Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Zoom lens










Image Number 11 for United States Patent #6646815.

A zoom lens, comprises: three lens groups including a first lens group having a negative refracting power, a second lens group having a positive refracting power and a third lens group having a positive refracting power arranged serially in this order from the object side. The second lens group comprises a positive lens, a cemented lens including a positive lens and a negative lens and one lens arranged serially in this order from the object side. The following conditional expression is satisfied;where f.sub.2 represents a focal length of the second lens group and f.sub.w represents a focal length of the total optical system at a wide-angle end.








 
 
  Recently Added Patents
Cosmetic/dermatological compositions comprising naphthoic acid compounds and polyurethane polymers
Method for preventing wheat from mycotoxin contamination
Heat transfer label for decorating a metal container
System and method for efficient association of a power outlet and device
Organic light-emitting display and method of manufacturing the same
Film-forming resins as a carrier for topical application of pharmacologically active agents
Method and laser receiver for acoustically indicating a laser beam
  Randomly Featured Patents
Apparatus for positioning and damping tubes or pipelines
Electrostatographic toners and developers containing new charge-control agents
Electric motor controlling relay
Substrate treating method
Aluminate phosphor containing bivalence metal elements, its preparation and the light emitting devices incorporating the same
Method for performing place-and-route of contacts and vias in technologies with forbidden pitch requirements
Image handling using a voice tag
Agitator thruster for an automatic washer
Luggage with wheels and raised rails
Mobile terminal