JPS6346068A - Multicolor image forming device - Google Patents

Abstract

PURPOSE:To process a four-color separation signal by a three-color developing printer, by synthesizing a black color separation signal and other color separation signals, respectively, and reproducing successively an image, based on an obtained recording color signal of three colors. CONSTITUTION:After having depressed a power source switch, a three-color developing output selective switch and display lamp 4a is depressed, and it is repeated to place each color separated original 6d, 6a, 6b and 6c of Bk (black), Y (yellow), M (magenta), and C (cyan) on an original platen glass 2a, and to remove it from the original platen glass 2a, in accordance with turn-on and turn-off of a separated color read instruction lamp 5 successively, it is confirmed that read of all color separated originals has been ended, and thereafter, when a print switch 4b is depressed, a laser beam from a laser scanning system exposes a photosensitive drum which has been electrified uniformly by a corona discharge device. In this way, a four-color separation signal can be inputted to a recording part having a three-color developing part.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of forming a full-color image by manually applying color separation signals of four colors including BK (black) to a recording section having a developing section of three colors. The present invention relates to a multicolor image forming apparatus.

[Conventional technology]

Conventionally, as a color separation copying device using an electrophotographic method, which is one of this type of multicolor image forming device, there is a 3-color development/synthesis copying device that handles 3-color separation signals, and a 4-color development/synthesis copying device that handles 3-color separation signals, and a 4-color copying device that handles 3-color separation signals.
There are four-color development/synthesis copying devices that handle color separation signals.

Original documents with three-color separation signals or four-color separation signals (referred to as film originals) are placed one by one in a positioning bin fixed on the document table glass, and the document table cover is closed. Next, the document reader of the copying device reads the film document, creates a latent image on the drum photoreceptor, develops the latent image with a developer of the corresponding color, and transfers the document onto the transfer drum. Transfer the toner image to. The film original that has been scanned is removed from the platen glass, and the copying device performs the same operations and processing steps as described above, three times in the case of a three-color separation film, four times in the case of a four-color separation film, according to the color-specific reading instructions of the copying device. After repeating
The transfer paper is fixed by the fixing unit and then discharged to the paper discharge tray.

[Problem that the invention seeks to solve]

However, when four-color separation signals are used, there is a drawback that black cannot be accurately reproduced when recorded using a three-color developing printer. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a multicolor image forming apparatus in which a three-color developing printer can handle four-color separation signals.

[Means for solving problems]

In order to achieve such an object, the present invention provides a multicolor image forming apparatus that reproduces a color image based on four color separation signals including a black color separation signal. The present invention is characterized in that it includes a combining means for respectively combining the three color recording color signals to obtain three color recording color signals, and a reproduction means for sequentially reproducing images based on the three color recording color signals obtained by the combining means.

[Effect]

In the present invention, it is possible to manually input four-color separation signals to a recording section having a three-color developing section.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the basic configuration of an embodiment of the present invention.

In the figure, reference numeral a denotes an address correction means for correcting addresses of four color separation signals including a black color separation signal based on read data of alignment marks on the document.

Reference numeral b denotes a storage means for storing each color separation signal in accordance with the corrected address corrected by the address correction means a. Reference numeral C denotes a synthesizing means that synthesizes the black color separation signal read from the storage means and the other color separation signals to obtain three recorded color signals. d is a reproducing means for sequentially reproducing images based on the recorded color signal obtained by the combining means C;

FIG. 2 shows the external appearance of the apparatus according to the present invention. Here, 1 is a laser beam printer, which has three color developing sections of Y (yellow), M (magenta), and C (cyan). 2 is a document reading device (reader) that reads a color-separated image original of BK (black) in addition to the three colors Y, M, and C, and temporarily stores it in an internal storage device; 2a is the color-separated image original; This is the original table crow of the reader 2 on which the document is placed. 3 is a print switch disposed on the jetter 2, 4 is an output selection switch and display lamp, 4a is a 3-color development output selection switch and display lamp, and 4b is a 4-color development output selection switch and display lamp. By pressing a push button switch according to the specifications of the printer 1 that outputs a multicolor image, the corresponding lamp lights up and the desired function is switched.

6 is a color separation original, 6a is a Y (yellow) color separation original, 6b is a M (magenta) color separation original, 6C is a C (cyan) color separation original, and 6d is a BK (black) color separation original. This is a color original.

7 is a document table cover. 5 is a color separation reading instruction lamp, and 5a, 5b, 5c, and 5d are each (yellow).

These are M (magenta), C (cyan), and BX (black) color separation reading instruction lamps, which instruct the placement or removal of each color separation original 6 on the document table crow 2a by blinking the lamps.

