Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for forecasting refractive index of glass optical element and method for manufacturing glass blank

A technology of optical components and manufacturing methods, applied in the fields of optical components, optics, instruments, etc., can solve problems such as obstacles to efficient production of optical components, difficult to solve problems, etc.

Inactive Publication Date: 2010-09-29
HOYA CORP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to adjust the above-mentioned components, and it is difficult to solve the problem when the information on the composition possessed by the glass producer and the information on annealing possessed by the optical element producer cannot be shared.
[0011] This situation hinders the efficient production of optical components with desired optical properties

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
  • Method for forecasting refractive index of glass optical element and method for manufacturing glass blank
  • Method for forecasting refractive index of glass optical element and method for manufacturing glass blank
  • Method for forecasting refractive index of glass optical element and method for manufacturing glass blank

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0243] Glass A was processed into three sizes of length 30 mm x width 20 mm x thickness 15 mm, and it was used as a test piece.

[0244] After heating three test pieces of glass A above the glass transition temperature, they were cooled at the cooling rates of -1°C / hour, -3°C / hour, and -10°C / hour respectively, and after cooling down to room temperature, the measured refractive index. Table 1 shows measured values ​​of the refractive index nd at a wavelength of 587.56 nm at each cooling rate. These values ​​are still figure 1 displayed in .

[0245] 【Table 1】

[0246] Table 1. nd values ​​of glass A versus cooling rate

[0247] Cooling rate [℃ / hour]

nd

-1

1.69537

-3

1.69478

[0248] Cooling rate [℃ / hour]

nd

-10

1.69408

[0249] When the horizontal axis is taken as the common logarithm of the cooling rate and the vertical axis is taken as the nd value, when the measurement results shown in Table...

Embodiment 1

[0269] [calculation of effective cooling rate]

[0270] Two types of glass A and glass B having different compositions are placed side by side in an annealing furnace where the annealing rate can be precisely set, and heat-treated. Here, glass A and glass B having mutually different components are selected so that the annealing coefficients of glass A and glass B are different values. Table 4 shows the refractive indices of glass A and glass B when cooled at a cooling rate of −1° C. / hour (reference annealing rate).

[0271] 【Table 4】

[0272] Table 4. Refractive index of glass A and glass B at each wavelength when the cooling rate is -1°C / hour

[0273]

c

nd

f

ng

Glass A

1.69120

1.69513

1.70418

1.71128

glass B

1.58740

1.59035

1.59701

1.60218

[0274] In addition, Table 5 shows the annealing coefficients of glass A and glass B at each wavelength. In addition, the annealing coefficient was ...

Embodiment 2

[0312] 【Table 9】

[0313] Table 9. Expected nd, vd values

[0314] nd

c

f

vd

1.69150

1.68751

1.70063

52.7

[0315] Hereinafter, a simulation is performed when glass C having properties shown in Tables 10 and 11 is used. Table 10 shows the refractive index of glass C when annealed at a standard annealing rate of -1°C / hour. Table 11 shows the annealing coefficients obtained by the same method as Table 3 of Reference Example 1. In addition, even if the annealing coefficient obtained in the same manner as in Table 2 of Reference Example 1 was used, the following operations could be performed in the same manner.

[0316] 【Table 10】

[0317] Table 10. Property values ​​of Glass C

[0318] cooling rate

nd

c

f

vd

-1℃ / hour

1.69536

1.69141

1.70444

53.4

[0319] 【Table 11】

[0320] Table 11. β value of glass C at each wavelength

[0321] βC

βd

βF

...

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

The invention provides a method for forecasting refractive index of glass optical element and method for manufacturing glass blank. The method for forecasting the refractive index or Abbe number of the glass optical element obtained in the method for manufacturing glass optical element is provided, the method for manufacturing the glass optical element includes a step of annealing the glass optical element obtained by stamping forming. The method includes: using a glass blank A containing any components to calculate the effect cooling speed of an annealing device for annealing the glass optical element, calculating the reference refractive index for a glass blank B for manufacturing the glass optical element, calculating the refractive index or Abbe number of the glass optical element obtained by annealing using the annealing device running under the condition the same as the above step and composed of the glass blank B according to the effect cooling speed and the reference refractive index.

Description

technical field [0001] The present invention relates to a method of predicting the refractive index of an optical element made of glass, and a method of manufacturing a glass blank whose composition has been adjusted. Background technique [0002] In order to obtain optical elements made of glass with desired optical performance, optical glass with high shape accuracy and high-precision determination of optical properties such as refractive index is required. [0003] The optical properties of glass are determined by its composition, but even if the composition is identical, the refractive index will change slightly according to the changes experienced by the optical element when it is manufactured, and the amount of change will greatly affect the performance of the optical element. Focusing on this phenomenon, Patent Documents 1 and 2 disclose techniques for obtaining a desired refractive index in consideration of heat exposure history. [0004] 【Advanced technical documen...

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): C03B25/00G02B1/00
Inventor 池上豊
Owner HOYA CORP