18347616. ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME simplified abstract (CANON KABUSHIKI KAISHA)

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ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME

Organization Name

CANON KABUSHIKI KAISHA

Inventor(s)

Makoto Nakahara 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 18347616 titled 'ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME

Simplified Explanation

The abstract describes a zoom lens system that consists of a first lens unit with negative refractive power, a second lens unit with positive refractive power, and a rear group with one or more lens units. The distances between the lens units change during zooming. The first lens unit includes three or more negative lenses, while the second lens unit includes a positive lens that moves from the object side to the image side during focusing. A predetermined condition is satisfied.

  • The zoom lens system includes a first lens unit with negative refractive power, a second lens unit with positive refractive power, and a rear group with one or more lens units.
  • The distances between the lens units change during zooming.
  • The first lens unit consists of three or more negative lenses.
  • The second lens unit includes a positive lens that moves from the object side to the image side during focusing.
  • A predetermined condition is satisfied.

Potential Applications:

  • Photography and videography: The zoom lens system can be used in cameras and camcorders to provide variable focal lengths and zoom capabilities.
  • Surveillance systems: The zoom lens system can be utilized in security cameras to allow for flexible zooming and focusing on specific areas of interest.
  • Microscopy: The zoom lens system can be applied in microscopes to enable adjustable magnification levels and precise focusing.

Problems Solved:

  • Variable focal lengths: The zoom lens system solves the problem of fixed focal lengths by allowing users to adjust the zoom level and focal length according to their needs.
  • Flexible focusing: The system addresses the issue of limited focusing capabilities by providing a positive lens that can move during focusing, allowing for sharp focus at various distances.
  • Compact design: The inclusion of multiple lens units in the system enables a compact and lightweight design, making it suitable for portable devices.

Benefits:

  • Versatility: The zoom lens system offers a wide range of focal lengths, allowing users to capture different perspectives and achieve desired compositions.
  • Enhanced image quality: The combination of negative and positive lenses helps to correct optical aberrations and improve image sharpness and clarity.
  • Portability: The compact and lightweight design of the zoom lens system makes it convenient for use in portable devices, reducing the overall size and weight of the equipment.


Original Abstract Submitted

A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, and a rear group including one or more lens units. Distances between adjacent lens units change during zooming. The first lens unit includes, in order from the object side to the image side, three or more negative lenses. The second lens unit consists of a positive lens configured to move from the object side to the image side during focusing from infinity to a close distance. A predetermined condition is satisfied.

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