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Title:
SEISMOMETER
Document Type and Number:
Japanese Patent JP3687253
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To reduce the power consumption by operating a vibration level detecting means only when the signal of a comparing circuit becomes a prescribed signal.
SOLUTION: When the signal of a vibration acceleration sensor 9 becomes out of the range of a prescribed signal level set by a wind comparator 14, the prescribed signal is outputted from the comparator 14. When the input board 16 of a micro-computer 17 operated with low power consumption in the stand-by mode receives this signal, an operation control means 24 operates a program, and A/D converters 18, 19 A/D-convert the signals of amplifying circuits 11, 12 to obtain vibration acceleration. The vibration level is calculated by the vector synthesis from individual acceleration levels. The input to the micro-computer 17 is waited until the sensor 9 or a sensor 10 becomes out of the range, and power can be suppressed. The micro-computer 17 is operated only when the signals of the circuits of the sensors 9, 10 become the prescribed signals, and the power consumption can be suppressed.


Inventors:
Yasuhiro Umekage
Application Number:
JP5131197A
Publication Date:
August 24, 2005
Filing Date:
March 06, 1997
Export Citation:
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Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01V1/18; G01H1/00; G01H1/16; (IPC1-7): G01H1/16; G01H1/00; G01V1/18
Domestic Patent References:
JP3105221A
JP8077475A
JP10142141A
JP4027828A
Attorney, Agent or Firm:
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito