JPH06311319A - Original stationary type reader - Google Patents

Abstract

PURPOSE:To attain highly accurate position control by sticking a position sensing plate with a start position printed thereon onto an original platen glass and using a pattern position detection means to detect the start position. CONSTITUTION:At first a carriage section 10a and a main scanner section 11 are restored to a start position. Then counting of the number of drive pulses of a main scanning motor 12c is started. A main scanning motor 12c is driven forward to read an original. The motor is driven forward till a pulse count reaches a specified count. Then the pulse number is decreased from the specified count value and the motor is reversed till the count value reaches a value (n). Then a start signal is given to a pattern position detection circuit to start detection of a main scanning start position pattern. Then the motor is further reversed and when the main scanning start position detection signal is returned, the motor 12c is stopped at the detection position. In this case, the carriage section 10a is stopped accurately at the start position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed original reading device applicable to a facsimile machine, a copying machine and the like, and more particularly to a fixed original reading device based on an improved reading position control system.

[0002]

2. Description of the Related Art Conventionally, in a fixed original reading apparatus as shown in FIG. 13, a horizontal size plate 8a and a vertical size plate 8b are attached to the surface of a platen glass 3, and a user fits the end faces of the size plate. Sets the original. Then, the reading is started by pressing the start key, and the reading sensor unit scans in the main scanning direction and the sub scanning direction to read the document.

At this time, a stepping motor is used for scanning the reading section, and the position control is stopped when a specified value is reached while counting the number of steps of the stepping motor, and scanning of the next line is performed while counting the number of steps. The method of doing is used.

[0004]

However, in the above-mentioned conventional example, since the moving distance is determined by the number of steps of the stepping motor and the stop position is also controlled, the position error due to the step angle error of the motor or the backlash of the drive system is caused. However, there is a drawback that these errors cannot be dealt with.

Further, in recent years, needs for higher resolution, higher speed, colorization, etc. have increased, and the degree of influence on image deterioration due to these position errors has increased.

Particularly, in the case of a color image, reading is performed with the three primary colors of R, G, and B.
-The three picture elements of B must be read, the size of the read picture element is smaller than that of black and white reading, and the demand for positional deviation is becoming stricter.

Therefore, in view of the above points, it is an object of the present invention to provide a fixed original reading device capable of performing accurate reading position control.

[0008]

Reading position control (1) According to the present invention, in a fixed original reading device, a plate attached to the surface of a platen glass and pre-printed with a pattern for detecting the reading position, and the original reading. And a pattern position detecting means for detecting a reading start position by reading the pattern with a sensor for use.

Reading position control (2) The present invention relates to a fixed original reading device, which comprises a plate attached to the surface of the platen glass and having a pattern for detecting the reading position previously printed thereon, and a reflective sensor for detecting the position. It is provided with means for detecting the position by reading the pattern and compensating the reading position shift by controlling the driving motor.

Reading Position Control (3) The present invention relates to a fixed original reading device, which is attached to the surface of the original platen glass and has a plate for printing a reading position detection pattern preliminarily printed thereon, and the original reading sensor for displaying the pattern. It is provided with a pattern position detecting means for controlling the deceleration of the driving motor by reading and detecting the moving state of the output bit on the sensor to control the reading position shift.

Reading position control (4) The present invention relates to a fixed original reading device, which is attached to the surface of a platen glass and has a pattern on which a reading position detecting pattern is preliminarily printed, and an original reading sensor for reading the pattern. By changing the read bit for the bit position deviation by reading and detecting the moving state of the output bit on the sensor, the drive motor is decelerated and controlled, and by recognizing the output bit position when stopped. so,
And a pattern position detecting means for controlling the deviation of the detection reading position.

[0012]

In accordance with the read position control (1) the present invention, paste the position detection plate on the platen glass surface, by simply adding means for identifying and controlling the printed pattern on the plate, the plate and the document Since the positional relationship of 1 does not change, it is possible to realize extremely highly accurate position control that is not affected by the step angle error of the motor, the backlash of the drive system, and the like.

Reading Position Control (2) According to the present invention, since the position is detected by the reflection type sensor without using the original reading sensor, the pattern position detecting means becomes unnecessary, and the cost control with high precision can be achieved. It can be carried out.

Reading Position Control (3) According to the present invention, the position detecting plate on which the moving position is printed is attached to the platen glass, and the motor is finely adjusted while monitoring the bit position of the detection bit by the pattern position detecting means. Since it is controlled to be accurate, accurate movement position control can be realized.

Reading Position Control (4) According to the present invention, the position detecting plate on which the moving position is printed is attached to the platen glass, and the pattern position detecting means controls while monitoring the bit position of the detection bit,
By changing the start bit of the read signal with respect to the error of the stop position, the position error is offset, so that accurate movement position control can be realized.

[0016]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 shows a fixed original reading unit in which a position detecting plate 9 that best represents the features of one embodiment of the present invention is attached to the surface of the original platen glass 3. FIG. 2 is a configuration diagram of a reading sensor portion formed below the original platen glass 3. FIG. 3 is a perspective view of a fixed original color facsimile apparatus to which the present invention is applied. FIG. 4 is a diagram of a print pattern on the attachment surface side of the position detection plate 9. FIG. 5 is a cross-sectional view showing the configuration of the document reading sensor section in the carriage section.

First, a schematic structure of the entire apparatus will be described with reference to FIG. A document table glass 3 is formed on the upper surface of the apparatus main body 1, and a document pressure plate 2 for holding the document so as not to float is attached above the document table glass 3. Also, the platen glass 3
The operation section 4 is arranged on the same side as the front side, the recording sheet cassette 5 is arranged on the lower side of the front side, and the recording sheet printed by a recording section (not shown) in the main body 1 is arranged on the left side. A recording paper discharge tray 6 for stacking sheets is arranged, and a handset 7 is arranged on the right side surface.

Next, the characteristic portion of the original platen glass 3 will be described with reference to FIG. A horizontal size plate 8a and a vertical size plate 8b are attached to the original platen glass 3 to determine the setting position of the original document. Further, the position detecting plate 9 of the present embodiment is attached to the lateral size plate 8a on the side opposite to the position where the document is placed. At this time, the document reading sensor is set to scan the position detecting plate.

Next, the structure of the reading system and the scanning system of the color facsimile apparatus will be described with reference to FIG. The carriage unit 10a, on which the document reading sensor unit 10b and the light source unit 10c are mounted, is scanned on the main scanner unit 11 in the main scanning direction by being guided by the main scanning rail 12a.
At this time, the main scanning motor 12c and the main scanning timing belt 12b are included in the drive system, and the drive of the main scanning motor 12c is transmitted to the carriage unit 10a via the main scanning timing belt 12b. The carriage is in the A direction (Fig. 2
Main scanning motor 12c during scanning
Is rotating normally and the document is being read.

The main scanner section 11 on which the carriage section 10a is mounted is guided by the sub-scanning rail 13a and scanned in the sub-scanning direction. At this time, the sub-scanning motor 13c and the sub-scanning timing belt 13b are included in the drive system, and the drive of the sub-scanning motor 13c is transmitted to the main scanner unit 11 via the sub-scanning timing belt 13b.
When the main scanner unit 11 is scanning in the B direction (shown in the drawing of FIG. 2), the sub-scanning motor 13c is normally rotated and the main scanner unit is moving.

As the scanning method, the original reading sensor 10 is used.
Pixels b are arranged in the sub-scanning direction, and scanning is performed in the main scanning direction A for reading, and the carriage unit 1 is moved in the direction opposite to the A direction.
0a is returned, and then in the sub-scanning direction B, the main scanner unit 1
1 moves by the number of pixels of the sensor (hereinafter referred to as one band).

This operation is repeated for the size of the original document, and after the reading of one original document is completed, the main scanner section 11 returns to the direction opposite to B and returns to the standby state.

Next, the position detecting plate 9 which is a feature of this embodiment will be described with reference to FIG.

Vertical lines having a width S and a pitch L are arranged in the horizontal direction. This is a positioning pattern 9a in the sub-scanning direction.
Thus, the length of one band and L are printed so as to match.

The width S is set to a width of one pixel size (one pixel size in the case of color reading). Eg 4
When reading at a resolution of 00 DPI, a line width of 63.5 μm is printed. The number of vertical lines is set corresponding to the size of the document.

The horizontal line is a pattern 9b for positioning the start position in the main scanning direction, the length of which is the size of the original document and the line width is
It is set to the width of the pixel size.

The ground of the position detecting plate 9 is white and the color of the pattern is black, and it is attached to the front surface of the original platen glass 3 so that this pattern surface is the back surface.

FIG. 7 shows a sensor waveform when the pattern 9a for positioning in the sub-scanning direction is read by the document reading sensor 10b, and a black line 9a appears at 16.

FIG. 8 shows the sensor waveform when the main scanning direction start position finding pattern 9b is read, and the overall output is low.

FIG. 5 shows the carriage unit 1 as described above.
0a shows the internal configuration of the light source unit 10c, and the light emitted from the light source unit 10c hits the document, and the reflected light is condensed and read by the lens 14a (here, a cylindrical lens), and the sensor substrate 14b is read.
It is arranged to form an image on the sensor surface of.

FIG. 6 shows the configuration of a position detecting circuit which is another feature of this embodiment. Here, a signal processing block for color reading is shown.

As described above, the R, G, and B pixels are arranged in one line in the sub-scanning direction on the color sensor 15a.
R, G, and B are output independently from the sensor. The output signal is amplified by the amplifier circuit 15b and converted from an analog signal to a digital signal by the A / D conversion circuit 15c. The converted digital signal is waveform-shaped by the shading correction circuit 15d and the variation between pixels is corrected. The corrected signal is stored and held in each of the R, G, B line memories 15e. A pattern position detection circuit 15f is connected to the line memory 15e.

This pattern position detection circuit 15f is
The operation is started in response to the start signal from U, the data in the line memory 15e is searched, the sub-scanning pattern position detection bit 16 on the waveform shown in FIG. 7, for example, is detected, and the address of that bit is used as a control signal. Return to CPU.

Further, as shown in FIG. 8, when the overall output becomes low and the main scanning start position pattern 9b is detected,
A control signal for detecting the main scanning start position is returned to the CPU.

Furthermore, the start bit position of the signal output from the line memory 15e to the image processing can be controlled by the address control signal from the pattern position detection circuit 15f.

Next, the control method for each reading position control will be described in detail with reference to the flow charts shown in FIGS. 10, 11 and 12.

FIG. 10 is a flow chart for controlling the start position by reading the position detecting plate 9 with the document reading sensor 10b (reading position control (1)).

First, step S1 (hereinafter, "step")
Is omitted), the carriage unit 10a and the main scanner unit 11 are returned to the start position. In S2, counting of the number of drive pulses of the main scanning motor 12c is started.
The driving of the main scanning motor is started, and the main scanning motor is rotated in the normal direction in S3 to read the document. The number of pulses is counted up in S4 for each drive pulse, and in S5, the pulse is normally rotated until the pulse count value reaches a specified value.

The specified value is a count value at the position where the reading sensor 10b reaches the end surface of the document. Here, reading for one band is completed, and then the main scanning motor is reversely rotated in S6 to return the carriage portion 10a to the start position.

In S6, the number of pulses is counted down from the previously specified value, and the reverse rotation is continued until the count value reaches the n value in S8. Here, the n value means that the carriage unit 10a is at the position of n lines up to the start position.

In S9, the CPU issues a start signal to the pattern position detection circuit 15f to start the main scanning start position pattern detection. The reverse rotation is further performed in S10, and the reverse rotation is performed until the pattern position detection circuit 15f returns the main scanning start position detection signal to the CPU in S11. The reverse rotation at this time is different from the reverse rotation at S6, and at low speed,
The step angle is controlled to be small.

When the main scanning start position detection signal is returned, the main scanning motor 12c is stopped in S12, and the main scanning motor 12c is stopped at that detection position. At this time, since the step angle is made small and fine control is performed, the carriage unit 10a can be stopped at the correct start position.

FIG. 9 is a perspective view in which the position detecting reflection type sensor 17a and the reflection type sensor light shielding plate 17b are attached to the carriage portion 10a. In this case (reading position control (2)), the pattern position detection circuit 15f described above is unnecessary, and steps S9 and S11 shown in FIG. 10 are omitted and start position detection is performed.

FIG. 11 shows the position detecting plate 9 and the pattern position detecting circuit 15 regarding the moving position in the sub-scanning direction.
Sub-scanning motor 13 while monitoring the bit position using f
It is a flowchart which controls c and performs accurate position control (reading position control (3)).

First, in S101, the pattern position detection circuit 1
For 5f, the CPU issues a start signal to detect the sub-scanning pattern detection bit 16.

In step S102, the sub-scanning motor 13c is normally rotated,
The sub-scanning movement of the main scanner 11 is performed. With the forward rotation of the sub-scanning motor, the sub-scanning pattern detection bit 16 approaches the start bit on the sensor waveform shown in FIG.

In S103, the sub-scanning pattern detection bit 16
When it is determined that the difference between the start bit and the start bit becomes m bits, the sub-scanning motor 13c is decelerated in S104, and the control is changed so that the step angle is also reduced. Where the difference is m
The position of bit means that the position is a few bits closer to the start bit.

When the start bit and the sub-scanning pattern detection bit 16 match in S105, the pattern position detection circuit 1
When 5f judges, it returns a control signal to the CPU, and S10
At 6, the sub-scanning motor 13c is stopped. At this time, since the step angle is made small and fine control is performed, the main scanner 11 accurately moves to the next band position,
You can stop.

FIG. 12 shows the position detecting plate 9 and the pattern position detecting circuit 15 regarding the moving position in the sub-scanning direction.
Sub-scanning motor 13 while monitoring the bit position using f
c, and when the sub-scanning pattern detection bit 16 is near the start bit, the sub-scanning motor 13c is stopped,
15 is a flowchart for performing accurate position control by changing the start bit to the sub-scanning pattern detection bit 16 by the pattern position detection circuit 15f (reading position control (4)).

At this time, the reading bit number of the document reading sensor 15a is set to be larger than the bit number for one band by several bits. In the control of the flowchart here, the setting is m bits larger than one band.

First, in S201, the pattern position detection circuit 1
For 5f, the CPU issues a start signal to detect the sub-scanning pattern detection bit 16. In step S202, the sub-scanning motor 13c is rotated in the normal direction to move the main scanner 11 in the sub-scanning direction.

With the forward rotation of the sub-scanning motor, the sub-scanning pattern detection bit 16 approaches the start bit on the sensor waveform shown in FIG.

In S203, the sub-scanning pattern detection bit 16
When it is determined that the difference between the start bit and the start bit is ± m bits, the sub-scanning motor 13c is stopped in S204. Here, the position where the difference is m bits means an error position of several bits with respect to the start bit.

The pattern position detection circuit 15f determines the address position of the sub-scanning pattern detection bit 16 when stopped in S205, and the start bit position of the line memory 15e is set to the address position of the sub-scanning pattern detection bit 16 by the address control signal. change.

By doing so, the m-bit position error is canceled out, and it is possible to realize the accurate reading at the next band position without shifting even one pixel.

Other Embodiments In the above-described embodiments, the fixed document reading sensor scans both the main scanning direction and the sub-scanning direction, but the fixed document reading device using the line reading sensor is described. With respect to the above, accurate sub-scanning position control can be realized by monitoring the bit output for detecting the sub-scanning pattern in the position control in the sub-scanning direction.

[0058]

By implementing the present invention, the effects listed below can be obtained.

Reading Position Control (1) As described above, according to the present invention, the position detecting plate on which the start position is printed is attached to the platen glass, and the start position is detected by the pattern position detecting means. As a result, highly accurate position control can be performed without being affected by errors such as a step angle error of the motor and backlash of the drive system.

Reading Position Control (2) According to the present invention, the position detection is performed by the reflection type sensor without using the original reading sensor, so that the pattern position detecting means is not required, and the cost control with high precision can be achieved. It can be carried out.

Reading Position Control (3) According to the present invention, the position detecting plate on which the moving position is printed is attached to the platen glass, and the motor is finely adjusted while the bit position of the detection bit is monitored by the pattern position detecting means. Since it is controlled to be accurate, accurate movement position control can be realized.

Reading position control (4) According to the present invention, the position detecting plate on which the moving position is printed is attached to the platen glass, and the bit position of the detection bit is controlled while being monitored by the pattern position detecting means.
By changing the start bit of the read signal with respect to the error of the stop position, the position error is offset, so that accurate movement position control can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a fixed original reading unit to which the present invention is applied.

FIG. 2 is a configuration diagram of a reading unit according to an embodiment of the present invention.

FIG. 3 is an external perspective view of the entire fixed-type original color facsimile apparatus.

FIG. 4 is a diagram showing a printing surface (sticking surface) of a position detecting plate stuck to a platen glass.

FIG. 5 is a cross-sectional view of a document reading sensor unit in the carriage unit.

FIG. 6 is a block diagram showing a sensor output signal processing unit according to an embodiment of the present invention.

FIG. 7 is a diagram showing a sensor output waveform when a sub-scanning position setting pattern of the position detection plate is read.

FIG. 8 is a diagram showing a sensor output waveform when a main scanning position setting pattern of the position detection plate is read.

FIG. 9 is a perspective view of a position detection sensor to which the present invention is applied.

FIG. 10 is a flowchart showing a control procedure when reading position control (1) is executed.

FIG. 11 is a flowchart showing a control procedure when reading position control (3) is executed.

FIG. 12 is a flowchart showing a control procedure when reading position control (4) is executed.

FIG. 13 is a view showing a conventional fixed original reading unit.

[Explanation of symbols]

 1 Entire device 2 Original press plate 3 Original plate glass 4 Operation part 5 Recording paper cassette 6 Recording paper output tray 7 Handset 8a Horizontal size plate 8b Vertical size plate 9 Position detection plate 9a Positioning pattern in the sub-scanning direction 9b Main Scanning direction start position setting pattern 10a Carriage part 10b Sensor part 10c Light source part 11 Main scanner part 12a Main scanning rail 12b Main scanning timing belt 12c Main scanning motor 13a Sub scanning rail 13b Sub scanning timing belt 13c Sub scanning motor 14a Lens 14b Reading Sensor substrate 14c Light-shielding plate 15a Color sensor 15b Sensor signal amplifier circuit 15c A / D conversion circuit 15d Shading correction circuit 15e R. G. B line memory 15f Pattern position detection circuit 16 Sub-scanning pattern detection bit 17a Position detection reflective sensor 17b Reflective sensor light shield plate

Claims (4)

[Claims] 1. A fixed document reading device, which detects a reading start position by reading the pattern with a plate attached on the surface of a platen glass and pre-printed with a pattern for detecting a reading position, and a document reading sensor. A fixed original reading device, comprising: 2. In a fixed original reading device, a plate attached to the surface of the original platen glass and pre-printed with a pattern for detecting the reading position, and a position detecting reflective sensor for reading the pattern to thereby determine the position. A fixed original reading device comprising a means for detecting and controlling a driving motor to compensate for a reading position shift. 3. In a fixed original reading device, a plate attached to the surface of the original platen glass and pre-printed with a pattern for detecting a reading position; and a plate for reading the pattern by a document reading sensor, and an output bit on the sensor. And a pattern position detecting means for controlling deceleration of the driving motor by detecting the moving state of the fixed document reading device, and a fixed original reading device. 4. In a fixed original reading device, a plate attached to the surface of the original platen glass and pre-printed with a pattern for detecting a reading position; and a plate for reading the pattern by a document reading sensor, and an output bit on the sensor. The driving motor is decelerated by detecting the moving state of the drive, and by recognizing the output bit position when stopped, the read bit is changed with respect to the bit position shift, thereby controlling the detection read position shift. A fixed original reading device, comprising: