Color measurement device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsShun-ichi Ebihara, Hiroshi Kita, Tatsuya Kobayashi
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Abstract
The color measurement device and an image forming apparatus using the same includes a light source for irradiating a color measurement object with white light; a diffraction grating for dispersing the light reflected from the color measurement object; and a line sensor formed of multiple pixels that generate an electric signal corresponding to the intensity of the light dispersed by the diffraction grating, wherein the light source includes a light-emitting diode having a peak value of emission intensity in a wavelength zone of 380 nm to 420 nm, and a plural types of fluorescent members each having a peak value of fluorescence intensity in a wavelength zone of 420 nm to 730 nm.
Claims7
A color measurement device comprising:
- a light source for irradiating a color measurement object with light;
- a spectral unit for dispersing the light reflected from the color measurement object;
- and
- a light detection unit including multiple pixels, the light detection unit generating an electric signal corresponding to the intensity of the light dispersed by the spectral unit,
- wherein the light source includes a light-emitting diode having a peak value of emission intensity in a near-ultraviolet region whose range is not less than 380 nm and not more than 420 nm, and a plural types of fluorescent members each having a peak value of fluorescence intensity in a wavelength zone that is not less than 420 nm, and not more than 730 nm,
- wherein the light source has a luminescence spectrum of which the lowest intensity in a wavelength zone that is equal to or more than 400 nm, or equal to or less than 700 nm is 20% or more of the maximum intensity.
Dependencies are inferred from the claim text.