JP2009103879A - Image forming device, and image formation control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device and an image formation control program, capable of reducing a disturbance of an image caused by an attaching angle error of a recorder. <P>SOLUTION: An attaching angle α of a magnetic recording head 14 for forming a magnetic latent image is detected in a recording face 14A unit arrayed with a plurality of recording elements 13 capable of writing magnetic information into an outer circumferential face of a rotation-driven magnetic drum 12 along a main scanning direction and a sub-scanning direction, image information is rotated by -α in response to the detected angle, before recorded, a forming position of the magnetic latent image is controlled to form closely the magnetic latent image, in response to a shape of the recording face 14A changed by determining the recording elements 13 to control a writing operation in response to the attaching angle α, and the magnetic latent image is formed by controlling the writing operation by each recording element 13, based on the rotated image information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus and an image formation control program.

  As an image forming apparatus, it has been proposed to shorten the time required for recording by using a recording head provided with a plurality of recording elements for forming an image or a latent image on a recording medium.

  This type of recording head may be configured by arranging a plurality of recording elements in a plurality of rows. In this case, it is known that a positional deviation of each recording element in the main scanning direction and the sub-scanning direction occurs at the manufacturing stage of the recording head.

Conventionally, Patent Document 1 uses a recording head in which a plurality of LEDs are arranged at a higher density than the output pixel density, and detects a positional deviation of the LEDs by measuring a preset reference line and the position of the LEDs. Then, it has been proposed to correct the displacement by selecting and controlling the LED to be driven so as to coincide with the reference line.
JP-A-5-084972

  An object of the present invention is to provide an image forming apparatus and an image forming control program that can reduce image disturbance due to an attachment angle error of a recording apparatus.

  According to the first aspect of the present invention, a magnetic recording for forming a magnetic latent image in units of recording surfaces in which a plurality of magnetic recording elements capable of writing magnetic information on the peripheral surface of a rotationally driven magnetic drum are arranged in the main scanning direction and the sub-scanning direction. Apparatus, position control means for controlling the formation position of the magnetic latent image by the magnetic recording apparatus, write control means for controlling the writing operation by each magnetic recording element based on image information, and the mounting angle of the magnetic recording apparatus Detecting means for detecting image data, rotation processing means for rotating image information to be recorded by the magnetic recording device according to the angle detected by the detecting means, and writing according to the angle detected by the detecting means. By determining the magnetic recording element for controlling the operation, the shape of the recording surface is substantially changed, and the magnetic latent image is formed without a gap in accordance with the change. And controlling the position control means and the write control means so as to control the writing operation by each magnetic recording element based on the image information rotated by the rotation processing means. And a control means.

  According to a second aspect of the present invention, there is provided a reference line formed as a magnetic latent image that is not rewritable in advance on the peripheral surface of the magnetic drum, and detection means capable of detecting the magnetic latent image formed on the peripheral surface of the magnetic drum. The control means, when the attachment angle is detected by the detection means, is linearly applied to the magnetic drum by any one row of magnetic recording elements arranged on the recording surface of the magnetic recording apparatus. The write control means is controlled to form an angle detection magnetic latent image indicating the angle detection magnetic latent image and the reference line based on the detection result of the magnetic latent image by the detection means. By specifying the positional relationship, the mounting angle of the magnetic recording device with respect to the magnetic drum is detected.

  According to a third aspect of the present invention, the control means records the formation position information of the magnetic latent image in the direction of the rotation axis of the magnetic drum in advance on the peripheral surface of the magnetic drum by the magnetic recording device. The position control means is controlled to position the magnetic recording device using formation position information formed on the peripheral surface of the drum.

  According to a fourth aspect of the present invention, the formation position information formed in advance on the peripheral surface of the magnetic drum is a continuous linear shape along the movement locus of the magnetic recording apparatus.

  According to a fifth aspect of the present invention, a magnetic latent image is formed on a computer in units of recording surfaces in which a plurality of magnetic recording elements capable of writing magnetic information are arranged in a main scanning direction and a sub-scanning direction on a peripheral surface of a magnetic drum driven to rotate. A detection step for detecting an attachment angle of the magnetic recording device, a setting step for setting a rotation angle for rotating image information to be recorded by the magnetic recording device according to the angle detected by the detection step, A determination step for determining a magnetic recording element that controls a writing operation according to the angle detected by the detection step, and the magnetic latent image is formed without a gap according to the shape of the recording surface changed by the determination step. Derivation step for deriving the formation position of the magnetic latent image and image information rotated at the rotation angle set by the setting step. There the magnetic latent image forming step to form a magnetic latent image by controlling the write operation by the magnetic recording element, to the execution.

