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

Abstract

The invention discloses a method for manufacturing a Fresnel lens, a used injection molding die device and a prepared Fresnel lens. The manufacturing method includes an injection step, a rapid heating step of the mold core, a transfer printing step, and a rapid cooling molding step. The injection step includes injecting liquid thermoplastic material into at least one cavity in the Fresnel lens injection molding mold device. The step of rapidly heating the mold core includes injecting a high temperature fluid into the mold core waterway in at least one of the at least one pair of mold cores, so as to rapidly heat the mold core to a temperature at which the thermoplastic material can flow. The rapid cooling molding step is to inject low-temperature fluid into the mold core water channel of the mold core to rapidly cool the liquid thermoplastic material in the mold cavity and make it cool and solidify to form a Fresnel lens. Through the mold water channel, the injection molding mold device can be heated and cooled evenly and rapidly, avoiding local cooling and solidification of the plastic material, thereby improving the optical quality of the Fresnel lens.

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...

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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

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