SURVEILLANCE CAMERA LENS FOR VISIBLE AND NEAR INFRARED WAVELENGTH

摘要

In the present design is visible light wavelength band, as well as on the near IR wavelength as bands at about the visible and near-infrared wavelength band monitoring camera lenses having an excellent resolution performance, a methoxy varnish of the carcass-type sound having a convex surface with respect to the object-side magnification lens claim the first lens (L1) and the object side and a second lens (L2) amount of the magnification lens having a convex surface with respect to the image side and a positive scale having a convex surface with respect to the image side and the object side lens of the third lens ( fixed disposed between L3) and, in the mail varnish of the carcass-type sound having a concave surface with respect to the object side, the magnification lens and the fourth lens (L4), and the first lens (L1) and said second lens (L2) in the lens of monitoring configured to stop the camera, the first lens, the second lens, the third by forming the refractive index and the dispersion coefficient of the lens and the fourth lens to a predetermined value, the evaluation item, MTF value of the lens resolution performance conventional lens compared to May of the MTF values Hi it was good, and it was improved so that there is no big difference between the value of the MTF in the visible and near-infrared wavelength band to maintain the resolution performance with no change in the band.