JP2008141798A - Drive mechanism employing piezoelectric element and camera module employing that drive mechanism, and portable terminal equipped with that camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact drive mechanism arranged not to disturb compaction of a camera module by using a piezoelectric element, and also to provide a compact and lightweight camera module. <P>SOLUTION: The camera module comprises a mechanism consisting of a rotary ring 6 having a cam slope 61 and a cam pin (cam follower) 81 abutting against the cam slope 61 in order to move a lens unit 8 in the direction of the optical axis and converting the rotation of the rotary ring 6 into a displacement in the direction of the optical axis, and moves the lens unit 8 in the direction of the optical axis by the mechanism for converting the rotation of the rotary ring 6 into a displacement in the direction of the optical axis by extending the longitudinal direction of a drive member 70, formed by laminating piezoelectric elements extending planarly in the thickness direction, in the tangential direction of the rotary ring 6, bringing a rectangular parallelepiped drive head 707 provided substantially in the center of the drive member 70 into line contact with the rotary ring 6, and rotating the rotary ring 6 in the circumferential direction by performing false circular motion of the drive head 707 in the circumferential direction of the rotary ring 6 by means of the drive member 70. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a driving mechanism using a piezoelectric element, a camera module used in a portable terminal such as a mobile phone using the driving mechanism, and a portable terminal including the camera module, and more particularly, a piezo element (PZT) or the like. The present invention relates to a drive mechanism configured in a small size using a piezoelectric element, a camera module configured in a small size to move a lens in the optical axis direction using the drive mechanism, and a portable terminal including the camera module. is there.

  The camera modules used in portable terminals such as mobile phones are the same as those of ordinary electronic cameras (digital cameras) as the number of pixels of image sensors such as CCD (Charge Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) increases. In addition, high-speed, high-precision autofocus (AF) function and focal length change (zoom) function are required, and the miniaturization and weight reduction of the mobile terminal itself inevitably leads to miniaturization and weight reduction of the camera module. It is desired.

  In a camera module equipped with an autofocus and focal length change (zoom) mechanism, it is necessary to move the lens group in the optical axis direction. For this reason, conventionally, a cylindrical cam or lead screw is driven by a motor, Autofocus and zooming have been realized by moving the focusing lens group and the zoom lens group. However, when a motor is used, an electromagnet or permanent magnet is required around the rotor, and even if the axial length is shortened, the cylindrical part is indispensable. In addition, noise is also generated.

  Therefore, various camera modules that realize such autofocus and zooming using a piezoelectric element such as a piezo element (PZT) as a drive source have been proposed, and the applicant of the present application is also disclosed in Patent Document 1, Patent Document 2, etc. A camera module using a friction drive type drive source using a piezoelectric ceramic (piezo element) has been proposed.

  A friction drive type drive source using a piezoelectric ceramic (piezo element) used in Patent Document 1, Patent Document 2, etc. is, for example, as shown in Patent Document 3, a substantially rectangular plate-shaped piezoelectric ceramic. In the (piezo element), the opposite sides of the first surface formed in the longitudinal direction and the transverse direction are connected to each other and divided into 4 blocks. An electrode is provided for each block and the electrodes arranged in the diagonal direction are wires. In addition, one electrode is provided on the entire second surface opposite to the first surface.

  On the third surface in the short direction, a spacer, which is a relatively hard ceramic operating portion, is attached, for example, in the vicinity of the approximate center of the side by a bonding agent, and engages with a relatively moving object. ing. Further, the piezoelectric ceramic (piezo element) is supported by a pair of support bodies fixed around and a support body with a spring so as to be deformable, and applies a positive voltage to the pair of electrodes arranged in the longitudinal direction on the first surface. When applying a negative voltage to a pair of adjacent electrodes, the side on which the positive voltage is applied is longer than the side on which the negative voltage is applied, and it can be deformed by being supported by a support with a spring. It moves to the side where the negative voltage of the object with which the spacer is engaged is applied.

  When the voltage is no longer applied, the piezoelectric ceramic (piezo element) returns to its original state. At this time, for example, when an asymmetric voltage pulse whose fall time is at least four times longer than the rise time is applied to the electrode, the piezoelectric ceramic. Due to the friction between the spacer and the object in the (piezo element), the spacer returns to the initial position while the spacer and the object are engaged at the fall of the pulse. By repeating this and repeating this, the spacer and the object move in the opposite directions.

  The camera module shown in Patent Document 1 and Patent Document 2 proposed by the applicant of the present application uses a piezoelectric element such as a piezo element (PZT) configured in this way as a drive source. For example, the camera shown in Patent Document 1 In the module, the rotor is attached to a lead screw that is engaged with the lens holder and is provided parallel to the optical axis, and the side surface of the rotor is driven by a piezo element spacer that is also provided parallel to the optical axis. The lens holder can be driven in the optical axis direction.

  Further, in the camera module disclosed in Patent Document 2, the lens holding portion is held so as to be movable in the optical axis direction by a shaft member arranged substantially symmetrically and in parallel with respect to the optical axis, and operates on these shaft members. The longitudinal direction of the piezo element is attached to the lens holding part at a right angle to the optical axis direction so that the part abuts, and the lens holding part is moved relative to the shaft member by driving the piezo element to It can be driven.

  In addition, the friction drive type drive source using the piezoelectric ceramic (piezo element) is not limited to the one shown in Patent Document 3 described above. For example, Patent Document 4 includes two piezoelectric elements. Piezoelectric elements that are arranged so as to be orthogonal to each other and that drive the tip member that contacts the cylindrical surface of the rotatable rotor provided at the intersection of the piezoelectric elements to draw an elliptical locus, thereby rotating the rotor An actuator is shown.

  Further, in Patent Documents 5 and 6, a plate-shaped member such as a piezoelectric material, an electrostrictive material, an antiferroelectric material, or the like that changes its shape when applied with current or voltage is used. The drive member is composed of a connected bent portion and a cylindrical drive pad provided in the center portion, and a rail that extends parallel to the longitudinal direction of the drive member body and is pressed against the drive pad. A near-resonant electromechanical motor is shown in which the traveling wave energy applied to the drive member causes the drive pad to move relative to the rail as the drive pad moves in an elliptical shape.

