Scanning Lens
A scanning objective can be represented by three optical characteristics, namely relative aperture, magnification and conjugate distance. Magnification is an important indicator of a scanning objective. Since the general object size is fixed, a smaller magnification means a smaller image plane of the lens and a shorter focal length, and relatively the scanning system structure can be made smaller, but at the same time the resolution of the lens is required to be higher. Conjugate distance refers to the length between the object and image. For a lens, it is generally hoped to be as long as possible; the shorter the conjugate distance, the harder the lens is to design (increased field angle). Its principle diagram is the same as a photographic objective, which is a process of reduction.
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