Patent ID: 8270083
Filing Date: 2012-09-18
Classification: G02B,G03B

Abstract:
1. An optical system processing incoherent light divided into at least two spectral bands, a first spectral band for long wavelengths and a second spectral band for short wavelengths, a center wavelength value of the first spectral band being higher than a center wavelength value of the second spectral band, comprising: an optical transfer function; a lens to focus the incoherent light received from an object onto an image plane; a storage device to store a representation of the light images due to said at least two spectral bands received in the image plane; and a device to increase a depth of field of the optical system adapted for shots taken outdoors with an exterior light and shots taken indoors with an interior light, the device comprising an optical element interposed between the object and the image plane, the optical element having a longitudinal chromatic inversion function such that a focal length for a blue light is greater than a focal length for a red light; and wherein the inversion function has the effect of modifying the optical transfer function of the optical system such that the optical transfer function value is higher in both frequency bands with the optical element than without the optical element for an object placed in a first distance range relative to the lens and for exterior light.