JP2011112933A - Lens drive unit, camera module on which lens drive unit is mounted, and cellular phone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive unit capable of suppressing the occurrence of deviation of a holder stopping position due to inertia, without adding a complex control function. <P>SOLUTION: The lens drive unit includes: a holder 10 which holds a lens unit and can be moved in the optical axis direction of the lens unit; a holder moving and stopping mechanism which moves the holder 10 in the optical axis direction and stops the holder 10; and a column 32 which is provided near the circumferential surface of the holder 10 outside in the radial direction of the holder 10 and extends in the optical axis direction. Further, the lens drive unit includes a grease 90 serving as a stop auxiliary member which is held by the circumferential surface of the holder 10, comes into slide contact with the column 32, and suppresses the inertia generated by movement by slide contact resistance generated by slide contact, to assist the stopping. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens driving device that moves a lens module in the optical axis direction by guiding the shaft disposed in the optical axis direction, a camera module equipped with the lens driving device, and a mobile phone.

  In recent years, it has become common to mount a camera module on a mobile phone. Since it is difficult to manually focus the camera module, an automatic focusing function (autofocus) is an essential function. A lens driving device is used for auto-focusing the camera module. On the other hand, with the reduction in thickness and size of mobile phones, there is an increasing demand for reducing the space provided to the lens driving device. In order to meet this demand, for example, a structure using a moving magnet type linear drive system is often used as a structure for driving the lens unit of the lens driving device. It is known that the structure using this moving magnet type linear drive system can generally simplify the structure as compared with the structure using a stepping motor, so that the lens drive device can be miniaturized. An example of a lens driving device having a structure using such a moving magnet type linear driving system is shown in FIGS.

  In the lens driving device 101 shown in FIGS. 9 and 10, a magnet 120 is attached to a holder 110 that holds a lens unit 113 including an optical lens 111 and a lens barrel 112. On the other hand, a coil 160 is mounted on a support column 132 extending in the optical axis direction from a base 130 fixed to the camera module body. A magnetic plate 170 is further provided outward in the radial direction of the coil 160. The base 130 is further provided with a Hall element 104 for measuring the position of the holder 110, and position information measured by the Hall element 104 is sent to a CPU (Central Processing Unit) 105. Further, the CPU 105 moves the holder 110 through the driver 106.

  Specifically, the magnet 110 mounted on the holder 110 receives a force in the optical axis direction by the electromagnetic driving force generated when the driver 106 applies an electric current to the coil 160, so that the holder 110 receives the light of the lens unit 113. Move in the axial direction. When the current is stopped, the electromagnetic driving force is also stopped, so that the movement of the holder 110 is also stopped. Furthermore, when the magnet 120 mounted on the holder 110 is attracted to the magnetic plate 170, the position of the holder 110 is maintained at the stopped position. That is, the magnet 120, the coil 160, the magnetic plate 170, the Hall element 104, the CPU 105, and the driver 106 form a holder movement stop mechanism that moves and stops the holder 110 in the optical axis direction.

  However, since the inertia occurs in the holder 110 due to the movement, the holder 110 does not always stop immediately even if the current is stopped. Therefore, the stationary position may deviate from the planned position. In particular, when the holder 110 is moved under the influence of gravity in addition to the electromagnetic driving force, the deviation of the stop position of the holder 110 can be further increased. Thus, a technique for suppressing such inertial movement by electromagnetic force has been proposed (see, for example, Patent Document 1). According to Patent Document 1, in addition to the frictional force between the guide member and the holder, it is described that the holder is rapidly decelerated by applying a voltage that suppresses inertial movement (for example, [Claim 1], [0006], [0012] etc.).

JP 2006-220776 A

  However, in order to “provide a voltage that suppresses inertial movement”, it is necessary to apply a voltage opposite to that during movement for a shorter time than during movement, and the design of the control function including the optimum time is complicated. It becomes. In addition, it is necessary to add a circuit having such a control function to the holder movement stop mechanism, which complicates the circuit configuration.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens driving device that can suppress the deviation of the holder stop position due to inertia without adding a complicated control function. It is another object of the present invention to provide a camera module equipped with the lens driving device and a mobile phone equipped with the camera module.

  The lens driving device according to the present invention includes a holder that holds the lens unit and is movable in the direction of the optical axis of the lens unit, a holder movement stop mechanism that moves and stops the holder in the optical axis direction, The lens driving device includes a support column that is provided outward in the radial direction of the holder in the vicinity of the outer peripheral surface of the holder and extends in the optical axis direction. It further includes a stop assisting member that is held on the outer peripheral surface of the holder and that is in sliding contact with the support column and that suppresses inertia generated by the movement and assists the stop by sliding contact resistance generated by the sliding contact.

  According to the above-described configuration, there is further provided a stop auxiliary member that is held on the outer peripheral surface of the holder and that is in sliding contact with the support, and that suppresses inertia caused by movement by sliding contact resistance generated by sliding contact and assists the stop. It is possible to suppress the stoppage due to the inertia and the occurrence of a shift between the actual stop position of the holder and the desired stop position.

  In addition, since the stop auxiliary member is held on the outer peripheral surface of the holder and slidably contacts the support column, the gap between the outer peripheral surface of the holder and the support column is filled, so that an effect of suppressing rattling during the holder movement can be expected. .

  Examples of the sliding contact resistance include dynamic friction generated when the members are in sliding contact with each other, adhesive force generated when the adhesive member is in contact, and the like. For example, when at least one of dynamic friction and adhesive force acts, sliding contact resistance can be generated.

  The lens driving device according to the present invention includes a holder that holds the lens unit and is movable in the direction of the optical axis of the lens unit, a holder movement stop mechanism that moves and stops the holder in the optical axis direction, The lens driving device includes a support column that is provided outward in the radial direction of the holder in the vicinity of the outer peripheral surface of the holder and extends in the optical axis direction. A stop assisting member is further provided which is held by the support and slidably contacts the outer peripheral surface of the holder, and suppresses inertia generated by the movement and assists the stop by sliding contact resistance generated by the sliding contact.

  According to the above-described configuration, there is further provided a stop assisting member that is held by the support and is in sliding contact with the outer peripheral surface of the holder, and the sliding contact resistance generated by the sliding contact suppresses the inertia generated by the movement and assists the stop. It is possible to suppress the stoppage due to the inertia and the occurrence of a shift between the actual stop position of the holder and the desired stop position.

  In addition, since the stop auxiliary member is held by the support column and is in sliding contact with the outer peripheral surface of the holder, the gap between the outer peripheral surface of the holder and the support column is filled, so that an effect of suppressing rattling during holder movement can be expected. .

  Examples of the sliding contact resistance include dynamic friction generated when the members are in sliding contact with each other, adhesive force generated when the adhesive member is in contact, and the like. For example, when at least one of dynamic friction and adhesive force acts, sliding contact resistance can be generated.

In the lens driving device according to the present invention, it is preferable that the stop auxiliary member is formed of grease.
According to the above configuration, since the stop auxiliary member is formed of grease, the stop auxiliary member can be formed at a general cost. Further, since the stop auxiliary member is brought into sliding contact with the outer peripheral surface of the support column or the holder, if the sliding contact resistance is too large, movement is hindered. If it is grease, the possibility of excessive sliding resistance is small. In addition, since many products with different viscosities and the like are commercially available and the amount to be retained is easy to adjust, it is easy to adjust the dynamic friction and the adhesive force, which are the causes of sliding contact resistance.

  In the lens driving device according to the present invention, a concave portion for holding the stop auxiliary member formed by the grease is provided on an outer peripheral surface of the holder or the support column holding the stop auxiliary member. preferable.

  According to the above configuration, since the recessed portion for holding the stop auxiliary member formed of grease is provided on the outer peripheral surface of the holder holding the stop auxiliary member or the support column, the stop auxiliary member formed of grease Can be easily held. Further, since the amount of grease and the sliding contact area can be easily adjusted by changing the shape of the recessed portion, the sliding contact resistance can be adjusted more easily.

  A camera module according to the present invention includes the above-described lens driving device. Since the above-described lens driving device is a lens driving device that suppresses a deviation between the actual stop position of the holder and a desired stop position, it can be a lens driving device with high driving accuracy. Therefore, a camera module equipped with this lens driving device can be a highly accurate camera module.

  A mobile phone according to the present invention is characterized by mounting the above-described camera module. Since the above-described camera module can be a small and highly accurate camera module, it is suitable as a camera module mounted on a mobile phone.

