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Methods for processing light shields and methods for manufacturing light shields

Release Date:

2020-10-31 11:48

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Methods for processing light shields and methods for manufacturing light shields

　　A method for treating the aforementioned light-shielding ring and the light-shielding ring itself, wherein the method comprises the following steps: providing a light-shielding ring, the light-shielding ring including a body, an antistatic coating applied to the body, and through-holes formed in the body; the body is made of a plastic material, and the antistatic coating is a carbon‑powder layer; and forming a matte structure on the inner walls of the through-holes by etching with an alkaline solution.

　　A method for treating an aperture stop, along with the aperture stop itself, involves processing the aperture stop in an ultrasonic bath containing an alkaline solution to form a matte surface on the walls of its through-holes. This prevents glare, lens flare, and ghosting caused by reflections from the hole walls, thereby ensuring superior imaging performance and enhancing the quality of video‑recording products.

　　In high‑resolution smartphones and digital cameras, the image sensor typically incorporates three to five aperture blades to control the effective aperture and suppress stray light. Traditionally, these were manufactured by metal stamping and then blackened through anodization to achieve complete light suppression; however, plastic aperture blades are several times more expensive.

　　In recent years, as costs have dropped significantly, manufacturers have switched to using polyethylene terephthalate (PET) raw material with an antistatic, high‑opacity coating, which is directly stamped to replace the previous method. However, as pixel densities continue to increase, the cross‑section of the internal cavities formed by plastic stamping leaves a shiny cut surface. Moreover, unlike metals, this material cannot undergo conventional blackening or matte finishing, leading to noticeable issues such as glare, halos, and ghosting (FLARE).

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