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Classification of mobile phone lenses

2019-08-26
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1. Flat phone lens

Flat lenses are PMMA or PC lenses obtained by printing and CNC cutting. The main materials are PMMA and PC. If the hardness of the lens surface is not required to be high, even raw plate (unreinforced plate) can be directly used as the material of flat lens to reduce the cost.

PC: compared with PMMA, the impact toughness of PC is better, but there is still a gap with PMMA in other indexes, especially the surface hardness. After the surface hardening treatment, the hardness is only about Hb, and the lens is easy to be scratched in the use process. If the impact resistance of the lens is not high, it is recommended to use PMMA as the lens material.

PMMA: compared with PC, PMMA has a high transmittance of 92%. Good weather resistance, not easy to oxidize and crack. The surface hardness can be over h without hardening. After hardening, the hardness can be over 4H.

Plate: due to the thickness limitation of raw material plate, the common specifications (thickness) of PMMA plate materials are 0.64, 0.80, 1.0, 1.2 and 1.5mm. The thickness of the thinnest PMMA plate can reach 0.5mm, but with the decrease of the thickness of the plate, the mechanical strength will also be greatly reduced. Therefore, it is recommended to use plates with thickness of more than 0.8mm as lens materials.

PMMA sheet is uniform in thickness and size, without shrinkage and rainbow produced during strengthening. Optical properties are better than injection molding and IML. It is suitable for lenses with flat upper and lower surfaces, no back button, hot-melt column, etc. It is especially suitable for camera, flip the inner screen of mobile phone.


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2. IML mobile phone lens

IML lens is obtained by film printing, punching, molding and injection molding. The film materials of IML lens mainly include PC and pet.

At present, MTL adopts PET film, the transmittance of PET film can reach more than 89%, and the surface hardness can reach more than H. The film thickness range is usually 0.075 to 0.175.

Because the decorative pattern of the lens is printed on the film, the pattern looks like it is on the surface of the product, but it is not easy to be worn. In addition, after the injection molding, it can be printed on the back of the lens again, so that the decorative pattern on the lens has a sense of hierarchy.

The thickness and size of the lens are not uniform, and the lower surface is not smooth. It is hoped that the decorative pattern of the lens will have a sense of hierarchy, or IML lens technology is recommended when the reverse buckle and hot-melt column are used to connect with the shell.

3. Injection molded mobile phone lens

Injection molding lens is the lens obtained by injection molding, hardening, printing and trimming of PMMA and PC particles, and its materials mainly include PC and PMMA.

PC: the transmittance of PC is more than 88%, the lens has good toughness and impact resistance. However, its surface hardness is low, generally about 4B after injection molding, and only about HB after hardening treatment. Lenses are easy to be scratched during use.

PMMA: compared with PC, PMMA has a high transmittance of 93%. Good weather resistance, not easy to oxidize and crack. The surface hardness can be over h without hardening. After hardening, the hardness can be over 3H. After injection molding, the hardness of PMMA is higher than that of hardened PC. if the requirements for the hardness and impact performance of the lens surface are not high, the lens can be made directly without strengthening, so as to reduce the cost.


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