Patent ID: 8682607
Filing Date: 2014-03-25
Classification: G01P

Abstract:
1. A motion state detector comprising: a sensor which includes a pair of electrodes disposed so as to face each other so that mutual positional relationship is fixed, and a movable spherical conductor disposed between the pair of electrodes so as to put the pair of electrodes into either a conduction state or a non-conduction state; and an arithmetic processor that detects at least one of a change from the conduction state to the non-conduction state and a change from the non-conduction state to the conduction state as a detection state and calculates a measurement value from the detection state, wherein the arithmetic processor is configured to: define a plurality of level values which is determined by the proportion of a duration of the conduction state in a unit time period; calculate a level value in the unit time period among the plurality of level values as a first level value; add a second predetermined value to the first level value to calculate a second level value; calculate the sum of squares of a plurality of first level values in a plurality of consecutive unit time periods as a first detection value and calculate the sum of squares of a plurality of second level values as a second detection value; use the first detection value as a measurement value when the first detection value is equal to or smaller than a first predetermined value; and use the second detection value as the measurement value when the first detection value is larger than the first predetermined value.