JP 2006-98575 A JP 2006-98600 A Japanese Patent No. 2980541 JP 2000-139086 A JP 2005-530475 A Pub, no. ; US 2005/0134146

  However, the camera module disclosed in Patent Document 1 includes a lead screw provided parallel to the optical axis and a rotor attached to the lead screw and driven by a spacer of a piezo element. The width or depth of the camera module increases. Further, the camera module disclosed in Patent Document 2 also includes a shaft member that is substantially symmetrical and arranged in parallel with the lens holding portion around the optical axis, and a piezoelectric element in which the operating portion abuts on the shaft member. Existence increases the width or depth of the camera module and prevents further miniaturization. Further, Patent Document 3, Patent Document 4, Patent Document 5, and Patent Document 6 each show only a driving member using a piezoelectric element, but do not indicate a configuration used for a camera module.

  In the near-resonance electromechanical motors disclosed in Patent Document 5 and Patent Document 6, a plate-like member that changes its shape when a current or voltage is applied, such as a piezoelectric material, an electrostrictive material, or an antiferroelectric material. However, attaching a cylindrical drive pad to a plate-shaped member in this way requires an adhesive pool to be considered, and it must be expensive. Absent.

  Therefore, in the present invention, a piezoelectric drive element such as a piezo element (PZT) is used, a small drive mechanism that can be manufactured at a low cost without hindering downsizing of the camera module even when incorporated in a camera module, and the drive mechanism are used. It is an object to provide a small and lightweight camera module configured to move the lens in the optical axis direction and a portable terminal including the camera module.

In order to solve the above problems, the drive mechanism using the piezoelectric element according to the present invention is:
A ring body rotatably supported;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A driving head for transmitting the driving force of the driving member to the ring body;
The drive member has a longitudinal direction extending in a tangential direction of the ring body, and the drive head is provided in a rectangular parallelepiped shape at a substantially longitudinal center of the surface layer of the drive member so as to be in line contact with a tangential portion of the ring body. Arranged,
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring member by the drive member.

  In this way, by making the drive head provided on the drive member extending in the tangential direction in the ring body into a rectangular parallelepiped shape, for example, in the case of a semi-cylindrical shape or semi-elliptical column shape, it is difficult to process, and the piezoelectric element It is necessary to think about adhesion accumulation in the joint part. However, a rectangular parallelepiped shape can be easily processed and can be produced by, for example, molding, and can be easily bonded to the piezoelectric element, so that it can be manufactured at a low cost. In the case of a semi-cylindrical shape or semi-ellipsoidal column shape, the length from the drive head to the ring body must be a semicircle, but if it is a rectangular parallelepiped shape, it is not necessary and can be made smaller, and the length of the drive member If, for example, the length of the optical system used in the camera module is about the same as the outer diameter of the optical system, a drive mechanism that can be configured in a small size can be obtained.

Similarly, in order to solve the above problems, the drive mechanism using the piezoelectric element according to the present invention is:
A ring body rotatably supported;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A drive head for transmitting the drive force of the drive member to the ring body;
Means for converting the rotational movement of the ring body into a displacement in a direction perpendicular to the plane of rotation of the ring body,
The drive member is extended in the tangential direction of the ring body in the longitudinal direction, and the drive head is provided in a rectangular parallelepiped shape substantially at the center in the longitudinal direction of the surface layer of the drive member so as to contact the tangential portion of the ring body. And
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring body by the drive member, and the rotational movement of the ring body is perpendicular to the rotation surface of the ring body. The means for converting the displacement into a displacement of the drive head converts the circumferential pseudo circular motion of the drive head into a displacement in a direction perpendicular to the rotation surface of the ring body.

  If the drive mechanism is configured in this manner, the circumferential pseudo circular motion of the drive head in the drive member can be converted into displacement in a direction perpendicular to the rotation surface of the ring body, and as described above, By making the shape of a rectangular parallelepiped, the drive head can be manufactured inexpensively and compactly, the drive mechanism that converts the rotational movement of the ring body into displacement in the direction perpendicular to the rotating surface is configured inexpensively and compactly. can do.

  The driving head is in line contact with the ring body, or means for converting the rotational motion of the ring body into displacement in a direction perpendicular to the rotational surface of the ring body is provided on the ring surface of the ring body. It is a preferred embodiment of the present invention that a cam slope and a cam follower that comes into contact with the cam slope are used.

In addition, a camera module using such a drive mechanism is
At least one or more optical lenses;
An image sensor on which an optical image is formed by the optical lens;
A ring body supported rotatably about the optical axis of the optical lens;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A drive head for transmitting the drive force of the drive member to the ring body;
Means for converting rotational movement of the ring body into displacement in the optical axis direction of the ring body;
A lens holder fixed to means for converting the rotational movement of the ring body into a displacement in the optical axis direction, and holding the optical lens movably in the optical axis direction;
The drive member is extended in the tangential direction of the ring body in the longitudinal direction, and the drive head is provided in a rectangular parallelepiped shape substantially at the center in the longitudinal direction of the surface layer of the drive member so as to contact the tangential portion of the ring body. And
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring body by the drive member, and the rotational movement of the ring body is changed to the displacement in the optical axis direction in the ring body. The converting means converts the circumferential pseudo-circular movement of the drive head into a displacement in the optical axis direction of the lens holder.

In addition, portable terminals using such camera modules are
At least one or more optical lenses;
An image sensor on which an optical image is formed by the optical lens;
A ring body supported rotatably about the optical axis of the optical lens;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A drive head for transmitting the drive force of the drive member to the ring body;
Means for converting rotational movement of the ring body into displacement in the optical axis direction of the ring body;
A lens holder fixed to means for converting the rotational movement of the ring body into a displacement in the optical axis direction, and holding the optical lens movably in the optical axis direction;
The drive member is extended in the tangential direction of the ring body in the longitudinal direction, and the drive head is provided in a rectangular parallelepiped shape substantially at the center in the longitudinal direction of the surface layer of the drive member so as to contact the tangential portion of the ring body. And
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring body by the drive member, and the rotational movement of the ring body is changed to the displacement in the optical axis direction in the ring body. A camera module that converts a circumferential pseudo-circular movement of the driving head into a displacement in the optical axis direction of the lens holder by means of converting;
A case body to which the camera module is mounted;
It is provided in this case body and has an operation part which operates the camera module.

