Scan Lens
A scanning objective lens can be described by three optical characteristics, namely relative aperture, magnification, and conjugate distance. Magnification is an important indicator of a scanning objective lens. Since the object size is generally fixed, the smaller the magnification, the smaller the image plane of the lens and the shorter the focal length; relatively speaking, the scanning system structure can be made smaller, but at the same time the resolving power of the lens is required to be higher. Conjugate distance refers to the length between object and image. For a lens, it is generally hoped to be as long as possible; the shorter the conjugate distance, the more difficult the lens is to design (the field of view increases). Its schematic diagram is the same as that of a photographic objective, being a process of reduction.
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