JPH03219226A - Image processor - Google Patents

Abstract

PURPOSE:To accurately and speedily detect abnormal vibration by arranging a dummy original which is lighted by an optical system and scanned on an original platen, receiving reflected light from the dummy original and calculating the vibration level, and comparing it with a reference vibration level which is stored previously. CONSTITUTION:The dummy original which is lighted by the optical system and scanned is arranged outside the original arrangement area of the original platen. The reflected light from the dummy original is received through an optical system and the signal from a photodetector is processed by Fourier transformation to calculate the vibration level. Thus, the levels by vibration frequencies which are calculated by the arithmetic means are compared with the reference vibration level which is stored previously and when a comparative decision means 83 detects an abnormal spectrum, an abnormality display is made. Consequently, the abnormal vibration of the original platen and optical system can speedily be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image processing device such as an electrostatic copying machine or a document reading device.

<Prior Art> In an image processing device such as an electrostatic copying machine or a document reading device that illuminates and scans a document placed on a document table by moving the document table and an optical system relative to each other, each part of the device ,
In particular, rattling or the like may occur in the document table or optical system, abnormalities may occur in the movement of the document table or optical system, or uneven light intensity or flickering may occur in the lamps among the optical elements that make up the optical system. If this occurs, the formed or read image may be adversely affected, resulting in image defects such as image blur or density unevenness.

Conventional image processing devices are not equipped with means for detecting the above-mentioned abnormalities. Therefore, in order to detect the above-mentioned abnormalities, for example, in the case of an electrostatic copying machine, the formed image must be visually evaluated. things were being done.

<Problems to be Solved by the Invention> However, when visually evaluating a formed image, if the density of the image is low or the difference in density is small, it may be difficult to judge whether the image is good or bad.

Further, there is a problem in that the above judgment requires a certain degree of skill and is likely to vary due to individual differences among observers. Moreover, since it is difficult to detect the abnormality until it has progressed to a certain extent, there are problems in that the detection of the abnormality is delayed, resulting in a large amount of defective images and mechanical deterioration of the device.

On the other hand, in the case of a document reading device, since it is not possible to visually evaluate the image directly, there is a problem that the image must be formed again, which is time-consuming.

The present invention has been made in view of the above circumstances, and is intended to detect abnormal vibrations more accurately and quickly in an image processing apparatus equipped with an optical system and a document table that moves relative to each other during illumination scanning of a document. It is an object of the present invention to provide an image processing apparatus that can prevent a large number of image defects from occurring and mechanical deterioration of the apparatus.

<Means and operations for solving the problem> In order to solve the above problem, the first image processing device has a first image processing device which has a simulated original having a specific pattern illuminated and scanned by an optical system outside the original placement area of the original table. a light receiving element that is arranged and receives reflected light from the simulated original via the optical system;
a calculation means for Fourier-transforming the signal from the light receiving element to calculate a vibration level for each frequency; and a calculation means for calculating a vibration level for each frequency by Fourier transforming the signal from the light receiving element; Comparison and determination means for comparing and determining whether or not the calculated level for each frequency includes an abnormal spectrum that is not in the reference vibration level; and an abnormality display when the comparison and determination means detects an abnormal spectrum. (Claim 1).

According to this image processing device, a simulated original having a specific pattern is illuminated and scanned by an optical system, and the light reflected from the simulated original is received by a light receiving element, and the obtained signal is Fourier-transformed by a calculation means, thereby generating vibrations. Calculate the vibration level for each number.

This makes it possible to know the frequency components included in the vibrations of the document table and the optical system. Furthermore, the comparative judgment means compares the reference vibration level for each frequency of the document table and optical system with the level for each frequency calculated by the calculation means, and determines whether an abnormal spectrum that is not in the reference vibration level is included. Determine whether or not. Abnormal spectra are usually caused by the main abnormalities of the document table or optical system, such as rattling, abnormal operation of moving parts, and uneven light intensity or flickering of lamps. If this is detected, it can be determined that an abnormality has occurred in either direction, and the display means can display this fact.

Further, the second image processing device has the simulated original placed on both sides of the original placement area of the document table, and receives reflected light from the simulated original through two light receiving elements, respectively. The signals from the two light-receiving elements are individually Fourier-transformed to calculate the vibration level for each frequency, and the vibration level for each frequency stored in advance and the vibration for each frequency calculated by the above calculation means are calculated. It is determined whether or not any of the vibration levels includes an abnormal spectrum that does not exist in the reference vibration level (claim 2).

