Title: Wide angled projector display screen
Application Number: 02132837 Application Date: 2002.08.30
Publication Number: 1479164 Publication Date: 2004.03.03
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G03B21/60
Applicant(s) Name: Changchun Qiushi Optical Equipment Co., Ltd. Address: 130021
Inventor(s) Name: Li Jichang, Guo Baoquan
Attorney & Agent: yu yan
Abstract:
     A wide-angle projected screen is composed of Fresnel lenses and plano-cancave long cylindrical negative lenses. For said negative lens, its at least one surface is coated by an optical diffusion film which is prepared from photosensitive resin (97.5-99.95%) and RE oxide (0.05-2.5%) chosen from thoriam oxide, lanthanum oxide and neodymium oxide.
Time: 9
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