JPH1010950A - Image forming device and method, and storage medium loading program code readable by computer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To superpose the images without misregistration, by selecting one of plural transfer member driving clock signals generated by a generator corresponding to the misregistration quantity between a prescribed position and an exposure position, and controlling the driving of the transfer member by a drive controlling means on the basis of the selected driving clock signal. SOLUTION: The first detecting means (sensor 10), detects a position of a transfer supporting member 17, and outputs the first position signal. The second detecting means (BD sensor) detects a position of a rotary polygon mirror, and outputs the second position signal. A clock selecting circuit 24 selects a pulse signal so that the phase difference generated from a constant phase difference waveform generating circuit 22 becomes minimum, at the timing when a TOP signal is detected immediately after a BD signal is detected, and outputs the same to a pulse motor driver 26. Thereby the transfer supporting member 17 can be driven by selecting the pulse signal of the minimum phase difference as a main scanning direction synchronous signal, from plural constant phase difference signals in the non-printing area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for obtaining a color image by superimposing a plurality of plane images, an image forming method, and a storage medium storing a program code readable by a computer.

[0002]

2. Description of the Related Art Color misregistration control in a multicolor printing operation of an electrophotograph or the like is mainly performed by synchronous control of a driving motor and setting of a mechanism, which is subject to many restrictions of a mechanism system and leads to an increase in a control circuit scale.

[0003] For example, the peripheral lengths of the photosensitive member and the transfer member, and the relationship between the peripheral length of the transfer member and the number of synchronization signals in the main scanning direction are set to integer ratios. , Complete synchronization control is performed by performing PLL control independent of signals obtained by dividing the frequency from the same reference clock.

[0004]

However, in the above-mentioned conventional example, since the number of transfer members and the number of synchronization signals in the main scanning direction are set to an integer ratio, design changes such as changing the frequency of synchronization signals in the main scanning direction are required. There has been a problem that the circumference of the transfer body must be modified each time. Furthermore, since each drive system is controlled independently by PLL, the circuit scale is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to superimpose a plurality of surface images on an image carrier without color shift. An object of the present invention is to provide an image forming apparatus, an image forming method, and a storage medium storing a computer readable program code.

[0006]

According to a first aspect of the present invention, there is provided an exposure means for exposing a photosensitive member in a main scanning direction, and a transfer member for transferring a toner image formed on the photosensitive member. An image forming apparatus that adjusts a transfer position of the toner image, a detection unit that detects a predetermined position of the transfer body, a detection unit that detects an exposure position by the exposure unit, Generating means for simultaneously generating a plurality of transfer body drive clock signals for controlling the driving of the transfer body; and a plurality of transfer body drive clocks generated by the generation means in accordance with a shift amount between the predetermined position and the exposure position. Drive control means for selecting one of the signals and controlling the drive of the transfer body based on the selected drive clock signal.

According to a second aspect of the present invention, there is provided an exposure unit for exposing a photoconductor in a main scanning direction, a transfer unit driving unit for driving a transfer unit for transferring a toner image formed on the photoconductor. And a detecting step of detecting a predetermined position of the transfer body, a detecting step of detecting an exposure position by the exposure unit, and driving the transfer body. A generating step of simultaneously generating a plurality of transfer body drive clock signals for performing control, and selecting one of the plurality of transfer body drive clock signals to be generated according to a shift amount between the predetermined position and the exposure position. And a driving step of driving the transfer body based on the selected driving clock signal.

According to a third aspect of the present invention, there is provided an exposure unit for exposing a photoconductor in a main scanning direction, a transfer unit driving unit for driving a transfer unit for transferring a toner image formed on the photoconductor. A storage medium storing a computer readable program code for adjusting a transfer position of the toner image, a program code for a detection step of detecting a predetermined position of the transfer body, and an exposure position by the exposure means. And a program code for a generation step of simultaneously generating a plurality of transfer body drive clock signals for controlling the transfer body, and a shift amount between the predetermined position and the exposure position. A program code of a selecting step for selecting any one of a plurality of transfer body driving clock signals to be generated; Zui computer comprising a program code of a driving step of driving the transfer member is one that stores the read program code in the storage medium.

