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










Image Number 16 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
Method for forming contact hole
Carbon nanotube fiber spun from wetted ribbon
Interest point detection
Method and system for evaluating/analyzing patent portfolio using patent priority approach
Compounds and compositions for treating chemical warfare agent-induced injuries
Systems and methods for assigning a template to an existing network configuration
Method for detecting motion of an electrical device or apparatus
  Randomly Featured Patents
Powder compacting apparatus
Angled tissue cutting instrument having variably positionable cutting window, indexing tool for use therewith and method of variably positioning a cutting window of an angled tissue cutting in
Job history information auditing system, image forming apparatus, control method, and computer-readable medium
Areal modulator for intensity modulated radiation therapy
Soap bubble blowers
Holding sealing material, exhaust gas purifying apparatus and method for manufacturing exhaust gas purifying apparatus
Process for producing silver halide photographic emulsion
Integrated circuit packaging system with underfill and methods of manufacture thereof
Valve for controlling fluids
Wire brake for a winding machine