Resources Contact Us Home
Zoom lens system

Image Number 3 for United States Patent #5357374.

A zoom lens system consisting of three groups, wherein intervals between the groups are varied to thereby change a focal length. In this zoom lens system, the number of lenses constituting the groups is one, respectively. That is, a first group is constituted by a convex meniscus lens 11, a second group is constituted by a negative meniscus lens 12 directing a strong positive surface thereof toward an object and a third group is constituted by a negative meniscus lens 13 directing a strong convex surface thereof toward the object, whereby the number of the constituting lenses can be minimized to be three, and, because of the zoom lens system consisting of the three groups, the movement of the lens is scattered, so that the movement value of the lens for obtaining a desirable zooming ratio can be decreased.

  Recently Added Patents
Refractive optics and projection display apparatus
Providing autocomplete suggestions
Twin vertical-axis wind turbine with automatic wind tracking
System and method for handling data transfers
Automated aseptic sampling workstation and sample collection devices therefore
Lock-out, tag-out system using safety network
Outdoor fireplace
  Randomly Featured Patents
Orthopedic device for stabilizing the scroiliac
Tong wrench with tactile torque indication
Fuel feed control device for internal combustion engine
Dioxiranyl tetraoxaspiro [5.5] undecanes
Plasma processing apparatus
Solar concentrator utilizing a point focusing solar concentrating panel assembly
Radio frequency tag
Brake pressure control arrangement
Method for sulfuric acid resist stripping