JP2009089048A - Portable electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide portable electronic equipment capable of detecting an oblique angle with disturbance eliminated therefrom in real time. <P>SOLUTION: A portable telephone unit 1 has: a vibration motor 48 for generating vibration; an acceleration sensor 45 for detecting acceleration data of three axes crossing mutually in a first period; a first calculation means for acquiring the acceleration data of three axes detected by the acceleration sensor 45 to calculate an acceleration value, namely the size of an acceleration vector; and a replacement means for replacing the detected acceleration data of three axes with the last acceleration data in each first period, when a difference between the acceleration value calculated by the first calculation means and that in a stationary state is equal to or more than a prescribed value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable electronic device incorporating an acceleration sensor.

  2. Description of the Related Art Conventionally, a portable electronic device such as a mobile phone has a built-in tilt sensor that measures a tilt angle of a main body and performs a control according to the tilt. In such a portable electronic device, by detecting the tilt of the main body with a tilt sensor, this can be used as input to various applications, control programs, etc., and various controls and effects such as light emission control and display image change can be performed. Is possible.

  For example, Patent Document 1 proposes a mobile phone that turns on a backlight when a state that is not a predetermined reference angle is changed to a reference angle.

  By the way, portable electronic devices often have a built-in vibration motor, and often notify the user of an incoming call or the arrival of a set time by vibration, or perform an effect together with music or sound effects.

  Here, when such vibration of the portable electronic device occurs during the measurement of the inclination angle, the inclination sensor detects this vibration as a change in the inclination angle. FIG. 1 is a diagram illustrating a change in a measured value of an inclination angle when a vibration motor of a stationary mobile phone is operated. Thus, the measurement value changes greatly due to the occurrence of vibration. As a result, the original inclination of the mobile electronic device cannot be detected correctly, which impedes production and control.

Therefore, proposals have been made to prevent such malfunction caused by vibration. For example, in Patent Document 2, as a preparation for identifying an operation pattern based on the acceleration of a mobile electronic device, it is confirmed whether or not a stationary state in which the acceleration of the mobile electronic device is equal to or less than a set threshold value has continued for a certain time. It has been shown that after a stationary state lasts for a certain time, an operation pattern is identified.
JP 2006-14056 A JP 2006-139537 A

  However, according to the method of Patent Document 2, for example, when acceleration exceeding a threshold value is generated due to vibration, it is necessary to wait for the vibration to stop in order to identify the operation pattern of the portable electronic device. In other words, in situations where acceleration other than the predetermined motion pattern is applied, such as vibration of the main body or acceleration from outside, motion pattern identification processing cannot be performed, so it operates in real time without waiting until it stops. The pattern cannot be identified.

  As described above, it has been difficult to detect the tilt of the main body, the operation pattern, and the like in real time without being affected by the disturbance for the production and control of the portable electronic device.

  Accordingly, an object of the present invention is to provide a portable electronic device that can detect an inclination angle from which disturbance has been removed in real time.

  A portable electronic device according to the present invention is a portable electronic device having a device that generates vibrations and an acceleration sensor that detects acceleration data of three axes orthogonal to each other in a first period, and is detected by the acceleration sensor. The first calculation means for acquiring the acceleration data of the axis and calculating the acceleration value which is the magnitude of the acceleration vector, and the difference between the acceleration value calculated by the first calculation means and the acceleration value in the stationary state is And replacing means for replacing the detected three-axis acceleration data with the previous acceleration data in the first period when the number of acceleration data exceeds a predetermined value.

  The replacement means is a value indicating the square root of the sum of squares of the acceleration data for each of the three axes and one gravitational acceleration as a difference between the acceleration value calculated by the first calculation means and the acceleration value in a stationary state. It is preferable to obtain from the difference.

  In addition, the portable electronic device according to the present invention further includes detection means for detecting occurrence of an event accompanied by driving of the device, and the replacement means detects the occurrence of the event when the detection means detects the occurrence of the event. It is preferable to make the means function.

  In addition, the portable electronic device according to the present invention calculates a tilt angle for each of the three axes based on acceleration data detected by the acceleration sensor in a second period longer than the first period. It is preferable to further comprise means and control means for controlling the effect according to the tilt angle calculated by the second calculation means.

  In addition, the portable electronic device according to the present invention further includes a communication unit that detects a call signal for the device itself, and the device is a vibrator, and a notification when the call signal is detected by detecting the call signal by the communication unit. When the vibration notification by the vibrator is designated as a means, the replacement means functions when the call signal is detected, and when the vibrator is not designated as the notification means, the call signal is detected. However, it is preferable not to make the replacement means function.

  In addition, the portable electronic device according to the present invention calculates a tilt angle for each of the three axes based on acceleration data detected by the acceleration sensor in a second period longer than the first period. And a control means for controlling an effect according to the tilt angle calculated by the second calculation means, wherein the control means is configured to detect a call signal by the communication means and perform a call notification. It is preferable to control the effect for the notification.

  According to the portable electronic device of the present invention, it is possible to detect the tilt angle from which the disturbance is removed in real time.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 2 is an external perspective view of a mobile phone 1 which is an example of the mobile electronic device according to the present invention. Note that FIG. 2 shows a so-called foldable mobile phone, but the mobile phone according to the present invention is not limited to this. For example, a sliding type in which one casing is slid in one direction from a state in which both casings are overlapped, or a rotary type in which one casing is rotated around an axis along the overlapping direction ( Turn type), or a type (straight type) in which the operation unit and the display unit are arranged in one housing and does not have a connecting unit.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 includes an operation unit 11 and a microphone 12 into which a voice uttered by a user of the mobile phone 1 is input on the surface unit 10. The operation unit 11 includes a function setting operation button 13 for activating various functions such as various setting functions, a telephone book function, and a mail function, and an input operation button 14 for inputting numbers of telephone numbers, mail characters, and the like. , And a determination operation button 15 for performing determination and scrolling in various operations.

  The display unit side body 3 includes an LCD (Liquid Crystal Display) display unit 21 for displaying various types of information on the surface unit 20 and a speaker 22 for outputting the voice of the other party of the call. Has been.

  Further, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected via a hinge mechanism 4. In addition, the mobile phone 1 relatively rotates the operation unit side body 2 and the display unit side body 3 which are connected via the hinge mechanism 4, so that the operation unit side body 2 and the display unit side body 3 are rotated. The body 3 can be in an open state (open state), or the operation unit side body 2 and the display unit side body 3 can be folded (folded state).

  FIG. 3 is a block diagram showing functions of the mobile phone 1. The mobile phone 1 includes an operation unit 11, a microphone 12, a main antenna 40, an RF circuit unit 41, an LCD control unit 42, an audio processing unit 43, a memory 44, an acceleration sensor 45, and a light emitting unit 46. The power control circuit unit 47, the vibration motor 48, the CPU 49, and the rechargeable battery 50 are provided in the operation unit side body 2, and the LCD display unit 21, the speaker 22, and the driver IC 23 are included in the display unit side body. 3 is provided.

  The main antenna 40 communicates with an external device in a predetermined use frequency band (for example, 800 MHz). In the present embodiment, the predetermined use frequency band is 800 MHz, but other frequency bands may be used. Further, the main antenna 40 may have a so-called dual-band compatible configuration that can support other use frequency bands (for example, 2 GHz) in addition to a predetermined use frequency band.

  The RF circuit unit 41 demodulates the signal received by the main antenna 40, supplies the processed signal to the CPU 49, modulates the signal supplied from the CPU 49, and performs an external device (via the main antenna 40). To the base station). On the other hand, the CPU 49 is notified of the strength of the signal received by the main antenna 40.

  The LCD control unit 42 performs predetermined image processing according to the control of the CPU 49 and outputs the processed image data to the driver IC 23. The driver IC 23 stores the image data supplied from the LCD control unit 42 in the frame memory and outputs it to the LCD display unit 21 at a predetermined timing.

  The audio processing unit 43 performs predetermined audio processing on the signal supplied from the RF circuit unit 41 under the control of the CPU 49 and outputs the processed signal to the speaker 22. The speaker 22 outputs the signal supplied from the sound processing unit 43 to the outside.

  The audio processing unit 43 processes the signal input from the microphone 12 according to the control of the CPU 49 and outputs the processed signal to the RF circuit unit 41. The RF circuit unit 41 performs a predetermined process on the signal supplied from the sound processing unit 43 and outputs the processed signal to the main antenna 40.

  The memory 44 includes, for example, a working memory and is used for arithmetic processing by the CPU 49. Specifically, acceleration data detected by an acceleration sensor 45 (to be described later), past saved data, a threshold value for determining the occurrence of a disturbance, and the like can be stored. Note that the memory 44 may also serve as a removable external memory.

  The acceleration sensor 45 detects the acceleration given to the mobile phone 1 and outputs the detection result to the CPU 49.

  The acceleration sensor 45 is a three-axis (three-dimensional) type that detects acceleration in the X-axis direction, the Y-axis direction, and the Z-axis direction, and is based on an externally applied force (F) and mass (m). (A) is measured (acceleration (a) = force (F) / mass (m)).

