Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Zoom lens and image pickup apparatus










Image Number 14 for United States Patent #8098301.

Provided is a zoom lens including a first lens group, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, wherein conditional expressions f12/fw>2.0, f2/fw<-2.0, -2.0.ltoreq.f12/f2.ltoreq.-0.5, and .nu.d21-.nu.d22>20 are satisfied, where f12 is a focal length of a single lens having a positive refractive power in the first lens group, f2 is a focal length of the second lens group, fw is a focal length of the total lens system at a wide angle end, .nu.d21 is an Abbe number of the lens having a negative refractive power in the second lens group for the d-line, and .nu.d22 is an Abbe number of the lens having a positive refractive power in the second lens group for the d-line.








 
 
  Recently Added Patents
Process for preparing MDA via the stage of the aminal
Method, base station and system for adjusting cell wireless configuration parameter
Method of controlling semiconductor device, signal processing method, semiconductor device, and electronic apparatus
Managing job execution
Method and apparatus for communication channel error rate estimation
Deposited conductive layers for leads of implantable electric stimulation systems and methods of making and using
Method for radiation sterilization of medical devices
  Randomly Featured Patents
Air ventilation and washing system
Information processing apparatus, information processing method, and storage medium for registering attributes for printing
Bottle
Process for etching oxide films in a sealed photochemical reactor
Stepping exerciser
Gas purification device
Vehicle dashboard
Biodigestible cold-pressed skeet target
Manufacturing method for 4-nitrosoaniline from urea and nitrobenzene
Receiver arrangement with AC coupling