JPH0534660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrophotographic apparatus using a so-called Carlson process for copying an original image onto plain paper, and more specifically, for copying an original image onto plain paper by specifying a position on the original surface. The present invention relates to an electrophotographic apparatus that can control the amount of exposure to a photoreceptor according to the specified position on the document surface, and can perform various processing on the copied image according to the specified position.

Structure of a conventional example and its problems FIG. 1 shows a schematic structure of a main part of an example of a conventional electrophotographic apparatus using the Carlson process. In FIG. 1, photoreceptor 10 is rotating in the direction of arrow 12 when copying is performed, and first, a uniform charge is applied to the surface by corona discharge from charger 14. The document surface 18 of the document 16 is irradiated with light by a fluorescent lamp 20 serving as document 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. The document surface 1 is rotated in synchronization with the rotation of the photoreceptor 10.
The document surface images are sequentially exposed onto the photoreceptor 10 from the right end to the left end of the photoreceptor 8. In the developing device 24, toner is attached according to the charge distribution of the electrostatic latent image generated on the photoreceptor 10 by exposure of the original image, and a developed image is formed on the photoreceptor 10. This developed image is transferred onto the copy paper 11 by the transfer charger 25 to form a copy image.

By the way, when obtaining a copy image, there is a desire to perform various processing on the image, such as adjusting the density, erasing a specific part of the image, or leaving a certain part of the image.

However, in conventional electrophotographic apparatuses, the light source for exposing the photoreceptor is only a single fluorescent lamp 20.
Moreover, the exposure from this fluorescent lamp 20 is
This is exposure of a reflected image from the photoreceptor 10, and there is no irradiation means for directly irradiating the photoreceptor 10. Therefore, although it is possible to reduce the amount of exposure to the photoreceptor 10, increasing the amount of exposure requires a significant increase in the amount of light emitted from the fluorescent lamp 20, which is not practical. Even if you try to erase the original image, there are problems such as it is difficult to adjust the exposure amount by dividing the area according to the specified position because a light source such as a fluorescent lamp is used. It was difficult to control the copied image.

Purpose of the Invention The present invention eliminates such drawbacks of the conventional example, and by specifying the position of the document,
The object of the present invention is to provide an electrophotographic apparatus that can control the exposure of the photoreceptor according to the specified position on the document surface, and thereby perform various controls on the copied image according to the specified position. .

Structure of the Invention In order to achieve the above-mentioned object, the present invention includes a document table driving means for driving a document table, a document irradiation means for irradiating a document surface on the document table with light to obtain a reflected image, and a reflection device for the document surface on the document table. an imaging optical system for forming an image on the photoreceptor; and an imaging optical system installed parallel to the width direction of the photoreceptor to irradiate the surface of the photoreceptor, and divided into a plurality of parts in a direction perpendicular to the width direction of the photoreceptor. a photoconductor irradiation means arranged with light sources arranged side by side, a copy paper feeding means for feeding copy paper, a position indicating means for indicating the position on the document placement surface, and a photoconductor irradiation device configured to place a copy sheet on the document placement surface; position detecting means for detecting the position indicated by the position indicating means; function specifying means for selectively instructing the control functions of trimming, box, image movement, edge, and book for the image; The operation of the photoreceptor irradiation means is controlled to perform the function designated by the function designation means in accordance with the signal of the position on the document surface detected by the detection means, and the document table drive means or a control means for controlling the operation of the copy paper feeding means, and the control means controls the first exposure of the original surface image to the photoreceptor by the original irradiation means and the imaging optical system; A second exposure of the photoreceptor is performed by the photoreceptor irradiation means, and the first exposure and the second exposure are overlapped, and the function designation means includes an area designated by the position designation means. By indicating the control functions for the image, it is possible to perform various processing on the copied image, and it is also possible to easily select the type and selection of the processing functions.

