KR20100054707A - Image stabilization apparatus - Google Patents

Abstract

PURPOSE: An image stabilization apparatus which realizes the miniaturization of the apparatus is provided to increase the compensation ability by reducing the driven amount of a maintenance unit. CONSTITUTION: A first moving unit(130) moves a maintenance unit(120) from a first direction. A second moving unit(140) moves the maintenance unit from a second direction. A first driving unit(151) drives the first moving unit. A second driving unit(161) drives the second moving unit. A load control units(180,190) are respectively installed in the first driving unit and the second driving unit. The load control units give the load to each driving unit by a dynamic stability of the elastic material. The dynamic stability is displaced according to the movement of each moving unit.

Description

Image stabilization apparatus {Image stabilization apparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image shake correction apparatus, and more particularly, to an image shake correction apparatus of a lens shift method.

The image shake correction device is a device for preventing shaking from occurring in an image such as an image photographed by an imaging device such as a camera or a video camera. In recent years, when the image is enlarged and displayed on a display device such as a display according to the high pixel size of an image pickup device, for example, a CCD (Charge Coupled Device), a small shake is also noticeable. It is.

The image stabilization apparatus is largely divided into two types, a lens shift method and a CCD shift method. The image shift compensation device of the lens shift method corrects the image shake by driving some lenses in the mirror in accordance with the hand shake. The above-mentioned method can be configured even with a weak force actuator because the lens to be driven is light, but the lens design becomes difficult. On the other hand, the image shift correction device of the CCD shift method corrects the image shake by driving the CCD according to the hand shake. The above system can be constituted only by the imaging device, regardless of the lens configuration, but a strong actuator is required because the weight of the CCD to be driven is heavy. Therefore, there has been a problem that miniaturization of the imaging device is difficult and power consumption of the actuator is large.

In order to solve the above-mentioned problem in the image shift correction device of the lens shift method, Patent Literature 1 describes a moving part that is movable in the correction direction while holding the lens for image shake correction in two directions substantially perpendicular to the optical axis of the lens. Disclosed is an image shake correction device that integrally installs a magnet that is a part of a driving unit for moving and generates an electromagnetic driving force on the magnet by a coil provided on a pedestal supporting the moving unit to correct the position of the lens. The image correction device can be implemented in a simple structure.

On the other hand, Patent Document 2 discloses an image shake correction device for elastically pressing the holding portion toward the pedestal while the holding portion of the moving portion and the lens for moving the holding portion are integrally formed and a ball member is interposed between the holding portion and the pedestal. It is. In the image shake correction device, the ball member is provided so as to roll within the correction range for correcting the lens, thereby reducing the sliding resistance which adversely affects the correction driving force.

On the other hand, patent document 3 discloses the image shake correction apparatus which forms a holding part which hold | maintains a lens and the moving part which moves a holding part separately. The image shake correction device can easily move the lens in each moving direction by forming the holding part and the moving part separately.

[Patent Document 1] US Patent No. 5835799

[Patent Document 2] US Patent No. 6054827

[Patent Document 3] Japanese Patent Application Laid-Open No. 04-180040

However, since the image shake correction apparatus of Patent Documents 1 and 2 is composed of a holding part for holding the lens and a moving part for moving the holding part, all moving parts are driven even when the holding part is moved in only one direction. do. That is, there existed a problem that the weight of the moving part which does not need to move is included in the driven weight, and the correction drive performance tends to fall. In addition, there is also a problem that the apparatus is enlarged because it is necessary to secure the moving range of the moving part which does not need to move.

Moreover, in the image shake correction apparatus of the said patent document 2, when a moving part moves with respect to a base, a moving part is not guide-controlled surely in two directions. Therefore, even when the holding part is moved only in one direction, crosstalk in which the holding part is slightly moved in the other direction occurs, which tends to be a problem in correction performance.

Moreover, in the image shake correction apparatus of the said patent document 3, backlash generate | occur | produced in the correction direction and the optical axis direction of a lens between the holding | maintenance part and the moving part of a lens, and became a problem in correction performance. In addition, there has been a problem that the device is enlarged because the moving part is provided in the outer frame of the holding part for holding the lens.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a novel and improved image stabilization apparatus capable of miniaturizing an apparatus without degrading the correction performance.

According to an aspect of the present invention for solving the above problems, the holding portion for holding the lens, the moving portion is provided independent of the holding portion to move the holding portion on a plane substantially perpendicular to the optical axis of the lens, and the moving portion An image shake correction device is provided that includes a driving unit for driving, a support for holding the holding unit, a pressurizing member for applying a force to the moving unit to press the holding unit toward the pedestal, and a load adjusting mechanism for applying a load to the driving unit. A moving part consists of a 1st moving part which moves a holding part in a 1st direction, and a 2nd moving part which moves a holding part in the 2nd direction orthogonal to a 1st direction, and a drive part is the 1st which drives a 1st moving part. It consists of a drive part and the 2nd drive part which drives a 2nd moving part. And the load adjustment mechanism is provided in each drive part by the restoring force of the elastic member respectively provided in a 1st drive part and a 2nd drive part, and displaced with the movement of each moving part.

