JPS60170857A - Stencil paper processing device - Google Patents

Abstract

PURPOSE:To eliminate the problem of the positioning of an original and to attain clear color reproduction faithful to the original by obtaining process signals for polychromatic overprinting from one original through color separation optical systems and specific color separating circuits. CONSTITUTION:Reflected light of light projected on a scanning point on the original from an illumination lamp is separated three primary color light beams of R, G, and B through three kinds of dichroic mirrors which are arranged in sesies, and those light beams are passed through three photodetecting elements and preamplifiers to obtain analog signals AR, AG, and AB of R, G, and B. Those signals are compared with reference voltages RR, RG, and RB by comparing circuits 15R, 15G, and 15B, and their difference signal are passed through inverting gates 16R, 16G, and 16B and inverted into a cyan signal S'C, a magenta signal S'M, and a yellow signal S'Y, which are supplied to an AND gate 17 to output black print process signals. Then, process signals of cyan, magenta, and yellow are obtained from AND gates 19C, 19M, and 19Y with the signal from an inverting gate 18 to reproduce clear colors faithful to the original.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention scans the irradiated surface of a document, converts the state of the document surface into an electrical signal, adds a recording stylus to the surface of the recording material, and performs plate making for multi-color printing. In detail, the mimeograph base paper making device has a built-in color separation optical system that separates the color state on the document into three primary colors, converts each into an electrical signal, and converts it into an electric signal to be sent to the black plate via a color separation circuit. The four plate-making units, including the following, relate to a mimeograph base paper plate-making device that allows plate-making and overprinting.

2. Description of the Related Art Conventionally, when making plates for multicolor printing using a mimeograph base paper plate making machine, it has been known to write as many manuscripts as the number of plates and make plates for each specific color only. That is, in this case, each original and recording paper are wound around a drum, the original surface is scanned, the state of the original (black and white, etc.) is converted into an electrical signal, the signal is amplified by an amplifier and applied to the recording needle, and then the vinyl Perforations are made on the surface of recording paper such as base paper, and plate making for each specific color is performed separately. In this case, there are disadvantages in that as many manuscripts as there are plates are required, and furthermore, it is difficult to align them. Also, recently, it has become possible to make plates for multicolor printing from a single sheet of original by color separation.

However, in all of the above methods, plate making is performed only for a specific color, and plate making for obtaining intermediate colors (plate making for three-color overprinting) is not performed because the colors become cloudy. Furthermore, even if black is layered on top of black to avoid poor black reproducibility due to simple overprinting of three colors, the black and color will become muddy.

Kihatsu (the moon was made in view of the above points,
This system uses a built-in color separation optical system and a new color separation circuit to obtain prepress signals for multicolor overprinting, which not only solves the problem of alignment of the original, but also improves the accuracy of the original. To provide a new mimeograph base paper plate-making device capable of faithful and clear color reproduction (clear and clear hues).

For this reason, the present invention is capable of producing ink from the three primary colors of red, green, and blue.
The plate making signal of the plate is extracted and combined with the three plate making signals of cyan plate, magenta plate, and yellow plate, and four plate making signals are generated. In order to eliminate drawbacks such as poor color reproducibility (brownish and muddy), when reproducing black, plate making is performed using only the black plate making signal, and the other three plate making signals are blocked, ensuring faithful color reproduction. 1 piece of clear stamp stamp! It makes I possible.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram of a mimeograph base paper making apparatus according to the present invention.

In the figure, (1) is a document, and (2) is a recording paper, which are wound around a drum (3). Recording base paper (2) is made by polymerizing a special vinyl layer (2C) on the surface of paper (2b) coated with a conductive coating (2a) such as carbon, as shown in Figure 2, and then recording on the surface. A surface layer (2d) is applied to obtain a visible image of the recorded object, and about 50% is applied between the conductive coating (2a) and the recording needle (4).
By applying a voltage of 00V, the vinyl layer (2c) and the surface layer (2d) are destructively perforated (2), and the vinyl layer (2c) and the surface layer (2d) are perforated (2).
2C) is peeled off together with the surface layer (2d) and used as a mimeograph base paper.

(5) is an illumination lamp for illuminating the scanning point (X) on the surface of the document t1+ wrapped around the drum (3). The scanning point of the document surface on the drum is 0.
0 and the contact point between the recording needle (4) and the surface of the recording base paper (3) move in synchronization with the rotation of the drum (3),
The contact point is configured to scan the surface of the recording material (4) in synchronization with the scanning of the scanning point (3) on the surface of the document (3).

Opposed to the scanning point (3) are an objective lens (7), a sleeve N81 for determining the resolution performance of the original, a relay lens (9), and a relay lens +9+ f! : A half mirror (HM) that separates the transmitted light into colors and reflects only the blue color while allowing other light to pass through; and a half mirror (HMI) that separates the light that passes through it and reflects only the blue color while allowing other light to pass through. Half mirror (HM) that reflects light and passes other light
t), and a condensing lens (10) that condenses the green light that has passed through the half mirror (HM2) is arranged on the same optical axis, and the half mirror (HM, ) and the half mirror (HM2) are arranged on the same optical axis.
) are installed so as to be inclined at 45° with respect to the optical axis, and the inclined half mirror (HMI) and (nMt
) A color separation optical system is formed by arranging a condenser lens (12) in a direction perpendicular to the optical axis, facing each of the condenser lenses (12), and a blue color is placed at the condensing position of the condenser lens (11). A photoelectric conversion element (PHB) for light, a photoelectric conversion element (PHR) for red light at the condensing position of the condensing lens (10), a photoelectric conversion element for green light at the condensing position of the condensing lens (10) (PHG
) are installed, and the separated three-color light is photoelectrically converted to produce three-color (analog signals) electrical signals of red, green, and blue, depending on the coloring condition of the scanning point on the document. If it occurs, it will be destroyed. The final spectral characteristics of each color including the color separation optical system and light receiving element are based on the relative sensitivity of each color to the wavelength as shown in Figure 5, and the peak of red + R + is 600 nanometers and 7C)O The green CG+ peak is around 650 nanometers, which is in the middle of nanometers.
55 between 00 nanometer and 600 nanometer
In the vicinity of 0 nanometers, there is also blue (Bl pink is 4
00 nanometer seven 500 nanometer middle 450
It has spectral characteristics with a peak near nanometers. Next, the red, green, and blue electrical signals are applied to a red signal preamplifier (13R), a green signal preamplifier (13G), and a blue signal preamplifier (13B), respectively. The signal is amplified to a predetermined signal level to obtain an amplified red analog signal (~), a green analog signal W (AG), and a blue analog signal (AB). These three analog signals are applied to the color separation circuit 16 (14+), which will be described later, to generate a black plate making signal (SJ3K).

Cyan plate making signal (Sc), magenta plate making signal (SM
).

It generates four plate-making signals: the yellow plate-making signal (SY).

That is, the third circuit diagram which is the circuit configuration diagram of the color separation circuit (14)
As shown in the figure, the three signals red analog signal (AR), green analog signal (AG), and blue analog signal (AB) are connected to the respective comparison circuits (15R), (15()),
(+5B) is the reference voltage (RR) of each red, green, and blue signal for comparison.

(RG) and (RB) are respectively applied to Yoshimo and are converted into digital signals, resulting in a red digital signal (DR), a green digital signal (Do), and a blue digital signal (DB), and each digital signal (DR) , (DG), (DB) are then inverted gates (+6R), (+6c+), (16B
) are respectively applied to the signals (DR) and (DG
) and (DB) are inverted and converted into cyan signal (Sc), magenta signal (SM), and yellow signal (Sy), which are complementary color signals of red, green, and blue. These three signals, the inverted cyan signal (Sc), magenta signal (SW), and yellow signal (Sy'), are applied to the AND gate (1), ), the black plate making signal (S-B
At the same time, the signal from the AND gate (17) is added to the inversion gate (+8), and the cyan signal (Sc) and magenta signal (S
M) and yellow signal (Sy) are applied to AND gates (19c), (19M), and (19y), respectively, to obtain cyan plate making signal (Sc), magenta plate making signal (SM), and yellow signal. 3 of the low plate making signal (Sy)
The output of the signal is blocked if there is a master-making signal for the black plate. In this way, the three analog signals (AR), (AG), and (AB) of red, green, and blue pass through the color separation circuit (+4j), and are divided into the four signals of black, cyan, magenta, and yellow. This changes the signal into two plate-making signals.

The third plate making signal (SBK) output from the color separation circuit 114), the cyan plate making signal (Sc),
The four signals of the Yasenku 1 plate printing signal (SM) and the yellow plate making signal (Sy) are selected by switching the changeover switch (20), and the selected signal is sent to the modulation circuit ρl),
The voltage increasing circuit "1" is configured to increase the voltage to a voltage suitable for perforating the recording paper and apply it to the recording needle (4) through two circuits.

Next, the operation of the device according to the present invention will be explained.

The surface of the document held on the drum (3) is illuminated by an illumination lamp (5).
, the illumination system consisting of a condenser lens (6) irradiates between scanning points, and the reflected light is transmitted to an objective lens (7),
After passing through the slit (8) and the relay lens (9), the first half mirror (HMI) separates the light into blue light, and the next half mirror (Hrv5) separates the light into red light, and each condenser lens (1ll) , +12), the light is focused on the light-receiving element (PHB) for blue and the light-receiving element (PHR) for red.
The remaining light that has passed through the MJ, that is, the green light, is passed through the condenser lens (10
), each light is focused on the surface of a green light receiving element (PHG), and each light is photoelectrically converted into electrical signals (analog signals) for each of the three colors red, green, and blue. These signals are then routed to their respective premultipliers (+3R), (1
The amplified red, green, and blue analog signals (AR), (AG), and (AB) are applied to the color separation circuit (13B) and amplified to a predetermined signal level.
Comparison circuit (15B), (+5G), (15
B) the reference voltage (RR) of each red, green, and blue signal, (
As shown in the diagram of changes in signal waveforms at each part in Figure 4, red, green, and blue analog signals (AR), (AG), and (AB) are applied together with RG) and (RB), respectively.
are the reference voltages (RR) and (RG) for each color of red, green, and blue.
, (RB) and below are cut off to become the red digital signal (DR), green digital signal (D()), and blue digital signal (DB), and these signals - are respectively input to the inversion gate (+6R) and ( +6o), (16B) are applied to the cyan signal (Sc), magenta signal (SM)
.

