Optical waveguides – With optical coupler – Input/output coupler
Patent
1994-03-07
1995-09-19
Healy, Brian
Optical waveguides
With optical coupler
Input/output coupler
385 15, 385 18, 385129, 385131, 385 27, 359 8, 359 30, 359 42, 359 56, 359 58, 359 82, 347241, G02B 634, G01D 1510
Patent
active
054523850
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 <n.sub.CORE <n.sub.LCOFF is satisfied.
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Fujiwara Sayuri
Izumi Yoshihiro
Conlin David G.
Fournier Kevin J.
Healy Brian
Sharp Kabushiki Kaisha
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