| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a projection optical apparatus, capable of preventing deterioration in image quality and of reducing the apparatus in size. <P>SOLUTION: The projection optical apparatus includes a light valve; and a projection optical system, including a first optical system 5 having a transmissive refractive element and a second optical system 3' having a reflective refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface 4. The first optical system 5 is in the first the optical system 5. When the first optical system 5 contains the reflective element, the optical axis is folded both vertically and horizontally, within a range close to the light valve other than it. The first group 5A of the first optical system 5 is contained in a space (dead space), whose lower limit is defined by a lower edge of the second optical system 3', thereby reducing the depth of the apparatus to D1. <P>COPYRIGHT: (C)2009,JPO&INPIT |
