JP2010266637A - Drive device, lens component, and camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently convert vibration generated by expansion and contraction of a piezoelectric element into displacement of an object to be moved. <P>SOLUTION: The drive device includes a coupling body which is obtained by coupling a piezoelectric element 42 and a transmission shaft 44, a fixed-side member with which the transmission shaft 44 is engaged in a slidable state in a longitudinal direction of the transmission shaft 44, and a lens holder 31 to which the transmission shaft 44 is fixed through an adhesive 43 at least having hardness equal to or more than Shore D60. The lens holder 31 holds lenses L1 and L2. The vibration generated by the expansion and contraction of the piezoelectric element 42 can be more efficiently converted into the displacement of the lens holder 31 than before. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a driving device, a lens component, and a camera module.

  In recent years, imaging devices such as cameras have been incorporated into a wide variety of products. When a camera is mounted on a small electronic device such as a mobile phone or a notebook computer, it is strongly required to reduce the size of the camera itself.

  An autofocus lens may be incorporated in the camera. In this case, downsizing of the actuator that displaces the lens is strongly desired. As a small actuator, one that moves a moving object by driving a piezoelectric element is known (see Patent Document 1). Patent Document 1 discloses a system in which a piezo element is urged by a leaf spring and the piezo element and a shaft member are engaged with each other (see FIG. 10 of Patent Document 1).

JP 2006-178490 A

  An actuator using a piezoelectric element is required to displace a moving object to a desired position in a short time. In order to realize this requirement, it is important to efficiently convert the vibration generated by the expansion and contraction of the piezoelectric element into the displacement of the moving object. However, it is difficult to predict the cause of vibration attenuation and the cause of resonance, and it has not yet been possible to efficiently convert vibration caused by expansion and contraction of the piezoelectric element into displacement of the moving object.

  As is clear from the above description, it is strongly desired to efficiently convert the vibration generated by the expansion and contraction of the piezoelectric element into the displacement of the moving object.

  The drive device according to the present invention includes a connecting body in which a piezoelectric element and a drive shaft are connected, a fixed-side member engaged with the drive shaft in a slidable state in the longitudinal direction of the drive shaft, and at least Shore D60 or more. And a moving object to which the drive shaft is fixed through an adhesive having a hardness of.

  The moving object may include a support portion that supports the drive shaft, and the support portion may be fixed to the drive shaft via the adhesive.

  The moving object may include a plurality of support portions that support the drive shaft.

  The support portion that is relatively far from the piezoelectric element is preferably fixed to the drive shaft via the adhesive.

  The support portion that is relatively close to the piezoelectric element is preferably fixed to the drive shaft via the adhesive.

  The piezoelectric element and the drive shaft are preferably fixed by the adhesive that fixes the support portion and the drive shaft that are relatively close to the piezoelectric element.

  The adhesive is preferably an epoxy resin. The moving object may be a lens holder that holds a lens.

  A camera module according to the present invention includes the above-described driving device and an imaging unit that captures an image input via the lens.

  The lens component according to the present invention holds the connecting body in which the piezoelectric element and the driving shaft are connected, and at least one lens, and the driving shaft is fixed through an adhesive having a hardness of at least Shore D60 or more. A lens holder.

  In the camera module according to the present invention, the drive shaft is fixed to the connecting body in which the piezoelectric element and the drive shaft are connected, and at least one lens, and the adhesive is at least harder than Shore D60. A lens holder; and imaging means for capturing an image input via the lens.

  According to the present invention, vibration generated by expansion and contraction of a piezoelectric element can be converted into displacement of a moving object more efficiently than in the past.

