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
Current collector for lead acid battery
Memory with separate read and write paths
Polyamide compositions
Multilayer films having reduced curling
Methods and compositions to treat and detect misfolded-SOD1 mediated diseases
Methods and apparatus for dynamic identification (ID) assignment in wireless networks
Upper surface of a skateboard deck
  Randomly Featured Patents
Combustion apparatus for gas turbine
Electric cart PV panel solar cell layout
Apparatus, system, and method for controlling out-gassing and humidity in a closed space-constrained environment
Mounting plate for a compression mould part
In-ear earphone
Exhaust gas converter device
Electro-optical device and electronic apparatus
Two-piece cushion insert for U-bolt clamp assembly
Surgical instrument storage pack