Title:
METHOD FOR REMOVING FOREIGN MATTER ON SURFACE OF GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2004/069760
Kind Code:
A1
Abstract:
A method for removing a tin defect present on the surface of a glass substrate produced by a floating method in a short time regardless of the temperature of the glass substrate without damaging the surface of the glass substrate. A method for removing foreign matter containing tin from the surface of a glass substrate is characterized in that a pulse laser beam is applied to the front surface of a glass substrate produced by a floating method, the pulse laser beam satisfies a specific relation between the pulse width, wavelength, and energy density per unit area of the glass substrate and is transmitted through the glass substrate with a transmittance of 70% to the laser beam, and the foreign matter present on the back of the glass substrate is removed.
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Inventors:
HIROMATSU KUNIAKI (JP)
WATANABE YUZO (JP)
IGA MOTOICHI (JP)
WATANABE YUZO (JP)
IGA MOTOICHI (JP)
Application Number:
PCT/JP2004/001041
Publication Date:
August 19, 2004
Filing Date:
February 03, 2004
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
HIROMATSU KUNIAKI (JP)
WATANABE YUZO (JP)
IGA MOTOICHI (JP)
HIROMATSU KUNIAKI (JP)
WATANABE YUZO (JP)
IGA MOTOICHI (JP)
International Classes:
B08B7/00; C03C23/00; (IPC1-7): C03C23/00; B01J19/08; C03C3/078; C03C3/085; C03C3/087; C03C3/089; C03C3/091; C03C3/093
Foreign References:
| JPH0515474A | 1993-01-26 | |||
| JPH0333038A | 1991-02-13 | |||
| JPH1085684A | 1998-04-07 | |||
| JPH09295832A | 1997-11-18 | |||
| US6500778B1 | 2002-12-31 | |||
| US20020010066A1 | 2002-01-24 |
Attorney, Agent or Firm:
Senmyo, Kenji (38 Kanda-Higashimatsushitacho, Chiyoda-k, Tokyo 42, JP)
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