18353139. 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)

Shunji Iwamoto of Tochigi (JP)

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

This abstract first appeared for US patent application 18353139 titled 'ZOOM LENS AND IMAGE PICKUP APPARATUS

Simplified Explanation

The patent application describes a zoom lens with a first lens unit, a second lens unit, and a rear group with at least four moving lens units. The distances between the lens units change during zooming, with the first lens unit remaining fixed relative to the image plane. The first lens unit consists of at least three lenses with positive refractive powers, and a predetermined condition is satisfied.

  • The zoom lens includes a first lens unit with positive refractive power.
  • A second lens unit with negative refractive power is included in the design.
  • The rear group consists of at least four lens units that move during zooming.
  • Distances between adjacent lens units change during zooming.
  • The first lens unit remains fixed relative to the image plane during zooming and focusing.
  • The first lens unit comprises at least three lenses with positive refractive powers.
  • A predetermined condition is satisfied in the design.

Potential Applications

- Photography lenses - Surveillance cameras - Microscopes - Telescopes

Problems Solved

- Improved image quality during zooming - Enhanced focusing capabilities - Reduction of aberrations in the lens system

Benefits

- Versatile zoom capabilities - High-quality images - Precise focusing - Reduced aberrations


Original Abstract Submitted

A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear group including at least four lens units that move during zooming. Distances between adjacent lens units change during zooming. The first lens unit is fixed relative to an image plane during zooming and during focusing. The first lens unit includes at least three lenses having positive refractive powers. A predetermined condition is satisfied.

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