| 摘要 |
<p>PURPOSE:To prevent a noise picked up due to light transmission when a liquid crystal shutter array is closed by satisfying a specific condition by a half reduction exposure light quantity and light quantity contrast to reduce exposure light quantity and photosensitive material potential to the half for a photosensitive material with optical attenuation characteristic with which no photosensitive material potential is attenuated at the initial stage of exposure and it is attenuated steeply at the middle stage of exposure. CONSTITUTION:This device is comprised so that the exposure light quantity P1, the half reduction exposure light quantity P1/2, and the light quantity contrast R to reduce the photosensitive material potential to half can satisfy a condition RxP1<P1/2 for the photosensitive material 1 provided with the optical attenuation characteristic with which no photosensitive material potential is attenuated at the initial stage of exposure and it is attenuated steeply at the middle stage of exposure. In other words, the exposure light quantity P1 from a micro shutter 33 opened after uniform electrification is applied to the photosensitive material 1 exceeds the exposure light quantity P1/2 reduced to half, however, the exposure light quantity P2 from the closed micro shutter 33 is prevented exceeding the exposure light quantity P1/2 reduced to half. Also, the light quantity contrast R is set so a to be P2/P1. In such a way;, it is possible to perform recording with high density by a liquid crystal shutter head 3 without picking up the noise due to the light transmission when the liquid crystal shutter array 33 is closed.</p> |
