JP2009139941A - Lens drive device, and spring member bonding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency in bonding a spring member as a restricting means with a support body for supporting a moving body. <P>SOLUTION: The lens drive device 1 includes a moving body (a sleeve 13 or the like) which holds a lens and moves in an optical axis direction, and a support body (a holder 19 or the like) for supporting the moving body through the spring member. The support body includes the holder 19 having a spring mounting part 19d on which a support body side mounting part (a holder side mounting part 15c) of the spring member is mounted. The holder 19 includes a guide part (a hole 19a) for injecting adhesive between the support body side mounting part 15c and the spring mounting part 19d. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens driving device that forms a subject image by driving a lens in the optical axis direction and a spring member bonding method.

  In recent years, as camera-equipped mobile phones equipped with cameras have become popular, opportunities for photographing various subjects using the mobile phones have increased. For example, you can shoot a subject that is far away from the camera lens, such as a friend or landscape (normal shooting), or a subject that is close to the camera lens, such as a bus timetable or petals (close-up shooting) There is a case.

  In close-up photography (macro photography), the lens position of the camera needs to be slightly closer to the subject side than the lens position during normal photography. For this reason, this type of photographic lens system includes a drive mechanism that drives the lens to move in the direction of the optical axis, so that the lens can be moved in the direction of the optical axis by driving the drive mechanism by switching a switch. (For example, refer to Patent Document 1).

  A lens driving device disclosed in Patent Document 1 includes a moving lens body, a driving mechanism that moves the moving lens body in the optical axis direction, a fixed body that supports the moving lens body so as to be movable in the optical axis direction, and a moving lens. And restricting means (plate spring) for restricting movement of the body. The drive mechanism has a magnet and a coil. In such a configuration, an electric force is supplied to the coil to generate an electromagnetic force, while a restricting force that opposes the electromagnetic force is generated by the restricting means, and the size of both is adjusted, thereby making the moving lens body a desired one. Can be stopped in position.

  Here, when the above-mentioned regulating means (plate spring) is attached to the fixed body, it is generally performed by welding and fixing with an adhesive. More specifically, a plurality of pins are provided inside the fixed body, and these pins are passed through holes formed in the leaf springs to position them. In this state, the leaf spring is welded to the moving lens body by applying heat and pressure to the pin. Thereafter, an adhesive is applied from an oblique side surface of the leaf spring so as to cover the welded portion. Alternatively, an adhesive is applied in advance to the back surface of the leaf spring (the surface on the imaging element side) or the surface of the fixed body (the surface on the subject side). In this way, the leaf spring is fixed to the fixed body.

JP 2007-94364 A

  However, since the lens driving device itself is a small device, it is unnecessary to apply an adhesive from the oblique side of the leaf spring, or to apply an adhesive to the back surface of the leaf spring or the surface of the fixed body in advance. There is a risk that the adhesive will adhere to the lens and cause performance deterioration of the lens driving device. Moreover, although mentioned later for details, in this case, since it is necessary to raise or lower a semi-finished product in a series of manufacturing processes, it cannot be said that work efficiency is high.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a lens driving device and a spring member bonding which improve efficiency related to a bonding operation between a spring member serving as a restricting unit and a support body supporting a moving body. It is to provide a method.

  In order to solve the above problems, the present invention provides the following.

  (1) In a lens driving device having a movable body that holds a lens and is movable in the optical axis direction, and a support body that supports the movable body via a spring member, the support body is formed of the spring member. A holder having a spring mounting portion to which the support side mounting portion is attached is provided, and a guide portion for injecting an adhesive is formed between the support side mounting portion and the spring mounting portion in the holder. A lens driving device.

  According to the present invention, in the lens driving device having the moving body and the support body, the support body includes the holder having the spring mounting portion to which the support body side mounting portion of the spring member is mounted. Since the guide part for injecting the adhesive is formed between the body side attaching part and the spring attaching part, the adhesive is inserted between the support side attaching part and the spring attaching part through this guide part. It is possible to inject, and as a result, the efficiency of the bonding operation can be increased.