  By configuring the camera module and the mobile terminal using the camera module in this way, as described above, the circumferential pseudo-circular movement of the drive head in the drive member can be converted into the displacement in the optical axis direction of the ring body. In addition, as described above, since the shape of the drive part is a rectangular parallelepiped shape, it can be manufactured at a low cost. Therefore, the drive mechanism for converting the rotational movement of the ring body into the displacement in the optical axis direction is inexpensive and small. Thus, the camera module and the portable terminal can be made compact.

  The means for converting the rotational motion of the ring body into a displacement in the optical axis direction includes a cam slope provided on the ring surface of the ring body, and a cam follower in which the lens holding body is fixed in contact with the cam slope. The cam follower is pushed by the cam slope at a predetermined position on the lens holder, so that the tilt of the lens with respect to the optical axis is always constant, and the camera module can be easily adjusted with the optical system. .

  The drive head is in line contact with the ring body, the camera module has a guide shaft provided in parallel to the optical axis, the lens holding body has a guide hole, and the guide shaft is fitted, It is configured to be movable in the optical axis direction, and an elastic member is provided on the guide shaft, and it is preferable to apply a biasing force in a direction in which the cam follower fixed with the lens holder is in contact with the cam slope. It is an embodiment.

  The drive member is supported at two points by elastic bodies installed in the vicinity of both ends in the longitudinal direction of the surface opposite to the surface on which the drive head is provided. Pressure is applied, and the camera module includes a wall-like portion provided on each of an inner surface side of the ring body and an outer surface side excluding a contact portion with the drive head of the piezoelectric element, and the wall-like portion. A frame module configured to be connected to the imaging element side member and containing the piezoelectric element, and the ring body is provided with two support portions provided on the opposite side of the driving head in the outer side wall-like portion; The driving head is positioned and rotated by the pressing force applied to the ring body by the elastic body, and the ring body is pressed from the subject side and provided at three locations of the plate spring member. The ring body is supported by the projections provided at the three positions on the ring body side of the image sensor side member of the frame module, and the ring body is positioned in the optical axis direction. It can be easily rotated.

  Further, in this way, the piezoelectric element drive unit in the friction drive type drive source generates dust due to friction with the ring body. However, the camera module has an opening corresponding to the optical lens and has the ring body. A plate-like spring member that covers the piezoelectric element side from the subject side and extends to the imaging element side member in the frame module is provided. Since it is covered with a plate-like spring member extending from the subject side to the imaging element side member in the ring body having an opening corresponding to the wall part, the imaging element side member, and the optical lens position, the ring of the driving unit The dust generated by the friction with the body does not move in the lens direction, and it is possible to prevent the image quality from being deteriorated by the dust.

  As described above, the drive mechanism using the piezoelectric element according to the present invention can form a drive head in a rectangular parallelepiped shape due to the outer shape of the ring body, and the piezoelectric element extends in the tangential direction in the ring body. The rectangular parallelepiped drive head provided on the drive member formed by the element is brought into line contact with the tangential portion of the ring body to drive the ring body, so that the rectangular parallelepiped drive head has a semi-cylindrical shape or a semi-elliptical column shape, for example. Compared to it, the processing is simple, and it is not necessary to consider the adhesion pool at the joint, so it can be created by molding, etc., and it can be easily bonded to the piezoelectric element, and it can be manufactured at a low cost. it can. In the case of a semi-cylindrical shape or semi-ellipsoidal column shape, the length from the drive head to the ring body must be a half circle or a semi-ellipse, but a rectangular parallelepiped shape is not necessary and can be made smaller accordingly. In addition, if the length of the drive member is, for example, the length of the outer diameter of the optical system used in the camera module, the camera module and the portable terminal can be made compact.

  Further, the means for converting the rotational movement of the ring body into the displacement in the optical axis direction is a cam slope provided on the ring surface of the ring body and a cam follower fixed to the lens holding body and in contact with the cam slope. Since the cam follower is pushed by the cam slope at a predetermined position on the lens holder, the tilt of the lens with respect to the optical axis is always constant, and the camera module can be easily adjusted in the optical system.

  In addition, the dust generated by the friction between the drive head and the ring body is covered by the wall-shaped portion, the image sensor side member, and the plate-like spring member at the portion where the ring body contacts the drive head of the drive member. The generated dust does not move in the lens direction, and a camera module and a portable terminal that can prevent image quality from being deteriorated can be obtained.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, shapes, relative arrangements, and the like of the components described in this embodiment are merely illustrative examples, and are not intended to limit the scope of the present invention unless otherwise specified.

  1A is an external perspective view of a camera module according to an embodiment, FIG. 1B is a side view of the camera module viewed from the direction of an arrow 10, and FIG. Hereinafter, the description of the camera module 1 according to the embodiment will be described by taking an autofocus mechanism of the camera module 1 having a single-focus optical lens system as an example. However, the present invention is not limited thereto, and can be applied to a zoom lens or the like. it is obvious.

  In FIG. 1, a camera module 1 is formed in a rectangular shape and has an opening that exposes a lens 2 on its upper surface, and a drive mechanism unit 3 that houses a drive mechanism for moving the lens 2 in the optical axis direction. The sensor cover 4 is configured to house an image pickup device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) and is coupled to the drive mechanism unit 3. In FIG. 1, 5 is a leaf spring (friction plate), 52 is a fixing screw, and 53 is a rotating ring pressing projection, which will be described later.

  FIG. 2 is an exploded perspective view of the camera module 1 according to the embodiment. FIGS. 2A and 2B show exploded views from different directions. Each component of the camera module 1 will be described in order from the top. 51 is cut into a substantially rectangular shape so as to cover the upper surface of the camera module 1 and covers the lens 2 (see FIG. 1) so that dust does not enter. You may provide a hole in the part of the lens 2 as needed with a transparent cover. 5 has a lens opening 54 and extends to cover the rotating ring 6 on the upper surface of the camera module 1 and the piezoelectric element unit 7 provided on the side, and the rotating ring 6 is pressed by a rotating ring pressing protrusion 53 to The unit 7 is fixed while being pressed by the piezoelectric element (driving member) pressing spring 55, and dust generated by friction of the rectangular parallelepiped driving head 707 of the piezoelectric element 70 with the rotating ring 6 cannot be moved to the lens 2 side. A leaf spring (friction plate) 52 is a fixing screw for fixing one end of the leaf spring 5 to the drive mechanism unit 3.

  6 is formed in a ring shape, has a cam slope 61 for moving the lens unit 8 in the optical axis direction on the ring surface, and is a rotating ring rotated by a driving head 707 of the piezoelectric element 70, and 7 is a piezoelectric element unit The piezoelectric element (driving member) 70, the rectangular parallelepiped driving head 707, the flexible substrate 71, the piezoelectric element pad 72, the flexible presser 73, and the like which will be described in detail later. Reference numeral 3 denotes a drive mechanism unit that accommodates the piezoelectric element unit 7 in the piezoelectric element mounting portion 31 and accommodates the lens barrel of the lens unit 8 and is formed in a ring shape. A guide shaft hole 32 for supporting the guide shaft 41 fitted to the guide bearing portion 86 in the lens unit 8 is provided. Reference numeral 4 denotes a sensor cover as described above, and reference numeral 42 denotes a spring that is inserted through the guide shaft 41 and presses the lens unit 8 toward the drive mechanism unit.

  FIG. 3 is a perspective view showing a main part of a drive mechanism using the piezoelectric element 70 used in the camera module 1 according to the embodiment. The drive mechanism according to the embodiment includes a rotation ring 6, a piezoelectric element unit 7, and a lens unit 8 on which a cam pin 81 is erected.

  According to Patent Document 5 and Patent Document 6, the piezoelectric element unit 7 is formed in a plate shape and stacked in the thickness direction, and a semi-cylindrical or semi-elliptical column-shaped drive head is provided in the longitudinal center of the surface layer. In the present invention, a drive head 707 formed in a rectangular parallelepiped shape is used as the drive head. Therefore, before explaining FIG. 3, the structural outline of the piezoelectric element 70 used in the camera module 1 according to the embodiment with reference to FIGS. 8 and 9 and how the piezoelectric element behaves by voltage application. Will be explained.

  In FIG. 8A, reference numeral 70 denotes a piezoelectric element (driving member) in which plate-like piezoelectric elements 701 and 702 are laminated, and a driving head 703 formed in, for example, a rectangular parallelepiped shape is provided at substantially the center in the longitudinal direction of one surface layer. It is done. Reference numerals 704 and 705 denote support portions made of an elastic body for pressing the rectangular parallelepiped drive head 703 against a driven body (not shown).

  Then, Vcc is applied to the entire surface of the piezoelectric element 701 on the side where the rectangular parallelepiped driving head 703 is provided, and the entire surface of the surface of the piezoelectric element 702 on the opposite side is set to Gnd (ground) in the longitudinal direction. When a traveling wave having a phase shifted by π / 2 as shown in (F) is applied to both ends A and B, the piezoelectric element 70 is shown in (B) by the voltage applied to both ends A and B. When A = Vcc and B = Vcc, the rectangular parallelepiped drive head 703 is convex, and when A = Vcc and B = Gnd as shown in FIG. The right side is concave, and when A = Gnd and B = Gnd as shown in (D), the rectangular parallelepiped drive head 703 side is concave, and when A = Gnd and B = Vcc as shown in (E) The rectangular parallelepiped drive head 7 in the figure Left concave than 3, the right is a convex vertex of the rectangular parallelepiped driver head 703 performs pseudo circular motion. Note that the pseudo-circular motion referred to here refers to a motion that draws a similar locus such as an ellipse or a polygon, although it is not a complete circle.

  Therefore, the driven body (not shown) to which the rectangular parallelepiped driving head 703 is pressed is sent to either the left or right side of the figure. For example, as shown in FIGS. 9 (A) and 9 (C), the driven body is driven. When the body is a rotating ring, the rotating ring rotates. In this case, if the traveling wave shift direction shown in FIG. 8F is reversed, the direction of the pseudo circular motion is reversed and the rotation direction of the rotating ring 6 is reversed. When the rectangular parallelepiped drive head 703 is brought into line contact with the driven body, a driving mechanism having a large friction area, a large sliding torque, a small loss of driving force, and a strong holding force at the time of stopping can be obtained. it can. Further, it is possible to obtain a larger effect by increasing the surface roughness of the portion of the rotating ring that contacts the rectangular parallelepiped drive head 703 and increasing the friction coefficient, and the applied traveling wave is not limited to a sine wave, but a rectangular wave, A triangular wave or the like may be used.

  Further, as shown in FIGS. 9A and 9B, if the driving head of the piezoelectric element 70 is a semi-elliptical column-shaped driving head 706 and a semi-cylindrical driving head 708, the processing is difficult, and the piezoelectric element 70 is bonded to the driving head. It is necessary to think about adhesion accumulation in the part. However, as shown in FIGS. 9C and 9D, it can be easily processed when it is formed into a rectangular parallelepiped shape, and can be formed by, for example, mold molding, and can be easily bonded to the piezoelectric element 70, so that it is inexpensive. Can be produced. In the case of the semi-cylindrical drive head 708 and the semi-elliptical prism drive head 706, as shown in FIG. 9B, the length between the drive member provided with the drive head and the rotating ring 6 is a semicircle, Although it must be a half ellipse or more, it is not necessary for a rectangular parallelepiped shape. As can be seen from FIGS. 9B and 9D, the length from the drive member provided with the drive head to the rotating ring 6 is long. The depth of the camera module (vertical length in the figure) can be shortened, and the camera module can be made smaller accordingly.

  Returning to FIG. 3 again, the rotating ring 6 is formed in a ring shape as described above, and has a cam slope 61 for moving the lens unit 8 in the optical axis direction on the ring surface. It is rotated by the head 707. The lens unit 8 is pressed by a spring 42 so that a cam pin (cam follower) 81 abuts a cam slope 61 provided on the rotating ring 6.

  The piezoelectric element 70 has the longitudinal direction described with reference to FIG. 8 as the tangential direction in the rotating ring 6, and the rectangular parallelepiped driving head 707 is brought into contact with the tangential portion, and the rectangular parallelepiped driving head 707 is in the circumferential direction of the rotating ring 6. As described with reference to FIG. 8, the rotating ring 6 is rotated in the circumferential direction by the pseudo circular motion. Then, the rotation of the rotating ring 6 in the circumferential direction displaces the lens unit 8 in the optical axis direction of the lens 2 by the cam slope 61 and the cam pin 81, and the circumferential pseudo-circular movement of the rectangular parallelepiped drive head 707 in the piezoelectric element 70 is It is converted into a displacement in the optical axis direction of the lens 2, that is, a displacement in a direction perpendicular to the rotating surface of the rotating ring 6.

  In this way, the cam pin 81 is pushed by the cam slope 61 at a standing position in the lens unit 8 to displace the lens unit 8 in the optical axis direction, so that the lens 2 is always tilted with respect to the optical axis. The camera module 1 can be made constant and the optical system can be easily adjusted.

  FIGS. 4A and 4B are diagrams for explaining the configuration of the drive mechanism unit 3 using the piezoelectric element used in the camera module according to the embodiment. FIG. 4A is an external perspective view, and FIG. 4B is the rotating ring 6 and the piezoelectric element. FIG. 7C is a perspective view combined with the sensor cover 4 with the leaf spring 5 that covers the drive mechanism unit 3 removed, and FIG. 7C shows the flexible substrate 71 that supplies a signal to the piezoelectric element 70 and the rotating ring 6. (D) is a perspective view in which the rotating ring 6 is added to the state of (C), and (E) is a drawing excluding the rotating ring 6 for explaining the structure for positioning the rotating ring 6 in the drive mechanism unit 3. (F) is a top view in which the rotating ring 6 and the flexible substrate 71 for supplying a signal to the piezoelectric element 70 are added to the state of (E).

  As can be seen from the external perspective view of FIG. 4A, the drive mechanism unit 3 is a leaf spring 5 having a transparent cover 51 (see FIG. 2) on the subject side of the camera module 1 and an opening 54 corresponding to the lens 2. The leaf spring 5 is provided with three protrusions 53 for pressing the rotating ring 6 from the object side. When the drive mechanism unit 3 is combined with the sensor cover 4 as shown in FIG. 4 (B), the piezoelectric element starts from the portion where the piezoelectric element 70 is accommodated in the drive mechanism unit 3 and the sensor cover 4. A dust prevention sheet 56 is affixed so as to prevent dust generated when the rectangular parallelepiped drive head 707 at 70 is rubbed against the rotating ring 6 from going to the lens 2 side.

  FIG. 4B shows a state in which the drive mechanism unit 3 and the sensor cover 4 are combined and the leaf spring 5 is removed as described above, and a rectangular parallelepiped of piezoelectric elements on the inner surface side and outer surface side of the rotating ring 6. Wall portions 391 (inner surface side) and 392 (outer surface side) are formed in a portion excluding the contact portion with the shape driving head 707, and the rotating ring 6 is accommodated therebetween. In the figure, reference numeral 71 denotes a flexible substrate that sends a signal to the piezoelectric element 70, and reference numeral 32 denotes a guide shaft hole through which the guide shaft indicated by 41 in FIG.

  4C is a perspective view in which the flexible substrate 71 and the rotating ring 6 are further removed from the state of FIG. 4B. The piezoelectric element 70 is a piezoelectric element mounting portion provided in the drive mechanism unit 3. 31 is placed while its longitudinal end positions are regulated. A dust absorbing pad 36 is attached to the outer side wall-like portions 392 located on both sides of the rectangular parallelepiped drive head 707 in order to absorb dust generated when the rectangular parallelepiped drive head 707 described below rubs against the rotating ring 6. . In addition, a hole through which a cam pin (cam follower) 81 is inserted is provided in the image pickup element side member connecting the inner wall side wall portion 391 and the outer wall side wall portion 392 in the drive mechanism unit 3, and in FIG. At two places, there are provided rotating ring pressing protrusions 84 for positioning the rotating ring 6 on the image sensor side, which are shown at three places in FIG. In addition, two rotation ring positioning protrusions indicated by 85 in FIG. 4 (E) are provided at two locations on the outer surface side wall-shaped portion 392, and the rotation is performed when the rectangular parallelepiped drive head 707 of the piezoelectric element 70 presses the rotation ring 6. A rotating ring positioning projection 85 supports the opposite side of the ring 6 to position the rotating ring 6.

  4D shows a state in which the rotating ring 6 is fitted in FIG. 4C, and FIG. 4E shows the protrusions 84 and 85 for positioning the rotating ring 6 as described above. FIG. 4F shows a state in which the rotating ring 6 is fitted in the state of FIG. In the figure, reference numeral 72 denotes a piezoelectric element pad provided in between to press the piezoelectric element 70 by the piezoelectric element pressing spring 55 of the leaf spring 5, and 73 denotes a flexible presser for pressing the flexible substrate.

  5A is a cross-sectional view between the leaf spring 5 and the sensor cover 4 at the position indicated by AA ′ in FIG. 1C in the camera module 1 according to the embodiment, and FIG. FIG. 2C is a cross-sectional view of a portion where a piezoelectric element 70 at a position indicated by BB ′ in FIG. 1C is pressed by a leaf spring 55 and a piezoelectric element pad 72. First, in FIG. 5A, 5 is a leaf spring in a state of covering the piezoelectric element unit 7, and a portion indicated by 55 presses the piezoelectric element 70 not shown by cutting. Reference numeral 33 denotes a leaf spring fixing claw that covers the piezoelectric element unit 7 and extends to the image pickup element side of the drive mechanism unit 3 to stop the leaf spring 5. The leaf spring fixing claw 33, the fixing screw 52, Thus, the leaf spring 5 is fixed to the drive mechanism unit 3.

  In FIG. 5B, reference numeral 72 denotes a piezoelectric element pad interposed so as not to damage the piezoelectric element 70 when the piezoelectric element 70 is pressed by the leaf spring 55 as described above. The piezoelectric element pad 72 is provided with the roles of the support portions 704 and 705 made of an elastic body shown in FIG. In addition, 71 is a flexible substrate and 73 is a flexible presser.

