MANUFACTURING METHOD FOR CELL-UNIT GLASS SUBSTRATES
The present invention relates to a cell-unit glass substrate manufacturing method for manufacturing a plurality of cell-unit glass substrates from a glass substrate, wherein the method includes a deformation portion formation step, a protective film lamination step, a first etching step, a second etching step, and a substrate separation step.
1 . A cell-unit glass substrate manufacturing method for manufacturing a plurality of cell-unit glass substrates from a glass substrate, the method comprising:
a deformation portion formation step of forming a deformation portion along a cutting line by emitting a laser beam along the cutting line predefined on the glass substrate;
a protective film lamination step of laminating one surface of the glass substrate with a protective film to prevent etching of the one surface of the glass substrate having the deformation portion formed therein;
a first etching step of forming a through hole and a through surface in the glass substrate by etching the glass substrate laminated with the protective film to pierce the deformation portion;
a second etching step of forming an infiltration hole and an infiltration surface connected to the through hole and the through surface in the glass substrate by infiltrating an etching solution between the protective film lamination surface and the glass substrate once the deformation portion is pierced and the protective film lamination surface is exposed; and
a substrate separation step of separating the cell-unit glass substrates from the glass substrate having the through hole, the through surface, the infiltration hole, and the infiltration surface formed therein, wherein
the protective film lamination surface is etched at a faster rate than the glass substrate in the second etching step and
the protective film remains laminated to the one surface of the glass substrate throughout both the first etching step and the second etching step.
2 . A cell-unit glass substrate manufacturing method for manufacturing a plurality of cell-unit glass substrates from a glass substrate, the method comprising:
a protective film lamination step of laminating one surface of the glass substrate with a protective film to prevent etching of the one surface of the glass substrates;
a deformation portion formation step of forming a deformation portion along a cutting line by emitting a laser beam on the cutting line predefined on the glass substrate;
a first etching step of forming a through hole and a through surface in the glass substrate by etching the glass substrate laminated with the protective film to pierce the deformation portion;
a second etching step of forming an infiltration hole and an infiltration surface connected to the through hole and the through surface in the glass substrate by infiltrating an etching solution between the protective film lamination surface and the glass substrate once the deformation portion is pierced and the protective film lamination surface is exposed; and
a substrate separation step of separating the cell-unit glass substrates from the glass substrate having the through hole, the through surface, the infiltration hole, and the infiltration surface formed therein, wherein
the protective film lamination surface is etched at a faster rate than the glass substrate in the second etching step and
the protective film remains laminated to the one surface of the glass substrate throughout both the first etching step and the second etching step.
3 . The method of claim 1 , wherein the infiltration speed at which the etching solution infiltrates between the protective film lamination surface and the glass substrate slows down as an adhesive force between the glass substrates and the protective film becomes stronger.
4 . The method of claim 1 , wherein through surface inclination orientation in which the through surface is formed at an inclination and infiltration surface inclination orientation in which the infiltration surface is formed at an inclination are opposite to each other.
5 . The method of claim 1 , wherein a portion where the through surface meets the infiltration surface is defined as a crossing portion, wherein
the horizontal length of the through hole from the end of the through hole to the crossing portion is less than the horizontal length of the infiltration hole from the end of the infiltration hole to the crossing portion and
the vertical length of the through hole from the end of the through hole to the crossing portion is equal to or greater than the vertical length of the infiltration hole from the end of the infiltration hole to the crossing portion.
6 . The method of claim 1 , wherein
a through surface angle is formed between the through surface and the other surface of the glass substrate, and
an infiltration surface angle is formed between the infiltration surface and the one surface of the glass substrate laminated with the protective film, wherein
the through surface angle is greater than the infiltration surface angle.
7 . The method of claim 1 , wherein the through surface is formed in a straight-line shape and the infiltration surface is formed in a round shape.
8 . The method of claim 2 , wherein the infiltration speed at which the etching solution infiltrates between the protective film lamination surface and the glass substrate slows down as an adhesive force between the glass substrates and the protective film becomes stronger.
9 . The method of claim 2 , wherein through surface inclination orientation in which the through surface is formed at an inclination and infiltration surface inclination orientation in which the infiltration surface is formed at an inclination are opposite to each other.
10 . The method of claim 2 , wherein a portion where the through surface meets the infiltration surface is defined as a crossing portion, wherein
the horizontal length of the through hole from the end of the through hole to the crossing portion is less than the horizontal length of the infiltration hole from the end of the infiltration hole to the crossing portion and
the vertical length of the through hole from the end of the through hole to the crossing portion is equal to or greater than the vertical length of the infiltration hole from the end of the infiltration hole to the crossing portion.
11 . The method of claim 2 , wherein
a through surface angle is formed between the through surface and the other surface of the glass substrate, and
an infiltration surface angle is formed between the infiltration surface and the one surface of the glass substrate laminated with the protective film, wherein
the through surface angle is greater than the infiltration surface angle.
12 . The method of claim 2 , wherein the through surface is formed in a straight-line shape and the infiltration surface is formed in a round shape.