| 摘要 |
An IR cut filter is provided that blocks light radiation of wavelengths in excess of 700 nm and minimizes occurrence of ghost while sufficiently transmitting red visible light radiation of 600 nm to 700 nm wavelengths. An IR cut filter 1 includes an infrared light absorber 2 and an infrared light reflector 3. The infrared light absorber 2 has a light transmission property of 50% transmittance with respect to a wavelength in a wavelength band of 620 nm to 670 nm. The infrared light reflector 3 has a light transmission property of 50% transmittance with respect to a wavelength in a wavelength band of 670 nm to 690 nm. The wavelength with respect to which the infrared light reflector 3 has the 50% transmittance is longer than the wavelength with respect to which the infrared light absorber 2 has the 50% transmittance. A combination of the infrared light absorber 2 and the infrared light reflector 3 provides a light transmission property of 50% transmittance with respect to a wavelength in the wavelength band of 620 nm to 670 nm and less than 5% transmittance with respect to a wavelength of 700 nm. |
