Resources Contact Us Home
Wide-angle, high-zoom-ratio zoom lens

Image Number 7 for United States Patent #7177092.

The invention relates to a four- or five-group zoom lens that ensures wide-angle performance, high zoom ratios and high quality with a more reduced number of lenses than ever before. The zoom lens comprises, in order from its object side, a first lens group G1 having positive power, a second lens group G2 having negative power, a third lens group G3 having positive power, a fourth lens group G4 having negative power and a fifth lens group G5 having positive power. The fourth lens group G4 comprises one lens. For zooming, all the spacings between the respective lens groups vary and the first lens group G1 moves in such a way as to arrive at the object side at the telephoto end position rather than at the wide-angle end position.

  Recently Added Patents
Electromagnetic sensor cable and electrical configuration therefor
Catheter with multiple electrode assemblies for use at or near tubular regions of the heart
Servomotor control circuit
Apparatus and method for extracting cascading style sheet rules
Sensing device and electronic apparatus
Micromechanical component, device for beam deflection of monochromatic light, and spectrometer
Electrical converter with variable capacitor
  Randomly Featured Patents
Universal die detachment apparatus
Image forming apparatus, and processing unit and latent image writing device mounted therein
Device for positioning a semi-conductor wafer
Ambient temperature mix, cast, and cure composite propellant formulations
Article of consumption and image forming apparatus having the same
Multiple input, multiple output antenna for handheld communication devices
Light reflective bicycle safety device and method of making the same
Indication display unit for a vehicle
Water vacuum break assembly and method for selectively accommodating multiple control systems
Socket connector structure