Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Leg mounted portable computer
Security access protection for user data stored in a cloud computing facility
Methods and systems for optimizing data accesses
Moving structure and micro-mirror device using the same
System for the secure management of digitally controlled locks, operating by means of crypto acoustic credentials
Centralized behavioral information system
Luminescent nanosheets, and fluorescent illuminators, solar cells and color displays utilizing the same as well as nanosheet paints
  Randomly Featured Patents
Welding auto-darkening filter
Cubic-metric based frequency selective precoding for uplink in MIMO communication system
Method of making a sleeping box
Method for controlling an electric driving motor of an adjusting device pertaining to a motor vehicle
Water conservation device, kit and method of using
Force transmitting apparatus
System and method for providing audible messages in replacement of telephone tones
User programmable redundant memory
Flow-control valve assembly
Vapor-compression evaporative air conditioning systems and components