JPH1169078A - Original carrying sheet, image reader and image reading method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the original carrying sheet, the image reader and the image reading method by which an original such as a photograph having a margin therearound is easily positioned without hiding an index. SOLUTION: A carrier sheet 101 is made up of, e.g. a rectangular transparent sheet 102 and a white sheet 103 of the same shape. The transparent sheet 102 and the white sheet 103 are formed of a thermoplastic material with heat resistance and mechanical strength and so on like a polyethylene terephthalate PET. One ends of the transparent sheet 102 and the white sheet 103 in the lengthwise direction are adhered to be an adhered part 104, and a couple of indices 105, 105 that depict a read range of an original and an original placing position or the like are formed as punched holes in the vicinity of both ends of the adhered part 104 in the lengthwise direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original conveying sheet, an image reading apparatus, and an image reading method, and more particularly, to a method of using a sheet through type scanner to bond or weld one end of two sheets. It is suitable for application to a carrier sheet of a one-sided transparent sheet that allows a document to be read with the document interposed therebetween, and application to a facsimile, a printer, or the like having means for transporting the document to be read and means for reading the transported document. The present invention relates to a document conveying sheet, an image reading device, and an image reading method.

[0002]

2. Description of the Related Art Conventionally, in a reading apparatus equipped with a sheet-through type scanner such as a facsimile, a one-side transparent sheet carrier sheet for performing reading with a document sandwiched therebetween by bonding or welding one end of two sheets is used. It is commonly used. In a conventional carrier sheet of this type, indices indicating the reading range of the document, the position of the document, and the like are printed on a white sheet located below the document.

On the other hand, as an image reading apparatus, a copying machine, a facsimile and the like have been generally used. In recent years, there is an image reading apparatus in which reading means is added to a recording apparatus such as a printer. For example, a printer equipped with a serial-type reading device has a configuration in which the recording device and the reading device are replaced on a carriage holding the recording device, or a configuration in which the reading device is added to the printer body.

Here, a description will be given of an example in which a scanner head cartridge as reading means is attached to an ink jet printer which performs recording by discharging ink. FIG. 9 is a perspective view showing the appearance of the ink head cartridge 1 as the recording means, and FIG. 10 is a perspective view showing the appearance of the color scanner head cartridge 2 as the reading means. The color scanner head cartridge 2 functions as a reading unit by replacing it with the ink head cartridge 1 mounted on the carriage of the ink jet printer. Therefore, the shape of the color scanner head cartridge 2 is set so as not to hinder the mounting on the carriage. It has a shape very similar to the ink head cartridge 1.

Next, the structure of an ink jet printer equipped with a serial type reading means and the operation when the ink jet printer functions as a recording device will be described with reference to, for example, a block diagram shown in FIG. The ink jet printer uses the ink head cartridge 1
, A color scanner head cartridge 2, an inkjet printer main body 3, and a host computer (PC:
A personal computer) 4.

[0006] The ink head cartridge 1 includes a BJ (bubble jet) head 1a and a head driver 1b. The color scanner head cartridge 2 is
Sensor 2a, Red-LED (red light emitting diode), Green-LED (green light emitting diode), B
Light source 2 having lue-LED (blue light emitting diode)
b and image processing LSI (Large Scale Integration)
2c and an S-RAM (Static RAM) 2d.

The ink jet printer main body 3 has a carriage head terminal 3a, a controller (GA) 3b having a switching block, and an interface (I / F, bidirectional Centronics interface: bidirectional 8-bit parallel interface for printer). 3c and CPU 3d
, A motor driver 3e, and a CR (Carriage Return)
n) Detection sensor 3f, CR motor 3g, paper detection sensor 3h, motor driver 3i, LF (Line Fee)
d) A motor 3j, a RAM and a ROM 3k are provided. The configuration and function of each unit will be described together with the operation.

The recording data such as characters or images is transferred from the host computer 4 via the interface (I / F) 3c under the control of the host computer 4 and the CPU 3d, and the controller 3b receives the recording data. The data is processed as data to be recorded on recording paper by the ink head cartridge 1. Further, the controller 3b
Under the control of the CPU 3d, recording data is sent to the ink head cartridge 1 via the carriage head terminal 3a, and characters or images are recorded on recording paper.

The operation of the mechanism at this time will be described with reference to FIG. FIG. 11 is a perspective view showing the appearance of the printing mechanism of the ink jet printer. The printing mechanism includes a CR motor 3g, a carriage 5, a platen 6, a guide shaft 7, an LF roller 15g, a white reference piece 20, and the like.
The carriage 5 is a mechanism for mounting the ink head cartridge 1 or the color scanner head cartridge 2, and is movably driven along the guide shaft 7. The platen 6 includes a CPU 3d, a controller 3b,
The recording sheet is supported by a driving mechanism controlled by the motor driver 3i to form a recording table.

At the time of recording, an ink head cartridge 1 as a recording means is mounted, and at the time of reading an image, a color scanner head cartridge 2 as a reading means is mounted on a carriage 5, and these are recorded on a recording paper or a document surface for reading an image. Transport along. The movement of the carriage 5 is controlled by the CPU 3
d, by driving the CR motor 3g controlled by the controller 3b and the motor driver 3e. Also,
The paper detection sensor 3h detects whether a recording paper or a document for image reading is set on the platen 6. Further, the CR detection sensor 3f detects whether or not the carriage 5 is at the start position. Recording is performed using the above main mechanisms.

Next, a description will be given of a case where the ink jet printer functions as an image reading apparatus with reference to FIG.
FIG. 12 is a sectional view showing a schematic configuration inside the color scanner head cartridge 2. Inside the color scanner head cartridge 2, a sensor 2a, a light source 2b, a lens 8, a condenser lens 10, an LED substrate 11, and a mirror 12 are arranged. In the figure, reference numeral 9 denotes a document to be read.

When the color printer head cartridge 2 is attached to the carriage 5 and the ink jet printer 3 functions as an image reading apparatus, first, the color correction head cartridge 2 captures white correction data which is a reference for reading image data. It is necessary to transfer data to the host computer 4 for storage. As a white correction method at this time, there is usually a method of providing a white reference piece 20 beside the platen 6 or feeding a white reference sheet, but in this case, a white reference sheet is used. The explanation will be given in the following.

The white reference sheet is fed to the printing mechanism of the ink jet printer in the same manner as the paper feeding method when the ink jet printer functions as a recording device, and is provided in the color scanner head cartridge 2 as reading means. The light source 2b irradiates the surface of the white reference sheet obliquely, and the reflected image is detected as white correction data by the sensor 2a having photoelectric conversion characteristics via the mirror 12 and the lens 8.

In the block diagram of FIG. 5, a signal detected by the sensor 2a is converted into an analog / digital converter (not shown, hereinafter abbreviated as A / D) in the image processing LSI 2c.
The signal is amplified to the optimum level to be handled in step (1) and input to the A / D. The digital data converted by the A / D is subjected to shading correction, binarization correction, and other image processing by an image processing LSI 2c, and then to the inkjet printer main body 3 via a carriage head terminal 3a of the inkjet printer. Transferred to This transfer is sent to the host computer 4 through a path reverse to the flow of the recording data at the time of recording. Thus, the white correction data is transferred to the host computer 4 and stored.

That is, image data is sent from the image processing LSI 2c to the host computer 4 via the carriage head terminal 3a, the controller 3b, and the interface 3c. At this time, the controller 3c transmits the image data received from the image processing LSI 2c to the interface 3
The data is transferred while being controlled by the CPU 3d in a form easy to send by c or a form easy to handle by the host computer 4. The white correction data stored in the host computer 4 is transferred to the color scanner head cartridge 2 along the reverse path when reading an image, and is used as reference data when processing image data.

That is, the digital image data input to the image processing LSI 2c is used for shading correction, based on the white correction data transferred from the host computer 4, and
Correction such as binarization and other image processing are performed. The flow of the subsequent image data transfer is the same as the flow of the white correction data. When the white correction is completed, the original to be actually read is inserted into the protection sheet 13 shown in FIG. 13 and is conveyed to the printing / reading mechanism of the inkjet printer.

FIGS. 13A and 13B are views showing the structure of a conventional protective sheet 13, wherein FIG. 13A is a side view and FIG. 13B is a plan view.
The protective sheet 13 generally has a structure in which a transparent sheet 14 on the front side (reading side) and a white polyester sheet 15 on the back side are bonded together, and protects a document to be read from ink stains and various rollers during conveyance. Further, it is used to enable reading of photographs or business card size documents that can be transported by an ink jet printer. Further, in an apparatus that performs reading while transporting a document, the protection sheet 13 is used.
The reading range is specified by providing an index 16 of the insertion position according to the size of the document to be read on the white polyester sheet 15 on the back surface side in FIG. A broken line in FIG. 13B indicates an index.

The operation of the mechanism for reading a document conveyed to the reading start position of the ink-jet printer is different from the operation at the time of recording, in that the color scanner head cartridge 2 moves three times on the same document surface. That is,
Reading by the color scanner head cartridge 2 employs a method in which a light source (LED) 2b of three colors R, G, and B provided inside the cartridge is sequentially turned on, and a color image is formed by reading the same original surface in each color.

More specifically, with the original for image reading set on the platen 6, the carriage 5 mounts the color scanner head cartridge 2 and lights one of the three LEDs, for example, Red. The image is read along the surface of the read original by one line, and then Green, Blu
The same operation as e is repeated three times in total. Switching of each light source is controlled by the image processing LSI 2c in the color scanner head cartridge 2 under the control of the CPU 3d. The flow of the data processing repeats the above contents three times each time reading is performed in three colors of RGB.

When the loading of the image data for one line is completed as described above, the CPU 3d and the controller 3
b, the paper is fed to the next reading line by driving the LF motor 3j controlled by the motor driver 3i, and the same operation is repeated. At this time, the movement of the carriage 5 is performed by driving the CR motor 3g controlled by the CPU 3d, the controller 3b, and the motor driver 3e as in the case of recording. These effects make it possible for the inkjet printer to function as a color reading device.

[0021]

However, the above-mentioned conventional carrier sheet has the following problems. That is, for example, when positioning a document such as a photograph having a margin around the index, the index indicating the reading range of the document and the position where the document is placed as described above, that is, positioning, so that the reading device does not read the margin of the document. When trying to match the index, there is a problem that the index becomes invisible and positioning becomes difficult. Further, as described above, since it is necessary to perform printing in a separate step of printing the index on a white sheet positioned below the original, the cost increases.

On the other hand, the image reading apparatus of the type in which the reading of the image is sequentially performed while the reading document is conveyed as described above has the following disadvantages.

(1) In the document transport type reading apparatus, it is necessary to provide an index of an insertion position according to the size of the document to be read on the protection sheet, so that the index is printed on the sheet and the sheet on which the index is printed is printed. The time and effort required for proper lamination causes an increase in cost. There is also a method of changing the size of the protection sheet according to the document size, but since it is necessary to prepare sheets of various sizes,
Not preferred.

(2) When no index is provided on the protective sheet,
If the insertion position of the document is incorrect, the readout range may deviate and the image may be missing. In this case, it is necessary to read the original while shifting the position of the original again, which is very inconvenient.

(3) In order to prevent the lack of an image due to an error in the position where the original is inserted into the protective sheet, the image is read at a considerably wider range than the original and then subjected to image processing. In this case, the amount of data is enormous, and the reading time is also significantly increased.

The present invention has been made in view of the above-described points, and enables easy positioning without hiding an index even when positioning a document such as a photograph having a margin around the document. A first object of the present invention is to provide an original conveying sheet, an image reading device, and an image reading method.
The purpose of.

The present invention has been made in view of the above points, and does not require a separate process such as printing an index on a sheet unlike the related art, and does not require a document reading range or a document placement position. It is a second object of the present invention to provide a document conveying sheet, an image reading apparatus, and an image reading method which can provide an index indicating the above.

Further, the present invention has been made in view of the above-mentioned points, and it is possible to prevent a loss of an image and to correspond to each original size with one size sheet.
It is a third object of the present invention to provide an image reading apparatus and an image reading method capable of minimizing the data amount and saving the reading time even when reading at high resolution.

[0029]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a pair of sheet members, one of which is transparent and one end of which is fixed, and a document is provided between the two sheet members. In a document transport sheet for inserting and transporting a document, an index indicating a document reading range, a document insertion position, and the like is formed as a punched hole in a fixed portion of the two sheet members.

In order to achieve the above object, a second aspect of the present invention is characterized in that one end portions of the two sheet members are bonded to each other.

To achieve the above object, a third aspect of the present invention is characterized in that both ends of the sheet members are welded to each other.

In order to achieve the above object, a fourth aspect of the present invention is to allow the other end portions of the two sheet members to be detachably fixed to each other, and to insert the index into a detachable portion of the two sheet members. It is characterized by being formed as a hole.

In order to achieve the above object, a fifth aspect of the present invention is characterized in that the other end portions of the two sheet members are detachable via a weak adhesive.

In order to achieve the above object, a sixth aspect of the present invention is characterized in that the other end portions of the two sheet members are detachable via a double-sided tape.

In order to achieve the above object, a seventh aspect of the present invention is characterized in that the two sheet members are formed from a thermoplastic material.

In order to achieve the above object, the invention of claim 8 is characterized in that the thermoplastic material is polyethylene terephthalate.

In order to achieve the above object, a ninth aspect of the present invention has a reading means for reading an original conveyed using the original conveying sheet according to any one of the first to eighth aspects. And

To achieve the above object, a tenth aspect of the present invention has a reading step of reading a document conveyed using the document conveying sheet according to any one of the first to eighth aspects. And

In order to achieve the above object, according to the present invention, there is provided an image reading apparatus having reading means for reading an image from a document conveyed by using a document conveying sheet. Storage means for storing white correction data, and detection means for detecting a document insertion position in the main scanning direction based on a comparison between reflection data of light illuminated on a document conveying sheet having a document inserted therein and the white correction data. And reading control means for changing the document reading range in the main scanning direction according to the detected document insertion position.

According to another aspect of the present invention, there is provided a white correction means for performing white correction based on light irradiation on a document conveying sheet in a state where a document is not inserted, and storing white correction data in the storage means. It is characterized by having.

According to another aspect of the present invention, there is provided an image reading apparatus having reading means for reading an image from a document conveyed by using a document conveying sheet. The reflectivity can be adjusted by changing the material of the white reference sheet so that the output signal level when reading the white reference sheet is the same.

According to a fourteenth aspect of the present invention, there is provided an image reading apparatus having reading means for reading an image from a document conveyed using a document conveying sheet. It is characterized in that the correction coefficient can be determined in advance so that the output signal level when the white reference sheet is read becomes the same.

In order to achieve the above object, the invention according to claim 15 is characterized in that the reading means is a sheet-through type scanner.

In order to achieve the above object, a sixteenth aspect of the present invention is characterized in that the reading means is detachable from the apparatus main body.

In order to achieve the above object, according to a seventeenth aspect of the present invention, there is provided an image reading method having a reading step of reading an image from a document conveyed by using a document conveying sheet. And a detecting step of detecting a document insertion position in the main scanning direction based on a comparison between reflected data of light irradiated on a document conveying sheet in which a document is inserted and the white correction data. And a reading control step of changing a document reading range in the main scanning direction according to the detected document insertion position.

In order to achieve the above object, the invention according to claim 18 is a white correction step in which white correction is performed based on light irradiation on a document conveying sheet in a state where a document is not inserted, and white correction data is stored in the storing step. It is characterized by having.

In order to achieve the above object, an invention according to claim 19 is an image reading method having a reading step of reading an image from a document conveyed by using a document conveying sheet, wherein the reading step includes the steps of: The reflectivity can be adjusted by changing the material of the white reference sheet so that the output signal level when reading the white reference sheet is the same.

According to a twentieth aspect of the present invention, there is provided an image reading method having a reading step of reading an image from a document conveyed using a document conveying sheet. It is characterized in that the correction coefficient can be determined in advance so that the output signal level when the white reference sheet is read becomes the same.

[0049]

Embodiments of the present invention will be described below with reference to the drawings.

[1] First Embodiment FIG. 1 is a perspective view showing an appearance of a carrier sheet 101 according to a first embodiment. The carrier sheet 101 is composed of, for example, a rectangular transparent sheet 102 and a white sheet 103 having the same shape, and both the transparent sheet 102 and the white sheet 103 are thermoplastic materials having good heat resistance and mechanical strength. For example, PET (P
olyethlene Terephthalate (polyethylene terephthalate). The carrier sheet 101 is
The document is used to enable the document to be conveyed in the image reading apparatus by sandwiching the document between the transparent sheet 102 and the white sheet 103. The transparent sheet 102
The material of the white sheet 103 is not limited to PET as long as it has the same function as PET.

The longitudinal direction (transport direction) of the transparent sheet 102 and the white sheet 103 constituting the carrier sheet 101
Are bonded at one end to form a bonded portion 104. The carrier sheet 101 has an adhesive portion 104
Is transported in a state where is the first. Further, a pair of indices 105, 105 indicating a reading range of the original, a position where the original is placed, and the like are formed as punched holes near both ends in the longitudinal direction of the adhesive portion 104 of the carrier sheet 101. The position, number, and shape of the indicators 105 are not limited to those shown in the drawings, but may be any as long as the document can be easily positioned.

When the original is sandwiched between the transparent sheet 102 and the white sheet 103 constituting the carrier sheet 101, the original is placed on the index 105, 10
By setting the number to 5, the document can be easily placed with the read range in mind. Note that one end of each of the transparent sheet 102 and the white sheet 103 constituting the carrier sheet 101 is not limited to the adhesive, and may be welded.

FIG. 2 is a perspective view showing an external configuration of an image reading apparatus on which the carrier sheet 101 according to the first embodiment is set, and a scanner head cartridge 210 and a print head cartridge 230 which are detachably attached to the image reading apparatus. is there. The image reading apparatus includes a scanner head cartridge 210, a print head cartridge 230, a carriage 240, a hook 242, and a flexible cable 244.
, A frame 245, a slide shaft 246, a slide plate 247, a drive motor 248, and the paper feed stacker 25.
0, a paper feed roller 251, an LF roller 252, a press roller 253, and a paper discharge roller 254.

The structure of each of the above-described units will be described together with the operation.
The scanner head cartridge 210 has substantially the same shape as the print head cartridge 230 and is configured as a detachable type that can be replaced with the print head cartridge 230 via the carriage 240 with respect to the image reading apparatus main body. Can be read. The electrical connection of the scanner head cartridge 210 to the image reading apparatus main body is made via a connector (not shown) common to the print head cartridge 230.

The print head cartridge 230 has substantially the same shape as that of the scanner head cartridge 210, and is configured to be detachable from the image reading apparatus main body and replaceable with the scanner head cartridge 210 via the carriage 240. Used to record (print) on top. The electrical connection of the print head cartridge 230 to the image reading apparatus main body is made via a connector (not shown) common to the scanner head cartridge 210.

The carriage 240 is a mechanism for mounting the scanner head cartridge 210 or the print head cartridge 230. When the scanner head cartridge 210 is mounted, the carriage 240
A contact portion (not shown) for transmitting and receiving a read control signal to and from the image reading apparatus main body via a connector portion (not shown) of the image reading apparatus. When the scanner head cartridge 210 is mounted on the carriage 240, the connector of the scanner head cartridge 210 is pressed by the hook 242 and a hook spring (not shown), and the connection between the carriage 240 and the scanner head cartridge 210 is securely performed. It is configured. After the read control signal passes through the contact portion of the carriage 240,
The image data is transferred to an image processing unit (not shown) of the image reading apparatus main body through the flexible cable 244.

A slide shaft 246 and a slide plate 2 are provided between the side plate portions 245A and 245B of the frame 245.
47 and the LF roller 252 are arranged in parallel at a predetermined interval. A drive motor 248 is provided inside the side plate portion 245A, and moves the carriage 240 via a belt (not shown). The carriage 240 is driven by a drive motor 248 to move the slide shaft 246.
And the print head cartridge 23 mounted on the carriage 240 by being reciprocated along the slide plate 247.
Reciprocate 0. As a result, reading or printing on the document is performed.

The paper feed stacker section 250 is a mechanism for feeding the carrier sheet 101 into the main body of the image reading apparatus, and is a place where recording paper is inserted when the image reading apparatus is used as a printer. Carrier sheet 1 with manuscript sandwiched
01 is fed from the feed stacker unit 250 into the main body of the image reading apparatus by the feed roller 251 with the adhesive portion 104 at the head, and the LF roller 252 and the pressing roller 253 are fed.
Is conveyed to the reading position below the carriage 240. Further, the carrier sheet 101 is
The one-line reading and the line feeding for the reading width are alternately performed by the reciprocation of
Is discharged to the outside of the image reading apparatus.

FIG. 3 is a cross-sectional view showing the relationship between the scanner reading section of the image reading apparatus according to the first embodiment and the document conveying rollers. 3, the scanner head cartridge 210 is mounted on a carriage 240 (see FIG. 2) that reciprocates in a direction perpendicular to the paper surface, and is reciprocated. The sensor reading unit 211 is used for reading an image from the document 207, and the read image of the reading unit L (in the range of the arrow in the drawing) of the sensor reading unit 211 via the lens 212 is used as an image as described above. The data is transferred to the image processing unit of the reading device.

Carrier sheet 101 sandwiching document 207
After passing through the LF roller 252 and the pressing roller 253 from the paper feed stacker unit 250 with the adhesive portion 104 at the top as described above, and passing through the reading unit L while being conveyed in the air above the platen unit 255, One paper discharge roller 254
A reaches between the position A and the spur 256A as the presser. In the drawing, reference numeral 254B denotes a second discharge roller, and reference numeral 256B denotes another spur. Next, when the carrier sheet 101 is intermittently fed,
The first line of the document 207 reaches the reading unit L, and the carriage 2
The first line is read by traveling 40 (see FIG. 2), and thereafter, the carrier sheet 101 and the original 207 are sequentially read.
Line reading and reading are continued.

As described above, according to the first embodiment, the transparent sheet 102 constituting the carrier sheet 101
In addition, one end in the longitudinal direction of the white sheet 103 is bonded (or welded), and the index 105 indicating the reading range of the document and the position of the document is formed on the bonding portion 104 (or the welding portion). Also, even when an original such as a photograph having a margin around it is positioned with respect to the carrier sheet 101, the positioning can be easily performed without the index being hidden and becoming invisible as in the related art. Also,
Since the hole serving as the index 105 can be processed at the same time when the outer shape of the carrier sheet 101 is die-cut, there is no need for a separate step of printing the index as in the related art, and the cost is very advantageous. Becomes

[2] Second Embodiment FIG. 4 is a perspective view showing an appearance of a carrier sheet 401 according to a second embodiment. The carrier sheet 401 is composed of, for example, a rectangular transparent sheet 402 and a white sheet 403 having the same shape. For example, both the transparent sheet 402 and the white sheet 403 are thermoplastic materials having good heat resistance and mechanical strength. For example, it is formed from PET (polyethylene terephthalate). The carrier sheet 401 is used for sandwiching a document between the transparent sheet 402 and the white sheet 403 to enable the document to be conveyed in the image reading apparatus.
The materials of the transparent sheet 402 and the white sheet 403 are as follows:
It is not limited to PET as long as it has a function equivalent to PET.

The longitudinal direction (transport direction) of the transparent sheet 402 and the white sheet 403 constituting the carrier sheet 401
Are bonded at one end to form a bonded portion 404. The carrier sheet 401 has an adhesive portion 404
Is transported in a state where is the first. A pair of indices 405, 405 indicating the reading range of the original, the position of the original, and the like are formed as punched holes near both ends in the longitudinal direction of the adhesive portion 404 of the carrier sheet 401.

Further, the rear end portion 406 which is the other end in the longitudinal direction of the transparent sheet 402 and the white sheet 403 constituting the carrier sheet 401 is coated with, for example, an adhesive having weak adhesiveness. Thereby, the carrier sheet 40
The other end portions in the longitudinal direction of the transparent sheet 402 and the white sheet 403 constituting the sheet No. 1 are detachable, and the integrity of the carry sheet 401 with the document sandwiched therebetween is enhanced. Note that a double-sided tape may be attached to each of the other ends in the longitudinal direction of the transparent sheet 402 and the white sheet 403 constituting the carrier sheet 401 instead of the weakly adhesive adhesive.

Further, the other ends of the transparent sheet 402 and the white sheet 403 constituting the carrier sheet 401 in the longitudinal direction are placed at positions opposite to the indices 405 and 405 formed on the adhesive portion 404, respectively. A pair of indices 407, 407 indicating the reading range, the position of the original, and the like, and a pair of indices 407, 407 are formed as punched holes. The positions, numbers, and shapes of the indicators 405 and 407 are not limited to those shown in the drawings, but may be any as long as the documents can be easily positioned.

When the original is sandwiched between the transparent sheet 402 and the white sheet 403 constituting the carrier sheet 401, the original is placed between the indexes 405 and 40 of the carrier sheet 401.
5 and the indices 407, 407, 407, 407, the reading range is clearer and the document can be easily positioned.
The transparent sheet 402 constituting the carrier sheet 401
Each end of the white sheet 403 is not limited to the adhesive and may be welded.

Further, an image reading apparatus in which the carrier sheet 401 according to the second embodiment is set, a configuration of a scanner head cartridge and a print head cartridge which can be detachably attached to the image reading apparatus (see FIG. 2), image reading The configuration showing the relationship between the scanner reading unit of the apparatus and the document transport roller (see FIG. 3 above), and the transport operation of the carrier sheet 401 are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, according to the second embodiment, the transparent sheet 402 constituting the carrier sheet 401
In addition to bonding (or welding) one end of the white sheet 403 in the longitudinal direction, an index 405 indicating the reading range of the document and the position of the document is formed on the bonding portion 4 (or the welding portion). The rearmost portion 40 which is the other end in the longitudinal direction of the transparent sheet 402 and the white sheet 403
6, the index 407 is also formed. Therefore, even when a document such as a photograph having a margin around the position is positioned with respect to the carrier sheet 1, the index is not hidden and becomes invisible as in the related art, and the reading range is further improved. And the positioning can be easily performed. In addition, indices 405 and 407
Can be simultaneously processed when the outer shape of the carrier sheet 401 is die-cut, so that there is no need for a separate step of printing an index as in the related art, which is very advantageous in terms of cost. . Further, it is possible to enhance the integrity in a state where the document is sandwiched between the carry sheets 401.

[3] Third Embodiment FIG. 5 is a block diagram showing a configuration of an image reading apparatus (inkjet printer) according to a third embodiment. The image reading device (inkjet printer) generally includes an ink head cartridge 1, a color scanner head cartridge 2, an image reading device main body (inkjet printer main body) 3, and a host computer (PC: personal computer) 4. .

The ink head cartridge 1 has a BJ (bubble jet) head 1a and a head driver 1b. The color scanner head cartridge 2 is
Sensor 2a, Red-LED (red light emitting diode), Green-LED (green light emitting diode), B
Light source 2 having lue-LED (blue light emitting diode)
b and image processing LSI (Large Scale Integration)
2c and an S-RAM (Static RAM) 2d.

The image reading apparatus main body (ink jet printer main body) 3 includes a carriage head terminal 3a, a controller (GA) 3b having a switching block, an interface (I / F, bidirectional Centronics interface: bidirectional printer). 8-bit parallel interface)
3c, CPU 3d, motor driver 3e, CR
(Carriage Return) detection sensor 3f, CR motor 3g, paper detection sensor 3h, motor driver 3i,
LF (Line Feed) motor 3j, RAM, ROM3
k. Although the RAM and ROM are shown in the same block in the figure, they may be separate blocks.

The ink head cartridge 1 is replaceable with the color scanner head cartridge 2 and is detachably attached to the main body of the image reading apparatus. Used by being mounted on a carriage. The head driver 1b
The J head 1a is driven. The BJ head 1a performs a recording (printing) operation on a recording medium by being driven by a head driver 1b.

The color scanner head cartridge 2 is
It is replaceable with the ink head cartridge 1 and is configured to be detachable from the image reading apparatus main body, and is used by being mounted on a carriage at the time of a document reading operation. The sensor 2a detects a reflected image obtained by irradiating the white reference sheet with light from the light source 2b as white correction data. Light source 2b
Are composed of RGB three-color LEDs. The image processing LSI 2c performs correction such as shading correction and binarization,
In addition to performing other image processing and switching control of the light source 2b, the detection signal of the sensor 2a is converted from analog to digital by a built-in analog / digital converter (not shown).

The carriage head terminal 3a of the image reading apparatus main body (ink jet printer main body) 3 is a signal path between the controller 3b, the head driver 1b of the ink head cartridge 1, and the image processing LSI 2c of the color scanner head cartridge 2. Becomes The controller 3b has a switching block, an interface 3c, a motor driver 3e, a CR detection sensor 3
f, controls the paper detection sensor 3h and the motor driver 3i and sends and receives signals.

The interface 3 c is a bidirectional 8-bit parallel interface for printers, and sends and receives signals between the image reading apparatus and the host computer 4. The CPU 3d controls various parts of the image reading apparatus based on a control program stored in the ROM 3k and performs various controls. The motor driver 3e controls driving of the CR motor 3g. The CR detection sensor 3f detects whether the carriage is at the start position. CR motor 3
g drives the carriage under the control of the CPU 3d, the controller 3b, and the motor driver 3e.

The paper detection sensor 3h detects whether a recording paper or an original for reading an image is set on the platen. The motor driver 3i drives and controls the LF motor 3j. The LF motor 3j performs a paper feeding operation up to the next reading line under the control of the CPU 3d, the controller 3b, and the motor driver 3i. RAM3k is CPU
Used as a 3d work area. ROM3k is C
The control program executed by the PU 3d is stored. The host computer 4 transfers recording data such as characters or images to the image reading device via the interface 3c, and stores white correction data and the like.

FIGS. 6 and 7 are plan views showing a state in which the original 9 is inserted into the protection sheet 17 according to the third embodiment. A portion indicated by a broken line in the drawing indicates a readable range 18. When the original 9 is properly inserted into the protective sheet 17 as shown in FIG. 6, the entire original 9 can be read because the original position is located within the readable range 18, but as shown in FIG. If the document 9 is inserted into the protection sheet 17 in an inappropriate state, there is a gap between the readable range 18 and the position of the document, so that reading is performed with a part of the document 9 missing.

Therefore, in the third embodiment, first, white correction is performed without inserting a document into the protection sheet 17 as shown in FIGS. 6 and 7 instead of the white reference sheet. Once the white correction data has been obtained, it can be stored in the host computer 4 once, so that it is not necessary to perform it every time unless deterioration of the image is noticed.
After the white correction is performed, the original 9 is inserted into the protective sheet 17, and the entire area of the first line is first read in a state where the protective sheet 17 with the inserted original 9 is conveyed and fed to the image reading apparatus.

FIG. 8 shows a state in which the protective sheet 17 has been fed to the reading start position of the mechanism of the image reading apparatus.
The color scanner head cartridge 2 is mounted on the carriage 5 and is reciprocally movable in the left-right direction in the figure along the guide shaft 7. In the figure, 3f is a CR detection sensor, 3g is a CR motor, 3h is a paper detection sensor, 3j is L
The F motor, 12 indicates a mirror.

