JP4691472B2 - Mobile unit support device - Google Patents

Description

  The present invention relates to a moving unit support device, and more particularly to a moving unit support device capable of adjusting a preload amount when a moving unit is sandwiched between balls.

  Conventionally, by providing a moving unit support device that moves an image blur correction lens or an image sensor on a plane perpendicular to the optical axis in accordance with the amount of camera shake generated during imaging in an imaging device such as a camera, There has been proposed an image blur correction device that suppresses image blur in the camera.

Patent Document 1 discloses an image blur correction device that holds a moving unit having an image blur correction lens or an image sensor via a ball.
JP-A-2005-352113

  However, the apparatus of Patent Document 1 is difficult to adjust to hold the moving unit with a certain amount of preload via the ball.

  Accordingly, an object of the present invention is to provide a moving unit support device capable of accurately adjusting the amount of preload for holding the moving unit via a ball.

  The moving unit support device according to the present invention includes a first fixing portion having first to third spheres and first to third preload probes for applying a preload in a predetermined direction to the first to third spheres, A ball-shaped first to third adjustment member, first to third ball receiving holes through which the first to third adjustment members can pass, and the first fixing portion of the first to third ball receiving holes on the opposite side. A second fixing portion having first to third receiving plates attached to receive the first to third adjusting members, a first to third sphere, and a first fixing portion movable in a plane perpendicular to a predetermined direction. And a moving unit sandwiched between the first and second fixing portions in a state where preload is applied via the first to third adjusting members, and the first to third receiving plates measure the amount of preload. It is removable.

  Preferably, the first to third preload probes are movable in a predetermined direction to adjust the amount of preload, and the first to third ball receiving holes are removed when the first to third receiving plates are removed. A preload amount measurement unit for measuring the amount of preload can contact the first to third adjustment members.

  An image blur correction device as a moving unit support device according to the present invention includes first to third spheres, and first to third preload probes that apply preload to the first to third spheres in the optical axis direction. A first fixing portion, a ball-shaped first to third adjusting member, first to third ball receiving holes through which the first to third adjusting members can pass, and first to third ball receiving holes. A second fixing portion having first to third receiving plates attached to the opposite side of the first fixing portion and receiving the first to third adjusting members, and movable on a plane perpendicular to the optical axis for image blur correction And a moving unit sandwiched between the first and second fixing portions in a state in which preload is applied via the first to third balls and the first to third adjusting members. The third backing plate is removable to measure the amount of preload.

  As described above, according to the present invention, it is possible to provide a moving unit support device capable of accurately adjusting the amount of preload for holding the moving unit via the ball.

  Hereinafter, the present embodiment will be described with reference to the drawings. The camera body 1 will be described as a digital camera. In order to explain the direction, in the camera body 1, the horizontal direction orthogonal to the optical axis O of the photographing lens (not shown) accommodated in the lens barrel 2 is orthogonal to the first direction x and the optical axis O. The vertical direction to be described is a second direction y, and the horizontal direction parallel to the optical axis O is a third direction z.

  The camera body 1 includes a lens barrel 2 and a vibration isolation unit 10 (see FIG. 1).

  The subject image is picked up as an optical image through a photographing lens by an image pickup device IS such as a CCD, subjected to image processing after A / D conversion, and the picked-up image is displayed. An image signal obtained by imaging is recorded by a storage unit such as a memory card.

  The image stabilization unit 10 is caused by camera shake by moving the moving unit 15a including the imaging element IS on a plane perpendicular to the optical axis O (hereinafter referred to as xy plane) corresponding to the amount of camera shake. This is a device that corrects image blur by eliminating the deviation of the optical axis O on the imaging plane of the subject image and keeping the subject image and the imaging plane position constant.

  The anti-vibration unit 10 includes a moving unit 15a and a fixed unit 15b (see FIGS. 2 to 10). The moving unit 15a is sandwiched between fixed units 15b (first and second yokes YA, YB) fixed to the camera body 1 via balls (first to third substrate support portions 32A to 32C). It can move on the xy plane. The moving unit 15a includes a low-pass filter LF, an imaging element IS, an imaging plate substrate 45, first and second horizontal driving coils CXA and CXB, and first and second vertical driving coils CYA and CYB. The fixed unit 15b includes first and second yokes YA and YB, first to fifth support columns 31A to 31E, a substrate support portion 32, first and second horizontal driving magnets MXA and MXB, and first and second. It has vertical driving magnets MYA and MYB.

  The first and second horizontal driving coils CXA and CXB and the first and second vertical driving coils CYA and CYB are mounted on the imaging plate substrate 45.

  The first and second yokes YA and YB are plate-like magnetic metal members and are arranged perpendicular to the third direction z. The first to fifth struts 31A to 31E are attached between the first and second yokes YA and YB in parallel with the third direction z.

  One end of the first to fifth support columns 31A to 31E is attached to the first to fifth attachment portions 33A1 to 33E1 of the first yoke YA, and the other end is the sixth to tenth attachment portions 33A2 to the second yoke YB. It is attached to 33E2. A constant distance is maintained between the first yoke YA and the second yoke YB.

  The 1st-3rd support | pillar 31A-31C passes the 1st-3rd movement unit control part 34A-34C provided in the image pick-up board board | substrate 45. As shown in FIG. When the moving unit 15a is within the moving range of the moving unit 15a for image blur correction, the first to third moving unit restricting portions 34A to 34C are arranged so that the first to third support columns 31A to 31C are the imaging plate substrate 45. It is a space that is set in a size and positional relationship that does not contact (any one of the first to third moving unit restricting portions 34A to 34C). When the moving unit 15a moves beyond the moving range of the moving unit 15a for image blur correction, such as when the camera body 1 is shaken, at least one of the first to third support columns 31A to 31C is an imaging plate. It contacts the substrate 45 (any one of the first to third movement unit restricting portions 34A to 34C), and the movement of the moving unit 15a is restricted.

  When the camera body 1 is turned off, the moving unit 15a by the first vertical driving coil CYA or the like is not moved or fixed to a specific location on the xy plane, and the moving unit 15a moves according to gravity. It is moved on a plane and is held in a state where at least one of the first to third support columns 31 </ b> A to 31 </ b> C is in contact with the imaging plate substrate 45.

  The fourth and fifth support columns 31D and 31E pass through the fourth and fifth moving unit restriction notches 34D and 34E provided on the imaging plate substrate 45. The fourth and fifth moving unit restricting cutouts 34D and 34E are set to have a size and positional relationship that the fourth and fourth support columns 31D and 31E do not come into contact with each other when the moving unit 15a moves on the xy plane.

  The imaging plate substrate 45 is narrow in a slidable state on the xy plane by the first and second yokes YA and YB, the first to third support columns 31A to 31C, and the first to third substrate support portions 32A to 32C. Be held.

  The first to third substrate support portions 32A to 32C constituting the substrate support portion 32 are respectively first to third retainers 32A1 to 32C1, first to third preload probes 32A2 to 32C2, and first to third balls 32A3. 32C3, first to third adjustment members 32A4 to 32C4, and first to third receiving plates 32A5 to 32C5 (see FIGS. 3 to 5). In the present embodiment, a mode in which three pairs of retainers, a preload probe, a sphere, and three pairs of adjusting members and a receiving plate are provided will be described.

  The first to third retainers 32A1 to 32C1 are ball receivers of the first to third balls 32A3 to 32C3, and are attached to the first yoke YA. The first to third preload probes 32A2 to 32C2 apply a preload (load) to the first to third balls 32A3 to 32C3 in the third direction z and from the first yoke YA toward the imaging plate substrate 45. The devices to be added are screwed onto the inner peripheral surfaces of the first to third retainers 32A1 to 32C1, respectively, and can be moved back and forth in the third direction z by being rotated by a jig (not shown). ing. The preload amount (load) applied to the first to third balls 32A3 to 32C3 is adjusted by the movement of the first to third preload probes 32A2 to 32C2 in the third direction z. The first to third balls 32A3 to 32C3 urge the imaging plate substrate 45 in the third direction z by the preload by the first to third preload probes 32A2 to 32C2 in a rotatable state. The imaging board substrate 45 urged in the third direction z (received preload) preloads the first to third adjustment members 32A4 to 32C4.

  The first to third spheres 32A3 to 32C3 are arranged on the first yoke YA so as to constitute the apex of the triangle. The first to third adjustment members 32A4 to 32C4 are arranged so as to constitute the apex of the triangle on the second yoke YB.

  The first to third receiving plates 32A5 to 32C5 and the first to third ball receiving holes 32A6 to 32C6 provided in the second yoke YA can freely rotate the ball-shaped first to third adjusting members 32A4 to 32C4. Plays the role of holding the ball. The first to third ball receiving holes 32A6 to 32C6 pass through holes that are slightly larger than the ball diameters of the first to third adjusting members 32A4 to 32C4.

  In the preload amount (load) measurement using the preload amount measuring unit 50, the first to third receiving plates 32A5 to 32C5 are detached from the second yoke YB, and the first to third adjusting members 32A4 to 32C4 are The first to third ball receiving holes 32A6 to 32C6 protrude in the third direction z and to the opposite side of the imaging plate substrate 45 (see FIG. 11).

