Abstract:
The hand-held electronic device includes a central processing unit, a memory unit, a state-detecting unit, a state-determining unit, a main power supply unit, a standby power supply unit, and a power supply switching unit. After determining the presence of a fall state, the state-determining unit will output a fall prevention instruction and which causes the central processing unit to enter a low-potential current mode; meanwhile, the power supply switching unit monitors power output and continues to supply low-potential power. In case of a fall of the hand-held electronic device, the device and method protect operation data and reduce the otherwise power-consuming current. The less power-consuming current is conducive to the reduction of capacitance required for a backup battery. The low-potential current mode is effective in reducing the time taken to recover the operation mode of the electronic device.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 098137795 filed in Taiwan, R.O.C. on 6 Nov. 2009, the entire contents of which are hereby incorporated by reference. 
       FIELD OF THE INVENTION 
       [0002]    The present invention relates to a hand-held electronic devices and methods for preventing fall of the same, and more particularly, to a hand-held electronic device and a method for preventing fall thereof which are provided with a fall prevention mechanism. 
       BACKGROUND OF THE INVENTION 
       [0003]    If an existing hand-held electronic device, such as a cell phone, PDA, GPS, or media player, falls inadvertently while in an ON state and thus hits something else, it not only will influence the appearance of the casing of the hand-held electronic device, but even worse, it will interrupt the internal operation of the hand-held electronic device and cause the losses or damages of operating data. 
         [0004]    U.S. patent application NO 20080218366, a document pertinent to the prior art, discloses a protection system of a portable electronic device comprising an accelerometer, which is configured to measure an acceleration signal generated from movement in at least one direction; and a processor is configured to receive the acceleration signal and compare that signal with a preset value in order to judge whether an fall or an impact is occurred. The central processor unit may start the mode of “turn of” to shut down the portable electronic device according to an inbuilt routine if the fall or the impact is detected. 
         [0005]    However, it takes unduly long time for the portable electronic device to enter the protection mechanism for the shutdown routine, and it also takes unduly long time to execute the shutdown routine. In practice, the execution of a shutdown routine is seldom totally completed when an impact occurs to an electronic device, and consequently, the electronic device may meet the conditions of data loss or damage. Moreover, it is inconvenient and time-consuming to restart an electronic device after a shutdown routine has done. Furthermore, a battery of an electronic device is likely to be disconnected as soon as an impact is exerted upon the electronic device, and the disconnection of the battery from the electronic device is immediately followed by interruption of a shutdown routine which may result in the data loss or damage, because the required power for the operation of the electronic device is supplied by the battery. 
       SUMMARY OF THE INVENTION 
       [0006]    It is a primary objective of the present invention to provide a hand-held electronic device and a method for preventing fall of the same so as to protect the same against data loss when they are under operation. 
         [0007]    Another objective of the present invention is to provide a hand-held electronic device and a method for preventing fall of the same, so as to reduce the time required for operation of a fall prevention mechanism and speed up the transition from a protection state to an operation state of the same. 
         [0008]    Yet another objective of the present invention is to provide a hand-held electronic device and a method for preventing fall of the same so as to prevent, during operation of the same, the loss of data which might otherwise occur when a primary battery is disconnected from the same because of the fall of the same. 
         [0009]    To achieve the above and other objectives, the present invention provides a hand-held electronic device comprising: a state-detecting unit for detecting a motion state of the hand-held electronic device and accordingly, generating the state information; a state-determining unit electrically connected to the state-detecting unit and configured to receive the state information and selectively output a fall prevention instruction according to a preset parameter of the safe motion state; a central processing unit electrically connected to the state-determining unit and configured to receive the fall prevention instruction and store operation data during operation of the hand-held electronic device according to the fall prevention instruction before entering a low-potential current mode; a memory unit electrically connected to the central processing unit and configured to store the parameter of the safe motion state and the operation data; a main power supply unit; a standby power supply unit for supplying power required for the low-potential current mode, wherein capacitance of the standby power supply unit is less than that of the main power supply unit; and a power supply switching unit connected to the main power supply unit, the standby power supply unit, and the central processing unit which are configured to switch between the main power supply unit and the standby power supply unit. 
         [0010]    To achieve the above and other objectives, the present invention provides a method for preventing fall of a hand-held electronic device, comprising the steps of: (1) detecting a motion state of an outside and generating state information; (2) comparing the state information with a preset safe movement state parameter and generating a fall prevention instruction if the state information exceeds a range of the safe movement state parameter; (3) storing operation data in operation according to the fall prevention instruction; and (4) switching to a low-potential current mode and, upon disconnection of a main power supply unit, switching to a standby power supply unit, wherein the standby power supply unit has capacitance lower than capacitance of the main power supply unit. 
         [0011]    The state-detecting unit may be one of an acceleration detector, a gyroscope, or a combination of the acceleration detector and the gyroscope. The low-potential current mode may be a hibernation mode or a standby mode. 
         [0012]    According to the present invention, upon a fall of a hand-held electronic device, operation data of the hand-held electronic device is stored for backup and the hand-held electronic device enters a low-potential current mode so as to reduce power-consuming current. Unlike a shutdown mode, the low-potential current mode does not totally shut down the hand-held electronic device; instead, it can quickly transit from the low-potential current mode to the operation mode. Also, there is little power consumption in the low-potential current mode, and thus capacitance of the standby power supply unit can be reduced to thereby prevent hit-induced disconnection and ensuing power failure. In case of disconnection and resultant power failure of the main power supply unit, the standby power supply unit supplies power required for the low-potential current mode. By giving the aforesaid fall prevention mechanism of the present invention, there can be lenient fastening requirements for a fastening element configured for use with the main power supply unit, which allows the fastening mechanism designed with more flexibility. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]      FIG. 1  is a functional block diagram of a hand-held electronic device in an embodiment according to the present invention; 
           [0014]      FIG. 2  is a functional block diagram of the hand-held electronic device in another embodiment for comparison according to the present invention; 
           [0015]      FIG. 3  is a flow chart of a method for preventing fall of a hand-held electronic device in an embodiment according to the present invention; and 
           [0016]      FIG. 4  is a flow chart of a method for preventing fall of a hand-held data collecting device in another embodiment according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0017]    To enable persons skilled in the art to gain insight into the objectives, features, and effects of the present invention, the present invention is illustrated with the following specific embodiments in conjunction with the accompanying drawings. The present invention is described in detail as follows. 
         [0018]    Referring to  FIG. 1 , there is shown a functional block diagram of a hand-held electronic device in an embodiment according to the present invention. As shown in the drawing, the present invention provides a hand-held electronic device  1  comprising a state-detecting unit  10 , a state-determining unit  11 , a central processing unit  12 , a memory unit  13 , a power supply switching unit  14 , a main power supply unit  15 , and a standby power supply unit  16 . 
         [0019]    The state-detecting unit  10  is configured to detect a motion state in the outside of the state-detecting unit  10  and generate state information according to the result of the detecting the motion state. The outside of the state-detecting unit  10  is narrowly defined as the hand-held electronic device  1  itself. The state-detecting unit  10  is an acceleration detector, a gyroscope, or a combination of the acceleration detector and the gyroscope, or any other equivalent state-detecting device. 
         [0020]    When the hand-held electronic device  1  falls off or slips out of a user&#39;s hand, the hand-held electronic device  1  falls under gravity in the absence of any other supporting force; meanwhile, the hand-held electronic device  1  undergoes free fall and its acceleration is equal to the acceleration of gravity. The state is known as a fall state. 
         [0021]    The acceleration detector is a sensing module for sensing acceleration in three dimensions and comprises a x-axis sensor, a y-axis sensor, and a z-axis sensor for sensing linear acceleration of the hand-held electronic device  1  along the x-axis, y-axis, and z-axis, respectively. Additionally, the gyroscope which mainly measures angular acceleration of a rotating object is configured to measure rotational movement of the hand-held electronic device  1 . Therefore, when the state-detecting unit  10  is the acceleration detector, the state-detecting unit  10  senses linear acceleration of the hand-held electronic device  1  in all directions. When the state-detecting unit  10  is the gyroscope, the state-detecting unit  10  senses angular acceleration of the hand-held electronic device  1  in rotational movement. When the state-detecting unit  10  is a combination of the acceleration detector and the gyroscope, the state-detecting unit  10  accurately measures the movement of the hand-held electronic device  1 . With the aforesaid apparatuses, it is feasible to identify different states of the hand-held electronic device  1 , such as a fall state, a rotation state, or an ejection state. 
         [0022]    The state-determining unit  11  is electrically connected to the state-detecting unit  10  and configured to receive the state information. If the state information shows that the hand-held electronic device  1  exceeds the range of a preset safe movement state parameter, it means that the hand-held electronic device  1  is in the fall state. If acceleration exceeds a specific value, the state-determining unit  11  sends out a fall prevention instruction. 
         [0023]    The central processing unit  12  is electrically connected to the state-determining unit  11  and configured to switch, upon receipt of the fall prevention instruction, the hand-held electronic device  1  to a low-potential current mode. The low-potential current mode is in a hibernation mode or a standby mode. The hand-held electronic device  1  consumes much less power in the low-potential current mode than in a typical operation mode. 
         [0024]    The memory unit  13  is electrically connected to the central processing unit  12  and configured to store operation data of the hand-held electronic device  1  in operation and store a preset parameter of safe movement state. To protect the operation data of the hand-held electronic device  1  against loss or damage due to hit-induced power interruption, the central processing unit  12  instructs the memory unit  13  to store the operation data of the hand-held electronic device  1  in operation as soon as the fall state is identified. 
         [0025]    The power supply switching unit  14  which is configured to switch power supplied to the hand-held electronic device  1  is connected to a main power supply unit  15  and a standby power supply unit  16 . Upon the disconnection of the main power supply unit  15 , the output of the power supply switching unit  14  is switched to the standby power supply unit  16 . Owing to the lower power requirements for the low-potential current mode, capacitance of the standby power supply unit  16  can be less than that of the main power supply unit  15  to thereby greatly reduce the size of the standby power supply unit  16  and, for example, allow the standby power supply unit  16  to be integrated into an inbuilt motherboard (circuit board) so as to prevent a hit-induced fall. 
         [0026]    To implement the present invention, the state-detecting unit  10  detects a motion state of the outside (that is, the hand-held electronic device  1 ) and generates state information. Then, the state information is output to the state-determining unit  11 . If the state information exceeds the range of a safe movement state parameter, the state-determining unit  11  generates a fall prevention instruction and outputs the fall prevention instruction to the central processing unit  12 . Afterward, the central processing unit  12  stores operation data during operation of the hand-held electronic device  1  to the memory unit  13  according to the fall prevention instruction and enables the hand-held electronic device  1  to enter the low-potential current mode. Finally, power output is put under surveillance such that the power supply switching unit  14  switches, upon disconnection and thus power failure of the main power supply unit  15 , to the standby power supply unit  16  for supplying power required for the low-potential current mode. 
         [0027]    In an embodiment, the hand-held electronic device  1  is a hand-held data collecting device, a hand-held communication device, or a hand-held data processor. 
         [0028]    Referring to  FIG. 2 , there is shown a functional block diagram of the hand-held electronic device in another embodiment according to the present invention. As shown in the drawing, a hand-held electronic device  2  comprises an acceleration detector  20   a , a gyroscope  20   b , a state-determining unit  21 , a central processing unit  22 , a memory  23 , a power switching module  24 , a primary battery  25   a , a backup battery  25   b , and a data collecting module  27 . In this embodiment, the central processing unit  22  instructs a peripheral device, that is, the data collecting module  27 , to collect data, and thus data security is of vital importance, because a data collection operation entails accessing plenty of data in the form of barcode data, for example. 
         [0029]    To implement the present invention, a motion state of the outside (that is, the hand-held electronic device  2 ) is detected by the acceleration detector  20   a  and the gyroscope  20   b . The acceleration detector  20   a  detects the level and direction of acceleration of the hand-held electronic device  2 . In this embodiment, to determine in real time whether the hand-held electronic device  2  is in the fall state, it is necessary to determine whether the output value of the acceleration detector  20   a  exceeds the parameter of safe movement state stored on the memory  23 . Take the fall state as an example, the gravity (acceleration) of the Earth is denoted with G. For instance, if the acceleration detector  20   a  outputs a downward G value for a specific period of time, falling a distance of more than 1.225 meters for 0.5 second or falling a distance of more than 4.9 meters for 1 second indicates that the hand-held electronic device  2  is in the fall state. For instance, if acceleration values in all directions are output within a very short period of time, it indicates that the hand-held electronic device  2  is very likely to be in a hit or tumble state. Also, take the gyroscope  20   b  as an example, since the axle of the gyroscope  20   b  always points in a fixed direction, a comparison of the fixed direction with the axis along which the hand-held electronic device  2  moves allows the direction of the movement of the hand-held electronic device  2  to be accurately identified. If the hand-held electronic device  2  moves towards the ground for a specific period of time, it indicates that the hand-held electronic device  2  is in the fall state. The critical ranges of the aforesaid states can be preset with respect to the safe movement state parameter. 
         [0030]    Upon its receipt of the information of fall state, the state-determining unit  21  generates a fall prevention instruction and outputs the fall prevention instruction to the central processing unit  22 . The purpose of the fall prevention instruction is to allow the hand-held electronic device  2  to shut down the power of a peripheral device, that is, to shut down the power of the data collecting module  27 , and allow the hand-held electronic device  2  to operate in the low-potential current mode, such as a hibernation mode or a standby mode. Afterward, to protect the operation data against hit-induced power interruption and thus resultant data loss or damage, the central processing unit  22  stores the operation data of the data collecting module  27  to the memory  23  according to the fall prevention instruction and enables the hand-held electronic device  2  to enter a low power consumption mode. Eventually, the power switching module  24  monitors the power output of the primary battery  25   a  having high capacitance such that the power switching module  24  switches, upon disconnection of the primary battery  25   a , to the backup battery  25   b  having low capacitance for supplying low-potential power required for the low-potential current mode. 
         [0031]    The device and method of the present invention prevents data loss or damage which might otherwise occur due to sudden power interruption while the data collecting module  27  is operating, enables the hand-held electronic device to enter a low power consumption state as soon as the operation data is stored, and allows standby power to be of low capacitance. By giving the aforesaid fall prevention mechanism of the present invention, there can be lenient fastening requirements for a fastening element configured for use with the main power supply unit, which allows the fastening mechanism design to be flexible. 
         [0032]    Referring to  FIG. 3 , it is shown a flow chart of a method for preventing fall of a hand-held electronic device in an embodiment according to the present invention. In step S 30 , a state-detecting unit detects a motion state of the outside and generates state information. Then step S 31  involves comparing the state information with a preset parameter of safe movement state and generating a fall prevention instruction if the state information indicates that the hand-held electronic device is in a fall state. Step S 32  involves receiving the fall prevention instruction by a central processing unit and storing operation data in operation to a memory unit according to the fall prevention instruction. Step S 33  involves switching to a low-potential current mode and switching, if the main power supply unit comes off to thereby be disconnected, to a standby power supply unit of low capacitance for supplying low-potential power. 
         [0033]    A method for preventing fall of a hand-held data collecting device according to the present invention allows a central processing unit to reduce power-consuming current required for normal movement to 3 mA from a range of current between 100 mA and 600 mA in a very short period of time (such as 1 millisecond) to thereby prevent data loss and reduce the load of the standby power supply unit. 
         [0034]    Referring to  FIG. 4 , it is shown a flow chart of a method for preventing fall of a hand-held data collecting device in another embodiment according to the present invention. As shown in the drawing, step S 40  involves detecting a motion state of the outside (that is, the hand-held data collecting device) and generating state information. Step S 41  involves reading and analyzing state information and, if it is determined that acceleration of the hand-held data collecting device is normal (i.e., the acceleration does not exceed the range of a preset parameter of safe movement state, thereby ruling out a state of fall, ejection, or tumble), going to step S 42  to allow the system to function and continue the execution of a surveillance routine before returning to step S 40 , and, if it is determined that acceleration of the hand-held data collecting device is abnormal (i.e., the acceleration exceeds the range of a preset parameter of safe movement state, thereby conforming a state of fall, ejection, or tumble), going to step S 43 . Step S 43  involves instructing the hand-held data collecting device to execute a low-potential current mode selected from one of a hibernation mode and an interruption mode and then, go to step S 44  for determining whether a battery is disconnected. Step S 44  involves determining whether a primary battery is disconnected and, if it is determined that the primary battery is present (i.e., the primary battery is not disconnected), going to step S 45 , and, if it is determined that the primary battery is disconnected, going to step S 46 . Step S 45  involves continuing the output of the output power from the primary battery. Step S 46  involves switching the output of the output power such that the output power is output from a backup battery. Finally, step S 47  involves awaiting restart, that is, be ready to exit the low-potential current mode and restore the normal operation mode. 
         [0035]    In an embodiment, in step S 40 , the motion state is detected by a gyroscope, an acceleration detector, or a combination of the acceleration detector and the gyroscope. 
         [0036]    In another embodiment, power-consuming current is reduced to about 3 mA as soon as the hand-held electronic device enters the low power consumption mode. 
         [0037]    The present invention provides a hand-held electronic device and a method for preventing fall of the same described herein, so as to detect a fall state of the hand-held electronic device, store operation data according to the result of the detecting the fall state, and switch power upon disconnection of a battery. The device and method of the present invention are advantageously characterized by a simplified fastening element configured for use with the battery, reduced capacitance of a standby power, enhanced security of operation data, reduced time taken to recover an operation mode, and enhanced operation efficiency. Hence, the present invention solves related problems facing the prior art in terms of fall prevention for a hand-held electronic device. 
         [0038]    The present invention is disclosed in the above preferred embodiments. Persons skilled in the art should understand that the embodiments are provided to illustrate the present invention but are not interpreted to be restrictive of the scope of the present invention. It should be noted that all variations and replacements equivalent to the embodiments can be made according to the spirit and principle in the disclosure of the present invention and still fall within the scope of the invention as set forth in the appended claims. Hence, the scope of protection for the present invention should be defined by the appended claims.