JP2004364490A - Small drive device for operating driven mechanism, drive device for optical lens using the same, and optical lens unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a small driving device that is thin, while enabling enhancement of power. <P>SOLUTION: The drive device comprises a two-pole step motor 9 formed, by planarly disposing a rotor 4, comprising two-pole permanent magnets, a two-pole stator 3 that has a rotor hole 3a, into which the rotor is to be inserted and is magnetically coupled with the rotor 4, and a coil 2 secured to this stator 3; a torque-increasing gear train 10 that transmits the rotation of the rotor 4 of the two-pole step motor 9; and a rotational output shaft 7a, provided at the end of the torque increasing gear train 10. The driving device makes a driven mechanism operated by the rotational output shaft 7a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention uses a two-pole step motor to drive a driven mechanism by a rotary output shaft, and a small driving device. Further, the present invention uses a two-pole step motor to move a lens of an optical lens mechanism. The present invention relates to an optical lens driving device and an optical lens unit thereof.

  Conventional electromagnetic drive motors have been required to be downsized. To cope with this, the stacking of the stator may be abolished and the thickness of the rotor may be reduced, but a shortage of motor power poses a problem. Thus, as an electromagnetic drive motor, a first outer portion having a small diameter and a second outer portion having a large diameter are provided on the outer portion of the rotor, and the first outer portion is provided in a direction perpendicular to the rotation axis direction of the rotor. And an end face portion connecting the second outer diameter portion, a first magnetized portion on the outer periphery of the first outer diameter portion, and a second magnetized portion on the end face portion, each having the same polarity. The magnetic poles of the first stator and the magnetic pole of the second stator are formed in a predetermined gap with respect to the first and second magnetized portions. (See, for example, Patent Document 1).

  In addition, in order to shorten the axial length of the cylindrical motor, a gear portion on the outer peripheral surface is divided in the circumferential direction and magnetized alternately at different poles, and is provided with a magnet rotatable around the rotation axis. There is also a drive motor in which a coil is arranged in an axial direction, and a stator is provided in which an outer magnetic pole part excited by the coil and an inner magnetic pole part oppose an outer peripheral surface and an inner peripheral surface of the magnet (for example, see Patent Document 2).

  As a conventional optical lens driving device, a cylindrical coil is fixed to a holding member surrounding the periphery of the optical lens, and a cylindrical yoke holding a cylindrical magnet opposed thereto is fixed to an outer housing. (See, for example, Patent Literature 3, Patent Literature 4, and Patent Literature 5).

In order to shorten the axial length of the cylindrical motor as a driving device for the aperture blades and the like, it is divided in the circumferential direction of the gear portion on the outer peripheral surface and magnetized alternately on different poles, and rotates around the rotating shaft. There is disclosed a drive motor comprising a possible magnet, a coil disposed in the axial direction of the magnet, and a stator having an outer magnetic pole portion and an inner magnetic pole portion excited by the coil, the stator being opposed to the outer and inner peripheral surfaces of the magnet. (For example, see Patent Document 6).
JP-A-2002-369488 (page 1 abstract, page 4, column 5, paragraph 0017 to column 6, paragraph 0028, FIG. 2) JP 2001-298938 A (Page 4, column 5, paragraph 0025 to column 7, paragraph 0036, FIGS. 2 to 4) Japanese Patent Publication No. Hei 6-93056 (Page 2, column 3, line 32 to column 4, line 7, FIG. 1 and FIG. 2) JP-A-7-239439 (page 4, column 6, paragraph 0026 to page 5, column 8, paragraph 0040, FIGS. 1 to 5) JP-A-7-244234 (page 5, column 7, paragraph 0025 to column 8, paragraph 0039; FIGS. 1 to 5) JP 2001-298938 A (Page 4, column 5, paragraph 0025 to column 7, paragraph 0036, FIGS. 2 to 4)

  However, in the example of the conventional patent document 1, the power of the motor is increased by generating the motor power at two places of (the amount of magnetic flux of the first magnetized portion) + (the amount of magnetic flux of the second magnetized portion). However, since the first outer diameter portion and the second outer portion are laminated on the rotor, the thickness of the rotor is not sufficiently reduced, and it is difficult to manage the air gap between the rotor and the stator. Had become. Further, in the example of the conventional patent document 2, since the coils and the magnets corresponding to the rotor are arranged in a laminated manner in the axial direction, the axial thickness of the motor is not reduced. Therefore, an object of the present invention is to provide a small-sized drive device that can be made thinner and power-up as a whole. Further, the conventional optical lens driving devices disclosed in Patent Documents 3 to 5 can sufficiently output power because the motor is arranged on the entire outer periphery of the lens, but the outer housing of the lens becomes large and the design is limited. Cheap. Further, the diaphragm blade driving device of Patent Document 6 described above has a cylindrical shape having a long length because the magnets corresponding to the coil and the rotor are arranged in a laminated manner in the axial direction. Needs to be done, and there are restrictions on the design. Accordingly, it is an object of the present invention to provide a small optical lens driving device that can be made thin and power-up as a whole.

  In order to solve the above-mentioned problems, according to the present invention, a rotor composed of a two-pole permanent magnet, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator A two-pole step motor having a two-pole step motor, a torque increasing gear train transmitting rotation of the rotor of the two pole step motor, and a rotation output shaft provided at an end of the torque increasing gear train. A small driving device for operating the driven mechanism by the output shaft. As a result, it is possible to provide a small-sized drive device that is thin and can be improved in power.

  In addition, a two-pole step motor, wherein the rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is provided with a rotor hole in which the rotor enters so as to face one of the permanent magnets. A second opposing portion provided with a rotor hole in which the rotor enters in opposition to the opposing portion and the other of the permanent magnets, wherein the two coils are arranged in a plane and a torque increasing gear train is arranged therebetween. If a small drive device for operating the driven mechanism is used, the rotor has twice the holding force at the time of non-excitation as compared with one magnet, and the moment of inertia can be suppressed as compared with the case of using a magnet having a large volume in a plane. Drilling at the center is easier than using an integral magnet of the same volume and diameter. Since the rotor pinion is between the magnets, the burden on the tenon and the loss of friction during gear transmission are reduced. As compared with a case where a single stator having the same thickness is used, the stator has a coil core at the center of the thickness and a thinner structure. Vortex loss can be reduced by separating the stator up and down. By arranging the gear train (gear mechanism) between two pairs of coils, the overall length of the motor gear device can be reduced.

  Further, a small driving device for operating a driven mechanism having the rotor hole formed in the stator such that a stable position of the rotor when the coil is excited is different from a stable position of the rotor when the coil is not excited. Then, the rotation direction can be determined while using a one-coil bipolar step motor whose rotation direction is easily determined.

  A two-pole step in which a rotor composed of two-pole permanent magnets, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are arranged in a plane. A motor, a torque increasing gear train for transmitting rotation of the rotor of the two-pole step motor, a drive for supplying a drive current to a rotation output shaft provided at an end of the torque increasing gear train, and a coil of the two-pole step motor A small driving device for operating a driven mechanism by the rotary output shaft, comprising a circuit and a control circuit for controlling the driving circuit and supplying a driving signal to the driving circuit. It can be a small driving device that can be achieved.

  Further, the control circuit applies a step pulse signal having a width that does not rotate the rotor by one step to the coil via the drive circuit, and then applies a step pulse signal in the reverse direction, thereby causing the rotor to rotate in the reverse direction. If a small driving device is used to operate the driven mechanism that rotates the motor in the reverse direction, reverse driving can also be performed.

