JP2005202250A - Image reading device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading device in which the adjustment of registration is required only one time. <P>SOLUTION: The mirror scan system image reading device includes: a first running body 4 having a first mirror 11 that reflects light emitted to the image side of a document so that the light is directed parallel to the image side; and a second running body 5 having a second mirror and a third mirror for reflecting light reflected by the first mirror 11 of the first running body 4 so that the light is further reflected to a CCD 15. In the image reading device, an amount of displacement of the right angle of the second running body 5 is inputted, and the position of a scan line during the use of an automatic document feeder is set. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mirror scan type image reading apparatus, and more particularly to an image reading apparatus capable of obtaining an ideal scan line of an automatic document feeder without passing through the automatic document feeder.

In a mirror scan type image reading apparatus that optically reads image information of a document, adjustment of a deviation in the reading start position of the document during book copy is performed by manually setting a book document or the like on a contact glass for reading (registration). Adjustment) is required. When equipped with a DF (automatic document feeder called document feeder) that automatically feeds the originals set on the paper feed onto the contact glass one by one and reads them, Perform resist adjustment. In addition, when an optional DF is attached, it is necessary to adjust the registration at the time of installation. As an image reading apparatus having a function of performing registration adjustment, for example, the technique of Patent Document 1 has been proposed.
JP 2000-151910 A

As described above, in the conventional image reading apparatus, registration adjustment is required for book copy and for DF use, so that a total of two adjustment operations are required. Therefore, the adjustment work is troublesome. Here, as in the general case, the traveling body provided with a mirror that reflects the light applied to the image so as to face the direction parallel to the image plane is called the first traveling body, and the light reflected from the traveling body The traveling body having a mirror for reflecting the light to a predetermined position is called a second traveling body. In the mirror scanning type image reading apparatus, the factor that causes the DF scan line position to vary with respect to the registration position at the time of book copy is A so-called roof angle between two mirrors in the second traveling body for reflecting light from the so-called first traveling body to a predetermined position (an angle in a mirror pair for reflection designed so that the angle formed between them is 90 °). It is only a gap.
Accordingly, the present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide an image reading apparatus that requires only one registration adjustment.

In order to solve the above-described problem, the invention according to claim 1 includes a first traveling body including a mirror that reflects light irradiated onto an image surface of a document so as to face a direction parallel to the image surface; In a mirror scan type image reading apparatus comprising a second traveling body provided with a mirror for further reflecting the light reflected by the mirror of the first traveling body to the image reading means, the roof angle of the second traveling body The most important feature is an image reading apparatus that inputs the amount of misalignment and sets the scan line position when the automatic document feeder is used.
According to a second aspect of the present invention, there is provided a first traveling body including a mirror that reflects the light applied to the image surface of the document so as to be directed in a direction parallel to the image surface, and the mirror of the first traveling body. In a mirror scan type image reading apparatus having a second traveling body provided with a mirror for further reflecting the light reflected by the image reading means, the front end position of the original is detected and the rear end position of the original is detected. Then, based on the detected information on the leading edge position of the document and the trailing edge position of the document, a deviation amount of the roof angle in the second traveling body is calculated, and an automatic document feeder based on the calculated deviation amount of the roof angle An image reading apparatus in which a scan line position at the time of use is set is a main feature.
According to a third aspect of the present invention, the first traveling body including a mirror that reflects the light applied to the image surface of the document so as to face the direction parallel to the image surface, and the mirror of the first traveling body. In a mirror scan type image reading apparatus having a second traveling body provided with a mirror for further reflecting the light reflected by the image reading means, the front end position of the original is detected and the rear end position of the original is detected. Then, based on the detected information on the leading edge position of the document and the trailing edge position of the document, a deviation amount of the roof angle in the second traveling body is calculated, and an automatic document feeder based on the calculated deviation amount of the roof angle An image reading apparatus in which a scan line position at the time of use is set and a white reference adjustment position is set is a main feature.

