JP2009260410A - Document reading apparatus and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document reading apparatus configured such that contents of image data of a read document are easy to confirm without spoiling elasticity nor whiteness of a document retainer surface. <P>SOLUTION: The document reading apparatus 1 with a document retainer plate 11 which presses a document placed on a document glass 10 and a scanning unit (22) which reads the document to generate document image data corresponding to the document includes an image projector 12 which projects the document image data generated by the scanning unit (22) on a back plate 11a of the document retainer plate 11 while the document retainer plate 11 is opened. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a document reading apparatus that reads a document and generates document image data, and more particularly to a document reading apparatus that can check image data of a read document.

  Various methods have been proposed for confirming whether a document is being read as intended by the user by the document reading device (scanner), and whether the image data of the read document is misaligned or blurred. Yes.

  As an example of the confirmation method, Patent Document 1 discloses an image processing apparatus that displays image data of a document read by a scanner on an operation panel.

Further, in Patent Document 2, electronic paper for displaying image data of a read original is provided on the original pressing surface side of an original pressing plate for pressing a read original, and the original is passed through the electronic paper. An image forming apparatus capable of confirming the image data is disclosed.
JP 2004-72481 A JP 2008-15290 A

However, in the image processing apparatus disclosed in Patent Document 1, since the display area of the operation panel is narrow, it is difficult for the user to confirm the content of the image data of the read document.
Further, when electronic paper is provided on the document pressing surface side of the document pressing plate as in the image forming apparatus disclosed in Patent Document 2, the elasticity and whiteness of the document pressing surface are impaired.

  The present invention has been made in view of such circumstances, and provides a document reading apparatus that can easily check the content of image data of a read document without impairing the elasticity and whiteness of the document pressing surface. Objective.

A first technical means includes: a document pressing plate that presses a document placed on a platen glass; and a scanning unit that reads the document and generates document image data corresponding to the document. An original reading apparatus comprising: a projector that projects original image data generated by the scanning unit onto a surface of the original pressing plate that contacts the original platen glass when the original pressing plate is open.
The second technical means includes an angle detector that detects an inclination angle of the original pressing plate with respect to the original platen glass in the first technical means, and the projector is arranged in accordance with the inclination angle detected by the angle detector. The input document image data is reduced or enlarged with respect to the document image data above the bottom portion projected onto the document pressing plate.
A third technical means is an image forming apparatus comprising the original reading device of the first or second technical means.
According to a fourth technical means, in the third technical means, document image data transmitted by an external device connected to the image forming apparatus is projected onto a surface of the document pressing plate that contacts the document table glass. And

  According to the present invention, it is possible to provide an original reading apparatus in which a user can easily check the content of image data of a read original without impairing the elasticity and whiteness of the original pressing surface.

FIG. 1 is an external view of a document reading apparatus 1 according to the present invention.
Reference numeral 11 denotes a document pressing plate that presses a document placed on the document table glass 10, and a back plate 11 a in contact with the document table glass 10 is a white plate. Further, the back plate 11a is made of an elastic member.

  Reference numeral 12 denotes an image projector, and image data (original image data) of an original placed on the original platen glass 10 generated by a scanning unit described later when the original pressing plate 11 is in an open state is supplied to the original on the original pressing plate 11. It projects on the surface (back plate 11a) in contact with the table glass.

  Reference numeral 13 denotes an operation panel including a liquid crystal touch panel and the like, and the user operates the document reading apparatus 1 via the panel.

  When the user opens the document pressing plate 11, places the document on the document table glass 10, closes the opened document pressing plate 11, and instructs the document reading device 1 to read the document from the operation panel 13, the document reading device 1. Reads the document and generates document image data.

  The generated document image data is projected onto the back plate 11a of the document pressing plate 11 by the image projector 12 as shown in FIG.

Next, details of the document reading apparatus 1 will be described.
3A is a top side view of the document reading device 1 showing a state in which the document pressing plate 11 of the document reading device 1 is closed, and FIG. 3B is a state in which the document pressing plate 11 is opened. FIG. 2 is an upper side view of the document reading apparatus 1 showing.

