JP2008065093A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent transmission of vibration of a nut to a lens frame in a lens drive device that has a lead screw and the nut. <P>SOLUTION: The lens drive device includes: a base 10; a drive source 40 fixed to the base; the lead screw 50 rotated by the drive source; a lens frame 30 holding a lens G and supported on the base so as to be freely movable in the optical axis direction L; and the nut 60 helically engaged with the lead screw and abuts on the lens frame in the optical axis direction. In the nut 60, its circumferential edges (two rotation stop projections 62a) are partially engaged with the wall face part 14 of the base 10 so as not to be rotatable. This prevents transmission of vibration from the nut to the base to the utmost. Accordingly, transmission of vibration from the base to the lens frame is surely prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens driving device that drives a lens frame holding a lens in an optical axis direction by a screw feed structure by screwing a lead screw and a nut.

  Conventional lens driving devices include a base (or case), a lens frame holding a lens, a guide shaft fixed to the base for guiding the lens frame in the optical axis direction, a motor fixed to the base, and a direct connection to the motor. A lead screw that is driven to rotate, a nut that is held in a non-rotatable manner with respect to the lens frame, a coil spring that urges the nut toward the lens frame, etc. In addition, there is known one in which the lens frame is moved in the optical axis direction by screw-feeding the nut (see, for example, Patent Document 1 and Patent Document 2).

However, in the above-described conventional apparatus, in order to stop the rotation of the nut, the rotation stopper (projection) protruding from the nut is directly engaged with the stopper (groove having the receiving surface) of the lens frame. The nut rotation stopper collides against the lens frame stopper due to load fluctuations due to assembly tolerances between nuts, processing tolerances of screw parts (male threads, female threads), or the rotational driving force of the motor and its reaction. There was a problem that a rattling phenomenon was repeatedly generated, and the lens frame vibrates in a direction perpendicular to the optical axis.
As a result, in an optical pickup unit for a CD or DVD to which this apparatus is applied, the optical axis of the lens fluctuates when the lens frame is moved in the optical axis direction while reading or writing data on the disk. There was a problem of causing a tracking error.

JP 2005-24968 A JP 2005-173442 A

  The present invention has been made in view of the above circumstances, and the object of the present invention is from a drive mechanism (drive source, lead screw, nut) while simplifying the structure and reducing the size of the apparatus. An object of the present invention is to provide a lens driving device that can prevent vibration from being transmitted to the lens frame and can stably drive the lens frame (lens) with high accuracy in the optical axis direction.

The lens driving device of the present invention includes a base, a driving source fixed to the base, a lead screw that is rotationally driven by the driving source, a lens frame that holds the lens and is supported movably in the optical axis direction with respect to the base, A lens driving device comprising a nut screwed to a lead screw and abutting against a lens frame in the optical axis direction, wherein the nut is locally engaged with an outer peripheral edge portion of the nut so as not to rotate. It is characterized by that.
According to this configuration, when the lead screw is rotated by the rotational driving force of the drive source, the nut is locally engaged with the base, and the screw is fed in the direction of the optical axis while the rotation is restricted, and follows this nut. The lens frame moves in the optical axis direction.
Here, since the outer peripheral edge of the nut is locally engaged with the base in a non-rotatable manner, in the vibration transmission path of drive source → lead screw → nut → base → lens frame, the nut to the base Transmission of vibration can be prevented as much as possible, and as a result, transmission of vibration from the base to the lens frame can be reliably prevented.
Therefore, the lens frame (lens) moves stably in the optical axis direction without vibrating. As a result, when this lens driving device is mounted on an optical pickup unit or the like, the optical axis does not fluctuate even during driving of the lens, and tracking errors and the like are prevented (the focus is kept constant) for recording or reproduction. Can be performed with high accuracy.

In the above configuration, the nut is formed in a substantially rectangular shape and has two anti-rotation protrusions protruding at the outer peripheral edge thereof, and the base has a wall surface portion for sliding the two anti-rotation protrusions in the optical axis direction. The configuration can be adopted.
According to this configuration, the nut can be locally engaged with the base in a non-rotatable manner only by slidably abutting the two anti-rotation protrusions formed on the outer peripheral edge of the nut with the wall surface of the base. In addition, since the wall surface part is provided integrally with the base, the number of parts is not increased, the structure is simplified, the assembly is facilitated, the cost is reduced, the device is downsized, etc. Can be achieved.

The said structure WHEREIN: The rotation prevention protrusion of a nut can employ | adopt the structure currently formed so that it may extend | expand in an optical axis direction.
According to this configuration, since the rotation stop protrusion is a protrusion extending in the optical axis direction, the nut can be smoothly moved in the optical axis direction while preventing the nut from falling or tilting while restricting the rotation of the nut. Screw can be fed.

In the above-described configuration, a configuration in which the wall surface portion of the base is formed on a flat surface parallel to the optical axis direction so that the two rotation stop protrusions can be brought into contact with each other simultaneously can be adopted.
According to this configuration, the distance between the nut and the base can be narrowed, and downsizing of the device can be achieved by consolidating the components, and the two rotation-preventing projections of the nut are provided on the flat surface (wall surface portion) of the base. On the other hand, since contact is made from the same direction in a plane perpendicular to the optical axis, vibration transmission can be efficiently suppressed or prevented.

In the above configuration, the base has two anti-rotation protrusions that extend in the optical axis direction and project in a direction perpendicular to the optical axis, and the nut is formed in a substantially rectangular shape and contacts the two anti-rotation protrusions of the base. A configuration having an outer peripheral edge portion in contact with the outer peripheral edge portion can be employed.
According to this configuration, the nut can be locally engaged with the base in a non-rotatable manner simply by slidably abutting the outer peripheral edge of the nut with the two anti-rotation protrusions formed on the base. In addition, since the rotation stop protrusion is provided integrally with the base, the structure is simplified, the assembly is easy, the cost is reduced, and the size of the device is reduced without increasing the number of parts. it can.

The said structure WHEREIN: The outer peripheral part of a nut can employ | adopt the structure currently formed in the flat surface parallel to an optical axis direction so that it may contact | abuts two rotation stop protrusions simultaneously.
According to this configuration, the distance between the nut and the base can be reduced, and the size of the apparatus can be reduced by consolidating the components. ) In the same direction in the plane perpendicular to the optical axis, vibration transmission can be efficiently suppressed or prevented.

The said structure WHEREIN: The structure currently formed so that a rotation stop protrusion may make a substantially semicircle or the curved cross section is employable.
According to this configuration, the nut and the base can be linearly contacted, and the nut (that is, the lens frame) can be moved in the optical axis direction while suppressing the contact area between the nut and the base as much as possible (while engaging locally). Smooth screw feed.

In the above configuration, the lens frame may have a contact portion that contacts the nut from one direction in the optical axis direction, and a spring that exerts a biasing force to press the contact portion against the nut. .
According to this configuration, the nut, the lens frame, and the spring can be easily and reliably assembled to the base, and the structure that prevents the vibration of the lens frame is adopted, and the productivity of the apparatus is improved. Can be made.

  According to the lens driving device configured as described above, vibration is transmitted from the driving mechanism (driving source, lead screw, nut) to the lens frame through the base while achieving simplification of the structure and size reduction of the device. Thus, it is possible to obtain a lens driving device that can stably drive the lens frame (lens) with high accuracy in the optical axis direction.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 5 show an embodiment of a lens driving device according to the present invention. FIG. 1 is an exploded perspective view of the device, FIG. 2 is a side view of the device, and FIG. 3 is a cross-sectional view of the device. 4 is a perspective view and a plan view showing a nut forming a part of the apparatus, and FIG. 5 is a cross-sectional view of the apparatus viewed from the optical axis direction.

  As shown in FIGS. 1 to 3, this apparatus holds a base 10, two guide shafts 20 fixed to the base 10 and extending in the optical axis direction L, a lens G, and moved in the optical axis direction L by the guide shaft 20. A lens frame 30 supported freely, a motor 40 as a drive source fixed to the base 10, a lead screw 50 directly connected to the motor 40 and extending in the optical axis direction L, and screwed into the lead screw 50 and the lens frame 30. A nut 60 abutted on the lens, a spring 70 for urging the lens frame 30 toward the nut 60, a detection sensor 80 for detecting an initial position of the lens frame 30, and the like.

