JP3377156B2 - Toner adhesion amount measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner adhesion amount measuring device, and more particularly, to an intermediate transfer in an apparatus such as a copying machine, a printer or a facsimile which uses an electrophotographic process method and is equipped with an intermediate transfer member. The present invention relates to a toner adhesion amount measuring device capable of highly accurately measuring the adhesion amount of toner transferred to a body.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for higher image quality in copying machines, printers, facsimiles and other devices using electrophotographic process systems. To achieve high image quality,
Since the density of the toner adhered on the photoconductor is an important factor, there is a demand for a more accurate detection technology of the toner adhesion amount.

Generally, a so-called toner density sensor (optical sensor) is used for measuring the toner adhesion amount after the development processing in the dry electrophotographic apparatus. This optical sensor is
A combination of an ED and a photodiode is used to irradiate the toner attached to the photoconductor with light, and the intensity of the reflected light reflected by the toner is measured. However,
This optical sensor has a problem that the linearity is not good and the measurement accuracy is poor especially when the toner density to be measured is high, but it is extremely inexpensive and is widely used.

Therefore, in order to improve the measurement accuracy of the toner density, a "toner powder image thickness measuring device and a color printing device using the same" disclosed in Japanese Patent Laid-Open No. 4-156479 has been proposed. This measuring device does not detect the amount of light reflected from the toner image on the photoconductor, but optically detects the change in the thickness of the toner layer, thereby improving the toner density detection accuracy.

That is, this measuring device is intended to measure the toner adhesion amount and to adjust the printing process based on the measurement result. The laser light source for irradiating the toner powder image on the photoconductor with the measuring light and the toner powder. The thickness of the toner powder image is measured based on the light receiving position of the reflected light at the light receiving unit, which has a slit for removing the scattering of the reflected light from the image and a light receiving unit for receiving the reflected light that has passed through the slit. Is to do.

[0006]

However, in the conventional toner adhesion amount measuring device, an accurate measurement is made due to variations in the characteristics of the light emitting element that irradiates the toner with light and the light receiving element that receives the reflected light from the toner. There is a problem that it becomes impossible to measure the toner adhesion amount. That is, all the light emitting elements and the light receiving elements have some variations in characteristics, and variations in characteristics may occur due to changes over time due to use. Therefore, for example, if the characteristics of the light emitting element change, it becomes difficult to measure the toner adhesion amount with high accuracy, no matter how excellent the characteristics of the light receiving element. In such a case, even if the measuring device is constructed using expensive parts, it is difficult to detect the toner adhesion amount with high accuracy over the entire high density portion to the low density portion of the toner image.

Therefore, the toner adhesion amount measuring device according to the present invention is made in view of the above, and the toner adhesion amount measuring device is highly accurate regardless of variations in the characteristics of the parts constituting the toner adhesion amount measuring device. The purpose is to enable measurement of.

[0008]

In order to achieve the above object, a toner adhesion amount measuring device according to claim 1 of the present invention comprises:
A toner adhesion amount measuring device for measuring an adhesion amount of toner adhering to a surface of an intermediate transfer body, which transfers a developed toner image from a photoconductor, and transfers the transferred toner image onto a recording sheet. A first light emitting means for irradiating a first position on the surface with a first light; and a reflected light of the first light reflected by the toner adhering to the surface of the intermediate transfer member to receive the toner. Based on the reflection angle of the reflected light measured by the reflection angle measuring means, and the reflection angle of the reflected light of the first light, which changes according to the amount of adhered Toner adhesion amount determining means for determining the adhesion amount, second light emitting means for irradiating the second position on the surface of the intermediate transfer body with the second light, and reflection by the toner adhered to the surface of the intermediate transfer body Said second On the basis of the received light intensity measuring means for receiving the reflected light of the light and measuring the received light intensity of the reflected light of the second light, and the received light intensity of the reflected light of the second light measured by the received light intensity measuring means. Based on the emission intensity determined by the emission intensity determination unit for determining the emission intensity of the first emission unit, the rotation speed detection unit for detecting the rotation velocity of the intermediate transfer member, and the emission intensity determined by the emission intensity determination unit. Control means for controlling the light emission intensity of the first light emitting means, and for controlling the light emission timing of the first light emitting means based on the rotation speed of the intermediate transfer member detected by the rotation speed detecting means. , Are provided.

Further, in the toner adhesion amount measuring device according to the second aspect of the present invention, the developed toner image is transferred from the photoconductor, and the transferred toner image is transferred onto the surface of the intermediate transfer body which transfers the toner image onto the recording paper. In a toner adhesion amount measuring device for measuring an adhesion amount of adhered toner, a first light emitting unit for irradiating a first position on the surface of the intermediate transfer body with a first light, and a device for adhering to the surface of the intermediate transfer body. Reflection angle measuring means for receiving the reflection light of the first light reflected by the toner and measuring the reflection angle of the reflection light of the first light, which changes according to the amount of toner attached, Based on the reflection angle of the reflected light measured by the angle measuring means, the toner adhesion amount determining means for determining the adhesion amount of the toner, and the second light for the second position on the surface of the intermediate transfer member. Second light emitting means for irradiating A received light intensity measuring means for receiving the reflected light of the second light reflected by the toner attached to the surface of the intermediate transfer member and measuring the received light intensity of the reflected light of the second light; Light receiving gain determining means for determining the light receiving gain of the reflection angle measuring means based on the light receiving intensity of the reflected light of the second light measured by the means, and rotational speed detection for detecting the rotational speed of the intermediate transfer member. Means for controlling the light-receiving gain of the reflection angle measuring means based on the light-receiving gain determined by the light-receiving gain determining means, and based on the rotation speed of the intermediate transfer member detected by the rotation speed detecting means. Control means for controlling the light emission timing of the first light emitting means,
It is equipped with.

Further, in the toner adhesion amount measuring device according to the third aspect of the present invention, the developed toner image is transferred from the photoconductor, and the transferred toner image is transferred onto the surface of the intermediate transfer member. In a toner adhesion amount measuring device for measuring an adhesion amount of adhered toner, a first light emitting unit for irradiating a first position on the surface of the intermediate transfer body with a first light, and a device for adhering to the surface of the intermediate transfer body. Reflection angle measuring means for receiving the reflection light of the first light reflected by the toner and measuring the reflection angle of the reflection light of the first light, which changes according to the amount of toner attached, Based on the reflection angle of the reflected light measured by the angle measuring means, the toner adhesion amount determining means for determining the adhesion amount of the toner, and the second light for the second position on the surface of the intermediate transfer member. Second light emitting means for irradiating A received light intensity measuring means for receiving the reflected light of the second light reflected by the toner attached to the surface of the intermediate transfer member and measuring the received light intensity of the reflected light of the second light; Emission intensity determining means for determining the emission intensity of the first light emitting means based on the received light intensity of the reflected light of the second light measured by the means, and the second intensity measured by the light receiving intensity measuring means.
Light receiving gain determining means for determining the light receiving gain of the reflection angle measuring means, a rotational speed detecting means for detecting the rotational speed of the intermediate transfer member, and the light emitting intensity determining means based on the received light intensity of the reflected light of Controlling the light emission intensity of the first light emitting means based on the light emission intensity determined by
And controlling the light receiving gain of the reflection angle measuring means based on the light receiving gain determined by the light receiving gain determining means, and based on the rotation speed of the intermediate transfer member detected by the rotation speed detecting means, And a control means for controlling the light emission timing of the first light emitting means.

A toner adhesion amount measuring device according to a fourth aspect of the present invention is the toner adhesion amount measuring device according to any one of the first to third aspects, wherein the toner adhesion amount determining means measures the reflection angle. The toner adhesion amount is determined from the correspondence table on the basis of the reflection angle of the reflected light measured by the means.

A toner adhesion amount measuring device according to a fifth aspect of the present invention is the toner adhesion amount measuring device according to any one of the first to third aspects, wherein the toner adhesion amount determining means measures the reflection angle. The toner adhesion amount is calculated and determined based on the reflection angle of the reflected light measured by the means.

A toner adhesion amount measuring device according to a sixth aspect of the present invention is the toner adhesion amount measuring device according to the first or third aspect, wherein the emission intensity determining means is measured by the received light intensity measuring means. The light emission intensity of the light emitting means is determined from the correspondence table based on the received light intensity.

A toner adhesion amount measuring device according to a seventh aspect of the present invention is the toner adhesion amount measuring device according to the first or third aspect, wherein the light emission intensity determining means is measured by the light receiving intensity measuring means. The light emission intensity of the light emitting means is calculated and determined based on the received light intensity.

The toner adhesion amount measuring device according to claim 8 of the present invention is the toner adhesion amount measuring device according to claim 2 or 3, wherein the light receiving gain determining means is measured by the light receiving intensity measuring means. The light receiving gain of the reflection angle measuring means is determined from the correspondence table based on the light receiving intensity.

Further, a toner adhesion amount measuring device according to a ninth aspect of the present invention is the toner adhesion amount measuring device according to the second or third aspect, wherein the light receiving gain determining means is measured by the light receiving intensity measuring means. The light receiving gain of the reflection angle measuring means is calculated and determined based on the received light intensity.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a toner adhesion amount measuring device according to the present invention will be described with reference to the drawings, [First Embodiment], [Second Embodiment], [Third Embodiment] and [Embodiment]. 4]
Will be described in detail.

First Embodiment FIG. 1 is a configuration diagram showing a configuration of a copying machine in which a toner adhesion amount measuring device according to a first embodiment of the present invention is used. The configuration of the copying machine shown in FIG. 1 will be described below according to one copy cycle.

In the copying machine shown in FIG.
Is placed on the glass surface 102 and set in the copying machine by closing the original cover 101. Lamp 10
4, the original 103 is irradiated with light, and the mirrors 105, 10
The reflected light is input to the CCD 107 via the
The image of 3 is optically read. The image data read by the CCD 107 is converted from an analog signal to a digital signal by the A / D conversion circuit 108.
Subsequently, the image data is input to the document image processing unit 109 and subjected to predetermined image processing. Then, in the exposure operation value determination unit 110, the control value for exposure is determined,
Based on the control value, the exposure control unit 111 causes the writing optical system 1 to
12 is controlled to irradiate the photoconductor drum 113 with an optical image.

The photosensitive drum 113 has a drum driving section 13
5 and is uniformly charged by the charging device 114. By irradiating the above-mentioned optical image on the photosensitive drum 113, an electrostatic latent image is formed on the photosensitive drum. Next, the electrostatic latent image is visualized by the developing device 115 including the developing controller 116 and the toner replenishing controller 117. That is, a toner image is formed by adhering toner onto the photoconductor drum 113, and the electrostatic latent image is visualized. Then, the toner image on the photosensitive drum 113 is transferred from the photosensitive drum 113 to the intermediate transfer belt 119 of the intermediate transfer unit 118.

Photoreceptor drum 113 and intermediate transfer section 118
The paper feeding device 121 is interlocked with the operation of forming an image on the paper.
The recording paper is fed from. The sheet feeding device 121 is, for example, A
It is provided with a cassette 122 in which four size sheets are stored and a sheet feeding roller 123 for feeding recording sheets one by one.

The recording paper fed from the paper feeding device 121 is
The toner image on the intermediate transfer belt 119 is transferred to the transfer device 124 including a transfer roller. The intermediate transfer belt 119 is rotationally driven by the transfer belt drive unit 136. Subsequently, the recording paper is separated from the intermediate transfer belt 119 by the separating unit 125, and then is conveyed by the conveying belt driving unit 137.
The sheet is conveyed to the fixing device 128 by the conveying device 126 provided with. In the fixing device 128, the toner image is fixed on the recording paper. After that, the recording paper is discharged to the paper discharge tray 129.

Since the residual toner that has not been transferred to the recording paper remains on the intermediate transfer belt 119 on which the toner image is transferred to the recording paper, the belt cleaning device 130 removes the residual toner on the intermediate transfer belt 119. It Further, also on the photoconductor drum 113, since the residual toner not transferred to the intermediate transfer belt 119 remains, the cleaning device 131 removes the residual toner on the photoconductor drum 113. Subsequently, the entire surface exposure device 132 exposes the photoconductor drum 113, and the charges on the photoconductor drum 113 are removed. In this way, one copy cycle is completed.

A potential sensor 133 is provided on the surface of the photosensitive drum 113. This potential sensor 133
Thus, the potential on the photosensitive drum 113 is measured and the charging potential of the charging device 114 is controlled. An optical sensor 134 is also provided on the surface of the photosensitive drum 113. The optical sensor 134 includes, for example, an LED and a photodiode, as described in the related art. The optical sensor 134 is an LED, which is a photoconductor drum 113.
The toner adhered on the toner is irradiated with light, the reflected light reflected by the toner is received by a photodiode, and the toner adhesion amount on the photosensitive drum 113 is measured based on the intensity of the received reflected light. Is.

The toner adhesion amount measuring device 138 according to the present invention is provided on the surface of the intermediate transfer belt 119.
The configuration of the toner adhesion amount measuring device 138 according to the present invention will be described below with reference to FIG.

FIG. 2 is a configuration diagram showing the configuration of the toner adhesion amount measuring device 138 according to the first embodiment of the present invention. The toner adhesion amount measuring device 138 shown in FIG. 2 includes a laser light emitting element 200 as a light emitting means of the present invention for irradiating the measuring point 206 on the surface of the intermediate transfer belt 119 with laser light.
The PSD (reflection angle measuring means of the present invention for receiving the reflected light of the laser light reflected by the toner attached to the surface of the intermediate transfer belt 119 and measuring the reflected angle of the reflected light that changes according to the amount of toner attached Position S
an active device 201, a received light intensity measuring element 202 as a received light intensity measuring means of the present invention for receiving reflected light and measuring the received light intensity of the reflected light, and PSD2.
Based on the reflection angle of the reflected light measured by 01,
Determining the amount of toner attached and measuring the intensity of received light 2
Based on the received light intensity of the reflected light measured by 02,
The light emitting intensity of the laser light emitting element 200 is determined, and the light receiving gain of the PSD 201 is determined based on the light receiving intensity of the reflected light measured by the light receiving intensity measuring element 200, and the laser light emitting element is determined based on the determined light emitting intensity. Information processing as a toner adhesion amount determination means, a light emission intensity determination means, a light reception gain determination means and a control means of the present invention for controlling the light emission intensity of 201 and further controlling the light reception gain of PSD 201 based on the determined light reception gain. And unit 205.

The laser light emitting device 200, the PSD 201, and the received light intensity measuring device 202 are connected to the information processing unit 205 via the I / O control unit 204, respectively. The information processing unit 205 sends the received light intensity of the received light intensity measuring element 202 to the optimum light emitting intensity and PSD of the laser light emitting element 200.
Information for converting to the optimum light receiving gain of 201, P
An LUT (look-up table) (not shown) storing information for obtaining the toner adhesion amount from the reflection angle of the reflected light measured in SD201 is provided.

The reflected light is reflected by the beam splitter 203.
The light is branched into two directions by one, and one is received by the PSD 201 and the other is received by the received light intensity measuring element 202.

Further, as shown in FIG. 3, the information processing unit 20
5, the sheet feeding device 121, the transfer device 124, the potential sensor 133, the optical sensor 134, the drum drive unit 135, and the transfer belt drive unit 1 shown in FIG. 1 via the I / O control unit 204.
36 and the control information from the conveyor belt driving unit 137 are input.

Next, the procedure for measuring the toner adhesion amount by the toner adhesion amount measuring device shown in FIG. 2 will be described with reference to FIGS. 4 and 5. 4 and 5 are flowcharts showing the procedure for measuring the toner adhesion amount by the toner adhesion amount measuring device according to the first embodiment of the present invention.

First, referring to FIG. 4, the intermediate transfer belt 11
The intensity of the laser light from the laser light emitting element 200 reflected by the toner image formed on the light emitting element 9, that is, the intensity of the reflected light is measured, and the optimum light emission intensity of the laser light emitting element 200 and PS
A procedure for determining the light receiving gain of D201 will be described.

The information processing unit 205 determines whether or not to measure the intensity of the reflected light (S401). When measuring, the multi-tone test patch shown in FIG. 6 is transferred onto the intermediate transfer belt 119. , Start measuring the intensity of the reflected light.

In step S402, the information processing unit 2
05 obtains the timing of the intensity measurement of the reflected light from the I / O control unit 204, and irradiates the laser light onto the test patch transferred from the laser light emitting element 200 onto the intermediate transfer belt 119.

In step S403, the reflected light from the test patch is received by the received light intensity measuring element 202, and the information processing section 205 determines the optimum laser emission based on the received light intensity of the reflected light obtained from the received light intensity measuring element 202. Element 20
The LUT in which the light emission intensity of 0 and the light receiving gain of the PSD 201 are stored is referred to.

Subsequently, the information processing section 205 determines the optimum light emission intensity of the laser light emitting element 200 and the PSD 201 from the LUT.
The light receiving gain of is determined (S404). Then, it is determined whether or not the reflected light intensity measurement is to be ended (S405). When continuing the reflected light intensity measurement, the process returns to step S403 and the reflected light intensity measurement is continued.

Next, referring to FIG. 5, the laser light emitting element 2
A procedure of controlling the light emission intensity of 00 and the light receiving gain of the PSD 201 and measuring the toner adhesion amount will be described.

The information processing section 205 executes the procedure for measuring the reflected light quantity described with reference to FIG. 4 and at the same time, executes the procedure shown in FIG. First, in step S501, the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 determined in step S404 of FIG. 4 are read.

Then, the information processing section 205 controls the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 based on the determined light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, and uses the PSD 201 to control the laser. The reflection angle of the reflected light of the laser light emitted from the light emitting element 200 is measured (S502).

In step S503, the information processing unit 2
Reference numeral 05 refers to the LUT based on the reflection angle of the reflected light measured by the PSD 201, determines the toner adhesion amount on the intermediate transfer belt 119, and stores the determined toner adhesion amount.

After that, the information processing section 205 determines whether or not the measurement of the toner adhesion amount is to be ended (S504), and in the case of further measuring the toner adhesion amount, step S502.
Then, the toner adhesion amount is measured. When the measurement of the toner adhesion amount is finished, the operation of the laser light emitting element 200 is stopped in step S505.

As described with reference to FIGS. 4 and 5, the optimum output of the laser light emitting element 200 is determined by using the received light intensity of the reflected light measured by the light receiving intensity measuring element 202, and the laser light emitting element is determined based on this result. By controlling the light emission intensity of 200, the PSD 201 can measure the toner adhesion amount with high accuracy.

Further, the optimum light receiving gain of the PSD 201 is determined by using the light receiving intensity of the reflected light measured by the light receiving intensity measuring element 202, and the light receiving gain of the PSD 201 is controlled based on this result to obtain the optimum sensitivity. The reflection angle of the reflected light can be measured, and the toner adhesion amount can be measured with high accuracy.

Further, by controlling both the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, the toner adhesion amount can be measured with higher accuracy.

In the first embodiment, both the light emission intensity of the laser light emitting device 200 and the light receiving gain of the PSD 201 are controlled, but it is sufficiently accurate to control only one of them. It is possible to measure the amount of adhered toner.

Further, in the first embodiment, in order to determine the light emission intensity of the laser light emitting element 200, the light receiving gain of the PSD 201 and the toner adhesion amount, the information processing unit 205 is set to L.
Although the UT is provided, the information processing unit 205 may be configured to determine these by calculating the light emission intensity of the laser light emitting element 200, the light receiving gain of the PSD 201, and the toner adhesion amount. In this case, the amount of memory used can be reduced and a finer control value can be obtained.

Further, the number of gradations of the test patch and the arrangement of the patterns used for measuring the toner adhesion amount are not limited to those shown in FIG. 6, and a test patch having an arbitrary number of gradations and a pattern may be used as long as there is no problem in specifying. You can

[Second Embodiment] FIG. 7 is a block diagram showing a structure of a copying machine in which a toner adhesion amount measuring device according to a second embodiment of the present invention is used. FIG. 6 is a configuration diagram showing a configuration of a toner adhesion amount measuring device 138 according to mode 2. FIG. 7 and 8, the same components as those shown in FIGS. 1 and 2 described in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Toner adhesion amount measuring device 138 according to the present invention
Are provided on the surface of the intermediate transfer belt 119 as in the first embodiment. As is clear from FIGS. 7 and 8, in the toner adhesion amount measuring device 138 of the second embodiment, the toner adhesion amount is measured using two measurement points 802 and 803. The configuration of the toner adhesion amount measuring device 138 according to the present invention will be described with reference to FIG.

A toner adhesion amount measuring device 138 shown in FIG.
Is a laser light emitting element 200 as the first light emitting means of the present invention for irradiating the measurement point 803 on the surface of the intermediate transfer belt 119 with the first light (laser light), and the intermediate transfer belt 1
19 Reflection angle measuring means of the present invention, which receives the reflected light of the first light reflected by the toner adhering to the surface, and measures the reflection angle of the reflected light of the first light which changes according to the amount of adhering toner. PSD 201 as an intermediate transfer belt 11
9. A light emitting element 800 as the second light emitting means of the present invention for irradiating the measuring point 802 on the surface 9 with the second light, and the reflection of the second light reflected by the toner adhering to the surface of the intermediate transfer belt 119. A light receiving intensity measuring element 801 as light receiving intensity measuring means of the present invention for receiving light and measuring the light receiving intensity of the reflected light of the second light, and toner adhesion based on the reflection angle of the reflected light measured by PSD 201. The second amount measured by the received light intensity measuring element 801 is determined based on the received light intensity of the reflected light of the second light measured by the received light intensity measuring element 801 while determining the amount. The light receiving gain of the PSD 201 is determined based on the light receiving intensity of the reflected light of the light, and the light emitting intensity of the laser light emitting element 200 is controlled based on the determined light emitting intensity. Based on the light-receiving gain PSD201
The toner adhesion amount determining means, the light emission intensity determining means, the light receiving gain determining means, and the information processing section 205 as the controlling means of the present invention for controlling the light receiving gain are included.

The laser light emitting device 200, the PSD 201, the light emitting device 800, and the received light intensity measuring device 801 are connected to the information processing unit 205 via the I / O control unit 204. The information processing unit 205 includes information for converting the received light intensity measured by the received light intensity measuring element 801 into the optimum light emitting intensity of the laser light emitting element 200 and the optimum light receiving gain of the PSD 201, and the reflected light measured by the PSD 201. An LUT (look-up table) (not shown) in which information and the like for obtaining the toner adhesion amount from the reflection angle is stored.

The light emitting element 800 and the received light intensity measuring element 801 are used only for measuring the amount of light reflected from the toner image at the measuring point 802. Therefore, when mounting, inexpensive components such as LEDs and photodiodes can be used. On the other hand, the laser light emitting element 200 and the PSD 201 are
03 is used to measure the toner adhesion amount. Further, the laser light emitting element 200 and the PSD 201 are such that the light emitting intensity and the light receiving gain are controlled by the information processing unit 205 based on the light receiving intensity of the reflected light obtained by the light receiving intensity measuring element 801.

Next, the procedure for measuring the toner adhesion amount by the toner adhesion amount measuring device shown in FIG. 8 will be described with reference to FIGS. 9 and 10. 9 and 10 show the second embodiment of the present invention.
5 is a flowchart showing a procedure for measuring the toner adhesion amount by the toner adhesion amount measuring device according to the first embodiment.

First, referring to FIG. 9, the intermediate transfer belt 11
9. Light emitting element 800 reflected by the toner image formed on
A procedure for measuring the intensity of the light from the above, that is, the intensity of the reflected light and determining the optimal emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 will be described.

The information processing unit 205 determines whether or not to measure the intensity of the reflected light (S901). When measuring, the multi-tone test patch shown in FIG. 6 is transferred onto the intermediate transfer belt 119. , Start measuring the intensity of the reflected light.

In step S902, the information processing unit 2
In 05, the timing of intensity measurement of the reflected light is obtained from the I / O control unit 204, and light is emitted from the light emitting element 800 onto the measurement point 802, that is, the test patch transferred onto the intermediate transfer belt 119.

In step S903, the reflected light from the test patch is received by the received light intensity measuring element 801, and the information processing section 205 determines the optimum laser emission based on the received light intensity of the reflected light obtained from the received light intensity measuring element 801. Element 20
The LUT in which the light emission intensity of 0 and the light receiving gain of the PSD 201 are stored is referred to.

Subsequently, the information processing section 205 determines the optimum light emission intensity of the laser light emitting element 200 and the PSD 201 from the LUT.
The light receiving gain of is determined (S904). Then, it is determined whether or not the reflected light intensity measurement is to be ended (S905). If the reflected light intensity measurement is to be continued, the process returns to step S903 to continue the reflected light intensity measurement.

Next, the procedure for controlling the light emission intensity of the laser light emitting device 200 and the light receiving gain of the PSD 201 and measuring the toner adhesion amount will be described with reference to FIG.

The information processing section 205 executes the procedure for measuring the amount of reflected light described with reference to FIG. 9 and, at the same time, executes the procedure shown in FIG. First, in step S1001, FIG.
The light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, which are determined in step S904, are read.

Then, the information processing unit 205 controls the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 based on the determined light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, and uses the PSD 201 to control the laser. The reflection angle of the reflected light of the laser light emitted from the light emitting element 200 to the measurement point 803 is measured (S100).
2).

In step S1003, the information processing unit 205 determines the toner adhesion amount on the intermediate transfer belt 119 by referring to the LUT based on the reflection angle of the reflected light measured by the PSD 201, and determines the determined toner adhesion amount. save.

Thereafter, the information processing section 205 determines whether or not the measurement of the toner adhesion amount is to be ended (S1004), and in the case of further measuring the toner adhesion amount, step S10.
Returning to 02, the toner adhesion amount is measured. When the measurement of the toner adhesion amount is finished, the operation of the light emitting element 800 is stopped in step S1005.

As described with reference to FIGS. 9 and 10,
The optimum output of the laser light emitting element 200 is determined using the received light intensity of the reflected light measured by the light receiving intensity measuring element 801, and the light emitting intensity of the laser light emitting element 200 is controlled based on this result, so that the PSD 201 achieves high accuracy. It is possible to measure the amount of adhered toner.