  That is, if a guide portion is formed between the support-side attachment portion and the spring attachment portion, the spring member can be attached to the holder without applying an adhesive in advance to the back surface of the spring member or the front surface of the holder. After the contact, it can be easily bonded through the guide portion. Moreover, even if it does not inject | pour an adhesive agent from the diagonal side surface of a spring member, it can adhere | attach easily through a guide part. Therefore, the efficiency of the bonding operation can be increased. In addition, it is possible to prevent the adhesive from adhering to unnecessary portions and degrading the performance of the lens driving device.

  Here, the “guide portion” may be in any form as long as the shape, configuration, and size communicate with each other between the support-side attachment portion and the spring attachment portion. For example, you may provide the hole connected between a support body side attaching part and a spring attaching part in the side surface of a holder, or the bottom face of a holder.

  (2) The lens driving device, wherein the guide portion is a hole that connects the spring mounting portion and an opposite side of the spring mounting portion sandwiching the holder in the optical axis direction of the lens.

  According to the present invention, the guide portion described above is a hole that connects the spring attachment portion and the opposite side of the spring attachment portion that sandwiches the holder in the optical axis direction of the lens. An adhesive can be injected between the attachment portion and the spring attachment portion.

  In particular, when an adhesive is injected into this hole, the adhesive naturally spreads between the support side attachment part and the spring attachment part (due to capillary action), so that the working efficiency can be further increased, and sufficient Adhesive strength can be ensured (because it is surface adhesion, not point adhesion). In addition, if sufficient adhesive strength can be ensured, it will also function as a stopper for the spring member.

  In addition, since the spring member and the holder can be bonded through the hole after the holder is brought into contact with the spring member, the degree of freedom of work can be ensured and workability can be improved. Furthermore, by injecting the adhesive through the holes, the adhesive does not diffuse at a stretch, but is held by the surface tension and diffused little by little. Therefore, it is possible to prevent leakage of excess adhesive by adjusting the injection amount of the adhesive. In addition, the amount of useless adhesive can be reduced by the capillary action described above, and the amount of adhesive applied can be reduced.

  (3) The lens driving device according to claim 1, wherein a projection for attaching the support-side attachment portion is formed on the spring attachment portion, and the hole is formed in the vicinity of the projection portion.

  According to the present invention, the spring mounting portion described above is provided with a protrusion for attaching the support side attachment portion, and the hole described above is formed in the vicinity of the protrusion. It is possible to preferentially bond the periphery of the portion (the portion where the degree of deformation of the spring member is relatively large), and the bonding strength can be increased efficiently.

  (4) The lens driving device characterized in that an adhesive reservoir portion for storing an adhesive is formed in the vicinity of the guide portion.

  According to the present invention, since the adhesive reservoir portion for accumulating the adhesive is formed in the vicinity of the above-described guide portion, the outflow speed at which the adhesive flows out into the hole can be adjusted.

  (5) A lens driving device having a moving body that holds the lens and is movable in the optical axis direction, and a support that supports the moving body via a spring member, and the spring member is bonded to the support. In the spring member bonding method, the support includes a holder having a spring mounting portion to which the support-side mounting portion of the spring member is mounted, and the holder is between the support-side mounting portion and the spring mounting portion. A guide portion for injecting the adhesive into the contact portion, the contact mounting portion and the spring mounting portion are in contact with each other, an adhesive injection step in which the adhesive is injected through the guide portion, A spring member bonding method comprising:

  According to the present invention, in the lens driving device having the moving body and the support body, the support body includes the holder having the spring mounting portion to which the support body side mounting portion of the spring member is mounted. A guide portion for injecting an adhesive is formed between the body side attachment portion and the spring attachment portion. In the lens driving device having such a configuration, first, the support attachment portion and the spring attachment portion are brought into contact with each other and the adhesive is injected through the guide portion, so that the efficiency of the bonding operation can be improved.