  ADVANTAGE OF THE INVENTION According to this invention, the lens drive device which can suppress generation | occurrence | production of the shift of the holder stop position by inertia without adding a complicated control function can be provided. In addition, a camera module equipped with this lens driving device and a mobile phone equipped with the camera module can be provided.

It is drawing explaining one Embodiment of the mobile phone concerning this invention, Comprising: It is a schematic diagram which shows the closed state of a mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the mobile telephone concerning this invention, Comprising: While it is a schematic diagram which shows the open state of a mobile telephone, (a) is a perspective view which shows an inner surface, (b) is a back surface. It is a perspective view shown. It is drawing explaining one Embodiment of the mobile telephone concerning this invention, Comprising: It is a schematic diagram which shows the structure of a camera module. It is drawing explaining one Embodiment of the mobile telephone concerning this invention, Comprising: It is a disassembled perspective view of the lens drive device of the camera module mounted in a mobile telephone. It is drawing explaining one Embodiment of the mobile phone concerning this invention, Comprising: It is a perspective view of a lens drive device. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the mobile phone concerning this invention, Comprising: (a) is a perspective view of the holder of a lens drive device, (b) is a top view of a lens drive device. It is drawing explaining 2nd Embodiment of the mobile telephone concerning this invention, Comprising: (a) is the partial expansion perspective view of the holder before grease insertion, (b) is the partial expansion perspective view of the holder after grease insertion. FIG. It is drawing explaining 2nd Embodiment of the mobile telephone concerning this invention, Comprising: It is a perspective view of a base. It is drawing explaining the conventional lens drive device, Comprising: It is a perspective view of a lens drive device. It is drawing explaining the conventional lens drive device, Comprising: It is a schematic diagram which shows the structure of a camera module.

(First embodiment)
Hereinafter, an embodiment of a mobile phone embodying the mobile phone of the present invention will be described with reference to the drawings. As shown in FIG. 1, the mobile phone is a mobile phone configured to be folded around a hinge H. FIG. 1 shows a folded state, and a cover glass 9 which is a part of the camera module is exposed on the front surface. FIG. 2A is a diagram in which the mobile phone is opened and the display unit 81 and the operation unit 82 are in front. FIG. 2B is a view of the opened mobile phone as viewed from the back. The photographer turns the shutter by operating the operation unit 82 while confirming the image on the display unit 81 toward the object for which the cover glass 9 is to be photographed with the mobile phone opened in this manner. You can shoot.

Next, the configuration of the camera module when the lens driving device 1 of the present embodiment is mounted on a camera will be described with reference to FIG.
As shown in FIG. 3, the filter 2 and the image sensor 3 are arranged on the base 30 side of the lens driving device 1. In the base 30, the Hall element 4 is disposed as a position detection element. Based on the signal from the Hall element 4, the position of the lens module 1a is detected.

  During the focusing operation, a CPU (Central Processing Unit) 5 controls the driver 6 to move the lens module 1a from the home position to a preset position toward the object side in the optical axis direction. At this time, a position detection signal from the Hall element 4 is input to the CPU 5. At the same time, the CPU 5 processes a signal input from the image sensor 3 to obtain a contrast value of the captured image. Such an operation is repeated, and the position of the lens module 1a having the best contrast value is acquired as the in-focus position.

  Thereafter, the CPU 5 drives the lens module 1a to such a focus position. Specifically, the CPU 5 monitors the signal from the hall element 4 and drives the lens module 1a until the signal from the hall element 4 is in a state corresponding to the in-focus position. With this operation, the lens module 1a moves to the in-focus position.

  Next, with reference to FIGS. 4 and 5, the entire configuration of the lens driving device 1 for driving the lens module 1a will be described in detail. The lens driving device 1 includes a lens module 1a that can move in the optical axis direction, and a fixed body 1b that applies driving force to the lens module 1a and is fixed to a device on which the lens driving device 1 is mounted. Yes. The lens driving device 1 moves the lens module 1a in the optical axis direction to realize autofocus. In addition, the lens driving device 1 of the present embodiment is formed in a square of about 8.5 mm in a plan view in the optical axis direction, and the height of the lens driving device 1 in the optical axis direction is formed to be about 3 mm. ing.

