JPH02230244A - Print document protection system - Google Patents

Abstract

PURPOSE:To sends a charge holding medium to respective printing stages and to secure the protection of a printed document by using the charge holding medium as a printed document for the printing stages. CONSTITUTION:The printed document 9 is read by an electrostatic camera 3 and its input image is decomposed by a color separation filter into an R, a G, and a B image. Then a specific voltage is applied between a photosensitive body 7 and the charge holding medium 1 to form an electrostatic latent image corresponding to an image on the charge holding medium 1. This charge holding medium 1 is read by a read head 11 and read in a signal processor 15, and a color image is displayed on a CRT 19 after specific image processing; and the color image and planning information data are recorded electrostatically on the charge holding medium 1 through a recording head 23. Thus, the charge holding medium 1 is used instead of using the printed document such as a color document, so the printed document 9 can securely be protected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printed document protection system in which a charge holding medium plays the role of a printed document in a printing process.

[Conventional technology]

Generally, in the printing process, for slide printing manuscripts ordered by customers, the planning department specifies the magnification and trimming of which parts of the manuscript should be cut out and plate-made. For example, in the case of specifying trimming, place the tracing bar on top of a 35IIIIII1 document, copy the picture pattern with a pencil and specify the trimming part, and also write the enlargement magnification on the tracing paper. is attached to the plastic bag containing the printing manuscript with cellophane tape, etc., and sent along with the process chart to the printing process.

Figure 7 is a diagram explaining the specification of such trimming.
From a printed document as shown in FIG. 7(a), a portion to be trimmed is specified by writing it lightly with a pencil on the printed document as shown in FIG. 7(opening).

[Problem to be solved by the invention]

In this way, in conventional printing systems, the planning department writes planning information such as trimming positions and enlargement magnification onto tracing paper, and this information is sent to each process together with the printed manuscript, so tracing is performed during the process. Inconveniences such as the racing coat peeling off and staining the manuscript have occurred.

The present invention is intended to solve the above-mentioned problems, and is a printed manuscript protection system that is capable of reliably protecting printed manuscripts by flowing a charge holding medium on which printed manuscript information and planning information are recorded during each printing process. The purpose is to promote

[Help to solve problems]

To this end, the printed original protection system of the present invention includes a means for reading an electrostatic latent image of a charge holding medium in which a printed original is recorded as an electrostatic latent image by voltage application exposure, and a signal for processing the read electrostatic latent image data. A printing device comprising a processing means, a display means for displaying an image based on electrostatic latent image data, and a recording device for recording signal-processed electrostatic latent image data on a charge-holding medium, and performing a printing process on the charge-holding medium. It is characterized by being used as a manuscript.

[Effect]

The present invention records a printed original as an electrostatic latent image on a charge-retaining medium, and also records planning information such as trimming designation and enlargement magnification designation on the charge-retaining medium on which the printed original is recorded. Since it is sent to the printing process as a substitute for the printed original, the printed original can be reliably protected.

〔Example〕

Examples will be described below with reference to the drawings.

FIGS. 1A and 1B are diagrams showing the configuration of a printed document protection system of the present invention. In the figure, 1 is a charge retention medium, 3 is a camera, 5 is a color separation filter, 7 is a photoreceptor, 9 is an original,
11 is a reading head, 13 is an amplifier, 15 is a signal processing device, l7 is a memory, l9 is a CRT, 21 is a human power device,
23 is a recording head.

In FIG. 1(a), a printed original 9 is read by an electrostatic camera 3. In FIG. The electrostatic camera 3 is equipped with a color separation filter 5, a photoreceptor 7, and a charge holding medium 1, and the color separation filter 5 converts a human image into R, G. Decompose into B images. A predetermined voltage is applied between the photoreceptor 7 and the charge retention medium 1, and the portion of the photoreceptor 7 that is irradiated with light exhibits conductivity, and discharge occurs between the photoreceptor 7 and the charge retention medium in that portion. As a result, an electrostatic latent image is formed on the charge retention medium l in accordance with the image.

A recording method using such a charge holding medium will be explained with reference to FIG. In the figure, 1 is a charge retention medium, 1a is an insulating layer, 1
b is a charge retention medium electrode, lc is an insulating layer support, 2 is a photoreceptor, 2a is a photoconductive layer support, 2b is a photoreceptor electrode, 2C is a photoconductive layer, and E is a power source.

