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
Power control arrangement for long term evolution time division duplex method and apparatus
Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp
Security patch update processor
Steering wheel
Scalable packet processing systems and methods
Atomic oscillator and manufacturing method
System for alarming upon occurrence of secession of smart key for vehicles
  Randomly Featured Patents
Color television display system having improved convergence
Processing unit with an improved ability to coordinate the execution of multiple tasks with varying priorities
Active matrix substrate and display device
Shoe for cross-country running and cross-country ski
Vanity mirror
Gas separator for liquid dispensing device
Animal transport device
Process for the production of electrolyte capacitors
Domino coaster
Non-absorbent tampon containing additives inhibiting TSST-1