Optical element, optical light source unit and optical display device equipped with the optical light source unit
First Claim
Patent Images
1. An optical element operative to provide fluorescent light which comprises:
- a fluorescence luminous element operative to emit fluorescent light when excited by excitation light; and
an optical filter comprising a cholesteric layer formed over said fluorescence luminous element at a side of said fluorescence luminous element at which said excitation light enters said fluorescence luminous element so as to transmit at least partly said excitation light and to reflect at least partly said fluorescent light traveling to said optical filter
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Abstract
An optical element comprises a fluorescence luminous element that emits fluorescent light when excited and a cholesteric filter disposed at the incident side of the fluorescence luminous element at which excitation light enters the fluorescence luminous element. The cholesteric filter comprises a cholesteric layer operative to transmit the excitation light and to reflect backward scattered fluorescent light traveling thereto so as to be integrated with fluorescent light directly coming out of the cholesteric filter.
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Citations
21 Claims
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1. An optical element operative to provide fluorescent light which comprises:
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a fluorescence luminous element operative to emit fluorescent light when excited by excitation light; and
an optical filter comprising a cholesteric layer formed over said fluorescence luminous element at a side of said fluorescence luminous element at which said excitation light enters said fluorescence luminous element so as to transmit at least partly said excitation light and to reflect at least partly said fluorescent light traveling to said optical filter - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical light source unit for providing illumination, which comprises;
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a light source operative to emit excitation light; and
an optical element united with said light source and operative to provide fluorescent light which comprises;
a fluorescence luminous element operative to emit fluorescent light when excited by said excitation light; and
an optical filter comprising a cholesteric layer formed over said fluorescence luminous element at a side of said fluorescence luminous element at which said excitation light enters said fluorescence luminous element so as to transmit at least partly said excitation light and to reflect at least partly said fluorescent light traveling to said optical filter, wherein said optical filter is arranged so that said optical element admit said fluorescent light or both of said fluorescent light and at least part of said excitation light to come out thereof at a side of said fluorescent luminous element - View Dependent Claims (9)
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10. An optical display device for making a display which comprises:
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an excitation light source operative to emit excitation light;
an optical element comprising a fluorescence luminous element operative to emit fluorescent light when excited by said excitation light and an optical filter disposed at a side of said fluorescence luminous element at which said excitation light enters said fluorescence luminous element; and
an light modulating element operative to modulate said fluorescent light emanating from said fluorescence luminous element;
wherein said optical filter comprises a cholesteric layer so as to transmit at least partly said excitation light and to reflect at least partly said fluorescent light; and
is arranged so that said optical element admit said fluorescent light or both of said fluorescent light and at least part of said excitation light to come out thereof at a side of said fluorescent luminous element. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An optical display device for making a display which comprises:
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an excitation light source operative to emit excitation light;
an optical element comprising a fluorescence luminous element operative to emit fluorescent light when excited by said excitation light and an optical filter disposed at a side of said fluorescence luminous element at which said excitation light enters said fluorescence luminous element; and
an light modulating element disposed between said excitation light source and said optical element so as to modulate said excitation light from said excitation light source;
wherein said optical filter comprises a cholesteric layer so as to transmit said excitation light and to reflect at least partly said fluorescent light. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification