18504947. ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME simplified abstract (CANON KABUSHIKI KAISHA)
Contents
ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME
Organization Name
Inventor(s)
Yasuaki Hagiwara 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 18504947 titled 'ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME
Simplified Explanation
The patent application describes a zoom lens system with multiple lens units that move relative to each other during zooming, satisfying a predetermined condition.
- First lens unit has positive refractive power
- Second lens unit has negative refractive power
- Third lens unit has positive refractive power
- Rear unit includes lens units with negative and positive refractive powers
- Distances between adjacent lens units change during zooming
- First lens unit moves towards object side during zooming
- Second lens unit initially moves towards image side and then towards object side
- Predetermined condition is satisfied during zooming
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- Potential Applications
- Photography lenses
- Surveillance cameras
- Microscopes
- Telescopes
- Problems Solved
- Maintaining image quality during zooming
- Achieving desired magnification levels
- Minimizing aberrations in images
- Benefits
- Improved image quality
- Versatile zoom capabilities
- Enhanced optical performance
Original Abstract Submitted
A zoom lens includes, 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, a third lens unit having a positive refractive power, and a rear unit that includes a plurality of lens units having negative refractive powers and a plurality of lens units having positive refractive powers, each distance between adjacent lens units changing during zooming. During zooming from a wide-angle end to a telephoto end, the first lens unit moves to the object side, and the second lens unit moves to the image side and thereafter moves to the object side. A predetermined condition is satisfied.