Reference numeral 11 b denotes a support shaft that pivotally supports the document pressing plate 11 with respect to the document reading device 1.
Further, an angle detector 14 that detects the inclination angle of the document pressing plate 11 with respect to the document table glass 10 is provided coaxially with the support shaft 11b.

  Reference numeral 15 denotes an open / close detector that detects opening / closing of the document pressing plate 11.

4A and 5A are side views of the upper part of the document reading apparatus 1 for explaining the projection state of the document image data described above.
As shown in FIG. 4A, when the relationship of θ1 = θ2 and L1 = L2 is satisfied, for example, an undistorted image P1 shown in FIG. 4B is displayed on the back plate 11a of the pressing plate 11. Is done.

Here, θ1 represents the inclination angle of the document pressing plate 11 with respect to the document table glass 10, and θ2 represents the inclination angle of the lens 12a of the image projector 12 with respect to the document table glass 10.
L1 indicates the distance between the lens 12a of the image projector 12 and the uppermost point U of the back plate 11a of the document pressing plate 11, and L2 indicates the lens 12a of the image projector 12 and the back plate 11a of the document pressing plate 11. The distance from the lowest point D is shown.

However, as shown in FIG. 5A, when θ1> θ2 and L1> L2, a trapezoidally distorted image P2 shown in FIG. 5B, for example, is displayed on the back plate 11a of the pressing plate 11. Will be.
Therefore, in order to correct the vertical trapezoidal distortion generated according to the inclination angle θ1 of the document pressing plate 11, the image data of the image P1 must be corrected and displayed like the image data of the image P3 indicated by the dotted line. The contents (lines and figures) of the images P2 and P3 are not shown.

FIG. 6 is a block diagram of the document reading apparatus 1 capable of correcting the vertical trapezoidal distortion of the image.
The document reading apparatus 1 according to the present invention includes a projection image data generation unit 16, which generates document image data input to the image projector 12 according to the inclination angle θ 1 of the document pressing plate 11. A vertical trapezoidal distortion correction process for reducing or enlarging the original image data above the bottom portion projected onto the original pressing plate 11 is performed and output to the image projector 12.

  The image projector 12 projects an image with the trapezoidal distortion corrected on the back plate 11a of the pressing plate 11 in accordance with the input of the document image data subjected to the image processing.

  Reference numeral 21 denotes a network I / F that provides an interface function to the network N and executes data transmission / reception with a PC, MFP (not shown), etc. connected to the network N.

  The scan unit 22 reads a document placed on the platen glass 10, generates document image data corresponding to the read document, and outputs the generated document image data to the projection image data generation unit 16 / HDD 24.

  Reference numeral 23 denotes a memory for storing various control information, and the HDD 24 records original image data generated by the scanning unit 22 and electronic data such as original image data transmitted from the PC or MFP. Reference numeral 25 denotes a control unit that controls each functional block.

  Here, details of the above-described projection processing and distortion correction processing will be described. Note that the user instructs the document reading apparatus 1 to perform a read document confirmation process via the operation panel 13.

  When the original pressing plate 11 of the original reading apparatus 1 is opened, an original is placed on the original platen glass 10, the opened original pressing plate 11 is closed, and the original reading apparatus 1 is instructed to read the original from the operation panel 13, the scanning unit 22 reads the document, generates document image data, and outputs the document image data to the projection image data generation unit 16.

When the user finishes reading the document and opens the document pressing plate 11 of the document reading device 1, the open / close detector 15 detects the open state of the document pressing plate 11 of the document reading device 1, and generates projection image data. To the unit 16.
The angle detector 14 detects the inclination angle θ 1 of the document pressing plate 11 with respect to the document table glass 10 and outputs the detection result to the projection image data generation unit 16.

  The projection image data generation unit 16 that has received the document image data from the scanning unit 22 and the inclination angle θ1 of the document pressing plate 11 from the angle detector 14, for example, based on the correction table shown in FIG. A predetermined reduction or enlargement process is performed on the original image data input to the original image data above the bottom portion projected onto the original pressing plate 11.

  FIG. 7 shows an example of the correction table 51, 51 a is an angle column in which the inclination angle θ 1 of the document pressing plate 11 from the angle detector 14 is set, and 51 b is a document image input to the image projector 12. This is a reduction ratio column in which the reduction ratio of the horizontal width Lw from the uppermost point U to the lowermost point D of the back plate 11a of the document pressing plate 11 in the data is set. Here, the inclination angle θ2 of the lens 12a of the image projector 12 with respect to the document table glass 10 is 45 °.

The correction process will be described in detail. When the inclination angle θ1 of the document pressing plate 11 detected by the angle detector 14 is 60 °, the projection image data generation unit 16 inputs the document image input to the image projector 12. Regarding the data, the width of the upper side of the original image data corresponding to the uppermost point U of the back plate 11a of the pressing plate 11 is 0.90 times the width of the lower side of the original data corresponding to the lowest point D. The isosceles trapezoidal document image data that has been subjected to correction processing that gradually reduces the reduction ratio of the width of the document image data toward the bottom side is generated.
The projection image data generation unit 16 performs correction to reduce the vertical width of the generated isosceles trapezoidal document image data.
Then, the reduced original image data is output to the image projector 12.

By doing so, the user can easily confirm the content of the read original, and convenience is improved.
Further, the whiteness and elasticity of the back plate (white paper plate) 11a of the document pressing plate 11 are not impaired.

(Other)
In the embodiment described above, the case of θ1> θ2 has been described. However, when θ1 <θ2, the projection image data generation unit 16 performs document image data corresponding to the uppermost point U of the back plate 11a of the pressing plate 11. The isosceles trapezoidal document image data is generated in which the width of the image is larger than the width of the bottom portion of the document data corresponding to the lowest point D.

  Although the opening / closing detector 15 for detecting the opening / closing of the document pressing plate 11 is provided, even if the opening / closing detector 15 is not provided, based on the inclination angle of the document pressing plate 11 detected by the angle detector 14, Opening / closing may be detected.

  The document reading apparatus according to the present invention can be mounted on an image forming apparatus such as an MFP. In this case, the projection image data generation unit 16 performs the above-described correction processing on document image data transmitted from an external device such as a PC connected to the image forming apparatus via the network N.

1 is an external view of a document reading apparatus according to the present invention. It is an image projected on the back plate of the document pressing plate. FIG. 3 is an upper side view of the document reading device. FIG. 3 is an example of an upper side view of a document reading device for explaining a projection state of document image data. FIG. 10 is another example of an upper side view of the document reading device illustrating a projection state of document image data. 1 is a block diagram of a document reading apparatus according to the present invention. It is the figure which showed the table for correction | amendment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Document reading apparatus, 10 ... Document platen glass, 11 ... Document pressing plate, 11a ... Back plate, 11b ... Support shaft, 12 ... Image projector, 12a ... Lens, 13 ... Operation panel, 14 ... Angle detector, 15 DESCRIPTION OF SYMBOLS ... Opening / closing detector, 16 ... Image data generation part for projection, 21 ... Network I / F, 22 ... Scan part, 23 ... Memory, 24 ... HDD, 25 ... Control part, 51 ... Correction table, P1-P3 ... Image .

Claims (4)

In a document reading apparatus comprising a document pressing plate that presses a document placed on a platen glass and a scanning unit that reads the document and generates document image data corresponding to the document.
An original reading apparatus comprising: a projector that projects original image data generated by the scanning unit onto a surface of the original pressing plate that contacts the original platen glass when the original pressing plate is open.   An angle detector for detecting an inclination angle of the original pressing plate with respect to the original table glass is provided, and original image data input to the projector is projected onto the original pressing plate according to the inclination angle detected by the angle detector. 2. The document reading apparatus according to claim 1, wherein the document image data above the bottom side is reduced or enlarged.   An image forming apparatus comprising the document reading device according to claim 1.   4. The image forming apparatus according to claim 3, wherein document image data transmitted from an external device connected to the image forming apparatus is projected onto a surface of the document pressing plate that contacts the document table glass.

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