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Optical glass, preform and optical element

A technology of optical glass and preforms, applied in optical components, optics, instruments, etc.

Active Publication Date: 2015-07-15
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the combination of these lenses can only correct the aberrations in the red and green regions, leaving the 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0190] The glass compositions of Examples (No.1 to No.36) and Comparative Example (No.A) of the present invention and the refractive index (n d ), Abbe number (ν d ), partial dispersion ratio (θg, F), glass transition point (Tg), crystallization onset temperature (Tx), difference between glass transition point and crystallization onset temperature (ΔT), and spectral transmittance are shown as 70% and 5% of the wavelength (λ 70 , lambda 5 ) results are shown in Table 1 to Table 8. In addition, the Abbe number (ν d ) and the partial dispersion ratio (θg, F) ​​are shown in figure 2 . It should be noted that the following examples are for illustrative purposes only, and the present invention is not limited to these examples.

[0191] The optical glass of the examples (No.1~No.36) of the present invention and the glass of the comparative example (No.A) are produced as follows: as the raw materials of each component, the respective corresponding oxides, hydroxides Carbonate,...

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Abstract

Disclosed are: an optical glass which is capable of highly precisely correcting chromatic aberrations of a lens, while having an Abbe number (?d) within a desired range; a preform using the optical glass; and an optical element using the optical glass. Specifically disclosed is an optical glass which contains, in mass%, less than 75.0% of an Nb2O5 component and less than 40.0% of a P2O5 component relative to the total mass of the glass composition in terms of oxides, while having a partial dispersion ratio (?g, F) of 0.62-0.69 (inclusive) and an Abbe number (?d) of 15-27 (inclusive). Also specifically disclosed are a preform and an optical element, each of which is composed of the optical glass.

Description

[0001] technology area [0002] The present invention relates to optical glasses, preforms and optical elements. Background technique [0003] Optical systems such as digital still cameras and video cameras contain varying degrees of bleeding called aberrations. This aberration is classified into monochromatic aberration and chromatic aberration, wherein especially chromatic aberration strongly depends on the material properties of lenses used in the optical system. [0004] Typically, chromatic aberration can be corrected by combining a low-dispersion convex lens with a high-dispersion concave lens. However, the combination of these lenses can only correct aberrations in the red and green regions, leaving aberrations in the blue region. This aberration in the blue region that cannot be completely removed is called the secondary spectrum. In order to correct the secondary spectrum, it is necessary to design the optics with reference to the movement of g-rays (435.835nm) in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/16C03C3/097C03C3/19C03C3/21G02B1/00
CPCC03C3/21C03C3/064C03C3/062C03C3/097C03C3/16C03C3/19G02B1/00
Inventor 永冈敦
Owner OHARA
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