JP2006337918A - Lens driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving device capable of efficiently rotating a rotor by restraining leakage flux to be small in the stator of a motor. <P>SOLUTION: The lens driving device 1 is equipped with a lens holder 2 holding a lens 10, and a hollow motor 4. The motor 4 comprises the cylindrical rotor 18 having different magnetic poles alternately continuously in its peripheral direction, and the stator 17 arranged on the outer circumference of the rotor 18. The stator 17 comprises claw members 11, 12, 13 and 14 composed of magnetic material where a plurality of toothed claws 11a, 12a, 13a and 14a are formed at prescribed pitches, and energizing coils 20 and 22 wound round the claw members, and is housed in nearly hermetically enclosed state in the case 6 made of metal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens driving device for moving a lens along an optical axis direction.

Various types of lens driving devices for moving a lens along the optical axis direction have been known. For example, Patent Document 1 discloses a lens driving device that uses a hollow stepping motor. The stepping motor in this lens driving device includes a first coil portion and a second coil portion wound along the outer periphery of a rotor to be driven to rotate, and the first and second coil portions are vertically moved. The stator is configured by being laminated.
Utility model registration No. 3103297

  By the way, when the lens driving device having the above-described configuration is used for a camera-equipped mobile phone or the like, it is required to keep the power consumption of the motor as small as possible. For this purpose, in the above configuration, it is necessary to reduce the leakage magnetic flux of the stator and efficiently rotate the rotor.

  The present invention has been made in view of this point, and an object of the present invention is to provide a lens driving device capable of efficiently rotating a rotor while suppressing a leakage magnetic flux in a stator of a motor to a small amount.

  The lens driving device of the present invention includes a lens holder that holds a lens and a hollow motor, and the lens holder moves along the optical axis direction when the motor rotates. The motor includes a cylindrical rotor having magnetic poles that are alternately different in the circumferential direction, and a stator disposed on the outer periphery of the rotor, and the stator has a plurality of tooth-shaped claws arranged at a predetermined pitch. The claw member is made of a magnetic material formed by the above-described method, and a current-carrying coil wound around the claw member is housed in a metal case.

  According to this configuration, the stator that forms the magnetic circuit is housed in the metal case in a substantially hermetically sealed state, so that the rotor can be efficiently rotated while suppressing the leakage magnetic flux in the stator.

  In the lens driving device according to the aspect of the invention, it is preferable that the case has an extending portion that extends toward the inner peripheral side of the rotor.

  In the lens driving device according to the present invention, the case has an upper case and a lower case that are arranged vertically opposite to each other along the optical axis direction, and the stator has one claw in the circumferential direction. / 4 having a first and a second stator portion arranged at a pitch shift, the upper case is provided with a first housing portion for housing the first stator portion, and the lower case is provided with the above-mentioned It is preferable that the 2nd accommodating part which accommodates a 2nd stator part is provided.

  In the lens driving device of the present invention, the extending portion is formed in the upper case, and is formed in the upper extending portion extending from the upper side to the inner peripheral side of the rotor, and in the lower case. It is preferable to have a lower extension part extending from the inner side to the inner circumference side of the rotor.

  In the lens driving device of the present invention, the upper case and the lower case have opening ends facing each other, and the opening end of the lower case is overlapped on the opening end of the upper case. It is preferable that a polymerized portion to be connected together is formed.

  In the lens driving device of the present invention, the overlapping portion is formed by an overhanging portion that protrudes to the outside of the upper case and can be locked to a predetermined mounting member, and the protruding portion is locked to the mounting member. Preferably, the upper case and the lower case are kept connected, and the upper case and the lower case are integrally fixed to each other.

  In the lens driving device of the present invention, it is preferable that the claw member is directly supported by the case.

  In the lens driving device of the present invention, it is preferable that the case is provided with a positioning portion for positioning the claw member.

  According to the present invention, since the stator forming the magnetic circuit is accommodated in the metal case in a substantially hermetically sealed state, it is possible to efficiently rotate the rotor while suppressing the leakage magnetic flux in the stator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1-3 is a figure which shows the whole structure of the lens drive device 1 which concerns on one embodiment of this invention. 1 is a perspective view of the lens driving device 1, FIG. 2 is a longitudinal sectional view of the lens driving device 1, and FIG. 3 is an exploded perspective view of the lens driving device 1.