1 is a schematic end view of a camera module according to a first embodiment of the present invention. It is a schematic diagram which shows schematic structure of the axis | shaft holding | maintenance part concerning the 1st Embodiment of this invention. It is a block diagram which shows the schematic structure of the drive part concerning the 1st Embodiment of this invention. It is a wave form diagram which shows the waveform of the drive voltage input into the piezoelectric element concerning the 1st Embodiment of this invention. 1 is a schematic circuit diagram of a drive voltage generation circuit according to a first embodiment of the present invention. 6 is a table for explaining the operation of the drive voltage generation circuit according to the first embodiment of the present invention. It is explanatory drawing for demonstrating the duty ratio concerning the 1st Embodiment of this invention. It is a table | surface which shows the relationship between the hardness of the adhesive agent concerning 1st Embodiment of this invention, and a lens moving speed. It is a table | surface which shows the relationship between the application location of the adhesive agent concerning the 1st Embodiment of this invention, and a lens moving speed. It is a schematic diagram which shows the selectable range of the frequency and duty ratio concerning the 1st Embodiment of this invention. 1 is a schematic schematic diagram of a mobile phone according to a first embodiment of the present invention. 1 is a schematic schematic diagram of a mobile phone according to a first embodiment of the present invention. It is a schematic fragmentary figure of the camera module concerning the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each embodiment is simplified for convenience of explanation. Since the drawings are simple, the technical scope of the present invention should not be interpreted narrowly based on the drawings. The drawings are only for explaining the technical matters, and do not reflect the exact sizes or the like of the elements shown in the drawings. The same elements are denoted by the same reference numerals, and redundant description is omitted. Words indicating directions such as up, down, left, and right are used on the assumption that the drawing is viewed from the front.

[First Embodiment]
The first embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, the camera module (image acquisition device) 150 includes a wiring board 10, a housing (envelope) 50, an image sensor (imaging device, imaging means) 12, a lens holder (lens holder) 31, It has a piezo element (piezoelectric element (vibration source)) 42, a transmission shaft (drive shaft) 44, and a shaft holding portion 45. The lens holder 31 holds a plurality of lenses L1 and L2 (moving objects). The lenses L1 and L2 are disposed along the optical axis AX. Note that a connecting body is formed by connecting the transmission shaft 44 to the piezo element 42 via an adhesive. The connection method between the piezo element 42 and the transmission shaft 44 is arbitrary.

  The camera module 150 captures an image input from the outside via the lenses L <b> 1 and L <b> 2 held by the lens holder 31 with the image sensor 12. The lens holder 31 moves in the forward direction or the reverse direction along the optical axis AX in accordance with the driving of the piezo element 42. Thereby, the camera module 150 can be provided with an autofocus function or a zoom function.

  The housing 50 is a cylindrical body that houses the image sensor 12, the piezoelectric element 42, the transmission shaft 44, the shaft holding portion 45, and the lens holder 31. The casing 50 is manufactured by molding a black resin material with a mold or the like. The light shielding performance of the camera module 150 can be improved by manufacturing the cover by molding a black resin mold. More preferably, a resin having reflow heat resistance such as polyphenylene sulfide resin (PPS), liquid crystal polymer (LCP), and polyphthalamide resin (PPA) may be used. The housing 50 is a fixed-side member that is fixed in position as viewed from the lenses L1 and L2.

  The housing 50 includes a top plate portion 50a and a side wall portion 50b. Openings are formed in the top plate portion 50a at positions corresponding to the optical axes AX of the lenses L1 and L2. A shaft holding portion 45 is fixed to the inner wall of the side wall portion 50b. In addition, the shape of the housing | casing 50 is arbitrary and you may employ | adopt other various shapes.

  On the wiring board 10, the image sensor 12 and the lens holder 31 are arranged in this order along the optical axis AX.

  The image sensor 12 is a general solid-state image sensor such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor. The image sensor 12 has a plurality of pixels arranged in a matrix on the XZ plane in the pixel arrangement region 12a. Each pixel performs photoelectric conversion to convert the input image into image data and output it.

  The piezo element 42 is a general piezoelectric element in which ceramic layers (piezoelectric layers) are stacked along the y-axis. A pair of terminal electrodes is formed on the side surface of the piezo element 42. One terminal electrode of the piezo element 42 is connected to an electrode pad on the wiring board 10 via a lead wire. Similarly, the other terminal electrode of the piezo element 42 is connected to an electrode pad on the wiring board 10 via a lead wire. The piezoelectric element 42 expands and contracts in the y-axis direction (direction along the optical axis AX) by applying a voltage to the other terminal electrode while one terminal electrode is grounded.

  The transmission shaft 44 is fixed to the upper surface of the piezo element 42. Specifically, the transmission shaft 44 is fixed to the piezo element 42 via an adhesive (not shown) with the lower end surface of the transmission shaft 44 placed on the upper surface of the piezo element 42. It is preferable to use a thermosetting adhesive such as epoxy.