According to a fourth aspect of the present invention, a main scanning is performed by deflecting an exposure beam on a photosensitive drum by a rotating polygon mirror to form a latent image on the photosensitive drum. A first reference clock signal having a predetermined period is generated in an image forming apparatus which develops with a toner and transfers the developed toner image to the same transfer material on a rotating transfer support a plurality of times to obtain a multicolor image. A first clock source, pulse generating means for generating a plurality of pulse signals having a predetermined phase difference from the first reference clock signal, and the transfer support in synchronism with any one of the pulse generating means; First driving means for rotationally driving the body, first detecting means for detecting a position of the transfer support and outputting a first position signal,
A second clock source for generating a second reference clock signal having a predetermined period, second driving means for driving the rotary polygon mirror based on the second reference clock signal, and detecting a position of the rotary polygon mirror A second detecting means for outputting a second position signal, and a phase difference generated from the pulse generating means at a timing when the first position signal is detected immediately after detecting the second position signal is minimized. Selecting means for selecting any one of the following pulse signals and outputting the selected signal to the first driving means.

In a fifth aspect according to the present invention, the selection means selects any one of the pulse signals having a minimum phase difference generated from the pulse generation means for each non-printing area, and selects the first pulse signal. This is output to the driving means.

According to a sixth aspect of the present invention, the pulse generation means has a fixed phase difference with the first reference clock signal, and the phase difference makes a round of the phase difference of the first reference clock signal. A plurality of pulse signals having the same phase as the phase are simultaneously generated.

According to a seventh aspect of the present invention, a main scanning is performed by deflecting an exposure beam on a photosensitive drum by a rotating polygon mirror to form a latent image on the photosensitive drum. A first reference clock signal having a predetermined period is generated in an image forming apparatus which develops with a toner and transfers the developed toner image to the same transfer material on a rotating transfer support a plurality of times to obtain a multicolor image. A first clock source, pulse generating means for generating a plurality of pulse signals having a predetermined phase difference from the first reference clock signal, and the transfer support in synchronism with any one of the pulse generating means; First driving means for rotationally driving the body, first detecting means for detecting a position of the transfer support and outputting a first position signal,
A second clock source for generating a second reference clock signal having a predetermined period, second driving means for driving the rotary polygon mirror based on the second reference clock signal, and detecting a position of the rotary polygon mirror A second detecting means for outputting a second position signal, and a phase difference generated from the pulse generating means at a timing when the first position signal is detected immediately after detecting the second position signal is minimized. Address control means for sequentially updating and setting a change address for switching and selecting any one of the pulse signals; and a phase difference generated from the pulse generation means after the change address set by the address control means is determined. Selecting means for selecting one of the minimum pulse signals and outputting the selected signal to the first driving means.

In an eighth aspect according to the present invention, the selection means outputs a phase adjustment pulse having a cycle longer than the cycle of the first reference clock signal until a change address set by the address control means is determined. This is output to the first driving means.

In a ninth aspect according to the present invention, the selection means selects any one of the pulse signals having a minimum phase difference generated by the pulse generation means for each non-printing area, and selects the first pulse signal. This is output to the driving means.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a schematic sectional view showing an example of an image forming apparatus according to a first embodiment of the present invention.
It corresponds to a color laser beam printer (color image forming apparatus) using an electrophotographic process. In addition, since the color laser beam printer itself belongs to the public domain, its explanation will be simply given. Further, in the embodiment of the present invention, the surface image means each transfer image when an image formed on the photosensitive member is superimposed a plurality of times for each rotation of the transfer member.

In FIG. 1, reference numeral 1 denotes a printer main body, and 2 denotes an interface unit, which is a unit for inputting digital image data read by a scanner (not shown) or the like. The printer body 1 prints out an image corresponding to the data input from the interface unit 2 in full color. RGB sent from the interface unit 2 to the signal processing unit 3
The signals are converted into magenta (M), cyan (C), yellow (Y), and black (BK) color image signals by the signal processing unit 3 and sent to the laser driver 4. The laser driver 4 modulates the semiconductor laser 5 with respect to each color image signal (each surface image signal) and outputs a modulated laser light L corresponding to the image signal. The laser light L is a polygon mirror 6,
Scanning is performed on a photosensitive drum 9 as an image carrier via an f-θ lens 7 and a mirror 8.

The photosensitive drum 9 is driven to rotate at a predetermined peripheral speed (process speed) in a counterclockwise direction indicated by an arrow, and an electrostatic latent image is formed by scanning the laser beam on the charged surface of the photosensitive drum. It is formed.

Reference numeral 11 denotes an engine control unit, and 12 denotes a rotary developing unit, which comprises a magenta developing unit 13, a cyan developing unit 14, a yellow developing unit 15, and a black developing unit 16.
The two developing units alternately contact the photosensitive drum, and develop the electrostatic latent image formed on the photosensitive drum 9 with toner. Reference numeral 17 denotes a transfer drum, which is a sheet P fed from a sheet cassette 18.
Is wound around the transfer drum 17, and the image developed on the photosensitive drum 9 is transferred to the paper P.

The process of forming, developing, and transferring the latent image is repeated for each of the magenta, cyan, yellow, and black color image signals so that the four color toners of a magenta toner image, a cyan toner image, a yellow toner image, and a black toner image are obtained. The images are sequentially superimposed and transferred onto the same sheet P, whereby a full-color image is synthesized and formed.

FIG. 2 is a block diagram for explaining details of a reference signal detecting circuit generated with the rotation of the transfer drum 17 shown in FIG. 1. FIG. 3 is a block diagram of the reference signal detecting circuit shown in FIG. 6 is a timing chart illustrating an operation.

In FIGS. 2 and 3, reference numeral 20 denotes a reference clock source constituted by, for example, a crystal oscillator or the like, which generates a reference clock signal (reference CLK1 signal) 21. 22 is a constant phase difference waveform generation circuit, which divides the frequency of the reference CLK1 signal 21;
N constant phase difference delay signals 23 (constant phase difference delay signals φ1 to φn) each having a constant delay time τd with a period τs
Generate. That is, the delay time τd is n and the period τ
s. (Τs = n · τd) 29 is an 1st BD signal detection circuit, which is a sub-scanning direction synchronizing signal 27 by the sensor 10 arranged on the transfer drum 17.
(Hereinafter, abbreviated as / TOP signal), the main scanning direction synchronization signal 2 output from the scanner unit 34 immediately after the detection is detected.
8 (hereinafter abbreviated as BD signal) is extracted as the 1st BD signal 30. A clock selection circuit 24 selects a signal having the least phase difference with respect to the 1st BD signal 30 from the n constant phase difference delay signals 23 and outputs the selected signal as a motor control pulse 25 to a pulse motor driver 26. Note that a pulse motor for driving the transfer drum 17 is omitted.

Reference numeral 31 denotes a reference clock source constituted by, for example, a crystal oscillator or the like, and generates a reference clock signal (reference CLK2 signal) 32. 33 is a motor driver / PLL
Then, an excitation pulse is output to a scanner motor that rotationally drives a polygon mirror in the scanner unit 34. In addition,
The scanner unit 34 is provided with a BD sensor at a predetermined position, detects a laser beam L to be scanned, and outputs a BD signal serving as a synchronization signal in the main scanning direction to the motor driver / PLL 33.
Is output to the 1st BD signal detection circuit 29.

Hereinafter, this embodiment will be described with reference to FIG.

In this embodiment, a main scanning is performed by deflecting an exposure beam on a photosensitive drum 9 by a rotating polygon mirror (polygon mirror 6) to form a latent image on the photosensitive drum 9, and the formed latent image is formed. With a plurality of toners (rotary developing device 12)
Then, in an image forming apparatus that transfers a developed toner image to the same transfer material on a rotating transfer support (transfer drum 17) a plurality of times to obtain a multicolor image,
A first clock source (reference clock source 20) for generating a reference clock signal, and pulse generating means (constant phase difference waveform generation circuit) for generating a plurality of pulse signals having a predetermined phase difference from the first reference clock signal 22), first driving means (pulse motor driver 26) for rotating and driving the transfer support in synchronization with one of the pulse signals from the pulse generating means, and 1, a first detecting means (sensor 10) for outputting a position signal, a second clock source (reference clock source 31) for generating a second reference clock signal of a predetermined period, and a second reference clock signal. Second driving means (motor driver / PLL 33) for driving the rotary polygon mirror, and second detecting means (BD (not shown) for detecting the position of the rotary polygon mirror and outputting a second position signal) And any one of the pulse signals that minimizes the phase difference generated by the pulse generation means at the timing when the first position signal is detected immediately after the second position signal is detected, and A selection means (clock selection circuit 24) for outputting to the first drive means is provided, and the clock selection circuit 24 is generated from the constant phase difference waveform generation circuit 22 at the timing of detecting the / TOP signal immediately after detecting the BD signal. Is selected and output to the pulse motor driver 26, so that a pulse having the smallest phase difference from the plurality of constant phase difference signals to the main scanning direction synchronization signal in the non-printing area is selected. The signal can be selected to drive the transfer support, and the circuit configuration of the transfer rotation system and the optical scanning system is facilitated without any mechanical restrictions.

Hereinafter, the operation of each unit will be described in detail with reference to FIG.

For example, an n-bit constant phase difference delay signal 2
The period of 3 is set to twice the period of the BD signal 28. /
In a state before the TOP signal 27 is detected, the constant phase difference delay signal φ3 in the constant phase difference delay signal 23 is selected as the motor control pulse 25. When the / TOP signal 27 is detected, the clock selection circuit 24 selects a constant phase difference delay signal φm having the smallest phase from the constant phase difference delay signal 23 with respect to the first BD signal 30 based on the first BD signal 30. , As a motor control pulse 25 to the pulse motor driver 26.

Thus, the correction control is performed such that the motor control pulse 25 is synchronized with the BD signal 28 in the non-image area, and even if the clock sources of the BD signal system and the / TOP signal system are independent, it is possible. As far as possible, the synchronization shift between the BD signal and the / TOP signal can be reduced, the transfer position shift of each color image can be reduced, and a color image without color shift can be formed at low cost.

[Second Embodiment] In the above embodiment, the next BD signal is detected from the / TOP signal, and a constant phase difference delay signal having a small phase difference is immediately switched and selected for synchronization. The case where the control is executed has been described. However, the control may be performed such that the constant phase difference delay signal is switched to the target constant phase difference delay signal while preventing the stepping out of the pulse motor that drives the transfer drum 17. . Hereinafter, the embodiment will be described.

FIG. 4 is a block diagram for explaining a main configuration of an image forming apparatus according to a second embodiment of the present invention.
The same components as those in FIG. 2 are denoted by the same reference numerals, and FIG.
5 is a timing chart for explaining the operation of each unit shown in FIG. Hereinafter, the configuration and operation will be described.

4 and 5, an address control circuit 40 monitors the signal address of the selected constant phase difference delay signal 23 before the / TOP signal 27 is detected. Further, when the first BD signal 30 is input, the constant phase difference delay signal 23
The signal having the least phase difference is detected and set as a set address. From this result, one count is incremented from the signal address to the set address.

Reference numeral 41 denotes a 1-bit address control signal, which is a sequential control pulse 4 outputted from the control pulse selecting circuit 42.
3 is an address control line. Control pulse selection circuit 42
The address control signal 41 indicates that n constant phase difference delay signals 23 are inputted and which of them is to be selected and outputted.
Is determined by

As shown in FIG. 5, for example, the period of the constant phase difference delay signal 23 is set to twice the period of the BD signal 28.

The constant phase difference delay signal 23 has a signal address "k" before the / TOP signal 27 is detected. The set address “n” is detected in the address control circuit 40 in which the 1stBD signal 30 is detected.

Thus, the constant phase difference delay signal φ (k + 1) and the constant phase difference delay signal 23 are switched from the constant phase difference delay signal φk at the correction start point by successive addition or successive subtraction, and the constant phase difference delay signal φn signal To reach.
The sequential control pulse 43 output in this way has a period (τs + τd) until the correction is completed. Therefore, the phase adjustment section from the correction start point to the correction end point m is (nk) · (τ).
s + τd).

As described above, even if the constant phase difference delay signal to be selected has a large phase difference with the previously selected constant phase difference delay signal, the pulse motor driver 26 sequentially adds the phase difference signal until the selected difference delay signal is selected. Then, since the constant phase difference delay signal gradually changes by subtraction or successive subtraction, the synchronous control can be completed without stepping out of the pulse motor and within the section where the / TOP signal 27 is "LOW".

Hereinafter, the present embodiment will be described with reference to FIG.

In this embodiment, a main scanning is performed by deflecting the exposure beam on the photosensitive drum 9 by a rotating polygon mirror (polygon mirror 6) to form a latent image on the photosensitive drum 9, and the formed latent image is formed. With a plurality of toners (rotary developing device 12)
Then, in an image forming apparatus that transfers a developed toner image to the same transfer material on a rotating transfer support (transfer drum 17) a plurality of times to obtain a multicolor image,
A first clock source (reference clock source 20) for generating a reference clock signal, and pulse generating means (constant phase difference waveform generation circuit) for generating a plurality of pulse signals having a predetermined phase difference from the first reference clock signal 22), first driving means (pulse motor driver 26) for rotating and driving the transfer support in synchronization with one of the pulse signals from the pulse generating means, and 1, a first detecting means (sensor 10) for outputting a position signal, a second clock source (reference clock source 31) for generating a second reference clock signal of a predetermined period, and a second reference clock signal. Second driving means (motor driver / PLL 33) for driving the rotary polygon mirror, and second detecting means (BD (not shown) for detecting the position of the rotary polygon mirror and outputting a second position signal) To select one of the pulse signals that minimizes the phase difference generated by the pulse generation means at the timing when the first position signal is detected immediately after the second position signal is detected. An address control means (address control circuit 40) for sequentially updating and setting the changed address of one of the following: a phase difference generated by the pulse generating means after the changed address set by the address control means is determined; And a selection means (control pulse selection circuit 42) for selecting the pulse signal and outputting the selected signal to the first drive means, and the address control circuit 40 detects the / TOP signal immediately after the BD signal is detected. A change address for switching and selecting any one of the pulse signals that minimizes the phase difference generated from the constant phase difference waveform generation circuit 22 is sequentially set. After the update is set and the change address to be set is determined, the control pulse selecting circuit 42 selects one of the pulse signals having the minimum phase difference generated from the constant phase difference waveform generating circuit 22 to select the pulse signal. 26, the pulse signal having the smallest phase difference as the main scanning direction synchronization signal can be selected from the plurality of constant phase difference signals in the non-printing area, and the transfer support can be driven without step-out, and mechanical restrictions The circuit configuration of the transfer rotation system and the optical scanning system is facilitated without receiving the above.

FIG. 6 is a flowchart illustrating an example of a transfer drum drive control procedure in the image forming apparatus of the present invention. (1) to (8) indicate each step. Each step is performed by a CP (not shown) of the engine control unit 11.
This is executed by a controller unit having U, RAM, and ROM executing a control program stored in the ROM. Note that, for example, the cycle of the constant phase difference delay signal 23 is
It is assumed that the period is set to twice the period of the BD signal 28.

The address control circuit 40 monitors the set address "n" of the constant phase difference delay signal 23 (1),
When the OP signal is detected by the sensor 10 (2), the next BD signal is detected by the 1stBd signal detection circuit 29 (3), and the constant phase difference delay signal φ is selected (4), and the set address is controlled by the address. Set in the circuit 40. Then
The correction process is started (5), the address control signal 41 increments the address count (6), and outputs the address control signal 41 to the control pulse control circuit 42.

Then, the process waits for the completion of the correction process (the completion of the count-up of the set address) (7), and when the correction process is completed, the address of the control pulse 43 is sequentially determined (8), and the process returns.

[Other Embodiments of the Present Invention] The present invention is applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), and is applied to one device (for example, a copying machine, Facsimile machine).

Also, a computer connected to the various devices or a computer in a system for operating various devices so as to realize the functions of the above-described embodiment is provided. The present invention also includes a software program code supplied and implemented by operating the various devices according to a program storing a computer (CPU or MPU) of the system or apparatus.

In this case, the program code of the software implements the functions of the above-described embodiment, and the program code itself and means for supplying the program code to a computer, such as the program The storage medium storing the code constitutes the present invention.

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

When the computer executes the supplied program code, not only the functions of the above-described embodiment are realized, but also the OS (operating system) in which the program code runs on the computer, or Needless to say, the program code is also included in the embodiment of the present invention when the functions of the above-described embodiment are realized in cooperation with other application software or the like.

Further, the supplied program code is stored in a memory provided on a function expansion board of a computer or a function expansion unit connected to the computer, and then stored in the function expansion board or the function expansion unit based on the instruction of the program code. It is needless to say that the present invention includes a case where a provided CPU or the like performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

The present invention may be applied to a system constituted by a plurality of devices or to an apparatus constituted by a single device. Needless to say, the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or an apparatus. In this case, by reading a storage medium storing a program represented by software for achieving the present invention into the system or the apparatus, the system or the apparatus can enjoy the effects of the present invention. .

Further, by downloading and reading out a program represented by software for achieving the present invention from a database on a network by a communication program, the system or apparatus can be
It is possible to enjoy the effects of the present invention.

[0049]

As described above, according to the present invention,
One of a plurality of transfer body drive clock signals generated by the generating means is selected according to the amount of deviation between the predetermined position and the exposure position, and the drive control means controls the transfer body based on the selected drive clock signal. Is controlled, the transfer body can be rotated at a timing when the predetermined position and the exposure position coincide with each other, and each surface image can be superimposed without any positional displacement.

Further, according to the present invention, the phase difference generated from the pulse generating means by the selecting means at the timing of detecting the first position signal immediately after detecting the second position signal is minimized. Since any one of the pulse signals is selected and output to the first driving means, the pulse signal having the smallest phase difference as the main scanning direction synchronization signal is selected and transferred from the plurality of constant phase difference signals in the non-printing area. The support can be driven, and the circuit configuration of the transfer rotation system and the optical scanning system becomes easy without any mechanical restrictions.

Further, according to the present invention, the address control means determines that the phase difference generated from the pulse generation means is minimized at the timing when the first position signal is detected immediately after the detection of the second position signal. The change address for switching and selecting one of the following pulse signals is sequentially updated and set,
After the change address to be set is determined, the selecting means selects any one of the pulse signals having the minimum phase difference generated from the pulse generating means and outputs it to the first driving means. In the area, a pulse signal having the smallest phase difference as the main scanning direction synchronization signal is selected from a plurality of constant phase difference signals, and the transfer support can be driven without step-out, and the transfer rotation system can be operated without mechanical restrictions. The circuit configuration with the optical scanning system becomes easy.

Therefore, even if the design load on the transfer rotation system and the optical scanning system is eliminated, and a clock source is provided in each control circuit, a color image with little color shift can be formed. To play.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating an example of an image forming apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating details of a reference signal detection circuit generated with the rotation of the transfer drum shown in FIG.

FIG. 3 is a timing chart illustrating an operation of the reference signal detection circuit illustrated in FIG. 2;

FIG. 4 is a block diagram illustrating a main configuration of an image forming apparatus according to a second exemplary embodiment of the present invention.

FIG. 5 is a timing chart for explaining the operation of each section shown in FIG. 4;

FIG. 6 is a flowchart illustrating an example of a transfer drum drive control procedure in the image forming apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 10 sensor 17 transfer drum 21 reference CLK1 22 constant phase difference waveform generation circuit 24 clock selection circuit 26 pulse motor driver 29 1stBd signal detection circuit 31 reference CLK2 33 motor driver / PLL 34 scanner unit

Claims (9)

[Claims] An exposure unit that exposes the photoconductor in a main scanning direction; and a transfer unit driving unit that drives a transfer unit that transfers a toner image formed on the photoconductor. In an image forming apparatus for adjusting a transfer position, a detection unit for detecting a predetermined position of the transfer body, a detection unit for detecting an exposure position by the exposure unit, and a transfer body drive for performing control for driving the transfer body Generating means for simultaneously generating a plurality of clock signals; and selecting one of a plurality of transfer body driving clock signals generated by the generating means in accordance with a shift amount between the predetermined position and the exposure position; A drive control unit for controlling the drive of the transfer body based on a signal. 2. An image forming apparatus comprising: an exposure unit configured to expose a photoconductor in a main scanning direction; and a transfer unit driving unit configured to drive a transfer unit configured to transfer a toner image formed on the photoconductor. In the image forming method for adjusting a transfer position, a detection step of detecting a predetermined position of the transfer body, a detection step of detecting an exposure position by the exposure unit, and a drive of the transfer body for performing control for driving the transfer body A generating step of simultaneously generating a plurality of clock signals; a selecting step of selecting any one of a plurality of transfer body driving clock signals to be generated according to a shift amount between the predetermined position and the exposure position; A driving step of driving the transfer member based on a driving clock signal. 3. An exposure device for exposing a photoconductor in a main scanning direction, and a transfer member driving device for driving a transfer member for transferring a toner image formed on the photoconductor, wherein the transfer device includes In a storage medium storing a computer readable program code for adjusting a transfer position, a program code of a detection step of detecting a predetermined position of the transfer body, and a program code of a detection step of detecting an exposure position by the exposure unit A program code of a generation step of simultaneously generating a plurality of transfer body drive clock signals for controlling the transfer body; and a plurality of transfer bodies generated according to a shift amount between the predetermined position and the exposure position. Driving the transfer body based on a program code of a selection step of selecting any one of the drive clock signals, and the selected drive clock signal; Storage medium having a computer including a program code of a driving step of is characterized by storing the read program code. 4. A main scanning is performed by deflecting an exposure beam on a photosensitive drum by a rotary polygon mirror to form a latent image on the photosensitive drum, and the formed latent image is developed with a plurality of toners. An image forming apparatus that transfers a toner image to the same transfer material on a rotating transfer support a plurality of times to obtain a multi-color image, a first clock source for generating a first reference clock signal having a predetermined cycle; Pulse generating means for generating a plurality of pulse signals having a certain phase difference from the first reference clock signal; and a first driving means for rotating the transfer support in synchronization with any of the pulse signals from the pulse generating means. Driving means, first detecting means for detecting the position of the transfer support and outputting a first position signal, second clock source for generating a second reference clock signal having a predetermined period, and the second reference Based on the clock signal Second driving means for driving the rotating polygon mirror, second detecting means for detecting the position of the rotating polygon mirror and outputting a second position signal, and immediately after detecting the second position signal. Selecting means for selecting any one of the pulse signals having a minimum phase difference generated from the pulse generating means at the timing of detecting the first position signal and outputting the selected signal to the first driving means. An image forming apparatus comprising: 5. The method according to claim 1, wherein the selecting unit selects any one of the pulse signals having a minimum phase difference generated by the pulse generating unit for each non-printing area and outputs the selected pulse signal to the first driving unit. The image forming apparatus according to claim 4, wherein 6. The pulse generating means generates a pulse signal having a certain phase difference with the first reference clock signal, and having a phase difference in phase with the phase of the first reference clock signal. 5. The image forming apparatus according to claim 4, wherein a plurality of images are generated at the same time. 7. A main scanning is performed by deflecting an exposure beam on a photosensitive drum by a rotary polygon mirror to form a latent image on the photosensitive drum, and the formed latent image is developed with a plurality of toners. An image forming apparatus for transferring a toner image to a same transfer material on a rotating transfer support a plurality of times to obtain a multicolored color image, wherein a first clock source for generating a first reference clock signal of a predetermined cycle; Pulse generating means for generating a plurality of pulse signals having a predetermined phase difference from the first reference clock signal; and a first driving means for rotating and driving the transfer support in synchronization with any of the pulse signals from the pulse generating means. Driving means, first detecting means for detecting the position of the transfer support and outputting a first position signal, second clock source for generating a second reference clock signal having a predetermined period, and the second reference Based on the clock signal Second driving means for driving the rotating polygon mirror, second detecting means for detecting the position of the rotating polygon mirror and outputting a second position signal, and immediately after detecting the second position signal. Address control means for sequentially updating and setting a change address for switching and selecting any one of the pulse signals having a minimum phase difference generated from the pulse generation means at the timing of detecting the first position signal; After the change address set by the control means is determined, any one of the pulse signals that minimizes the phase difference generated by the pulse generation means is selected and the first signal is selected.
An image forming apparatus comprising: a selection unit that outputs to the driving unit. 8. The selecting means outputs to the first driving means a phase adjustment pulse having a cycle longer than the cycle of the first reference clock signal until a change address set by the address control means is determined. The image forming apparatus according to claim 7, wherein: 9. The method according to claim 1, wherein the selecting unit selects one of the pulse signals having a minimum phase difference generated by the pulse generating unit for each non-printing area and outputs the selected signal to the first driving unit. The image forming apparatus according to claim 8, wherein