According to the present invention, the holding portion holding the lens is moved by the first moving portion and the second moving portion provided independently of the holding portion. When moving the holding part in the first direction, only the first moving part acts on the holding part by driving the first driving part. On the other hand, when moving the holding part in the second direction, only the second moving part acts on the holding part by driving the second driving part. By separating the holding portion and the two moving portions in this way, the driven amount when moving the holding portion can be reduced, and the correction performance can be improved. In addition, since the two moving parts move only in one direction, respectively, the moving range of each moving part can be narrowed, and the device can be miniaturized. In addition, it is possible to prevent the holding portion from rotating by pressing the holding portion toward the pedestal by the pressing member.

And the image shake correction apparatus of this invention is equipped with the load adjustment mechanism which applies a load resistance to the 1st drive part and 2nd drive part which drive a 1st moving part and a 2nd moving part. Thereby, the influence of the load fluctuation which a 1st moving part and a 2nd moving part receive at the time of a movement can be reduced, and the control precision of an image shake correction apparatus can be improved.

Here, a leaf spring can be used as an elastic member of the load adjustment mechanism. At this time, one end of the leaf spring is fixed to the pedestal and the other end of the leaf spring is installed to be movable in accordance with the movement of the moving part.

In addition, the leaf spring is provided so that the restoring force at the initial position where the lens is located at the midpoint position is zero, so that the restoring force generated in the leaf spring displaced according to the movement of the moving part of the driving unit can be provided as a load. In this way, by configuring the load adjusting mechanism such that the leaf spring is in a neutral state with zero restoring force when the lens is in the mid-point position, power consumption due to image stabilization can be reduced.

In addition, the leaf spring may apply a load to the driving unit so that the moving unit can move when the driving unit drives the moving unit with the maximum driving force.

In addition, the first driving unit and the second driving unit are provided on the side opposite to the pedestal of the first moving unit and the second moving unit, respectively, to generate a magnetic field substantially parallel to the optical axis of the lens, and the magnet of the pedestal; It can be configured to consist of coils installed oppositely. At this time, the leaf spring of the load adjustment mechanism has magnetism, and the other end of the leaf spring is always adsorbed to the magnet.

In addition, the leaf spring may be provided with a projection protruding toward the magnet at the other end of the leaf spring. At this time, the protrusion and the magnet are in contact. In addition, the protrusion may be formed in a substantially hemispherical shape. Alternatively, the projection may be formed by providing a ball member at the other end of the leaf spring.

As described above, according to the present invention, it is possible to provide an image shake correction device capable of miniaturizing the device without degrading the correction performance.

EMBODIMENT OF THE INVENTION Preferred embodiment of this invention is described in detail, referring drawings attached below. In the present specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals to omit duplicate explanation.

First, the structure of the image shake correction apparatus which concerns on embodiment of this invention is demonstrated based on FIG. 1 is a plan view showing the configuration of the image shake correction apparatus according to the present embodiment. Fig. 2 is a perspective view showing the configuration of the image shake correction device according to the present embodiment. FIG. 3 is a plan view showing the configuration of the image shake correction apparatus according to the present embodiment, and shows a state in which the second moving part 140 and the second magnet 161 are removed from the state of FIG. 1. FIG. 4 is a plan view showing the configuration of the image shake correction device according to the present embodiment, wherein the first moving part 130, the second moving part 140, the first magnet 151, and the first moving part are shown in the state of FIG. 1. The state except 2 magnets 161 is shown. FIG. 5 is a partial rear view showing the configuration of the first moving unit 130 and the second moving unit 140 according to the present embodiment. FIG. 6 is a plan view showing the configuration of the image shake correction apparatus according to the present embodiment, and shows a state in which a cover plate is provided in the state of FIG. 1. FIG. 7 is a perspective view showing the configuration of the image shake correction device shown in FIG. 6. FIG.

<Configuration of the image stabilizer>

The image shake correction device according to the present embodiment is a lens shift method image shake correction device provided in a shutter portion of an imaging device such as a camera or a video camera. As shown in FIGS. 1 to 3, the image shake correction apparatus 100 according to the present embodiment is supported by the pedestal 110 to hold the lens L, and the holding part 120. First moving unit 130 for moving the first direction, the second moving unit 140 for moving the holding unit 120 in the second direction, and the first driving unit for driving the first moving unit 130. And a second driving unit for driving the second moving unit 140.

The holding part 120 is a member holding the lens L. As shown in FIG. 1, the holder 120 accommodates the lens L therein, and has a substantially cylindrical lens holder 120a extending in the optical axis direction of the lens L, and the lens holder is a pedestal 110. It consists of a support plate supporting above. The support plate is a plate-shaped member perpendicular to the optical axis of the lens L, which is composed of three parts shown by reference numerals 120b, 120c, and 120d in FIG. The holding part 120 is supported so that the support plate may be supported on the pedestal 110 by three ball members at three points, and can move on a plane perpendicular to the optical axis of the lens L. The holding part 120 is moved in a second direction perpendicular to the first direction and the first direction according to the movement of the first moving part 130 and the second moving part 140 which will be described later. Details of the operation will be described later.

In addition, as shown in FIG. 4, the magnet 128 for detecting the movement amounts of the first and second moving parts 130 and 140 is located on the surface of the holding part 120 facing the pedestal 110. 129 is installed. Hall elements 195 and 196 are provided at positions facing the magnets 128 and 129 of the pedestal 110. The movement amount of the holding part 120 can be grasped by detecting the movement amounts of the first moving part 130 and the second moving part 140 by the hall elements 195 and 196. The control unit (not shown) of the image shake correction apparatus 100 calculates a control amount for correcting the image shake using the movement amount of the holding unit 120 detected by the hall elements 195 and 196. By flowing a current through the first coil 152 and the second coil 162 according to the control amount, the first moving part 130 and the second moving part 140 are moved and finally the holding part of the lens L. Move 120.

The first moving part 130 is a member for moving the holding part 120 in the first direction, for example, the X direction. The first moving part 130 is installed on a surface perpendicular to the optical axis of the lens L and is supported by the ball member at two points on the holding part 120 and one point on the pedestal 110. The first moving part 130 is movable along with the holding part 120 in the X direction, and is movable relative to the holding part 120 in the Y direction perpendicular to the X direction, that is, the first moving part 130. ) Can be moved alone.

Three guide parts 134, 135, 136 for guiding the ball member are provided on the side facing the pedestal 110 of the first moving part 130 as shown in FIG. The guide parts 134 and 135 may be formed as, for example, substantially V-shaped grooves extending in the Y direction, and the ball member for supporting the first moving part 130 on the holding part 120 is accommodated. The guide part 136 may be formed as a substantially V-shaped groove extending in the X direction, for example, and a ball member for supporting the first moving part 130 on the pedestal 110 is accommodated. In addition, the positions facing the guides 134, 135 and 136 on the holding part 120 and the pedestal 110 are substantially the same as the guide parts 134, 135 and 136 as shown in FIG. Guides 124, 125, and 111 in the shape are formed.

In addition, as illustrated in FIG. 1, a through hole 133 is formed in the center of the first moving part 130. On the side facing the pedestal 110 of the first moving part 130, as shown in FIG. 5, a substantially rectangular first magnet 151 is provided so as to cover the through hole 133. As shown in FIG. On the two side surfaces of the first magnet 151 facing the second magnet 161 described later, a substantially L-shaped first shielding member 132 covering the side surface is provided. The shielding member 132 is provided in order to reduce the attraction force which the 1st magnet 151 and the 2nd magnet 161 mentioned later pull together. As a result, it is possible to prevent the attraction of the first magnet 151 and the second magnet 161 from affecting the driving force generated by the driving unit.

2, 6 and 7, the first guide pin 130a inserted into the first guide hole 171 formed in the cover plate 170 is formed on the surface of the first moving part 130. Is installed. The first guide pin 130a together with the first guide hole 171 constitutes a drive shaft guide. The first guide pin 130a guides the first moving part 130 to move in the first direction when the first moving part 130 is driven by the first driving part.

The second moving part 140 is a member for moving the holding part 120 in a second direction perpendicular to the first direction, for example, in the Y direction. As shown in FIG. 1, the second moving unit 140 is installed on a surface perpendicular to the optical axis of the lens L, similarly to the first moving unit 130, so that two points on the holding unit 120 are provided. And at one point on the pedestal 110 is supported by a ball member. The second moving part 140 is movable with the holding part 120 in the Y direction, and is movable with respect to the holding part 120 in the X direction perpendicular to the Y direction, that is, the second moving part 140. ) Can be moved alone. Moreover, the 2nd moving part 140 which concerns on this embodiment is arrange | positioned substantially symmetrically with the 1st moving part 130 with respect to the straight line which connects the center of the lens L and the center of the balance member 115 mentioned later.

On the side facing the pedestal 110 of the second moving part 140, three guide parts 144, 145 and 146 for guiding the ball member are provided as shown in FIG. The guide parts 144 and 145 may be formed as, for example, substantially V-shaped grooves extending in the X direction, and the ball member for supporting the second moving part 140 on the holding part 120 is accommodated. The guide portion 146 may be formed as, for example, an approximately V-shaped groove extending in the Y direction and accommodates the ball member for supporting the second moving portion 140 on the pedestal 110. Furthermore, on the holding portion 120 and the pedestal 110, the positions opposite to the guide portions 144, 145, 146 are the same as the guide portions 144, 145, 146 as shown in FIG. 4. Guide portions 126, 127, 112 are formed.

In addition, a through hole 143 is formed in the center of the second moving part 140. As shown in FIG. 5, a substantially rectangular second magnet 161 is provided on the side facing the pedestal 110 of the second moving part 140 to cover the through hole 143. On the two side surfaces of the second magnet 161 that face the first magnet 151, a substantially L-shaped second shielding member 142 covering the side surface is provided. Like the first shielding member 132, the shielding member 142 is installed to reduce the attraction force between the first magnet 151 and the second magnet 161. In addition, in this embodiment, the 1st moving part 130 and the 2nd moving part 140 are arrange | positioned at the same plane perpendicular | vertical with respect to the optical axis of the lens L. As shown in FIG.

