JP2003338903A - Scanning holder with white reference sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve image reading quality for a manuscript by obtaining a substantially uniform readout condition (distance from a scanner) between the case for the manuscript and that for a white reference sheet for use as lightness and color reference when reading the manuscript, thus enabling readout conditions of little difference. <P>SOLUTION: An extremely thin white reference sheet is integrally bonded with a scanning holder for carrying a manuscript, and the manuscript is set beneath the white reference sheet when reading the white reference sheet, while the manuscript is set on the white reference sheet when reading the manuscript. Thus, the distance from the scanner to the manuscript surface, and from the scanner to the white reference sheet becomes virtually identical, enabling readout conditions of little difference between the manuscript and white reference sheet. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document transport assisting member (hereinafter referred to as a document transport assisting member) which transports a document to a reading section with upper and lower portions sandwiched between members so as to prevent the document from being stained. (Hereinafter referred to as a scanning holder) and a method for performing white reference correction of a reading apparatus using the scanning holder. 2. Description of the Related Art In recent years, a demand for a document reading apparatus for inputting an image has been increasing. There are a wide variety of devices, including a flatbed type document reading device that has a platen and can read even thick books, and a film reading device that can read directly from photographic film. [0003] Among them, there is a band scan type reader as a reader which can be realized with a small space configuration. FIG. 8 is a schematic diagram of a general reading device. The light emitted from the light source 86 illuminates the original 18g via the condenser lens 85, and the original is read using the lenses 82 and 83 to read the original image.
4 and read the image. The reading device 87 moves in the direction a with respect to the document 18g, and after reading the required amount, the document 18g or the reading device 87 shifts in the direction b perpendicular to the direction a and repeats reading in the direction a. Since such a movement is similar to the movement of a printing apparatus, a printing apparatus having a unitized reading device (hereinafter referred to as a scanner head) mounted on a carrier on which a printing head of the printing device is mounted is also known. Is appearing. An example is shown in FIG.
As shown in FIG. A scanner head 300 is removably mounted on the carrier 2 alongside the print head 1. The appearance of the scanner head 300 is as shown in FIG. 3, and a field lens 304 and an imaging lens 301 for forming a read image in an internal cavity of a box-shaped scanner head case 300b, a sensor 302 at an imaging position on the optical axis, An illumination LED 306 and a condenser lens 315 for illuminating the reading surface are arranged, guided to the carrier 2 at a positioning position by a guide portion 314, etc., and the latch member 30Y of the carrier 2 is operated by the arm 30Ya to move the scanner head 300 to the carrier 2. When pressed, the electric signal from the printer is coupled by pressure contact between the carrier terminal portion (not shown) and the head terminal portion 309. The head terminal portion 309 is connected to a main electric circuit board (not shown) for controlling sensors and illumination LEDs inside the scanner head case 300b via the wiring board 305. When such a configuration is adopted, printing and reading can be performed by one apparatus, and there are advantages such as a small space, a cost reduction by common use of a power supply and a housing, and on the other hand, an ink jet system is adopted as a printing apparatus. In this case, the ink mist attaches to the platen 9 of the printing apparatus to stain the original, or the spur 8 for pressing the printing paper 18i damages the original. Generally, a document is conveyed by sandwiching the document between auxiliary members. The reading device obtains a reference of brightness and color when reading an original by conveying and reading a white sheet called a white reference sheet 18w. Details will be described with reference to FIG. Assuming that the distance from the scanner head 300 to the surface of the document is t2, it is most preferable that the white reference sheet 18w be read at the same distance as the white reference sheet 18w. On the other hand, the thickness t1 (the thickness of the document + the thickness of the base sheet) from the platen to the surface of the document sandwiched between the scanning holders 18s changes according to the thickness of the document, and thus the distance t2 varies depending on the document. Since it is complicated to make the thickness tw of the white reference sheet the same as the thickness of each document, an object having an intermediate thickness between the maximum thickness t1max and the minimum thickness t1min that can be transported on the transport path of the reading device. tw was prepared. As a conventional example, the base sheet and the cover sheet are 0.1 mm, and the thickness of the document sandwiched between the base sheet and the cover sheet is minimum 0.01 mm (thickness min) and maximum 0.25 mm (thickness max). t1min = 0.11 mm, t1ma
