Micro-reflectors

Fine contours of the model surface are accurately transferred to the galvanized mold inserts through electroplating, such as genuine leather grains, skin texture, fine diamond cuts as used in micro-reflectors, high-gloss polish, etc. 

LGPs with optical micro-reflectors (MRs) are shown in Fig. 5.2 [1, 4-6]. An MR element has a shape of a micro-lens or microprism with optical surface. The MR elements are structured on the back surface of an LGP [7-16]. Each MR element reflects light based on the total internal reflection (TIR). To provide a uniform extracted luminance on the BLU, an array of MR elements are fabricated on a mold with an optical surface. The pattern of the mold is transferred onto an LGP in an injection molding. The MR element is often a concave or convex lenslet with round, square, elliptical, or diamond geometrical shape [ 1,8]. An MR element reflects... 

In the design of an LGP the emergent light is assumed and the micro-reflector and micro-deflectors are designed, respectively, in which the combination can provide the required light cone on the LGP. A proper gradation of the element positions can be designed and structured. 

Kalil Kalantar, Shingo Matsumoto, and Tomohisa Onishi, functional light-guide plate characterized by optical micro-deflector and micro-reflector for LCD backhght, IEICE Transactions on Electronics, Volume E84-C,Number 11, 1637-1646(2001) ... 

Fig. 8 Experimental scheme of a spectral transmission experiment of a photonic crystal Bragg reflector micro-cavity fabricated out of refilled holes in silicon. The central refilled hole acts on a nanocavity. AuNPs are immobilized in and around the central nanocavity...

Thermomechanlcal Behavior. Requirements for optical performance Impose unprecedented requirements for dimensional stability of polymers used In hlgh-concentratlon reflectors. Requirements for mechanical compatibility are also strict for photovoltaic systems subjected to moisture and thermal stresses. Moisture, temperature, and UV, separately and In combination, can change the volume and thus the stress state of polymers. For example, temperature and humidity cycles alone do not cause surface micro-cracks In polycarbonate. However, In the presence of UV radiation, such cycles cause microcracks, while UV alone does not [32]. An understanding of these relationships Is essential to permit reliable design of equipment that uses polymers. 

Charrier J, Pirasteh P, Boucher YG, Gadonna M (2012) Bragg reflector formed on oxidised porous silicon. Micro Nano Lett 7 105-108... 

XIV-4] KOBAYASHI, Y., et al., A study of magnetic impact type micro-stepping actuator to drive large payload reflector for 4S reactor, IMECE2004-59372, 2004 ASME International Mechanical Engineering Congress and RD D Expo (Anaheim CA, USA, Nov. 13-19, 2004). 

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