the third group base member 113 is configured by a photo interrupter that optically detects the movement of the light shielding wall (not shown) formed in the fourth group barrel 111 in the optical axis direction. Has been. The focus reset switch is provided to detect that the fourth group barrel 111 is located at the reference position.

  FIG. 2 is an exploded perspective view of the third group unit (image blur correction unit) 110. FIG. 3 is a diagram of the third group unit 110 as viewed from the subject side.

  A shift member (shift lens barrel) 13 holds an optical element (shift optical system) 12 that performs image shake correction, and moves in a direction orthogonal to the optical axis to the base member 11 via three balls (rolling members) 14. Supported as possible. Further, the shift member 13 is urged by the three coil springs (biasing members) 15 to the base member 11 through the three balls 14 in the optical axis direction.

  Each of the three balls 14 has the same diameter, and is disposed between the base member 11 and the shift member 13 in the optical axis direction. The three balls 14 are formed of a non-magnetic material such as SUS304 so as not to be attracted by the driving magnet 16 disposed in the vicinity.

  The three coil springs 15 are made of a nonmagnetic material such as phosphor bronze so as not to be attracted to the driving magnet 16 disposed in the vicinity.

  The drive magnet 16 is fixed to the shift member 13 by adhesion. The drive magnet 16 is magnetized in four poles so that an equal magnetic force is generated in a predetermined direction. That is, the drive magnet 16 is configured to have a different polarity so that the plane direction is divided into two equal parts, and to have a different polarity so that the thickness direction orthogonal to the plane direction is also divided into two equal parts.

  The yoke 17 is fixed to the shift member 13 by heat caulking. The yoke 17 is made of a magnetic material such as SPCC in order to close the magnetic flux toward the front side of the drive magnet 16.

  The coil unit 18 includes a bobbin 20 and a coil 19 wound around the bobbin 20. When a current is passed through the coil unit 18, a Lorentz force is generated in a direction substantially orthogonal to the longitudinal direction of the coil unit 18 due to repulsion between the lines of magnetic force generated in the drive magnet 16 and the coil unit 18. Thereby, the shift member 13 moves in the optical axis orthogonal direction.

  The two sets of driving magnets 16 and the coil unit 18 are arranged along two directions orthogonal to each other. Therefore, the shift member 13 can move within a predetermined range in the two optical axis orthogonal directions orthogonal to each other.

  In the following description, a drive unit including the optical element 12, the shift member 13, the drive magnet 16 and the yoke 17 is referred to as a shift unit S. A unit composed of the base member 11 and the coil unit 18 is referred to as a shift base unit SB.

  As shown in FIG. 3, each first end of the coil spring 15 is hung on a spring hook 11 a provided on the base member 11. The second ends of the coil springs 15 are hooked on spring hooks 13a, 13b and 13c provided on the shift member 13, respectively. Each of the spring hooking portions 13a to 13c is provided on the diaphragm unit 109 side (light quantity adjustment unit side) so as to contact a member provided on the diaphragm unit 109 described later.

  In FIG. 3, a broken line mm represents a line orthogonal to the optical axis of the optical element 12. A one-dot chain line nn represents a straight line connecting the fixed portions of the aperture unit 109 and the third group unit 110. Point o represents the optical axis position. The point p represents the position of the center of gravity of the shift unit S.

  FIG. 4 is an exploded perspective view of the aperture unit (light quantity adjustment unit) 109. A blade chamber is formed between the annular base member 51 and the cover member 54 formed in an annular shape. In the blade chamber, a plurality of diaphragm blades 52 and a diaphragm drive ring 53 are arranged.

  The diaphragm base member 51 has a plurality of cam grooves for sliding projections provided on the diaphragm base member 51 side of the diaphragm blade 52. The aperture drive ring 53 is provided with aperture blade mounting holes for mounting the aperture blades 52 corresponding to the protrusions provided on the cover member 54 side of the aperture blades 52. The aperture drive ring 53 rotates within a predetermined drive range by transmitting the rotation of the motor 56 to the gear portion of the aperture drive ring 53 via the pinion gear 55. As the diaphragm drive ring 53 rotates, the protrusion provided on the diaphragm base member 51 side of the diaphragm blade 52 slides in the cam groove of the diaphragm base member 51, and the light quantity is adjusted.

  The screw 57 fixes the motor 56 to the cover member 54. The flexible substrate 58 supplies power to the motor 56. The photo interrupter 59 detects the open state of the aperture blade 52.

  FIG. 5 is a view of the state in which the aperture unit 109 is attached to the third group unit 110 as viewed from the subject side. The screw 60 fixes the aperture unit 109 to the third group unit 110.

  FIG. 6 is a view of the aperture unit 109 as viewed from the shift unit S side (mount 101 side, imaging surface side) of the third group unit 110. On the shift member 13 side (shift lens barrel side) of the aperture base member 51, the contact portions (second contact portions) that can contact the spring hook portions (first contact portions) 13a, 13b, and 13c of the shift member 13, respectively. 51a, 51b, 51c. In the present embodiment, the spring hook portions 13a to 13c and the contact portions 51a to 51c are formed as convex portions, but may be formed in other shapes as long as they can contact each other.

  FIG. 7 is a cross-sectional view of the third group unit 110 with the aperture unit 109 attached. The shift unit S and the aperture unit 109 are normally adjacent to each other with a predetermined distance apart, but can be adjacent to each other when, for example, an impact is applied from the outside.

