JP3807221B2 - Electronic device having electromagnetic coil and outputting data to outside, and control method of electronic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic device and a method for controlling the electronic device, and in particular, a stepping motor capable of rotating a multi-pole magnetized rotor in a stator having an electromagnetic coil, and transmitting data to the outside via the electromagnetic coil. And an electronic device including the transmission means.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an electronic timepiece having a motor coil, as a means for outputting data inside the timepiece to the outside of the timepiece without contact, a motor coil is used as a data transmission means and a reception coil as an external adjustment device is used as a reception means. Regardless of the direction of the magnetic field of the rotor, a minute pulse that does not rotate the rotor is output to the motor coil at a predetermined interval, and the magnetic field induced in the motor coil by the minute pulse is detected using an external adjustment device. Thus, a method has been adopted in which data inside the watch is output to the outside in the presence or absence of a magnetic field generated by a minute pulse.
[0003]
[Problems to be solved by the invention]
FIG. 2 and FIG. 3 show a waveform diagram of a current flowing through the motor coil and a schematic configuration diagram of the stepping motor when a rectangular wave is applied to the motor coil in each electronic timepiece. The magnetic field generated in the motor coil 303 by the data signal varies greatly depending on the polarity at the stationary position of the rotor 301 at the time of data transmission and the direction of the magnetic field generated in the motor coil. Therefore, there is a great difference in the level detected by the external adjustment device, it is difficult to set the sensitivity for detecting the magnetic field in the external adjustment device, and there is a possibility of erroneous detection due to noise or the like.
[0004]
The strength of the magnetic field generated in the motor coil 303 is the speed at which the magnetic saturation region A304 and the magnetic saturation region B310 in which the width between the rotor arrangement hole and the outer shape of the stator is the narrowest are saturated by the magnetic field in the stator of FIG. Depends on. When the magnetic saturation region A304 and the magnetic saturation region B310 in FIG. 3 are saturated by a magnetic field, the magnetic permeability of the stator 302 decreases and the inductance component of the motor coil 303 decreases, so that the current flowing through the motor coil 303 increases sharply. Therefore, since the magnetic field generated in the motor coil 303 depends on the temporal change of the current flowing in the motor coil 303, a strong magnetic field that can be easily detected by the external adjustment device can be obtained. That is, while the magnetic saturation region A304 and the magnetic saturation region B310 are not saturated, the time variation of the current is small, so that the magnetic field generated by the motor coil 303 is weak and it is difficult to detect the magnetic field with the external adjustment device.
[0005]
When the N pole of the rotor 301 is directed to the right as shown in FIG. 3, a magnetic field is generated from the N pole of the rotor to the S pole. Therefore, the magnetic saturation region A304 and the magnetic saturation region B310 of the stator are magnetic fields from right to left. Occurs. When a minute data signal 201 is applied from the O1 terminal 306 of the motor coil 303 in this state, the magnetic field from the right to the left is applied to the magnetic saturation region A304 and the magnetic saturation region B310 according to the ampere right-hand screw law. Occurs. Here, in the magnetic saturation region A304 and the magnetic saturation region B310, both the magnetic field generated by the rotor 301 and the magnetic field generated by the motor coil 303 flow from right to left, so that the magnetic saturation region A304 and the magnetic saturation region B310 are saturated immediately. Therefore, the inductance of the motor coil 303 rapidly decreases in a short time, and the current 202 flowing through the motor coil 303 changes abruptly as shown in the repulsive pulse current waveform of FIG. 2, so that the magnetic field generated in the motor coil 303 becomes stronger. A pulse applied to the motor coil so that a strong magnetic field is generated in the motor coil as described above is called a repulsion pulse.
[0006]
When the rotor 301 applies a minute data signal 201 from the O2 terminal 305 in the state of FIG. 3, the rotor 301 applies a magnetic field from right to left to the magnetic saturation region A304 and the magnetic saturation region B310 as described above. However, when a minute data signal is applied from the O2 terminal 305, a magnetic field from the left to the right is applied to the magnetic saturation region A304 and the magnetic saturation region B310, so that the magnetic field generated in the motor coil 303 cancels the magnetic field of the rotor 301 and further magnetic saturation region. It is necessary to saturate A304 and the magnetic saturation region B310. Therefore, when a current is supplied from the O2 terminal 305, it takes a longer time for the magnetic saturation region A304 and the magnetic saturation region B310 to be saturated than when a current is supplied from the O1 terminal 306. As shown in the attraction pulse current waveform, the magnetic saturation region A304 and the magnetic saturation region B310 gradually increase until saturation, and the magnetic saturation region A304 and the magnetic saturation region B310 change suddenly and suddenly. For this reason, even if a data signal having the same width is transmitted at the same voltage, the magnetic field generated in the motor coil 303 is weaker than the repulsive pulse. The pulses applied to the motor coil as described above are called suction pulses.