  According to the first aspect of the present invention, it is possible to reduce image disturbance due to a mounting angle error of the recording apparatus.

  According to the second aspect of the present invention, the mounting angle of the recording apparatus can be detected without using a complicated configuration.

  According to the third aspect of the present invention, the position where the magnetic latent image is formed by the recording apparatus can be adjusted.

  According to the fourth aspect of the present invention, the recording apparatus can be moved to the magnetic latent image forming position with a simple operation.

  According to the fifth aspect of the present invention, it is possible to reduce image disturbance due to a mounting angle error of the recording apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a magnetic latent image is formed on the magnetic latent image holding member using a liquid developer in which a magnetic toner is dispersed in an aqueous medium. An image forming apparatus that forms an image by developing the image, that forms an image by a so-called liquid magnetography method will be described.

  FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus according to the present embodiment. As shown in the figure, the image forming apparatus 10 of this embodiment includes a magnetic drum 12, a magnetic recording head 14, a developing device 16, a transfer roller 24, an intermediate transfer body 26, and a demagnetizing device 28. .

  The magnetic drum 12 has a cylindrical shape, and its peripheral surface is a magnetic latent image recording layer 12A. A magnetic latent image is formed by being locally magnetized. The magnetic drum 12 is rotationally driven in the direction of the rotational direction A.

  A magnetic recording head 14, a developing device 16, a transfer roller 24, and a demagnetizing device 28 are arranged in this order along the rotation direction A on the outer periphery of the magnetic drum 12.

  The magnetic recording head 14 forms a magnetic latent image by locally magnetizing the magnetic latent image recording layer 12A of the magnetic drum 12 by generating magnetic flux locally. The detailed configuration and operation of the magnetic recording head 14 will be described later.

  The developing device 16 stores a liquid developer 20 in which the magnetic toner 22 is dispersed in an aqueous medium, and a developing roller 18 that conveys the liquid developer stored in the reservoir 20 to the peripheral surface of the magnetic drum 12. And. Further, in the developing device 16, the amount of the liquid developer stored in the storage tank 20 is adjusted so that a part of the developing roller 18 is immersed in the liquid developer.

  The magnetic toner 22 contained in the liquid developer conveyed to the peripheral surface of the magnetic drum 12 by the developing roller 18 adheres to the magnetic latent image formed on the magnetic drum 12 and develops the magnetic latent image. In the figure, the hatched area of the magnetic latent image recording layer 12A is a magnetized area (area to which the magnetic toner 22 adheres).

  The developing roller 18 only needs to be capable of transporting the liquid developer, so that the toner may be magnetically adsorbed using a magnet roll, or the liquid developer may be adsorbed using a sponge roll. Also good.

  The transfer roller 24 brings the magnetic toner 22 adhered to the circumferential surface of the magnetic drum 12 to the intermediate transfer member 26 by bringing the intermediate transfer member 26 conveyed in the direction of arrow C by a conveyance roller (not shown) into close contact with the magnetic drum 12. Transfer.

  The degaussing device 28 is provided in a long shape in the direction of the rotation axis of the magnetic drum 12, and when a magnetic latent image is newly formed by the magnetic recording head 14, the magnetic latent image formed on the magnetic latent image recording layer 12A is displayed. Used to erase. The magnetic recording head 14 locally magnetizes the circumferential surface of the magnetic drum 12, whereas the degaussing device 28 applies a magnetic field to the circumferential surface of the magnetic drum 12 in the same manner over the entire width, thereby causing a magnetic latent. Erase the image.

  FIG. 2 shows the configuration of the magnetic recording head 14. As shown in the figure, in this embodiment, a guide rail 15 is provided along the direction of the rotation axis of the magnetic drum 12. The magnetic recording head 14 is attached to the guide rail 15 and is slid and moved on the guide rail 15 in a moving direction D orthogonal to the rotational direction A by a driving mechanism (not shown).

  FIG. 3A schematically shows the configuration of the recording surface 14A of the magnetic recording head 14. Each rectangular area shown in the figure shows a recording element 13 provided in the magnetic recording head 14. As shown in the figure, the magnetic recording head 14 has n pieces in the rotation direction A (n = 20 in this embodiment) and m pieces in the movement direction D orthogonal to the rotation direction A (in this embodiment, m = 20) recording elements 13 are provided. In the present embodiment, the magnetic recording head 14 forms the magnetic latent image P in units of the recording surface 14A.

  Here, with reference to FIG. 4, the formation of the magnetic latent image by the magnetic recording head 14 according to the present embodiment will be described. Note that a black area in the drawing shows the recording element 13 that is driven so that an image is formed (toner adheres). Further, in the figure, the numerals indicated by using a hyphen (-) after the magnetic latent image form P indicate the order in which the magnetic latent image P is formed by the magnetic recording head 14. Although a large number of magnetic latent images P are actually formed, only a part of the magnetic latent images P is shown in FIG.

  An area between the SOS (latent image formation start position: Start Of Scan) 60 and the EOS (latent image formation end position: End Of Scan) 62 is an image forming area 64, and a non-image is formed between the EOS 62 and the SOS 60. A formation region 66 is formed. SOS 60 and EOS 62 are optically or magnetically readable marks on the magnetic drum 12, and the rotational position of the magnetic drum 12 is read by a reading sensor that reads the mark optically or magnetically (not shown). Is detected.

  As shown in the figure, in the present embodiment, the magnetic recording head 14 is moved to a preset recording start position of the guide rail 15, and the first magnetic latent head is changed according to the SOS 60 of the rotating magnetic drum 12. Image formation is performed, and a magnetic latent image P1-1 is formed. Thereafter, the second magnetic latent image is formed at the timing when the magnetic drum 12 is rotated by the length in the rotation direction A of the formation region of the magnetic latent image P, and the magnetic latent image P1-2 is formed. In this manner, the magnetic latent images P1-1 to P1-n corresponding to the image data are repeatedly formed up to the EOS 62 of the magnetic drum 12.

  In this way, when the formation of the magnetic latent image for one round of the magnetic drum 12 is completed, the magnetic recording head 14 prevents the magnetic latent image forming area from facing the position where the recording surface 14A overlaps the latent image forming area P. It is slid according to the length of P in the moving direction D. Thereby, the magnetic latent images P2-1 to P2-n are formed in the same manner as the above-described formation of P1-1 to P1-n.

  By repeating this operation, magnetic latent images P3-1 to P3-n, P4-1 to P4-n,.

  During the formation of the magnetic latent image by the magnetic recording head 14, degaussing is not performed by the degaussing device 28, and the developing device 16 is separated from the magnetic drum 12. As for the transfer roller 24, the intermediate transfer member 26 may be separated from the magnetic drum 12 as a structure separated from the magnetic drum 12, or the intermediate transfer member 26 may be rotated as it is without separating the transfer roller 24. May be.

  FIG. 6A schematically shows an image Q obtained by forming the magnetic latent image P by the recording head 14 shown in FIG.

  Incidentally, as shown in FIG. 3B, the recording surface 14 </ b> A of the recording head 14 may be attached in a state inclined with respect to the rotation direction A of the magnetic drum 12.

  FIG. 5 shows the state of the magnetic latent image P and the magnetic drum 12 when the recording head 14 shown in FIG. 3B performs the same image formation control as in the example shown in FIG. . As shown in the figure, when the recording surface 14A is inclined, the magnetic latent images P partially overlap each other in the moving direction D of the recording head 14. In addition, a gap is left between the magnetic latent images P.

  FIG. 6B schematically shows an image Q obtained by forming the magnetic latent image P by the recording head 14 shown in FIG. As shown in the figure, in the image Q, a straight line should be originally formed, but a broken diagonal line is formed. Furthermore, as shown by QE in the figure, a part of the image protrudes.

  Therefore, in the present embodiment, the mounting angle of the recording surface 14A of the recording head 14 is detected, and image formation control is executed according to this mounting angle.

  In the image forming apparatus 10 according to the present embodiment, a magnetic detection sensor 42 is provided on the downstream side in the rotation direction A of the magnetic drum 12 of the magnetic recording head 14, and a reference line 44 is provided on the peripheral surface of the magnetic drum 12. .

