JP3808496B2 - Camera module and portable terminal using the camera module - Google Patents

Description

  The present invention relates to a camera module, and more particularly, to a small and lightweight camera module and a portable terminal equipped with the camera module.

  In general, a camera module has an autofocus (AF) function and a zoom function. For example, a cylindrical cam is disposed on the side surface of an optical lens, and the zoom lens frame and the AF lens frame are arranged by the cylindrical cam. In this case, a cylindrical cam bearing and a lens frame bearing are arranged on the front cover (fixed frame). A solid-state imaging device (CCD) is directly disposed on the housing (case), a cam for detecting the rotation angle is arranged on the side surface of the cylindrical cam, and the rotation angle of the cylindrical cam is detected by a mechanical switch. (See Patent Document 1).

  In addition, there is an AF lead screw and a zoom lead screw arranged at the corner on one side of the case so that the movable lens group of the zoom lens system can be moved along the lead screw. When moving the photographic optical system in the optical axis direction by driving the cam, the cam region for normal magnification photographing and the cam region for macro photography are continuously formed on the cam, and this cam is driven by a step motor. Here, there is a stepping motor in which a cylindrical cam is arranged adjacent to the lens frame by so-called tele and macro two-point switching, and the AF lens frame and the zoom lens frame are driven by this cylindrical cam. Is disposed on the side of the cylindrical cam.

  In addition, a lead screw is integrally provided in the stepping motor, the lead screw is held by the holding member independently together with the stepping motors 22a and 22b, and an attachment member for attaching these holding members to the box 11 which is the lens barrel base body, There is one that is arranged only on one side with respect to the lead screw. Here, the zoom and AF lens frame is driven by two lead screws, and the guide support portion of the lens frame is provided in the housing, and the housing A CCD is arranged at the bottom.

  In addition, it has a focus motor and zoom motor for driving the photographic lens, and a shutter motor and aperture motor for driving the internal mechanism, and a plane perpendicular to the optical axis of the photographic lens is orthogonal to the optical axis and orthogonal to each other. These motors are arranged in the first to fourth quadrants divided by the first axis and the second axis, respectively, so that the center of rotation of the focus motor and the zoom motor passes through the base of the shutter unit. Some have a notch.

  Also, a plurality of slide molds in which the movable lens is driven in the optical axis direction by a screw shaft and a bearing portion that rotatably holds the screw shaft in the apparatus body is integrally formed by molding, and the bearing portion has a different sliding direction. Therefore, in this example, the zoom and AF lens frame is driven by two lead screws, and the bearing of the two lead screws and the two lens frame guide shafts are performed by the upper housing. The CCD is held in the lower housing.

  By the way, in recent camera modules used for mobile terminals such as mobile phones, high-speed, high-precision autofocus (with a high-resolution solid-state image pickup device (CCD)) as with a normal electronic camera (digital camera) ( AF) function and focal length change (zoom) function are required, and further, the miniaturization and weight reduction of the mobile terminal itself inevitably requires a reduction in the size and weight of the camera module.

  In order to change the autofocus and the focal length in such a camera module, it is necessary to move the lens group in the optical axis direction. Therefore, conventionally, an electromagnetic motor or a pulse motor having a rotor is used. The lens group is moved in the optical axis direction by driving a helicoid mechanism, a cam ring, a lead screw, or the like.

  However, the electromagnetic motor using the above rotor requires an electromagnet and a permanent magnet around the rotor, and a cylindrical portion is indispensable even if the axial length is shortened. It becomes a bottleneck in making it.

  Therefore, it has been proposed to use a piezo element as a drive source. For example, one end of a multilayer piezoelectric body is fixed to a protrusion on the outer peripheral surface of a lens holding frame, and one end of a bimorph piezoelectric body is fixed to the other end of the piezoelectric body. In addition, another bimorph piezoelectric body 4 is fixed to the opposite side of the projection, and these bimorph piezoelectric bodies are bent when the voltage is turned on, and the clamp between the engagement member at the tip and the inner surface of the lens barrel is removed. When the voltage is turned off, it returns to its original shape and is clamped to the lens barrel. The laminated piezoelectric element expands when the voltage is turned on, returns to its original length when the voltage is turned off, and alternately clamps the bimorph piezoelectric material. There is one in which the body is extended and restored to move the lens forward and backward (see Patent Document 2).

  In addition, there is a piezoelectric element that is disposed close to a rotary feed member for feeding a lens holding frame, and this piezoelectric element gives an incremental rotation to the rotary feed member. The lens frame is arranged in contact with the circumference of the end of the feed screw for driving the lens frame (see Patent Document 3).

  In addition, two types of piezoelectric elements are integrally attached to a guide member that guides the lens holding frame, and these piezoelectric elements are alternately expanded and contracted to cause an intermittent feed operation to the guide member. Here, the piezoelectric element is disposed at the end of the feed screw for driving the lens holding frame (see Patent Document 4).

  In addition, an electromechanical energy conversion element (piezoelectric element) that vibrates when an electric signal is applied is brought into contact with an output member having a screw portion, and the output member is rotated by vibration of the conversion element. There is one that moves the moving member in the axial direction of the output member along with the rotation of the screw part by bringing the moving member into contact with the screw part, and here, around the cylindrical part at the end of the feed screw A piezoelectric element is disposed (see Patent Document 5).

  In addition, a sleeve portion integral with the lens barrel is slidably fitted to the guide bar, and a vibrator of a linear drive type vibration wave actuator is pressed against the outer peripheral surface of the sleeve portion with a leaf spring, so that the piezoelectric element is predetermined. There is one in which two alternating voltages of the above phase difference are applied, axial thrust is applied to the sleeve portion, and the lens barrel is moved along the optical axis (see Patent Document 6).

  For each moving lens frame, one ceramic vibrator is arranged in either the moving lens frame or the fixed portion (lens barrel) of the lens device, and the ceramic vibrator is not arranged. There is a type in which a ceramic vibrator is pressed against a part of either the moving lens frame or the fixed portion, and the lens is driven by an elliptical motion of the ceramic vibrator ceramic vibrator.

  Further, as shown in FIG. 21, a lens holding frame 211 is screwed into a screw portion 231A of a drive shaft 231 provided so as to be rotatable about an axis so that a vibrating body 301 including a piezoelectric element is arranged around the drive shaft 231. In some cases, the driving shaft 231 is rotated by the vibration of the vibrating body 301 in contact with the surface to drive the lens holding frame 211 forward and backward along the axial direction of the driving shaft 231.

  In addition, as shown in FIG. 22, the piezoelectric vibrator 1 is pressed against the guide shaft member 6 by the leaf spring 3, and the piezoelectric vibrator 1 is housed in the sleeve portion of the movable lens holding member 5, thereby rotating the motor. There is a type in which a lens driving device is reduced in size by eliminating a transmission member for conversion into linear motion to improve space efficiency.

  The drive source using a piezo element (piezoelectric element) is low speed, but has high torque, excellent response and controllability, can be positioned very finely, and has a holding torque (or holding force) when not energized, quietness And has advantages such as being small and light. And as a drive source using a piezo element, for example, it is provided with at least one rectangular piezoelectric plate 10 having a long edge part and a short edge part and first and second faces, Attach the electrode and attach a ceramic spacer to the center of the first edge of the edge, and apply elastic force to the center of the second edge opposite to the first edge to attach the ceramic spacer to the object There is one in which either an alternating current or an asymmetric single-pole pulse voltage is applied to the electrode (see Patent Document 7).

  Further, as a driving source using a piezoelectric element, first and second long sides, first and second short sides, front and back surfaces surrounded by long and short sides, a plurality of electrodes connected to the front surface, and A first piezoelectric plate having a counter electrode connected to the back surface is provided, and is connected to the front and back surfaces surrounded by the first and second long sides, the first and second short sides, the long side and the short side, and the front surface. A second piezoelectric plate having a plurality of electrodes and a counter electrode connected to the back surface, the first spacer being attached to the first long side at one end near the first short side of the first piezoelectric plate, The second spacer is attached to the first long side at one end near the first short side of the second piezoelectric plate and engaged with the surface of the object, and each spacer is pressed against the surface of the object, An excitation voltage is applied to the plurality of electrodes, and the first short side of the first piezoelectric plate is moved to the second pressure. The first short side of the plate is that so as to substantially parallel to and close (see Patent Document 8).

  In addition, it has a piezoelectric plate with a spacer attached to one of the two long edge portions, two short edge portions, and the long edge portion as a driving source using a piezo element, and can rotate around the axis. At least one arm, and the arm is provided with first and second ends provided at both ends thereof spaced apart from the axis, a read / write head attached to the first end of the arm, and a second There is a structure in which a rigid member is provided on the end portion, and a spacer of the piezoelectric plate is elastically biased by the rigid member so that the piezoelectric plate is movable with respect to the axis (see Patent Document 9). .

  Similarly, as a drive source using a piezo element, a plurality of electrodes are provided on one surface of the piezoelectric plate, a counter electrode is provided on the other surface, a head is provided at one end of an arm that can be swung around an axis, There is one in which a rigid body is provided at the other end so that the piezoelectric plate is elastically biased toward the rigid body (see Patent Document 10).

  Further, as a driving source using a piezo element, the piezo element moves in the first direction when a voltage is applied between the first electrode group and the common electrode, and between the second electrode group and the common electrode. When a voltage is applied to the first and second electrode groups, the first electrode group and the second electrode group are connected to a low voltage by a switch so as to selectively move in the first or second direction. (See Patent Document 11).

In addition, as a driving source using a piezo element, the vibrator has a rectangular parallelepiped shape formed of a plurality of thin layers made of piezoelectric material, and this layer has the same first and second relatively large square mains. The main surface is defined from a long end surface and a short end surface, the layers are stacked and the main surfaces are bonded together, the electrode is on the surface of the layer, and the contact region is one or more of the layers There is one which is arranged on an end face and applies a voltage to an electrode in order to excite vibration in a contact region (see Patent Document 12).
JP 7-63970 A Japanese Patent Laid-Open No. 5-107440 Japanese Patent Laid-Open No. 4-291213 JP-A-4-221910 JP-A-8-47273 JP-A-7-104166 JP 7-184382 A Japanese Patent No. 2980541 JP 9-37575 A JP 2000-40313 A Special table 2002-529037 gazette Special table 2003-501988 gazette

  By the way, since a camera module used for a mobile terminal such as a mobile phone is always required to be downsized, the drive mechanism must be downsized to be applied to such a mobile terminal. Even if a piezo element is used, the lens holding member and the piezo element exist independently, and the lens holding member is moved by a slider. There is a problem that it becomes complicated.

  In view of the above circumstances, an object of the present invention is to provide a camera module that can be configured to be small and light even if an autofocus (AF) function and a zoom function are incorporated using a piezoelectric element.

In order to solve the above problems, a camera module according to the present invention is arranged in a first lens holding portion that holds at least one optical lens and is movable in the optical axis direction, and the first lens holding portion. A first guide bearing portion, a first bearing portion arranged in the first lens holding portion, and the first guide bearing portion are brought into contact with each other to guide the first lens holding portion so as to be movable. And a guide shaft member arranged in parallel with the optical axis and a guide for movably moving the first lens holding portion in the optical axis direction along the guide shaft member by being inserted through the first bearing portion. A shaft member that receives a driving force by a first piezo element disposed in the piezo holding part of the first lens holding part, and a first member that has elasticity and presses and fixes the first piezo element to the piezo holding part. A pressing portion that presses the first piezo element extending in a direction substantially orthogonal to the optical axis to the first fixing member in a predetermined direction, and disposed in the first lens holding portion. A first position detecting member, and a locking portion that locks with the first lens holding portion disposed at a position substantially opposite to the pressing portion , wherein the first lens holding portion includes: The first guide bearing portion and the first bearing portion are disposed at substantially opposing positions, and the pressing portion of the first fixing member and the first position detecting member are substantially opposed to each other. It is arranged in.

  In the present invention, the piezo holding unit holds the first piezo element by contacting two opposing side surfaces of the first piezo element. Further, the piezo holding portion is provided with a lightening portion on a side surface other than the two abutting portions.

  In the present invention, the piezo holding part includes an insertion part through which the first piezo element can be inserted from a direction substantially orthogonal to the optical axis, and the first fixing member is inserted into the insertion part. Press the end of the piezo element. The first fixing member is made of a conductive member and includes an insulating member disposed at a position substantially opposite to the side surface of the first piezo element. The first fixing member includes an optical lens retaining member for the first lens holding portion.

  In the present invention, a first wiring member that supplies current to the first piezo element is included, and a groove for positioning the first wiring member is provided in the first lens holding portion.

  In the present invention, the insertion portion, the first guide bearing portion, the pressing portion, and the first position detecting member are respectively arranged at positions corresponding to the four corners of the first lens holding portion. .

  In the present invention, a second lens holding portion that holds at least one optical lens and is movable in the optical axis direction, and is arranged at a position coaxial with the first guide bearing portion of the first lens holding portion. A second guide bearing portion, a second bearing portion arranged coaxially with the first bearing portion of the first lens holding portion, and a second piezoelectric element having elasticity and a piezoelectric holding portion. And a second fixing member that presses and fixes the second lens holding portion to the optical axis direction along the guide shaft member by inserting the shaft member into the second bearing portion. In addition, the driving force is received by the second piezo element disposed in the piezo holding portion of the second lens holding portion.

  The present invention further includes a first wiring member for energizing the first piezo element and a second wiring member for energizing the second piezo element, and the first lens holding portion is disposed on the subject side. In addition, the second lens holding portion is disposed on the imaging side, the first wiring member is configured by a flexible member, and the first wiring member is disposed on the subject side of the first lens holding portion. A folded portion is arranged, the second wiring member is made of a flexible member, and the folded portion of the second wiring material is arranged on the image forming side of the second lens holding portion.

  The present invention has a substantially cubic shape having at least four side surfaces substantially parallel to the optical axis, guides the first lens holding portion and the second lens holding portion movably, and is parallel to the optical axis. A shaft member disposed at the end of the first piezoelectric element, a first actuating portion in contact with a side surface of the shaft member disposed at an end of the first piezoelectric element, and the shaft disposed at an end of the second piezoelectric element. A second actuating portion in contact with a side surface of the member, the first piezo element and the second piezo element are disposed on a first side surface corresponding to a predetermined surface, and the shaft member is The guide shaft member is disposed in the vicinity of the first corner of the cube on the side surface of the first side, and the guide shaft member is disposed at the other corner facing the first corner.

  In the present invention, the first piezo element and the second piezo element have a substantially rectangular plate shape, and the first piezo element has a longitudinal direction parallel to a direction substantially orthogonal to the optical axis. And the second piezo element is held by the second lens holding portion in a state in which the longitudinal direction is parallel to the direction substantially orthogonal to the optical axis. Yes.

According to the present invention, a first lens holding portion that holds at least one or more optical lenses and is movable in the optical axis direction, a first guide bearing portion disposed in the first lens holding portion, The first lens holding portion disposed in the first lens holding portion and the first guide holding portion abuts the first lens holding portion so as to be movable and arranged in parallel with the optical axis. The first lens holding portion is guided through the guide shaft member and the first bearing portion so as to be movable in the optical axis direction along the guide shaft member, and the first lens holding portion. A shaft member that receives a driving force by a first piezo element disposed in the piezo holding part, a first fixing member that has elastic force and presses and fixes the first piezo element to the piezo holding part, 1 fixed member is almost straight to the optical axis It arranged a pressing portion that presses the first piezo element extending in a direction in a predetermined direction, a first position detecting member disposed in the first lens holding portion, in a position substantially opposite to the pressing portion A locking portion that locks with the first lens holding portion, and the first lens holding portion is a position that substantially faces the first guide bearing portion and the first bearing portion. A camera module, an operation member, a display member, a battery, and a communication unit, which are arranged at positions where the pressing portion of the first fixing member and the first position detecting member are substantially opposed to each other. And a housing that houses the camera module, the display member, the battery, and the communication unit and that has a thickness dimension limited to the height of the camera module.

As described above, in the present invention, the first guide bearing portion is disposed in the first lens holding portion, the first bearing portion is disposed in the first lens holding portion, and the first lens is further disposed. When the first piezo element is disposed in the piezo holding portion of the holding portion and the shaft member is inserted into the first bearing portion, the shaft member passes the first lens holding portion along the guide shaft member in the optical axis direction. The first piezo element is guided by the first piezo holding part of the first lens holding part and guided by the first piezo holding part. At this time, the first piezo element is moved by the first fixing member having elastic force. Since the first fixing member is pressed and fixed to the holding portion, the first fixing member presses the first piezoelectric element extending in a direction substantially orthogonal to the optical axis in a predetermined direction, and the first lens holding portion. a first position detecting member disposed, the pressing portion substantially facing position Further comprising a, a locking portion for locking said first lens holding portion disposed in the first lens holding portion includes a first guide bearing portion and the first bearing portion in a substantially opposite position The first lens holding portion is moved along the shaft member and the guide shaft member because the pressing portion of the first fixing member and the first position detecting member are disposed substantially opposite to each other. Therefore, there is an effect that the camera module when the auto focus (AF) function and the zoom function are incorporated can be configured to be small and light.

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

  FIG. 1 is an exploded perspective view showing an example of an image pickup device assembly (image pickup unit) used in the camera module according to the first embodiment of the present invention. As shown in FIG. A digital signal processor (DSP) 12 is mounted on the other surface of the CCD substrate 11 so as to face the CCD 10. The CCD substrate 11 is covered with a CCD cover 13 from the CCD 10 side, and an infrared (IR) blocking filter 113a is attached to the opening surface of the CCD cover 13 to form an imaging device assembly (hereinafter referred to as a CCD assembly) 14. .

  FIG. 2 is a perspective view showing the lens holder (first lens holding portion) used in the camera module according to Embodiment 1 of the present invention together with the optical lens. As shown, the lens holder 15 (first lens holding portion) is shown. ) Defines an optical lens storage space, and at least one optical lens 16 is held in the optical lens storage space. The lens holder 15 is formed in a substantially square shape when viewed from above, and a pair of corner portions facing each other are formed with a bearing portion 15a and a guide bearing portion 15b that are directed upward from below in the drawing. In addition, a drive element holding portion (piezo holding portion) 15c into which a drive element portion 17 described later is inserted is formed along the side on the bearing portion 15a side. Although not shown in FIG. 2, an insertion portion (hole) communicating with the bearing portion 15a is formed in the piezo holding portion 15c.

  Referring to FIG. 3, after mounting optical lens 16 on lens holder 15 as described above, drive element portion 17 is disposed on piezo holding portion 15c. The drive element portion 17 has a substantially rectangular plate-like piezo element 18, and the piezo element 18 has electrodes on a first surface 18 a formed in the longitudinal direction and the short-side direction, and on a second surface 18 b on the opposite side. (Not shown) and a spacer (actuating portion) 18d for engaging with an object to be moved relative to the third surface 18c in the short direction is provided, and provided on the first surface 18a and the second surface 18b. By applying a sinusoidal voltage to the electrodes, a reciprocating motion is generated in the operating portion 18d, thereby realizing a relative movement with respect to the object with which the operating portion 18d is engaged.

  The piezo element 18 will be described in more detail with reference to FIG. 4. The piezo element 18 is formed in a substantially rectangular plate-like outer shape in FIG. 4A as described in detail in Patent Documents 7 to 12. As shown in FIG. 4 (b), four electrodes 181, 182 and 183, 184 are provided on the first surface 18a formed in the longitudinal direction and the short direction of the piezoelectric ceramic (piezo element) 18 thus formed. One electrode is provided on the entire second surface 18b on the opposite side. The electrodes 181, 182, 183, and 184 on the first surface 18 a are composed of electrodes 181, 182, and 183, 184 arranged in a diagonal direction by wires 185 and 186 arranged in the vicinity of the connecting portions of the respective electrodes. It is preferable that the electrodes are electrically connected and the electrode on the second surface 18b is grounded.

  Further, a spacer 18c as a relatively hard ceramic operating portion is attached to the third surface 18c in the short direction, for example, by a bonding agent, preferably near the center of the side, and moved relatively. The contact member 161 such as a shaft member or a wall surface is engaged. Further, as shown in FIG. 4B, the piezoelectric ceramic (piezo element) 18 includes a pair of supports 171 and 172 fixed around the vibration node and a support with an elastic member such as a spring. 173, 174 and 175 are supported so as to be deformable.

  When a positive voltage is applied to the electrodes 181 and 184 and a negative voltage is applied to the electrodes 182 and 183 in the piezoelectric ceramic (piezo element) 18 configured as described above, the piezoelectric ceramic (piezo element) 18 is shown in FIG. ), The left side of the figure is longer than the right side, and the vibration nodes are supported by the support bodies 173, 174, and 175 with springs, so that the spacer 18d is engaged. The object 161 moves to the right. When the voltage is no longer applied, the piezoelectric ceramic (piezo element) 18 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 18d and the object 161 in the (piezo element) 18, the spacer 18d returns to the starting position while the spacer 18d and the object 161 are engaged at the time of the fall of the pulse. And the object 161 move relatively. When the voltage is applied in the reverse direction, the piezoelectric ceramic (piezo element) 18 is deformed in the opposite direction, and thus the spacer 18d and the object 161 move in the opposite directions.

  In this way, the piezoelectric ceramic (piezo element) 18 applies a signal voltage that continuously causes the deformation shown in FIG. 4C, so that the friction between the spacer 18d and the object 161 causes the relative relation to the object 16. Displacement of the general position, low speed but high torque, excellent response and controllability, fine positioning possible, holding torque (or holding force) when no current is applied, excellent quietness, The drive source has advantages such as small size and light weight.

  Referring again to FIG. 3, a bifurcated leaf spring member 19 is disposed on the upper surface of the piezoelectric element 18, and a wiring material (flexible wiring) 20 is connected to the piezoelectric element 18. The wiring member 20 is folded at a folded portion indicated by reference numeral 20a, and the folded portion 20a is positioned on the subject side of the lens holder 15 as will be described later.

  As shown in FIGS. 2 and 3, in the piezo holding portion 15 c, the surface opposite to the bearing portion 15 a is opened and the upper surface side is also opened, and a partition portion 15 d for separating the opposite surface and the upper surface is provided. It has been. As shown by solid line arrows in FIG. 3, when the piezo element 18 is inserted into the piezo holding portion 15c from the operating portion 18d side, the piezo element 18 is inserted into the piezo holding portion 15c with the leaf spring member 19 straddling the partition portion 15d. The Then, the operating portion 18d passes through the insertion portion and faces into the bearing portion 15a.

  Subsequently, the fixing member 21 is attached to the lens holder 15 from the direction indicated by the solid line arrow in FIG. The fixing member 21 has an elastic force and includes a ring-shaped main body portion 21a. The main body portion includes a first pressing portion 21b, a locking piece portion 21c, and a second pressing portion 21d extending in an arm shape. Have. When the fixing member 21 is attached to the lens holder 15, the leaf spring member 19 is pressed downward by the first pressing portion 21b, and the rear end of the piezo element 18 (on the side opposite to the operating portion 18d) by the second pressing portion 21d. End) is pressed toward the bearing portion 15a. Then, the locking piece 21 c is locked to the lens holder 15 and the main body 21 a is locked to the lens holder 15. At this time, the fixing member 21 prevents the optical lens 16 attached to the lens holder 15 from coming off. The fixing member 21 may be formed of a conductive material, and the insulating member 21e may be disposed at a position facing the side surface of the piezo element 18.

  Referring to FIG. 5, as described with reference to FIG. 3, after assembling the lens assembly (first lens assembly) 22, the RF plate 22 a is attached to the lens holder 15. FIGS. 6A and 6B are perspective views showing the lens assembly 22 after mounting the RF plate 23 from different angles, and the lens holder 15 has a groove 24 for positioning the wiring member 20. A part of the wiring material 20 is accommodated in the groove 24, and the wiring material 20 is positioned. A sensor tape (not shown) as a position detection member is attached to the lens holder 15.

  Referring to FIG. 7, FIG. 7 is an exploded perspective view showing a lens assembly (second lens assembly) 25. The lens assembly 25 includes a lens holder 26 (second lens holding portion). This lens holder 26 has the same structure as the lens holder 15 except for the standing portion 26e. That is, the lens holder 26 defines an optical lens storage space, and at least one optical lens 27 is held in the optical lens storage space. A pair of corner portions of the lens holder 26 facing each other are formed with a bearing portion 26a and a guide bearing portion 26b that are directed upward from below in the drawing. In addition, a drive element portion holding portion (piezo holding portion) 26c into which a drive element portion 28 described later is inserted is formed along the side on the bearing portion 26a side. Although not shown in FIG. 7, an insertion portion communicating with the bearing portion 26a is formed in the piezo holding portion 26c.

  As described with reference to FIGS. 2 and 3, after the optical lens 27 is mounted on the lens holder 26, the drive element unit 28 is disposed on the piezo holding unit 26c. The drive element unit 28 includes a piezo element 29 similar to the piezo element 18, a bifurcated leaf spring member 30 is disposed on the upper surface of the piezo element 29, and a wiring material (flexible wiring) is provided on the piezo element 29. ) 31 is connected. The wiring member 31 is folded at a folded portion indicated by reference numeral 31a, and the folded portion 31a is positioned on the imaging side of the lens holder 26, as will be described later.

  As shown in FIG. 7, in the piezo holding portion 26c, a surface opposite to the bearing portion 26a is opened and an upper surface side is also opened, and a partition portion 26d is provided for separating the opposite surface and the upper surface. . As shown by a solid line arrow in FIG. 7, when the piezo element 29 is inserted into the piezo holding part 26c from the operating part 29a side, the piezo element 29 is inserted into the piezo holding part 26c with the leaf spring member 30 straddling the partition part 26d. The And the action | operation part 29a faces in the bearing part 26a through an insertion part.

  Subsequently, the fixing member 32 is attached to the lens holder 26 from the direction indicated by the solid line arrow in FIG. The fixing member 32 has a structure similar to that of the fixing member 21, and the fixing member 32 includes a ring-shaped main body portion 32a. The main body portion 32a includes a first pressing portion 32b, a locking piece portion 32c, And a second pressing portion 32d extending in an arm shape. When the fixing member 32 is attached to the lens holder 26, the leaf spring member 30 is pressed downward by the first pressing portion 32b, and the rear end of the piezo element 29 (on the side opposite to the operating portion 29a) by the second pressing portion 32d. End) is pressed toward the bearing portion 26aa. Then, the locking piece 32 c is locked to the lens holder 26 and the main body 32 a is locked to the lens holder 26. At this time, the fixing member 32 prevents the optical lens 27 attached to the lens holder 26 from coming off. The lens holder 26 is provided with a standing portion 26e, and a sensor tape 33 for position detection is attached to the standing portion 26e. The fixing member 32 may be formed of a conductive material, and the insulating member 32e may be disposed at a position facing the side surface of the piezo element 29.

  Referring to FIG. 8, FIG. 8 is a perspective view showing the case (upper case) of the camera module. The case 34 has a holder portion 34a located on the subject side on the lower side, and the holder portion 34a is attached to the holder portion 34a. The optical lens 35 is arranged in the formed lens storage space as indicated by a solid line arrow. Bearing portions 34b and 34c into which the guide shaft 36 and the drive shaft 37 are inserted are formed on the upper surface of the holder portion 34a, and one ends of the guide shaft 36 and the drive shaft 37 are inserted into the bearing portions 34b and 34c, respectively. . The case 34 has an upstanding wall 34d formed integrally with the holder portion 34a, and a sensor tape 38 is affixed to the upstanding wall 34d.

  Referring to FIG. 9, four capacitors 39 are mounted on the side surface of the holder portion 34a as shown in the figure (two of the capacitors 39 are used for driving the piezo element 18 and the other two are piezo elements. A notch 34e is formed on one side of the standing wall 34d, and four inductors 40 are mounted on the standing wall 34d (two of the inductors 40 are used for driving the element 29). The position detection sensor 41 for the lens assembly 22 and the position detection sensor 42 for the lens assembly 25 are mounted. The other two are used for driving the piezo element 29). That is, the standing wall 34d is formed with a storage portion for storing the electric element.

  Referring to FIG. 10, subsequently, the lens assembly 22 is inserted into the drive shaft 37 so that the folded portion 20a faces the subject side (that is, the holder portion 34a side), and the bearing portion 15b is guided. 11 is a diagram showing a state in which the lens assembly 22 is inserted into the drive shaft 37 and the guide shaft 36, and the lens assembly 25 is mounted after the lens assembly 22 is mounted. Then, the wiring members 20 and 31 are positioned in the notch 34e (see also FIG. 15).

  Referring to FIGS. 12 and 13, FIG. 12 is a plan view after the lens assembly 22 is mounted, and FIG. 13 is a sectional view thereof. As shown in FIG. 12, in the bearing portion 15a, the opposing surface of the operating portion 18a of the piezo element 18 has a V-groove shape 15-1, and the drive shaft 37 is in contact with the V-groove 15-1. That is, the outer peripheral surface of the drive shaft 37 abuts against the operating portion 18a at the first location, and abuts against the V groove 15-1 at the second location, and the drive shaft 37 slides at the second location. At this time, the left and right side surfaces (upper and lower side surfaces in FIG. 11) of the piezo element 18 are guided by the pair of fixed walls 211 of the piezo storage portion 21d. And the surface processing is made different in the first and second places, for example, the surface of the second place is processed more smoothly than the surface of the first place (that is, the first place The surface is treated more smoothly and rougher than the surface of the second part). As a result, the friction coefficient at the second location is smaller than the friction coefficient at the first location. Furthermore, you may make it perform a lubrication process only to the surface of a 2nd location. Note that the above-described V groove 15-1 may be formed at two locations in the vertical direction, and the operating portion 18a may be brought into contact with the drive shaft 37 between the two V grooves. The guide shaft 36 may be subjected to the same surface treatment as the drive shaft 37.

  As described above, as a result of the rear end of the piezo element 18 being pressed by the second pressing portion 21d, the operating portion 18a abuts on the outer peripheral surface of the drive shaft 37, and the drive shaft 37 contacts the V groove 15-1. Touch. As shown in FIG. 13, a pair of protrusions 15-2 are formed at predetermined intervals on the fixed wall (upper surface and lower surface) of the piezo storage portion 15 c. The piezo element 18 is pressed downward in the figure by the pressing portion 21b and is sandwiched between the protruding portions 15-2. On the other hand, as described above, the rear end of the piezo element 18 is pressed toward the drive shaft 37 by the second pressing portion 21 d, and the operating portion 18 d comes into contact with the outer peripheral surface of the drive shaft 37. That is, as shown in FIG. 13, the upper and lower side surfaces of the piezo element 18 in the drawing are pressed and held deformably by the protrusions 15-2 formed at two locations, respectively, and are opposite to the operating portion 18 d of the piezo element 18. These ends are pressed against the drive shaft 37 by the biasing means. The protruding portion 15-2 is formed at a position where the vibration node portion of the piezo element 18 is pressed. The drive shaft 37 abuts on an abutment body 43 having a first abutment portion 15-3 and a second abutment portion 15-4, and the abutment body 43 abuts on the abutment portion 15-5. It is held in contact with the body 44.