  According to the present invention, it is possible to set registration (sub-scanning) when using the automatic document feeder only by inputting the deviation amount of the roof angle and adjusting the registration at the time of book copying. Can be done only once.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1A and 1B are diagrams showing an outline of a mirror scan type image reading apparatus. FIG. 1A is a front view showing an arrangement of optical systems and the like, and FIG. 1B is a plan view showing a drive mechanism. On the contact glass 1, a document is set along a left scale reference (regist target position at the time of book copy) 2. When the copy start button is turned on, the motor 3 rotates and the first traveling body 4 and the second traveling body 5 are driven through the gear 6, the timing belt 7 and the flat belt 8.
The first traveling body 4 once goes to the position of the home position sensor 9, from which each set pulse amount (DF (automatic document feeder called document feeder)) / book copy, each resist setting value, white reference position setting Value) The motor 3 rotates and copying and shading are started. An original and a white reference plate are irradiated by a lamp 10, and light enters a CCD 15 as an image reading unit via a first mirror 11, a second mirror 12, a third mirror 13, and a lens 14 to read an image.
In the prior art, the registration position during DF use and book copy is adjusted for each unit due to variations in the first traveling body optical axis, second traveling body optical axis, roof angle, CCD optical axis, and the like. . However, the difference in registration (sub-scanning) value between DF use and book copy is only the influence of roof angle. As shown in FIG. 1, if there is a deviation of the roof angle in the second traveling body 5, the optical axis changes depending on the movement position. The deviation of the roof angle is the value of the portion shown in FIG.
The deviation amount of the optical axis position only due to the influence of the roof angle in the registration adjustment at the time of book copy is the checker roof angle value Δθ (deg), Δθ (rad) = Δθ (deg) / 180 × π, second scanning distance: If L2 = document scanning distance: A / 2, it can be expressed by Equation 1 (see FIG. 3).
Expression 1... Deviation amount: Δh (mm) = second scanning distance: L2 × TAN (2 × Δθ: rad)
Further, the correction amount due to the deviation of the roof angle can be expressed by Equation 2.
Expression 2... Correction amount = Δh (mm) / A (mm) = A / 2 × TAN (2 × Δθ (rad)) / A = TAN (2 × Δθ (rad)) / 2
B = DF scan line target value (on the layout), C = white reference adjustment target position (on the layout), D = distance from the registration position during book copy on the layout to the DF scan line, E = on the layout Distance from registration position to white reference adjustment position at book copy, A ′ = registration (adjustment value) at book copy, D ′ = feed amount from registration adjustment position to DF scan line at book copy, E ′ = Feed amount from registration adjustment position to white reference target position at the time of book copy, B = AD, C = AE, D ′ = D × (1 + correction amount), E ′ = E × (1 + correction amount) Then, the feed amount from the adjustment position at the time of book copy to the DF scan line can be expressed by Equation 3 (see FIG. 4).
Formula 3... DF setting value = A′−D ′ = A′−D × (1 + correction amount)
Furthermore, Formula 3 can be expressed by Formula 5. (Since the feed amount from the home position sensor has to be obtained, the DF scan line set value is given by Equation 5.)
Formula 5 ... A′−D × (1+ (TAN (2 × Δθ (rad))) / 2)
Therefore, by setting the DF in Expression 5, it is possible to set the registration (sub-scanning) when using the DF only by inputting the deviation amount of the roof angle and adjusting the registration at the time of book copying. As a result, the resist adjustment, which is troublesome in the adjustment work, can be completed only once.
The white reference setting position is as shown in Equation 4.
Expression 4... White reference setting position = A′−E ′ = A′−E × (1 + correction amount) = A′−E × (1+ (TAN (2 × Δθ (rad))) / 2)

