公开(公告)号：JP2002265229A

公开(公告)日：2002-09-18

申请号：JP2001066288

申请日：2001-03-09

Applicant: HOYA CORP

Inventor： MAEDA NOBUHIRO ,  TAKAHASHI FUMIHIRO

IPC: G02B3/00 ,  C03B11/00 ,  C03B17/06 ,  C03B19/02 ,  C03B33/02 ,  C03C19/00

Abstract: PROBLEM TO BE SOLVED: To continuously form a glass sheet to uniform thickness from fused glass without generating defects such as cavity and crack. SOLUTION: In this manufacturing method, fused glass 3 which flows out of an orifice 4 at constant rate is continuously cast into a casting die 1 which is provided with a pair of opposing side walls 12a, 13a which specify the width of the glass sheet and a bottom surface 11a which forms one side of two opposing main surfaces of the glass sheet, the glass which is cast along the walls 12a, 13a of both sides is moved from the upstream side to the down stream side, at the same time, the operation of pressing a cooling body 2 against the upper surface of glass, and then, separating the cooling body 2 from the upper surface of glass is repeated, thereby, the upper surface is cooled, and thus, a planar glass sheet is continuously formed in the moving direction of the glass. Therein, the nearer to the side walls 12a, 13a of the upper surface of the glass 3 which is in a softened state a part is, the cooling at the part starts on the more upstream side.

公开(公告)号：JPH1111973A

公开(公告)日：1999-01-19

申请号：JP17650597

申请日：1997-06-17

Applicant: HOYA CORP

Inventor： MAEDA NOBUHIRO ,  UCHIDA KAZUYA

IPC: C03B40/02 ,  C03B40/027 ,  G11B5/84

Abstract: PROBLEM TO BE SOLVED: To obtain a thin glass substrate having high flatness without scratches by suspending or dispersing an inorg. powder in a solvent which does not produce a decomposed gas to prepare a soln., applying the prepared soln. on the surface of a sheet glass formed by down loading method, laminating the glass sheets, interposing the glass sheets between compressing plates with high flatness, and heating and slowly cooling the sheets while pressurizing. SOLUTION: The inorg. powder to be applied preferably consists of MgCO3 and/or CaCO3 and contains boron nitride. The particle size is uniform and preferably about 20 to 30 μm. The powder is uniformly applied preferably by rotating a sponge roller impregnated with a soln. in which the inorg. material is suspended along the surface of the sheet glass. The concn. of the soln. is preferably controlled to a low level so as to form a single molecular layer. Moreover, the sponge roller impregnated with water is preferably brought into contact with the sheet glass under pressure. By this flattening method of sheet glass, a succeeding polishing process can be simplified.

公开(公告)号：JPH05139766A

公开(公告)日：1993-06-08

申请号：JP30069691

申请日：1991-11-15

Applicant: HOYA CORP ,  NIPPON SHEET GLASS CO LTD

Inventor： HORIKAWA SUSUMU ,  MAEDA NOBUHIRO ,  KARIYA HIROYUKI ,  UCHIDA KAZUYA ,  ENDO SHIGEAKI ,  HOSHINO KAZUHIKO

IPC: C03B17/06

Abstract: PURPOSE:To provide the molding for producing a glass plate which can maintain the adhesion between a cladding platinum plate and a refractory body during molding of the glass plate in order to obtain the glass plate having high surface shape accuracy. CONSTITUTION:This molding has a peak part 10 to which molten glass is supplied, a refractory body 9 having a bottom end 11 where the molten glass joins to constitute the glass plate 7, broad front and rear surfaces 13 consisting of a central part 13a where the molten glass from the peak part shunts and flows down toward the bottom end and two side edges 13b adjacent to this central part and are proximity to each other at the bottom end, and two end faces 12 adjacent to the front and rear surfaces and a coating 15 of the platinum or platinum alloy covering the entire surface of the body 9. The thicknesses of the coatings of the central part, the side edges and the end face are specified to any of the following: (a) The central part is formed thicker than the end face and the side edges. (b) The central part is formed thicker than the end face and the side edges are formed at the same thickness as the thickness of the central part. (c) The central part is formed at the same thickness as the thickness of the end face and the central part is formed thicker than the side edges.