JPH04208765A - Electronic appliance - Google Patents

Abstract

PURPOSE:To put a document into the same state as the state in which the document is transported straightforward in a transporting path and is read by judging the way of bending and correcting the image data stored in a memory according thereto when the document is read by an image sensor while the document is held bent in a transporting. direction. CONSTITUTION:The contents of the document are read by the image sensor 10 and the image data are stored into a memory. The inclination of the document is calculated by a bend judging means 61 of a CPU 41 from the difference between the edges on respective one side of the document detected by 1st and 2nd detecting means 12, 13 and the installation distance between these two detecting means if the document set on a tray 2 is withdrawn in a bent state at the time when the document is withdrawn into the transporting path 7. The image data are then read from the memory by a correcting means 62 and the entire part thereof is rotated by as much as the angle of inclination toward the direction reverse from the direction of the document and is restored into the memory. Then, the state similar to the state in which the document is transported straightforward in the transporting path 7 and is read is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to electronic equipment including a document reading device such as a facsimile machine and a copying machine.

(Prior Art) For example, in a facsimile machine, when transmitting a document, the document to be transmitted is set on a tray, the recipient is designated by inputting a telephone number, etc., and a transmission command is issued.

Based on the operation of this transmission command, the document on the tray is pulled into the conveyance path, the contents of the document are read by an image sensor installed in the conveyance path, and the document is discharged from the discharge port. The data read by this image sensor is transmitted as is to the other party, but after being stored in the memory, it is transmitted all at once.

(Problems to be Solved by the Invention) By the way, although the tray is provided with guide pieces for guiding both side edges of the original, the original may be set slightly crooked when it is time to set the original. Further, when a document set on a tray is drawn into the conveyance path, the document may be bent and drawn into the conveyance path due to slipping between the document and the pull-in roller.

In such cases, the document is conveyed in a bent state through the conveyance path and read by the image sensor, so when this data is printed out on recording paper by the receiving facsimile machine, the document is bent against the recording paper. The received content was printed out in a state where the received information was printed out, and the vertical and horizontal lines were particularly jagged and difficult to read.

The present invention has been made in view of the above points, and an object of the present invention is to provide an electronic device that can automatically correct the curvature of the read and stored data even if the original is read with an image sensor in a bent state. The purpose is to

[Structure of the invention]

(Means for Solving the Problems) The invention according to claim 1 includes: an image sensor that reads a document conveyed within a conveyance path; a memory that stores image data of the document read by the image sensor; first and second detection means, which are respectively provided at a predetermined distance in the conveyance direction and detect the side edge position of the document being conveyed in the conveyance path; a curvature determining means for determining the degree of curvature of the document with respect to the conveying direction based on the position of each side edge of the detected document and the installation distance of the first and second detecting means; and a correction means for correcting the image data stored in the memory.

The invention according to claim 2 is the invention according to claim 1, further comprising: a document width detecting means for detecting the width of the document conveyed in the conveyance path;
The apparatus further includes a regulating means for preventing the correcting means from performing correction processing when it is determined that the width of the original is not substantially constant as a result of the detection by the document width detecting means.

According to a third aspect of the invention, in the first aspect, the image sensor is composed of a CCD, and is used as either the first or second detection device.

(Function) According to the first aspect of the invention, the content of the document being conveyed through the conveyance path is read by the image sensor, and the read image data is stored in the memory.

At this time, if the document is read by the image sensor in a state where it is bent in the transport direction, the degree of curvature of the document in the transport direction is determined, and the image data stored in the memory is adjusted according to the degree of curvature. The correction is made so that the state is the same as when the document is conveyed straight through the conveyance path and read.

In the invention of claim 2, in the invention of claim 1, if it is determined that the width of the document is not constant, even if it is determined that the document is curved with respect to the conveyance direction, the image data stored in the memory is This is to prevent the image data from being erroneously corrected.

In the invention of claim 3, in the invention of claim 1, the CCD
An image sensor consisting of the following is used as either the first or second detection means to prevent the number of detection means from increasing and to simplify the structure and reduce costs.

(Example) Hereinafter, the configuration of an example of the present invention will be described with reference to the drawings.

FIG. 3 shows the structure of a facsimile machine. On the top of the machine body 1, there is a tray 2 for setting the original to be sent, a tray 3 for receiving the original to be ejected after reading has been completed, and a tray 4 for receiving the recording paper on which the received data has been printed. is provided.

The document insertion port of the tray 2 and the document discharge port of the tray 3 are communicated with each other by a conveyance path 7 formed between guide plates 5 and 6 in the machine body 1. This conveyance path 7 is provided with a pull-in roller 8 at its entrance to draw the document on the tray 2 into the conveyance path 7, an ejection roller 9 at its exit to discharge the document onto the tray 3, and an intermediate A horizontally elongated image sensor 10 using COD for reading the contents of a document and a white roller 11 for bringing the document into close contact with the reading surface of the image sensor 10 are disposed. Note that the pull-in roller 8, the discharge roller 9, and the white roller 11 are rotationally driven by a motor (not shown).

