Abstract
In injection molding of an optical disk, toric lens, and so forth, their quality depends on the preciseness of the transcription of a minute structure on a mold surface. However, the transcription mechanism has not yet been clarified, because transcription is carried out in a very short time and the structure is very small, hi this paper, transcription properties have been examined using V-grooves of various sizes, machined on mold surfaces, and the following results are obtained. (1) Transcription properties have been clarified. (2) Transcription height changes with compression time tc, when tc is short. Therefore, tc should be more than 2.0s for fine transcription. (3) A mechanical model of the transcription process, in consideration of the strain recovery due to the viscoelasticity the property of polymer, is proposed. (4) Simulation results agree fairly well with experimental ones, indicating that the proposed transcription model is useful for brief estimation of the transcription properties prior to an actual injection molding trial.
