Lens, near-infrared ray absorption glass lot and manufacturing method therefore

A near-infrared ray and manufacturing method technology, applied in glass manufacturing equipment, glass pressing, manufacturing tools, etc., can solve the problems of insufficient lens performance and inability to use aspheric lens performance, etc., and achieve excellent imaging performance and color sensitivity correction function Effect

Inactive Publication Date: 2007-04-04
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in use as a lens, no matter how precisely the lens is formed, when the accuracy of the refractive index is not high, the performance as a lens inevitably becomes insufficient
In particular, there is a problem that even when glass is used to form an aspheric lens that is effective in obtaining higher performance and miniaturization of the optical system, the performance as an aspheric lens cannot be utilized.

Method used

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  • Lens, near-infrared ray absorption glass lot and manufacturing method therefore
  • Lens, near-infrared ray absorption glass lot and manufacturing method therefore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0150] Example 1-1 (manufacturing example of a near-infrared-absorbing glass batch)

[0151] First, using fluoride, metaphosphorus compound, and oxide as glass raw materials, the raw materials were weighed into A and B glasses each having the composition shown in Table 1, and mixed thoroughly. After that, the mixed raw material was charged into a platinum crucible sealed with a lid, and heated and melted in an electric furnace at a temperature ranging from 790 to 850° C. under a dry nitrogen atmosphere under stirring. In the platinum crucible, dry nitrogen gas having a dew point of -30°C or less was always flowed, and the gas kept in the crucible for a constant time or longer was exhausted to continuously replace the atmosphere. The evacuated gas is filtered for purification and discharged to the outside.

[0152] While replacing the atmosphere, the molten glass in this state is clarified and homogenized so that the resulting molten glass flows continuously from a temperature...

Embodiment 1-2

[0168] Example 1-2 (manufacturing example of an optical element)

[0169] Next, the round rod glass obtained in Example 1-1 was vertically cut into a longer direction, ground and polished to prepare spherical lenses or prisms.

[0170] Subsequently, the round rod glass obtained in Example 1-1 was vertically cut into a longer direction, ground and polished to prepare a precision compression molding preform.

[0171]Then, the mold is changed to form sheet glass from the molten glass. Subsequently, the sheet glass is slowly cooled, cut, ground and polished to produce optical elements such as spherical lenses or prisms. In addition, sheet glass is cut, ground, and polished to produce precision compression molded preforms.

[0172] The preform thus obtained was subjected to precision compression molding using an extruder shown in FIG. 1 to obtain an aspheric lens. Specifically, after the preform 4 is placed between the lower mold 2 and the upper mold 1 of the compression mold fo...

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Abstract

In a near-infrared ray absorption glass lot made of a copper-containing near-infrared ray absorption glass material, a near-infrared ray absorption glass lot is constituted of a glass material of which the tolerance of the refractive index (ne) at a wavelength of 546.07 nm is less than +-0.001.

Description

technical field [0001] The present invention relates to a near-infrared absorbing glass lot suitable for color correction of semiconductor imaging elements and a method of manufacturing an optical element using the glass lot. [0002] The present invention also relates to a Cu-containing fluorophosphate glass lens and a manufacturing method thereof, and also relates to an imaging lens with the function of a near-infrared absorption filter suitable for color correction of semiconductor imaging elements such as CCD or CMOS. Background technique [0003] Generally, a semiconductor imaging element such as a CCD or a CMOS has a spectral sensitivity extending from the visible light region to the near infrared region (see Japanese Patent Unexamined Publication JP-A-10-194777). Therefore, a method is adopted in which a filter is used to cut the near-infrared region to make the spectral sensitivity close to human visibility to improve color reproducibility. O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C4/08C03B11/08C03C3/247
Inventor 邹学禄蜂谷洋一池西干男
Owner HOYA CORP
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