Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Compact, fast zoom lens system










Image Number 9 for United States Patent #5267084.

The present invention provides a zoom lens system comprising, in order from the object side, a first lens unit G1 having a positive refracting power; a second lens unit G2 including a front subunit having at least one negative lens and a rear subunit having at least one negative lens and at least two positive lenses located more closely to the image side than said negative lens and having a positive refracting power as a whole, said front and rear subunits having a positive composite power; and a third lens unit G3 having a negative refracting power; said first, second and third lens units including gaps between them, which are variable for zooming from the wide to tele position. This compact, three-unit zoom lens system has a zoom ratio of about 2 or more but, nonetheless, has a small F-number or is fast








 
 
  Recently Added Patents
Memory device and semiconductor device
System for hot-start amplification via a multiple emulsion
Selective thermal treatment of medical instrument portions with thermal treatment system instrument holder
Optical fixing device and image forming apparatus
Systems and methods for optimizing capital structure of a financial institution
Managing aging of silicon in an integrated circuit device
Wind driven generator for vehicles
  Randomly Featured Patents
Method for starting up and loading a combined power plant
Error correction encoding apparatus and error correction encoding method used therein
Resource allocation for rateless transmissions
Method for treating aqueous solution of soybean protein with enzymes
Support leg assistant
Method of operating a cutting burner
Shock absorbing connector
Staple confiner in a stapler
Method of, and a device for, controlling the rotation of an element about an axis by means of a wrap spring
Laser beam image contrast enhancement