Lens system having a good image performance for white light
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 7, 1989
Grant Date -
N/A
app pub date -
Aug 26, 1986
filing date -
Aug 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lens system has a lens unit comprising a positive lens and a negative lens. The positive lens has an index distribution in the direction of the optic axis. The value of the index gradient for a light having a short wavelength in the vicinity of the vertex of at least one convex surface of the positive lens is smaller than the value of the index gradient for a light having a long wavelength.
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