Young Optics Inc.

Chi-Chang Tien

Ya-Ling Hsu

Yi-Hsueh Chen

Li-Chiu Tsai

A wide-angle projection system includes a refraction unit and a reflection unit. The refraction unit includes a first lens group of positive refractive power and a second lens group of negative refractive power. The second lens group is disposed between the first lens group and the reflection unit and the condition: 0.9&#x3c;A/B&#x3c;1.4 is satisfied, where A denotes a distance along an optical axis of the wide-angle projection system and between the refraction unit and the reflection unit, and B denotes a total length of the refraction unit along the optical axis.

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Hsinchu, Taiwan

Chi-Chang Tien