| 摘要 |
Provision of a light intensity adjuster adapted for use of an infrared ray cutoff filter as necessary for high integrity, without getting excessive in thickness. A light intensity adjuster includes a light intensity adjusting mechanism adapted for variations in opening area to adjust the intensity of transmitted light, and a filter switching mechanism made up to move an infrared ray cutoff filter (43) to a position of opening at the light intensity adjusting mechanism and displace the infrared ray cutoff filter from the position of opening, and has a recess shape portion (110b) provided at a separation member (110) facing the infrared ray cutoff filter at the filter switching mechanism to accommodate the infrared ray cutoff filter to be free from interferences. |
