Reading device, image processing device and reading method

By using an illumination and imaging system with a background unit featuring an invisible light absorption layer and multiple white resin layers, the image reading device achieves enhanced whiteness and luminance while maintaining the necessary reflectance characteristics for invisible light.

JP2025080868APending Publication Date: 2025-05-27RICOH CO LTD
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Patent Information

Application Number
JP2023194217
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-11-15
Publication Date
2025-05-27

AI Technical Summary

Technical Problem

Existing image reading devices face challenges in increasing whiteness and luminance while maintaining a background portion that reflects invisible light at a lower reflectance than visible light, due to issues such as peeling and insufficient light resistance.

Method used

The implementation of an illumination unit that irradiates visible and invisible light, an imaging unit that captures both types of images, and a background unit with an invisible light absorption layer and multiple white resin layers, where the upstream white resin layer has higher light resistance to visible light.

Benefits of technology

This configuration effectively increases whiteness and luminance while maintaining the required reflectance characteristics for invisible light, preventing peeling and secular deterioration of the background portion.

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Abstract

To improve whiteness and luminance even in a background part where invisible light is reflected with a lower reflection factor in relative to visible light.SOLUTION: A reading device comprises: a lighting section which irradiates a subject with visible light and invisible light; an imaging section which receives visible light and invisible light reflected by the subject and picks up a visible image and an invisible image; and a background part which is provided within an imaging range of the imaging section and in which at least visible light is reflected. The background part includes: an invisible light absorption layer which absorbs invisible light; and a plurality of white resin layers provided at a downstream side of light from the lighting section in an incidence direction with respect to the invisible light absorption layer. In the plurality of white resin layers, regarding a white resin layer which is provided at a most upstream side of light from the lighting section in the incidence direction, light resistance with respect to visible light is higher than the other white resin layers.SELECTED DRAWING: Figure 4
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Citation Information

Patent Citations

  • Method and device for detecting original

    JP1996139848A