  The magnetic detection sensor 42 includes a plurality of detection elements that detect the magnetism of the circumferential surface of the magnetic drum 12 over the entire width of the magnetic drum 12 in the rotational axis direction. The reference line 44 is a region magnetized in a line along the rotation axis direction on the peripheral surface of the magnetic drum 12. The reference line 44 is formed in advance in the non-image forming area 66 on the magnetic drum 12.

  FIG. 7 is a functional block diagram relating to the mounting angle detection processing and image formation control of the recording head 14 according to the present embodiment. As shown in the figure, image formation control is executed by an image processing unit 50, an image memory 52, and a magnetic recording head drive control unit 54.

  The image processing unit 50 performs preset image processing such as binarization processing for binarizing gradation values on image data indicating an image to be formed by the image forming apparatus 10. The image memory 52 temporarily stores the image data output from the image processing unit 50.

  The magnetic recording head drive control unit 54 includes a movement control unit 56 and a recording element drive control unit 58. The movement control unit 56 controls the movement of the magnetic recording head 14 on the guide rail 15. The recording element drive control unit 58 controls the driving states of the 400 recording elements 13 provided on the recording surface 14 </ b> A based on the image data stored in the image memory 52.

  On the other hand, the attachment angle detection process is mainly executed by the magnetic recording head drive control unit 54, the magnetic detection sensor 42, and the attachment angle deriving unit 46. The output end of the magnetic detection sensor 42 is connected to the input end of the mounting angle deriving unit 46. The output end of the mounting angle deriving unit 46 is connected to the image processing unit 50 and the magnetic recording head drive control unit 54.

  Here, an angle detection latent image formation instruction is input to the magnetic recording head drive control unit 54 when the attachment angle detection process is executed. When an angle detection latent image formation instruction is input, the recording element drive control unit 58 drives the recording elements 13 for one line arranged in the arrow D direction of the magnetic recording head 14 to detect the angle on the magnetic drum 12. A latent image 45 is formed.

  The attachment angle deriving unit 46 derives the attachment angle based on the detection timing of the angle detection latent image 45 by the magnetic detection sensor 42 and the detection timing of the reference line 44.

  FIG. 8 shows an example of the relationship between the reference line 44 detected by the magnetic detection sensor 42 and the angle detection latent image 45. In the magnetic detection sensor 42, detection elements x and y that detect both end portions of the angle detection latent image 45 are used. In addition, the time from the detection of the angle detection latent image 45 by the detection elements x and y to the detection of the reference line 44 is defined as T1 and T2, respectively. Note that the times T1 and T2 are measured using a count value of a counter (not shown).

  The example shown in FIG. 8A is a case where the mounting angle of the recording surface 14A is 0 degree. As shown in the figure, when the attachment angle is 0 degree, the angle detection latent image 45 is a straight line parallel to the reference line 44. Therefore, T1 = T2.

  The example shown in FIG. 8B is a case where the mounting angle of the recording surface 14A is 5 degrees. As shown in the figure, when the recording surface 14A is inclined, T1 ≠ T2.

  FIG. 8C shows an example in which the magnetic detection sensor 42 is attached with an inclination. As shown in the figure, even in this case, the relative position between the reference line 44 and the angle detection latent image 45 does not change, so the relationship between T1 and T2 does not change.

  Thus, the attachment angle deriving unit 46 can derive the attachment angle from the relationship between T1 and T2. In addition, a table indicating the mounting angle corresponding to the absolute value of the difference between T1 and T2 may be stored in advance and derived using the table, or an arithmetic expression for deriving the mounting angle is stored in advance. In addition, it may be derived using an arithmetic expression.

  The image processing unit 50 includes a rotation processing unit 48 that rotates image data to be formed by the magnetic recording head 14 in accordance with the attachment angle derived by the attachment angle deriving unit 46.

  As shown in FIG. 9, for example, when the attachment angle of the recording surface 14A is α degrees, if the image data a is output as it is, the output image b becomes an image inclined by α degrees. Therefore, in the present embodiment, when the mounting angle of the recording surface 14A is α degrees, the rotation processing unit 48 rotates the image data a by −α degrees before outputting. As a result, the output image d has no inclination.

  On the other hand, as shown in FIG. 5, when the magnetic latent image P is formed by performing the same control as usual when the recording surface 14 </ b> A is tilted, each magnetic latent image P is recorded on the recording head 14. In the moving direction D, they may partially overlap each other or a gap may be left between each magnetic latent image P.

