fig1 is a plan view showing a first embodiment of the drive device of the present invention . fig2 is a cross - sectional view along a -- a of the drive device in fig1 . fig3 is a perspective view specifically showing a configuration of a vibration actuator of the drive device according to the first embodiment . in the present description , the drive device is explained using as examples an information recording and processing device for mounting and driving an information recording medium such as a cd ( compact disk ), md ( mini disk ), dvd ( digital video disk ), and ld ( laser disk ), and reading / writing information on that information recording medium . base 1 is a one - piece fixed member , e . g ., a part of the case ( housing ) of the information recording and processing device . an axis ( or shaft ) 2 is attached to the base 1 . the axis 2 supports a disk 3 so that disk 3 is capable of rotation . disk 3 can be a turntable for mounting an information recording medium . axes ( or shafts ) 4a and 4b also are attached to base 1 . a lever 6a is attached to axis 4a and is capable of rotation about axis 4a . also , a lever 6b is attached to axis 4b and is capable of rotation about axis 4b . a roller 8a is attached by an axis ( or shaft ) 7a to the other end of lever 6a and is capable of rotation about axis 7a . also , a roller 8b is attached by an axis ( or shaft ) 7b to the other end of lever 6b and is capable of rotation about axis 7b . by this configuration , lever 6a is capable of rotating centered on axis 4a on a surface substantially parallel to the surface orthogonal to axis 2 . also , lever 6b is capable of rotating centered on axis 4b on a surface substantially parallel to the surface orthogonal to axis 2 . therefore , roller 8a is supported centered on axis 4a so as to be capable of rotating ( swinging ) in the direction indicated by arrow p1 . also , roller 8b is supported centered on axis 4b so as to be capable of rotating ( swinging ) in the direction indicated by arrow p2 . roller 8a and disk 3 are in contact with each other on their respective sides ( outer surfaces ). also , roller 8b and disk 3 are in contact with each other on their respective sides ( outer surfaces ). also , roller 8a and disk 3 , and roller 8b and disk 3 , are configured so as to rotate integrally ( i . e ., together ). axis 2 and axes 7a and 7b are disposed substantially parallel to each other . vibration actuator 100 includes a rectangular flat elastic member 10 , a piezoelectric element 11 , which is an electromechanical conversion element , attached ( e . g ., bonded ) to the elastic member 10 , sliding members 12a and 12b attached ( e . g ., bonded ) to the force output portions of elastic member 10 , and a pressing member ( a spring ) 13 , and the like . the vibration actuator is configured such that , when a first drive signal having a specified frequency and voltage and a second drive signal having a different phase from the first drive signal are applied to piezoelectric element 11 , a first - order longitudinal vibration , vibrating in the lengthwise direction of the elastic member 10 , and a fourth - order bending vibration are generated in the elastic member 10 . in the present embodiment , vibration actuator 100 is a so - called ultrasonic motor using vibrations in the ultrasonic region . such ultrasonic motors are known and are disclosed , for example , in &# 34 ; longitudinal l1 - bending b4 mode flat - plate motor ,&# 34 ; disclosed in &# 34 ; 222 piezoelectric linear motors for application to driving a light pick - up element ,&# 34 ; 5th symposium on dynamics related to electromagnetic force , collected papers , pages 393 - 398 , in japanese laid - open patent application no . 7 - 143770 , and in u . s . pat . application ser . no . 08 / 377 , 466 ( which is based on jp7 - 143770 ). vibration actuator 100 includes grooves 10a and 10b on both sides of elastic member 10 , as shown in fig3 . also , as shown in fig2 ( which is a cross - sectional view along a -- a in fig1 ) and fig3 a pin 15a attached to the flange 1a of base 1 is inserted into groove 10a . also , a pin 15b attached to the flange 1a of base 1 is inserted into groove 10b . accordingly , vibration actuator 100 is supported so as to be capable of moving only in the direction of pins 15a and 15b . pressing member 13 is a plate - shaped spring member for pressing vibration actuator 100 in the direction of disk 3 . this pressing direction is established in a direction substantially orthogonal to the axis of rotation 2 of disk 3 . the pressing member 13 is disposed between vibration actuator 100 and the flange 1a of base 1 . also , a contact member 14 is attached to pressing member 13 . pressing member 13 is in contact with vibration actuator 100 via contact member 14 . the portions of elastic member 10 where the antinodes of the bending vibration generated in elastic member 10 are located function as force output members . when a fourth - order bending vibration is generated in elastic member 10 , the antinodes of the bending vibration are formed in six locations including both ends of elastic member 10 . in the case of the present embodiment , sliding members 12a and 12b are provided in two such places where the antinodes are located along the longitudinal direction excluding the aforementioned both ends . sliding member 12a also is disposed in the position where elastic member 10 contacts roller 8a . sliding member 12b also is disposed in the position where elastic member 10 contacts roller 8b . by such placement , when pressing member 13 pushes elastic member 10 in the direction of disk 3 , sliding member 12a and roller 8a come into contact , and sliding member 12b and roller 8b come into contact . as a result , roller 8a and disk 3 come into contact , and roller 8b and disk 3 also come into contact . vibration actuator 100 , roller 8a , and disk 3 are disposed in sequence next to each other on the identical plane substantially orthogonal to axis 2 of disk 3 , as shown in fig2 . roller 8b is not illustrated in fig2 but is disposed in the same manner substantially on the identical plane . next , the operation of the drive device according to the first embodiment is explained . a drive circuit ( not illustrated ) is connected to piezoelectric element 11 to apply alternating current voltage to the piezoelectric element 11 . the drive circuit generates a first alternating current voltage ( first drive signal ) having a specified frequency and voltage and a second alternating current voltage ( second drive signal ) having a frequency and voltage equal to the first alternating current voltage and having a different phase . when the first alternating current voltage and second alternating current voltage are applied , piezoelectric element 11 generates a first - order longitudinal vibration and a fourth - order bending vibration in the elastic member 10 , as described before . as a result , sliding members 12a and 12b provided on the force output members of the elastic member 10 move in an elliptical path ( i . e ., perform elliptical movement ). because sliding member 12a performs an elliptical movement , roller 8a in contact with this sliding member 12a rotates centered on axis 7a . also , because sliding member 12b performs an elliptical movement , roller 8b rotates centered on axis 7b . these rollers 8a and 8b rotate in the identical direction ( for example , in the clockwise direction indicated by arrow q in fig1 ). at this time , disk 3 in contact with rollers 8a and 8b rotates in the reverse direction to rollers 8a and 8b centered on its axis 2 ( for example , in the counterclockwise direction indicated by arrow r in fig1 ). the direction of rotation and speed of rotation of disk 3 can be varied by changing the phase between the first alternating current voltage and the second alternating current voltage applied to piezoelectric element 11 , or the frequency , or the voltage , or the like . according to the first embodiment , disk 3 can be driven to rotate by pressing vibration actuator 100 in contact with the side of disk 3 in a direction substantially orthogonal to axis 2 . therefore , vibration actuator 100 , rollers 8a and 8b , and disk 3 can be disposed on the identical plane substantially orthogonal to axis 2 of disk 3 . by this construction , it is possible to make the overall device compact in the direction of the axis 2 of disk 3 . also , the driving force generated by vibration actuator 100 is propagated efficiently to disk 3 by rollers 8a and 8b following the movement of disk 3 . if , for example , the length of elastic member 10 ( refer to fig1 ) is made to be 25 mm , the width of elastic member 10 ( refer to fig3 ) can be about 5 mm . also , the length of the flange 1a of base 1 ( that is , the width of the device ) can be made to be about 7 - 8 mm . fig4 is a plan view showing a second embodiment of the drive device of the present invention . in each embodiment explained below , the identical symbols are assigned to the parts serving the same functions as in the first embodiment described before . accordingly , redundant explanation thereof is omitted . the second embodiment has a different support mechanism for rollers 8a and 8b compared with the first embodiment . a lever 21 is attached so as to be capable of rotation ( swinging ) by rotatably attaching one of its ends to an axis ( shaft ) 20 attached to base 