Method for the production of glass product
AssigneeHoya Corporation
InventorHironori Oguma
Life of this patent
Estimating the term…
Abstract
Glass surfaces are produced having a highly polished surface by polishing with a glass polishing liquid having a pH approximating the pH of the glass being polished. The method provides highly polished, smooth, highly accurate glass surfaces suitable for use optical filters and solid camera devices and solid image sensors. Phosphate and fluorophosphate glass filters and the like so formed have hair-like surface flaws, if any, of a width of 7 μm or less.
Claims7
A method for the production of a glass product, which comprises allowing the pH of a polishing liquid to approximate to the pH of glass of which the surface is to be polished with the polishing liquid, and then polishing the glass surface with the polishing liquid.
A method of producing a phosphate or fluorophosphate glass filter having a smooth surface which comprises selecting a polishing liquid to have a pH approximating the pH of the glass whose surface is to be polished with the polishing liquid, and then polishing the glass surface to provide a glass filter having a smooth surface and any flaws having a width of at most 7 μm.
A method of producing a filter, which comprises the steps of:
- (a) polishing a surface of a glass with a polishing liquid, wherein the polishing comprises allowing the pH of the polishing liquid to approximate the pH of the glass of which the surface is to be polished with the polishing liquid, and then
- (b) polishing the surface of the glass with the polishing liquid.
Dependencies are inferred from the claim text.