  (6) The spring member bonding method includes an attachment step in which the movable body, the spring member, and the holder are attached to a housing after the adhesive injection step, and the adhesive is injected in the adhesive injection step. The spring member adhering method, wherein the direction in which the holder is attached and the direction in which the holder is attached in the attaching step are the same direction.

  According to the present invention, the above-described spring member bonding method includes an attachment step in which the moving body, the spring member, and the holder are attached to the housing after the adhesive injection step. Since the direction in which the agent is injected and the direction in which the holder is attached in the attachment process are the same direction, it is necessary to raise or lower the semi-finished product in a series of processes for manufacturing the product. No (ie, adhesive injection and attachment of various components to the housing can be done in the same direction, so there is no need to put the semi-finished product up or down). Thereby, working efficiency can be improved.

  According to the lens driving device and the spring member bonding method according to the present invention, the efficiency of the bonding work can be improved using the guide portion. In addition, by injecting the adhesive through the guide portion, the adhesive adheres to unnecessary portions, and performance deterioration of the lens driving device can be prevented. Furthermore, by adopting a hole as the guide portion, it is possible to perform imposition by capillary action, and as a result, the adhesive strength can be increased.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Machine configuration]
FIG. 1 is a perspective view showing an external configuration of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a mechanical configuration of the lens driving device 1 according to the embodiment of the present invention.

  1 and 2, the lens driving device 1 includes a yoke 11, a cover 12, a sleeve 13, a first plate spring 14, a second plate spring 15, a wire spring 16, a magnet 17, The coil 18 (the first coil 181 and the second coil 182) and the holder 19 are provided.

  Note that the illustration of a lens barrel (lens barrel) incorporating a lens is omitted. The lens driving device 1 also moves the sleeve 13 along the direction of the optical axis L in the A direction (front side) approaching the subject (imaging target) and the B direction (rear side) approaching the opposite side (image side) from the subject. (See FIG. 1). The sleeve 13 holding a lens barrel (not shown as described above) in which one or more lenses are incorporated is configured to be movable in the direction of the optical axis L together with the wire spring 16 and the like. It corresponds to an example of “moving body”. The yoke 11, the cover 12, the holder 19, and the like are an example of a “support” that supports the sleeve 13 and the like so as to be movable in the direction of the optical axis L via the first plate spring 14 and the second plate spring 15. It corresponds to. The sleeve 13 and the like are driven in the direction of the optical axis L by the coil 18 and the magnet 17.

  The yoke 11 is made of a ferromagnetic plate such as a steel plate. Further, the yoke 11 is exposed at the front and side surfaces of the lens driving device 1, and a circular incident window 111 is formed at the center of the yoke 11 for taking reflected light from the subject into the lens. On the other hand, the cover 12 is attached to the yoke 11, and a circular incident window 121 is formed at the center of the cover 12 for taking reflected light from the subject into the lens.

  The coil 18 includes a first coil 181 and a second coil 182, which are arranged in two stages in the direction of the optical axis L, both of which are annular. Then, it is wound around the outer peripheral surface of the sleeve 13 at a predetermined interval. In addition, eight magnets 17 are arranged in two stages in the optical axis direction. The magnets 17 of each stage are arranged such that the front magnet 17 is against the first coil 181 and the rear magnet 17 is the first. The two coils 182 are opposed to each other on the outer peripheral side, and are fixed to four corners of the inner peripheral surface of the yoke 11 whose outer shape is substantially rectangular as shown in FIG.

  In the present embodiment, the magnet 17 is magnetized to poles whose inner surface and outer surface are different from each other. For example, the four magnets 17 arranged on the front side are magnetized with the N pole on the inner surface, the outer surface is magnetized with the S pole, and the four magnets 17 arranged on the rear side have an S inner surface. The pole is magnetized and the outer surface is magnetized to the N pole.

  The first plate spring 14 and the second plate spring 15 are both formed from a thin metal plate and have the same thickness in the direction of the optical axis L. As shown in FIG. 2, the first leaf spring 14 is attached to the front end surface of the sleeve 13 in the optical axis direction, and the second leaf spring 15 is attached to the rear end surface of the sleeve 13 in the optical axis direction. . In the present embodiment, as shown in FIG. 2 (not shown), the first leaf spring 14 and the second leaf spring 15 are attached to the arcuate sleeve side attachment portion and the cover 12, respectively. A cover-side attachment portion, and an arm portion that is formed between the sleeve-side attachment portion and the cover-side attachment portion and restricts (bias) movement of the sleeve 13 in the optical axis direction. Is fixed to the cover 12 or the holder 19 by welding, bonding or both. The second leaf spring 15 is composed of two electrically separated spring pieces, and serves as a medium for supplying current from the external power source to the coil 18. The ends are electrically connected to each of the spring pieces.

  Since the yoke 11 is larger than the dimension in the optical axis direction of the region where the first coil 181 and the second coil 182 are arranged, and the dimension in the optical axis direction of the magnet 17, the front magnet 17. Leakage flux from the magnetic path configured between the first coil 181 and the magnetic path configured between the rear magnet 17 and the second coil 182 can be reduced. As a result, the linearity between the amount of movement of the sleeve 13 and the current flowing through the first coil 181 and the second coil 182 can be improved.

  The lens driving device 1 includes an annular wire spring 16. The wire spring 16 applies a biasing force in the direction of the optical axis L to the sleeve 13 by a magnetic attractive force acting between the wire spring 16 and the magnet 17. For this reason, it is possible to prevent the moving body (sleeve 13 or the like) from being displaced by its own weight when the coil is not energized, and as a result, the moving body (sleeve 13 or the like) can be maintained in a desired posture. Yes. Furthermore, the impact resistance is improved.

  The resin-made holder 19 holds an image sensor (not shown) on the image side. The second leaf spring 15 is positioned by being attached to the holder 19.

  Here, the lens driving device 1 according to the present embodiment is characterized by an adhesion method in which the second leaf spring 15 is attached to the holder 19 and both are adhered. More specifically, holes 19a (see FIG. 3) are provided near the four corners of the holder 19 as guide portions for injecting the adhesive, and the adhesive is poured into the holes 19a from the rear side of the holder 19. The holder 19 and the second leaf spring 15 are bonded together. Hereinafter, the hole 19a and the bonding method will be described in detail with reference to FIGS.

[Hole formed in holder]
First, a configuration when the holder 19 is viewed from the rear side (B side shown in FIG. 1) will be described. FIG. 3 is a perspective view when the lens driving device 1 is viewed from the rear side. FIG. 4 is a plan view when only the holder 19 is viewed from the rear side. In FIG. 3, connecting bodies 15 a and 15 a ′ that are connected when the second leaf spring 15 is manufactured are illustrated. These coupling bodies 15a and 15a 'are removed when the product is completed.

  3 and 4, the holder 19 is formed with circular holes 19a as guide portions for injecting adhesive into four locations. The hole 19a passes through the holder 19 and communicates with the second leaf spring 15 on the front side with the holder 19 in between. Each hole 19a is formed in the bottom surface of a recess recessed by a certain depth, and a certain amount of adhesive can be stored in the recess. That is, in the vicinity of the hole 19a, a recess functioning as an adhesive reservoir 19b for storing the adhesive is formed.

  Next, a configuration when the holder 19 is viewed from the front side (A side shown in FIG. 1) will be described. FIG. 5 is a plan view showing a state when the second leaf spring 15 and the holder 19 are extracted and viewed from the front side. FIG. 6 is a plan view showing a state when attention is paid only to the second leaf spring 15 in FIG. FIG. 7 is a plan view showing a state when attention is paid only to the holder 19 in FIG. In addition, in FIG. 5, although the connection body 15a, 15a 'mentioned above is illustrated, in FIG. 6, illustration of these is abbreviate | omitted.

  5 to 7, the second leaf spring 15 includes an arcuate sleeve-side attachment portion 15b attached to the rear end surface in the optical axis direction of the sleeve 13, a holder-side attachment portion 15c attached to the holder 19, and a sleeve. An arm portion 15d that is formed between the side attachment portion 15b and the holder side attachment portion 15c and restricts the movement of the sleeve 13 in the optical axis direction is provided.

  The second leaf spring 15 is composed of two spring pieces 15A and 15B which are electrically separated. Each of the spring pieces 15A and 15B has a sleeve side mounting portion 15b, two holder side mounting portions 15c, and two arm portions 15d. In FIG. 5, one sleeve side attachment portion 15b, two holder side attachment portions 15c, and two arm portions 15d provided on the spring piece 15A are illustrated. Moreover, the arm part 15d is extended to the vicinity of the holder side attaching part 15c arrange | positioned at the adjacent corner | angular part. In addition, a plurality of holes are formed in the sleeve side attachment portion 15b, and this is a hole into which a pin for positioning with respect to the sleeve 13 is mainly fitted.

  An attachment hole 15e into which the protrusion 19c (see FIG. 7) of the holder 19 is inserted is formed in the holder side attachment portion 15c, and the holder side attachment portion 15c is positioned on the holder 19 through the attachment hole 15e. And attached to the holder 19. In the present embodiment, the holder-side attachment portion 15c has a substantially triangular shape centered on the attachment hole 15e. By adopting such a triangular shape, when the holder-side attachment portion 15c is placed on the holder 19, the contact area between the holder-side attachment portion 15c and the spring attachment portion 19d can be increased, and an adhesive can be applied. The area is taken as large as possible. The shape is not limited to a triangle.

  Here, as shown in FIG. 7, the holder 19 in the lens driving device 1 according to the present embodiment has a spring attachment portion (spring attachment surface) to which the holder-side attachment portion 15 c of the second leaf spring 15 is attached. 19d is provided in four places. Moreover, the hole 19a (4 places) for inject | pouring an adhesive agent is formed between these spring attaching parts 19d (4 places) and the holder side attaching parts 15c (4 places). The holes 19a when viewed from the rear side are as described above with reference to FIGS. The spring mounting portion 19 is a pedestal having a substantially triangular shape centered on the spring mounting portion 19d, and is formed to have substantially the same area as the holder side mounting portion 15c or an area larger than that. Has been. The shape is not limited to a triangle.

  The hole 19a connects the spring mounting portion 19d and the opposite side of the spring mounting portion 19d that sandwiches the holder 19 in the optical axis direction of the lens. That is, it passes through the front surface and the rear surface of the holder 19. The spring mounting portion 19d is formed with a projection 19c for attaching the holder-side mounting portion 15c, and the hole 19a is formed in the vicinity of the projection 19c (see the dotted line in FIG. 5). As a result, the adhesive can be preferentially injected into a portion where the degree of deformation of the second leaf spring 15 is large.

  Further, the adhesive injected into the hole 19a soaks between the spring mounting portion 19d of the holder 19 and the holder side mounting portion 15c of the second leaf spring 15 including the vicinity of the protrusion 19c (capillary tube Phenomenon or surface tension). Accordingly, the bonding area between the spring mounting portion 19d and the holder-side mounting portion 15c is widened, and the bonding strength between them (particularly the bonding strength in the vicinity of the protruding portion 19c) can be increased.

  FIG. 8 is a longitudinal sectional view showing a state when AA ′ in FIG. 7 is cut.