In FIG. 2, exposure is performed from the photoreceptor 2 side! ! First, a photoconductive layer support 2a made of glass with a thickness of Im is prepared.
Above is a transparent photoreceptor electrode 2 made of ITO with a thickness of 1000 mm.
b is formed, and a photoconductive layer 2C of about 10 μm is formed thereon to constitute the photoreceptor 2. The charge holding medium 1 is placed with respect to the photoreceptor 2 with a gap of about 10 μm in between. The charge retention medium 1 is formed by forming an Al electrode 1b with a thickness of 1000 μm on an insulating layer support IC made of glass with a thickness of 1 mm by vapor deposition, and an insulating layer 1 with a thickness of 10 μm on this electrode lb.
It is formed by a.

First, as shown in FIG. 2(a), 1
Set the charge retention medium 1 through a gap of about 0 μm,
As shown in Fig. 2 (opening), the electrodes 2b and 1b are
A voltage is applied between them. In a dark place, since the photoconductive layer 2C is a high-resistance material, no change occurs between the electrodes. When light is incident from the photoreceptor 2 side, the photoconductive layer 2C in the portion where the light is incident exhibits conductivity, a discharge occurs between the photoconductive layer 2C and the insulating layer 1a, and charges are accumulated in the insulating layer 1a.

When the exposure is completed, turn off the voltage as shown in Figure 2 (c).
The formation of the electrostatic latent image is completed by setting the FF to FF and then taking out the charge holding medium 1 as shown in FIG. 2 (2).

Note that the photoreceptor 2 and the charge holding medium 1 may be connected not in a non-contact manner as described above, but in a contact type. In the case of a contact type, a positive or negative charge is applied from the photoreceptor electrode 2b side to the exposed portion of the photoconductive layer 2C. A charge is injected, this charge is attracted to the electrode 1b on the side of the charge holding medium 1, passes through the photoconductive layer 2C, and the charge movement stops when it reaches the insulating layer la surface, and the injected charge is accumulated at that location. be done. Then, when the photoreceptor 2 and the charge holding medium 1 are separated, the insulating layer 1a is separated with the charges stored therein.

When this recording method is used for planar analog recording, high resolution can be obtained similar to silver salt photography, and the insulating layer formed is
The surface charge on a is exposed to air passage, but since air has good insulating properties, it will not discharge and will be stored for a long time regardless of whether it is in a bright or dark place.

The charge storage period on the insulating layer la is determined by environmental conditions, the properties of the insulator, etc., and is influenced by the charge trapping characteristics of the insulator in addition to the insulating properties of air. In the above explanation, charge is explained as a surface charge, but injected charge may simply cause an M product on the surface, or it may microscopically penetrate into the interior near the surface of an insulator, creating electrons within the structure of the material. Alternatively, holes may be trapped, resulting in long-term storage. Further, the surface of the insulating layer 1a may be covered with an insulating film or the like for storage in order to prevent physical damage to the charge holding medium and discharge when the humidity is high.

When recording a color image on a charge retention medium, R, G
．． Either record on three charge holding media for R.B or R.B. G. Either method may be used, in which a mask corresponding to H is used, the mask position is shifted, and the same charge holding medium is exposed three times.

A method for recording color image information will be explained with reference to FIGS. 3(a) and 3(b).

In FIG. 3(A), an original 43 is irradiated with a light source 41 or 42, and the reflected or transmitted light is surface-exposed onto the photoreceptor 2 through a color filter 45 and recorded on a charge holding medium. The color filter 45 consists of three elements, R, G, and B, and by moving this in the horizontal direction, R, G, and
, B is selected, and recording of one image information is completed with one set of charge holding media.

In FIG. 3 (mouth), the color filter 46 is of a rotating type, and except for selecting RSG and B by rotating the color filter 46, the third
This is the same as the case in Figure (a).

In this way, a color image of the printing original 9 is formed on the charge holding medium 1.

As shown in FIG. 1, this charge holding medium 1 is read by a reading head 1l and read into a signal processing device 15 formed by a computer or the like.

An example of the image potential reading method in this case will be explained with reference to FIG.

In FIG. 4, the potential reading section 51 is connected to the charge holding medium 1.
When the detection electrode 53 faces the charge storage surface, an electric field generated by the charges accumulated on the insulating layer la of the charge storage medium 1 acts on the detection electrode 53, and an electric field equivalent to the charge on the charge storage medium 1 is induced on the detection electrode surface. Electric charge is generated. Since the capacitor 57 is charged with an equal amount of charge of opposite polarity to this induced charge, a potential difference corresponding to the accumulated charge is generated between the electrodes of the capacitor, and by reading this value with a voltmeter 59, the potential of the charge carrier is determined. You can ask for it. Then, by scanning the surface of the charge holding medium with the potential reading section 5l, the electrostatic latent image can be output as an electrical signal. Note that if only the detection electrode 53 is used, an electric field (line of electric force) due to charges in a wider range than the area facing the detection electrode of the charge holding medium acts, resulting in a decrease in resolution, so a grounded guard electrode 55 is arranged around the detection electrode. You can do it like this. As a result, the lines of electric force are oriented perpendicularly to the surface, so that the lines of electric force only act on the area facing the detection electrode 53, and the potential of the area approximately equal to the area of the detection electrode 53 is read. be able to.

