JP2000032190A - Image processor, modulation width monitoring method and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processor, a modulation width monitoring method and a storage medium capable of reducing designer's and engineer's load and capable of inexpensively and easily reducing electromagnetic radiation. SOLUTION: The image processor includes a crystal oscillator for generating a clock a frequency modulation means for modulating the frequency of the clock, an image processing part 111 for executing image processing synchronously with a modulated clock, a phase comparator for mutually comparing the output of the crystal oscillator with that of the frequency modulation means, a filter for integrating the output of the phase comparator, a modulation width monitoring means 108 provided with a comparator for outputting a modulation width detection signal to a CPU 101 when the output of the filter is less than the minimum value of reference voltage or exceeds its maximum value, and the CPU 101 for displaying warning on a display means of an operation panel 106 based on the input of the modulation width detection signal, turning off a relay circuit 107 and controlling a power supply for the processor so as to cut the power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus, a modulation width monitoring method, and a storage medium, and more particularly, to an image processing apparatus and a modulation width monitoring method suitable for application to, for example, a digital copying machine or a scanner. The present invention relates to a method and a storage medium.

[0002]

2. Description of the Related Art Conventionally, there are image processing apparatuses such as digital copiers and scanners for reading an image from a document on a document table and performing predetermined image processing. In a conventional image processing apparatus, image processing is performed in synchronization with a fixed frequency clock output from a clock generator such as a crystal oscillator.

[0003]

However, the above-mentioned prior art has the following problems. That is, with the advancement of image processing technology, higher speed and higher resolution have progressed, and as a result, the frequency of the clock used for the image processing means of the image processing apparatus has been increasing. As a result, in the above-described conventional technology, electromagnetic interference (EMI: Electro Magnetic) adopted worldwide is used.
There is a problem that a burden is placed on designers and engineers in order to satisfy the standards of Interference. In addition, there is a problem that a great burden is imposed on costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides an image processing apparatus capable of reducing the burden on designers and technicians, reducing costs, and easily reducing electromagnetic radiation.
It is an object to provide a modulation width monitoring method and a storage medium.

[0005]

According to the present invention, there is provided an image processing apparatus for reading an image from an original and performing image processing based on a clock, wherein the clock is generated. It is characterized by comprising clock generation means, frequency modulation means for modulating the frequency of the generated clock, and modulation width monitoring means for monitoring the modulation width of the modulated clock.

In order to achieve the above object, the present invention according to claim 2 has image processing means for performing image processing in synchronization with a clock modulated by the frequency modulation means, and the modulation width monitoring means comprises: The modulation width of the clock is monitored based on a comparison result between the output of the clock generation means and the output of the frequency modulation means.

According to a third aspect of the present invention, the modulation width monitoring means includes a comparing means for comparing an output of the clock generating means with an output of the frequency modulation means. Detecting means for outputting a modulation width detection signal indicating that the modulation width has deviated from the reference range when the output of the means is less than the reference minimum value or exceeding the reference maximum value.

According to a fourth aspect of the present invention, there is provided a power supply control means for shutting off a power supply of an image processing apparatus main body when the modulation width monitoring means detects a deviation from a reference range of the modulation width. It is characterized by having.

In order to achieve the above object, the present invention according to claim 5 is characterized in that when the modulation width monitoring means detects a deviation of the modulation width from a reference range, it has a warning control means for giving a warning to that effect. And

In order to achieve the above object, according to the present invention, when the modulation width monitoring means detects the deviation of the modulation width from a reference range, the warning control means displays the fact by a display means. It is characterized by making it.

In order to achieve the above object, according to a seventh aspect of the present invention, when the modulation width monitoring means detects a deviation of a modulation width from a reference range, the warning control means can give an audio warning to that effect. It is characterized by being.

In order to achieve the above object, the present invention is characterized in that the present invention is applicable to a copying machine and a scanner.

According to a ninth aspect of the present invention, there is provided a modulation width monitoring method applied to an image processing apparatus for reading an image from a document and performing image processing based on a clock, comprising the steps of: The method includes a clock generation step to be generated, a frequency modulation step to modulate the frequency of the generated clock, and a modulation width monitoring step to monitor a modulation width of the modulated clock.

To achieve the above object, the present invention according to claim 10 has an image processing step of performing image processing in synchronization with a clock modulated in the frequency modulation step, and the modulation width monitoring step includes: The modulation width of the clock is monitored based on a comparison result between the output of the clock generation step and the output of the frequency modulation step.

In order to achieve the above object, the present invention as set forth in claim 11, wherein the modulation width monitoring step includes a comparison step of comparing an output of the clock generation step with an output of the frequency modulation step. A detection signal output step of outputting a modulation width detection signal indicating that the modulation width has deviated from the reference range when the output of the step is less than the reference minimum value or exceeds the reference maximum value.

In order to achieve the above object, the present invention according to a twelfth aspect of the present invention provides a power control step for turning off the power of the image processing apparatus main body when the modulation width monitoring step detects a deviation of the reference range of the modulation width. It is characterized by having.

In order to achieve the above object, the present invention according to a thirteenth aspect of the present invention is characterized in that when the modulation width monitoring step detects a deviation of the modulation width from a reference range, a warning control step is provided to warn the deviation. And

In order to achieve the above object, according to the present invention, in the warning control step, when the modulation width monitoring step detects a deviation of the modulation width from a reference range, the warning is displayed by a display means. It is characterized by making it.

In order to achieve the above object, according to the present invention, in the warning control step, when the modulation width monitoring step detects a deviation of a modulation width from a reference range, the warning can be issued by voice. It is characterized by being.

To achieve the above object, the present invention is characterized in that the present invention is applicable to a copying machine and a scanner.

In order to achieve the above object, the present invention according to claim 17 stores a program for executing a modulation width monitoring method applied to an image processing apparatus which reads an image from a document and performs image processing based on a clock. A computer readable storage medium, wherein the modulation width monitoring method monitors a clock generation step of generating a clock, a frequency modulation step of modulating a frequency of the generated clock, and a modulation width of the modulated clock. And a modulation width monitoring step.

[0022]

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

FIG. 1 is a block diagram showing a configuration of an image processing apparatus according to an embodiment of the present invention. An image processing apparatus according to an embodiment of the present invention includes a CPU 101, a bus driver circuit / address decoder circuit 102, a read-only memory (ROM) 103, a main storage device (RAM) 104,
/ O interface 105, operation panel 106, relay circuit 107, modulation width monitoring means 108, laser unit 1
09, CCD (Charge Coupled Devi)
ce) Unit 110, image processing unit 111, and video bus 112 are provided.

The configuration of each of the above components will be described in detail.
Reference numeral 1 denotes a central processing unit that controls the entire image processing apparatus. The central processing unit 1 sequentially reads a control program from a read-only memory (ROM) 103 and executes a process shown in a flowchart of FIG. The bus driver circuit / address decoder circuit 102 connects an address bus and a data bus of the CPU 101 to each load. The read-only memory (ROM) 103 stores a control procedure (control program) for the image processing apparatus main body. Main storage (RAM) 10
Reference numeral 4 denotes a random access memory used as storage for input data, a work storage area, and the like. The I / O interface 105 includes an operation panel 106, motors for driving a paper feeding system, a conveyance system, and an optical system, clutches, solenoids, and paper detection sensors for detecting a conveyed sheet. Device (not shown), relay circuit 107,
The modulation width monitoring means 108 is connected to each load of the laser unit 109.

The operation panel 106 includes various keys for the operator to make key inputs, and a display unit such as a liquid crystal display or an LED for displaying the status of the image processing apparatus. The relay circuit 107 switches on / off the power of the image processing apparatus. The modulation width monitoring means 108 monitors the modulation width of the modulated clock as described later. CCD unit 1
Reference numeral 10 reads the image data of the document placed on the document table and outputs it to the image processing unit 111 via the video bus 112. The image processing unit 111 performs image processing described below on image data output from the CCD unit 110.
The video bus 112 connects the CCD unit 110 and the image processing unit 111. The laser unit 109 forms an image on a sheet based on image data output from the image processing unit 111. The modulation width monitoring means 108 and the CCD unit 110 will be described in detail with reference to FIG.

FIG. 2 is a block diagram showing a configuration centering on the image processing unit 111 of the image processing apparatus according to the embodiment of the present invention. The image processing unit 111 of the image processing device according to the embodiment of the present invention includes a shading circuit 203, a scaling circuit 204, an edge enhancement circuit 205, and a γ conversion circuit 20.
6, a binarization processing unit 207, a combining circuit 208, a memory control unit 209, an image memory 210, a PWM (Pulse
The configuration includes a Width Modulation (pulse width modulation) circuit 211. In the figure, 201 indicates a crystal oscillator, and 202 indicates a frequency modulation means.

The configuration of each of the above-mentioned units together with the operation will be described in detail.
The crystal oscillator 201 outputs a clock having a fixed frequency. The frequency modulator 202 receives the clock output from the crystal oscillator 201 and outputs a clock obtained by modulating the frequency of the input clock. This frequency modulation will be described later in detail. The modulation width monitoring unit 108 receives the clock output from the crystal oscillator 201 and the clock output from the frequency modulation unit 202, and detects a modulation width of the input clock from a reference value. Is output.

The CCD unit 110 includes an image forming lens for forming an image of reflected light from a document, an image pickup device composed of a CCD, and a CCD driver (not shown in the drawings) for driving the image pickup device with the output clock of the frequency modulation means 202 described above. The image signal output from the image sensor is converted into, for example, 8-bit digital data, and input to the shading circuit 203 of the image processing unit 111 as an image data signal synchronized with the modulation clock.

The image data signal input to the image processing unit 111 is corrected for variations between pixels by the shading circuit 203, and then, in the scaling circuit 204, the data is thinned out at the time of reduced copy, and is reduced at the time of enlarged copy. Performs data interpolation. Next, in the edge emphasizing circuit 205, second differentiation is performed in, for example, a 5.times.5 window to emphasize the edges of the image. Since this image data is luminance data, the γ conversion circuit 206 performs data conversion by table search in order to convert the image data into density data to be output to the laser unit 109 (printer). The image data converted to the density data is input to the binarization processing unit 207. Here, multivalued data is converted to binary data by, for example, the ED method (error diffusion method). The binary converted image data is input to the synthesizing circuit 208.

The synthesizing circuit 208 selectively outputs the input image data and the image data in the image memory 210 composed of, for example, a DRAM or a hard disk. The read / write control for the image memory 210 is performed by the memory control unit 209. When the image is rotated, the read address of the image data in the image memory 210 is controlled. These image data are input to the PWM circuit 211 to convert them into a signal of the emission intensity of the laser light, and a pulse width according to the density of the image is output to the laser unit 109. Note that the above-described series of image processing is all performed in synchronization with the modulation clock.

Next, the frequency modulation means 202 and the modulation width monitoring means 108 of the image processing apparatus according to the embodiment of the present invention.
Will be described in detail. Frequency modulation is a patented technology that applies narrow-band modulation to a clock having a fixed oscillation frequency to reduce the electromagnetic radiation intensity of the fixed oscillation frequency. For example, USP 5,488,627, US Pat.
P5631920.

FIG. 3 is a circuit diagram showing a configuration of the modulation width monitoring means 108 of the image processing apparatus according to the embodiment of the present invention. The modulation width monitoring means 108 includes a phase comparator 301 constituted by, for example, an EX-OR circuit, a filter 302 constituted by, for example, a resistor R and a capacitor C, a comparator 306, and a comparator 307. The phase comparator 301 compares the output of the crystal oscillator 201 with the output of the frequency modulation means 202. The filter 302 integrates the output of the phase comparator 301. Comparator 306
Compares the output of the filter 302 with the minimum value of the reference voltage, and outputs the modulation width detection signal 1 to the I / O interface 105 based on the comparison result. The comparator 307 compares the output of the filter 302 with the maximum value of the reference voltage, and outputs the modulation width detection signal 2 to the I / O interface 105 based on the comparison result. 4A shows the output of the crystal oscillator 201, FIG. 4B shows the output of the frequency modulation means 202,
(C) is the output of the phase comparator 301, (d) is the filter 3
02 shows the output.

In this case, the correspondence between the components of the image processing apparatus according to the embodiment of the present invention described above and the components in the claims is as follows. The modulation width monitoring means 108 corresponds to the modulation width monitoring means, and the modulation width monitoring means 1
08, a phase comparator 301 corresponds to a comparing unit, comparators 306 and 307 of the modulation width monitoring unit 108 correspond to a detection signal output unit, an image processing unit 111 corresponds to an image processing unit, and the CPU 101 and the relay circuit 107 Corresponding to power control means, the CPU 101 corresponds to warning control means,
The operation panel 106 corresponds to a display unit, and
Numeral 1 corresponds to a clock generation means, and a frequency modulation means 202
Corresponds to frequency modulation means.

Next, the operation of monitoring the modulation width of the image processing apparatus according to the embodiment of the present invention configured as described above will be described with reference to FIG.
4 and 5 will be described.

The clock output from the crystal oscillator 201 (FIG. 4A) and the clock output from the frequency modulation means 202 (FIG. 4B) are input to the phase comparator 301 of the modulation width monitoring means 108. Is done. Now, FIG. 4 (a), FIG.
When the waveform shown in (b) is an input signal (the output of the crystal oscillator 201 and the output of the frequency modulation means 202) as shown in FIG. 3, the output of the phase comparator 301 is as shown in FIG. The output of the phase comparator 301 is integrated by the filter 302 to become a signal as shown by the solid line in FIG. Assume that the voltage level of the signal shown in FIG. That is, as the modulation width increases, the potential level of V1 increases, and as the modulation width decreases, the potential level of V1 decreases.

The potential level 304 corresponding to the minimum value of the modulation width allowed by the image processing device is VREF1, the potential level 305 corresponding to the maximum value of the modulation width allowed by the image processing device is VREF2, and the comparator 306 sets VREF1 and V1. And the comparator 307 compares the
The voltage levels of REF2 and V1 are compared. VREF1> V
1, when VREF2 <V1, the modulation width detection signals 1 and 2 become high level and are input to the CPU 101 via the I / O interface 105.

FIG. 5 is a flowchart relating to control when the deviation from the reference range of the modulation width is detected in the image processing apparatus according to the embodiment of the present invention. For CPU 101,
When a high-level modulation width detection signal is input from the frequency modulation stop detection unit 108 via the I / O interface 105 (step S501), the CPU 101 causes a display unit (for example, liquid crystal) (not shown) on the operation panel 106 to display a signal. A warning is displayed (step S502). Further, the CPU 101
Backs up the contents of the error in the RAM 104 (step S503), turns off the relay circuit 107 via the I / O interface 105 (step S504),
Turn off the power of the image processing apparatus.

As described above, according to the image processing apparatus of the embodiment of the present invention, the crystal oscillator 201 for generating the clock and the frequency modulation means 202 for modulating the frequency of the clock output from the crystal oscillator 201 And an image processing unit 111 that performs image processing in synchronization with a clock modulated by the frequency modulation unit 202, a phase comparator 301 that compares the output of the crystal oscillator 201 with the output of the frequency modulation unit 202, Filter 3 for integrating output
02, the output of the filter 302 is the reference voltage VREF
A modulation width monitor 108 including a comparator 306 that outputs a modulation width detection signal 1 to the CPU 101 when the value is less than 1, and a comparator 307 that outputs a modulation width detection signal 2 to the CPU 101 when the output of the filter 302 exceeds the reference voltage VREF2. And a CPU 101 for displaying a warning on the display unit on the operation panel 106 based on the input of the modulation width detection signal, and controlling to turn off the relay circuit 107 and turn off the power of the image processing apparatus. Function and effect.

In the above configuration, the modulation width monitoring means 108
The phase comparator 301 compares the outputs of the crystal oscillator 201 and the frequency modulation means 202 and inputs an output based on the comparison result to the filter 302. The filter 302 integrates the output of the phase comparator 301 and compares the outputs of the comparators 306 and 30.
7, the comparator 306 sets the filter 302
Output the modulation width detection signal 1 to the CPU 101 when the output of the comparator 30 is lower than the reference voltage VREF1.
7, the output of the filter 302 is the reference voltage VREF2
If it exceeds, a modulation width detection signal 2 is output to the CPU 101. When the modulation width detection signal is input, the CPU 101 displays a warning on the display unit on the operation panel 106, turns off the relay circuit 107, and turns off the power of the image processing apparatus.

Therefore, in the embodiment of the present invention,
As compared with the related art, there is an effect that it is possible to provide an image processing apparatus that can reduce the burden on designers and technicians, is low-cost, and can easily reduce electromagnetic radiation.

In the above-described image processing apparatus according to the embodiment of the present invention, when the modulation width monitoring means 108 detects that the modulation width of the input clock has deviated from the reference range, the CPU 101 displays the image on the operation panel 106. Although it was configured to display a warning by the unit, but is not limited to this, for example, equipped with audio output means in the image processing device,
It is also possible to adopt a configuration in which the CPU 101 outputs a warning sound by the sound output means.

The present invention may be applied to a system composed of a plurality of devices or 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.

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

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS or the like running on the computer is 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.

[0047]

As described above, according to the image processing apparatus of the present invention, an image processing apparatus that reads an image from a document and performs image processing based on a clock, and generates a clock. The following effects are provided by the provision of the clock generation means, the frequency modulation means for modulating the frequency of the generated clock, and the modulation width monitoring means for monitoring the modulation width of the modulated clock. By monitoring the modulation width of a modulated clock in an image processing apparatus that performs image processing based on a clock, the burden on designers and engineers is reduced, and electromagnetic radiation is easily reduced at a low cost, as compared with the related art. There is an effect that it is possible to provide an image processing apparatus capable of performing the above.

According to the image processing apparatus of the present invention, there is provided image processing means for performing image processing in synchronization with the clock modulated by the frequency modulation means, and the modulation width monitoring means is provided with the clock width control means. Since the modulation width of the clock is monitored based on the result of comparison between the output of the generation means and the output of the frequency modulation means, the following effects are obtained. In an image processing apparatus that performs image processing based on a clock, by monitoring a modulation width of a clock based on a comparison result between an output of a clock generation unit and an output of a frequency modulation unit, compared with a conventional one,
There is an effect that it is possible to provide an image processing apparatus that can reduce the burden on designers and technicians and that can easily reduce electromagnetic radiation at low cost.

According to the image processing apparatus of the present invention, the modulation width monitoring means compares the output of the clock generation means with the output of the frequency modulation means, If the output is less than the reference minimum value or exceeds the reference maximum value, the detection signal output means for outputting a modulation width detection signal indicating that the modulation width deviates from the reference range has the following effects. In an image processing apparatus that performs image processing based on a clock, an output of a clock generation unit is compared with an output of a frequency modulation unit, and a modulation width detection signal is output if the comparison output is less than a reference minimum value or exceeds a reference maximum value. As a result, there is an effect that an image processing apparatus that can reduce the burden on designers and technicians as well as reduce costs and easily reduce electromagnetic radiation as compared with the related art can be provided.

According to the image processing apparatus of the present invention, since the modulation width monitoring means detects the deviation of the modulation width from the reference range, the power supply control means for turning off the power of the image processing apparatus main body is provided. The following effects are obtained. In an image processing apparatus that performs image processing based on a clock, when a deviation from a reference range of a modulation width is detected, a power supply of the image processing apparatus is turned off, thereby reducing a burden on a designer and a technician as compared with the related art. There is an effect that it is possible to provide an image processing apparatus that can reduce electromagnetic radiation easily at low cost.

According to the image processing apparatus of the present invention, when the modulation width monitoring means detects a deviation of the reference range of the modulation width, it has a warning control means for giving a warning to that effect. Effect. In an image processing device that performs image processing based on a clock, when a deviation from the reference range of the modulation width is detected, a warning to that effect is issued, so that the burden on designers and engineers is reduced and the cost is reduced compared to the past. Further, there is an effect that an image processing apparatus capable of easily reducing electromagnetic radiation can be provided.

According to the image processing apparatus of the present invention, when the modulation width monitoring means detects the deviation of the modulation width from the reference range, the warning control means displays the fact on the display means. The following effects are obtained. In an image processing apparatus that performs image processing based on a clock, a warning is displayed on a display unit when a deviation from a reference range of a modulation width is detected, thereby reducing the burden on designers and technicians and lowering costs compared to the past. And an image processing apparatus capable of easily reducing electromagnetic radiation.

According to the image processing apparatus of the present invention, when the modulation width monitoring means detects the deviation of the modulation width from the reference range, the warning control means can give an audio warning to that effect. Therefore, the following effects are obtained. In an image processing device that performs image processing based on a clock, when a deviation from the reference range of the modulation width is detected, a warning can be issued by voice, so that the burden on designers and engineers is reduced and the cost is reduced compared to the past. And an image processing apparatus capable of easily reducing electromagnetic radiation.

According to the image processing apparatus of the present invention, since it can be applied to a copying machine and a scanner, the following effects can be obtained. In copiers and scanners that perform image processing based on clocks, monitoring the modulation width of the modulated clock reduces the burden on designers and technicians compared to the past, and reduces the cost of electromagnetic radiation easily. There is an effect that it is possible to provide an image processing apparatus capable of reducing the number of images.

According to a ninth aspect of the present invention, there is provided a modulation width monitoring method applied to an image processing apparatus for reading an image from a document and performing image processing based on a clock, wherein the clock is generated. Since the method includes the step of generating a clock, the step of modulating the frequency of the generated clock, and the step of monitoring the modulation width of the modulated clock, the following effects are obtained. By monitoring the modulation width of a modulated clock in an image processing apparatus that performs image processing based on a clock, the burden on designers and engineers is reduced, and electromagnetic radiation is easily reduced at a low cost, as compared with the related art. There is an effect that it is possible to provide an image processing apparatus capable of performing the above.

According to the modulation width monitoring method of the present invention, there is provided an image processing step of performing image processing in synchronization with the clock modulated in the frequency modulation step. Since the modulation width of the clock is monitored based on the result of comparison between the output of the clock generation step and the output of the frequency modulation step, the following effects are obtained. In an image processing apparatus that performs image processing based on a clock, by monitoring the modulation width of the clock based on the comparison result between the output of the clock generation step and the output of the frequency modulation step, it is possible for designers and engineers to There is an effect that it is possible to provide an image processing apparatus which can reduce the burden and can easily reduce the electromagnetic radiation at low cost.

According to the modulation width monitoring method of the present invention, the modulation width monitoring step includes a comparison step of comparing an output of the clock generation step with an output of the frequency modulation step, and the comparison step. If the output is less than the reference minimum value or exceeds the reference maximum value, a detection signal output step of outputting a modulation width detection signal indicating that the modulation width has deviated from the reference range has the following effects. In an image processing apparatus that performs image processing based on a clock, an output of a clock generation step is compared with an output of a frequency modulation step, and a modulation width detection signal is output when the comparison output is less than a reference minimum value or exceeds a reference maximum value. As a result, there is an effect that an image processing apparatus that can reduce the burden on designers and technicians as well as reduce costs and easily reduce electromagnetic radiation as compared with the related art can be provided.

According to the modulation width monitoring method of the present invention, there is provided a power supply control step of turning off the power of the image processing apparatus main body when the modulation width monitoring step detects a deviation from the reference range of the modulation width. Therefore, the following effects are obtained. In an image processing apparatus that performs image processing based on a clock, when a deviation from a reference range of a modulation width is detected, a power supply of the image processing apparatus is turned off, thereby reducing a burden on a designer and a technician as compared with the related art. There is an effect that it is possible to provide an image processing apparatus that can reduce electromagnetic radiation easily at low cost.

According to the modulation width monitoring method of the present invention, when the modulation width monitoring step detects a deviation from the reference range of the modulation width, it includes a warning control step for warning the fact that the deviation is outside the reference range. It has the following effects. In an image processing device that performs image processing based on a clock, when a deviation from the reference range of the modulation width is detected, a warning to that effect is issued, so that the burden on designers and engineers is reduced and the cost is reduced compared to the past. Further, there is an effect that an image processing apparatus capable of easily reducing electromagnetic radiation can be provided.

According to the modulation width monitoring method of the present invention, in the warning control step, when the modulation width monitoring step detects a deviation of the modulation width from the reference range, the display means displays the fact. Therefore, the following effects are obtained. In an image processing apparatus that performs image processing based on a clock, a warning is displayed on a display unit when a deviation from a reference range of a modulation width is detected, thereby reducing the burden on designers and technicians and lowering costs compared to the past. And an image processing apparatus capable of easily reducing electromagnetic radiation.

According to the modulation width monitoring method of the present invention, in the warning control step, when the modulation width monitoring step detects a deviation of the modulation width from the reference range, the warning can be sounded. Therefore, the following effects are obtained. In an image processing device that performs image processing based on a clock, when a deviation from the reference range of the modulation width is detected, a warning can be issued by voice, so that the burden on designers and engineers is reduced and the cost is reduced compared to the past. And an image processing apparatus capable of easily reducing electromagnetic radiation.

According to the modulation width monitoring method of the present invention, it is possible to apply the present invention to a copying machine and a scanner. In copiers and scanners that perform image processing based on clocks, monitoring the modulation width of the modulated clock reduces the burden on designers and technicians compared to the past, and reduces the cost of electromagnetic radiation easily. There is an effect that it is possible to provide an image processing apparatus capable of reducing the number of images.

According to the storage medium of the present invention, a computer that stores a program for executing a modulation width monitoring method applied to an image processing apparatus that reads an image from a document and performs image processing based on a clock is provided. A readable storage medium, wherein the modulation width monitoring method includes a clock generation step of generating a clock, a frequency modulation step of modulating a frequency of the generated clock, and a modulation width monitoring of monitoring a modulation width of the modulated clock. With the steps, the following effects are obtained. By monitoring the modulation width of a modulated clock in an image processing apparatus that performs image processing based on a clock, the burden on designers and engineers is reduced, and electromagnetic radiation is easily reduced at a low cost, as compared with the related art. There is an effect that it is possible to provide an image processing apparatus capable of performing the above.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration centering on an image processing unit of the image processing apparatus according to the embodiment of the present invention;

FIG. 3 is a circuit diagram showing a configuration of a modulation width monitoring unit of the image processing device according to the embodiment of the present invention.

FIG. 4 is a waveform chart showing each waveform in a modulation width monitoring means of the image processing apparatus according to the embodiment of the present invention, and (a).
Is a waveform diagram showing the output of the crystal oscillator, (b) is a waveform diagram showing the output of the frequency modulation means, (c) is a waveform diagram showing the output of the phase comparator, and (d) is a waveform diagram showing the output of the filter. is there.

FIG. 5 is a flowchart illustrating a modulation width monitoring operation of the image processing apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 101 CPU 105 Operation panel 107 Relay circuit 108 Modulation width monitoring means 111 Image processing unit 201 Crystal oscillator 202 Frequency modulation means 301 Phase comparator 306, 307 Comparator

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C062 AA05 AB17 AB23 AB25 AB26 AB47 AB49 AC21 AC31 AC55 AF15 BA00 5C072 AA01 BA11 RA20 UA16 XA01 5C076 BA01 BA05 5C077 LL11 NP08 PP43 PQ01 PQ05 PQ20 RR10 SS06 TT06 TT10

Claims (17)

[Claims] 1. An image processing apparatus for reading an image from a document and performing image processing based on a clock, comprising: a clock generating means for generating a clock; a frequency modulating means for modulating a frequency of the generated clock; And a modulation width monitoring means for monitoring a modulation width of the image. 2. An image processing unit for performing image processing in synchronization with a clock modulated by the frequency modulation unit, wherein the modulation width monitoring unit outputs an output of the clock generation unit and an output of the frequency modulation unit. 2. The image processing apparatus according to claim 1, wherein the modulation width of the clock is monitored based on the comparison result. 3. The modulation width monitoring means includes: a comparison means for comparing an output of the clock generation means with an output of the frequency modulation means; and when the output of the comparison means is less than a reference minimum value or exceeds a reference maximum value. 3. The image processing apparatus according to claim 1, further comprising: detection signal output means for outputting a modulation width detection signal indicating that the modulation width has deviated from the reference range. 4. The power supply control device according to claim 1, further comprising a power supply control unit for turning off a power supply of the image processing apparatus when the modulation width monitoring unit detects a deviation of the modulation width from a reference range. The image processing apparatus according to any one of the preceding claims. 5. The image processing apparatus according to claim 1, further comprising a warning control unit that warns when the modulation width monitoring unit detects a deviation of the reference range of the modulation width. apparatus. 6. The image processing apparatus according to claim 5, wherein when the modulation width monitoring unit detects a deviation of the modulation width from a reference range, the warning control unit displays the fact on a display unit. 7. The image processing apparatus according to claim 5, wherein when the modulation width monitoring unit detects a deviation of the modulation width from a reference range, the warning control unit can give a warning by voice to that effect. . 8. The image processing apparatus according to claim 1, wherein the image processing apparatus is applicable to a copying machine and a scanner. 9. A modulation width monitoring method applied to an image processing apparatus for reading an image from a document and performing image processing based on a clock, comprising: a clock generating step of generating a clock; and modulating a frequency of the generated clock. A modulation width monitoring method, comprising: a frequency modulation step; and a modulation width monitoring step of monitoring a modulation width of a modulated clock. 10. An image processing step of performing image processing in synchronization with a clock modulated in the frequency modulation step, wherein in the modulation width monitoring step, an output of the clock generation step is compared with an output of the frequency modulation step. 10. The modulation width monitoring method according to claim 9, wherein the modulation width of the clock is monitored based on the comparison result. 11. The modulation width monitoring step includes: a comparison step of comparing an output of the clock generation step with an output of the frequency modulation step; and when the output of the comparison step is less than a reference minimum value or exceeds a reference maximum value. 11. A method according to claim 9, further comprising: outputting a modulation width detection signal indicating that the modulation width has deviated from the reference range. 12. The apparatus according to claim 9, further comprising a power control step of turning off the power of the image processing apparatus main body when the modulation width monitoring step detects a deviation of the modulation width from a reference range. The modulation width monitoring method as described. 13. The modulation width according to claim 9, further comprising a warning control step of warning when the modulation width monitoring step detects a deviation of the modulation width from a reference range. Monitoring method. 14. The modulation width monitoring method according to claim 13, wherein in the warning control step, when the modulation width monitoring step detects a deviation of a reference range of the modulation width, the fact is displayed by a display means. . 15. The modulation width monitoring apparatus according to claim 13, wherein in the warning control step, when the modulation width monitoring step detects a deviation of the modulation width from a reference range, a warning can be issued by voice to that effect. Method. 16. The modulation width monitoring method according to claim 9, wherein the method is applicable to a copying machine and a scanner. 17. A computer-readable storage medium storing a program for executing a modulation width monitoring method applied to an image processing apparatus that reads an image from a document and performs image processing based on a clock, wherein the modulation width is A storage medium, comprising: a clock generation step of generating a clock; a frequency modulation step of modulating a frequency of the generated clock; and a modulation width monitoring step of monitoring a modulation width of the modulated clock.