JPH0240665A - Halftone marking copying method and its device - Google Patents

Abstract

PURPOSE:To clearly read a parts such as heads by marking on the specified area on a transfer paper with halftone. CONSTITUTION:Irradiating light from a home-positioned exposing lamp 2 is reflected at the color band part of a correspondent gray original 4 corresponding to the stop position where the lamp is selected. At this time, light amount is adjusted corresponding to the selected color band. After this light is reflected by mirrors m1-m3, it passes through a lens L, is reflected by m4, irradiates a photosensitive body 5a on the surface of a photosensitive drum 5, and image- forms. Consequently, by selecting which color band of the gray original 4 opposed to the lamp 2 is to be corresponded and to stop, the amount of irradiating light to the photosensitive body 5a is determined corresponding to the halftone.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a halftone marking copying method and apparatus for marking a designated area on transfer paper using halftone.

[Prior art]

Conventionally, as a device capable of applying monochrome toner (marking) to a designated area of transfer paper as if it were painted with a marker pen, for example, Japanese Patent Laid-Open No. 62
An image editing copying machine described in Japanese Patent No. 103673 is known. This image editing copying machine first makes a solid copy in a predetermined color on part or all of the transfer paper, as disclosed in the same publication as an undercolor copy.
By making a copy of the original in a different color over the solid copy a second time, the solid copy can be made in red, yellow, etc. to areas of the original that are to be emphasized, such as advertisements or document headings.

[Problem to be solved by the invention]

However, with the above-mentioned undercolor copy, only a solid copy can be made as a copy of the background color, so for example, if a copy of another original is printed over a dark background color, or conversely, if the original has already been copied. When a solid copy of the background color is applied on top of the background color, there is an inconvenience that the headline text is hidden behind the background color and becomes invisible. In particular, if you want to add a copy of the background color later, or if you want to change the background color to black,
There was a fatal problem that the heading text etc. could not be seen at all.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a halftone marking copying method and an apparatus therefor that can make the background color part halftone and clearly read and reproduce parts such as headings.

[Means to solve the problem]

In order to achieve the above object, the halftone marking copying method according to the present invention performs halftone marking on designated areas of transfer paper, and does not apply any toner to areas other than the designated areas. and a composite copying step in which another copying process is performed on the same side of the transfer paper as the halftone marking is performed as a pre-process or post-process of the marking copying process. This is a tone marking copying method.

Moreover, as the apparatus used to carry out the method, various apparatuses described in the second and subsequent claims are employed. These methods mainly differ in the means for obtaining halftones, such as (1) using a gray original, (2) adjusting the light amount of an n-light lamp, and (3) adjusting the charge removal rate using a charge removal lamp (41). (31) A lamp for adjusting the light amount is added to the static elimination lamp pond (5) A type for adjusting the surface potential of the photoreceptor given by the main charger (6) A type for adjusting the developing bias (7) A type for adjusting the transfer efficiency Examples include things to adjust.

[Effect]

For example, when performing halftone marking copying using a gray original, when the copying process is started, the exposure lamp is moved to a position where it irradiates the low reflectance member, and then stopped there. The light irradiated from the RI light lamp is reflected by the low reflectance member, the illumination intensity is reduced by an appropriate amount, and the light is irradiated onto the photoreceptor after passing through a predetermined optical system. On the photoreceptor, static electricity is removed using a static electricity removal lamp except for areas where halftone marking is performed (hereinafter referred to as marking areas). Therefore, toner does not adhere to areas other than the marking area.

Further, as the photoreceptor rotates, the marking area is irradiated with light whose intensity is reduced through the low reflectance member,
When this passes through the developing section, toner is applied in the form of a halftone marking with an appropriate density.

Therefore, as the photoreceptor rotates, toner is transferred onto the transfer paper only in areas where halftone markings are designated. During the above process, the exposure lamp is stopped at a fixed position corresponding to the low reflectance member.

〔Example〕

Next, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

In addition, the following example is only an example of embodying the present invention,
It is not intended to limit the technical scope of the present invention.

(11. Example using a gray original) First, an example using a so-called gray original with intermediate brightness to obtain a halftone will be described.

Here, FIG. 1 is a schematic side sectional view of the copying apparatus according to this embodiment, and FIG. 2 (a+ is a perspective view showing a gray original that can be used in the copying apparatus shown in FIG. 1. FIG. 2 is a perspective view showing the mode of another gray original; FIG. 3 is a perspective view showing another gray original; FIG. 3 is a block diagram of the control device in the copying machine; A flowchart showing the control procedure of the copying apparatus, and FIGS. 5 to 7 are side sectional views showing specific examples of the copying apparatus to which the present invention can be applied.

FIG. 1 shows only an outline of the copying apparatus, and FIG. 5 shows its details. In FIG. 1, reference numeral 1 denotes a document table made of contact glass or the like. Below the document table 1 are arrows X and Y.
An exposure lamp 2 is provided which moves back and forth in the direction.

It should be noted that the present invention can of course also be applied to a type of copying machine in which the exposure lamp is stopped and the document table is moved.

This exposure lamp 2 starts moving in the direction shown by the arrow X from the home position shown by the solid line in the figure, moves parallel to the original, then changes its direction of movement to the direction of the arrow y at the edge of the original, and then moves to the original table 1. When it reaches the left end in the figure, it moves in the direction of arrow X again. In this way, by repeating the reciprocating movement in the directions of the arrows X and y for the number of copies to be processed, the copy process for the set number of copies is performed.

A gray document mounting plate 3 is located on the extension of the document table 1 and corresponds to the home position of the exposure lamp 2.
is provided. A gray original 4 as shown in FIG. 2+a+ is pasted on the surface of the gray original mounting plate 3 on the exposure lamp 2 side.

As shown in FIG. 2 (t6), the gray original 4 in this embodiment is divided into five color bands c. , C2°...C5. ,C.

..., C6 are divided into five stages from the solid black color band C8 in the figure to the solid white color band C6 at the left end of the figure, and the intermediate color bands c, , c3 . c and are composed of monochrome-like gray originals whose reflectance increases in order.

In Fig. 1, exposure lamp 2 in the home position
According to the selected stop position of the exposure lamp 2, the light irradiated from
It is reflected by the colored band. At this time, the amount of light reflected from the selected color band is adjusted according to the selected color band.

The light amount adjusted in this way is mirror ml, ff12m
, passes through the lens L, is further reflected by m4, and is irradiated onto the photoreceptor 51 on the surface of the photosensitive drum 5, forming an image. Therefore, which color band c. of the gray original 4 facing the exposure lamp 2. ,c. , . . . By selecting whether to stop corresponding to C5, the amount of light irradiated onto the photoreceptor 51 can be selected according to an arbitrary halftone.

On the other hand, in FIG. 1, the photosensitive drum 5 is surrounded by a main charger 6, a static elimination lamp 7, a developing device 8. A transfer charger 91 and a separation charger 10 are provided in this order.

Therefore, the transfer paper supplied from a paper supply section such as the paper supply cassette 11 passes through the registration roller pair 12 and the transfer section between the transfer charger 9 and the photoreceptor 58, and is exposed to the photosensitive material by the transfer charger 9. The toner on the body 51 is transferred,
Further, the image is sent to a fixing device 14 by a conveyor belt 13. A branching device 15 is provided on the downstream side of the fixing device 14, and the transfer paper output from the fixing device t4 is directly discharged toward the paper discharge tray 16, or is U-turned toward the intermediate tray 17. The copy paper temporarily stocked in the intermediate tray 17 is transferred again to the registration roller pair 12 by the feed roller 18.
By passing through the transfer section again, the toner image on the photoreceptor 58 is transferred to the conveyor belt 13. The paper is ejected to the paper ejection tray 16 via the fixing device 14.

The copying machine shown in FIGS. 1 and 5 above can perform double-sided copy processing and composite copy processing in addition to normal copy processing, and can also perform halftone marking copy processing according to the present invention. be.

In the above-described halftone marking copying process, the processing mode, marking area, halftone density, etc. are specified using the operation unit 19 shown in FIG.

The operation section 19 has a marking destination processing designation key 20 and a marking post-processing designation key 21 at the left end in the figure. The marking destination processing 1 determination key 20 is the intermediate tray 1.
This key is used to select a processing mode in which marking processing is performed in the first stage of composite copy processing using 7, and copying processing is performed in a subsequent stage overlapping the markings. Further, the marking post-processing designation key 21 is a key for selecting a copy mode in which marking copy processing is performed on transfer paper that has already been copied from an appropriate original, and in this case, the intermediate tray 17 is The transfer paper that is not used and comes out of the paper feeder 11 is conveyed in a straight line and is discharged to the ii+-ray 16, where it undergoes only one copying process.

A halftone setting section 22 in the marking area is provided to the right of the marking destination processing designation key 20 and the marking post-processing designation key 21. This halftone setting section 22 is connected to an automatic halftone mode key 23.
, a density decrease setting key 24 for decreasing and specifying the density of this halftone, and a density increase setting key 241 for increasing and setting the density. When the automatic halftone mode key 23 is pressed, a predetermined intermediate level halftone is set and the LED 25a lights up. Also, the density reduction setting key 24. When you press , the lighting positions of the LED 26 representing the five concentration levels move sequentially to the left, and finally the LED 251. lights up. Also, if you press the concentration increase setting key 24I,
The lighting position of the ED 26 sequentially moves to the right, and finally, L ED 25 e indicating that the marking is solid black (solid red, solid yellow, etc. depending on the designated color) is lit.

A color change key 27 is provided on the right side of the halftone setting section 22 in the figure, and when pressed, color LEDs 28m, 28b, 2 indicating toner colors that can be selected sequentially are provided.
Either 8c or 28a lights up. That is, when the copying machine main body is equipped with two developing devices 8a and 8I as shown in FIG. The color toner LED lights up. If you want to add a color mark of any color, use the developing device 8. Replace the developing device with one filled with toner of that color.

In the copying machine shown in FIGS. 5 and 6, the developing device is 8. and 8i can be installed, so install the developing device filled with black toner on the main 81,
Generally, the other auxiliary developing device 8b is replaced with a developing device loaded with any color toner.

In addition, in a type of copying machine equipped with only one developing device 8 as shown in FIG. 7, this developing device! By replacing 8 with a developing device loaded with any color toner, any color marking can be applied.

In this case, the color toner LED 28. ~28a lights up.

Further, on the right side of the color change key 27 in the figure, an edit designation section 29 is provided.

This edit specification section 29 has a trimming specification key 308 and a masking specification key 30 for specifying the editing mode depending on whether it is trimming or masking.
5. Marker key 30 for specifying whether or not to perform marker processing on the trimmed or masked area.
．． In addition, input keys such as an edit manual key 31a and an edit end key 311 are provided. Such an edit designation section 29 is configured by the above-mentioned trimming designation key 301 or masking designation key 301. By pressing , the user specifies whether to perform masking or trimming in the area to be specified, and by pressing the marker key 30c, specifies whether to perform marking processing on that area. After that, when the input key 31 is pressed, the edit designation number LED 3 indicates that the first edit designation field is in the designation state.
2° lights up. In this state, by operating the numeric keypad 33, the coordinates of the four sides of the rectangular editing area are sequentially input. The position of each side to be input is confirmed by the operator by lighting the side display LED 34. 1. The coordinate values input using the numeric keypad 33 are displayed on the coordinate display LED 35.

When there are a plurality of edit designated locations, when inputting the coordinates of the four sides described above for one designated location is completed, the next edit designated number LED 32b lights up, and the coordinates for the next edited designated location are input. In this embodiment, three edit designation number LEDs 32. ．． 32b,
32c, and three edit processing positions can be specified. After specifying the edit processing position of the necessary part, press the edit end key 31b and press CP to end.
Communicate to U.

In addition, 36 is the density setting key in normal copy processing,
37 is a print button; 39 is a display section for displaying the set number of copies and other comments; and the operation section 19, configured as described above, is a CPU input section that controls the main body of the copying machine as shown in the figure. It is connected to the. Further, the output section of the CPU is connected to a driver circuit, exposure lamp 2, mirror ml, m2, etc. via D2. An optical system driving motor M for driving the optical system of m3 and a main motor M2 for driving the transport system and others are connected. Further C
The static elimination lamp 7 is connected to the PU via a controller 38.

Next, with reference to the flowchart shown in FIG. 4, the control procedure of this embodiment apparatus will be explained.

In addition, in the following explanation, Sl, S2. ... indicates the number of the processing procedure (step).

First, when program processing starts, it is determined at Sl whether the marker key 30c has been pressed. If the marker key 30c is not pressed, marking processing will not be performed, so it is determined in S2 whether or not to perform editing copying. This judgment is made using the trimming designation key 30. Alternatively, this is done by checking whether the masking designation key 30 has been pressed, and if none of these has been pressed, normal copying processing (S3) is performed. In this case, the branching device 15 shown in FIG. 1 is switched to send out the transfer paper sent out from the fixing device 14 in the direction of the paper output tray 16, and the transfer paper sent out from the paper feed cassette 11 is transferred to the registration rollers. 12. The transfer section between the transfer charger 9 and the photosensitive drum 5, lil! Feed belt 13. The paper is discharged to the paper output tray 16 via the fixing device 141 and the branching device 15 (34)
.

In step S1, if it is determined that the marker key 30e is pressed, that is, marking copying processing is to be performed, in step S5, the marking post-processing designation key 2 is pressed.
It is determined whether or not 1 has been pressed. As mentioned above, the marking post-processing designation key 21 is a key for specifying the mode in which marking processing is to be performed on top of transfer paper on which the copying process for a suitable original has already been completed. The color edit mode routine CB shown in FIG. 4('b) is executed.

In this subroutine, it is first determined in 311 whether the editor key 31□ has been pressed;
If pressed, the operator can press the numeric keypad 33.
A comment is made to specify the area using
S12) When the area designation is completed, it is determined in step 313 whether or not this copying machine is capable of color changing. As mentioned above, in the case of a copying machine having two developing devices am and aI shown in FIGS. 5 and 6,
An auxiliary developing device 8 is often designated for color change, and even when only a single developing device is used as shown in Figure 7, it is attached to the color toner developing device. In some cases, it is possible to change the color by redoing it. If the color can be changed, the operator operates the color change key 27 to check whether or not the developing device containing toner of the specified color is installed in the machine, or whether the developing device containing toner of the specified color is installed. It is determined whether or not it has been replaced in a state where development processing is possible (S14). In this manner, when a color change is necessary, the color is changed automatically or manually by the operator so that the developing device containing the specified color toner can perform the developing process (S15).
.

When the color edit mode routine is thus completed, the halftone mode routine HM shown in FIG. 4 (tel) is subsequently executed. In this halftone mode routine, it is first determined whether the automatic halftone mode key 23 has been pressed (521), and if it has been pressed, the color band c. −
c. The exposure lamp 2 is moved to a position where it will expose either one of the two.

In this example c. %C5 can be specified, so for example, the exposure lamp 2 can be moved to the middle color band C3 position and stopped at this position (S22), and if the automatic halftone key 23 is pressed. If not, the exposure lamp is moved to the position of the color band specified by the density decrease setting key 24° or the density increase setting key 24 and stopped.

After the halftone mote routine is processed as described above, the marker copy routine MC is then executed. As shown in FIG. 4 +d+, the marker copy routine MC turns on or off the static elimination lamp corresponding to the marking area specified by the color edit mode routine CB, and moves the optical system to the position specified by the halftone mode routine HM. Copy processing is performed with a constant amount of light while the device is stopped (S31). When the marker copy routine MC is completed in this way, it is determined whether the marker copy process has been completed for all the designated edit positions (S6). If there are multiple specified edit areas and marking copy processing has not yet been completed for all of them, the branching device 15 is switched in S7 to stack the transfer paper on the intermediate tray 17, and the color edit mode routine is executed again. Each process of CE, halftone motor routine HM, and marker copy routine MC is executed, and when the marking copy process is completed for all specified in S6, the branching device 15 is switched and the transfer paper is discharged to the paper discharge tray l6 (S8 ).

As described above, the marking process using a predetermined halftone is completed by overlapping the already copied material.

If it is determined in step S5 that the marking post-processing designation key 21 has not been pressed, then in 541 it is determined whether or not the marking destination processing designation key 20 has been pressed. As mentioned above, the marking destination process specification key 20 specifies the process of first performing marking process on the transfer paper and then copying another document on top of it, and when this key is pressed, Color edit motto routine CE, halftone motto routine H
M. A marker copy routine MC is executed to perform marking processing at a specified halftone density on a specified position on the transfer paper, and this is stacked on the intermediate tray 17 (342).

If there are multiple edit positions specified for marking, it is determined in step 343 whether marking processing has been completed for all of them, and if there is an unprocessed edit position, the color edit motor routine CM is executed. , halftone seventh routine HM, and marker copy routine MC are executed in sequence.

In addition, when the copy processing for all edit specified positions is completed, copy processing of another original is performed on the transfer paper stacked on the intermediate tray 17 (normal copy processing is executed (OC)). , such a normal copy routine is shown in FIG. 4 (111), and changes the color as necessary (351, 352, 353).
, after performing a series of copy operations excluding ejection (S54),
The branching device 15 is switched to discharge the transfer paper to the paper discharge tray 16 (344).

