Title:
NATURAL FREQUENCY MEASURING DEVICE AND TENSION MEASURING DEVICE
Document Type and Number:
Japanese Patent JP3776232
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To measure the tension of a belt laid on an on board belt device while eliminating the effect of background noise.
SOLUTION: A vibration waveform detected by a microphone 3 is amplified by an amplifier (amplifying means) 12, shaped by a comparator 5 (waveform shaping means), and then supplied to a belt natural frequency detecting part. A gain regulator 13 has a means for detecting the level of background noise from the vibration waveform outputted from the waveform shaping means 5. It automatically regulates the amplification gain of the amplifying means 12 to the lower side when the background noise level is a scheduled value or higher, and to the higher side when it is lower than the scheduled value.
Inventors:
Atsushi Kawachi
Takashi Kawachi
Hiroyuki Market
Haruhiko Nakamura
Takashi Kawachi
Hiroyuki Market
Haruhiko Nakamura
Application Number:
JP5889498A
Publication Date:
May 17, 2006
Filing Date:
February 24, 1998
Export Citation:
Assignee:
Kawachi Laboratory Co., Ltd.
Gates Unitta Asia Co., Ltd.
Gates Unitta Asia Co., Ltd.
International Classes:
G01L5/10; G01H13/00; (IPC1-7): G01L5/10; G01H13/00
Domestic Patent References:
| JP663825B2 | ||||
| JP6367199B1 | ||||
| JP63318807A | ||||
| JP922180A |
Attorney, Agent or Firm:
Kaori Tanaka
Michito Hiraki
Sanji Tanabe
Michito Hiraki
Sanji Tanabe