Further, the optimum light receiving gain of the PSD 201 is determined by using the light receiving intensity of the reflected light measured by the light receiving intensity measuring element 801, and the light receiving gain of the PSD 201 is controlled based on this result to obtain the optimum sensitivity. The reflection angle of the reflected light can be measured, and the toner adhesion amount can be measured with high accuracy.

Further, by controlling both the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, the toner adhesion amount can be measured with higher accuracy.

In the second embodiment, both the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 are controlled, but it is sufficiently accurate to control only one of them. It is possible to measure the amount of adhered toner.

Further, in the second embodiment, in order to determine the light emission intensity of the laser light emitting element 200, the light receiving gain of the PSD 201 and the toner adhesion amount, the information processing unit 205 is set to L
Although the UT is provided, the information processing unit 205 may be configured to determine these by calculating the light emission intensity of the laser light emitting element 200, the light receiving gain of the PSD 201, and the toner adhesion amount. In this case, the amount of memory used can be reduced and a finer control value can be obtained.

Further, in the second embodiment, the light emitting element 800, the received light intensity measuring element 801, and the laser light emitting element 2 are used.
00 and PSD 201 are provided, the number of parts is increased as compared with the first embodiment.
Since inexpensive components such as a photodiode can be used for the light emitting element 800 and the received light intensity measuring element 801, the device can be constructed at a lower cost than the device according to the embodiment.

[Third Embodiment] FIG. 11 is a configuration diagram showing a configuration of a toner adhesion amount measuring device 138 according to a third embodiment of the present invention. Note that FIG.
In FIG. 8, the same components as those shown in FIG. 8 described in the second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Toner adhesion amount measuring device 138 according to the present invention
Is provided on the surface of the intermediate transfer belt 119 as in the second embodiment, and the toner adhesion amount is measured using two measurement points 802 and 803. The configuration of the toner adhesion amount measuring device 138 according to the present invention will be described with reference to FIG.

Toner adhesion amount measuring device 138 shown in FIG.
In addition to the configuration of the second embodiment,
The synchronization detecting unit 1100 is provided as the rotation speed detecting means of the present invention for detecting the rotation speed of the. This synchronization detector 1
As shown in FIGS. 11 and 12, 100 is connected to the information processing unit 205 via the I / O control unit 204.
As a result, the information processing unit 205 determines that the intermediate transfer belt 119
You can know the movement of. The synchronization detection unit 1100 is provided by the light emitting element 800 and the light receiving amount measuring element 801 even when the intermediate transfer belt 119 has uneven rotation and cannot be considered to rotate at a uniform speed. Laser light emitting device 200 obtained from measurement result of reflected light amount
This is in order to accurately reflect the light emission intensity of and the light receiving gain of the PSD 201 in the toner adhesion amount measurement.

The operation of the toner adhesion amount measuring device 138 of the third embodiment will be described. In addition, the reflected light intensity measurement,
Since the toner adhesion amount measurement and the like are as shown in FIGS. 9 and 10 described in the second embodiment, detailed description thereof will be omitted.

The measurement of the toner adhesion amount of the test patch 600, which is one of the test patches shown in FIG. 6, will be described as an example. This test patch 600 has the measurement points 8 shown in FIG.
When it reaches 02, the reflected light intensity for the test patch 600 is measured at the measurement point 802. Sync detector 1100
Since information regarding the rotation of the intermediate transfer belt 119 is input to the information processing unit 205 from the
Is the test patch 60 from the measurement point 802 to the measurement point 803.
You can know the time when 0 arrives. Therefore, the information processing unit 205 determines that the test patch 600 has the measurement points 803.
Laser light emitting element 200 in accordance with the timing of passing through
Control the light emission intensity of the PSD and the light receiving gain of the PSD 201, and irradiate the laser light from the laser light emitting element 200,
The SD 201 receives the reflected light and measures the toner adhesion amount.

Since the synchronization detecting section 1100 is provided in this way, even if the intermediate transfer belt 119 rotates unevenly, the light emitting element 800 and the received light intensity measuring element 8 can be used.
The control of the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 with respect to the test patch 600 obtained by the measurement of 01 can be accurately reflected in the toner adhesion amount measurement.

[Fourth Embodiment] FIG. 13 is a configuration diagram showing a configuration of a toner adhesion amount measuring device 138 according to a fourth embodiment of the present invention. Note that FIG.
In the above, the same components as those described in the first to third embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

Toner adhesion amount measuring device 138 shown in FIG.
Is a laser light emitting element 200 as a light emitting means of the present invention for irradiating the measurement point 1300 on the surface of the intermediate transfer belt 119 with the first light (laser light), and the intermediate transfer belt 119.
As reflection angle measuring means of the present invention, which receives the reflected light of the first light reflected by the toner adhering to the surface and measures the reflection angle of the reflected light of the first light that changes according to the amount of toner adhering Of the PSD 201 and the surface of the photosensitive drum 113, irradiates the surface of the photosensitive drum 113 with the second light, and receives the reflected light of the second light reflected by the toner adhering to the surface of the photosensitive drum 113. Then, the optical sensor 134 as the received light intensity measuring means of the present invention for measuring the received light intensity of the reflected light of the second light, the synchronization detection unit 1100 for detecting the rotation speed of the intermediate transfer belt 119, and the PSD 201.
The amount of adhered toner is determined based on the reflection angle of the reflected light measured by the laser light emitting element 20 based on the received light intensity measured by the optical sensor 134.
The light emission intensity of 0 is determined, the light reception gain of the PSD 201 is determined based on the light reception intensity measured by the optical sensor 134, the light emission intensity of the laser light emitting element 200 is controlled based on the determined light emission intensity, and An information processing unit 20 as a toner adhesion amount determination means, a light emission intensity determination means, a light reception gain determination means, and a control means of the present invention that controls the light reception gain of the PSD 201 based on the determined light reception gain.
5 and.

The laser light emitting element 200, the PSD 201 and the optical sensor 134 are connected to the information processing section 205 via the I / O control section 204. In the information processing unit 205, the received light intensity measured by the optical sensor 134 is
Optimum emission intensity of the laser light emitting device 200 and PSD20
Information for converting to the optimum light-receiving gain of 1 and PSD
An LUT (look-up table) (not shown) in which information and the like for obtaining the toner adhesion amount from the reflection angle of the reflected light measured in 201 is stored.

Further, in the first to third embodiments, the received light intensity measuring element 202 or 801 is used to measure the intensity of the reflected light from the toner, but in the fourth embodiment,
The output of the optical sensor 134 provided on the surface of the photosensitive drum 113 shown in FIGS. 1 and 7 is used. As a result, the number of parts can be reduced and the cost of the device can be reduced.

Next, the procedure for measuring the toner adhesion amount by the toner adhesion amount measuring device shown in FIG. 13 will be described with reference to FIGS. 14 and 15. 14 and 15 are flowcharts showing the procedure for measuring the toner adhesion amount by the toner adhesion amount measuring device according to the first embodiment of the present invention.

First, referring to FIG. 14, a procedure for measuring the amount of laser light from the laser light emitting element 200 reflected by the toner image, that is, the amount of reflected light will be described.

The information processing unit 205 determines whether or not to measure the amount of reflected light (S1401), reads the developed toner image on the photosensitive drum 113, that is, the test patch shown in FIG. The received light intensity of the reflected light is stored (S1402). Then, the test patch is transferred onto the intermediate transfer belt 119.

In step S1403, the information processing section 205 determines the light emission intensity of the laser light emitting element 200 and P based on the light reception intensity of the reflected light obtained from the optical sensor 134.
Referring to the LUT in which the light receiving gain of SD201 is stored,
Optimum emission intensity of laser light emitting device 200 and PSD 20
Determine the light-receiving gain of 1

Then, it is determined whether or not the reflected light intensity measurement is to be ended (S1404). When continuing the reflected light intensity measurement, the process returns to step S1402 and the reflected light intensity measurement is continued.

Next, the procedure for controlling the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 and measuring the toner adhesion amount will be described with reference to FIG.

The information processing section 205 executes the procedure for measuring the amount of reflected light described with reference to FIG. 14, and at the same time, executes the procedure shown in FIG. First, in step S1501, the laser light emitting element 2 determined in step S1403 of FIG.
The light emission intensity of 00 and the light receiving gain of PSD 201 are read.

Then, the information processing section 205 controls the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 based on the determined light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, and uses the PSD 201 to control the laser. The reflection angle of the reflected light of the laser light emitted from the light emitting element 200 to the measurement point 1300 is measured (S15).
02). Note that the information processing unit 205 includes the drum driving unit 13
5 and the information on the movements of the photoconductor drum 113 and the intermediate transfer belt 119 are input from the synchronization detection unit 1100, the time required for the toner image read by the optical sensor 134 to reach the measurement point 1300 shown in FIG. I can know. Therefore, the information processing unit 205 can measure the toner adhesion amount when the toner image read by the optical sensor 134 reaches the measurement point.

In step S1503, the information processing section 205 refers to the LUT based on the reflection angle of the reflected light measured by the PSD 201, determines the toner adhesion amount on the intermediate transfer belt 119, and determines the determined toner adhesion amount. save.

After that, the information processing section 205 determines whether or not the measurement of the toner adhesion amount is to be ended (S1504), and in the case of further measuring the toner adhesion amount, step S15.
Returning to 02, the toner adhesion amount is measured. When the measurement of the toner adhesion amount is finished, the operation of the laser light emitting element 200 is stopped in step S1505.

As described with reference to FIGS. 14 and 15, the optimum output of the laser light emitting element 200 is determined by using the received light intensity of the reflected light measured by the optical sensor 134, and based on this result, the laser light emitting element 200 By controlling the emission intensity, the PSD 201 can measure the toner adhesion amount with high accuracy.

Further, the optimum light receiving gain of the PSD 201 is determined by using the light receiving intensity of the reflected light measured by the optical sensor 134, and the light receiving gain of the PSD 201 is controlled based on this result, so that the reflected light with the optimum sensitivity is obtained. It is possible to measure the reflection angle of the toner and the toner adhesion amount can be measured with high accuracy.

Further, by controlling both the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201, the toner adhesion amount can be measured with higher accuracy.

In the fourth embodiment, both the light emission intensity of the laser light emitting element 200 and the light receiving gain of the PSD 201 are controlled, but it is sufficiently accurate to control only one of them. It is possible to measure the amount of adhered toner.

Further, in the fourth embodiment, in order to determine the light emission intensity of the laser light emitting element 200, the light receiving gain of the PSD 201 and the toner adhesion amount, the information processing unit 205 is set to L
Although the UT is provided, the information processing unit 205 may be configured to determine these by calculating the light emission intensity of the laser light emitting element 200, the light receiving gain of the PSD 201, and the toner adhesion amount. In this case, the amount of memory used can be reduced and a finer control value can be obtained.

In the fourth embodiment, since the optical sensor 134 provided on the surface of the photosensitive drum 113 is used for measuring the light quantity of the reflected light from the toner image, the light receiving intensity measuring elements 202, 801 and the beam splitter 203, etc. Can be omitted, and an inexpensive toner adhesion amount measuring device can be obtained. In reality, the transfer rates when the toner image is transferred between the photoconductor drum 113 and the intermediate transfer belt are not always the same, and the toner adhesion amount when the reflected light amount is measured and the toner adhesion amount when the toner adhesion amount is measured are measured. Although it may be different from the adhesion amount, if the fluctuation of the transfer rate is so small that it can be ignored, or if the information processing unit 205 can sufficiently absorb the fluctuation of the transfer rate, the apparatus of the fourth embodiment has a low cost. This is an effective method that can achieve high efficiency and can measure the toner adhesion amount with high accuracy. Furthermore, when the measurement system is stable enough to regard the time from the measurement point of the reflected light amount by the optical sensor 134 to the measurement point of the toner adhesion amount shown in FIG. 13 as a constant,
The synchronization detector 1100 can also be omitted, and the cost can be further reduced.

[0095]

As described above, according to the toner adhesion amount measuring device (Claim 1) of the present invention, the second position for irradiating the second position on the surface of the intermediate transfer member is irradiated with the second light. And a light-receiving intensity measuring unit for receiving the reflected light of the second light reflected by the toner attached to the surface of the intermediate transfer member and measuring the received light intensity of the reflected light of the second light. A light emission intensity determining means for determining the light emission intensity of the first light emitting means based on the received light intensity of the reflected light of the second light measured by the means, and a rotation speed detecting means for detecting the rotation speed of the intermediate transfer member. Controlling the light emission intensity of the first light emitting means based on the light emission intensity determined by the light emission intensity determining means, and the first light emission based on the rotation speed of the intermediate transfer member detected by the rotation speed detecting means. Control for controlling the light emission timing of the means Due to a structure and a stage, even if there are variations in the characteristics of components constituting the toner adhesion amount measuring device, it is possible to allow the measurement of higher accuracy toner adhesion amount with an inexpensive configuration.

Further, according to the toner adhesion amount measuring device (claim 2) of the present invention, the second light emitting means for irradiating the second position on the surface of the intermediate transfer member with the second light, and the intermediate A received light intensity measuring means for receiving the reflected light of the second light reflected by the toner attached to the surface of the transfer body and measuring the received light intensity of the reflected light of the second light; Based on the received light intensity of the reflected light of the second light, the light receiving gain determining means for determining the light receiving gain of the reflection angle measuring means, the rotational speed detecting means for detecting the rotational speed of the intermediate transfer member, and the light receiving gain determining means. The light receiving gain of the reflection angle measuring means is controlled based on the received light receiving gain,
In addition, the control means controls the light emission timing of the first light emitting means based on the rotation speed of the intermediate transfer member detected by the rotation speed detection means. It is possible to measure the toner adhesion amount with higher accuracy with an inexpensive configuration even if there is a variation in the toner amount.

According to the toner adhesion amount measuring device (claim 3) of the present invention, the second light emitting means for irradiating the second position on the surface of the intermediate transfer member with the second light, and the intermediate A received light intensity measuring means for receiving the reflected light of the second light reflected by the toner attached to the surface of the transfer body and measuring the received light intensity of the reflected light of the second light; Based on the received light intensity of the reflected light of the second light, the emitted light intensity determining means for determining the emitted light intensity of the first light emitting means, and the received light intensity of the reflected light of the second light measured by the received light intensity measuring means Based on the light emission intensity determined by the light emission intensity determination unit, the light reception gain determination unit that determines the light reception gain of the reflection angle measurement unit, the rotation speed detection unit that detects the rotation speed of the intermediate transfer member, and the first emission intensity determination unit. It controls the intensity of light emitted by the light emitting means. The first light emitting means controls the light receiving gain of the reflection angle measuring means on the basis of the light receiving gain determined by the light receiving gain determining means, and the first light emitting means on the basis of the rotation speed of the intermediate transfer member detected by the rotation speed detecting means. Since it is configured to include a control unit that controls the light emission timing of the toner adhesion amount measurement device, it is possible to measure the toner adhesion amount more accurately with an inexpensive structure, even if there are variations in the characteristics of the components that make up the toner adhesion amount measurement device. can do.

Further, according to the toner adhesion amount measuring device (claim 4) of the present invention, in the toner adhesion amount measuring device according to any one of claims 1 to 3, the toner adhesion amount determining means has a reflection angle. Since the toner adhesion amount is determined from the correspondence table based on the reflection angle of the reflected light measured by the measuring means, the toner adhesion amount can be obtained very easily and accurately.

Further, according to the toner adhesion amount measuring device (claim 5) of the present invention, in the toner adhesion amount measuring device according to any one of claims 1 to 3, the toner adhesion amount determining means has a reflection angle. Since the toner adhesion amount is calculated and determined based on the reflection angle of the reflected light measured by the measuring means, the memory can be effectively used and the cost of the apparatus can be reduced.

Further, according to the toner adhesion amount measuring device (claim 6) of the present invention, in the toner adhesion amount measuring device according to claim 1 or 3, the emission intensity determining means is the light reception intensity measuring means. Based on the measured received light intensity,
Since the light emission intensity of the light emitting means is determined from the correspondence table, the light emission intensity of the light emitting means can be obtained very easily and accurately, and the toner adhesion amount can be measured with higher accuracy.

Further, according to the toner adhesion amount measuring device (claim 7) of the present invention, in the toner adhesion amount measuring device according to claim 1 or 3, the emission intensity determining means is the light reception intensity measuring means. Based on the measured received light intensity,
Since the light emission intensity of the light emitting unit is calculated and determined, the memory can be effectively used, the cost of the device can be reduced, and the toner adhesion amount can be measured with high accuracy.

Further, according to the toner adhesion amount measuring device (claim 8) of the present invention, in the toner adhesion amount measuring device according to claim 2 or 3, the light receiving gain determining means measures by the light receiving intensity measuring means. Based on the received light intensity
Since the light receiving gain of the reflection angle measuring means is determined from the correspondence table, the light receiving gain of the reflection angle measuring means can be obtained very easily and accurately, and the toner adhesion amount can be measured with higher accuracy. You can

Further, according to the toner adhesion amount measuring device (claim 9) of the present invention, in the toner adhesion amount measuring device according to claim 2 or 3, the light receiving gain determining means measures by the light receiving intensity measuring means. Based on the received light intensity
Since the light receiving gain of the reflection angle measuring means is calculated and determined, the memory can be effectively used, the cost of the apparatus can be reduced, and the toner adhesion amount can be measured with high accuracy. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a copying machine in which a toner adhesion amount measuring device according to a first embodiment of the present invention is used.

FIG. 2 is a configuration diagram showing a configuration of a toner adhesion amount measuring device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a toner adhesion amount measuring device according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure for measuring a toner adhesion amount by the toner adhesion amount measuring device according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a procedure for measuring a toner adhesion amount by the toner adhesion amount measuring device according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a test patch transferred to the intermediate transfer belt when measuring the toner adhesion amount by the toner adhesion amount measuring device according to the first embodiment of the present invention.

FIG. 7 is a configuration diagram showing a configuration of a copying machine in which a toner adhesion amount measuring device according to a second embodiment of the present invention is used.

FIG. 8 is a configuration diagram showing a configuration of a toner adhesion amount measuring device according to a second embodiment of the present invention.

FIG. 9 is a flowchart showing a procedure for measuring a toner adhesion amount by the toner adhesion amount measuring device according to the second embodiment of the present invention.

FIG. 10 is a flowchart showing a procedure for measuring a toner adhesion amount by the toner adhesion amount measuring device according to the second embodiment of the present invention.

FIG. 11 is a configuration diagram showing a configuration of a toner adhesion amount measuring device according to a third embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a toner adhesion amount measuring device according to a third embodiment of the present invention.

FIG. 13 is a configuration diagram showing a configuration of a toner adhesion amount measuring device according to a fourth embodiment of the present invention.

FIG. 14 is a flowchart showing a procedure for measuring a toner adhesion amount by the toner adhesion amount measuring device according to the fourth embodiment of the present invention.

FIG. 15 is a flowchart showing a procedure for measuring a toner adhesion amount by the toner adhesion amount measuring device according to the fourth embodiment of the present invention.

[Explanation of symbols]

101 Original cover 102 glass surface 103 manuscript 104 lamp 105,106 mirror 107 CCD 108 A / D conversion circuit 109 Original image processing unit 110 Exposure operation value determination unit 111 Exposure control unit 112 writing optical system 113 photoconductor drum 114 charging device 115 developing device 116 Development control unit 117 Toner Supply Control Section 118 Intermediate transfer unit 119 Intermediate transfer belt 121 paper feeder 122 cassettes 123 Paper feed roller 124 Transfer device 125 separation section 126 Conveyor 127 conveyor belt 128 fixing device 129 Output tray 130 Belt cleaning device 131 Cleaning device 132 Full exposure device 133 potential sensor 134 Optical sensor 135 drum drive 136 Transfer belt drive unit 137 Conveyor belt drive 138 Toner adhesion amount measuring device 200 Laser emitting element 201 PSD 202 Light receiving intensity measuring element 203 beam splitter 204 I / O controller 205 Information processing unit 206 measurement points 600 test patch 800 light emitting device 801 Received light intensity measurement element 802,803 Measuring points 1100 Sync detector 1300 measurement points

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Claims (9)

(57) [Claims] 1. A toner adhering amount measuring device for measuring an adhering amount of toner adhering to a surface of an intermediate transfer member for transferring a developed toner image from a photosensitive member and transferring the transferred toner image onto a recording sheet. A first light emitting means for irradiating a first position on the surface of the intermediate transfer body with a first light; and a reflected light of the first light reflected by the toner attached to the surface of the intermediate transfer body. Reflection angle measuring means for measuring the reflection angle of the reflected light of the first light that is received and changes according to the amount of toner attached, and based on the reflection angle of the reflected light measured by the reflection angle measuring means The toner adhesion amount determining means for determining the toner adhesion amount, the second light emitting means for irradiating the second position on the intermediate transfer body surface with the second light, and the intermediate transfer body surface. If the toner adheres, A received light intensity measuring means for receiving the reflected light of the reflected second light and measuring a received light intensity of the reflected light of the second light; and a reflection of the second light measured by the received light intensity measuring means. Based on the received light intensity of light, the light emission intensity determining means for determining the light emission intensity of the first light emitting means, the rotation speed detecting means for detecting the rotation speed of the intermediate transfer member, and the light emission intensity determining means. The light emission intensity of the first light emitting means based on the light emission intensity of the first light emitting means, and the light emission timing of the first light emitting means based on the rotation speed of the intermediate transfer member detected by the rotation speed detecting means. A toner adhering amount measuring device, comprising: 2. A toner adhesion amount measuring device for measuring the adhesion amount of toner adhering to the surface of an intermediate transfer member, which transfers a developed toner image from a photoconductor, and transfers the transferred toner image onto recording paper. A first light emitting means for irradiating a first position on the surface of the intermediate transfer body with a first light; and a reflected light of the first light reflected by the toner attached to the surface of the intermediate transfer body. Reflection angle measuring means for measuring the reflection angle of the reflected light of the first light that is received and changes according to the amount of toner attached, and based on the reflection angle of the reflected light measured by the reflection angle measuring means The toner adhesion amount determining means for determining the toner adhesion amount, the second light emitting means for irradiating the second position on the intermediate transfer body surface with the second light, and the intermediate transfer body surface. If the toner adheres, A received light intensity measuring means for receiving the reflected light of the reflected second light and measuring a received light intensity of the reflected light of the second light; and a reflection of the second light measured by the received light intensity measuring means. Based on the received light intensity of the light, the light receiving gain determining means for determining the light receiving gain of the reflection angle measuring means, the rotational speed detecting means for detecting the rotational speed of the intermediate transfer member, and the light receiving gain determining means. The light receiving gain of the reflection angle measuring means is controlled based on the light receiving gain, and the light emission timing of the first light emitting means is controlled based on the rotation speed of the intermediate transfer member detected by the rotation speed detecting means. And a control unit for controlling the toner adhesion amount measuring device. 3. A toner adhering amount measuring device for measuring an adhering amount of toner adhering to a surface of an intermediate transfer member for transferring a developed toner image from a photoconductor and transferring the transferred toner image onto a recording sheet. A first light emitting means for irradiating a first position on the surface of the intermediate transfer body with a first light; and a reflected light of the first light reflected by the toner attached to the surface of the intermediate transfer body. Reflection angle measuring means for measuring the reflection angle of the reflected light of the first light that is received and changes according to the amount of toner attached, and based on the reflection angle of the reflected light measured by the reflection angle measuring means The toner adhesion amount determining means for determining the toner adhesion amount, the second light emitting means for irradiating the second position on the intermediate transfer body surface with the second light, and the intermediate transfer body surface. If the toner adheres, A received light intensity measuring means for receiving the reflected light of the reflected second light and measuring a received light intensity of the reflected light of the second light; and a reflection of the second light measured by the received light intensity measuring means. On the basis of the received light intensity of light, based on the received light intensity of the second light reflected by the second light measured by the light emitting intensity determining means for determining the light emitting intensity of the first light emitting means, Based on the light emission intensity determined by the light emission intensity determination unit, the light reception gain determination unit that determines the light reception gain of the reflection angle measurement unit, the rotation speed detection unit that detects the rotation speed of the intermediate transfer member, and the light emission intensity determined by the light emission intensity determination unit. 1 controls the light emission intensity of the light emitting means, and controls the light receiving gain of the reflection angle measuring means based on the light receiving gain determined by the light receiving gain determining means. Based on the rotational speed of the intermediate transfer body that is detected by the toner adhesion amount measuring device, characterized in that it comprises a control means for controlling the light emission timings of said first light emitting means. 4. The toner adhesion amount measuring device according to claim 1, wherein the toner adhesion amount determining means is based on a reflection angle of the reflected light measured by the reflection angle measuring means, A toner adhesion amount measuring device characterized by determining a toner adhesion amount from a correspondence table. 5. The toner adhesion amount measuring device according to claim 1, wherein the toner adhesion amount determining means is based on a reflection angle of the reflected light measured by the reflection angle measuring means, A toner adhesion amount measuring device, characterized in that the toner adhesion amount is calculated and determined. 6. The toner adhesion amount measuring device according to claim 1, wherein the light emission intensity determining unit determines the light emitting unit from the correspondence table based on the light receiving intensity measured by the light receiving intensity measuring unit. A toner adhesion amount measuring device characterized in that it determines emission intensity. 7. The toner adhesion amount measuring device according to claim 1, wherein the light emission intensity determining means determines the light emission intensity of the light emitting means based on the light receiving intensity measured by the light receiving intensity measuring means. A toner adhesion amount measuring device characterized by being calculated and determined. 8. The toner adhesion amount measuring device according to claim 2 or 3, wherein the light receiving gain determining means measures the reflection angle from the correspondence table based on the light receiving intensity measured by the light receiving intensity measuring means. A toner adhesion amount measuring device characterized by determining a light receiving gain of the means. 9. The toner adhesion amount measuring device according to claim 2 or 3, wherein the light receiving gain determining means receives light of the reflection angle measuring means based on the light receiving intensity measured by the light receiving intensity measuring means. A toner adhesion amount measuring device characterized in that a gain is calculated and determined.