  As shown in FIG. 8, the adhesive passes through the adhesive reservoir 19b before being injected into the hole 19a. Due to the presence of the adhesive reservoir 19b, the flow rate of the adhesive flowing out from the adhesive reservoir 19b to the hole 19a can be adjusted when the adhesive is poured from the rear side (B side). Further, the adhesive functions as a pool while penetrating into the gap between the spring mounting portion 19d and the holder side mounting portion 15c.

  In the present embodiment, the shape of the hole 19a is circular, but the present invention is not limited to this. For example, a triangular shape, a quadrangular shape, or a tapered shape with different diameters depending on the depth may be used. Similarly, the shape and depth of the adhesive reservoir 19b are not limited. Furthermore, examples of the adhesive poured into the hole 19a include a thermosetting adhesive. This adhesive basically has a low viscosity, and when heated, it becomes watery. And when it cools, it begins to form a viscosity, and it has the property of solidifying at room temperature.

[Adhesion method]
First, a conventional bonding method will be described. First, the rear side of the sleeve 13 is turned up, and the second leaf spring 15 is attached thereon. Further, with the holder 19 placed thereon, the sleeve 13, the second leaf spring 15, and the holder 19 are turned over together, and an adhesive is applied to the vicinity of the protrusion 19c from the front oblique side surface ( In some cases, pressure welding is performed before that). Thereby, the 2nd leaf | plate spring 15 and the holder 19 can be adhere | attached. Thereafter, the sleeve 13, the second leaf spring 15, and the holder 19 are turned over again and housed in the yoke 11 in order to complete the lens driving device 1.

  In addition to this, as a conventional bonding method, first, the rear side of the sleeve 13 is turned up, and the second leaf spring 15 is attached thereon. Then, an adhesive is applied in advance to the rear side (here, the upper side) of the holder-side attachment portion 15 c of the second leaf spring 15, and then the sleeve 13 and the second leaf spring 15 are turned over and attached to the holder 19. Thereby, the 2nd leaf | plate spring 15 and the holder 19 can be adhere | attached. Alternatively, an adhesive is applied to the spring mounting portion 19 d of the holder 19 in advance, and the sleeve 13 and the second plate spring 15 are turned over and attached to the holder 19. Also by this, the 2nd leaf | plate spring 15 and the holder 19 can be adhere | attached. Thereafter, the sleeve 13, the second leaf spring 15, and the holder 19 are turned over and housed in the yoke 11 in order to complete the lens driving device 1.

  Thus, in the conventional bonding method, it is necessary to raise or lower the semi-finished product such as the sleeve 13, the second leaf spring 15, or the holder 19 in a series of manufacturing steps. There was room for improvement.

  On the other hand, the spring member bonding method according to the present embodiment is different from these methods. Specifically, first, with the rear side of the sleeve 13 facing upward, the second leaf spring 15 is attached thereon, and the holder 19 is placed thereon. Thereby, the holder side attaching part 15c and the spring attaching part 19d contact | abut (contact process). Then, after that, the adhesive is injected into the hole 19a without turning over (from the rear side to the front side, that is, from the top to the bottom) (adhesive injection step). Then, as described above, due to the capillary phenomenon, the adhesive soaks between the holder side attaching portion 15c and the spring attaching portion 19d, and both are bonded. Thereafter, the sleeve 13, the second leaf spring 15, and the holder 19 are accommodated in a substantially box-shaped yoke 11 (an example of a housing) as it is (without being turned upside down).

  Thus, according to the bonding method according to the present embodiment, the direction in which the adhesive is injected (rear side → front side) and the direction in which the holder 19 is attached to the yoke 11 (rear side → front side) are the same direction. It has become. Therefore, it is not necessary to raise or lower the semi-finished product, so that work efficiency can be improved.

