Abstract: The process for the production of a spacered substrate for use in a self-emitting display, provided by the present invention, comprises the steps of exposing a photosensitive glass to light while masking a portion to form a spacer on a surface of the photosensitive glass, to form a latent image corresponding to an exposed portion, crystallizing the exposed portion having the latent image, removing a crystallized exposed portion by an etching treatment, and thereby forming a spacer of non-exposed photosensitive glass on a glass substrate. According to the present invention, there is provided a spacered substrate for use in a self-emitting display, in which the spacer has high accuracy and high heat resistance and the roughening of the substrate surface is not easily caused.

Abstract: Tellurite glass is disclosed, consisting essentially of 60 to 85 mol % of TeO.sub.2, up to 25 mol % of Li.sub.2 O, up to 35 mol % of Na.sub.2 O, up to 25 mol % of K.sub.2 O, up to 25 mol % of Rb.sub.2 O, up to 15 mol % of Cs.sub.2 O, up to 10 mol % of MgO, up to 5 mol % of CaO, up to 5 mol % of SrO, 1 to 30 mol % of BaO, up to 30 mol % of ZnO, up to 30 mol % of PbO, and up to 5 mol % in total of La.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5 and WO.sub.3 with the total content of K.sub.2 O, Rb.sub.2 O and Cs.sub.2 O being from 1 to 25 mol %, and the total content of ZnO and PbO being from 1 to 30 mol %. The tellurite glass has a reduced light path difference with temperature difference and an increased figure of merit.

Abstract: A glass for an eye glass lens comprising a SiO.sub.2 (or B.sub.2 O.sub.3)-CaO-Nb.sub.2 O.sub.5 system as a basic system and having a refractive index of 1.79 or more, an Abbe number of 32 to 38 and a specific gravity of less than 3.6 is disclosed.

Abstract: A glass for multi-focal eyeglass having a refractive index (n.sub.d) of 1.74 to 1.78, an Abbe number (.nu..sub.d) of 31 or more, a coefficient of thermal expansion of 82 to 95.times.10.sup.-7 and a softening point of 560.degree. to 640.degree. C., comprising, in % by weight,26 to 34% SiO.sub.2 +B.sub.2 O.sub.3 +Al.sub.2 O.sub.3 ;14 to 24% SiO.sub.2 ;6 to 14% B.sub.2 O.sub.3 ;0 to 4% Al.sub.2 O.sub.3 ;38 to 50% PbO;15 to 30% BaO+SrO+CaO+MgO+ZnO;2 to 24% BaO;0 to 17% SrO;0 to 15% CaO;0 to 10% MgO;0 to 12% ZnO; and0 to 3% ZrO.sub.2 ;wherein a weight ratio of B.sub.2 O.sub.3 /SiO.sub.2 ranges from 0.3 to 0.8 and a weight ratio of alkaline earth oxides/PbO ranges from 0.2 to 0.6.

Abstract: A glass for multi-focal eyeglass having a refractive index (n.sub.d) of 1.67 to 1.73, an Abbe number (.nu..sub.d) of 33 or more, a coefficient of thermal expansion of 82 to 95.times.10.sup.-7 and a softening point of 560.degree. to 640.degree. C., comprising, in % by weight,32 to 40% SiO.sub.2 +B.sub.2 O.sub.3 +Al.sub.2 O.sub.3 ;22 to 40% SiO.sub.2 ;0 to 10% B.sub.2 O.sub.3 ;0 to 4% Al.sub.2 O.sub.3 ;4 to 10% Li.sub.2 O+Na.sub.2 O+K.sub.2 O;0 to 4% Li.sub.2 O;0 to 7% Na.sub.2 O;0 to 7% K.sub.2 O;30 to 47% PbO;3 to 24% BaO+SrO+CaO+MgO+ZnO;0 to 20% BaO;0 to 15% SrO;0 to 10% CaO;0 to 8% MgO;0 to 15% ZnO; and1 to 7% ZrO.sub.2 ;wherein a weight ratio of alkali metal oxides/PbO ranges from 0.1 to 0.3.