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 an embodiment of the electrophotographic apparatus of the present invention. In FIG. 2, when copying, a photoconductor 10 rotates in the direction of an arrow 12, a charger 14 is placed around the photoconductor 10, and a document surface 18 of a document 16 placed on a document table 26 is irradiated with light. A fluorescent lamp 20 is provided as a document irradiation means, and an optical fiber 22 having a lens effect is provided as an imaging optical system. Above document table 2
6 is moved in the direction of arrow 30 by a document table drive motor 44 in synchronization with the rotation of the photoreceptor 10, thereby sequentially moving the document surface image from the right end to the left end of the document surface 18 placed on the document table 26. is exposed onto the photoreceptor 10.

Similar to a conventional electrophotographic apparatus, an electrostatic latent image is formed by applying an electrostatic charge to the photoreceptor 10 and exposing the image on the document surface, and the charge distribution of the electrostatic latent image is changed by the developing device 24. Accordingly, toner is attached and a developed image is formed on the photoreceptor 10. Furthermore, the photoreceptor 10
This developed image is transferred to the charger 25 on the copy paper 11 fed out by the copy paper feed motor 45 in synchronization with the rotation of the copy paper feed motor 45.
However, in this example,
Further, a large number of light emitting diodes 3 are arranged between the fluorescent lamp 20 as an original irradiation means and the developing device 24 as a photoreceptor irradiation means for directly irradiating the photoreceptor 10 with light.
2 are provided in an array along the width direction of the photoreceptor 10. The amount of light emitted from the light emitting diode 32 can be arbitrarily set by the amount of current flowing through the light emitting diode 32, and a control circuit 34 for controlling the amount of current flowing through the flexible wiring board 3
3 to the light emitting diode 32. A position detection plate 36 is connected to the control circuit 34 as a position detection means for placing one document 16 and detecting a specified position of the document 16 on the document placement surface 18. Detection plate 36
At the top, a function designation area 41 is provided for selecting and designating various functions of the electrophotographic apparatus.
An indicating pen 38 is connected to the position detecting plate 36 as a position indicating means for indicating a position on the document placement surface 18. The position detection plate 36 has orthogonal coordinates formed from an X-axis and a Y-axis with the coordinate origin 40 as the origin. The original 16 is placed on the position detection plate 36 with one end aligned with the coordinate origin 40, the original placing surface 18 facing upward, and the edges of the original aligned with the X-axis and the Y-axis. The position detection plate 36 and the pointing pen 38 constitute a so-called electromagnetic induction type coordinate input device that is electromagnetically coupled to each other.

Next, an example of specifying a position on the position detection plate 36 within the XY plane using the pointing pen 38 will be explained with reference to FIG. First, by pressing the position detection plate 36 at two points A (X ₁ , Y ₁ ) and B (X ₂ , Y ₂ ) with the pointing pen 38, the two
Points A and B are input to the control circuit 34, and based on these inputs, points A (X ₁ , Y ₁ ) shown with diagonal lines in FIG.
A rectangular area surrounded by C(X ₂ , Y ₁ ), B(X ₂ , Y ₂ ), and D(X ₁ , Y ₂ ) is calculated and stored as the indicated position. The function specification area 41 includes divided areas 41a and 41 for selecting required image controls.
b, 41c, etc. are provided, and by instructing one of these with the pointing pen 38, a necessary image control function is specified. Appropriate characters, figures, etc. representing each function are printed and labeled on the divided areas, and position indication and function selection can be performed with the same indication pen 38, achieving excellent operability. can.

The original 16 whose position on the original surface and function have been designated as described above is transferred onto the original table 26 so that the original 16 faces the original placing surface 18 . At this time, the document placement surface 18 has an X'-axis and a Y'-axis with the starting point 42 where the phase of the document table 26 matches the phase of the photoconductor 10 when exposing the document surface image onto the photoconductor 10 as the origin. The coordinate origin 4 on the position detecting plate 36 when the original 16 is transferred is
The end point on the original 16 that is aligned with 0, the edge of the original 16 that is aligned with the X axis, and the Y axis are the starting points 42,
By matching the X' and Y' axes, the coordinates on the position detection plate 36 and the coordinates on the document table 26 can be matched, and the phase of the starting point 42 on the document table 26 and the photoreceptor 10 can be adjusted. Consistency can be maintained. Although the connection relationship is not shown in the figure, the control circuit 34 also has a control function for the entire electrophotographic apparatus other than the light emitting diode 32, document table drive motor 44, and copy paper feed motor 45 through the wiring group 33.

