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Optical glass and lens

An optical glass, benchmark technology, applied in optics, optical components, instruments, etc., can solve problems not including devitrification characteristics, and achieve excellent molding applicability, excellent devitrification characteristics, and reduce weight and size.

Inactive Publication Date: 2009-03-18
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these prior arts intend to provide optical glass with only excellent molding applicability, and this patent document contains no description related to devitrification characteristics during high-temperature forming process

Method used

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  • Optical glass and lens
  • Optical glass and lens
  • Optical glass and lens

Examples

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Embodiment

[0060] The present invention will now be described in more detail with reference to Examples (Examples 1-33) and Comparative Examples (Examples 34-36), but it should be understood that the present invention should not be construed as being limited thereto.

[0061] The raw materials were mixed together to obtain from B 2 o 3 to TiO 2 or Sb 2 o 3 The glass of each composition expressed in mass % in each column of . Each mixture was put into a platinum crucible and melted by heating at 1,100 to 1,300° C. for 1 hour. During this operation, the melt was stirred for 0.5 hours using a platinum stirrer to homogenize the molten glass. A uniform molten glass is poured and formed into a sheet. Thereafter, the plate glass is placed at the glass transition temperature 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.

[0062] As raw materials, special-grade boron oxide, lithium carbonate, zirconium...

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Abstract

Disclosed is an optical glass containing, in mass% in terms of oxides, 25-50% of B2O3, 5-25% of ZnO, 13-25% of La2O3, 10-28% of Gd2O3 and 1.5-4% of Li2O. The optical glass has a refractive index (nd) of 1.65-1.76, an Abbe's number (nu d) of 45-60, and a molding temperature (Tp), which is defined by the following relation expressed by the glass transition temperature (Tg) and the yield point (At): At + (At - Tg) / 2, of not more than 650 DEG C. In addition, this optical glass does not substantially contain arsenic, lead and fluorine. Also disclosed is a lens made of such an optical glass.

Description

technical field [0001] The present invention relates to optical glass and a lens using the optical glass. Background technique [0002] As a result of the spread of digital cameras and the like, there has recently been a rapid trend towards higher integration and function enhancement in devices using optical systems, and reduction in weight and size of optical systems has been increasingly desired. To realize this desire, optical designs using aspheric lenses made of high-performance glass are becoming mainstream. Usually, this glass is heated to a temperature acceptable for forming, and then formed by precision molding to produce an aspheric lens. In particular, although recently used large-aperture lenses are spherical lenses, these lenses are being replaced by larger-aperture aspherical lenses in order to further enhance functions. There is an increasing need for high performance glasses for the manufacture of these lenses to have high refractive index and low dispersio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/15G02B1/02
CPCC03C3/15C03C3/155C03C3/068G02B1/02
Inventor 笹井淳杉本直树
Owner ASAHI GLASS CO LTD