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










Image Number 5 for United States Patent #5412508.

A zoom lens system consists of five lens elements arranged in two groups. Counting from the object side, the first three elements form a front lens group with positive refracting power and the last two elements form a rear lens group with negative refracting power. An airspace is reserved between the front lens group and the rear lens group and it is made variable for zooming. The first lens element in the front lens group is a negative meniscus lens element having its concave lens surface directed toward the object side. Both the second and third lenses in the front lens group are positive lens element. The fourth lens in the rear lens group is positive meniscus lens element, and the fifth lens is a lens element with negative refracting power. In the lens composition, both the front lens group and the rear lens group at least include an aspherical surface respectively.








 
 
  Recently Added Patents
Systems, methods, and media for firewall control via remote system information
Spreading technique applied to broadband mobile communications by satelite relying on DVB-RCS
Adaptive analog echo/next cancellation
Electronic control apparatus
Method and system for Bluetooth low power link layer connection setup
Case of electronic device having antenna pattern embedded therein and mold and method for manufacturing the same
Interconnect, bus system with interconnect and bus system operating method
  Randomly Featured Patents
Hinge for travel string instrument
Method for backside surface passivation of solar cells and solar cells with such passivation
Dome-shaped handheld laser scanner
Method for preparing high resolution wash-off images
Dryer-added fabric treatment article of manufacture containing antioxidant and sunscreen compounds for sun fade protection of fabrics
Call hold state notification across a communications network
Method and apparatus for filling out a form by a machine
Boot for constant velocity universal joint
Plasma process uniformity across a wafer by controlling a variable frequency coupled to a harmonic resonator
Agrotechnical method for training branch cordon vine and for regulation of its growth and yield