| 摘要 |
At an exposure section, a recording head carries out exposure processing by irradiating a light beam from a fiber array light source through a collimator lens and a condensing lens to a printing plate. A temperature sensor of the recording head measures temperature of the recording head. A pulse motor is driven on the basis of the measured temperature, and thus a separation between the collimator lens and the condensing lens is adjusted. Consequently, regardless of expansion or contraction of the recording head due to temperature changes, the separation between the collimator lens and the condensing lens can be kept constant by the pulse motor. Therefore, even when the light beam incident on the condensing lens is divergent, a shift in magnification of the recorded image can be prevented regardless of the temperature variations of the recording head.
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