In the second embodiment, the leading edge position of the document is detected, the trailing edge position of the document is detected, and the deviation amount of the roof angle in the second traveling body 5 is detected based on the detected information on the leading edge position and the trailing edge position of the document. And the scan line position when the automatic document feeder is used is set based on the calculated displacement amount of the roof angle.
In the first embodiment, it is necessary to measure the roof angle and input the roof angle deviation amount. In this example, a chart that can obtain the sub-scanning magnification as shown in FIG. By performing the registration (sub-scanning) adjustment, the adjustment at the time of using the DF can be performed only by the registration adjustment at the time of book copying.
Considering the correction amount calculation formula when the registration adjustment is performed in the chart of FIG. 5, the measured value between YB in scanner reading = YB ′, and the correction amount is as shown in Formula 7.
Expression 7: Correction amount = YB ′ / YB
The DF setting value (Equation 8) is obtained from Equation 3.
Formula 3 DF setting value = A′−D ′
= A′−D × correction amount (Formula 8)
By obtaining the set value in this way, it is possible to set the registration (sub-scan) when using DF. That is, by using a chart capable of obtaining the magnification and performing registration adjustment at the time of book copy, it is possible to set the registration (sub-scan) at the time of using DF at the same time.

In the third embodiment, the leading edge position of the document is detected, the trailing edge position of the document is detected, and the deviation of the roof angle in the second traveling body is determined based on the detected information on the leading edge position and the trailing edge position of the document. This is the case where the amount is calculated, the scan line position when using the automatic document feeder is set based on the calculated amount of deviation of the roof angle, and the white reference adjustment position is set.
In the second embodiment, only the registration (sub-scanning) setting at the time of using the DF can be performed at the same time by adjusting the book copy. However, by executing the equation 9, the DF registration setting and the white reference adjustment position can be set at the same time. Is possible. Equation 9 is derived from Equation 4 below.
Expression 4... White reference setting position = A′−E ′
= A'-E * correction amount ... Equation 9

It is a figure which shows the outline | summary of a mirror scan type image reading apparatus. It is a top view explaining the deviation of the dach angle. It is a top view explaining the amount of shift in the 2nd run. It is explanatory drawing with respect to Formula 3-Formula 5. FIG. It is a figure which shows the chart which can obtain | require subscanning magnification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Contact glass 2 Scale reference 3 Motor 4 1st traveling body 5 2nd traveling body 6 Gear 7 Timing belt 8 Flat belt 9 Home position sensor 10 Lamp 11 1st mirror 12 2nd mirror 13 3rd mirror 14 Lens 15 CCD

Claims (3)

A first traveling body including a first mirror that reflects reflected light from the image surface of the document in a direction parallel to the image surface, and further reflects reflected light from the mirror of the first traveling body to the image reading unit. And a second traveling body including a second mirror and a third mirror, and a mirror scan type image reading apparatus including:
An image reading apparatus, wherein a deviation amount of a roof angle between mirrors constituting the second traveling body is inputted, and a scan line position when using an automatic document feeder is set. A first traveling body including a first mirror that reflects reflected light from the image surface of the document in a direction parallel to the image surface, and further reflects reflected light from the mirror of the first traveling body to the image reading unit. And a second traveling body including a second mirror and a third mirror, and a mirror scan type image reading apparatus including:
A leading edge position and a trailing edge position of the document are detected, respectively, and a deviation amount of the roof angle in the second traveling body is calculated based on the detected information on the leading edge position and the trailing edge position of the document, and the calculated roof angle is calculated. An image reading apparatus characterized in that a scan line position when an automatic document feeder is used is set based on a deviation amount. A first traveling body including a first mirror that reflects reflected light from the image surface of the document in a direction parallel to the image surface, and further reflects reflected light from the mirror of the first traveling body to the image reading unit. And a second traveling body including a second mirror and a third mirror, and a mirror scan type image reading apparatus including:
A leading edge position and a trailing edge position of the document are detected, respectively, and a deviation amount of the roof angle in the second traveling body is calculated based on the detected information on the leading edge position and the trailing edge position of the document, and the calculated roof angle is calculated. An image reading apparatus, wherein a scan line position when an automatic document feeder is used is set based on a shift amount, and a white reference adjustment position is set.

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