Further, at the entrance and exit portions of the conveyance path 7, which are spaced a predetermined distance apart in the conveyance direction, first and second electrodes are provided, respectively, for simultaneously detecting the position of one side edge of the document being conveyed within the conveyance path 7.
Detection means 12. 13 are arranged. The first and second detection means 12. Reference numeral 13 has the same structure, as shown in FIG. 15.

The sensor 14 includes a light emitter 16 that emits detection light and a light receiver 17 that receives reflected light from the document. The forward and reverse rotation of the motor 19 is transmitted to the rack 18a of the movable body 18 through the gears 20, 21, and 22, so that the light emitter 16 and the light receiver 17 are used to transport one side edge of the document. It moves left and right within the area, and detects the time when the reflected light received by the light receiver 17 changes the most as one side edge of the document. Specifically, the fifth
As shown in the figure, detection light is emitted from a light emitter 16 made of a light emitting diode, reflected light is received by a light receiver 17 made of a light receiving element, and the detection output of this light receiver 17 is compared using a comparator 23. It is designed to output the results.

The sensor 15 also includes a light emitter 24 that emits detection light on one side of the gear 22, and a light receiver 25 that receives the detection light through a plurality of slits 22a provided in the gear 22 along the circumferential direction. A pulse waveform signal is output from a light receiver 25 which is disposed opposite to each other and receives detection light through a slit 22a as the gear 22 rotates. Specifically, as shown in FIG. 6, a light emitter 24 consisting of a light emitting diode
Detection light is emitted from the light receiving element, the detection light is received through a slit by a light receiver 25 made up of a light receiving element, and the detection output of this light receiver is compared by a comparator 26 to output a waveform signal.

A storage section 32 for storing a roll of thermal recording paper 31 is provided at the front of the body 1.
A thermal head 33 for printing on the recording paper 1 and a platen roller 34 for transporting the recording paper 31 while keeping it in close contact with the thermal head 33 are provided. Note that this platen roller 34 is also driven by a motor (not shown).

FIG. 1 shows a control block diagram, 41 is a CPU, and a bus 42 of this CPU 41 has a ROM 4 for system control.
3 and RAM 44, a communication modem 45 connected to a telephone line, an S-P converter 46 that converts the serial signal from the image sensor 10 into a parallel signal, and a thermal head that converts the parallel signal of received data into a serial signal. P-8 conversion unit 47 outputting to 33, image sensor 1o
a memory 48 for storing image data read by the motor 1;
A motor driver 49, an I10 boat 50, and a counter 51 are connected. Connected to the I10 port 5o are a sensor circuit 52 that outputs the detected value of the sensor 14, and a waveform shaping circuit 53 that shapes the output of the sensor 15 into a pulse waveform and outputs the pulse waveform. Further, the counter 51 counts the pulse signals output from the waveform shaping circuit 53, and can determine the position of one side edge of the document detected by the sensor 14 from this count value.

Further, as shown in FIG. 2, the CPU 41 detects the position of each side edge of the document detected by the first and second detection means 12.13 and the installation distance of the first and second detection means 12.13. The function of the curvature judgment means 61 which judges the degree of curvature of the document in the conveyance direction from
a function of a correction means 62 for correcting the image data of the transmitted document stored in the memory 48 according to the degree of curvature determined in the above;
When it is determined that the width of the document is not approximately constant as a result of detection by the document width detection means 63 (to be described later), the correction means 62
It also has the function of a regulating means 64 that regulates the correction processing by.

Next, the operation of this embodiment will be explained.

When transmitting a document, the document is read and transmission data is accumulated.

First, a document is set on tray 2. At this time, guides (not shown) press the edges of both sides of the document to align the insertion direction.

Then, by inputting a document reading command, the document is pulled into the conveyance path 7 one by one by the pull-in roller 8 and conveyed. The document conveyed through the conveyance path 7 is brought into close contact with the reading surface of an image sensor 10 by a white roller 11, its contents are read by the image sensor 10, and then discharged onto the tray 3 by a discharge roller 9.

Further, the image data of the document read by the image sensor 10 is stored in the memory 48.

In such document reading and data storage operations, document curvature correction processing is performed, and this processing will be explained with reference to the flowchart of FIG.

When the original is drawn into the transport path 7 and transport starts, the first
The detection means 12 starts the detection operation, the sensor 14 detects one side edge of the document (step 1), and the counter 51, which was counting the pulse signal output from the sensor 15 at this time, starts counting. The value A is stored in the RAM 43 (Step 2). Note that this operation continues even while the document is being conveyed, and for example, if the document is bent, the count value A will also change.

When the document reaches the image sensor 10, the image sensor 10 reads the contents of the document and stores the read image data in the memory 48 (step 3).

Next, the second detection means 13 starts the detection operation, and the sensor 14 detects one side edge of the document (step 4), and at this time, the pulse signal output from the sensor 15 is counted. RA the count value B of the counter 51
Store it in M43 (step 5) and judge whether the current counts A and B are almost the same or not, step 6
), if they are exactly the same, it is determined that the manuscript is not bent.

By the way, when loading the original onto the tray 2, the original may be set slightly crooked, or when the original set on the tray 2 is drawn into the transport path 7, there may be slippage between the original and the pull-in roller 8. Due to this, the document is bent and the document is
You may be drawn inside.

In such a case, the counts A and B do not match because the position of one side edge of the document is different between the position of the first detection means 12 and the position of the second detection means 13.

At this time, the function of the bend determination means 61 of the CPU 41 causes the first and second detection means 12. 13 (A-B or B-
A) and the installation distance of the first and second detection means 12°13 to determine the inclination of the original (the degree of curvature of the original with respect to the transport direction)
Calculate (Ste Tsubu 7).

Next, the function of the correction means 62 of the CPU 41 corrects the image data of the transmission document stored in the memory 48 according to the inclination determined by the curvature determination means 61 (step 8).
. This reads the image data from the memory 48, rotates the entire image data by the inclination angle in a direction opposite to the inclination of the document, and re-stores the corrected image data in the memory 4g.

Therefore, the state is the same as when the document is conveyed straight through the conveyance path 7 and read.

At the time of transmission, the image data stored in the memory 48 is transmitted to the other party's facsimile machine. When the other party's facsimile machine prints out the received content on recording paper, the received content is always printed in the correct state on the recording paper, and in particular, the vertical and horizontal lines are less likely to be jagged, making it easier to read. Furthermore, the communication time is shorter than when the image data is sent in a distorted state.

In the above embodiment, the first and second detection means 12.
13 was placed on one side of the document to detect one side edge member, but detection means 12 and 13 having the same structure as the first and second detection means 12 and 13 were placed on both sides of the document to detect the position of both side edges of the document. By detecting the width of the document conveyed within the conveyance path 7, the document width detection means 63 can be configured to detect the width of the document conveyed within the conveyance path 7. - The document width detection means 63 can detect the width of the document and determine whether the document has a constant width or a document with an uneven width.

As a result of the detection by the document width detection means 63, when it is determined that the width of the document is not approximately constant, the CPU 4
The function of the first regulating means 64 makes it possible to cancel the correction processing by the correcting means 62 and prevent the image data from being erroneously corrected.

Further, in the embodiment, the first and second detection means 12.1
However, the image sensor 10 made of CC'D may be substituted as either the first or second detection means 12, 13, which prevents an increase in the number of detection means and reduces the structure. It is possible to simplify the process and reduce costs. In this case, the difference in light output power in the edge region of the image sensor 10 is detected and determined to be the side edge of the document.

〔Effect of the invention〕

According to the invention of claim 1, when the document is conveyed in the conveyance path in a bent state with respect to the conveyance direction, and the image data is stored in the memory after being read by the image sensor, the document is bent in the conveyance direction. By determining the degree of curvature of the document and correcting the image data stored in the memory according to the degree of curvature, it is possible to obtain the same state as when the original is conveyed straight through the conveyance path and read.

According to the invention of claim 2, in the invention of claim 1, when it is determined that the width of the document is not constant, even if it is determined that the document is curved with respect to the transport direction, the document is not stored in the memory. It is possible to prevent image data from being erroneously corrected without performing image data correction processing.

According to the invention of claim 3, in the invention of claim 1, C
, C'D as either the first or second detection means, it is possible to prevent the number of detection means from increasing and to simplify the structure and reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a facsimile machine showing one embodiment of the electronic device of the present invention, Fig. 2 is a block diagram of the CPU function, Fig. 3 is a sectional view of the facsimile machine, and Fig. 4 is a side view of the detection means. , FIG. 5 and FIG. 6 are circuit diagrams of the sensor of the detection means, and FIG. 7 is a flowchart of document hit correction processing.

Claims (3)

[Claims] (1) An image sensor that reads a document being conveyed in a conveyance path; a memory that stores image data of the document read by this image sensor; and an image sensor that is installed in the conveyance path at a predetermined distance in the conveyance direction. first and second detection means for simultaneously detecting the side edge positions of the document being conveyed in the conveyance path; and curvature determining means for determining the degree of curvature of the document in the conveying direction from the installation distances of the first and second detecting means; and correction for correcting the image data stored in the memory according to the degree of curvature determined by the curvature determining means. An electronic device characterized by comprising means. (2) A document width detection means for detecting the width of the document conveyed in the conveyance path, and a correction means performed by the correction means when it is determined that the width of the document is not approximately constant as a result of the detection by the document width detection means. 2. The electronic device according to claim 1, further comprising a regulating means for regulating the electronic device from performing the above. (3) The electronic device according to claim 1, wherein the image sensor is composed of a CCD and is used as either the first or second detection means.