Patent ID: 7563037

Claim:
A digital camera module, comprising: a holder, the holder having a window defined in a sidewall, the window configured for receiving light; an image pickup module, the image pickup module comprising a base and a chip attached to the base, the base being mounted to the holder, the base and the holder cooperatively forming a receiving space therebetween; a prism lens, which is received in the receiving space and has a first surface configured for transmitting light passing through the window, a second surface configured for reflecting light transmitted from the first surface, and a third surface configured for transmitting the reflected light to form an image on the chip; wherein the first surface, the second surface and the third surface of the prism lens are described by the following matrices equations: ( X 3 α 3 ⁢ X ) = ( 1 0 n - n 0 - nR 3 ⁢ X n n 0 ) ⁢ ( 1 d 2 0 1 ) ⁢ ( 1 0 - 2 R 2 ⁢ X 1 ) ⁢ ( 1 d 1 0 1 ) ⁢ ( 1 0 n 0 - n - nR 1 ⁢ X n n 0 ) ⁢ ( X 1 α 1 ⁢ X ) ⁢ ( X IMP α IMPX ) = ( 1 d 3 0 1 ) ⁢ ( X 3 α 3 ⁢ X ) where, n 0 is the refractive index in free space; n is the refractive index in the prism lens; X 1 is an object height on the first surface; X 3 is an object height on the second surface; X IMP is an object height on an image plane of the prism lens; α 1X is an incident angle between light and a line normal to the first surface; α 3X is an incident angle between light and a line normal to the third surface; α IMPX is an incident angle between light and a line normal to the image plane of the prism lens; R 1X is the curvature radius of the first surface; R 2X is the curvature radius of the second surface; R 3X is the curvature radius of the third surface; d 1 is the distance between an optical center of the first surface and an optical center of the second surface; d 2 is the distance between the optical center of the second surface and an optical center of third surface; and d 3 is the distance between the optical center of the third surface and the image plane of the prism lens.