| 摘要 |
PURPOSE:To improve transferability of a molded surface and form a desired optical element easily by pinching a material to be processed composed of optical thermoplastic resin by upper and lower punches, heat softening the material to be processed while reverse phase vibration is applied to the upper and lower punched respectively and respective molded surfaces are transferred to the material to be processed while the intervals of respective molded surfaces are narrowed. CONSTITUTION:A spherical material 25 to be molded which is composed of thermoplastic resin is fed and placed on a molding surface 17a of a lower punch 17 and the material 25 to be molded is pinched by upper and lower punches 16 and 17. Guide components 23 and 24 are controlled to be brought into contact with each other, and upper and lower vibration actuators 3 and 4 are actuated to vibrate the upper and lower punches 16 and 17. At that time, vibration phases of the upper and lower punches 16 and 17 are reverse, and the material 25 to be molded is heat softened by vibration. During said vibration, the material 25 to be molded is pressurized through the upper and lower punches 16 and 17 wherein the interval is made narrow by means of pressure P generated by the upper and lower molding actuators 14 and 15. The shapes of the molding surfaces 16a and 17a of the upper and lower punches 16 and 17 are transferred to the material 25 to be molded. |