  Further, if a small driving device for operating a driven mechanism provided with a back electromotive current detection circuit for detecting an induced current generated in the coil due to the rotational movement of the rotor, rotation detection can be performed, and the device is originally open. The step motor for control can perform semi-closed control in which rotation is detected and whether or not rotation is performed is determined, and control accuracy can be increased. In addition, it is also possible to appropriately select a drive waveform having the minimum amount of power required for rotational driving, which contributes to lower power consumption.

  In addition, the control circuit detects the rotational position of the rotor based on the induced current detected by the back electromotive current detection circuit, and determines the timing of the next drive signal according to the rotational position of the rotor. , A high-speed rotation of, for example, 100 pps (pulses / second) or more can be efficiently performed without waiting for the rotor to stop, so that it can be continuously performed without providing a stop stabilization time. A driving pulse is applied to enable high-speed driving.

  With a small drive device for operating a driven mechanism including a slip mechanism in the gear train between the rotary output shaft or the rotor and the rotary output shaft, if an excessive load of an external factor applied to the rotary output shaft, The provision of the torque limit mechanism can prevent gears and the like from being damaged.

  Further, if a small drive device for operating a driven mechanism having a reverse transmission prevention mechanism in a gear train between the rotor and the rotation output shaft is provided, it is easy to handle an external load such as an impact applied to the rotation output shaft. The rotation of the gear or the rotor can be prevented.

  Further, if a small drive device for operating a driven mechanism provided with a feed screw mechanism provided with a feed screw and a member meshing with the feed screw connected to the rotary output shaft, not only as a rotary actuator, An actuator suitable for linear driving can also be used.

  Further, when the back electromotive current detection circuit detects an induced current generated in the coil due to the rotational movement of the rotor when the rotor is not driven by the control circuit, the control circuit prevents the rotation of the rotor. Drive device that outputs a drive signal for operating the drive mechanism, an unexpected load is determined at the time of starting rotation of the rotor and a holding pulse is issued when an external load such as an impact applied to the output shaft is started. This makes it possible to increase the holding torque characteristics.

  A power supply voltage detection circuit for detecting a change in the power supply voltage due to a change in the power supply voltage or a change in the load torque; and when the power supply voltage detection circuit detects the change in the power supply voltage, the control circuit sets the drive circuit to A small drive device for operating a driven mechanism that changes the output waveform of a drive signal to the drive signal enables low-voltage or low-temperature drive, and can also reduce power consumption in a normal state. .

  Further, if the control circuit is a small-sized drive device for operating a driven mechanism that determines a form of a next drive signal based on an induced current detected by the back electromotive current detection circuit after outputting a drive signal, In addition, it is possible to cope with sudden overload driving and to reduce power consumption in a normal state.

  In another aspect of the present invention, in order to solve the above-described problems, a rotor composed of a two-pole permanent magnet, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, A two-pole step motor in which coils fixed to a stator are arranged in a plane, a reduction gear train for reducing the rotation of the rotor of the two-pole step motor, and a conversion for converting the rotation of the reduction gear train into linear movement Means, an optical lens moved by the conversion means, a lens mechanism for holding the optical lens movably in the center line direction, a drive circuit for supplying a drive current to the coil of the two-pole step motor, A drive circuit for controlling the drive circuit and supplying a drive signal to the drive circuit. This makes it possible to provide a small-sized optical lens driving device that can be made thin and can be improved in power.

  In addition, a two-pole step motor, wherein the rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is provided with a rotor hole in which the rotor enters so as to face one of the permanent magnets. A second opposing portion provided with a rotor hole in which the rotor enters in opposition to the other of the opposing portion and the permanent magnet, wherein the two coils are arranged in a plane and a reduction gear train is arranged therebetween. With the optical lens drive device, the rotor has twice the holding force at the time of non-excitation compared to a single magnet, and the moment of inertia is suppressed compared to using a magnet with a large volume in a plane. Drilling in the center is easier than using magnets. Since the rotor pinion is between the magnets, the burden on the tenon and the loss of friction during gear transmission are reduced. As compared with a case where a single stator having the same thickness is used, the stator has a coil core at the center of the thickness and a thinner structure. Vortex loss can be reduced by separating the stator up and down. By arranging the gear train (gear mechanism) between two pairs of coils, the overall length of the motor gear device can be reduced.

  Further, if the drive device of the optical lens in which the rotor hole of the stator is formed such that the stable position of the rotor when the coil is excited and the stable position of the rotor when the coil is not excited is different, However, the rotation direction can be determined while using a two-pole step motor that is easily determined.

  Further, if the driving device for the optical lens is provided with a slip mechanism between the rotor and the conversion means, the torque limit mechanism can be used to protect the gears and the like from damage due to an external load applied to the conversion means and the like. Can be prevented.

  Further, if the driving device for the optical lens is provided with a reverse transmission preventing mechanism between the rotor and the conversion means, the gear or the rotor can be easily rotated with respect to an external load such as an impact applied to the conversion means and the like. Can be prevented.

  In addition, the control circuit applies a step pulse signal having a width such that the rotor does not rotate by one step to the coil via the drive circuit, and then applies a step pulse signal in the reverse direction, thereby causing the rotor to rotate in the reverse direction. In the case of a driving device for an optical lens that rotates the lens in a reverse direction, reverse rotation driving can also be performed.

  Further, if the driving device of the optical lens is provided with a back electromotive current detection circuit that detects an induced current generated in the coil due to the rotational motion of the rotor, rotation detection can be performed, and a step motor originally open control, Rotation detection enables semi-closed control, increasing control accuracy. In addition, it is possible to appropriately select a drive waveform having the minimum amount of electric power required for the rotation drive, thereby contributing to low power consumption.

  Further, the control circuit detects the rotational position of the rotor based on the induced current detected by the back electromotive current detection circuit, and determines the timing of the next drive signal in accordance with the rotational position of the rotor. With the drive device, high-speed rotation of, for example, 100 pps (pulses / second) or more can be efficiently performed without waiting for the rotor to stop, so that a drive pulse can be continuously applied without providing a stop stabilization time. Speed drive becomes possible.

  Further, if the control circuit is a drive device of an optical lens that determines the form of the next drive signal based on the induced current detected by the back electromotive current detection circuit after outputting the drive signal, sudden overload It is possible to cope with driving and to reduce power consumption in a normal state.

  A power supply voltage detection circuit for detecting a change in the power supply voltage due to a change in the power supply voltage or a change in the load torque; and when the power supply voltage detection circuit detects the change in the power supply voltage, the control circuit sets the drive circuit to If the driving device of the optical lens changes the output waveform of the driving signal to the optical lens, the driving at a low voltage or low temperature can be performed, and the power consumption in a normal state can be reduced.

  Further, when the counter electromotive current detection circuit detects an induced current generated in the coil due to the rotational movement of the rotor when the rotor is not driven by the control circuit, the control circuit prevents the rotation of the rotor. The drive device of the optical lens that outputs the drive signal for the purpose is to determine the unexpected behavior at the time of starting the rotation of the rotor against the external load such as the impact applied to the output shaft, and to output the holding pulse, thereby improving the holding torque characteristics. It is possible to raise.

  A two-pole step in which a rotor composed of two-pole permanent magnets, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are arranged in a plane. A motor, a reduction gear train for reducing the rotation of the rotor of the two-pole step motor, conversion means for converting the rotation of the reduction gear train into linear movement, an optical lens moved by the conversion means, and the optical lens And a lens mechanism for holding the lens unit so as to be able to move linearly in the direction of the center line, thereby providing a small-sized optical lens driving device that is thin and can be improved in power.

