The assignee for this patent application is
Reporters obtained the following quote from the background information supplied by the inventors: "Conventionally, there has been a technique for detecting the acceleration of an object in movement and determining the state of the object based on the detection result, using an acceleration sensor. This acceleration sensor realizing the technique includes a low range sensor suitable for detection of low acceleration and a high range sensor suitable for detection of high acceleration. The low range acceleration sensor has a high resolution in detection of acceleration about .+-.5 G or lower, and is thus suitable for determining some state, such as walking involving the acceleration of 0.5 to 2.0 G. It is used, for example, for a pedometer for mobile terminals. On the other hand, the high range acceleration sensor has a high resolution in detection of acceleration about .+-.70 G, and is thus suitable for determining some state, such as dropping involving an impact of several ten to 100 G. In recent years, there has been proposed a mobile terminal which has a plurality of acceleration sensors with different ranges and switches between these sensors in accordance with the aspect. Patent Literature 1: Japanese Laid-open Patent Publication No. 2008-175771
"However, the acceleration range that can accurately be detected by the acceleration sensor is restricted for each sensor, and there does not exist acceleration sensor that has a high resolution in all ranges. For example, because the dropping of a mobile terminal involves a strong impact thereon, the low range acceleration sensor does not detect the accurate acceleration. In view of this circumstance, it may be considered that the drop determination may be performed by the high range acceleration sensor. However, it is difficult to adopt the high range acceleration sensor into the application requiring acceleration detection with a high resolution in a low range. That is, if a high range acceleration sensor is installed in a mobile terminal, a problem is the difficulty of realizing the function of the application, such as the pedometer. As described above, in combination of both of the low range and high range acceleration sensors, acceleration detection is possible in a wide range. However, installation of a plurality of acceleration sensors into the mobile terminal may be a factor of hindering the miniaturization or weight reduction."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventor's summary information for this patent application: "To solve the above problem and attain the object, a drop determining device disclosed in this application, according to an aspect, includes a detecting unit, a calculating unit, and a determining unit. The detecting unit detects acceleration within a predetermined range. The calculating unit calculates acceleration outside the predetermined range, using the acceleration detected by the detecting unit. The determining unit determines whether drop has occurred, using the acceleration calculated by the calculating unit.
"The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
"It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention.
BRIEF DESCRIPTION OF DRAWINGS
"FIG. 1 is a diagram illustrating a functional configuration of a mobile terminal;
"FIG. 2 is a diagram illustrating a data storage example in an acceleration conversion table, in a first embodiment;
"FIG. 3 is a diagram illustrating a hardware configuration of the mobile terminal;
"FIG. 4 is a flowchart for explaining an operation of the mobile terminal in the first embodiment;
"FIG. 5 is a diagram for explaining a procedure for calculating the impact time and the acceleration at impact, in the first embodiment;
"FIG. 6 is a diagram illustrating a data storage example in the acceleration conversion table, in a second embodiment;
"FIG. 7 is a flowchart for explaining an operation of a mobile terminal, in the second embodiment;
"FIG. 8 is a diagram for explaining a procedure for calculating the range of the impact time and the acceleration at impact, in the second embodiment; and
"FIG. 9 is a diagram illustrating a computer that executes a drop determining program."
For more information, see this patent application: KASAMA, Kouichirou. Drop Determining Device and Drop Determining Method. Filed
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