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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshiaki Komma, Sadao Mizuno, Yasuhiro Tanaka
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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<t2). The difference in optical path length occurring when the blue light passes through the phase level difference is five times the wavelength of the blue light.
An optical element designed for at least two wavelengths of red light and blue light, comprising a phase level difference, wherein a difference in optical path length occurring when the blue light passes through the phase level difference is five times the wavelength of the blue light, and a difference in optical path length occurring when the red light passes through the phase level difference is three times the wavelength of the red light.
An optical lens designed for at least two wavelengths of red light and blue light, comprising a phase level difference, wherein a difference in optical path length occurring when the blue light passes through the phase level difference is five times the wavelength of the blue light, and a difference in optical path length occurring when the red light passes through the phase level difference is three times the wavelength of the red light.
An optical lens comprising a hologram, a refractive lens, and a phase level difference,
An optical lens comprising a hologram, a refractive lens, and a phase level difference,
Dependencies are inferred from the claim text.