| 摘要 |
A lens system having an infrared filter for a compact camera module is provided. The lens system is an achromatic lens system and has two lenses. The first lens has a positive focal length, and the second lens has a negative focal length. The first lens is made of copper ion containing glass which absorbs infrared light and functions as an infrared filter. The second lens has an Abbe number that is smaller than that of the first lens with a difference between the Abbe numbers of the first lens and the second lens being at least 15.
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