Image reading device, copier, and image forming apparatus
US-9197775-B2 · Nov 24, 2015 · US
Document reading unit, image forming apparatus incorporating same, and method of detecting original document using with same
US9013759B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9013759-B2 |
| Application number | US-201314141555-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 27, 2013 |
| Priority date | Jan 8, 2013 |
| Publication date | Apr 21, 2015 |
| Grant date | Apr 21, 2015 |
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Abstract
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A document reading unit included in an image forming apparatus and operated with a method of detecting an original document, includes an original document table, a moving irradiation unit having multiple block light sources moving in a sub scanning direction while irradiating the original document, an image sensor receiving reflected light, and a controller that starts a length specifying operation with the moving irradiation unit located at a position facing the original document, sequentially turns on the block light sources, obtains an amount of reflected light under lighting conditions of each block light sources, and determines the length of the original document in the main scanning direction. While the moving irradiation unit is moving in the sub scanning direction, the image sensor receives the reflected light on a region of the original document in the sub scanning direction under each lighting condition during the length specifying operation.
First claim
Opening claim text (preview).
What is claimed is: 1. A document reading unit comprising: an original document table on a surface of which an original document is placed; a moving irradiation unit having multiple block light sources aligned in a main scanning direction of a surface of the original document and to move in a sub scanning direction that is a direction along the surface of the original document table and perpendicular to the main scanning direction while irradiating light emitted by the multiple…
Assignees
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Classifications
Electricity · mapped topic
- H04N1/00708Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9013759B2 cover?
- A document reading unit included in an image forming apparatus and operated with a method of detecting an original document, includes an original document table, a moving irradiation unit having multiple block light sources moving in a sub scanning direction while irradiating the original document, an image sensor receiving reflected light, and a controller that starts a length specifying opera…
- Who is the assignee on this patent?
- Ishida Masatoshi, Ricoh Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H04N1/00708. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 21 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).