1. A method of shaping an aspherical optical element, the method comprising the following steps:
fastening an optical element blank to a ring to which arms are fastened, the optical element blank presenting two main surfaces which are:
an optical surface that is to be shaped and that is a front surface; and
an opposite surface referred to as a rear surface;
applying forces and moments to the ring by said arms in order to deform said ring in controlled manner, and also deform in controlled manner the blank and its optical surface, which blank is fastened to the ring;
using abrasion to shape said deformed optical surface, as to restore it to a shape that is spherical or planar; and
extracting the blank from the ring so as to release the stresses deforming said optical surface that has been shaped by abrasion so as to enable said surface to acquire the desired aspherical shape;
wherein the method includes the step of fastening the blank to the ring is performed by bonding one of said main surfaces of the blank on a surface of the ring that is parallel thereto and that faces it, by means of a layer of adhesive.
2. A method according to claim 1, wherein the fastening step comprises applying adhesive to the blank for which the perimeter(s) of the main surface isare different from the inside perimeter of the ring.
3. A method according to claim 1, wherein said arms are fastened to a plurality of surfaces of the ring that are perpendicular to the layer of adhesive.
4. A method according to claim 1, wherein said arms are fastened to a surface of the ring that is parallel to the layer of adhesive.
5. A method according to claim 1, wherein the blank is fastened to a ring that possesses a shoulder that is on the inside of the ring and that is fastened to the blank.
6. A method according to claim 1, wherein the ring possesses a protuberance on its periphery in order to recenter the neutral axis of the section of the ring onto the neutral axis of the blank.
7. A method according to claim 1, wherein only the periphery of one of the main surfaces of the blank is adhesively bonded to the ring.
8. A method according to claim 1, wherein the blank is fastened to the ring so as to make their axes of circular symmetry coincide.
9. A method according to claim 1, wherein the ring is made of the same material as the blank.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for manufacturing an inkjet recording medium comprising the steps of: applying a coating color containing a pigment and a binder as major components to at least one side of a base material using a transfer roll coater; subsequently drying said coating layer to form an ink absorbing layer, wherein Hercules viscosity of said coating color is 5 mPa\xb7s to 30 mPa\xb7s and said pigment contains a synthetic silica having an oil absorption of 90 ml100 g to 200 ml100 g, a BET specific surface area of 45 m2g to 200 m2g and an average particle diameter of 1.0 \u03bcm to 3.0 \u03bcm andor a precipitated calcium carbonate-silica composite having an oil absorption of 100 ml100 g to 250 ml100 g, a BET specific surface area of 5 m2g to 150 m2g and an average particle diameter of 1.0 \u03bcm to 10 \u03bcm.
2. The method described in claim 1 wherein said synthetic silica is obtained by wet grinding a synthetic silica slurry obtained by neutralizing an aqueous sodium silicate solution using a mineral acid andor an aqueous acidic metal salt solution.
3. The method described in claim 2 wherein said synthetic silica is obtained by neutralizing an aqueous sodium silicate solution using an aqueous aluminum sulfate solution.
4. The method described in claim 1 wherein said precipitated calcium carbonate-silica composite is obtained by mixing a precipitated calcium carbonate with an aqueous alkaline metal silicate solution and adjusting pH of said mixed solution to 7-9 by adding a mineral acid at a temperature below the boiling point of said mixed solution.
5. The method described in claim 1 wherein the ratio by weight for precipitated calcium carbonatesilica in said precipitated calcium carbonate-silica composite is 3070 to 7030 in terms of solid content.
6. The method described in claim 2 further comprising the step of adding said synthetic silica obtained by wet grinding said synthetic silica slurry andor said precipitated calcium carbonate-silica composite obtained by adjusting said pH to said coating color without proceeding through a drying step.
7. The method described in claim 1 wherein said pigment contains said synthetic silica andor said precipitated calcium carbonate-silica composite and a precipitated calcium carbonate having an average particle diameter of 0.2 \u03bcm to 1.0 \u03bcm.
8. The method described in claim 1 wherein said transfer roll coater is a gate roll coater.
9. The method described in claim 1 wherein the coating weight of said ink absorbing layer per one side is 2 gm2 to 7 gm2.
10. The method described in claim 1 wherein said coating color contains a cationic resin.
11. The method described in claim 4 wherein the ratio by weight for precipitated calcium carbonatesilica in said precipitated calcium carbonate-silica composite is 3070 to 7030 in terms of solid content.
12. The method described in claim 11 further comprising the step of adding said synthetic silica obtained by wet grinding said synthetic silica slurry andor said precipitated calcium carbonate-silica composite obtained by adjusting said pH to said coating color without proceeding through a drying step.
13. The method described in claim 3 further comprising the step of adding said synthetic silica obtained by wet grinding said synthetic silica slurry andor said precipitated calcium carbonate-silica composite obtained by adjusting said pH to said coating color without proceeding through a drying step.
14. The method described in claim 4 further comprising the step of adding said synthetic silica obtained by wet grinding said synthetic silica slurry andor said precipitated calcium carbonate-silica composite obtained by adjusting said pH to said coating color without proceeding through a drying step.
15. The method described in claim 5 further comprising the step of adding said synthetic silica obtained by wet grinding said synthetic silica slurry andor said precipitated calcium carbonate-silica composite obtained by adjusting said pH to said coating color without proceeding through a drying step.
16. The method described in claim 2 wherein said pigment contains said synthetic silica andor said precipitated calcium carbonate-silica composite and a precipitated calcium carbonate having an average particle diameter of 0.2 \u03bcm to 1.0 \u03bcm.
17. The method described in claim 3 wherein said pigment contains said synthetic silica andor said precipitated calcium carbonate-silica composite and a precipitated calcium carbonate having an average particle diameter of 0.2 \u03bcm to 1.0 \u03bcm.
18. The method described in claim 2 wherein said transfer roll coater is a gate roll coater.
19. The method described in claim 2 wherein the coating weight of said ink absorbing layer per one side is 2 gm2 to 7 gm2.
20. The method described in claim 2 wherein said coating color contains a cationic resin.