KR20170081327A - Slimmed cover glass for mobile apparatus, and Manufacturing method thereof - Google Patents

Abstract

The present invention relates to a decorative multi-layer thin film which can realize a desired color by designing and depositing a multilayer coating film by simultaneously performing a slimming process and a fine patterning process on a glass substrate of a circular plate, And a method for producing the same.
Accordingly, it is an object of the present invention to provide a method for manufacturing a glass substrate, which comprises forming a groove on a window cover glass substrate through a method such as scribing, water jet, laser beam, or sand blast, The entire thickness of the substrate is thinned, chemically strengthened, and the multilayer thin film is coated thereon to provide a cover glass having a desired color.
Further, assuming that a multilayer coating film formed by sandwiching a metal reflection layer between the material layers having a low refractive index is formed on a glass substrate, material and thickness information for the multilayer coating film are input to a computer simulation program, Simulations were performed to determine the hue, lightness and chroma, refractive index, fractional coefficient, physical thickness and optical thickness realized by the entire multilayer coating film formed on the glass substrate, and the color to be seen with the naked eye was determined as the color on the colorimetric system Layered thin film of the present invention.

Description

Technical Field [0001] The present invention relates to a slimming cover glass for mobile devices and a manufacturing method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover glass of a portable terminal such as a smart phone, and more particularly, to a pattern formation and decoration coating technique for giving a feel to a cover glass.

Conventionally, a cover glass for a mobile device has been commonly used to form a design on a sheet material such as PET by using an anti-scattering film (ASF) technology and to adhere it with an adhesive. In recent years, In order to provide aesthetic feel to the bezel and backside tempered glass, the tempered glass is etched to give a fine bend or engrave, and a polymer resin layer with bending on the surface or a scattering layer including fine beads is formed Korean Patent Publication No. 10-2015-0106854). These ornamental qualities are complicated and costly raw materials.

In such a method, it is troublesome to form fine bending through masking with an acid-resistant photoresist ink and an etching process and a masking process, and an expensive process cost may be generated. In the process of forming a fine bending pattern, Substrate processing can not be performed, and scratches, fine chipping, cracks, and the like are generated, thereby deteriorating the strength characteristics of the tempered glass.

On the other hand, the hue formed by depositing a multi-layered metal thin film layer on the micro-bending layer may include various factors such as thickness, material, and number of layers of the multi-layered film as a control factor. And it is difficult to design a thin film.

Accordingly, it is an object of the present invention to provide a cover glass pattern forming method and a cover glass which can form a pattern on a glass substrate in a more simplified process, while reducing costs and preventing problems such as scratches. Also, it is intended to provide a means for predicting a color by a coating film in advance so as to realize a desired color by coating a multilayer thin film on a cover glass, thereby realizing a color with excellent decorative property.

More specifically, the present invention aims to improve the strength of the glass by simultaneously performing the slimming process and the fine patterning process on the glass substrate of the original plate through a chemical strengthening process, and then designing and depositing a multilayer coating film, And a method for manufacturing the ornamental multilayer thin film.

In order to accomplish the object of the present invention as described above, a groove is formed in a window cover glass substrate through a method such as scribing, water jet, laser beam, sand blast, etc., and a slimming process is performed, Provided is a method of manufacturing a cover glass in which the entire thickness of a disc glass substrate having a pattern portion is reduced.

According to the present invention, a pattern is formed on the upper surface of a disk glass substrate at a predetermined interval with fine grooves, the substrate is vertically arranged to thinly etch the glass substrate on which the pattern is formed,

Dip or spray the etch solution.

It is preferable to spray the surface of the glass substrate by using the etchant injection device in order to ensure the uniformity of the whole glass substrate.

In the above, the fine groove pattern formation may be performed by any of laser beam, scribing, water jet, and sand blasting.

In the above, the fine grooved pattern has a function of displaying a cell unit boundary line in addition to a decoration function, and the fine groove pattern serving as a boundary line of a cell unit is formed into a groove deeply deeper than that for decoration. The depth of the groove, which is the boundary line of the cell unit, is formed twice or more than that of the general groove.

When the fine pattern formation and the slimming process are completed, the substrate is cut in units of cells along the cell unit boundary to secure a plurality of substrates in units of cells.

The glass substrate in a cell unit is subjected to a chemical strengthening process, and then a multilayer thin film is formed to become a window cover glass which realizes a desired color.

In order to realize color by depositing a multilayer thin film on a glass substrate, a low refractive index material and a metal reflection layer are formed, and the material, thickness, and number of layers of the thin film matched with the computer simulation result are selected, And a method for manufacturing a multilayer thin film according to the method.

According to the present invention, the slurry process and the fine pattern process are uniformly performed on the glass substrate of the original plate, and there is no inconvenience of forming fine bending through the etching process and the masking removal process by masking with the acid-resistant photoresist ink, No cost is required.

Further, in the photolithography process for forming a conventional micro-bending pattern, scratches, fine chipping, cracks, and the like are generated while the reinforced glass substrate is transferred in units of cells, thereby reducing the factor of lowering the strength characteristics of the tempered glass.

