Optical system
An optical system including a photo sensor, a wafer level optical (WLO) lens module and a focusing motor is provided. The WLO lens module is located at the photo sensor. The WLO lens module includes at least one transparent substrate and at least one lens, wherein the lens is disposed on the transparent substrate. The focusing motor is located between the WLO lens module and the photo sensor. The focusing motor drives the WLO lens module to move toward or backward the photo sensor.
1. An optical system, comprising:
a photo sensor;
a first WLO lens module, disposed on the photo sensor, and comprising a first transparent substrate and a first lens, wherein the first lens is disposed on the first transparent substrate and the materials of the first transparent substrate and the first lens are different;
a second WLO lens module, located above the first WLO lens module, and a space being maintained between the first WLO lens module and the second WLO lens module, the second WLO lens module comprising a second transparent substrate and a second lens, wherein the second lens is disposed on the second transparent substrate and the materials of the second transparent substrate and the second lens are different; and
a focusing motor, located between the first WLO lens module and the second WLO lens module, and suitable for moving the first WLO lens module or the second WLO lens module to adjust the space
a plurality of spacer layers, respectively disposed between the first transparent substrate and the focusing motor and between the second transparent substrate and the focusing motor.
2. The optical system as claimed in claim 1 , wherein a material of the spacer layers is a light-shielding material or a light-absorbing material.
3. The optical system as claimed in claim 1 , wherein the at least one first lens and the at least one second lens comprise a convex lens or a concave lens.
4. The optical system as claimed in claim 1 , wherein the focusing motor comprises a telescopic structure, wherein the telescopic structure is connected to the first WLO lens module or the second WLO lens module, so as to move the first WLO lens module or the second WLO lens module to adjust the space.
5. The optical system as claimed in claim 4 , wherein the telescopic structure comprises a thread structure.
6. The optical system as claimed in claim 1 , wherein the focusing motor is a stepping motor.
7. The optical system as claimed in claim 1 , wherein the photo sensor is a CMOS sensor or a CCD.