Resources Contact Us Home
Zoom lens and optical device using the same

Image Number 5 for United States Patent #6587280.

A zoom lens comprises a first lens unit having positive refractive power, a second lens unit having negative refractive power, an aperture stop, a third lens unit having positive refractive power and kept fixed during zooming, a fourth lens unit having positive refractive power, and a fifth lens unit having negative refractive power, which are arranged in this order from an object side. In zooming from a wide-angle end to a telephoto end, the second lens unit is moved toward an image plane side such that a spacing between the first lens unit and the second lens unit is increased, and the aperture stop is also moved.

  Recently Added Patents
Wire catalyst for hydrogenation/dehydrogenation reaction and manufacturing method therefor
System, method and apparatus for pausing multi-channel broadcasts
Dental fillers including a phosphorus containing surface treatment, and compositions and methods thereof
Managing method and apparatus for servicing contents provided by content provider
Refuelable battery-powered electric vehicle
Image display device and method of changing first EDID with second EDID wherein the second EDID information is compatible with image display device
Dimmable LED light fixture having adjustable color temperature
  Randomly Featured Patents
Ink, ink set, ink cartridge, recording unit, image recording method and image recording apparatus
In-line system for processing textile material
Developer container for an image forming apparatus
Method for imaging and differential analysis of cells
Organic light emitting display (OLED) having a gas vent groove to decrease edge open failures
Multilayer circuit structure build up method
Tip holder
High power classification for power over Ethernet
Method for multilevel printing of digital images using reduced colorant amounts
Amorphous-polypropylene-based hot melt adhesive