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
Event-triggered server-side macros
Re-establishing push notification channels via user identifiers
Encoding method and encoding device, decoding method and decoding device and transcoding method and transcoder for multi-object audio signals
Control device with adjusting pulse width modulation function and the backlight module thereof
Charging seat having cleaning member
Plants and seeds of hybrid corn variety CH450823
Electrode material and use thereof for production of electrochemical cells
  Randomly Featured Patents
Temperature-responsive electrical switch with sliding contact
Apparatus for diminishing nitrogen oxides
Data retention kill function
Drop-on-demand ink-jet printing head
Imaging tissue deformation using strain encoded MRI
Object oriented data store integration environment for integration of object oriented databases and non-object oriented data facilities
Organic electro-luminescent device
Transesophageal ultrasound probe with imaging element position sensor in scanhead
Hydrogen absorbing alloy and secondary battery
Method of compression-coding a motion picture and an apparatus for same