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Optical glass, preform, and optical element

a technology of optical glass and preform, applied in the field of optical glass, preform, optical element, etc., can solve the problems of not being able to meet the needs of use as a lens, and the partial dispersion ratio of 1 is not small

Inactive Publication Date: 2020-01-23
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The optical glass achieves reduced chromatic aberrations, lower specific gravity, high transmittance in the visible range, and lower glass transition points, enabling more efficient optical system design and manufacturing with reduced weight and improved imaging characteristics.

Problems solved by technology

However, the glass disclosed in Patent Document 1 has a partial dispersion ratio which is not small, and is not sufficient for use as a lens for correcting the above mentioned secondary spectra.

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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examples

[0198]The compositions of Examples (No. A1 to No. A27, No. B1 to No. B11, and No. C1 to No. C12) of the present invention, and the results for the refractive index (nd), the Abbe number (νd), partial dispersion ratio (θg,F), wavelengths (λ5, λ80) showing spectral transmittances of 5% and 80%, glass transition point (Tg), yield point (At), average coefficient of linear expansion (α), and specific gravity, are shown in Tables 1 to 8. Herein, Examples (No. A1 to No. A27) may be taken as examples of first the optical glass; Examples (No. B1 to No. B11) may be taken as examples of the second optical glass, and Examples (No. C1 to No. C12) may be taken as examples of the third optical glass, but they are not limited to this. Further, the below examples are merely for the purpose of illustration, and the present invention is not in any way limited to these examples.

[0199]For the glasses of the examples, high purity raw materials usually used for optical glass such as all of the oxides, hyd...

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Abstract

An optical glass having a small partial dispersion ratio (θg,F), while having a refractive index (nd) and Abbe number (νd) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (νd) of 30 to 42, and a partial dispersion ratio (θg,F) of no greater than 0.594.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present invention is a continuation of U.S. patent application Ser. No. 15 / 787,057, filed on Oct. 18, 2017. U.S. patent application Ser. No. 15 / 787,057 is a continuation of U.S. patent application Ser. No. 15 / 347,185, filed on Nov. 9, 2016 and claims priority under 35 U.S.C. § 119 to Japanese Patent Application Nos. 2015-221565, 2015-221566, 2015-221567, each filed Nov. 11, 2015; and Japanese Patent Application Nos. 2016-213163, 2016-213164 and 2016-213165, each filed Oct. 31, 2016, the entire contents of all of these applications listed above is incorporated herein by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to an optical glass, a preform, and an optical element.Related Art[0003]Optical systems such as digital cameras and video cameras and the like, to varying degrees have blurring referred to as aberrations. These aberrations are classified as monochromatic aberrations and chroma...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C03C3/097C03C3/064C03C3/068
CPCC03C3/068C03C3/097C03C3/064G02B27/0062
Inventor KIKKAWA, KENNAGAOKA, ATSUSHI
Owner OHARA