JP5641883B2 - Vibration correction device - Google Patents

Description

  The present invention relates to a shake correction apparatus that corrects image shake of an imaging apparatus such as a digital camera.

  In the shake correction apparatus, a structure in which a correction lens that deflects photographing light by displacing in a direction orthogonal to the optical axis is held by a tension coil spring is known. However, this structure has a problem in that the response of the correction lens is delayed due to frictional sliding between the hook portion of the tension coil spring and the spring hook portion on which the hook portion is hooked. In view of this, a technique has been proposed in which the movement of the hook portion of the tension coil spring with respect to the spring hook portion is restricted to prevent a reduction in shake correction performance due to a delay in the response of the correction lens (Patent Document 1).

Japanese Patent No. 3754810

  However, in Patent Document 1, since the movement of the correction lens in the optical axis direction is regulated by fitting the arm portion provided on the holding member of the correction lens into the elongated hole provided in the base member, the component tolerance is reduced. It is necessary to manage strictly.

  Then, an object of this invention is to provide the mechanism which can regulate the motion of the hook part of an elastic member, relaxing management of part tolerance.

In order to achieve the above object, the shake correction device of the present invention includes a base member on which a first locking portion is formed, a holding member on which a second locking portion is formed, and holds a lens. , A first hook portion locked to the first locking portion, a second hook portion locked to the second locking portion, the first hook portion and the second hook portion A spring member having a coil portion formed between the first hook portion and the coil portion formed between the first hook portion and the coil portion. By engaging the first restricting member for restricting the movement of the hook portion and the second portion formed between the second hook portion and the coil portion of the spring member, the second portion A second restricting member for restricting the movement of the hook portion, and the holding member has a light beam of the lens with respect to the base member. The movement direction of the first hook part restricted by the first restricting member and the second hook part restricted by the second restricting member are arranged so as to be displaceable in a direction orthogonal to the first restricting member. and movement direction is such that the opposite directions to each other, together with the first regulating member is provided on said base member, said second regulating member and characterized that you have provided in the holding member To do.

According to the present invention, it is possible to prevent the shake correction performance from deteriorating by regulating the movement of the first hook portion and the second hook portion of the spring member while relaxing the management of component tolerances.

It is the figure which looked at the shake correction apparatus which is the 1st Embodiment of this invention from the optical axis direction. It is the sectional view on the AA line of FIG. It is a figure which shows a tension | pulling coil spring. (A) is the BB sectional view taken on the line of FIG. 1, (b) is the CC sectional view taken on the line of FIG. It is the figure which looked at the shake correction apparatus which is the 2nd Embodiment of this invention from the optical axis direction. It is the DD sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a view of a shake correction apparatus according to a first embodiment of the present invention viewed from the optical axis direction, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIGS. 1 and 2, in the shake correction apparatus of the present embodiment, the holding frame 2 that holds the correction lens 3 is disposed on the front side (subject side) of the base plate 1 that holds the lens 11 in the optical axis direction. . The holding frame 2 has a smaller diameter than the main plate 1, and a plurality of rolling elements 12 are arranged at predetermined intervals in the circumferential direction between the holding frame 2 and the main plate 1. Thereby, the correction lens 3 can be displaced along a plane perpendicular to the optical axis direction with respect to the base plate 1. Here, the holding frame 2 corresponds to an example of the holding member of the present invention, and the ground plane 1 corresponds to an example of the foundation member of the present invention.

  A plurality (two in FIG. 1) of magnets 10 are fixed to the holding frame 2 by adhesion or the like while being separated from each other in the circumferential direction. Further, the holding frame 2 is provided with a plurality (three in FIG. 1) of movable side spring hooks 4 protruding in the opposite direction to the main plate 1 at substantially equal intervals in the circumferential direction. On the radially outer side of the movable side spring hooking portion 4 of the holding frame 2, movable side position restricting members 6 that protrude in the direction opposite to the main plate 1 are provided corresponding to the number of the movable side spring hooking portions 4.

  The ground plate 1 is provided with a plurality of fixed-side position restricting members 7 projecting toward the holding frame 2 at substantially equal intervals in the circumferential direction corresponding to the movable-side position restricting member 6. The fixed side position restricting member 7 can be attached to and detached from the main plate 1 (see FIG. 4B). On the outer side in the radial direction of the fixed side position restricting member 7 of the base plate 1, fixed side spring hooks 5 protruding toward the holding frame 2 are provided corresponding to the number of the fixed side position restricting members 7.

  Then, hook portions 31 at both ends of the tension coil spring 8 are hung on the fixed side spring hanging portion 5 of the base plate 1 and the movable side spring hanging portion 4 of the holding frame 2, respectively. Thereby, the holding frame 2 is elastically supported so as to be displaceable with respect to the main plate 1. In this state, the hook part 31 hung on the fixed side spring hook part 5 of the base plate 1 and the hook part 31 hung on the movable side spring hook part 4 of the holding frame 2 are different in the position in the optical axis direction. Be placed.

  A plurality of coils 9 are fixed to the base plate 1 so as to overlap the magnet 10 in the optical axis direction. A magnetic field generated by energizing the coil 9 affects the magnetic field formed by the magnet 10, and the holding frame 2 holding the correction lens 3 is displaced along a plane perpendicular to the optical axis direction with respect to the ground plane 1. Generate the force to make. Then, based on detection information from a shake detection unit (not shown) (for example, a gyro sensor), the holding frame 2 that holds the correction lens 3 is displaced along the plane perpendicular to the optical axis direction with respect to the base plate 1, thereby taking the photographing light. Is used to correct image blur.

  Next, the shape of the tension coil spring 8 (elastic member) will be described with reference to FIG. As shown in FIG. 3, a coil portion 8a, which is a spring effective portion, is disposed at the center of the tension coil spring 8, and hook portions 31 are disposed at both ends of the coil portion 8a. A straight line portion 32 is arranged between the portion 31. Here, the straight line portion 32 corresponds to an example of the relay portion of the present invention. In the present embodiment, the coil spring 8 having the coil portion 8a is exemplified as the elastic member. However, if the same effect is obtained, the spring portion of another shape or rubber is used instead of the coil portion. It may be an elastic member.

  4A is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 4B is a cross-sectional view taken along the line CC in FIG. As shown in FIG. 4A, a movable side groove 43 is formed in the movable side position regulating member 6, and one linear portion 32 of the tension coil spring 8 is fitted in the movable side groove 43. Thereby, the linear part 32 is clamped by the movable side groove | channel 43, and the motion of the hook part 31 with respect to the movable side spring hook part 4 is controlled.

  Further, as shown in FIG. 4B, the fixed side position restricting member 7 has a fixed side groove 42 formed in the fixed side position restricting member 7, and the fixed side groove 42 includes the tension coil spring 8. The other straight part 32 is inserted. Thereby, the linear part 32 is clamped by the fixed side groove | channel 42, and the movement of the hook part 31 with respect to the fixed side spring hook part 5 is controlled.

  Here, the movable side groove 43 and the fixed side groove 42 are opened in different directions in the optical axis direction. Thereby, a part of the urging force of the tension coil spring 8 can be applied in the direction in which the holding frame 2 is pressed against the base plate 1 in the optical axis direction. As a result, the state in which the holding frame 2 is pressed against the base plate 1 in the optical axis direction can be maintained, and the movement of the correction lens 3 in the optical axis direction can be restricted.

  Next, a method for attaching the tension coil spring 8 will be described. First, the hook portions 31 at both ends of the tension coil spring 8 are hung on the movable side spring hook portion 4 and the fixed side spring hook portion 5, respectively, and the linear portion 32 is inserted into the movable side groove 43 of the movable side position restricting member 6.

  Thereafter, the straight portion 32 is fitted into the fixed side groove 42 of the fixed side position restricting member 7, and the fixed side position restricting member 7 is attached to the main plate 1 in this state. In this attached state, as shown in FIG. 4B, the locking portion 41 of the fixed side position restricting member 7 is locked to the base plate 1, and the fixed side position restricting member 7 is fixed to the base plate 1.

  As described above, in this embodiment, the movement of the correction lens 3 in the optical axis direction is restricted using the biasing force of the tension coil spring 8. For this reason, unlike the prior art, it is not necessary to fit the arm portion provided on the holding member of the correction lens into the long hole provided in the base member, and the management of component tolerance can be eased.

  In the present embodiment, the linear portion 32 of the tension coil spring 8 is pressed into the movable side groove 43 of the movable side position restricting member 6 and the fixed side groove 42 of the fixed side position restricting member 7 to restrict the movement of the hook portion 31. By doing so, it is possible to prevent a reduction in shake correction performance.

(Second Embodiment)
Next, with reference to FIGS. 5 to 8, a shake correction apparatus according to a second embodiment of the present invention will be described. 5 is a view of a shake correction apparatus according to a second embodiment of the present invention viewed from the optical axis direction, FIG. 6 is a cross-sectional view taken along line DD of FIG. 5, and FIG. 7 is a cross-sectional view taken along line FF of FIG. FIG. 8 is a cross-sectional view taken along line EE in FIG. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to each figure and the description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, in the shake correction apparatus of the present embodiment, a light shielding plate 51 is disposed on the subject side of the holding frame 2 in the optical axis direction. The light shielding plate 51 is detachably fixed to the base plate 1 with screws 53. As shown in FIGS. 6 and 7, the light shielding plate 51 is provided with a fixed-side groove 42. The fixed-side groove 42 has a linear portion of the tension coil spring 8 as in the first embodiment. 32 is inserted. Here, the light shielding plate 51 corresponds to an example of the light shielding member of the present invention.

  As shown in FIG. 8, the screw shaft 81 of the screw 53 passes through the screw insertion hole 52 formed in the light shielding plate 51 and is fastened and fixed to the screw hole 1 a of the ground plate 1. A predetermined gap is provided between the screw shaft 81 and the screw insertion hole 52. Accordingly, when the screw 53 is loosened, the light shielding plate 51 is placed on a surface perpendicular to the optical axis direction with respect to the ground plane 1. It becomes possible to move along.

  Here, since the linear portion 32 of the tension coil spring 8 is fitted in the fixed side groove 42 of the light shielding plate 51, when the light shielding plate 51 moves, the tension coil spring 8 also moves integrally. Thereby, the balance state of the force of the plurality of tension coil springs 8 can be changed, and as a result, the initial position of the correction lens 3 can be adjusted. Other configurations and operational effects are the same as those of the first embodiment.

  The configuration of the present invention is not limited to those exemplified in the above embodiments, and the material, shape, dimensions, form, number, arrangement location, and the like are appropriately changed without departing from the gist of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Ground plane 2 Holding frame 3 Correction lens 4 Movable side spring hook part 5 Fixed side spring hook part 6 Movable side position control member 7 Fixed side position control member 8 Pulling coil spring 31 Hook part 51 Light-shielding plate

Claims (4)

A base member on which a first locking portion is formed;
A second locking portion is formed, and a holding member for holding the lens;
A first hook portion locked to the first locking portion, a second hook portion locked to the second locking portion, a first hook portion and a second hook portion; A spring member having a coil portion formed therebetween;
A first restricting member for restricting movement of the first hook part by engaging with a first part formed between the first hook part and the coil part of the spring member;
A second restricting member for restricting movement of the second hook part by engaging with a second part formed between the second hook part and the coil part of the spring member; With
The holding member is arranged to be displaceable in a direction perpendicular to the optical axis of the lens with respect to the base member,
The movement direction of the first hook part restricted by the first restriction member and the movement direction of the second hook part restricted by the second restriction member are opposite to each other. , together with the first regulating member is provided on said base member, shake the second regulating member is characterized that you have provided in the holding member correcting device. Each of the first portion and the second portion is a straight portion of the spring member,
The first restricting member and the second restricting member each have a groove portion into which the linear portion is inserted,
The groove and the first restricting groove and the second regulating member member, shake correction apparatus according to claim 1, characterized that you have opened in different directions in the optical axis direction. A light shielding member fixed to the foundation member,
In the optical axis direction, the light shielding member is fixed to the foundation member so that the holding member is located between the light shielding member and the foundation member,
The shake correction apparatus according to claim 1, wherein the first restricting member is provided integrally with the light shielding member. The position of the first hook portion locked to the first locking portion and the position of the second hook portion locked to the second locking portion are in the optical axis direction. Different from each other
It shakes correcting device according to any one of claims 1 to 3, wherein Rukoto and a rolling member disposed between said base member and said retaining member.

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