In Sl, if the marker key is pressed but neither the marking post-processing designation key 21 nor the marking destination processing designation key 20 is pressed, the normal copying process is performed first and then the marking copy is performed. It is understood that processing is scheduled to be performed, so after performing the normal copy routine OC, in S61, the branching device 15 is moved to the intermediate tray 1.
7 side, and the transfer paper on which normal copying has been completed is stacked on the intermediate tray 17. After that, the transfer paper stacked on the intermediate tray 17 is sent out, passes through a color edit mode routine CB, a halftone mode routine HM, and a marker copy routine MC, and undergoes marking copy processing. In this case, the determination in S62 as to whether or not the marker is finished is negative, and in S63, the transfer paper is stacked on the intermediate tray 17 by switching the branching device 15, and the transfer paper is again subjected to the color edit mode routine CE, half Tone morte routine HM, marker copy routine M
Processing according to C is performed to continue marker processing for the designated marking position. Furthermore, if it is determined in S62 that the marker processing has ended,
The branching device 15 is switched to discharge the transfer paper to the paper discharge tray 16 (S64).

In the embodiment described above, the gray original 4, which is an example of a low reflectance member configured to have a plurality of color bands having different reflectances divided in the exposure scanning direction, is fixed near the home positive silane. . Therefore, in order to obtain the desired halftone mode, the color band 01 corresponding to the desired halftone density is selected.
The exposure lamp 2 is moved to a position of ~C5. On the other hand, the gray original may be moved in the exposure scanning direction with respect to the exposure lamp 2 stopped at the home position until a color band of a desired density comes to a corresponding position.

Fig. 2(b) shows an example of such a case, in which a gray original 4' is formed into an endless band and is passed between two pulleys 40□ and 40T. 401 is rotated by a gray original drive motor M3, and adjusted so that a color band of a desired halftone density is placed at the irradiation position of the exposure lamp 2, which is stopped at the home position. In this case, as shown in FIG. 3, the gray document driving motor M3 is rotationally driven by the CPU via a driver circuit.

Furthermore, a gray original does not necessarily have to be composed of a color band with a considerable width in the exposure scanning direction as shown in FIG. , the halftone density of the marking area can be determined by the color shading of this straight line. Further, the color bands 01 to C may have brightness that changes continuously in the exposure scanning direction, and a halftone can be obtained with only one step of Ct instead of multiple steps.

Furthermore, a gray original does not necessarily have to be composed of a color band having a uniform density in the longitudinal direction of the exposure lamp 2. For example, as shown in FIG. It can also be configured by striped pattern portions 41 having different reflectances formed at intervals.The pattern of the marking area obtained by such striped pattern portions 41 is as follows.
As shown in 41' in Fig. 2 (c), it looks like a pattern printed with many thin lines as a background pattern. Also, when such a striped pattern part 41 is imaged by the lens L, it is placed on the surface of the photoreceptor 5°. Therefore, on the surface of the photoreceptor 51,
If a somewhat blurred image is obtained, the marking image corresponding to the striped pattern portion 41 can be made to have an almost monochromatic halftone. The striped pattern portion 41 may be a broken line.

In each of the above embodiments, the gray original is placed near the home position of the exposure lamp 2, but such a gray original is placed in an area away from the reciprocating range of the exposure lamp 2 during normal copy processing. It can be provided at any location within the movable range of the exposure lamp 2.

For example, it may be provided at the right end of the document table 1 in FIG.

(2) Example of Adjusting the Light Amount of the N-Light Lamp In order to obtain a desired halftone density, the light amount of the exposure lamp 2 for performing halftone copy processing may be adjusted.

That is, instead of the driver circuit D3 shown in FIG. 3 and the gray document drive motor M3 connected thereto, as shown in FIG. 8, the exposure lamp 2 is connected to the output section of the CPU via the voltage adjustment circuit AVR. do.

In this case, if the automatic halftone key 23 is pressed in the halftone seventh routine of FIG. 4(c) (S21)
In this step, the output from the voltage adjustment circuit AVR is adjusted to a voltage that provides a predetermined halftone (322).

Further, in S21, if it is determined that the automatic halftone key 23 is not pressed, the density decrease key 24□
Or density increase key 241. The output of the voltage adjustment circuit AVR is adjusted so that the halftone mode specified by is obtained, and the brightness of the exposure lamp 2 is adjusted in accordance with the desired halftone mode.

In this case, the exposure lamp 2 is at the home position,
In addition, it is stopped at a position away from the normal exposure scanning range, and a white or appropriate monochrome-like color band is pasted at that position (.

Further, as a method for adjusting the amount of light from the exposure lamp 2 as described above, as shown in FIG. A slit plate 4 having a slit 42 in the optical path up to
3 may be provided, and the amount of light irradiated onto the photoreceptor 51 may be reduced by the slit 42.

In this case, the slit plate 23 has a plurality of slits 421° 42h with different slit widths as shown in
, 42c, and as shown in the same figure (bl), CP
The slit plate 43 is moved in the direction of the arrow 44 by the slit driving motor M connected to the output part of the U via the motor driver circuit, and a slit of a width that can obtain the desired halftone density is placed in the optical path. It may be moved to a position where they intersect.

The slit width can also be changed by configuring the slit between two parallel plates and changing the interval between the two plates.

Further, as shown in FIG. 10, from the exposure lamp 2 to the photoreceptor 5. A filter 45 may be interposed in the optical path between the two, thereby limiting the amount of light reaching the photoreceptor 58 to obtain a halftone of a desired density. In this case,
゛As shown in Fig. 10 (bl), the filter 45 is divided into multiple stages, and a plurality of filters 45u with different i!
45I, -45c, and 45J, which are moved in a direction perpendicular to the optical path by a filter drive motor M, and a desired halftone density is obtained by intersecting the optical path with a filter of an arbitrary transmittance. It is also possible to do so.

(3) Example of adjusting the static elimination rate using a static eliminating lamp As is already well known, the static eliminating lamp 7 shown in FIG. In all of these embodiments, the LEDs constituting the static elimination lamp were placed within the designated marking area.
A predetermined marking area is obtained by turning off the EDs all at once for a specified time and turning on all LEDs in other areas and times, but the marking area of the static elimination lamp 7 as described above Instead of completely turning off the LED in the area corresponding to the marking area, the illuminance is reduced to the brightness that produces the halftone and the LED is turned on, thereby creating a charge that deposits toner with the desired halftone density on the photoreceptor corresponding to the marking area. can be formed. In this case, the exposure lamp 2 is continuously turned off during the marking process. Therefore, there is no need to stop the exposure lamp.

The process of lighting a part of the LEDs constituting the static elimination lamp 7 at low illuminance as described above is carried out by the third
This is possible by appropriately driving the controller shown in the figure.

Further, as a method for substantially reducing the illuminance of the LEDs constituting the static elimination lamp 7, the voltage given to each LED is reduced, the output to each LED is changed in a pulse manner, and the above-mentioned pulse signal is turned on. A desired halftone density can be obtained by appropriately adjusting the time ratio between the time of the light and the time of turning off the light.

(4) Embodiment in which a light adjustment lamp is provided separately In this embodiment, instead of the gray original 4 shown in FIG. 1, as shown by the broken line in FIG. An adjustment lamp 46 is provided in a section from the main charger 6 to the developing device 8. This light amount adjustment lamp 46 has the same structure as the static elimination lamp 7, and by adjusting the output to all LEDs so as to obtain the desired illuminance, the static elimination lamp 7 does not emit light. The surface of the photosensitive drum 5 in the marking area is irradiated with light of intermediate illuminance corresponding to the desired halftone density. Such a reduction in the amount of light can be achieved by periodically blinking the light amount adjustment lamp 46 and adjusting the blinking rate, as in the embodiment for adjusting the charge removal rate. can.

In this case, as in the above embodiment in which the charge removal rate is adjusted, the exposure lamp is continuously turned off during halftone copying, so there is no need to stop the exposure lamp.

(5) Example of adjusting the voltage applied to the main charger In this case, the exposure lamp is turned off during halftone copy processing. Therefore, whether or not the exposure lamp moves during that period has no effect on the marking process. The amount of transferred toner is reduced to obtain the desired halftone density.Therefore, the halftone density is adjusted by adjusting the voltage applied to the main charger.In this case, marking Portions outside the area are irradiated with light from the charge eliminating lamp 7 to erase the charge, thereby preventing toner from transferring to those portions.

