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
Content reproduction apparatus and content processing method therefor
Printable and printed articles
Organic electroluminescent element
Detection system and method for mobile device application
Transmitting a synchronizing signal in a packet network
Performance venue with dynamic mechanical load management system and method
  Randomly Featured Patents
Data card with rotatable connector and rotatable connector for data card
Apparatus and method for regulating the operation of a torque transmission system between a driving unit and a transmission in a motor vehicle
Enabling relational databases to incorporate customized intrusion prevention policies
Apparatus and method for preventing free flow in an infusion line
Method for approximating a value which is a nonlinear function of the linear average of pixel data
Inorganic bone adhesion agent and its use in human hard tissue repair
Container securement device and system
Billet lower control arm
Printed circuit board-connecting connector
Quantization error reduction in PWM full-MASH converters