JP5208691B2 - Image blur correction device - Google Patents

Description

  The present invention relates to an image blur correction apparatus, and more particularly to a lens shift type image blur correction apparatus.

  The image blur correction device is a device that prevents blurring of an image such as a captured image in an imaging device such as a camera or a video camera. In recent years, with an increase in the number of pixels of an image pickup device such as a CCD (Charge Coupled Device), when an image is enlarged and displayed on a display device such as a display, even a slight blur has become noticeable. Also, image blur correction devices have been installed.

  Image blur correction apparatuses are roughly classified into two systems, a lens shift system and a CCD shift system. A lens shift type image blur correction device corrects image blur by driving some lenses in a copper mirror according to camera shake. In such a system, since the lens to be driven is lightweight, it can be configured by a weak actuator, but lens design is difficult. On the other hand, a CCD shift type image blur correction device corrects image blur by driving a CCD according to camera shake. This method can be configured only on the image pickup apparatus side regardless of the lens configuration, but a powerful actuator is required because the weight of the CCD to be driven is heavy. For this reason, it is difficult to reduce the size of the imaging apparatus, and there is a problem that the power consumption of the actuator is large.

  In order to solve the above-described problem in the lens shift type image blur correction apparatus, Patent Document 1 discloses that a moving unit movable in the correction direction while holding an image blur correction lens is substantially perpendicular to the optical axis of the lens. An image blur that corrects the position of the lens by integrally providing a magnet that is part of the drive unit for moving in two directions and generating an electromagnetic driving force on the magnet by a coil provided on the base that supports the moving unit A correction device is disclosed. Such an image blur correction device can be realized with a simple structure. Further, in Patent Document 2, a moving unit that moves the holding unit and a lens holding unit are integrally formed, and a ball member is held between the holding unit and the base, and the holding unit is used as a base. An image blur correction device that is biased toward the table side is disclosed. In such an image blur correction device, the ball member is provided so as to always roll within the correction range for correcting the lens, and the sliding resistance that adversely affects the correction driving force can be reduced.

  On the other hand, Patent Document 3 discloses an image blur correction device in which a holding unit that holds a lens and a moving unit that moves the holding unit are formed separately. In such an image blur correction device, the holding unit and the moving unit are separated from each other, whereby the lens can be easily moved in each moving direction.

US Pat. No. 5,835,799 US Pat. No. 6,064,827 Japanese Patent Laid-Open No. 04-180040

  However, since the image blur correction apparatuses of Patent Document 1 and Patent Document 2 are configured integrally with a holding unit that holds a lens and a moving unit that moves the holding unit, the holding unit moves only in one direction. All moving parts are also driven in the case of making them. That is, there is a problem that the weight of the moving part that does not need to move is also included in the driven weight, and the correction driving performance tends to deteriorate. Moreover, since it is necessary to ensure the movement range of the moving part which does not need to move, there also exists a problem that an apparatus becomes easy to enlarge.

  Furthermore, in the image blur correction apparatus disclosed in Patent Document 2, when the moving unit moves relative to the base, the moving unit is not reliably regulated in two directions. For this reason, even when the holding unit is moved only in one direction, crosstalk that slightly moves in the other direction occurs and the correction performance tends to be a problem.

  Further, in the image blur correction apparatus disclosed in Patent Document 3, backlash occurs between the lens holding unit and the moving unit in the correction direction and the optical axis direction of the lens, which is a problem in correction performance. Furthermore, since the moving part is provided in the outer frame of the holding part for holding the lens, there is a problem that the apparatus becomes large.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved image blur that can reduce the size of the apparatus without degrading the correction performance. It is to provide a correction device.

  In order to solve the above-described problem, according to an aspect of the present invention, a holding unit that holds a lens and a holding unit that is provided independently of the holding unit and is substantially perpendicular to the optical axis of the lens. A moving unit that moves, a driving unit that drives the moving unit, a base that supports the holding unit, a pressing member that applies force to the moving unit and presses the holding unit toward the base, and applies a load to the driving unit An image blur correction device including a load adjustment mechanism is provided. The moving unit includes a first moving unit that moves the holding unit in the first direction and a second moving unit that moves the holding unit in a second direction orthogonal to the first direction. The unit includes a first driving unit that drives the first moving unit and a second driving unit that drives the second moving unit. The load adjustment mechanism is provided in each of the first drive unit and the second drive unit, and applies a load to each drive unit by the restoring force of an elastic member that is displaced as the movement unit moves.

  According to the present invention, the holding unit that holds the lens is moved by the first moving unit and the second moving unit that are provided independently of the holding unit. When the holding unit is moved in the first direction, only the first moving unit acts on the holding unit by driving the first driving unit. On the other hand, when the holding unit is moved in the second direction, only the second moving unit acts on the holding unit by driving the second driving unit. Thus, by separating the holding unit and the two moving units, it is possible to reduce the amount of drive when moving the holding unit and improve the correction performance. In addition, since the two moving units move only in one direction, the moving range of each moving unit can be reduced, and the apparatus can be downsized. Furthermore, it can prevent that a holding | maintenance part rotates by pressing a holding | maintenance part to the base side with a pressing member.

  The image blur correction device according to the present invention includes a first drive unit that drives the first moving unit and the second moving unit, and a load adjustment mechanism that applies load resistance to the second drive unit. Thereby, the influence of the load fluctuation which the 1st moving part and the 2nd moving part receive at the time of movement can be reduced, and the control accuracy of an image blur correction device can be improved.

  Here, a leaf spring can be used as the elastic member of the load adjusting mechanism. At this time, one end of the leaf spring is fixed to the base, and the other end of the leaf spring is movably provided as the moving portion moves.

  The leaf spring is provided so that the restoring force at the initial position where the lens is located at the midpoint position becomes zero, and the restoring force generated in the leaf spring displaced with the movement of the moving portion of the driving portion is used as a load. You may provide so that it may give to a drive part. In this way, by configuring the load adjustment mechanism so that the leaf spring is in a neutral state where the restoring force is zero when the lens is at the midpoint position, the power consumption due to image blur correction can be reduced. .

  Further, 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.

  The first drive unit and the second drive unit are respectively provided on the surfaces of the first moving unit and the second moving unit facing the base, and are substantially parallel to the optical axis of the lens. It can comprise so that it may consist of the magnet which generate | occur | produces a magnetic field, and the coil provided facing the magnet of a base. At this time, the leaf spring of the load adjusting mechanism is magnetized, and the other end of the leaf spring is always attracted to the magnet.

  Further, the leaf spring may be provided with a protrusion protruding toward the magnet side at the other end of the leaf spring. At this time, the protrusion and the magnet come into contact with each other. Further, the protrusion can be formed in a substantially hemispherical shape. Or a projection part can also be formed by providing a ball member in the other end of a leaf | plate spring.

  As described above, according to the present invention, it is possible to provide an image blur correction apparatus capable of downsizing the apparatus without deteriorating correction performance.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  First, the configuration of an image blur correction apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the configuration of the image blur correction apparatus according to the present embodiment. FIG. 2 is a perspective view showing the configuration of the image blur correction apparatus according to the present embodiment. FIG. 3 is a plan view showing the configuration of the image blur correction apparatus according to the present embodiment, and shows a state in which the second moving unit 140 and the second magnet 161 are removed from the state of FIG. FIG. 4 is a plan view showing the configuration of the image blur correction apparatus according to the present embodiment. From the state of FIG. 1, the first moving unit 130, the second moving unit 140, the first magnet 151, and the second moving unit are illustrated. The state where the magnet 161 is removed is shown. FIG. 5 is a partial rear view showing configurations 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 blur correction apparatus according to the present embodiment, and shows a state in which a cover plate is provided in the state of FIG. FIG. 7 is a perspective view showing the configuration of the image blur correction apparatus shown in FIG.

<Configuration of image blur correction device>
The image blur correction apparatus according to the present embodiment is a lens shift type image blur correction apparatus provided in a shutter portion of an imaging apparatus such as a camera or a video camera. As shown in FIGS. 1 to 3, the image blur correction apparatus 100 according to the present embodiment is supported by a base 110 and holds a lens L, and moves the holding unit 120 in a first direction. The first moving unit 130, the second moving unit 140 that moves the holding unit 120 in the second direction, the first driving unit that drives the first moving unit 130, and the second moving unit 140 And a second driving unit to be driven.

  The holding unit 120 is a member that holds the lens L. As shown in FIG. 1, the holding unit 120 holds the lens L inside, a substantially cylindrical lens holding unit 120 a extending in the optical axis direction of the lens L, and a support that supports the lens holding unit on the base 110. It consists of a board. The support plate is a plate-like member that is composed of three portions denoted by reference numerals 120b, 120c, and 120d in FIG. 1 and that is perpendicular to the optical axis of the lens L. The holding unit 120 has a support plate supported at three points on the base 110 by three ball members, and is provided so as to be movable on a plane perpendicular to the optical axis of the lens L. The holding unit 120 is moved in a first direction and a second direction orthogonal to the first direction as the first moving unit 130 and the second moving unit 140 described later move. Details of this operation will be described later.

  Further, as shown in FIG. 4, magnets 128 and 129 for detecting the movement amounts of the first moving unit 130 and the second moving unit 140 are provided on the surface of the holding unit 120 facing the base 110. It has been. Hall elements 195 and 196 are provided at positions facing the magnets 128 and 129 of the base 110. By detecting the movement amounts of the first moving unit 130 and the second moving unit 140 by the Hall elements 195 and 196, the moving amount of the holding unit 120 can be grasped. A control unit (not shown) of the image blur correction apparatus 100 calculates a control amount for correcting image blur using a movement amount of the holding unit 120 detected from the Hall elements 195 and 196. By passing current through the first coil 152 and the second coil 162 in accordance with the control amount, the first moving unit 130 and the second moving unit 140 are moved, and finally the holding unit 120 of the lens L. Move.

  The first moving unit 130 is a member that moves the holding unit 120 in a first direction, for example, the X direction. The first moving unit 130 is provided on a plane perpendicular to the optical axis of the lens L, and is supported by a ball member at two points on the holding unit 120 and one point on the base 110. The first moving unit 130 can move with the holding unit 120 in the X direction, and can move with respect to the holding unit 120 in the Y direction perpendicular to the X direction, that is, the first moving unit 130 alone. Can move.

  As shown in FIG. 5, three guide portions 134, 135, and 136 that guide the ball member are provided on the surface of the first moving portion 130 that faces the base 110. The guide portions 134 and 135 can be formed as, for example, substantially V-shaped grooves extending in the Y direction, and accommodate a ball member that supports the first moving portion 130 on the holding portion 120. The guide part 136 can be formed as a substantially V-shaped groove extending in the X direction, for example, and accommodates a ball member that supports the first moving part 130 on the base 110. As shown in FIG. 4, guide portions 124, 125 having substantially the same shape as the guide portions 134, 135, 136 are located at positions on the holding portion 120 and the base 110 facing the guide portions 134, 135, 136. 111 are formed.

  As shown in FIG. 1, a through hole 133 is formed in the center of the first moving unit 130. As shown in FIG. 5, a substantially rectangular parallelepiped first magnet 151 is provided on the surface of the first moving unit 130 facing the base 110 so as to cover the through-hole 133. On the two side surfaces of the first magnet 151 facing a second magnet 161 described later, a substantially L-shaped first shielding member 132 that covers the side surface is provided. The shielding member 132 is provided in order to reduce the attractive force with which the first magnet 151 and a second magnet 161 described later attract each other. Thereby, it is possible to prevent the attractive force generated by the first magnet 151 and the second magnet 161 from affecting the driving force generated by the driving unit.

  Further, as shown in FIGS. 2, 6, and 7, a first guide pin 130 a that is inserted into a first guide hole 171 formed in the cover plate 170 is provided on the upper surface of the first moving unit 130. . The first guide pin 130 a constitutes a drive shaft guide together with the first guide hole 171. The first guide pin 130a guides the first moving unit 130 to move in the first direction when the first moving unit 130 is driven by the first driving unit.

  The second moving unit 140 is a member that moves the holding unit 120 in a second direction perpendicular to the first direction, for example, the Y direction. As shown in FIG. 1, the second moving unit 140 is provided on a plane perpendicular to the optical axis of the lens L, like the first moving unit 130, and has two points on the holding unit 120 and a base. It is supported by a ball member at one point on 110. The second moving unit 140 can move with the holding unit 120 in the Y direction, and can move with respect to the holding unit 120 in the X direction perpendicular to the Y direction, that is, the second moving unit 140 alone. Can move. Further, the second moving unit 140 according to the present embodiment is arranged substantially symmetrically with the first moving unit 130 with respect to a straight line connecting the center of the lens L and the center of a balance member 115 described later.

  As shown in FIG. 5, three guide portions 144, 145, and 146 that guide the ball member are provided on the surface of the second moving portion 140 that faces the base 110. The guide portions 144 and 145 can be formed as, for example, substantially V-shaped grooves extending in the X direction, and accommodate a ball member that supports the second moving portion 140 on the holding portion 120. The guide portion 146 can be formed as a substantially V-shaped groove extending in the Y direction, for example, and accommodates a ball member that supports the second moving portion 140 on the base 110. As shown in FIG. 4, guide parts 126, 127, 127 having the same shape as the guide parts 144, 145, 146 are positioned on the holding part 120 and the base 110 so as to face the guide parts 144, 145, 146. 112 is formed.

