JP5988783B2 - Lens driving device and method of manufacturing lens driving device - Google Patents

Description

  The present invention relates to a lens driving device mounted on a relatively small camera used in a mobile phone or the like. The present invention also relates to a method for manufacturing such a lens driving device.

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a movable body that holds the lens and moves in the optical axis direction of the lens, and a fixed body in which the movable body is housed A lens driving device including a driving mechanism for moving a movable body in the optical axis direction is known (for example, see Patent Document 1). In the lens driving device described in Patent Document 1, the movable body includes a lens barrel that holds a lens and a lens holder to which the lens barrel is fixed. The fixed body includes a cover that constitutes a subject side portion of the lens driving device, a base that constitutes a non-subject side portion of the lens driving device, and a yoke that is disposed between the cover and the base and covers the outer peripheral side of the driving mechanism. I have.

  An imaging unit having an imaging element is attached to the end surface on the side opposite to the subject of the lens driving device described in Patent Document 1. The cover and the base are formed with openings for allowing light from the subject side to pass toward the image sensor. In a camera in which the lens driving device described in Patent Document 1 is mounted, if a foreign object such as dust enters the image sensor side from the opening of the base, the foreign object may appear as a shadow in the photographed image. . Therefore, in the lens driving device described in Patent Document 1, a protrusion is formed on the subject side surface of the base so as to surround the periphery of the opening over the entire circumference.

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a movable body that holds the lens and moves in the optical axis direction, and a movable body that can move in the optical axis direction is held. A lens driving device is known that includes a fixed body that moves and a driving mechanism that moves the movable body in the optical axis direction (see, for example, Patent Document 2). The lens driving device described in Patent Document 2 includes a plate spring that connects the movable body and the fixed body on the subject side, and a plate spring that connects the movable body and the fixed body on the non-subject side. The drive mechanism includes a drive coil fixed to the movable body and a drive magnet fixed to the fixed body.

  In the lens driving device described in Patent Document 2, the movable body includes a sleeve that holds a lens holder to which a lens is fixed, and a binding pin around which an end of the driving coil is wound. The binding pin is fixed to the sleeve so as to protrude from the end surface of the sleeve opposite to the subject. The binding pin is soldered and connected to a leaf spring disposed on the side opposite to the subject. A power supply terminal is soldered and connected to the leaf spring arranged on the side opposite to the subject, and current is supplied to the drive coil via the power supply terminal and the leaf spring.

JP 2009-251517 A JP 2011-186277 A

  As described above, in the lens driving device described in Patent Document 1, since the protrusion is formed on the surface of the base on the subject side so as to surround the entire periphery of the opening, the imaging element extends from the opening of the base. It is possible to prevent foreign matters such as dust from entering the side. However, in the lens driving device in which the binding pin protruding from the end surface on the side opposite to the subject of the sleeve is soldered to the leaf spring as in the lens driving device described in Patent Document 2, the entire circumference of the opening is covered. If the protrusions are formed so as to surround them, the connection portion between the binding pin and the leaf spring and the protrusions may interfere with each other, which may hinder the movement of the movable body in the optical axis direction. If the amount of solder when soldering the binding pin and the leaf spring is managed, it is possible to prevent interference between the connecting portion of the binding pin and the leaf spring and the projection, but a small lens drive In the apparatus, since the amount of solder used is small, it is difficult to manage the amount of solder.

  Accordingly, an object of the present invention is to prevent foreign matters such as dust from entering the image pickup device side from the opening of the base member even when the binding pin protruding to the opposite side of the movable body is soldered to the leaf spring. An object of the present invention is to provide a lens driving device capable of appropriately driving a movable body in the optical axis direction.

In order to solve the above-described problems, the lens driving device of the present invention has a lens driving device in which an opening for allowing light from the subject side to pass toward an image pickup element disposed on the opposite subject side is formed on the opposite subject side. A movable body that holds the lens and is movable in the optical axis direction of the lens, a fixed body that holds the movable body so as to be movable in the optical axis direction, and a drive mechanism for driving the movable body in the optical axis direction And a leaf spring connecting the anti-subject side of the movable body and the fixed body, and the drive mechanism includes a drive coil attached to the movable body, and a drive magnet attached to the fixed body and disposed opposite to the drive coil. The movable body includes a binding pin that protrudes toward the non-subject side and around which the end of the driving coil is wound, the fixed body includes a base member in which an opening is formed, and the binding pin is Soldered and connected to leaf spring, base The wood, the apertures enclose the wall portion is formed, the wall portion is Tsu Tachinobo toward the object side surface is a surface on the object side of the base member to the object side, of the wall portion, tying pin and the leaf spring in the vicinity of the connection portion between the cutout portion which is cut out toward the opposite-to-object side is formed, the object side surface of the base member, on the outer peripheral side of the wall portion, the object side surrounds the notch to be the second wall portion is formed that Tachinobo, the second wall portion is characterized in that it is formed at a position avoiding a connection portion when viewed in the optical axis direction.

  In the lens driving device of the present invention, a wall portion is formed on the base member so as to surround the opening. Further, in the present invention, the notch is formed in the vicinity of the connecting portion of the wall portion between the binding pin and the leaf spring. However, the second portion so as to surround the notch portion on the outer peripheral side of the wall portion. A wall is formed. Therefore, in the present invention, foreign matter such as dust is prevented from entering from the opening of the base member to the image sensor side by the wall portion surrounding the opening and the second wall portion surrounding the notch formed in the wall portion. It becomes possible. In the present invention, a notch portion is formed in the vicinity of the connecting portion between the binding pin and the leaf spring of the wall portion formed so as to surround the opening of the base member, and the second wall portion has the optical axis. It is formed at a position that avoids the connecting portion when viewed from the direction. Therefore, in the present invention, even if the binding pin that protrudes toward the opposite side of the movable body is soldered to the leaf spring, the connection portion between the binding pin and the leaf spring interferes with the wall portion and the second wall portion. Can be prevented. Therefore, in the present invention, even if the binding pin that protrudes toward the opposite side of the movable body is soldered to the leaf spring, the movable body can be appropriately driven in the optical axis direction.

  In the present invention, it is preferable that the height of the second wall portion from the subject side surface is lower than the height of the wall portion from the subject side surface. If comprised in this way, it will become possible to prevent more reliably interference with the connection part of a binding pin and a leaf | plate spring, and a 2nd wall part.

  In the present invention, it is preferable that the inner side surface of the second wall portion is disposed inside the movable body with respect to the outer peripheral surface of the movable body when viewed from the optical axis direction. If comprised in this way, it will become possible to prevent foreign materials, such as dust which passed through the outer peripheral side of the movable body, from directly entering the inside of the second wall portion. Accordingly, it is possible to effectively prevent foreign matters such as dust from entering the image sensor side from the opening of the base member.

  In the present invention, it is preferable that the region surrounded by the second wall portion of the base member is recessed toward the opposite subject side rather than the subject side surface. In the present invention, it is preferable that a third wall portion whose height from the side surface of the subject is lower than the wall portion is formed in a part of the notch portion. If comprised in this way, it will become possible to accumulate foreign materials, such as dust, in the area | region enclosed by the 2nd wall part. Therefore, even if a foreign substance enters the inside of the second wall, it is possible to prevent foreign substances such as dust from entering the imaging element side from the opening of the base member.

  In the present invention, for example, the movable body includes two binding pins, and the notches are formed at two positions so as to sandwich the optical axis of the lens when viewed from the optical axis direction.

  In the present invention, the lens driving device includes a power feeding terminal for supplying a current to the driving coil, and the power feeding terminal supplies a current to the driving coil and a soldering portion fixed by soldering to the leaf spring. And a terminal portion connected to an external device for forming an outer peripheral wall that rises toward the subject side on the outer peripheral side portion of the base member, and the soldering portion is disposed in the vicinity of the outer peripheral wall In the vicinity of the soldered portion of the outer peripheral wall, it is preferable that a second cutout portion cut out toward the non-subject side is formed. If comprised in this way, it will become possible to approach a soldering iron easily to the part to which a soldering part and a leaf | plate spring are soldered using a 2nd notch part. Therefore, it is possible to more easily solder the leaf spring and the power supply terminal.

  The lens driving device of the present invention is, for example, a manufacturing method including a cleaning step of washing away foreign matter accumulated in a region surrounded by the second wall portion of the base member from the notch portion to the opening after the assembly of the lens driving device is completed. Manufactured. In the lens driving device manufactured by this manufacturing method, even if foreign matter such as dust enters inside the second wall during assembly of the lens driving device, the foreign matter can be washed away in the cleaning process. Therefore, in the lens driving device manufactured by this manufacturing method, even if foreign matter such as dust enters the inside of the second wall at the time of assembling the lens driving device, this foreign matter is washed away in the cleaning process, and the base member It is possible to prevent a problem such as foreign matter such as dust entering from the opening to the image sensor side.

  As described above, in the lens driving device of the present invention, even if the binding pin that protrudes toward the opposite side of the movable body is soldered to the leaf spring, foreign matter such as dust is transferred from the opening of the base member to the imaging element side. It becomes possible to prevent the penetration, and it is possible to appropriately drive the movable body in the optical axis direction. Further, in the lens driving device manufactured by the manufacturing method of the lens driving device of the present invention, even if foreign matter such as dust enters the inside of the second wall during assembly of the lens driving device, this foreign matter is removed in the cleaning process. Therefore, it is possible to prevent a problem that foreign matter such as dust enters from the opening of the base member to the image sensor side.