[basic action]
In the lens driving device 1 according to the present embodiment, the moving body is normally located on the image sensor side (image side) (when the first coil 181 and the second coil 182 are not energized). At this time, the wire spring 16 regulates the displacement of the moving body by a magnetic attractive force acting between the wire 17 and the magnet 17. However, since the distance between the wire spring 16 and the magnet 17 is maintained to some extent, the magnetic attractive force between the wire spring 16 and the magnet 17 does not become too strong. As a result, it is possible to prevent the center axis of the moving body from being shifted, and thus to prevent the tilt characteristics from deteriorating.

  In such a state, when a current is passed through the first coil 181 and the second coil 182, the first coil 181 and the second coil 182 receive an upward (front) electromagnetic force, respectively. As a result, the first coil 181, the second coil 182, and the sleeve 13 begin to move toward the subject side (front side).

  At this time, an elastic force that restricts the movement of the sleeve 13 is generated between the first leaf spring 14 and the front end of the sleeve 13 and between the second leaf spring 15 and the rear end of the sleeve 13. . For this reason, when the electromagnetic force that moves the sleeve 13 forward and the elastic force that restricts the movement of the sleeve 13 are balanced, the sleeve 13 stops. In addition, when a reverse current is passed through the first coil 181 and the second coil 182, the first coil 181 and the second coil 182 receive a downward (rear) electromagnetic force, respectively. .

  At that time, by adjusting the amount of current flowing through the first coil 181 and the second coil 182 and the elastic force acting on the sleeve 13 by the first leaf spring 14 and the second leaf spring 15, the sleeve 13 (moving) Body) can be stopped at a desired position. In addition, by stopping the sleeve 13 using the balance between the electromagnetic force and the elastic force, unlike the case where the members are brought into contact with each other so as to be locked with the locking portion or the like, it is possible to prevent occurrence of a collision sound. .

[Main effects of the embodiment]
According to the lens driving device 1 according to the present embodiment, as described with reference to FIGS. 3 to 8, a hole as a guide portion capable of injecting an adhesive into the spring mounting portion 19 d of the holder 19. 19a is formed. As a result, the adhesive can be injected from the rear side of the holder 19 with the second leaf spring 15 brought into contact with the holder 19, and the adhesive injection work can be simplified. As a result, the efficiency of the bonding operation can be improved.

  Further, since the adhesive injected into the hole 19a naturally spreads due to the capillary phenomenon, the working efficiency can also be improved in this respect. Furthermore, if the bonding area is widened, the bonding strength can be secured, and if the bonding strength can be secured, the anti-rotation function can be exhibited. In particular, in order to increase the contact area with the holder 19, the holder side attachment portion 15c in the present embodiment has a substantially triangular shape. For this reason, the bonding area is increased, and the anti-rotation function can be more effectively exhibited.

  Further, even when the lens driving device 1 itself is small, it is possible to prevent the adhesive from adhering to unnecessary portions and the performance of the lens driving device 1 from deteriorating.

  Moreover, if the diameter of the hole 19a is set to an appropriate size, the amount of adhesive applied can be saved. If the diameter of the hole 19a is set to an appropriate size, it is possible to prevent the excess adhesive from spreading (leaking) to other than the spring mounting portion 19d of the holder 19. In this way, a small hole 19a is formed in the holder 19, an adhesive is injected into the hole 19a, and a surface tension is applied between the holder-side attachment portion 15c and the spring attachment portion 19d to thereby apply the applied adhesive. Even if there is no work such as spreading, the adhesive can be efficiently applied to the spring mounting portion 19d at a pinpoint.

  Further, since the second plate spring 15 and the holder 19 can be bonded through the hole 19a after the holder 19 is brought into contact with the second plate spring 15, the degree of freedom of work can be ensured.

  Further, since the hole 19a is formed in the vicinity of the protrusion 19c of the holder 19, it is possible to preferentially bond a portion where the degree of deformation of the second leaf spring 15 is relatively large, that is, the vicinity of the protrusion 19c. And as a result, the adhesive strength can be increased.