FIG. 3 shows the main internal structure of the embodiment device shown in FIG.

Here, 8 is a document scanning optical system, 9 is an image sensor that converts an optical image into an electrical signal, 10 is a laser scanning system that is driven by a read signal from the image sensor 9, and 11 is a photosensitive tram that rotates in the direction of the arrow in this figure. It is.

The photosensitive tram 11 is composed of a conductive tram and a photoconductive layer, and is uniformly charged by a corona discharger 12 and then exposed to light by a laser scanning system 10. On the other hand, the developing device for developing the latent image formed on the photosensitive drum 11 is
The opening for development is fixed to a support 14 which rotates in the direction of the arrow in the figure around a rotating shaft 13 during development so that it is located on the same circumference as the support 14. This support body 14 is rotationally driven by a main motor M.

The toner image formed on the photosensitive drum 11 is transferred to a transfer drum 16 by a well-known transfer mechanism using a transfer corona discharger 15.
The image is transferred onto a transfer material, such as a recording sheet, which has been supported in advance, overlapping the previously transferred image of another color.

Note that 22 and 23 in this figure are upper and lower cassettes that store transfer materials, respectively, and the transfer materials in these cassettes are supplied to the transfer tram 16 via register rollers 21.

On the other hand, the transfer material that has completed the above-mentioned transfer process is separated from the transfer tram 16 by the separation claw 17, and then transferred to the conveyor belt 18.
is conveyed to the fixing device 19 and discharged onto the discharge tray 20.

FIG. 4 shows the configuration of the above-mentioned color separation original 6, and shows a BK (black) color separation original 146d as an example. Here, 6d-1 is an image section. 6d-2 each has a matching mark having a fixed relative positional relationship with the image portion 6d-1, and is drawn at four places on the left and right outside the image portion 6d-1. Reference numeral 6d-3 is a pin hole for positioning, and it is used when mechanically aligning the position, or it is not necessary in the present invention, so it is not used.The flowchart in FIG. This section describes the operating procedure when using a printer or three-color development printer. Next, the operation of the embodiment of the present invention will be explained with reference to the flowchart of FIG.

Operation 1 described on the left side of this figure is the operation procedure when a 3-color development printer is used as printer 1. In that case, after pressing the main switch (power switch) (step S1), 3-color development printer is used. Steps 52 and 53) of pressing the development output selection switch/display lamp 4a, the originals 6d and 6a are separated into B (black), Y (yellow), 9M (macenta), and C (cyan).

6b and 6c are sequentially turned on and off as the color separation reading instruction lamp 50 turns on and off (steps S4 and S6), and the process of placing them on the document glass crow 2a (step S5) and removing them from the document glass crow 2a is repeated (step S5, 57). , confirm that the reading of all color-separated originals has been completed (step S8), press the print switch 4b (step S9), and the image information read by the image sensor 10 is scanned by the laser of the printer 1 shown in FIG. The system 10 is sequentially powered, and a laser beam from the laser scanning system 10 exposes the photosensitive tram 11 uniformly charged by the corona discharger 12.

The latent image thus formed on the photosensitive drum 11 is sequentially developed by the Y developing device 14Y, the M developing device 14M, and the C developing device 111G, and the toner image formed on the photosensitive drum 11 is developed by the corona discharger 15. Transferred by tram 16
The images are sequentially transferred onto transfer materials supplied via register rollers 21 from upper and lower cassettes 22 or 23 supported above in advance.

After the transfer process has been completed, the transfer material is separated from the transfer tram 16 by the separation claw 17, and then transported to the fixing device 1 by the conveyance heald 18.
9 and is discharged onto a tray 20.

Note that operation 2 described on the right side of FIG.
Operating procedure when using a 4-color development printer (
Steps 510 to 517) will be shown, and detailed description thereof will be omitted since they are not directly related to the present invention.

FIG. 6 shows the main circuit configuration of the device according to the embodiment of the invention described above. The image signal read by the reader part 2 (see FIGS. 2 and 3) and converted into an electric signal is sent to Y, M, C, B via the signal line 31 and the preceding buffers 24a to 24d.
K image memories 25-a, 25-b, 25-
c, 25-d.

At this time, whether the image signal of the color or color is being sent to the signal line 31 is determined by the color separation reading instruction lamps 5a and 5b shown in FIG.
,5c,! In parallel with the display of +d, the CPLI (central processing unit) 29 also outputs the signal via the signal line 34, and the output signal is sent to the image memory management unit (MMIJ) 2.
7 buffers 24-a, 24-b, 24-c, 24
d is coated into an oven signal for oven and outputted to each of the buffers 24-a to 24-d via the signal line 32. The oven signal causes the buffers 24-a to 24 to
-d, the buffer of the corresponding color is opened, and the image signal is written into the corresponding image memory 25-a, 25-b, 25-c, 25-d. At this time, the MMU 27 determines the address on the image memory 25-d held by the four matching marks 6d-2 (see FIG. 4) of the first read color-separated original 6d (see FIG. 7 (A)). .

The image information of the color-separated original read thereafter is written to the image memories 25-a to 25c at the same address as the first image information read. Therefore, before actually reading the image, the position of the match mark (6d-2), etc. is first read by pre-scanning (pre-scanning) and written into the image memory 25-a to 25-c without any operation. The CPU 29 calculates the address of image information such as match marks when
Figure 7 (B) Fuyuhi, shellfish).

Furthermore, the CPL129 performs address correction calculations so that these calculated addresses become the same as the addresses (see FIG. 7(A)) on the image memory of the first read image (see FIG. 7(C)). Then, the MMiI 27 performs a coding process based on the calculation, creates an address, and sequentially writes the image information onto the image memory.

By doing this, the color separation originals 6d and 6a of each color are
, 6b, 6c, the image information can be stored in the image memory without strict alignment for each color on the original glass platen 2a, and the image information stored in the image memory can be easily read. It will be a good thing if you can read it out. That is, the image memories 25-a, 25-b, 25
-c, 25-d, when reading out the image information written to the subsequent buffers 26-a, 2B-b, 26, by the same buffer operation as when writing the image information described above.
By opening one of -c and 26-d, the same address is read out.

Also, when the three-color mode switch 4a (see Figure 2) is pressed and the image signals are read out in the order of Y, M, and C, the Y buffer 26-a must be opened (opened). 7 read from the image memory 25-a and OR the Y (yellow) signal and the aX (black) image information that is always read from the BK image memory 25-d via the signal line 37-d via the buffer. ) The BK color information can be included in the seven color information by performing a logical product in the circuit 28-a. Similarly, BK (
(black) color information can be included.

Furthermore, by turning on the changeover switch 30 to the three-color mode side and outputting from the output signal line 38, the printer unit 1 receives the same pixel or ON signal for each of the three colors Y, M, and C, and the colors are Y.

M,C! - Output is black due to color mixing of color.

In this embodiment, an electrophotographic printer was used as the printer unit 1, but the present invention is not limited to this. It can be applied to any type of recording device that outputs color images using signals. Further, in this embodiment, the reader part 2 is of a type that reads reflected light from the document, but the invention is not limited to this, and a type of reader that reads transmitted light may also be used. Further, although the reader part 2 is incorporated in the printer part 1, the present invention can also be applied to a system in which the printer part 1 receives four color separation signals from the outside or manually.

It can also be applied to a reader that reads a full-color original and outputs color separation signals of four colors.

〔effect〕

According to the present invention, it is possible to obtain the effect that four-color separation codes can be input to a recording section having a three-color developing section.

Therefore, according to the present invention, a three-color development type recording device can handle four-color image generation codes of ylM, C, and Bx (black), and black balance with a high maximum density and a large comma value. It has the advantage of providing a good image.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing the external appearance of the embodiment of the present invention, and FIG. 3 is a sectional view showing the internal structure of the embodiment device of FIG. FIG. 4 is a plan view showing the configuration of a color-separated original according to an embodiment of the present invention, FIG. 5 is a flowchart showing the operating procedure of the embodiment of the present invention, and FIG. 6 is a circuit diagram showing the circuit configuration of the embodiment of the present invention. 7(8) to (C) are explanatory diagrams showing the functions of the CPU in FIG. 6. DESCRIPTION OF SYMBOLS 1...Printer section, 2...Part of the reader, 2a...Original platen crow, 4a...3-color development output selection switch/display lamp, 5
．． 5a-5d...Color separation reading instruction lamp, 6.68-6
d... Color separation original, 6d-1... Image area, 6d-2... Alignment mark, 24-a to 24-d, 26-a to 26-d = Buffer, 25-a to 25 -d... image memory, 27.
... Image memory management unit (MMIJ), 28-a
~2B-c=-OR circuit, 30... changeover switch. The basic structure of Shikuse 11 ゛zohosu pro-so 7 diagram Figure 1 (A (B) (C) implementation f river QPUa')

Claims (1)

[Claims] 1) In a multicolor image forming apparatus that reproduces a color image based on color separation signals of four colors including a black color separation signal, the black color separation signal and other color separation signals are each 1. A multicolor image forming apparatus comprising: a composition means for synthesizing to obtain recorded color signals of three colors; and a reproduction means for sequentially reproducing images based on the record color signals obtained by the composition means.