17971780. ZOOM LENS AND IMAGE PICKUP APPARATUS simplified abstract (CANON KABUSHIKI KAISHA)

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ZOOM LENS AND IMAGE PICKUP APPARATUS

Organization Name

CANON KABUSHIKI KAISHA

Inventor(s)

Akihiko Yuki of Saitama (JP)

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

This abstract first appeared for US patent application 17971780 titled 'ZOOM LENS AND IMAGE PICKUP APPARATUS

Simplified Explanation

The abstract describes a zoom lens design for cameras or other optical devices. The lens consists of several lens units that move to adjust the zoom level. The first lens unit remains fixed during zooming, while the second and at least two other lens units move. The final lens unit, closest to the image side, also remains fixed during zooming.

  • The zoom lens includes multiple lens units that move to adjust the zoom level.
  • The first lens unit does not move during zooming, while the second and at least two other lens units do.
  • The final lens unit, closest to the image side, also remains fixed during zooming.
  • The first lens unit includes three sub-lens units, with the second and third sub-lens units responsible for focusing.
  • The distance between the second and third sub-lens units changes to achieve focusing.
  • The design satisfies predetermined inequalities.

Potential applications of this technology:

  • Camera lenses for digital cameras, DSLRs, or mirrorless cameras.
  • Zoom lenses for video cameras or camcorders.
  • Optical devices requiring adjustable zoom capabilities.

Problems solved by this technology:

  • Provides a compact and efficient zoom lens design.
  • Allows for smooth and precise zooming and focusing.
  • Reduces the complexity and size of the lens system.

Benefits of this technology:

  • Improved image quality and sharpness throughout the zoom range.
  • Compact and lightweight design for easier portability.
  • Enhanced control over zooming and focusing for photographers and videographers.
  • Cost-effective manufacturing due to simplified lens configuration.


Original Abstract Submitted

A zoom lens includes, in order from an object side to an image side, a first lens unit that has a positive refractive power and does not move for zooming, a second lens unit that has a negative refractive power and moves in zooming, at least two lens units that move in zooming, and a final lens unit that has a positive refractive power, is disposed closest to the image side, and does not move for zooming. The first lens unit includes, in order from the object side to the image side, a first sub-lens unit that has a negative refractive power and does not move for focusing, a second sub-lens unit that has a negative refractive power and moves for focusing, and a third sub-lens unit having a positive refractive power. A distance between the second sub-lens unit and the third sub-lens unit changes for focusing. Predetermined inequalities are satisfied.

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