摘要:
A method of controlling an optical element manufacturing apparatus includes: heating a cavity formed of a pair of upper and lower dies to a first temperature where an optical element material softens and becomes formable by the pair of dies; heating the cavity to a second temperature where the optical element material is deformed due to a weight of the optical element material in a state of not being in contact with the upper die, the second temperature being higher than the first temperature; and pressing the pair of dies for transfer of forming surfaces of the pair of dies onto the optical element material, the forming surfaces being outside a range where a forming surface of a die has been transferred by the deformation due to the weight in the state where the optical element material is not in contact with the upper die at the second temperature.
摘要:
A glass product manufacturing method that includes a step of disposing a workpiece configured of a glass material between two mutually-opposing punches, a step of starting to apply a pulsed current to the workpiece, and a step of starting to apply pressure to the workpiece using the two punches. The glass product is obtained from the workpiece through a discharge plasma process that causes the workpiece to deform in a state where the temperature of the workpiece has been increased by the application of the pulsed current.
摘要:
This is to shed light on a glass composition suitable for a thin lens, and provide a lens (an optical component) manufactured with using the glass. A concave lens as an optical component is made of glass containing 12 to 16% of B2O3, 35 to 44% of La2O3, and 3 to 8% of ZnO, expressed as wt %. The concave lens has a thickness t1 in its center portion of 0.5 mm or less, and a ratio (W/t1) of an external diameter W with respect to the thickness t1 of 24 or more. The concave lens can be produced suitably by press forming.
摘要翻译:这是为了揭示适用于薄透镜的玻璃组合物,并提供使用该玻璃制造的透镜(光学部件)。 作为光学部件的凹透镜由含有12〜16%的B 2 O 3,35〜44%的La 2 O 3和3〜8%的ZnO的玻璃构成,以wt%表示。 凹透镜的中心部的厚度t1为0.5mm以下,外径W相对于厚度t1的比(W / t1)为24以上。 凹透镜可以通过冲压成形适当地制造。
摘要:
A preform for an optical element is provided which involves less amount of deformation of glass in molding, and readily improves lifetime of the mold. The present preform for molding an optical glass element 10 exhibits an almost circular shape having a predetermined diameter in top view, exhibits a flattened semicircular shape having a predetermined overall height in side view, has a concave face on the top surface such that the predetermined overall height is attained at approximately the central position of the aforementioned circular shape, and has a concave face so as to fit along the convex face of the top surface such that a space is provided on the bottom face. The under surface may be either a concave face or a convex face. Also, the top surface may be either a concave face or a convex face.
摘要:
A method of manufacturing optical glass elements by means of mold pressing, wherein a heat-softened glass material is press molded with a pressing mold to manufacture optical glass elements. The refractive index of the optical glass elements is precisely adjusted so that the manufactured optical glass elements exhibit predetermined refractive index.
摘要:
An approximately rectangular parallelopiped shaped optical element 100 has a substrate (base) 101, a lens 102, and an axially symmetric convex portion 103D formed in an upper surface 100U of the substrate 101. The radius of curvature of the surface of this convex portion 103D is approximately constant. The substrate 101 has an axially symmetric concave portion 101B in a bottom surface 100B of the substrate 101. A radius of curvature of the surface of this concave portion 101B is approximately constant. The concave portion 101B is filled with an optical material having a refractive index different from the substrate 101, thereby forming the lens 102. A flat portion 103E is formed around the convex portion 103D. Axes of symmetry of the convex portion 103D and the concave portion 101B are positioned on an identical straight line and are vertical with respect to the flat portions 103E and 101C.
摘要:
A method for molding a chalcogenide glass lens includes providing a mold. A preformed lens of chalcogenide glass is placed within the mold. The lens has a top surface and a bottom surface. An amount of chalcogenide glass is deposited within the mold and on the top surface of the preformed lens. The mold is heated, such that the chalcogenide glass on the top surface of the preformed lens softens, melts, and bonds to the top surface of the preformed lens. A lens surface is formed in the melted chalcogenide glass to form a molded lens which is bonded to the top surface of the preformed lens. The molded lens and preformed lens assembly is then removed from the mold.
摘要:
A method for making working mold tools for use in a compression molding process for molding optical glass elements from high temperature glasses having Tg's in the range of from about 400° C. to about 850° C. An yttria aluminosilicate glass is fabricated by traditional melting and casting processes to thereby make an amorphous base material having a minimum apparent viscosity of 1015 poise at the temperature at which the optical glass elements are to be molded. A mold preform is made from the base material. A first surface figure for the optical element to be molded with the working mold tool is defined. A second surface figure for a master mold tool and a third surface figure for the working mold tool are computed based upon the first surface figure and the coefficients of thermal expansion of the optical element, the master mold tool, and the working mold tool, the temperature at which the working mold tool is molded, and the temperature at which the optical element is to be molded. A master mold tool is then ground and polished to achieve the second surface figure. The working mold tool is then molded from the mold preform using the master mold tool.
摘要:
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.