发明名称 |
PROJECTION OPTICAL APPARATUS |
摘要 |
A projection optical apparatus capable of providing high image quality and having a reduced size is disclosed. The projection optical apparatus includes a light valve and a projection optical system including a first optical system having a transmissive-refractive element and a second optical system having a reflective-refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface. The optical axis in the first optical system is folded both vertically and horizontally. The first group of the first optical system is contained in a space (dead space) whose lower limit is defined by a lower edge of the second optical system, thereby reducing the depth of the apparatus. |
申请公布号 |
EP2191328(A4) |
申请公布日期 |
2014.03.19 |
申请号 |
EP20080834014 |
申请日期 |
2008.09.02 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
TAKAURA, ATSUSHI;FUJITA, KAZUHIRO;ABE, ISSEI;YAMAKAGE, AKIHIRO;NAGASE, OSAMU;KOHNO, YOSHITSUGU |
分类号 |
G03B21/14;G02B17/08;G02B26/08;G02B27/28;G03B21/28 |
主分类号 |
G03B21/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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