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Optical glass, preform, and optical element

A technology of optical glass and optical components, applied in the direction of optical components, optics, instruments, etc., can solve the problem of aberration that will remain in the blue area, and achieve the effect of improving transparency

Active Publication Date: 2015-04-29
OHARA
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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 this combination can only correct aberrations in the red and green regions, leaving aberrations in the blue region

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

[0204] The composition and refractive index (n d ), Abbe number (ν d ), partial dispersion ratio (θg,F), spectral transmittance shown as 5% and 70% wavelength (λ 5 , lambda 70 ) are shown in Table 1 to Table 9. It should be noted that the following examples are for illustrative purposes only, and are not limited to these examples.

[0205] The glass of the embodiment of the present invention and comparative example is carried out as follows: as the raw material of each component, all select respective corresponding oxide, hydroxide, carbonate, nitrate, fluoride, hydroxide, metaphosphoric acid compound The high-purity raw materials used in ordinary optical glass are weighed and uniformly mixed in such a way as to achieve the composition ratios of the respective examples and comparative examples shown in the table, and then put into a platinum crucible according to the degree of melting difficulty of the glass composition. The ground is melted in an electric furnace at a tem...

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Abstract

Provided is an optical glass having a small Abbe number (nud), a small partial dispersion ratio (thetag, F), heightened transparency with respect to visible light, and a refractive index (nd) within a desired range. Also provided is a preform and an optical element in which the optical glass is used. The optical glass contains, in terms of mass, 5.0 to 40.0% of an B2O3 component, 15.0 to 60.0% as a sum of the mass of an Ln2O3 component (where Ln is one or more elements selected from the group consisting of La, Gd, Y, and Yb), and 0 to 50.0% of an Nb2O5 component. With respect to the Abbe number (nud), the partial dispersion ratio (thetag, F) satisfies the relationship (-0.00162 × nud + 0.63822) <= (thetag, F) <= (-0.00275 × nud + 0.68125) in the range where nud <= 31, and satisfies the relationship (-0.00162 × nud + 0.63822) <= (thetag, F) <= (-0.00162 × nud + 0.64622) in the range where nud > 31.

Description

technical field [0001] The present invention relates to optical glass, preform and optical element. Background technique [0002] Although optical systems such as digital cameras and video cameras vary in size, they all have bleeding called aberrations. This aberration is classified into monochromatic aberration and chromatic aberration, 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 this undivided blue region is called secondary spectrum. To correct the secondary spectrum, it is necessary to perform an optical design that takes into account the movement of g-rays (435.835 nm) in the blue region. At this time, the partial dispersion ratio (θg,...

Claims

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Application Information

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IPC IPC(8): C03C3/15C03C3/068C03C3/155C03C3/19C03C3/21C03C3/253G02B1/00
CPCC03C3/155
Inventor 津田哲也
Owner OHARA
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