  The transmission shaft 44 is a rod-like body, and transmits vibration generated by the piezo element 42 to the lens holder 31. The transmission shaft 44 is desirably lightweight and highly rigid. Preferably, the transmission shaft 44 is made of a material having a specific gravity of 2.1 or less. More preferably, the transmission shaft 44 is made of a material having a specific gravity of 2.1 or less and an elastic modulus of 20 GPa or more. More preferably, the transmission shaft 44 is made of a material having a specific gravity of 2.1 or less and an elastic modulus of 30 GPa or more. By setting the material of the transmission shaft 44 as described above, the resonance frequency can be shifted to the high frequency side, and it has been confirmed that a continuous usable frequency band is obtained.

  The transmission shaft 44 is preferably molded from glassy carbon, fiber reinforced resin, or epoxy resin. Particularly preferred are glassy carbon composites containing graphite, fiber reinforced resins and glass containing carbon, and epoxy resin composites containing carbon.

  The lens holder 31 is a cylindrical body and holds the lenses L1 and L2. The lenses L1 and L2 are sequentially arranged along the optical axis AX. The lens holder 31 is manufactured by molding black resin with a mold or the like.

  The lenses L1 and L2 are incorporated in the lens holder 31 by press-fitting into the opening of the lens holder 31. Specifically, the opening diameter of the lens holder 31 is set to be approximately the same as the diameters of the lenses L1 and L2, and the lenses L1 and L2 are inserted into the opening of the lens holder 31 with pressure. In this way, the lenses L1 and L2 are incorporated into the lens holder 31. In FIG. 1, the holding mode of the lenses L1 and L2 by the lens holder 31 is shown in a simplified manner.

  The lens holder 31 includes a flat plate portion (support portion) 32 that exists in a direction away from the lenses L1 and L2. The flat plate portion 32 has an opening having a diameter slightly larger than the diameter of the transmission shaft 44. The transmission shaft 44 is inserted into the opening of the flat plate portion 32, and both are fixed by the adhesive 43 in this state. In this way, the transmission shaft 44 is attached to the lens holder 31.

  The transmission shaft 44 is held immovably by the flat plate portion 32a at the upper end portion and immovably held by the flat plate portion 32b at the lower end portion. The flat plate portion 32 and the transmission shaft 44 are fixed by an adhesive 43.

  In the present embodiment, the adhesive 43 is made of a black adhesive having a hardness of Shore D60 or higher. As a result, the transmission shaft 44 and the flat plate portion 32 are firmly fixed, and the vibration generated according to the expansion and contraction of the piezo element 42 can be efficiently converted into the displacement of the lens holder 31. The hardness is measured based on the standards of JIS-K-7215 and ISO-868 “Plastic Durometer Hardness Test Method”.

  Further, the adhesive 43 according to the present embodiment is thermosetting. In the case of an ultraviolet curable adhesive, an unirradiated part of ultraviolet rays may be generated. On the other hand, in the case of a thermosetting adhesive, since the adhesive is uniformly cured by the overall overheating, the possibility that an uncured portion remains is low. By firmly fixing the transmission shaft 44 and the flat plate portion 32 via a thermosetting adhesive, the vibration generated according to the expansion and contraction of the piezo element 42 is efficiently converted into the displacement of the lens holder 31 as described above. It becomes possible to do. The adhesive 43 is, for example, an epoxy resin or a solder alloy.

  Furthermore, in this embodiment, the adhesive 43 is applied to each of the pair of flat plate portions 32a and 32b, and the flat plate portion 32 and the transmission shaft 44 are fixed to each other at both locations. As a result, it is possible to suppress the vibration of the transmission shaft 44 in the x-axis direction (see FIG. 1) and efficiently convert the vibration generated according to the expansion and contraction of the piezo element 42 into the displacement of the lens holder 31. .

  When the lens holder 31 loosely supports the transmission shaft 44, the vibration generated according to the expansion and contraction of the piezo element 42 may be converted into roll (vibration in the x-axis direction (see FIG. 1)). In this case, there is a possibility that it is difficult to efficiently convert the vibration generated in the piezo element 42 into the displacement of the lens holder 31 in the y-axis direction.

