Bifocal lens spectralite

A technology of optical glass and coke, applied in the field of bifocal sub-sheet optical glass, can solve the problems of large expansion coefficient, low expansion, water resistance and wear resistance defects of glass

Inactive Publication Date: 2009-10-07
HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A kind of SiO disclosed by Breger (U.S.) for multifocal lens 2 -B 2 o 3 -PbO-Na 2 O sub-sheet glass, however, this type of glass is only suitable for fusion with ordinary Baituo lens to make finished bifocal optical glasses
This type of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] See Table 1 for the 100Kg weight percent content of Example 1 and the corresponding weighing amount of glass raw materials.

[0080] Table 1

[0081] Oxide

[0082] Similarly, the 100Kg weight percent content of Examples 2-6 also has the same corresponding relationship with the weighed amount of glass raw materials.

[0083] Embodiment 1~6, the weight percentage content of glass component of comparative example a~d and the refractive index (nd) of the glass that manufactures thereof, Abbe's number (υ d ), expansion coefficient (α100~300), Knoop hardness (HK) and water resistance (DW) characteristics are shown in Table 2 and Table 3 respectively.

[0084] Table 2: Examples of matrix glass SJ (indicated by weight percentage)

[0085] 1

[0086] Table 3: Comparative example of matrix glass SJ (indicated by weight percentage):

[0087] a

[0088] Al 2 o 3

[0089] Table 1 Examples 1-6 not only have a low expansion coeff...

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PUM

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Abstract

The invention relates to a bifocal lens spectralite which belongs to the technical field of spectralites and mainly solves the problems of big swell factors and poor water resistance and wear resistance of the prior bifocal and optical correcting lens. The spectralite is characterized by containing the following contents according to the weight percentage: 20-50 of SiO2, 2-25 of B2O3, 25-60 of PbO, 0-10 of Al2O3, 0-10 of TiO2, 0-5 Li2O, 0-5 of Na2O, 0-5 of K2O, 0-5 of ZrO2, 0-5 of ZnO, 0-5 of CaO, 0-5 of SrO, 0-10 of BaO, 0-5 of La2O3, and 0.2-1 of Sb2O3, wherein sigma (Li2O, Na2O and K2O) is smaller than or equal to 12 percent and larger than or equal to 0; and sigma (CaO, SrO and BaO) is smaller than or equal to 15 percent and larger than or equal to 0. The bifocal lens spectralite has the optical characteristics with the refractivity (nd) of 1.59-1.71 and the abbe number (Upsilon d) of 30-43, and is particularly suitable for being melted with GBS photochromic lens glass and made into a bifocal photochromic lens. The invention is mainly used for manufacturing the bifocal lens spectralite.

Description

technical field [0001] The invention belongs to the technical field of optical glass. It specifically relates to a bifocal sub-sheet optical glass, which is suitable for fusing with GBS photochromic lens glass to make bifocal optical glasses. Background technique [0002] Ordinary optical correction lenses only help the normal vision of close objects, and do not work for longer distance vision. The result is that people who need to wear glasses while reading a book have to take off the glasses or look over the top of the glasses if they want to see anything further ahead than the book. On the other hand, people with refractive errors have to have two pairs of glasses to use alternately, and the glasses made of this bifocal optical lens made by fusing two pieces of glass with different refractive indices together can enable the wearer to Also clearly see distant and near objects. [0003] Therefore, people have developed a bifocal optical correction lens consisting of two ...

Claims

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Application Information

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IPC IPC(8): C03C3/108C03C3/072
Inventor 邓和平李克炎张卫黄少林
Owner HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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