JPH1056542A - Image reader - Google Patents

Image reader

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Publication number
JPH1056542A
JPH1056542A JP8229301A JP22930196A JPH1056542A JP H1056542 A JPH1056542 A JP H1056542A JP 8229301 A JP8229301 A JP 8229301A JP 22930196 A JP22930196 A JP 22930196A JP H1056542 A JPH1056542 A JP H1056542A
Authority
JP
Japan
Prior art keywords
dust
reading
document
means
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8229301A
Other languages
Japanese (ja)
Inventor
Junichi Tanigawa
淳一 谷川
Original Assignee
Ricoh Co Ltd
株式会社リコー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd, 株式会社リコー filed Critical Ricoh Co Ltd
Priority to JP8229301A priority Critical patent/JPH1056542A/en
Publication of JPH1056542A publication Critical patent/JPH1056542A/en
Pending legal-status Critical Current

Links

Abstract

(57) Abstract: An object of the present invention is to provide an image reading apparatus which detects the attachment of dust to a contact glass or the like, avoids the influence of the dust, and reads a high quality image. A facsimile apparatus (1) reads a reference color member (23) before reading a document (4) by a reading unit (17), and determines the presence or absence of dust. When it is determined that “dust is present”, one of the reading unit movement avoidance process and the dust presence notification process is performed according to the selection. In the reading unit movement avoiding process, the reading unit 17 is moved by a predetermined amount in the sub-scanning direction by the moving rollers 21 and 22 and the dust determination process is performed again, and it is determined that there is no dust. The reading unit movement avoiding process is repeated until the reading unit 17 is moved. When it is determined that there is no dust, the original 4 is read, and when the determination that there is no dust is not obtained, a dust notification process or a document reading process is performed. In the dust presence notification process, the dust attachment position is calculated from the bit position of the black pixel of the read image information of the reference color member 23, and the dust attachment position is displayed on the operation display unit or recorded and output on recording paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image reading apparatus, and more particularly, to an image reading apparatus which detects the attachment of dust to a contact glass or the like and reads a high quality image while avoiding the influence of the dust. It relates to a reading device.

[0002]

2. Description of the Related Art In image reading apparatuses such as a scanner section of a facsimile apparatus, a general-purpose scanner, and a scanner section of a copying apparatus, a reading section for reading an image of a document while transporting the document is often used.

An image reading apparatus provided with such a reading unit generally projects light from a light source onto a conveyed document, and transmits light reflected by the document by a photoelectric conversion element via a predetermined optical system. The light is incident on a CCD image sensor or the like, and the image of the document is read.

In such an image reading apparatus, if dust, dust, other foreign matter, etc. (hereinafter collectively referred to as dust) adhere to components on the optical path, the dust forms vertical black streaks. Appear in the image and degrade the image quality.

In view of the above, there has been conventionally proposed a reading apparatus in which the surface of a reference member is read by a contact image sensor and used as a reference color when reading an original (Japanese Patent Laid-Open No. 4-2236).
No. 66).

This reading apparatus has a contact type image sensor for reading image information of a document in a contact state, and a rotating roller that rotates in a contact state at a position opposed to the contact type image sensor. A reference color member rotatable coaxially is provided, and the surface of the reference color member is read by the close contact type image sensor to use as a reference color when reading image information of a document.

[0007]

However, in such a conventional image reading apparatus, there is a problem that the influence of dust cannot be completely avoided and the image is deteriorated.

That is, the conventional reading apparatus reads the reference color member before reading the document and uses the reference color member as the reference color when reading the document. Therefore, if dust is attached, the data of the read image of the document is read. There is a problem that the level range is narrowed and the image quality of the read image of the document is deteriorated accordingly.

Therefore, according to the first aspect of the present invention, before the reading means reads the original, the reading means reads the reference color member, and if it is determined that there is dust based on the reading result, the presence of dust is determined. To prompt the operator of the image reading apparatus to remove the dust, read the original in a state where the dust is removed, and completely avoid the influence of dust such as black streaks caused by dust. It is another object of the present invention to provide an image reading apparatus capable of improving the image quality of a read image.

According to a second aspect of the present invention, the reading means reads the reference color member before reading the original by the reading means, and if it is determined that there is dust based on the reading result, the reading means is moved in the sub-scanning direction. Is moved by a predetermined amount and the reading means reads the reference color member again to determine whether or not there is dust. The dust avoidance movement / determination process is repeated until it is determined that there is no dust. It is an object of the present invention to provide an image reading apparatus capable of reading an image and completely avoiding the influence of dust such as generation of black streaks due to dust and improving the image quality of a read image.

According to the third aspect of the present invention, the reading means reads the reference color member before the reading means reads the original, and if it is determined that there is dust based on the reading result, the reading means is moved in the sub-scanning direction. The reference color member is read again by the reading means and the presence / absence of dust is determined by the reading means, and the presence of dust is notified by the notification means. By performing the selection according to the selection result, it is possible to improve the usability of the image reading device, completely avoid the influence of dust such as generation of black streaks due to dust, and improve the image quality of the read image. It is intended to provide a device.

According to a fourth aspect of the present invention, the dust avoidance movement / determination processing for moving the reading means by a predetermined amount in the sub-scanning direction and reading the reference color member again by the reading means to determine the presence or absence of dust is set in advance. The reading means is moved within the predetermined moving range, performed within a predetermined time set in advance, or performed within the preset number of movements of the reading means. When it is determined that dust is present in any dust movement avoiding / determining process, the original is read by the reading unit to prevent the original from being read for a long time, and use of the image reading apparatus. Avoiding the effects of dust such as black streaks caused by dust while improving
It is an object of the present invention to provide an image reading device that can improve the quality of a read image.

According to a fifth aspect of the present invention, when the reading means is moved, the image of the document is read properly by correcting the reading timing of the document by the reading means in accordance with the amount of movement of the reading means. It is an object of the present invention to provide an image reading apparatus that can further improve the quality of an image.

According to a sixth aspect of the present invention, a position where dust adheres is calculated based on the result of reading the reference color member by the reading means, and the position where the dust adheres is displayed and displayed by numerical values, symbols, or recording paper. By recording and outputting the dust, the position where the dust is attached is clarified, the dust can be easily removed by the operator, and the dust is properly and completely removed. It is an object of the present invention to provide an image reading apparatus capable of further improving the image quality of a read image by avoiding the problem more appropriately.

[0015]

According to a first aspect of the present invention, there is provided an image reading apparatus which irradiates a document conveyed on a contact glass with light from a light source at a predetermined reading position, receives reflected light thereof, and receives the reflected light. An image reading device provided with reading means for reading an image of the contact glass, having a width extending over the entire area in the main scanning direction with an interval at which the document can pass between the contact glass and the contact glass on a side opposite to the document. A reference color member that is disposed over a predetermined length in the sub-scanning direction including the reading position and is provided with an optically stable predetermined color;
A dust presence / absence determining unit that determines whether there is dust in the light passage path of the reading unit including the contact glass based on a reading result of the reference color member by the reading unit; and a notification that there is dust. A notifying unit that reads the reference color member before reading the document by the reading unit, and when the dust presence determining unit determines that there is dust based on the reading result, the notifying unit notifies the reading unit of the reference color member. The above object is achieved by providing a control unit for notifying that there is garbage.

According to the above arrangement, before the reading means reads the original, the reading means reads the reference color member, and when it is determined that there is dust based on the result of the reading, the fact that there is dust is notified. It is possible to prompt the operator of the image reading apparatus to remove the dust, to read the original in a state where the dust is removed, and completely avoid the influence of dust such as generation of black stripes due to the dust. The image quality of the read image can be improved.

According to a second aspect of the present invention, there is provided an image reading apparatus which irradiates a document conveyed on a contact glass with light from a light source at a predetermined reading position, receives reflected light thereof, and reads an image of the document. In the image reading device provided with
The contact glass has a width across the entire area in the main scanning direction at a distance that allows the document to pass between the contact glass and the opposite side of the contact glass, and extends over a predetermined length in the sub-scanning direction including the reading position. A reference color member provided and provided with an optically stable predetermined color, and dust on the light passage path of the reading unit including the contact glass based on a reading result of the reference color member by the reading unit. A dust presence / absence determination means for determining whether or not there is dust, and before reading the document by the reading means, cause the reading means to read the reference color member. Is determined, the reading means is moved in the sub-scanning direction by the support means, and the reference color member is read by the reading means. Waste avoidance movement to determine the presence or absence of the /
The above object is attained by providing a control means for repeatedly performing the determination processing until the dust presence determination means determines that there is no dust.

According to the above arrangement, before the reading means reads the original, the reading means reads the reference color member, and if it is determined that there is dust based on the reading result, the reading means is moved in the sub-scanning direction. The dust avoidance movement / determination process of moving the fixed amount and reading the reference color member again by the reading means to determine the presence or absence of dust is repeated until it is determined that there is no dust, so that the original is read at a position where no dust is attached. Therefore, it is possible to completely avoid the influence of dust such as generation of black streaks due to dust and improve the image quality of the read image.

According to a third aspect of the present invention, there is provided an image reading apparatus for irradiating a document conveyed on a contact glass with light from a light source at a predetermined reading position, receiving reflected light thereof, and reading an image of the document. In the image reading device provided with
The contact glass has a width across the entire area in the main scanning direction at a distance that allows the document to pass between the contact glass and the opposite side of the contact glass, and extends over a predetermined length in the sub-scanning direction including the reading position. A reference color member provided and provided with an optically stable predetermined color, and dust on the light passage path of the reading unit including the contact glass based on a reading result of the reference color member by the reading unit. A dust presence / absence determining means for determining whether there is dust, a notifying means for notifying that dust is present, and moving the reading means in the sub-scanning direction by the support means to read the reference color member by the reading means. Selecting means for selecting a dust avoidance moving / determining process for determining presence / absence of dust by the dust presence determining unit and a dust presence notification process by the notifying unit; Before reading the document by the reading means, the reading means reads the reference color member. If the dust presence determination means determines that there is dust based on the result of the reading, the reading means reads the reference color member. The above object is achieved by providing a control means for performing either the avoidance movement / discrimination processing or the dust presence notification processing.

According to the above arrangement, before the reading means reads the original, the reading means reads the reference color member. If it is determined that there is dust based on the reading result, the reading means is moved in the sub-scanning direction. The operator selects one of the dust avoidance movement / discrimination process of moving the fixed amount and reading the reference color member again by the reading unit to determine the presence or absence of dust, and the dust presence notification process of notifying the presence of dust by the notification unit. Therefore, the usability of the image reading apparatus can be improved, and the influence of dust such as black streaks caused by dust can be completely avoided, and the image quality of the read image can be improved.

In each of the above cases, for example, as set forth in claim 4, the control means is configured to perform the dust movement avoiding / determining process for moving the reading means within a predetermined moving range, The dust avoidance movement / discrimination processing within a predetermined time, or the dust movement avoidance at a preset number of movements of the reading unit.
The dust avoidance movement / discrimination processing is performed within a range of at least one of the conditions, and the dust presence / absence determination unit is configured to perform the dust movement avoidance / discrimination processing within a range of the condition. If it is determined that there is dust, the document may be read by the reading unit.

According to the above configuration, the dust avoidance movement / determination processing for moving the reading means in the sub-scanning direction by a predetermined amount and reading the reference color member again to determine the presence or absence of dust by the reading means is performed by a predetermined movement. Whether to move the reading means within the range, perform it within a predetermined time set in advance,
Alternatively, it is performed within the range of at least one of the conditions of performing within the preset number of movements of the reading unit, and when it is determined that there is dust in any of the dust movement avoiding / determining processes, the document is read by the reading unit. Scanning prevents the document from being read for a long time, improving the usability of the image reading device and avoiding the influence of dust such as black streaks caused by dust. As a result, the image quality of the read image can be improved.

Further, for example, as described in claim 5, when the control means moves the reading means,
The reading timing of the document by the reading unit may be corrected in accordance with the movement amount of the reading unit.

According to the above arrangement, when the reading means is moved, the reading timing of the document by the reading means is corrected in accordance with the amount of movement of the reading means, so that the image of the document can be read properly. Image quality can be further improved.

Further, for example, as set forth in claim 6, the notifying means is a display means or a recording output means, and the control means is configured to execute the control based on a reading result of the reference color member by the reading means. The position where the dust is attached may be calculated, and the position where the dust is attached may be displayed and output by the display unit using numerical values, symbols, or the like, or may be recorded and output by the recording output unit.

According to the above arrangement, the position at which dust is attached is calculated based on the result of reading the reference color member by the reading means.
Since the position where the dust is attached is displayed and displayed by a numerical value, a symbol, or the like, or recorded and output on a recording sheet, the position where the dust is attached can be clarified, and the dust can be easily removed by the operator. . Therefore, dust can be properly and completely removed, and the influence of dust such as generation of black streaks due to dust can be more appropriately avoided, and the image quality of the read image can be further improved.

[0027]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 to 10 show an embodiment of the image reading apparatus of the present invention. FIG. 1 is a perspective view of a facsimile apparatus 1 to which the embodiment of the image reading apparatus of the present invention is applied. FIG.

In FIG. 1, a facsimile machine 1 includes an ADF for separating and transporting a document placing table 3 on a main body case 2 and a document 4 (see FIG. 2) placed on the document placing table 3 one by one. (Automatic document feeder) 5 and
An operation display unit 6 is provided on a front side surface of the main body case 2. The operation display unit 6 includes various operation keys 6a such as a numeric keypad and a start key, and also includes a display (notification unit, display unit) 6b, for example, a liquid crystal display. From the operation keys 6a, various commands such as a transmission operation are provided. The input, the contents of the command input from the operation keys 6a and various information notified from the facsimile machine 1 to the operator are displayed on the display 6b. In the operation display section 6, in particular, in the dust presence determination / avoidance processing described later,
An avoidance method setting key for instructing a processing method when it is determined that “dust is present” and various setting keys for setting the number of times of dust avoidance movement / determination processing are provided. A document tray 7 for discharging and depositing the document 4 whose image has been read is mounted on the main body case 2 below the document mounting table 3, and the facsimile machine 1 A recording paper tray 8 for discharging and depositing recording paper on which an image has been recorded is attached.

As shown in FIG. 2, the ADF 5 has a pickup roller 12 for separating the originals 4 set on the original placing table 3 one by one and sending out the originals 4 to the original conveying path 11.
The original 4 sent out to the original feed path 11 is fed by a feed roller pair 13 and a main feed roller pair 14.
The sheet is conveyed to the reading position P by the conveying roller pair 15.

