[1] [1] YANG Bo, WANG Yongtian, LIU Yue, et al. Efficient raytracing for freeform reflectors［J］. Optik, 2009, 120(1): 4044.

[3] [3] DU Xue, WANG Erqi, LI Rongbin, et al. Investigation on error factor of injection molding plastic for freeform optics［J］. Journal of Applied Optics, 2007, 28(6): 684688.

[4] [4] ZHAO Xing, FANG Zhiliang, CUI Jicheng, et al. Study on the optical engine of the miniprojector［J］. Acta Optica Sinica, 2007, 27(5): 913918.

[5] [5] HICKS R A. Direct methods for freeform surface design［C］. SPIE, 2007, 6668: 666802.

[6] [6] CHANG S. Offaxis reflecting telescope with axiallysymmetric optical property and its applications［C］. SPIE, 2006, 6265: 626548.

[7] [7] JEONG H S, YOO H S, LEE S H, et al. Low profile optic design for mobile camera using dual freeform reflective lenses［C］. SPIE, 2006, 6288: 628808.

[8] [8] TOGINO T. Decentered optical system and optical apparatus equipped therewith: US, 6646812［P］. 20031111.

[9] [9] TAKAHASHI J. Image display apparatus: US, 6028709［P］. 20000222.