Optical glass

An optical glass, glass technology, used in optics, optical components, instruments, etc.

Inactive Publication Date: 2012-05-23
OHARA
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chromatic aberration can generally be corrected by combining a convex lens with low dispersion and a concave lens with high dispersion. However, when this combination is used, only the aberrations in the red and green areas can be corrected, leaving the aberration in the blue area.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical glass
  • Optical glass
  • Optical glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0192] The composition and refractive index (n d ), Abbe number (v d ), partial dispersion ratio (θg, F), chemical durability (water resistance), glass transition temperature (Tg), deformation point (At), wavelength showing 70% spectral transmittance (λ 70 ), and the results of overexposure are shown in Tables 1 to 33. In addition, the following examples are the purpose of illustration after all, and are not limited to these examples.

[0193] The glasses of Examples (No.1-No.250) and Comparative Examples (No.1-No.2) of the present invention are all produced as follows: as raw materials for each component, corresponding oxides, hydroxides, Carbonates, nitrates, fluorides, hydroxides, metaphosphoric acid compounds, and other high-purity raw materials that are generally used in optical glass are prepared according to the composition of each example and each comparative example shown in Tables 1 to 33. Weigh and mix uniformly according to the ratio, then put it into a platinum...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Disclosed are: an optical glass which has a refractive index (nd) and an Abbe's number (Nu d) that fall within predetermined ranges and also has a small relative partial dispersion (Theta g, F); and a lens preform which is produced using the optical glass. The optical glass contains an SiO2 component as an essential component, additionally contains at least any one component selected from an Nb2O5 component, a TiO2 component, a ZrO2 component, a Ta2O5 component and a WO3 component, and has a refractive index (nd) of 1.78 or more and an Abbe's number (Nu d) of 30 or less, wherein the relative partial dispersion (Theta g, F) and the Abbe's number (Nu d) of the optical glass fulfill the relationship represented by formula: (-1.60*10-3*Nu d+0.6346) <= (Theta g, F) <= (-4.21*10-3* Nu d+0.7207) when Nu d falls within the range of 25 or less (i.e., Nud <= 25) and fulfill the relationship represented by formula: (-2.50*10-3*Nu d+0.6571) <= (Theta g, F) <= (-4.21*10-3*Nu d+0.7207) when Nu d falls within the range of more than 25 (i.e., Nu d > 25).

Description

technical field [0001] The present invention relates to optical glass. Background technique [0002] Optical systems such as digital still cameras and video cameras all include bleeding called aberration, albeit to varying degrees. 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. [0003] Chromatic aberration can generally be corrected by combining a convex lens with low dispersion and a concave lens with high dispersion. However, when this combination is used, only the aberrations in the red and green areas can be corrected, leaving the aberration in the blue area. . 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 refer to the movement of the g-line (435.835nm) in the blue region for optical design....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C03C3/062C03C3/064C03C3/066C03C3/068C03C3/085C03C3/087C03C3/089C03C3/091C03C3/093C03C3/095C03C3/097G02B1/00
CPCC03C3/068C03C3/064C03C3/062C03C3/085C03C3/091G02B1/00
Inventor 上原进
Owner OHARA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap