Optical glass, preformed blank and optical element

A technology of optical glass and optical components, which is applied in the field of preforms, optical components and optical glass, and can solve problems such as aberration in the residual blue area

Inactive Publication Date: 2012-03-07
OHARA
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Chromatic aberration is usually corrected by combining a convex lens with low dispersion and a concave lens with high dispersi...

Method used

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  • Optical glass, preformed blank and optical element
  • Optical glass, preformed blank and optical element
  • Optical glass, preformed blank and optical element

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Embodiment Construction

[0077] The optical glass of the present invention contains SiO 2 Ingredients and from Ta 2 o 5 Composition, Nb 2 o 5 Composition, Na 2 With one or more components selected from the group consisting of O component and BaO component, the partial dispersion ratio (θg, F) ​​and Abbe number (v d ), between v d Satisfy within the range of ≤25 (-0.00160×v d +0.63460)≤(θg, F)≤(-0.00563×v d +0.75573), at v d Satisfied in the range of >25 (-0.00250×v d +0.65710)≤(θg, F)≤(-0.00340×v d +0.70000) relationship. In particular, it is preferable to contain SiO in an amount of 60.0% or less in mole percent relative to the total amount of the glass in terms of an oxide composition. 2 Composition and less than 25.0% Ta 2 o 5 Element. By using SiO 2 Ingredients and from Ta 2 o 5 Composition, Nb 2 o 5 Composition, Na 2 One or more components selected from the group consisting of O component and BaO component, and setting these contents within the specified range can make the gla...

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Abstract

The invention provides optical glass, a preformed blank using the glass and an optical element. The optical glass has a refractive index (nd) and an Abbe number (vd) within an expected range. Meanwhile, the partial chromatic dispersion rate (theta g, F) of the optical glass is small and the transparency of the visible light is improved. The optical glass comprises SiO2 components and more than one component selected from a group formed by the Ta2O5 component, Nb2O5 component, Na2O component and BaO component. A relationship is existent between the partial chromatic dispersion rate (theta g, F) and the Abbe number (vd). Specifically, when the Abbe number (vd) is no more than 25, then the partial chromatic dispersion rate (theta g, F) ranges between (-0.00160*vd plus 0.63460) and (-0.00563*vd plus 0.75573). When the Abbe number (vd) is larger than 25, the partial chromatic dispersion rate (theta g, F) then ranges between (-0.00250*vd plus 0.65710) and (-0.00340*vd plus 0.70000).

Description

technical field [0001] The present invention relates to optical glass, preform and optical element. Background technique [0002] Optical systems such as digital still or video cameras contain more or less bleeding called aberrations. The aberrations are classified into monochromatic aberrations and chromatic aberrations. In particular, chromatic aberrations strongly depend on the material properties of lenses used in the optical system. [0003] Generally, a combination of a low-dispersion convex lens and a high-dispersion concave lens is used to correct chromatic aberration, but in this combination, only the aberrations in the red and green regions can be corrected, leaving the aberration in the blue region. The aberration of this indivisible blue region is called the secondary spectrum. In order to correct the secondary spectrum, it is necessary to perform an optical design that takes into account the movement of the g-line (435.835 nm) in the blue region. At this time...

Claims

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Application Information

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IPC IPC(8): C03C3/062C03C3/064C03C3/066G02B1/00C03B11/00
Inventor 津田哲也土渊菜那
Owner OHARA
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