JPH0360106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrophotographic apparatus using the so-called Carlson process for copying an image of a document surface onto plain paper, and more particularly, to an electrophotographic apparatus that copies an image of a document surface onto plain paper. The present invention relates to an electrophotographic apparatus capable of forming a copy image by moving the image to a desired position on a copy surface.

Configuration of Conventional Example and Its Problems FIG. 1 shows a perspective view of essential parts of an example of a conventional electrophotographic apparatus using the Carlson process. In FIG. 1, the photoreceptor 10 is placed at the arrow 1 when copying.
First, a uniform charge is applied to the surface by corona discharge from the charger 14. The original surface 18 of the original 16 is irradiated with light by a fluorescent lamp 20 serving as an original irradiation means, and a reflected image thereof is formed on the photoreceptor 10 through an imaging optical system such as an optical fiber 22 having a lens effect. By feeding the original 16 in the right direction as indicated by arrow 1 in synchronization with the rotation of the photoreceptor 10, the image of the original surface is sequentially exposed on the photoreceptor 10 from the right end to the left end of the original surface 18. . In the developing device 24, toner is attached to the photoreceptor 10 according to the charge distribution of the electrostatic latent image generated on the photoreceptor 10 by exposure of the original surface image, and a developed image is formed on the photoreceptor 10. This developed image is transferred onto the plain paper 11 by the transfer charger 25 to form a copy image, but in the conventional electrophotographic apparatus, the original 16 is placed at a predetermined position on the original platen 26. , in the main scanning direction, the time at which the document irradiation means 20 irradiates the document surface 18 and starts scanning the document surface 18, which is performed by moving the document table 26 in the right direction as indicated by arrow 1; The time at which the scanning drive of the photoreceptor 10 is started for sequentially forming the reflected images of the document surface 18 is made to substantially coincide with the time at which the scanning drive of the photoreceptor 10 is started, and furthermore, the time when the scanning drive of the photoreceptor 10 is started has a predetermined phase relationship. By supplying copy paper and making the edge of the copy paper substantially coincide with the edge of the electrostatic latent image on the photoreceptor 10 formed by exposure, the image of the document surface on the document surface 18 is created. and the copy image on the copy paper are arranged in a one-to-one positional relationship,
In addition, in the sub-scanning direction perpendicular to the main scanning direction (arrows 1 and 1' directions), the document table 26 is
The document 16 is held at a constant position relative to the end surface 28 of the photoreceptor 10 in the sub-scanning direction, and the document 16 is placed at a constant position on the document table 26. On the other hand, by supplying the copy paper at a fixed position in the sub-scanning direction, the positional relationship between the original surface image on the document surface 18 and the copy image on the copy paper is made to be one-to-one. . On the other hand, when copying a certain document surface, if you want to form a copy image by positioning a specific part of the document surface, for example, a document image part located at the edge of the document surface, at the center position on the copy surface. occurs often. In such cases, in conventional electrophotographic apparatuses, the placement position of the original 16 on the original platen 26 is shifted from a predetermined position in rough register, and the copying process is repeated several times until the desired copy image position is obtained. Usually, the operations are repeated, which wastes copying time and costs, and results in problems such as it being difficult to obtain a desired copy image.

Purpose of the Invention The present invention is intended to solve such conventional problems, and while placing the original at a predetermined position on the original platen, the original image portion located at an arbitrary position on the original surface image of the original can be moved to a desired position. It is an object of the present invention to provide an electrophotographic apparatus that can obtain a copy image that has been moved to a certain position.

Composition of the Invention The electrophotographic apparatus of the present invention is capable of moving a document table on which a document is placed in a direction perpendicular to the main scanning direction of the document surface. The structure is configured such that the positional relationship of the document surface with respect to the photoconductor can be changed, thereby moving the document image portion located at an arbitrary position on the document surface to a desired position in a direction perpendicular to the main scanning direction. This makes it possible to obtain a copy of the image. Furthermore, it has a detection surface corresponding to the original surface of the original to be copied, and a position detection means for detecting a specified position within the detection surface, and a position detection means for pressing a desired position on the detection surface of the position detection means. The document surface image, which is directly indicated and detected on the document surface by the position detecting means and the indicating pen, can be moved by the amount of movement specified by the movement amount specifying means. Therefore, it is possible to accurately specify the portion of the document image on the document that is desired to be transferred.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a perspective view of essential parts showing the structure of the document table and the vicinity of the photoreceptor of an embodiment of the electrophotographic apparatus of the present invention.
In FIG. 2, the original platen 26 is mounted on the holding table 32 by a holder 30, and the photoreceptor 1 is moved by the original plate driving means including a motor 33.
The photoreceptor is driven in the direction of the rotation axis of 0, that is, in the sub-scanning direction (indicated by arrows 36 and 36') perpendicular to the main scanning direction of exposure during copying (indicated by arrows 1 and 1'). The phase position of the document surface 18 with respect to the end surface 28 of the document 10 can be changed. A copy sheet 11 on which the developed image formed on the photoreceptor 10 is transferred to represent a copy image is attached to the photoreceptor 1.
It is supplied in a fixed positional relationship with respect to the end face 28 of 0, and in this respect it is similar to the conventional example. In addition, the original 16 is always placed at a specified fixed position on the original table 26, and this point is also the same as in the case of normal copying in the conventional example. In the embodiment, as described above, the position of the document surface 18 relative to the photoreceptor end surface 28 can be changed by moving the document table 26 itself in the sub-scanning direction perpendicular to the main scanning direction using the document table driving means. can. Therefore, the document surface image portion 34 located at the near end of the document surface 18 in FIG.
For example, if you want to obtain a copy image positioned near the center on the copy screen, first move the document table 26 in the direction of the arrow 36 by operating the document table drive means. It can be moved. As a result, the position where the document surface image portion 34 is exposed on the photoreceptor 10 moves in the direction of the arrow 36, while the copy paper 11 is exposed to the end surface 28 of the photoreceptor 10.
Since it is always supplied in a constant positional relationship with respect to
The position at which the electrostatic latent image corresponding to the document surface image portion 34 whose exposure position has been moved as described above and the developed image obtained by developing this electrostatic latent image is transferred onto the copy paper 11 is also the same. It moves in the direction of the arrow 36 on the copy paper 11, and a copy image can be obtained in which the document surface image portion 34 is located near the center on the copy screen.

FIG. 3 is a perspective view of essential parts showing the overall configuration of this embodiment. In FIG. 3, a fluorescent lamp 20 and a developing device 2 are shown.
A large number of light emitting diodes 42 serving as photoconductor irradiation means for directly irradiating the photoconductor 10 are arranged in an array along the width direction of the photoconductor 10. The amount of light emitted from the light emitting diode 42 can be arbitrarily set by the amount of current supplied to the light emitting diode. and is connected to the light emitting diode 42. The control unit 44 further includes:
A position detection plate 46 constituting a position detection means for placing the original 16 and detecting a specified position on the original surface 18 of the original 16, and an instruction for specifying the position on the original surface 18. A pen 48 is connected via a flexible wiring board 47 and a cord 49, respectively. The position detection plate 46 has orthogonal coordinates formed from an X-axis and a Y-axis with a coordinate origin 50 as the origin. The X-axis and Y-axis are divided at a required interval, and the position on the position detection plate 46 in the XY plane defined by the X-axis and Y-axis can be coordinated. Manuscript 1
6 aligns one end with the coordinate origin 50,
The original surface 18 should be facing upward, and the edge of the original should be aligned with the above
It is placed on the position detection plate 46 along the Y axis. Next, an example of specifying a position on the position detection plate 46 within the XY plane using the pointing pen 48 will be explained with reference to FIG. First, the above instruction pen 4
By pressing the position detection plate 46 at the positions of two points A (X ₁ , Y ₁ ) and B (X ₂ , Y ₂ ) with 8, the two points A and B are input to the control section 44 Based on this input, the point A indicated by diagonal lines in Figure 4 is
(X ₁ , Y ₁ ), C (X ₂ , Y ₁ ), B (X ₂ , Y ₂ ), D (X ₁ ,
The rectangular area surrounded by Y ₂ ) is calculated and stored as the specified position. This control unit 44 is further connected to a document table drive control circuit 51 that drives and controls document table driving means including a motor 33 for moving the document table 26 in the directions of arrows 36 and 36'. As described above, the position signal of the rectangular area ACBD specified on the document surface 18 is transmitted to the document table movement control circuit 51 to control the drive of the document table driving means. In order to perform the drive control of the document table driving means, the control section 44 includes the document table 2.
A movement amount designation means 52 is provided for designating the amount by which 6 is to be moved in the directions of arrows 36, 36'.

The document 16 whose position on the document surface has been specified as described above is transferred onto the document table 26 with the document surface 18 facing the document table 26. At this time, the document table 26 has an X' axis with a starting point 54 where the phase of the document table 26 matches the phase of the photoreceptor 10 when exposing the document surface image onto the photoreceptor 10 as the origin.
A document placement position is formed by the Y' axis, and when transferring the document 16, the end point of the document 16 is aligned with the coordinate origin 50 on the position detection plate 46, the X axis, and the Y axis. By aligning the edges of the original 16, which are aligned with the starting point 54, the X' axis, and the Y' axis, respectively, the coordinates on the position detection plate 46 and the original platen 26 are matched, and the original The phase consistency between the starting point 54 on the table 26 and the photoreceptor 10 can be maintained.

With respect to the document 16 transferred onto the document table 26 in this way, the side or side of the rectangle ACBD
A movement amount specifying means 52 provided in the control section 44 determines how much BC is to be moved in the directions of arrows 36 and 36' by the document table driving means including the motor 33.
The required document image movement can be performed by specifying the . Further, when the specified position is converted into coordinates in this way, the control unit 44 converts the specified position coordinates and a coordinate position corresponding to, for example, the center position on the copy drawing.
The amount of movement required to move the specified position to the center position on the copying surface can be calculated by comparing the above. Therefore, the control section 44 can be provided with a movement amount specifying means that can preset the destination position, such as "move to the center position", which is convenient for creating a copy image. Another possible method for presetting the amount of movement is to provide several selection buttons with preset movement distances on the document surface.

Furthermore, as in the embodiment shown in FIG. 3, if the specified position on the document surface can be detected, for example, after moving the document image portion corresponding to the above-mentioned rectangle ACBD to the desired position, the other portions of the document image are It is also possible to erase only the rectangular ACBD document surface image on the copy screen. That is, first, a first exposure is performed on the photoreceptor 10 by the fluorescent lamp 20 to expose an image of the document surface whose phase is shifted by the required amount in the directions of the arrows 36 and 36' as described above. An electrostatic latent image corresponding to the original surface image is formed on the photoreceptor 10. Thereafter, a second direct exposure to the photoreceptor 10 is performed by the light emitting diode 42, and the first exposure and second exposure are superimposed. In the above second exposure, a rectangular area on the document surface is
The light emitting diode provided between the width _{1 and 2} corresponding to ACBD has a length corresponding to the rectangular area ACBD.
It is controlled by the control section 44 so that it is turned off only during Y ₁ Y ₂ and turned on during the other periods with an amount of light that can erase the electrostatic latent image corresponding to the image on the document surface.

The first exposure forms an electrostatic latent image on the document surface 18, and the second exposure forms an electrostatic latent image on the rectangular area.
The photoreceptor 10, from which the electrostatic latent image in areas other than ACBD has been erased, is developed by the developing device 24 to form a developed image. Further, the second exposure can also be made to act as bias exposure to the photoreceptor, and by selecting the amount of light emitted from the light emitting diode 42 to a required amount, the entire document portion corresponding to the rectangular area ACBD can be exposed. The amount can be increased.
This reduces the residual charge only in the portion corresponding to the rectangular area ACBD of the electrostatic latent image formed by the first exposure, and reduces the density of the developed image formed by the developing device 24. can be done.
Therefore, for example, if the rectangular area ACBD has a background concentration, this rectangular area
It is also possible to remove so-called fog in the copied image of the ACBD area, and a good copied image can be obtained.

In the above-described embodiment, the movement of the document image portion was explained in the case where the supply of the copy paper 11 to the photoreceptor 10 was maintained in a constant positional relationship. A similar effect can be obtained by moving the supply position of the copy paper 11 to the photoreceptor 10 in the second direction while keeping the supply position constant.

Effects of the Invention As is clear from the above description, the electrophotographic apparatus of the present invention has the following advantages: It is possible to change the positional relationship of the document surface with respect to the photoreceptor in a direction perpendicular to the main scanning direction, thereby allowing the document image portion located at an arbitrary position on the document surface to be moved perpendicular to the main scanning direction. It is possible to obtain a copy image that has moved to a desired position in a certain direction. Furthermore, it has a detection surface corresponding to the original surface of the original to be copied, and a position detection means for detecting a specified position within the detection surface, and a position detection means for pressing a desired position on the detection surface of the position detection means. Therefore, by pressing the detection surface of the position detecting means through the document with the direction pen, the position of the part to be copied on the document surface, that is, the part to be moved, can be directly determined. Instructions can be given on the document surface, and parts of the document surface that are invisible to the operator during copying can be accurately moved to desired positions. Here, an example of the effects obtained by the present invention will be explained with reference to FIG. 5. 5A shows the surface of a document to be copied, and an image is written on the document surface 18 in a diagonally shaded area surrounded by a solid line. If only the part indicated by the broken line at the end of the image is the necessary image to be copied, by using the electrophotographic apparatus of the present invention, as shown in FIG. 5b,
It is possible to obtain an easy-to-see copy image in which only the necessary portion is left, other unnecessary portions are erased, and the necessary portion image is shifted to a desired central position.
Of course, it goes without saying that the shape of the required image area may be arbitrary.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part showing an example of a conventional electrophotographic apparatus, FIG. The figure is a perspective view of essential parts showing the overall configuration of an embodiment of the present invention, FIG. 4 is a plan view showing a specified area on the document surface, and FIGS. 5 a and 5 b illustrate an example of the effects of the present invention. FIG. 3 is a perspective view showing the correspondence between a document surface and a copy surface for printing. 10... Photoreceptor, 14... Charger, 16... Original, 18... Original surface, 20... Fluorescent lamp, 22...
Optical fiber, 24...Developer, 25
...Transfer charger, 26...Document table, 28...Photoconductor end surface, 30...Holder, 32...Holding table, 33
...Motor, 34...Document surface image portion, 42...Light emitting diode, 44...Control unit, 46...Position detection plate, 48...Instruction pen, 51...Document platen movement control circuit, 52...Movement A means of specifying quantity.

Claims (1)

[Claims] 1 A document table on which a document is placed and configured to be movable in a direction perpendicular to the main scanning direction of the document surface, and a document table for scanning and irradiating the document surface of the document with light in the main scanning direction to obtain a reflected image. an original irradiation means, an imaging optical system for forming a reflected image of the original surface on a photoreceptor, and a photoreceptor that is scan-driven in a main scanning direction to sequentially form an image of the original surface. and a position detection means that has a detection surface corresponding to the original surface of the original to be copied and detects a specified position within the detection surface, and a position detection means that presses a desired position on the detection surface of the position detection means. an indicator pen for specifying a position, a movement amount specifying means for specifying the amount of movement of the document platen based on the detected position, and a movement amount specifying means for specifying the movement amount of the document table based on the detected position; a document table movement control means for moving the document table, a photoreceptor irradiation means for irradiating the photoreceptor surface with light, a signal of the position on the document surface detected by the position detection means and the indicator pen, and the movement amount specification. irradiation control means for controlling the amount of light irradiated onto the photoreceptor surface by the photoreceptor irradiation means in accordance with a signal of the amount of movement specified by the means; moving the original surface image directly instructed and detected by the movement amount specifying means, and first exposing the original surface image to the photoreceptor by the original irradiation means and the imaging optical system. and second exposure of the photoreceptor by the photoreceptor irradiation means, and the maximum exposure amount of the second exposure is used to erase the exposure pattern corresponding to the image of the document surface that is first exposed on the surface of the photoreceptor. 1. An electrophotographic apparatus, characterized in that the electrophotographic apparatus is configured such that at least a portion of an image of the document surface that is first exposed on the surface of the photoreceptor can be erased by setting the exposure amount to a value higher than the amount of light that can be exposed.