Lens system for macro lenses for industrial use introduced for quality assurance in the production process

摘要

INDUSTRIAL APPLICABILITY The present invention is a macro lens for industrial use, which is introduced for quality assurance in a production process, and has an object side lens group, an image side lens group, and one aperture stop located between them. At that time, the object-side lens group includes, from the object side to the image side, a first partial lens group having a positive refractive power, a second partial lens group having a negative refractive power, and a positive partial power. A third partial lens group having a refractive power, wherein the image side lens group has a negative refractive power and a first partial lens group having a positive refractive power from the object side toward the image side. The present invention relates to a macro lens having a second partial lens group having a power and a third partial lens group having a positive refractive power.