Title:
GLASS SUBSTRATE AND METHOD FOR MANUFACTURING GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2011/162163
Kind Code:
A1
Abstract:
The amount of adhesion of cullet to the major planar surface of a glass substrate due to the grinding of an end surface is reduced.
An end surface (12) of a glass substrate (10) is ground into an elliptical shape. The ellipse is defined by the ratio of a long side (a) and a short side (b) and is formed into a continuous elliptical curved surface by the curvature radius (R1) of an upper curved surface (12a), the curvature radius (R2) of a lower curved surface (12b), and the curvature radius (R3) of an intermediate curved surface (12c). The curvature radiuses (R1-R3) have the relationships of R1 ≤ R2, and R2 ≤ R3 or the relationships of R1 = R2, R3 > R2, and R3 > R1. The distance (c) from the center (O) of the end surface (12) to the boundaries (P) at which tangential lines (S1, S2) depart from the major planar surface of the substrate (10) is less than the distance in conventional cases in which the end surface (12) is chamfered or formed into a semicircular shape. The configuration changes the direction of scatter of cullet, which is produced in the step of end surface grinding, to cause the cullet to scatter further toward the end surface (12) side, and as a result, the amount of adhesion of the cullet to the major planar surface (14) of the glass substrate (10) is reduced.
Inventors:
MIYAMOTO Mikio (Limited. 12-1, Yurakucho 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
Application Number:
JP2011/063824
Publication Date:
December 29, 2011
Filing Date:
June 16, 2011
Export Citation:
Assignee:
Asahi Glass Company, Limited. (5-1 Marunouchi 1-chome, Chiyoda-ku Tokyo, 05, 〒1008405, JP)
旭硝子株式会社 (〒05 東京都千代田区丸の内一丁目５番１号 Tokyo, 〒1008405, JP)
旭硝子株式会社 (〒05 東京都千代田区丸の内一丁目５番１号 Tokyo, 〒1008405, JP)
International Classes:
C03C19/00; B24B9/00; B24B9/10
Attorney, Agent or Firm:
OGURI Shohei et al. (Eikoh Patent Firm, Toranomon East Bldg. 10F 7-13, Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
Claims: