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
Maintenance guidance display device, maintenance guidance display method, and maintenance guidance display program
Multiple RF band operation in mobile devices
Method of reducing acetaldehyde in polyesters, and polyesters therefrom
Vehicle exterior
Switchable solvents and methods of use thereof
Active pellet without chemical additives
System and method for determining a characterisitic of an object adjacent to a route
  Randomly Featured Patents
Vibratory tumbling apparatus with reduced force transmission
Bearing a spinning rotor of an open-end spinning apparatus
Synchronization of electrical stimulation therapy to treat cardiac arrhythmias
Mycobacterium primers and probes
Work and feed control system for cutting machines
Programmable multistage lensless optical data processing system
Reversible window
Voice and data exchange over a packet based network with AGC
Identification tag for real-time location of people
Connector with sliding cam