Claims
- 1. A method for making a lens molding die comprising the steps of:
(a) providing a master die having a reference surface, the reference surface being equivalent to a lens surface that is to be molded by the lens molding die; (b) forming an SiC film on the reference surface; (c) bonding a die base member onto the SiC film, said die base member and said SiC film constituting the lens molding die; and (d) separating the lens molding die from the master die.
- 2. The method as claimed in claim 1, further comprises a step of forming a separating film on the master die between the step (a) and the step (b).
- 3. The method as claimed in claim 2, wherein the separating film is a carbon film.
- 4. The method as claimed in claim 3, wherein the carbon film is formed by PVD method.
- 5. The method as claimed in claim 3, further comprises a step of removing the carbon film by ashing after the step (d).
- 6. The method as claimed in claim 2, wherein the separating film is a metallic film that can be etched.
- 7. The method as claimed in claim 1, further comprises steps of machining a surface of the die base member into a prescribed shape and machining the SiC film into a shape in conformity of the surface of the die base member between the step (b) and the step (c).
- 8. The method as claimed in claim 1, wherein the SiC film and the die base member are bonded to each other via a ceramic adhesive or a carbon adhesive.
- 9. The method as claimed in claim 1, wherein the SiC film is formed by CVD method.
- 10. The method as claimed in claim 1, wherein the master die is made of SiC or a hard metal including mainly WC.
- 11. The method as claimed in claim 1, wherein the master die is made of grassy carbon.
- 12. The method as claimed in claim 1, wherein the die base member is made of any one of SiC, Si3N4, a cermet, or a hard metal including mainly WC.
- 13. The method as claimed in claim 1, wherein a reference surface of the master die is convex shape.
- 14. The method as claimed in claim 13, wherein a maximum peripheral inclination angle of the reference surface is 50 degrees or more.
- 15. The method as claimed in claim 3, further comprises a step of machining an upper surface and/or a side surface of the die base member with reference to a bottom surface of the master die between the step (c) and the step (d).
- 16. A method for manufacturing a plurality of lenses comprising the steps of:
(a) providing a master die having a reference surface, the reference surface being equivalent to a lens surface that is to be molded by the lens molding die; (b) forming an SiC film on the reference surface; (c) bonding a die base member onto the SiC film, said die base member and said SiC film constituting the lens molding die; (d) separating the lens molding die from the master die; (e) molding a lens material between an upper die and a lower die under pressure, at least one of the upper die and the lower die being the lens molding die, wherein a plurality of lenses are manufactured by repeating the step (e).
- 17. The method as claimed in claim 16, wherein the lens material is a glass material, and wherein the step (e) further comprises the steps of:
(1) holding the glass material between the upper die and the lower die; (2) heating each of the glass material, the upper die and the lower die up to a prescribed temperature, before molding the lens.
- 18. The method as claimed in claim 16, wherein the lens material is a fused glass material, and wherein the step (e) further comprises the step of (1) dropping or placing the fused glass material on the lower die before molding the lens.
- 19. The method as claimed in claim 16, wherein the lens material is a plastic material and, in the step (e), the plastic material is injected and filled under pressure into a cavity enclosed by the upper die and the lower die.
- 20. The method as claimed in claim 16, further comprises a step of forming a separating film on the master die between the step (a) and the step (b).
Priority Claims (1)
Number |
Date |
Country |
Kind |
2003-157770 |
Jun 2003 |
JP |
|
Parent Case Info
[0001] This application is based on the application No. 2003-157,770 filed in Japan Jun. 3, 2003, the entire content of which is hereby incorporated by reference.