Separating apparatus and separating method
A separating apparatus includes a sucking plate for sticking to a support plate by suction. The sucking plate has sucking holes for expelling gas from a space between the sucking plate and the support plate. Each of the sucking holes has a diameter of not less than 0.3 mm and not more than an outer diameter of the support plate. This makes it possible to separate a supporting plate from a wafer without breaking the wafer.
1. A separating apparatus for separating a supporting plate from a substrate to which the supporting plate has been attached, comprising:
a sucking device configured to stick to the supporting plate by suction, and form a space therebetween, the supporting plate having a plurality of through holes passing therethrough in a thickness direction thereof,
said sucking device having an opening via which gas is capable of being expelled from the space between said sucking device and the supporting plate,
said opening having a diameter of not less than 0.3 mm and not more than an outer diameter of the supporting plate;
a gas supply means for supplying gas into a space between the supporting plate and the substrate via the through holes;
wherein said opening via which gas is capable of being expelled is disposed in a position so as to overlap with at least one of said plurality of through holes of said supporting plate while gas is being supplied into the space between the supporting plate and the substrate with said gas supply means; and
wherein said sucking device is configured to hold said supporting plate by a sucking force which is caused by expelling gas from a space between said sucking device and said supporting plate.
2. The separating apparatus as set forth in claim 1 , wherein said opening has a diameter of not less than 0.3 mm and not more than 20 mm.
3. The separating apparatus as set forth in claim 1 , wherein said opening in said sucking device is one of a plurality of openings.
4. The separating apparatus as set forth in claim 1 , wherein said gas supply means starts supplying gas after or at the same time as said sucking device sticks to the supporting plate by suction.
5. The separating apparatus as set forth in claim 1 , further comprising a dissolving liquid supply device configured to supply a dissolving liquid into the space between the supporting plate and the substrate via the through holes.
6. The separating apparatus as set forth in claim 1 , further comprising a clamp configured to grip an outer peripheral end of the supporting plate.
7. The separating apparatus as set forth in claim 1 , wherein said gas supply means includes a gas inlet that is separate from said opening.
8. The separating apparatus as set forth in claim 7 , wherein said opening is disposed on a surface of said sucking device opposite a surface of said sucking device configured to stick to the supporting plate, and said gas inlet is disposed on a side surface of said sucking device.