[0007]
Therefore, there is a problem that it is difficult to set the detection level for detecting the magnetic field by the external adjustment device because the intensity of the generated magnetic field is different between the repulsion pulse and the attraction pulse.
[0008]
In addition, even if a magnetic field is generated in the motor coil 303 due to the suction pulse, it is necessary to widen the pulse width of the data signal in order to make it possible to detect the magnetic field with the external adjustment device, resulting in an increase in current consumption. there were.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an invention according to claim 1 is an electromagnetic transducer comprising a rotor magnetized to two or more poles, a stator surrounding an outer periphery of the rotor, and an electromagnetic coil coupled to the stator. And transmitting means for transmitting data based on a magnetic field to the outside via the electromagnetic coil, when transmitting data based on the magnetic field to the outside via the electromagnetic coil, the rotor at a stationary position of the rotor Transmission means for transmitting a data signal to the electromagnetic coil in a direction in which the magnetic field generated in the electromagnetic coil increases depending on the direction of the magnetic field generated in the electromagnetic coil.
[0010]
According to a second aspect of the present invention, in the electronic device according to the first aspect, the polarity recognition means for recognizing the direction of the magnetic field generated from the rotor at the stationary position of the rotor, and the electromagnetic coil is determined by the recognition result of the recognition means. Transmission means for transmitting a data signal to the electromagnetic coil so that a current flows in the direction in which the current flows.
[0011]
According to a third aspect of the present invention, there is provided the electronic device according to the first aspect, wherein the polarity determining means for mechanically or electrically determining the direction of the magnetic field generated from the rotor at the stationary position of the rotor by the external operation; The electromagnetic coil includes a transmission means for transmitting a data signal to the electromagnetic coil so that a current flows in a direction determined by the polarity determination means.
[0012]
According to a fourth aspect of the present invention, in the electronic device according to any one of the first to third aspects, the electromagnetic coil is a motor coil, and the electromagnetic converter is a stepping motor.
[0013]
According to a fifth aspect of the present invention, in the electronic device according to the second or fourth aspect, as the polarity recognition means, a polarity storage means for storing in which direction the motor drive pulse has been previously output is stored in the electromagnetic coil. And transmitting means for transmitting a data signal to the electromagnetic coil such that a current flows through the electromagnetic coil in a direction determined by the storage means.
[0014]
According to a sixth aspect of the present invention, in the electronic device according to the third or fourth aspect, as the polarity determination means, at least one motor drive signal is applied to the electromagnetic coil from a predetermined direction, so that the rotor Control means for controlling the direction of the magnetic field generated from the rotor at a stationary position to be constant, and transmission means for transmitting a data signal to the electromagnetic coil so that a current flows through the electromagnetic coil in a predetermined direction. It is characterized by that.
[0015]
According to a seventh aspect of the present invention, in the electronic device according to the fourth aspect, the data signal is output during a period in which the motor drive signal that is normally intermittently driven is not output, and the direction of the motor drive signal output immediately before And a transmission means for transmitting a data signal so that a current flows through the electromagnetic coil in the direction determined in (1).
[0016]
According to an eighth aspect of the present invention, in the electronic device according to the first to seventh aspects, the electronic device is an analog electronic timepiece.
[0017]
According to a ninth aspect of the present invention, there is provided an electromagnetic transducer comprising a rotor magnetized to two or more poles, a stator surrounding the outer periphery of the rotor, an electromagnetic coil coupled to the stator, and the electromagnetic coil. And a transmission unit that transmits data to the outside, when transmitting data by a magnetic field to the outside via the electromagnetic coil, depending on the direction of the magnetic field generated in the rotor at a stationary position of the rotor A data signal is transmitted to the electromagnetic coil so that a current flows through the electromagnetic coil in a predetermined direction.
[0018]
According to a tenth aspect of the present invention, in the method for controlling an electronic device according to the ninth aspect, polarity recognition means for recognizing a direction of a magnetic field generated from the rotor at a stationary position of the rotor, and recognition of the recognition means for the electromagnetic coil Transmitting means for transmitting a data signal to the electromagnetic coil so that a current flows in a direction determined by the result is provided.
