US Patent Application 18321051. ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME simplified abstract

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ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME

Organization Name

CANON KABUSHIKI KAISHA==Inventor(s)==

[[Category:Shunji Iwamoto of Tochigi (JP)]]

ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME - A simplified explanation of the abstract

This abstract first appeared for US patent application 18321051 titled 'ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME

Simplified Explanation

The abstract describes a zoom lens design consisting of a front lens unit, intermediate and rear groups.

  • The front lens unit has positive refractive power, meaning it converges light.
  • The intermediate group includes multiple lens units and has a negative combined focal length at the wide-angle end, meaning it diverges light.
  • The rear group includes four lens units with varying refractive powers.
  • The distance between adjacent lens units changes during zooming, allowing for variable magnification.
  • During zooming, the front lens unit, first rear lens unit, and third rear lens unit remain fixed relative to the image plane.
  • During focusing, the second rear lens unit moves relative to the image plane, adjusting the focus of the lens.


Original Abstract Submitted

A zoom lens consists of, in order from an object side to an image side, a front lens unit, intermediate and rear groups. The front lens unit has positive refractive power. The intermediate group includes a plurality of lens units and has a negative combined focal length at a wide-angle end. The rear group includes, in order from the object side to the image side, a first rear lens unit having positive refractive power, a second rear lens unit having negative refractive power, and a third rear lens unit having positive refractive power, and a fourth rear lens unit having negative refractive power. A distance between adjacent lens units changes during zooming. During zooming, the front lens unit, the first rear lens unit, and the third rear lens unit are fixed relative to an image plane. During focusing, the second rear lens unit moves relative to the image plane.

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