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Glass discharge tube, glass shaping body and optical element production

A manufacturing method and glass forming technology, applied in glass manufacturing equipment, manufacturing tools, feeding troughs, etc., can solve the problems of reduced inner diameter accuracy, inability to control glass outflow, and increased ratio.

Inactive Publication Date: 2006-05-31
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, although the inner diameter of the pipe is reduced, if the inner diameter of the pipe is simply reduced, the inner diameter tolerance is equal to the inner diameter tolerance of the conventional pipe because only the inner diameter is reduced, so the ratio of the inner diameter tolerance to the inner diameter increases (Inner diameter accuracy decreases), resulting in glass outflow deviation from the set value
Although it is possible to adjust the temperature of the tube based on temperature control and change the viscosity of the glass to eliminate this deviation, it is difficult to control the outflow of the glass properly because the change in the viscosity of the glass is small when the temperature is changed near the outflow temperature. In the range
[0008] As a result, the outflow of the glass cannot be controlled within an appropriate range, resulting in many problems, for example, as mentioned above, the glass is not sufficiently debubbled; the glass is colored due to the incorporation of platinum alloys, etc.; the refractive index deviates from the set value; Creation of texture etc. on the obtained glass molded body

Method used

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  • Glass discharge tube, glass shaping body and optical element production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] A1 to A12 and B-1 in Table 1-1 and Table 1-2 were produced using a platinum alloy material formed of an alloy of platinum and gold in which 5% by weight of gold was added to pure platinum, and a platinum material formed of pure platinum. ~B-12, C-1~C-12, D-1~D8, E1~E-4 show 48 kinds of glass outflow tubes.

[0100] First, in each tube, the sum of the inner diameter φ and twice the wall thickness t of the tube is the outer diameter of the tube, and a platinum alloy having a diameter corresponding to the outer diameter of each tube obtained and a length of 275 nm is produced. Cylinders and platinum cylinders with a length of 25mm. The bottom and top surfaces of the platinum alloy cylinder and the platinum cylinder are flat and parallel to each other to form mirror surfaces.

[0101] Then, the center of the drilling machine is precisely aligned with the central axes of the cylinders of the two materials, and a through hole is drilled out of the cylinders. The diameter of...

Embodiment 2

[0116] Next, using each of the glass outflow tubes produced in Example 1, molded bodies made of optical glass as shown in Table 2 were produced.

[0117] In addition, the glass properties shown in Table 2 were measured as follows.

[0118] [Refractive index (nd) and Abbe number (υd)]

[0119] The refractive index (nd) and Abbe's number (υd) of the optical glass obtained by slow cooling at -30°C / hour were measured.

[0120] Liquefaction temperature

[0121] Add 50g of glass sample into the platinum crucible, heat and melt the obtained glass melt and keep it in the test furnace with the set temperature for 2 hours, then cool to room temperature, and then repeat the above process with an increase of 10°C each time. The presence or absence of crystallization was observed under a microscope, and the lowest temperature without crystallization was taken as the liquefaction temperature.

[0122] [viscosity of glass]

[0123] The viscosity of glass was measured by the viscosity mea...

Embodiment 3

[0159] Embodiment 3 (manufacture of optical element)

[0160] Next, an optical element was produced using the glass molded body produced in Example 2.

[0161] (1) Manufacturing an optical element using a plate-shaped glass molded body made of glass U produced by method I

[0162] A plate-shaped glass molded body made of glass U is cut to a certain size, and a plurality of cut pieces of equal weight are produced, which are barrel-polished to produce raw glass for press molding. Coat boron nitride evenly on the entire surface of the raw glass as a powder release agent, heat and soften in the atmosphere, press and mold in a press molding mold, and mold it into a shape similar to a lens.

[0163] Next, annealing is performed to reduce distortion, and the surface is ground and polished to manufacture a spherical lens. The optical characteristics of the obtained lens exactly matched the values ​​shown in Table 2, and it was a high-quality lens free from defects such as coloring a...

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Abstract

Provides glass outflow tubes for the manufacture of high-quality glass moldings. The provided glass outflow tube is a glass outflow tube for flowing out molten glass, and is characterized in that its inner diameter φ is less than or equal to 6 mm, and the difference between the maximum value φmax of the internal diameter and the minimum value φmin of the internal diameter is within 0.20 mm.

Description

technical field [0001] The present invention relates to a pipe for flowing out molten glass, a method for manufacturing a glass molded body that flows out and shapes the molten glass, and a method for manufacturing an optical element using the glass molded body. Background technique [0002] As a method of mass-producing extremely high-quality glass such as optical glass, the following method is widely known. After heating and melting glass raw materials to make molten glass that is homogeneous and free of bubbles, the molten glass is flowed out from a tube and poured. Molding is carried out in a mold or the like (for example, refer to Patent Document 1). [0003] [Patent Document 1] Japanese Patent Publication No. 45-19987 [0004] With the development of optical devices, in recent years, there has been an increased demand for glass with low dispersion characteristics, filter glass for color correction of solid-state imaging elements, or new types of glass with high refrac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B7/00C03B7/02
Inventor 铃木恒司高桥幸二
Owner HOYA CORP