Patent ID: 9333624
Filing Date: 2016-05-10
CPC Classification: B24C

Claim Text:
1. A method for cutting out a hard-brittle substrate comprising: laying out a plurality of first protective films with blast resistant property having shapes corresponding to a plurality of substrate to be cut out on a plate material made of a hard-brittle material with leaving cutting regions required for cutting by blasting, and forming second protective films with blast resistant property on outer edges of the substrate with leaving the cutting regions, and covering a margin of the plate material with the second protective film so that an exposed width, which is not covered with the second protective film, on a peripheral portion located outer periphery on each of front and back surfaces of the plate material is equal to or less than 5 mm; Setting the cutting regions on the regions of which having no first and second protective films formed between the first protective films, and between the first protective film and the second protective film; Forming the first protective films and the second protective films on the front and back surfaces of the plate material at the same positions so as to opposite each other; and Cutting the cutting regions from either one surface of the plate material to a depth of approximately half of a plate thickness of the plate material, then cutting the cutting region from the other surface of the plate material until communicating with a cut portion from said one surface of the plate material.