Next, a copying operation in this embodiment will be described using as an example a case where an attempt is made to erase a document surface image corresponding to a rectangular area ACBD designated by the above-described procedure. First, a first exposure is performed to sequentially expose a reflected image of the document surface 18 onto the photoconductor 10 using the fluorescent lamp 20, and an electrostatic latent image corresponding to the document surface image is formed on the photoconductor 10. . Thereafter, the photoreceptor 1 is illuminated by the light emitting diode 32.
A direct second exposure to 0 is performed, and the first exposure and second exposure are superimposed. In the second exposure, a width X ₁ X ₂ corresponding to a rectangular area ACBD on the document surface is The control circuit 34 controls the light emitting diode provided in the control circuit 34 so that the light emitting diode provided in the rectangular area ACBD is illuminated only for a length X ₁ Y ₂ corresponding to the rectangular area ACBD with an amount of light emitted that can erase the electrostatic latent image corresponding to the image on the document surface. controlled by. By the above first exposure, the original surface 1
The photoreceptor 10 on which the electrostatic latent image No. 8 has been formed and the electrostatic latent image in the portion corresponding to the rectangular area ACBD has been erased by the second exposure is exposed to the developed image by the developing device 24. Form.

Note that in the above example, the portion corresponding to the rectangular area ACBD is erased, but conversely, if an area other than this portion is to be erased, the lighting of the light emitting diode 32 may be reversed.

Furthermore, it is of course possible to designate an area not only for a simple rectangle as shown in FIG. 3 but also for a rectangle with complex irregularities by indicating all the vertices with the pointing pen 38.

FIG. 4 is an explanatory diagram of a second example of position specification. The designated area is a simple rectangle (rectangle,
If you know that it is a square), you only need to specify the two vertices E (X ₁ , Y ₁ ) and F (X ₂ , Y ₂ ) as shown in Figure 4. That is, in the control circuit 34, other points G (X ₁ , Y ₂ ) and H (X ₂ , Y ₁ ) are generated from (X ₁ , Y ₁ ), (X ₂ , Y ₂ ) by calculation. By doing so, the same function as shown in FIG. 3 can be realized.

FIG. 5 is an explanatory diagram of a third example of position specification, in which a rectangular area I is specified by the method explained in FIG.
This is a case where a copy result is obtained by moving a distance d in the direction. After specifying the rectangular area I, move G (X ₁ , Y ₁ ), H (X ₂ , Y ₂ ) so that the distance between the two points in the X direction is d.
Specify. Based on this designation, the control circuit 34 controls the copying paper 10 in response to the rotation of the photoreceptor 10.
The copy paper feed motor 45 is controlled so that the copy paper feed motor 45 is fed with a delay of d. As a result, as shown in FIG. 5b, the copy image that should originally appear in J appears as K, which is apparently moved forward by d on the copy sheet.

Note that when transferring the image backward relative to the copy paper, the document table drive motor 4 is operated so that the document table 26 moves with a predetermined amount of delay relative to the rotation of the photoreceptor 10.
4 should be controlled.

FIG. 6 shows a fourth example of position designation, in which an image is erased with a constant width around the periphery of the document. By specifying one corner point L (X, Y) on the document surface 18, the control circuit 34 generates the remaining three points based on the size of the copy paper, and by the method explained in FIG. 3, the remaining three points are generated as shown in FIG. I get an image like .

FIG. 7 shows a fifth embodiment of position designation, which is used to avoid darkening of the central part when copying a book. Specify the width at which you want to erase the central part of the book using two points M (X ₁ , Y ₁ ) and N (X ₂ , Y ₂ ). As a result, by controlling the control circuit 34 to fully light up the light emitting diodes 32 between X ₁ and X ₂ , an image as shown in FIG. 7 can be obtained.

FIG. 8 shows divided areas 41a, 41b, 41c in the function designation area 41 of the control function explained above.
It is an example diagram of classification notation such as. 41a is the classification notation of the function explained in FIG. 3, 41b is the division notation of the function explained in FIG.
1c is the division notation in FIG. 5, 41d is in FIG. 6, and 41e is in FIG. 7. 41a means cropping in the sense of cropping a photo or a newspaper clipping, 41b means box in the sense of a simple box shape, 41c means image movement, which is the movement of the image itself, and 41d means the object to be erased is the periphery. From edge to edge, 41e is written as book because it is effective in the case of copying a book. Note that 41f is a notation for selecting and specifying, for example, whether to keep or delete the image in the area designated by cropping, and 41g is a notation for ending a series of operations.

Effects of the Invention As described above, according to the present invention, in addition to the original irradiation means in a conventional electrophotographic apparatus, a photoreceptor irradiation means and a detection means for detecting a specified position on the surface of the original are provided. Since it is equipped with a function specifying means for specifying various control functions performed by these, it is possible to move a desired area on the document surface in the exposure scanning system movement direction and in a direction different from the exposure scanning system movement direction. It can give editing functions and also
By separately displaying control functions in the function specifying means, it is possible to easily select and specify various types of processing to be applied to the copied image.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of main parts of a conventional electrophotographic apparatus, FIG. 2 is a perspective view of main parts of an electrophotographic apparatus according to an embodiment of the present invention, and FIGS. 3 to 7 are each an embodiment of the present invention. FIG. 8 is a plan view showing area designation on the document surface of the electrophotographic apparatus in the example, and FIG. 8 is a diagram showing an example of division notation. 10... Photoreceptor, 14... Charger, 16... Original, 20... Fluorescent lamp, 24... Developer, 26...
Original table, 32...Light emitting diode, 34...Control circuit, 36...Position detection plate, 38...Instruction pen,
41...Function specification area, 41a, 41b, 41c
...Divided area, 44... Document platen drive motor, 45
...Copy paper feed motor.

Claims (1)

[Scope of Claims] 1. A document table drive means for driving a document table; a document irradiation means for irradiating light onto the document surface on the document table to obtain a reflected image; an imaging optical system for forming an image on the surface of the photoreceptor, and a light source that is installed parallel to the width direction of the photoreceptor and divided into a plurality of parts in a direction perpendicular to the width direction of the photoreceptor in order to irradiate the surface of the photoreceptor with light. a photoconductor irradiation means, a copy paper feeding means for sending copy paper, a position indicating means for indicating the position on the document placement surface, and a position instruction means on the document surface placed on the document placement surface. a position detecting means for detecting the position indicated by the position detecting means; a function specifying means for selectively instructing the control functions of trimming, box, image movement, edge, and book for the image; The operation of the photoreceptor irradiation means is controlled in order to perform the function designated by the function designation means in accordance with the detected position signal on the document surface, and the operation of the document table driving means or the copy paper feeding means is controlled. a control means for controlling the operation, the control means controls the first exposure of the document surface image to the photoreceptor by the original irradiation means and the imaging optical system; A second exposure is performed on the photoreceptor so that the first exposure and the second exposure are overlapped, and the function specifying means includes trimming of the image to the area specified by the position specifying means. , box, image movement, edge, and book control functions are described. 2. The electrophotographic apparatus according to claim 1, wherein the area is a rectangular area whose vertices are a plurality of points indicated by the position indicating means. 3. The area designated by the position indication means 2.
2. The electrophotographic apparatus according to claim 1, wherein the electrophotographic apparatus is a rectangular area having points as opposing vertices. 4 The area designated by the position indicating means 2
2. The electrophotographic apparatus according to claim 1, wherein the distance between points and the control function is a function of moving the image by the distance. 5. The area according to claim 1, wherein the area is a width from the edge of the copy paper to the point indicated by the position indicating means, and the control function is a function of erasing an image of the width. Electrophotographic equipment. 6. The area designated by the position indicating means 2
2. The electrophotographic apparatus according to claim 1, wherein the width between the points and the control function are erasing of an image corresponding to the width in a direction perpendicular to the copy paper feeding direction.