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










Image Number 11 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
Optical article comprising a temporary anti-fogging coating with improved durability
Semiconductor IC including pulse generation logic circuit
Multi-domain dynamic group virtual private networks
System and method for optimizing teams
Method for installing industrial components in an environment
Receiver with feedback continuous-time delta-sigma modulator with current-mode input
Frothable aqueous composition for use in a carpet backing composition
  Randomly Featured Patents
Fuel charging system for high performance vehicles
Packaging container for dental articles
Brush
Process for the manufacture of integrated devices with gate oxide protection from manufacturing process damage, and protection structure therefor
Engine charge air conditioning system with multiple intercoolers
Steep absorption edge filter glass
Apparatus for characterizing fiber Bragg gratings
Device for aiding detection of submerged body
Fluid circulating pad
Method for repairing resistance spot welds in aluminum sheet materials