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Optical glass, preforming material and optical element

A technology of optical glass and optical components, applied in optical components, optics, instruments, etc., can solve the problems of veining, devitrification quality, poor quality, etc.

Active Publication Date: 2011-01-05
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the glasses disclosed in Patent Documents 1 and 2 have problems of poor quality such as veining and devitrification, especially when forming a preform material with a large diameter.

Method used

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  • Optical glass, preforming material and optical element
  • Optical glass, preforming material and optical element
  • Optical glass, preforming material and optical element

Examples

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Effect test

Embodiment

[0139] The compositions of the examples (No.1-No.120) and comparative examples (No.A-E) of the present invention, and the refractive index (n d ), Abbe number (v d ), partial dispersion ratio (θg, F), glass transition point (Tg), yield point (At) and wavelengths when the spectral transmittance is displayed as 5%, 70% and 80% (λ 5 , lambda 70 and lambda 80 ) results are shown in Table 1 to Table 13. In addition, the results of the liquidus temperature and the viscosity (η) at the liquidus temperature of the examples (No.1 to No.120) and comparative examples (No.A to E) of the present invention are shown in Tables 14 to 19. It should be noted that the following examples are for illustrative purposes only, and the present invention is not limited by these examples.

[0140] For the optical glasses of the examples (No.1-No.120) of the present invention and the glasses of the comparative examples (No.A-E), oxides, hydroxides, carbonates, nitrates, Fluoride, hydroxide, metaphos...

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Abstract

The present invention provides an optical glass which refractivity (nd) and Abbe number (vd) are all located in an expectation range, has less veins and is difficult to bring devitrification, and can be used to form a great-diameter preforming material, a preforming material using the optical glass and an optical element. The optical glass, relative to a gross mass of the glass scaled based on oxide by weight percentage, contains 5.0-35.0% of B2O3, 15.0-50.0% of La2O3, less than 10.0% of Rn2O (Rn is selected from more than one of Li, Na, K) AND 1.0-15.0% of WO3.

Description

technical field [0001] The invention relates to optical glass, preformed material and optical element with low glass transition temperature (Tg), high refraction and high dispersion. Background technique [0002] In recent years, with the rapid development of digital and high-definition instruments using optical systems, various optical instruments such as photographic equipment such as digital cameras and video cameras, image reproduction (projection) instruments such as projectors and projection TVs, etc. In the field, the requirements for reducing the number of optical elements such as lenses and prisms used in the optical system, and reducing the overall weight and miniaturization of the optical system are also getting higher and higher. [0003] Especially in the optical glass used for making optical elements, the glass with a refractive index of 1.75 or more (n d ), with an Abbe number between 30 and 50 (v d ), the requirements for high-refractive-index low-dispersio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/15C03C3/155C03C3/068C03C3/253G02B1/00
CPCC03C3/068G02B1/00C03C3/066C03C4/00
Inventor 桃野净行上原进
Owner OHARA
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