Resources Contact Us Home
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
Image processing system, image processing apparatus, control method for image processing apparatus, and storage medium
Method and apparatus for focusing electrical stimulation in the brain during electro-convulsive therapy
LED string with a capability to maintain a current path and LED unit thereof
System for non-destructive image processing
Television apparatus
Serial transmission system including transmitter apparatus and receiver apparatus, for use in transmission of AV data
Method for forming pattern
  Randomly Featured Patents
Fastener and fabrication method therefor
Techniques for measuring ion beam emittance
Electronic dictionary
Secure handling of stored-value data objects
Splicing apparatus and process
System and method for timestamps for media stream data
Adjustable steering shaft
Method of manufacturing a CMOS image sensor
Spread spectrum coding method and apparatus thereof
System and method for forecasting portfolio losses at multiple horizons