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Optical glass, preform, and optical element

A technology of optical glass and optical components, applied in optical components, optics, instruments, etc., can solve problems such as aberrations remaining

Active Publication Date: 2016-09-21
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Generally, chromatic aberration is corrected by combining a low-dispersion convex lens and a high-dispersion concave lens, but only the aberrations in the red and green regions can be corrected with this combination, and the aberrations in the blue region will remain

Method used

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  • Optical glass, preform, and optical element
  • Optical glass, preform, and optical element
  • Optical glass, preform, and optical element

Examples

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Embodiment

[0326] Examples of the present invention (No.A1~No.A13, No.B1~No.B23, No.C1~No.C6, No.D1~No.D36) and comparative examples (No.a1, No.c1, No.d1) composition and their glass refractive index (n d ) and Abbe number (ν d ), partial dispersion ratio (θg, F), glass transition temperature (Tg), wavelength at 80% transmittance (λ 80 ), the wavelength when the transmittance is 5% (λ 5 ) and liquidus temperature are shown in Tables 1 to 11. In addition, the following examples are for the purpose of illustration only, and this invention is not limited only to these examples.

[0327] The optical glass of the embodiment (No.A1~No.A13, No.B1~No.B23, No.C1~No.C6, No.D1~No.D36) of the present invention and comparative example (No.a1, No. .c1, No.d1) glass are produced as follows: as the raw material of each component, respectively select the corresponding oxide, hydroxide, carbonate, nitrate, fluoride, hydroxide, metaphosphoric acid compound, etc. The high-purity raw materials used in o...

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Abstract

The invention provides optical glass, a preform, and an optical element. The optical glass, with respect to the total glass mass formed from oxide conversion, contains, in percentage by mass, 5.0%-55.0% of a B2O3 component, 5.0%-55.0% of an La2O3 component and 2.09%-20.0% of a Y2O3 component, the mass total F+ Bi2O3+TiO2+WO3+Nb2O5+K2O being 8.0%-60.0%, contains, with respect to the incremental mass% of the oxide-based total glass mass, 5.0%-30.0% of an F component, has a refractivity (nd) above 1.70 and an Abbe number (nud) above 39, and has a partial dispersion ratio (theta g, F) which satisfies the relationship with the Abbe number (nud): (theta g, F)>=(-0.00170*nud+0.63750) or (theta g, F)>=(-2.0*10 -3 *nud+0.6498).

Description

[0001] This application is a divisional application of the application dated July 26, 2011, the application number is 201110210679.3, and the invention name is "optical glass, preform and optical element". technical field [0002] The present invention relates to optical glasses, preforms and optical elements. Background technique [0003] The optical systems of digital cameras, video cameras, etc., all have bleeding called aberration, although the degree varies. This aberration is classified into monochromatic aberration and chromatic aberration, and especially chromatic aberration strongly depends on the material properties of lenses used in the optical system. [0004] Generally, chromatic aberrations are corrected by combining a low-dispersion convex lens and a high-dispersion concave lens, but only the aberrations in the red and green regions can be corrected with this combination, and the aberrations in the blue region will remain. This aberration in the blue region t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068G02B1/00
CPCC03C3/064C03C3/066C03C3/068C03C3/14C03C3/145C03C3/15C03C3/155C03C3/19C03C3/21C03C3/23C03C3/247G02B1/00G02B1/002
Inventor 荻野道子上原进
Owner OHARA
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