Super wide angel lens system using an aspherical lens
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United States of America Patent
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Jan 19, 1999
Grant Date -
N/A
app pub date -
Aug 21, 1997
filing date -
Aug 23, 1996
priority date (Note) -
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Abstract
A retrofocus type super wide angle lens system includes a front lens group of negative power and a rear lens group of positive power, arranged in this order from the object side. The front lens group consists of a negative meniscus first lens element with a convex surface facing the object side and a second lens element having at least one aspherical surface, arranged in this order from the object side. The aspherical second lens element is shaped such that it forms a biconcave lens in the vicinity of the optical axis and forms a negative meniscus lens with a convex surface located on the object side at a peripheral portion thereof.
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