1 . also , an axis ( shaft ) 24 is attached to the other end of lever 21 . a lever 22 is attached to axis 24 so as to be capable of rotation relative to lever 21 about axis 24 . axes ( shafts ) 23a and 23b are attached to both ends of lever 22 . roller 8a is attached to axis 23a so as to be capable of rotation . roller 8b is attached to axis 23b so as to be capable of rotation . also , roller 8a is in contact with sliding member 12a of vibration actuator 100 , and roller 8b is in contact with sliding member 12b of vibration actuator 100 . furthermore , rollers 8a and 8b are in contact with the ( outer ) side of disk 3 . disk 3 is configured so as to be driven to rotate by vibration actuator 100 in the same manner as in the first embodiment . in the second embodiment , axis 2 and axes 23a and 23b are disposed substantially parallel to each other . also , vibration actuator 100 , rollers 8a and 8b , and disk 3 are disposed on the identical plane substantially orthogonal to axis 2 of disk 3 , in the same manner as in the first embodiment ( refer to fig2 ). according to the second embodiment , levers 21 and 22 can be made longer compared with levers 6a and 6b in the first embodiment . therefore , it becomes easy for rollers 8a and 8b to follow the movement of disk 3 , making the operation more stable . fig5 is a plan view showing a third embodiment of the drive device of the present invention . fig6 is a cross - sectional view along b -- b of the drive device in fig5 . the third embodiment uses a cylindrical member 30 instead of the disk 3 of the first embodiment . also , as opposed to the first embodiment in which disk 3 is supported by axis 2 disposed in its center , the third embodiment differs in that the cylindrical member 30 is supported by two rollers 17a and 17b mounted so as to be capable of rotation . roller 17a is rotatably provided on axis ( shaft ) 16a provided on base 1 , and roller 17b is provided so as to be capable of rotating on axis ( shaft ) 16b . these rollers 17a and 17b are disposed so as to come in contact with the outer perimeter of cylindrical member 30 . also , roller 17a is disposed in a position symmetrical to the center of roller 8b and cylindrical member 30 . similarly , roller 17b is disposed in a position symmetrical to the center of roller 8a and cylindrical member 30 . in other words , a line passing through the centers of rollers 17a and 8b also passes through the center of rotation of cylindrical member 30 . the same is true for a line passing through the center of rollers 17b and 8a . by such placement , stable support and pressing can be performed in relation to cylindrical member 30 . according to the third embodiment , member 30 can be supported stably even when configured so as to be pressed from the side by vibration actuator 100 . also , the space in the center part of cylindrical member can be used for placing the control circuit , and the like , on base 1 . this is an advantage in that the freedom of design ( layout ) is increased . furthermore , because the center part of member 30 is not fixed , that center part can be used as a recording area . this design also is an effective structure when a disk - shaped information recording medium is used instead of the cylindrical member 30 . in other words , the third embodiment can easily be used to directly drive a recording medium disk in that the disk can be substituted for cylindrical member 30 . fig7 is a plan view showing a fourth embodiment of the drive device of the present invention . fig8 is a cross - sectional view along c -- c of the drive device in fig7 . the fourth embodiment differs from the first embodiment in that sliding members 12a and 12b are not provided on elastic member 10 of vibration actuator 100 . the fourth embodiment is preferred when disk 3 and elastic member 10 are made of metal and rollers 8a and 8b are made of resin , and the like . fig9 is a plan view showing a fifth embodiment of the drive device of the present invention . fig1 is a cross - sectional view along d -- d of the drive device in fig9 . in the fifth embodiment , a grooved space s is provided on the inside of disk 3 , formed in the direction of the perimeter , as shown in fig1 . thus , disk 3 is cup - shaped . the drive unit is made compact compared to the first embodiment . other than size , however , the drive unit is the same as that of the first embodiment and includes vibration actuator 100 , pressing member 13 , pin 15 , rollers 8a and 8b , and levers 6a and 6b , and the like . the drive unit is disposed in space s of disk 3 . referring to fig1 , roller 8a is in contact with a sliding member 12a of vibration actuator 100 and with a curved surface 3a ( i . e ., a radially inward facing surface ) on the inner surface of the outer perimeter of space s of disk 3 . in the present embodiment , the direction in which pressing member 13 pushes vibration actuator 100 is the direction away from the center of disk 3 . in the fifth embodiment , the driving force generated by vibration actuator 100 is propagated via rollers 8a and 8b to curved surface 3a on the outer perimeter of space s formed in disk 3 . thus , disk 3 is driven to rotate . according to the fifth embodiment , because disk 3 is driven from the inside , it is possible to make the device compact even in the planar direction . this structure is particularly suitable when the diameter of the driven disk 3 is large . fig1 is a plan view showing a sixth embodiment of the drive device according to the present invention . fig6 has the drive unit previously described disposed in a corner of base 1 having a rectangular plane surface . accordingly , the dead space created in the rectangular ( e . g ., square ) base 1 and disk 3 can be utilized effectively . fig1 is a plan view showing a seventh embodiment of the drive device of the present invention . in fig1 , for the sake of explanation , one part of disk 3 is shown in a cut - open state . fig1 is a cross - sectional view along e -- e of the drive device in fig1 . in the seventh embodiment , disk 3 is constituted by a first part 3b having a large diameter and a second part 3c having a smaller diameter than part 3b . also , rollers 8a and 8b are in contact with the outer perimeter of the second part 3c . in the configuration of the seventh embodiment , when the identical drive unit ( as the first embodiment ) is used and the diameter of the first part 3b of disk 3 is set to the same size as the diameter of disk 3 of the first embodiment , the diameter of rollers 8a and 8b are set larger than in the first embodiment . therefore , the speed of rotation of disk 3 can be raised compared with the first embodiment . because rollers 8a and 8b are not effected by the speed of rotation of disk 3 , that speed may be set suitably in the design , considering the space of the device , and the like . as explained in detail above , according to the present invention , by pressing the vibration actuator in contact in a direction substantially orthogonal to the axis of the driven member from the side of the driven member , the driven member can be driven to rotate . therefore , the vibration actuator , roller member , and driven member can be disposed on the identical plane substantially orthogonal to the axis of rotation of this driven member , and it becomes possible to make the device compact in the direction of the axis of the driven member . also , the present invention is not limited to the embodiments explained above . various modifications and variations are possible . for example , in each embodiment , the disk 3 functioned as a turntable . however , when the information recording medium is fabricated from a hard material , the information recording medium may be directly driven to rotate , like the disk 3 . in this case , a mechanism for clamping the disk 3 should be provided that is capable of rotation . also , as long as no logical contradictions are caused , the characteristics of each embodiment can be combined with other embodiments . for example , other than for the fourth embodiment , the sliding member can be omitted . also , the structure of the drive unit of the second embodiment can be applied to the placement of the drive unit of the fourth and fifth embodiments . the described vibration actuator used a first - order longitudinal vibration and a fourth - order bending vibration ( l1 - b4 type ). the invention is not limited to this type of actuator . for example , the vibration actuator may also be made in a configuration using a sixth - order bending vibration ( l1 - b6 type ), or the like . additionally , a piezoelectric member was used as the electromechanical conversion element . the invention is not limited to this type of electromechanical conversion element . the invention is applicable to other devices that convert electrical energy into mechanical displacement . for example , an electrostrictive element may be used instead of the piezoelectric member . while this invention has been described in conjunction with specific embodiments thereof , it is evident that many alternatives , modifications and variations will be apparent to those skilled in the art . accordingly , the preferred embodiments of the invention set forth herein are intended to be illustrative , not limiting . various changes may be made without departing from the spirit and scope of the invention as defined in the following claims .