Patent ID: 11905200
Assignee: JINWOO ENGINEERING CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method of manufacturing a window-glass having a print pattern for a smartphone camera, comprising:
a cell-cutting line fabrication process 100 for forming cell-cutting lines 31 on a glass disk 11 for cell separation; a sheet cutting process 200 for cutting the glass disk 11 into units of sheets consisting of a large number of glass cells 13 by a laser; a sheet tempering process 300 for increasing a surface stress of a glass sheet 12 by potassium nitrate and allowing the cell-cutting lines 31 to be clearly formed; a print pattern formation process 400 for forming a pattern on the window-glass through printing; an AR deposition process 500 for forming an AR deposition layer 51 to increase transmittance and reduce reflectance in a rear transmission area of each glass cell 13; an AF deposition process 600 for forming an AF deposition layer 52 on a front portion of each glass cell 13 to prevent fingerprint and foreign matter contamination; and a cell separation process 700 for separating cells along the cell-cutting lines 31 by pushing the glass cells 13 in units of sheets up or down,
wherein the glass disk 11 uses a half-tempered glass disk 11 that is tempered to have a surface stress of 500 to 600 MPa, a tempered depth of 10 to 30 μm, and a central stress of 50 to 90 MPa through a preheating process using hot air at 250±20° C. for 30 min±10 min, then a main heating process in KNO3 (potassium nitrate) at 420±20° C. for 100 min±20 min, and then a process of slow cooling using hot water at 150±20° C. for 15 minutes±5 minutes,
wherein the cell-cutting line fabrication process 100 comprises: a cell-cutting DFR double-side lamination step 110 for laminating a dry film photoresist (DFR) that is developed so that only a portion with cell-cutting lines 31 formed thereon of a glass disk 11 is exposed by photoreaction on both sides of the glass disk 11; a cell-cutting exposure step 120 for irradiating ultraviolet rays by way of a photomask 21 according to the cell-cutting lines 31 designed on both of upper and lower surfaces of the glass disk 11 laminated with the DFR through the cell-cutting DFR double-side lamination step 110; a cell-cutting pre-bake step 130 for pressing and close-contacting to prevent the DFR from being lifted during a development and etching process by making the DFR closely contact with the glass disk 11; a cell-cutting development step 140 for removing the DFR, by development, that has not been exposed to the ultraviolet rays through the cell-cutting exposure step 120; a cell-cutting hard-break step 150 for pressing the DFR weakened by the development through the cell-cutting development step into close contact with the glass disk 11; a laser cell-cutting line fabrication step 160 for forming cell-cutting lines having a predetermined depth with a laser on a surface for formation of the cell-cutting lines 31 of the glass disk 11 exposed through the cell-cutting development step 140; a cell-cutting glass etching step 170 for forming cell-cutting grooves by corroding with an etching solution a surface on which the cell-cutting lines 31 are formed, which are exposed through the laser cell-cutting line fabrication step 160; a cell-cutting DFR peeling step 180 for removing, with a peeling solution, the DFR remaining on the glass disk 11 after the cell-cutting glass etching step 170; and a cell-cutting healing step 190 for homogenizing surfaces by completely etching the glass disk 11 within 2 minutes in an etching solution of low-concentration,
wherein the cell-cutting healing step 190 is performed by healing and etching an entire surface of the glass disk 11 in a low hydrofluoric acid etching solution prepared by mixing a hydrofluoric acid mixture in an amount of 3 to 15% by weight, so as to increase strength and improve an exterior quality by improving coarseness of an etching area formed coarsely in the cell-cutting glass etching step 170,
wherein a medium-sensitivity DFR is used for the upper surface and a low-sensitivity DFR is used for the lower surface in the cell-cutting DFR double-side lamination step 110, so as to prevent excessive exposure of a lower DFR layer that is subject to continuous exposure in the cell-cutting exposure step that is a subsequent step,
wherein an etching pattern fabrication process 900 for forming an etching pattern on the front portion of the glass cell 13 is carried out before or after the cell-cutting line fabrication process 100, and
wherein the etching pattern fabrication process 900 comprises: an etching pattern DFR double-side lamination step 910 for laminating a dry film photoresist (DFR) that is developed so that only a portion with an etching pattern formed thereon of the glass disk 11 is exposed by photoreaction on both sides of the glass disk 11; an etching pattern front-surface irradiation step 920 for irradiating ultraviolet rays by way of the photomask 21 according to the etching pattern designed on both of the upper and lower surfaces of the glass disk 11 laminated with the DFR through the etching pattern DFR double-side lamination step 910; an etching pattern pre-bake step 930 for pressing and close-contacting to prevent the DFR from being lifted during a development and etching process by making the DFR closely contact with the glass disk 11; an etching pattern development step 940 for removing the DFR, by development, that has not been exposed to the ultraviolet rays through the etching pattern front-surface irradiation step 920; an etching pattern hard-break step 950 for pressing the DFR weakened by the development through the etching pattern development step 940 into close contact with the glass disk 11; an etching pattern glass etching step for forming the cell-cutting lines 31 by corroding with an etching solution a surface of the glass disk 11 on which the etching pattern is formed, which is exposed through the etching pattern development step 940; and an etching pattern DFR peeling step 970 for removing, with a peeling solution, the DFR remaining on the glass disk 11 after the etching pattern glass etching step.