摘要:
An optical fiber of germanium-free, multicomponent glasses has a core glass which has the molecular composition: SiO.sub.2 : 57.5-65%; (ZrO.sub.2 +1/2Y.sub.2 O.sub.3): 0-5%; (MgO+CaO+SrO+BaO+ZnO): 12.5-27.5 where MgO: 0-5%, CaO: 0-10%, SrO: 0-7.5%, BaO: 0-15% ZnO: 0-20%, and in which if no BaO is present, the ZnO content is 12.5-20%, and if no ZnO is present, the BaO content is 5-15%, and (Li.sub.2 O+Na.sub.2 O+K.sub.2 O): 10-25%. The core glass has a K.sub.2 O content which is preferably smaller than half of the total alkali metal oxide content. The cladding glass consists of a silicate glass or a borosilicate glass having a refractive index which is at least 2% lower than the refractive index of the core glass. The viscosity of the cladding glass at the processing temperature is 0.5 to twice the viscosity of the core glass expressed in Pa.s.
摘要翻译:无锗的多组分玻璃的光纤具有芯玻璃,其分子组成为:SiO2:57.5-65%; (ZrO 2 + 1 / 2Y 2 O 3):0-5% (MgO + CaO + SrO + BaO + ZnO):12.5-27.5其中MgO:0-5%,CaO:0-10%,SrO:0-7.5%,BaO:0-15%ZnO:0-20% 如果不存在BaO,ZnO含量为12.5〜20%,如果不存在ZnO,则BaO含量为5〜15%,(Li 2 O + Na 2 O + K 2 O):10〜25%。 核心玻璃的K 2 O含量优选小于总碱金属氧化物含量的一半。 包层玻璃由折射率比核心玻璃的折射率低至少2%的硅酸盐玻璃或硼硅酸盐玻璃组成。 包层玻璃在加工温度下的粘度是以Pa.s表示的芯玻璃的粘度的两倍。
摘要:
An optical fiber of the graded index type consisting of a glass having predominantly the composition 60-70 mole % SiO.sub.2, 15-30 mole % alkali metal oxides, and 10 to 15 mole % MgO in combination with at least one oxide selected from the group formed by CaO, SrO, BaO and ZnO. The impurity content of the fiber is less than 0.01 ppm. In the fiber the MgO content increases from the axis of the fiber to the circumference of the fiber. The oxide or the other oxides, having cations which can be exchanged for the magnesium cation, decrease to a corresponding extent in this direction.
摘要:
Grooves are etched in a glass substrate, using a metallic mask, after which the substrate is coated with a layer of glass having a refractive index which is higher than that of the substrate, the groove being filled completely. Excess glass is removed, the metallic mask being used as a stop layer and a protective layer being provided at the location of the filled grooves. Excess glass is removed at the location of the grooves by means of polishing so that a high accuracy as regards depth can be obtained.
摘要:
A new type of glass, for example for use as a TL-envelope glass which as regards phosphor poisoning and Hg penetration has better properties than the present TL-envelope glasses. Phosphor poisoning occurs in particular upon fusing electrodes and bending and severing and bridging, respectively, during the manufacture of SL and PL lamps. Phosphor poisoning is controlled by incorporating little or no Na.sub.2 O in the glass. In order to nevertheless reach good processing properties, a combination of Li.sub.2 O and K.sub.2 O is used in the glass. The addition of only Li.sub.2 O or only K.sub.2 O does not result in a suitable glass. Hg penetration is controlled by the presence of a large quantity of alkaline earth metal oxides in the glass. The glass according to the invention has a good light transmission. A lamp comprising a lamp envelope of a glass according to the invention shows only a small luminous decline during operation of the lamp.
摘要:
An optical device is manufactured by providing a disc-shaped body of a light-conducting material on a plane surface of a disc-shaped carrier body, grinding the light-conducting material mechanically to a thickness which exceeds the desired ultimate layer thickness by at least 50 .mu.m, subjecting the light-conducting material to alternate tribochemical and mechanical polishing treatments until a thickness is obtained which exceeds the desired ultimate layer thickness by approximately 10 .mu.m, and subsequently polishing the light-conductor body tribochemically until the desired layer thickness is obtained.
摘要:
Method of preparing an aluminum oxide containing quartz glass activated by bivalent europium and comprising as glass matrix oxides mainly SiO.sub.2 and furthermore per mol of SiO.sub.2 up to at most 0.15 mol of at least one of the oxides, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, P.sub.2 O.sub.5, ZrO.sub.2, Scf.sub.2 O.sub.3, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Lu.sub.2 O.sub.3, the alkali metal oxides and the alkaline earth metal oxides. A mixture is made of the composite oxides or of compounds which yield these oxides. The mixture comprises europium in the form of an aluminum containing compound of bivalent europium. The mixture is melted at a high temperature in a reducing atmosphere and is then cooled. The luminescent quartz glasses obtained are used in luminescent screens of, for example, low-pressure mercury vapor discharge lamps.
摘要:
The method of intimately joining a hard magnetic part to a soft magnetic part in the manufacture of an electrical machine comprising polishing the joining surfaces such that the surface roughness hight is about less than or equal to two nanometers and joining the parts by direct bonding.
摘要:
An electrical machine comprises a stationary first section (1) and a second section (5) which is movable relative to the stationary section. At least one of the sections comprises a soft-magnetic part (7) and a hard-magnetic part (9). A surface (7a) of the soft-magnetic part and a surface (9a) of the hard-magnetic part are fixed intimately to one another by direct bonding.
摘要:
A component includes a substrate layer (1) of glass or Al.sub.2 O.sub.3, an anti-reaction layer (2) or a levelling layer (2), two electrode layers (3, 5) and a dielectric layer (4) as well as such a capacitor. Manufacture a component which provides for cost-effective, surface-mountable (SMD). The anti-reaction layer (2) on the glass substrate (1) or the levelling layer (2) on the Al.sub.2 O.sub.3 -substrate (1) is made of at least one specific material. An anti-reaction layer or a levelling layer (2) of one of the above-mentioned substances or a combination of several substances, enables a dielectric layer (4) to be provided by means of which a high capacitance value is achieved.
摘要翻译:组分包括玻璃或Al 2 O 3的基底层(1),抗反应层(2)或调平层(2),两个电极层(3,5)和介电层(4) 电容器。 制造成本低廉,表面贴装(SMD)的组件。 玻璃基板(1)上的抗反应层(2)或Al2O3基板(1)上的调平层(2)由至少一种特定材料制成。 上述物质之一的抗反应层或调平层(2)或几种物质的组合使得能够提供实现高电容值的介电层(4)。
摘要:
Method of providing a pattern of apertures and/or cavities in, for example, a glass duct plate of a plasma-addressed liquid crystal display, in which first a mechanical treatment is performed (for example, by means of powder blasting) and then a wet-chemical etching treatment is performed to render the walls of the ducts microscopically less rough so that the optical disturbance is reduced and the glass becomes clearer again.