Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Screw cover and seal
Ambient adaptive illumination of a liquid crystal display
Process for producing agglomerates of finely particulate iron carriers
Electric wire testing apparatus and electric wire processor equipped therewith
Damper mechanism
Leveraging RFID generated consumer behavior through a web map service
Electrical power connector system including power rail
  Randomly Featured Patents
Circuit for telephone set comprising a light-emitting diode power supply
Combination lock for the shift rod and the hand-brake rod of a car
Liquid crystal display device and method for fabricating the same
Line type indicator for fishing reel
Method for production of an immobilized enzyme preparation by means of a crosslinking agent
Centrifuge with wear resistant outlet openings
Hydraulic actuating device
Restaurant system
Seal assembly for reciprocating shaft
Estimation of lithological properties of a geological zone