| US 7,540,617 B2 | ||
| Illumination optical apparatus and projection type display apparatus | ||
| Ryuuji Yamada, Tokyo (Japan); Hiroshi Gouda, Tokyo (Japan); and Katsuyuki Takeuchi, Tokyo (Japan) | ||
| Assigned to Kyocera Corporation, Kyoto (Japan); and NEC Display Solutions, Ltd., Tokyo (Japan) | ||
| Filed on Nov. 08, 2005, as Appl. No. 11/270,426. | ||
| Claims priority of application No. 2004-344865 (JP), filed on Nov. 29, 2004. | ||
| Prior Publication US 2006/0114418 A1, Jun. 01, 2006 | ||
| Int. Cl. G03B 21/14 (2006.01) | ||
| U.S. Cl. 353—38 [353/101; 362/283] | 7 Claims |
| 1. An illumination optical apparatus comprising: a first fly-eye lens having a plurality of lens cells arranged along two
directions orthogonal to each other and to an optical axis;
a second fly-eye lens having a plurality of lens cells arranged along two directions orthogonal to each other and to said
optical axis;
a first lens holding member holding said first fly-eye lens;
a second lens holding member joined to said first lens holding member, and holding said second fly-eye lens; and
a third lens holding member joined to said second lens holding member, and holding an optical lens;
wherein an illumination area is formed as a result of each shape of a lens cell aperture of said first fly-eye lens being
projected by said second fly-eye lens and said optical lens to be enlarged, and
said first lens holding member and said second lens holding member are joined to be relatively rotatable about said optical
axis.
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