  The preload measuring unit 50 is in contact with the first to third adjustment members 32A4 to 32C4 and measures the preload amount (load) of the first to third substrate support units 32A to 32C (push pull gauge). It is.

  In the present embodiment, when the moving unit 15a is pinched via a ball, the third position is determined at a plurality of positions (first to third substrate support portions 32A to 32C) so that the moving unit 15a is not displaced in the third direction z. A preload is applied in the direction z. Since this preload amount has a structure that can be measured using the preload amount measuring unit 50, it is possible to perform preload with higher accuracy than in a configuration in which the preload amount cannot be adjusted, and to suppress variations in vibration control. It becomes possible.

  When the first to third receiving plates 32A5 to 32C5 are attached to the second yoke YB, the first to third adjusting members 32A4 to 32C4 are rotatable, and the first to third receiving plates 32A5 to 32C5 The imaging plate substrate 45 is biased in the third direction z by a reaction force (a reaction force of preload by the first to third preload probes 32A2 to 32C2).

  The portions (first to third spheres 32A3 to 32C3 and first to third adjustment members 32A4 to 32C4) of the substrate support portion 32 that are in contact with the imaging plate substrate 45 may be metal balls, such as silicon nitride. It is desirable to be composed of ceramic balls.

  The first and second horizontal driving magnets MXA and MXB and the first and second vertical driving magnets MYA and MYB are mounted on the first yoke YA (see FIG. 3).

  In the initial state before the moving unit 15a starts moving, the imaging plate substrate 45 has the optical axis O passing through the center of the effective imaging area of the imaging element IS, and the sides constituting the rectangle of the effective imaging area are in the first direction x. Or it is desirable to arrange | position in the positional relationship (movement center position) parallel to the 2nd direction y. The imaging element IS is disposed on the imaging plate substrate 45 and on the side facing the hole 35 of the first yoke YA.

  The first horizontal driving coil CXA is in a positional relationship facing the first horizontal driving magnet MXA in the third direction z. The second horizontal driving coil CXB is in a positional relationship facing the second horizontal driving magnet MXB in the third direction z.

  The first vertical driving coil CYA is in a positional relationship facing the first vertical driving magnet MYA in the third direction z. The second vertical driving coil CYB is in a positional relationship facing the second vertical driving magnet MYB in the third direction z.

  In the first and second horizontal driving magnets MXA and MXB, the N pole and the S pole are arranged in the first direction x.

  In the first and second vertical driving magnets MYA and MYB, the N pole and the S pole are arranged in the second direction y.

  The coil pattern of the first horizontal driving coil CXA is such that the moving unit 15a including the first horizontal driving coil CXA is formed by a current flowing through itself and an electromagnetic force generated from the magnetic field of the first horizontal driving magnet MXA. In order to generate a driving force for moving in the one direction x, a line segment parallel to the second direction y is provided. The coil pattern of the second horizontal driving coil CXB is the movement of the moving unit 15a including the second horizontal driving coil CXB by the current flowing through itself and the electromagnetic force generated from the magnetic field of the second horizontal driving magnet MXB. In order to generate a driving force for moving in the one direction x, a line segment parallel to the second direction y is provided.

  The coil pattern of the first vertical driving coil CYA uses the current flowing therethrough and the electromagnetic force generated from the magnetic field of the first vertical driving magnet MYA to move the moving unit 15a including the first vertical driving coil CYA to the first. In order to generate a driving force that moves in two directions y, a line segment parallel to the first direction x is provided. The coil pattern of the second vertical driving coil CYB is obtained by moving the moving unit 15a including the second vertical driving coil CYB to the first by the current flowing through itself and the electromagnetic force generated from the magnetic field of the second vertical driving magnet MYB. In order to generate a driving force that moves in two directions y, a line segment parallel to the first direction x is provided.

  The first yoke YA is disposed on the side close to the lens barrel 2 side with respect to the second yoke YB. The first yoke YA has a hole 35 in which a portion facing the imaging element IS is hollowed out so as not to block light incident on the effective imaging area of the imaging element IS. The hole 35 has such a size and positional relationship that the imaging element IS, the low-pass filter LF, and the like do not contact the portion of the first yoke YA where the hole 35 is located when the moving unit 15a moves. Specifically, even when the camera body 1 is shaken, at least one of the first to third support columns 31A to 31C moves in contact with the first to third movement unit restricting portions 34A to 34C. The movement of the unit 15a is restricted, and the moving unit 15a has such a size and positional relationship that the moving unit 15a does not come into contact with the portion having the hole 35 of the first yoke YA.

  The first and second yokes YA and YB prevent the magnetic fields of the first and second horizontal driving magnets MXA and MXB and the first and second vertical driving magnets MYA and MYB from leaking to the surroundings. The magnetic flux density between the first horizontal driving coil CXA and the first horizontal driving magnet MXA, the magnetic flux density between the second horizontal driving coil CXB and the second horizontal driving magnet MXB, The magnetic flux density between the first vertical driving coil CYA and the first vertical driving magnet MYA, and the magnetic flux density between the second vertical driving coil CYB and the second vertical driving magnet MYB. Play a role to enhance.

  In the present embodiment, the imaging plate substrate 45 including the imaging element IS is arranged on the moving unit 15a and moves on the xy plane. However, the imaging element IS is fixed, and an image blur correction lens (not shown). The same effect can be obtained in the form in which the movement unit 15a is arranged and moved.

  Further, the moving unit support device (anti-vibration unit 10) having the moving unit 15a and the fixed unit 15b is used as an image blur correction device, but is not limited to this, and is movable in the xy plane. It may be used for other devices having a moving unit 15a held in

It is a perspective view which shows the external appearance of the camera main body in this embodiment. It is the perspective view which looked at the vibration proof unit from the 1st yoke side. It is the perspective view which looked at the vibration isolator unit from the 2nd yoke side. It is a front view of a vibration isolator unit. It is sectional drawing which looked at the vibration proof unit from the 1st direction. It is a rear view of a vibration isolator unit. It is a front view of a movement unit. It is a rear view of a moving unit. It is a front view of the 1st yoke. It is a rear view of the 1st yoke. It is sectional drawing seen from the 1st direction which shows the state which a preload measuring part contacts the 3rd adjustment member of a vibration isolator unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera main body 2 Lens barrel 10 Anti-vibration unit 15a, 15b Moving unit, fixed unit 31A-31E 1st-5th support | pillar 32 Substrate support part 32A-32C 1st-3rd board | substrate support part 32A1-32C1 1st-1st 3 retainers 32A2 to 32C2 1st to 3rd probes 32A3 to 32C3 1st to 3rd spheres 32A4 to 32C4 1st to 3rd adjustment members 32A5 to 32C5 1st to 3rd receiving plates 32A6 to 32C6 1st to 3rd ball receivers Holes 33A1 to 33E1 First to fifth mounting portions 33A2 to 33E2 Sixth to tenth mounting portions 34A to 34C First to third moving unit restricting portions 45 Imaging plate substrate 50 Preload amount measuring portion CXA, CXB First and second Horizontal driving coils CYA, CYB First and second vertical driving coils IS Image sensor LF Low-pass filter MXA MXB first and second horizontal driving magnet MYA, MYB first and second vertical driving magnet O optical axis YA, YB first, second yoke

Claims (3)

A first fixing portion having first to third balls, and first to third preload probes for applying a preload to the first to third balls in a predetermined direction;
A ball-shaped first to third adjusting member, first to third ball receiving holes through which the first to third adjusting members can pass, and the first fixing portion of the first to third ball receiving holes; A second fixing portion having first to third receiving plates attached to the opposite side and receiving the first to third adjusting members;
The first and second fixings in a state where the preload is applied via the first to third balls and the first to third adjusting members while being movable on a plane perpendicular to the predetermined direction. A moving unit sandwiched between the parts,
The moving unit support device according to claim 1, wherein the first to third receiving plates are removable to measure the amount of the preload. The first to third preload probes are movable in the predetermined direction to adjust the amount of the preload;
In the first to third ball receiving holes, when the first to third receiving plates are removed, a preload measuring unit for measuring the preload amount can contact the first to third adjusting members. The moving unit supporting device according to claim 1, wherein the moving unit supporting device is provided. A first fixing portion having first to third spheres and first to third preload probes for applying a preload to the first to third spheres in an optical axis direction;
A ball-shaped first to third adjusting member, first to third ball receiving holes through which the first to third adjusting members can pass, and the first fixing portion of the first to third ball receiving holes; A second fixing portion having first to third receiving plates attached to the opposite side and receiving the first to third adjusting members;
The preload is applied via the first to third spheres and the first to third adjustment members while being movable for image blur correction on a plane perpendicular to the optical axis. A moving unit sandwiched between the first and second fixing parts,
The image blur correction device for correcting blur of an optical image formed through an imaging optical system, wherein the first to third receiving plates are removable for measuring the amount of the preload.

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