Projection lens
A projection objective forms a bright and clear real image of the illuminated object on the screen. Generally speaking, the image distance is much larger than the focal length, so the object plane is near the outside of the object-side focal plane of the projection objective. The magnification of a projection objective is an important parameter for measurement accuracy, aperture size, observation range and structural dimensions. The larger the magnification, the higher the measurement accuracy and the larger the objective aperture. When the working distance is fixed, the larger the magnification, the larger the conjugate distance, and the larger the structural dimensions of the projection system. Since it serves to magnify, it is known from optics that the illuminance at the center of the image plane is proportional to the square of the relative aperture, so the method of increasing the relative aperture can be used to increase the illuminance of the image plane.
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