| 摘要 |
An optical system is provided to correct distortion of the optical system and insert an infrared filter into the device easily, so it is mounted on a mobile phone and PDA. An optical system on which a small terminal is mounted, a first lens(100) has at lest one aspherics side and positive refractive power. A second lens(200) has at lest both aspherics sides and positive refractive power. A third lens(300) has at lest both aspherics sides and positive refractive power. They are arranged from the object side to an image successively. An iris is arranged between the first lens and second lens to control the amount of light and blocks the light.
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