摘要:
Disclosed is methods of manufacturing optical elements such as optical glass lenses and to methods of manufacturing optical glass elements in which a heat softened optical glass material is press molded in a pressing mold with high precision. Optical pick up units is also disclosed and it comprises an object lens manufactured by the method. In the method, at least one of an upper mold and a lower mold having a shape such that when a glass material is in contact with the upper mold and the lower mold, a molding surface of at least one of the upper mold or the lower mold forms a closed space with a surface of the glass material. The method comprises the steps of supplying a glass material, at a temperature of less than a temperature at which the glass material exhibits a viscosity of 1011 poises, between the upper mold and the lower mold; heating the supplied glass material by thermal conduction by means of contact with the upper mold or lower mold on the side on which the space is formed; and moving at least one of the upper mold and the lower mold at an average moving rate of less than or equal to 10 mm/min at least for a distance h micrometers after the glass material becomes in contact with the upper mold and the lower mold, when a temperature of the pressing mold is at a predetermined temperature T2 within a range in which the glass material exhibits a viscosity of from 107.4 to 1010.5 poises, wherein a maximum height of the space in the direction of the moving of the movable mold is denoted as h micrometers.
摘要:
Provided is a method for producing a polishing composition capable of reducing scratches and particles of an object to be polished, after polishing. It is a method for producing a polishing composition including a step of filtering with a filtration filter a silica particle dispersion containing colloidal silica whose primary particles have an average particle diameter in a range of 1 to 100 nm, wherein the filtration filter includes diatomite cationized by use of a polyvalent amine compound having 9 to 200 cationic groups in the molecule.
摘要:
Lens aberration in an objective lens for recording and reproducing optical information, which is composed of a molded aspherical single lens, is inhibited while at the same time good lens productivity is attained. Also attained are excellent optical properties and high production efficiency in a mold processing step and a press molding step conducted to manufacture the lens. To this end there is provided an objective lens 1 having a convex aspherical surface formed at a first surface and a numerical aperture NA which satisfies the condition NA≧0.8. It is preferable to have an aspherical surface also at the second surface. A molding material that was premolded to a prescribed shape and is in a heated and softened state is press molded by using a pair of upper and lower molds having opposing molding surfaces, a molding surface shape is transferred by using a spherical molding material with a radius r and pressing the molding material between a pair of upper and lower molds, and the paraxial curvature radius R of the convex aspherical surface satisfies the following relation r/R≦1.35.
摘要:
A polyimide resin composition comprising a polyimide resin (A) and at least one 1H-tetrazole (B) selected from the group consisting of 1H-tetrazole, 5,5′-bis-1H-tetrazole, and derivatives thereof, and having an excellent rust preventing effect on copper and copper alloys.
摘要:
The present invention is to provided a trifluoro-substituted benzoic acid, an ester thereof, particularly 2,3,4-trifluoro-5-iodobenzonic acid, 2,3,4-trifluoro-5-trifluoromethylbenzonic acid, esters thereof, which are useful as a starting material for synthesizeing a quinolonecarboxylic acid compound useful as a medicine, an anti-bacterial agent or an antiviral agent, and processes for preparing these compounds and 2,4,5-trifluoro-3-iodobenzonic acid, 2,4,5-trifluoro-3-trifluoromethylbenzoic acid and esters thereof.
摘要:
A resin composition comprising an epoxy group-containing cycloolefin resin and a crosslinking agent is provided. More specifically, a resin composition comprising an epoxy group-containing thermoplastic norbornene resin obtained by introducing epoxy groups into a thermoplastic norbornene resin, and as the crosslinking agent, a curing agent for epoxy resins or a photoreactive substance is provided. The resin composition is suitable for use as an insulating material.
摘要:
A high-energy radiation-sensitive pattern-forming resist material consisting of polysilsesquioxane having no hydroxyl group in its molecule. The pattern-forming material of this invention has an improved sensitivity to high-energy radiation exposure, a high resistance to dry etching, a high resolution capability, and an improved thermal stability.
摘要:
An electronic device includes a wiring board; a semiconductor device arranged at an upper side of the wiring board with an electrically conductive member being arranged therebetween; a covering member arranged at an upper side of the semiconductor device; and a supporting member arranged at a lower side of the wiring board, the supporting member having a convex portion facing the wiring board, the supporting member being connected to the covering member and supporting the wiring board at the convex portion.
摘要:
A measuring method of a battery includes the step of measuring frequency characteristics of an internal impedance of the battery by an AC impedance method, and determining a parameter of an element representing ease of mobility of charges on a surface of a positive electrode of the battery and that of an element representing the ease of mobility of charges on the surface of a negative electrode.
摘要:
An electronic device includes a circuit board having a first electrode formed on a main surface thereof, a semiconductor device disposed toward the main surface of the circuit board, the semiconductor device having a second electrode formed on a surface thereof opposed to the main surface, and a connection member electrically connecting between the first and second electrodes. The connection member includes a hollow cylindrical member and a conductive member disposed within the hollow cylindrical member.