  In the present embodiment, an adhesive having a hardness of Shore D60 or higher is applied to the flat plate portions 32a and 32b, and the flat plate portion 32 and the transmission shaft 44 are fixed to each other at both locations. By firmly fixing the transmission shaft 44 and the flat plate portion 32 at a plurality of locations separated along the optical axis AX, the occurrence of the above-mentioned rolling is suppressed, and vibration generated according to the expansion and contraction of the piezoelectric element 42 is efficiently performed. It is possible to convert the displacement into the displacement of the lens holder 31.

  The shaft holding part 45 is fixed to the side wall part 50 b of the housing 50. The shaft holding part 45 holds the transmission shaft 44 in a slidable state. In other words, the shaft holding portion 45 frictionally engages the transmission shaft 44 with the housing 50. In addition, friction engagement is equal to the state engaged in a slidable state. The shaft holding portion 45 is a fixed side member that is fixed in position as viewed from the lenses L1 and L2.

  FIG. 2 shows the configuration of the shaft holding portion 45. The shaft holding portion 45 has a bearing portion that receives the transmission shaft 44. The transmission shaft 44 received by the bearing portion is urged by an urging mechanism described later. In this way, the shaft holding portion 45 holds the transmission shaft 44.

  As shown in FIG. 2A, the shaft holding portion 45 includes a flat plate portion 48, a pressing plate (pressing member) 46, and a spring (biasing member, elastic member) 47. The holding plate 46 and the spring 47 are arranged in an opening formed in the flat plate portion 48.

  As shown in FIG. 2B, the presser plate 46a is a member having a dogleg shape in a top view. The presser plate 46 a comes into contact with the transmission shaft 44 at two points. The pressing plate 46a is made of metal, for example. The holding plate 46b has the same configuration as the holding plate 46a. A space OP6 is formed between the presser plate 46a and the transmission shaft 44. A space OP <b> 5 is formed between the presser plate 46 b and the transmission shaft 44.

  The spring 47 urges the presser plate 46b from the outside to the inside. The holding plate 46b biased by the spring 47 presses the transmission shaft 44 and the holding plate 46a inward. In this way, the transmission shaft 44 is urged against the flat plate portion 48, and both are frictionally engaged. Then, the lens holder 31 and the transmission shaft 44 are in frictional engagement with the housing 50 via the shaft holding portion 45.

  Note that the wiring board 10 shown in FIG. 1 is a flexible sheet-like wiring board. The wiring board 10 functions as a transmission path for control signals input to the image sensor 12 and video signals output from the image sensor 12. Further, the wiring board 10 functions as a transmission path for driving voltage input to the piezo element 42. Here, the black wiring board 10 is used to prevent stray light from entering the camera module 150.

  Next, a mechanism for displacing the lens will be described with reference to FIG. As shown in FIG. 3, the output of the controller 80 is connected to a drive voltage generation circuit 81. The output of the drive voltage generation circuit 81 is connected to the vibration source 82. A circuit example of the drive voltage generation circuit 81 will be described later.

  The controller 80 is a CPU incorporated in the mobile phone 90 (see FIG. 11), and generates various commands by executing a program. The controller 80 activates the function of the camera module in response to the operation of the mobile phone 90 by the operator. The drive voltage generation circuit 81 generates a drive voltage applied to the vibration source 82 in accordance with a control signal from the controller 80. At this time, the autofocus function of the camera module is in the on state, and the image sensor is also in the image capture mode. The vibration source 82 corresponds to the piezo element 42 described above.

  Based on the above premise, the operation of displacing the lens holder 31 will be described with reference to FIG. Here, a drive voltage having a sawtooth waveform is applied to the piezo element 42. The waveform of the drive voltage is arbitrary.

  First, the case where the drive voltage shown in FIG. 4A is applied to the piezo element 42 will be described. In the case shown in FIG. 4A, the drive voltage is shorter in the rising period TR1 than in the falling period TR2.

  During the drive voltage rising period TR1, the lens holder 31 is displaced in the forward direction. On the other hand, the lens holder 31 is not displaced during the fall period TR2 of the drive voltage. The lens holder 31 can be displaced in the forward direction (object side) by applying to the piezo element 42 a drive voltage in which the rising period TR1 is shorter than the falling period TR2.

  Next, the case where the drive voltage shown in FIG. 4B is applied to the piezo element 42 will be described. In the case shown in FIG. 4B, the drive voltage is longer in the rising period TR3 than in the falling period TR4.

  The lens holder 31 is not displaced during the drive voltage rising period TR3. On the other hand, the lens holder 31 is displaced in the reverse direction during the fall period TR4 of the drive voltage. The lens holder 31 can be displaced in the reverse direction (image sensor side) by applying to the piezo element 42 a drive voltage in which the rising period TR3 is longer than the falling period TR4.

  With reference to FIGS. 5 and 6, the circuit of the drive voltage generation circuit 81 and its operation will be further described.

  As shown in FIG. 5, the drive voltage generation circuit 81 includes a switching signal generation circuit (pulse signal generation circuit) 85, switches SW1 to SW4, current sources CS1 and CS2, and a power source PS. Note that the output of the controller 80 is connected to the switching signal generation circuit 85.

  A switch SW3, a current source CS1, and a switch SW4 are connected in series between the power supply PS and the ground potential GND. A switch SW1, a current source CS2, and a switch SW2 are connected in series between the power supply PS and the ground potential GND. A node between the current source CS1 and the switch SW4 is connected to a node between the switch SW1 and the current source CS2. The node between the current source CS1 and the switch SW4 and the node between the switch SW1 and the current source CS2 are connected to one end of the piezo element PZ. The other end of the piezo element PZ is connected to the switch SW2, the switch SW4, and the ground potential GND. The switches SW1 to SW4 are switching elements such as MOS (Metal Oxide Semiconductor) transistors.

  The operation states of the switches SW1 to SW4 are controlled by a switching signal generation circuit 85 as shown in FIG. The switching signal generation circuit 85 has terminals T1 to T4. The operating states of the switches SW1 to SW4 are determined by the switching signals VS1 to VS4 output from the terminals T1 to T4. For example, when the switching signal is at a high level, the switches SW1 to SW4 are turned on. When the switching signal is at a low level, the switches SW1 to SW4 are turned off.

  In the first state shown in FIG. 6, the piezo element PZ is charged by the current source CS1. In the second state, the piezo element PZ is discharged. In the third state, the piezo element PZ is charged by the current source CS1. In the fourth state, the piezo element PZ is discharged. By repeatedly switching between the first state and the second state, the lens holder 31 is displaced in the forward direction (object side). By repeatedly switching between the third state and the fourth state, the lens holder 31 is displaced in the reverse direction (image sensor side).

  As schematically illustrated in FIG. 7, the duty ratio D of the switching signal output from the switching signal generation circuit 85 is calculated by D = D2 / D1 × 100. However, D2 corresponds to the pulse width of the switching pulse SP. D1 corresponds to the period of the switching pulse SP.

  In the present embodiment, the lens holder 31, the piezo element 42, and the transmission shaft 44 are movable with respect to the housing 50. In other words, the lens holder 31, the piezo element 42, and the transmission shaft 44 are used as the movable unit MU. The influence of resonance of the housing 50 can be reduced.

  In the present embodiment, the adhesive 43 is made of an adhesive having a hardness of Shore D60 or higher. As a result, the transmission shaft 44 and the flat plate portion 32 are firmly fixed, and the vibration generated according to the expansion and contraction of the piezo element 42 can be efficiently converted into the displacement of the lens holder 31.

  The adhesive 43 according to this embodiment is thermosetting. In the case of an ultraviolet curable adhesive, an unirradiated part of ultraviolet rays may be generated. On the other hand, in the case of a thermosetting adhesive, the adhesive is uniformly cured by the overall overheating, and it is unlikely that an uncured portion is generated. By firmly fixing the transmission shaft 44 and the flat plate portion 32 via a thermosetting adhesive, the vibration generated according to the expansion and contraction of the piezo element 42 is efficiently converted into the displacement of the lens holder 31 as described above. It becomes possible to do.

  In the present embodiment, the transmission shaft 44 is fixed to each of the pair of flat plate portions 32a and 32b via the adhesive 43. As a result, it is possible to suppress the vibration of the transmission shaft 44 in the x-axis direction (see FIG. 1) and efficiently convert the vibration generated according to the expansion and contraction of the piezo element 42 into the displacement of the lens holder 31. .

  Referring to FIG. 8, the influence of the hardness of the adhesive on the lens moving speed is shown. As shown in FIG. 8, when an adhesive having a hardness of Shore D60 or higher was employed, a prototype with a high lens moving speed could be obtained. It can be seen that the lens moving speed decreases when a soft adhesive such as a silicone adhesive is used, and the lens moving speed can be increased when a hard adhesive such as an epoxy adhesive is used.

