Optical glass, pre-form body and optical element

A technology of optical glass and glass, which is applied in the direction of optical components, optics, instruments, etc., and can solve problems such as aberration in the residual blue area

Inactive Publication Date: 2012-07-25
OHARA
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  • Abstract
  • Description
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Problems solved by technology

[0003] Usually, chromatic aberration is corrected by combining a low-dispersion convex lens and a high-dispersion concave lens, but onl

Method used

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  • Optical glass, pre-form body and optical element
  • Optical glass, pre-form body and optical element
  • Optical glass, pre-form body and optical element

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Embodiment

[0344] Composition (mass %) and refractive index (n d ), Abbe number (v d ), partial dispersion (θg, F), Knoop hardness (Hk), abrasion, and wavelength at which the spectral transmittance is 5% (λ 5 ) are shown in Tables 1 to 3. In addition, the composition (mol %) and the refractive index (n d ), Abbe number (v d ), partial dispersion (θg, F), chemical durability (acid resistance, water resistance) obtained by the powder method, and wavelength at which the spectral transmittance is 5% (λ 5 ) are shown in Table 4 to Table 6. It should be noted that the following embodiments are always for the purpose of illustration, and are not limited to these embodiments.

[0345] The glass of the embodiment of the present invention and the comparative example are produced as follows: respectively select corresponding oxides, hydroxides, carbonates, nitrates, fluorides, hydroxides, metaphosphoric acid compounds, etc. The purity raw material is used as the raw material of each component...

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Abstract

The invention provides an optical glass useful for correcting chromatic aberration of optical elements and a pre-form body using the optical glass. The optical glass satisfies the following conditions: according to components converted into oxide, the optical glass comprises Bi2O2, SiO2 and/or B2O3 and F components; a part dispersion rate [theta g,F] is more than 0.63; an abbe number [vd] is below 27; the part dispersion rate [theta g,F] is greater than -0.0131*[vd]+0.9000.

Description

technical field [0001] The present invention relates to optical glass, preform and optical element. Background technique [0002] Optical systems such as digital cameras and photographic equipment, to varying degrees, include bleeding known as aberrations. 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] Usually, chromatic aberration is corrected by combining a low-dispersion convex lens and a high-dispersion concave lens, but this combination can only correct aberrations in the red and green regions, leaving aberrations in the blue region. The aberration of the irremovable blue region is called secondary spectrum. In order to correct the secondary spectrum, it is necessary to perform an optical design that adds the movement of the g-line (435.835 nm) in the blue region. At this time, the partial dispersion rat...

Claims

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Application Information

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IPC IPC(8): C03C3/23C03C3/064C03C3/062C03C3/068C03C3/066G02B1/00
Inventor 永冈敦
Owner OHARA
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