Title:
落下検知装置
Document Type and Number:
Japanese Patent JP4168407
Kind Code:
B2
Abstract:
A fall detection device is provided, which accomplishes a fall judgment on acceleration by a simple calculation and improves uniformity of effective threshold value for the acceleration judgment as to a direction of an applied acceleration vector. The fall detection device produces a fall detection signal, when an absolute value of each axis component of an acceleration measured by a three-axis acceleration sensor 1 is less than a first threshold value, and when a sum of the absolute values of the axis components of the acceleration is less than a second threshold value that is 1.5 times to twice the first threshold value.
Inventors:
Masaru Noda
Yasunori Abe
Yasunori Abe
Application Number:
JP2005228026A
Publication Date:
October 22, 2008
Filing Date:
August 05, 2005
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
G11B21/12; G01H11/06; G01P15/18; G01V7/00
Domestic Patent References:
| JP7201124A | ||||
| JP2005346840A | ||||
| JP2004146036A | ||||
| JP2001118026A |