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- W2140025273 abstract "A new concept for the realization of a refreshable Braille cell is presented. An electrothermally controlled microactuator that exploits the hydraulic pressure due to the volumetric expansion of melted paraffin wax is described. The paraffin wax is contained within a bulk micromachined silicon container. The container is sealed using an elastic diaphragm of silicone rubber. The container is heated using gold microheaters located on an underlying glass substrate. All the layers used to make up the containers are bonded together using an overglaze paste. The complete 3/spl times/2 dot Braille cell has air gaps between containers, to prevent unwanted actuation by means of heat leakage from adjacent containers. The prototype Braille cell measures 7/spl times/8.5/spl times/2 mm/sup 3/ and its raised dots are held in equilibrium by pulsed actuation voltages. To maintain a dot height at 50% of its maximum, a duty factor of more than 0.8 was found, with an average power of 0.30 W (PRF=0.027 Hz). The total actuation time for a dot on an up/down cycle was /spl sim/50 s. The dot height increases with an increasing duty factor with a fixed PRF, and increases with decreasing PRF with a fixed duty factor. A stable maximum dot height was achieved by reducing the cooling time." @default.
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- W2140025273 date "2005-08-01" @default.
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- W2140025273 title "A micromachined refreshable braille cell" @default.
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- W2140025273 doi "https://doi.org/10.1109/jmems.2005.845415" @default.
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