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Bright pressing method of optical element

An optical and bright technology used in glass pressing, manufacturing tools, glass forming, etc.

Inactive Publication Date: 2004-03-03
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main disadvantage of the currently known methods is that, in particular, bright pressed optical elements with larger diameters cannot be economically produced in the required quality

Method used

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  • Bright pressing method of optical element
  • Bright pressing method of optical element
  • Bright pressing method of optical element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 Firstly, the time course of the pressure mold temperature and the glass body temperature is shown in graph form according to the first method according to the invention, wherein a voltage is applied to the glass body via the upper mold and the lower mold. In another graph, the course of the pressing force over time is also shown.

[0030] At the start of the process, the mold is continuously heated above the sticking temperature T 0 And up to a higher than the sticking temperature T 0 temperature T 1 . In the case of the glass body not adhering to the stamper, this is only achieved by applying an electrical voltage to the glass body by means of the stamper. During this process stage, the temperature of the glass body gradually approaches the mold temperature. After the stamper and the glass body have reached a common temperature, during the time period "press 1", the maximum pressing force is applied to the glass body. Until the time "press 2" is reached,...

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Abstract

Methods for press molding a glass body, especially for optical applications, without additional grinding and polishing steps are described. One method is performed with a press mold having an upper mold part, a lower mold part and, if necessary or desired, a ring. In order to improve the quality of the products, especially glass bodies of larger diameters, a voltage is applied across the upper mold part and the lower mold part when the glass body is within the press mold and a pressing force is applied to the glass body when the temperature of the glass body matches the temperature of the press mold. Alternatively, in another method the press mold is cooled after it reaches a predetermined temperature and the pressing force is applied to the glass body in the mold after exceeding the sticking temperature (T0).

Description

technical field [0001] The invention relates to a method for bright pressing of glass bodies, in particular for optical applications, and a device for carrying out the method, which method is brightened using a pressing die comprising an upper mold and a lower mold and / or a ring Pressing, the mold used to contain the glass body heated above the deformation temperature. [0002] The term "bright pressing" refers to the pressing of a glass body such that the optically active faces of the glass body do not require post-processing, thereby eliminating the need for grinding and polishing steps for these faces. Background technique [0003] JP 255 26 29 describes such a method in which the glass body is processed in a two-stage pressing process and the shaped glass body is cooled during the pressing process. In a preferred embodiment, a cylindrical blank in the form of a glass body is inserted between an upper mold and a lower mold, heated and subsequently shaped by pressing. Af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B11/00C03B11/08C03B11/12C03B40/00
CPCC03B40/00C03B11/122C03B11/08C03B11/125
Inventor U·施特尔R·比尔蒂姆普费尔W·塞马
Owner SCHOTT AG