JP2016166964A - Optical apparatus having image blur correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical apparatus having an image blur correction device capable of achieving downsizing.SOLUTION: The optical apparatus includes: a lens holding member for holding an anti-vibration lens; a base member for supporting the lens holding member so as to shift it in a direction orthogonal to an optical axis; at least three balls held between the lens holding member and the base member; a plurality of spring members each of which one end is attached to the base member, the other end is attached to the lens holding member and is arranged obliquely to an optical axis direction and a shift direction to hold the balls and hold the lens of the lens holding member around the optical axis; and a plurality of actuators composed of coils fixed on the lens holding member and magnets fixed on the base member. A lens holding member side spring fixing portion 1 for fixing the spring members and a base member side spring fixing portion 2 for fixing the spring members are respectively formed as projection shapes extended from the lens holding member side to the base member side in the optical axis direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical apparatus including an image blur correction device that reduces image blur.

  Conventionally, an optical image stabilizer that shifts an image stabilizer lens (hereinafter referred to as a shift lens) in a direction orthogonal to the optical axis direction is disclosed in Patent Document 1.

  This optical image stabilizer includes a lens holding member that holds a shift lens, and a base member that supports the lens holding member so as to be movable in a shift direction orthogonal to the optical axis direction of the shift lens. In addition, both ends of a spring member arranged to be inclined with respect to the optical axis direction and the shift direction are attached to a plurality of locations in the circumferential direction of the lens holding member and the base member. These spring members urge the lens holding member toward the neutral position in the shift direction and urge the lens holding member toward the base member in the optical axis direction. A plurality of balls are disposed between the lens holding member and the base member, and the balls guide the lens holding member in the shift direction with respect to the base member. Further, an actuator that drives the lens holding member in the shift direction with respect to the base member is configured by a coil attached to the lens holding member and a magnet attached to the base member (Patent Document 1).

JP 2010-39083 A

  However, in the prior art disclosed in Patent Document 1 described above, the spring member and the ball member are arranged in the same phase as viewed in the optical axis direction, and the spring member and the ball member do not interfere with each other. Must be placed. As a result, the size is increased in the radial direction and the optical axis direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical apparatus having an image blur correction device that can be downsized.

In order to achieve the above object, an optical apparatus having the image blur correction device of the present invention includes:
A lens holding member for holding an anti-vibration lens;
A base member that movably supports the lens holding member in a shift direction orthogonal to the optical axis direction;
At least three balls sandwiched between surfaces perpendicular to the optical axis of the lens holding member and the base member;
One end is attached to the base member and the other end is attached to the lens holding member, and is inclined with respect to the optical axis direction and the shift direction. The ball holding and the lens of the lens holding member are centered on the optical axis. A plurality of spring members to be held;
The plurality of actuators that drive the lens holding member in the shift direction with respect to the base member include a coil fixed to the lens holding member and a magnet fixed to the base member.
A spring fixing portion 1 on the lens holding member side for fixing the spring member and a spring fixing portion 2 on the base member side for fixing the spring member extend from the lens holding member side to the base member side in the optical axis direction. It has a protruding shape.

  ADVANTAGE OF THE INVENTION According to this invention, provision of the optical device which has an image blur correction apparatus which enabled realization of size reduction is realizable.

Sectional drawing of the image blurring correction apparatus concerning one Example of this invention 1 is a perspective view of a main part of a lens barrel 10 according to an embodiment of the present invention. 1 is an exploded perspective view (front side) of an image blur correction device according to an embodiment of the present invention. 1 is an exploded perspective view (back side) of an image blur correction device according to an embodiment of the present invention. 1 is a rear view of an image blur correction apparatus according to an embodiment of the present invention. 1 is a rear view of a part of an image blur correction apparatus according to an embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  A lens barrel 10 according to a first embodiment of the present invention will be described. FIG. 2 is a perspective view of a main part of the lens barrel 10.

  Reference numerals 11 and 12 denote shake detection sensors that detect shake given to the lens barrel 10. The shake detection sensor 11 detects vertical shake (pitch shake), and the shake detection sensor 12 detects lateral shake (yaw shake).

