JPS62143847A - Marking of glass ware - Google Patents

Abstract

PURPOSE:To apply a desired colored pattern to a surface of a glass ware containing metal oxide as a glass material, by reducing the metal oxide to form a color metal thin film and evaporating and removing a part of the metal thin film by heating with a laser beam, etc. CONSTITUTION:A cut end of a glass tube containing a metal oxide such as PbO as a part of the composition is rounded by heating with a reducing flame burner 2 using LNG, LPG or city gas as a fuel. PbO is reduced to Pb by this process to form a color metal thin film 3. The glass tube 1 is assembled with a glass part 4 and a metallic part 5 by heating and pressing. The color metal thin film 3 of the glass tube 1 is scanned with a laser beam 6 along a prescribed shape to effect the heating and evaporation of a part of the color Pb metal thin film 3 and to form a desired pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for engraving glass products to form desired patterns such as letters, symbols, figures, etc. on glass products made of glass containing glass-forming metal oxides.

[Technical background of the invention and its problems] In general, methods for marking glass products to form desired patterns such as letters, symbols, figures, etc. on glass products include the printing method, the Edgereg method, and the method of printing heat-softened glass with a metal mold. There are molding methods such as molding with.

There are few problems with engraving using such a molding method, for example, in the case of glass products such as bottles and tableware, which have a relatively large area for engraving. However, in the molding method, unevenness is formed on the surface, so for example, in the case of an electron tube stem, etc.
The positions that can be engraved are limited to those that do not damage the characteristics of the product. In addition, especially with stems for electron tubes, since the product is small, the area that can be engraved is narrow, making it difficult to engrave many characters, symbols, etc., and there are many small stems for electron tubes that cannot be engraved. . Furthermore, for glass products such as stems for electron tubes that require a heating process such as heat sealing after being engraved, if the inscription is made using a molding method, thermal deformation may occur and the inscription may become illegible.

In order to solve these problems, we have developed a method in which the surface of the glass product is directly heated with CO2 radar to engrave it, a colored metal thin film is deposited on the glass product surface, and this colored metal thin film is evaporated and removed using a YAG laser. , methods of engraving, etc. have been proposed.

However, in the method using a CO2 laser, since the glass product is locally ignited, fine cracks and distortions occur, which impairs quality, and the necessary equipment is expensive. In addition, the method of depositing a colored metal thin film on the surface of a glass product and removing it with a YAG laser requires an expensive vapor deposition device and has the problem that the process is complicated. - [Object of the Invention] The present invention has been made in response to the above-mentioned conventional circumstances, and can produce more high-quality characters and letters than with the conventional method using simple equipment and processes without impairing the quality of glass products. The purpose of this invention is to provide a method for marking glass products with which symbols, figures, etc. can be stamped.

[Summary of the Invention] That is, the present invention provides a method for stamping a glass product to form a desired pattern on a glass product made of glass containing a glass-forming metal oxide, which includes reducing the glass-forming metal oxide to stamp the glass product. By forming a colored metal thin film on the surface layer, and then using a laser to heat and evaporate a portion of the colored metal thin film to remove it and form the desired pattern, the quality of the glass product can be improved. It is possible to engrave a larger number of high-quality characters, symbols, figures, etc. than conventional methods using a simple device and process.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the steps of an example in which the method of the present invention is applied to stamping of a stem for an electron tube. In this example, first, the cut portion of a glass tube 1 cut from a raw glass tube is heated with a burner and rolled. At this time, the glass tube 1 is heated with a reducing flame burner 2 using, for example, LNG, LPG, or city gas and heat-removed air.
Glass-forming metal oxides such as pb○ in the Pb
Then, a colored metal thin film 3 is formed on the surface layer of the glass tube 1 (
a).

Next, the colored metal film 3 of the glass tube 1 assembled with the glass parts 4 and metal parts 5 by heating and press molding is scanned along a desired pattern with a laser beam 6 such as a YAG laser.
Part of the colored metal thin film 3 is heated and evaporated to form a desired pattern (b).

In the method of this embodiment described above, the reducing flame burner 2 is used to reduce the glass-forming metal oxide in the glass tube 1 to form a colored metal thin film 3. By scanning, heating is removed and the desired pattern is engraved, so a relatively low-power laser device can be used, and there is no need for vapor deposition equipment, so glass products can be engraved with simple equipment and processes. can be carried out, and the cost will also be paid.

In addition, it is possible to use a laser in a wavelength range that is difficult to absorb by glass, and there are no harmful fine cracks or local distortions in the glass, and there are almost no irregularities caused by markings, so the quality of glass products can be improved by 10 times. .

In other words, by changing the scanning of the Ray I Aro, it is possible to freely select the contents to be engraved, such as minute markings, and it is possible to make many clear and high-quality markings that do not easily get wet.

In this embodiment, the reduction flame burner 2 is used to burn the glass tube 1.
However, the present invention is not limited to such embodiments (for example, as shown in FIG. 2, the glass tube 1 and glass parts were reduced in a reducing atmosphere such as H2). The colored metal thin film 3 may be formed by reducing the glass-forming metal oxide in any way, such as by heating the glass.

[Effects of the Invention] As mentioned above, in the 61 mark method for glass products of the present invention, a colored metal thin film is formed on the surface layer of the glass product by avoiding reduction of the glass-forming metal oxide of the glass product, and then laser treatment is performed. A part of the colored metal thin film is removed by heating and evaporating using a wafer to form the desired pattern, so the quality of the glass product is not affected and it is easy to use. It is possible to engrave more high-quality characters, symbols, figures, etc. than before.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the steps of a method according to an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing an example of a reduction method. 1...Glass tube 2...Reducing flame burner 3...Colored metal thin film 6...Yag laser Applicant Toshiba Corporation Patent Attorney Sasa Suyama - Figure 1 Figure 2

Claims (1)

[Claims] (1) In a glass product engraving method for forming a desired pattern on a glass product made of glass containing a glass-forming metal oxide, the glass-forming metal oxide is reduced to form a colored metal thin film on the surface layer of the glass product. forming, and then using a laser to heat and evaporate a part of the colored metal thin film and remove it,
A method for engraving glass products, characterized by forming the desired pattern.