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Optical glass, preform for precision press molding and optical element using the same

A technology of optical glass and preforms, applied in optical components, optics, instruments, etc., can solve problems such as high refractive index, low-pressure molding temperature, and difficulty, and achieve high refractive index and prevent deterioration

Inactive Publication Date: 2013-09-11
ASAHI GLASS CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0014] In order to solve the above-mentioned problems, an object of the present invention is to provide an optical glass having optical properties of high refractive index and low dispersion, which has a low press-molding temperature and is not prone to defects during press-molding, and thus The glass melt at the liquidus temperature of the above-mentioned optical glass has a high viscosity

Method used

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  • Optical glass, preform for precision press molding and optical element using the same
  • Optical glass, preform for precision press molding and optical element using the same
  • Optical glass, preform for precision press molding and optical element using the same

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Embodiment

[0065]Specific embodiments of the present invention will be described below, but the present invention is not limited thereto. Here, Examples 1 to 20 are inventive examples of the present invention, and Examples 21 to 23 are comparative examples. Example 21 shows the glass composition described in Example 44 of Patent Document 1 cited in Background Art. Similarly, Example 22 shows Example 3 in Patent Document 2, and Example 23 shows Example 30 in Patent Document 3. Physical properties not described in the specification of each patent document were measured for the glass prepared by the method described in the example of the specification of each patent document by the method to be mentioned below. Incidentally, the values ​​of the respective components expressed in mol % based on oxides are shown in Tables 5 to 8. In addition, the La 2 o 3 and Y 2 o 3 The total content of is abbreviated as La+Y in the table, and "-" indicates that there is no measured value. However, in...

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Abstract

The invention relates to an optical glass, a preform for precision press molding and an optical element using the same. The present invention relates to an optical glass containing, in terms of % by weight on the basis of oxides, B2O3: 8 to 15%, La2O3: 27 to 40%, SiO2: 1 to 10%, ZnO: 13 to 20%, WO3: 9 to 17%, Ta2O5: 7 to 15%, ZrO2: 1 to 6%, Y2O3: 2 to 8%, and Bi2O3: 0 to 5%, in which the optical glass contains substantially no Li2O and Gd2O3, and the optical glass has a refractive index nd of 1.86 to 1.90 and an Abbe number vd of 35 to 40.

Description

technical field [0001] The present invention relates to an optical glass having optical properties of high refractive index and low dispersion, a preform for precision press molding using the optical glass, and an optical element using the preform. Background technique [0002] As highly sophisticated and compact digital cameras, camera-equipped mobile phones, and the like have spread, demands for light weight and miniaturization of optical systems used therein have grown rapidly. In optical systems, optical glasses having optical properties of high refractive index and low dispersion have been used. In addition, it is mainstream to manufacture such optical glass by precision press molding (hereinafter simply referred to as press molding) with high production efficiency. [0003] Currently, as an optical glass with high refractive index and low dispersion optical performance, B 2 o 3 and La 2 o 3 Glass as a main component has been widely used. For the purpose of formin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068C03C4/00G02B1/00
CPCC03C3/068C03C3/155
Inventor 萱场德克
Owner ASAHI GLASS CO LTD
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