Process for manufacturing a double refraction plate
 A novel process for producing a double refraction plate is disclosed. According to the process, a transparent dielectric material is directed to and deposited on a substrate from an oblique direction. Above all, for controlling the retardation of the resulting double refraction plate, a polarized light having a plane of polarization in a specific direction relative to the substrate is directed to the substrate through the variable phase plate and the light reflected from the substrate is observed through the variable phase plate, as the dielectric material is deposited from an oblique direction. 
Sony Corporation
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G02B G01N C23C G01N C23C Y10S
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Toshio
Mori