JP2010217665A - Lens driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deformation of a spring member that supports a lens holder between a housing and the spring member even when a shock of falling or the like is applied while adjusting variation of thrust generated in the lens holder. <P>SOLUTION: The lens driving device includes: a lens holder 3 holding a lens body; a moving mechanism having magnets 4a to 4d, a coil 5 and a yoke 6, and generating the thrust in the lens holder 3 by energizing the coil 5, to move the lens holder 3 in an optical axis direction; an upper leaf spring 8 attached to the housing of a device body and supporting the lens holder 3; and an adjusting plate 9 pressing a part of the upper leaf spring 8. The upper leaf spring 8 has an external fixed part 81 fixed to the housing, an internal fixed part 82 fixed to the lens holder 3, and an arm 83 coupling the external fixed part 81 and the internal fixed part 82. The adjusting plate 9 has adjusting pieces 92a to 92c adjusting a spring constant of the upper leaf spring 8 by pressing a part of the root of the arm 83 coupled with the external fixed part 81. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens driving device, and more particularly to a lens driving device suitable for an autofocus mechanism or the like in a digital camera.

  2. Description of the Related Art Conventionally, in a lens driving device used for an autofocus mechanism or the like in a digital camera, a lens holder that holds a lens body is supported by an annular leaf spring between the housing and a moving mechanism including a magnet, a coil, and a yoke. What is moved in the optical axis direction is known (see, for example, Patent Document 1). In this lens driving device, the position of the lens holder (that is, the position of the lens body) can be adjusted by controlling the thrust generated in the lens holder by changing the amount of current supplied to the coil. Yes. However, in this lens driving device, since the lens holder to be driven is supported only by the plate spring, when the plate thickness of the plate spring varies, the thrust generated in the lens holder varies. This may cause difficulty in properly adjusting the position of the lens holder.

  On the other hand, the spring is rotated to adjust the variation in the resonance frequency of the vibration system of the vibration target due to the variation in the weight of the vibration target (for example, the weight) or the variation in the dimensions of the spring supporting the vibration target. There has been proposed an electromagnetic actuator that changes the length to the pressing portion that presses the outer end of the spring against the base member, that is, the length of the movable portion of the outer end of the spring (see, for example, Patent Document 2). When applying the vibration system adjustment technique in the electromagnetic actuator to the lens driving device as described above, the variation in the thrust generated in the lens holder due to the variation in the plate thickness of the leaf spring is adjusted. The position of the holder can be adjusted appropriately.

JP 2006-284651 A Japanese Patent No. 3950043

  However, in the electromagnetic actuator as described above, since the outer end of the spring is completely fixed by the pressing portion in order to make the length of the movable part of the outer end of the spring constant, an impact such as a drop is applied. In some cases, the spring is easily deformed from the fixed portion.

  The present invention has been made in view of such a problem, and even when an impact such as dropping is applied while adjusting the variation in thrust generated in the lens holding body, the lens holding body and the housing An object of the present invention is to provide a lens driving device capable of preventing deformation of a spring member supported between the two.

  The lens driving device according to the present invention includes a lens holding body that holds the lens body, a magnet, a coil, and a yoke, and generates a thrust to the lens holding body by energizing the coil to move along the optical axis direction. A moving mechanism, a spring member that is attached to the housing of the apparatus main body and supports the lens holder, and an elastic member that presses a part of the spring member, the spring member being fixed to the housing An outer fixing portion, an inner fixing portion fixed to the lens holding body, and an arm portion connecting the outer fixing portion and the inner fixing portion, and the elastic member is provided on the outer fixing portion side. It has an adjustment piece which presses a part of base part of an arm part and adjusts the spring constant of the said spring member, It is characterized by the above-mentioned.

  According to the lens driving device, the spring constant of the spring member is pressed by pressing a part of the base portion of the arm portion that constitutes the spring member that supports the lens holding member with the housing by the adjustment piece of the elastic member. Since the thrust generated on the lens holder can be adjusted via a spring member by a part of the elastic member, the drop of the thrust generated on the lens holder can be adjusted while adjusting the variation of the thrust generated on the lens holder. Even when an impact such as the above is applied, it is possible to prevent deformation of the spring member that supports the lens holder with the housing.

  In the lens driving device, an adjustment region is provided in a part of a base portion of the arm portion, and a pressing position by the elastic portion in the adjustment region is determined according to a measurement result of thrust generated in the lens holder. Is preferred. In this case, since the pressing position in the adjustment area of the base portion of the arm portion is determined according to the measurement result of the thrust generated in the lens holder, various factors of variation in the thrust generated in the lens holder should be considered. Therefore, it is possible to efficiently adjust the thrust generated in the lens holder.

  In the lens driving device, it is preferable that the elastic member is disposed by overlapping the adjustment piece along the arm portion. In this case, since the adjustment piece is arranged so as to overlap along the arm portion, the adjustment piece can surely press the root portion of the arm portion. Compared with the case of pressing only at the position, it is possible to effectively adjust the variation in thrust generated in the lens holder. In addition, since the adjustment piece easily follows the movement of the arm, it can be released when an excessive force is applied, and even when an impact such as a drop is applied, the lens holder It is possible to effectively prevent the deformation of the spring member that supports the housing with the housing.

  In the lens driving device, it is preferable that the adjustment piece of the elastic member has a stronger elastic force than the spring member. In this case, since the adjustment piece has a stronger elastic force than the spring member, when the impact such as dropping is applied, the adjustment piece does not completely follow the spring member but deforms, and is effective for the spring member. Therefore, even when an impact such as dropping is applied, it is possible to effectively prevent deformation of the spring member that supports the lens holder with the housing.

  According to the present invention, the spring constant of the spring member is adjusted by pressing a part of the base portion of the arm portion constituting the spring member that supports the lens holding member with the housing by the adjustment piece of the elastic member. As a result, it is possible to adjust the thrust generated in the lens holder via the spring member by a part of the elastic member. Even when an impact is applied, it is possible to prevent deformation of the spring member that supports the lens holder with the housing.

It is a disassembled perspective view of the lens drive device which concerns on one embodiment of this invention. It is a perspective view of the adjustment board which the lens drive device concerning the above-mentioned embodiment has. It is a perspective view of the lens drive device concerning the above-mentioned embodiment. It is a top view of the state which removed the cover member from the lens drive device concerning the above-mentioned embodiment. It is a top view at the time of assembling | attaching the adjustment board from which the lens drive device which concerns on the said embodiment differs. It is a top view at the time of assembling | attaching the adjustment board from which the lens drive device which concerns on the said embodiment differs. It is a top view at the time of assembling | attaching the adjustment board from which the lens drive device which concerns on the said embodiment differs. It is a perspective view for demonstrating the lens drive device which has the upper plate spring spot-welded. It is an enlarged view of the spot welding part of the lens drive device which has an upper leaf | plate spring by which spot welding is carried out.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a lens driving device 1 according to an embodiment of the present invention. As shown in FIG. 1, a lens driving device 1 according to the present embodiment includes a base member 2 constituting a bottom surface portion of the device, a lens holder 3 as a lens holding body for holding a lens body (not shown), Magnets 4a to 4d, a coil 5 and a yoke 6 constituting a moving mechanism for moving the lens holder 3 in the optical axis direction, and a pair of springs that support the lens holder 3 on the base member 2 and the yoke 6 so as to be movable in the optical axis direction. A plate spring (lower plate spring 7, upper plate spring 8) as a member, an adjustment plate 9 as an elastic member for adjusting a spring constant (spring load) of the upper plate spring 8, and a base that accommodates these components And a cover member 10 fixed to the member 2.

  The base member 2 is formed of, for example, an insulating resin material, and is generally provided in a rectangular shape. A metal plate material (not shown) to which the end of the coil 5 is connected is insert-molded in the base member 2 with a part thereof exposed. In the vicinity of the center of the base member 2, a circular opening 21 is formed at a position corresponding to an image sensor (not shown). Further, at the four corners of the base member 2, engagement pieces 22 a to 22 d that are engaged with engagement recesses 103 a to 103 d of the cover member 10 described later are provided upright. The lower leaf spring 7 is sandwiched between the engagement piece 22a disposed on the diagonal line and the engagement piece 22c in the vicinity of the reinforcing plate 11 having substantially the same shape as an outer fixing portion 71 of the lower leaf spring 7 described later. A pair of projecting pieces 23a, 23b used for positioning is provided upright. The base member 2 constitutes a part of the housing of the lens driving device 1.

  The lens holder 3 is formed of, for example, an insulating resin material and is generally provided in a cylindrical shape. A screw groove is provided on the inner periphery of the lens holder 3 so that a lens body (not shown) can be screwed. On the outer periphery of the lens holder 3 having a generally octagonal shape, four holding pieces 31a to 31d that are fitted to the inner peripheral portion of the coil 5 and hold the coil 5 are provided (in FIG. 1, the holding piece 31c is Not shown). Positioning pieces 32a to 32d for positioning the upper leaf spring 8 are provided at the upper end of the lens holder 3 corresponding to these holding pieces 31a to 31d. These positioning pieces 32a to 32d are provided so as to protrude upward, and are configured to be engageable with a notch portion 82a of the upper leaf spring 8 described later. In addition, the lower end portion of the lens holder 3 is provided with a hook-shaped portion 33 protruding sideways. The hook-shaped portion 33 has a generally octagonal shape corresponding to the shape of the coil 5 to be described later, and supports the lower end portion of the coil 5 held by the holding pieces 31a to 31d. In addition, a plurality of protruding pieces (not shown) that can be engaged with a cutout portion 72a of the lower leaf spring 7 described later are provided on the lower surface of the hook-shaped portion 33.

  The magnets 4 a to 4 d each have a pair of parallel outer surface portions 41, inner surface portions 42, and slope portions 43 that connect the outer surface portions 41 and the inner surface portions 42, and are fixed to the four corner portions of the yoke 6. The In this case, the magnets 4a to 4d make the outer side surface portion 41 and the inclined surface portion 43 face the inner wall surfaces at the four corners of the yoke 6, and the inner side surface portion 42 is made a certain distance from the inner wall surfaces of the hanging wall surfaces 63a to 63d of the yoke 6 described later. It is fixed in a state where it is sandwiched and opposed. For example, the magnets 4a to 4d are fixed to the four corner portions of the yoke 6 by bonding the outer surface portion 41 and the slope portion 43 with an adhesive or the like.

  The coil 5 is generally bundled in an octagonal shape, and the inner peripheral portion thereof is held by the holding pieces 31 a to 31 d of the lens holder 3 described above. Since the holding pieces 31 a to 31 d are formed so as to protrude slightly in the radial direction from the outer peripheral surface of the lens holder 3, the coil 5 is connected to the outer peripheral surface of the lens holder 3 in a portion where these holding pieces 31 a to 31 d do not exist. And a certain distance apart. Thus, in the state hold | maintained at the lens holder 3, while the outer peripheral surface of the coil 5 is arrange | positioned facing the inner surface part 42 of magnet 4a-4d, the inner peripheral surface is the drooping wall surface 63a-63d of the yoke 6. Opposed to the inner wall surface.

  The yoke 6 is formed by machining a metal material and has a box shape opened to the lower side shown in FIG. Moreover, the yoke 6 is generally provided in an octagonal shape, and an octagonal opening 61 is provided in the center thereof. Engaging portions 62a to 62d that protrude slightly laterally and engage with the engaging pieces 22a to 22d of the base member 2 are provided at the lower ends of the four corners of the yoke 6 (in FIG. 62d is not shown). Further, hanging wall surfaces 63a to 63d are provided at positions corresponding to the four corner portions of the yoke 6 at the peripheral edge of the opening 61 (in FIG. 1, the hanging wall surfaces 63a and 63b are not shown). These hanging wall surfaces 63 a to 63 d are arranged between the outer peripheral surface of the lens holder 3 and the inner peripheral surface of the coil 5 in a state where the lens holder 3 is accommodated. Furthermore, holes 64 a and 64 b into which fixing pins 104 of the cover member 10 described later are inserted are provided at predetermined positions on the upper surface of the yoke 6. The yoke 6 constitutes a part of the housing of the lens driving device 1.

  The lower leaf spring 7 is made of, for example, a conductive material such as beryllium copper, and has an annular outer fixing portion 71 fixed to the base member 2 and an annular inner fixing portion 72 fixed to the lower end portion of the lens holder 3. And three arm portions 73 for connecting the outer fixing portion 71 and the inner fixing portion 72 to each other. Two holes 71 a are provided at predetermined positions of the outer fixing portion 71, and the lower leaf spring 7 is fixed to the base member 2 with the protruding pieces 23 a and 23 b of the base member 2 being inserted into these holes 71 a. . In addition, a plurality of notches 72a are provided at predetermined positions of the inner fixing portion 72, and the lower leaf spring 7 is in a state where the protruding pieces provided on the lower surface of the lens holder 3 are accommodated in these notches 72a. The lens holder 3 is fixed. The arm portion 73 extends along a circumferential direction from a predetermined position of the outer fixing portion 71 and is connected to the inner fixing portion 72. Moreover, the arm part 73 is bent so that an upper side part may be extended in the middle. For this reason, the inner fixing portion 72 is disposed at a position slightly above the outer fixing portion 71.

  Similar to the lower leaf spring 7, the upper leaf spring 8 is made of a conductive material such as beryllium copper, and has an annular outer fixing portion 81 fixed to the upper surface of the yoke 6 and an upper end portion of the lens holder 3. An annular inner fixing portion 82 to be fixed, and three arm portions 83 that connect the outer fixing portion 81 and the inner fixing portion 82 are provided. Two holes 81a are provided at predetermined positions of the outer fixing portion 81, and the upper leaf spring 8 is fixed to the yoke 6 with the fixing pins provided on the lower surface of the cover member 10 being inserted into these holes 81a. Yes. In addition, four cutout portions 82a are provided at predetermined positions of the inner fixing portion 82, and the upper leaf spring 8 is moved to the lens holder 3 in a state where the positioning pieces 32a to 32d of the lens holder 3 are accommodated in these cutout portions 82a. It is fixed to. The arm portion 83 extends in a circumferential direction from a predetermined position of the outer fixing portion 81 and is connected to the inner fixing portion 82. Moreover, the arm part 83 is bent so that the upper side part may be extended in the middle. For this reason, the inner fixing portion 82 is disposed at a position slightly above the outer fixing portion 81.

  The adjustment plate 9 is made of a metal material such as stainless steel and has substantially the same shape as the outer fixing portion 81 of the upper leaf spring 8. In addition, two holes 91 are provided at predetermined positions of the adjustment plate 9, and the adjustment plate 9 overlaps the upper leaf spring 8 with the fixing pins provided on the lower surface of the cover member 10 being inserted into these holes 91. And fixed to the yoke 6. As will be described in detail later, a part of the arm 83 of the upper leaf spring 8 is pressed to a predetermined position on the inner peripheral side of the adjustment plate 9 to adjust the spring constant (spring load) of the upper leaf spring 8. Three adjustment pieces 92a to 92c are provided. These adjustment pieces 92 a to 92 c function as a leaf spring that is overlapped with a part of the arm portion 83 of the upper leaf spring 8 and presses the portion. As will be described later in detail, these adjusting pieces 92a to 92c are provided so that the thrust generated in the lens holder 3 can be adjusted by adjusting the spring constant (spring load) of the upper leaf spring 8.

  The cover member 10 is formed by machining a metal material. The cover member 10 is generally provided in an octagonal shape, and a circular opening 101 is provided at the center thereof. Further, from the positions corresponding to the four corners of the cover member 10, engagement pieces 102a to 102d are provided to hang down. These engagement pieces 102a to 102d are provided with engagement recesses 103a to 103d (the engagement recesses 103c and 103d are not shown in FIG. 1) that engage with the engagement pieces 22a to 22d of the base member 2. Yes. In addition, at a predetermined position on the lower surface of the cover member 10, two fixing pins for fixing the upper leaf spring 8 and the adjustment plate 9 to the upper surface of the yoke 6 are provided.

  Here, the positional relationship between the adjustment plate 9 and the upper leaf spring 8 included in the lens driving device 1 according to the present embodiment will be described. FIG. 2 is a perspective view of the adjustment plate 9 and the upper leaf spring 8 included in the lens driving device 1 according to the present embodiment. As shown in FIG. 2, the adjustment plate 9 has substantially the same shape as the outer fixing portion 81 of the upper leaf spring 8 and is superimposed on the outer fixing portion 81. The adjustment pieces 92 a to 92 c provided on the inner peripheral side of the adjustment plate 9 are provided so as to protrude slightly inward from the inner peripheral portion of the adjustment plate 9 and to extend along the circumferential direction. Further, these adjustment pieces 92 a to 92 c are arranged in the vicinity of the root portion of each arm portion 83 in the outer fixing portion 81 of the upper leaf spring 8 and can press the portion.

  In the lens driving device 1 according to the present embodiment, the upper leaf spring 8 is made of beryllium copper having a thickness of 50 μm, and the adjustment plate 9 is made of stainless steel having a thickness of 50 μm. In this case, the adjustment plate 9 has an elastic force that is approximately twice that of the upper leaf spring 8. For this reason, in the manufacturing process, it is possible to adjust a thrust generated in a lens holder 3 to be described later. On the other hand, when an impact such as a drop is applied to the lens driving device 1, elastic deformation is performed together with the upper leaf spring 8. However, the upper leaf spring 8 can be protected.

  When assembling the lens driving device 1 having such a configuration, the lens holder 3 holding the coil 5 is fixed to the base member 2 via the lower leaf spring 7 and the reinforcing plate 11, while the lens holder The yoke 6 in which the magnets 4 a to 4 d are fixed to the inner walls of the four corner portions is fixed to the base member 2 so that 3 is disposed inside the opening 61. The upper leaf spring 8 is placed on the upper surfaces of the lens holder 3 and the yoke 6 so that the positioning pieces 32a to 32d of the lens holder 3 are accommodated by the notch 82a, and the adjustment plate is disposed above the upper leaf spring 8. 9 is placed. Thereafter, the fixing pin is inserted into the holes 66a to 66d of the yoke 6 through the holes 81a and 91 of the upper plate spring 8 and the adjusting plate 9, and the engaging recesses 103a to 103d are engaged with the engaging pieces 22a to 22d. The cover member 10 is fixed to the base member 2 as described above. Thereby, the assembly operation of the lens driving device 1 is completed, and the lens driving device 1 is completed.

  FIG. 3 is a perspective view of the lens driving device 1 in an assembled state. As shown in FIG. 3, in the assembled state as shown in FIG. 3, components such as the lens holder 3 and the coil 5 are housed inside the yoke 6, and from above the yoke 6, as shown in FIG. 3. A cover member 10 is covered. The lens holder 3 is fixed to the base member 5 by the lower plate spring 7 inside the opening 101 of the cover member 10, and is fixed to the yoke 6 by the upper plate spring 8, and the upper plate spring 8 and the lower plate are fixed. The spring 7 is held at the initial position by the biasing force (repulsive force) of the spring 7. A lens body (not shown) is screwed into the lens holder 3 from the upper side shown in FIG. 3 in a state where the rotation of the lens holder 3 is restricted by a dedicated jig or the like. The lens body assembled in the lens holder 3 is configured to be movable integrally with the lens holder 3.

  When a current is passed through the coil 5 held on the outer peripheral surface of the lens holder 3, the current flowing in the coil 5 acts on the magnetic field generated from the magnets 4a to 4d, thereby moving the coil 5 in the vertical direction shown in FIG. Thrust is generated. In the lens driving device 1 according to the present embodiment, for example, this thrust is changed by controlling the amount of current flowing through the coil 5 in accordance with a driving instruction from a control unit of a mobile phone or digital camera equipped with the device main body. The coil 5 is moved up and down and positioned. As a result, the position of the lens holder 3 that holds the coil 5 can be adjusted, and the position of the lens body assembled to the lens holder 3 can be adjusted.

  FIG. 4 is a top view of the lens driving device 1 with the cover member 10 removed. As shown in FIG. 4, the upper leaf spring 8 is disposed above the lens holder 3 in a state where the positioning pieces 32 a to 32 c are accommodated in the notch portion 82 a. The adjustment plate 9 is placed on the upper leaf spring 8 so that the adjustment pieces 92 a to 92 c are positioned in the vicinity of the root portion of the arm portion 83 of the upper leaf spring 8. In particular, the adjustment pieces 92 a to 92 c protrude slightly at a position closer to the inner fixing portion 82 than the root portion of the arm portion 83, and extend in the same direction (circumferential direction) as the extending direction of the arm portion 83. Thereby, adjustment piece 92a-92c is comprised so that it may be piled up in the fixed range of the base part of the arm part 83, and a pressing force may be provided.

  In the lens driving device 1 according to the present embodiment, a plurality of types of adjustment plates 9 for applying a pressing force to the arm portion 83 of the upper leaf spring 8 are prepared in this way, and the thickness of the upper leaf spring 8 varies. This corresponds to a variation in thrust generated in the lens holder 3 (coil 5) due to the above. Specifically, a plurality of types of adjustment plates 9 having different lengths of the adjustment pieces 92a to 92c are prepared, and the adjustment plate 9 is selected based on the measurement result of the thrust measured before the lens body is assembled. By incorporating the selected adjustment plate 9 into the lens driving device 1, the thrust of the lens holder 3 is adjusted through adjustment of the spring constant of the upper leaf spring 8.

  In addition, as a factor of the fluctuation | variation of the thrust which generate | occur | produces in the lens holder 3, in addition to the variation in the plate thickness of the upper leaf spring 8, the variation in the plate thickness of the lower leaf spring 7, the variation in the magnetic force of the magnets 4a to 4d, the yoke 6 Various factors such as variations in magnetic permeability and combinations thereof can be considered. In the lens driving device 1 according to the present embodiment, since the fluctuation of the thrust generated in the lens holder 3 that may occur as a result of these factors is dealt with, the thrust generated in the lens holder 3 can be adjusted appropriately, In addition, the position of the lens holder 3 can be adjusted.

  Hereinafter, the configuration of a plurality of types of adjustment plates 9 prepared by the lens driving device 1 according to the present embodiment will be described. 5-7 is a top view for demonstrating the structure of the multiple types of adjustment board 9 prepared with the lens drive device 1 which concerns on this Embodiment. 5 to 7 show a state in which the cover member 10 is removed from the lens driving device 1 in a state where various adjustment plates 9 are incorporated, as in FIG. For convenience of explanation, the adjustment plates 9 shown in FIGS. 5 to 7 are distinguished as adjustment plates 9a, 9b, and 9c, respectively.

  In the adjustment plate 9a shown in FIG. 5, adjustment pieces 92a to 92c are provided longer than the adjustment plate 9 shown in FIG. That is, the adjustment pieces 92a to 92c of the adjustment plate 9a apply a pressing force to the vicinity of the root portion of the arm portion 83 of the upper leaf spring 8 in a range (long range) larger than the adjustment plate 9 shown in FIG. Yes. For this reason, the thrust generated in the lens holder 3 can be adjusted lower than the adjustment plate 9 shown in FIG. Therefore, when it is necessary to adjust the thrust generated in the lens holder 3 to be lower than that of the adjustment plate 9 shown in FIG. 4, the adjustment plate 9 a is selected and incorporated in the lens driving device 1.

  In the adjustment plate 9b shown in FIG. 6, adjustment pieces 92a to 92c are provided shorter than the adjustment plate 9 shown in FIG. That is, the adjustment pieces 92a to 92c of the adjustment plate 9b give a pressing force to the vicinity of the root portion of the arm portion 83 of the upper leaf spring 8 in a range (short range) smaller than the adjustment plate 9 shown in FIG. Yes. For this reason, the thrust generated in the lens holder 3 can be adjusted higher than the adjustment plate 9 shown in FIG. Therefore, when it is necessary to adjust the thrust generated in the lens holder 3 higher than the adjustment plate 9 shown in FIG. 4, the adjustment plate 9 b is selected and incorporated in the lens driving device 1.

  In the adjustment plate 9c shown in FIG. 7, the adjustment plate 9c which cut | disconnected the adjustment pieces 92a-92c provided in the adjustment plate 9 shown in FIG. 4 is shown. That is, in the adjustment plate 9 c, the adjustment pieces 92 a to 92 c do not exist, and no pressing force is applied to the vicinity of the root portion of the arm portion 83 of the upper leaf spring 8. For this reason, the thrust generated in the lens holder 3 can be adjusted higher than the adjustment plate 9 shown in FIG. Therefore, when it is necessary to adjust the thrust generated in the lens holder 3 higher than the adjustment plate 9 shown in FIG. 6 or when it is not necessary to adjust the thrust generated in the lens holder 3, the adjusting plate 9c is used. It is selected and incorporated into the lens driving device 1.

  In the lens driving device 1 according to the present embodiment, a plurality of types of adjustment plates 9 and 9a to 9c having different lengths of the adjustment pieces 92a to 92c are measured in the stage before the lens body is assembled. The selection is made based on the result, and the adjustment plate 9 selected is incorporated into the lens driving device 1 to adjust the thrust of the lens holder 3. As a result, the variation in thrust generated in the lens holder 3 that may occur as a result of various factors can be adjusted appropriately, and the position of the lens holder 3 can be adjusted appropriately.

  In particular, in the lens driving device 1 according to the present embodiment, an adjustment region is configured by a part of the base portion of the arm portion 83 corresponding to the adjustment pieces 92a to 92c of the adjustment plates 9 and 9a to 9c. By selecting the adjustment plates 9 and 9a to 9c according to the measurement result of the thrust generated in the holder 3, the pressing positions by the adjustment pieces 92a to 92c in this adjustment region are determined. For this reason, the thrust generated in the lens holder 3 can be adjusted efficiently without considering various factors of variation in the thrust generated in the lens holder 3.

  Further, in the lens driving device 1 according to the present embodiment, the material is selected so that the elastic force of the adjusting plates 9 and 9a to 9c is about twice that of the upper leaf spring 8. Thus, when an impact such as dropping is applied to the lens driving device 1 while adjusting the thrust generated in the lens holder 3 in the manufacturing process, the upper plate is elastically deformed together with the upper leaf spring 8. The spring 8 can be protected. For this reason, even when an impact such as a drop is applied to the lens driving device 1, the lower leaf spring 7 and the upper leaf spring 8 that support the lens holder 3 between the housing (the base member 2 and the yoke 6) are deformed. Can be prevented.

  By the way, like the lens driving device 1 according to the present embodiment, the adjustment of the thrust generated in the lens holder 3 is not limited to the adjustment pieces 92a to 92c, and can be realized by other configurations. . For example, the thrust generated in the lens holder 3 can be adjusted by shortening the length of the arm 83 of the upper leaf spring 8 that supports the lens holder 3 with the yoke 6 by spot welding to the yoke 6. It is.

  FIG. 8 is a perspective view for explaining the lens driving device 100 having the upper plate spring 8 to be spot-welded. FIG. 9 is an enlarged view of a spot welded portion of the lens driving device 100 having an upper leaf spring to be spot welded. The lens driving device 100 shown in FIGS. 8 and 9 has a different aspect from the lens driving device 1 according to the present embodiment, but the same reference numerals are given to the components common to the lens driving device 1. The description is omitted. Further, in the lens driving device 100 shown in FIGS. 8 and 9, the cover member 10 is omitted for convenience of explanation.

  In the lens driving device 100 shown in FIG. 8, components such as the lens holder 3 and the coil 5 are accommodated inside the yoke 6, and the upper leaf spring 8 is fixed between the upper end of the lens holder 3 and the yoke 6. This is common with the lens driving device 1 according to the present embodiment. However, in the lens driving device 100 shown in FIG. 8, the vicinity of the base portion of the arm portion 83 included in the upper leaf spring 8 is in a state of being arranged on the peripheral portion of the opening 61 of the yoke 6. This is different from the lens driving device 1 according to the present embodiment (see FIG. 9).

  In this lens driving device 100, as shown in FIG. 9, the thrust generated in the lens holder 3 is measured before the lens body is assembled, and on the peripheral portion of the opening 61 of the yoke 6 according to the measurement result. Spot welding is performed in the vicinity of the root portion of the arm portion 83 of the upper leaf spring 8 so that the length of the arm portion 83 is shortened and the thrust generated in the lens holder 3 is adjusted. For example, when it is desired to adjust the thrust generated in the lens holder 3 to the lowest, spot welding is performed at the welding point A shown in FIG. 9, and when the thrust generated in the lens holder 3 is to be adjusted slightly lower, Spot welding is performed at a welding point C shown in FIG.

  According to the lens driving device 1, the thrust generated in the lens holder 3 can be adjusted in the same manner as the lens driving device 1 according to the present embodiment. In particular, in this case, since the thrust generated in the lens holder 3 is adjusted by means of spot welding, it is not necessary to prepare a plurality of types of adjustment plates 9 having different lengths of the adjustment pieces 92a to 92c. Thus, the thrust generated in the lens holder 3 can be adjusted more easily. However, when adjusting the thrust generated in the lens holder 3 by spot welding in this way, the problem remains that the upper leaf spring 8 is easily deformed when an impact such as dropping is applied to the lens holder 1. As in the lens driving device 1 according to the present embodiment, it is preferable to adjust the thrust generated in the lens holder 3 using the adjusting plate 9 having the adjusting plates 92a to 92c having elasticity.

