Abstract:
An apparatus for manufacturing a glass optical element includes: a heating unit that heats a glass material; a pressurizing unit that pressurizes the glass material; a cooling unit that cools the glass material; a molding room in which the heating unit, the pressurizing unit, and the cooling unit are located; an inert-gas supplying unit that forms a plurality of flows of an inert gas within the molding room by blowing the inert gas in a plurality of directions crossing each other; and an inert-gas emitting unit that emits, from within the molding room, the inert gas supplied into the molding room by the inert-gas supplying unit.
Abstract:
Provided are a process for the production of a precision press-molded article having a high transmittance a method of treating a glass to color or decolor the glass, the process comprising heat-treating a press-molded article containing at least one selected from WO3, Nb2O5 or TiO2 in an oxidizing atmosphere to produce a glass molded article, and the method comprising heat-treating a colored glass containing at least one oxide of WO3 and Nb2O5 in an oxidizing atmosphere to decolor the glass, or heat-treating a glass containing at least one oxide selected from WO3, Nb2O5 or TiO2 in a non-oxidizing atmosphere to color the glass.
Abstract translation:提供一种制造具有高透射率的精密压制成型制品的方法,该方法包括热处理包含至少一种选自WO 3, Nb 2 O 5或TiO 2在氧化气氛中制造玻璃成形品,所述方法包括在氧化气氛中热处理含有WO 3和Nb 2 O 5的至少一种氧化物的着色玻璃,使玻璃脱色,或者热处理含有 在非氧化气氛中选自WO 3,Nb 2 O 5或TiO 2中的至少一种氧化物以使玻璃着色。
Abstract:
Provided is an optically uniform and high-quality optical glass that is free from the occurrence of striae when a precision press-molding preform is produced therefrom, and that is a fluorine-containing glass having a refractive index nd(1) wherein the refractive index nd(1) and a refractive index nd(2) are substantially equivalent to each other, said refractive index nd(2) being a refractive index of the fluorine-containing glass after the fluorine-containing glass is re-melted in a nitrogen atmosphere at 900° C. for 1 hour, cooled to its glass transition temperature and then cooled to 25° C. at a temperature decrease rate of 30° C./hour.
Abstract:
Provided is an optically uniform and high-quality optical glass that is free from the occurrence of striae when a precision press-molding preform is produced therefrom, and that is a fluorine-containing glass having a refractive index nd(1) wherein the refractive index nd(1) and a refractive index nd(2) are substantially equivalent to each other, said refractive index nd(2) being a refractive index of the fluorine-containing glass after the fluorine-containing glass is re-melted in a nitrogen atmosphere at 900° C. for 1 hour, cooled to its glass transition temperature and then cooled to 25° C. at a temperature decrease rate of 30° C./hour.
Abstract:
The present invention provides a mold for molded glass and its protection method; the protection method permits reducing gas to be generated within the mold for molded glass, thus preventing oxidation of core assembly during temperature rise of glass and protecting the core assembly; the reducing gas is formed by the reaction between oxygen and carbon-containing element in the mold; the mold comprises a core assembly, a core sleeve sleeved onto exterior of the core assembly and a reaction member, of which the reaction member made of graphite material is arranged onto exterior of the core sleeve or into the chamber of core assembly, and used to generate reducing gas from reaction with oxygen within the mold; moreover, the mold also comprises a core assembly, a core sleeve and a fixed molding ring; a carbon film is coated onto the inner side of the fixed molding ring, and the reducing gas is formed from reaction with oxygen within the mold space.
Abstract:
The present invention relates to a method of manufacturing a molded article in the form of an optical element such as a glass lens by heat-softening a glass material such as optical glass and press molding it with high precision in a pressing mold as well as an objective lens for optical picking up. The method of manufacturing comprises press-molding a molding material to make a molded articles measuring an optical property of the molded article, correcting pressing rate of at least one of the pressing molds based on the optical property thus measured, and further press-molding to make a molded article with the corrected pressing rate. A pressing device comprising a pair of pressing molds having molding surfaces processed to prescribed shape, and a means of driving one of the pair of pressing molds at a prescribed rate to press mold a molding material supplied between the pressing molds is disclosed. The device further comprises a means for detecting an optical property, a shape or a number of the molded articles and a means for controlling driving of said means of driving by correcting pressing rate of the molds based on the detected property, shape or number.
Abstract:
In a method of manufacturing a glass optical element by press-forming a glass material in a chamber by using a forming mold comprising upper and lower dies at least one of which is movable, where a surrounded space is formed between the glass material and at least one of the upper and the lower dies when the upper and the lower dies come into contact with the glass material, a pressure within the chamber is reduced before the glass material placed in the forming mold is heated to a press-forming temperature. After sealing the space as formed when the glass material is in contact with at least one of forming surfaces of the upper and the lower dies, a gas is introduced into the chamber. The glass material is heated in the gas and then press-formed under a pressing load.
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:
A optical element forming die has a die base body; and an optical surface transferring layer to form an optical surface of the optical element, the optical surface transferring layer formed by depositing an amorphous alloy having a supercooled liquid region on the die base body, wherein a plurality of projections or concavities are provided on the optical surface transferring layer so that a plurality of concavities or projections corresponding to the plurality of projections or concavities on the optical surface transferring layer are transferred and formed on the optical surface of the optical element.
Abstract:
Provided is an optical glass that has high-refractivity and high-dispersion properties and can give preforms for press-molding, which are excellent in shapability at high temperatures and suitable for precision press-molding. The optical contains, as essential components, 25 to 45 mol % of B2O3, 2 to 20 mol % of SiO2, 5 to 22 mol % of La2O3, 2 to 20 mol % of Gd2O3, 15 to 29 mol % of ZnO, 1 to 10 mol % of Li2O and 0.5 to 8 mol % of ZrO2, the optical glass having a B2O3/SiO2 molar ratio of from 2 to 5.5 and having an La2O3 and Gd2O3 total content of 12 to 24 mol % and a ZnO and Li2O total content of 25 to 30 mol %, the optical glass having a refractive index (nd) of 1.75 to 1.85 and an Abbe's number (nulld) of 40 to 55, or the optical glass contains, as essential components, B2O3, SiO2, La2O3, Gd2O3, ZnO, Li2O and ZrO2 and has a viscosity of at least 6 dPanulls at a liquidus temperature thereof, a glass transition temperature (Tg) of 600null C. or lower, a refractive index (nd) of 1.75 to 1.85 and Abbe's number (nulld) of 40 to 55.
Abstract translation:提供了具有高折射率和高分散性的光学玻璃,并且能够提供在高温下成形性优异并适用于精密加压成型的压制成形用预成型体。 光学材料作为必要成分含有25〜45摩尔%的B 2 O 3,2〜20摩尔%的SiO 2,5〜22摩尔%的La 2 O 3,2〜20摩尔%的Gd 2 O 3,15〜29摩尔%的ZnO,1〜 10mol%的Li 2 O和0.5〜8mol%的ZrO 2,光学玻璃的B 2 O 3 / SiO 2摩尔比为2〜5.5,La2O3和Gd2O3的总含量为12〜24mol%,ZnO和Li 2 O的总含量 25〜30摩尔%,光学玻璃的折射率(nd)为1.75〜1.85,阿贝数(nud)为40〜55,或者光学玻璃作为必要成分含有B 2 O 3,SiO 2,La 2 O 3,Gd 2 O 3 ,ZnO,Li 2 O和ZrO 2,并且在液相温度下具有至少6dPa.s的粘度,600℃或更低的玻璃化转变温度(Tg),1.75至1.85的折射率(nd)和Abbe's 数字(nud)为40至55。