Manufacturing method of Fresnel lens, used injection molding mold device and manufactured Fresnel lens

Abstract

The invention discloses a manufacturing method of a Fresnel lens, a used injection molding mold device and the manufactured Fresnel lens. The manufacturing method comprises steps of injection, rapid mold core heating, transfer and rapid cooling and molding. The injection step is to inject a liquid thermoplastic plastic material into at least one mold cavity in the Fresnel lens injection molding mold device. The rapid mold core heating step is to inject a high-temperature fluid into a mold core water path in at least one mold core in at least one pair of mold cores to rapidly heat the mold coreto the temperature at which the thermoplastic plastic material can flow. The rapid cooling and molding step is to inject a low-temperature fluid into the mold core water path of mold core to rapidlycool and solidify a liquid thermoplastic material in the mold cavity to form the Fresnel lens. The injection molding mold device can be uniformly and rapidly heated and cooled by the mold water path,local cooling and curing of the plastic material can be avoided, and the optical quality of the Fresnel lens can be improved.

Description

technical field [0001] The present invention relates to a kind of manufacturing method of Fresnel lens, used injection molding mold device and the obtained Fresnel lens, particularly relate to a kind of manufacturing method of the Fresnel lens that utilizes rapid cooling and rapid heating mold kernel, used during manufacturing Injection molding mold device and the obtained Fresnel lens. Background technique [0002] Fresnel lens, also known as threaded lens, is characterized by its optical characteristics of short focal length, and is more material-saving and lighter than ordinary lenses. Compared with earlier lens designs, Fresnel lenses are thinner, so they can transmit more light. Therefore, after the light source is refracted through the Fresnel lens, it can more effectively send light to the distance. [0003] Fresnel lenses are widely used in lighthouse projection navigation lights, projection projector lenses, rear projection display screens, and car headlights. It i...

AI Technical Summary

Problems solved by technology

[0007] In view of the existing injection molding mold machine and processing method for manufacturing Fresnel lenses, the uneven cooling and heating of various parts of the mold caused insufficient filling of the mold cavity during the injection molding process, resulting in the sawtooth portion of the finished Fresnel lens. Insufficient sharpness that affects the optical quality and other shortcomings, improve their shortcomings and shortcomings, and then create a method of manufacturing Fresnel lenses that uses rapid cooling and rapid heating of the mold core. The injection molding mold device used in the manufacture and the prepared Fresnel lens lens

Images