17866882. ZOOM LENS, EXTENDER, AND IMAGE PICKUP APPARATUS simplified abstract (CANON KABUSHIKI KAISHA)

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ZOOM LENS, EXTENDER, AND IMAGE PICKUP APPARATUS

Organization Name

CANON KABUSHIKI KAISHA

Inventor(s)

Masato Katayose of Tochigi (JP)

ZOOM LENS, EXTENDER, AND IMAGE PICKUP APPARATUS - A simplified explanation of the abstract

This abstract first appeared for US patent application 17866882 titled 'ZOOM LENS, EXTENDER, AND IMAGE PICKUP APPARATUS

Simplified Explanation

Abstract

A zoom lens is described in this patent application. The lens consists of multiple lens units that can be adjusted to change the distance between them during zooming. The lens units include a combination of positive and negative refractive powers. The rear group of the lens includes a diaphragm, a lens unit with positive refractive power closest to the image plane, and a lens unit with negative refractive power positioned on the object side of the lens unit with positive refractive power. The patent application specifies that a predetermined condition is satisfied.

Bullet Points

  • The patent application describes a zoom lens with adjustable lens units.
  • The lens units include a combination of positive and negative refractive powers.
  • The rear group of the lens includes a diaphragm, a lens unit with positive refractive power closest to the image plane, and a lens unit with negative refractive power positioned on the object side of the lens unit with positive refractive power.
  • A predetermined condition is specified in the patent application.

Potential Applications

  • Photography and videography equipment
  • Surveillance systems
  • Microscopy and scientific imaging
  • Consumer electronics such as smartphones and digital cameras

Problems Solved

  • The zoom lens allows for adjustable focal lengths, providing flexibility in capturing images or videos at different distances.
  • The combination of positive and negative refractive powers in the lens units helps to correct aberrations and improve image quality.
  • The predetermined condition ensures proper alignment and performance of the lens units during zooming.

Benefits

  • Versatility in capturing images or videos at different distances without the need to physically move closer or farther from the subject.
  • Improved image quality with reduced aberrations.
  • Precise alignment and performance of the lens units during zooming, ensuring consistent and reliable results.


Original Abstract Submitted

A zoom lens consists of, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a rear group including a plurality of lens units. A distance between adjacent lens units is changed during zooming. The rear group includes a diaphragm, an n-th lens unit disposed closest to an image plane and having a positive refractive power, and an (n-1)-th lens disposed on the object side of the n-th lens unit and having a negative refractive power. A predetermined condition is satisfied.

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