It is a perspective view of the lens drive device concerning an embodiment of the invention. It is sectional drawing of the EE cross section of FIG. It is a disassembled perspective view of the lens drive device shown in FIG. FIG. 4 is a perspective view of an assembled state of a base member, a leaf spring, a binding pin and a power supply terminal shown in FIG. 3. It is a top view of the assembly state of a base member, a leaf | plate spring, a binding pin, and a power feeding terminal which are shown in FIG. It is sectional drawing of the FF cross section of FIG. It is an expansion perspective view of the base member shown in FIG. (A) is an enlarged view of the G part of FIG. 5, (B) is an enlarged view of the H part of FIG. It is an expansion perspective view for demonstrating the 2nd wall part and 3rd wall part concerning other embodiment of this invention.

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

(Schematic configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of the lens driving device 1 shown in FIG. FIG. 4 is a perspective view of the assembled state of the base member 11, the leaf spring 6, the binding pin 9 and the power supply terminal 13 shown in FIG. 3. In the following description, as shown in FIG. 1 and the like, the three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. The X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. Also, the X1 direction side is the “right” side, the X2 direction side is the “left” side, the Y1 direction side is the “front” side, the Y2 direction side is the “rear (back)” side, the Z1 direction side is the “upper” side, The Z2 direction side is the “lower” side.

  The lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone, a drive recorder, a surveillance camera system, or the like, and is formed in a substantially quadrangular prism shape as a whole as shown in FIG. Has been. Specifically, the lens driving device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape. The four side surfaces of the lens driving device 1 are substantially parallel to the left-right direction or the front-rear direction.

  In this embodiment, the Z direction (vertical direction) is substantially coincident with the optical axis direction. In addition, in a camera equipped with the lens driving device 1 of the present embodiment, an imaging element (not shown) is arranged on the lower side, and a subject arranged on the upper side is photographed. That is, in this embodiment, the upper side (Z1 direction side) is the subject side (object side), and the lower side (Z2 direction side) is the anti-subject side (imaging element side, image side).

  As shown in FIGS. 1 and 2, the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in the optical axis direction, and a fixed body that holds the movable body 2 so as to be movable in the optical axis direction. 3 and a drive mechanism 4 for driving the movable body 2 in the optical axis direction. Moreover, the lens drive device 1 includes leaf springs 5 and 6 that connect the movable body 2 and the fixed body 3 as shown in FIGS. That is, the movable body 2 is movably held by the fixed body 3 via the leaf springs 5 and 6. In this embodiment, the leaf spring 5 is disposed on the upper end side of the movable body 2, and the leaf spring 6 is disposed on the lower end side of the movable body 2.

  The movable body 2 includes a sleeve 8 that holds a lens holder 7 to which a plurality of lenses are fixed, and two binding pins 9 for binding an end portion of a driving coil 20 that constitutes the driving mechanism 6 to be described later. (Refer to FIG. 4). The fixed body 3 includes a cover member 10 that constitutes the upper end portion of the side surface of the lens driving device 1, a base member 11 that constitutes the lower end portion of the side surface of the lens driving device 1 and the lower end surface of the lens driving device 1, and a plate And a spacer 12 to which a part of the spring 5 is fixed. A pair of power supply terminals 13 for supplying a current to a drive coil 20 (described later) that constitutes the drive mechanism 4 is fixed to the base member 11.

  The lens holder 7 is formed in a substantially cylindrical shape. A plurality of lenses are fixed on the inner peripheral side of the lens holder 7. The sleeve 8 is formed of, for example, a resin material and has a substantially cylindrical shape. Specifically, the sleeve 8 is formed in a substantially cylindrical shape in which the shape of the inner peripheral surface when viewed from the vertical direction is substantially circular, and the shape of the outer peripheral surface when viewed from the vertical direction is substantially rectangular. ing. The sleeve 8 holds the lens holder 7 on its inner peripheral side.

  The binding pin 9 is made of a conductive metal material. The binding pin 9 is fixed to a fixing hole formed on the lower end side of the sleeve 8. The two binding pins 9 are fixed to the corner portion at the right rear end of the sleeve 8 and the corner portion at the left front end. The lower end side of the binding pin 9 protrudes below the lower end of the sleeve 8. On the lower end side of the binding pin 9 that protrudes from the lower end of the sleeve 8, an end portion of a driving coil 20 that constitutes the driving mechanism 4 is wound.

  The cover member 10 is made of a magnetic metal material. Moreover, the cover member 10 is formed in the substantially square cylinder shape with the bottom which has the bottom part 10a and the cylinder part 10b. At the center of the bottom portion 10a disposed on the upper side, an opening 10c for allowing light from the subject side (upper side) to pass toward the image sensor is formed. The opening 10c is formed so as to penetrate the bottom 10a. The cover member 10 covers the outer peripheral side of the movable body 2 and the drive mechanism 4.

  The base member 11 is formed of an insulating resin material. The base member 11 is formed in a block shape having a substantially square shape when viewed from the optical axis direction. The base member 11 is attached to the lower end side of the cover member 10. A detailed configuration of the base member 11 will be described later.

