摘要:
A method for manufacturing a glass substrate for a magnetic disk involving press-molding a heated glass material in an inside space of a molding die comprising a pair of dies, each having a predetermined processing plane, and a barrel die for slidably guiding the dies while forming an outer circumference of the glass material joined to both principal surfaces corresponding to the dies as a molding-free face, cooling the press-molded glass substrate and forming a predetermined through-hole in a central portion of the glass substrate.
摘要:
An aspherical lens, which is to be used as an objective lens for an optical pickup of an optical disc apparatus, has at least one optical functional surface of the lens formed to be rotationally asymmetric so as to generate astigmatism of axial wavefront aberration for cancelling off-axis astigmatism. The lens is manufactured by press molding an optical material such as glass or resin. At least one of the dies is formed by etching a rotationally symmetric surface of a base material, unevenly. Thereby, the etched surface becomes rotationally asymmetrically aspherical in shape.
摘要:
A die for press-molding glass optical elements which can press-mold glass optical elements having high melting points and various shapes repeatedly, which includes a base material having high strength on which a cutting layer having heat resistance and free cutting machinability is formed. After cutting the cutting layer into the desired shape with high accuracy, the die is coated with a surface protective film.
摘要:
A die for press-molding glass optical elements which can press-mold glass optical elements having high melting points and various shapes repeatedly, which includes a base material having high strength on which a cutting layer having heat resistance and free cutting machinability is formed. After cutting the cutting layer into the desired shape with high accuracy, the die is coated with a surface protective film.
摘要:
A method of press-molding glass optical elements by press-molding glass, having a high melting point, at a temperature of 650.degree. C. and higher using a die for press-molding glass optical elements which includes a base material having a heat resistance and sufficient strength to withstand press-molding of optical glass elements, a cutting layer on the base material, and a surface protective layer on the cutting layer. The cutting layer is formed of an alloy film containing P and one metal selected from the group Ni, Co, and Fe, and one metal from the group Si, Ti, Cu, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W, Re, Os, and Ir, or an alloy film containing Cu and 20 to 80 atom % of one metal selected from the group Ni, Co, Fe, Si, Ti, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W, Re, Os, and Ir, or an alloy film containing Si and 20 to 80 atom % of one metal selected from the group Ni, Co, Fe, Cu, Ti, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W, Re, Os, and Ir. The surface protective layer is formed of an alloy film of at least one metal selected from the group Pt, Pd, Ir, Rh, Os, Ru, Re, W, and Ta.
摘要:
A die for press-molding glass optical elements comprising (a) a base material having heat resistance and sufficient strength to withstand press-molding of optical glass elements; (b) a film on said base material comprising an alloy film containing B and one metal selected from the group consisting of Ni, Co, and Fe, and one metal selected from the group consisting of Si, Ti, Cu, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W, Re, Os, and Ir, to form a cutting layer; and (c) a surface protective layer on top of said cutting layer made of an alloy film comprising at least one metal selected from the group consisting of Pt, Pd, Ir, Rh, Os, Ru, Re, W, and Ta.
摘要:
A method for press molding preforms to obtain optical articles in which each preform is prepared beforehand to have a diameter larger than that of an optically functional area of the optical article and edges of the preform to be press mold contact with molding surfaces of a pair of molds outside an area of each molding surface corresponding to the optically functional area of the optical article, thereby elongating the lifetime of molds.
摘要:
A fusion welding method includes the steps of: generating a hybrid laser beam obtained by mixing a low-intensity laser beam with a first high-intensity laser beam and a second high-intensity laser beam; moving the hybrid laser beam along a gap between a first member and a second member; and melting the first member and the second member in the periphery of the gap with the hybrid laser beam, and filling the gap with the melt of the first member and the melt of the second member to weld the first member and the second member, wherein the first high-intensity laser beam is applied to the area of the first member to which the low-intensity laser beam is applied, and the second high-intensity laser beam is applied to the area of the second member to which the low-intensity laser beam is applied.
摘要:
A method is provided for manufacturing a high-precision mold whereby a feature matching a desired feature design is carved into a hard mold material (41) using, for example, a diamond grinding wheel and/or a diamond turning point. Inherent imprecision and errors (49) introduced by the use of the grinding wheel/turning point are measured to determine deviations from the desired feature design. An ultrafast shortpulse laser is then activated to desirably ablate the deviations, thereby correcting the errors and conforming the feature to the desired shape. Furthermore, a thin film (1602) may be formed over the feature either prior to or after the laser ablation process, where the error measurement and laser ablation processes detects and ablates errors on the surface of the thin film, respectively. Additionally, the laser ablation process may be applied directly to, for example, an optical lens (1400) formed from an imprecise mold to remove any errors and imperfections thereon.
摘要:
A fusion welding method includes the steps of: generating a hybrid laser beam obtained by mixing a low-intensity laser beam with a first high-intensity laser beam and a second high-intensity laser beam; moving the hybrid laser beam along a gap between a first member and a second member; and melting the first member and the second member in the periphery of the gap with the hybrid laser beam, and filling the gap with the melt of the first member and the melt of the second member to weld the first member and the second member, wherein the first high-intensity laser beam is applied to the area of the first member to which the low-intensity laser beam is applied, and the second high-intensity laser beam is applied to the area of the second member to which the low-intensity laser beam is applied.