Hoya Corporation

Hoya Glass Works, Ltd.

Hiroji Sagara

Tetsuro Izumitani

Yoichi Hachitani

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.

Process for the production of spacered substrate for use in

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.

Tellurite glass

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.

Glass for eye glass lens

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,

Glass for multi-focal eyeglass lens

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,

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,

Optical glass

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.

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:

Glass compositions for ophthalmic lenses

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.

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Tokyo, Japan

Hiroji Sagara