  The spacer 12 is formed of, for example, a resin material and is formed in a substantially square flat block shape. The spacer 12 is formed in a frame shape, and a through hole is formed at the center thereof. The spacer 12 is fixed to the lower surface of the bottom 10 a of the cover member 10.

  The leaf spring 5 connects the annular movable body fixing portion fixed to the upper end side of the sleeve 8, the four fixed body fixing portions fixed to the spacer 12, and the movable body fixing portion and the fixed body fixing portion. 4 arms. The leaf spring 5 is fixed to the sleeve 8 and the spacer 12 so that the thickness direction and the vertical direction substantially coincide with each other, and connects the upper end side of the movable body 2 and the fixed body 3.

  The leaf spring 6 is composed of two spring pieces 15 that are electrically separated from each other. The leaf spring 6 connects the lower end side of the movable body 2 and the fixed body 3. The detailed configuration of the leaf spring 6 will be described later.

  The power supply terminal 13 is formed in a flat plate shape with a conductive metal material. The power supply terminal 13 is soldered to the spring piece 15 and fixed thereto, and an external device (not shown) for supplying current to the drive coil 20 from the outside, such as an external connector or an external board. And a base portion 13c that connects the soldering portion 13a and the terminal portion 13b. The base portion 13c is formed in an elongated and substantially rectangular shape. The soldering portion 13a is formed in a substantially rectangular shape, and protrudes from one end in the longitudinal direction of the base portion 13c to one of the directions orthogonal to the longitudinal direction of the base portion 13c. The terminal portion 13b is formed in a substantially rectangular shape, and protrudes from the other end in the longitudinal direction of the base portion 13c to the other in the direction orthogonal to the longitudinal direction of the base portion 13c.

  The drive mechanism 4 includes two drive coils 20 wound around the outer periphery of the sleeve 8 and drive magnets 21 arranged along each of the four side surfaces of the lens drive device 1. The two driving coils 20 are wound around the outer peripheral surface of the sleeve 8 with a predetermined interval in the vertical direction. In this embodiment, two conductive coils 20 are formed by winding a single conducting wire around the outer peripheral surface of the sleeve 8. One end side of the conducting wire constituting the drive coil 20 is wound around one of the two tying pins 9 and the other end side of the conducting wire is wound around the other tying pin 9. Has been. The drive magnet 21 is formed in a substantially rectangular flat plate shape. The driving magnet 21 is fixed to the inner side surface of the cylindrical portion 10 b of the cover member 10 so as to face the outer peripheral surface of the driving coil 20. Note that the cover member 10 of this embodiment functions as a yoke for forming a magnetic circuit.

(Configuration of base member and leaf spring)
FIG. 5 is a plan view of the assembled state of the base member 11, the leaf spring 6, the binding pin 9 and the power supply terminal 13 shown in FIG. 4. 6 is a cross-sectional view taken along the line FF in FIG. FIG. 7 is an enlarged perspective view of the base member 11 shown in FIG. FIG. 8A is an enlarged view of a G portion in FIG. 5, and FIG. 8B is an enlarged view of an H portion in FIG.

  As described above, the base member 11 is formed in a block shape having a substantially square shape when viewed from the optical axis direction. In the center of the base member 11, an opening 11a for allowing light from the subject side (upper side) to pass toward the image sensor is formed. That is, an opening 11 a for allowing light from the subject side to pass toward the image sensor is formed on the lower end side of the lens driving device 1. The opening 11 a is formed so as to penetrate the base member 11.

  A substantially annular wall portion 11c is formed on the upper surface (that is, the subject side surface (subject side surface)) 11b of the base member 11 so as to surround the opening 11a. At the four corners of the upper surface 11b, spring fixing portions 11d to which a below-described fixing body fixing portion 15b constituting the spring piece 15 is fixed are formed so as to protrude above the upper surface 11b. A positioning portion 11e for determining the reference position of the movable body 2 in the vertical direction is formed on the outer peripheral side of the wall portion 11c on the upper surface 11b so as to protrude above the upper surface 11b. An outer peripheral wall 11f that rises upward is formed on the outer peripheral portion of the upper surface 11b. In addition, the base member 11 is formed with two press-fit portions 11g to which the power supply terminal 13 is press-fit and fixed.

  The wall 11c is formed at the edge of the opening 11a so as to rise upward. The wall portion 11c is formed with a notch portion 11h that is notched downward. The notches 11h are formed at two locations so as to sandwich the optical axis L when viewed from the vertical direction. Specifically, the notches 11h are formed at two locations on the right rear side and the left front side of the wall portion 11c. A second wall portion 11j is formed on the upper surface 11b on the outer peripheral side of the wall portion 11c so as to surround the notch portion 11h. That is, the second wall portion 11j is formed on the upper surface 11b on the outer peripheral side of the notch portion 11h so as to surround the notch portion 11h. The second wall portion 11j is formed to rise upward. The height of the second wall portion 11j from the upper surface 11b is lower than the height of the wall portion 11c from the upper surface 11b.

