Lens manufacturing apparatus
View Patent ↗A lens manufacturing apparatus includes a conveying unit that conveys a workpiece having a sheet member and a resin base on the sheet member, an unevenness forming unit that moves a cutting blade in a direction different from the conveying direction of the workpiece and that makes a cut in the surface of the resin base to form concave and convex portions, a resin supply unit that includes nozzles supplying a lens resin to areas, in which the concave portions are not formed, between the convex portions formed on the surface of the resin base, and a resin curing unit that cures the supplied lens resin.
1. A lens manufacturing apparatus comprising:
a conveying unit that conveys a workpiece comprising a sheet member and a resin base on the sheet member;
an unevenness forming unit that moves one or a plurality of cutting blades in a direction different from the conveying direction of the workpiece and that makes a cut in a surface of the resin base, wherein the resin base, as a result of the cut by the unevenness forming unit, includes concave portions, convex portions and areas, each of the areas being disposed between two neighboring convex portions of the convex portions, the convex portions not being formed on the areas;
a resin supply unit that has nozzles supplying a lens resin to the areas whereby the supplied resin forms a convex shape; and
a resin curing unit that cures the supplied lens resin,
wherein the unevenness forming unit and the resin supply unit are formed with a same working head.
2. The lens manufacturing apparatus according to claim 1 , wherein the following expression is satisfied:
N− 1 ≧VT/W,
where N represents a number of the plurality of cutting blades, W represents the pitch (mm) of the cutting blades, V represents a conveyance velocity (mm/s) of the conveying unit, and T represents the time (s) in which the unevenness forming unit causes the cutting blades to once reciprocate over the width of the resin base.
3. The lens manufacturing apparatus according to claim 1 , wherein a movement velocity of the cutting blade and a conveyance velocity of the workpiece are controlled so that the direction of the cutting blade is substantially perpendicular to the conveying direction of the workpiece.
4. The lens manufacturing apparatus according to claim 1 , wherein the conveying unit includes a workpiece rotating unit that rotates the workpiece to control the direction of the cut made with the cutting blade.
5. The lens manufacturing apparatus according to claim 1 , wherein the resin supply unit has an ejection driving unit that controls the supply of the lens resin, the ejection driving unit stops the supply of the lens resin from the nozzles located outside the areas between the convex portions formed on the surface of the resin base out of the nozzles.
6. The lens manufacturing apparatus according to claim 1 , wherein the unevenness forming unit includes a plurality of linear blades.
7. The lens manufacturing apparatus according to claim 1 , wherein the unevenness forming unit includes a plurality of needle-like blades.
8. The lens manufacturing apparatus according to claim 1 , wherein the resin curing unit is an ultraviolet irradiation device.
9. The lens manufacturing apparatus according to claim 1 , further comprising:
a resin base forming unit that forms the resin base.
10. The lens manufacturing apparatus according to claim 9 , wherein the resin base forming unit includes a base resin supply unit and a base resin curing unit.
11. The lens manufacturing apparatus according to claim 1 , wherein the unevenness forming unit moves the one or a plurality of cutting blades in a direction substantially perpendicular to or inclined by a predetermined angle about a direction perpendicular to the conveying direction of the workpiece.
12. The lens manufacturing apparatus according to claim 1 , wherein each of the cutting blades has a linear shape and is supported in a direction forming an angle about the moving direction of the unevenness forming unit.