  FIG. 6 is a cross-sectional view of the drive mechanism unit 3, the sensor cover 4, and the lens unit 8 in the camera module according to the embodiment described above, and (A) is indicated by CC ′ in FIG. 1 (B). Cross-sectional view of the position, (B) is also a cross-sectional view of the position indicated by DD ′ in FIG. 1 (C), (C) is a cross-sectional view of the position indicated by EE ′ in FIG. 6 (A), (D) is also a cross-sectional view at the position indicated by FF ′ in FIG. 6 (A), and (E) is a partial cross-sectional view at the upper left in the cross-sectional view of FIG. 6 (A).

  First, FIG. 6A shows a mounting state of the piezoelectric element 70, a contact state between the rectangular parallelepiped drive head 707 and the rotating ring 6, and an arrangement state of the guide shaft 41 that moves the lens unit 8 in the optical axis direction. In the figure, a rectangular parallelepiped drive head 707 provided approximately at the center in the longitudinal direction of the piezoelectric element 70 is pressed in the direction of the rotating ring 6 by the leaf spring 55 via the piezoelectric element pad 72.

  Next, FIG. 6B shows a state in which the rectangular parallelepiped drive head 707 of the piezoelectric element 70 is in contact with the rotating ring 6, and the rotating ring 6 is accommodated between the inner surface side wall portion 391 and the outer surface side wall portion 392. It is sectional drawing which showed the state. Here, in the lens unit 8, a lens barrel portion is fitted to the inner surface side wall portion 391, and a portion protruding to the image sensor side member side connecting the inner surface side wall portion 391 and the outer surface side wall portion 392 in the drive mechanism unit 3 is provided. And when that portion comes into contact with the image sensor side member, it is in a state closest to the subject side. Reference numeral 9 denotes a sensor unit, and an IR cut filter 91 for cutting infrared rays is provided on the subject side.

  FIG. 6B shows a state where the lens unit 8 has moved to the most object side. At this time, the cam pin (cam follower) 81 provided on the lens unit 8 is provided on the ring surface of the rotating ring 6. The cam slope 61 is in contact with the most object side. This is shown in FIG. 6 (D). That is, FIG. 6D shows that the optical axis direction height on the left side of the rotating ring 6 is lower than the optical axis direction height on the right side, and that the cam slope 61 is closest to the subject side. ing.

  6C is a sectional view showing the state of the guide shaft 41 and the spring 42 inserted through the guide shaft hole 82 provided in the guide bearing portion 86 in the lens unit 8. As described above, the lens unit 8 has the guide bearing portion 86, and the guide shaft hole 82 is provided in the guide bearing portion 86. Then, the guide shaft 41 provided in the sensor cover 4 is inserted into the guide bearing 86 and the guide shaft hole 32 provided in the drive mechanism unit 3, and the lens unit 8 is connected to the drive mechanism unit by the spring 42 provided therebetween. The lens unit 8 can move in the direction of the optical axis while being pressed against the third side.

  FIG. 6E shows a state in which the piezoelectric element 70 is pressed by a piezoelectric element pressing spring 55 (see FIG. 2) provided on the leaf spring 5. As described with reference to FIG. 2, the leaf spring 5 is a piezoelectric element unit placed on the rotating ring 6 on the upper surface of the camera module 1 and the piezoelectric element placement portion 31 provided on the side of the drive mechanism unit 3. 7 is extended to the image sensor side of the drive mechanism unit 3, but a notch is provided at the position of the piezoelectric element unit 7 as shown by 55, and thereby a spring portion that presses the piezoelectric element 70 is provided. Is formed.

  Therefore, the piezoelectric element 70 is pressed to the rotating ring 6 side by the piezoelectric element pressing spring 55 provided on the leaf spring 5 through the piezoelectric element pad 72 provided on the opposite side to the rectangular parallelepiped drive head 707. The rotating ring 6 is positioned in contact with the rotating ring positioning projection 85 shown in FIG. 4E, and rotates as described above by the pseudo circular motion of the rectangular parallelepiped drive head 707. In FIG. 6E, 86 is a guide bearing provided in the lens unit 8 as described above for inserting the guide shaft 41 provided in the sensor cover 4, and 71 is a flexible substrate. .

  7A is a top view showing a structure for positioning the rotating ring excluding the rotating ring and a dust absorbing pad. FIG. 7B is an enlarged view of the upper right part of FIG. Sectional drawing which showed the path | route in the case of going out, (C) is sectional drawing of the position shown by GG 'in FIG. 7 (A).

  In the drive mechanism unit 3 of the camera module 1 according to the embodiment, dust is generated when the rectangular parallelepiped drive head 707 provided on the piezoelectric element 70 frictionally drives the rotating ring 6 by a pseudo circular motion. If the dust is left unattended, it moves to the lens 2 side to degrade the image quality, or enters between the lens barrel of the lens unit 8 and the inner wall side wall portion 391 to move the lens unit 8 in the optical axis direction. It is necessary to prevent this in some way to prevent it.

  Therefore, as described above, the rectangular parallelepiped drive head 707 of the piezoelectric element 70 is rubbed against the rotating ring 6 so as to cover the rotating ring 6 on the upper surface of the camera module 1 and the piezoelectric element unit 7 provided on the side portion. A leaf spring (friction plate) 5 is provided to prevent the generated dust from going to the lens 2 side, and this leaf spring 5 moves around the rectangular parallelepiped drive head 707. I can't prevent you from doing it.

  For this reason, in the camera module according to the embodiment, the image pickup element side member that connects the inner surface side wall portion 391 and the outer surface side wall portion 392 is provided with a dust absorbing pad made of, for example, double-sided tape as shown by 35, and further the outer surface Dust absorbing pads 36 and 37 that are also made of double-sided tape or the like are provided on both sides of the rectangular parallelepiped drive head 707 in the side wall portion 392 and the lens side of the piezoelectric element mounting portion 31 in the drive mechanism unit 3. Dust generated by these is absorbed.

  Further, as described above, the leaf spring 5 covers the rotating ring 6 on the upper surface of the camera module 1 and the piezoelectric element unit 7 provided on the side so that dust does not go to the lens 2 side. The piezoelectric element pressing spring 55 provided on the leaf spring 5 is cut, and as shown in FIG. 7B, dust generated by the contact between the rectangular parallelepiped drive head 707 and the rotating ring 6 is dotted. There is a possibility that the piezoelectric element pressing spring 55 passes through the dust path 38 shown in FIG.

  For this reason, the dust that has come out between the drive mechanism unit 3 and the sensor cover 4 in the dust path 38 is not between the drive mechanism unit 3 and the sensor cover 4 of the camera module 1 so that the dust does not go to the lens 2 side. The dust prevention sheet 56 is provided, and a dust prevention tape 57 is provided between the leaf spring 5 and the flexible substrate 71. 7C is a cross-sectional view of the position indicated by GG ′ in FIG. 7 so that the notch of the piezoelectric element pressing spring 55 that presses the piezoelectric element 70 can be clearly seen. In addition, the cut portion of the piezoelectric element pressing spring 55 that presses the piezoelectric element 70 via the piezoelectric element 70 is shown in a state of being whitened.

  The above is the configuration of the drive mechanism using the piezoelectric element 70 of the embodiment and the camera module 1 using the drive mechanism, but as can be seen from the above description, the rectangular parallelepiped drive in the drive member using the piezoelectric element 70. The circumferential quasi-circular motion of the head 707 relative to the rotating ring 6 can be converted into a displacement in the optical axis direction of the lens unit 8 by a cam slope 61 and a cam pin (cam follower) 81 provided on the rotating ring 6. The lens module 2 in the camera module 1 can be moved in the optical axis direction with a simple configuration.

  FIG. 10 is a diagram showing a mobile phone 100 as an example of a mobile terminal in which the camera module 1 described above is incorporated. 10A shows a state in which the display unit 101 is closed and the camera 103 can be seen, and FIG. 10B shows a state in which the display unit 101 can be opened and the operation button 111 provided on the operation unit 110 can be operated. .

  In the figure, reference numeral 102 denotes a first display device that displays various types of information when the operation button 111 provided on the operation unit 110 is in the state (B), and 104 is an operation button as shown in FIG. Reference numeral 112 denotes a second display device that notifies an incoming mail or the like when 111 is in an inoperable state, and 112 is a hinge mechanism for opening and closing the display unit 101 and the operation unit 110. Among these, the display part 101 and the operation part 110 each comprise a case body.

  The display unit 101 is provided with a hole for exposing the lens 2 of the camera module 1 described above at a position indicated by 103, and the main body of the camera module 1 is accommodated therein. Then, when a predetermined operation button 111 of the operation unit 110 is operated, the camera module 1 captures an image, and the captured image is displayed on the first display device 102, for example. Although not shown, the operation unit 110 houses a battery, a communication unit, and the like, and the thickness of the display unit 101 is substantially regulated to the height of the camera module 1.

  As described above, according to the present embodiment, the driving mechanism that drives in the lens optical axis direction can be configured to be small and inexpensive, and the camera module that can be configured to be small and lightweight, and the portable terminal including the camera module are provided. Can be provided.

(A) of the camera module which becomes embodiment is an external appearance perspective view, (B) is the side view seen from the arrow 10 direction, (C) is a top view. It is the disassembled perspective view seen from the different direction of the camera module which becomes embodiment. It is the perspective view which showed the principal part of the drive mechanism using the piezoelectric element used for the camera module which becomes embodiment. (A) is an external perspective view of a drive mechanism unit using a piezoelectric element used in the camera module according to the embodiment, and (B) is a rotary ring and a piezoelectric element, and a leaf spring that covers the drive mechanism unit is removed. The perspective view which combined with the sensor cover part in the state, (C) is the perspective view except the flexible substrate which supplies a signal to a piezoelectric element, and the rotation ring in a drive mechanism unit, (D) is a rotation ring in the state of (C) (E) is a top view excluding the rotating ring for explaining the structure for positioning the rotating ring in the drive mechanism unit, and (F) is a signal to the rotating ring and the piezoelectric element in the state of (E). It is the top view which added the flexible substrate which supplies. FIGS. 1A and 1B are cross-sectional views in the optical axis direction of the camera module according to the embodiment, and FIG. 1C is a cross-sectional view at the position indicated by AA ′; FIG. It is sectional drawing of the position shown by '. In the camera module according to the embodiment, (A) is a cross-sectional view of the position indicated by CC ′ in FIG. 1 (B), and (B) is also the position indicated by DD ′ in FIG. 1 (C). Sectional view, (C) is a sectional view at the position indicated by EE ′ in FIG. 6 (A), (D) is a sectional view at the position indicated by FF ′ in FIG. ) Is a partial cross-sectional view of the upper left portion of the cross-sectional view of FIG. It is the figure which showed the dust absorption structure of the dust which arises when the drive head provided in the piezoelectric element in the drive mechanism unit of the camera module which becomes embodiment carries out friction drive of the rotation ring, and (A) rotates except a rotation ring. FIG. 6B is a top view showing the structure for positioning the ring and the dust-absorbing pad, and FIG. 6B is a cross-sectional view showing the path when the dust comes out of the drive mechanism unit by enlarging the upper right part in FIG. ) Is a cross-sectional view taken along the line GG ′ in FIG. It is a figure for demonstrating the structure outline of the piezoelectric element (driving member) which comprises the drive mechanism using the piezoelectric element which becomes embodiment, and how a piezoelectric element behaves by voltage application. FIG. 5 is a diagram for explaining a difference in the shape of a drive head in contact with a rotating ring in a piezoelectric element that constitutes a drive mechanism using a piezoelectric element according to an embodiment, in which (A) and (B) are semi-cylindrical shapes , (C), (D) is a case of a rectangular parallelepiped shape. It is a figure which shows schematically the form telephone as an example of the portable terminal with which the camera module of embodiment was incorporated.

Explanation of symbols

2 Lens 3 Drive Mechanism Unit 31 Piezoelectric Element Placement Section 32 Guide Shaft Hole 33 Plate Spring Fixing Claw 34 Cam Pin Hole 391 Inner Side Wall Side Part 392 Outer Side Wall Side Part 4 Sensor Cover 41 Guide Shaft 42 Spring 5 Plate Spring (Friction Plate)
51 Transparent Cover 52 Fixing Screw 53 Rotating Ring Pressing Projection 54 Lens Opening 55 Piezoelectric Element Pressing Spring 6 Rotating Ring 61 Cam Slope 7 Piezoelectric Element Unit 70 Piezoelectric Element (Drive Member)
707 Rectangular drive head 71 Flexible substrate 72 Piezoelectric element pad 73 Flex holder 8 Lens unit 81 Cam pin (cam follower)
82 Guide shaft hole 84 Rotating ring pressing projection 85 Rotating ring positioning projection 86 Guide bearing 9 Sensor unit

Claims (14)

A ring body rotatably supported;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A driving head for transmitting the driving force of the driving member to the ring body;
The drive member has a longitudinal direction extending in a tangential direction of the ring body, and the drive head is provided in a rectangular parallelepiped shape at a substantially longitudinal center of the surface layer of the drive member so as to be in line contact with a tangential portion of the ring body. Arranged,
A drive mechanism using a piezoelectric element, characterized in that the ring body is rotated or rotated in the circumferential direction by the drive head that performs a pseudo-circular movement in the circumferential direction of the ring body by the drive member. A ring body rotatably supported;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A drive head for transmitting the drive force of the drive member to the ring body;
Means for converting the rotational movement of the ring body into a displacement in a direction perpendicular to the plane of rotation of the ring body,
The drive member is extended in the tangential direction of the ring body in the longitudinal direction, and the drive head is provided in a rectangular parallelepiped shape substantially at the center in the longitudinal direction of the surface layer of the drive member so as to contact the tangential portion of the ring body. And
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring body by the drive member, and the rotational movement of the ring body is perpendicular to the rotation surface of the ring body. A drive mechanism using a piezoelectric element characterized in that, by means for converting to a displacement, a pseudo-circular movement in the circumferential direction of the drive head is converted into a displacement in a direction perpendicular to the rotation surface of the ring body.   The drive mechanism using a piezoelectric element according to claim 2, wherein the drive head is in line contact with the ring body.   The means for converting the rotational motion of the ring body into displacement in a direction perpendicular to the rotational surface of the ring body is a cam slope provided on the ring surface of the ring body and a cam follower that contacts the cam slope. A drive mechanism using the piezoelectric element according to claim 2 or 3. At least one or more optical lenses;
An image sensor on which an optical image is formed by the optical lens;
A ring body supported rotatably about the optical axis of the optical lens;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A drive head for transmitting the drive force of the drive member to the ring body;
Means for converting rotational movement of the ring body into displacement in the optical axis direction of the ring body;
A lens holder fixed to means for converting the rotational movement of the ring body into a displacement in the optical axis direction, and holding the optical lens movably in the optical axis direction;
The drive member is extended in the tangential direction of the ring body in the longitudinal direction, and the drive head is provided in a rectangular parallelepiped shape substantially at the center in the longitudinal direction of the surface layer of the drive member so as to contact the tangential portion of the ring body. And
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring body by the drive member, and the rotational movement of the ring body is changed to the displacement in the optical axis direction in the ring body. A camera module characterized in that the means for converting converts the circumferential pseudo circular motion of the driving head into a displacement in the optical axis direction of the lens holder.   Means for converting the rotational movement of the ring body into a displacement in the optical axis direction includes a cam slope provided on a ring surface of the ring body, a cam follower fixed to the lens holding body in contact with the cam slope, The camera module according to claim 5, wherein:   The camera module according to claim 5, wherein the drive head is in line contact with the ring body.   The camera module has a guide shaft provided in parallel to the optical axis, and the lens holder has a guide hole so that the guide shaft is fitted and can be moved in the optical axis direction. The camera module according to claim 5.   9. The camera module according to claim 8, wherein an elastic member is provided on the guide shaft, and an urging force is applied in a direction in which a cam follower on which the lens holder is fixed is brought into contact with the cam slope.   The drive member is supported at two points by elastic bodies installed in the vicinity of both ends in the longitudinal direction of the surface opposite to the surface on which the drive head is provided, and has a pressing force in a direction in which the drive head is brought into contact with the ring body. The camera module according to claim 5, wherein the camera module is provided. The camera module includes a wall-like portion provided on each of an inner surface side of the ring body and an outer surface side excluding a contact portion with the driving head of the piezoelectric element, and an image sensor side member connecting the wall-like portions. A frame module configured to accommodate the piezoelectric element;
The ring body is positioned by two support portions provided on the opposite side of the drive head in the outer wall side wall portion and the pressing force of the drive head applied to the ring body by the elastic body. The camera module according to claim 10, wherein the camera module can be rotated.   The camera module is provided with a plate-like spring member having an opening corresponding to the optical lens, covering the piezoelectric element side from the subject side in the ring body and extending to the imaging element side member in the frame module. The camera module according to claim 11, wherein:   The ring body is pressed between the projections provided at three locations of the plate-like spring member and the projections provided at three locations on the ring body side of the imaging element side member of the frame module. The camera module according to claim 12, wherein the ring body is positioned in the optical axis direction. At least one or more optical lenses;
An image sensor on which an optical image is formed by the optical lens;
A ring body supported rotatably about the optical axis of the optical lens;
A driving member formed by laminating piezoelectric elements extending in a plate shape in the thickness direction;
A drive head for transmitting the drive force of the drive member to the ring body;
Means for converting rotational movement of the ring body into displacement in the optical axis direction of the ring body;
A lens holder fixed to means for converting the rotational movement of the ring body into a displacement in the optical axis direction, and holding the optical lens movably in the optical axis direction;
The drive member is extended in the tangential direction of the ring body in the longitudinal direction, and the drive head is provided in a rectangular parallelepiped shape substantially at the center in the longitudinal direction of the surface layer of the drive member so as to contact the tangential portion of the ring body. And
The ring member is rotated or rotated in the circumferential direction by the drive head that performs pseudo-circular movement in the circumferential direction of the ring body by the drive member, and the rotational movement of the ring body is changed to the displacement in the optical axis direction in the ring body. A camera module that converts a circumferential pseudo-circular movement of the driving head into a displacement in the optical axis direction of the lens holder by means of converting;
A case body to which the camera module is mounted;
A portable terminal comprising an operation unit provided on the case body and operating the camera module.