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Optical glass and optical element with low conversion temperature

A technology of optical glass and transition temperature, applied in optical components, optics, instruments, etc., can solve problems such as high cost, high temperature, and damage to pressing molds

Inactive Publication Date: 2015-03-25
LIUZHOU CHUANGYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high transition temperature of the glass material, the temperature required for precision molding is high, and the molding die is easily damaged, resulting in high cost

Method used

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  • Optical glass and optical element with low conversion temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Optical glass containing: 28 wt% of P 2 o 5 ; 10wt% Al 2 o 3 ;8 wt% B 2 o 3 ; 15wt% BaO; 4wt% WO 3 ; 8wt% ZnO; 8wt% Nb 2 o 5 ;5 wt% Li 2 O; 8 wt% La 2 o 3 ; 6 wt% Gd 2 o 3 .

[0075] The main performance parameters are:

[0076] Refractive index: nd=1.6225

[0077] Abbe number: vd=57.2

[0078] Transition temperature: Tg=585℃

[0079] Softening temperature: Ts=621℃

[0080] lambda 80 : 362nm

[0081] The percentages of optical glass components and corresponding properties provided in Examples 2-7 are shown in Table 1.

[0082] Table 1 Component percentages and corresponding properties of the optical glasses provided in Examples 2-7

[0083]

[0084] Weigh the raw materials corresponding to the components shown in the above optical glass in proportion, mix them thoroughly, melt, clarify, homogenize them in a furnace with continuous melting pool, lower the temperature, inject them into a preheated metal mold, and anneal to obtain optical glass.

[...

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Abstract

The invention provides a piece of optical glass and an optical element with low conversion temperature. The optical glass is prepared from the following components: P2O5, Al2O3, B2O3, BaO, WO3, ZnO, Nb2O5, Li2O, La2O3 and Gd2O3. Due to addition of P2O5, a structural network of phosphate glass is formed through a phosphorus-oxygen tetrahedron [PO4], and the glass is relatively high in chromatic dispersion coefficient and transmittance; the chemical stability of the glass is improved as B2O3 is used as a fluxing agent together with the added BaO; moreover, due to addition of BaO, the refractive index of the glass is also increased. The softening temperature of the glass can be reduced due to addition of Li2O as a strong cosolvent. The experiment result shows that the refractive index of the optical glass with the low conversion temperature is 1.60-1.65, the abbe number of the optical glass is 55-58, the conversion temperature of the glass is smaller than 600 DEG C, and the corresponding wavelength of the optical glass is smaller than 370nm when the transmittance of the optical glass is 80%.

Description

technical field [0001] The invention relates to the technical field of glass, in particular to an optical glass and an optical element with a low transition temperature. Background technique [0002] In recent years, with the increasing popularity of digital cameras, digital video cameras, camera phones, etc., the integration of equipment used in optical systems has increased and the functions have increased rapidly, so optical systems are required to have higher accuracy, lighter weight and smaller size. size of. Therefore, aspheric mirrors are widely used, and the use of aspheric components has become the mainstream of optical design. [0003] The manufacture of aspheric lenses widely uses the method of precision molding. The so-called precision molding is to mold a glass preform with a high-precision mold with a predetermined product shape under a certain temperature and pressure, so as to obtain a glass product that has a final product shape or is very close to the fin...

Claims

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Application Information

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IPC IPC(8): C03C3/21C03C4/00G02B1/00
Inventor 陈帆
Owner LIUZHOU CHUANGYU TECH