Aspheric Lens

Aspheric lens has better radius of curvature and can maintain good aberration correction to obtain the desired performance.The application of aspheric lens brings excellent sharpness and higher resolution, while the miniaturization of the lens is possible.

Aspheric lens, the radius of curvature varies with the center axis, to improve optical quality, reduce optical elements, reduce the design cost.Aspherical lens has unique advantages over spherical lens, so it has been widely used in optical instrument, image and optoelectronic industry, such as digital camera, CD player and high-end microscopic instrument.

Molding process

A precision glass molding

Precision glass molding is to heat the glass material to a high temperature to become plastic, through the aspheric mold to shape, and then gradually cool to room temperature.At present, precision glass molding is not suitable for aspheric lens with diameter greater than 10mm.But new tools, optical glass and metering processes are all driving the technology.Precision glass molding, although at the beginning of the design cost is high (high precision mold development), but after mold molding, the production of high quality products can be amortized out of the early development cost, especially suitable for mass production occasions.

B. Precision polishing

Grinding and polishing are generally suitable for producing single aspheric lens at one time.Most notably, precision polishing is controlled by a computer and automatically adjusted to optimize parameters.If higher quality polishing is required, the magneto-rheological inspector will be used.Compared with standard polishing, magnetorheological polishing has higher performance and shorter time.Precision polishing, which requires professional equipment, is currently the first choice for sample making and small batch samples.

C mixed forming

An aspherical body with a spherical lens as the substrate, die-cast on the surface of the spherical lens by an aspherical mold and a layer of molecular polymer on the surface of the spherical lens by ultraviolet curing.Mixed forming, generally using achromatic spherical lens as the base, the surface die-cast a layer of aspheric surface, in order to achieve the simultaneous elimination of chromatic aberration and spherical aberration.FIG. 7 shows the manufacturing process of hybrid aspheric lens.Hybrid aspheric lens, suitable for mass production where additional characteristics are required to eliminate both chromatic aberration and spherical aberration.

D injection molding

In addition to the glass aspherical lens, there are also plastic aspherical lenses.Plastic molding is the injection of molten plastic into an aspheric mold.Compared with glass, plastic has poor thermal stability and compressive resistance, and special treatment is needed to obtain a similar aspheric lens.However, the biggest characteristic of plastic aspheric lens is low cost, light weight, easy to shape, widely used in moderate optical quality, thermal stability is not sensitive, resistance to pressure is not big occasions.

Specifications

Aspheric Lens	Material	Size（mm）	Surface Error	High Precision Surface error	Surface Quality	High Precision Surface Quality	Center deviation


	Si、Ge、Al、Cu	5~200	PV<0.2μm, RMS<0.02μm	PV<0.15μm, RMS<30nm	Ra<5nm	Ra<3nm	≤1'
	Chalcogenide Glass, Crystal, Plastic		PV<0.2μm, RMS<0.02μm	PV<100nm, RMS<20nm	Ra<3nm	Ra<0.5nm
	Optical Glass, Quartz Glass, Sapphire, etc.		PV<0.2μm, RMS<0.02μm	PV<100nm, RMS<20nm	Ra<3nm	Ra<0.5nm
PS: Provide various coating solutions.

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