| 摘要 |
A pyroelectric crystal, e.g. a LN crystal (<HIL><PDAT>1</BOLD><PDAT>), is coated with conductive films (<HIL><PDAT>8</BOLD><PDAT>). When polarization charges (<HIL><PDAT>4</BOLD><PDAT>) are generated on the surface of the LN crystal (<HIL><PDAT>1</BOLD><PDAT>) due to its pyroelectric effect upon accumulation of stress, the presence of the conductive films (<HIL><PDAT>8</BOLD><PDAT>) induces on themselves reverse electric charges (<HIL><PDAT>9</BOLD><PDAT>) matching the polarization charges (<HIL><PDAT>4</BOLD><PDAT>) generated on the surface of the LN crystal (<HIL><PDAT>1</BOLD><PDAT>). Therefore an electric field created by the polarization charges (<HIL><PDAT>4</BOLD><PDAT>) is canceled by an electric field created by the reverse charges (<HIL><PDAT>9</BOLD><PDAT>) induced on the conductive films (<HIL><PDAT>8</BOLD><PDAT>). The conductive film (<HIL><PDAT>8</BOLD><HIL><PDAT>b</ITALIC><PDAT>) formed on a face through which signal light is transmitted is formed from a medium transparent with respect to the signal light. Therefore the light path of the signal light is not blocked by the conductive film (<HIL><PDAT>8</BOLD><HIL><PDAT>b</ITALIC><PDAT>), and the polarization charges (<HIL><PDAT>4</BOLD><PDAT>) generated on the signal transmissive face can be neutralized.</PTEXT>
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