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US 2025/0220124 A1Published application
Image reading device and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorAtsushi SUGAI
Life of this patent
Estimating the term…
Abstract
An image reading device includes a visible light source to irradiate a document with a visible light beam, an infrared light source to irradiate the document with an infrared light beam, and multiple mirrors disposed in optical paths of the visible light beam and the infrared light beam from the document to an imaging device. The multiple mirrors include at least a mirror having a reflectance of 93% or more, at a reflection angle of 45°, to a light beam having a wavelength range of 450 nm or more and 900 nm or less.
Claims15
An image reading device comprising:
- a visible light source to irradiate a document with a visible light beam;
- an infrared light source to irradiate the document with an infrared light beam;
- and
- multiple mirrors disposed in optical paths of the visible light beam and the infrared light beam from the document to an imaging device,
- wherein the multiple mirrors include at least a mirror having a reflectance of 93% or more, at a reflection angle of 45°, to a light beam having a wavelength range of 450 nm or more and 900 nm or less.
2 more elements
An image reading device comprising:
- a visible light source to irradiate a document with a visible light beam;
- an infrared light source to irradiate the document with an infrared light beam;
- and
- multiple mirrors disposed in optical paths of the visible light beam and the infrared light beam,
- the multiple mirrors including at least a mirror having a reflectance uniformity of 96% or more, at a reflection angle of 45°, to a light beam having a wavelength range of 450 nm or more and 900 nm or less,
- wherein the reflectance uniformity is defined by a following expression,
- (minimum reflectance/maximum reflectance)×100%.
4 more elements
An image reading device comprising:
- a visible light source to irradiate a document with visible light beam;
- an infrared light source to irradiate the document with an infrared light beam;
- and
- multiple mirrors disposed in optical paths of the visible light beam and the infrared light beam from the document to an imaging device,
- wherein the multiple mirrors include at least a surface reflection mirror made of a metal film material of silver.
2 more elements
Dependencies are inferred from the claim text.