(6) Example of adjusting the developing bias The amount of toner transferred to the photoreceptor is influenced by the potential difference between the developing roller and the surface of the photoreceptor drum 5, even if the amount of charge on the surface of the photoreceptor 51 is constant. Therefore, in a typical copying machine, a constant bias voltage is applied to the developing roller to adjust the transfer of toner from the developing roller side to the surface of the photoreceptor 5°. Therefore, when the bias voltage on the developing roller is increased, the transfer of toner from the developing roller to the photoreceptor 51 is prevented, and the transfer of toner from the developing roller to the photoreceptor 51 is prevented. Even if the same amount of charge is applied to the toner, the toner density continues to decrease.

In this embodiment, the amount of toner transferred in the marking area is adjusted by adjusting the bias voltage to the developing roller during halftone copy processing and applying a slightly higher bias voltage than in the standard state, taking advantage of the above phenomenon. and perform halftone marking copy.

(7) Example by changing transfer efficiency In this example, a halftone copy with a desired density is obtained by appropriately lowering the voltage applied to the transfer charger 9. In this case as well, the exposure lamp 2 is turned off during the halftone copying process, so there is no problem with its position moving.Also, for areas other than the halftone marking area, the static elimination lamp 7 is blinked and exposed. Body 5. Eliminates the charge on the surface and prevents toner from transferring.

(8) Others In the above embodiments, marking is performed on a designated area, so it is naturally possible to designate the entire surface of the transfer paper. In that case, the area to be marked may be automatically designated by a signal from the document size detection means.

Further, as a means for adjusting the amount of charge formed on the surface of the photoreceptor, it is also possible to change the circumferential speed of the photoreceptor drum.

〔Effect of the invention〕

Since the present invention is configured as described above, it is possible to apply a low-density toner by halftone to a desired marking area that has been edited, so that it can be applied over a previously copied image. Even if marking copy processing is performed, the previously copied image will not be difficult to see, and even if another original image is copied over the same color base, the base will be halftone-processed. This eliminates the inconvenience that images added later become difficult to see.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view of a halftone copying apparatus according to an embodiment of the present invention that uses a gray original; FIG.
(bl, (c) are respectively a perspective view showing the form of a gray original in the copying machine shown in FIG. 1, FIG. 3 is a block diagram showing the hardware configuration including the operation section used in the same embodiment, and FIG. al, (bl, fcl, fdl, t
el is a flowchart showing the processing procedure of the embodiment apparatus shown in 1st FyJ, and FIGS. 5, 6, and 7 are side sectional views showing details of a copying machine that can be used in the same embodiment, respectively. Fig. 8 is a schematic circuit diagram showing the circuit configuration of an embodiment in which the voltage applied to the exposure lamp is adjusted among the embodiments in which the amount of light is adjusted.
A side view of the fusuma-style side view showing the embodiment according to the i-separation;
The same figure (c. is a perspective view showing the driving mechanism of the slit 7, and FIG. 10 is an example of adjusting the light amount using a filter. ('b)
FIG. 2 is a perspective view showing a filter driving device. [Explanation of symbols] 1... Original table 2... Exposure lamp 4... Gray original c,, C2,... Color band 5... Photosensitive drum 5,... Photosensitive drum 6 ... Main charging 7 ... Static elimination lamp 8 ... Developing device 9 ... Transfer charger 5 ... Branching device 7 ... Intermediate tray 9 ... Operation section O ... Marking destination processing specification Keyed...Marking post-processing designation key 2...Halftone setting section 3...Auto halftone key 4...Density decrease setting key 4b...Density increase setting key 7...Color change key 9... ...Edit designation section 30c...Marker key 31□...Edit input key Ml...Optical system drive motor M2...Main motor M,...Gray original drive motor M4...Slit Drive motor M, filter drive motor 41, striped pattern portion AVR, voltage adjustment circuit 42, slit 45, filter.

Claims (17)

