| 摘要 |
The present invention relates to a method for manufacturing an optical cover of a lighting apparatus, comprising: a pre-form injection step for injecting a pre-form to have partially different thicknesses depending on light distribution required for the lighting apparatus; and a stretching and blowing step for forming an undercut at the edge of the pre-form by stretching the pre-form with a stretching bar while spraying air into the pre-form. The present invention can more accurately control the thickness of an optical cover in accordance with the required light distribution by first injecting the pre-form, which is a temporary form, in a mold while varying thicknesses partially depending on the light distribution required for the lighting apparatus. |
