Optical element, optical lens, optical head apparatus, optical information apparatus, computer, optical information medium player, car navigation system, optical information medium recorder, and optical information medium server
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United States of America Patent
Stats
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Jul 24, 2007
Grant Date -
Jun 10, 2004
app pub date -
Nov 18, 2003
filing date -
Nov 25, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An optical lens includes a hologram, a refractive lens, and a phase level difference. The hologram has a sawtooth shape grating having a sawtooth shape in cross-section, and generates +2nd-order diffracted light most strongly with respect to blue light and +1st-order diffracted light most strongly with respect to red light, by setting a height of the sawtooth shape grating. The +2nd-order diffracted light of blue light is condensed through a substrate with a thickness t1, and the +1st-diffracted light of red light is condensed through a substrate with a thickness t2 (t1
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