| 摘要 |
PURPOSE:To attain the expression of gradation by using a monochromatic light emitting light source and arranging plural liquid crystal arrays changing a gap, i.e. the layer thickness of liquid crystal. CONSTITUTION:A liquid crystal printer head is provided with the monochromatic light emitting light source lamp 14, two kinds of liquid crystal shutter arrays 11, 12 having different gaps and SELFOC lens arrays 15, 16. When liquid crystal is homogeneously orientated and held by polarizing plates whose polarizing axes are rectangular to each other in the liquid crystal shutter array, the transmitted light intensity I of monochromatic light is proportional to the following formula sin<2>(pidDELTAn/eta), where (d) is the layer thickness of liquid crystal, DELTAn is the double refraction of liquid crystal and lambda is the wavelength of incident light, and when monochromatic light is made incident, the transmitted light intensity depends upon the gap of the liquid crystal shutter array. The surface potential is reduced in accordance with the exposure of the photosensitive body. Consequently, the liquid crystal printer head capable of expressing gradation without forming a microshutter with a small area can be obtained.
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