Laser lens

Ø Forming technology of aspheric lens

u a Precision glass molding

Precision glass molding is to heat the glass material to high temperature and become plastic. It is formed by an aspheric mold and then gradually cooled to room temperature. At present, precision glass molding is not suitable for an aspheric lens with a diameter greater than 10 mm. However, new tools, optical glass, and measurement processes are all promoting this technology's development. Although the cost of precision glass molding is high in the early stage of design (high-precision mold development). after mold forming, the high-quality products produced can spread out the development cost in the early stage, especially suitable for mass production occasions.

u bPrecision polishing forming

    Grinding and polishing are generally suitable for the production of a single aspheric lens at one time. With the improvement of technology, its precision is higher and higher. Most notably, precision polishing is controlled by a computer and automatically adjusted to achieve parameter optimization. If higher quality polishing is needed, magnetorheological finishing (MRF) will be used. Compared with standard polishing, MRF polishing has higher performance and shorter time. Precision polishing requires professional equipment, which is the first choice for sample making and a small batch of samples.

u c Hybrid molding

   The spherical lens's aspherical surface is die-cast by the aspherical mold based on the spherical lens, and a layer of high polymer is cured by UV light. In the hybrid forming, the achromatic spherical lens is generally used as the base. A layer of aspheric surface is die-cast on the surface to eliminate the chromatic aberration and spherical aberration. Fig. 7 is the manufacturing process of the hybrid aspheric lens. The hybrid aspherical lens is suitable for mass production with additional characteristics (eliminating color and spherical aberration at the same time).

u d injection molding

    In addition to the glass aspheric lens, there is a plastic aspheric lens. Plastic molding is the injection of molten plastic into an aspheric mold. Compared with glass, plastic has poor thermal stability and compression resistance, so it needs special treatment to obtain a similar aspheric lens. However, the plastic aspheric lens is characterized by low cost, lightweight, and easy to form, widely used in occasions with moderate optical quality, insensitive thermal stability, and low-pressure resistance. (article from visual life)
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