| 摘要 |
PROBLEM TO BE SOLVED: To provide a dimmer filter excellent in wavelength flatness.SOLUTION: A dimmer filter (100) includes: an optical substrate (110); and a light absorption film (120) that is formed on a surface of the optical substrate. The light absorption film includes: a first light absorption film (122, 126) such that as wavelength of light transmitted is increased, an extinction coefficient is increased; and a second light absorption film (124) such that as wavelength of light transmitted is increased, an extinction coefficient is decreased.SELECTED DRAWING: Figure 1 |
