TH53379B - Optical glass (Opital glass), molded preforms (Press-molding Preform), a process for manufacturing press molded preforms, optical elements and processes for manufacturing optical objects. - Google Patents

Abstract

DC60 (16/06/49) Low-dispersion optical glass suitable for producing quality preforms from fused glass and suitable for precise compression molding. It is a fluorophosphate glass composed of essential cationic components, P5+, AI3+, at least two members selected from Mg2+, Ca2+,Sr2+ and Ba2+ as divalent cationic components (R2+) and Li+ and contains, as % cationic charge, 10 to 45% of P5+, 5 to 30% of AI3+, 0 to 20% of Mg2+, 0 to 25% of Ca2+, 0 to 30% of Sr2+, 0 to 33% of Ba2+, 1 to 30% of Li+, 0 to 10% of Na+, 0 to 10% of K+, 0 to 5% of Y3+, and 0 to 15% of B3+, molar ratio of the amount of F' to the total amount of F' and O2', F' / (F' + O2'), is 0.25 to 0.85, optical glass with refractive index (Nd) of 1.40 to 1.58 and Abbe's number (Vd) of 67 to 90. Optical glass with low light dispersion suitable for the production of quality preforms from fused glass and suitable for precise compression molding. It is a fluorophosphate glass composed of essential cationic components, P5+, AI3+, at least two members selected from Mg2+, Ca2+,Sr2+ and Ba2+ as divalent cationic components (R2+) and Li+ and contains, as % cationic charge, 10 to 45% of P5+, 5 to 30% of AI3+, 0 to 20% of Mg2+, 0 to 25% of Ca2+, 0 to 30% of Sr2+, 0 to 33% of Ba2+, 1 to 30% of Li+, 0 to 10% of Na+, 0 to 10% of K+, 0 to 5% of Y3+, and 0 to 15% of B3+, in molar ratios of the amount of F' to the total amount of F' and O2',F'/(F' + O2'), is 0.25 to 0.85, optical glass which has refractive index (Nd) of 1.40 to 1.58 and Abbe's number (Vd) of 67 to 90.

Claims (8)

Claims (all) which will not appear on the advertisement page: 1. Optical glass, which is fluorophosphate glass. Containing The required cation components, P5 +, AI3 +, at least 2 members selected from Mg2 +, Ca2 +, Sr2 + and Ba2 + come as divalent cation components (R2 +) and Li + and are composed, by thinking As% cationic, 10 to 45% of P5 +, 5 to 30% of AI3 +, 0 to 20% of Mg2 +, 0 to 25% of Ca2 +, 0 to 30% of Sr2 +, 0 to 33% of Ba2 +, 1 to 30. % Of Li +, 0 to 10% of Na +, 0 to 10% of K +, 0 to 5% of Y3 +, and 0 to 15% of B3 +, the molar ratio of F- to total quantities of F- and O2-. , F - / (F- + O2-), 0.25 to 0.85, optical glass which (1) has a refractive index (Nd) of 1.40 to 1.58 and Abbe \ 's number (Vd) of 67. To 90 and (2) indicates the transmission (Excluding the reflection loss on the sample surface) of at least 80% above wavelength 400 nm to 2000 nm when the sample glass has Flat surfaces parallel to each other and with a millimeter thickness are prepared and light is emitted into the sample from the direction perpendicular above the surface above. Of claim 1 which includes At least 2 members of Ca2 +, Sr2 + and Ba2 + as divalent cationic components (R2 +). 3. Optical glass. Of claim 1 where all elements of Mg2 +, Ca2 +, Sr2 + and Ba2 +, which are divalent cationic components (R2 +), are at least 1% cationic. 4. Optical glass. Of claim 1 where each component of Mg2 +, Ca2 +, Sr2 + and Ba2 +, which is the divalent cationic component (R2 +), contains at least 1% cationic. 5. Optical glass Which is the fluorophosphate glass And show viscosity as 30 dP a.s at temperature 700 ° C or lower. 6. Optical glass Of claim 5, containing 1 to 30% positive charge of Li + 7. Of claim 1 or 5 for use in precise press molding 8. Pressed preforms Made of optical glass Of claim 1 or 5. 9. Preform mold press. Which is made up of fluorophosphate optical glass with Glass transition temperature of 450 ° C or lower and for use in precise press forming 1 0. Pressed preform. Of claim 8 or 9, in which all its surfaces are made On the value of glass solidification in molten state 1 1.Process for producing pressed preforms Which consists of causing the fused glass to be released from the tube Separation of pre-weighted molten glass blocks and shaping them into preforms. As described in claim 8 or 9 in the cooling process of glasses 1. 2.Process for producing pressed preforms As described in claim 11, the preform surface is removed by acid etching. After the above preform has been created 1 3.Process for producing pressed preforms As described in claim 11, the preform surface is removed by rain or polish. After the above preform has been created 1 4.Process for producing pressed preforms Which consists of creating a model of fused glass into an object that is made into glass And the preparation of glass objects Such by machine To produce a preform of claim 8 or 9 1 5. Optical objects Made of optical glass Of claim 1 or 5 1 6.Processes for the production of optical objects This includes heating and precise press molding of Claim 8 or 9 preforms or preforms produced by The process described in claim 11 or 14 1. 7.Processes for the production of optical objects As described in claim 16, the preform is put into a press mold. And such press mold and Preforms are heated simultaneously to perform precise press molding. 8.Process for the production of optical objects As described in claim 16, where the preform Which is hot after being heated Is put into a pre-heated press mold To perform precise press molding.