Resources Contact Us Home
Standard zoom lens

Image Number 11 for United States Patent #5563739.

A zoom lens has a first lens unit having a negative refractive power as a whole, and a second lens unit having a positive refractive power as a whole, and effects zooming by changing the air gap between the first and second lens units. The first lens unit has a first negative meniscus lens with a concave surface having a more intense curvature and facing the image side, a second negative meniscus lens with a concave surface having a more intense curvature and facing the image side, and a positive lens with a convex surface facing the object side. The second lens unit has a positive lens component having at least two positive lenses, a negative lens component, and a positive lens component. At least one of the lens surfaces constituting the first lens unit is an aspherical surface. The zoom lens satisfies the following conditions:

  Recently Added Patents
Cleaning device, and image forming apparatus, process cartridge, and intermediate transfer unit each including the cleaning device
Vehicle front fender
Tricyclic inhibitors of kinases
Flash memory apparatus and method for generating read voltage thereof
Ultra-wideband communication system and method
Controller for machine tool and five-axis simultaneous control machine tool controlled thereby
Case for electronic device
  Randomly Featured Patents
File translation methods, systems, and apparatuses for extended commerce
CPU easy access panels
Cutting apparatus and methods of operation
Solenoid valve for hydraulic brake units with slip control
Method for the production of a semiconductor component having a metallic gate electrode disposed in a double-recess structure
Hydrodynamic cavitation crystallization device and process
Antivibration bar installation apparatus
Phenylene substituted polymeric dialkyl peroxides
System and method for propagating operand availability prediction bits with instructions through a pipeline in an out-of-order processor
Tuned mass damping system and method