  As shown in these drawings, the lens driving device 1 holds the lens 4, the hollow motor 4 that holds the lens holder 2 so as to be movable along the optical axis O direction, and the motor 4 together with the lens holder 2. And a case 6 made of a magnetic metal to be housed. In the present embodiment, the motor 4 constitutes a so-called PM type two-phase claw pole stepping motor, as will be described later.

  The lens holder 2 accommodates a lens barrel 3 that holds a lens barrel 10A in which required lenses 10 are arranged along the optical axis direction, and moves in the optical axis direction integrally with the lens barrel 3. And a cylindrical carrier 5. In this case, the carrier 5 is integrally fixed to the lens barrel 3 by screwing. Specifically, one lens holder 2 is formed by screwing a female screw 5 a formed on the inner peripheral surface of the carrier 5 and a male screw 3 a formed on the outer peripheral surface of the lens barrel 3. It has become.

  The motor 4 includes a cylindrical rotor (rotor) 18 that can rotate around the optical axis O, and a stator (stator) 17 that is disposed concentrically on the outer periphery of the rotor 4.

  The rotor 18 includes a cylindrical permanent magnet 9 and a cylindrical cam member 7 disposed concentrically inside the permanent magnet 9. The cam member 7 is bonded and fixed to the inner peripheral surface of the permanent magnet 9, and a female screw 7 a formed on the inner peripheral surface is screwed with a male screw 5 b formed on the outer peripheral surface of the carrier 5. Further, on the outer periphery of the permanent magnet 9, N poles and S poles are alternately magnetized at equal pitches by a predetermined number of pairs.

  On the other hand, the stator 17 is disposed concentrically around the permanent magnet 9 and is stacked on the top and bottom of the first stator portion (one-phase side stator) 17a and the second stator portion with the spacer 19 interposed therebetween. (Two-phase side stator) 17b.

  The first stator portion 17a is wound around a ring-shaped upper claw member 11, a ring-shaped lower claw member 12, and a bobbin formed by vertically facing these claw members 11 and 12. An annular magnet coil 20.

  The upper and lower claw members 11 and 12 are made of an annular magnetic metal, and a plurality (ten in this embodiment) of claws (tooth portions) 11a, which are arranged at an equal pitch along the inner periphery thereof. 12a. The claws 11a and 11b extend substantially perpendicular to the annular main surface of the claw members 11 and 12, and are formed by bending 90 ° from the main surface. The S pole is opposed to the outer peripheral surface of the permanent magnet 9 magnetized alternately with a predetermined gap. Further, the claw 11a of the upper claw member 11 (a claw group composed of ten claws 11a) is, as clearly shown in FIG. 4, a claw 12a of the lower claw member 12 (comprised of ten claws 12a). The claw group is arranged with a 1/2 pitch shift in the circumferential direction so as to alternately mesh with the claw 12a.

  The magnet coil 20 wound around the bobbin formed by the upper and lower claw members 11 and 12 is formed by bundling conductive wires in an annular shape, and the claw members 11 and 12 meshed with each other. Of the claw groups 11a and 12a.

  On the other hand, like the first stator portion 17 a, the second stator portion 17 b is also formed by the ring-shaped upper claw member 13, the ring-shaped lower claw member 14, and these claw members 13, 14. And an annular magnet coil 22 wound around the bobbin.

  The upper and lower claw members 13 and 14 are formed of an annular magnetic body, and a plurality (ten in the present embodiment) of claws (tooth portions) 13a, which are arranged at an equal pitch along the inner periphery thereof. 14a. These claws 13a and 14b extend substantially perpendicular to the annular main surface of the claw members 13 and 14, and are formed, for example, by bending 90 ° from the main surface, The S pole is opposed to the outer peripheral surface of the permanent magnet 9 magnetized alternately with a predetermined gap. Further, as shown in FIG. 5, the claw 13a of the upper claw member 13 (a claw group composed of ten claw 13a) is also composed of the claw 14a of the lower claw member 14 (comprised of ten claws 14a). The claw groups are arranged with a 1/2 pitch shift in the circumferential direction so as to alternately mesh with the claw groups 14a, and magnet coils 22 are arranged on the outer circumferences of the claw groups 13a and 14a. As clearly shown in FIG. 5, the claw groups 13a and 14a of the second stator portion 17b on the two-phase side are connected to the claw groups 11a and 12a of the first stator portion 17a on the one-phase side. On the other hand, they are arranged with a 1/4 pitch shift in the circumferential direction.