Since x = 0.35 mm, the thickness of the white reference sheet is 0.2
It was set to 3 mm. Therefore, when there is a difference in thickness depending on the original, accurate reading may not be performed. SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a scanning holder that can cancel the variation in the thickness of a document and read the distance as a distance to the document surface when reading a white reference sheet. To provide [0010] A scanning holder as a means for solving the above-mentioned problem is that a scanning holder is overlapped by joining at least one end thereof so that a document can be held between a base sheet and a transparent cover sheet. A white reference sheet is interposed between the base sheet and the cover sheet, one end of the white reference sheet is joined to the base sheet and / or the cover sheet, and the white reference sheet is used to perform the white reference correction of the reading device. When reading the original, the original is passed between the white reference sheet and the base sheet through the transport path, and the white reference is corrected by reading the white reference sheet in the middle thereof. The original is read between the cover sheet and the white reference sheet through the conveyance path while being interposed between the cover sheet and the white reference sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a scanner head as a reading apparatus which can be detachably mounted beside a print head mounting portion of an ink jet printer independently of a print head will be described as an embodiment. FIGS. 2 and 4 are perspective views showing a reading apparatus according to the present invention. The reading device is composed of the same members as the conventional one. 2 and 4, the carrier 2 holds the print head 1 and the scanner head 300 in a detachable manner. The carrier 2 includes a guide shaft 4 and a guide rail 7 having both ends fixed to a frame 25 and arranged in parallel with each other. ,
The print paper 18i and the scanning holder 18s are supported so as to be slidable in a direction perpendicular to the conveying direction and parallel to the surface of the print paper 18i and the scanning holder 18s. The carrier 2 is coupled to a portion of the belt 5 looped between a drive pulley 30 that is driven to rotate by a carrier motor 6 by a gear train (not shown) and an idle pulley 15 that is rotatably supported. By driving the belt 6, the belt 5 is driven, and the carrier 2 reciprocates in the above-described direction. A home position sensor 16 detects the position of the carrier 2 by detecting the passage of the carrier 2. Reference numeral 3 denotes a flexible cable for transmitting an electric signal from a control board (not shown) to the print head 1 and the scanner head 300. Next, a configuration for transporting the printing paper 18i and the scanning holder 18s will be described. Since the present invention has a configuration in which the printing device and the reading device are integrated, two types of paper are passed: a printing paper 18i for printing and a scanning holder 18s for sandwiching the original and the white reference sheet. Reference numeral 19 denotes an automatic paper feeding unit which separates a plurality of set printing papers 18i and a scanning holder 18s one by one and conveys them to the paper feed roller 14. Frame 25
An LF gear 31 is fixed to the paper feed roller 14 rotatably supported by the paper feed roller 20, and is driven by a paper feed motor 20 to rotate in a gear train (not shown). A pinch roller 21 is pressed against the paper feed roller 14 from below by a pinch roller spring 23 via a pinch roller holder 22, and a printing paper 18 i sandwiched between the paper feed roller 16 and the pinch roller 21, a scanning holder 18 s Is conveyed by driving the paper feed motor 20. Reference numeral 11 denotes a paper discharge roller for discharging the recording paper 18i and the scanning holder 18s after recording, and a driving force is transmitted from the paper feed roller 14 by an idle gear train 29, and the paper feed roller 14
It rotates in synchronization with. The spur 8 is pressed against the paper discharge roller, and the print paper 18i and the scanning holder 18s are sandwiched between the paper discharge roller 11 and conveyed. Reference numeral 17 denotes a paper sensor, which is a printing paper 18i just before the paper feed roller 14 and the scanning holder 1.
8s is detected. Reference numeral 10 denotes a paper discharge sensor, which detects the presence or absence of the printing paper 18i near the paper discharge roller 11 and the scanning holder 18s. The function of this apparatus as a recording apparatus is to perform one-line recording on the printing paper 18i by discharging the ink downward in FIG. 4 according to the recording signal by the print head 1 in synchronization with the reciprocating movement of the carrier 2. It is. That is, the print head 1 has a fine liquid discharge port (orifice), a liquid path, an energy action section provided in a part of the liquid path, and an energy for generating a droplet forming energy to act on the liquid in the action section. Generating means. Examples of the energy generating means for generating such energy include a recording method using an electromechanical transducer such as a piezo element, an energy for irradiating an electromagnetic wave such as a laser to generate heat, and discharging a liquid by the action of the heat. There is a recording method using a generating unit, or a recording method using an energy generating unit that discharges the liquid by heating the liquid with an electric heat converter such as a heating element having a heating resistance. Among them, a print head used in an ink jet recording method for discharging a liquid by thermal energy has a high density of liquid discharge ports for discharging a recording liquid to form a discharge droplet. This makes it possible to record at a high resolution. Among them, a print head using an electrothermal converter as an energy generation source can easily be made compact, and has the advantages of IC technology and micro-fabrication technology, which have recently made remarkable progress in technology in the semiconductor field and markedly improved reliability. This is advantageous because it can be used for two reasons, high-density mounting is easy, and the manufacturing cost is low. When one line is recorded by moving the print head 1, the printing paper 18i is conveyed by the paper feed motor 20 for one line in the direction of the arrow in the conveying direction shown on the printing paper 18i and the scanning holder 18s in FIG. The recording is performed on the next line. The printing apparatus is provided with an automatic paper feeding unit 19 for separating the loaded printing paper 18i and the scanning holder 18s one by one and feeding the printing paper to the printing apparatus. The scanner head 300 is connected to the carrier 2
When attached to the CPU 502, the CPU 502
3, the head recognition signal is read, and the mounting of the scanner head 300 is recognized. When entering the scanner mode depending on the situation,
As with the printing paper 18i, the scanning holder 18s is transported to a predetermined position by driving the automatic paper feeding unit 19 and the paper feed motor 20, and the image signal is read via the scanner driver unit 513 while driving the carrier motor 6 ( (Fig. 5). When the reading of one line is completed, the sheet is conveyed by one line by the paper feed motor 20 and the next line is read. Such an operation is performed until the end of the document. In the case of the white reference reading, the sheet is ejected after the calibration data of the scanner head 300 is obtained. At one end of the moving range of the carrier 2, there is a cap 13 for protecting the liquid discharge port of the print head 1 from drying. When the carrier 1 is located in the home position, a paper feed motor 20 causes a power transmission mechanism (not shown) to operate. ,
The cap 13 is pressed against the print head 1. Further, an ink suction operation for cleaning the liquid ejection port is also performed here. A blade 12 for cleaning the surface of the print head 1 having the liquid discharge port is provided on the cap 13 side, and the operation of the carrier 2 squeezes the liquid discharge port surface by a link mechanism (not shown). By this operation, foreign matter such as dust adhering to the vicinity of the nozzle on the ejection port surface is removed, and normal recording is always performed (wiping operation). When the scanner head 300 is mounted on the carrier 2, in the capping operation and the wiping operation, the side of the cap 13 and the blade 12 of the scanner head 300 are located farther away from the print head 1 so as not to contact the scanner head 300. Next, a block diagram of an electric circuit of the document reading apparatus according to this embodiment will be described. FIG. 5 is a block diagram showing an electric circuit configuration of the printing apparatus according to this embodiment. In the figure, 50
Reference numeral 1 denotes a logic controller that performs main control;
Is a microcomputer in the form of a microcomputer for executing a certain procedure; 503 is a RAM provided with an area for expanding text data and image data, a work area, and the like;
Reference numeral 04 denotes a ROM that stores programs corresponding to the above procedure and other fixed data such as font data.
