| 摘要 |
PROBLEM TO BE SOLVED: To obtain a PLZT exposure head with which the change of a transmissivity characteristic due to temperature is surely corrected by connecting a voltage changing part, by which applied voltage is changed based on a data measured by an ambient temperature measuring means. SOLUTION: This PLZT exposure head 8 is connected with a drive power source part 12 provided with a voltage changing part 12a, consisting of a transformer, etc., through which the applied voltage is changed in response to the change of the ambient temperature. Thus, the head 8 is provided with a temperature sensor 8a, which is the ambient temperature measuring means and is provided with a control part 11 for applying and instructing so as to obtain specified voltage at a PLZT exposure shutter in response to the ambient temperature measured. The control part 11 is provided with a storing means for storing beforehand the relational data of temperature and the applied voltage, and the relation of the ambient temperature and the applied voltage is prepared in advance and is stored by the storing means of the control part 11, so that the wavelength transmissivity characteristic of the PLZT exposure shutter is corrected to be at an optimum state with respect to the change in the ambient temperature by the storing means.
|