  The lens module 1a is also formed with a lens unit 13 including a plurality of optical lenses 11 and a lens barrel 12 that holds the plurality of optical lenses 11, and a resin that holds the lens unit 13, with reference to FIG. It is comprised by the holder 10 and the some magnet 20 fixed to the holder 10. FIG. Note that four magnets 20 of the present embodiment are fixed to the holder 10 so as to surround the lens unit 13 in the circumferential direction from the outside in the radial direction through a certain distance in the circumferential direction. The holder 10 is formed by injection molding a resin material. In that case, the magnet 20 can be previously mounted on a mold for forming the holder 10 and the holder can be integrally formed with the magnet 20 simultaneously with the injection molding. By using such a manufacturing method, the bonding strength between the magnet 20 and the holder 10 can be improved as compared with the case where the magnet 20 and the holder 10 are bonded with an adhesive. Moreover, the attachment process of the magnet 20 can be omitted, which contributes to cost reduction.

  The holder 10 has a main shaft hole 15 that is a through hole in the optical axis direction into which the main shaft 51 is inserted, and a sub shaft that is a through hole in the optical axis direction into which the sub shaft 52 is inserted. A shaft hole 16 is provided. Since the main shaft 51 and the sub shaft 52 are arranged in the optical axis direction of the lens unit 13, the inner peripheral surface of the main shaft hole 15 is brought into sliding contact with the outer peripheral surface of the main shaft 51, and The lens module 1a can be moved in the optical axis direction by moving the holder 10 in a state where the peripheral surface is in sliding contact with the outer peripheral surface of the sub shaft 52.

  The fixed body 1b is fixed to the base 30 and the cover 40 constituting the outer frame of the lens driving device 1, and the main shaft 51 and the sub shaft 52 described above that guide the movement of the holder 10 in the optical axis direction. And a coil 60 that forms a magnetic field when an electric current is applied thereto. A magnetic plate 70, which is a rectangular plate-like magnetic member formed of a magnetic steel plate, is fixed to the base 30 on the outer side in the radial direction of the coil 60.

  The base 30 is provided with a base 31 constituting the lower surface of the outer frame of the lens driving device 1 and a support column 32 extending from the base 31 along the optical axis direction. The base 31 is formed in a square shape in a plan view in the optical axis direction. The support columns 32 are provided at the four corners of the base 31. An opening 33 that is a circular through hole is formed at the center of the base 31.

  Of the columns 32, the object side surface of the column in the vicinity of the main shaft 51 is extended inward in the radial direction, and the object side stopper 32a that defines the object side movement limit is formed by contacting the image side surface of the lens module 1a. Is formed. On the other hand, the base 31 forming the image side surface of the base 30 serves as a stopper that defines the movement limit on the image side when the image side surface of the lens module 1a comes into contact.

  The object-side stopper 32a is provided with an upper end support hole which is a through hole for supporting an upper end (hereinafter simply referred to as “upper end”) in the optical axis direction of the main shaft 51. On the other hand, the base 30 is a recess for supporting a lower end portion (hereinafter, simply referred to as “lower end portion”) of the main shaft 51 in the optical axis direction whose central axis is directed in the optical axis direction of the lens unit 13. A shaft lower end support (not shown) is further provided. Accordingly, the main shaft 51 is supported at the upper end portion by the upper end support hole and at the lower end portion by the shaft lower end support portion. A shaft lower end support portion (not shown) that is a recess for supporting the lower end portion of the sub shaft 52 is further provided in the base 30, and only the lower end portion of the sub shaft 52 is supported by the shaft lower end support portion. Yes. When the holder 10 is inserted in a manner slidable with respect to the main shaft 51 and the sub shaft 52, the lens module 1 a that has received the force to move in the optical axis direction is applied to the main shaft 51 and the sub shaft 52. Guided and movable in the optical axis direction.

  Further, the cover 40 constituting the outer side surface and the upper surface of the lens driving device 1 is attached to the base 30 so as to surround the outer side in the radial direction of the coil 60. Further, the upper surface of the cover 40 has a plurality of through holes 41 for inserting upper end portions in the optical axis direction of the plurality of support columns 32, and the cover 40 is inserted with corresponding end portions. Is fixed to the base 31.

