The present invention relates to a glass in which: the glass is a crystallized glass; the glass has a difference log η−log η.sub.0 (dPa.Math.s) between a logarithm log η (dPa.Math.s) of bulk viscosity η (dPa.Math.s) and a logarithm log η.sub.0 (dPa.Math.s) of local viscosity η.sub.0 (dPa.Math.s) of larger than 0 and 1.8 or smaller, in a temperature range in which the logarithm log η.sub.0 (dPa.Math.s) of the bulk viscosity η (dPa.Math.s) is 11.4 or larger and 12.7 or smaller.

A cooling frame for a bent glass sheet, includes a support track for the sheet and a removable bearing piece that is able, in a bearing position and during cooling of the sheet by air blowing, to bear on the top face of the sheet and at the periphery thereof. The bent sheet cooled on the cooling frame maintains contact with the frame during the cooling operation and its shape complies better with that which is desired.

A cooling frame for a bent glass sheet, includes a support track for the sheet and a removable bearing piece that is able, in a bearing position and during cooling of the sheet by air blowing, to bear on the top face of the sheet and at the periphery thereof. The bent sheet cooled on the cooling frame maintains contact with the frame during the cooling operation and its shape complies better with that which is desired.

A apparatus for molding curved glass comprises: a plurality of mold units formed in a chamber for thermomolding and including a lower mold which has one or more cavities such that each of the cavities is injected with glass and an upper mold corresponding to the shape of glass to be processed and arranged on the upper side of the lower mold; and first and second processing apparatuses respectively including an inlet part for the plurality of mold units which are put, a preheating part for increasing the temperature of the glass, a molding part for molding the glass, a cooling part for cooling the molded glass and an outlet part for discharging the cooled glass, wherein the molding part can gradually decrease the increase rate of the heat applied to the plurality of mold units from the inlet part side to the cooling part side.

A curved cover glass includes a plate-like glass body having a first surface, a second surface facing the first surface and at least one end face. The plate-like glass body has an average thickness of 5 mm or less. Among tangential directions on the first surface at an arbitrary point, when an X-axis is assumed to be a direction in which a first curvature radius R.sub.1 in cross-section of the first surface in an XZ plane is minimum, the first surface has a curvature part in which the surface is bent in the X-axis direction at least at one point on the first surface. The first curvature radius R.sub.1 is 10,000 mm or less. The curvature part includes at least one opening or concave part extending from the first surface to the second surface.

A forming method for curved glass has been provided. The method comprises: placing a flat glass plate in a pattern die, and placing the pattern die in a forming apparatus; and subjecting the pattern die successively to staged heating, staged forming and staged cooling, so as to obtain the curved glass, wherein the staged heating is performed over stages which are different from each other in temperature, the staged forming is performed over stages which are different from each other in temperature, and during at least one of the stages, a varying pressure which varies from low pressure to high pressure is applied to the pattern die, the staged cooling is performed by cooling the glass plate in the pattern die over stages which are different from each other in temperature. The glass product could be used as front and rear covers of electronic products including notebook computers, mobile phones, tablet computers and smart watches.

A manufacturing method for a laminated glass in which a plurality of glass plates are laminated, includes a first main forming step of heating a first glass plate to a first softening point or higher to perform a main forming; a second main forming step of heating a second glass plate to a second softening point or higher to perform the main forming; a first finish forming step of bending and forming the first glass plate into a desired shape; and a second finish forming step of bending and forming the second glass plate into a desired shape. The first and second main forming steps are performed by using a same forming die. A first condition for lowering a temperature of the first glass plate to below the first softening point and a second condition for the second glass plate are different from each other.

A manufacturing method for a laminated glass in which a plurality of glass plates are laminated, includes a first main forming step of heating a first glass plate to a first softening point or higher to perform a main forming; a second main forming step of heating a second glass plate to a second softening point or higher to perform the main forming; a first finish forming step of bending and forming the first glass plate into a desired shape; and a second finish forming step of bending and forming the second glass plate into a desired shape. The first and second main forming steps are performed by using a same forming die. A first condition for lowering a temperature of the first glass plate to below the first softening point and a second condition for the second glass plate are different from each other.

A plate-like glass includes a chemically strengthened glass having a first surface, a second surface facing the first surface, and an end surface connecting the first surface and second surface. When a tangential direction from an arbitrary point on the first surface is assumed to be an X-axis, a direction orthogonal to the X-axis is assumed to be a Y-axis, and a direction orthogonal to the X-axis and the Y-axis is assumed to be a Z-axis, the X-axis is a direction in which a first curvature radius R.sub.1 in cross-section of the first surface in an XZ plane passing the X-axis and Z-axis is minimum. The first surface has a curvature part in which the surface is bent in the X-axis direction on the first surface and the first curvature radius R.sub.1 is within a specific range.

A glass bending device is presented. The glass bending device includes a bending chamber, a tool for holding at least one glass pane by means of a suction effect, including a downward-directed frame-like, convex contact surface and a cover with a peripheral air-guiding plate surrounding the contact surface at least in regions. The tool is suitable for sweeping the edge of the glass pane at least in sections with an air flow and thereby pressing the glass pane against the contact surface. The glass bending device further includes a fan, which is connected to the bending chamber via a feed line and a return line and is suitable for extracting air from the bending chamber via the tool and the feed line to produce the air flow and for returning air back into the bending chamber via the return line. The return line is connected to the bending chamber above the tool.