PLATE GLASS CRACK DETECTION METHOD AND DETECTOR, AND PLATE GLASS POLISHING METHOD AND DEVICE

WIPO Patent Application WO/2006/009222

A1

A detector for detecting the cracking sound of plate glass under polishing while discriminating it from the cracking sound of other plate glass. More specifically, sounds are collected by a microphone (30) and high frequency sounds are extracted by a filter (40). With regard to the high frequency sounds extracted through the filter (40), a sound level becoming highest within a predetermined time T1 (T1=10 msec) is acquired every predetermined time T1. Lowest sound level among the sound levels thus acquired within a predetermined time T2 (T2=300 msec) in the past is then acquired as a steady sound level. One count is added when the ratio between the current sound level acquired every predetermined time T1 and the steady sound level exceeds a predetermined value (2.5). The third process and the fourth process are repeated every predetermined time T1 until the count reaches 10. When the count reaches 10 within a predetermined time T3 (5 sec), a decision is made that plate glass G has cracked and a signal indicating cracking is delivered to a control section (24).

KIYAMA ATSUSHI (JP)
YAKU MASASHI (JP)
TOMARU YOSHIHIRO (JP)

PCT/JP2005/013419

January 26, 2006

July 21, 2005

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ASAHI GLASS FINE TECHNO CO LTD (JP)
KIYAMA ATSUSHI (JP)
YAKU MASASHI (JP)
TOMARU YOSHIHIRO (JP)

B24B7/24; B24B37/04; B24B49/10; (IPC1-7): B24B7/24; B24B7/04; B24B49/10

JPS61132861A	1986-06-20
JP2000024919A	2000-01-25
JPS5676044A	1981-06-23
JPS6069550A	1985-04-20
JPS62197891A	1987-09-01
JPH04195298A	1992-07-15
JPS6079261A	1985-05-07

Senmyo, Kenji (38 Kanda-Higashimatsushitach, Chiyoda-ku Tokyo 42, JP)

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