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Optical glass, preform and optical element

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

Active Publication Date: 2017-12-05
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 only the aberrations in the red and green regions can be corrected by the above combination, and the aberrations in the blue region 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

Examples

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Embodiment

[0307] Examples of the present invention (No.A1 to No.A151, No.B1 to No.B10, No.C1 to No.C169) and comparative examples (No.a1, No.b1 to No.b2, No.c1) Composition, and the refractive index (n d ) and Abbe number (ν d ), partial dispersion (θg, F) ​​and specific gravity are shown in Tables 1 to 45.

[0308] Among them, Examples (No.A1 to No.A151) and Comparative Example (No.a1) are Examples and Comparative Examples related to the first optical glass.

[0309] In addition, an Example (No.B1-No.B10) and a comparative example (No.b1-No.b2) are an Example and a comparative example related to 2nd optical glass.

[0310] In addition, an Example (No.C1-No.C169) and a comparative example (No.c1) are an Example and a comparative example related to the 3rd optical glass.

[0311] It should be noted that the following embodiments are always for the purpose of illustration, and are not limited to these embodiments.

[0312] The glass of the embodiment of the present invention and the c...

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Abstract

The present invention provides optical glass with a refractive index (nd) and Abbe number (vd) within a desired range, and preferably used for chromatic aberration correction, and a lens preform using the optical glass. The optical glass contains B203 component and component F in the composition converted to oxide. The preform and an optical element are formed by the above optical glass.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/064C03B11/08G02B1/00
CPCC03C3/068C03C4/00G02B1/00
Inventor 荻野道子小栗史裕
Owner OHARA
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