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Optical glass and lens using the same

An optical glass, quality technology, applied in optics, optical components, instruments, etc., can solve the problems of short durability life of forming molds, high forming temperature, low productivity, etc., achieve excellent molding formability, reduce the percentage of unqualified , the effect of small difference in thermal expansion coefficient

Inactive Publication Date: 2009-06-24
AGC INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such glass generally has a high molding temperature, so there are problems that the precious metal protective film formed on the WC type mold base has a short life, and the forming mold has a short durability life, and the glass requires prolonged molding. cycle, which results in low productivity
However, there is a problem that such glass is easily devitrified during high-temperature forming processing because it contains a large amount such as La 2 o 3 rare earth elements
However, the balance between optical properties, formability and low thermal expansion of this glass is still insufficient

Method used

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  • Optical glass and lens using the same

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Embodiment

[0064] Embodiments of the present invention will be described below by citing Examples (Examples 1 to 27) and Comparative Examples (Comparative Examples 28 to 32) according to the present invention. However, the present invention should not be construed as being limited thereto.

[0065] As for the raw material preparation method, the raw materials shown below were mixed to obtain glasses having the respective compositions shown in Table 1. The mixture was placed in a crucible made of platinum, and melted at 1,100 to 1,300° C. for 1 hour. In this operation, the contents were stirred with a platinum stirrer for 0.5 hours to homogenize the molten glass. The homogenized molten glass is poured and formed into a plate. Thereafter, place the plate at T g The temperature was maintained at +10°C for 4 hours, and then gradually cooled to room temperature at a cooling rate of -1°C / min. In the table, each part indicated by "-" indicates that the component is not present.

[0066] Th...

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Abstract

Disclosed is an optical glass which comprises the following components (% by mass in terms of an oxide): B2O3: 13-27%; La2O3: 20-35%; Gd2O3: 5-25%; ZnO: 5-20%; Li2O: 0.5-3%; Ta2O5: 0.5-15%; and WO3: 0.5-10%, and which has a mass-based ratio between the total amount of SiO2 and B2O3 and the total amount of ZnO and Li2O (i.e., a (SiO2+B2O3) / (ZnO+Li2O) ratio) of 1.35 to 1.65. Also disclosed is a lens comprising the optical glass.

Description

technical field [0001] The present invention relates to an optical glass with high refractive index and low dispersion and a lens using the glass. Background technique [0002] With the recent spread of high-resolution compact digital cameras, camera-equipped mobile phones, etc., there is a rapidly increasing demand for weight and size reduction in optical systems. In order to meet the demand, an optical design using an aspherical lens made of high-functional glass has been mainly adopted. In particular, large-diameter aspheric lenses made of glass having a high refractive index and low dispersion have become important in optical design. [0003] So far, including B 2 o 3 and La 2 o 3 Glass, which is a main component, has been known as a glass having a high refractive index and showing low dispersion. However, such glass generally has a high molding temperature, so there are problems that the precious metal protective film formed on the WC type mold base has a short li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068G02B1/00C03C3/155
CPCC03C3/155C03C3/068C03C3/14C03C3/15G02B1/00
Inventor 笹井淳杉本直树
Owner AGC INC
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