  Reference numeral 13 denotes a correction lens for image blur correction that constitutes a part of the imaging optical system, and is displaced in a direction perpendicular to the optical axis (within the plane orthogonal to the optical axis) to decenter the optical axis and correct image blur. Reference numeral 100 denotes a shake correction device that displaces the correction lens 13 within the plane orthogonal to the optical axis.

  Reference numerals 14 and 15 denote position sensors, which detect displacement in the direction perpendicular to the optical axis of the correction lens 13. The position sensor 14 detects a displacement corresponding to the yaw direction, and the position sensor 15 detects a displacement corresponding to the pitch direction.

  Reference numerals 16 and 17 denote shake correction circuits, which perform closed-loop control of the position of the correction lens 13 based on outputs from the shake detection sensors 11 and 12 and outputs from the position sensors 14 and 15. When the output from the position sensors 14 and 15 is controlled so as to approach the reference value, the correction lens 13 is stabilized at a position substantially at the center of the optical axis. In this state, for example, a value obtained by giving a predetermined gain to the outputs from the shake detection sensors 11 and 12 is added to the input value as a target value, so that the correction lens 13 is optically aligned with the shake of the lens barrel 10. Displacement in the vertical direction and shake correction control.

  Hereinafter, the lens barrel having the image blur correction apparatus 100 will be described with reference to FIGS. 3 and 4.

  The shift base 1001 (base member) is a fixed part, and is fixed to the lens barrel 10 via a roller (not shown). The shift base 1001 has spring mounting portions 1001a, 1001b, and 1001c to which one ends of the spring members 1008a, 1008b, and 1008c are attached (hooked). Furthermore, magnets 1004p and 1004y, first yokes 1006p and 1006y, first ball seats 1010a, 1010b and 1010c, and damper members 1014p and 1014y are attached to the shift base 1001.

  Note that the component with “p” means that it is a component for correcting image blur caused by rotational shake in the pitch direction of the interchangeable lens 2. In addition, the component with “y” means that it is a component for correcting image blur caused by rotational shake of the interchangeable lens 2 in the yaw direction. The component with “p” and the component with “y” are arranged at positions that are 90 degrees out of phase with each other when viewed in the optical axis direction.

  Reference numeral 1002 denotes a shift barrel as a lens holding member that holds the correction lens 13, and the other ends of the spring members 1008a, 1008b, and 1008c are attached (hooked). Spring mounting portions 1002a1, 1002b1, and 1002c1 are provided. The shift barrel 1002 is held by a shift base 1001 via spring members 1008a, 1008b, and 1008c so as to be movable in a direction orthogonal to the optical axis direction (also the direction in which the optical axis of the correction lens 13 extends).

  In the following description, a direction orthogonal to the optical axis direction is referred to as a shift direction, and shifting in the shift direction is referred to as shifting.

  The shift lens barrel 1002 is provided with coils 1003p and 1003y, position detection magnets 1005p and 1005y, and second ball seats 1011a, 1011b and 1011c.

  Reference numerals 1015p and 1015y are position sensors constituted by Hall elements, which are fixed to a surface (hereinafter referred to as a front surface) on the shift barrel 1002 side (lens holding member side) of the shift base 1001 via a flexible substrate 1013 (not shown). The In the following description, the shift lens barrel side viewed from the shift base is referred to as the front side, and the shift base side viewed from the shift lens barrel is referred to as the rear side. The position sensor 1015p, 1015y detects the change in the magnetic field generated by the shift of the position detection magnets 1005p, 1005y together with the shift lens barrel 1002, thereby calculating the shift amount of the shift lens barrel 1002, that is, the shift position. .

  The first yokes 1006p and 1006y are fixed to the front surface of the shift base 1001 with screws. Magnets 1004p and 1004y are attracted and fixed to the front surfaces of the first yokes 1006p and 1006y by a magnetic force, respectively.

  Reference numeral 1007 denotes a second yoke, which is provided for the purpose of reducing leakage of magnetic flux generated by the magnets 1004p and 1004y. The second yoke 1007 is fixed to the shift base 1001 with screws.

