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US 10,728,399 B2Granted
Spectral colorimetry apparatus and image forming apparatus to control the number of detection times
AssigneeCanon Kabushiki Kaisha
InventorHitoshi Furukawa
Life of this patent
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Abstract
The spectral colorimetry apparatus includes an LED, a diffraction grating; a line sensor that has multiple pixels and that receives light dispersed by the diffraction grating at the multiple pixels for respective wavelengths of the dispersed light and outputs voltages according to the intensity of the received light; and a sensor CPU that calculates spectral reflectivity of an object based on the intensity of light reflected from the object. The sensor CPU varies, with the multiple pixels, the number of detection times of detecting the light reflected from the object at each pixel.
Claims17
A spectral colorimetry apparatus comprising:
- a light source configured to emit light to an object;
- a spectral unit configured to disperse the light reflected from the object;
- a line sensor having pixels, the line sensor configured to receive the light dispersed by the spectral unit at the pixels for respective wavelengths to output a voltage according to intensity of the light received;
- and
- a control unit configured to calculate spectral reflectivity of the object based on the intensity of the light reflected from the object,
- wherein the control unit controls a first number of detection times at the pixels receiving the light of the wavelengths shorter than a predetermined wavelength so that the first number of detection times is greater than a second number of detection times at the pixels receiving the light of the wavelengths equal to or longer than the predetermined wavelength.
3 more elements
An image forming apparatus comprising:
- a forming unit configured to form a measurement image on a recording material as an object;
- a fixing unit configured to fix the measurement image formed by the forming unit on the recording material;
- a spectral colorimetry apparatus provided downstream of the fixing unit in a conveyance direction of the recording material, the spectral colorimetry apparatus configured to perform colorimetry on the measurement image fixed by the fixing unit onto the recording material;
- and
- a control unit configured to control an image forming condition based on a result of the colorimetry performed by the spectral colorimetry apparatus, the spectral colorimetry apparatus comprising:
- a light source configured to emit light to an object;
- a spectral unit configured to disperse the light reflected from the object;
- and
- a line sensor having pixels, the line sensor configured to receive the light dispersed by the spectral unit at the pixels for respective wavelengths to output a voltage according to intensity of the light received,
- wherein the control unit controls a first number of detection times at the pixels receiving the light of the wavelengths shorter than a predetermined wavelength so that the first number of detection times is greater than a second number of detection times at the pixels receiving the light of the wavelengths equal to or longer than the predetermined wavelength.
7 more elements
A spectral colorimetry apparatus comprising;
- a light source configured to emit light to an object;
- a spectral unit configured to disperse the light reflected from the object;
- a line sensor having pixels, the line sensor configured to receive the light dispersed by the spectral unit at the pixels for respective wavelengths to output a voltage according to intensity of the light received;
- and
- a control unit configured to calculate spectral reflectivity of the object based on the intensity of the light reflected from the object,
- wherein the control unit performs a control of detection at the pixels until a number of detection times for the object reaches a predetermined number of detection times, and after the number of detection times reaches the predetermined number of the detection times, the control unit performs the control of the detection at pixels receiving light of light intensity lower than predetermined intensity among the pixels.
3 more elements
An image forming apparatus comprising:
- a forming unit configured to form a measurement image on a recording material as an object;
- a fixing unit configured to fix the measurement image formed by the forming unit on the recording material;
- a spectral colorimetry apparatus provided downstream of the fixing unit in a conveyance direction of the recording material, the spectral colorimetry apparatus configured to perform colorimetry on the measurement image fixed by the fixing unit onto the recording material;
- and
- a control unit configured to control an image forming condition based on a result of the colorimetry performed by the spectral colorimetry apparatus, the spectral colorimetry apparatus comprising:
- a light source configured to emit light to an object;
- a spectral unit configured to disperse the light reflected from the object;
- and
- a line sensor having pixels, the line sensor configured to receive the light dispersed by the spectral unit at the pixels for respective wavelengths to output a voltage according to intensity of the light received,
- wherein the control unit performs a control of detection at the pixels until a number of detection times for the object reaches a predetermined number of detection times, and after the number of the detection times reaches the predetermined number of the detection times, the control unit performs the control of the detection at pixels receiving light of light intensity lower than predetermined intensity among the pixels.
7 more elements
Dependencies are inferred from the claim text.