Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11181722 | Projection optical system and projector | Atsuo Masui, Yusuke Imai | 2021-11-23 |
| 9285574 | Variable magnification projection optical system and image projection apparatus | Kazuhiko Inoue, Yusuke Imai, Sadanobu Imamura | 2016-03-15 |
| 8699139 | Variable-focal-length projection lens system and projection apparatus | Kazuhiko Inoue, Sadanobu Imamura, Kohei Wataru | 2014-04-15 |
| 8270074 | Magnified-projection optical system and digital type planetarium device | Mitsuaki Shimo | 2012-09-18 |
| 6685322 | Optical system and projection-type image display device | Shigeru Sawamura, Katsunari Fujiki | 2004-02-03 |
| 6583940 | Projection system | Jun Nishikawa, Shigeru Sawamura | 2003-06-24 |
| 6558007 | Illumination optical system and image projection apparatus | Tomoko Nakagawa, Shigeru Sawamura | 2003-05-06 |
| 6454417 | Projection optical system comprising an optical function surface for reflecting or transmitting light from a spatial light modulator | Shigeru Sawamura | 2002-09-24 |
| 6382799 | Projection optical apparatus | Jun Nishikawa, Shigeru Sawamura | 2002-05-07 |
| 6275343 | Projection optical system | Jun Nishikawa | 2001-08-14 |
| 6028715 | Variable magnification optical system | Masakuni Tai | 2000-02-22 |
| 6014267 | Variable magnification optical system | Katsutoshi Tsurutani | 2000-01-11 |
| 5993010 | Two-dimensional illumination optical system and liquid crystal projector using same | Soh Ohzawa | 1999-11-30 |
| 5947576 | Oblique projection optical apparatus | Akira Sato | 1999-09-07 |
| 5914820 | Zoom lens system | Shunta Takimoto | 1999-06-22 |
| 5716118 | Imaging optical system | Akira Sato, Soh Ohzawa | 1998-02-10 |
| 5709445 | Oblique projection optical system | — | 1998-01-20 |
| 5683161 | Projecting optical device | Takatoshi Ishikawa, Soh Ohzawa | 1997-11-04 |
| 5543970 | Zoom lens system | Kazuyoshi Hata, Yukio Maekawa, Manami Saka | 1996-08-06 |
| 5359457 | Wide-angle zoom lens system | Manami Saka | 1994-10-25 |
| 5268793 | Zoom lens system | Manami Saka | 1993-12-07 |