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
Phase locking loop
Support for a parameterized query/view in complex event processing
Nucleic acids for cloning and expressing multiprotein complexes
Method and system to generate finite state grammars using sample phrases
Computer device with digitizer calibration system and method
Integrated circuit package system with bonding lands
Lock
  Randomly Featured Patents
Controlled pressure release vessel for microwave assisted chemistry
Oscillator circuit and test apparatus
Production of a parvovirus vaccine in plants as viral coat protein fusions
Methods of testing cancer and anticancer drugs
2-oxoquinoline compounds and pharmaceutical uses thereof
Method for flexibly developing a data processing system comprising rewriting instructions in non-volatile memory elements after function check indicates failure of required functions
System, apparatus and/or method for analyzing light intensities of light reflected from a surface of a sample
Semiconductor storage device and manufacturing method thereof
Glass optical element and method for producing the same
Living body measuring apparatus with built-in weight meter