  With reference to FIG. 9, the influence which the application | coating location of an adhesive agent has on a lens moving speed is shown. Here, an adhesive having a hardness of Shore D60 or higher is used.

  As shown in FIG. 9, by applying an adhesive to both the flat plate portion 32a and the flat plate portion 32b and fixing between the flat plate portion 32 and the transmission shaft 44 at both locations, the prototype has a high lens moving speed. Could get. Rather than applying an adhesive only to the flat plate portion 32b and fixing between the flat plate portion 32b and the transmission shaft 44, it is better to apply an adhesive only to the flat plate portion 32a and fix the flat plate portion 32a and the transmission shaft 44. We were able to obtain a prototype with a fast lens movement speed.

  Referring to FIG. 10, the influence of the location where the adhesive is applied on the frequency and duty ratio of the selectable switching signal is shown. Here, an adhesive having a hardness of Shore D80 or higher is used.

  In the case shown in FIG. 10A, the adhesive 43 is applied to both the flat plate portions 32a and 32b, and the flat plate portion 32 and the transmission shaft 44 are fixed to each other at both locations. In the case shown in FIG. 10B, the adhesive 43 is applied only to the flat plate portion 32a, and the flat plate portion 32 and the transmission shaft 44 are fixed to each other at one location. In the case shown in FIG. 10C, the adhesive 43 is applied only to the flat plate portion 32b, and the flat plate portion 32 and the transmission shaft 44 are fixed to each other at one location. FIG. 10B also corresponds to the case where the silicone adhesive is applied to both the flat plate portions 32a and 32b and the flat plate portion 32 and the transmission shaft 44 are fixed at both locations.

  As apparent from FIGS. 10A to 10C, the adhesive can be selected by applying the adhesive to the flat plate portions 32a and 32b and firmly fixing the flat plate portion 32 and the transmission shaft 44 at both locations. It can be seen that the frequency and duty ratio of the switching signal increases.

  As shown in FIG. 10, in this embodiment, a continuous usable frequency band can be obtained, and the degree of freedom in selecting the frequency of the switching signal can be increased. The lens can be displaced at high speed by shifting the frequency of the switching signal to the high frequency side.

  When the selectable frequency band is narrow, it may be difficult to displace the lens holder 31 due to an unexpected cause such as a failure. On the other hand, in this embodiment, the selectable frequency band itself is expanded. Therefore, it is possible to effectively suppress the frequency selected for some unexpected cause from being included in the resonance frequency band.

  In the present embodiment, the opening diameter of the flat plate portion 32 is slightly larger than the diameter of the transmission shaft 44, but should not be limited to this. The opening diameter of the flat plate portion 32 may be slightly smaller than the diameter of the transmission shaft 44 and the transmission shaft 44 may be fitted into the opening of the flat plate portion 32 by applying pressure. In the same manner as described above, the flat plate portion 32 and the transmission shaft 44 may be firmly fixed with an adhesive having a hardness of Shore D60 or higher. Further, the opening diameter of the flat plate portion 32 may be substantially the same as the diameter of the transmission shaft 44. In the same manner as described above, the flat plate portion 32 and the transmission shaft 44 may be firmly fixed with an adhesive having a hardness of Shore D60 or higher.

  Finally, a mobile phone 90 in which the camera module 150 according to this embodiment is incorporated will be described with reference to FIGS.

  The camera module 150 is incorporated in the mobile phone (electronic device) 90 shown in FIG.

  As shown in FIG. 11, the mobile phone 90 includes an upper body (first member) 91, a lower body (second member) 92, and a hinge 93. The upper main body 91 and the lower main body 92 are both plastic plate members and are connected via a hinge 93. The upper main body 91 and the lower main body 92 are configured to be freely opened and closed by a hinge 93. When the upper body 91 and the lower body 92 are closed, the mobile phone 90 is a flat plate member in which the upper body 91 and the lower body 92 are overlapped.

  The upper main body 91 has a display unit 94 on the inner surface thereof. The display unit 94 displays information (name, telephone number) for identifying the called party, an address book stored in the storage unit of the mobile phone 90, and the like. A liquid crystal display device is incorporated under the display unit 94.

  The lower main body 92 has a plurality of buttons 95 on its inner surface. The operator of the cellular phone 90 operates the button 95 to open the address book, make a call, set the manner mode, and operate the cellular phone 90 as intended. The operator of the mobile phone 90 activates the camera module 150 in the mobile phone 90 based on operating this button 95.

  FIG. 12 shows the configuration of the front surface (upper surface) of the mobile phone 90. As shown in FIG. 12, a display area 96 is formed on the front surface of the upper main body 91. The LED arranged in the display area 96 emits light, so that the incoming state can be notified to the operator. The above-described camera module 150 is incorporated in the area 97 on the front surface of the upper body 91.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, unlike the first embodiment, the piezo element 42 and the transmission shaft 44 are also fixed using an adhesive 43 that fixes the flat plate portion 32 b to the transmission shaft 44. As a result, the flat plate portion 32b and the transmission shaft 44 can be fixed together and the piezo element 42 and the transmission shaft 44 can be fixed together by a single bonding operation, and the assembly work can be made efficient. Further, the piezo element 42, the transmission shaft 44, and the flat plate portion 32b can be firmly fixed via an adhesive having high hardness, and the transmission degree of vibration can be increased.

  In order to move the lens holder 31 along the optical axis AX within a sufficient range, it is important to reduce the thickness of the movable part MU along the optical axis AX. In the present embodiment, in view of this point, the distance between the flat plate portion 32 b and the piezoelectric element 42 is narrowed, and the adhesive 43 is injected between the flat plate portion 32 b and the piezoelectric element 42. According to the present embodiment, it is possible to improve the assembly work as described above while reducing the thickness of the movable part MU. In the case of this embodiment, the same effects as those described in the first embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. The use of the drive device is arbitrary. The connection mode between the drive shaft and the piezoelectric element is arbitrary, and both may be connected via another member. It is not always necessary to dispose a piezoelectric element on the end face of the drive shaft and connect the two.

150 Camera module

DESCRIPTION OF SYMBOLS 10 Wiring board 12 Image sensor 12a Pixel arrangement | positioning area | region 31 Lens holder 32 (32a, 32b) Flat plate part 42 Piezo element 43 Adhesive 44 Transmission shaft 45 Shaft holding part 46 (46a, 46b) Holding plate 47 Spring 48 Flat plate part 50 Case 50a Top plate part 50b Side wall part

80 Controller 81 Drive voltage generation circuit 82 Vibration source

85 Switching signal generation circuit

90 Mobile phone

Claims (11)

A coupling body in which the piezoelectric element and the drive shaft are coupled;
A fixed-side member engaged with the drive shaft while being slidable in the longitudinal direction of the drive shaft;
A moving object to which the drive shaft is fixed, through an adhesive having a hardness of at least Shore D60,
A drive device comprising: The moving object includes a support portion that supports the drive shaft,
The drive device according to claim 1, wherein the support portion is fixed to the drive shaft via the adhesive.   The drive apparatus according to claim 1, wherein the moving object includes a plurality of support portions that support the drive shaft.   The drive device according to claim 3, wherein the support portion that is relatively far from the piezoelectric element is fixed to the drive shaft via the adhesive.   The drive device according to claim 3, wherein the support portion relatively close to the piezoelectric element is fixed to the drive shaft via the adhesive.   6. The piezoelectric element and the drive shaft are fixed to each other by the adhesive that fixes the support portion and the drive shaft that are relatively close to the piezoelectric element. The driving device according to any one of the above.   The drive device according to any one of claims 1 to 6, wherein the adhesive is an epoxy resin.   The driving apparatus according to claim 1, wherein the moving object is a lens holder that holds a lens. A drive device according to claim 8;
Imaging means for capturing an image input via the lens;
A camera module comprising: A coupling body in which the piezoelectric element and the drive shaft are coupled;
A lens holder that holds at least one lens and to which the drive shaft is fixed via an adhesive having a hardness of at least Shore D60;
Lens parts comprising. A coupling body in which the piezoelectric element and the drive shaft are coupled;
A lens holder that holds at least one lens and to which the drive shaft is fixed via an adhesive having a hardness of at least Shore D60;
Imaging means for capturing an image input via the lens;
A camera module comprising:

Images