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
Synergistic fungicidal interactions of 5-fluorocytosine and other fungicides
Human and mouse targeting peptides identified by phage display
System and method for configuring a direct lift control system of a vehicle
Organic metal complex and its use in organic electroluminescent device
Ventilated vacuum commutation structure
Dynamically updating privacy settings in a social network
Control device for radiation imaging apparatus and control method therefor
  Randomly Featured Patents
System and method for generating a frameless web display
Copier with sorter
Hog ring clamping device
Voltage regulating circuit, in particular for semiconductor memories
Control circuitry for a tape cassette telephone answering device
Method and apparatus for synthesizing a single crystal of indium phosphide
Crosslinked aromatic polyamide film and process for producing the same
Image forming apparatus
Copying machine
Resealable closure mechanism having slider device and methods