Review on Fabrication Technologies for Optical Mold Inserts

Roeder, Marcel; Guenther, Thomas; Zimmermann, André

doi:10.3390/mi10040233

Cited by 52 publications

(23 citation statements)

References 151 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…b respectively. The caliber radius r i of the i-th circle surface can be calculated by Equation (2). In order to realize the ultra-precision grinding of Fresnel micro-structured mold, the parallel grinding mode is chosen and a diamond grinding wheel with a sharp edge is used, as shown in Figure 2.…”

Section: Kinematical Analysis Of the Parallel Grinding Processmentioning

confidence: 99%

See 1 more Smart Citation

Suppression of Surface Waviness Error of Fresnel Micro-Structured Mold by Using Non-Integer Rotation Speed Ratio in Parallel Grinding Process

et al. 2020

View full text Add to dashboard Cite

Fresnel micro-structured lenses are widely used in the field of modern optoelectronic technology. High-precision Fresnel micro-structured mold is the key technology to achieve its large-scale replication production. Focusing on the surface waviness error of Fresnel micro-structured mold machined by parallel grinding process, this paper conducted theoretical modeling and experiment research. Based on the grinding kinematics theory, the simulation models of the surface waviness topography and the circular waviness profiles of the ground Fresnel micro-structured mold were developed, considering the combined influence of the non-integer rotation speed ratio and other grinding parameters. A series of grinding experiments were carried out to verify the proposed simulation models. The influence of a non-integer rotation speed ratio and a wave-shift value upon the surface waviness error of the ground Fresnel micro-structured molds were analyzed. Both the simulation and experimental results proved that choosing the non-integer rotation speed ratio and a proper wave-shift value could greatly reduce the surface waviness error and improve the surface quality and uniformity.

show abstract

Section: Kinematical Analysis Of the Parallel Grinding Processmentioning

confidence: 99%

“…Axisymmetric complex optical elements represented by Fresnel micro-structured lenses are widely used in modern optoelectronic technology [1,2]. Fresnel micro-structured lenses retain the refractive function of traditional convex/concave lenses, but reduce the thickness, volume and weight [3,4].…”

Section: Introductionmentioning

confidence: 99%

Suppression of Surface Waviness Error of Fresnel Micro-Structured Mold by Using Non-Integer Rotation Speed Ratio in Parallel Grinding Process

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Content may change prior to final publication. Citation information: DOI 10.1109/JPHOT.2021.3069465, IEEE Photonics Journal and abformung (LIGA), nanoimprint lithography (NIL), laser direct writing, Ion Beam Lithography, laser machining, polishing and so on [4]. Ultra-precision machining mainly contains single point diamond turning (SPDT) and grinding, the surface roughness of diamond machined parts is usually smaller than 10 nm.…”

Section: Introductionmentioning

confidence: 99%

Research on Surface Quality Difference of Microlens Array Fabricated by Fast Tool Servo Cutting

Huang

Zhang

et al. 2021

IEEE Photonics J.

View full text Add to dashboard Cite

Freeform surface optical components have gained increasing attention in recent years, and higher requirements have been put forward for economical and efficient fabrication techniques.Single point diamond turning with fast tool servo is the method to process nonrotational symmetric surface with high quality. However, the surface quality of different areas is not always the same in this way. In this paper, a microlens array is fabricated by fast tool servo cutting. The reason of surface difference is analyzed theoretically, and the Position-Velocity-Time interpolation method is used to improve the surface quality and reduce the difference between different regions. A microlens array consisting of 900 spherical lenslets was machined, the size of each spherical lenslet is 1.08 mm×0.5 mm. The form error of lenslet is about 1.5 um at the edge and 1 um at the center respectively, and the roughness value of Sa are 11 nm and 8.6 nm, the results show that the theory and simulation are correct, and the ability of fast tool servo technology to realize freeform processed with high precision is demonstrated.

show abstract

“…The binderless tungsten carbide (WC), as the typical hard and brittle material, has been widely applied in the field of optics, photonics and life science owing to its ideal physical properties [ 1 ]. However, the ultra-high hardness and brittleness of the WC material also decrease the machinability and greatly limit the feasible machining approaches.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Laser Assisted Diamond Turning of Binderless Tungsten Carbide by In-Process Heating

2020

View full text Add to dashboard Cite

Binderless tungsten carbide (WC) finds widespread applications in precision glass molding (PGM). Grinding and polishing are the main processes to realize optical surface finish on binderless WC mold inserts. The laser assisted turning (LAT) by in-process heating is an efficient method to enhance the machinability of hard and brittle materials. In this paper, laser heating temperature was pre-calculated by the finite element analysis, and was utilized to facilitate laser power selection. The effects of rake angle, depth of cut, feed rate, and laser power are studied experimentally using the Taguchi method. The variance, range, and signal-to-noise ratio analysis methods are employed to evaluate the effects of the factors on the surface roughness. Based on the self-developed LAT system, binderless WC mold inserts with mirror finished surfaces are machined using the optimal parameters. PGM experiments of molding glass lenses for practical application are conducted to verify the machined mold inserts quality. The experiment results indicate that both the mold inserts and molded lenses with the required quality are achieved.

show abstract

Review on Fabrication Technologies for Optical Mold Inserts

Cited by 52 publications

References 151 publications

Suppression of Surface Waviness Error of Fresnel Micro-Structured Mold by Using Non-Integer Rotation Speed Ratio in Parallel Grinding Process

Suppression of Surface Waviness Error of Fresnel Micro-Structured Mold by Using Non-Integer Rotation Speed Ratio in Parallel Grinding Process

Research on Surface Quality Difference of Microlens Array Fabricated by Fast Tool Servo Cutting

Experimental Investigation on Laser Assisted Diamond Turning of Binderless Tungsten Carbide by In-Process Heating

Contact Info

Product

Resources

About