US Patent 7701650 Wide-angle lens module and endoscope

A wide-angle lens module includes a first lens and a second lens with negative refracting power, a third lens with positive refracting power, a fourth lens with negative refracting power, a fifth lens with positive refracting power, a sixth lens with positive refracting power, and a seventh lens with negative refracting power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are disposed in order from an object side to an image side.