发明申请
US20070159692A1 Fresnel lens sheet and rear projection screen using it 失效
菲涅尔透镜片和背投屏幕使用它

  • 专利标题: Fresnel lens sheet and rear projection screen using it
  • 专利标题(中): 菲涅尔透镜片和背投屏幕使用它
  • 申请号: US10583136
    申请日: 2004-12-16
  • 公开(公告)号: US20070159692A1
    公开(公告)日: 2007-07-12
  • 发明人: Kazunori HiroseMakoto Toyohara
  • 申请人: Kazunori HiroseMakoto Toyohara
  • 申请人地址: JP Okayama 710-8622
  • 专利权人: Kuraray Co., Ltd.
  • 当前专利权人: Kuraray Co., Ltd.
  • 当前专利权人地址: JP Okayama 710-8622
  • 优先权: JP2003-418896 20031217
  • 国际申请: PCT/JP04/19270 WO 20041216
  • 主分类号: G03B21/56
  • IPC分类号: G03B21/56 G02B3/08
Fresnel lens sheet and rear projection screen using it
摘要:
A Fresnel lens sheet which is bright due to a small light quantity loss, is restricted in speckles and ghosts, does not produce moires, and can be used in an inexpensive transmitting screen, wherein the sheet satisfies the diffusion characteristics of the following expressions (1) and (2), or the following expressions (3), (4) and (5). γ/α≦2.8 (1) ζ/α≦6 (2), where α is viewing half value angle, γ viewing 1/10 value angle, and ζ viewing 1/100 value angle. 2.0°≦α≦5.5° (3), where α is viewing half value angle, γ≦12° (4), where γ is viewing 1/10 value angle, ζ≦18° (5), where ζ is viewing 1/100 value angle.
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