In addition, as shown in FIGS. 2, 6, and 7, the surface of the second moving part 140 is inserted into the second guide hole 172 and the third guide hole 173 formed in the cover plate 170. The second guide pin 140a and the third guide pin 140b are installed. The second guide pin 140a and the third guide pin 140b together with the second guide hole 172 and the third guide hole 173 constitute a drive shaft guide. The second guide pin 140a and the third guide pin 140b guide the second moving part 140 to move in the second direction when the second moving part 140 is driven by the second driving part.

The first driving unit is a driving unit for driving the first moving unit 130 in the X direction, which is the first direction, and includes a first magnet 151 (see FIG. 5) installed in the first moving unit 130, and FIG. 4. It consists of the 1st coil 152 shown. As the first driver, for example, a voice coil motor (hereinafter, referred to as "VCM") can be used. The first driving unit 130 uses the driving force in the X direction generated by the law of the left hand of Fleming when a current flows in the first coil 152 of the magnetic field generated by the first magnet 151. ) In the X direction. The first coil 152 is formed by winding the conducting wire around the optical axis direction of the lens L, and is installed on the pedestal 110 corresponding to the movable range of the first moving part 130.

The first magnet 151 constituting the first driving unit is provided with a first load adjusting mechanism 180 that applies a load resistance to the first driving unit when the first driving unit is driven. As shown in FIG. 4, the first load adjustment mechanism 180 includes a leaf spring 181, a ball member 182, and a fixing member 184, and is provided at one end of the leaf spring 181. The ball member 182 is provided and the other end of the leaf spring 181 is fixed to the pedestal 110 by the fixing member 184. The detail of the 1st load adjustment mechanism 180 is mentioned later.

As shown in FIG. 4, a magnetic first yoke 153 is provided between the first coil 152 and the pedestal 110. A magnetic attraction force acts between the first magnet 151 and the first yoke 153. As a result, the first moving part 130 provided with the first magnet 151 is pulled toward the pedestal 110.

The second driving unit is a driving unit for driving the second moving unit 140 in the Y direction, which is the second direction, and includes a second magnet 161 (see FIG. 5) provided in the second moving unit 140, and FIG. 4. It consists of the 2nd coil 162 shown. The second driver may also use VCM, for example. Like the first driving unit, the second driving unit uses the driving force in the Y direction generated when a current flows in the second coil 162 in the magnetic field generated by the second magnet 161 to operate the second moving unit 140. Move in the Y direction. The second coil 162 is formed by turning the conducting wire around the optical axis direction of the lens L and is installed on the pedestal 110 corresponding to the movable range of the second moving unit 140.

The second magnet 161 constituting the second driving unit is provided with a second load adjusting mechanism 190 that applies a load resistance to the second driving unit when the second driving unit is driven. As shown in FIG. 4, the second load adjusting mechanism 190 includes a leaf spring portion 191, a ball member 192, and a fixing member 194, and a ball at one end of the leaf spring portion 191. The member 192 is installed and the other end of the leaf spring 191 is fixed to the pedestal 110 by the fixing member 194. Details of the second load adjustment mechanism 190 will be described later together with the first load adjustment mechanism 180.

As shown in FIG. 4, a magnetic second yoke 163 is provided between the second coil 162 and the pedestal 110. Since a magnetic attraction acts between the second magnet 161 and the second yoke 163, the second moving part 140 provided with the second magnet 161 is pulled toward the pedestal 110.

The first moving unit 130 and the second moving unit 140 do not have a center at the same position as the center of the lens L. Therefore, when the first moving unit 130 and the second moving unit 140 are moved, a rotation moment may occur, and the holding unit 120 may rotate. Thus, as shown in FIG. 1, a balance member 115 is formed between the first moving unit 130 and the second moving unit 140 of the pedestal 110 to balance the movement by the weight of the balancing member 115. It may be configured to hold.

In the above, the structure of the image shake correction apparatus 100 which concerns on this embodiment was demonstrated. The image shake correction apparatus 100 corrects the image shake by moving the holding unit 120 holding the lens L by the first moving unit 130 and the second moving unit 140 independent of each other. The operation of the image shake correction apparatus 100 according to the present embodiment will be described below.

<Operation of the image stabilizer>

As described above, the image shake correction apparatus 100 according to the present embodiment moves the first moving unit 130 in the X direction by the first driving unit, and moves the second moving unit in the Y direction by the second driving unit. The lens L is moved by doing so. At this time, the holding part 120 holding the lens L is supported by the three ball members 121, 122, 123 on the pedestal 110, as shown in Figure 4, the lens (L) It can move the XY plane perpendicular to the optical axis of.

