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
Social community generated answer system with collaboration constraints
Antenna for an automobile
Variety corn line KDC7040
Controlling access to resources on a network
Polypeptide microparticles
Metal foil laminate, substrate for mounting LED, and light source device
Hermetically sealed atomic sensor package manufactured with expendable support structure
  Randomly Featured Patents
Ornamental design for a watch
Method for planning and performing a magnetic resonance examination, magnetic resonance appliance and coil unit
Display-integrated tablet device
Resorbable materials based on independently gelling polymers of a single enantiomeric lactide
Putting aid for aiding a golfer in property aligning the golfer's line of sight, putting stroke and club head angle
Tandem axle carrier structural rib
Metal oxide particles
Routing power and ground vias in a substrate
Terminal structure of switch
Catheter having a low-friction guidewire lumen and method of manufacture