Importance

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Abstract

An optical scanning device comprises a light source for emitting a light, a light guide path being adapted to receive the emitted light and to transmitting the received light therein, a plurality of diffraction gratings disposed on the light guide path for taking out the transmitted light in a form of an array, and a liquid crystal shutter for scanning the taken out light in the form of the array. An optical scanning device comprises a first substrate, a second substrate, a liquid crystal layer sandwiched between the first substrate and the second substrate, a light guide path disposed on the first substrate for entering a light transmitted therein into the liquid crystal layer, a plurality of micro lenses disposed on the second substrate for converging the entered light, wherein, assuming that n.sub.CORE is a refraction index of a light guide medium forming the light guide path, that n.sub.LCON is a refraction index of a liquid crystal when an electric field is applied (on), and that n.sub.LCOFF is a refraction index of the liquid crystal when the electric field is not applied (off), a relation of n.sub.LCON >n.sub.CORE >n.sub. LCOFF or n.sub.LCON

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First Claim