JPH11313492A - Temperature-detecting device, control device of vibration wave device, vibration wave-driving device, and image-forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize a vibration wave device and to detect ambient temperature by uniquely determining the ambient temperature of the vibration wave device according to the relationship between the drive frequency and the setting speed of the vibrational wave device being driven. SOLUTION: According to the temperature detection result of a temperature sensor 101, equipment 103 for selecting speed accesses a table 102 where the speed is set for each temperature for selecting the proper speed. Based on a selected frequency, a driving frequency is controlled by a controller 104 for adjusting speed, a bi-phase drive pulse is outputted to boosters 105a and 105b, and a vibration wave motor 106 is driven. The speed of the vibration wave motor 106 is detected by a speed detector 107, and the detection result is sent to a comparator 108. The comparator 108 compares the detection value of the speed detector 107 with the value of the selection equipment 103, and performs feedback control for inputting the speed difference of the frequency to the controller 104. The drive frequency is readjusted by the speed difference which is selected by the detector 103 to match the speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration wave driving device having a vibration wave device such as a vibration wave motor as a driving source, and an image forming apparatus such as a copying machine or a printer.

[0002]

2. Description of the Related Art A vibration wave device such as a vibration wave motor applies a frequency voltage as an alternating signal having a different phase to a piezoelectric element as an electro-mechanical energy conversion element constituting a vibration body. For example, a circular or elliptical motion is formed on the driving surface of the vibrating body by combining excited bending vibrations, and the vibrating body and the contact body that presses against the driving surface of the vibrating body relatively move by frictional force. I try to make it.

On the other hand, such drive control of the vibration wave device detects the rotation speed of the vibration wave motor and feeds it back to a control system to stabilize the rotation speed.

As an apparatus using such a vibration wave motor as a driving source, an image forming apparatus such as a color printer has been proposed. In this case, a photosensitive drum as an image carrier is arranged in parallel for each color, The transfer material is transported to the transfer position of each photosensitive drum, and the photosensitive drums of the respective colors are driven by the vibration wave motor, and a drive source that drives a transport belt for transporting the transfer material to each transfer position is also provided. The vibration wave motor is used.

The toner images of the respective colors are sequentially superimposed and transferred onto the transfer material, and the transfer material having passed the final transfer position is guided to a fixing device, where the toner images of the respective colors are heated and melted by heating and pressing. Then, the image is fixed on the transfer material and discharged outside the apparatus.

[0006]

In the above-described color image forming apparatus, since the fixing device and the transfer material conveying belt are close to each other due to a demand for downsizing the device, the transfer material conveying belt is hung. Since the diameter of the belt roller changes depending on the temperature, the position control is not sufficient only by controlling the rotation speed of the vibration wave motor itself. Actually, if the change in the diameter of the belt roller due to the temperature change is not taken into consideration, there may be a case where the transfer material conveying belt is displaced.

SUMMARY OF THE INVENTION [0007] An object of the first invention according to the present application is to provide a temperature detecting device capable of detecting an ambient temperature using a vibration wave device such as a vibration wave motor in view of such a conventional problem. Things.

An object of a second invention according to the present application is to provide a vibration wave device control device which can control a vibration wave device in response to a temperature change.

A third object of the present invention is to provide a vibration wave driving device capable of driving a driven body affected by a temperature change at a predetermined speed.

A fourth object of the present invention is to provide an image forming apparatus capable of providing a high-quality image by eliminating the influence of a temperature change.

[0011]

Means for Solving the Problems The constitution of the temperature detecting device for realizing the object of the first invention according to the present application is as follows: the driving frequency of the vibration wave device in the driving state, the set rotation speed of the vibration wave device, And temperature determining means for uniquely determining the temperature around the vibration wave device according to the relationship. According to a first configuration of the control device of the vibration wave device that realizes the object of the second invention according to the present application, a temperature detection unit that detects a temperature and a driving speed of the vibration wave device are set according to the temperature. Speed information setting means; and control means for selecting the drive speed set in the speed information setting means based on the temperature information from the temperature detection means to drive the vibration wave device.

A second configuration of the control device of the vibration wave device for realizing the object of the second invention according to the present application comprises a monitor means for monitoring a control voltage or a driving frequency of the vibration wave device, and Temperature detecting means for detecting a temperature based on monitor information; speed information setting means for setting a driving speed of the vibration wave device according to the temperature; and setting the speed information based on temperature information from the temperature detecting means. And a control means for selecting the drive speed set in the means and driving the vibration wave device.

A third configuration of the control device of the vibration wave device for realizing the object of the second invention according to the present application includes a temperature detecting means for detecting a temperature, and a drive speed of the vibration wave device set according to the temperature. Speed information setting means, a control means for selecting the drive speed set in the speed information setting means based on temperature information from the temperature detection means to drive the vibration wave device, and the vibration wave device Speed detecting means for detecting the driving speed of the vibration wave device, wherein the control means controls the driving of the vibration wave device by comparing the driving speed detected by the speed detecting means with the selected driving speed. .

A fourth configuration of the control device of the vibration wave device for realizing the object of the second invention according to the present application comprises a monitor means for monitoring a control voltage or a driving frequency of the vibration wave device, and Temperature detecting means for detecting a temperature based on monitor information; speed information setting means for setting a driving speed of the vibration wave device according to the temperature; and setting the speed information based on temperature information from the temperature detecting means. Control means for selecting the drive speed set in the means to drive the vibration wave device, and speed detection means for detecting the drive speed of the vibration wave device, wherein the control means The driving speed of the vibration wave device is controlled by comparing the detected driving speed with the selected driving speed.

In a fifth configuration of the control device of the vibration wave device for realizing the object of the second invention according to the present application, the driving speed set in the speed information setting means is a rotation speed.

According to a sixth configuration of the control device of the vibration wave device for realizing the object of the second invention according to the present application, the vibration wave device is a vibration wave motor.

A first configuration of a vibration wave driving device for realizing the object of the third invention according to the present application includes the vibration wave device control device according to any one of the above-described vibration wave devices, Thus, the driven body is driven.

A second configuration of the vibration wave driving device for realizing the object of the third invention according to the present application has a plurality of the driven members, and each of the driven members is driven by the vibration wave device. It is like that.

A first configuration of an image forming apparatus that achieves the object of the fourth invention according to the present application includes the vibration wave device control device according to any one of the above, and the vibration wave device includes It is used as a driving source.

A second configuration of an image forming apparatus that achieves the object of the fourth invention according to the present application has the vibration wave device as a drive source for a plurality of image carriers, and includes the vibration wave device. It is used as a drive source of a transport unit for transporting a transfer material to a transfer position with a plurality of image carriers.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 6
Shows a first embodiment of the present invention.

FIG. 3 shows a schematic configuration of a four-drum type color copying machine, in which 317 is a yellow image forming section, 318 is a magenta image forming section, 319 is a cyan image forming section, and 320 is
Denotes a black image forming unit. Since the respective components are the same, the yellow image forming unit 317 will be described in detail, and the description of the other image forming units will be omitted.

In the yellow image forming section 317, 34
Reference numeral 2 denotes a photosensitive drum, on which a latent image is formed by light from the LED array 210. Reference numeral 321 denotes a primary charger, which charges the surface of the photosensitive drum 342 to a predetermined potential.
Prepare for latent image formation. A developing device 322 develops the latent image on the photosensitive drum 342 to form a toner image. Note that the developing device 322 includes a sleeve 345 for applying a developing bias to perform development. A transfer charger 323 discharges from the back of the transfer material transport belt 333 to transfer the toner image on the photosensitive drum 342 to recording paper on the transfer material transport belt 333. In the present embodiment, since the transfer efficiency is good, the cleaner portion is not provided, but it is known that there is no problem even if the cleaner portion is attached.

Next, a procedure for forming an image on a recording paper or the like will be described. The recording paper and the like stored in the cassettes 340 and 341 are transferred one by one by paper feed rollers 336 and 337 by pickup rollers 338 and 339.
Supplied above. The fed recording paper is supplied to an adsorption charger 34.
Charged at 6.

Reference numeral 348 denotes a transfer material transport belt roller which drives the transfer material transport belt 333,
The recording paper and the like are charged in pairs with the transfer material transport belt 3.
The recording paper or the like is adsorbed to the reference numeral 33. A paper edge sensor 347 detects the edge of a recording paper or the like on the transfer material transport belt 333. The detection signal of the paper leading edge sensor is sent from the printer unit to the color reader unit, and is used as a sub-scan synchronization signal when a video signal is sent from the color reader unit to the printer unit.

Thereafter, the recording paper and the like are transferred to the transfer material transport belt 3.
The toner image is formed on the surface of the image forming units 317 to 320 in the order of YMCK. Recording paper or the like that has passed through the black image forming unit 320
To facilitate separation from the transfer material transport belt 333,
After the charge is removed by the charge removing charger 349, the transfer material transport belt 3
33. Reference numeral 350 denotes a peeling charger, which prevents image disturbance due to peeling discharge when recording paper or the like is separated from the transfer material transport belt 333. The separated recording paper or the like is charged by pre-fixing chargers 351 and 352 and then heat-fixed by a fixing unit 334 to prevent the image from being disturbed by supplementing the toner attraction force. Is discharged to the paper discharge tray.

In the above-described copying machine, when the vibration wave motor is used for driving the photosensitive drums 342 to 345 and the transfer material transport belt roller 348, a change in the diameter of the transfer material transport belt roller due to a temperature change must be taken into consideration. In addition, an image developed with each color toner on each photosensitive drum cannot be transferred onto the same transfer material in a consistent manner.

Therefore, in the present embodiment, the speed control of the vibration wave motor is performed in consideration of the change in the diameter of the transfer material conveying belt roller due to the temperature change.

Next, the speed control of the vibration wave motor will be briefly described.

A description of the structure of the vibration wave motor is omitted since it is proposed in Japanese Patent Application Laid-Open No. 63-73887, etc. However, various methods for controlling the speed have been proposed. In order to keep the vibration state in a resonance state, the frequency of an alternating wave as an alternating signal applied to a piezoelectric element as an electro-mechanical energy conversion element constituting the vibrating body is resonance-followed, and detected by speed detection means such as a pulse encoder. Method of controlling the amplitude of the voltage of the drive signal to be applied based on the speed information to be applied: There is a method of fixing one of the voltage amplitude and the frequency and controlling the other based on the speed information.

FIG. 11 shows a control block diagram of a general vibration wave motor. In FIG. 11, thick lines represent a plurality of bus lines. Reference numeral 901 denotes a CPU as a processing circuit, which determines a driving frequency and a pulse width of the vibration wave motor based on speed information. Reference numeral 902 denotes an oscillator such as a crystal oscillator which oscillates at a frequency of about 20 to 40 MHz,
A reference clock for generating a drive frequency and a pulse width is formed.

A frequency dividing circuit 903 frequency-divides the pulse of the oscillator 902 at a frequency dividing ratio based on information of the CPU 901. Reference numeral 904 denotes a pulse width generator which generates two phases: an output in which the pulse width specified by the CPU 901 is synchronized with a signal from the frequency dividing circuit 903 and a signal whose phase is shifted by 90 degrees.

FIG. 12 shows a time chart of two-phase signals. In FIG. 12, a period T is determined by a frequency dividing circuit 903, and a pulse width D is determined by a pulse width generator 904.

Returning to FIG. 11, reference numerals 905a and 905b denote boosters. The pulses A and B in FIG. 9 are input to each booster, and the vibration wave motor 906 rotates. A rotation number detector 907 detects the rotation state of the vibration wave motor as a pulse signal, measures the time of one cycle of a pulse having a frequency corresponding to the speed, and performs feedback control on the CPU 901 as speed data.

FIG. 1 is a block diagram showing the position control of the vibration wave motor when the transfer material conveying belt roller diameter changes due to a temperature change.

In FIG. 1, first, the temperature sensor 101
To detect the temperature. Based on this detection result, the selector 103 for selecting the number of revolutions accesses the table 102 in which the number of revolutions is set for each temperature, and selects an appropriate number of revolutions.

As shown in FIG. 4, the peripheral length of the transfer material conveying belt roller 348 changes depending on the temperature. For example, when the temperature increases, the transfer material conveying belt roller 348 expands and the circumference becomes longer, and when the temperature decreases, the transfer material conveyance belt roller 348 contracts and the circumference decreases.

As shown in FIG. 5, it is assumed that the rotation speed of the transfer material conveying belt roller is 100 rpm at a normal temperature of 25 ° C., for example. At this time, when the detection result of the temperature sensor 101 is 10 ° C., the diameter of the transfer material conveying belt roller tends to contract as shown in FIG. Thus, it will be delayed to 94 rpm.

For this reason, as shown in FIG. 6, the selector 103 selects the information of the number of revolutions 106 rpm at 10 ° C. from the table 102.

Conversely, if the detection result of the temperature sensor 101 is 40
When the temperature is ° C., the diameter of the transfer material conveying belt roller tends to expand as shown in FIG. 4, so that the rotational speed at room temperature advances to 106 rpm in position control with respect to the recording sheet at the normal rotation speed. For this reason, as shown in FIG. 6, the selector 103 selects the information of the rotation speed 94 rpm at 40 ° C. from the table 102.

Based on the result (frequency) selected as described above, the controller 104 performs drive frequency control to adjust the speed, outputs two-phase drive pulses to the boosters 105a and 105b, and outputs the vibration wave motor. 106 is driven.

Further, in the rotation speed detector 107 for detecting the rotation speed of the vibration wave motor 106,
The number of rotations is detected, and the detection result is sent to the comparator 108.
The comparator 108 detects the value detected by the rotation speed detector 107 and the selector 1.
03 and compare the frequency speed difference with the controller 10
4 to perform feedback control. At this time,
If the detected value of the rotation speed detector 107 does not reach the rotation speed selected by the selector 103, the controller 104 does not change the drive frequency control. If there is a difference in the rotation speed, the drive frequency control is restarted. The number of rotations is adjusted by adjusting.

Next, the control operation of the vibration wave motor according to the present embodiment will be described with reference to the flowchart of FIG.

First, in step 101 (hereinafter, S101), a temperature is detected by a temperature sensor.

Next, the process proceeds to S102, where the number of revolutions based on the temperature detection result is selected from a table in which the number of revolutions is set for each temperature, and a comparison is made in S103.

In S103, since the vibration wave motor is not rotating at the time of startup, the control first goes through the comparison control and proceeds to S104.

In S104, the drive frequency and the control value of the voltage are set so that the vibration wave motor has the rotation speed selected in S102.

Next, in S105, a driver is prepared to drive the vibration wave motor with the control value set in S104, and the vibration wave motor is driven in S106.

In S107, the rotation speed is detected by the rotation speed detector, and the rotation speed information is fed back to S103.

In the second and subsequent S103, the selected rotation speed in S102 is compared with the actual rotation speed in S107, and it is determined whether or not the comparison result matches the rotation speed selected in S102. If the comparison results are different, the same control is repeated in S104, and if the same, the operation is terminated.

By performing such control, the moving speed of the transfer material transport belt caused by the change in the diameter of the transfer material transport belt roller due to the temperature change can be set to a predetermined speed. Can be prevented from shifting.

(Second Embodiment) FIGS. 7 to 10 show a second embodiment of the present invention. FIG. 4 shows the position of the vibration wave motor when the speed of the vibration wave motor changes due to a temperature change. The control block diagram which performs control is shown.

As shown in FIG. 3, since the fixing device 334 exists near the transfer material conveying belt roller 348, the temperature change is remarkable as compared with the photosensitive drums 342 to 345. Therefore, in the present embodiment, the control voltage or the driving frequency of the vibration wave motor 106 for the transfer material conveying belt roller 348 is set to
The vibration wave motor 106 is monitored by the control signal monitor 109.
Detect the temperature of

A method of detecting the temperature of the control signal monitor 109 will be described with reference to FIGS. As shown in FIG. 9, the temperature characteristic of the vibration wave motor 106 has a characteristic that the speed decreases as the temperature of the vibration wave motor 106 increases, and increases as the temperature of the vibration wave motor 106 decreases.

Here, when the control frequency of the vibration wave motor is monitored, the rotation speed of the vibration wave motor is kept constant by the rotation speed detection circuit even if it is affected by a temperature change. As a result, the driving frequency changes.

Therefore, as shown in FIG. 10, the drive frequency can be detected, and the temperature can be detected from the set rotation speed. For example, it is assumed that the vibration wave motor is rotating at a driving frequency of B under a certain environmental temperature (detected by the environmental sensor shown in FIG. 3). If the setting of the number of revolutions of the motor is X, the current temperature is 37 ° C., and if the setting of the number of revolutions is 0.9X, the current temperature is 50 ° C. As described above, the temperature can be detected by monitoring the drive frequency and the rotation speed of the vibration wave motor.

The subsequent operation is the same as that of the above-described embodiment, and will not be described.

Next, the vibration wave motor control operation of the present invention will be described with reference to the flowchart of FIG.

First, first, in step 201 (hereinafter S2)
At 01), the control signal monitor 109 detects the temperature from the drive frequency and the number of rotations.

Next, the process proceeds to S202, where the number of revolutions based on the temperature detection result is selected from a table in which the number of revolutions is set for each temperature, and a comparison is made in S203.

Since the vibration wave motor is not rotating at the initial stage of the startup, the control is passed through the comparison control for the first time and the process proceeds to S204.

In S204, the frequency and voltage control values are set so that the vibration wave motor has the rotation speed selected in S202, and the drive frequency and control voltage value are output to S201, and the control signal is monitored in S201. Let it.

Next, in S205, a driver is prepared to drive the vibration wave motor with the control value set in S204, and the vibration wave motor is driven in S206.

In S207, the rotation speed is detected by the rotation speed detector, and the rotation speed information is fed back to S203.

In the second and subsequent S203, the selected rotation speed in S202 is compared with the actual rotation speed in S207, and it is determined whether or not the comparison result matches the rotation speed selected in S202. If the comparison result is different, the same control is repeated in S204, and if the same, the operation is terminated.

By performing such control, the moving speed of the transfer material conveying belt due to a change in the diameter of the transfer material conveying belt roller due to a temperature change can be set to a predetermined speed. Can be prevented from shifting.

[0067]

According to the temperature detecting device of the present invention, the temperature can be detected by using a vibration wave device such as a vibration wave motor as a driving source.

According to the control device of the vibration wave device of the present invention,
The drive speed such as the rotation speed of a vibration wave device such as a vibration wave motor can be corrected in accordance with the temperature change.

According to the vibration wave driving device of the present invention, even if the driven body is affected by the temperature change and its peripheral speed or the like is increased or decreased with respect to the driving speed such as a predetermined number of revolutions, the vibration wave motor or the like can be used. Since the driving speed such as the rotation speed of the vibration wave device is corrected to be a predetermined speed, the driven body can always be driven at a predetermined speed, and when a plurality of driven bodies are operated in a coordinated manner. ,
There is no speed difference between the driven bodies, and the driven bodies can be driven with high accuracy.

According to the image forming apparatus of the present invention, a high-quality image can be obtained when a plurality of image carriers are driven by using a vibration wave device such as a vibration wave motor as a drive source.

Further, even if the diameter of the roller around which the transfer material conveying means such as the transfer material conveyance belt is wound changes due to temperature change, the position of the transfer material conveyance belt can be controlled with high accuracy.

[Brief description of the drawings]

FIG. 1 is a control block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of FIG.

FIG. 3 is a schematic diagram of the image forming apparatus according to the first embodiment.

FIG. 4 is a diagram illustrating a relationship between a roller diameter and a temperature according to the first embodiment.

FIG. 5 is a diagram illustrating a relationship between the speed and the temperature of the transfer material conveying belt.

FIG. 6 is a diagram illustrating a relationship between a set speed and a temperature of the vibration wave motor.

FIG. 7 is a control block diagram showing a second embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of FIG. 7;

FIG. 9 is a diagram showing a relationship between speed and temperature of a vibration wave motor.

FIG. 10 is a diagram showing a relationship between a driving frequency and a temperature at each rotation speed of the vibration wave motor.

FIG. 11 is a control block diagram of a general configuration of a drive control device for a vibration wave motor.

FIG. 12 is a waveform chart showing the drive pulse signal of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Temperature sensor 102 ... Table information 103 ... Selector 104 ... Controller 105a, b ... Booster 106 ... Vibration wave motor 107 ... Rotation speed detector 108 ... Comparator 109 ... Control signal monitor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G03G 21/00 370 G03G 15/00 (72) Inventor Michio Kawase 3-2-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Jun Yamaguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Tetsuro Fukusaka 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (11)

[Claims] 1. A temperature determining means for uniquely determining a temperature around the vibration wave device based on a relationship between a driving frequency of the vibration wave device in a driving state and a set rotation speed of the vibration wave device. Temperature detector. 2. A temperature detecting means for detecting a temperature, a speed information setting means for setting a driving speed of the vibration wave device according to the temperature, and the speed information setting based on temperature information from the temperature detecting means. A control device for a vibration wave device, comprising: control means for selecting the driving speed set in the means and driving the vibration wave device. 3. A monitor for monitoring a control voltage or a driving frequency of the vibration wave device, a temperature detection device for detecting a temperature based on monitor information from the monitor, and a driving speed of the vibration wave device according to the temperature. Speed information setting means in which is set, and control means for driving the vibration wave device by selecting a drive speed set in the speed information setting means based on temperature information from the temperature detection means. Characteristic control device for vibration wave device. 4. A temperature detecting means for detecting a temperature, a speed information setting means for setting a driving speed of the vibration wave device according to the temperature, and the speed information setting based on temperature information from the temperature detecting means. Control means for selecting the drive speed set in the means to drive the vibration wave device, and speed detection means for detecting the drive speed of the vibration wave device, wherein the control means A control device for a vibration wave device, wherein a drive speed of the vibration wave device is controlled by comparing a detected drive speed with the selected drive speed. 5. A monitoring means for monitoring a control voltage or a driving frequency of the vibration wave device, a temperature detection means for detecting a temperature based on monitor information from the monitoring means, and a driving speed of the vibration wave device according to the temperature. Speed information setting means in which is set, control means for selecting the drive speed set in the speed information setting means based on temperature information from the temperature detection means to drive the vibration wave device, and Speed detecting means for detecting a driving speed of the wave device, wherein the control means compares the driving speed detected by the speed detecting means with the selected driving speed to drive-control the vibration wave device. A control device for a vibration wave device, comprising: 6. The driving speed set in the speed information setting means is a rotation speed.
Or the control device of the vibration wave device according to 5. 7. The control device according to claim 2, wherein the vibration wave device is a vibration wave motor. 8. A vibration wave driving device, comprising the control device for a vibration wave device according to claim 1, wherein the driven member is driven by the vibration wave device. 9. The vibration wave driving device according to claim 8, comprising a plurality of the driven members, wherein each of the driven members is driven by the vibration wave device. 10. An image forming apparatus, comprising: the vibration wave device control device according to claim 1; wherein the vibration wave device is used as a drive source. 11. The vibration wave device as a drive source for a plurality of image carriers, and the vibration wave device as a drive source for a transport unit that transports a transfer material to a transfer position with the plurality of image carriers. An image forming apparatus characterized by using: