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
Signal processing device and method for providing oscillating signal in the signal processing device
Flat display panel and method for forming the same
Controlling ring-back tone output prior to a communication connection in mobile terminal
Data communication system, data transmitting apparatus, data transmitting method, and method for determining packet size and redundancy
Battery structures and related methods
Superconducting magnetizer
Buckle (tube)
  Randomly Featured Patents
Method of manufacturing motor vehicle door
Sheet material for thermal transfer imaging
System for collecting oil
Core monitoring device with pressurized inner barrel
Method for making electrically programmable memory device by doping the floating gate by implant
Mobile station, a base station, a mobile communication system and a communication control method
Method of fabricating thermooptic tunable wavelength filter
Southern live oak tree named `Cannon-Sharp`
Illuminated flag and support therefor