Penta-mirror multi-reflection scanning module

A penta-mirror multi-reflection image scanning module, comprising at least one light source, five reflecting mirrors, a pickup lens, an image sensor and a frame;

• wherein the light source is projecting light onto a scanning document to produce an image beam Li incident at the image scanning module;
• the five reflecting mirrors are provided for reflecting the image beam Li to form an image beam Lo incident at the pickup lens;
• the pickup lens is provided for focusing the image beam Lo to the image sensor;
• the frame is provided for disposing the light source, the five reflecting mirrors, the pickup lens and the image sensor;
• the image beam Li, the five reflecting mirrors and the image beam Lo constitute an optical path, and at least two of the five reflecting mirrors on the optical path have a multi-reflection for two or more times of reflections and satisfy the optical condition of:
• -
• 1
• 2
• ·
• π
• (
• p
• +
• 1
• )
• ≤
• ∑
• i
• =
• 1
• p
• 
• α
• i
• -
• π
• 2
• 
• (
• p
• +
• 1
• )
• ≤
• 1
• 2
• ·
• π
• (
• p
• +
• 1
• )
• ;
• wherein p is the total number of reflections along the optical path, and αi is an inclined angle between a normal line of a reflecting plane of an ith reflecting mirror along the optical path and a +Z-axis.