  Further, in the present embodiment, the adhesive reservoir 19b is formed, and thereby the outflow speed at which the adhesive flows out into the hole 19a can be adjusted. Specifically, even if the adhesive has a viscosity like water, it takes a certain amount of time for the adhesive to permeate between the holder-side attachment portion 15c and the spring attachment portion 19d. Therefore, the reservoir can be covered with the volume of the adhesive reservoir 19b (the volume based on the thickness of the holder 19). In particular, in the present embodiment, the adhesive reservoir 19d is formed using the thickness of the holder 19, so that the volume of the adhesive reservoir 19d can be easily changed by processing the holder 19 or the like. it can.

  Furthermore, as explained in [Adhesion method], it is not necessary to move the semi-finished product up and down during the assembly process, so that the work efficiency can be improved.

  In the present embodiment, the hole 19a is considered as the “guide portion”. However, the present invention is not limited to this. For example, the hole 19a is not provided on the rear side of the holder 19, but the hole 19a is formed on the side surface of the holder 19. May be provided. In addition to the camera-equipped mobile phone, the lens driving device 1 can be attached to various electronic devices. For example, PHS, PDA, bar code reader, thin digital camera, surveillance camera, vehicle rear view confirmation camera, door with optical authentication function, and the like.

  The lens driving device and the spring member bonding method according to the present invention are useful for improving the efficiency of bonding work.

It is a perspective view which shows the external appearance structure of the lens drive device which concerns on embodiment of this invention. It is a disassembled perspective view which shows the machine structure of the lens drive device which concerns on embodiment of this invention. It is a perspective view when a lens drive device is seen from the rear side. It is a top view when only a holder is seen from the rear side. It is a top view which shows a mode when the 2nd leaf | plate spring and a holder are extracted and it sees from the front side. It is a top view which shows a mode when paying attention only to the 2nd leaf | plate spring among FIG. It is a top view which shows a mode when paying attention only to a holder among FIG. It is a longitudinal cross-sectional view which shows a mode when AA 'of FIG. 7 is cut | disconnected.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 11 Yoke 12 Cover 13 Moving body (sleeve)
14 First plate spring 15 Second plate spring 16 Wire spring 17 Magnet 18 Coil 19 Holder 19a Hole 19b Adhesive reservoir

Claims (6)

A movable body that holds the lens and is movable in the optical axis direction;
A lens driving device having a support that supports the movable body via a spring member,
The support includes a holder having a spring attachment portion to which a support-side attachment portion of the spring member is attached,
The lens driving device according to claim 1, wherein the holder is formed with a guide portion for injecting an adhesive between the support side attachment portion and the spring attachment portion.   The lens driving device according to claim 1, wherein the guide portion is a hole that connects the spring attachment portion and an opposite side of the spring attachment portion that sandwiches the holder in the optical axis direction of the lens. The spring mounting portion is formed with a protrusion for mounting the support side mounting portion.
The lens driving device according to claim 2, wherein the hole is formed in the vicinity of the protrusion.   4. The lens driving device according to claim 1, wherein an adhesive reservoir portion for storing an adhesive is formed in the vicinity of the guide portion. 5. A spring member that holds a lens and is movable in the optical axis direction, and a support member that supports the movable body via a spring member, and that adheres the spring member to the support In the bonding method,
The support includes a holder having a spring mounting portion to which the support side mounting portion of the spring member is mounted, and the holder injects an adhesive between the support side mounting portion and the spring mounting portion. With a guide section
A contact step in which the support attachment portion and the spring attachment portion are in contact with each other;
An adhesive injection process in which an adhesive is injected through the guide portion. The spring member bonding method includes an attachment step in which the movable body, the spring member, and the holder are attached to a housing after the adhesive injection step.
6. The spring member bonding method according to claim 5, wherein a direction in which the adhesive is injected in the adhesive injection step and a direction in which the holder is attached in the attachment step are the same direction.

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