Illumination device and image display apparatus
First Claim
1. An illumination device comprising:
- an excitation light source configured to emit excitation light via an excitation light path, the excitation light having a spectrum that includes a first peak wavelength;
a fluorescent portion including,a fluorescent substance that, responsive to irradiation by the excitation light, emits emission light having a spectrum with a second peak wavelength that is different from the first peak wavelength, anda reflective section provided opposite a portion of the fluorescent substancethe fluorescent portion being rotatably driven by a motor;
a spectral optical system configured to transmit the excitation light and to reflect the emission light; and
a condensing optical system provided between the excitation light source and the fluorescent portion, the excitation light and the emission light passing through the condensing optical system.
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Accused Products
Abstract
An illumination device includes: an excitation light source that emits excitation light having a first wavelength; and a fluorescent member that includes a fluorescent substance that, when it is irradiated with the excitation light, emits light having a second wavelength longer than the first wavelength, transmits a part of the excitation light and reflects another part of the excitation light, and a first reflective film provided at a side of the fluorescent substance, which is opposite to an excitation light incidence side, the fluorescent member emitting multiplexed light including an excitation light component reflected from the fluorescent substance and the first reflective film and a light component emitted from the fluorescent substance.
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Citations
15 Claims
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1. An illumination device comprising:
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an excitation light source configured to emit excitation light via an excitation light path, the excitation light having a spectrum that includes a first peak wavelength; a fluorescent portion including, a fluorescent substance that, responsive to irradiation by the excitation light, emits emission light having a spectrum with a second peak wavelength that is different from the first peak wavelength, and a reflective section provided opposite a portion of the fluorescent substance the fluorescent portion being rotatably driven by a motor; a spectral optical system configured to transmit the excitation light and to reflect the emission light; and a condensing optical system provided between the excitation light source and the fluorescent portion, the excitation light and the emission light passing through the condensing optical system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An illumination device, comprising:
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an excitation light source configured to emit excitation light via an excitation light path, the excitation light having a spectrum that includes a first peak wavelength; a rotatable fluorescent member, the rotatable fluorescent member having a first side and a second side opposite the first side, the first side arranged so to be irridiated by the excitation light, the rotatable fluorescent member further including a fluorescent substance disposed on a portion of the first side, the fluorescent substance being responsive to irradiation by the excitation light so as to emit emission light having a spectrum with a second peak wavelength that is different from the first peak wavelength, and a reflective section provided along a portion of the fluorescent member so as to reflect a portion of the excitation light irradiating the fluorescent substance, a spectral optical system configured to transmit the excitation light and to reflect the emission light; and a condensing optical system provided between the excitation light source and the fluorescent member, the excitation light and the emission light passing through the condensing optical system. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification