| 摘要 |
A wavelength separation filter 206 is composed of lambda/4 multilayer films 302 to 304 that are sequentially laminated on a multilayer interference filter 301. The multilayer interference filter 301 is composed of two lambda/4 multilayer films with a dielectric layer sandwiched therebetween. Also, the multilayer interference filter 301 is composed of parts 301B, 301G, 301R that transmit blue light, green light, and red light, respectively. The multilayer interference filter 301 wavelength-separates visible light. The lambda/4 multilayer films 302 to 304 reflect light having a wavelength within wavelength ranges having set-wavelengths of 800 nm, 900 nm, and 1000 nm respectively. In other words, the lambda/4 multilayer films 302 to 304 reflect near infrared light.
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