JP2005221603A - Image blurring correction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve miniaturization, thinning, reduction of cost and reduction of assembly man-hour in an image blurring correction device provided in a video movie and a digital camera. <P>SOLUTION: In the image blurring correction device, a magnet constituting an actuator for moving an image blurring correction lens is provided with a thick part and a thin part, and the coil of the actuator is opposed to the thick part of the magnet, and a magnetic detection sensor for detecting a position is opposed to the thin part, whereby space between the magnet and the coil and space between the magnet and the magnetic detection sensor are set to be optimum, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a small and thin image blur correction apparatus mounted on a video movie, a digital camera, or the like, and is effective for downsizing a video movie, a digital camera, or the like.

  In recent years, with the spread of digital video movies and cameras, their size and weight have been reduced, and as part of this, an image blur correction device mounted thereon is also desired to be small and thin.

  Conventionally, as this type of image blur correction apparatus, for example, the one disclosed in Patent Document 1 is known.

  A conventional image blur correction apparatus will be described below with reference to FIGS.

  The image blur correction lens 101 is a lens for preventing image blur caused by camera vibration by moving on the X and Y planes. The image blur correction lens 101 is held by a moving frame 102. Yes. The moving frame 102 is a plate-like member supported in a camera barrel (not shown) by elastic bodies 103 to 106 so that the movement on the X and Y planes is movable.

  The moving frame 102 obtains a driving force for moving on the X and Y planes from the coils 107 and 108 attached to the left end and the lower end thereof. The coils 107 and 108 are conductive coils having straight portions 107x and 108y, respectively. The coil 107 is attached to the moving frame 102 so that the straight portion 107x is perpendicular to the X axis and the coil main axis is perpendicular to the X and Y planes. The coil 108 is attached to the moving frame 102 so that the linear portion 108y is perpendicular to the Y axis and the coil main axis is perpendicular to the X and Y planes.

  The permanent magnet 109 and the two yokes 110 and 111 are magnetic field generators. The permanent magnet 109 is obtained by processing a rare earth magnet such as samarium-cobalt into a sector shape by dividing the ring into four equal parts, and the moving frame 102 is arranged so that the center of the sector is directed in the direction of the optical axis A. Located near the side of the lower left corner. In this arrangement state, the direction of polarization of the permanent magnet 109 is such that the surfaces 109a and 109b are N-poles or S-poles and coincide with the direction of the optical axis A. The yokes 110 and 111 each have an L shape with a bent central portion, and are made of a material having high magnetic permeability such as iron. The yokes 110 and 111 are in contact with the surfaces 109a and 109b at curved portions 110a and 111a having substantially the same shape as the surfaces 109a and 109b of the permanent magnet 109. Further, the straight portions 110x, 110y and 111x, 111y of the yokes 110, 111 face each other so as to sandwich the straight portions 107x, 108y of the coils 107, 108.

  The light emitting element 112x, the slit plate 113x, and the light receiving element 114x constitute a detection device for detecting the position of the moving frame 102 in the X-axis direction. Similarly, the light emitting element 112y, the slit plate 113y, and the light receiving element 114y constitute a detection device for detecting the position of the moving frame 102 in the Y-axis direction. Here, the light emitting elements 112x and 112y are light emitting diodes or the like, and are installed in the camera barrel so as to emit light in the direction of the optical axis A. The slit plate 113x provided on the right side surface of the moving frame 102 and the slit plate 113y provided on the upper surface of the moving frame 102 are provided with vertically long slits 115x and 115y, respectively, and the long axis of the slit 115x is parallel to the Y axis. The short axis is arranged to overlap the X axis, and the long axis of the slit 115y is parallel to the X axis, and the short axis is arranged to overlap the Y axis.

  The light receiving elements 114x and 114y are semiconductor light detecting elements such as composite photodiodes (PSD). These light receiving elements 114x and 114y are provided on the opposite side of the optical axis A direction from the light emitting elements 112x and 112y across the slit plates 113x and 113y, and the long axis of the light receiving surface of the light receiving element 114x is parallel to the X axis. Further, the long axis of the light receiving surface of the light receiving element 114y is arranged in parallel with the Y axis.

In the above configuration, the light emitted from the light emitting elements 112x and 112y reaches the light receiving elements 114x and 114y, respectively, with their optical paths restricted by the slits 115x and 115y. Accordingly, when the moving frame 102 moves in the X-axis or Y-axis direction and the positions of the slit plates 113x and 113y change accordingly, the light receiving positions of the light emitting elements 112x and 112y also change. The coils 108 and 107 are energized by a signal output corresponding to the change in the light receiving position by the light receiving elements 114x and 114y, the moving frame 102 is moved by the electromagnetic thrust between the yokes 110 and 111, and the image blur correcting lens 101 is imaged. It is designed to correct blur.
JP-A-8-339005

  However, the conventional image blur correction apparatus has the following problems.

  In other words, in order to detect the position of the moving frame that holds the image blur correction lens, a light-emitting element and a light-receiving element for position detection are provided with the moving frame interposed therebetween, in addition to the coils and permanent magnets that constitute the driving actuator. In addition, since the moving frame has a configuration in which a slit plate is provided, there are a large number of parts of the image blur correction device, and the area and volume occupied by the arrangement are large, and there is a problem that it is not suitable for downsizing. .

  The present invention is an image blur correction apparatus in which an image blur correction lens is controlled to move in two directions in a vertical plane with respect to an optical axis, the image blur correction lens is held, and the first in the vertical plane is held. A first moving frame that moves in the direction of the second moving frame, and a second moving frame that supports the first moving frame in a movable manner and moves with the first moving frame in the second direction within the vertical plane. The fixed frame that supports the second moving frame so as to be movable in the second direction within the vertical plane, and is attached to the first moving frame and / or the second moving frame, and drives the moving frame. A coil for detecting the position, a magnetic detection sensor for position detection attached to the first moving frame and / or the second moving frame including the coil, and the fixed frame so as to face the coil and the magnetic detection sensor. A magnet attached via a yoke, said magnet Has a thin portion thick portion, the thick portion is opposed to the coil, a thin portion image stabilizer is opposed to the magnetic detecting sensor.

  As described above, the present invention can optimize the gap between the magnet and the coil and the gap between the magnet and the magnetic detection sensor by providing the magnet with a thick part and a thin part and changing the thickness. In addition, sufficient thrust as an actuator can be obtained, and the position detection operation by the magnetic detection sensor can be performed with high accuracy.

  And since the magnet as the actuator and the magnet for position detection can be combined with one magnet and the coil and the magnetic detection sensor can be arranged adjacent to each other, the number of parts is small, and the device can be made small and thin. In addition, the assembly man-hours are reduced and the cost can be reduced, and the effect is great.

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

  1 is a perspective view of an image blur correction device, FIG. 2 is a partially exploded perspective view of a movable portion, FIG. 3 is a rear view of a first moving frame portion in FIG. 2, and FIG. 4 is a cross section taken along line ZZ in FIG. FIG. 5 is a perspective view of the Hall element.

  The image blur correction lens 1 is held by a first moving frame that can move up and down, that is, a pitch frame 2. A shaft 3 is fixed to the pitch frame 2 to guide the movement in the vertical direction. A guide hole (not shown) of the pitch frame 2 is fitted with a second moving frame, that is, a shaft 4 a fixed to the yaw frame 4, and the groove 4 b provided in the yaw frame 4 Since the shaft 3 is fitted, the pitch frame 2 is movable in the vertical direction with respect to the yaw frame 4.

  On the other hand, the yaw frame 4 is similar to the above in that the shaft 4c fixed thereto is fitted into a groove (not shown) of the fixed frame 5 and the shaft of the fixed frame 5 is fitted into the guide hole. With this configuration, it is configured to be movable in the left-right direction with respect to the fixed frame 5. As a result, the image blur correction lens 1 can be moved vertically and horizontally with respect to the fixed frame 5.

  Coils 6 a and 6 b for driving the image blur correction lens 1 are fixed to the laminated substrate 6 provided by plating on the back side of the pitch frame 2. The laminated substrate 6 extends below the lower end of the pitch frame 2, the coil 6 a is positioned below the image blur correction lens 1, and the coil 6 b is positioned on the side of the image blur correction lens 1. ing. Then, a flexible printed board 7 having substantially the same shape as this and having a lead portion 7e is bent and bonded and fixed to the surface of the multilayer substrate 6 with the lead portion 7e. 6 and a flexible printed board 7. The terminals of the coils 6a and 6b are connected by soldering at the land portions 7a and 7b of the flexible printed board 7.

  With such a configuration, the coils 6a and 6b that move together with the pitch frame 2 using the flexibility of the lead portion 7e via the non-movable terminal portion 7f provided at the tip of the lead portion 7e of the flexible printed board 7. It is possible to supply electric signals and power to and the like.

  The laminated substrate 6 is fixed to the pitch frame 2 by inserting the pins 2a and 2b provided in the pitch frame 2 into the reference holes 6e and 6f provided in the laminated substrate 6 and fixing them with high positional accuracy by adhesion or the like. The laminated substrate 6 is provided with reference holes 6c and 6d for positioning the Hall elements (magnetic detection sensors) 8a and 8b for detecting the position of the image blur correction lens 1 with high accuracy. Yes. The reference holes 6c, 6d and 6e, 6f are in a highly accurate positional relationship by simultaneous punching with a mold.

  The shapes of the reference holes 6c and 6d are formed slightly smaller than the outer shape of the Hall elements 8a and 8b, one of which is representatively shown in FIG. 5, so that the Hall elements 8a and 8b are formed in the reference holes 6c and 6d. By simply press-fitting lightly, the hall elements 8a and 8b are positioned with high accuracy without being rattled by the reference holes 6c and 6d, and are mounted at positions adjacent to the coils 6a and 6b.

  In the flexible printed board 7, holes are provided at positions corresponding to the reference holes 6c, 6d, 6e, 6f, etc., and the above-mentioned laminated substrate 6 is fixed to the pitch frame 2 and hall elements 8a, 8b. Installation is allowed.

  With the configuration as described above, the mounting of the laminated frame 6 and the mounting of the hall elements 8a and 8b to the pitch frame 2 can be performed with high accuracy by mounting the pitch frame 2 with the fixed frame 5 as a base. The positional accuracy of the coils 6a and 6b and the hall elements 8a and 8b with respect to the magnets 10 and 11, which will be described later, is kept high.

  By inserting the Hall elements 8a and 8b into the reference holes 6c and 6d from the flexible printed board 7 side, terminals 8c respectively protruding from the substantially central portions of the opposite side surfaces of the Hall element 8a, one of which is shown in FIG. , 8d, 8e, and 8f are in contact with the land 7c provided on the flexible printed board 7 and soldered in that state, so that the Hall element 8a can be easily soldered to the flexible printed board 7 without the need to hold it under pressure. be able to. Similarly, in the Hall element 8b, the terminal is soldered by being press-fitted into the reference hole 6d, and the signal is transmitted to both Hall elements 8a and 8b through the land portions 7c and 7d of the flexible printed board 7 through the lead portion 7e. And power supply.

  When the Hall elements 8a and 8b are press-inserted into the reference holes 6c and 6d and their terminals are soldered to the flexible printed board 7, the end face 8g on the magnetic detection side of the Hall elements 8a and 8b is the flexible printed board 7. It is in a state of protruding from the surface.

  9a and 9b are substantially U-shaped yokes. The yokes 9a and 9b are substantially flat plate-shaped stepped magnets having thick portions 10a and 11a and thin portions 10b and 11b, respectively. The yokes 9a and 9b having the magnets 10 and 11 have an end face 8g where the thick part 10a of the magnet 10 faces the coil 6a and the thin part 10b protrudes from the hall element 8a. And the thick part 11a of the magnet 11 is attached to the fixed frame 5 so as to face the coil 6b and the thin part 11b to face the projecting end face of the hall element 8b.

  Thereby, the interval between the magnets 10 and 11 and the coils 6a and 6b can be set so that the thrust generated in the coils 6a and 6b by the magnetic force of the magnets 10 and 11 can be optimized, and the magnet 10 is independent of the thrust. By setting the thicknesses of the thin portions 10b, 11b of 11 in advance, the distance between the magnets 10, 11 and the Hall elements 8a, 8b is optimized according to the magnetic sensitivity characteristics of the Hall elements 8a, 8b. Can be set.

  That is, in the case of a simple plate-shaped magnet not provided with the thin portions 10b and 11b, when trying to optimize the space between the Hall element and the magnet, the Hall element protrudes, and therefore, between the magnet and the coil. The distance between the Hall element and the magnet becomes too close or in contact with each other, and stable operation is achieved. Not done. For this reason, a Hall element for detecting the position of the image blur correction lens 1 and a magnet are provided independently.

  In that respect, as described above, by providing the magnet with the thin portions 10b and 11b, the distance between the magnet 10 (11) and the coil 6a (6b) and the magnet 10 (11) and the Hall element 8a (8b) Can be optimized, for example, the magnet 10 (11) and the coil 6a (to optimize the distance between the magnet 10 (11) and the Hall element 8a (8b). This can be improved as compared with the case where the distance to 6b) increases and the thrust as the actuator decreases.

  In addition, since the distance between the magnet 10 (11) and the coil 6a (6b) is large and sufficient thrust cannot be obtained, the coil and the magnet are enlarged, and the coil is larger than the actuator designed to increase the thrust. Therefore, the image blur correction apparatus can be reduced in size and thickness in combination with the use of one magnet for both actuator and position detection.

  In the above configuration, even if the coil moves together with the pitch frame 2, the inner diameter of the coil does not face the thin part of the magnet, that is, the thrust as an actuator is not rapidly reduced by forming the thin part. It is desirable to do.

  In the above embodiment, two coils are provided on the pitch frame side to which the image blur correction lens is attached, and the actuator is configured by two magnets facing each coil, and the pitch frame is vertically moved by one actuator. The other actuator moves the yaw frame to the left and right together with the pitch frame. However, the pitch frame can also be moved by moving the yaw frame to the left and right by providing the coil of the other actuator on the yaw frame. Even if it is configured to be moved, the same applies.

  In addition, the apparatus of the present invention may be employed in only one of the two actuator units that move the image blur correction lens up and down and left and right, and the other actuator may be an actuator having another configuration.

  The present invention is an image blur correction device that has a small number of parts and can be reduced in thickness and size, and is optimal not only for video movies but also for digital cameras and other imaging devices.

The internal perspective view of the camera provided with the image blur correction apparatus which concerns on embodiment of this invention 1 is a partially exploded perspective view of an image blur correction apparatus according to an embodiment of the present invention. The rear view of the movement frame part of the image blurring correction apparatus which concerns on embodiment of this invention Sectional drawing of the ZZ line in FIG. Hall element perspective view An exploded perspective view of a conventional image blur correction device Sectional view of line Y in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image blur correction lens 2 Pitch frame 4 Yaw frame 5 Fixed frame 6 Laminated substrate 6a, 6b Coil 6c, 6d Reference hole 7 Flexible printed board 8a, 8b Hall element (magnetic detection sensor)
10, 11 Magnet 10a, 11a Thick part 10b, 11b Thin part

Claims (1)

An image blur correction apparatus for controlling movement of an image blur correction lens in two directions in a vertical plane with respect to an optical axis, holding the image blur correction lens, and moving in a first direction in the vertical plane A first moving frame, a second moving frame that supports the first moving frame so as to be movable and moves with the first moving frame in a second direction within the vertical plane, and the second moving frame. A fixed frame that movably supports the movable frame in a second direction within the vertical plane, and a coil that is attached to the first movable frame and / or the second movable frame and drives the movable frame, A magnetic detection sensor for position detection attached to the first moving frame and / or the second moving frame including the coil, and a yoke on the fixed frame so as to face the coil and the magnetic detection sensor An attached magnet, said magnet having a thick part and Has a thin portion, the wall thickness portion is opposed to the coil, an image blur correction apparatus which is characterized in that is opposed to the thin portion in the magnetic sensor.

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