US Patent 7119842 Image capturing device including a spectrally-selectively transmissive diaphragm

An image-capturing device includes a photographing lens, a first imaging device, a second imaging device and a diaphragm. The photographing lens forms subject images on the first and second imaging devices. The first imaging device receives light rays of the infrared spectrum through the photographing lens and captures a subject image formed by the infrared rays. The second imaging device receives light rays of the visible spectrum through the photographing lens and captures a subject image formed by the visible rays. The diaphragm is mounted in a photographing optical system which includes the photographing lens, and the diaphragm forms a first area and a second area. The first area transmits light rays of the infrared and visible spectrums. The second area selectively transmits light rays of either the infrared or the visible spectrum.