Abstract: A method for fabricating a glass component including a component main body with a primary face as a molding face and a standing wall which is molded to extend from the peripheral part of the primary face includes a drop step, a press step, and a working step. In the press step, by the filling with the molten glass, an inner wall face of the standing wall and the primary face are molded with the upper die, an outer wall face of the standing wall and a rear face of the primary face are molded with the lower die, the working part is set in the rear face side of the primary face, and in the working step, the working part is ground or polished from the rear face side of the primary face.

Abstract: Method of manufacturing cover glass plate includes drop step, press step and processing step. In the drop step, molten glass is dropped onto lower mold. In the press step, the molten glass on the lower mold is pressed with upper mold having concave portion so as to fill the concave portion of the upper mold with the molten glass and furthermore, the concave portion is overlapped to area between the upper mold and the lower mold so as to form preform formed with molded main body having first surface to which the shape of the concave portion of the upper mold is transferred and overlap portion having second surface which is portion other than the molded main body and to which the shape of the lower mold is transferred. In the processing step, all the overlap portion is removed from the preform.

Abstract: A mold for use in production of a glass optical element includes an upper mold and a lower mold on which a molten glass is dropped, the lower mold being provided with a molding surface for press molding the molten glass with the upper mold. A recess for forming a positioning protrusion on the glass optical element is provided at an outer side of the molding surface. An inclined section is provided at an inner circumferential surface of the recess closer to the molding surface. The inclined section is inclined such that, when the molten glass dropped on the molding surface spreads toward the outer side, the molten glass enters the recess while maintaining contact with the inclined section.

Abstract: A method for manufacturing a glass optical element includes the steps of: feeding molten glass onto a lower mold part; and compression-molding the molten glass using an upper mold part and the lower mold part. The upper mold part is provided with a recess for forming a positioning protrusion of the glass optical element. A surface of the recess includes a first region where a protective film against the molten glass is formed, and a second region where the protective film is not formed and the upper mold part is exposed. In the step of compression-molding the molten glass, after the molten glass enters the recess, the molten glass is compression-molded in a state where a part of the molten glass and the second region do not contact each other, to thereby form the positioning protrusion of the glass optical element.

Abstract: A molten glass dropping nozzle including: a molten glass flow path therein for flowing molten glass; and a plurality of openings of the flow path, the plurality of openings being provided on a front end of the molten glass dropping nozzle, wherein the molten glass flowing out of the plurality of openings is stored in the front end and falls as one molten glass drop.

Abstract: Provided is an aspheric lens manufacturing method by which an aspheric lens having a desired shape can be manufactured with high accuracy regardless of the shape of a glass molding without reducing productivity. The aspheric lens manufacturing method for forming the aspheric lens by pressing and machining a glass material includes a pressing step for pressing the glass material to thereby form the aspheric surface, the flat surface of the peripheral portion of the aspheric surface, and the side surface continuous to the flat surface at the same time and form the glass molding, a mounting step for mounting the glass molding in a work holder which holds and positions the glass molding by being in contact with the flat surface and the side surface of the glass molding formed in the pressing step, and a machining step for machining an other surface of the glass molding mounted in the work holder in the mounting step to thereby form the other surface into a predetermined surface shape.

Abstract: A glass optical element including: a first surface which is formed by transcription of the first transfer surface of the molding die; a second surface which is formed by transcription of the second transfer surface of the molding die and is facing the first surface; and a side surface of the outer periphery formed by transcription of the side transfer surface of the molding die; wherein the glass optical element is characterized by further containing: a first free surface which is formed without contacting with any of the surfaces of the molding die and is connecting the first surface and the side surface of the outer periphery; and a second free surface which is formed without contacting with any of the surfaces of the molding die and is connecting the aforementioned second surface and the side surface of the outer periphery.

Abstract: A molten glass dropping nozzle including: a molten glass flow path therein for flowing molten glass; and a plurality of openings of the flow path, the plurality of openings being provided on a front end of the molten glass dropping nozzle, wherein the molten glass flowing out of the plurality of openings is stored in the front end and falls as one molten glass drop.

Abstract: A glass optical element including: a first surface which is formed by transcription of the first transfer surface of the molding die; a second surface which is formed by transcription of the second transfer surface of the molding die and is facing the first surface; and a side surface of the outer periphery formed by transcription of the side transfer surface of the molding die; wherein the glass optical element is characterized by further containing: a first free surface which is formed without contacting with any of the surfaces of the molding die and is connecting the first surface and the side surface of the outer periphery; and a second free surface which is formed without contacting with any of the surfaces of the molding die and is connecting the aforementioned second surface and the side surface of the outer periphery.

Abstract: A method for forming an optical glass element by pressure molding a glass pre-form using top and bottom molds, has steps of heating a glass pre-form held at a position separated from the top and bottom molds by a holding member within the top and bottom molds, pressing the glass pre-form while the glass pre-form is held by the holding member, and moving the bottom mold independently in an upward direction and pressing the glass pre-form again.

Abstract: A method for forming an optical glass element by pressure molding a glass pre-form using top and bottom molds, has steps of heating a glass pre-form held at a position separated from the top and bottom molds by a holding member within the top and bottom molds, pressing the glass pre-form while the glass pre-form is held by the holding member, and moving the bottom mold independently in an upward direction and pressing the glass pre-form again.

Abstract: A method of molding a glass element in which a glass material is heated and then press-molded between an upper mold and a lower mold when a temperature of the heated glass material reaches a predetermined temperature. A first cooling of the glass element is performed with the glass element in contact with the pair of molds until a temperature of the glass element is within a range of .+-.20.degree. C. of a glass transition point of the glass material while a pressure applied to the glass element by the upper and lower molds is gradually reduced until the pressure becomes 0 kg/cm.sup.2. Subsequently, a second cooling of the glass element is performed without the upper and lower molds contacting the patterned surface on the glass element. The upper mold has a bottom surface and a sidewall surface with a lowermost end portion of the side wall surface, adjacent the bottom surface, being inclined with respect to a central axis of the upper mold.

Abstract: A glass gob production device for producing a glass gob from molten glass. The glass gob production device has a crucible which accommodates molten glass, a nozzle one end of which is connected to the crucible and from the other end of which the molten glass in the crucible is discharged, and a support member opposite to the other end of nozzle and having an indentation on the surface thereof for receiving and retaining the discharged molten glass in the indentation to form a glass gob. The indentation of the support member has a bottom surface and a reference surface extending in a direction perpendicular to the circumference of the bottom surface.