  Therefore, in this embodiment, as shown in FIG. 10A, the movement control unit 56 changes the movement amount on the guide rail 15 so that the recording areas overlap so that a magnetic latent image can be formed without gaps. At the same time, the formation timing of the magnetic latent image P by the recording element drive control unit 58 is changed. Further, the recording elements 13 (recording elements indicated by solid lines in the figure) where the magnetic latent images overlap are not driven so as not to form latent images overlappingly (see FIG. 10B).

  Then, as shown in FIG. 11A, the recording element drive control unit 58 removes the recording element 13 that is not driven, and the image based on the image data rotated with the movement amount and the image formation timing changed. Perform recording.

  In FIG. 11B, an image output by driving the recording element 13 as shown in FIG. 11A is shown as an example. As shown in the figure, the tilt of the output image is reduced.

  Hereinafter, the operation of the present embodiment will be described.

  FIG. 12 shows the flow of the attachment angle detection process for detecting the attachment angle of the recording surface 14A of the magnetic recording head 14. Hereinafter, the attachment angle detection process according to the present embodiment will be described with reference to FIG.

  The attachment angle detection process may be executed when the power is turned on or when a new magnetic latent image is formed, or may be executed by a user's specification.

  First, in step 100, the angle detection latent image 45 is formed by the magnetic recording head 14, and in the next step 102, magnetic detection by the magnetic detection sensor 42 is started.

  In the next step 104, the detection of the angle detection latent image 45 is waited, and then the process proceeds to step 106 to store the detection element number that detected the angle detection latent image 45 and the count value of the counter when detected. Then, the process proceeds to step 108.

  In step 108, it is determined whether or not the number of detection element numbers that have detected the angle detection latent image 45 is less than 20, and if the determination is affirmative, the process returns to step 104 again.

  On the other hand, if a negative determination is made in step 108, the process proceeds to step 110, the detection elements x and y are specified, and then the process proceeds to step 112 to wait for detection of the reference line 44. In the next step 114, the detection element number in which the reference line 44 is detected and the count value of the counter when it is detected are stored, and then the process proceeds to step 116. In step 116, it is determined whether or not the reference line 44 is detected by the detection elements x and y. If the determination is negative, the process proceeds to step 112 again.

  On the other hand, when an affirmative determination is made at step 116, the routine proceeds to step 118, where the time is determined based on the count value when the angle detection latent image 45 is detected by the detection elements x and y and the count value when the reference line 44 is detected. T1 and T2 are derived, and then the process proceeds to step 120 to derive an attachment angle, and then the main attachment angle detection process is terminated.

  The attachment angle α of the recording surface 14A of the magnetic recording head 14 thus derived by the attachment angle detection process is output to the rotation processing unit 48 and the magnetic recording head drive control unit 54 of the image processing unit 50.

As a result, the rotation processing unit 48 rotates the image data by −α. In the magnetic recording head drive control unit 54, the movement control unit 56 changes the amount of movement of the recording head 14 on the guide rail 15 according to the mounting angle α, and the recording element drive control unit 58 sets the mounting angle α to the mounting angle α. Accordingly, the non-driven recording element 13 is determined and the printing timing is changed.
Here, as shown in FIG. 13, in the non-image forming area 66 on the magnetic drum 12, for example, a one-dot magnetic latent image as a positioning mark 70 at a position corresponding to the amount of movement changed by the movement control unit 56. May be formed, and when the magnetic recording head 14 is moved, the amount of deviation may be detected and finely adjusted using the positioning mark 70.

  In this case, until the magnetic recording head 14 faces the recording position of the positioning mark 70, the magnetic recording head 14 is moved on the guide rail 15 in accordance with the movement amount changed in advance. The positioning mark 70 is read by the recording element 13 of a predetermined line of the magnetic recording head 14 at a timing facing the recording position.

  As shown in FIG. 14A, when the positioning mark 70 is read by the recording element 13A serving as a positioning reference, it can be determined that it has moved to the correct position. Do not move.

  Further, as shown in FIG. 14B, when the positioning mark 70 is read by the recording element 13 in the vicinity of the recording element 13A serving as a positioning reference, it can be determined that the amount of movement is insufficient. Therefore, the magnetic recording head 14 is moved along the guide rail 15 in accordance with the number 76 of elements from the recording element 13A serving as a reference to the recording element 13 read. In the example shown in the figure, the pixel is moved in the arrow D direction by 8 pixels.

  As shown in FIG. 14C, when the positioning mark 70 is read by the recording element 13 on the side opposite to the recording element 13A which is a positioning reference, it can be determined that the next positioning mark 70 has been detected. That is, it is determined that the amount of movement is too large, and on the contrary, the number of elements 76 corresponding to the position of the recording element 13 that has read the positioning mark (for 6 pixels in the example shown in the figure) is opposite to the arrow D. The magnetic recording head 14 is moved back in the direction.

  Furthermore, as shown in FIG. 14D, there are cases where two positioning marks 70 are read. This occurs when the amount of movement at one time is changed to be small. In this case, the shift amount is detected with priority given to the positioning mark 70 on the left side of the drawing. In the example shown in the figure, one pixel is moved in the arrow D direction.

  The positioning mark 70 may be a line-shaped positioning mark 70L as shown in FIG. By using the line-shaped positioning mark 70L, it is possible to move the line-shaped positioning mark 70L by tracing the determination described with reference to FIG. 14. Therefore, the positioning mark 70 shown in FIG. 13 is used. In comparison, the positioning accuracy is increased.

  It should be noted that the configuration of the image forming apparatus 10 and the flow of various processes described in the above embodiment are merely examples, and it goes without saying that they can be appropriately changed without departing from the gist of the present invention.

  For example, in the above-described embodiment, the configuration using the liquid developer as the image forming apparatus 10 has been described. However, the present invention is not limited to this, and a so-called dry type using a developer using powder magnetic toner is used. The present invention may be applied to other image forming apparatuses.

  In addition, some or all of the functions of the various processes of the present invention described in the above embodiments can be realized by a program that can be executed by a computer. In that case, the program, data used by the program, and the like can be stored in a computer-readable storage medium. As a storage medium, the reading unit provided in the hardware resource of the computer causes a change state of energy such as magnetism, light, electricity, etc. according to the description content of the program, and the corresponding signal format Thus, the description content of the program can be transmitted to the reading unit. For example, a magneto-optical disk, an optical disk (including a CD and a DVD), a magnetic disk, a memory (including an IC card and a memory card), and the like. Of course, these storage media are not limited to portable types.

  The programs are stored in these storage media, and the programs are read from the computer by, for example, mounting these storage media on the reading unit or interface of the computer, stored in the internal memory or the hard disk, and executed by the CPU. Thus, various processing functions of the present invention can be realized. Alternatively, the functions of the present invention can be realized by transferring the program to a computer via a network, etc., receiving the program at the communication unit and storing it in the internal memory or hard disk, and executing the program by the CPU. May be. In addition, the computer can be connected to various devices via an interface. For example, a display device for displaying information and an input device for inputting information by a user are also connected.

  Of course, some functions may be configured by hardware, or all may be configured by hardware. Alternatively, it can be configured as a program including the present invention together with other configurations.

1 is a schematic diagram illustrating a configuration of an image forming apparatus according to an embodiment. The configuration of the magnetic recording head of the image forming apparatus according to the embodiment is shown. 2A and 2B are schematic diagrams illustrating a configuration of a recording surface of a magnetic recording head of an image forming apparatus according to an embodiment, in which FIG. 3A illustrates a case where an attachment angle is 0 degree and FIG. It is explanatory drawing about formation of the magnetic latent image by the magnetic-recording head based on Embodiment. The state of the magnetic drum when the image forming control similar to the example shown in FIG. 4 is executed on the recording head shown in FIG. 3B is shown. (A) is a schematic diagram showing an image Q obtained by forming a magnetic latent image P by the recording head shown in FIG. 3 (A), and (B) is a magnetic latent image by the recording head shown in FIG. 3 (B). It is a schematic diagram showing an image Q obtained by forming P. FIG. 5 is a functional block diagram relating to a mounting angle detection process and image formation control of a recording head according to an embodiment. An example of the relationship between the reference line detected by the magnetic detection sensor and the angle detection latent image is shown. The example shown in (A) is when the mounting angle of the recording surface is 0 degree. The example shown in (B) is a case where the mounting angle of the recording surface is 5 degrees. (C) shows an example of the case where the magnetic detection sensor is attached at an angle. When the mounting angle of the recording surface 14A is α degrees, the input image data a, the output image b obtained by outputting it as it is, the image data c obtained by rotating the image data a by −α degrees, and the image data c are output. It is a schematic diagram which shows the output image d obtained by doing in this way. It is explanatory drawing about the change of the moving amount | distance of the magnetic recording head on a guide rail, the change of the formation timing of a magnetic latent image, and the change of a drive element. FIG. 10 is an explanatory diagram when image recording is executed based on image data rotated with a movement amount and image formation timing changed. It is a flowchart which shows the flow of the attachment angle detection process which concerns on embodiment. It is explanatory drawing in the case of forming a positioning mark in the non-image formation area on a magnetic drum. It is explanatory drawing regarding the reading of the positioning mark by a magnetic recording head, and adjustment of the moving amount of a magnetic recording head. It is explanatory drawing at the time of making a positioning mark into a line form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming device 12 Magnetic drum 12A Magnetic latent image recording layer 13 Recording element 14A Recording surface 14 Magnetic recording head 15 Guide rail 16 Developing device 18 Developing roller 20 Storage tank 22 Magnetic toner 24 Transfer roller 26 Intermediate transfer body 28 Demagnetizing device 42 Magnetic Detection sensor 44 Reference line 45 Angle detection latent image 46 Angle deriving unit 48 Rotation processing unit 50 Image processing unit 52 Image memory 54 Magnetic recording head drive control unit 56 Movement control unit 58 Recording element drive control unit 64 Image forming area 66 Non-image Formation area 70 Mark 70L Mark