  Further, the case 6 that holds and accommodates the lens holder 2 and the motor 4 configured as described above includes an upper case 6a and a lower case 6b. These upper and lower cases 6a are formed in a substantially U-shaped cross section, and the stator 17 and the rotor 18 are accommodated in a substantially sealed state by making the openings face each other and overlapping each other vertically. A storage space (storage portion) S is formed in cooperation with the lens holder 2.

  Specifically, as shown in FIG. 2, the upper case 6a covers the outer side wall 30 that surrounds the entire outer periphery of the first stator portion 17a, the first stator portion 17a, and the rotor 2 from above. An inner wall portion 32 that surrounds the upper wall portion 31 and the inner upper portion of the rotor 2 over the entire circumference and is interposed between the carrier 5 and the cam member 7 (an upper extending portion that extends toward the inner peripheral side of the rotor 2). The first housing portion S1 for directly supporting and housing the first stator portion 17a and a part (upper half) of the rotor 18 by these wall portions 30, 31, and 32 is provided. Forming. In this case, one surface 32a of the inner wall portion 32 facing the carrier 5 functions as a first guide surface that guides movement (described later) along the optical axis O of the lens holder 2 (carrier 5) on the upper side. In addition, the surface 32b on the other side of the inner wall portion 32 facing the cam member 7 functions as a second guide surface that guides the rotation (described later) of the rotor 18 (cam member 7) on the upper side. ing. That is, the inner wall portion 32 functions as a guide member that is integral with the case 6 a and guides the upper outer peripheral surface of the lens holder 2 and the upper inner peripheral surface of the rotor 18. Further, the outer wall portion 30 and the upper wall portion 31 function as support surfaces that directly support the claw members 11 and 12.

  On the other hand, the lower case 6b includes an outer wall portion 33 that surrounds the entire outer periphery of the second stator portion 17b, a bottom wall portion 34 that covers the second stator portion 17a and the rotor 2 from below, and the rotor 2 These include an inner wall portion 35 (a lower extending portion extending toward the inner peripheral side of the rotor 2) that surrounds the inner lower portion over the entire circumference and is interposed between the carrier 5 and the cam member 7. The wall portions 33, 34, and 35 form a second accommodating portion S2 for directly supporting and accommodating the second stator portion 17b and a part (lower half) of the rotor 18. In this case, one surface 35a of the inner wall 35 facing the carrier 5 functions as a third guide surface that guides the movement along the optical axis O of the lens holder 2 (carrier 5) on the lower side, The other surface 35b of the inner wall portion 35 facing the cam member 7 functions as a fourth guide surface that guides the rotation (described later) of the rotor 18 (cam member 7) on the lower side. . That is, the inner wall portion 35 functions as a guide member that is integrated with the case 6 b and guides the lower outer peripheral surface of the lens holder 2 and the lower inner peripheral surface of the rotor 18. Further, the outer wall portion 33 and the bottom wall portion 34 function as support surfaces that directly support the claw members 13 and 14.

  Note that the upper end surface 35 c of the inner wall portion 35 abuts on the lower end surface of the cam member 7 of the rotor 18 that receives a biasing force in the lower direction of a leaf spring 30 described later via the lens holder 2. Displacement in the downward direction is regulated.

  Further, the opening end portion of the upper case 6a, that is, the lower end portion of the outer wall portion 30, forms an overhanging portion 39 that projects outward in the radial direction, thereby forming the opening end portion of the lower case 6b, that is, the outer wall portion 33. The upper end portion can be received in a fitted state. That is, the overhanging portion 39 forms an overlapping portion that connects the opening end portions of the lower case 6b so as to overlap each other. The overhanging portion 39 is engaged with an attachment member (not shown) (for example, it may be a part of a member to which the lens driving device 1 is attached) so that the upper case 6a and the lower case 6b are fitted. The upper case 6a and the lower case 6b are fixed integrally with each other.