  Hereinafter, a case where the lens barrel 100 receives an impact from the outside will be described. The shift unit S is restricted from moving to the mount 101 side (imaging surface side) in the optical axis direction by the shift base unit SB (base member 11 and ball 14). However, the shift unit S may move toward the subject in the optical axis direction if a force that opposes the urging force of the coil spring 15 is applied.

  In the present embodiment, when the shift unit S moves to the subject side, the spring hooking portions 13 a to 13 provided on the shift member 13 come into contact with the contact portions 51 a to 51 c provided on the aperture base member 51, respectively. Therefore, it is possible to prevent the optical element 12 from coming into contact with the diaphragm unit 109, or a part of the shift unit S from coming into contact with the diaphragm blades 52 of the diaphragm unit 109 to be scratched or hindering the operation of the diaphragm blades 52. can do. In the present embodiment, the shift member 13 and the aperture base member 51 are configured to be able to abut at three locations, but the present invention is not limited to this.

  Hereinafter, the arrangement of the aperture unit 109 and the third group unit 110 will be described.

  As described above, the diaphragm unit 109 is screw-fixed to the third group unit 110 at two locations. In the present embodiment, as shown in FIG. 3, the diaphragm unit 109 and the third group unit 110 are arranged so that the center of gravity of the shift unit S represented by the point p is two screw fixing portions when viewed in the optical axis direction. It is comprised so that it may be located on the straight line nn which connects. The screw fixing portion is a region where the aperture unit 109 and the third group unit 110 are fixed by the screw 60. Further, the position of the center of gravity of the shift unit S may be a position that is substantially regarded as being on the straight line nn even if it is not strictly located on the straight line nn.

  Further, at least a part of the spring hooks 13a and 13b and at least a part of the contact parts 51a and 51b are also located on a straight line nn as viewed in the optical axis direction, as shown in FIGS. It is configured as follows. Note that at least a part of the spring hooks 13a and 13b and at least a part of the contact parts 51a and 51b are substantially regarded as being on the straight line nn even if they are not strictly located on the straight line nn. Any position can be used. Furthermore, the spring hooking portion 13c and the contact portion 51c are configured to be located on the opposite side of the straight line nn with respect to the optical axis position represented by the point o when viewed in the optical axis direction.

  By disposing the aperture unit 109 and the third group unit 110 as described above, the shift unit S contacts the aperture base member 51 so that the aperture unit 109 and the third group unit 110 can withstand an impact by the screw fixing portion. You can touch. Thereby, the moment applied to the aperture unit 109 when the shift unit S contacts the aperture base member 51 can be suppressed. Thereby, the moment in the optical axis direction of the aperture unit 109 and the shift unit S at a position away from the straight line nn can also be suppressed.

  As described above, in the lens barrel 100 of the present embodiment, since the moment applied to the aperture unit 109 can be suppressed even when the shift unit S moves in the optical axis direction due to an external impact, the aperture unit 109 can be suppressed. 109 inactivation can be suppressed. Accordingly, the aperture unit 109 that is a light amount adjustment unit and the third group unit 110 that is an image shake correction unit can be disposed adjacent to each other, and thus the lens barrel 100 can be reduced in size.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

11 Base member 12 Optical element (shift optical system)
13 Shift member (shift barrel)
13a, 13b, 13c Spring hook portion (first contact portion)
14 balls (rolling member)
15 Coil spring (biasing member)
18 Coil unit 51 Diaphragm base members 51a, 51b, 51c Contact part (second contact part)
52 Aperture blade 109 Aperture unit (light intensity adjustment unit)
110 3 group unit (image blur correction unit)
S Shift unit SB Shift base unit

Claims (10)

A light amount adjustment unit including an aperture base member and a plurality of aperture blades;
A shift unit including a shift optical system and a shift lens barrel that holds the shift optical system, and a shift base unit including a base member. The shift unit with respect to the shift base unit, and a plurality of rolling members. An image blur correction unit that is biased by a biasing member via
The light amount adjustment unit is arranged to be adjacent to the shift unit,
A plurality of first contact portions are provided on the light amount adjustment unit side of the shift barrel,
An optical apparatus, wherein a plurality of second contact portions capable of contacting each of the plurality of first contact portions are provided on the shift barrel side of the aperture base member.   The optical apparatus according to claim 1, wherein the shift base unit includes a plurality of coil units. The light amount adjustment unit is fixed to the shift base unit with at least two fixing parts,
3. The optical apparatus according to claim 1, wherein the center of gravity of the shift unit is located on a straight line connecting the two fixed portions when viewed in the optical axis direction.   At least a part of each of the two first contact portions of the plurality of first contact portions, and at least each of the two second contact portions of the plurality of second contact portions. The optical apparatus according to claim 3, wherein a part of the optical device is located on a straight line connecting the two fixing portions.   One second contact portion among the plurality of second contact portions is located on the side opposite to the straight line connecting the two fixed portions with respect to the optical axis when viewed in the optical axis direction. The optical apparatus according to claim 3 or 4, characterized in that:   The optical apparatus according to claim 1, wherein each of the plurality of first contact portions is a convex portion.   The optical apparatus according to claim 1, wherein each of the plurality of second contact portions is a convex portion.   The optical apparatus according to claim 1, wherein the optical apparatus is a lens barrel including an imaging optical system.   The optical apparatus according to claim 1, wherein the optical apparatus is a lens barrel that is detachably attached to an imaging apparatus.   8. The image pickup apparatus according to claim 1, wherein the optical apparatus is an image pickup apparatus including a lens barrel that holds an imaging optical system and a camera main body that holds an image pickup device. 9. Optical equipment.