Abstract: An optical glass having a refractive index of 1.66 to 1.77 and an Abbe number of 30 to 50 and superior chemical stability, which comprises, in % by weight,30 to 45% SiO.sub.2 ;0 to 6% B.sub.2 O.sub.3 ;1 to 5% Li.sub.2 O;0 to 4% Na.sub.2 O+K.sub.2 O;20 to 40% BaO;5 to 20% MgO+CaO+SrO+ZnO,with the proviso of0 to 15% MgO,0 to 20% CaO,0 to 20% SrO, and0 to 15% ZnO;2 to 7% ZrO.sub.2 ;2 to 20% TiO.sub.2 ; and0 to 10% La.sub.2 O.sub.3 +Ta.sub.2 O.sub.5 +Nb.sub.2 O.sub.5 +WO.sub.3,with the proviso of0 to 10% La.sub.2 O.sub.3, and0 to 4% Ta.sub.2 O.sub.5 +Nb.sub.2 O.sub.5 +WO.sub.3.

Abstract: A glass for an eye glass lens having a composition comprising, in weight percent, 36 to 50% SiO.sub.2 + Al.sub.2 O.sub.3 + B.sub.2 O.sub.3, but with 20 to 50% SiO.sub.2, 0 to 13% Al.sub.2 O.sub.3 and 0 to 20% B.sub.2 O.sub.3 ; 5 to 35% CaO + MgO, but with 5 to 35% CaO and 0 to 20% MgO; 1 to 20% Li.sub.2 O + Na.sub.2 O + K.sub.2 O, but with 0 to 15% Li.sub.2 O and 0 to 15% Na.sub.2 O + K.sub.2 O; 16 to 34% ZrO.sub.2 + TiO.sub.2 + Nb.sub.2 O.sub.5, but with 0 to 11% ZrO.sub.2, 0 to 3% TiO.sub.2 and 8 to 30% Nb.sub.2 O.sub.5 ; 0 to 15% BaO + SrO + ZnO; and 0 to 15% La.sub.2 O.sub.3 + Ta.sub.2 O.sub.5 + WO.sub.3 ; with the glass having further a refractive index and .gtoreq.1.69, an Abbe number .nu.d.gtoreq.40, and a specific gravity .ltoreq.3.2.

Abstract: A glass composition for an ophthalmic lens having a refractive index of at least 1.69, an Abbe value of at least 39 and a specific gravity of not more than 3.2 and comprising, in percent by weight:1. 42 to 52 SiO.sub.2 +Al.sub.2 O.sub.3 +B.sub.2 O.sub.3 with 20 to 42 SiO.sub.2, 5 to 13 Al.sub.2 O.sub.3 and 0 to 20 B.sub.2 O.sub.3 ;2. 22 to 39 CaO+MgO with 12 to 39 CaO and 0 to 20 MgO;3. 15 to 28 ZrO.sub.2 +TiO.sub.2 +Nb.sub.2 O.sub.5 with 0 to 7 ZrO.sub.2, 5 to 13 TiO.sub.2 and 0 to 15 Nb.sub.2 O.sub.5 ;4. 0 to 15 BaO+SrO+ZnO with 0 to 6 BaO, 0 to 10 SrO and 0 to 15 ZnO; and5. 0 to 10 La.sub.2 O.sub.3 +Ta.sub.2 O.sub.5 +WO.sub.3 with 0 to 10 La.sub.2 O.sub.3, 0 to 6 Ta.sub.2 O.sub.5 and 0 to 10 WO.sub.3.

Abstract: A thorium oxide-free B.sub.2 O.sub.3 --La.sub.2 O.sub.3 --Gd.sub.2 O.sub.3 --Ta.sub.2 O.sub.5 system optical glass is improved in stability to devitrification and in optical constants by introducing at least one of a divalent metal oxide such as ZnO, CdO, PbO, BaO, SrO, CaO, and MgO into the optical glass composition or replacing Ta.sub.2 O.sub.5 of the optical glass composition with a divalent metal oxide. If desired, the glass may be free of CdO.