Claims (5)

A magnetic recording device for forming a magnetic latent image in units of recording surfaces in which a plurality of magnetic recording elements capable of writing magnetic information on the peripheral surface of a rotationally driven magnetic drum are arranged in the main scanning direction and the sub-scanning direction;
Position control means for controlling the formation position of the magnetic latent image by the magnetic recording device;
Write control means for controlling the write operation by each magnetic recording element based on image information;
Detection means for detecting the mounting angle of the magnetic recording device;
Rotation processing means for rotating image information recorded by the magnetic recording device before recording according to the angle detected by the detecting means;
The magnetic recording element that controls the writing operation is determined according to the angle detected by the detecting means, so that the shape of the recording surface is substantially changed, and the magnetic latent image is formed without a gap according to the change. The position control unit and the write control unit are configured to control the formation position of the magnetic latent image and control the writing operation by the magnetic recording elements based on the image information rotated by the rotation processing unit. Control means for controlling
An image forming apparatus. A reference line formed as a magnetic latent image which cannot be rewritten in advance on the peripheral surface of the magnetic drum;
Detection means capable of detecting a magnetic latent image formed on the peripheral surface of the magnetic drum;
Further comprising
The control means is for detecting an angle indicating a straight line on the magnetic drum by any one row of magnetic recording elements arranged on the recording surface of the magnetic recording apparatus when the detecting means detects the mounting angle. Controlling the write control means to form a magnetic latent image;
The detection means detects the mounting angle of the magnetic recording device with respect to the magnetic drum by specifying the positional relationship between the angle detection magnetic latent image and the reference line based on the detection result of the magnetic latent image by the detection means. The image forming apparatus according to claim 1.   The control means records the formation position information of the magnetic latent image in the rotational axis direction of the magnetic drum in advance on the peripheral surface of the magnetic drum and is formed on the peripheral surface of the magnetic drum by the magnetic recording device. The image forming apparatus according to claim 1, wherein the position control unit is controlled to position the magnetic recording apparatus using the formed position information.   The image forming apparatus according to claim 3, wherein the formation position information formed in advance on the peripheral surface of the magnetic drum is a continuous linear shape along the movement locus of the magnetic recording apparatus. On the computer,
Detects the mounting angle of a magnetic recording device that forms a magnetic latent image in units of recording surfaces in which a plurality of magnetic recording elements capable of writing magnetic information on the circumferential surface of a rotationally driven magnetic drum are arranged in the main scanning direction and sub-scanning direction. Detection step,
A setting step for setting a rotation angle for rotating image information recorded by the magnetic recording device before recording according to the angle detected by the detection step;
A determination step of determining a magnetic recording element that controls a writing operation according to the angle detected by the detection step;
A derivation step for deriving a formation position of the magnetic latent image so that the magnetic latent image is formed without a gap according to the shape of the recording surface changed by the determination step;
A magnetic latent image forming step of forming a magnetic latent image by controlling a writing operation by each of the magnetic recording elements based on image information rotated at a rotation angle set by the setting step;
An image formation control program for executing

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