In order to realize a color by depositing a multilayer thin film on a glass substrate, a low reflectivity material and a metal reflection layer are formed, and a material of a thin film matched with a computer simulation result, thickness, and the number of layers can be selected.

 In addition, it is possible to accurately predict the colors that can be realized by associating the reflectance of the multilayer thin film with the colorimetric system through computer simulation, and it is possible to precisely estimate the thickness and / or composition of the metal reflective layer between the low- And the desired color can be searched.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process example showing a manufacturing method of a slimming cover glass for a mobile device according to an embodiment of the present invention (separated into a cell unit glass substrate after forming a print layer).
FIG. 2 is a view illustrating an example of a process for producing a slimming cover glass for a mobile device according to an embodiment of the present invention (after a chemical strengthening process, a cell unit glass substrate is separated and a side etching process is performed, formation).
3 is a plan view of a slimming cover glass for a disc-unit mobile device according to the present invention.
4 is a graph showing the reflectance including the visible light band among simulation results according to the multilayer thin film design.
Figure 5 illustrates the simulation and colorimetric embodiments of the present invention.
6 is a digital camera image of a slimming cover glass for a mobile device according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are diagrams illustrating a process for producing a slimming cover glass for a mobile device according to an embodiment of the present invention.

As shown in the drawings, the present invention provides a method of manufacturing a liquid crystal display device, comprising the steps of: preparing a disc glass; forming a groove in the disc glass to display a decoration function and a boundary line in a unit cell; Forming a fine metal pattern layer on the fine patterned glass plate by a slimming process to form a fine pattern by reducing the thickness of the entirety of the plate glass; Forming a printed layer of the thin film on the substrate, blocking light emitted from the mobile device panel, separating the disk glass consisting of the fine pattern, the metal thin film layer, and the print layer on a cell basis, And etching the side surface of the cover glass.

In the case of FIG. 2, a side etching process is performed after the disk glass chemical strengthening process of the present invention, and the process is separated into unit cells to form a metal thin film deposition and a printing layer. In order to etch the patterned glass substrate as a whole, the substrate is placed vertically and dipped or sprayed into the etching solution. It is advantageous to spray the surface of the glass substrate by using the etchant injector in order to ensure the uniformity of the whole glass substrate. In the case of dipping, horizontal placement is possible, but vertical placement is good for space efficiency,

3 is a plan view of a slimming cover glass for a disc-unit mobile device according to the present invention.

The slimming cover glass for a mobile device has a groove formed in the disk glass to reduce the thickness of the disk glass during the slimming process and does not require a separate acid resistant photoresist masking process to form a fine pattern. The line width and depth of the fine pattern after the slimming process are 100 nm to 100 μm, and fine patterns are determined according to the line width and depth of the fine grooves. In the case of fine grooves, laser beam machining, scribing, water jet, sandblasting, or the like may be used. In the case of water jet and sandblasting, the entire surface of the glass substrate is contaminated during the process and a masking film is required. And scribing. In the case of a laser beam, it is possible to control the line width and depth of a fine groove formed by controlling process parameters such as frequency (Hz), power (kW), scan speed, and focal distance.

In the above, the fine grooved pattern has a function of displaying a cell unit boundary line in addition to a decoration function, and the fine groove pattern serving as a boundary line of a cell unit is formed into a groove deeply deeper than that for decoration. The depth of the groove, which is the boundary line of the cell unit, is formed twice or more than that of the general groove.

When the fine pattern formation and the slimming process are completed, the substrate is cut in units of cells along the cell unit boundary to secure a plurality of substrates for each cell unit. Of course, in the case where the glass substrate itself is a single cell, the fine groove patterns are all for decorating, so that the fine grooves for the boundary lines are not required.

The glass substrate in a cell unit is subjected to a chemical strengthening process, and then a multilayer thin film is formed to become a window cover glass which realizes a desired color. Since the chemical strengthening process can be carried out by a known technique, detailed description thereof is omitted.

4 is a graph showing the reflectance including the visible light band among simulation results according to the multilayer thin film design. FIG. 5 illustrates a simulation and colorimetric embodiment of the present invention. 6 is a digital camera image of a slimming cover glass for a mobile device according to an embodiment of the present invention

4 schematically illustrates an embodiment of the present invention. A computer simulation program is used to simulate coating a multilayer film on a glass substrate, and as a result, the color realized by the multilayer film corresponds to a color on a colorimetric system to find an expected color.

EMP (Essential MacleodProgram) was used for the design of the multilayer thin film, and CIE L * a * b * color system was used for the color system, but various other color systems could be applied.

In the design of the multilayer thin film, basically, a thin metal reflection layer is sandwiched between layers having a low refractive index, and information on the thickness, refractive index, and partition coefficient information of each layer is inputted so that the physical thickness, refractive index, optical thickness, And the reflectance is obtained for the wavelength band including the visible light. In addition, by the simulation program, color, lightness and chroma realized by the multilayer thin film can be known, and the result is found on the color system to predict the implemented color.