In addition, as described above, the first moving part 130 includes a ball member accommodated in the guide parts 134 and 135 of the first moving part 130 and the guide parts 124 and 125 of the holding part 120. 137 and 138 are supported on the holding portion 120, and the pedestal by the ball member 139 accommodated in the guide portion 136 of the first moving portion 130 and the guide portion 111 of the pedestal 110 It is supported above 110. In addition, the second moving parts 140 are ball members 147 and 148 accommodated in the guide parts 144 and 145 of the second moving parts 140 and the guide parts 126 and 127 of the holding part 120. Is supported on the holding part 120 by the ball member 149 accommodated in the guide part 146 of the second moving part 140 and the guide part 112 of the pedestal 110. It is.

The holding part 120 is moved in the X direction together with the movement of the first moving part 130 by the driving force of the first driving part. That is, when the first driving unit generates the driving force in the X direction, the first moving unit 130 including the first magnet 151 is moved in the X direction. At this time, the ball members 137 and 138 accommodated in the guide parts 134 and 135 of the first moving part 130 and the guide parts 124 and 125 of the holding part 120 are approximately shown in FIG. 5. The movement in the X direction is restricted by the V-shaped groove. On the contrary, the ball member 139 accommodated in the guide portion 136 of the first moving portion 130 and the guide portion 111 of the pedestal 110 is not restricted in the X direction, and is substantially extended in the X direction. Guided along the V-groove. Therefore, the holding | maintenance part 120 which can move on an XY plane is integrated with the 1st moving part 130 by the two ball members 137 and 138 on the holding part 120, and is driven by the driving force of a 1st drive part. Thereby moving in the X direction along the guide portion 136.

At this time, in the second moving part 140, the movement of the ball member 149 accommodated in the guide part 146 of the second moving part 140 and the guide part 112 of the pedestal 110 is restricted in the X direction. Therefore, it does not move in the X direction. On the other hand, the guide parts 144 and 145 of the second moving part 140 and the guide parts 126 and 127 of the holding part 120 are formed as substantially V-shaped grooves extending in the X direction. Therefore, when the holding part 120 moves in the X direction, the second moving part 140 is fixed to the pedestal 110 and does not move, and the holding part 120 is the guide part 126 of the second moving part 140. It moves along the 127 in the X direction.

In addition, the holding part 120 is moved in the Y direction along with the movement of the second moving part 140 by the driving force of the second driving part. That is, when the second driving unit generates the driving force in the Y direction, the second moving unit 140 including the second magnet 161 is moved in the Y direction. At this time, the ball members 147 and 148 accommodated in the guide parts 144 and 145 of the second moving part 140 and the guide parts 126 and 127 of the holding part 120 are approximately V shown in FIG. 5. The movement in the Y direction is restricted by the male groove. On the contrary, the ball member 149 accommodated in the guide portion 146 of the second moving portion 140 and the guide portion 112 of the pedestal 110 is not restricted in the Y direction, and is substantially extended in the Y direction. Guided along the V-shaped groove. Therefore, the holding part 120 which can move on the XY plane is integrated with the second moving part 140 by the two ball members 147 and 148 on the holding part 120, and thus the driving force of the second driving part is reduced. It moves in the Y direction along the guide part 146 by this.

At this time, in the first moving part 130, the movement of the ball member 139 accommodated in the guide part 136 of the first moving part 130 and the guide part 111 of the pedestal 110 is restricted in the Y direction. Therefore, it does not move in the Y direction. On the other hand, the guide parts 134 and 135 of the first moving part 130 and the guide parts 124 and 125 of the holding part 120 are formed as substantially V-shaped grooves extending in the Y direction. Therefore, when the holding part 120 moves in the Y direction, the first moving part 130 is fixed to the pedestal 110 and does not move, and the holding part 120 is the guide part 124 of the first moving part 130. It moves along the 125 in the Y direction.

As such, the moving parts 130 and 140 have a relationship between the holding part 120 and the moving parts 130 and 140 to have a degree of freedom for driving in a direction in which the magnetic drive is not performed. When not moving, the moving parts 130 and 140 themselves and the holding part 120 can be easily separated and do not interfere with the movement of other moving parts.

In the above, the structure and operation | movement of the image shake correction apparatus 100 which concerns on this embodiment were demonstrated. Thus, by installing the two moving parts 130 and 140 separately from the holding part 120, the driven weight at the time of moving the holding part 120 can be reduced, thereby improving the correction performance of the lens L. Can be. In addition, the first moving unit 130 and the second moving unit 140 can each move in only one direction. Therefore, since the other moving part does not move itself, the movable range of each moving part 130 and 140 can be moved compared with the case where the holding part 120 is integrally formed with the moving part moving in the XY direction. Is small. Therefore, it is not necessary to enlarge the first coil 152 and the second coil 162, which are the driving force generation sources, in consideration of their movement due to the movement of other moving parts. As such, since the size of the coil can be reduced as compared with the related art, it can contribute to the miniaturization of the device.

