| 摘要 |
<p>Desired spectral characteristics are obtained by bringing reflection films sufficiently close together while avoiding optical contact between the reflection films. Provided is a variable spectral element (1) that includes a pair of optical substrates (2,3) that oppose each other with a gap therebetween; two mutually opposing reflection films (5) respectively disposed on the opposing surfaces of the optical substrates (2, 3); two mutually opposing sensor electrodes (6) that are disposed respectively on the sides where the reflection films (5) are disposed, and that form a distance sensor that detects the distance between the optical substrates (2,3); and an actuator (4) that changes the distance between the optical substrates (2, 3) by relatively moving the optical substrates (2, 3); wherein the distance between the opposing surfaces of the two reflection films (5) is larger than the distance between the opposing surfaces of the two sensor electrodes (6).</p> |