According to this image processing device, reflected light from two simulated originals is received by each light receiving element, and is individually Fourier-transformed to obtain a vibration level for each frequency, and a pre-stored reference vibration for each frequency. By comparing with the level, it is possible to display an abnormality when at least one of the data includes an abnormal spectrum, so that abnormality detection can be performed more reliably.

In the third image processing device, a simulated original having a specific pattern that is illuminated and scanned by an optical system is placed outside the original placement area of the original platen, and a light receiving element that receives reflected light from the simulated original is configured to operate the optical system. The light-receiving element is provided in at least two of the constituent optical elements, and is provided with arithmetic means for individually Fourier-transforming the signal from each light-receiving element to calculate a vibration level for each frequency. A reference vibration level for each frequency that is stored in advance for each optical element,
Comparison judgment for each optical element to determine whether or not the calculated vibration level includes an abnormal spectrum that is not in the reference vibration level by comparing the data for each vibration frequency calculated by the calculation means. and display means for displaying an abnormality of the corresponding optical element when the comparison and determination means detects an abnormal spectrum (claim 3).

According to this image processing device, reflected light from a simulated original is
A procedure in which light is individually received by light receiving elements provided in at least two optical elements, and the vibration level for each frequency calculated through individual Fourier transformation is compared with a pre-stored reference vibration level for each frequency. By performing this for each optical element provided with a light-receiving element, the display means can display the optical element in which the abnormality has occurred.

Therefore, since the optical element in which the abnormality has occurred can be immediately identified, maintenance work can be performed quickly.

The fourth image processing device includes a reciprocating movable member for illuminating and scanning a document, and only one end of the movable member is slidably attached to the main body of the device. In the processing device, two simulated originals having a specific pattern are arranged at predetermined parts of the apparatus main body side corresponding to both ends of the moving member, and two simulated originals having a specific pattern are arranged at both ends of the moving member to read each simulated original individually. In addition, there is a calculation means that performs Fourier transform on the signals from each light receiving element to calculate the vibration level for each frequency, and a pre-stored reference vibration level for each frequency. , a comparison determination means for comparing the levels for each vibration frequency corresponding to each of the simulated manuscripts calculated by the calculation means to determine whether any of them includes an abnormal spectrum that is not in the reference vibration level; and display means for displaying an abnormality when the comparison and determination means detects an abnormal spectrum (claim 4).

According to this image processing device, two simulated originals are individually read by two light-receiving elements provided at both ends of the moving member, and the signals from each light-receiving element are individually stored and memorized by the storage means. The vibration level for each vibration frequency is calculated by Fourier transforming the data using a calculation means. This makes it possible to know each frequency component included in the vibrations at both ends of the moving member.

In the first to fourth image processing apparatuses, the reference vibration level may be selected from the vibration level stored in the storage means during normal rotation of the optical system (claim 5).

According to this, the comparison and determination means can perform the above-mentioned abnormal vibration determination with high accuracy.

In the second image processing device and the fourth image processing device, the comparison/judgment means compares the data obtained by individually Fourier transforming the signal from each light receiving element, and determines the difference between the two data. It may further include a function of causing the display means to display an abnormality when a change occurs (Claim 6).

According to this, in addition to the above-mentioned judgment of abnormal vibration, the comparative judgment means compares the data obtained by Fourier transforming the signals from the two light-receiving elements individually, and the difference between the two data changes. Even in this case, this is determined to be abnormal and the display means is made to display an abnormality.

Therefore, even if the various abnormalities occur only on one side of each part, they can be detected without omitting them, and as a result, more fine-grained abnormality detection can be performed.

In particular, in the fourth invention, the fixed end of the moving member;
The speed difference with the other free side end, that is, the shake of the free side end can be quickly detected with high sensitivity.

<Embodiment> An image processing apparatus of the present invention will be described below with reference to drawings showing an electrostatic copying machine as an embodiment.

As shown in FIG. 3, the electrostatic copying machine of this embodiment has a document table 2 on the top surface of the main body 1 for placing the document to be copied, and a document table 2 for placing the document in close contact with the document table 2. An optical system 4 is provided inside the apparatus main body 1 for illuminating and scanning the original placed on the upper surface of the original platen 2. After the formed electrostatic latent image is visualized by the developing device 52,
An image processing unit 5 that transfers the image onto a paper, and a paper that sends the paper from a paper cassette 61 to the image processing unit 5 and discharges the image-processed paper onto a paper output tray 62 via a fixing unit 7. The transport section 6 is also provided.

The optical elements constituting the optical system 4 include a first moving member 41 and a second moving member 42 that move with respect to the device main body 1, as shown by white arrows and two-dot chain lines in the same figure. A lens 43 and a fixed mirror 44 are fixed to the main body 1, and the first movable member 41 is provided with an original platen 2.
A lamp 41b serves as a light source for irradiating light onto a document placed above, and the light from this lamp 41b is transmitted to the document table 2.
a reflecting plate 41c for reflecting the light to the side; a mirror 41d for guiding the reflected light from the document to the second moving member 42;
Two mirrors 42b provided on the second moving member 42 and for guiding the reflected light from the mirror 41c to the lens 43.
, 42C are provided, respectively.

As shown in FIG. 1, the two moving members 41 and 42 have one end slidably fixed to a sliding bar 11 fixed to the main body of the device, and the other end mounted on a sliding plate 12. It is mounted so that it can slide freely, and is driven by a drive system (not shown).
It is configured to move along the sliding bar 11 and the finger plate 12. Note that the two moving members 41.
As a drive system for moving the motor 42, a normal structure including a motor and a wire wound around the rotating shaft of the motor can be adopted.

Within the range illuminated by the lamp 41b of the document table 2 and outside the area where the maximum size document is placed, there is a first
As shown in the figure, two simulated originals B are provided along the original scanning direction, which serve as a reference for detecting abnormal spectra, which will be described later. As the above-mentioned simulated original B, one in which black and white patterns are regularly arranged is used, as shown in FIG. 4, for example.

Further, as shown in FIG. 2, reflections from the two simulated originals B are placed near both ends of the photoreceptor drum 51 at positions that do not hinder the formation of electrostatic latent images on the photoreceptor drum 51. Two light receiving elements P that individually receive light are arranged,
Signals from these two light receiving elements P are input to the microcomputer 8 via a filter F and an A/D converter, respectively. The filter F is for cutting unnecessary signals from the light receiving element P.

The microcomputer 8 includes a RAM 81 that individually stores signals from each light receiving element P over one scanning period of the optical system 4.
A calculation means 82 calculates the vibration level for each vibration frequency by Fourier transforming the data stored in the RAM 81, and two pieces of data for each vibration frequency calculated by the calculation means 82 are stored in the RAM 81 in advance. It is determined whether or not an abnormal spectrum is included in the data by individually comparing the vibration level with the reference vibration level for each frequency, and the signals of the two light receiving elements P are individually Fourier-transformed. It has a comparison and determination means 83 that compares the data and determines whether the difference between the two data has changed compared to the difference in normal times. Note that the term "change in difference" as used herein includes a case where there is a change from a state where there is no difference to a state where there is a difference (the same applies hereinafter).

The microcomputer 8 also stores data obtained by Fourier transforming the signals from the two light-receiving elements P when it is determined by the comparison/judgment means 83 that the data contains an abnormal spectrum. display means 91 for displaying an abnormality when it is determined that the difference between
and a drive stop means 92 that stops the drive of the entire copying machine when the abnormality is determined. Drive stop means 92
can also be implemented without configuring it.

However, if the drive stop means 92 is provided, it is possible to prevent a large number of defective copies and damage to the document table 2 and optical system 4 due to continued operation ignoring the abnormality displayed by the display means 91. It has the advantage of being possible.

With the above configuration, the detection signal of the light receiving element P (Fig. 5 (
al) is inputted to the microcomputer 8 and stored in the RAM 81, and the stored data is subjected to Fourier transformation by the calculation means 82, and the vibration After calculating the vibration level for each number (see FIG. 5 (b+), the comparison and determination means 83
Determine the presence or absence of the above-mentioned abnormal spectrum and the presence or absence of a change in the difference between the two data corresponding to each light receiving element P, and determine that at least one of the abnormal spectrum and the change in the difference between the two data is present. In this case, the display means 91 displays an abnormality, and the drive stop means 92
The drive of the entire copying machine can be stopped by this.

Note that, as the reference vibration level used to determine the presence or absence of an abnormal spectrum, initial data measured at the time of installation of the device, previous measurement data, etc. are used, for example.

As described above, according to the electrostatic copying machine of this embodiment, abnormalities in the document table 2 and the optical system 4 can be detected in advance and countermeasures can be taken at an early stage, so that a large number of defective copies can be avoided. It is possible to prevent this from occurring.

In particular, since the presence or absence of an abnormal spectrum is determined by Fourier-transforming the signals from the light-receiving elements P and comparing the vibration levels for each frequency, accurate determination can be made. Moreover, since the presence or absence of a change in the difference between the two pigs corresponding to each light receiving element P is also determined, the end of the moving member 41, 42 of the optical system 4 on the sliding bar 11 side (fixed side end) The speed difference between the moving member 41 and the end on the sliding plate 12 side (free side end M), that is, the vibration of the end on the sliding plate 12 side of the moving members 41 and 42 can be detected with high sensitivity.

Note that it is preferable to repeatedly perform the above measurement while the electrostatic copying machine is in operation, since abnormalities in the document table 2 and the optical system 4 can be constantly monitored.

In the above embodiment, two mock originals B are placed on the original table 2.
is arranged, and two light-receiving elements P corresponding to the two simulated originals B are provided inside the apparatus, but there may be only one simulated original and one light-receiving element. In this case, the comparison and determination means 83 naturally does not have the function of comparing data obtained based on the signals from the two light receiving elements P.

FIG. 6 is a block diagram showing an embodiment of the invention according to claim 3. This embodiment differs greatly from the previous embodiments in that the light receiving element P that receives the reflected light from the mock original B is
It is provided for each predetermined optical element among the optical elements constituting the optical system 4. That is, the light receiving element P is
Among the optical elements constituting the optical system 4, a mirror 41d provided on the first moving member 41- and the second moving member 42
The two mirrors 42b and 42c provided therein and the fixed mirror 44 that projects the original image onto the photoreceptor drum 51 are respectively provided integrally with each other. However, the light receiving elements P are arranged such that the optical paths leading to the simulated original B are shifted from each other so that each of the light receiving elements P can receive the reflected light from the simulated original B.

In this embodiment, the RAM 81 individually stores signals from each light receiving element P provided with the light receiving element P, and also stores signals from each of the mirrors 41d and 42b.

The reference vibration level for each frequency is stored for each of 42c and 44. Further, the calculation means 82 is a RAM
The data for each light receiving element P stored in 81 is individually Fourier transformed to calculate the vibration level for each frequency. Further, the comparison and determination means 83 individually compares the pre-stored reference vibration level for each of the mirrors 41d, 42b, 42c, and 44 with the data for each vibration frequency calculated by the calculation means 82, It is determined for each mirror 41d, 42b, 42c, 44 whether or not any of the data includes an abnormal spectrum that is not at the reference vibration level. Mirrors 41d, 42b, 42c are detected.
, 44, an abnormality is displayed for the corresponding one.

According to this embodiment, each mirror 41d, 42b.

The detection signals of the light receiving elements P provided in 42c and 44 are input to the microcomputer 8 and stored individually in the RAM 81, and each of the stored data is input to the calculation means 82.
After the vibration level for each frequency is calculated for each mirror 41d, 142b, 42c, and 44 by performing Fourier transformation individually, the comparison and determination means 83 determines the presence or absence of the abnormal spectrum described above for each mirror 41d, 42b, 42c, and 44. If it is determined that there is an abnormal spectrum, the display means 91 displays each mirror 41d, 42b.

It is possible to display the abnormality of one of the copying machines 42c and 44, and to stop the driving of the entire copying machine by the drive stop means 92.

Therefore, since the optical element in which the abnormality has occurred can be immediately identified, maintenance work can be performed quickly.

In this embodiment, the number of light-receiving elements P for each simulated document B and each optical element may be at least one.

Further, the light receiving element P may be provided in at least two of the optical elements constituting the optical system 4.

In the above embodiment, the RAM 81 is configured to store the reference vibration waveforms of each optical element provided with the light receiving element P, and the comparison/judgment means 83 is configured to store the reference vibration waveforms stored in the RAM 8 and the reference vibration waveforms from the light receiving element P. Signal waveform (Fig. 5 (a)
The presence or absence of abnormal vibration may be determined for each optical element based on a change in the difference between the optical element and the optical element. In this case, the display means 9 can be used without configuring the calculation means 82, that is, without Fourier transforming the signal from the light receiving element P.
1 allows abnormalities in each optical element to be displayed for each corresponding optical element. Alternatively, the signal from the light receiving element P and the reference vibration waveform stored in the RAM 81 may be compared in real time while illuminating and scanning the simulated original B.

Next, FIG. 7 is a perspective view showing an embodiment of the invention according to claim 4.

In this embodiment, the simulated original B is the movable member 4
1.Sliding bar 11 and sliding plate 1 corresponding to both ends of 42
They are arranged along each of the two. Further, at both ends of one of the moving members 41, light receiving elements P for reading each simulated original B are arranged. Signals from these two light receiving elements P are input to the microcomputer 8 via a filter F and an A/D converter A, respectively (see FIG. 8).

The microcomputer 8 has a configuration similar to that of the embodiment shown in FIG. A calculation means 82 calculates the vibration level for each vibration frequency by Fourier transforming the data, and the two data for each vibration frequency calculated by the calculation means 82 are
It is determined whether or not an abnormal spectrum is included in the data by individually comparing it with a reference vibration level for each frequency stored in advance, and the signals of the two light receiving elements P are individually Fourier transformed. Compare the obtained data and
It has a comparison determination means 83 that determines whether the difference between both data has changed compared to the difference in normal times. The microcomputer 8 includes a comparison and determination means 83.
display means 91 for displaying an abnormality when it is determined that an abnormal spectrum is included in the data and/or when it is determined that there is a change in difference between the data from the two light receiving elements P; A drive stop means 92 is connected to stop the drive of the entire copying machine at the time of the above determination.

According to this embodiment, the signal from the light-receiving element P is input to the microcomputer 8, and thereafter the same processing as in the embodiment shown in FIG. It is determined whether there is a change in the difference between the two data corresponding to the element P, and if there is an abnormality, this is displayed on the display means 91, and the drive stop means 9
2, the driving of the entire copying machine can be stopped.

In particular, since it is also determined whether there is a change in the difference between the two data corresponding to each light receiving element P, the speed difference between the fixed side end of the moving member 41 and the other free side end, that is, the free side Edge shake can be detected quickly and with high sensitivity.

Incidentally, in the above embodiment, the mock manuscript B is provided outside the manuscript placement area of the manuscript table 2, as in the embodiment shown in FIG.
This simulated original B may be read by the light receiving element P.

In addition, the comparison and determination means 83 determines whether there is a change in the difference between the two data corresponding to each light receiving element P, so that blurring of the free side end can be quickly detected as described above. Therefore, it is preferable, but it is also possible to implement a configuration in which this determination is not made.

On the other hand, in the embodiments shown in FIGS. 2 and 8, the calculation means 82 is not provided, and the comparison and determination means 83 directly compares the signal waveforms from each light-receiving element P. The display unit may be provided with a function of displaying an abnormality in the event of a change.

Furthermore, in each of the embodiments in which the calculation means 82 is configured, a configuration may be adopted in which the signal from the light receiving element P is directly input to the calculation means 82 without being stored in the RAM 81 and is subjected to Fourier transformation in real time.

Although each of the above embodiments has shown an example of an electrostatic copying machine, the image processing device of the present invention can also be applied to a document reading device, as described above. A light receiving element that receives light and converts it into an electrical signal for recording can be used in combination with a light receiving element that receives reflected light from the simulated original.

Further, the present invention can be appropriately applied to an image processing apparatus of a document moving type in which a document is moved together with a document table.

In addition, various design changes can be made without changing the gist of the invention.

<Effects of the Invention> The image processing apparatus of the present invention is configured as described above, and can quickly detect abnormal vibrations in the document table or optical system, thereby preventing the occurrence of a large number of image defects. This can prevent mechanical deterioration of the device.

In particular, according to the image processing apparatus of claim 2, the reflected light from the two simulated originals is received by each light receiving element, and is individually Fourier-transformed to determine the vibration level for each frequency. By comparing with the reference vibration level for each number, if at least one of the data contains an abnormal spectrum, it is possible to display an abnormality, so abnormality detection can be performed more reliably. play.

Further, according to the image processing device of claim 3, since the abnormality can be displayed for each optical element in which the abnormality has occurred, the optical element in which the abnormality has occurred can be immediately identified, and as a result, maintenance work can be carried out. It has the unique effect of being able to be carried out quickly.

Furthermore, according to the image processing apparatus of claim 4, abnormality is determined by comparing the data corresponding to each light receiving element provided at both ends of the moving member. It has the unique effect of being able to detect quickly with high sensitivity.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the main parts of an electrostatic copying machine as an embodiment of the image processing device of the present invention, and FIG. 2 is a block diagram showing an abnormality detection device in the above embodiment. , FIG. 3 is a schematic diagram showing the internal configuration of the above embodiment, FIG. 4 is a plan view showing an example of a simulated manuscript, and FIG. 5 is a diagram showing vibration data, of which (a) shows the light receiving element. (b) shows the data after Fourier transform of the above data. FIG. 6 is a block diagram showing another embodiment of the device for abnormality detection, FIG. 7 is a partially cutaway diagram showing another embodiment, and FIG. 8 is the device for detecting abnormality in the previous embodiment. Block diagram showing. 2... Original table, 4... Optical system, 41.42... Moving member, 82... Calculating means, 83
. . . Comparative determination means, 91 . . . Display means B . . . Simulated manuscript, P .

Claims (1)

[Claims] 1. An optical system illuminates and scans a document placed on a document table;
In an image forming apparatus that forms an image by guiding light reflected from an original to a rotating photoreceptor and transferring the image formed on the photoreceptor to transfer paper, an optical system is installed outside the original placement area of the original platen. A simulated original having a specific pattern that is scanned by illumination is arranged, and a light receiving element that receives the reflected light from the simulated original via the optical system, and a signal from the light receiving element is Fourier transformed and transmitted for each frequency. a calculation means for calculating the vibration level of the vibration level, and a calculation means for calculating the vibration level for each frequency by comparing the level for each vibration frequency calculated by the calculation means with a reference vibration level for each vibration frequency stored in advance. The method is characterized by comprising a comparison determination means for determining whether an abnormal spectrum not found in the reference vibration level is included, and a display means for displaying an abnormality when the comparison determination means detects an abnormal spectrum. Image processing device. 2. The simulated originals are placed on both sides of the original placement area of the document table, and two light-receiving elements are provided to receive reflected light from each of the simulated originals via the optical system. , the calculation means individually performs Fourier transform on the signals from the two light-receiving elements to calculate the vibration level for each frequency, and the comparison determination means stores the levels for each vibration frequency calculated by the calculation means in advance. A request to display an abnormality when it is detected that at least one of the calculated levels for each frequency includes an abnormal spectrum that is not in the standard vibration level. Item 1. Image processing device according to item 1. 3. In an image processing apparatus equipped with a document table that moves relatively during illumination scanning of the document and an optical system composed of a plurality of optical elements, a specific area of the document table that is illuminated and scanned by the optical system is located outside the document placement area of the document table. A simulated original having a pattern is arranged, and at least two of the optical elements constituting the optical system are provided with light-receiving elements that receive reflected light from the simulated original, and a signal from each light-receiving element is provided. A calculation means for individually performing Fourier transform to calculate the vibration level for each frequency; a reference vibration level for each frequency stored in advance for each optical element provided with a light receiving element; a comparison determination means for determining, for each optical element, whether or not the calculated vibration level includes an abnormal spectrum that is not in the reference vibration level by comparing the vibration levels for each frequency; An image processing apparatus comprising: display means for displaying an abnormality of a corresponding optical element when the means detects an abnormal spectrum. 4. In an optical system moving type image processing apparatus, which is equipped with a reciprocating moving member for illuminating and scanning a document, and in which only one end of this moving member is slidably attached to the main body of the apparatus, the moving member Two simulated originals having a specific pattern are arranged at predetermined parts of the main body of the apparatus corresponding to both ends of the moving member, and two light-receiving elements for individually reading each simulated original are arranged at both ends of the movable member. Furthermore, a calculation means for individually Fourier-transforming the signals from each light-receiving element to calculate the vibration level for each frequency, a pre-stored reference vibration level for each frequency, and calculation by the above-mentioned calculation means. a comparison determination means for comparing the vibration levels for each vibration frequency corresponding to each of the simulated originals and determining whether any of the vibration levels includes an abnormal spectrum that is not in the reference vibration level; 1. An image processing apparatus comprising: display means for displaying an abnormality when the comparison determination means detects an abnormal spectrum. 5. Claim 1, wherein the reference vibration level is a vibration level stored in the storage means during normal rotation of the optical system.
5. The image forming apparatus according to any one of 2, 3, and 4. 6. The comparison/judgment means compares the data obtained by Fourier transforming the signals from both light receiving elements individually, and has a function of causing the display means to display an abnormality when the difference between the two data changes. The image processing device according to claim 2 or 4, further comprising: