Manufacture of Multiple-focus Micro Fresnel Lenses by Means of Nonrotational Diamond Grooving

Takeuchi, Yoshimi; Maeda, Shinji; Kawai, Tomohiko; Sawada, Kiyoshi

doi:10.1016/s0007-8506(07)61532-7

Cited by 57 publications

(22 citation statements)

References 3 publications

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“…The technique has been widely used in areas of biotechnology, medicine, electronics, telecommunications, and aerospace . Takeuchi et al fabricated Fresnel lens molds with V‐shaped microgrooves (groove side roughness Ra < 3.2 nm) via ultraprecision diamond cutting . Li et al developed a Fresnel lens mold with an arc‐curved surface with a surface roughness of Ra 7.3 nm .…”

Section: Introductionmentioning

confidence: 99%

Controllable Anisotropic Dry Adhesion in Vacuum: Gecko Inspired Wedged Surface Fabricated with Ultraprecision Diamond Cutting

Tao

Gao

et al. 2017

Adv Funct Materials

111

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Gecko adhesion has inspired the fabrication of various dry adhesive surfaces, most of which are developed to be used under atmospheric conditions. However, applications of gecko-inspired surfaces can be expanded to vacuum and even space environment due to the characteristics of van der Waals interactions, which are always present between materials regardless of the surrounding environment. In this paper, a controllable, anisotropic dry adhesion in vacuum is demonstrated with gecko-inspired wedged dry adhesive surfaces fabricated using an ultraprecision diamond cutting mold. The adhesion and friction properties of the wedge-structured surfaces are systematically characterized in loading-pulling mode and loading-dragging-pulling mode. The surfaces show significant anisotropic adhesion (P ad ≈ 10.5 kPa vs P ad ≈ 0.7 kPa) and friction (P f ≈ 50 kPa vs P f ≈ 30 kPa) when actuated in gripping and releasing direction, respectively. The wedge-structured surfaces in vacuum show comparable properties as exposed in atmosphere. A three-legged gripper is designed to pick up, hold, and release a patterned silicon wafer in vacuum. The study demonstrates a green, high-yield, and low-cost method to fabricate a reliable and durable mold for gecko inspired anisotropic dry adhesive surfaces and the potential application of dry adhesive surface in vacuum.

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Section: Introductionmentioning

confidence: 99%

Controllable Anisotropic Dry Adhesion in Vacuum: Gecko Inspired Wedged Surface Fabricated with Ultraprecision Diamond Cutting

Tao

Gao

et al. 2017

Adv Funct Materials

111

View full text Add to dashboard Cite

show abstract

“…Diamond grooving of Fresnel lenses can enable more complex structures. Due to the process kinematics it is possible to machine multi focus Fresnel lenses consisting of different segments [2]. Blazed gratings are another application example, which can also be machined with linear process kinematics [3] or by diamond milling [4].…”

Section: Introductionmentioning

confidence: 99%

Diamond turning of diffractive microstructures

Meier¹

2015

Precision Engineering

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“…It is able to realize light collimation and concentration with much less lens materials compared to a conventional spherical lens by collapsing the continuous surface profile of the spherical lens onto a plane. Radial Fresnel lenses are usually fabricated by ultra-precision diamond machining [1], or by plastic injection moulding [2].…”

Section: Introductionmentioning

confidence: 99%