  Accordingly, the coils 1003p and 1003y are arranged between the second yoke 1007 and the first yokes 1006p and 1006y (and the magnets 1004p and 1004y). The magnet 1004p and the coil 1003p constitute an actuator that drives the shift barrel 1002 in the pitch direction, and the magnet 1004y and the coil 1003y constitute an actuator that drives the shift barrel 1002 in the yaw direction.

  The other end of each spring member attached to the shift lens barrel 1002 is positioned in front of one end attached to the shift base 1001. That is, each spring member is disposed so as to be inclined with respect to the optical axis direction and the shift direction. As a result, the shift barrel 1002 includes not only the biasing force toward the neutral position in the shift direction (the position where the optical axis of the correction lens 13 coincides with the optical axis of the imaging optical system), but also the shift base 1001 side in the optical axis direction. The urging force toward is applied.

  The biasing force toward the shift base 1001 is set so that the shift barrel 1002 does not move away from the shift base 1001 in the optical axis direction even when a certain amount of impact is applied to the interchangeable lens 2. Further, the biasing force in the shift direction is such that the shift lens barrel 1002 is not displaced from the neutral position due to the weight of the shift lens barrel 1002 or disturbance applied to the interchangeable lens 2 in a state where no power is supplied to the coils 1003p and 1003y. Is set.

  Reference numerals 1009a, 1009b, and 1009c denote balls that are held between the first ball seats 1010a, 1010b, and 1010c and the second ball seats 1011a, 1011b, and 1011c by the urging force toward the shift base 1001 described above. . Guide of the shift barrel 1002 in the shift direction with respect to the shift base 1001 is performed by rolling the balls 1009a, 1009b, and 1009c.

  The first ball seats 1010 a, 1010 b, and 1010 c are made of a material having higher rigidity than the shift base 1001 and are attached to the shift base 1001. Each first ball seat prevents the shift base 1001 from being scratched or recessed on the contact surface with each ball.

  The second ball seats 1011 a, 1011 b, and 1011 c are made of a material having higher rigidity than the shift barrel 1002 and are attached to the shift barrel 1002. Each second ball seat prevents the contact surface with each ball in the shift barrel 1002 from being scratched or dented.

  Around the second ball seats 1011a, 1011b, and 1011c, walls 1002a2, 1002b2, and 1002c2 deeper than the radius of each ball are provided from the contact portion of each ball to prevent the ball from jumping out.

  The damper members 1014p and 1014y are provided so as to generate viscous resistance during shift driving.

  The position sensors 1015p and 1015y and the coils 1003p and 1003y are electrically connected to a CPU (not shown) on the electric circuit board by a flexible printed board (not shown), and shake correction control is performed by the control described above.

  Next, details of this time will be described with reference to FIGS. 1, 5, and 6.

  FIG. 5 is a diagram seen from the rear side in the optical axis direction view, and the relationship among the shift base 1001, the shift barrel 1002, and the spring members 1008a, 1008b, 1008c will be described.

  In this embodiment, coil springs are used as the spring members 1008a, 1008b, and 1008c. When viewed in the optical axis direction, one end (inner end) of each of the spring members 1008a, 1008b, and 1008c is hooked to spring mounting portions 1001a, 1001b, and 1001c provided at three circumferentially equal intervals in the shift base 1001. Further, the other ends (outer ends) of the spring members 1008a, 1008b, and 1008c are spring mounting portions 1002a1, 1002b1, and 1002c1 that are provided to protrude rearward at three circumferentially equal intervals in the shift barrel 1002. It is caught in

  FIG. 1 shows a cross-sectional view A shown in FIG. 5, and FIG. 6 shows a view seen from the rear side in the optical axis direction view. Next, the relationship among the coil 1003y, the spring member 1008c, and the spring mounting portions 1001c and 1002c will be described with reference to FIGS.

  In FIG. 1, when viewed in the shift direction, the spring mounting portions 1001c and 1002c and the spring member 1008c do not overlap with the coils 1003y and 1003p, but are arranged behind the coils 1003y and 1003p. Further, in the shift direction view, the ball 1009b does not overlap with the coils 1003y and 1003p, but is disposed behind the coils 1003y and 1003p. Further, the same relationship is established in the other spring members 1008a and 1008b, the spring mounting portions 1001a and 1001b and 1002a, and 1002b and the balls 1009a and 1009c.

  In FIG. 6, the spring 1008c and the ball 1009c are arranged in different phases when viewed in the optical axis direction. Furthermore, the spring 1008c and the ball 1009c are arranged in the phase on the side where the angle between the magnets 1004p and 1004y is narrower when viewed in the optical axis direction. The spring members 1008a, 1008b, 1008c and the balls 1009a, 1009b, 1009c are arranged in different phases when viewed in the optical axis direction. Further, the spring members 1008a, 1008b, 1008c and the balls 1009a, 1009b, 1009c are arranged equally.

  By adopting such an arrangement, the spring members 1008a, 1008b, 1008c and the balls 1009a, 1009b, 1009c do not interfere with the coils 1003y, 1003p, and overlap with each other in the shift direction and have different phases in the optical axis direction. Can be placed. This makes it possible to reduce the size in the radial direction and the optical axis direction as compared with the case where the conventional spring member and the ball are arranged in the same phase and shifted in the radial direction and the optical axis direction.

  In addition, the spring members 1008a, 1008b, and 1008c can be attached without interfering with the coils 1003y and 1003p by attaching the attaching direction from the rear side. Further, by providing the shift lens barrel 1002 with the walls 1002a2, 1002b2, and 1002c2, the shift base 1001 can be incorporated in a state where the balls 1009a, 1009b, and 1009c are incorporated in the shift lens barrel 1002 with the rear side facing upward. Accordingly, it is not necessary to change the orientation of the image blur correction device according to the work situation, and the orientation can be assembled from a certain orientation, so that workability is not sacrificed.

10 lens barrel, 11, 12 shake detection sensor, 13 correction lens,
14,15 position sensor, 16,17 shake correction circuit, 1001 shift base,
1002 shift lens barrel, 1003p, 1003y coil,
1004p, 1004y magnet, 1005p, 1005y position detection magnet,
1006p, 1006y first yoke, 1007 second yoke,
1008a, 1008b, 1008c spring member,
1009a, 1009b, 1009c balls,
1015p, 1015y position sensor,
1001a, 1001b, 1001c, shift base spring mounting portion,
1002a1, 1002b1, 1002c1 Shift lens barrel spring mounting portion,
1002a2, 1002b2, 1002c2 Shift barrel wall

Claims (5)

A lens holding member for holding an anti-vibration lens;
A base member that movably supports the lens holding member in a shift direction orthogonal to the optical axis direction;
At least three balls sandwiched between surfaces perpendicular to the optical axis of the lens holding member and the base member;
One end is attached to the base member and the other end is attached to the lens holding member, and is inclined with respect to the optical axis direction and the shift direction. The ball holding and the lens of the lens holding member are centered on the optical axis. A plurality of spring members to be held;
The plurality of actuators that drive the lens holding member in the shift direction with respect to the base member include a coil fixed to the lens holding member and a magnet fixed to the base member.
A spring fixing portion 1 on the lens holding member side for fixing the spring member and a spring fixing portion 2 on the base member side for fixing the spring member extend from the lens holding member side to the base member side in the optical axis direction. An optical image stabilizer having a protruding shape. When projected from the optical axis direction, the spring member, the ball member, and the magnet member are arranged in different phases, and when projected from the direction perpendicular to the optical axis direction, the spring member and the ball member are 2. The optical image stabilizer according to claim 1, wherein the optical image stabilizer is disposed at a position not overlapping with the coil member. There are two actuators for driving the lens holding member in the shift direction with respect to the base member. When projected from the optical axis direction, the spring member and the ball member are arranged on the side where the angle between the magnet members is narrow. The optical image stabilizer according to claim 1, wherein at least one of the optical anti-vibration devices is arranged. There is a wall portion extending from the lens holding member side to the base member side longer than the radius of the ball around a surface perpendicular to the optical axis for holding the ball provided on the lens holding member to the base. The optical image stabilizer according to any one of claims 1 to 3, wherein the optical image stabilizer is provided. The said spring and a ball are each three, The said springs are each arrange | positioned equally, And the said balls are arrange | positioned equally, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. An optical image stabilizer according to the item.