  As described above, when the lens assembly 22 is mounted on the drive shaft 37 and the guide shaft 36 as described above, the operating portion 18 d of the piezo element 18 comes into contact with the drive shaft 37. Then, as shown in FIG. 11, the lens assembly 25 is inserted into the drive shaft 37 so that the folded portion 31a faces the image forming side (that is, the side opposite to the holder portion 34a). The part 26 b is inserted into the guide shaft 36. The bearing portion 26a is configured in the same manner as the bearing portion 15a described above. When the lens assembly 25 is mounted on the drive shaft 37 and the guide shaft 36, the operating portion 29a of the piezo element 19 abuts on the drive shaft 37. become.

  In the above example, the opposing surface (actuating portion contact surface) of the bearing portion 15a is formed in a V shape, and the bearing 15b has a shape corresponding to the outer shape of the guide shaft 36. The operating portion contact surface and the bearing 15b may be configured by using a V-shaped roller. As shown in FIGS. 14A to 14C, cylindrical flat rollers 401 and 411 are used. May be configured to be accommodated in the bearing portion so as to be V-shaped with respect to the guide shaft 36 (in FIGS. 14A to 14C, the bearing portion 15b is represented by the bearing portion 421). The guide shaft 36 is represented by a shaft member 291).

  14A is a plan view of the bearing portion 421, FIGS. 14B and 14C are a side view and a perspective view of the bearing portion 421, and the flat rollers 401 and 411 are the bearings. A V-shaped notch 431 provided in the portion 421 is held in a U-shaped bearing 441 so as to be V-shaped with respect to the shaft member 291. By configuring the bearing portion 421 in this manner, manufacturing errors occur in the first and second lens holders, and the position of the bearing portion is a normal position due to the thrust backlash in each of the orthogonal flat rollers 401 and 411. Even if they are displaced from each other, the shaft member 291 is brought into contact with the V-shaped valley formed when the flat rollers 401 and 411 are orthogonal to each other. The optical axis of the second lens holder is not affected.

  After the lens assembly 25 is mounted as described above, the bottom cover (lower cover) 45 is mounted on the case 34 from the imaging side, as shown in FIG. The bottom cover 45 is formed with a bearing portion (not shown) into which the guide shaft 36 and the drive shaft 37 are inserted. Further, as shown in FIG. 16, side covers (light shielding covers) 46 and 47 are attached to the case 34 to constitute a camera module housing 48. As a result, the piezo elements 18 and 19 are positioned on the one surface 46 a (hereinafter referred to as the first side surface) side of the side cover 46 constituting the camera module housing 48. When the side surface 46b adjacent to the first side surface 46a is referred to as the second side surface 46b, the sensor tape and the position detection sensors 41 and 42 are disposed on the second side surface side. Further, the first and second wiring members 20 and 31 are arranged on the second side face 46b side, respectively.

  As shown in FIG. 17, the CCD assembly 14 is mounted on the camera module housing 48 to obtain a camera module 49 shown in FIG. In FIG. 18, the imaging side is the upper side, and an ASIC (third wiring material) 49 a that connects the wiring material 20 and the wiring material 31 to the CCD assembly 14 is disposed on the side surface of the camera module housing 48 ( The ASIC 49a is also connected to position detection sensors 41 and 42). At this time, the wiring space of the wiring materials 20 and 31 is positioned in the vicinity of the first side surface 46a of the second side surface 46b, and the connection portion that connects the wiring materials 20 and 31 and the third wiring material is the second side. Positioned on the side surface 46b. Then, as shown in FIG. 19, the camera module 49 is completed with the subject side as the upper side.

  Although the inductor 40 is positioned on the second side surface 46b side, the inductor 40 may be positioned on the first side surface 46a side. Similarly, the capacitor 39 is positioned on the first side surface 46a side, but the capacitor 39 may be positioned on the second side surface 46b side. Further, the upright wall in which the electric element is stored need not be provided in the upper cover, and the upright wall may be provided in the lower cover. Further, the upper cover and the lower cover may be joined by, for example, an engaging member and an engaged member, and further, the upper cover and the lower cover may be joined using an adhesive. It may be.

  As described above, the camera module 49 has a substantially cubic case body having four side surfaces parallel to the optical axis, and the piezo elements 18 and 29 are positioned on one side surface side of the case body. The drive shaft 37 is disposed in the vicinity of a corner defined by the one side surface and the side surface adjacent to the one side surface, and the guide shaft 36 is disposed at a corner portion facing the corner portion.

  In the camera module 49 shown in the first embodiment, the optical lens 35 is fixedly disposed, and the lens assemblies 22 and 25 are movably supported by the guide shaft 36 and the drive shaft 37. When the lens assembly 25 moves to the optical lens 35 side, a telephoto state is established. Following the movement of the lens assembly 25, the lens assembly 22 also moves to the optical lens 35 side. On the other hand, when the lens assembly 25 is returned to the lens assembly 22 side, a wide angle state is obtained, and the lens assembly 22 also moves following the movement of the lens assembly 25.

  The position detection sensors 41 and 42 detect the sensor tape, and the position detection sensors 41 and 42 detect the reference positions of the lens assemblies 25 and 22 and the amount of movement from the reference position.

  By the way, when the piezo element 18 is excited, a higher-order bending vibration is generated in the operating portion 18d, and a traveling wave is generated. A frictional force is generated between the outer peripheral surface of the drive shaft 37 to which the operating portion 18 d is pressed and the operating portion 18 d, and the lens assembly 22 on which the piezo element 18 is mounted is driven along the driving shaft 37 by this frictional force. Move (see, for example, Japanese Patent No. 2980541 or Special Table 2002-529037). That is, when the piezo element 18 is excited, the piezo element 18 performs a bending motion, and the lens assembly 22 moves along the driving shaft 37 by a frictional force generated between the driving shaft 37 and the operating portion 18d by the bending motion. Will do. The lens assembly 25 moves in the same manner.

  As is clear from the above description, in the first embodiment, when the drive shaft 37 is inserted into the bearing portion, the lens holder is guided along the guide shaft 36 in the optical axis direction, and the drive shaft 37 is driven by the piezo element. Receive. Since the piezo element is pressed and fixed to the piezo holding portion by the fixing member, that is, the two bearing portions, the piezo holding portion, and the fixing member are attached to the lens holder, the camera module can be reduced in size. .

  Furthermore, the piezo holding part is in contact with two opposite side surfaces of the piezo element so as to hold the piezo element, and is formed as a lightening part on the side surface other than the two abutting parts, so that the lens holder and thus the camera module It can be lighter.

  In the first embodiment, since the piezo element is inserted into the piezo holder from the direction orthogonal to the optical axis and the rear end of the piezo element is pressed by the fixing member, the piezo element fixing structure can be reduced in size and assembled. The process can be simplified.

  In Example 1, since the fixing member is conductive and the position facing the side surface of the piezo element is insulative, it is possible to prevent short-circuiting of the electrodes disposed on the side surface of the piezo element, and the fixing member is connected to the lens holder. Since it has the latching piece part to latch, size reduction and weight reduction can be achieved.

 In the first embodiment, since the groove for positioning the wiring material is provided in the lens holder, the positioning and fixing of the wiring material such as the flexible wiring can be shared by the lens holder. As a result, the size and weight can be reduced.

  In the first embodiment, in the camera module having the zoom and focus two-group lenses, the components provided in each lens holder are arranged substantially symmetrically, so that the camera module itself can be reduced in size and weight. Can be planned. In addition, since the wiring material is flexible wiring, the subject side wiring material is provided with a folded portion on the subject side, and the imaging side wiring material is provided with a folded portion on the imaging side. You can avoid it.

  In addition, according to the first embodiment, the drive shaft 37 and the guide shaft 36 are positioned at the corners of the lens holder, and the piezo elements are concentrated on a predetermined surface side of the lens holder. Therefore, the camera module can be reduced in size. be able to. Furthermore, since the longitudinal direction of the rectangular piezo elements is arranged in a direction perpendicular to the optical axis, the movement space of the piezo elements accompanying the movement of the lens holder can be minimized, and as a result, the camera module is miniaturized. It will be possible.

  The above-described camera module is incorporated into a mobile terminal, for example. FIG. 20 is a plan view showing a mobile phone 50 as an example of a mobile terminal in a state (open state) in which an operation unit (operation member) 51 and a display (display member) 52 can be seen. The mobile phone 50 shown in FIG. The first case portion 53 on which 51 is mounted and the second case portion 54 on which the display 52 is mounted are connected by a hinge mechanism 55, and the first and second case portions 53 and 54 are arranged around the hinge mechanism 55. Can be rotated. In addition, the 1st and 2nd case parts 53 and 54 comprise a case body.

  The second case 54 incorporates the above-described camera module 56 as indicated by a broken double circle in the figure. When a predetermined button of the operation unit 51 is operated, the camera module 56 takes an image, An image captured by the camera module 56 is displayed on the display 52, for example. Note that the camera module 56 has the upper side (optical lens 35 side) shown in FIG. 19 facing the outside of the second case portion 54. That is, an opening for exposing the optical lens 35 of the camera module 56 is formed in the second case portion 54. Although not shown, the first case portion 53 houses a battery, a communication portion, and the like, and the thickness dimension of the second case portion 54 is limited to the height of the camera module 56. Yes.

  In this manner, the first and second lens holders 15 and 16 are driven in the optical axis direction using the first and second piezoelectric elements, respectively. 16, that is, the structure of the lens moving mechanism when driving the optical lens system becomes extremely simple, and even if an autofocus (AF) function and a zoom function are incorporated, the camera module can be reduced in size and weight.

  The first guide bearing portion is arranged in the first lens holding portion, the first bearing portion is arranged in the first lens holding portion, and the first lens holding portion has a first piezoelectric holding portion. When the shaft member is inserted into the first bearing portion, the shaft member guides the first lens holding portion movably in the optical axis direction along the guide shaft member, and the first The driving force is received by the first piezo element disposed in the piezo holding part of the lens holding part, and at this time, the first piezo element is pressed and fixed to the piezo holding part by the first fixing member having elastic force. Since the first lens holding portion moves along the shaft member and the guide shaft member, the camera module can be reduced in size and weight when the autofocus (AF) function and the zoom function are incorporated. Turtle mounted on etc. It can be applied to the module.

It is a perspective view which decomposes | disassembles and shows an example of the CCD assembly used with the camera module by Example 1 of this invention. It is a perspective view which shows the state which mounts an optical lens to the lens holder (2nd lens holder) used in Example 1 of this invention. It is a perspective view which decomposes | disassembles and shows the lens assembly (2nd lens assembly) used in Example 1 of this invention. It is a figure for demonstrating the piezo element used in Example 1 of this invention, (a) is a perspective view which shows a piezo element, (b) And (c) is a figure for demonstrating an operation principle. FIG. 4 is a perspective view showing a state where an RF plate is attached to the lens assembly shown in FIG. 3. It is a perspective view which shows the lens assembly (2nd lens assembly) used in Example 1 of this invention, (a) And (b) is the perspective view seen from another angle, respectively. It is a perspective view which decomposes | disassembles and shows the lens assembly body (1st lens assembly body) used in Example 1 of this invention. It is a perspective view which shows the state which mounts an optical lens, a guide shaft, and a drive shaft in a case. It is a perspective view which shows the state which mounts | wears with an electrical component in a case. It is a perspective view which shows the state which mounts the 2nd lens assembly body to a guide shaft and a drive shaft. It is a perspective view which shows the state which mounts the 1st lens assembly body to a guide shaft and a drive shaft. It is a top view which shows the state which mounted | wore the 2nd lens assembly with the guide shaft and the drive shaft. It is sectional drawing of FIG. 2A and 2B are diagrams in which two rollers having a flat surface with respect to a guide shaft in a guide contact portion of a lens holder are arranged in a V shape, where FIG. 3A is a cross-sectional view, and FIG. (C) is a perspective view. It is a perspective view which shows the state which mounts | wears with a bottom cover. It is a perspective view which shows the state which mounts | wears a side cover. It is a perspective view which shows the state which mounts a CCD assembly. It is a perspective view which shows the external appearance of the camera module by Example 1 of this invention in the upside down state. It is a perspective view which shows the external appearance of the camera module by Example 1 of this invention. It is a figure which shows roughly an example of the mobile telephone incorporating the camera module by this invention. It is a figure which shows an example of the conventional camera module. It is a figure which shows the other example of the conventional camera module.

Explanation of symbols

14: CCD assembly 15, 26: Lens holder 15a, 15b, 26a, 26b: Bearing portion 15c, 26c: Piezo holding portion 18, 29: Piezo element 20, 31: Wiring material 21, 32: Fixing member 22, 25: Lens assembly 36: Guide shaft 37: Drive shaft 39: Capacitor 40: Inductor 41, 42: Position detection sensor

Claims (13)

A first lens holding unit that holds at least one optical lens and is movable in the optical axis direction;
A first guide bearing portion disposed in the first lens holding portion;
A first bearing portion disposed on the first lens holding portion;
A guide shaft member disposed in parallel with the optical axis, and movably guides the first lens holding portion by contacting the first guide bearing portion;
The first lens holding part is movably guided along the guide shaft member by being inserted into the first bearing part, and is arranged in the piezo holding part of the first lens holding part. A shaft member that receives a driving force by the first piezoelectric element,
A first fixing member having an elastic force and pressing and fixing the first piezoelectric element to the piezoelectric holding part,
A pressing portion that presses the first piezoelectric element extending in a direction substantially orthogonal to the optical axis to the first fixing member in a predetermined direction;
A first position detecting member disposed on the first lens holding portion;
A locking portion that locks with the first lens holding portion disposed at a position substantially opposite to the pressing portion ;
The first lens holding portion is disposed at a position where the first guide bearing portion and the first bearing portion are substantially opposed to each other, and the pressing portion and the first position of the first fixing member. The camera module which has arrange | positioned the member for a detection in the substantially opposing position.   2. The camera module according to claim 1, wherein the piezo holding unit holds the first piezo element by contacting two opposing side surfaces of the first piezo element. 3.   The camera module according to claim 2, wherein the piezo holding portion has a lightening portion disposed on a side surface other than the two abutting portions. The piezo holding unit includes an insertion part through which the first piezo element can be inserted from a direction substantially orthogonal to the optical axis,
The camera module according to claim 1, wherein the first fixing member presses an end portion of the first piezo element inserted through the insertion portion.   5. The camera module according to claim 1, wherein the first fixing member includes a conductive member and an insulating member disposed at a position substantially opposite to a side surface of the first piezo element. .   The camera module according to claim 1, wherein the first fixing member includes a retaining member for the optical lens of the first lens holding portion. Including a first wiring member for energizing the first piezoelectric element;
The camera module according to claim 1, wherein a groove portion for mounting and positioning the first wiring member is provided in the first lens holding portion.   2. The camera module according to claim 1, wherein the insertion portion, the first guide bearing portion, the pressing portion, and the first position detection member are respectively arranged at positions corresponding to four corners of the first lens holding portion. . A second lens holding unit that holds at least one optical lens and is movable in the optical axis direction;
A second guide bearing portion disposed coaxially with the first guide bearing portion of the first lens holding portion;
A second bearing portion disposed coaxially with the first bearing portion of the first lens holding portion;
A second fixing member having an elastic force and pressing and fixing the second piezoelectric element to the piezoelectric holding portion;
The shaft member is inserted into the second bearing portion to guide the second lens holding portion in the optical axis direction along the guide shaft member, and the piezo holding portion of the second lens holding portion. The camera module according to claim 1, wherein the camera module receives a driving force by a second piezo element arranged on the surface. A first wiring member for energizing the first piezoelectric element;
A second wiring material for energizing the second piezo element;
The first lens holding unit is disposed on the subject side, and the second lens holding unit is disposed on the imaging side.
The first wiring member is formed of a flexible member, and the folded portion of the first wiring member is disposed on the subject side of the first lens holding unit,
The camera module according to claim 9, wherein the second wiring member is formed of a flexible member, and a folded portion of the second wiring member is disposed on the image forming side of the second lens holding portion. Having a substantially cubic shape having at least four side surfaces substantially parallel to the optical axis;
A shaft member that movably guides the first lens holding portion and the second lens holding portion and is arranged in parallel with the optical axis;
A first actuating portion that contacts a side surface of the shaft member disposed at an end of the first piezoelectric element;
A second actuating portion that abuts against a side surface of the shaft member disposed at an end of the second piezo element,
Disposing the first piezo element and the second piezo element on a first side corresponding to a predetermined surface;
The shaft member is disposed in the vicinity of the first corner of the cube on the first side surface side,
11. The camera module according to claim 9, wherein the guide shaft member is disposed at another corner portion facing the first corner portion. The first piezo element and the second piezo element have a substantially rectangular plate-shaped outer shape,
The first piezo element is held by the first lens holding portion in a state in which the longitudinal direction is parallel to a direction substantially orthogonal to the optical axis,
The camera module according to claim 9, wherein the second piezo element is held by the second lens holding unit in a state in which a longitudinal direction is parallel to a direction substantially orthogonal to the optical axis. A first lens holding portion that holds at least one optical lens and is movable in the optical axis direction, a first guide bearing portion disposed in the first lens holding portion, and the first lens holding A first bearing portion disposed in the portion, and a guide shaft member disposed in parallel with the optical axis, while movably guiding the first lens holding portion by contacting the first guide bearing portion, The first lens holding part is movably guided in the optical axis direction along the guide shaft member by being inserted into the first bearing part, and is arranged in the piezo holding part of the first lens holding part. A shaft member that receives a driving force from the first piezoelectric element, a first fixing member that has elasticity and presses and fixes the first piezoelectric element to the piezoelectric holding portion, and light is applied to the first fixing member. Extended in a direction substantially perpendicular to the axis A pressing portion for pressing the serial first piezoelectric element in a predetermined direction, a first position detecting member disposed in the first lens holding portion, the first placed at a position substantially opposite to the pressing portion An engaging portion that engages with the lens holding portion , wherein the first lens holding portion is disposed at a position that substantially opposes the first guide bearing portion and the first bearing portion; A camera module in which the pressing portion of the first fixing member and the first position detection member are disposed substantially opposite to each other;
An operation member, a display member, a battery, a communication unit,
A portable terminal comprising: a housing that houses the camera module, the display member, the battery, and the communication unit, and that has a thickness dimension substantially limited to a height of the camera module.

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