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
Pharmaceutical compositions of paclitaxel, paclitaxel analogs or paclitaxel conjugates and related methods of preparation and use
Pull through coronary sinus pacing lead
Wake-up radio system
Semiconductor device manufacturing method and device for same
Domestic soda-water preparing device
Fabric care compositions comprising front-end stability agents
Method of making a low-Rdson vertical power MOSFET device
  Randomly Featured Patents
Method and apparatus for interaction with a modulated off-axis electron beam
Process, apparatus and system for encoding video signals using motion estimation
Trimodal microlens
Journal notebook binding machine
Battery having electrode made of polymeric compound having conjugated double bonds
Signal processing device for solid-state imaging device, imaging apparatus having the signal processing device, signal processing method, and program which allow inter-pixel color mixing to be
Method and apparatus for producing a hole in a workpiece
Manufacturing processing for an isolated transistor with strained channel
Projector and method for adjusting projected image