As shown in FIG. 3, a contact glass 16 is provided at the reading position P, and a reading section 17 is provided in the main body case 2 below the contact glass 16.

A reading section (reading means) 17 includes a light source 18 for irradiating the original 4 with light through the contact glass 16, and a photoelectric conversion element for receiving reflected light from the original 4 and performing photoelectric conversion to read an image of the original 4. 19 and an optical system 20 for introducing the reflected light from the document 4 into the photoelectric conversion element 19. The photoelectric conversion element 19 has a predetermined number of pixels in the main scanning direction, for example,
4,112 pixels (bits) are arranged. Although not shown in detail, the reading unit 17 includes a pair of moving rollers 21 for moving the reading unit 17 itself by a predetermined amount in the sub-scanning direction along the surface of the main body case 2 on which the contact glass 16 is attached. , 22, and the facsimile apparatus 1 moves the reading unit 17 in the sub-scanning direction by rotating the moving rollers 21 and 22.

A reference color member 23 is disposed on the opposite side of the reading portion 17 of the contact glass 16, and the reference color member 23 has an optically stable color, for example, at least a surface on the contact glass 16 side. , White. The reference color member 23 is provided at least over the entire reading width in the main scanning direction, and is provided so as to extend over a predetermined range in the sub-scanning direction around the reading position P.

As shown in FIG. 3, a document detection sensor 24 is disposed in front of the reading position P of the conveyance path 11, and the document detection sensor 24 has been conveyed on the conveyance path 11. The leading edge of the document 4 is detected. The image of the document 4 conveyed to the reading position P through the conveyance path 11 is read by the reading unit 17, and the document 4 whose image has been read is discharged onto the document tray 7 by the discharge roller pair 25.

As shown in FIG. 4, a scale 26 provided with a predetermined scale from a position corresponding to the position of the first bit of the reading range of the reading unit 17 is provided on the conveying path 11 near the contact glass 16. Is attached,
The transport path 11 of the portion where the scale 26 is attached
The upper case 27 is rotatably attached to the main body case 2 and can be opened and closed. In FIG. 4, the scale 26 has a scale of “0” indicating the 0th bit (base point), “128.5” (mm) indicating the center point, and “257” (mm) indicating the right end. Have been.

The facsimile apparatus 1 has a circuit configuration as shown in FIG. That is, the facsimile apparatus 1 includes the reading unit 17, the encoding / decoding unit 31, the system memory 32, the operation display unit 6, the recording unit 33, the system control unit 34, the image information memory 35, the communication control unit 36, and the modem 37. The above components are connected by a bus 38.

The encoding / decoding unit 31 is for improving the efficiency of storing image information in the image information memory 35 and shortening the transmission time, and encodes image information according to a predetermined encoding method. , And decodes the encoded image information.

The system memory 32 stores a basic program as the facsimile machine 1, a dust presence / absence determination / avoidance processing program described later, and the like. In addition, the system memory 32 is used as a temporary memory or the like when performing image processing such as encoding processing and decoding processing on a received image or a transmitted image.

As the recording section (storage means, notifying means) 33, for example, a thermal recording apparatus using a thermal element or an electrophotographic recording apparatus is used. In addition to recording and outputting the image and the like read on the recording paper, a dust position described later is recorded and output.

The system control unit (control means, dust presence / absence determination means) 34 controls each part of the facsimile machine 1 in accordance with a program in the system memory 32 to execute a sequence as the facsimile machine 1 and to detect dust presence / absence described later. Execute determination / avoidance processing.

The image information memory 35 has a RAM (Random Acc.)
ess memory) and a readable / writable memory such as a hard disk. The coded image data of the document 4 mainly read by the reading unit 17 and coded by the coding / decoding unit 31 is stored and received. The encoded image data is stored.

A modem 37 is connected to the communication control unit 36, and the communication control unit 36 exchanges a facsimile control signal with a partner facsimile machine and executes a facsimile communication procedure.

The modem 37 operates under the control of the system control unit 34 to perform modulation of a transmission signal and demodulation of a reception signal.

Next, the operation of the present embodiment will be described. Before reading the document 4, the facsimile apparatus 1
It is characterized in that the reference color member 23 is read by 7 and dust avoidance movement / discrimination processing such as movement of the reading unit 17 in the sub-scanning direction and indication that dust is attached is performed.

That is, the facsimile machine 1
When reading the original, a plurality of originals 4 set on the original platen 3 are sent out one by one to a transport path 11 by a pickup roller 12, and the originals 4 sent out by the pickup roller 12 are sent out. The sheet is conveyed along the conveyance path 11 by the pair 14 and the conveyance roller pair 15 to the reading position P of the contact glass 16.

At this time, when the document detection sensor 24 detects the leading end of the document 4 being conveyed to the reading position P, the system control unit 34 sets the document 4 in a reading standby state.

On the other hand, the system control unit 34 causes the moving rollers 21 and 22 to set the reading unit 17 at the reading position P,
The reading unit 17 reads the reference color member 23 at the reading position P to determine the presence or absence of dust.

That is, when the reading section 17 reads one line of the reference color member 23 at the reading position P, the reading section 17 outputs the read image information to the system control section 34, and outputs the read image information to the system control section 34.
As shown in FIGS. 6 and 7, the image information of the reference color member 23 read by the reading unit 17 is compared with a judgment level, which is a predetermined reference value, for each bit, and the image of the color reference member 23 is compared. The information is converted to a black and white binary level depending on whether the information is larger or smaller than the judgment level. Then, the system control unit 34
As shown in FIG. 6, when all the image information of the reference color member 23 is converted to white larger than the determination level, it is determined that there is no dust, and as shown in FIG. If there is a bit, it is determined that there is dust.

When the system control unit 34 determines that “dust is present”, the system control unit 34 performs one of the following reading unit movement avoidance processing and dust presence notification processing in accordance with the setting state of the operation display unit 6 using the avoidance method setting key. Perform processing.

First, the reading unit movement avoiding process will be described. When the system control unit 34 determines that "dust is present" in the dust presence determination process, the system control unit 34 drives the moving rollers 21 and 22 of the reading unit 17 to read. The unit 17 is moved from the reading position P by a predetermined amount in the sub-scanning direction, and the above-described dust presence / absence determination processing is performed again. "Dust present" in this dust presence determination process
Is determined, the system control unit 34 further drives the moving rollers 21 and 22 of the reading unit 17, further moves the reading unit 17 by a predetermined amount in the sub-scanning direction, and performs the dust presence / absence determination process again. The system control unit 34 determines that the moving process and the dust presence determination process of the reading unit 17 are “no dust” in the dust presence determination process, or moves the reading unit 17 between the movable ranges of the reading unit 17. Repeat until As shown in FIG. 3, the movable range of the reading unit 17 is a distance from the document detection sensor 24 to the reading position P, which is L.
Assuming that the distance is 1, the distance is between a position L2 which is closer to the document detection sensor 24 by a predetermined distance than the distance L1 and a position L3 which is farther by a predetermined distance than the distance L1 (L3-L2). The system control unit 34 moves the reading unit 17 by a predetermined amount in the sub-scanning direction within the movable range. The amount by which the system control unit 34 moves the reading unit 17 in one movement process is appropriately 0.5 to 1.0 mm in consideration of the size of ordinary dust.

When the system control unit 34 performs the moving process of the reading unit 17 and the dust presence / absence determination process and determines that there is no dust, the system control unit 34 transports the document 4 onto the contact glass 16 and transports the contact glass 4 Then, the image of the document 4 is read by the reading unit 17.

If the system control unit 34 does not determine that there is no dust even after performing the moving process of the reading unit 17 and the dust presence determination process, the operation display unit 6
Depending on the key setting, one or both of the dust notification process and the document reading process described below are performed.

In the reading unit movement avoidance processing, the determination result of “no dust” or the movable range (L
3-L2) until the reading unit 17 is moved.
Is performed, and the number of repetitions and the time limit of the movement of the reading unit 17 and the presence / absence determination processing can be set by key operation of the operation display unit 6. The moving process of the reading unit 17 and the dust presence / absence determination process may be terminated by one or both of the time limits, and either or both of the dust presence notification process and the document reading process may be performed.

Next, the dust presence notification process will be described. If the system control unit 34 determines that “dust is present” in the dust presence determination process, the dust is
Display 6b on the operation display unit 6
Is displayed on the screen and a display for designating a place where dust is attached is performed to notify the presence of dust.

That is, when the system control unit 34 determines that there is “dust” in the dust presence determination process, the system control unit 34 calculates a dust attachment position from the bit position determined as the black pixel, and determines the calculated adhesion position as: For example, a notification such as "dust is present in a 121 mm portion of the contact glass" is displayed on the display 6b to notify the user. For example, the system control unit 34 sets the black pixels as shown in FIG.
When a black pixel is detected as a binarized pixel of 30 to 1935 bits, 1930/16 = 120.6 is calculated, the calculation result is rounded, and it is determined that dust is present at a position of 121 mm. Then, the system control unit 34 displays the calculated dust attachment position on the display 6b of the operation display unit 6 and notifies the same as described above.

In the dust presence notification process, not only the dust position is displayed on the display 6b, but also the dust position may be recorded on a recording sheet and notified.

That is, the system control unit 34 drives the recording unit 33 to convert the information corresponding to the calculated dust position into character data, and records, for example, "There is dust in the 121 mm portion." Record output on paper.

When the operator of the facsimile apparatus 1 is notified of the dust attachment position by numerical values in the dust notification processing, as shown in FIG. By recognizing the scale and wiping the position where the dust adheres to the contact glass 16 with a cloth or the like, the dust can be accurately removed.

In the dust presence notification process, when the dust position is recorded on the recording paper and notified, not only the dust position is recorded by numerical values and characters, but also the dust adhesion position is represented by the scale of the recording paper. It may be recorded and output by using a symbol or the like.

That is, the system control unit 34 binarizes the image information of the reference color member 23 read in the dust presence / absence judgment processing, and the recording unit 33 uses the binarized image information for several lines as it is. As shown in FIGS. 8 to 10, the recording is performed on the recording paper 40, and the dust position G is recorded on the recording paper 40.

For example, when the recording paper 40 corresponds to the reading width of the reading unit 17, as shown in FIG.
7, the image information read from the reference color member 23 is binarized as it is, and the same data for several lines is recorded on the recording paper 40 by the recording unit 33, so that the dust position G corresponding to the dust adhesion position is recorded on the recording paper 40. Then, the operator of the facsimile apparatus 1 records the recording paper 40 on which the dust position G is recorded at the position "0" of the scale 26 by opening the upper case 27 as shown in FIG. Paper 40
The dust position on the contact glass 16 can be recognized by the dust position G by setting the left end of the contact glass together, and the dust can be accurately removed by wiping the dust position of the contact glass 16 with a cloth or the like. Can be.

When the width of the recording paper 40 is narrower than the reading width of the reading unit 17, the center position of the reading unit 17, that is, the center of the contact glass 16 is determined according to the dust position determined in the dust presence determination processing. 9 and 10, the recording position of the dust position G is adjusted so that the width of the recording paper 40 is smaller than the reading width of the reading unit 17 as shown in FIGS. In such a case, the dust position G can be appropriately recorded and displayed.

That is, when the dust adhesion position is on the left side (0-bit side) of the center position of the reading unit 17, the system control unit 34 determines whether the dust adhesion has occurred to the black pixel photoelectric conversion element 19 as described above. Based on the position, the dust position G is recorded and output on the recording paper 40 as shown in FIG. 9, and when the dust attachment position is on the right side (4112 bit side) of the center position of the reading unit 17, the system control unit Numeral 34 calculates the dust adhesion position on the basis of 4112 bits, and records and outputs the dust position G on the recording paper 40 as shown in FIG.

Then, when the dust position G is recorded as shown in FIG. 9, the operator of the facsimile apparatus 1 adjusts the left end of the recording paper 40 to the "0" position of the scale 26, thereby to set the dust position. G is contact glass 16
When the dust position G is recorded as shown in FIG.
By aligning the right end of the recording paper 40 with the position “257” of the scale 26, the dust adhesion position on the contact glass 16 can be recognized from the dust position G of the recording paper 40.

Next, when the dust avoidance process is performed by moving the reading unit 17, the reading start timing and the reading end timing of the document 4 are determined by moving the reading unit 17 in order to read the document 4 appropriately. A description will be given of a document reading process that adjusts according to the amount.

Now, the above-described dust presence / absence determination processing and reading unit 1
It is assumed that it is determined that the reading process is performed while avoiding the dust position by moving the reading unit 17 by, for example, 2 mm to the downstream side in the transport direction of the document 4 by the moving process of FIG. In this state, when the original 4 is read at the normal reading timing,
Since the reading unit 17 is moved to the downstream side in the transport direction of the document 4, the reading start position of the document 4 by the reading unit 17 is shifted from the case where the reading unit 17 is at the reading position P, and the reading unit 17 is moved to the reading position. The reading range of the document 4 is different between the case where the document is located at P and the case where the document 4 is moved by the moving process.
That is, normally, when the document detection sensor 24 detects the leading edge of the document 4, the system control unit 34 detects that the leading edge of the document 4 has been transported from the reading position P by several millimeters (for example, 1 mm). Of the document 4 by the reading unit 17 at the timing when the document 4 is read to a few millimeters (for example, 1 mm) before the rear end of the document 4, the leading and trailing edges of the document 4 are read, and Although it is prevented from being recognized as black due to the influence, as described above, the reading unit 17 moves the document 4 by 2 mm.
When the reading unit 17 is moved to the downstream side in the conveyance direction, the reading start position and the reading end position of the document 4 by the reading unit 17 are shifted by an amount (for example, 2 mm) by which the reading unit 17 is moved. Positions deviated from the leading and trailing edges of the document 4 are the reading start position and the reading end position,
May be recognized as a black pixel due to the influence of the shadows at the front and rear ends.

Therefore, the system control unit 34 sets the reading unit 1
7 is moved according to the moving amount of the reading unit 17,
Even when the reading timing of the document 4 by the reading unit 17 is shifted and the reading unit 17 is moved, control is performed such that the same reading range of the document 4 as when the reading unit 17 is at the reading position P is read.

That is, as described above, the reading unit 1
Assuming that the document 7 has been moved by a predetermined amount, for example, 2 mm, to the downstream side in the document conveying direction, the system control unit 34 conveys the leading end of the document 4 from the normal reading position P by the moving amount of the reading unit 17, Further, the reading unit 17 starts reading the original 4 at the time when the original 4 is conveyed by a normal cut amount for preventing the influence of the shadow of the edge of the original 4, and starts the normal operation from the rear end of the original 4. The reading by the reading unit 17 is terminated by setting the time when the cut amount for preventing the influence of the shadow of the trailing edge of the document 4 is left as the reading end timing.

Therefore, an appropriate range of the document 4 can be read without being affected by the coal selection and the trailing edge of the document 4, and the reading quality can be improved.

Although the invention made by the inventor has been specifically described based on the preferred embodiments, the invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

For example, in the above-described embodiment, the determination of presence / absence of dust is made by setting the reference color member 23 to a predetermined reference value.
The result of the binarization is determined based on whether the pixel is a white pixel or a black pixel.However, the determination of the presence or absence of dust is not limited to the above-described method. Any method may be used.

[0072]

According to the image reading apparatus of the present invention, the reference color member is read by the reading means before the document is read by the reading means, and it is determined that there is dust based on the reading result. To notify the operator of the image reading apparatus that the dust is removed, the original can be read in a state where the dust has been removed, and the occurrence of black streaks due to the dust, etc. It is possible to completely avoid the influence of dust and improve the image quality of the read image.

According to the image reading apparatus of the second aspect, before the reading means reads the original, the reading means reads the reference color member, and if it is determined that there is dust based on the reading result, The dust avoidance movement / determination process of moving the reading means in the sub-scanning direction by a predetermined amount and reading the reference color member again to determine the presence or absence of dust is repeated until it is determined that there is no dust. The original can be read at a position where the original is not located, and the influence of dust such as generation of black streaks due to dust can be completely avoided, and the image quality of the read image can be improved.

According to the image reading apparatus of the present invention, the reading means reads the reference color member before the reading of the document by the reading means, and when it is determined that there is dust based on the reading result, A dust avoidance movement / discrimination process for moving the reading unit in the sub-scanning direction by a predetermined amount and reading the reference color member again to determine the presence or absence of dust, and a dust presence notification process for notifying that dust is present by the notifying unit. Since either of them is performed according to the selection result of the operator, the usability of the image reading apparatus can be improved, and the influence of dust such as generation of black stripes due to dust can be completely avoided, and the image quality of the read image can be improved. Can be improved.

According to the image reading apparatus of the present invention, the reading means is moved in the sub-scanning direction by a predetermined amount, and the reading means reads the reference color member again to determine the presence / absence of dust. The processing is at least one of moving the reading means within a predetermined moving range, performing the processing within a predetermined time, or performing the processing within a predetermined number of movements of the reading means. Perform within the range of conditions to avoid any trash movement /
If it is determined that there is dust in the determination process, the document is read by the reading unit. Therefore, it is possible to prevent the document from being not read for a long time, and to improve the usability of the image reading apparatus. In addition, it is possible to improve the quality of the read image by avoiding the influence of dust such as generation of black streaks due to dust.

According to the image reading apparatus of the present invention, when the reading means is moved, the reading timing of the document by the reading means is corrected in accordance with the amount of movement of the reading means. The image can be read appropriately, and the quality of the read image can be further improved.

According to the image reading apparatus of the present invention, the adhesion position of the dust is calculated based on the result of reading the reference color member by the reading means, and the adhesion position of the dust is represented by a numerical value.
Since the display output is performed using a symbol or the like or the recording output is performed on the recording paper, the position where the dust adheres can be clarified, and the dust can be easily removed by the operator. Therefore, dust can be properly and completely removed, and the influence of dust such as generation of black streaks due to dust can be more appropriately avoided, and the image quality of the read image can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a facsimile apparatus to which an embodiment of an image reading apparatus according to the present invention is applied.

FIG. 2 is an enlarged front cross-sectional view of an ADF and a reading unit in FIG. 1;

FIG. 3 is an enlarged front sectional view of a contact glass part of FIG. 2;

4 is a perspective view showing a state where an upper case of an ADF and a reading unit of FIG. 1 is opened;

FIG. 5 is a circuit block diagram of the facsimile apparatus of FIG. 1;

FIG. 6 is a diagram showing image information and a determination level obtained by reading a reference color member when there is no dust.

FIG. 7 is a diagram illustrating image information and a determination level obtained by reading a reference color member when dust is present.

FIG. 8 is a top view of a dust adhesion notification in which a dust position is recorded and output on recording paper having the same width as a reading range.

FIG. 9 is a top view of a dust adhesion notification in which a dust position is recorded and output on recording paper having a width narrower than the read range when dust adheres to the left side of the center of the read range.

FIG. 10 is a top view of a dust adhesion notification in which a dust position is recorded and output on recording paper having a width smaller than the reading range when dust is attached to the right side of the center of the reading range.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 facsimile apparatus 2 main body case 3 document placing table 4 document 5 ADF 6 operation display section 6a operation keys 6b display 7 document tray 8 recording paper tray 11 document transport path 12 pickup roller 13 sending roller pair 14 main transport roller pair 15 transport roller pair 16 Contact Glass 17 Reading Unit 18 Light Source 19 Photoelectric Conversion Element 20 Optical System 21, 22 Moving Roller 23 Reference Color Member 24 Document Detection Sensor 25 Discharge Roller Pair 26 Scale 27 Upper Case 31 Encoding / Decoding Unit 32 System Memory 33 Recording Unit 34 System control unit 35 Image information memory 36 Communication control unit 37 Modem 38 Bus P Reading position 40 Recording paper G Dust position

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 11, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 5

FIG. 4

FIG. 6

FIG. 7

FIG. 8

FIG. 9

FIG. 10

Claims (6)

[Claims]
1. An image reading apparatus, comprising: reading means for irradiating a document conveyed on a contact glass with light from a light source at a predetermined reading position and receiving reflected light thereof to read an image of the document. On the opposite side of the glass from the document, a width is provided over the entire area in the main scanning direction with a space that allows the document to pass between the contact glass and a predetermined length in the sub-scanning direction including the reading position. There is dust in the light passing path of the reading unit including the contact glass based on the reference color member provided with the predetermined color that is optically stable and the reading unit reads the reference color member. Dust presence / absence determination means for determining whether or not there is dust; notification means for notifying that there is dust; and reading the reference color member by the reading means before reading the document by the reading means. So, if the reading result the dust presence determination means based on the determined that there is dust, the image reading apparatus characterized by and a control means for notifying that dust is present by said notifying means.
2. An image reading apparatus comprising: reading means for irradiating light from a light source to a document conveyed on a contact glass at a predetermined reading position and receiving reflected light thereof to read an image of the document. On the opposite side of the glass from the document, a width is provided over the entire area in the main scanning direction with a space that allows the document to pass between the contact glass and a predetermined length in the sub-scanning direction including the reading position. There is dust in the light passing path of the reading unit including the contact glass based on the reference color member provided with the predetermined color that is optically stable and the reading unit reads the reference color member. Dust reading means for determining whether or not the reference color member is to be read by the reading means before reading the document by the reading means; When the presence / absence determination unit determines that there is dust, the support unit moves the reading unit in the sub-scanning direction, the reading unit reads the reference color member, and the dust presence / absence determination unit determines presence / absence of dust. A control unit for repeatedly performing the movement / discrimination process until the dust presence / absence determination unit determines that there is no dust.
3. An image reading apparatus, comprising: reading means for irradiating a document conveyed on a contact glass with light from a light source at a predetermined reading position and receiving reflected light thereof to read an image of the document. On the opposite side of the glass from the document, a width is provided over the entire area in the main scanning direction with a space that allows the document to pass between the contact glass and a predetermined length in the sub-scanning direction including the reading position. There is dust in the light passing path of the reading unit including the contact glass based on the reference color member provided with the predetermined color that is optically stable and the reading unit reads the reference color member. A dust presence / absence determining means for determining whether or not there is dust; a notifying means for notifying that there is dust; and the support means moving the reading means in the sub-scanning direction, and Selecting means for selecting a dust avoidance moving / determining process for reading a reference color member and determining presence / absence of dust by the dust presence determining means and dust presence notification processing by the notifying means; and before reading the document by the reading means Causing the reading means to read the reference color member,
When the dust presence / absence determination unit determines that there is dust based on the reading result, a control unit that performs one of the dust avoidance movement / determination process and the dust presence notification process according to the selection result of the selection unit. An image reading apparatus comprising:
4. The method according to claim 1, wherein the control unit moves the reading unit within a predetermined moving range.
And / or discrimination processing, the dust avoidance movement / discrimination processing within a predetermined time, or the dust movement avoidance / discrimination processing based on a preset number of movements of the reading unit. The dust avoidance moving / determining process is performed within a range of a condition, and in any of the dust moving avoiding / determining processes within the range of the condition, when the dust presence / absence determining unit determines that there is dust, the reading unit performs the dust avoiding / moving process. The image reading apparatus according to claim 2, wherein reading of a document is performed.
5. The apparatus according to claim 2, wherein said control means corrects a reading timing of said document by said reading means in accordance with a movement amount of said reading means when said reading means is moved. Item 5. The image reading device according to any one of Items 4.
6. The notifying means is a display means or a recording output means, and the control means calculates an adhesion position of the dust based on a reading result of the reference color member by the reading means, and calculates the dust attaching position. 6. The image reading device according to claim 1, wherein the attachment position of the image is displayed as a numerical value, a symbol, or the like by the display unit, or is recorded and output by the recording output unit. apparatus.
JP8229301A 1996-08-12 1996-08-12 Image reader Pending JPH1056542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8229301A JPH1056542A (en) 1996-08-12 1996-08-12 Image reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8229301A JPH1056542A (en) 1996-08-12 1996-08-12 Image reader

Publications (1)

Publication Number Publication Date
JPH1056542A true JPH1056542A (en) 1998-02-24

Family

ID=16889999

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8229301A Pending JPH1056542A (en) 1996-08-12 1996-08-12 Image reader

Country Status (1)

Country Link
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