Light source device
First Claim
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1. A light source device comprising:
- a white LED that emits white light having an emission peak in a blue range; and
an optical filter that partially reduces the quantity of light in the blue range in the white light emitted from the white LED,wherein the optical filter has spectral transmission characteristics in which transmittance is equal to or greater than 5% and equal to or less than 20% in the wavelength range of equal to or greater than 435 nm and equal to or less than 465 nm and is equal to or greater than 80% in the wavelength range of equal to or less than 405 nm and equal to or greater than 490 nm, in the wavelength range of a light source used.
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Abstract
Disclosed is a light source device that has lower costs and lower power consumption compared to a halogen lamp, and has the same spectral characteristics as the halogen lamp. The light source device includes a white LED that emits White light having an emission peak in a blue range and an optical filter that partially reduces the quantity of light in the blue range in the white light emitted from the white LED such that the spectral characteristics of the white light emitted from the white LED are close to those of light emitted from a halogen lamp.
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Citations
2 Claims
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1. A light source device comprising:
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a white LED that emits white light having an emission peak in a blue range; and an optical filter that partially reduces the quantity of light in the blue range in the white light emitted from the white LED, wherein the optical filter has spectral transmission characteristics in which transmittance is equal to or greater than 5% and equal to or less than 20% in the wavelength range of equal to or greater than 435 nm and equal to or less than 465 nm and is equal to or greater than 80% in the wavelength range of equal to or less than 405 nm and equal to or greater than 490 nm, in the wavelength range of a light source used. - View Dependent Claims (2)
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Specification