  As described above, in the lens driving device 1 according to the present embodiment, the upper leaf spring 8 that supports the lens holder 3 with the housing is configured by the adjustment pieces 92 a to 92 c of the adjustment plate 9. Since the spring constant of the upper leaf spring 8 is adjusted by pressing a part of the base portion of the arm portion 83, the thrust generated in the lens holder 3 via the upper leaf spring 8 by a portion of the adjustment plate 9 Therefore, even when an impact such as a drop is applied while adjusting the variation in the thrust generated in the lens holder 3, the upper leaf spring 8 that supports the lens holder 3 with the housing can be adjusted. Deformation can be prevented.

  In particular, in the lens driving device 1 according to the present embodiment, an adjustment region is provided in a part of the base portion of the arm portion 83, and the adjustment plates 9 and 9 a to 9 c according to the measurement result of the thrust generated in the lens holder 3. Since the pressing positions of the adjustment pieces 92a to 92c in the adjustment region can be determined by selecting the above, the lens holder can be efficiently handled without considering various factors of the variation in thrust generated in the lens holder 3. 3 can be adjusted.

  Further, in the lens driving device 1 according to the present embodiment, the adjustment pieces 92a to 92c are arranged so as to overlap with each other along the arm portion 83, so that the base portion of the arm portion 83 is surely secured by the adjustment pieces 92a to 92c. For example, it is possible to effectively adjust the variation in the thrust generated in the lens holder 3 as compared with the case where the pressing is performed only at the position of one point of the root portion of the arm portion 83. . Further, since the adjustment pieces 92a to 92c easily follow the movement of the arm portion 83, the force can be released when an excessive force is applied, and even when an impact such as a drop is applied. It is possible to effectively prevent deformation of the upper leaf spring 8 that supports the lens holder 3 with the housing.

  Further, in the lens driving device 1 according to the present embodiment, the elastic force of the adjustment pieces 92a to 92c is set to be stronger than that of the upper leaf spring 8, so that when an impact such as dropping is applied. Since the pressing force can be effectively applied to the upper leaf spring 8 rather than completely following the upper leaf spring 8, the lens holder 3 can be applied even when an impact such as dropping is applied. It is possible to effectively prevent deformation of the upper leaf spring 8 that supports the frame with the housing.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

DESCRIPTION OF SYMBOLS 1,100 Lens drive device 2 Base member 21 Opening part 22a-22d Engagement piece 23a, 23b Projection piece 3 Lens holder 31a-31d Holding piece 32a-32d Positioning piece 33 Gutter-like part 4a-4d Magnet 41 Outer side part 42 Inner side part 43 Slope 5 Coil 6 Yoke 61 Opening 62a-62d Engagement 63a-63d Hanging Wall 64a, 64b Hole 7 Lower Plate Spring 71 Outer Fixing 71a Hole 72 Inner Fixing 72a Hole 73 Arm 8 Upper Plate Spring 81 Outer Fixing part 81a hole 82 Inner fixing part 82a hole 83 Arm part 9 Adjustment plate 91 Hole 92a-92c Adjustment piece 10 Cover member 101 Opening part 102a-102d Engagement piece 103a-103d Engagement recessed part

Claims (4)

  A lens holding body that holds the lens body, a moving mechanism that includes a magnet, a coil, and a yoke, generates a thrust to the lens holding body by energizing the coil, and moves the lens holding body along the optical axis direction; A spring member that is attached to a body and supports the lens holding body, and an elastic member that presses a part of the spring member, wherein the spring member is fixed to the housing; An inner fixing portion that is fixed to the lens holding body; and an arm portion that connects the outer fixing portion and the inner fixing portion; and the elastic member is a part of a base portion of the arm portion on the outer fixing portion side. A lens driving device having an adjustment piece for adjusting the spring constant of the spring member by pressing.   2. An adjustment region is provided in a part of a base portion of the arm portion, and a pressing position by the elastic portion in the adjustment region is determined according to a measurement result of a thrust generated in the lens holder. Lens drive device.   3. The lens driving device according to claim 1, wherein the elastic member is arranged by overlapping the adjustment piece along the arm portion. 4.   The lens driving device according to claim 1, wherein the adjustment piece of the elastic member has a stronger elastic force than the spring member.

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