[Claims] (1) A marking copying process in which the designated area of the transfer paper is marked with halftone and no toner is applied to areas other than the designated area, and a process before or after the marking copying process. A halftone marking copying method comprising: a composite copying step of performing another copying process on the same side of the transfer paper as the side on which the halftone marking is performed. (2) a. Area specifying means for specifying an area to be marked by halftone; b. a static elimination lamp that removes the electric charge on the photoreceptor from areas other than the area specified by the area specifying means where halftone marking is performed; c. A low reflectance member that is provided in parallel with the exposure lamp within the range that can be irradiated by the exposure lamp and reflects the light from the exposure lamp while reducing the amount of light; d. 1. A halftone marking copying apparatus comprising an exposure scanning stop means for keeping the relative position of the exposure lamp and the low reflectance member constant during halftone marking copying processing. (3) The low reflectance member is configured to have a plurality of color bands having different reflectances in the exposure scanning direction, and the relative position of the exposure lamp and the low reflectance member during the copying process is controlled by the plurality of color bands. Claim (2) wherein the halftone density is selectively changed by selectively changing the density corresponding to the position of the
2.) The halftone marking copying device described in ). (4) The halftone marking copying apparatus according to claim (2), wherein the low reflectance member is constituted by striped patterns having different reflectances divided in the longitudinal direction of the exposure lamp. (5) a. Area specifying means for specifying an area to be marked by halftone; b. a static elimination lamp that removes the electric charge on the photoreceptor from areas other than the area specified by the area specifying means where halftone marking is performed; c. a reflective member provided in parallel with the exposure lamp within the range that can be irradiated by the exposure lamp; d. exposure scanning stop means for keeping the relative position of the exposure lamp and the reflecting member constant during the halftone marking copying process; e. A halftone marking copying apparatus comprising: a light amount adjusting means for adjusting the amount of light exposed to a photoreceptor during halftone marking copying processing. (6) The halftone marking copying apparatus according to claim (5), wherein the light amount adjusting means comprises means for adjusting the illuminance of an exposure lamp. (7) The halftone marking copying apparatus according to claim (5), wherein the light amount adjusting means is constituted by a slit provided on the optical path from the exposure lamp to the photoreceptor. (8) The halftone marking copying apparatus according to claim (5), wherein the light amount adjusting means is constituted by a filter provided on the optical path from the exposure lamp to the photoreceptor. (9) a. Area specifying means for specifying an area to be marked by halftone; b. a static elimination lamp that is driven to remove the charge on the photoreceptor in areas other than the area designated by the area designation means to be marked by halftone, and to reduce the static elimination rate in the designated area; c. A halftone marking copying apparatus comprising: an exposure lamp extinguisher for turning off an exposure lamp during halftone marking copying processing. (10) The halftone marking copying apparatus according to claim (9), wherein the reduction in the charge removal rate by the charge removal lamps is performed by adjusting the light amount of each charge removal lamp. (11) The halftone marking copying apparatus according to claim (9), wherein the reduction in the static elimination rate by the static elimination lamps is performed by periodically blinking each static elimination lamp. (12) a. Area specifying means for specifying an area to be marked by halftone; b. a first static elimination lamp that removes charges on the photoreceptor from areas other than the area designated by the area designation means to be marked by halftone; c. a second static elimination lamp provided between the main charger and the developing section and driven to remove charges on the photoreceptor at a lower static elimination rate than the first static elimination lamp; d. A halftone marking copying apparatus comprising: exposure lamp extinguishing means for turning off an exposure lamp during halftone marking copying processing. (13) The halftone edit copying apparatus according to claim 12, wherein the reduction in the static elimination rate by the static elimination lamps is performed by adjusting the light intensity of each static elimination lamp. (14) The halftone marking copying apparatus according to claim 12, wherein the reduction in the static elimination rate by the static elimination lamps is performed by periodically blinking each static elimination lamp. (15) a. Area specifying means for specifying an area to be marked by halftone; b. charger voltage adjusting means for lowering the voltage applied to the main charger during halftone marking copying processing than during normal copying processing; c. a static elimination lamp that removes the charge on the photoreceptor from areas other than the area designated by the area designation means for halftone marking; d. A halftone marking copying apparatus comprising: an exposure lamp extinguisher for turning off an exposure lamp during halftone marking copying processing. (16) a. Area specifying means for specifying an area to be marked by halftone; b. a static elimination lamp that removes the electric charge on the photoreceptor from areas other than the area specified by the area specifying means where halftone marking is performed; c. A developing bias adjusting means for adjusting the bias voltage applied to the developing device during halftone marking copying processing to be higher than that during normal copying processing; d. A halftone marking copying apparatus comprising: an exposure lamp extinguisher for turning off an exposure lamp during halftone marking copying processing. (17) a. Area specifying means for specifying an area to be marked by halftone; b. a static elimination lamp that removes the electric charge on the photoreceptor from areas other than the area specified by the area specifying means where halftone marking is performed; c. Transfer efficiency adjusting means for adjusting the voltage applied to the transfer charger during halftone marking copying processing to be lower than that during normal copying processing; d. A halftone marking copying apparatus comprising: an exposure lamp extinguisher for turning off an exposure lamp during halftone marking copying processing.