SU804583A1 - Optical glass - Google Patents

Description

The invention relates to the arbitrariness of glass, in particular glasses of the special flint type with an abnormal course of the relative partial dispersion in the blue part of the spectrum, which can be used as lenses and prisms in various optical systems and allow the construction of apochromatic large-sized lenses (lenses with fixed secondary spectrum).

Known optical glass, including mol.%: Ε> 2θ5 45-70 .: РОО 5 “30” AI ₂ 0j 5-25; Na ₂ 0 0-15; S i 0 ₂ 0-10; CaO, BaO, MgO 16 And or CdO and T10, ZrO, SbO, T 1 0, or WO - do. 3 11) and [2].

The disadvantages of this glass are low chemical resistance and a high tendency to crystallization.

Closest to the invention is optical glass, including mol.%: B ^ Oj 45-55; Si Od GB-23; POO 7-15; A1 ₂ 0 _e 9.5-I: CaO MgO. 2-6; ΖήΟ 0.5-5; la ₂ 0 _} 0.5-3 and at least one oxide from the group Ga ^ -j, CdgOg, Y2.C5, Ce0 ₂ and As ^ O 5

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The glass of the proposed composition does not crystallize in production, it is suitable for the preparation of large-block optics.

The proposed glass has high chemical resistance both to a humid atmosphere and to staining reagents and allows you to get lenses and prizes with lower processing costs, as well as high-precision surfaces of optical parts without the use of special conditions.

High chemical resistance allows to increase the dimensions of parts, which extends the range of glass and increases the reliability of devices in adverse climatic conditions, for example, in the tropics.

Claims (2)

The invention relates to the production of glass, in particular, glasses of the special flint type with an anomalous course of relative partial dispersion in the blue part of the spectrum, which can be used as a line and prisms in various optical systems and allow the construction of apochromatic large-size objectives (lenses with a corrected secondary spectrum). Optical glass is known, including the mole,%: BjOs 45-70: PbO 5-30i AljOa 5-25; NajO 0-15; S i Og 0-10; CaO, BaO, And or CdO And TJO, ZrO, SbO, T) 0, or WO - DO. 3,111 and {21. The disadvantages of this glass are low chemical resistance and a high tendency to crystallization. Closest to the invention is an optical glass comprising mol.%: S-SS; SiOa 16-23; PbO 7-15; AlaOjS.S-H: CaO MgO, 2-6; ZhO 0.5-5; l-a; jOj 0.5-3 and no-at least one oxide from the group 3 of the group Gaf ,, 0.5-2, or Nb20.5 0.1-0.37; and had a refractive index n, j -1,578-1,616. 1.616. The aim of the invention is to increase the refractive index. This goal is achieved by the fact that glass, including 820 Si O-, PbO, MgO, CaO and YjO, additionally contains, at least one component from the HfO group, and in the following ratio of components, mol%; In jO,, 8; SiOa13-15,5; AljO 11.5-15; PbO 16.25; la.O 0.5-3; MgO 2-6; CaO 2-6; 203 0, S- «And, no, at least one oxide from the group HfO ,, В |„ 0 and ybjiO j 0,1-3. tCpoMe, in order to reduce bubbling, it may additionally contain 0.5-3.5 mol% of at least one oxide from the group,, CdC, ZnO and ilap. Glass warp temperature 1200-1400 s in the usual technology. The invention is illustrated by specific examples, the data are shown in the table. The glass of the proposed composition does not crystallize in production, it is suitable for the preparation of large-block optics blanks. The proposed glass has a high chemical resistance both to a humid atmosphere, as well as to reagents smearing, and allows obtaining lenses and priming with lower processing costs, as well as high-precision surfaces of optical components without the use of special conditions. High chemical resistance allows to increase the size of parts, which expands the range of glass application and increases the reliability of devices under adverse climatic conditions, for example, in the tropics. Claims 1. Optical glass including Br. SiOa. , PHO, la-jO, SiOj .., PHO, La-jO ,, HgO, CaOi and VoO B, with the following ratio of components, mol.%: BoOj, 8; Si Od Isis, 5; AljOa it.5-15; PIO l6, o-25; l-ag, 0, 0.5-3; MgO 2-6; CaO 2-6; 2.3 0.5-4 And, at least one of the group HfOj, YbgO 0.1-3. 2. Glass POP.1, characterized in that, in order to reduce bubbling, it additionally contains 0.5-3.5 mol.%, According to: more than one oxide from the group As.O, SbjjO,, CdO, ZnO and Li20. , Sources of information taken into account in the examination 1. German patent 2262364, cl. 32 In 3/10, published. 1975. 2. USSR author's certificate according to the application No. 2593264, cl. From 03 To 3/08 1978.