Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same
US7152978B2 · kind B2 · utility
Assignee
Inventors
- Nobuhiko Konuma
- Hidetomo Yoshimura
- Seiichi Sekiguchi
- Mikiharu Kuwata
- Masaharu Deguchi
- Takashi Kakuda
- Yutaka Matsuda
- Takuya Shiaki
- Futoshi Yamasaki
- Atsushi Ishibashi
- Koichi Umezawa
- Takeshi Hoshino
- Shigehisa Hagura
- Makoto Fukatsu
- Nobuyuki Kaku
- Kenji Fuse
- Satoshi Ohuchi
- Tomohiro Miyoshi
- Naohiro Ozawa
- Masahiko Yatsu
- Yasuo Otsuka
- Takesuke Maruyama
Key dates
| Filing date | Oct 26, 2004 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Oct 26, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal projector comprises an illuminating optical system including a light source, a color separating optical system for separating illuminating light rays emitted by the illuminating optical system into light rays of three colors, a projection lens unit comprising a projection lens, a cross dichroic prism disposed near a light receiving end of the projection lens, and a plurality of liquid crystal panels arranged around the cross dichroic prism, and a light source power supply for supplying power to the light source. The projection lens unit, the color separating optical system, the illuminating optical system and the light source power supply are arranged in that order. The liquid crystal projector has an outside size in a horizontal plane of 263 mm by 318 mm or below. The liquid crystal panels have a display screen size of 0.9 in. A cooling fan for cooling the plurality of liquid crystal panels is disposed beside the projection lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.