  In addition, a two-pole step motor, wherein the rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is provided with a rotor hole in which the rotor enters so as to face one of the permanent magnets. A second opposing portion provided with a rotor hole in which the rotor enters in opposition to the other of the opposing portion and the permanent magnet, wherein the two coils are arranged in a plane and a reduction gear train is arranged therebetween. In the optical lens unit described above, the rotor has twice the holding force at the time of non-excitation as compared with a single magnet. Drilling in the center is easier than using. Since the rotor pinion is between the magnets, the burden on the tenon and the loss of friction during gear transmission are reduced. As compared with a case where a single stator having the same thickness is used, the stator has a coil core at the center of the thickness and a thinner structure. Vortex loss can be reduced by separating the stator up and down. By arranging the gear train (gear mechanism) between two pairs of coils, the overall length of the motor gear device can be reduced.

  Further, if the rotor lens hole is formed in the stator such that the stable position of the rotor when the coil is excited is different from the stable position of the rotor when the coil is not excited, the rotation direction is simple. The rotation direction can be determined even though the motor is a two-pole step motor.

  In addition, if the optical lens unit is provided with a slip mechanism between the rotor and the conversion means, it is possible to prevent gears and the like from being damaged by having a torque limit mechanism against an excessive load due to an external factor applied to the conversion means and the like. be able to.

  Further, if the optical lens unit is provided with a reverse transmission preventing mechanism between the rotor and the conversion means, it is possible to prevent the gears or the rotor from being easily rotated by an external load such as an impact applied to the conversion means. it can.

  In the above description, the gear train was described as a torque increasing gear train transmitting the rotation of the rotor in a small driving device for operating the driven mechanism, and as a reduction gear train in the optical lens driving device and the optical lens unit. However, these actions are the same, and have only changed their names according to their purpose.

  As described above, according to one embodiment of the present invention, a rotor composed of a two-pole permanent magnet, a two-pole stator magnetically coupled to the rotor having a rotor hole into which the rotor enters, and a coil fixed to the stator And a torque increasing gear train transmitting the rotation of the rotor of the two-pole step motor, and a rotation output shaft provided at the end of the torque increasing gear train. Since the drive mechanism is operated, it is possible to obtain a small-sized drive device that can be arranged in a thin shape and can increase power to the rotary output shaft by the torque increasing gear train.

  According to another aspect of the present invention, there is provided a rotor having two two-pole permanent magnets sandwiching a rotor pinion, and a first opposing portion provided with a rotor hole into which the rotor enters so as to face one of the permanent magnets. A two-pole step in which a two-pole stator magnetically coupled to the rotor and having a second facing portion provided with a rotor hole into which the rotor enters so as to face the other of the permanent magnets, and two coils are arranged in a plane. A driven mechanism comprising a motor, a torque increasing gear train disposed between two stator coils transmitting rotation of a rotor of a two-pole step motor, and a rotation output shaft provided at an end of the torque increasing gear train. In order to operate, a small-sized drive device that can be arranged in a thin shape and that can increase power to a larger output shaft can be obtained.

  Further, according to another aspect of the present invention, a rotor comprising a two-pole permanent magnet, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are provided. A two-pole step motor arranged in a plane, a reduction gear train for reducing the rotation of the rotor of the two-pole step motor, conversion means for converting the rotation of the reduction gear train into linear movement, and an optical lens moved by the conversion means And a lens mechanism for holding the optical lens so as to be able to move linearly in the direction of its center line, thereby enabling a thin arrangement and power-up by a reduction gear train. You can get units.

  Further, according to another aspect, a rotor having two two-pole permanent magnets sandwiching a rotor pinion, a first facing portion provided with a rotor hole into which the rotor enters in opposition to one of the permanent magnets, and a permanent magnet are provided. A two-pole step motor in which a two-pole stator magnetically coupled to the rotor and having a second facing portion provided with a rotor hole into which the rotor enters in opposition to the other, and two coils arranged in a plane, A reduction gear train arranged between two stator coils for transmitting rotation of a rotor of a two-pole step motor, a conversion means for converting rotation of the reduction gear train into linear movement, an optical lens moved by the conversion means, A lens mechanism for holding the optical lens movably in the direction of the center line thereof, thereby enabling a thin arrangement and a small optical lens driving device and an optical lens that can be powered up by a reduction gear train. It is possible to obtain the unit's.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory plan view of a schematic configuration of a small-sized driving device for operating a driven mechanism according to a first embodiment of the present invention. Related control / driving circuits are also described as block diagrams for explanation. FIG. 2 is an elevational sectional view of a small driving device for operating the driven mechanism of FIG. FIG. 3 is a block diagram of a control / driving circuit of a small driving device for operating the driven mechanism of FIG.

  1 to 3, a small-sized driving device for operating a driven mechanism according to a first embodiment of the present invention includes a two-pole step motor 9 and a torque increasing gear train 10 in a housing 1. Although the circuit can be housed in the housing 1 or mounted on the housing 1, an example outside the housing 1 is conceptually shown here. In particular, it is often desirable to house the drive circuit 12 of the circuit section 20 in the housing 1. Further, the circuit section 20, the oscillation circuit 13, the power supply 14, and the control signal input means 15 can also be mounted on the housing 1 or the housing 1 can be accommodated in a larger size. Obviously, these arrangements can be freely selected in design according to the application of the small drive.

  The two-pole step motor 9 includes a rotor 4 composed of a two-pole permanent magnet, a two-pole stator 3 having a rotor hole 3a into which the rotor 4 is inserted, and magnetically coupled to the rotor 4, a coil 2a fixed to the stator 3, 2b, which are arranged in a plane. The coils 2a and 2b are separated from each other and wound around the stator 3. However, the outer diameter of the coils increases, but one coil may be used. The rotor hole 3a into which the rotor 4 of the stator 3 enters is such that the stable position of the rotor 4 when the coils 2a and 2b are excited is different from the stable position of the rotor 4 when the coils 2a and 2b are not excited. A hole 3a is formed. Here, the rotor hole 3a has projections 3b and 3c at positions at an angle of about 45 degrees with the magnetic pole direction of the stator 3. In the present embodiment, the protrusions 3b and 3c are set at about 45 degrees with respect to the magnetic pole direction of the stator, but are preferably set at 25 to 75 degrees. Further, in the present embodiment, the example in which the protrusions 3b and 3c are provided as the shape of the rotor hole 3a of the stator 3 has been described, but the hole shape of the rotor hole 3a may be a stepped hole shape in which a semicircle is shifted.

  The torque increasing gear train 10 for transmitting the rotation of the rotor 4 and increasing the rotating torque of the rotor 4 includes a first wheel 5 having a rotor pinion 4a, a gear 5b and a pinion 5a, a gear 6b and a pinion 6a. And a third wheel 7 having a gear 7b. A pinion 4a provided below the rotor 4 meshes with a gear 5b of the first wheel 5, and a pinion 5a of the first wheel 5 and the second wheel 5a. The gear 6b of the vehicle 6 meshes, the pinion 6a of the second wheel 6 meshes with the gear 7b of the third wheel 7, and the shaft 7a of the third wheel 7 located at the end of the torque increasing gear train 10 It protrudes upward to become the rotation output shaft 7a. In this embodiment, the number of gear trains is three, but the number of gear trains may be two or four depending on the relationship between the power of the two-pole step motor and the power required by the applied driven mechanism. It is also possible to change the number of gears by changing the rate of increase in torque between the gears, and to adapt to the driving speed and space of the driven mechanism.

  The housing 1 includes a lower housing 1a and an upper housing 1b. The stator 3, the rotor 4, and the torque increasing gear train 10 are sandwiched between upper and lower housings 1a and 1b, and are sandwiched by screws (not shown) or the like. It should be noted that instead of holding with a screw or the like, it may be held with a hook or caulking.

  Terminals of the coils 2a and 2b are connected to connection points 8a and 8b provided on the stator 3, and terminals from the circuit are also connected. This is conceptually shown in FIG. The circuit section 20 includes a drive circuit 12 that supplies a drive current to the coils 2a and 2b of the two-pole step motor 9, and a control circuit 11 that controls the drive circuit 12 and supplies a drive signal to the drive circuit 12. The control circuit 11 operates by receiving a signal from the oscillation circuit 13. It functions by receiving a signal from the control signal input means 15 for inputting an external input such as a button switch. Further, there is a power supply 14 for supplying power to the circuit section 20 and the two-pole step motor 9. The arrangement of these circuits is as described above.

  The control / driving circuit of the small driving device according to the first embodiment will be further described with reference to the block diagram of FIG. 3, in the present embodiment, the circuit section 20 includes a control circuit 11 and a drive circuit 12, and a back electromotive current detection circuit 17 for detecting an induced current generated in the coil due to the rotational movement of the rotor 4. Is provided. Further, a power supply voltage detection circuit 18 for detecting a change in the voltage of the power supply 14 is provided. Further, there is provided a limit switch 23 which detects the movement of the driven body 21 of the driven mechanism 21 and supplies a signal indicating the movement limit of the driven body 21 to the control circuit.

  Next, the operating principle of the two-pole step motor 9 used in this embodiment will be described with reference to FIG. (A) shows a state in which no drive pulse is applied. The stator 33 is provided with a circular rotor hole 33a having protrusions 33b and 33c at a position forming an angle of about 45 degrees with the magnetic pole direction of the stator 33. The coil 32 is wound around the stator 33 at a position opposite to the rotor hole 33a. The terminal of the coil 32 is connected in series with the battery 35 and the switch 36 here for the sake of principle. When the switch 36 is turned on, a voltage is applied to the coil 32, and when the switch 36 is turned off, the applied voltage becomes zero. By the ON and OFF, a driving pulse is given. In the state in which the switch 36 shown in (a) does not apply an OFF drive pulse, the magnetization direction of the rotor 34 indicated by SN is stable in a direction perpendicular to the directions of the protrusions 33b and 33c. Next, when the switch 36 is closed and the magnetic pole SN is generated in the rotor hole 33a of the stator 33 as shown in (b), the magnetic poles repel each other, the different magnetic poles attract each other, and the rotor 34 reaches the position (c). Rotates 135 degrees clockwise. When the switch 36 is turned off again as shown in (d), the rotor 34 is further rotated clockwise by 45 degrees and stabilized. Thus, a rotation of 180 degrees is performed. Next, when the poles of the battery are connected in reverse, that is, when a drive pulse having the opposite polarity is given, the battery rotates clockwise by 180 degrees.

  The operating principle of the two-pole step motor 9 has been described above. A specific driving method of the two-pole step motor 9 used in the present embodiment will be described with reference to FIG.

  FIGS. 5 to 9 are output and detection waveform diagrams of a control / drive circuit in a small drive device for operating the driven mechanism of FIG.

  FIG. 5 shows an example in which a chopper pulse obtained by choppering a drive pulse is given as a drive pulse. A drive pulse for 180-degree rotation includes a chopper pulse 41 and a chopper pulse 42 having a polarity opposite to that of the chopper pulse 41. This is the output waveform from the drive circuit 12 during normal rotation of the two-pole step motor 9 in the present embodiment.

  Note that, here, the width of the output waveform from the drive circuit is t1 about 5 to 7 ms, and t2 is about 1000 ms. Driving in a short time of 5 to 7 ms can reduce power consumption.

  Next, a drive pulse for performing an operation other than a normal operation will be described. FIG. 6 shows an output waveform of a drive circuit for reverse rotation of a two-pole step motor. After the pulse signal 44 is applied, a reverse step pulse signal 45 is applied to attract the rotor 4 to apply a rotational force in the reverse direction. Can be rotated in the opposite direction. After the rotation by 180 degrees, a pulse having a combination of the opposite polarity is similarly applied, and the rotor 4 can be further rotated in the opposite direction by 180 degrees.

  FIG. 7 shows the output waveform of the drive circuit 12 when the rotor 4 is driven to rotate and the timing of detection by the back electromotive current detection circuit 17. The waveform 51 of the current flowing through the coils 2a and 2b when the rotor 4 is rotating is actually as shown in FIG. 7 because the waveform is dripped due to the rotation of the rotor 4. An induced current 52 generated in the coils 2a and 2b is generated by the rotational movement of the rotor 4. When the detection timing pulse 53 indicating the detection timing of the back electromotive current detection circuit 17 and the induced current 52 overlap, the rotation of the rotor 4 is detected. By this rotation detection, semi-closed control in which the step motor which is originally open control detects rotation and determines whether or not there is rotation can be performed, and control accuracy can be increased. It is also possible to detect whether a back electromotive current is generated at a certain timing after the pulse output, and to select a drive waveform of the minimum amount of power required for the rotation drive by the control circuit 11 in a timely manner. Out. This can contribute to lower power consumption.

  FIG. 8 shows a current waveform 51 flowing through the coils 2a and 2b, an induced current 52 generated in the coils 2a and 2b by the rotational movement of the rotor 4, and a detection timing 54 by the back electromotive current detection circuit 17. The control circuit 11 detects the rotation position of the rotor 4 based on the timing at which the back electromotive current detection circuit 17 detects the induced current 52, and determines the start timing of the next drive signal according to the rotation position of the rotor 4. . Thereby, high-speed rotation of, for example, 100 pps (pulses / second) or more can be efficiently performed without waiting for the stop of the rotor 4, and thus a drive pulse is continuously applied without providing a stop stabilization time, and high-speed driving is performed. Becomes possible.

  FIG. 9 shows the waveform of the current flowing through the coils 2a and 2b when the rotor 4 is turned by an external factor, the induced current 52 generated in the coils 2a and 2b by the rotational motion of the rotor 4, and the back electromotive current detection circuit 17. A detection timing 55 and a brake pulse 56 by the drive circuit 12 are shown. When the back electromotive current detection circuit 17 detects the induced current 52a generated in the coils 2a, 2b due to the rotational movement of the rotor 4 when the rotor 4 is not driven by the control circuit 11, the control circuit 11 controls the rotation of the rotor 4 A drive signal (brake pulse) 56 for blocking is output. Thereby, it is possible to improve the holding torque characteristic by judging an unexpected behavior at the time of starting rotation of the rotor 4 and outputting a holding pulse (brake pulse) with respect to an external load such as an impact applied to the rotation output shaft 7a. .

  Further, when the power supply voltage detecting circuit 18 which detects the fluctuation of the power supply voltage due to the fluctuation of the power supply voltage or the fluctuation of the load torque detects the fluctuation of the power supply voltage, the control circuit 11 receives the signal and sends the signal to the drive circuit 12. The output waveform of the drive signal can be changed. For example, when a decrease in the power supply voltage is detected, driving at a low voltage or low temperature can be performed by changing the output waveform such as increasing the pulse width of the driving pulse. In addition, the pulse width in the normal state can be further reduced to reduce power consumption.

  Further, the control circuit 11 can determine the form of the next drive signal based on the induced current detected by the back electromotive current detection circuit 17 after outputting the drive signal, and can cope with sudden overload drive. By adjusting the pulse width of the drive pulse, power consumption in a normal state can be reduced.

  If a slip mechanism such as fitting a cylindrical cover to the rotation output shaft 7a or a gear train between the rotor 4 and the rotation output shaft 7a or using a gear holding the shaft by a spring portion is provided, the rotation output shaft can be used. The provision of the torque limit mechanism can prevent gears and the like from being damaged against an excessive load due to an external factor to be applied.

  If a gear train between the rotor 4 and the rotation output shaft 7a is provided with, for example, a reverse transmission prevention mechanism having a reverse rotation prevention tooth form, the gears can be easily driven by an external load such as an impact applied to the rotation output shaft. The rotation of the rotor can be prevented.

  In addition, if a feed screw mechanism provided with a feed screw and a member that meshes with the feed screw is provided in connection with the rotation output shaft 7a, not only a rotary actuator but also an actuator suitable for linear driving can be obtained.

  According to the first embodiment, the torque-increasing gear train can be arranged in a plane without overlapping the two-pole step motor in cross-section, so that it is possible to reduce the thickness. The power of the two-pole step motor can be increased, and the power can be increased by making the motor thinner.

  Further, by using a two-pole step motor, it is possible to reduce power consumption. In contrast to a conventional DC motor, a two-pole step motor has a constant holding force even when no current is flowing through the coil, and can reduce the power for holding a position to stop and hold at a fixed position. In addition, the two-pole step motor can be configured such that the stator and the coil are formed separately and two-dimensionally, and a wire having a wire diameter of about 10 to 40 μm is wound around 1,000 to 30,000 turns into a rod-shaped coil winding core, and several kilohms. Coil resistance can be prepared, and it can be combined with driving by chopper pulse, and current consumption can be suppressed to about several mA. Compared with current consumption of conventional DC motor (several tens mA) As a result, it is possible to prepare motor conditions advantageous for low power consumption driving.

  If the coil resistance of the two-pole step motor is set to 100 to 1000 Ω, more preferably 400 to 600 Ω, the current flowing into the coil is improved, and the startability of the rotor can be improved. it can.

  Next, a second embodiment according to the present invention will be described.

  FIG. 10 is an explanatory plan view of a schematic configuration of a driving mechanism of a small driving apparatus for operating a driven mechanism according to a second embodiment of the present invention. Related control / drive circuits are omitted. FIG. 11 is an elevational cross-sectional view along the line EE in FIG. FIG. 12 is an elevational sectional view taken along line FF of FIG.

  The small driving device for operating the driven mechanism according to the embodiment shown in FIGS. 10 to 12 is mechanically composed of an upper base 101b, a lower base 101a, and a two-pole step mounted thereon. It comprises a motor 109 and a torque increasing gear train 110 supported between the lower base 101a and the upper base 101b.

  First, the two-pole step motor 109 will be described. The rotor 104 has two two-pole permanent magnets 104a and 104b arranged with the rotor pinion 104c interposed therebetween, and the rotor 104 is opposed to one of the permanent magnets 104a and 104b. A first opposed portion 113a provided with a rotor hole 103a to enter therein and a second opposed portion 113b provided with a rotor hole 103b opposed to the other magnet 104b of the permanent magnets 104a and 104b and into which the rotor 104 enters, and is magnetically coupled to the rotor 104; A two-pole stator 103 and a coil 102 including two coils, a first coil 102a and a second coil 102b, are arranged in a plane. In this embodiment, the coil 102 is separated into two parts, the first coil 102a and the second coil 102b, but may be composed of one coil. The first coil 102a and the second coil 102b are wound around coil cores 102c and 102d, respectively. One end of the coil cores 102c and 102d is sandwiched between the first facing portion 113a and the second facing portion 113b, and the other is sandwiched between the joining portions 113c and 113d of the stator 103. The pillars 101c, 101d implanted in the 101a are fitted and fixed integrally with screws 130a, 130b, 130c, 130d and the like. The first opposing portion 113a and the second opposing portion 113b and the connecting portions 113c and 113d of the stator 103 may be made of the same magnetic material as the coil cores 102c and 102d, or may be made of different magnetic materials according to the characteristics. May be configured.

  The rotor holes 103a and 103b of the stator 103 into which the rotor 104 enters are positioned so that the stable position of the rotor 104 when the coils 102a and 102b are excited is different from the stable position of the rotor 4 when the coils 102a and 102b are not excited. The rotor holes 103a and 103b of 103 are formed. Here, the rotor hole 103a has protrusions 103c and 103d at positions that are approximately 45 degrees with respect to the magnetic pole direction of the stator 103. The same applies to the rotor hole 103b, but is not shown here. In the present embodiment, the projections 103c and 103d are set at approximately 45 degrees with respect to the magnetic pole direction of the stator, but are preferably set at 20 to 75 degrees. Further, in the present embodiment, an example in which the protrusions 103c and 103d are provided as the shape of the rotor hole 103a of the stator 103 has been described, but the hole shape of the rotor hole 103a may be a stepped hole shape with a semicircle shifted. This is the same as described in the first embodiment.

  The torque increasing gear train 110 that transmits the rotation of the rotor 104 of the two-pole step motor is arranged between two coils, that is, between the first coil 102a and the second coil 102b. The torque increasing gear train 110 for transmitting the rotation of the rotor 104 and increasing the rotational torque of the rotor 104 includes a first wheel 105 having a rotor pinion 104c, a gear 105b and a pinion 105a, and a gear 106b and pinion 106a. And a third wheel 107 having a gear 107b. A pinion 104c provided at the center of the rotor 104 meshes with a gear 105b of the first wheel 105, and a pinion 105a of the first wheel 105 and a The gear 106b of the second wheel 106 meshes, the pinion 106a of the second wheel 106 meshes with the gear 107b of the third wheel 107, and the shaft of the third wheel 107 located at the end of the torque increasing gear train 110 has a rotation output shaft. 107a.

  In this embodiment, the number of gear trains is three, but the number of gear trains may be two or four depending on the relationship between the power of the two-pole step motor and the power required by the applied driven mechanism. It is also possible to change the number of gears by changing the rate of increase in torque between the gears, and to adapt to the driving speed and space of the driven mechanism.

  Two terminals respectively extending from the coils 102a and 102b are connected to connection points 108a, 108b, 180c and 108d provided on the stator 103, and the connection points 108b and 108c are connected in series. 108a and 108d are connected to the output terminal of the drive circuit 12 of the circuit section 20. The above circuit has been described in the first embodiment, and a description thereof will be omitted.

  It should be noted that the mechanism of the second embodiment is applicable not only as the mechanism of the first embodiment but also as a mechanism of the third embodiment described below. ,it is obvious.

  According to the second embodiment, a great effect can be obtained. That is, since the rotor uses two magnets, the holding force at the time of non-excitation is twice as large as that of one magnet, and the moment of inertia can be suppressed as compared with the case of using a magnet having a large volume in a plane. Drilling at the center is easier than using integrated magnets of the same volume and diameter. Since the rotor pinion is between the magnets, the burden on the tenon and the loss of friction during gear transmission are reduced.

  Although the description has been made on the assumption that the polar positions of the upper and lower magnets are the same, the rotational characteristics and the starting position can be adjusted by shifting the reverse.

  As compared with the case where a single stator having the same thickness is used, the configuration of the stator / coil core / stator allows the coil core to be in the center of the thickness, thereby enabling a reduction in thickness. Vortex loss can be reduced by separating the stator up and down.

  By arranging the gear train (gear mechanism) between two pairs of coils, the overall length of the motor gear device can be reduced.

  Next, a third embodiment according to the present invention will be described.

  FIG. 13 is a partial cross-sectional view of an optical lens driving device according to a third embodiment of the present invention. In this embodiment, an optical zoom lens mechanism is shown as a lens mechanism. FIG. 14 is a front view of the optical lens driving device of FIG. 13 as viewed from the optical lens opening side on the lower surface side of FIG.

  FIG. 15 is a plan view of a cam that is a conversion unit that converts rotation into linear movement.

  An optical zoom lens mechanism 300 as one of the lens mechanisms is schematically illustrated for explanation. The housing 301 is provided with a housing portion 301e which forms a space inside the housing, an opening 301a for taking in light, and an opening 301d facing the CCD 301 to face the housing 301e. The optical lenses 303 and 304 are held by holders 303a and 304a, respectively, and the holder 304a is fixed in a storage portion 301e of the housing 301 here. On the other hand, the holder 303a is slidably held up and down in FIG.

  The holder 303a is provided with an operating pin 303b that is slidably fitted into an elongated hole 301b provided on the side surface of the housing 301. The operating pin 303b extends out of the housing 301 and fits into the guide hole 310b of the cam 310.

  As shown in FIGS. 13, 15, and 17, the cam 310 has a cylindrical shaft bush 310a fixed to the center of rotation and extended on both sides longer than its thickness. As shown in FIG. 15, the guide hole 310b is a long hole whose distance R from the center of rotation changes. One end of the shaft bush 310a of the cam 310 is rotatably guided by a shaft hole 301c provided on a side surface of the housing 301, and the other end of the shaft bush 310a has an output shaft 208b protruding from the motor gear unit 320 and the output shaft 208b. The inner surface of the cylinder is tightly fitted.

  Accordingly, the rotation of the output shaft 208b rotates the cam 310, and the holder 303a supporting the optical lens 303 is guided by the operating pin 303b into the guide hole 310b of the cam 310 and the elongated hole 301b provided on the side surface of the housing 301. By sliding, the optical lens 303 can change the distance from the optical lens 304 or the CCD 305.

  Next, the motor gear unit 320 will be described with reference to FIGS. FIG. 16 is an explanatory diagram showing a combination of a plan view of the motor gear unit 320 and a block diagram of a related control / drive circuit. FIG. 17 is an elevational sectional view of the motor gear unit 320 taken along line DD in FIG.

  The motor gear unit 320 accommodates a two-pole step motor 209 and a reduction gear train 210 as a gear train for increasing torque in a space formed by the main plate 201 and the train wheel bearing 201a. Note that a part of the reduction gear train 210 is also held by the middle support 201c.

  Further, the circuit can be housed in the motor gear unit 320 or mounted on the motor gear unit 320, but an example outside the circuit is shown here. In particular, it is often desirable that the drive circuit 212 of the circuit section 220 be housed in the motor gear unit 320. Further, the circuit section 220, the oscillation circuit 213, the power supply 214, and the control signal input means 215 can also be mounted on the motor gear unit 320, or the motor gear unit 320 can be accommodated in a larger size. Obviously, these can be freely selected in design.

  The two-pole step motor 209 includes a rotor 204 having a rotor magnet 204 b made of a two-pole permanent magnet, a two-pole stator 203 having a rotor hole 203 a into which the rotor 204 enters, and being magnetically coupled to the rotor 204, and fixed to the stator 203. And these are arranged in a plane. The coil 202 is provided here as one coil. The rotor hole 203a of the stator 203 into which the rotor 204 enters is formed so that the stable position of the rotor 204 when the coil 202 is excited is different from the stable position of the rotor 204 when the coil 202 is not excited. are doing. Here, the rotor hole 203a has projections 203b and 203c (not shown here) at positions at an angle of about 45 degrees with the magnetic pole direction of the stator 203. In the present embodiment, the protrusions 203b and 203c are set at about 45 degrees with respect to the magnetic pole direction of the stator, but are preferably set at 25 to 75 degrees. Further, in the present embodiment, an example in which the protrusions 203b and 203c are provided as the shape of the rotor hole 203a of the stator 203 has been described, but the hole shape of the rotor hole 203a may be a stepped hole shape in which a semicircle is shifted. good. In this embodiment, a coil wire is wound around a coil core 202c to form a coil 202, which is fixed to a stator 203.

  A reduction gear train 210 that transmits the rotation of the rotor 204 and increases the rotation torque of the rotor 204 includes a kana 204a of the rotor, a first wheel 205 having a gear 205b and a kana 205a, and a second wheel 205 having a gear 206b and a kana 206a. 206, a third wheel 207 having a gear 207b and a pinion 207a, and a fourth wheel 208 having a gear 208a. The pinion 204a provided above the rotor 204 and the gear 205b of the first wheel 205 mesh with each other. The pinion 205a of the first wheel 205 meshes with the gear 206b of the second wheel 206, the pinion 206a of the second wheel 206 meshes with the gear 207b of the third wheel 207, and the pinion 207a of the third wheel 207 and the gear 208a of the fourth wheel 208. Are engaged with each other, and the shaft 208b of the fourth wheel 208 located at the end of the reduction gear train 210 projects below the main plate 201. To the output shaft 208b. The gear 208a of the fourth wheel 208 and the output shaft 208b are friction-fitted to form a slip mechanism 208c that slips when a predetermined torque or more is applied.

  In this embodiment, the number of gear trains is four, but it may be two or three depending on the relationship between the power of the two-pole step motor and the power required by the driven optical lens mechanism. Further, it is also possible to change the deceleration rate between the gears to increase or decrease the number of gears, and to adapt to the driving speed and space of the optical lens mechanism.

  The main plate 201 and the train wheel receiver 201a sandwich the stator 203, the rotor 204, and the reduction train wheel 210, and are sandwiched by screws or the like (not shown). The middle support 201c also supports one shaft of the first wheel 205 and the fourth wheel 208 to support the pinching. The third wheel 207 is held between the train wheel bridge 201a and the third wheel bridge 201e fixed to the main plate 201.

  Terminals of the coil 202 are connected to connection points 202a and 202b provided on the stator 203, and terminals from a circuit are also connected. This is conceptually shown in FIG. The circuit section 220 includes a drive circuit 212 that supplies a drive current to the coil 202 of the two-pole step motor 209, and a control circuit 211 that controls the drive circuit 212 and supplies a drive signal to the drive circuit 212. The control circuit 211 operates by receiving a signal from the oscillation circuit 213. It functions by receiving a signal from the control signal input means 215 for inputting an external input such as a button switch. In addition, there is a power supply 214 for supplying power to the circuit 220 and the two-pole step motor 209. The arrangement of these circuits has been described above.

  A control / driving circuit of the optical lens driving device according to the third embodiment will be further described with reference to the block diagram of FIG. In FIG. 18, in the present embodiment, a circuit section 220 includes a control circuit 211 and a drive circuit 212, and a back electromotive current detection circuit 217 for detecting an induced current generated in the coil due to the rotational movement of the rotor 204. Is provided. Further, a power supply voltage detection circuit 218 for detecting a change in the voltage of the power supply 214 is provided. Further, there is provided a limit switch 223 which detects the movement of the cam 310 or the operating pin 303b of the lens mechanism (optical zoom lens mechanism) 300 and sends a signal indicating the movement limit to the control circuit.

  The operating principle of the two-pole step motor 209 used in this embodiment is the same as that described in the first embodiment with reference to FIG.

  The specific driving method of the two-pole step motor 209 used in the third embodiment is also the same as that described in the first embodiment with reference to FIGS. Is omitted. The time ms on the horizontal axis in FIGS. 5 to 9 is also an example in the present embodiment.

  If a slip mechanism such as a gear having a shaft held by a spring portion is used between the rotor 4 and the conversion means (cam) 310 (in the above embodiment, the slip mechanism 208c is provided). ), Gears and the like can be prevented from being damaged by having a torque limit mechanism against an excessive load due to an external factor applied to the output shaft 208b.

  Further, if a reverse transmission prevention mechanism having a reverse rotation prevention tooth form is provided between the rotor 204 and the conversion means 310, for example, the gears or the rotor can be easily rotated by an external load such as an impact applied to the output shaft 208b. Can be prevented.

  According to the third embodiment, the torque-increasing gear train can be arranged in a plane without overlapping the two-pole step motor in cross section, so that it is possible to reduce the thickness. The power of the pole step motor can be increased, and the power can be increased by making the motor thinner.

  Further, by using a two-pole step motor, it is possible to reduce power consumption. In contrast to a conventional DC motor, a two-pole step motor has a constant holding force even when no current is flowing through the coil, and can reduce the power for holding a position to stop and hold at a fixed position. In addition, the two-pole step motor can be configured such that the stator and the coil are formed separately and two-dimensionally, and a wire having a wire diameter of about 10 to 40 μm is wound around 1,000 to 30,000 turns into a rod-shaped coil winding core, and several kilohms. Coil resistance can be prepared, and it can be combined with driving by chopper pulse, and current consumption can be suppressed to about several mA. Compared with current consumption of conventional DC motor (several tens mA) As a result, it is possible to prepare motor conditions advantageous for low power consumption driving.

  If the coil resistance of the two-pole step motor is set to 100 to 1000 Ω, more preferably 400 to 600 Ω, the current flowing into the coil is improved, and the startability of the rotor can be improved. it can.

  The motor gear unit used in this embodiment uses a step motor and a reduction gear train developed for a wristwatch as a motor gear unit for driving an optical lens. Made it possible. In this embodiment, one optical lens is moved. However, since a plurality of guide holes are provided in the cam to move the plurality of optical lenses, and the motor gear unit is thin and small, the periphery of the optical lens is reduced. It is possible to dispose a plurality of motor gear units to move a plurality of optical lenses. In the present embodiment, an optical zoom lens mechanism has been described as a lens mechanism, but the present invention can also be applied to an optical lens focus mechanism.

  The small driving device according to the present invention can be used as a driving device for aperture blades, shutters, lenses and the like of cameras and the like, and as a driving device for other portable small devices, toys and small models. Further, the optical lens driving device and the optical lens unit can be widely applied to an optical zoom lens mechanism, an optical lens focusing mechanism, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory plan view of a schematic configuration of a small-sized driving device for operating a driven mechanism according to a first embodiment of the present invention. Related control / driving circuits are also described as block diagrams for explanation. FIG. 2 is an elevational sectional view of a small driving device for operating the driven mechanism of FIG. 1. FIG. 2 is a block diagram of a circuit for controlling and driving a small drive device for operating the driven mechanism of FIG. 1. FIG. 4 is an operation principle diagram for explaining the operation of the two-pole step motor. (A) to (d) show positions where the rotor sequentially rotates. It is a drive waveform diagram which flows into the coil for normal 2-pole step motor drive. It is a drive waveform diagram which flows into the coil for two-pole step motor reverse rotation. FIG. 4 is a waveform diagram illustrating a waveform of a current flowing through the coil when the rotor is rotationally driven, an induced current generated in the coil due to a rotational motion of the rotor, and a timing of detection by a back electromotive current detection circuit. FIG. 4 is a waveform diagram showing a waveform of a current flowing through a coil, an induced current generated in the coil due to a rotational movement of a rotor, and detection timing by a back electromotive current detection circuit. FIG. 7 is a waveform diagram showing a current waveform flowing through the coil when the rotor is turned by an external factor, an induced current generated in the coil due to the rotational movement of the rotor, a timing of detection by the back electromotive current detection circuit, and a brake pulse by the drive circuit. . It is an explanatory plan view of a schematic configuration of a small-sized drive device for operating a driven mechanism as a second embodiment according to the present invention. Related control / drive circuits are omitted. FIG. 11 is an elevational sectional view of the small-sized driving device for operating the driven mechanism, taken along line EE in FIG. 10. FIG. 11 is an elevational sectional view of a small-sized driving device for operating the driven mechanism along the line FF in FIG. 10. FIG. 9 is a partial cross-sectional view of a driving device for an optical lens according to a third embodiment of the present invention, and in this embodiment, an optical zoom lens mechanism is shown as a lens mechanism. FIG. 14 is a front view of the optical lens driving device of FIG. 13 as viewed from the optical lens opening side on the lower surface side of FIG. 13. FIG. 14 is a plan view of a cam that is a conversion unit that converts rotation into linear movement used in the embodiment of FIG. 13. FIG. 14 is an explanatory diagram showing a combination of a plan view of a motor gear unit and a block diagram of a related control / drive circuit in the embodiment of FIG. 13. FIG. 17 is an elevational sectional view of the motor gear unit in the embodiment of FIG. 13 taken along the line DD in FIG. 16. FIG. 14 is a block diagram of a control / drive circuit for operating the optical lens drive device of FIG. 13.

Explanation of reference numerals

  Reference Signs List 1 housing, 1a lower housing, 1b upper housing, 2a, 2b coil, 3 stator, 3a rotor hole, 3b, 3c projection, 4 rotor, 5 first gear, 6 second gear, 7 third gear, 7a rotation output Shaft, 8a, 8b connection point, 9 two-pole step motor, 10 torque increasing gear train, 11 control circuit, 12 drive circuit, 13 oscillation circuit, 14 power supply, 15 control signal input means, 17 back electromotive current detection circuit, 18 power supply Voltage detection circuit, 20 circuit units, 21 driven body, 23 limit switch, 32 coil, 33 stator, 33a rotor hole, 33b, 33c protrusion, 34 rotor, 35 battery, 36 switch, 41 chopper pulse, 42 chopper pulse, 44 step pulse signal, 45 step pulse signal, 46 drive chopper pad 51, current waveform flowing through the coil, 52 induced current, 52a induced current, 53 detection timing pulse, 54 detection timing, 55 detection timing, 56 drive signal (brake pulse), 101a lower base, 101b upper base, 101c , 101d support, 102 coil, 102a first coil, 102b second coil, 102c, 102d coil core, 103 stator, 103a, 103b rotor hole, 103c, 103d protrusion, 104 rotor, 104a, 104b permanent magnet, 104c rotor kana , 105 first car, 105a kana, 105b gear, 106 second car, 106a kana, 106b gear, 107 third car, 107a rotation output shaft, 107b gear, 108a, 108b, 108c, 108d connection point, 109 2 Pole step motor, 110 torque increasing gear train, 113a first opposing portion, 113b second opposing portion, 113c, 113d connecting portion, 130a, 130b, 130c, 130d screw, 201 main plate, 201a train wheel bridge, 201c middle bridge, 201e Third vehicle receiving part, 202 coil, 202a, 202b connection point, 202c coil core, 203 stator, 203a rotor hole, 203b, 203c protrusion, 204 rotor, 204a kana, 204b rotor magnet, 205 first vehicle, 205a kana, 205b gear, 206 second wheel, 206a kana, 206b gear, 207 third wheel, 207a kana, 207b gear, 208 fourth wheel, 208a gear, 208b output shaft, 208c slip mechanism, 209 two-pole step motor, 210 reduction wheel Column 2, REFERENCE SIGNS LIST 1 control circuit, 212 drive circuit, 213 oscillation circuit, 214 power supply, 215 control signal input means, 217 back electromotive current detection circuit, 218 power supply voltage detection circuit, 220 circuit section, 223 limit switch, 300 optical zoom lens mechanism, 301 housing Body, 301a opening, 301b long hole, 301c shaft hole, 301d opening, 301e receiving section, 303 optical lens, 303a holder, 303b working pin, 304 optical lens, 304a holder, 305 CCD, 310 cam (converting means), 310a axis Bush, 310b Guide hole, 320 Motor gear unit.

Claims (31)

A two-pole step motor in which a rotor composed of two-pole permanent magnets, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are arranged in a plane; ,
A torque increasing gear train transmitting rotation of the rotor of the two-pole step motor;
A small-sized driving device for operating a driven mechanism, comprising: a rotary output shaft provided at an end of the torque increasing gear train.   The rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is opposed to one of the permanent magnets and has a first facing portion provided with a rotor hole into which the rotor enters, and the other of the permanent magnets A two-pole stepping motor having a second facing portion provided with a rotor hole in which the rotor enters so as to face the rotor, and the two coils are arranged in a plane and a torque increasing gear train is arranged therebetween. A small driving device for operating the driven mechanism according to claim 1.   3. The rotor hole of the stator according to claim 1, wherein the stable position of the rotor when the coil is excited is different from the stable position of the rotor when the coil is not excited. A small drive for operating the driven mechanism. A two-pole step motor in which a rotor composed of two-pole permanent magnets, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are arranged in a plane; ,
A torque increasing gear train transmitting rotation of the rotor of the two-pole step motor;
A rotation output shaft provided at the end of the torque increasing gear train, and a drive circuit for supplying a drive current to the coil of the two-pole step motor;
A control circuit that controls the drive circuit and supplies a drive signal to the drive circuit;
A small-sized driving device for operating a driven mechanism, comprising:   The rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is opposed to one of the permanent magnets and has a first facing portion provided with a rotor hole into which the rotor enters, and the other of the permanent magnets A two-pole stepping motor having a second facing portion provided with a rotor hole in which the rotor enters so as to face the rotor, and the two coils are arranged in a plane and a torque increasing gear train is arranged therebetween. A small driving device for operating the driven mechanism according to claim 4.   The said rotor hole of the said stator was formed so that the stable position of the rotor when the coil was excited and the stable position of the rotor when the coil was not excited may be different. A small drive for operating the driven mechanism.   The control circuit applies a reverse step pulse signal to the coil via the drive circuit after applying a step pulse signal having a width such that the rotor does not rotate one step, thereby rotating the rotor in the reverse direction. A small driving device for operating the driven mechanism according to claim 4 or 5.   6. A driving mechanism according to claim 4, further comprising a back electromotive current detection circuit for detecting an induced current generated in the coil due to the rotation of the rotor. Small drive.   The control circuit detects the rotational position of the rotor based on the induced current detected by the back electromotive current detection circuit, and determines the timing of the next drive signal according to the rotational position of the rotor. A small driving device for operating the driven mechanism according to claim 8.   6. The driven mechanism according to claim 1, wherein a slip mechanism is provided in the gear train between the rotation output shaft or the rotor and the rotation output shaft. Small drive for   The compact drive for operating the driven mechanism according to any one of claims 1, 2, 4 and 5, wherein a gear train between the rotor and the rotation output shaft is provided with a reverse transmission prevention mechanism. apparatus.   The driven mechanism according to any one of claims 1, 2, 4, and 5, further comprising a feed screw mechanism connected to the rotary output shaft and provided with a feed screw and a member that meshes with the feed screw. A small drive to operate.   When the back electromotive current detection circuit detects the induced current generated in the coil due to the rotational movement of the rotor when the rotor is not driven by the control circuit, the control circuit is configured to prevent the rotation of the rotor. A small driving device for operating a driven mechanism according to claim 4 or 5, wherein the driving device outputs a driving signal.   A power supply voltage detection circuit is provided for detecting a change in the power supply voltage accompanying a change in the power supply voltage or a change in the load torque. 6. A small driving device for operating a driven mechanism according to claim 4, wherein an output waveform of the driving signal is changed.   The operation of the driven mechanism according to claim 8, wherein the control circuit determines a form of the next drive signal based on the induced current detected by the back electromotive current detection circuit after outputting the drive signal. Small driving device for A two-pole step motor in which a rotor composed of two-pole permanent magnets, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are arranged in a plane; ,
A reduction gear train for reducing the rotation of the rotor of the two-pole step motor;
Conversion means for converting the rotation of the reduction gear train into linear movement;
An optical lens moved by the conversion means,
A lens mechanism for holding the optical lens movably in the center line direction,
A drive circuit for supplying a drive current to the coil of the two-pole step motor;
A control circuit that controls the drive circuit and supplies a drive signal to the drive circuit;
A driving device for an optical lens, comprising:   The rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is opposed to one of the permanent magnets and has a first facing portion provided with a rotor hole into which the rotor enters, and the other of the permanent magnets A two-pole stepping motor having a second facing portion provided with a rotor hole in which the rotor enters in opposition to the rotor, the two coils being arranged in a plane, and a reduction gear train being arranged therebetween. The optical lens driving device according to claim 16.   18. The rotor hole according to claim 16, wherein the rotor hole of the stator is formed such that a stable position of the rotor when the coil is excited is different from a stable position of the rotor when the coil is not excited. Driving device for optical lens.   18. The optical lens driving device according to claim 16, further comprising a slip mechanism between the rotor and the conversion unit.   18. The optical lens driving device according to claim 16, further comprising a reverse transmission preventing mechanism between the rotor and the conversion unit.   The control circuit applies a reverse step pulse signal to the coil via the drive circuit after applying a step pulse signal having a width such that the rotor does not rotate one step, thereby rotating the rotor in the reverse direction. 18. The optical lens driving device according to claim 16, wherein the driving is performed.   18. The optical lens driving device according to claim 16, further comprising a back electromotive current detection circuit for detecting an induced current generated in the coil due to the rotation of the rotor.   The control circuit detects the rotational position of the rotor based on the induced current detected by the back electromotive current detection circuit, and determines the timing of the next drive signal according to the rotational position of the rotor. An optical lens driving device according to claim 22.   23. The optical lens driving device according to claim 22, wherein the control circuit determines the form of the next drive signal based on the induced current detected by the back electromotive current detection circuit after outputting the drive signal. .   A power supply voltage detection circuit is provided for detecting a change in the power supply voltage accompanying a change in the power supply voltage or a change in the load torque. 18. The optical lens driving device according to claim 16, wherein an output waveform of the driving signal is changed.   When the back electromotive current detection circuit detects the induced current generated in the coil due to the rotational movement of the rotor when the rotor is not driven by the control circuit, the control circuit is configured to prevent the rotation of the rotor. 18. The optical lens driving device according to claim 16, wherein the driving device outputs a driving signal. A two-pole step motor in which a rotor composed of two-pole permanent magnets, a two-pole stator having a rotor hole into which the rotor is inserted and magnetically coupled to the rotor, and a coil fixed to the stator are arranged in a plane; ,
A reduction gear train for reducing the rotation of the rotor of the two-pole step motor;
Conversion means for converting the rotation of the reduction gear train into linear movement;
An optical lens moved by the conversion means,
A lens mechanism for holding the optical lens movably in the center line direction,
An optical lens unit comprising:   The rotor has two two-pole permanent magnets sandwiching a rotor pinion, and the stator is opposed to one of the permanent magnets and has a first facing portion provided with a rotor hole into which the rotor enters, and the other of the permanent magnets A two-pole stepping motor having a second facing portion provided with a rotor hole in which the rotor enters in opposition to the rotor, the two coils being arranged in a plane, and a reduction gear train being arranged therebetween. 28. The optical lens unit according to claim 27.   29. The rotor hole according to claim 27, wherein the rotor hole of the stator is formed such that a stable position of the rotor when the coil is excited is different from a stable position of the rotor when the coil is not excited. Optical lens unit.   29. The optical lens unit according to claim 27, further comprising a slip mechanism between the rotor and the conversion unit. 29. The optical lens unit according to claim 27, further comprising a reverse transmission prevention mechanism between the rotor and the conversion unit.

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