| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a taking lens dispensing with focusing when capturing an image under visible light and when capturing an image under infrared ray. <P>SOLUTION: This taking lens 10 includes a hologram 11 for matching a position where light in an infrared region with a wavelength of 850 nm focuses, with a focusing position where light in a visible light region (400 nm-700 nm) focuses. Assuming that a reference wavelength (500 nm) of the light in the visible light region is defined as W1, a specific wavelength (850 nm) is defined as W2, a focal length of the entire system with respect to the reference wavelength is defined as f, and a focal length of the hologram with respect to the specific wavelength is defined as fH, the taking lens 10 satisfies the following expression: 6<¾fH/f¾/(W2/W1)≤14. <P>COPYRIGHT: (C)2012,JPO&INPIT |