A timer 506 for creating an execution cycle of the PU 502 and for creating a necessary timing at the time of a recording operation by the printing device unit. An interface unit 506 connects a signal from the CPU 502 to a peripheral device. Reference numeral 507 denotes a power controller for the printing unit and the scanner unit. Reference numeral 508 denotes the presence or absence and type of the print head and the scanner head, the output value of a sensor for detecting the temperature of the print head, and the amount of ink in the print head 1. A head detection unit for detecting print head information such as a sensor output for detecting the presence / absence; 509, a line buffer for storing print data of the print head; 510, a head driver for transmitting a print signal and power to the print head; b denotes a motor driver which sends out signals and electric power necessary for driving the carrier motor 6 and the paper feed motor 20, respectively;
12 is a home position sensor 16 and a paper sensor 1
7, a sensor detection unit that detects the output of a sensor such as the paper ejection sensor 10. Reference numeral 513 denotes a scanner driver when the scanner head is mounted. Also, the head detection unit 50
8. The flexible cable 3 is commonly used for exchanging data signals between the head driver 510, the scanner driver 513, the print head 1, and the scanner head 300. Reference numeral 514 denotes an operation unit of a power switch and a head replacement switch for performing head replacement, 515 denotes a display unit for displaying a state, and 516 denotes, for example, an FDD, an HDD, and a RAM.
An external storage device 517 such as a card is an external interface (Centronics port, RS232C port, USB, or the like) for communicating with another information processing device or receiving a print or document reading command from an external control device. . Reference numeral 519 denotes a power supply.
01 is always supplied, and the CPU 502 monitors input signals from the operation unit 514 and the external interface 517 through the interface unit 506. The power supply to the power controller unit 507 is controlled by a switch 518 controlled by the CPU 502 through the interface unit 506. The power supply 519 is supplied with power from an AC power supply (not shown) or a battery. FIG. 3 shows a schematic sectional view and a perspective view of the scanner head 300. The scanner head 300 is also formed of the same members as in the related art, similarly to the reading device. 3 in FIG.
Reference numeral 06 denotes an LED for illuminating the document surface 303, which is an LE for three colors of red, green, and blue for performing color reading.
D is arranged. LE emitted from LED 306
The D light 307 is transmitted through the condenser lens 315 to the LED opening 3.
11 illuminates the original 18 g or the white reference sheet 102 in the scanning holder, and the image light 308 passes through the field lens 304 and the imaging lens 301 provided in the sensor opening 312 and forms on the sensor 302. Image.
In the present invention, a linear image sensor having 256 pixels is used. The LED 306 and the sensor 302 are connected to a main electric circuit board (not shown) for controlling them, and control signal lines of the main electric circuit board (not shown) are externally connected by a wiring board 305 electrically connected. Has been drawn to. Electrodes are formed on the head terminal portion 309 of the wiring board 305, and the electrodes are brought into contact with the electrodes of the carrier 2 (not shown) by pressure contact, so that signals can be guided to the main body side control circuit. The external appearance of the scanner head 300 is substantially a box shape, and the same as the print head 1,
With reference to the positioning boss 310 and the positioning notch 313, the pressure contact portion 319, which is a part of the scanner head case 300b, can be mounted by fitting into the latch member 30Y of the carrier 2. Also, when removing the arm 30Ya of the latch member 30Y, the pressing portion 31
9 is disengaged and can be easily removed. When the CPU 502 is mounted on the carrier 2, the CPU 502 reads the head recognition signal of the wiring board 305 via the scanner driver unit 513, and enters a scanner mode depending on the situation. The CPU 502 is connected to the external interface 51
7, when a document reading signal is input from the
i, the scanning holder 18s
After being conveyed to a predetermined position by driving the paper feed motor 20 and turning on the LED 306, the image signal is read via the scanner driver unit 513 while driving the carrier motor 6. Here, the driving speed of the carrier motor 6 can be changed depending on the original reading mode of the scanner head 300. The mode is a combination of the reading resolution and the gradation of each reading value. The printing apparatus has a resolution of 600 dpi in the main scanning direction, and the resolution of the sensor 302 of the scanner head 300 is 600 d in the sub-scanning direction.
Therefore, an output of 256 gradations can be obtained in the main scanning direction and 600 dpi in the sub-scanning direction, for example.