  A through hole 143 is formed at the center of the second moving unit 140. As shown in FIG. 5, a substantially rectangular parallelepiped second magnet 161 is provided on the surface of the second moving unit 140 facing the base 110 so as to cover the through hole 143. On the two side surfaces of the second magnet 161 facing the first magnet 151, a substantially L-shaped second shielding member 142 that covers the side surface is provided. Similar to the first shielding member 132, the shielding member 142 is provided in order to reduce the attractive force with which the first magnet 151 and the second magnet 161 attract each other. In the present embodiment, the first moving unit 130 and the second moving unit 140 are arranged on the same plane perpendicular to the optical axis of the lens L.

  Further, as shown in FIGS. 2, 6, and 7, a second guide hole 172 and a third guide hole 173 formed in the cover plate 170 are inserted into the upper surface of the second moving part 140. Two guide pins 140a and a third guide pin 140b are provided. The second guide pin 140a and the third guide pin 140b constitute a drive shaft guide together with the second guide hole 172 and the third guide hole 173, respectively. The second guide pin 140a and the third guide pin 140b are arranged such that when the second moving unit 140 is driven by the second driving unit, the second moving unit 140 moves in the second direction. invite.

  The first drive unit is a drive unit that drives the first moving unit 130 in the X direction, which is the first direction, and the first magnet 151 provided in the first moving unit 130 (see FIG. 5). And a first coil 152 shown in FIG. For example, a voice coil motor (hereinafter referred to as “VCM”) can be used as the first drive unit. The first driving unit uses the driving force in the X direction generated by Fleming's left-hand rule when a current is passed through the first coil 152 in the magnetic field generated by the first magnet 151. Are moved in the X direction. The first coil 152 is formed by winding a conducting wire around the optical axis direction of the lens L, and is provided on the base 110 corresponding to the movable range of the first moving unit 130.

  The first magnet 151 constituting the first drive unit is provided with a first load adjustment mechanism 180 that applies a load resistance to the first drive unit when the first drive unit is driven. As shown in FIG. 4, the first load adjustment mechanism 180 includes a leaf spring portion 181, a ball member 182, and a fixing member 184, and a ball member 182 is provided at one end of the leaf spring portion 181. The other end of the portion 181 is fixed to the base 110 by a fixing member 184. Details of the first load adjustment mechanism 180 will be described later.

  Further, as shown in FIG. 4, a magnetic first yoke 153 is provided between the first coil 152 and the base 110. A magnet attractive force acts between the first magnet 151 and the first yoke 153. Thereby, the 1st moving part 130 provided with the 1st magnet 151 is attracted to the base 110 side.

  The second drive unit is a drive unit that drives the second moving unit 140 in the Y direction, which is the second direction, and a second magnet 161 provided in the second moving unit 140 (see FIG. 5). And the second coil 162 shown in FIG. The second drive unit can also use, for example, a VCM. Similar to the first driving unit, the second driving unit uses a driving force in the Y direction generated when a current is passed through the second coil 162 in the magnetic field generated by the second magnet 161. The second moving unit 140 is moved in the Y direction. The second coil 162 is formed by winding a conducting wire around the optical axis direction of the lens L, and is provided on the base 110 corresponding to the movable range of the second moving unit 140.

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

  Further, as shown in FIG. 4, a magnetic second yoke 163 is provided between the second coil 162 and the base 110. Since a magnet attractive force acts between the second magnet 161 and the second yoke 163, the second moving part 140 provided with the second magnet 161 is attracted to the base 110 side.

  The first moving unit 130 and the second moving unit 140 do not have the center of gravity at the same position as the center of the lens L. For this reason, there is a possibility that a rotation moment is generated by moving the first moving unit 130 and the second moving unit 140, and the holding unit 120 rotates. Therefore, as shown in FIG. 1, a balance member 115 is provided between the first moving unit 130 and the second moving unit 140 of the base 110 so that the movement is balanced by the weight of the balance member 115. It may be configured.

  The configuration of the image blur correction apparatus 100 according to the present embodiment has been described above. The image blur correction apparatus 100 corrects the image blur by moving the holding unit 120 that holds the lens L by the first moving unit 130 and the second moving unit 140 that are independent of each other. Hereinafter, the operation of the image blur correction apparatus 100 according to the present embodiment will be described.

<Operation of image blur correction device>
As described above, the image blur 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. To move the lens L. At this time, as shown in FIG. 4, the holding unit 120 that holds the lens L is supported on the base 110 by three ball members 121, 122, and 123, and is perpendicular to the optical axis of the lens L. The XY plane can be moved.

  Further, as described above, the first moving unit 130 includes the holding units by the ball members 137 and 138 housed in the guide units 134 and 135 of the first moving unit 130 and the guide units 124 and 125 of the holding unit 120. It is supported on 120 and supported on the base 110 by a ball member 139 accommodated in the guide part 136 of the first moving part 130 and the guide part 111 of the base 110. The second moving unit 140 is supported on the holding unit 120 by ball members 147 and 148 accommodated in the guide units 144 and 145 of the second moving unit 140 and the guide units 126 and 127 of the holding unit 120. The ball member 149 accommodated in the guide part 146 of the second moving part 140 and the guide part 112 of the base 110 is supported on the base 110.

  The holding unit 120 is moved in the X direction along with the movement of the first moving unit 130 by the driving force of the first driving unit. That is, when the first driving unit generates 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 arranged in the X direction by the substantially V-shaped grooves shown in FIG. Movement is regulated. On the other hand, the ball member 139 accommodated in the guide part 136 of the first moving part 130 and the guide part 111 of the base 110 is not restricted in the movement in the X direction and is substantially V extending in the X direction. Guided along a letter-shaped groove. Accordingly, the holding unit 120 that can move on the XY plane is integrated with the first moving unit 130 by the two ball members 137 and 138 on the holding unit 120, and is guided by the driving force of the first driving unit. It is moved in the X direction along 136.

  At this time, the second moving unit 140 is configured such that the movement of the ball member 149 accommodated in the guide unit 146 of the second moving unit 140 and the guide unit 112 of the base 110 is restricted in the X direction. 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 unit 120 moves in the X direction, the second moving unit 140 is fixed to the base 110 and does not move, and the holding unit 120 moves along the guide units 126 and 127 of the second moving unit 140. It will be moved in the X direction.

  The holding unit 120 is moved in the Y direction along with the movement of the second moving unit 140 by the driving force of the second driving unit. That is, when the second driving unit generates a 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 portions 144 and 145 of the second moving portion 140 and the guide portions 126 and 127 of the holding portion 120 are moved in the Y direction by the substantially V-shaped grooves shown in FIG. Movement is regulated. On the other hand, the ball member 149 accommodated in the guide part 146 of the second moving part 140 and the guide part 112 of the base 110 is not restricted in movement in the Y direction, and is substantially V extending in the Y direction. Guided along a letter-shaped groove. Therefore, the holding unit 120 that can move on the XY plane is integrated with the second moving unit 140 by the two ball members 147 and 148 on the holding unit 120, and is guided by the driving force of the second driving unit. 146 along the Y direction.

  At this time, the first moving unit 130 is configured such that the movement of the ball member 139 accommodated in the guide unit 136 of the first moving unit 130 and the guide unit 111 of the base 110 is restricted in the Y direction. 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 unit 120 moves in the Y direction, the first moving unit 130 is fixed to the base 110 and does not move, and the holding unit 120 moves along the guide units 124 and 125 of the first moving unit 130. It will be moved in the Y direction.

  In this way, the holding unit 120 and each of the moving units 130 and 140 are allowed to have a relationship of engagement with a degree of freedom in driving in the direction in which they are not driven. When the parts 130 and 140 do not move, the moving parts 130 and 140 themselves and the holding part 120 can be easily separated, and movement of other moving parts is not hindered.

  The configuration and operation of the image blur correction apparatus 100 according to the present embodiment have been described above. Thus, by providing the two moving parts 130 and 140 separately from the holding part 120, the driven weight when the holding part 120 is moved can be reduced, and the correction performance of the lens L is improved. be able to. Further, each of the first moving unit 130 and the second moving unit 140 can move only in one direction. For this reason, when the other moving part moves, it does not move, so that the movable range of each of the moving parts 130 and 140 can be compared with the case where the holding part 120 is formed integrally with the moving part that moves in the XY direction. Is small. Therefore, it is not necessary to enlarge the first coil 152 and the second coil 162 that are driving force generation sources in consideration of their own movements accompanying movements of other moving parts. Thus, since the size of the coil can be reduced as compared with the conventional case, it can contribute to the downsizing of the apparatus.

  In the image blur correction apparatus 100, the first moving unit 130 and the second moving unit 140 supported by the ball member move when the ball member is guided along the guide unit, and accordingly. The holding unit 120 is moved. As described above, the first moving unit 130 and the second moving unit 140 include the magnetic attractive force acting between the first magnet 151 and the first yoke 153, and the second magnet 161 and the second moving unit 140. The magnetic attraction force acting between the yoke 163 and the base 110 is pressed. Thereby, since the holding | maintenance part 120 is also pressed to the base 110 side, the movement of the tilting direction of the holding | maintenance part 120 can be suppressed. Further, a drive shaft guide including a first guide pin 130 a and a first guide hole 171, a second guide pin 140 a and a second guide hole 172, a third guide pin 140 b and a third guide hole 173. Thus, the first moving unit 130 and the second moving unit 140 can be reliably guided in the moving direction.

<Configuration of load adjustment mechanism>
Here, in a drive system in which the load resistance during driving is very small, the input range relative to the moving range may normally be small, but the input resolution assigned to the A / D detection of the microcomputer tends to be small. For this reason, the control accuracy of image blur correction often deteriorates. In addition, if there is a minute load fluctuation, such as load hysteresis due to frictional resistance or catching at the sliding part, the influence is greatly affected, and the control accuracy of image blur correction deteriorates. End up.

  Therefore, in the present embodiment, control deterioration of the image blur correction apparatus is prevented by providing a load adjustment mechanism in the drive unit. Hereinafter, based on FIGS. 8-11, the load adjustment mechanism concerning this embodiment is demonstrated. FIG. 8 is a plan view showing a schematic configuration of the load adjustment mechanism according to the present embodiment. FIG. 9 is a side view showing the load adjustment mechanism according to the present embodiment. FIG. 10A is an explanatory diagram for explaining the operation of the load adjustment 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 operation of the load adjustment mechanism according to the present embodiment, and shows a state when the drive unit moves in a negative direction. FIG. 11 is a graph showing the relationship between input voltage and sensitivity.

  As shown in FIG. 8, the image blur correction apparatus 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. Load adjusting mechanism 190. 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 and the ball member 192. And a fixing member 194. Since the first load adjustment mechanism 180 and the second load adjustment mechanism 190 have the same configuration, the first load adjustment mechanism 180 will be described below.

  The leaf spring portion 181 is a plate-like elastic member that applies a load to the first drive portion by its elastic force. As shown in FIGS. 8 and 9, the leaf spring portion 181 has a ball member 182 fixed to one end and the other end fixed to the base 110 by a fixing member 184. The leaf spring portion 181 applies a load to the first drive unit by suppressing the movement of the first magnet 151 connected via the ball member 182.

  The ball member 182 is a magnetic member that is in suction contact with the first magnet 151 of the first moving unit. A part of the ball member 182 is fixed to one end of the leaf spring portion 181, and the other part is always magnetically attracted 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 portion 181 and the first magnet 151. When the first moving part 130 moves in a predetermined direction (X-axis direction), the leaf spring part 181 bends in the moving direction of the first moving part 130 while drawing a curve. For this reason, the locus of movement between the first moving part 130 and the leaf spring part 181 is slightly different. Therefore, the first load adjustment mechanism 180 according to the present embodiment applies the restoring force of the leaf spring portion 181 to the first drive unit without hindering the movement of the first movement unit 130 by the first drive unit. The leaf spring portion 181 and the first magnet 151 are connected by a substantially spherical member such as a ball member 182. As a result, when the leaf spring portion 181 is bent, the ball member 182 moves so as to slide on the side surface of the first magnet 151 and maintains the connection between the leaf spring portion 181 and the first magnet 151.

  The fixing member 184 is a member that fixes the leaf spring portion 181 to the base 110, and for example, a screw can be used.

  The load adjustment mechanism according to the present embodiment is configured by providing the leaf spring portion 181 with a ball member 182 that is a magnetic member, but one end side of the leaf spring portion 181 having magnetism is connected to the first magnet 151 side. The protrusions may be formed by projecting to each other. At this time, the leaf spring portion 181 can always be brought into point contact with the first magnet 151 by making the projection portion have a substantially hemispherical shape.

<Operation of load adjustment mechanism>
The first load adjustment mechanism 180 and the second load adjustment mechanism 190 have the first driving unit and the second driving unit using the restoring force generated when the leaf springs 181 and 191 are displaced as load resistance. It is a mechanism to give to. Here, regarding the movement amount (sensitivity) of the moving unit with respect to the input voltage to the conventional driving unit, as shown in the left diagram of FIG. 11, the moving unit hardly moves immediately after the input voltage is applied, and a predetermined input. When it exceeded the voltage, it started to move rapidly. This is because the moving unit can be moved with a light force, but is easily affected by frictional resistance, etc., and the resolution of the control input is reduced, making it difficult to control the moving unit. For this reason, it has resulted in a decrease in control accuracy.