  As shown in FIGS. 1 to 3 and 5, the upper case 6 a and the lower case 6 b are opposed to a connector 60 which will be described later, and the ends of the conductive wires of the magnet coils 20 and 22 are led out. Lead-out ports 36 and 37 are formed in the outer wall portions 30 and 33, respectively. These lead-out port portions 36 and 37 are adapted to engage with projecting portions 12b and 13b formed on the outer peripheral edges of the claw members 12 and 13, and the claw members 12 and 13 and the claw members combined therewith. It also functions as a positioning part for positioning 11 and 14 with respect to the case 6.

  As clearly shown in FIGS. 1 and 2, a leaf spring (plate spring) 30 for urging the lens holder 2 along the optical axis O direction is disposed on the upper wall portion 31 of the upper case 6a. ing. Specifically, as shown in FIG. 6, the leaf spring 30 includes an outer ring portion 30 a attached and fixed to the upper wall portion 31 of the upper case 6 a and an inner ring portion attached and fixed to the carrier 5 of the lens holder 2. 30b, and a plurality of elastic arm portions 30c that connect the outer ring portion 30a and the inner ring portion 30b. In the present embodiment, three elastic arm portions 30c are provided between the outer ring portion 30a and the inner ring portion 30b. Each of the elastic arm portions 30c extends along the circumferential direction and has an equal angular interval in the circumferential direction. Is arranged. In the state of FIG. 1 in which the lens holder 2 is almost completely housed in the case 6, these elastic arm portions 30 c are not attached to the outer ring as clearly shown in FIG. The lens holder 2 moves along the optical axis direction with respect to the case 6a (the state shown in FIG. 2), and accordingly, the case 6a and the lens holder 2 move to the case 30a and the inner ring portion 30b. When the fixed outer ring portion 30a and inner ring portion 30b are separated from each other in the optical axis direction, as shown in FIG. 7 (b), a tensile force is received from the inner ring portion 30b and from the surface of the outer ring portion 30a. A biasing force that rises upward and biases the lens holder 2 toward the lower case 6b is applied to the lens holder 2 by an elastic restoring force generated thereby. As a result, the female screw 7a of the cam member 7 is applied. To prevent looseness due to backlash between the male screw 5b of the carrier 5.

  Further, four protrusions 59 projecting radially inward are provided on the inner peripheral edge of the inner ring portion 30 b of the leaf spring 30. These protrusions 59 are spaced apart at equal angular intervals in the circumferential direction, and engage with four concave grooves 5 c formed corresponding to the upper edge of the carrier 5, whereby the lens holder accompanying the rotation of the rotor 18. The rotation of 2 is regulated.

  As shown in FIG. 8 and FIG. 9, the connector 60 described above positioned opposite to the outlet ports 36 and 37 of the upper case 6 a and the lower case 6 b has a terminal block 50. The terminal block 50 includes a horizontal platform portion 50a and a vertical platform portion 50b. The horizontal platform portion 50a is disposed on the lower side of the lower case 6b so as to extend substantially parallel to the bottom wall portion 34, and the vertical platform portion 50b. Is arranged so as to face the outlet ports 36 and 37.

  Four coil terminals 52 are fixed to the vertical platform 50b. In this case, one end side 52a of each coil terminal 52 extends perpendicularly to the vertical base 50b (and thus extends in the horizontal direction) and protrudes to the side, and the conductive wires of the corresponding magnet coils 20 and 22 The ends are wound and soldered (electrically connected). Further, the other end side 52b of each coil terminal 52 extends in parallel with the vertical base portion 50b (and thus extends in the vertical direction) and protrudes below the horizontal base portion 50a, and supplies current to the coils 20 and 22. It is electrically connected to a component (not shown).

  On the other hand, three sensor terminals 54 are erected on the horizontal platform 50a. In this case, one end side 54a of each sensor terminal 54 protrudes upward from the upper surface of the horizontal platform 50a, and a flexible printed wiring board (FPC) 65 extending from the optical sensor chip 44 disposed on the horizontal platform 50a. And is electrically connected. The other end side 54 b of each sensor terminal 54 is electrically connected to a detection-side component (not shown) that receives a detection signal from the optical sensor chip 44. The horizontal platform 50a is formed as a printed circuit board (PCB), and the optical sensor chip 44 and one end side 54a of each sensor terminal 54 are electrically connected by printed wiring on the printed circuit board instead of the flexible printed wiring board 65. May be connected.

  As shown in FIG. 2 or FIG. 9, the optical sensor chip 44 provided on the horizontal base 50a is disposed in the opening 38 formed in the bottom wall 34 of the lower case 6b and emits light thereof. The portion 44 a and the light receiving portion 44 b are configured to face the lower peripheral end surface 72 of the permanent magnet 9.

  In the present embodiment, the rotation of the permanent magnet 9 is restricted to less than one rotation in order to regulate the amount of movement of the lens holder 2 along the optical axis O direction within a predetermined range. Specifically, as clearly shown in FIG. 10, a pair of recesses 9b and 9c are provided on the lower peripheral end surface 72 of the permanent magnet 9 with a predetermined circumferential interval, and provided between these recesses 9b and 9c. The projected portion 9a is brought into contact with stoppers 62 and 64 projecting from the horizontal platform 50a, thereby restricting the rotation of the permanent magnet 9 to a predetermined range of less than one rotation.

  In the present embodiment, the bottom surface of the recesses 9b and 9c in the lower peripheral end surface 72 of the permanent magnet 9 is a reflective surface that can reflect the light from the light emitting portion 44a of the optical sensor chip 44 to the light receiving portion 44b. 69,70. Therefore, the optical sensor chip 44 can detect the permanent magnet 9 and generate a detection signal only when it faces the recesses 9b and 9c as the permanent magnet 9 (rotor 18) rotates. Accordingly, the rotational range of the rotor 18 can be set to a desired range by defining the concave portions 9b and 9c at predetermined positions and adjusting the circumferential length of the convex portions 9a contacting the stoppers 62 and 64 accordingly. At the same time, the rotation position (rotation amount) of the rotor 18 can be detected by the optical sensor chip 44 from the recesses 9b and 9c, and the rotation of the rotor 18 can be controlled.

Next, the operation of the lens driving device 1 configured as described above will be briefly described.
First, when the current I is alternately supplied in a predetermined manner (a well-known manner in a stepping motor) to the conductive wires of the magnet coils 20 and 22 through the coil terminal 52 of the connector 60 from the state of FIG. The claws 11a, 12a, 13a, and 14a of the claw members 11, 12, 13, and 14 are alternately magnetized, and as shown in FIG. 11, two magnetic circuits without causing leakage of magnetic flux in the sealed case 6 A and B are formed (a heteropolar magnetic field appears in the claw 11a, 12a or 13a, 14a). Therefore, the rotor 18 having the permanent magnet 9 rotates in a predetermined direction (in this example, clockwise as indicated by an arrow in FIG. 12) from the state of FIG. In this case, the first magnetic circuit A is formed between the outer wall portions 30 and 33 of the cases 6a and 6b and the claws 11a, 12a, 13a, and 14a of the claw members 11, 12, 13, and 14, and the case A second magnetic circuit B is formed between the outer wall portions 30 and 33 and the inner wall portions 32 and 35 of 6a and 6b (in FIG. 11, the direction of the lines of magnetic force under such excitation is indicated by arrows. Have been).

  When the rotor 18 rotates in this way, the lens holder 2 screwed with the rotor 18 via the screws 5b and 7a moves along the optical axis from the state of FIG. 1 to the state of FIGS. At this time, the rotation of the rotor 18 and the movement of the lens holder 2 are performed by the guide surfaces 32a and 32b on both sides of the inner wall portion 32 of the upper case 6a and the guide surfaces 35a and 35b on both sides of the inner wall portion 35 of the lower case 6b. Guided. Therefore, the lens holder 2 is smoothly moved without rattling.

  Further, as described above, the leaf spring 30 that urges the lens holder 2 along the optical axis O direction as the lens holder 2 moves in the optical axis O direction has the elastic arm portion 30c as described above. The urging force that rises upward from the surface of the portion 30a and urges the lens holder 2 toward the lower case 6b is applied to the lens holder 2 by the elastic restoring force generated thereby. Therefore, rattling due to backlash between the female screw 7a of the cam member 7 and the male screw 5b of the carrier 5 is prevented.

  Further, the rotor 18 that continues to rotate from the state shown in FIG. 12 (rotation start position of the rotor 18) rotates by the projection 9 a coming into contact with the second stopper 64 provided on the terminal block 50 of the connector 60. Stopped. That is, when the rotor 18 reaches the state of FIG. 14 through the state of FIG. 13 from the state of FIG. 12 where the convex part 9a contacts the first stopper 62 provided on the terminal block 50, the convex part 9a It abuts against the second stopper 64 and cannot be rotated any further. Further, this state (rotation end position of the rotor 18) is detected when the second reflecting surface 70 of the permanent magnet 9 constituting the rotor 18 faces the optical sensor chip 44, whereby the magnet coils 20, 22 are detected. The supply of the current I to the conductive wire is stopped.

  The principle is the same when the direction of supplying the current I is reversed and the rotor 18 is rotated in the opposite direction (therefore, the lens holder 2 is moved in the opposite direction (the direction in which the lens holder 2 is pulled into the case 6)). It is. That is, in the rotor 18 that continues to rotate from the state of FIG. 14 (rotation start position of the rotor 18), the convex portion 9a abuts on the first stopper 62 provided on the terminal block 50 of the connector 60 (state of FIG. 12). ) To stop the rotation. Further, this state (rotation end position of the rotor 18) is detected when the first reflecting surface 69 of the permanent magnet 9 constituting the rotor 18 faces the optical sensor chip 44, whereby the magnet coils 20, 22 are detected. The supply of the current I to the conductive wire is stopped.

  As described above, in the lens driving device 1 of the present embodiment, the stator 17 (17a, 17b) that forms the magnetic circuit is housed in the metal case 6 in a substantially sealed state. The rotor 18 can be efficiently rotated while suppressing the leakage magnetic flux.

  Further, in the present embodiment, the case 6 has extending portions 32 and 35 extending to the inner peripheral side of the rotor 18 (specifically, between the carrier 5 and the cam member 7). That is, not only the stator is simply covered from the outside to form a substantially sealed space, but also a portion of the case that forms the sealed space is embedded inside, so that the stator is confined in the narrow space. The magnetic flux density with respect to the magnetic pole generated in the claw can be sufficiently increased while suppressing the leakage magnetic flux in the claw, and the efficient rotation of the rotor 18 can be further promoted. In particular, in the present embodiment, the upper case 6 a is formed on the upper case 6 a and extends from the upper side to the inner peripheral side of the rotor 18, and is formed on the lower case 6 b. Since the extending portion is divided into the lower extending portion 35 extending to the peripheral side, the upper and lower two-phase magnetic circuits can be confined efficiently and effectively, and the loss of the magnetic circuit can be further suppressed.

  Further, in the present embodiment, the case 6 includes an upper case 6a and a lower case 6b that are vertically opposed to each other along the optical axis direction, and the stator 17 has a claw of 1 in the circumferential direction. 1st and 2nd stator part 17a, 17b arrange | positioned and shifted by / 4 pitch, The 1st accommodating part S1 which accommodates the 1st stator part 17a is provided in the upper case 6a, and the lower case 6b Is provided with a second housing portion S2 for housing the second stator portion 17b. Therefore, the assemblability of the stator 17 having the two-phase structure with respect to the case 6 can be improved.

  In the present embodiment, an overlapping portion 39 is formed at the opening end portion of the upper case 6a so as to overlap and connect the opening end portions of the lower case 6b. Therefore, the sealing property of the case 6 is enhanced, and the dustproof effect can be enhanced.

  Further, in the present embodiment, the overlapping portion 39 is formed by an overhanging portion that protrudes to the outside of the upper case 6a and can be locked to a predetermined mounting member, and the protruding portion is locked to the mounting member. The connected state of the upper case 6a and the lower case 6b is maintained, and the upper case 6a and the lower case 6b are fixed integrally with each other. Therefore, the upper case 6a and the lower case 6b can be attached and fixed with a simple configuration.

  In the present embodiment, the claw members 11, 12, 13, 14 are directly supported by the case 6. Therefore, the number of parts can be reduced and the structure can be simplified. In this regard, particularly in the present embodiment, the positioning portions 36 and 37 for positioning the claw members 11, 12, 13, and 14 are provided in the case 6, so that the claw members 11, 12, 13, 14 can be easily assembled.

  The present invention is not limited to the embodiment described above, and can be implemented with various modifications. For example, the shape, the number, and the like of each member in the present embodiment are exemplifications and are not limited thereto, and can be appropriately changed and implemented without departing from the scope of the object of the present invention.

1 is a perspective view of a lens driving device according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the lens drive device of FIG. It is a disassembled perspective view of the lens drive device of FIG. It is a fragmentary perspective view which shows the inside of the upper case where the magnet coil and the claw member are arrange | positioned. It is a longitudinal cross-sectional view which shows the state which removed the lens holder and the rotor from the state of FIG. It is a top view of the leaf spring provided in the lens drive device of FIG. (A) is a perspective view showing the form of the leaf spring of FIG. 6 in a state in which the lens holder is almost completely housed in the case, (b) is the lens holder moved along the optical axis direction with respect to the case It is a perspective view which shows the form of the leaf spring of FIG. 6 in a state. It is a perspective view of the connector provided in the lens drive device of FIG. It is a perspective view of the cutting state of the lens drive device near a connector. It is a perspective view of the rotor provided in the lens drive device of FIG. (A) is a fragmentary perspective view which shows the direction of the magnetic flux in the state excited by supplying an electric current to a magnet coil, (b) is a top view in the same excitation state as (a). It is a perspective view of the rotor and connector arrange | positioned in a rotation start position. FIG. 13 is a perspective view of the rotor and the connector in a state rotated by a predetermined angle from the state of FIG. 12. It is a perspective view of the rotor and connector arrange | positioned in a rotation termination position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Lens holder 4 Motor 6 Case 6a Upper case 6b Lower case 10 Lens 11, 12, 13, 14 Claw member 11a, 12a, 13a, 14a Claw 17 Stator 17a 1st stator part 17b 2nd stator Part 18 Rotor 20, 22 Magnet coil (coil)
32 Inner wall (upper extension)
35 Inner wall (lower extension)
36, 37 Outlet part (positioning part)
39 Overhang part (polymerization part)
O Optical axis S1 1st accommodating part S2 2nd accommodating part

Claims (8)

In a lens driving device that includes a lens holder that holds a lens, and a hollow motor, and the lens holder moves along the optical axis direction when the motor rotates.
The motor has a cylindrical rotor having different magnetic poles alternately and continuously in the circumferential direction, and a stator disposed on the outer periphery of the rotor,
The stator includes a claw member made of a magnetic material that forms a plurality of tooth-shaped clawes at a predetermined pitch, and a current-carrying coil wound around the claw member. A lens driving device which is housed.   The lens driving device according to claim 1, wherein the case has an extending portion that extends toward an inner peripheral side of the rotor.   The case has an upper case and a lower case that are arranged to face each other in the vertical direction along the optical axis direction, and the stator is arranged in such a manner that the claws are arranged with a ¼ pitch shift in the circumferential direction. And a first accommodating portion that accommodates the first stator portion in the upper case, and a second accommodating portion that accommodates the second stator portion in the lower case. The lens driving device according to claim 1, wherein two accommodating portions are provided.   The extending portion is formed in the upper case, and is formed in the upper extending portion extending from the upper side to the inner peripheral side of the rotor, and formed in the lower case and extending from the lower side to the inner peripheral side of the rotor. The lens driving device according to claim 3, further comprising a lower extending portion that protrudes.   The upper case and the lower case have opening end portions facing each other, and an overlapping portion is formed on the opening end portion of the upper case to overlap and connect the opening end portions of the lower case inside. The lens driving device according to claim 3, wherein the lens driving device is provided.   The overlapping portion is formed by an overhanging portion that protrudes to the outside of the upper case and can be locked to a predetermined mounting member, and the upper case and the lower case are formed by the protruding portion being locked to the mounting member. The lens driving device according to claim 5, wherein the upper case and the lower case are integrally fixed to each other.   The lens driving device according to claim 1, wherein the claw member is directly supported by the case.   The lens driving device according to claim 7, wherein the case is provided with a positioning portion for positioning the claw member.

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