| 摘要 |
The present invention provides a position-control device for a light modulation device, capable of easily performing a position-control operation. A position-control device is provided with a reference projection lens built therein capable of being commonly used, the reference projection lens projecting light combined by a crossed dichroic prism and forming a projection image, and having a predetermined optical characteristic. If the position of the optical axis is aligned once when the reference projection lens was built in, it is not necessary to align the optical axes every time the positions of liquid crystal panels are controlled and the replacement of the liquid crystal panels and the crossed dichroic prism is only required, whereby the position-control operation can be easily performed.
|