In the case of this embodiment, MgF ₂ is applied as a layer having a low refractive index and either Cr, Cu or Al is used as a metal reflective layer. At least one of Cr, Cu and Al may be used in combination. However, when a metal reflection layer of high purity is sandwiched, it is suitable for enhancing the reflectance to produce a pearl feeling. The thickness of the low refractive index material, MgF _2, is 25 times the thickness of the metal reflective layer. In this embodiment, the metal reflection layer has a thickness of 10 nm and the MgF ₂ thickness is 250 nm. It is preferable to use a PVD or CVD method to laminate the substantial multilayer thin film.

In the above, the simulation can be performed by changing various physical factors according to the layer of the multilayer thin film, and as a result, the implemented color can be found, recorded and stored in the color system.

In particular, it is desirable to fix a physical factor such as the thickness of MgF ₂ , change the thickness and composition of the metal reflection layer, search the reflectance and the color change on the color system to search for a desired color.

4 is a graph showing the reflectance including the visible light band among simulation results according to the multilayer thin film design. The reflectance differs depending on the metal layer material, and the color to be produced can be predicted by applying the wavelength band by the reflectance measurement value to the colorimetric system.

Further, simulation can be performed by forming a comb pattern on the glass substrate on which the multilayer thin film is laminated, and laminating the multilayer thin film on the comb substrate. By applying a comb pattern, fine irregularities are formed, so that it can act as a kind of diffraction grating and exhibit a color dispersion effect. In other words, you can get a pearly color that is iridescent. The irregularity level of the comb pattern can be about 0.1 to 1.0 mm. Due to the comb pattern formed by lithography, it is possible to improve grip feeling along with aesthetic sense.

In this manner, the color to be produced can be predicted in advance using simulation and colorimetric system without making many prototypes directly for a desired color.

MgF ₂ is applied as the low refractive index material, and either Cr, Cu or Al is used as the metal reflective layer. At least one of Cr, Cu and Al may be used in combination. However, when a metal reflection layer of high purity is sandwiched, it is suitable for enhancing the reflectance to produce a pearl feeling.

The thickness of the low refractive index material layer MgF ₂ is 25 times the thickness of the metal reflection layer.

In a specific example, the metal reflection layer has a thickness of 10 nm and the MgF ₂ thickness is 250 nm.

It is preferable to use a PVD or CVD method to laminate the substantial multilayer thin film.

 In the above, the simulation can be performed by changing various physical factors according to the layer of the multilayer thin film, and as a result, the implemented color can be found, recorded and stored in the color system.

That is, the present invention is based on the assumption that a multilayer coating film is formed by sandwiching a metal reflection layer between glass material layers and between glass material layers having a low refractive index on a glass, and a material for the multilayer coating film and thickness information And the simulation is executed to obtain the hue, brightness and chroma realized by the entire multilayer coating film formed on the glass substrate, the refractive index, the partition coefficient, the physical thickness and the optical thickness, Wherein the color of the decorative layer is determined based on the color of the decorative layer.

The CIE L * a * b * colorimetric system can be applied as a colorimetric system by calculating the reflectance of the visible light region through the multilayer thin film structure stacked on the glass substrate, and finding the hue on the colorimetric system.

In the above, the reflectance and the color change on the color system are searched by changing the thickness and composition of the metal reflection layer.

In the above, simulation can be performed by forming a comb pattern on a glass substrate on which a multilayer thin film is laminated by a lithography process, and stacking a multilayer thin film thereon.

It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.

No reference symbol.

Claims (7)

A pattern made of fine grooves is formed on the surface of the glass substrate at predetermined intervals,
The patterned glass substrate was slurried with an etching solution,
The slimming glass substrate is chemically reinforced,
Wherein the multilayer thin film is coated on a patterned tempered glass to realize a color. The method of claim 1, wherein the fine groove pattern formation is performed by a laser beam, a scribing, a water jet, or a sand blast. The method of claim 1, wherein the glass substrate is cut into several cell units before chemical strengthening after the slimming process. 2. The method of claim 1, wherein the slimming process dips or sprays the glass substrate to the etching solution. 2. The display device according to claim 1, wherein the fine grooved pattern includes fine grooves serving as decoration and fine grooves serving as a cell unit boundary line,
Wherein the fine groove pattern serving as a boundary line in the unit of the cell is formed into a groove that is deeper than the depth of the decoration fine groove.         6. The cover glass manufacturing method according to claim 5, wherein when the slimming process is completed, the substrate is cut in units of cells along fine grooves representing cell boundary lines to obtain a plurality of substrates for each cell. The method according to claim 1, wherein, assuming that a multilayer coating film sandwiched by a metal reflection layer is formed between the layers of the material having a low refractive index on a chemically reinforced glass substrate, information on the material and thickness of the multilayer coating film And the simulation is executed to obtain the hue, brightness or saturation realized by the entire multilayer coating film formed on the glass substrate, the refractive index, the partition coefficient, the physical thickness, and the optical thickness, thereby obtaining the hue to be seen with the naked eye And a color is detected.

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