Title:
投写用レンズシステムおよびプロジェクタ装置
Document Type and Number:
Japanese Patent JP4366086
Kind Code:
B2
Abstract:
A projection lens system that projects projected light from a light modulator to a screen, comprising in order from a screen side: a first lens group with a negative refractive power; a second lens group with a positive refractive power; and a third lens group with a positive refractive power is provided. The third lens group includes at least two cemented lenses and a lens with a positive refractive power positioned on an opposite side of the cemented lenses to the screen. Since the projection lens system achieves a sufficiently high correcting performance for various aberrations using fewer aspherical lenses, it is suitable lens system for a rear projector with high image quality.
Inventors:
Kobayashi Satoshi
Application Number:
JP2003021540A
Publication Date:
November 18, 2009
Filing Date:
January 30, 2003
Export Citation:
Assignee:
Nitto Optical Co., Ltd.
International Classes:
G02B13/16; G02B3/00; G02B9/00; G02B13/24; G02B27/18; G03B21/00; H04N5/74
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Foreign References:
| US6471359 |
Attorney, Agent or Firm:
Akira Imai