  Therefore, the first load adjustment mechanism 180 and the second load adjustment mechanism 190 according to the present embodiment utilize the properties of the leaf spring portions 181 and 191 that generate a restoring force to return to the original state when deformed. Apply an appropriate load to the moving part and optimize the resolution of input voltage and control sensitivity. Hereinafter, the operation of the load adjustment mechanism will be described with reference to 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, as shown in FIG. 8, when the lens L exists at the midpoint position, one end of the leaf spring portion 181 is fixed to the base 110 so as not to bend, and the ball member 182 at the other end is the first member. It is provided so as to be attracted and contacted to the side surface of the magnet 151. At this time, since no restoring force is generated in the leaf spring portion 181, the load applied to the first drive portion is zero.

  Next, 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 direction of the X axis while the ball member 182 is attracted to the first magnet 151 and is bent in the positive direction of the X axis. . At this time, the leaf spring portion 181 applies a restoring force acting in the negative direction of the X-axis as a load resistance to the first drive portion so as to return from the bent state to the original state. At this time, as the first moving unit 130 moves away from the midpoint position, the load resistance applied to the first driving unit by the leaf spring unit 181 increases.

  On the other hand, when the first drive unit moves the first moving unit 130 in the X-axis negative direction, the first magnet 151 also moves in the X-axis negative direction. At this time, as shown in FIG. 10B, the leaf spring portion 181 moves in the X-axis negative direction while the ball member 182 is attracted to the first magnet 151, and is bent in the X-axis negative direction. . At this time, the leaf spring portion 181 applies a restoring force acting in the positive direction of the X axis to the first drive portion as a load resistance in an attempt to return to the original state from the bent state. At this time, as in the case of FIG. 10A, the load resistance applied to the first drive unit by the leaf spring unit 181 increases as the first moving unit 130 moves away from the midpoint position.

  As described above, when load resistance is applied to the first drive unit by the first load adjustment mechanism 180, the first moving unit 130 starts to move smoothly when the input voltage is applied, as shown in the right diagram of FIG. It will move at an almost constant speed. Thereby, the input range with respect to the moving range can be optimally allocated to the A / D of the microcomputer, and the control accuracy of the moving unit can be improved.

  Here, the leaf spring portion 181 of the first load adjustment mechanism 180 can move the first moving portion 130 even when the first driving portion drives the first moving portion 130 with the maximum driving force. Thus, it is comprised so that a load may be given with respect to a 1st drive part. That is, if the load resistance by the leaf spring portion 181 is made 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 and the power consumption increases. . The first load adjustment mechanism 180 according to the present embodiment applies a load to the first drive unit in order to move the first moving unit 130 smoothly.

  In the first load adjustment mechanism 180 according to the present embodiment, the power consumption can be reduced by providing the leaf spring portion 181 so that the restoring force becomes zero when the lens L is in the middle position. Can do. For example, it is assumed that the leaf spring member 181 is provided so that the restoring force becomes zero at the position where the first moving unit 130 is displaced maximum in the negative X-axis direction. At this time, the restoring force of the leaf spring 181 always acts on the first moving unit 130 in the vicinity of the middle point in the moving range of the first moving unit 130. However, in the OIS control, the lens L is often returned to the middle point or held at the middle point position. Therefore, a force against the restoring force of the leaf spring portion 181 must always be generated, and the power consumption There is a problem that becomes larger.

  Therefore, like the first load adjustment mechanism 180 according to the present embodiment, the lens spring 181 is configured to be in a neutral state having no restoring force when the lens L exists at the midpoint position, whereby the lens The restoring force of the leaf spring portion 181 when L is located in the vicinity of the midpoint position can be reduced. Thereby, the power consumption when the lens L is returned to the middle point or held at the middle point position can be reduced.

  Further, the first load adjustment mechanism 180 has only one leaf spring portion 181 as an elastic member. At this time, in order to apply load resistance to the first driving unit that moves the first moving unit 130 regardless of which direction the first moving unit 130 moves, a plurality of elastic members are used. It is conceivable to provide it. However, in the first load adjustment mechanism 180 according to the present embodiment, such a mechanism is realized using one leaf spring portion 181.

  That is, as described above, by configuring the leaf spring portion 181 to be in the neutral state when the lens L exists at the neutral point position, the first moving unit 130 is moved from the neutral position to either FIG. 10A or FIG. 10B. Even when moving in the direction, the load resistance can be applied to the first drive unit by only one leaf spring portion 181. Thereby, since the number of parts can be reduced, the image blur correction apparatus 100 can be reduced in size and cost can be reduced.

  The image blur correction apparatus 100 according to the embodiment of the present invention has been described above. According to the present embodiment, the load adjusting mechanisms 180 and 190 that apply load resistance to the first driving unit and the second driving unit that drive the first moving unit 130 and the second moving unit 140 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 blurring correction apparatus 100 can be improved. Further, since the load resistance can be applied to the first drive unit and the second drive unit by the single leaf springs 181 and 191, the apparatus can be miniaturized and the cost can be reduced. Further, by configuring the first load adjustment mechanism 180 and the second load adjustment mechanism 190 so that the leaf springs 181 and 191 are in a neutral state when the lens L is in the middle point position, image blur correction is performed. The power consumption due to can be reduced.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

1 is a plan view showing a configuration of an image blur correction apparatus according to a first embodiment of the present invention. It is a perspective view which shows the structure of the image blurring correction apparatus concerning the embodiment. It is a top view which shows the structure of the image blurring correction apparatus concerning the embodiment, Comprising: The state which remove | excluded the 2nd moving part and the 2nd magnet from the state of FIG. 1 is shown. It is a top view which shows the structure of the image blurring correction apparatus concerning the embodiment, Comprising: The state remove | excluding the 1st moving part, the 2nd moving part, the 1st magnet, and the 2nd magnet from the state of FIG. Show. It is a partial back view which shows the structure of the 1st moving part concerning the same embodiment, and a 2nd moving part. It is a top view which shows the structure of the image blurring correction apparatus concerning the embodiment, Comprising: The state which provided the cover plate in the state of FIG. 1 is shown. It is a perspective view which shows the structure of the image blurring correction apparatus shown in FIG. It is a top view which shows schematic structure of the load adjustment mechanism concerning the embodiment. It is a side view which shows the load adjustment mechanism concerning the embodiment. It is explanatory drawing explaining the effect | action of the load adjustment mechanism concerning this embodiment, Comprising: The state when a drive part moves to a positive direction is shown. It is explanatory drawing explaining the effect | action of the load adjustment mechanism concerning this embodiment, Comprising: The state when a drive part moves to a negative direction is shown. It is a graph which shows the relationship between an input voltage and a sensitivity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Image blur correction apparatus 110 Base 120 Holding | maintenance part 130 1st moving part 140 2nd moving part 150 1st drive part 151 1st magnet 152 1st coil 161 2nd magnet 162 2nd coil 170 Cover plate 180 First load adjustment mechanism 181, 191 Leaf spring portion 182, 192 Ball member 184, 194 Fixing member 190 Second load adjustment mechanism L Lens

Claims (6)

A holding unit for holding the lens;
A moving unit that is provided independently of the holding unit and moves the holding unit on a plane substantially perpendicular to the optical axis of the lens;
A drive unit for driving the moving unit;
A base for supporting the holding part;
A pressing member that applies force to the moving unit to press the holding unit toward the base;
A load adjusting mechanism for applying a load to the drive unit;
With
The moving unit includes a first moving unit that moves the holding unit in a first direction, and a second moving unit that moves the holding unit in a second direction orthogonal to the first direction. Consists of
The driving unit includes a first driving unit that drives the first moving unit and a second driving unit that drives the second moving unit,
The load adjusting mechanism, the first respectively provided on the drive unit and the second driving unit, e given a load to the drive units by the restoring force of the elastic member which is displaced with the movement of the respective mobile unit ,
The elastic member of the load adjusting mechanism is a leaf spring,
One end of the leaf spring is fixed to the base,
The other end of the leaf spring is movably provided along with the movement of the moving part,
The first drive unit and the second drive unit are:
A magnet that is provided on each of the surfaces of the first moving unit and the second moving unit facing the base and generates a magnetic field substantially parallel to the optical axis of the lens;
A coil provided facing the magnet of the base;
Consists of
An image blur correction device in which 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 leaf spring is
Provided such that the restoring force at the initial position where the lens is present at the midpoint position is zero,
The image blur correction device according to claim 1 , wherein a restoring force generated in the leaf spring displaced with the movement of the moving unit of the driving unit is applied to the driving unit as a load. The image blur according to claim 2 , wherein the leaf spring applies a load to the drive unit so that the moving unit is movable when the driving unit drives the moving unit with a maximum driving force. Correction device. The leaf spring includes a protrusion protruding toward the magnet side at the other end of the leaf spring,
The image blur correction device according to claim 1 , wherein the protrusion and the magnet are in contact with each other. The image blur correction device according to claim 4 , wherein the protrusion has a substantially hemispherical shape. The image blur correction device according to claim 4 , wherein the protrusion is formed by providing a ball member at the other end of the leaf spring.

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