Effect of non-contact preheating on fog spots of molded infrared lenses
When the aspheric infrared lens is molded,the lens press-cutting time can be shortened by increasing the temperature of the molding stage,thus improving the molding efficiency.However,it is easy to produce the fog spots on the lens surface,like a bad lens.Through the analysis of the formation mechanism of lens fog spots,a non-contact preheating molding process was adopted to reduce the formation of it,and the molding experiments were carried out on a multi-station molding press,in which the elements of fog spots were detected and analyzed by using an energy spectrometer.In this molding experiment,the non-contact preheating method was used to increase the molding temperature from 206℃to 211℃when the preheating gap was 1 mm,with no fog spots formed on the lens surface,and the press-cutting time was shortened by 21 s.The results show that the non-contact preheating method in the multi-station molding press can effectively eliminate the formation of lens fog spots.The test results show that the volatilization of the lens material in the molding stage plays a dominant role in the formation of fog spots.
asphericinfrared lenscompression moldingpreheating pressurelens fog spots
NETL
NSTL
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