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Spectroscopic characteristics acquisition unit, image evaluation unit, and image forming apparatus

Active Publication Date: 2011-09-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this, in figure 1 In the structure shown, there may be an error between the obtained results of the spectral characteristics at the center of the sensitive area and the obtained results of the spectral characteristics at the ends of the sensitive area due to the off-angle spectral characteristics.

Method used

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  • Spectroscopic characteristics acquisition unit, image evaluation unit, and image forming apparatus
  • Spectroscopic characteristics acquisition unit, image evaluation unit, and image forming apparatus
  • Spectroscopic characteristics acquisition unit, image evaluation unit, and image forming apparatus

Examples

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Embodiment

[0093] Figure 5 and Figure 6 An example of the spectral characteristic acquisition device of the present invention is shown. in, Figure 5 A front view schematically showing the structure of the spectral characteristic acquisition device 1-100, Figure 6 yes Figure 5 The side view of the spectral characteristic acquisition device 1-100 is shown. The x direction, y direction, and z direction used in the following description are coordinate directions shown in the drawings.

[0094] exist Figure 5 and Figure 6 Among them, the image on the image-carrying medium such as paper etc. 1-101 is subjected to the linear irradiation spread on the whole sensing area by the light irradiation device, and the light irradiation device is formed by the linear illumination source 1-102 formed by LED (Light Emitting Diode) array and Lens 1-103 constitutes. As for the line illumination light source 1-102, for example, an array of white LEDs having intensity in almost all visible light...

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Abstract

The invention relates to a spectroscopic characteristics acquisition unit, an image evaluation unit, and an image forming apparatus. The spectroscopic characteristics acquisition unit includes a light emitting unit to illuminate a measurement target; a lens array including lenses to receive reflected light reflected from the measurement target; a light blocking member having a pinhole array including openings; a focusing unit to focus light coming from the pinhole array; a diffraction unit to diffract the light to different directions depending on wavelength of light received by the focusing unit; and a light receiving unit to receive the reflected light diffracted by the diffraction unit. The light receiving unit includes a spectroscopic sensor array having spectroscopy sensors including pixels. Each of the lenses constituting the lens array corresponds to one of the openings of the pinhole array. The numerical aperture NA of the lens in the arrangement direction in the lens array satisfies the formula NA>sin ( max) with respect to the maximum angle of view max of the focusing unit.

Description

technical field [0001] The present invention relates to a spectroscopic characteristic acquisition device, which has a spectroscopic sensor array for linearly acquiring spectroscopic data of an object to be read, and acquires the spectral reflectance of a full-width image for color detection. The images formed on the image mounting medium were evaluated. The present invention also relates to an image evaluation device provided with the spectral characteristic acquisition device for evaluating output results of an image forming device, and an image forming device equipped with the image evaluation device. Background technique [0002] There are currently various image forming apparatuses, including printers, copiers, facsimile machines equipped with printers and copiers and having a communication function, digital multifunction machines, printing machines, and the like. These devices employ various image forming methods such as an electrophotographic method, an inkjet method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B3/08G03G15/00
CPCG01J3/0205G01J3/2803G01J3/502G01J3/02G01J3/0229
Inventor 濑尾学上条直裕新保晃平窪田阳一
Owner RICOH KK
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