Review of small aspheric glass lens molding technologies

doi:10.1007/s11465-017-0417-2

Front. Mech. Eng.

2017, Vol. 12

Issue (1) : 66-76 https://doi.org/10.1007/s11465-017-0417-2

REVIEW ARTICLE

Review of small aspheric glass lens molding technologies

Shaohui YIN¹(

),Hongpeng JIA¹,Guanhua ZHANG¹,Fengjun CHEN¹,Kejun ZHU²

¹. National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha 410082, China
². School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China

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Abstract

Aspheric lens can eliminate spherical aberrations, coma, astigmatism, field distortions, and other adverse factors. This type of lens can also reduce the loss of light energy and obtain high-quality images and optical characteristics. The demand for aspheric lens has increased in recent years because of its advantageous use in the electronics industry, particularly for compact, portable devices and high-performance products. As an advanced manufacturing technology, the glass lens molding process has been recognized as a low-cost and high-efficiency manufacturing technology for machining small-diameter aspheric lens for industrial production. However, the residual stress and profile deviation of the glass lens are greatly affected by various key technologies for glass lens molding, including glass and mold-die material forming, mold-die machining, and lens molding. These key technical factors, which affect the quality of the glass lens molding process, are systematically discussed and reviewed to solve the existing technical bottlenecks and problems, as well as to predict the potential applicability of glass lens molding in the future.

Keywords aspheric glass lens mold-die manufacturing lens molding molding process simulation

Corresponding Author(s): Shaohui YIN

Just Accepted Date: 14 December 2016 Online First Date: 09 January 2017 Issue Date: 21 March 2017

Cite this article:

Shaohui YIN,Hongpeng JIA,Guanhua ZHANG, et al. Review of small aspheric glass lens molding technologies[J]. Front. Mech. Eng., 2017, 12(1): 66-76.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-017-0417-2
https://academic.hep.com.cn/fme/EN/Y2017/V12/I1/66

Fig.1 Glass properties change with temperature

Fig.2 Strain response of glass under the constant stress.

(a) Constant stress of glass; (b) strain response of glass

Fig.3 WC mold-die

Fig.4 ELID grinding.

(a) Schematic diagram; (b) structure diagram of nozzle-type ELID grinding

Fig.5 Nozzle-type ELID grinding of micro aspherical mold-die.

(a) Aspheric WC; (b) surface roughness Ra 12.7 nm

Fig.6 Parallel grinding.

(a) Schematic diagram; (b) structure diagram

Fig.7 Inclined axis grinding.

(a) Schematic diagram; (b) structure diagram

Fig.8 Ultra-precision processing of micro aspherical mold-die.

(a) WC mold-die; (b) third times compensation, P-V 122 nm; (c) structure diagram; (d) surface roughness Ra 1.8 nm

Fig.9 Inclined axis magnetorheological finishing.

(a) Schematic diagram; (b) structure diagram; (c) after finishing; (d) surface roughness Ra 0.7 nm

Fig.10 Ultrasonic aspherical polishing device.

(a) Structure diagram; (b) schematic diagram (NC is numerical control, PC is personal computer)

Fig.11 Integrated machining.

(a) Sketch of combined processing; (b) view of combined processing equipment; (c) Ra 1.447 nm, rms 1.82 nm after grinding; (d) Ra 0.773 nm, rms 0.987 nm after polishing

Fig.12 Molding steps

Fig.13 Forming glass lens.

(a) Small aspheric glass lens; (b) P-V 118 nm, rms 22 nm

Fig.14 Contour offset prediction and correction.

(a) Contour offset prediction of forming lens; (b) contour curve correction of mold-die (partial view)

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