  The 2nd wall part 11j is formed so that the shape when it sees from an up-down direction may become a substantially pentagon shape. The second wall portion 11j is formed to be connected to both ends of the notch portion 11h in the circumferential direction of the wall portion 11c. The inner side surface 11k of the second wall portion 11j is more than the outer peripheral surface of the sleeve 8 (that is, the outer peripheral surface of the movable body 2) as shown in FIGS. It is arranged inside the sleeve 8. That is, the inner surface 11k of the second wall portion 11j formed on the left front side of the base member 11 is disposed on the right side and the rear side of the outer peripheral surface of the sleeve 8, and is formed on the right rear side of the base member 11. The inner surface 11k of the two wall portions 11j is disposed on the left side and the front side of the outer peripheral surface of the sleeve 8. In addition, although the 2nd wall part 11j of this form is formed so that the shape when it sees from an up-down direction may become a substantially pentagonal shape, the shape when the 2nd wall part 11j is seen from an up-down direction. You may form so that it may become shapes other than substantially pentagonal shapes, such as quadrangle | tetragon shape, semicircle shape, or a kamaboko shape.

  A third wall portion 11m whose height from the upper surface 11b is lower than the wall portion 11c is formed in a part of the notch portion 11h. The 3rd wall part 11m is formed in the both ends side of the notch part 11h in the circumferential direction of the wall part 11c so that it may connect with the 2nd wall part 11j. The height of the third wall portion 11m from the upper surface 11b is equal to the height of the second wall portion 11j from the upper surface 11b. Further, the bottom surface 11n of the notch 11h formed between the third wall portions 11m is formed in the same plane as the top surface 11b.

  A region of the base member 11 surrounded by the second wall portion 11j (more specifically, a region surrounded by the second wall portion 11j and the third wall portion 11m) is depressed below the upper surface 11b. It is. That is, the bottom surface 11p of the region surrounded by the second wall portion 11j is disposed below the upper surface 11b.

  The upper surface of the spring fixing portion 11d is formed in a planar shape that is orthogonal to the vertical direction. The positioning portions 11e are formed at four locations with a substantially 90 ° pitch around the optical axis L. The upper surface of the positioning portion 11e is formed in a planar shape that is orthogonal to the vertical direction. In this embodiment, when the lower end surface of the sleeve 8 is in contact with the upper surface of the positioning portion 11e, the movable body 2 is at the reference position in the optical axis direction.

  The outer peripheral wall 11f is formed to have a substantially square frame shape when viewed from the optical axis direction. As shown in FIG. 2, the outer peripheral wall 11 f is disposed on the inner peripheral side of the lower end side portion of the cover member 10. The outer peripheral wall 11f includes two outer peripheral wall portions 11q parallel to the YZ plane formed by the Y direction and the Z direction, and two outer peripheries parallel to the ZX plane formed by the Z direction and the X direction. It is comprised from the wall part 11r.

  On the front end side of the outer peripheral wall portion 11q, a notch portion 11s is formed as a second notch portion in which a part of the outer peripheral wall portion 11q is notched downward in a predetermined range in the front-rear direction. . The cutout portion 11s is formed in a predetermined range from the front end of the outer peripheral wall portion 11q toward the rear side. On the rear end side of the outer peripheral wall portion 11q, a notch portion 11t is formed in which a part of the outer peripheral wall portion 11q is cut out downward in a predetermined range in the front-rear direction. The cutout portion 11t is formed in a predetermined range from the rear end of the outer peripheral wall portion 11q toward the front side. The notches 11s and 11t are formed such that their bottom surfaces are disposed below the top surface of the spring fixing portion 11d.

  The outer peripheral wall portion 11r disposed on the front side is formed with two cutout portions 11u in which a part of the outer peripheral wall portion 11r is cut out downward in a predetermined range in the left-right direction. The notch portion 11u is formed in a predetermined range from the position shifted inward in the left-right direction from the left and right ends of the outer peripheral wall portion 11f arranged on the front side toward the inner side in the left-right direction. The notch portion 11u is formed such that its bottom surface is disposed above the upper surface of the spring fixing portion 11d.

  The two press-fit portions 11g are formed on the rear side of the outer peripheral wall portion 11r so as to follow the outer peripheral wall portion 11r disposed on the front side. Further, the two press-fitting portions 11g are formed symmetrically with respect to the YZ plane that passes through the optical axis L. The press-fitting portion 11g is configured by a recess that is recessed downward from the upper surface of the spring fixing portion 11d, and a part of the press-fit portion 11g is a groove formed in a thin groove shape. A through-hole penetrating in the vertical direction is formed at the inner end in the left-right direction of the press-fit portion 11g.

  As shown in FIG. 4, the spring piece 15 includes a movable body fixing portion 15a fixed to the lower end side of the sleeve 8, two fixed body fixing portions 15b fixed to the base member 11, and a movable body fixing portion 15a. And two arm portions 15c that connect the fixed body fixing portion 15b. Further, the spring piece 15 includes a connection portion 15d to which the power supply terminal 13 is soldered and electrically connected. The spring piece 15 is fixed to the sleeve 8 and the base member 11 so that the thickness direction and the vertical direction substantially coincide with each other.

  The movable body fixing portion 15a is formed in a substantially arc shape. A pin connection portion 15e to which the binding pin 9 is soldered and connected is formed in the movable body fixing portion 15a. The fixed body fixing portion 15b is placed and fixed on the upper surface of the spring fixing portion 11d. The arm portion 15c is formed so that desired spring characteristics of the spring piece 15 can be obtained. Specifically, the arm portion 15c is elongated and is gently curved. The connecting portion 15d is formed in a substantially rectangular shape. This connection part 15d is formed so that it may connect with the fixed body fixing | fixed part 15b arrange | positioned at the front side.

  The pin connection portion 15e is connected to the lower end side of each of the binding pins 9 fixed to the right rear end corner portion and the left front end corner portion of the sleeve 8 by soldering. As shown in FIG. 5, the binding pin 9 is disposed in a region surrounded by the second wall portion 11j when viewed from the vertical direction. Further, the connection portion between the binding pin 9 and the pin connection portion 15e is also disposed in the region surrounded by the second wall portion 11j. That is, a notch portion 11h is formed in the vicinity of the connection portion between the binding pin 9 and the pin connection portion 15e on the wall portion 11c. Further, when viewed from the vertical direction, the second wall portion 11j is formed at a position avoiding the connection portion between the binding pin 9 and the pin connection portion 15e. In this embodiment, when the movable body 2 is at the reference position in the optical axis direction, the lower end of the binding pin 9 is below the upper end of the wall portion 11c as shown in FIG. At this time, the lower end of the binding pin 9 is above the upper end of the second wall portion 11j. In addition, the 2nd wall part 11j may be formed so that the lower end of the binding pin 9 may be arrange | positioned below the upper end of the 2nd wall part 11j.

  The power supply terminal 13 is press-fitted and fixed in each of the two press-fitting portions 11g. Specifically, the power feeding terminal 13 and the ZX plane are parallel to each other, and the soldering portion 13a is disposed on the outer side in the left-right direction, and the terminal portion 13b is disposed on the inner side in the left-right direction. The terminal 13 is press-fitted and fixed in the press-fitting portion 11g. The power supply terminal 13 is fixed to the press-fit portion 11g so that the soldering portion 13a is disposed on the upper side and the terminal portion 13b is disposed on the lower side. As shown in FIG. 1, the lower end side of the terminal portion 13 b is exposed to the outside on the front side of the lens driving device 1.

  The soldering portions 13 a are disposed at the right front corner and the left front corner of the base member 11. The connecting portion 15d is fixed by soldering to the lower end side of the rear surface of the soldering portion 13a in a state where the front end of the connecting portion 15d of the spring piece 15 is in contact with or slightly spaced. . As described above, the notch portion 11s is formed on the front end side of the outer peripheral wall portion 11q. That is, a notch 11s is formed in the vicinity of the connection portion between the soldering portion 13a and the connection portion 15d. In this embodiment, the soldering operation of the soldering part 13a and the connecting part 15d is performed using the notch part 11s. In the present embodiment, the fixing work 15b is fixed to the spring fixing part 11d using the notches 11s and 11t.

(Lens driving device manufacturing method)
In the manufacturing process of the lens driving device 1 configured as described above, foreign matter such as dust collected on the bottom surface 11p of the region surrounded by the second wall portion 11j of the base member 11 after the assembly of the lens driving device 1 is completed. A cleaning step is provided to wash away from the notch 11h to the opening 11a. In this cleaning process, the foreign matter accumulated on the bottom surface 11p during assembly of the lens driving device 1 is washed away from between the third wall portions 11m formed on both ends of the notch portion 11h in the circumferential direction of the wall portion 11c to the opening 11a. The foreign matter washed away to the opening 11a is discharged to the lower side of the lens driving device 1.

(Main effects of this form)
As described above, in this embodiment, the wall 11c is formed in the base member 11 so as to surround the opening 11a. In this embodiment, the notch 11h is formed in the wall 11c, but the second wall 11j is formed on the outer periphery of the notch 11h so as to surround the notch 11h. For this reason, in this embodiment, foreign matter such as dust enters the image sensor side from the opening 11a by the wall 11c surrounding the opening 11a and the second wall 11j surrounding the notch 11h formed in the wall 11c. Can be prevented.

  Further, in this embodiment, a notch portion 11h is formed in the vicinity of the connecting portion between the binding pin 9 and the spring piece 15 of the wall portion 11c, and the second wall portion when viewed from above and below. 11j is formed at a position avoiding the connecting portion between the binding pin 9 and the spring piece 15. Therefore, in this embodiment, even if the binding pin 9 protruding to the opposite side of the movable body 2 is soldered to the spring piece 15, the connecting portion between the binding pin 9 and the spring piece 15 is the wall portion 11c and the second portion. It is possible to prevent interference with the two wall portions 11j. Therefore, in this embodiment, even if the binding pin 9 that protrudes toward the opposite side of the movable body 2 is soldered to the spring piece 15, the movable body 2 can be appropriately driven in the optical axis direction. In this embodiment, since the height of the second wall portion 11j from the upper surface 11b is lower than the height of the wall portion 11c from the upper surface 11b, the connecting portion between the binding pin 9 and the spring piece 15 and the first It becomes possible to more reliably prevent interference with the two wall portions 11j.

  In this embodiment, the inner side surface 11k of the second wall portion 11j is disposed on the inner side of the sleeve 8 than the outer peripheral surface of the sleeve 8 when viewed from the vertical direction. Therefore, in this embodiment, foreign matter such as dust that has entered the lens driving device 1 from the opening 10c of the cover member 10 and has passed through the outer peripheral side of the sleeve 8 is prevented from directly entering the inside of the second wall portion 11j. It becomes possible to do. Therefore, in this embodiment, it is possible to more reliably prevent foreign matters such as dust from entering the imaging element side from the opening 11a of the base member 11.

  In this embodiment, the bottom surface 11p of the region surrounded by the second wall portion 11j is recessed below the top surface 11b. In the present embodiment, a third wall portion 11m having a height lower than the wall portion 11c from the upper surface 11b is formed in a part of the notch portion 11h. For this reason, in this embodiment, it is possible to collect foreign matters such as dust in the region surrounded by the second wall portion 11j and the third wall portion 11m. Therefore, even if a foreign substance enters the inside of the second wall portion 11j, it is possible to prevent foreign substances such as dust from entering the imaging element side from the opening 11a of the base member 11.

  In this embodiment, a notch 11s is formed in the vicinity of the connection portion between the soldering portion 13a and the connection portion 15d. Therefore, when performing the soldering operation between the soldering part 13a and the connection part 15d, the soldering iron is easily brought close to the connection part between the soldering part 13a and the connection part 15d using the notch part 11s. Is possible. Therefore, in this embodiment, it is possible to more easily solder the power supply terminal 13 and the spring piece 15.

  In this embodiment, in the manufacturing process of the lens driving device 1, after assembly of the lens driving device 1, foreign matter such as dust collected on the bottom surface 11 p of the region surrounded by the second wall portion 11 j of the base member 11 is cut out. A cleaning process is provided for washing from the portion 11h to the opening 11a. For this reason, in this embodiment, even when foreign matter such as dust enters the second wall portion 11j during assembly of the lens driving device 1, the foreign matter can be washed away in the cleaning process. Therefore, in this embodiment, even when foreign matter such as dust enters the second wall portion 11j during the assembly of the lens driving device 1, the foreign matter is washed away in the cleaning process, and imaging is performed from the opening 11a of the base member 11. It is possible to prevent a problem such as foreign matter such as dust entering the element side.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the embodiment described above, a chamfered portion 11w may be formed on the end surface of the third wall portion 11m on the second wall portion 11j side, as shown in FIG. 9A. In this case, in the cleaning process after the assembly of the lens driving device 1 is completed, the foreign matter accumulated on the bottom surface 11p easily flows out from between the third wall portions 11m to the opening 11a.

  Further, as shown in FIG. 9B, the inner surface of the third wall portion 11m formed on one end side of the notch portion 11h in the circumferential direction of the wall portion 11c and the second wall connected to the third wall portion 11m. The second wall portion 11j and the third wall portion 11m may be formed such that the inner side surface with the portion 11j is formed in a substantially arc shape when viewed from the up-down direction. In this case, in the cleaning process after the assembly of the lens driving device 1 is completed, the foreign matter accumulated on the bottom surface 11p is likely to flow out from the notch 11h to the opening 11a. In this case, as shown in FIG. 9B, it is preferable that the third wall portion 11m is not formed on the other end side of the notch portion 11h in the circumferential direction of the wall portion 11c. In this case, as shown in FIG. 9B, a chamfered portion 11w is preferably formed on the second wall portion 11j side of the end surface of the third wall portion 11m.

  In the form mentioned above, the 2nd wall part 11j is formed so that it may connect with the both ends of the notch part 11h in the circumferential direction of the wall part 11c. In addition, for example, the second wall portion 11j may be formed so as to be connected to the wall portion 11c on the outer side in the circumferential direction rather than both ends of the notch portion 11h in the circumferential direction of the wall portion 11c.

