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投影电视机小荧光屏上的电视图象,通过一套称之为投影镜头的光学系统,投射到银幕上形成实象,供电视观众欣赏。在投影电视机中较常用的一种光学系统是施米特(Schmidt)投影镜头。投影电视图象质量不仅决定于电子系统各部分的指标,而且也决定于光学系统的质量指标。为了提高投影电视图象的质量,电子系统各部分日益改善,因而要求光学系统必须与之充分配合。近年来,针对投影电视光学系统的质量问题,采取了一些措施,使银幕上图象质量获得改善。
The television images on the small fluorescent screen of a projection television project through a set of optical systems called projection lenses and project onto the screen to form a real image for the audience to enjoy. One of the more common optical systems used in projection televisions is the Schmidt projection lens. Projection television image quality is not only determined by the various parts of the electronic system indicators, but also depends on the optical system quality indicators. In order to improve the quality of projection television images, various parts of the electronic system are improving day by day, and thus the optical system must be fully compatible with it. In recent years, some measures have been taken to improve the image quality on the screen against the quality problems of the projection television optical system.