Method for adjusting relative position of lens module by using uniform light source

A method for adjusting relative position of a lens module by using a uniform light source, the lens module including a bottom board, an image sensor, an adjustment module and a lens apparatus, the image sensor being disposed on the bottom board and perpendicular to the optical axis of the uniform light source, the image sensor including a plurality of pixels, the image sensor further including a first area, a second area, a third area and a fourth area, the first area, the second area, the third area and the fourth area including at least one pixel respectively, the lens apparatus being movably disposed in front of the image sensor, the lens apparatus being connected to the bottom board by the adjustment module, the image sensor electrically connecting to a test module, the test module electrically connecting to the adjustment module, the method comprising:

• respectively receiving a first signal, a second signal, a third signal and a fourth signal from the first area, the second area, the third area and the fourth area;
• the test module processing the first signal, the second signal, the third signal and the fourth signal respectively to determine an adjustment quantity;
• and
• selectively adjusting the relative position between the image sensor and the lens apparatus through the adjustment module according to the adjustment quantity, wherein the first area, the second area, the third area and the fourth area have a same distance to a geometric center of the image sensor respectively;
• and
• the adjustment quantity is calculated according to a difference between a minimum value and a maximum value among the first signal, the second signal, the third signal and the fourth signal.