Since the accuracy and resolution of potential reading vary greatly depending on the shape and size of the detection electrode and guard electrode, and the distance between them and the charge retention medium, it is necessary to find and design optimal conditions according to the required performance.

Next, in the signal processing device 15 shown in FIG. 1 (portion), predetermined image processing is performed and a color image is displayed on the CRT 19. In the planning information department, while looking at this color image, the input device 21 manually inputs data such as specifying the part to be cropped or specifying the enlargement magnification. Then, the color image and planning information data are electrostatically recorded from the signal processing device 15 onto the charge retention medium 1 through the recording head 23.

FIG. 5 shows a charge-holding medium on which a color image and planning information are recorded, where A shows the printed original image and B shows the electrostatic latent image on which the planning information has already been obtained. By thus recording the printing original and planning information on the charge holding medium and sending this to the printing process instead of the printing original, it is possible to completely prevent the printing original from being damaged or smeared in each process, which conventionally occurs.

In addition, in the case of recording from the signal processing device 15 to the charge retention medium 1 by the recording head 23 in FIG. There are methods such as optically modulating laser light using the output from the signal processing device 15 and recording by applying a voltage to the charge holding medium while scanning the modulated laser light, and ion deposition method.

FIG. 6(A) shows a method of optically modulating laser light using the output from the signal processing device 15 shown in FIG. This signal is converted into an analog signal, and the laser beam from the laser 61 is modulated by using this signal as a modulation force of the optical modulator 63, and the linear photoreceptor 2 is irradiated with the polygon mirror 64, thereby sequentially recording on the charge holding medium 1.

FIG. 6 (opening) is a diagram showing the ion deposition method, in which a corona discharge is generated between the charge holding medium l and the electrode 7l, and a predetermined amount is applied to the gate electrode 75, which is insulated by the electrode 71 and the insulator 77. A voltage is applied, and this voltage control controls the attraction of the corona 73 onto the charge holding medium 1 to form an electrostatic latent image.

〔Effect of the invention〕

As described above, according to the present invention, since a charge retention medium is used in place of a printed original such as a color original, damage to the original can be prevented, and planning information can be set by viewing it on a display such as a CRT. The planning work can be streamlined because the planning process can be carried out while the printing process is in progress, and since the planning information and the manuscript information are recorded on the same medium, it is possible to reliably prevent the printing process from being performed incorrectly due to confusion between the manuscript and the planning information. Can be done.

[Brief explanation of the drawing]

Figures 1 (a) and (opening) are diagrams showing the configuration of the printed original protection system of the present invention, Figure 2 is a diagram for explaining the principle of the recording method on a charge retention medium, and Figure 3 is a color image. Figure 4 is a diagram for explaining the method of recording potential, Figure 5 is a diagram showing the data recorded on the charge retention medium, Figure 6 is the recording on the charge retention medium. FIG. 7 is a diagram for explaining the method, and FIG. 7 is a diagram for explaining the conventional trimming designation. DESCRIPTION OF SYMBOLS 1... Charge retention medium, 3... Camera, 5... Color separation filter, 7... Photoreceptor, 9... Original, 11...
-Reading head, 13...Amplifier, 15...Signal processing device, l7...Memory, 19...CRT, 21
...Input device, 23... Recording head. Figure 1 (a) 5l! Figure 1 (Partial) Applicant Dai Nippon Printing Co., Ltd. Agent Patent Attorney Masanobu Hirukawa (5 others) Figure 4 (A) (Partial) (C) (2) Figure 6 Figure (A) Figure (A) a-42 Figure (mouth) α~42 1-1E==Y Figure (A) (mouth)

Claims (2)

[Claims] (1) A means for reading an electrostatic latent image of a charge holding medium on which a printed original is recorded as an electrostatic latent image, a signal processing means for processing the read electrostatic latent image data, and a means for processing the electrostatic latent image data based on the electrostatic latent image data. What is claimed is: 1. A printed original protection system comprising: a display means for displaying an image; and a recording means for recording signal-processed electrostatic latent image data on a charge holding medium, and the charge holding medium is used as a printing original in a printing process. (2) The printed manuscript according to claim 1, further comprising an input device for inputting planning information such as an enlargement magnification and a cutting position into the signal processing means, and the input planning information is recorded on the charge holding medium together with the printing manuscript information. protection system.