  The lens driving device 1 further includes a stop auxiliary member that is held on the outer peripheral surface of the holder 10 and that is in sliding contact with the support column 32 and suppresses inertia generated by movement by the sliding contact resistance generated by the sliding contact and assists the stop. I have. Specifically, as shown in FIG. 6A, grease 90 as a stop assisting member is held on the outer peripheral surface of the holder 10 and at a location close to the support column 32. When the holder 10 is attached to the base 30 in this state, as shown in FIG. 6B, the grease 90 comes into sliding contact with the support columns 32 provided close to the outer peripheral surface of the holder 10. Therefore, when the holder 10 moves in the optical axis direction, dynamic friction and adhesive force are generated between the holder 10 and the support column 32. The sliding resistance generated by this dynamic friction and adhesive force can suppress the residual inertia when the holder 10 is stopped, and can reduce the deviation of the stop position.

  The magnitude of this sliding resistance can be easily adjusted. For example, since the viscosity and adhesiveness of the grease can be changed by changing the type of the grease 90, the magnitude of the dynamic friction and the adhesive force also changes. Moreover, since the sliding contact area with the support | pillar 32 changes by changing the quantity of the grease 90, the magnitude | size of dynamic friction and adhesive force also changes. Accordingly, the sliding resistance also changes.

  Furthermore, since the gap between the outer peripheral surface of the holder 10 and the support column 32 is filled with the grease 90, an effect of suppressing rattling when the holder 10 is moved can be expected. There are many possible reasons for the rattling that occurs when the holder 10 is moved, and this cannot be attributed to one factor. However, the holder 10 may be repeatedly contacted / disengaged with the support 32 during the movement. It is considered to be a factor. This is because when the grease 90 enters between the outer peripheral surface of the holder 10 and the support column 32, repeated contact and separation can be prevented. Further, when the grease 90 enters between the outer peripheral surface of the holder 10 and the support column 32, the grease 90 functions as a damper agent, and movements other than movement of the holder 10 in the optical axis direction are generally suppressed. Conceivable. As a result, a suppression effect can be expected for the occurrence of rattling caused by causes other than repeated contact and separation. Furthermore, an effect of suppressing noise generation caused by rattling can be expected.

  As shown in FIG. 7A, a recessed portion 91 for holding the grease 90 is provided on the outer peripheral surface of the holder 10 and in a location close to the support column 32. As shown in FIG. 7B, the grease 90 is applied to the recessed portion 91, so that the grease 90 is held on the outer peripheral surface of the holder 10 and in the vicinity of the support column 32. By providing the recessed portion 91, it becomes easy to hold the grease 90 on the outer peripheral surface of the holder 10.

According to the lens driving device 1 of the present embodiment, the following effects can be obtained.
(1) In this embodiment, a stop assist that is held on the outer peripheral surface of the holder 10 and is in sliding contact with the support column 32, and the sliding contact resistance generated by the sliding contact suppresses the inertia generated by the movement and assists the stop. Since the grease 90 which is a member is provided, it is possible to suppress the stoppage due to inertia and the occurrence of a shift between the actual stop position of the holder 10 and the desired stop position.

  (2) Further, since the grease 90 is held on the outer peripheral surface of the holder 10 and slidably contacts the support column 32, the gap between the outer peripheral surface of the holder 10 and the support column 32 is filled. The effect which suppresses can also be expected.

  (3) In this embodiment, since the stop auxiliary member is formed of the grease 90, the stop auxiliary member can be formed at a general-purpose cost. In general, since the stop auxiliary member is in sliding contact with the support column, if the sliding resistance is too large, movement is hindered. If the stop auxiliary member is grease as in the present embodiment, the possibility of excessive sliding resistance is small. In addition, since many products with different viscosities and the like are commercially available and the amount to be retained is easy to adjust, it is easy to adjust the sliding resistance consisting of dynamic friction and adhesive force.

  (4) In this embodiment, since the recessed part 91 for holding the grease 90 is provided on the outer peripheral surface of the holder 10, the grease 90 can be easily held. Further, by changing the shape of the recessed portion 91, the amount of the grease 90 and the sliding contact area can be easily adjusted, so that the sliding contact resistance can be adjusted more easily.

  (5) The camera module in the present embodiment is equipped with the lens driving device 1 that is improved in driving accuracy by suppressing the occurrence of deviation between the actual stop position of the holder 10 and the desired stop position. Therefore, it can be a highly accurate camera module.

  (6) In addition, since the mobile phone according to the present embodiment is equipped with the small and high-precision camera module, the mobile phone can be a small mobile phone having a high-accuracy shooting function. Therefore, it can be suitably used for a mobile phone that is particularly required to be downsized.

(Second Embodiment)
Next, a mobile phone according to a second embodiment of the present invention will be described with reference to FIG. In addition, since 2nd Embodiment is a structure which only changed the holding method of the holder 90 of the 1st Embodiment, the structure of the support | pillar 32, and the grease 90 as a stop auxiliary member, it is the detail about the same part. The detailed explanation is omitted.

  In the second embodiment, a stop assist that is held by the support column 32 and slidably contacts the outer peripheral surface of the holder 10 to suppress the inertia generated by the movement by the slidable contact resistance generated by the slidable contact and assist the stop. A member is further provided. Specifically, as shown in FIG. 8, grease 90 as a stop assisting member is held on the support column 32 at a location close to the outer peripheral surface of the holder 10. When the holder 10 is attached to the base 30 in this state, the grease 90 of the support column 32 provided close to the outer peripheral surface of the holder 10 is in sliding contact with the outer peripheral surface of the holder 10. Therefore, friction is generated between the holder 10 and the support column 32 when the holder 10 moves in the optical axis direction. By this friction, the inertia remaining when the holder 10 is stopped can be suppressed, and the deviation of the stop position can be reduced.

  The magnitude of this sliding resistance can be easily adjusted. For example, since the viscosity and adhesiveness of the grease can be changed by changing the type of the grease 90, the magnitude of the dynamic friction and the adhesive force also changes. Further, since the sliding contact area with the holder 10 is changed by changing the amount of the grease 90, the dynamic friction and the magnitude of the adhesive force are also changed. Accordingly, the sliding resistance also changes. Here, in the second embodiment, the grease 90 is extended in the optical axis direction so that the grease 90 is always in sliding contact with the outer peripheral surface of the holder 10 regardless of where the holder 10 is moved. Held in state.

  Furthermore, since the gap between the outer peripheral surface of the holder 10 and the support column 32 is filled with the grease 90, an effect of suppressing rattling when the holder 10 is moved can be expected. Since the grease 90 enters between the outer peripheral surface of the holder 10 and the support 32, the contact and separation between the outer peripheral surface of the holder 10 and the support 32 can be prevented for the same reason as in the first embodiment. It is.

  A recessed portion 92 for holding the grease 90 is provided in a portion of the support column 32 adjacent to the outer peripheral surface of the holder 10. By applying the grease 90 to the recessed portion 92, the grease 90 is held by the portion of the column 32 that is close to the outer peripheral surface of the holder 10. By providing the recess 92, the grease 90 can be easily held on the support column 32.

According to the lens driving device 1 of the second embodiment, the following effects can be obtained.
(1) In the second embodiment, the suspension is held by the support column 32 and slidably contacted with the outer peripheral surface of the holder 10, and the inertia generated by the movement is suppressed and the stop is assisted by the sliding contact resistance generated by the sliding contact. Since the grease 90 which is a stop assisting member is provided, it is possible to suppress the stoppage due to inertia and the occurrence of a shift between the actual stop position of the holder 10 and the desired stop position.

  (2) Also, since the grease 90 is held by the support column 32 and slidably contacts the outer peripheral surface of the holder 10, the gap between the outer peripheral surface of the holder 10 and the support column 32 is filled. The effect which suppresses can also be expected.

  (3) In the second embodiment, since the stop auxiliary member is formed of the grease 90, the stop auxiliary member can be formed at a general-purpose cost. In general, since the stop auxiliary member is brought into sliding contact with the support, if the friction is too large, the movement is hindered. If the stop auxiliary member is grease as in the present embodiment, the possibility of excessive friction is small. Moreover, since many things with different viscosity etc. are marketed, and adjustment of the amount to hold | maintain is easy, adjustment of sliding contact resistance is easy.

  (4) In the second embodiment, since the recessed portion 92 for holding the grease 90 is provided in the support column 32, the grease 90 can be easily held. Further, by changing the shape of the recessed portion 92, the amount of the grease 90 and the sliding contact area can be easily adjusted, so that the sliding contact resistance can be adjusted more easily.

  (5) The camera module according to the second embodiment is equipped with the lens driving device 1 that is improved with high driving accuracy by suppressing the deviation between the actual stop position of the holder 10 and the desired stop position. Therefore, it can be a highly accurate camera module.

  (6) In addition, since the mobile phone according to the present embodiment is equipped with the small and high-precision camera module, the mobile phone can be a small mobile phone having a high-accuracy shooting function. Therefore, it can be suitably used for a mobile phone that is particularly required to be downsized.

In addition, you may change this embodiment as follows.
-In 1st Embodiment, the recessed part 91 for hold | maintaining the stop auxiliary member formed of the grease 90 is provided in the outer peripheral surface of the holder. Further, in the second embodiment, the support column 32 is provided with a recessed portion 92 for holding the stop auxiliary member formed by the grease 90. Any of the other configurations may be used. In short, since it is sufficient that the grease 90 can be held, it is not limited to the recessed portion 91 or the recessed portion 92, and any structure may be used as long as it holds the stop assisting member. For example, a rough surface structure or the like for holding the grease 90 may be formed. Further, if there is no problem in holding the stop auxiliary member, the structure itself holding the stop auxiliary member may be omitted.

  -In the above-mentioned embodiment, although the stop auxiliary member is formed with grease 90, other composition may be sufficient. Since it is sufficient that the inertia generated by the movement can be suppressed by the sliding contact resistance generated by the sliding contact, a cloth, a fibrous member, rubber, rubber, resin, or the like may be used. However, if the friction is too large, it may hinder the movement of the holder 10, so that a suitable friction can be selected as appropriate.

  In the above embodiment, the lens driving device 1 is mounted on the camera module, but may have other configurations. For example, by mounting on other optical devices such as a telescope, a microscope, and binoculars, an autofocus function can be added to such an optical device.

  In the above embodiment, the camera module is mounted on the mobile phone, but other configurations may be used. It may be a compact digital camera, a digital single-lens reflex camera, or a camera for silver salt photography. It may also be mounted on a digital video camera or film camera for moving image shooting.

  DESCRIPTION OF SYMBOLS 1 ... Lens drive device, 1a ... Lens module, 1b ... Fixed body, 2 ... Filter, 3 ... Image sensor, 4 ... Hall element, 5 ... CPU, 6 ... Driver, 9 ... Cover glass, 10 ... Holder, 11 ... Optical Lens, 12 ... Tube, 13 ... Lens unit, 15 ... Main shaft hole, 16 ... Sub-shaft hole, 20 ... Magnet, 30 ... Base, 31 ... Base, 32 ... Post, 32a ... Object side stopper, 33 ... Opening , 40 ... Cover, 41 ... Through-hole, 51 ... Main shaft, 52 ... Sub shaft, 60 ... Coil, 70 ... Magnetic plate, 81 ... Display part, 82 ... Operation part, 90 ... Grease (stop auxiliary member), 91 ... Recessed portion, 92 ... Recessed portion, 101 ... Lens drive device, 104 ... Hall element, 105 ... CPU, 106 ... Driver, 110 ... Holder, 111 ... Optical lens, 112 ... Lens barrel, 113 ... Lens Knit, 120 ... magnet 130 ... base, 132 ... struts, 160 ... coil, 170 ... magnetic plate, H ... hinges.

Claims (6)

A holder that holds the lens unit and is movable in the direction of the optical axis of the lens unit;
A holder movement stop mechanism for moving and stopping the holder in the optical axis direction;
In the lens driving device provided with a support column provided in the radial direction of the holder and close to the outer peripheral surface of the holder and extending in the optical axis direction,
While being held on the outer peripheral surface of the holder and in sliding contact with the support,
A lens driving device, further comprising: a stop auxiliary member that suppresses inertia generated by the movement and assists the stop by sliding contact resistance generated by the sliding contact. A holder that holds the lens unit and is movable in the direction of the optical axis of the lens unit;
A holder movement stop mechanism for moving and stopping the holder in the optical axis direction;
In the lens driving device provided with a support column provided in the radial direction of the holder and close to the outer peripheral surface of the holder and extending in the optical axis direction,
While being held by the support column and in sliding contact with the outer peripheral surface of the holder,
A lens driving device, further comprising: a stop auxiliary member that suppresses inertia generated by the movement and assists the stop by sliding contact resistance generated by the sliding contact. The lens driving device according to claim 1, wherein the stop assisting member is made of grease. The recessed part for hold | maintaining the said stop auxiliary member formed of the said grease is provided in the outer peripheral surface of the said holder holding the said stop auxiliary member, or the said support | pillar. Lens drive device.   A camera module comprising the lens driving device according to any one of claims 1 to 4.   A mobile phone, wherein the camera module according to claim 5 is mounted.

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