  In the embodiment described above, the height of the second wall portion 11j from the upper surface 11b is lower than the height of the wall portion 11c from the upper surface 11b, but the connection portion between the binding pin 9 and the spring piece 15 If the interference with the two wall portions 11j can be prevented, the height of the second wall portion 11j from the upper surface 11b may be the same as the height of the wall portion 11c from the upper surface 11b, or the upper surface. You may be higher than the height of the wall part 11c from 11b.

  In the embodiment described above, the bottom surface 11p of the region surrounded by the second wall portion 11j is disposed below the top surface 11b, but the bottom surface 11p may be disposed in the same plane as the top surface 11b. Further, it may be arranged above the upper surface 11b. Moreover, in the form mentioned above, although the 3rd wall part 11m is formed in the notch part 11h, the 3rd wall part 11m does not need to be formed in the notch part 11h.

  In the embodiment described above, the leaf spring 6 is constituted by the two spring pieces 15, but the leaf spring 6 may be constituted by three or more spring pieces that are electrically separated from each other. In this case, a predetermined number of binding pins 9 corresponding to the number of spring pieces are fixed to the sleeve 8. Moreover, in the form mentioned above, although the lens drive device 1 is formed so that the shape when seen from the optical axis direction is a substantially square shape, the lens drive device 1 is when seen from the optical axis direction. You may form so that a shape may become a substantially rectangular shape. The lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is a polygonal shape such as a substantially hexagonal shape, a circular shape, or an elliptical shape.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 4 Drive mechanism 6 Leaf spring 9 Binding pin 11 Base member 11a Opening 11b Upper surface (subject side)
11c Wall part 11f Outer peripheral wall 11h Notch part 11j 2nd wall part 11k Inner side surface 11m 3rd wall part 11s Notch part (2nd notch part)
13 Feeding terminal 13a Soldering part 13b Terminal part 20 Driving coil 21 Driving magnet L Optical axis Z Optical axis direction Z1 Subject side Z2 Anti-subject side

Claims (8)

A lens driving device in which an opening for allowing light from a subject side to pass toward an image pickup element disposed on the opposite subject side is formed on the opposite subject side,
A movable body that holds a lens and is movable in the optical axis direction of the lens, a fixed body that holds the movable body so as to be movable in the optical axis direction, and a drive for driving the movable body in the optical axis direction A mechanism and a leaf spring connecting the anti-subject side of the movable body and the fixed body,
The drive mechanism includes a drive coil attached to the movable body, and a drive magnet attached to the fixed body and disposed opposite to the drive coil.
The movable body includes a binding pin that protrudes toward the non-subject side and around which an end of the driving coil is wound,
The fixed body includes a base member in which the opening is formed,
The binding pin is soldered and connected to the leaf spring,
Wherein the base member, the opening enclose the wall portion is formed,
The wall portion is Tsu Tachinobo toward the object side from the object side surface is a surface on the object side of said base member,
In the vicinity of the connecting portion of the wall portion between the binding pin and the leaf spring, a notch portion that is notched toward the anti-subject side is formed,
Wherein the object side surface of the base member, the outer peripheral side of the wall, the second wall portion that Tachinobo to the object side is formed with surrounding the notch,
The lens driving device according to claim 1, wherein the second wall portion is formed at a position avoiding the connection portion when viewed from the optical axis direction.   The lens driving device according to claim 1, wherein a height of the second wall portion from the subject side surface is lower than a height of the wall portion from the subject side surface.   The inner surface of the second wall portion is disposed inside the movable body with respect to the outer peripheral surface of the movable body when viewed from the optical axis direction. Lens drive device.   4. The lens driving device according to claim 1, wherein an area surrounded by the second wall portion of the base member is recessed toward the opposite subject side with respect to the subject side surface. 5.   The lens according to any one of claims 1 to 4, wherein a third wall portion having a height from the side surface of the subject lower than the wall portion is formed in a part of the notch portion. Drive device. The movable body includes the two binding pins,
6. The lens driving device according to claim 1, wherein the notch is formed at two locations so as to sandwich the optical axis of the lens when viewed from the optical axis direction. . A power supply terminal for supplying current to the drive coil;
The power supply terminal includes a soldering portion fixed by soldering to the leaf spring, and a terminal portion connected to an external device for supplying a current to the driving coil,
An outer peripheral wall that rises toward the subject side is formed on the outer peripheral portion of the base member,
The soldering portion is disposed in the vicinity of the outer peripheral wall, and a second cutout portion that is notched toward the anti-subject side is formed in the outer peripheral wall in the vicinity of the soldering portion. The lens driving device according to claim 1, wherein the lens driving device is provided. A method for manufacturing a lens driving device according to any one of claims 1 to 7,
A lens driving device comprising: a cleaning step of washing away foreign matter accumulated in a region surrounded by the second wall portion of the base member from the notch portion to the opening after the assembly of the lens driving device is completed. Manufacturing method.

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