Abstract:
Plurality of glass droplets are simultaneously dropped toward center of a regular polygon of each unit on a first transfer surface of a first forming die where a plurality of the units is regularly arranged along the same plane, taking, as one unit, three or more first optical transfer surfaces for forming a lens portion placed in such a manner as to overlap vertices of the regular polygon respectively. After the divided glass droplets flow on the first transfer surface, are connected to each other between adjacent units, and are formed into united glass, and before the united glass hardens completely, a second forming die including a plurality of second optical transfer surfaces corresponding respectively to the plurality of first optical transfer surfaces is pressed relatively against the united glass on the first forming die to form the united glass, and released from the dies.
Abstract:
A dispenser of gobs of molten glass for a hollow-glass forming machine includes a supporting frame and a plurality of distributor scoops carried by the supporting frame and mounted oscillating about corresponding axes of rotation. Each distributor scoop is configured for conveying a gob of molten glass to corresponding parison moulds of a hollow-glass forming machine. The dispenser includes a plurality of motors configured for operating the plurality of distributor scoops about the corresponding axes of rotation. In addition, each motor of the plurality is operatively connected for operation to at least one scoop of the plurality of distributor scoops.
Abstract:
A method for manufacturing a glass molding by using a molding device (100), the method including the steps of: supplying molten glass (82) from an outflow nozzle (12) onto an upper surface of a holding member (20), with an opening/closing portion (25) closed, and thereby forming a glass gob on an inner side of a drip pan ring (30); opening the opening/closing portion (25) after the glass gob reaches a prescribed amount, and thereby allowing the glass gob to fall; and press molding the glass gob by using a lower die (60) and an upper die (70), wherein in the step of supplying the molten glass (82) from the outflow nozzle (12) onto the upper surface of the holding member (20), a vibration generating device (40) vibrates the drip pan ring (30) at a prescribed frequency. A high-quality glass gob is formed and a high-precision glass molding is obtained.
Abstract:
As a precursor to forming a glass sheet, a soot layer is formed on a deposition surface using a roll-to-roll glass soot deposition process. A soot layer-separating device is configured to bring a stream of gas into contact with at least a portion of a free surface of the soot layer. The impinging gas stream affects local thermal expansion stresses at the soot layer/deposition surface interface, which separates the soot layer from the deposition surface.
Abstract:
A high-quality glass gob is easily obtained that is adapted to glass of recent years having higher refractive indices or lower Tg of which the molding temperature is close to or below the temperature of liquid phase. A nozzle, which is connected to a bath of molten glass to flow out the molten glass, has a site disposed where the center of gravity of a cross-section, which is perpendicular to the flow-out direction of the molten glass in the flow path within the nozzle, is shifted from the center of gravity of the cross-section of upstream side. A method for producing a glass shaped body includes steps of melting a raw material of glass within a bath of molten glass, flowing out the molten glass into a molding tool through a nozzle connected to the bath of molten glass, and molding the glass shaped body.
Abstract:
There is provided a method for electrically energizing and heating a platinum or platinum-alloy composite tube structure having a structure including a first main tube, a second main tube, and a branch tube connecting the first main tube and the second main tube, which prevents a local part of the branch tube from being electrically energized and heated in an excessive or insufficient manner. There is provided a method for electrically energizing and heating a platinum or platinum-alloy composite tube structure having a structure including a first main tube, a second main tube, and a branch tube connecting the first main tube and the second main tube, the method comprising dividing an energizing path for the branch tube into a first energizing path from the first main tube to the branch tube and a second energizing path from the branch tube to the second main tube; and performing energization control for the first energizing path and energization control for the second energizing path independently of each other.
Abstract:
An object of the invention is to provide a process for producing a synthetic quartz glass while taking account of a refractive index distribution remaining in the synthetic quartz glass; a jig for use in the synthetic-quartz-glass production process; and a synthetic quartz glass for an optical member, produced by the process. A process for producing a synthetic quartz glass, which comprises: depositing and growing fine quartz glass particles synthesized by flame hydrolysis of a glass-forming material on a rotating target to thereby form a porous quartz glass base of a substantially cylindrical shape; presintering the porous quartz glass base; and heating the presintered porous quartz glass base to a temperature not lower than the vitrification temperature to convert the base into a transparent glass, wherein in the step of conversion into a transparent glass, the porous quartz glass base is placed so as to make its growth axis vertical and a load is vertically imposed on the thus-placed porous quartz glass base.
Abstract:
A mold for glass has a base and a diamond protective film deposited on the base. Due to the quality of the diamond protective film, the base can be protected substantially with a high temperature in the process of manufacturing the glass to extend the lifespan of the mold.
Abstract:
Disclosed are refractory body and refractory vessel for reforming or reflowing glass materials. The refractory body and vessel have gas venting channels, including surface grooves and/or vias formed on the surface in contact with the glass during high temperature treatment thereof. The refractory body and vessel are particularly advantageous for reflowing fused silica glass at an elevated temperature such as above 1700° C.
Abstract:
A gob distributor for distributing gobs of molten glass from an orifice of a glass melter feeder bowl to a plurality of delivery chutes, each of which leads to a section of a glass forming machine of the individual section type, said gob distributor including an a.c. servo motor with a vertical output shaft, a gob scoop having an inlet end positioned beneath the orifice and an outlet end positioned in alignment with one or the other of the delivery chutes, and a driven member to which the gob scoop is attached for oscillating movement of the gob scoop in an indexing manner. The driven member includes a shaft that is parallel to and spaced from the output shaft, and an endless positive drive, in the form of an endless cogged timing belt or a pair of double-ended metal chain sections joined end-to-end by adjustable length connectors, is provided to transmit torque from the output shaft of the motor and the shaft of the driven member. A lubricating oil circulating system is provided to circulate pressurized cooling oil successively through enclosed bearings that are provided to rotatably support the output shaft of the motor and the shaft of the driven member.