There is a mode in which reading is performed in gradations, reading is performed in two gradations in the main scanning direction at 75 dpi and sub-scanning direction is 75 dpi, and reading is performed at a resolution of 200 dpi in the main scanning direction, taking into consideration the consistency with FAX. Main scanning direction 6000dp
i, in a mode having a large amount of data such as reading of 256 gradations in the 600 dpi in the sub-scanning direction, it takes time to process and transfer data. Therefore, the carrier driving speed is reduced, and the mode is set to 75 dpi in the main scanning direction and 75 dpi in the sub scanning direction. In the gradation reading, the carrier driving speed can be increased. In order to read a color original, the above operation is repeated three times for each of the three color LEDs. When the reading of one line is completed, the sheet is conveyed by one line by the paper feed motor 20 and the next line is read. Such an operation is performed until the end of the document. The standby position of the carrier 2 when the scanner head 300 is mounted on the carrier 2 does not need to be the same as the position when the print head 1 is mounted. Recovery unit for maintenance (blade 12 and cap 13)
If the shape avoids the above, the standby position may be moved to the recovery section side, and the generated movable section may be used as an idle section for increasing the traveling stability of the carrier 2. FIG. 6 is a block diagram of an electric circuit of the scanner head. When the scanner head 300 is mounted on the carriage 2, the head terminal portion 309 of the scanner head 300 comes into pressure contact with a terminal portion (not shown) formed on the flexible cable 3 wired to the carriage 2, and is connected to the power controller 507. You. The power controller 507 communicates data and commands bidirectionally via the scanner driver 513, and the scanner head 300 communicates data and commands via the I / O port 601. Image light 3 of document 18g illuminated by LED
08 is detected by the sensor 302 having photoelectric conversion characteristics as image data. The signal detected by the sensor 302 is supplied to the amplifier 6
At 04, the signal is amplified to an optimum level at the level handled by the analog / digital converter 603 and input to the analog / digital converter 603. Here, the data converted into digital data is subjected to shading correction, binarization correction, and other image processing by an image processing LSI 602, and then to a power controller 5 via a flexible cable 3.
07. The white reference data for each pixel of the sensor 302 obtained by reading the white reference sheet is used for image processing L.
It is stored in a register in the SI 602 and used for each process. FIG. 7 shows an external view of the printing apparatus of the present invention. Reference numeral 701 denotes the appearance of the printing apparatus. Figure 2 inside
Is accommodated. Reference numeral 702 denotes a discharge port of the printing paper 18i and the scanning holder 18s. 7
Reference numeral 03 denotes a cover for opening and removing the print head and the scanner head. Reference numeral 704 denotes a power switch.
The CPU 502 monitors the input of this switch, and when it is input, the CPU 502 turns on the switch 518 of the power supply to the power controller 507 through the interface 506. 515
Is a display unit for displaying the status of the document reading apparatus, and 705 is a paper feed port of the printing paper 18i and the scanning holder 18s. The fed printing paper 18i and the scanning holder 18s are guided to the automatic paper feeding unit 19 shown in FIG. 706
Is a head replacement switch that is input when the print head 1 or the scanner head 300 is attached or detached. By pressing the switch, the carrier 2 moves to a position where the print head 1 or the scanner head 300 is easily attached or detached. Next, the gist of the present invention will be described with reference to FIG. The scanning holder 100 of this embodiment is
The base sheet 103, the white reference sheet 102, and the cover sheet 101 are integrally joined at the binding section 104. It is transported to the transport path in the direction of arrow 105. Base sheet 103 and cover sheet 10
Numeral 1 is made of a flexible member, and in this embodiment, has a thickness of 0.1.
Made of 1mm PET material. The cover sheet 101 is made of a PET material that is transparent and has no difference in transmittance depending on the wavelength of light. The white reference sheet 102 bound in the middle has a thickness of 0.
A sheet having a reflectance of about 05 mm and a reflection density of 0.1 or less, which is also made of PET. The thickness of the white reference sheet 102 is preferably as thin as possible if the original placed on the back of the white reference sheet 102 cannot be seen through. The shapes other than the thicknesses of the base sheet 103, the white reference sheet 102, and the cover sheet 101 are substantially the same. The white reference sheet 102 is read under the same conditions as the original document to correct variations in the sensitivity and the amount of received light for each pixel of the sensor 302, and the obtained white reference signal for each sensor is
This member is necessary to divide a signal (black reference) when the sensor does not receive light by the desired number of gradations to obtain a gradation that absorbs variations among sensor pixels. Therefore, it is desirable that the white reference sheet has the same distance from the surface of the original to be read and the scanner head 300. In the present invention, FIG.
Description will be made along 0. FIG. 10A shows a case where the white reference sheet 102 is read. The original 18 g to be read is sandwiched between the white reference sheet 102 and the base sheet 103. The scanning holder 100 sandwiching the original 18g is sent from the automatic paper feeding unit 19 of the printing apparatus to the inside of the transport path. After the paper is fed, stop in the state shown in FIG.
After moving the carrier 2 on which the scanner head 300 is mounted onto the white reference sheet 102, the PU 502
6 is turned on, the signal from the sensor 302 is read, and is used as a reference for the image signal. After obtaining the white reference data, the scanning holder 100 is ejected. FIG. 10B shows a case where the original 18g is read.
An original 18 g to be read is sandwiched between the cover sheet 101 and the white reference sheet 102. The scanning holder 100 sandwiching the original 18g is sent from the automatic paper feeding unit 19 of the printing apparatus to the inside of the transport path. The reading of the original is as described above. After reading, the scanning holder 100 is ejected. Here, from the platen 9 to the white reference sheet 102
And the thickness t1 of the original 18g up to the side of the scanner head.
10A and FIG. 10B, the white reference sheet 102 and the original 1
It is the same because only 8g has been replaced. Therefore, regardless of the thickness of the original 18g, the white reference sheet 10
2 and the scanner head 300 are the same as the original 18g. As described above, the scanning holder 100 is connected to the base sheet 103 and the white reference sheet 10.
2. When the white reference sheet 102 is read, the original 18g to be read is sandwiched between the white reference sheet 102 and the base sheet 103. When reading the original 18g, the original 18g to be read is placed on the cover sheet 101. By sandwiching between the white reference sheets 102, the thickness between the white reference sheet 102 and the scanner head 300 becomes the same as that of the original 18g, regardless of the thickness of the original 18g. With this, high-quality reading has become possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing an embodiment of a scanning holder. FIG. 2 is a schematic perspective view of the printing apparatus. FIG. 3 is a schematic perspective view of a scanner head mounted on the printing apparatus. FIG. 4 is a schematic sectional view of the printing apparatus. FIG. 5 is a schematic electric circuit diagram of the printing apparatus. FIG. 6 is a schematic electric circuit diagram of a scanner head mounted on the printing apparatus. FIG. 7 is a schematic external view of the printing apparatus. FIG. 8 is a schematic structural diagram of a band scan type scanner. FIG. 9 is a schematic diagram of a conventional white reference reading. FIG. 10 is a schematic diagram of white reference reading according to the present invention. [Description of Signs] 1 Print head 2 Carrier 3 Flexible cable 4 Guide shaft 5 Belt 6 Carrier motor 7 Guide rail 8 Spur 9 Platen 11 Discharge roller 14 Paper feed roller 15 Idle pulley 16 Home position sensor 17 Paper sensor 18i Print paper 18s Scanning holder (document, white reference sheet) 18 g document 18 w white reference sheet 19 automatic paper feeder 20 paper feed motor 21 pinch roller 25 frame 29 idle gear 30 pulley 31 LF gear 100 scanning holder (document, white reference sheet) 300 scanner head 300b Scanner head case 301 Imaging lens 302 Sensor 304 Field lens 306 LED 309 Head terminal 502 CPU 503 RAM 504 ROM 505 Timer 506 Interface unit 507 Power controller 508 Head detection unit 509 Line buffer 510 Head driver 511 Motor driver 512 Sensor detection unit 513 Scanner driver unit

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Claims (1)

Claims: 1. A transport path for sending an original, and a scanning holder having at least one end joined and overlapped so that the original can be held between a base sheet and a transparent cover sheet. In the scanning holder of the reading device that sends a document along the conveyance path by a conveyance auxiliary member to be called, a white reference sheet of the reading device is sandwiched between the base sheet and the cover sheet, and one end of the white reference sheet is the base sheet or When performing white reference correction of the reading device by joining with the cover sheet or both, the original is passed between the white reference sheet and the base sheet through the conveyance path, and the white reference sheet is read on the way. When the original is read by reading the original, the original is passed between the cover sheet and the white reference sheet through the transport path. Scanning holder and the white reference correction method characterized in that reading the document in.