At this time, in FIG. 7 and FIG.
In the range 19a in the main scanning direction where is not inserted, the same condition as that of the white correction is performed, so that the same output as the white correction data stored in the host computer 4 is obtained.
In the range 19b where the original 9 is inserted, the original 9
Since output data different from the white correction data is obtained according to the reflection level of, the difference can be detected as a difference between the output data. The position in the main scanning direction at which the data difference has occurred, that is, the amount of scanning in the main scanning direction of the carriage 5 to which the color scanner head cartridge 2 is attached is determined from the image processing LSI 2c of the color scanner head cartridge 2 to the image reading apparatus main body (inkjet printer main body). 3) The data is transferred to the CPU 3d, and the insertion position of the document 9 can be detected.

The scanning amount detected as described above is used by the CPU 3d of the image reading apparatus main body (inkjet printer main body) 3 and the host computer 4 when the original 9 is actually read.
The document insertion position in the main scanning direction is stored in the table. Therefore, by controlling and transmitting the signal of the reading start timing to the color scanner head cartridge 2, it is possible to easily prevent the read image from being lost even if the protection sheet 17 having no index is used. Further, since only the range suitable for the document size is read, the amount of data to be handled and the reading time can be reduced.

The operation of the mechanism will be described with reference to FIG. 8. The color scanner head cartridge 2 starts reading from the position where the carriage 5 is scanned to the original insertion position 19 a detected as described above, and 19 b. After reading the range indicated by, the original 9 is conveyed by one line, and reading of the next line is sequentially performed. Further, even if the original 9 is inserted in a state where the original 9 protrudes from the protection sheet 17, the control may be performed so that the reading is performed in the maximum readable range. Further, regarding the sub-scanning direction,
If the size of the document 9 is known in advance, the setting of the reading range is easy.

As described above, according to the third embodiment, the image reading apparatus is provided with the protection sheet 1 with no original inserted.
7, the white correction data detected by the sensor 2a based on the light irradiation from the light source 2b of the color scanner head cartridge 2 to the host computer 4 is stored in the host computer 4, and the white correction data according to the reflection level of the light irradiated on the protection sheet 17 in which the original is inserted. The CPU 3d detects the original insertion position in the main scanning direction based on the difference between the output data and the white correction data, and changes the original reading range in the main scanning direction according to the detected original insertion position. The document reading range in the main scanning direction can be determined by detecting the position of the read document, and the image is not lost even if the index of the insertion position according to the size of the read document is not provided on the protection sheet 17.
Further, it is possible to cope with various document sizes with the one-size protection sheet 17. Furthermore, by setting the reading range to an appropriate range according to the document size, the data amount can be minimized even when reading at a high resolution, and the reading time can be saved. is there.

[4] Fourth Embodiment An image reading apparatus (inkjet printer) according to a fourth embodiment comprises an ink head cartridge 1 and a color scanner head cartridge, as in the third embodiment. 2, an image reading apparatus main body (inkjet printer main body) 3, and a host computer (PC: personal computer) 4.

The ink head cartridge 1 has a BJ head 1a and a head driver 1b. The color scanner head cartridge 2 includes a sensor 2a, a light source 2b, an image processing LSI 2c, and an S-RAM 2d. The image reading apparatus body (inkjet printer body) 3 includes a carriage section head terminal 3a, a controller 3b, an interface 3c, a CPU 3d, a motor driver 3e, a CR detection sensor 3f, a CR motor 3g, and a paper detection sensor 3h. And the motor driver 3i
, An LF motor 3j, a RAM, and a ROM 3k (see FIG. 5). Since the configuration of each part has been described in detail in the third embodiment, the description is omitted.

In the third embodiment, the case where the white correction is performed on the protection sheet 17 has been described. However, in the fourth embodiment, the output when the white reference sheet and the protection sheet 17 are read is output. A method of adjusting the reflectance by changing the material of the white reference sheet so that the signal level becomes the same, or determining a correction coefficient in advance so that the output level of the white reference sheet and the output level of the protection sheet 17 become the same. Take the method of leaving. Thus, it is clear that the conventional white correction means can be used.

As described above, according to the fourth embodiment, the image reading apparatus uses the material of the white reference sheet so that the output signal level when the white reference sheet and the protection sheet 17 are read becomes the same. The third embodiment is different from the third embodiment in that control is performed to adjust the reflectance by changing the reflectance, or control is performed in which a correction coefficient is determined in advance so that the output level of the white reference sheet and the output level of the protection sheet 17 become the same. Similarly, it is possible to cope with various document sizes without missing images, and it is possible to minimize the amount of data even when reading at high resolution, thereby saving reading time. There is an effect that.

The image reading apparatus of the present invention may be applied to a system composed of a plurality of devices or to an apparatus composed of one device. A storage medium storing software program codes for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (or CPU or MPU) of the system or the apparatus executes the program code stored in the storage medium. Needless to say, this can also be achieved by executing the reading.

In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

Examples of a storage medium for supplying the program code include a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, and CD.
-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

Further, when the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS and the like running on the computer are actually executed based on the instructions of the program code. It goes without saying that a part or all of the above-described processing is performed, and the functions of the above-described embodiments are realized by the processing.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instruction of the program code, It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0093]

As described above, according to the first aspect of the present invention, there is provided a pair of sheet members, one of which is transparent and one end of which is fixed, and a document is inserted between the two sheet members. In the original conveying sheet for conveying the original, the index indicating the original reading range, the original insertion position, and the like are formed as punched holes in the fixed portions of the two sheet members. Even when the document is positioned with respect to the document transport sheet, the index can be easily positioned without the index being hidden and becoming invisible as in the related art.
Further, since holes serving as indices can be simultaneously processed when the outer shape of the sheet for document conveyance is die-cut, there is no need for a separate step of printing the indices as in the related art,
There is an effect that it is very advantageous in terms of cost.

According to the second aspect of the present invention, since one end portions of the two sheet members are adhered to each other, an index indicating a document reading range, a document insertion position, or the like is provided on the bonded portion of the two sheet members by stamping. By forming the holes, it is possible to easily position a document such as a photograph having a margin around the document conveying sheet as in the case of the first aspect, and to print the index as in the related art. There is an effect that the process is not required and the cost is very advantageous.

According to the third aspect of the present invention, since the one end portions of the two sheet members are welded to each other, an index indicating a document reading range, a document insertion position, or the like is provided at the welded portion of the two sheet members. By forming the holes, it is possible to easily position a document such as a photograph having a margin around the document conveying sheet as in the case of the first aspect, and to print the index as in the related art. There is an effect that the process is not required and the cost is very advantageous.

According to the fourth aspect of the present invention, the other end portions of the two sheet members can be detachably fixed to each other, and the index is formed as a punched hole in a detachable portion of the two sheet members. Therefore, it is possible to more easily position a document such as a photograph having a margin around the document conveying sheet, and a conventional index printing process is not required, which is very cost effective. This is advantageous. In addition, there is an effect that the integrity in a state where the document is sandwiched between the document conveying sheets can be improved.

According to the fifth aspect of the present invention, since the other end portions of the two sheet members are detachably attached to each other via a weakly-adhesive adhesive, when the document is sandwiched between the document transport sheets, By bonding the other end portions of the two sheet members to each other via a weak adhesive, there is an effect that it is possible to enhance the integrity in a state where the document is sandwiched between the document conveying sheets.

According to the sixth aspect of the present invention, the other end portions of the two sheet members are detachable via a double-sided tape. By pasting the other ends together via a double-sided tape, there is an effect that the integrity of the document sandwiched between the document transport sheets can be enhanced.

According to the seventh aspect of the present invention, since the two sheet members are formed of a thermoplastic material, an index indicating a document reading range, a document insertion position, or the like is used for bonding the two sheet members made of the thermoplastic material. Alternatively, by forming a punched hole in the welded portion, a document such as a photograph having a margin around the document can be easily positioned with respect to the document conveying sheet, similarly to the first aspect of the invention. This eliminates the need for a conventional index printing process, which is very advantageous in terms of cost.

According to the eighth aspect of the present invention, since the thermoplastic material is polyethylene terephthalate, an index indicating a document reading range, a document insertion position, and the like is formed on the adhesive or welded portion of the two sheet members made of polyethylene terephthalate. By forming the holes as the holes, it is possible to easily position a document such as a photograph having a margin around the document conveying sheet in the same manner as in the first aspect of the present invention, and to use a conventional index. This eliminates the need for the printing step and is very advantageous in terms of cost.

According to the ninth aspect of the present invention, the image reading apparatus has the reading means for reading the original conveyed by using the original conveying sheet according to any one of the first to eighth aspects. By using the original transport sheet when reading the original by the apparatus, an original such as a photograph having a margin around the original can be easily positioned with respect to the original transport sheet, similarly to the first aspect of the present invention. In addition to the above, there is an effect that the index printing process as in the related art is not required, and the cost is very advantageous.

According to a tenth aspect of the present invention, an image reading method includes a reading step of reading an original conveyed using the original conveying sheet according to any one of the first to eighth aspects. By using the original transport sheet when reading the original by the method, an original such as a photograph having a margin around the original can be easily positioned with respect to the original transport sheet as in the first aspect of the present invention. In addition to the above, there is an effect that the index printing process as in the related art is not required, and the cost is very advantageous.

According to the eleventh aspect of the present invention, in an image reading apparatus having reading means for reading an image from a document conveyed using a document conveying sheet, white correction data serving as a reference when reading an image from a document is used. A stored storage means;
Detecting means for detecting a document insertion position in the main scanning direction based on a comparison between the reflection data of light illuminated on the document conveying sheet in which the document is inserted and the white correction data; The reading control means for changing the scanning range of the original in the scanning direction makes it possible to determine the scanning range in the main scanning direction by detecting the position of the original inserted in the original transporting sheet, and according to the size of the scanning original. Even if the index of the inserted portion is not provided on the document conveying sheet, the image is not lost. In addition, it is possible to support various document sizes with a single-size document transport sheet. Furthermore, by setting the reading range to an appropriate range according to the document size, the data amount can be minimized even when reading at a high resolution, and the reading time can be saved. is there.

According to the twelfth aspect of the present invention, there is provided a white correction means for performing white correction based on light irradiation on a document conveying sheet with no original inserted and storing white correction data in the storage means. Once the white correction data has been obtained by the white correction means, it is not necessary to perform it every time.

According to a thirteenth aspect of the present invention, in an image reading apparatus having reading means for reading an image from a document conveyed by using the document conveying sheet, the reading means reads the document conveying sheet and the white reference sheet. 12. The reflectivity can be adjusted by changing the material of the white reference sheet so that the output signal level at the same time becomes the same.
As in the case of the invention of the third aspect, it is possible to cope with various document sizes without missing images, and it is possible to minimize the amount of data even when reading at high resolution and save reading time. This has the effect of making it possible.

According to a fourteenth aspect of the present invention, in an image reading apparatus having reading means for reading an image from a document conveyed using a document conveying sheet, the reading means reads the document conveying sheet and the white reference sheet. Since it is possible to determine the correction coefficient in advance so that the output signal level at the same time becomes the same, as in the case of the eleventh aspect, it is possible to cope with various document sizes in which image dropout does not occur. In addition, there is an effect that the amount of data can be suppressed to a minimum and reading time can be saved even when reading at high resolution.

According to the fifteenth aspect of the present invention, since the reading means is a sheet-through type scanner, an original is read by using the sheet-through type scanner.
As in the first invention, no loss of image occurs, it is possible to cope with various document sizes, and even when reading at a high resolution, the data amount is minimized to reduce the reading time. This has the effect that it becomes possible.

According to the sixteenth aspect of the present invention, since the reading means is detachable from the apparatus main body, the image reading can be performed by appropriately replacing the reading means with, for example, a recording means detachable from the apparatus main body. Alternatively, it is possible to perform both recording.

According to the seventeenth aspect of the present invention, in the image reading method having a reading step of reading an image from a document conveyed using the document conveying sheet, the white correction data serving as a reference when reading an image from the document is used. A storage step to be stored; a detection step of detecting a document insertion position in the main scanning direction based on a comparison between reflection data of light radiated on the document conveyance sheet in which the document is inserted and the white correction data; A reading control step of changing the document reading range in the main scanning direction according to the document insertion position, so that an image may be missing even if the index of the insertion position according to the size of the document to be read is not provided on the document conveying sheet. Absent. Also, 1
It is possible to support various document sizes with a document transfer sheet having a size. Further, there is an effect that the amount of data can be minimized even when reading at high resolution, and the reading time can be saved.

According to the eighteenth aspect of the present invention, there is provided a white correction step of performing white correction based on light irradiation on a document conveying sheet in a state where a document is not inserted and storing white correction data in the storing step. Once the acquisition of the white correction data by the white correction step is performed, there is an effect that it is not necessary to perform the acquisition every time.

According to the nineteenth aspect of the present invention, in the image reading method having a reading step of reading an image from a document conveyed using the document conveying sheet, the document conveying sheet and the white reference sheet are read in the reading step. Since the reflectivity can be adjusted by changing the material of the white reference sheet so that the output signal level at the same time is the same, various types of images that do not cause image loss as in the invention of claim 17 can be used. In addition, there is an effect that the data amount can be suppressed to a minimum and reading time can be saved even when reading at high resolution.

According to the twentieth aspect of the present invention, in the image reading method having a reading step of reading an image from a document conveyed using the document conveying sheet, the document conveying sheet and the white reference sheet are read in the reading step. Since it is possible to determine the correction coefficient in advance so that the output signal level at the same time becomes the same, it is possible to cope with various document sizes in which no image is lost, similarly to the invention of claim 17. In addition, there is an effect that the amount of data can be suppressed to a minimum and reading time can be saved even when reading at high resolution.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a carrier sheet according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating an external appearance of an image reading device on which a carrier sheet is set, a scanner head cartridge detachably attached to the image reading device, and a print head cartridge according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a relationship between a scanner reading unit and a document conveying roller of the image reading apparatus according to the first embodiment of the present invention.

FIG. 4 is a perspective view illustrating an appearance of a carrier sheet according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of an image reading apparatus according to third and fourth embodiments of the present invention.

FIG. 6 is a plan view illustrating a relative relationship between a protective sheet, a document, and a readable range according to a third embodiment of the present invention.

FIG. 7 is a plan view showing a relative relationship between a protective sheet, a document, and a readable range according to a third embodiment of the present invention.

FIG. 8 is a schematic plan view showing a state in which a protective sheet has been fed to a reading start position of a mechanism of an image reading apparatus according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing the appearance of a general ink head cartridge.

FIG. 10 is a perspective view showing the appearance of a general color scanner head cartridge.

FIG. 11 is a perspective view illustrating an appearance of a printing mechanism of a general inkjet printer.

FIG. 12 is a schematic sectional view showing the internal configuration of a general color scanner head cartridge.

13A and 13B are diagrams showing a configuration of a protection sheet according to a conventional example, wherein FIG. 13A is a side view and FIG. 13B is a plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink head cartridge 2 Color scanner head cartridge 2a Sensor 2b Light source 2c Image processing LSI 3 Inkjet printer main body 3a Carriage unit head terminal 3b Controller 3c Interface 3d CPU 3k RAM, ROM 4 Host computer 101, 401 Carrier sheet 102, 402 Transparent sheet 103 , 403 White sheet 104, 404 Adhesive part 105, 405, 407 Index 406 Last part

Claims (20)

[Claims] An original transporting sheet having a pair of sheet members, one of which is transparent and one end of which is fixed to each other, for inserting and transporting an original between the two sheet members. An original conveying sheet, wherein an index indicating an original insertion position and the like is formed as a die-cut hole in a fixing portion of the two sheet members. 2. The document conveying sheet according to claim 1, wherein one end portions of the two sheet members are adhered to each other. 3. The document conveying sheet according to claim 1, wherein one end portions of said sheet members are welded to each other. 4. The apparatus according to claim 1, wherein the other end portions of the sheet members are detachably fixed to each other, and the index is formed as a die-cut hole in a detachable portion of the sheet members. 4. The document conveying sheet according to any one of claims 1 to 3. 5. The document conveying sheet according to claim 1, wherein the other end portions of the two sheet members are detachable via a weakly adhesive. 6. The apparatus according to claim 1, wherein the other ends of the two sheet members are detachable via a double-sided tape.
5. The document transport sheet according to any one of claims 1 to 4. 7. The document conveying sheet according to claim 1, wherein said both sheet members are formed of a thermoplastic material. 8. The document conveying sheet according to claim 7, wherein said thermoplastic material is polyethylene terephthalate. 9. An image reading apparatus, comprising: reading means for reading a document conveyed using the document conveying sheet according to claim 1. Description: 10. An image reading method, comprising: a reading step of reading a document conveyed using the document conveying sheet according to claim 1. Description: 11. An image reading apparatus having reading means for reading an image from a document conveyed by using a document conveying sheet, a storage means for storing white correction data serving as a reference when reading an image from the document; Detecting means for detecting a document insertion position in the main scanning direction based on a comparison between the reflection data of light illuminated on the document conveying sheet in which the document is inserted and the white correction data; An image reading apparatus comprising: reading control means for changing a document reading range in a scanning direction. 12. The apparatus according to claim 11, further comprising white correction means for performing white correction based on light irradiation on a document conveying sheet in which a document is not inserted and storing white correction data in said storage means. Image reading device. 13. An image reading apparatus having reading means for reading an image from a document conveyed using a document conveying sheet, wherein an output signal level when the document conveying sheet and the white reference sheet are read by the reading means. An image reading apparatus, wherein a material of the white reference sheet is changed so as to make the same and reflectivity can be adjusted. 14. An image reading apparatus having reading means for reading an image from a document conveyed using a document conveying sheet, wherein an output signal level when the document conveying sheet and the white reference sheet are read by the reading means is provided. An image reading apparatus wherein a correction coefficient can be determined in advance so as to be the same. 15. The image reading apparatus according to claim 9, wherein said reading means is a sheet-through type scanner. 16. An image reading apparatus according to claim 9, wherein said reading means is detachable from an apparatus main body. 17. An image reading method including a reading step of reading an image from a document conveyed using a document conveying sheet, wherein a storage step of storing white correction data serving as a reference when reading an image from the document; A detection step of detecting a document insertion position in the main scanning direction based on a comparison between the reflection data of light illuminated on the document conveyance sheet into which the document is inserted and the white correction data; A reading control step of changing a document reading range in the scanning direction. 18. The method according to claim 17, further comprising a white correction step of performing white correction based on light irradiation on a document conveying sheet in a state where a document is not inserted, and storing white correction data in the storing step. Image reading method. 19. An image reading method having a reading step of reading an image from a document conveyed using a document conveying sheet, wherein an output signal level when the document conveying sheet and the white reference sheet are read in the reading step is An image reading method, wherein the material of the white reference sheet is changed so that the reflectance is adjusted so as to be the same. 20. An image reading method having a reading step of reading an image from a document conveyed by using a document conveying sheet, wherein an output signal level when the document conveying sheet and the white reference sheet are read in the reading step is An image reading method, wherein a correction coefficient can be determined in advance so as to be the same.