[0019]
The eleventh aspect of the invention is the electronic device control method according to the ninth aspect, wherein the direction of the magnetic field generated from the rotor at the stationary position of the rotor is determined mechanically or electrically by an external operation by the polarity determination means. A data signal is transmitted to the electromagnetic coil so that a current flows through the electromagnetic coil in a direction determined by the polarity determining means.
[0020]
According to a twelfth aspect of the present invention, in the electronic device control method according to the tenth aspect, in which direction the motor drive pulse was previously output to the electromagnetic coil by the polarity storage means as the polarity recognition means. Storing, and transmitting a data signal to the electromagnetic coil such that a current flows through the electromagnetic coil in a direction determined by the storage means.
[0021]
According to a thirteenth aspect of the present invention, in the electronic device control method according to the eleventh aspect, at least one motor drive signal is applied to the electromagnetic coil from a predetermined direction by the control means as the polarity determination means. The control means for controlling the direction of the magnetic field generated from the rotor at a stationary position of the rotor to be constant, and transmits a data signal to the electromagnetic coil so that a current flows through the electromagnetic coil in a predetermined direction. It is characterized by that.
[0022]
According to a fourteenth aspect of the present invention, in the electronic device control method according to the ninth aspect, the data signal is output during a period in which the motor drive signal that is normally intermittently driven is not output, and the motor drive that is output immediately before is output. A data signal is transmitted so that a current flows through the electromagnetic coil in a direction determined by a signal direction.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0024]
An analog electronic timepiece will be described as an example. However, the present invention is not limited to this, and the present invention can be applied to any electronic device capable of data communication.
[0025]
(1.1) Outline Configuration of Communication System FIG. 1 is a block diagram showing the outline configuration of a data transmission system according to this embodiment.
[0026]
In this transmission system 100, a motor coil 303 that shifts from a normal mode to an inspection mode and outputs data STR in an electronic timepiece according to an operation of an external operation member 105 such as a crown or a button or a control signal from an external adjustment device 104. The analog electronic timepiece 103 including the external operation member 105 described above and the external adjustment device 104 that receives the data STR output from the motor coil 303 via the reception coil 102 are configured.
[0027]
Here, the normal mode refers to an operation state in which the analog electronic timepiece 103 displays the current time, and the inspection mode refers to an operation state for performing an inspection of the analog electronic timepiece 103.
[0028]
(1.1.1) Outline Configuration of Analog Electronic Timepiece FIG. 4 is a block diagram of the outline configuration of an analog electronic timepiece.
[0029]
The analog electronic timepiece 103 includes an oscillation circuit 401 that generates a reference pulse signal having a predetermined reference frequency from a reference oscillation signal of a crystal resonator, and a frequency dividing circuit that divides the reference pulse signal to generate various pulse signals having different frequencies. 402, a control circuit 406 configured by a CPU, a memory, and the like that control the operation of the entire analog electronic timepiece 103 based on various pulse signals output from the frequency dividing circuit 402 and data stored in the data storage circuit 408, and a control circuit A drive pulse generating circuit 403 that generates a data signal of data stored in the data storage circuit 408 when a drive pulse and data transmission state for driving the stepping motor every 1 second according to the control of 406, and a drive pulse and a data signal A polarity storage circuit 404 for storing the direction in which the drive current should flow through the motor coil 303 based on The polarity memory circuit 404 stores a drive circuit 405 that allows current to flow in the direction determined by the motor coil 303, a detection circuit 407 that detects data received via the motor coil using a comparator, and the like. And a data storage circuit 408.
[0030]
(1.1.2) Outline Configuration of External Adjustment Device FIG. 5 is a block diagram of the outline configuration of the external adjustment device.
[0031]
The external adjustment device 104 includes an oscillation circuit 501 that generates a reference pulse signal having a predetermined reference frequency from a reference oscillation signal of a crystal resonator, and a frequency dividing circuit that divides the reference pulse signal to generate various pulse signals having different frequencies. 502, a control circuit 503 for generating a reception detection timing and a timing for performing serial / parallel conversion of the detection signal based on various pulse signals output from the frequency dividing circuit, and a control circuit 503 that is fair in the memory, etc. A receiving coil 102 that is a magnetic field receiving means, a detection circuit 506 that detects a magnetic field received by the receiving coil 102, and a synchronization that transmits a synchronization signal to the frequency dividing circuit 502 and the control circuit 503 when a signal is detected by the detection circuit. A circuit 505, a serial / parallel conversion circuit 509 for serial / parallel conversion of data detected by the detection circuit, and a conversion And a data storage circuit 508 for storing data, and a data display circuit 507 for displaying the stored data.