In addition, in the scratch compensation device 100, the first moving part 130 and the second moving part 140 supported by the ball member are moved by guiding the ball member along the guide part, and thus the holding part 120 is moved. Is moved. As described above, the first moving unit 130 and the second moving unit 140 may be formed of a magnetic attraction force between the first magnet 151 and the first yoke 153, and the second magnet 161 and the second moving unit 140. It is pressed toward the pedestal 110 by the magnetic attraction acting between the two yokes 163. As a result, since the holding part 120 is also pressed toward the pedestal 110, the movement of the holding part 120 in the tilt direction can be suppressed. The first guide pin 130a and the first guide hole 171, the second guide pin 140a and the second guide hole 172, the third guide pin 140b and the third guide hole 173 The first moving part 130 and the second moving part 140 can be reliably guided in the moving direction by the driving shaft guide.

<Configuration of Load Adjustment Mechanism>

Here, in the drive system with a small load resistance at the time of driving, the input range with respect to the movement range may be small, whereas the resolution of the input allocated to the A / D detection of the microcomputer tends to be lowered. Therefore, the shake correction control accuracy often deteriorates. In addition, if there is a small load variation such as load hysteresis due to frictional resistance or a jam in the sliding part because the total load resistance is small, the influence is greatly affected, and the accuracy of the shake correction control is deteriorated.

In this embodiment, the deterioration of the control of the scratch correction device is prevented by providing a load adjusting mechanism in the drive section. Hereinafter, the load adjustment mechanism which concerns on this embodiment is demonstrated based on FIGS. 8-11. 8 is a plan view showing a schematic configuration of a load adjusting mechanism according to the present embodiment. 9 is a side view illustrating the load adjusting mechanism according to the present embodiment. FIG. 10A is an explanatory diagram for explaining the action of the load adjusting mechanism according to the present embodiment, and shows a state when the drive portion moves in the positive direction. FIG. 10B is an explanatory diagram for explaining the action of the load adjusting mechanism according to the present embodiment, and shows a state when the drive portion moves in the negative direction. 11 is a graph showing the relationship between the input voltage and the sensitivity.

As shown in FIG. 8, the image shake correction device 100 according to the present embodiment includes a first load adjustment mechanism 180 that adjusts the load of the first drive unit, and a second load that adjusts the load of the second drive unit. The adjusting mechanism 190 is provided. As described above, the first load adjustment mechanism 180 includes the leaf spring portion 181, the ball member 182, and the fixing member 184, and the second load adjustment mechanism 190 includes the leaf spring portion ( 191, the ball member 192, and the fixing member 194. Since the 1st load adjustment mechanism 180 and the 2nd load adjustment mechanism 190 are the same structure, the 1st load adjustment mechanism 180 is demonstrated below.

The leaf spring part 181 is a plate-shaped elastic member which loads a 1st drive part by the elastic force. As shown in FIGS. 8 and 9, the leaf spring 181 is fixed to the pedestal 110 by the ball member 182 at one end and the other end thereof by the fixing member 184. The leaf spring 181 applies a load to the first driver by suppressing the movement of the first magnet 151 connected through the ball member 182.

The ball member 182 is a magnetic member in suction contact with the first magnet 151 of the first moving part. A part of the ball member 182 is fixed to one end of the leaf spring portion 181 and the other part is always self-adsorbed to the first magnet 151 and is in point contact with the first magnet 151. That is, the ball member 182 connects the leaf spring 181 and the first magnet 151. When the first moving unit 130 is moved in a predetermined direction (X-axis direction), the leaf spring 181 is curved toward the moving direction of the first moving unit 130 while drawing a curve. Therefore, the movement trajectories of the first moving unit 130 and the leaf spring 181 are slightly different. Therefore, since the 1st load adjustment mechanism 180 which concerns on this embodiment gives a restoring force of the leaf | plate spring part 181 to a 1st drive part without interrupting the movement of the 1st moving part 130 by a 1st drive part, The spring portion 181 and the first magnet 151 are connected to a substantially spherical member such as the ball member 182. Accordingly, when the leaf spring 181 is bent, the ball member 182 moves to slide the side surface of the first magnet 151 to maintain the connection between the leaf spring 181 and the first magnet 151.

In addition, the fixing member 184 is a member for fixing the leaf spring 181 to the pedestal 110, for example, a screw can be used.

Although the load adjustment mechanism which concerns on this embodiment is comprised by attaching the ball member 182 which is a magnetic member to the leaf | plate spring part 181, one end of the leaf | plate spring part 181 which has magnetism is made into the 1st magnet 151. The protrusion may be formed by protruding to the side. In this case, by forming the protrusion part in a substantially hemispherical shape, the leaf spring part 181 may be always in point contact with the first magnet 151.

<Operation of Load Adjustment Mechanism>

The first load adjusting mechanism 180 and the second load adjusting mechanism 190 use the restoring force generated when the leaf springs 181 and 191 are displaced as the load resistance to the first drive unit and the second drive unit. It is a mechanism to give a load. Here, as to the moving amount (sensitivity) of the moving part with respect to the input voltage to the conventional driving part, as shown in the left figure of FIG. 11, the moving part hardly moves immediately after the input voltage is applied, and suddenly exceeds the predetermined input voltage. Started to move. This is because the moving part can be moved with a light force, but is susceptible to frictional resistance and the like, and the resolution of the control input is degraded, making it impossible to control the moving part. This resulted in a decrease in control accuracy.

Thus, the first load adjusting mechanism 180 and the second load adjusting mechanism 190 according to the present embodiment move by using the properties of the leaf springs 181 and 191 which generate a restoring force to return to the original state when deformed. Properly load the unit and optimize the resolution of the input voltage and control sensitivity. Hereinafter, the operation of the load adjustment mechanism will be described based on FIGS. 8, 10A, and 10B. Since the first load adjustment mechanism 180 and the second load adjustment mechanism 190 have the same configuration, only the first load adjustment mechanism 180 will be described below.

First, when the lens L is in the mid-point position, as shown in FIG. 8, one end of the leaf spring 181 is fixed to the pedestal 110 so as not to bend, and the other end of the ball member 182 is formed of the first magnet ( 151 is installed to be attracted to the side of the contact. At this time, since the restoring force does not occur in the leaf spring portion 181, the load applied to the first driving portion is zero.

Subsequently, when the first driving unit moves the first moving unit 130 in the X-axis positive direction, the first magnet 151 also moves in the X-axis positive direction. At this time, as shown in Fig. 10A, the leaf spring portion 181 moves in the positive X-axis direction in the state where the ball member 182 is adsorbed by the first magnet 151, and is in the X-axis positive direction. At this time, the leaf spring portion 181 applies a restoring force acting in the X-axis portion direction as the load resistance to the first drive portion to return to the original state from the shock state. At this time, since the first moving unit 130 is spaced apart from the midpoint position, the load resistance applied to the first driving unit by the leaf spring 181 increases.

On the other hand, when the first driving unit moves the first moving unit 130 in the X-axis sub-direction, the first magnet 151 also moves in the X-axis sub-direction. At this time, the leaf spring portion 181 is moved in the X-axis portion direction in the state in which the ball member 182 is adsorbed to the first magnet 151 as shown in FIG. 휜 state. At this time, the leaf spring portion 181 applies a restoring force acting in the positive X-axis direction in order to return to the original state from the shock state as the load resistance as the load resistance. In this case, as in the case of FIG. 10A, as the first moving part 130 is spaced apart from the mid-point position, the load resistance applied to the first driving part by the leaf spring part 181 increases.

When the load resistance is applied to the first drive unit by the first load adjustment mechanism 180 as described above, the first moving unit 130 starts to move smoothly when the input voltage is applied, as shown in the right figure of FIG. It moves at almost constant speed. As a result, the input range for the moving range can be optimally allocated to the A / D of the microcomputer, thereby improving the control accuracy of the moving unit.

Here, the leaf spring portion 181 of the first load adjustment mechanism 180 may allow the first moving portion 130 to move even when the first driving portion drives the first moving portion 130 with the maximum driving force. Configured to apply a load to the drive. That is, when the load resistance by the leaf spring portion 181 is larger than the size that can be moved by the maximum driving force of the first driving portion, a larger driving force is required to drive the holding portion 120, thereby increasing power consumption. The 1st load adjustment mechanism 180 which concerns on this embodiment applies a load to a 1st drive part in order to move the 1st moving part 130 smoothly.

Moreover, in the 1st load adjustment mechanism 180 which concerns on this embodiment, power consumption can be reduced by providing the leaf | plate spring part 181 so that a restoring force may become zero when lens L exists in a midpoint position. For example, it is assumed that the leaf spring member 181 is provided such that the restoring force becomes zero at the position where the first moving part 130 is displaced in the X-axis direction in the maximum direction. At this time, the restoring force of the leaf spring 181 always acts on the first moving unit 130 near the midpoint in the moving range of the first moving unit 130. However, in the OIS control, since the lens L is often returned to the center point or maintained at the midpoint position, a force that opposes the restoring force of the leaf spring portion 181 must be generated at all times, thereby increasing the power consumption.

Thus, when the lens L is present in the midpoint position as in the first load adjustment mechanism 180 according to the present embodiment, the lens L is configured to be in a neutral state without restoring force, so that the lens L is in the midpoint position. The restoring force of the leaf spring portion 181 when located near the position can be reduced. This can reduce power consumption when the lens L is returned to the center point or held at the center point position.

Moreover, the 1st load adjustment mechanism 180 has only one leaf spring part 181 as an elastic member. At this time, even if the first moving unit 130 moves in any of the moving directions, it may be considered to make a plurality of elastic members to apply a load resistance to the first driving unit for moving the first moving unit 130. have. However, in the 1st load adjustment mechanism 180 which concerns on this embodiment, the said mechanism was implement | achieved using one leaf spring part 181. FIG.

That is, as described above, when the lens L is in the mid-point position, the leaf spring portion 181 is configured to be in a neutral state, so that the first moving portion 130 is in the neutral position in any direction of FIG. 10A or 10B. Even if it is moved, the load resistance may be applied to the first driving unit using only one leaf spring 181. As a result, since the number of parts can be reduced, the scratch compensation device 100 can be miniaturized, thereby reducing the cost.

In the above, the image shake correction apparatus 100 which concerns on embodiment of this invention was demonstrated. According to this embodiment, the 1st drive part which drives the 1st moving part 130 and the 2nd moving part 140, and the load adjustment mechanism 180 and 190 which apply a load resistance to a 2nd drive part are provided. Thereby, the influence of the load fluctuation which the 1st moving part 130 and the 2nd moving part 140 receive at the time of a movement can be reduced, and the control precision of the image shake correction apparatus 100 can be improved. In addition, since the load resistance can be applied to the first drive unit and the second drive unit by one leaf spring unit 181, 191, the device can be miniaturized and the cost can be reduced. In addition, by configuring the first load adjusting mechanism 180 and the second load adjusting mechanism 190 such that the leaf springs 181 and 191 are in a neutral state when the lens L is in the mid-point position, the image correction is performed by the image shake correction. Power consumption can be reduced.

As mentioned above, although preferred embodiment of this invention was described in detail with reference to an accompanying drawing, this invention is not limited to the said example. It will be apparent to those skilled in the art that the present invention can conceive various modifications or modifications within the scope of the technical idea described in the claims, and naturally belong to the technical scope of the present invention. It is understood that.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the structure of the image shake correction apparatus which concerns on 1st Embodiment of this invention.

Fig. 2 is a perspective view showing the configuration of a scratch correction device according to the embodiment.

FIG. 3 is a plan view showing the configuration of the image shake correction apparatus according to the embodiment, showing a state in which the second moving part and the second magnet are excluded from the state of FIG. 1.

FIG. 4 is a plan view showing the configuration of the image shake correction apparatus according to the embodiment, showing a state in which the first moving part, the second moving part, the first magnet and the second magnet are excluded from the state of FIG. 1.

5 is a partial rear view showing the configuration of the first moving unit and the second moving unit according to the embodiment.

FIG. 6 is a plan view showing the configuration of the image shake correction apparatus according to the embodiment, showing a state where a cover plate is provided in the state of FIG. 1. FIG.

FIG. 7 is a perspective view showing a configuration of the image shake correction device shown in FIG. 6.

8 is a plan view showing a schematic configuration of a load adjustment mechanism according to the embodiment.

9 is a side view showing a load adjusting mechanism according to the embodiment.

FIG. 10A is an explanatory diagram for explaining the action of the load adjusting mechanism according to the present embodiment, and shows a state when the drive unit moves in the positive direction.

FIG. 10B is an explanatory diagram for explaining the action of the load adjusting mechanism according to the present embodiment, and shows a state when the drive unit moves in the negative direction.

11 is a graph showing the relationship between input voltage and sensitivity.

<Description of the code>

100: image correction device

110: pedestal

120: holding part

130: first moving part

140: second moving part

150: first driving unit

151: first magnet

152: first coil

161: second magnet

162: second coil

170: cover plate

180: first load adjustment mechanism

181,191: leaf spring part

182,192: ball member

184,194: stationary member

190 Second: Load Adjustment Mechanism

L: Lens

Claims (8)

Holding part for holding the lens, A moving part installed independently of the holding part to move the holding part on a plane substantially perpendicular to the optical axis of the lens; A driving unit for driving the moving unit, Pedestal for supporting the holding portion, A pressing member for applying a force to the moving part to press the holding part toward the pedestal; A load adjusting mechanism for applying a load to the drive unit; And, The moving part includes a first moving part which moves the holding part in a first direction, and a second moving part which moves the holding part in a second direction perpendicular to the first direction, The driving part includes a first driving part for driving the first moving part and a second driving part for driving the second moving part, And the load adjustment mechanism is provided to the first drive unit and the second drive unit, respectively, to apply a load to the respective drive units by the restoring force of the elastic members displaced in accordance with the movement of the respective moving units. The method of claim 1, The elastic member of the load adjustment mechanism is a leaf spring, One end of the leaf spring is fixed to the pedestal, The other end of the leaf spring is an image shake correction device that is installed to be movable in accordance with the movement of the moving part. The method of claim 2, The leaf spring is, It is installed so that the restoring force at the initial position where the lens exists at the midpoint position becomes zero, An image shake correction device for applying a restoring force generated in the leaf spring displaced according to the movement of the moving part of the drive unit to the drive unit as a load. The method of claim 3, wherein And the leaf spring is configured to apply a load to the driving unit such that the moving unit is movable when the driving unit drives the moving unit with the maximum driving force. The method according to any one of claims 2 to 4, The first driver and the second driver, Magnets which are respectively provided on opposite sides of the pedestal of the first moving part and the second moving part to generate a magnetic field substantially parallel to the optical axis of the lens; A coil installed to face the magnet of the pedestal, Made up of And a leaf spring of the load adjusting mechanism has magnetism, and the other end of the leaf spring is always attracted to the magnet. The method of claim 5, The leaf spring has a projection projecting toward the magnet at the other end of the leaf spring, The image shake correction device that the projection and the magnet in contact. The method of claim 6, The projection correction device of the hemispherical shape is approximately hemispherical. The method of claim 6, And said projection is formed by providing a ball member at the other end of said leaf spring.

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