  Further, the acceleration sensor 45 measures the force applied to a predetermined mass by a piezoelectric element to obtain the acceleration for each axis, converts it into numerical data, and buffers it. Then, the CPU 49 reads the acceleration data periodically buffered. The acceleration sensor 45 is not limited to a piezoelectric element (piezoelectric type), but may be a MEMS (Micro Electro Mechanical Systems) type such as a piezoresistive type, a capacitance type, a thermal detection type, or a feedback coil by moving a movable coil. And a servo gauge type that measures strain caused by acceleration with a strain gauge, or the like.

  The light emitting unit 46 is configured to emit light based on a voltage supplied from the power supply control circuit unit 47, and is configured by, for example, an LED (light emitting diode). In FIG. 3, for the sake of simplicity, a single light emitting unit 46 is shown, but actually, a plurality of different light emitting units are provided.

  The power supply control circuit unit 47 is connected to the rechargeable battery 50, converts the power supply voltage supplied from the rechargeable battery 50 into a predetermined power supply voltage, and supplies the converted power supply voltage to the light emitting unit 46 and the like. Of course, the power supply control circuit unit 47 supplies power to other electronic components and functional blocks.

  The CPU 49 controls the entire mobile phone 1, and in particular, performs predetermined control on the RF circuit unit 41, the LCD control unit 42, the sound processing unit 43, and a camera (not shown). Further, the CPU 49 monitors the internal state such as the radio wave state by the main antenna 40 described above, the remaining amount of the rechargeable battery 50, the presence of missed calls and unread mails, and based on this result, the light emitting unit 46 Control is also performed to change the emission color or change the display content of the LCD display unit 21.

  Here, operations of the acceleration sensor 45 and the CPU 49 will be described.

  The acceleration sensor 45 is supplied with a constant power supply voltage from the power supply control circuit, and detects the change as acceleration data when the inclination of the mobile phone 1 changes. And CPU49 reads this. Further, the CPU 49 performs a predetermined calculation for obtaining the tilt angle for each of the three axes based on the read acceleration data, and grasps in which direction the mobile phone 1 is directed.

  The CPU 49 obtains the tilt angle of the mobile phone 1 from the acceleration data detected by the acceleration sensor 45, and controls the effects by the LCD display unit 21 and the light emitting unit 46 based on the tilt angle. For example, when an incoming call is received, a lighting location of a plurality of light emitting units 46 provided is determined according to an inclination angle, or a display image is changed according to the inclination angle in an application such as a game.

  Further, when a call signal for the own apparatus is detected by the RF circuit unit 41 as a communication means via a base station connected to the public communication network, the notification means is driven to notify the user of the incoming call. Here, the notification means includes incoming call display by the LCD display unit 21, light emission by the light emitting unit 46, vibration by the vibration motor 48, ringing by the speaker 22, and the like. When the user performs a response operation using the operation unit 11 while performing the incoming call notification, the incoming call notification is stopped and the RF circuit unit 41 shifts to a communication state.

  It is assumed that the acceleration sensor 45 mounted on the mobile phone 1 detects acceleration data in the X, Y, and Z directions orthogonal to each other shown in FIG.

  The acceleration sensor 45 becomes “0” in the no-load state with respect to each axis, and when acceleration to one side occurs with respect to the no-load state, a positive value is generated and acceleration in the opposite direction to this one occurs. Output a negative value. For the same magnitude of acceleration, the absolute value is configured to output the same value in both the positive and negative directions.

  FIG. 5 is a graph showing the transition of the tilt angle of the mobile phone 1 based on the acceleration data detected by the acceleration sensor 45. The inclination angle of each of the three axes changes substantially from the start of measurement, and then vibrates greatly by driving the vibration motor 48.

  As described above, when vibration is generated by the vibration motor 48, fluctuation due to vibration is added to the inclination angle that should be measured, which hinders control according to the inclination angle. The CPU 49 corrects the added fluctuation component by the method described below and acquires the original tilt angle.

First, the CPU 49 obtains the square root (√ (X ² + Y ² + Z ² )) of the sum of squares of the triaxial acceleration data. The square root of the sum of squares indicates the magnitude (acceleration value) of the acceleration vector, and the theoretical value in a stationary state is the gravitational acceleration magnitude (1G) regardless of the tilt angle.

  However, when a disturbance such as vibration caused by the vibration motor 48 is applied, the magnitude of the acceleration vector varies from 1G and vibrates greatly in the same manner as the triaxial acceleration data.

  The fluctuation value from the gravitational acceleration is monitored, and if the fluctuation value exceeds a predetermined threshold, it is determined that there is a disturbance. Then, the acceleration data to which the disturbance is applied is not used, but is replaced by the acceleration data acquired last time and determined to have no disturbance.

  Thereby, only the acceleration data when the magnitude of the acceleration vector is the magnitude of the gravitational acceleration, that is, when the acceleration as a disturbance is not added, is used. As a result, it is possible to eliminate the influence on the vibration by the vibration motor 48 and effectively perform the effect control according to the inclination angle.

  FIG. 6 is a flowchart showing processing when an incoming call is received by the mobile phone 1 according to an example of the preferred embodiment of the present invention.

  The acceleration sensor 45 acquires acceleration data at any time, and the CPU 49 acquires acceleration data in the first cycle. First, when the occurrence of an incoming call is detected, a timer (not shown) is started, and the first acceleration data is acquired for the acceleration determination by the CPU 49 as the first time of the first period (step S0: YES). Proceed to

  In step S <b> 1, the CPU 49 acquires acceleration data in the X-axis, Y-axis, and Z-axis directions by the acceleration sensor 45. This step is executed again after step S9 described later, and obtains acceleration data at a predetermined cycle.

  In step S2, the CPU 49 determines whether or not the vibration motor 48 is set to operate as one of incoming call notification means. If this determination is YES, acceleration as a disturbance is applied by driving the vibration motor 48, so that the process proceeds to step S3 to correct this disturbance. On the other hand, if this determination is NO, it is determined that there is no disturbance and the process proceeds to step S7.

  In step S3, the CPU 49 calculates the square root of the sum of squares of each value for the triaxial acceleration data acquired in step S1 (first calculation means).

  In step S4, the CPU 49 determines whether or not the value calculated in step S3 is within the range of gravitational acceleration magnitude (1G) ± threshold. If this determination is YES, the process proceeds to step S5, and if the determination is NO, the process proceeds to step S6.

  Here, the magnitude of the gravitational acceleration is processed as 1G of the theoretical value, but in reality, the acceleration may be different from the theoretical value due to a measurement error of the acceleration sensor 45. It is desirable to obtain and set the size of.

  In step S5, since it is determined that no disturbance is applied to the acquired acceleration data, the CPU 49 uses the acceleration data as it is without correcting it. Then, the acceleration data acquired this time is saved and stored for a correction opportunity in the next and subsequent cycles.

  In step S6, since disturbance is added to the acquired acceleration data, the CPU 49 replaces the acceleration data acquired this time with the previous acceleration data saved in step S5 (substitution means). Here, the saved previous acceleration data is acceleration data acquired immediately in the absence of disturbance, and is a correction assuming that the mobile phone 1 continues in the same state.

  Of course, when replacing with the previous acceleration data, the previous acceleration data itself of the replacement destination may already be replaced with the data of the previous time. In such a case, the last data finally adopted is carried over to the current data regardless of whether or not the previous data has been replaced.

  In Step 7, it is determined whether or not a second period (specifically, a period such as once every three first periods) has arrived. Here, when it is determined by the time measured by the timer that the second period has not yet arrived (when the determination is NO), the process returns to step S0, and the acceleration data is obtained every time the first period arrives. Will be acquired. On the other hand, when it is determined that the second period has arrived (when the determination is YES), the process proceeds to the inclination determination process in step S8 based on the acceleration data acquired so far.

  In step S8, the CPU 49 determines the tilt angle of the mobile phone 1 based on the acceleration data corrected in the above steps (second calculation means).

  In step S9, the CPU 49 performs an incoming call notification effect according to the inclination angle of the mobile phone 1 determined in step S8. Specifically, for example, effect control such as turning on one of the light emitting units 46 provided on the surface of the mobile phone 1 that is positioned above due to the inclination of the mobile phone 1 corresponds to this.

  In step S10, the CPU 49 determines whether the user has answered the phone. If this determination is YES, the timer is stopped and the acceleration sensor 45 is stopped or the acquisition of acceleration data is ended, and the effect due to the tilt of the mobile phone 1 is ended. On the other hand, if this determination is NO, in order to continue the effect, the process returns to step S0 and the acquisition of acceleration data is repeated.

  In this processing flow, acquisition of acceleration data is started after an incoming call. However, the present invention is not limited to this, and an alarm may be triggered or may be continuously performed even when there is no incoming call.

  Further, in this processing flow, the event for performing the effect by the inclination and the event for starting the vibration are made common, but these events may be different from each other. For example, in an application such as a game, when control is performed to change the screen display according to the inclination angle of the mobile phone 1, if vibration occurs due to an incoming call, this processing flow is started by starting the application, In step S2, the presence or absence of an incoming call is monitored. In step S10, the end of the application is determined.

  Thus, by correcting the acceleration data for a specific event such as an incoming call or execution of an application, vibration as a disturbance can be removed when necessary, and other controls, for example, When detecting the motion pattern, it is possible to prevent acquisition of erroneous acceleration data.

  Furthermore, according to the present embodiment, the determination of the inclination of the mobile phone 1 and the effect (steps S8 to S9) corresponding to the inclination are executed in the same cycle as the acquisition of the acceleration data, but the present invention is not limited to this. . Steps S8 to S9 may be separate routines and executed at a different cycle (interrupt processing or the like) from the acceleration data acquisition and correction.

  As a result, when acceleration data acquisition and correction can be processed in a short period of time compared to tilt determination and effect processing, more effective acceleration data without disturbance may be acquired. As a result, it may be possible to reduce delays and mistakes in production caused by missing acquisition of acceleration data due to disturbance.

  Furthermore, the corrected acceleration data acquired in the first cycle is rapidly increased by extending the second cycle in which the discrimination and presentation of the inclination is made longer than the first cycle in which the output value of the acceleration sensor 45 is acquired. Even if the transition is smooth, no particular correction is required when the value returns to the normal value before the arrival of the second period. Even if it does not return to the normal value, it may be perceived as a smooth change.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

It is a figure which shows the change of the measured value of an inclination angle when the vibration motor of the conventional mobile telephone act | operates. 1 is an external perspective view of a mobile phone according to an example of a preferred embodiment of the present invention. It is a block diagram which shows the function of the mobile telephone which concerns on an example of suitable embodiment of this invention. It is a figure which shows the triaxial direction of X, Y, Z of the acceleration sensor which concerns on an example of suitable embodiment of this invention. It is a graph which shows transition of the inclination angle of the mobile telephone which concerns on an example of suitable embodiment of this invention. It is a flowchart which shows a process when there exists an incoming call in the mobile telephone 1 which concerns on an example of suitable embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile phone 2 Operation part side housing | casing 3 Display part side housing | casing 11 Operation part 12 Microphone 21 LCD display part 22 Speaker 23 Driver IC
40 Main antenna 41 RF circuit unit 42 LCD control unit 43 Audio processing unit 44 Memory 45 Acceleration sensor 46 Light emitting unit 47 Power supply control circuit unit 48 Vibration motor 49 CPU
50 rechargeable battery

Claims (6)

A portable electronic device having a device that generates vibration and an acceleration sensor that detects acceleration data of three axes orthogonal to each other in a first period,
First calculation means for acquiring three-axis acceleration data detected by the acceleration sensor and calculating an acceleration value that is a magnitude of an acceleration vector;
When the difference between the acceleration value calculated by the first calculation means and the acceleration value in a stationary state is greater than or equal to a predetermined value, the detected three-axis acceleration data is the previous acceleration data in the first period, respectively. A replacement electronic device, and a portable electronic device.   The replacement means includes, as a difference between the acceleration value calculated by the first calculation means and the acceleration value in a stationary state, a square root of a sum of squares of acceleration data for each of the three axes and a value indicating one gravitational acceleration. The portable electronic device according to claim 1, wherein the portable electronic device is obtained by a difference. And further comprising detection means for detecting the occurrence of an event accompanied by driving of the device,
The portable electronic device according to claim 1, wherein the replacement unit causes the replacement unit to function when an occurrence of an event is detected by the detection unit. Second calculating means for calculating an inclination angle of each of the three axes based on acceleration data detected by the acceleration sensor in a second period longer than the first period;
4. The portable electronic device according to claim 1, further comprising a control unit that controls an effect according to the tilt angle calculated by the second calculation unit. 5. A communication means for detecting a calling signal for the device;
The device is a vibrator;
In the case where vibration notification by the vibrator is designated as notification means for detecting a call signal by the communication means and performing call notification, the replacement means functions when the call signal is detected, and the notification means 3. The portable electronic device according to claim 1, wherein when the vibrator is not designated, the replacement unit does not function even if the call signal is detected. Second calculating means for calculating an inclination angle of each of the three axes based on acceleration data detected by the acceleration sensor in a second period longer than the first period;
Control means for controlling an effect according to the inclination angle calculated by the second calculation means,
The portable electronic device according to claim 5, wherein the control unit controls an effect with respect to notification when the communication unit detects a call signal and issues a call notification.

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