US Patent Application 18189260. ZOOM LENS AND IMAGE PICKUP APPARATUS simplified abstract
Contents
ZOOM LENS AND IMAGE PICKUP APPARATUS
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ZOOM LENS AND IMAGE PICKUP APPARATUS - A simplified explanation of the abstract
This abstract first appeared for US patent application 18189260 titled 'ZOOM LENS AND IMAGE PICKUP APPARATUS
Simplified Explanation
The abstract describes a zoom lens design that includes multiple lens units that move during zooming. The design also includes a first lens unit that does not move and has a positive refractive power. The refractive index and Abbe number of positive lenses in the first lens unit, as well as the focal lengths and back focus of the zoom lens at different zoom levels, are appropriately set.
- Zoom lens design with multiple lens units that move during zooming
- First lens unit has positive refractive power and does not move
- Refractive index and Abbe number of positive lenses in the first lens unit are set appropriately
- Focal lengths of the zoom lens at wide angle and telephoto ends are appropriately set
- Back focus of the zoom lens at the wide angle end is appropriately set
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 not moving for zooming; at least three lens units moving during zooming; and a final lens unit having a positive refractive power, wherein an interval between adjacent lens units changes during zooming, a refractive index and an Abbe number of positive lenses arranged closest to the object side among positive lenses included in the first lens unit, a focal length of the first lens unit, a focal length of the zoom lens at a wide angle end, a focal length of the zoom lens at a telephoto end, and a back focus of the zoom lens at the wide angle end are appropriately set.
