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Optical glass, preform, and optical element

A technology of optical glass and preform, applied in optical components, optics, instruments, etc., can solve the problem of residual aberration, and achieve the effect of improving transmittance and high transparency

Inactive Publication Date: 2012-07-18
OHARA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 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

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Embodiment

[0147] The composition and refractive index (n d ), Abbe number (ν d ), partial dispersion ratio (θg, F), anomalous partial dispersion (Δθg, F), wavelengths showing spectral transmittance of 70% and 5% (λ 70 , lambda 5 ) are shown in Tables 1 to 10. In addition, the following examples are for illustration purposes only, and this invention is not limited to these examples.

[0148] The glass of the embodiment (No.1~No.91) of the present invention and comparative example (No.1) are all made as follows: respectively select corresponding oxide, hydroxide, carbonate, nitrate, fluorine Compounds, hydroxides, metaphosphoric acid compounds and other high-purity raw materials commonly used in optical glass are used as raw materials for each component. According to the compositions of each embodiment and comparative example shown in Tables 1 to 10, the weight of the glass reaches 400g. Weigh in the same way, mix evenly, and then put it into a quartz crucible or platinum crucible, me...

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Abstract

Disclosed are: a Bi2O3-containing optical glass which has an extremely high partial dispersion ratio ([theta]g, F), has high transparency against visible light, and enables the reduction in sizes of elements and optical systems; and a preform produced using the optical glass. The optical glass contains a SiO2 component and / or a B2O3 component, wherein the Bi2O3 component is contained in an amount of 40.0 to 90.0 mass% inclusive in terms of an oxide content, the partial dispersion ratio ([theta]g, F) of the optical glass is 0.63 or more, the refractive index (nd) of the optical glass is 1.90 or more, and the Abbe's number ([nu]d) of the optical glass is 27 or less, and wherein the wavelength ([lambda]5) at which a 10 mm-thick sample of the optical glass has a spectral transmittance of 5% is 460 nm or shorter.

Description

technical field [0001] The present invention relates to optical glass, preform and optical element. Background technique [0002] 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. [0003] 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 that cannot be completely removed is called the secondary spectrum. Correcting the secondary spectrum requires an optical design that takes into account the movement of the g-line (435.835nm) in the blue region. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/066C03C3/062C03C3/064C03C3/068C03C3/12C03C3/14C03C3/145C03C3/15C03C3/155C03C3/16C03C3/17C03C3/19C03C3/21C03C3/253G02B1/00
CPCC03C3/068C03C3/066C03C3/14C03C3/062C03C3/064G02B1/00
Inventor 永冈敦
Owner OHARA
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