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
Combination of a microorganism and a phytosphingosine derivative, composition, methods of use
Process for preparing substituted aromatic carboxylic acids
Integrated multi-sat LNB and frequency translation module
Method of treating a preceramic material
Rupture resistant system
Antennas and their coupling characteristics for wireless power transfer via magnetic coupling
Modular authoring and visualization of rules using trees
  Randomly Featured Patents
Multi-protocol interchip interface
Methods and apparatuses for providing internet-based proxy services
Display device
Test method for verifying correct matching of an exhaust gas oxygen sensor and a vehicle engine
Variable resistor
Obtuse angle range adjustable square assembly
Drop on demand dot matrix printing head
Seesaw ski-track
Stethoscope chestpiece
Cement mixes containing additives for altering the hardening rate of chemically bonded silico-phosphate cements and methods therefor