After being inverted to the yellow signal (SY), if there is an AND (logical product) of these three signals by the AND gate (17), the black plate making signal (SBK) is output, and at the same time, the signal from the inverting gate (18) is output. AND gate (1
9c), the cyan plate making signal (Sc), the magenta plate making signal (SM), and the yellow plate making signal (SY) are stopped at 1, and when the black plate signal (SBK) is not output, the cyan signal ( Sc), cyan plate making signal (Sc
), magenta plate making signal (SM), and yellow plate making signal (SY). The four plate-making signals outputted above are selected by a changeover switch (20), are amplified by pressure through a modulation circuit (2!11), a voltage amplification circuit (see the figure), and are recorded by a recording needle (4). Perforations are made on the surface of the original paper, and four types of plate making can be performed corresponding to the colors of the original (+).

As is clear from the above explanation, according to the AJ invention, 1
By using a built-in color separation optical system and a new color separation circuit, it is possible to make plates suitable for mimeograph printing for layered printing that faithfully reproduces colors, which is not possible with conventional mimeograph printing. Inu can provide a mimeograph base paper making device that enables faithful and clear color reproduction of originals, which was previously impossible, and contributes to reducing the cost of this type of printing such as color copying.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram of a mimeograph base paper making apparatus according to the present invention, FIG. 2 is a sectional view showing the state of making a recording base paper, and FIG. 3 is a color separation circuit. FIG. 4 is a diagram showing the changing states of signal waveforms in each part, and FIG. 5 is a comprehensive spectral characteristic diagram of the color separation optical system and the light receiving element. i+)・Manuscript, (2) Recording paper, (3) Drum, (
4)... self-recording needle, (5)... illumination lamp, (6)...
Condenser lens, (7)・Objective lens, (8)...
・Slit, (9)-・Relay lens, tIO),
(II) , (+21... condensing lens, (+3H)
. (+3c+), (13B) preamplifier, (14)
...Color separation circuit, (15R), (15G), (15B
)... Comparison circuit, (16R), (16C)). (16B), (181-inversion gate, (1η, (+
9G), (19M). (19y)...AND gate, (20)...changeover switch, (21)...modulation circuit, (2-way...voltage amplification circuit, (HM,), (HMri...half mirror ( Guicroic mirror), (PHB), (PHR)
, (PHa)... Light receiving element, (X+... Scanning point. Patent applicant: Sanryu Co., Ltd. June 25, 1980 Manabu Shiga, Commissioner of the Patent Office 1, Indication of the case 1988 Patent application No. 027784 2, Name of the invention Mimeograph base paper making device 3, Person making the amendment Relationship to the case Patent applicant Sanryusha Co., Ltd. 4, Agent 5, Date of amendment order

Claims (1)

[Scope of Claims] 1. A document and a recording base paper are wound around a drum, the surface of the document illuminated by an illumination system is scanned, the state of color on the document is separated into electric signals, and the state of color on the document is converted into electrical signals. In a mimeograph base paper making device that applies a signal to a recording needle via an amplifier and perforates the surface of the recording paper to create a mimeograph base paper for multicolor printing, the light reflected from the surface of the document illuminated by the illumination system is A color separation optical system that separates the three colors of red, green, and blue is provided to photoelectrically convert the separated three-color light. A photoelectric conversion element is placed facing the optical system, and the light from each photoelectric conversion element is Red-green,
An inverting means for inverting each blue signal into a cyan, magenta, and yellow signal, respectively, and when there is an AND of the three inverted signals, it is used as a plate-making signal for a black plate, and at the same time it is used as a plate-making signal for a cyan, magenta, and yellow plate. A color separation circuit equipped with a blocking means is provided to block the signal and output four plate-making signals of black plate, cyan plate, magenta plate, and yellow plate,
A mimeograph plate making device characterized in that the above-mentioned four plate making signals from a color separation circuit are applied to a recording needle. 2. The red, green, and blue signals from each of the photoelectric conversion elements are analog signals, and the color separation circuit inputs the analog signals through a comparison circuit, and converts the digitized signals into Cyan, magenta, and yellow signals are generated through an inversion gate, and these signals are added to the AND gate of the three signals to make a black signal, while the cyan, magenta, and yellow signals from the AND gate are generated through an inversion gate. Add each of the signals to the AND gate,
The mimeograph base paper plate-making device according to claim 1, characterized in that it is configured to obtain four plate-making signals: a black plate, a cyan plate, a magenta plate, and a yellow plate.