Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a mold for forming a glass element, whereby mold life can be extended by eliminating occurrence of selective etching etc. based on crystal plane orientation and increasing number of recycle. SOLUTION: On reference planes SS formed on CVD-SiC layers 22 and 32, extremely thin SiC interlayers 23 and 33, respectively, are formed by a PVD method so as to form films showing no deviation from stoichiometry and having markedly increased resistance to solutions such as acid/alkali. A PVD method enables film formation at a temperature lower than that in a CVD method, results in no growth of crystal grains and eliminates occurrence of selective etching of particular crystal planes. Since SiC interlayers 23 and 33 are formed after precision processing of the CVD-SiC layers 22 and 32, the degree of freedom of film-forming of the lower CVD-SiC layers 22 and 32 can be increased. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a glass lens capable of preventing its flange part from being reduced in strength and preventing generation of stray light due to incidence of unnecessary light onto the boundary between a lens part and the flange part.SOLUTION: An odd-shaped stray-light suppression part 104 located at the boundary between the central main part 100a and the peripheral flange part 100b in the glass lens 100 blocks the unnecessary incident light into the boundary or turns the light away from the optical path. The unnecessary incident light into the boundary is thus prevented, and generation of the stray light that causes noise is prevented, while reduction in the strength of the flange part 100b is prevented.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a mold for molding an optical element which can shorten a molding cycle time while having durability and can accurately mold the optical element, the optical element molding mold manufactured by the method, and the optical element molded by the mold. SOLUTION: By using an amorphous metal having a supercooled liquid domain extremely suitable for the creation of fine structure machining as a mold optical surface material and using a mold material with a low coefficient of thermal conductivity which is excellent in improving optical element molding transfer properties in combination with a mold substrate, a high function optical element having a fine structure in the optical surface can be molded accurately and efficiently. The optical elements can be manufactured by mass production. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a molten glass-feeding nozzle capable of eliminating bubbles before enlarging and of preventing the accuracy deterioration of glass products or glass gob.SOLUTION: Air bubbles hardly accumulate in the tip circumference of the molten glass-feeding nozzle by providing a groove 52e for removing bubbles at the tip of a discharge part 52b of the nozzle to stabilize dropping of the molten glass. Thereby, the accuracy in the mass, shape or the like of the glass gob can be improved. In other words, the yield of glass lenses produced from the glass gob is improved and the forming accuracy thereof is improved. Further, the maintenance of the nozzle is made unnecessary by efficiently removing bubbles at the tip of the nozzle, thus reducing the production cost of the glass lens.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing glass part capable of obtaining good transcription accuracy regardless of contour while preventing generation of air accumulation between a transcription surface and a liquid preform.SOLUTION: Generation of air accumulation in molded glass lens 100 can be restrained by dividing a melt glass G in a plurality of minute drops K which form a gap Q for air to escape between transcription surface 12 and the minute drops LP landing on the transcription surface 12. On the other hand, by fusing the plurality of minute drops K together after they are dropped, it is possible to prevent the liquid preform FP from nearing a true sphere. As a result, the liquid preform FP nearly along the form of a metal mold is formed as a preform just before molding, and by pressing the liquid preform FP, glass lens 100 can easily be obtained while reducing the burden of deformation volume of the preform by molding.
Abstract:
PROBLEM TO BE SOLVED: To provide a mold for molding an optical element which is excellent in cutting properties although it is low cost and excellent in handling properties, and can improve dimensional accuracy, and to provide a method for molding the optical element, and the optical element molded thereby. SOLUTION: A molding transferring face is not directly formed on a base body 10 of the mold for molding the optical element, but a film layer of an amorphous alloy with a supercooled liquid region which has a heat resistance of ≥a glass transition temperature (Tg) of a material of the optical element+50°C, and is excellent in a performance to be cut, is formed on the base body 10. By this method, in comparison with such a conventional process that manufactures a heat-resistant material such as a cemented carbide material used for a matrix of the mold for molding the optical element of a glass mold by a cutting process, it is possible that not only accuracy of the mold can be achieved and a delivery date can be shortened, but also a fine processing such as a ring structure of a blaze shape which is impossible to be prepared by the cutting process of a heat-resistant material can be applied on the molding transferring face of the mold by cutting processing. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a molding tool for an optical element, which is excellent in cuttability and capable of enhancing dimensional accuracy, despite inexpensiveness and excellent handleability, and the optical element which is formed by using the molding tool. SOLUTION: A base surface is preformed in such a shape that a curvature of a concave part 10a as the base surface of a base body 10 is set acuter than or as acute as that of a molding transfer surface of the molding tool for the optical element to be finally formed. This brings about the merits that a sufficient film thickness can be obtained even in a region with the smallest film thickness by post-working when accumulation is performed to a degree which makes a surface shape of a film MG almost correspond to that of the molding transfer surface, and that diamond cutting and heating press molding can be properly performed. COPYRIGHT: (C)2006,JPO&NCIPI