Flat fingerprint acquisition device

The present utility model provides a flat fingerprint acquisition device which comprises an upper cover, a shell, an acquisition prism, a light source, an imaging device, a circuit board and a pedestal, the upper cover and the pedestal are arranged on the shell; the device is characterized in that the acquisition prism is a right trapezoid prism, the length of the acquisition prism is 29.6mm, the width of the acquisition prism is 21mm, the height of the acquisition prism is 7.6mm, the angle between the waist surface and the lower bottom surface of the acquisition prism is 65 to 75 degrees; two summits formed by intersecting the upper bottom surface with the straight waist surface of the acquisition prism are provided with two positive triangular pyramid chamfers, and the length of a right-angle side of a side isosceles right angled triangle of each positive triangular pyramid chamfer is 1.5mm. In the flat fingerprint acquisition device, the dimension of the acquisition surface of the acquisition prism is redu