  As shown in FIGS. 1 to 3 and 5, the base 10 is molded into a half base 10 a and a half base 10 b using a resin material, and the motor 40 is fixed through the lead screw 50. Fixed portion 11, receiving portion 12 for receiving one end of spring 70 in contact, fitting hole 13 for fitting both ends of guide shaft 20, wall surface portion 14 extending substantially in the optical axis direction L, detection A mounting portion 15 for mounting the sensor 80 is provided. The two half bases 10a and 10b are coupled by screws B.

Here, as shown in FIGS. 1, 2, and 5, the wall surface portion 14 is formed on a flat surface parallel to the optical axis direction L, and slides on two rotation prevention protrusions 62 of a nut 60 described later. The nut 60 is brought into contact freely, and the nut 60 is locally engaged so as not to rotate.
That is, the nut 60 can be locally engaged with the base 10 in a non-rotatable manner simply by slidably abutting two rotation stop protrusions 62 (to be described later) of the nut 60 against the wall surface portion 14 of the base 10.
Further, since the wall surface portion 14 is provided integrally with the base 10, it does not require a dedicated part for rotation prevention, simplifies the structure, facilitates assembly, reduces cost, Miniaturization can be achieved.

  As shown in FIGS. 1 to 3, the two guide shafts 20 are formed to extend in the optical axis direction L by a metal material having a circular cross section, and both ends thereof are fitted in the fitting holes 13 of the base 10. It is mated. One guide shaft 20 guides the lens frame 30 in the optical axis direction L, the other guide shaft 20 guides the lens frame 30 in the optical axis direction L, and the lens frame 30 rotates around the optical axis L. Is regulated.

  The lens frame 30 is formed of a resin material, and as shown in FIGS. 1 to 3 and 5, the lens frame 30 is formed integrally with the annular portion 31 and the annular portion 31 that hold the lens G at one end of a cantilever shape. The nut 60 is brought into contact with the contact portion 32 that defines the through-hole 32a through which the lead screw 50 passes, and the guide shaft 20 is slidably fitted on both sides so as to sandwich the contact portion 32. The connecting portions 33 and 34 to be connected, a spring receiving portion 35 formed at the end of the connecting portion 33, a detection piece 36 that extends from the vicinity of the connecting portion 33 and is detected by the detection sensor 80, and the like. .

  The motor 40 is a stepping motor that can rotate step by step at a predetermined angle, and is fixed to the fixing portion 11 of the base 10 by a screw B. The motor 40 exerts a rotational driving force on the directly connected lead screw 50.

  As shown in FIGS. 1 to 3, the lead screw 50 is formed by a metal material so as to extend in the optical axis direction L, and a female screw 61 of a net 60 described later extends over a predetermined region of the outer peripheral surface thereof. And a male screw 51 to be screwed together.

As shown in FIGS. 1 to 5, the nut 60 is formed in a substantially rectangular shape by a metal material, and has a female screw 61 that is screwed into the male screw 51 of the lead screw 50 and a flat surface parallel to the optical axis direction L. Two anti-rotation protrusions that are formed on the ridges that project radially outward from both edges of the outer surface 62 and the outer surface 62 (that is, the outer peripheral edge of the nut 60) and extend in the optical axis direction L. 62a, an end face 63 that contacts the contact portion 32 of the lens frame 30, and the like.
The two anti-rotation protrusions 62a are formed so that the cross section thereof is substantially semicircular or curved, and extend in the optical axis direction L and line-contact with the wall surface portion 14 of the base 10.
The nut 60 is held in contact with the contact portion 32 in a state where the outer peripheral surface (outer peripheral edge portion) thereof is not in contact with the lens frame 30 (the wall surface defining the contact portion 32 thereof). ing.

As described above, since the two anti-rotation protrusions 62a are formed on the outer peripheral edge portion of the nut 60, the nut 60 can be locally rotated on the base only by slidingly contacting the wall surface portion 14 of the base 10. It is possible to achieve a simple structure, easy assembly, low cost, miniaturization of the apparatus, and the like.
In particular, since the two rotation stop projections 62a are formed on the protrusions so as to extend in the optical axis direction L, while restricting the rotation of the nut 60, while preventing the nut 60 from falling or tilting, The nut 60 to be screwed can be smoothly guided in the optical axis direction L.

Further, since the two anti-rotation protrusions 62a are formed so as to have a substantially semicircular or curved cross section, the nut 60 and the base 10 can be brought into linear contact with each other, and the contact area between the two is minimized. Thus, the frictional resistance can be reduced, and the nut 60 (that is, the lens frame 30) can be smoothly screwed in the optical axis direction L.
Further, since the two anti-rotation protrusions 62a are formed so as to be in contact with the wall surface portion 14 (flat surface) of the base 10 at the same time, the interval between the nut 60 and the base 10 can be narrowed. Miniaturization can be achieved, and the two anti-rotation protrusions 62a of the nut 60 abut against the wall surface portion 14 (flat surface) of the base 10 from the same direction in the plane perpendicular to the optical axis L. Therefore, vibration transmission can be efficiently suppressed or prevented.

  As shown in FIGS. 1 and 3, the spring 70 is a compression type coil spring formed in a coil shape. One end of the spring 70 is engaged with the spring receiving portion 35 of the lens frame 30, and the other end is accommodated in the base 10. It is engaged with the portion 12 (the bottom wall) and attached in a compressed state at a predetermined compression allowance. Therefore, the spring 70 urges the lens frame 30 toward one side in the optical axis direction L, and exerts an urging force that presses the contact portion 32 of the lens frame 30 against the nut 60 (the end surface 63 thereof).

  The detection sensor 80 is a transmissive optical sensor having a light emitting element and a light receiving element, and detects the initial position (home position) of the lens frame 30 based on the presence or absence of the detected piece 36 of the lens frame 30. .

Next, the assembly of the apparatus will be briefly described. First, the guide shaft 20 is fitted and fixed in the fitting holes 13 of the half base 10a, and the lens frame 30 is fixed to the guide shaft 20 while compressing the spring 70. To be slidably fitted.
Subsequently, the motor 40 directly connected to the lead screw 50 is arranged to be fixed to the fixing portion 11 of the base 10, and the nut 60 is brought close to the lead screw 50 from above the contact portion 32 to be screwed into the lead screw 50.

Then, the other ends of the guide shafts 20 are fitted to the half base 10b, and the half bases 10a and 10b and the motor 40 are integrally fastened with screws B.
At this time, the two rotation stop protrusions 62a of the nut 60 are slidably engaged in the optical axis direction L with respect to the wall surface portion 14 of the half base 10b.
Further, the detection sensor 90 is assembled and fixed to the mounting portion 15 of the half body base 10b. Thereby, the assembly of the apparatus is completed.

  Thus, in assembling the apparatus, as shown in the exploded perspective view of FIG. 1, in the optical axis direction L, the base 40, the guide shaft 20, the lens frame 30, and the motor 40 directly connecting the lead screw 50, the nut 60. By simply preparing and fitting the spring 70, the entire nut can be easily and reliably assembled while making the nut 60 non-rotatable. Therefore, the assembly work of the apparatus can be performed easily and quickly, and the productivity can be improved.

Next, the operation of this apparatus will be described.
First, when the lens frame 30 is positioned at one side (initial position) in the optical axis direction L, the detection sensor 80 detects the detected piece 36.
When the motor 40 rotates in the forward direction, the lead screw 50 rotates, and the two anti-rotation protrusions 62a are slidably guided only in the optical axis direction L while being non-rotatably engaged with the wall surface portion 14 of the base 10. The nut 60 moves toward the other side in the optical axis direction L by a screw feeding action.
Then, due to the contact between the nut 60 and the contact portion 32, the lens frame 30 moves toward the other side in the optical axis direction L together with the nut 60 while resisting the biasing force of the spring 70.
Then, the number of steps from the start of the motor 40 is counted, and the driving amount of the lens frame 30 is appropriately controlled to position the lens frame 30 at a desired position.

On the other hand, when the motor 40 rotates in the reverse direction, the lead screw 50 rotates, and the two rotation-preventing projections 62a are slidably guided only in the optical axis direction L while being non-rotatably engaged with the wall surface portion 14 of the base 10. The nut 60 moves toward one side in the optical axis direction L by a screw feeding action.
Then, since the nut 60 is always brought into contact with the contact portion 32 by the biasing force of the spring 70, the lens frame 30 follows the nut 60 (together with the nut 60) in one of the optical axis directions L. It moves toward and is positioned at a desired position by appropriately controlling the driving amount, and further moves to one side to return to the initial position.

  In this driving operation, even if the nut 60 generates minute vibrations due to load fluctuations due to processing tolerances of the male screw 51 and the female screw 61, the rotational force and reaction force of the lead screw 50, etc., the nut 60 And is not engaged with the lens frame 30 in the direction perpendicular to the optical axis L, so that the minute vibrations can be prevented or suppressed from being transmitted to the base 10. Therefore, it is possible to reliably prevent the minute vibration from being transmitted from the base 10 to the lens frame 30.

That is, according to this apparatus, the structure is simplified and reduced in size, and the vibration is transmitted from the nut 60 to the base 10 in the vibration path of the motor 40 → the lead screw 50 → the nut 60 → the base 10 → the lens frame 30. As a result, it is possible to reliably prevent the vibration from being transmitted from the base 10 to the lens frame 30.
Therefore, the lens frame 30 (lens G) moves stably in the optical axis direction L without vibrating. As a result, when this apparatus is mounted on an optical pickup unit or the like, the optical axis L does not fluctuate even while the lens G is being driven, and tracking errors or the like are prevented (the focal point is kept constant), and recording or reproduction is performed. Can be performed with high accuracy.

6 and 7 are an exploded perspective view and a cross-sectional view showing another embodiment of the lens driving device according to the present invention. Omitted.
In this apparatus, as shown in FIGS. 6 and 7, the base 10 ′ (half body base 10 b ′) extends in the wall surface portion 14 ′ in parallel to the optical axis direction L and is perpendicular to the optical axis L. Are integrally provided with two anti-rotation protrusions 14a.

  Since the two anti-rotation protrusions 14a 'are formed so as to have a substantially semicircular or curved cross section, the nut 60' and the base 10 'can be brought into linear contact with each other, and the contact area between the two is minimized. Accordingly, the frictional resistance can be reduced, and the nut 60 '(that is, the lens frame 30) can be smoothly screwed in the optical axis direction L.

  As shown in FIGS. 6 and 7, the nut 60 ′ is formed in a substantially rectangular shape so as to define a female screw 61, an outer surface 62 ′ as a flat surface, and an end surface 63. And both edge part 62a 'of outer side surface 62' functions as an outer-periphery edge part contact | abutted to the two rotation stop protrusion 14a of base 10 '.

  Therefore, the nut 60 'is made non-rotatable to the base 10' only by slidably contacting the two edge portions 62a '(outer peripheral edge portion) of the nut 60' with the two rotation stop projections 14a 'of the base 10'. Since the rotation stop projection 14a 'is provided integrally with the base 10', the structure can be simplified and assembled without increasing the number of parts. Simplification, cost reduction, and downsizing of the apparatus can be achieved.

  Further, both edge portions 62a ′ (outer peripheral edge portions) of the nut 60 ′ are formed on a flat surface parallel to the optical axis direction L so as to be in contact with the two rotation stopper projections 14a ′ at the same time. The distance between the 60 'and the base 10' can be narrowed, and the apparatus can be reduced in size by consolidating the parts. Further, the two anti-rotation protrusions 14a 'of the base 10' are provided on the outer surface 62 of the nut 60 '. Since it abuts on the ′ (outer peripheral edge portion) from the same direction in the plane perpendicular to the optical axis L, vibration transmission can be efficiently suppressed or prevented.

In this apparatus as well, as described above, the nut 60 ′ is achieved in the vibration transmission path of the motor 40 → the lead screw 50 → the nut 60 ′ → the base 10 ′ → the lens frame 30 while achieving simplification and downsizing of the structure. Transmission of vibration from the base 10 'to the base 10' can be prevented as much as possible, and as a result, transmission of vibration from the base 10 'to the lens frame 30 can be reliably prevented.
Therefore, the lens frame 30 (lens G) moves stably in the optical axis direction L without vibrating. As a result, when this apparatus is mounted on an optical pickup unit or the like, the optical axis L does not fluctuate even while the lens G is being driven, and tracking errors or the like are prevented (the focal point is kept constant), and recording or reproduction is performed. Can be performed with high accuracy.

In the above-described embodiment, one lens frame 30 is shown as a lens frame that moves in the optical axis direction L. However, the present invention is not limited to this, and the present invention can be applied to a configuration including a plurality of lens frames. it can. In that case, the wall surface part 14 or the rotation stop protrusion 14a ′ of the bases 10 and 10 ′ may be shared, or may be provided for each lens frame.
In the above-described embodiment, the case where the spring 70 is employed to bring the abutment portion 32 of the lens frame 30 into contact with the nuts 60 and 60 ′ is not limited to this, but the nuts 60 and 60 ′ are not limited thereto. The present invention can also be applied to a configuration in which the lens frame 30 is provided with a structure that sandwiches the lens from both sides in the optical axis direction L and the spring 70 is eliminated.

  In the above embodiment, the wall surface portion 14 of the base 10 that engages the two rotation stop protrusions 62a of the nut 60 is formed on a flat surface, and the nut that engages the two rotation stop protrusions 14a 'of the base 10'. Although the case where the outer peripheral edge portion of both 60 '(both edge portions 62a' of the outer side surface 62 ') is formed on a flat surface has been shown, the present invention is not limited to this and can restrict the rotation of the nuts 60 and 60'. If so, the two anti-rotation protrusions 62a and 14a 'may be engaged with each other in a shape other than flat.

  As described above, the lens driving device of the present invention can prevent vibration from being transmitted from the nut to the lens frame through the base while achieving simplification and downsizing of the structure. Of course, the present invention is applicable to other lens optical systems as long as it is necessary to prevent the vibration of the lens frame itself.

It is a disassembled perspective view which shows one Embodiment of the lens drive device which concerns on this invention. It is a side view of the lens drive device shown in FIG. It is sectional drawing of the lens drive device shown in FIG. FIG. 2 shows a nut included in the lens driving device shown in FIG. 1, (a) is a perspective view thereof, and (b) is a plan view thereof. It is sectional drawing which looked at the lens drive device shown in FIG. 1 from the optical axis direction. It is a disassembled perspective view which shows other embodiment of the lens drive device which concerns on this invention. It is sectional drawing which looked at the lens drive device shown in FIG. 6 from the optical axis direction.

Explanation of symbols

L Optical axis direction 10, 10 ′ Base 10 a, 10 b, 10 b ′ Half body base 11 Fixing portion 12 Housing portion 13 Fitting hole 14, 14 ′ Wall surface portion 14 a ′ Anti-rotation protrusion 15 Mounting portion 20 Guide shaft 30 Lens frame 31 Annular Part 32 Contact part 32a Through hole 33, 34 Connecting part 35 Spring receiving part 36 Detected piece 40 Motor (drive source)
50 Lead screw 51 Male screw 60, 60 'Nut 61 Female screw 62, 62' Outer side surface (outer peripheral edge)
62a Anti-rotation protrusion (outer peripheral edge)
62a 'both edges (outer peripheral edge)
63 End face 70 Spring 80 Detection sensor

Claims (8)

A base, a drive source fixed to the base, a lead screw that is rotationally driven by the drive source, a lens frame that holds the lens and is supported so as to be movable in the optical axis direction with respect to the base, and a screw on the lead screw A lens driving device including a nut that contacts the lens frame in the optical axis direction,
The outer periphery of the nut is locally engaged with the base so as not to rotate,
A lens driving device. The nut has two anti-rotation protrusions that are formed in a substantially rectangular shape and project at the outer peripheral edge thereof,
The base has a wall surface portion that slides the two rotation stop protrusions in the optical axis direction.
The lens driving device according to claim 1. The rotation stop protrusion of the nut is formed to extend in the optical axis direction,
The lens driving device according to claim 2. The wall surface of the base is formed on a flat surface parallel to the optical axis direction so that the two anti-rotation protrusions are in contact with each other at the same time.
The lens driving device according to claim 2 or 3, wherein The base has two anti-rotation protrusions extending in the direction of the optical axis and protruding in a direction perpendicular to the optical axis,
The nut is formed in a substantially rectangular shape and has an outer peripheral edge portion that comes into contact with the two rotation stop protrusions.
The lens driving device according to claim 1.   The outer peripheral edge portion of the nut is formed on a flat surface parallel to the optical axis direction so as to simultaneously contact the two rotation stop protrusions. The rotation stop protrusion is formed to have a substantially semicircular or curved cross section,
The lens driving device according to claim 3, wherein the lens driving device is a lens driving device. The lens frame has a contact portion that contacts the nut from one direction of the optical axis direction,
A spring that exerts an urging force to press the abutting portion against the nut;
The lens driving device according to claim 1, wherein the lens driving device is a lens driving device.

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