US Patent 7773320 Lens module

A lens module includes a barrel, a lens, and a light leveling assembly. The barrel includes an opening, which allows a light to pass therethrough. The lens is accommodated in the barrel. The light leveling assembly is accommodated in the barrel. The light leveling assembly includes a substrate and a film. The substrate has a first surface where the film is disposed and an opposite second surface facing the lens. A thickness of the film is approximately equal to a quarter wavelength of the light. A refractive index of the film exceeds that of the substrate.