[0032]
(1.1.3) Configuration of Stepping Motor FIG. 3 is a schematic configuration diagram of the stepping motor. A motor coil 303, a stator 302 excited by the motor coil, and a rotor 301 rotated by a magnetic field excited inside the stator are provided. In addition, this rotor is comprised by PM type (permanent magnet rotation type) comprised by the disk-shaped dipole permanent magnet.
[0033]
The stator 302 is provided with magnetic saturation portions 304 and 310 so that different magnetic poles are generated in the respective phases (poles) 308 and 309 around the rotor 301 depending on the magnetic force generated by the motor coil 303. Further, in order to define the rotation direction of the rotor 301, an inner notch 307 is provided at an appropriate position on the inner circumference of the stator so as to generate cogging torque so that the rotor 301 stops at an appropriate position. Yes.
[0034]
(1.2) Operation of Example Next, data transmission between the analog electronic timepiece and the external adjustment device will be described with reference to the flowchart 600 and the timing chart 700 of FIGS. The following steps are advanced by the control circuit 406 of the analog electronic timepiece and the control circuit 503 of the external adjustment device.
[0035]
Here, a case will be described in which the EEPROM data is output to the outside in order to confirm the EEPROM data, which is the rate adjustment data of the timepiece built in the analog electronic timepiece.
[0036]
When the operator performs the specified complex operation (S1) of the crown, the signal shown in “Crew operation” in FIG. 7 is output, and the control circuit 406 changes the operation mode of the analog electronic timepiece from the normal mode to the data transmission mode. Transition (Y of S1). Here, the data transmission mode signal of FIG. 7 generated by the control circuit 406 becomes Hi. If S1 is not performed, normal operation is continued (N in S1). When the data transmission mode signal becomes Hi and shifts from the normal hand movement mode to the data transmission mode, the normal hand movement is stopped (S2), and the polarity determination pulse PK is applied from the O2 terminal 305 (S3). If a drive pulse is output from the O1 terminal 306 immediately before stopping the hand movement, the rotor 301 is rotated by the polarity determination pulse PK from the O2 terminal 305 after the hand movement is stopped, and the repulsive pulse output direction of the rotor 301 at the static stable position. However, it becomes the O1 terminal 306 as shown in FIG. 7 (S4). If a drive pulse is output from the O2 terminal 305 immediately before stopping the hand movement, the rotor 301 does not rotate with the polarity determination pulse PK from the O2 terminal 305 after stopping the hand movement, and the repulsive pulse output direction at the static stable position of the rotor 301 Becomes the O1 terminal 306. Here, when the polarity pulse PK is detected by the comparator constituting the detection circuit 506 for detecting the magnetic field of the external adjustment device 104, the synchronization circuit 505 of the external adjustment device 104 synchronizes the external adjustment device 104 and the analog electronic timepiece 103, The detection comparator of the external adjustment device stops detection for a certain period. On the analog electronic timepiece side, based on the data in the EEPROM which is the data storage circuit 408, the drive pulse generation circuit 403 outputs a signal if the data signal PD is data 1 at equal intervals through the control circuit 406, and outputs no signal if 0. (S5). The generated data signal PD is transmitted from the O1 terminal 306 to the motor coil 303 by the drive circuit 405, so that the data signal PD always outputs a repulsion pulse. At this time, the detection comparator of the external adjustment device reads the data from the analog electronic timepiece by turning on the comparator in accordance with the output timing of the data signal from the analog electronic timepiece as shown in FIG. The analog electronic timepiece side outputs the demagnetizing pulse PE from the O2 terminal 305 after the data output is completed, and demagnetizes the motor coil (S6).
[0037]
(1-2) Effects of Embodiment As described above, according to the present embodiment, when data is transmitted from the watch to the external adjustment device, the watch-side data signal PD is always output as a repulsion pulse. The variation in the strength of the magnetic field generated in the motor coil by the data signal PD is reduced, and detection by an external adjustment device is facilitated. Further, since the repulsion pulse is always output, the pulse width of the data signal PD can be shortened. Therefore, current consumption during data transmission can be reduced. Further, by outputting the polarity determination pulse PK, synchronization between the timepiece and the external adjustment device can be easily achieved, and smooth data transmission is possible.
[0038]
(2) Modification (2.1) First Modification In the above-described embodiment, the polarity determination pulse PK is output from O2 when the reception mode is entered as the polarity determination means, but the present invention is not limited to this, and the timepiece The polarity storage circuit 404 in the memory stores whether the motor pulse output direction before the data transmission mode is output from O1 or O2, and outputs the motor pulse output direction before the reception mode is input. May output the data signal PD in the direction in which the repulsion pulse is output in the opposite direction.
[0039]
(2.2) Second Modification In the above-described embodiment, the motor drive pulse output is prohibited during the data signal output period. However, the present invention is not limited to this, and the motor drive is not stopped without stopping the motor drive pulse output. The data signal PD may be output in the direction in which the repulsion pulse is output between the pulses.
[0040]
(2.3) Third Modification In the above-described embodiment, the case where the data signal STR is transmitted via the driving motor coil of the analog electronic timepiece has been described, but the present invention is for power generation used by magnetic field power generation. It is possible to transmit via the power generation coil.
[0041]
(2.4) Fourth Modification In the embodiment described above, the case where the present invention is applied to an analog electronic timepiece has been described. However, the present invention is not limited to this, and a stator with a motor coil is provided as a multipolar rotor. The present invention can be widely applied to electronic devices that include a stepping motor that can be driven to rotate inside and that can transmit data by a magnetic field to the outside via a motor coil.
For example, it can be applied to a mobile phone, a small information device, and the like.
[0042]
【The invention's effect】
As described above, according to the present invention, since the clock-side data signal PD is always output as a repulsive pulse, variation in the strength of the magnetic field generated in the motor coil by the data signal PD is reduced, and detection by the external adjustment device Becomes easier. Further, since the repulsion pulse is always output, the pulse width of the data signal PD can be shortened. Therefore, current consumption during data transmission can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration block diagram of a data transmission system according to an embodiment of the present invention.
FIG. 2 is a waveform diagram of current flowing in a motor coil in the data transmission system.
FIG. 3 is a schematic configuration diagram of a stepping motor in the data transmission system.
FIG. 4 is a schematic block diagram of an analog electronic timepiece in the data transmission system.
FIG. 5 is a block diagram showing a schematic configuration of an external adjustment device in the data transmission system.
FIG. 6 is a flowchart for explaining the transmission method of the data transmission system. FIG. 7 is a timing chart for explaining the transmission method of the data transmission system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Data transmission system 102 ... Transmission coil 103 ... Analog electronic timepiece 104 ... External adjustment device 105 ... External operation member 200・ ・ ・ ・ ・ ・ Motor coil current waveform 201 ・ ・ ・ ・ ・ ・ Data signal 202 ・ ・ ・ ・ ・ ・ Current 203 that flows in motor coil when repulsion pulse is applied ・ ・ ・ ・ ・ ・ Motor coil when suction pulse is applied Flowing current 300 ... Stepping motor 301 ... Rotor 302 ... Stator 303 ... Motor coil 304 ... Magnetic saturation region A
305 ... O2 terminal 306 ... O1 terminal 307 ... Inner notch 308 ... Phase (pole)
309 ... ・ Phase (Pole)
310... Magnetic saturation region B
401... Oscillation circuit 402... Frequency dividing circuit 403... Drive pulse generation circuit 404.・ ・ ・ ・ ・ ・ Control circuit 407 ・ ・ ・ ・ ・ ・ Detection circuit 408 ・ ・ ・ ・ ・ ・ Data storage circuit 501 ・ ・ ・ ・ ・ ・ Oscillation circuit 502 ・ ・ ・ ・ ・ ・ Frequency circuit 503 ... Control circuit 505 ... Synchronous circuit 506 ... Detection circuit 507 ... Data display circuit 508 ... Data storage circuit 509 ... Serial / parallel conversion circuit

Claims (14)

A rotor magnetized in two or more poles, a stator enclosing the outer periphery of the rotor, an electromagnetic converter composed of an electromagnetic coil coupled to the stator, and data by a magnetic field are transmitted to the outside through the electromagnetic coil In the electronic device comprising the transmission means, when transmitting data by the magnetic field to the outside through the electromagnetic coil, the magnetic field generated in the electromagnetic coil is large due to the direction of the magnetic field generated in the rotor at the stationary position of the rotor. An electronic apparatus comprising: a transmission unit that transmits a data signal to the electromagnetic coil in a direction. 2. The electronic device according to claim 1, wherein a polarity recognizing unit for recognizing a direction of a magnetic field generated from the rotor at a stationary position of the rotor, and a current flows through the electromagnetic coil in a direction determined by a recognition result of the recognizing unit. An electronic apparatus comprising: a transmission means for transmitting a data signal to the electromagnetic coil. 2. The electronic device according to claim 1, wherein the direction of a magnetic field generated from the rotor at a stationary position of the rotor is determined mechanically or electrically by an external operation, and the electromagnetic coil is provided with the polarity determining means. An electronic apparatus comprising: a transmission unit configured to transmit a data signal to the electromagnetic coil so that a current flows in a determined direction. 4. The electronic apparatus according to claim 1, wherein the electromagnetic coil is a motor coil, and the electromagnetic converter is a stepping motor. 5. The electronic device according to claim 2, wherein the polarity recognition means includes polarity storage means for storing in which direction the motor drive pulse was previously output to the electromagnetic coil, and the storage is stored in the electromagnetic coil. An electronic apparatus comprising: a transmission unit that transmits a data signal to the electromagnetic coil so that a current flows in a direction determined by the unit. 5. The electronic device according to claim 3, wherein, as the polarity determination unit, a magnetic field generated from the rotor at a stationary position of the rotor by applying at least one motor drive signal to the electromagnetic coil from a predetermined direction. An electronic apparatus comprising: a control unit that controls the direction of the electromagnetic coil to be constant; and a transmission unit that transmits a data signal to the electromagnetic coil so that a current flows through the electromagnetic coil in a predetermined direction. 5. The electronic device according to claim 4, wherein a data signal is output during a period in which a motor drive signal that is normally intermittently driven is not output, and the electromagnetic wave is oriented in a direction determined by the direction of the motor drive signal output immediately before. An electronic apparatus comprising a transmission means for transmitting a data signal so that a current flows through a coil. 8. The electronic electronic timepiece according to claim 1, wherein the electronic device is an analog electronic timepiece. A rotor magnetized in two or more poles, a stator surrounding the outer periphery of the rotor, an electromagnetic converter composed of an electromagnetic coil coupled to the stator, and a transmission means for transmitting data to the outside via the electromagnetic coil In a method for controlling an electronic device comprising: a magnetic field that is transmitted to the outside via the electromagnetic coil, a predetermined direction is applied to the electromagnetic coil according to a direction of the magnetic field generated in the rotor at a stationary position of the rotor. A data signal is transmitted to the electromagnetic coil so that a current flows through the electronic coil. 10. The electronic device according to claim 9, wherein a polarity recognizing unit for recognizing a direction of a magnetic field generated from the rotor at a stationary position of the rotor, and a current flows through the electromagnetic coil in a direction determined by a recognition result of the recognizing unit. And a transmission means for transmitting a data signal to the electromagnetic coil. 10. The method of controlling an electronic device according to claim 9, wherein a polarity at a stationary position of a rotor attached to the electromagnetic coil is determined by an external operation by a polarity determination unit, and a data signal is transmitted in a direction determined by the polarity determination unit. A method for controlling an electronic device, comprising: transmitting to an electromagnetic coil. 11. The method of controlling an electronic device according to claim 10, wherein a polarity storage means as the polarity recognition means stores in which direction the motor drive pulse was previously output in the electromagnetic coil, and the electromagnetic coil stores the direction. A method for controlling an electronic device, comprising: transmitting a data signal to the electromagnetic coil such that a current flows in a direction determined by a storage unit. 12. The method of controlling an electronic device according to claim 11, wherein at least one motor drive signal is applied to the electromagnetic coil from a predetermined direction by the control unit as the polarity determination unit, so that the rotor is in a stationary position. An electronic apparatus comprising: a control unit configured to control a direction of a magnetic field generated from the rotor to be constant, and transmitting a data signal to the electromagnetic coil so that a current flows in a predetermined direction through the electromagnetic coil. Control method. 10. The method for controlling an electronic device according to claim 9, wherein a data signal is output during a period in which the motor drive signal that is normally intermittently driven is not output, and the direction is determined by the direction of the motor drive signal output immediately before A data signal is transmitted so that a current flows through the electromagnetic coil.

Images