摘要:
An array of optical microelements is produced by press molding, at a high temperature, a transparent glass (4a) with a press mold (1) which has a molding surface formed into a shape corresponding to the optical microelement array and coated with a chemically stable thin film (2).
摘要:
A micro-shape transcription method has preparing a mold (13) having a transcription face on which a concavo-convex pattern is formed, pressing the transcription face against a base material (14) softened by heating, then forcibly separating the mold from the base material to transcribe a reverse pattern of the concavo-convex pattern to the surface of the base material, wherein when assuming a temperature for pressing the mold against the base material as T 1 (°C), a temperature for separating the mold from the base material as T 2 (°C), thermal expansion coefficients of the mold and the base material as α a and α b , and the maximum distance between the transcription center of the transcription face and the concavo-convex pattern as d (mm), the following relations (1) and (2): (1) T 1 ≥ T 2 (2) |α a - α b |·(T 1 - T 2 )·d ≤ 4 × 10 -2 are simultaneously satisfied.
摘要:
A press-molding die comprises a base material (1), an intermediate layer (2) formed on a surface of the base material and a protective layer (3) formed on the intermediate layer. The base material (1) comprises a silicon dioxide based glass or monocrystal alumina. The intermediate layer (2) comprises a material which adheres to both the base material and the protective layer and is heat resistant at high temperatures to which the die is subjected in. The protective layer (3) comprises at least one metal film selected from the group consisting of tungsten (W), platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), iridium (Ir), osmium (Os), rhenium (Re), tantalum (Ta) and alloys thereof. Methods for manufacturing the die and use of the die for press-molding glass articles are also disclosed.
摘要:
A die for press-molding an optical element with high precision comprises a base material made of a material excellent in heat resistance, heat shock resistance and mechanical strength at high temperature, an intermediate layer formed on the base material and made of a thin film excellent in grinding machinability and cutting machinability, and a surface protective layer formed on the intermediate layer and made of a metal thin film excellent in heat resistance and mechanical strength at high temperature and less reactive to a material of the optical element. Additional thin film may be inserted between the base material and the intermediate layer so as to enhance the adhesion strength between the base material and the intermediate layer.
摘要:
A micro-shape transcription method has preparing a mold (13) having a transcription face on which a concavo-convex pattern is formed, pressing the transcription face against a base material (14) softened by heating, then forcibly separating the mold from the base material to transcribe a reverse pattern of the concavo-convex pattern to the surface of the base material, wherein when assuming a temperature for pressing the mold against the base material as T 1 (°C), a temperature for separating the mold from the base material as T 2 (°C), thermal expansion coefficients of the mold and the base material as α a and α b , and the maximum distance between the transcription center of the transcription face and the concavo-convex pattern as d (mm), the following relations (1) and (2):T1 ≥ T2|αa - αb|·(T1 - T2)·d ≤ 4 × 10-2 are simultaneously satisfied.
摘要:
There is disclosed a method for press molding preforms (1a) to obtain optical articles in which each preform (1a) is prepared beforehand to have a diameter (Dp) larger than that of an optically functional area of the optical article and edges of the preform (1a) to be press mold contact with molding surfaces of a pair of molds (2a,b) outside an area of each molding surface corresponding to the optically functional area of the optical article, thereby elongating the lifetime of molds (2a,b).