JP2000032189A - Image processor, method for detecting frequency modulation stop and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processor, a frequency modulation stop detecting method and a recording 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 both the outputs of the crystal oscillator and the frequency modulation means a filter for integrating the output of the phase comparator a frequency modulation stop detection means 108 provided with a comparator for outputting a modulation stop detection signal to a CPU 101 when the output of the filter is lower than reference voltage, and the CPU 101 for displaying warning on a display means of an operation panel 106 based on the input of the modulation stop detection signal, turning off a relay circuit 107 and controlling a power supply for the processor so as to save it.

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 frequency modulation stop detection method, and a storage medium, and more particularly, to an image processing apparatus and a frequency modulation method suitable for application to, for example, a digital copying machine or a scanner. The present invention relates to a stop detection 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.
An object of the present invention is to provide a frequency modulation stop detection 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 a clock generation means, a frequency modulation means for modulating the frequency of the generated clock, and a frequency modulation stop detection means for detecting a stop of the modulation function of the frequency modulation means.

According to a second aspect of the present invention, there is provided an image processing means for performing image processing in synchronization with a clock modulated by the frequency modulation means. Detecting a stop of the modulation function of the frequency modulation means based on a comparison result between the output of the clock generation means and the output of the frequency modulation means.

In order to achieve the above object, according to the present invention, the frequency modulation stop detecting means includes a comparing means for comparing an output of the clock generating means with an output of the frequency modulating means. A detection signal output unit that outputs a modulation stop detection signal indicating that the modulation function of the frequency modulation unit has stopped when the output of the comparison unit is equal to or less than the reference value.

According to a fourth aspect of the present invention, when the frequency modulation stop detecting means detects a stop of the modulation function of the frequency modulation means, the power of the image processing apparatus main body is turned off. It has a power control means.

In order to achieve the above object, according to the present invention, when the frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, a warning control means for warning the fact is provided. It is characterized by having.

In order to achieve the above object, the present invention according to claim 6, wherein the warning control means, when the frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, to that effect. It is characterized by being displayed by the display means.

In order to achieve the above object, the present invention according to claim 7, wherein the warning control means, when the frequency modulation stop detection means detects the stop of the modulation function of the frequency modulation means, to that effect. It is characterized by being able to warn by voice.

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 another aspect of the present invention, there is provided a frequency modulation stop detection method applied to an image processing apparatus for reading an image from a document and performing image processing based on a clock. , A frequency modulation step of modulating the frequency of the generated clock, and a frequency modulation stop detection step of detecting a stop of the modulation function of the frequency modulation step.

In order 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 frequency modulation stop detection step Detecting a stop of the modulation function of the frequency modulation step 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 frequency modulation stop detecting step includes a comparing 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 stop detection signal indicating that the modulation function of the frequency modulation step has stopped when the output of the comparison step is equal to or less than the reference value.

In order to achieve the above object, according to a twelfth aspect of the present invention, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation step, the power supply of the image processing apparatus main body is turned off. A power control step is provided.

In order to achieve the above object, according to the present invention, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation step, a warning control step for warning the stop is provided. It is characterized by having.

In order to achieve the above object, according to the present invention, in the warning control step, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation step, the fact is notified. It is characterized by being displayed by the display means.

In order to achieve the above object, the present invention according to claim 15 is characterized in that in the warning control step, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation means, the fact is notified. It is characterized by being able to warn by voice.

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, according to the present invention, a program for executing a frequency modulation stop detecting method applied to an image processing apparatus for reading an image from a document and performing image processing based on a clock is provided. A storage medium readable by a computer, wherein the frequency modulation stop detection 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 function of the frequency modulation step. And a frequency modulation stop detecting step of detecting the stop of the frequency modulation.

[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,
I / O interface 105, operation panel 106, relay circuit 107, frequency modulation stop detecting means 108, laser unit 109, CCD (Charge Coupled)
(Device) unit 110, an image processing unit 111, and a video bus 112.

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,
Frequency modulation stop detecting means 108, laser unit 109
Connected to each load.

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 frequency modulation stop detecting means 108 detects whether or not frequency modulation has stopped (a failure of the frequency modulation means 202 in FIG. 2) as described later. The CCD unit 110 reads image data of a document placed on a document table and outputs the data 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. Video bus 1
Reference numeral 12 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. Frequency modulation stop detecting means 108, CCD unit 1
10 is described in detail in 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. Frequency modulation stop detecting means 108
Receives the clock output from the crystal oscillator 201 and the clock output from the frequency modulation means 202, and outputs a modulation stop detection signal when the input clock is not modulated.

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 frequency modulation stop detection means 108 of the image processing apparatus according to the embodiment of the present invention will be described in detail. What is frequency modulation?
This is a patented technology for applying narrow-band modulation to a clock having a fixed oscillation frequency to reduce the electromagnetic radiation intensity of the fixed oscillation frequency. For example, US Pat.
7, US Pat. No. 5,563,1920.

FIG. 3 is a circuit diagram showing a configuration of the frequency modulation stop detecting means 108 of the image processing apparatus according to the embodiment of the present invention. The frequency modulation stop detecting means 108 includes, for example, E
A phase comparator 301 composed of an X-OR circuit and a filter 302 composed of, for example, a resistor R and a capacitor C
And a comparator 303. Phase comparator 3
01 is the output of the crystal oscillator 201 and the frequency modulation means 20
Compare the two outputs. The filter 302 is a phase comparator 3
Integrate the output of 01. The comparator 303 compares the output of the filter 302 with a reference voltage, and outputs a modulation stop detection signal to the I / O interface 105 based on the comparison result. 4A shows the output of the crystal oscillator 201,
(B) shows the output of the frequency modulation means 202, (c) shows the output of the phase comparator 301, and (d) shows the output of the filter 302.

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. Frequency modulation stop detection means 108 corresponds to the frequency modulation stop detection means,
The phase comparator 301 of the frequency modulation stop detection means 108 corresponds to the comparison means, the comparator 302 of the frequency modulation stop detection means 108 corresponds to the detection signal output means, the image processing unit 111 corresponds to the image processing means, The relay circuit 107 corresponds to a power control unit, and the CPU 101
Corresponds to warning control means, the operation panel 106 corresponds to display means, the crystal oscillator 201 corresponds to clock generation means, and the frequency modulation means 202 corresponds to frequency modulation means.

Next, the frequency modulation stop detecting operation of the image processing apparatus according to the embodiment of the present invention configured as described above will be described with reference to the flowcharts of FIGS. 1 to 4 and 5.

The clock output from the crystal oscillator 201 (FIG. 4A) and the clock output from the frequency modulation means 202 (FIG. 4B) are supplied to the phase comparator 301 of the frequency modulation stop detection means 108. Is entered. Now, FIG.
4 (a), the waveform shown in FIG. 4 (b) is an input signal (output of the crystal oscillator 201, frequency modulation means 202) as shown in FIG.
4), the output of the phase comparator 301 is
(C). The output of the phase comparator 301 is integrated by the filter 302, and becomes a signal as shown in FIG. Assume that the voltage level of the signal shown in FIG. That is, when the frequency modulation unit 202 fails and the clock is not modulated, the phases of the clocks input to the phase comparator 301 match, and V1 becomes 0V.

The comparator 303 compares the voltage level between VREF 304, which is a predetermined reference voltage, and V1, and outputs a high-level signal when VREF ≧ V1. If VREF is set to a value very close to 0 V, the modulation stop detection signal goes high when the frequency modulation means 202 fails, and the I / O interface 1
05 is input to the CPU 101.

FIG. 5 is a flowchart relating to control when the frequency modulation stop of the image processing apparatus according to the embodiment of the present invention is detected. Frequency modulation stop detecting means 108 for CPU 101 via I / O interface 105
When a high-level modulation stop detection signal is input from the CPU 101 (step S501), the CPU 101 displays a warning on a display unit (for example, a liquid crystal) (not shown) on the operation panel 106 via the I / O interface 105 (step S501). S50
2). Further, the CPU 101 stores the contents of the error in the RAM 10.
4 (step S503), and then the I / O
The relay circuit 107 is turned off via the interface 105 (step S504), and the power of the image processing apparatus is turned off.

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
In the following cases, a frequency modulation stop detecting means 108 including a comparator 303 that outputs a modulation stop detection signal to the CPU 101, a warning is displayed on a display unit on the operation panel 106 based on the input of the modulation stop detection signal, and a relay circuit Since it has the CPU 101 that controls to turn off the image processing apparatus by turning off the image processing apparatus 107, the following operations and effects are obtained.

In the above configuration, the phase comparator 301 of the frequency modulation stop detecting means 108 compares the outputs of the crystal oscillator 201 and the frequency modulating means 202, and inputs the output based on the comparison result to the filter 302. Filter 302
Integrates the output of the phase comparator 301 and
3, the comparator 303 sets the filter 302
Is below the reference voltage VREF, a modulation stop detection signal is output to the CPU 101. When the modulation stop 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 frequency modulation stop detecting means 108 detects the stop of the modulation function of the frequency modulation means 202, the CPU 101 controls the display section of the operation panel 106 to display. Although it was configured to display a warning, the present invention is not limited to this. For example, an audio output unit is provided in the image processing apparatus,
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. Since the apparatus includes the clock generation means, the frequency modulation means for modulating the frequency of the generated clock, and the frequency modulation stop detection means for detecting the stop of the modulation function of the frequency modulation means, the following effects are obtained. In an image processing apparatus that performs image processing based on a clock, by detecting the stop of the modulation function of the frequency modulation means, it is possible to reduce the burden on designers and engineers as well as to reduce electromagnetic radiation easily and at low cost as compared with the related art. There is an effect that it is possible to provide an image processing device capable of reducing the number of images.

According to the image processing apparatus of the present invention, there is provided an image processing means for performing image processing in synchronization with a clock modulated by the frequency modulation means, and the frequency modulation stop detecting means is provided with Since the stop of the modulation function of the frequency modulation means is detected based on the comparison result between the output of the clock 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, a stoppage of a modulation function of a frequency modulation unit is detected based on a comparison result between an output of a clock generation unit and an output of a frequency modulation unit, so that the design can be compared with a conventional one. Person,
There is an effect that it is possible to provide an image processing apparatus which can reduce the burden on the technician, and can easily reduce the electromagnetic radiation at low cost.

According to the image processing apparatus of the present invention, the frequency modulation stop detecting means compares the output of the clock generating means with the output of the frequency modulating means, and the comparing means When the output is below the reference value, there is provided a detection signal output means for outputting a modulation stop detection signal indicating that the modulation function of the frequency modulation means has been stopped, so that the following effects are obtained. 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 when the comparison output is equal to or less than a reference value, a modulation stop detection signal is output, thereby comparing with the conventional case. In addition, 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, when the frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, the power supply control for turning off the power of the image processing apparatus main body. Because of the means, the following effects can be obtained. In an image processing device that performs image processing based on a clock, by stopping the power of the image processing device when detecting the stop of the modulation function of the frequency modulation unit,
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.

According to the image processing apparatus of the present invention, when the frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, the image processing apparatus has the warning control means for giving a warning to that effect. The following effects are obtained.
In an image processing apparatus that performs image processing based on a clock, a warning is issued when the stop of the modulation function of the frequency modulation means is detected, so that the burden on designers and engineers is reduced as compared with the related art, and the cost is reduced. 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 frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, the warning control means displays the fact when the frequency modulation stop detection means detects the stop of the modulation function of the frequency modulation means. Therefore, the following effects can be obtained. In an image processing apparatus that performs image processing based on a clock, when a stop of a modulation function of a frequency modulation unit is detected, a warning is displayed on a display unit, thereby reducing the burden on designers and engineers 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 frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, the warning control means outputs the sound by voice. Since the warning can be made, the following effects are obtained. In an image processing device that performs image processing based on a clock, when a stop of the modulation function of the frequency modulation unit is detected, a warning can be issued by sound, thereby reducing the burden on designers and engineers 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, 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 a clock, detecting the stop of the modulation function of the frequency modulation means reduces the burden on designers and technicians as compared to the past, and makes it easier and less costly to use electromagnetic waves. There is an effect that an image processing apparatus capable of reducing radiation can be provided.

According to a ninth aspect of the present invention, there is provided a frequency modulation stop detection method applied to an image processing apparatus which reads an image from a document and performs image processing based on a clock. , A frequency modulation step of modulating the frequency of the generated clock, and a frequency modulation stop detection step of detecting a stop of the modulation function of the frequency modulation step. . In an image processing apparatus that performs image processing based on a clock, by detecting the stop of the modulation function of the frequency modulation step, 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 device capable of reducing the number of images.

According to the frequency modulation stop detecting 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 stop of the modulation function of the frequency modulation step is detected based on the comparison result 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 device that performs image processing based on a clock, based on the comparison result of the output of the clock generation step and the output of the frequency modulation step, detection of the stop of the modulation function of the frequency modulation step is performed, and the design is compared with the conventional one. There is an effect that it is possible to provide an image processing apparatus that can reduce the burden on persons and technicians, and that can reduce electromagnetic radiation easily at low cost.

According to the frequency modulation stop detecting method of the present invention, the frequency modulation stop detecting step includes: a comparing step of comparing an output of the clock generating step with an output of the frequency modulating step; If the output of the comparison step is equal to or less than the reference value, the detection signal output step of outputting a modulation stop detection signal indicating that the modulation function of the frequency modulation step has stopped has the following effects. An image processing apparatus that performs image processing based on a clock compares the output of a clock generation step with the output of a frequency modulation step, and outputs a modulation stop detection signal when the comparison output is equal to or less than a reference value, thereby comparing with the conventional case. In addition, 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 frequency modulation stop detecting method of the present invention, when the frequency modulation stop detecting step detects the stop of the modulation function of the frequency modulation step, the power supply of the image processing apparatus is turned off. Since the power supply control step is provided, the following effects can be obtained. In an image processing apparatus that performs image processing based on a clock, when the stop of the modulation function of the frequency modulation step is detected, the power of the image processing apparatus is turned off, so that the designer,
There is an effect that it is possible to provide an image processing apparatus which can reduce the burden on the technician, and can easily reduce the electromagnetic radiation at low cost.

According to the frequency modulation stop detecting method of the present invention, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation step, a warning control step for warning the stop is provided. To have
The following effects are obtained. In an image processing apparatus that performs image processing based on a clock, a warning is issued when a stop of the modulation function of the frequency modulation step is detected, so that the burden on designers and engineers is reduced, and the cost is reduced and the cost is reduced. There is an effect that an image processing apparatus capable of easily reducing electromagnetic radiation can be provided.

According to the frequency modulation stop detecting method of the present invention, in the warning control step, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation step, the fact is notified. Since the display is performed by the display means, the following effects are obtained. In an image processing apparatus that performs image processing based on a clock, when a stop of a modulation function of a frequency modulation step is detected, a warning is displayed on a display unit, thereby reducing the burden on designers and engineers 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 frequency modulation stop detecting method of the present invention, in the warning control step, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation means, the fact is notified. Since the warning can be made by voice, the following effects are obtained. In an image processing device that performs image processing based on a clock, when a stop of the modulation function of the frequency modulation step is detected, a warning can be issued by voice, thereby reducing the burden on designers and engineers compared with the conventional one. 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 frequency modulation stop detection method of the present invention, the following effects can be obtained because the method is applicable to a copying machine and a scanner. In copiers and scanners that perform image processing based on a clock, detecting the stop of the modulation function of the frequency modulation step reduces the burden on designers and technicians as compared with the past, and makes it easier and less costly to use electromagnetic waves. There is an effect that an image processing apparatus capable of reducing radiation can be provided.

According to the storage medium of the present invention, there is provided a computer storing a program for executing a frequency modulation stop detection method applied to an image processing apparatus for reading an image from a document and performing image processing based on a clock. Wherein the frequency modulation stop detection method includes a clock generation step of generating a clock, a frequency modulation step of modulating the frequency of the generated clock, and a stop of the modulation function of the frequency modulation step. Since the frequency modulation stop detecting step is performed, the following effects can be obtained. In an image processing apparatus that performs image processing based on a clock, by detecting the stop of the modulation function of the frequency modulation step, 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 device capable of reducing the number of images.

[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 illustrating a configuration of a frequency modulation stop detection unit of the image processing apparatus according to the embodiment of the present invention.

4A and 4B are waveform diagrams showing waveforms in a frequency modulation stop detecting unit of the image processing apparatus according to the embodiment of the present invention, wherein FIG. 4A is a waveform diagram showing an output of a crystal oscillator, and FIG. FIG. 3 is a waveform diagram showing an output of the means, FIG. 3C is a waveform diagram showing an output of the phase comparator, and FIG. 3D is a waveform diagram showing an output of the filter.

FIG. 5 is a flowchart showing a frequency modulation stop detection 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 Frequency modulation stop detecting means 111 Image processing unit 201 Crystal oscillator 202 Frequency modulating means 301 Phase comparator 303 Comparator

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 frequency modulation stop detecting means for detecting a stop of the modulation function of the means. 2. An image processing means for performing image processing in synchronization with a clock modulated by the frequency modulation means, wherein the frequency modulation stop detection means includes an output of the clock generation means and an output of the frequency modulation means. 2. The image processing apparatus according to claim 1, wherein a stop of the modulation function of the frequency modulation unit is detected based on a comparison result of the above. 3. The frequency modulation stop detecting means, comprising: comparing means for comparing the output of the clock generating means with the output of the frequency modulating means; and the frequency modulating means when the output of the comparing means is equal to or less than a reference value. 3. The image processing apparatus according to claim 1, further comprising: a detection signal output unit that outputs a modulation stop detection signal indicating that the modulation function has stopped. 4. A power supply control means for turning off the power supply of the image processing apparatus main body when said frequency modulation stop detecting means detects a stop of a modulation function of said frequency modulation means. The image processing device according to any one of the above. 5. The apparatus according to claim 1, further comprising warning control means for warning when the frequency modulation stop detecting means detects a stop of the modulation function of the frequency modulation means. The image processing apparatus according to any one of the preceding claims. 6. The warning control means according to claim 5, wherein when the frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, the warning control means displays the fact by a display means. Image processing device. 7. The warning control means according to claim 5, wherein when the frequency modulation stop detecting means detects the stop of the modulation function of the frequency modulation means, the warning control means can sound a warning to that effect by voice. Image processing device. 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 frequency modulation stop detection 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. And a frequency modulation stop detecting step of detecting a stop of a modulation function of the frequency modulation step. 10. An image processing step of performing image processing in synchronization with a clock modulated in the frequency modulation step, wherein in the frequency modulation stop detection step, an output of the clock generation step and an output of the frequency modulation step are output. 10. The frequency modulation stop detection method according to claim 9, wherein the stop of the modulation function in the frequency modulation step is detected based on the comparison result of the above. 11. The frequency modulation stop detecting step includes:
A comparison step of comparing the output of the clock generation step with the output of the frequency modulation step, and a modulation stop detection signal indicating that the modulation function of the frequency modulation step has stopped when the output of the comparison step is equal to or less than a reference value. 11. A frequency modulation stop detection method according to claim 9, further comprising: outputting a detection signal. 12. The apparatus according to claim 9, wherein said frequency modulation stop detecting step includes a power control step of turning off the power of the image processing apparatus main body when detecting a stop of the modulation function of said frequency modulation step. The frequency modulation stop detection method according to any one of the above. 13. The apparatus according to claim 9, further comprising a warning control step of warning a stop of the modulation function of the frequency modulation step when the frequency modulation stop detection step detects a stop of the modulation function of the frequency modulation step. The frequency modulation stop detection method described in the above. 14. The warning control step according to claim 13, wherein, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation step, the warning is displayed by a display means. Frequency modulation stop detection method. 15. The method according to claim 13, wherein in the warning control step, when the frequency modulation stop detecting step detects a stop of the modulation function of the frequency modulation means, a warning can be issued by voice to that effect. Frequency modulation stop detection method. 16. The frequency modulation stop detection 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 frequency modulation stop detection method applied to an image processing apparatus that reads an image from a document and performs image processing based on a clock, the program comprising: The modulation stop detection method includes a clock generation step of generating a clock, a frequency modulation step of modulating the frequency of the generated clock, and a frequency modulation stop detection step of detecting stop of a modulation function of the frequency modulation step. Characteristic storage medium.