Glass disk processing method
The present invention provides a method of easily chamfering and polishing an inner peripheral face and an outer peripheral face of a glass disk at low cost. By continuously supplying fresh etchants to an inner peripheral face and an outer peripheral face of a glass disk stacked body in which a plurality of glass disks are stacked, the inner and outer peripheral faces are polished.
1. A glass disk processing method of polishing an inner peripheral face and an outer peripheral face of a glass disk, comprising the steps of:
stacking glass disks about a rotary shaft for generating a glass disk stacked body in which a plurality of glass disks are stacked;
preparing an inner peripheral etchant and an outer peripheral etchant, each comprising a fluorinated acid based material;
continuously supplying the inner-peripheral etchant to the inner peripheral face of the glass disk stacked body via an inner space formed between said inner peripheral face and an outer peripheral face of the rotary shaft; and
continuously supplying the outer-peripheral etchant to the outer peripheral face of the glass disk stacked body,
wherein an etching rate of the inner-peripheral etchant and an etching rate of the outer-peripheral etchant are different from each other, and the etching rate of the inner-peripheral etchant is higher than the etching rate of the outer-peripheral etchant, and
wherein the difference in the etching rate between the inner-peripheral etchant and the outer-peripheral etchant is realized by at least one method selected from variation in density of the fluorinated acid of the inner-peripheral etchant and the outer peripheral etchant, variation in temperature of the inner-peripheral etchant and the outer peripheral etchant, and variation in the kind of an additive in the inner-peripheral etchant and the outer-peripheral etchant.
2. The glass disk processing method according to claim 1 , wherein the steps of supplying the etchants are carried out by a method including at least one of an immersion method, a shower spraying method, a jetting method, and a coating method.
3. The glass disk processing method according to claim 1 , wherein relative rotation is performed between the inner- and outer-peripheral etchants and the glass disk stacked body in the steps of supplying the etchants.
4. The glass disk processing method according to claim 3 , wherein the glass disk stacked body rotates around the rotary shaft in the steps of supplying the etchants.
5. The glass disk processing method according to claim 4 , wherein the rotary shaft passes through the inner face of the glass disk stacked body.
6. The glass disk processing method according to claim 4 , wherein the rotary shaft revolves or linearly-reciprocates.
7. A glass disk processing method of polishing an inner peripheral face and an outer peripheral face of a glass disk, comprising the steps of:
stacking glass disks about a rotary shaft for generating a glass disk stacked body in which a plurality of glass disks are stacked;
preparing an inner-peripheral etchant and an outer-peripheral etchant, each comprising a fluorinated acid based material;
continuously supplying the inner-peripheral etchant to the inner peripheral face of the glass disk stacked body via an inner space formed between said inner peripheral face and an outer peripheral face of the rotary shaft; and
continuously supplying the outer-peripheral etchant to the outer peripheral face of the glass disk stacked body,
wherein the inner-peripheral and outer-peripheral etchants differ with respect to at least one of the following properties: density of the fluorinated acid of the inner-peripheral etchant and the outer-peripheral etchant, temperature of the inner-peripheral etchant and the outer-peripheral etchant, and the kind of an additive used in the inner-peripheral etchant and the outer-peripheral etchant.
8. The glass disk processing method according to claim 7 , wherein the steps of supplying the etchants are carried out by a method including at least one of an immersion method, a shower spraying method, a jetting method, and a coating method.
9. The glass disk processing method according to claim 7 , wherein relative rotation is performed between the inner- and outer-peripheral etchants and the glass disk stacked body in the steps of supplying the etchants.
10. The glass disk processing method according to claim 9 , wherein the glass disk stacked body rotates around the rotary shaft in the steps of supplying the etchants.
11. The glass disk processing method according to claim 7 , wherein the rotary shaft passes through the inner face of the glass disk stacked body.
12. The glass disk processing method according to claim 10 , wherein the rotary shaft revolves or linearly-reciprocates.