JPH0371704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention provides an original film for color printing.
The present invention relates to a film inspection device for checking whether color separation films of each color, halftone dots, characters, etc. are arranged at predetermined positions as specified.

(Prior art) Conventionally, when creating a master film for a four-color printing plate, various materials such as a color-separated film of a pattern original, or a plain mesh, letters, etc., were pasted on several sheets of transparent film for each color. The unexposed film is exposed several times by overlaying it with a light-shielding mask film, etc., and then developed.
It is well known to create a master film for a plate.

In this case, before creating a printing plate, check whether the image of the color separation film is in the correct register between each color on each master film, and whether the halftone dots or characters are placed in the specified position of each color as specified. You need to check whether it is.

In addition, if mistakes in the original film are discovered,
Alternatively, if there is a change in designation, etc., and the correction cannot be made by partially modifying the original film, the original film is called an old version. In order to make corrections, we first made corrections by replacing various materials pasted on several sheets of transparent film, overlapped with a light-shielding mask film, etc., exposed the unexposed film several times, developed it, and made the original film. create. This original film is called a new version, and in this way mistakes in the old film can be corrected or modifications such as designations can be made.

In this case, since the process of creating the original film is manual and complex, it is possible that even areas other than the areas where mistakes or specifications were changed may be incorrectly corrected, and such cases can cause extremely large losses. Since there are many cases, it is necessary to check whether the corrections have been made as specified.

One way to perform this kind of confirmation is to use hard copy images such as simple proofs, but these have the drawbacks of high material costs, high running costs, and the time it takes to reproduce the images. is well known.

A method to eliminate such drawbacks is to use a film original device such as FC-600 (trade name) manufactured by the same applicant to simultaneously shoot four original films with four predetermined television cameras. It is then photographed and displayed on a TV monitor as a composite image that approximates the printed matter, and on each original film, it is checked whether the color separation film images are in the correct register between each color, and whether the halftone dots or letters are placed in the specified position of each color as specified. There is a well-known method for instantly checking whether or not the computer is located in the computer. In this case, since the original films of four colors, yellow, magenta, cyan, and black are placed on the same plane as the original film holding plate, a large space is required to install the apparatus. Furthermore, the apparatus itself becomes expensive because it is necessary to obtain accurate relative positions of the four television cameras. Furthermore, since the four television cameras correspond to specific colors such as yellow, magenta, cyan, and black, new constraints arise, such as the need to place the original film at a predetermined position.

Eliminating the drawbacks or limitations of such conventional methods,
Color separation film of each color on the original film,
It has been desired to develop a new, low-cost and compact device for checking whether or not plain mesh, letters, etc. are placed at predetermined positions and as specified.

That is, the apparatus according to the embodiment of the present invention utilizes two television cameras, simultaneously photographs two original films, and converts the video signals of each television camera into yellow, magenta, cyan, black, black, and black, respectively. Check whether each color of the image of the color separation film is in the correct register on the original film by selecting and specifying one color from among blue, green, and red using the switch in the color selection circuit and displaying the composite image on the monitor TV. We have developed a film inspection device that confirms whether the dots, letters, etc. of each color are placed in the specified positions in the specified manner.

Incidentally, instead of the plurality of television cameras of the film master device as described above, it is equipped with one television camera and a storage device capable of storing a plurality of images, and images of a plurality of master films are sequentially stored in the storage device, After that, a plurality of images may be simultaneously reproduced from the storage device.

(Problems to be Solved by the Invention) By the way, one of the plate inspection operations is an inspection called tilt inspection. This is an inspection in which two original films to be inspected are placed one on top of the other, and the upper one is repeatedly turned over and overlaid to recognize and inspect image differences between the two films. Conventional film plate inspection devices or newly developed film plate inspection devices such as those described above were unable to carry out such tilt inspection, so such inspections had to be done manually. The present invention provides a film plate inspection device which is made possible by a plate inspection device.

(Specific means for solving the problem) The present invention will be described in more detail below with reference to the drawings.

The following specific example uses the newly developed plate inspection device mentioned above, which is equipped with two television cameras and obtains electrical signals of film images from two original films. It is clear that it can also be applied.

First, assuming that there is no tilt mechanism, which is the subject of the present invention, that is, the input 101 of the tilt mechanism 100 in FIG. 2 becomes the output 111, and the input 102 becomes the output 1.
The case where there is a short circuit to 11 will be explained.

As shown in FIGS. 1 and 2, two cameras 3
2 and 33 and a camera mounting base (not shown) are attached to an X-axis drive pedestal 1, and the X-axis drive pedestal 1 can slide on an X-axis rail 2 in the X direction.

The X-axis rail 2 is mounted on a Y-axis drive frame 3, and the Y-axis drive frame 3 is slidable in the Y direction on a Y-axis rail 4 mounted perpendicularly to the X-axis rail 2. The original film holding plate 5 is supported by a frame 6.

In this way, the two television cameras can be moved arbitrarily in the X and Y directions without changing their relative positions, and the pin system 7,
Two original films 8 and 9 fixed at 7' can be photographed. Further, in a television camera, the magnification can be changed by switching between several types of lenses having different magnifications, and in this embodiment, each lens has two lenses. Original film 8,9
On the other hand, it has a light source section on the opposite side from the television camera, and the light from the light source section passes through the original film and enters the television camera.

The images of the original films 8 and 9 taken by the television cameras 32 and 33 are converted into electrical signals, processed by an electrical signal processing device, and displayed on the color monitor 11 in a composite manner.

The operation panel 20 selects which color to display the video signal from each television camera among yellow, magenta, cyan, black, blue, green, and red, and selects whether to display the signal as positive or negative. , white level adjustment, black level adjustment, etc., and is particularly effective not only for checking the register of the original film but also for checking the designation of plain dots, characters, etc.

According to Fig. 2, each television camera video signal is divided into yellow, magenta, cyan, black,
A configuration for selecting and instructing one color at a time from among blue, green, and red using a changeover switch and displaying the combined colors on a monitor television will be described.

The transmitted light of the original films 8 and 9 illuminated by the light sources 30 and 31 is converted into an electric signal by the photoelectric conversion elements of the television cameras 32 and 33 corresponding to each original film. The image signal converted into an electrical signal is sent to a regulator (not shown) that adjusts the black and white level.
After being waveform-shaped in a process 38, the signal is applied to a color conversion circuit 39 through a color selection circuit 40.
In the color selection circuit 40, the image signals of the two television cameras 32 and 33 are divided into yellow, magenta, cyan, and
It consists of a large number of changeover switches for inputting to the color conversion circuit 39 in order to compositely display the colors of black, blue (magenta, cyan), green (ki, cyan), and red (ki, magenta) on a monitor TV. There is. Furthermore, since the two television cameras are synchronized by the synchronization signal 36 from the synchronization signal generation circuit 35, images in phase are output from each camera. In addition, the synchronization signal generation circuit 3
The blanking signal generated in step 5 is also in phase with the image signal.

Therefore, the level of the blanking signal generated by the synchronization signal generation circuit 35 is adjusted to be the same as the white level adjusted by the monochrome level adjuster, and this is applied to the process 38 as a pseudo image signal 37, and this white level is A pseudo image signal which is an image signal is also connected to the color conversion circuit 3.
The signal is applied to the color conversion circuit 39 through the changeover switch of the color selection circuit 40 for input to the color conversion circuit 39.

That is, the color selection circuit 40 has two television cameras 3.
The image signals from 2 and 33 and the pseudo image signal 37, which is a white image signal, are input to arbitrary inputs 41, 42, and 4 of yellow, magenta, cyan, and black of the color conversion circuit 39.
3 and 44 are provided.

The color conversion circuit 39 converts the color so that the color tone of the image reproduced on the color monitor television 11 is similar to that of the printed matter.
Ki 41, magenta 42, cyan 43, black 444
The color input image signals are mixed and amplified, converted into three color signals of blue 45, green 46, and red 47, and applied to the monitor television 11 to display a color composite image. For example, in the color selection circuit 40, the video signal of the camera 32 is used as the key 41, and the camera 3
When switching is performed so that the video signal 3 is input to magenta 42 and the pseudo image signal 37 adjusted to the same level as the white level is input to cyan 43 and black 44, the color monitor television 11 has a camera 32.
The image taken by the camera 33 is displayed as a composite image of yellow, and the image of the camera 33 is displayed as a magenta composite image. Furthermore, when the color selection circuit 40 switches the video signal of the camera 32 to key 41 and magenta 42, the video signal of the camera 33 to black 44, and the pseudo image signal 37 to cyan 43, the color monitor television 11 In this case, the image taken by the camera 32 is displayed as a red image, and the image taken by the camera 33 is a composite image with a black mark.

As described above, the newly developed film inspection device can detect the color monitor image of the original film in yellow, magenta, cyan, black, blue, etc.
You can select and display either green or red.

On the other hand, when inspecting registration, halftone dots, color classification designation of characters, etc., an example of typical color printing using four colors of yellow, magenta, cyan, and black will be described.

Place the original film magenta plate on the registration pin 7 of the film holding plate 5 and the original film magenta plate on the pin 7', and select the left camera color selection button "Y" and the right camera color selection button "M" on the operation panel 20. A two-color composite image of yellow and magenta corresponding to the original film is displayed on the color television monitor 11, making it possible to easily and instantaneously check the registration and the color-coding designation of plain halftones or letters. Next, remove the original film version and magenta version, place the original film cyan version on pin 7 and the original film tint version on pin 7', and press the left camera color selection button "C" and right camera color selection button on the operation panel. By pressing "BK", a composite image of two colors, cyan and dark, is displayed on the color TV monitor, making it easy and instant to check the registration and the color-coding designation of plain dots or text. The above is an example of color printing using typical four colors. However, when inspecting an original film that is printed using a special color (green), etc., it is necessary to By pressing the color selection buttons "Y" and "C" at the same time, a green image corresponding to the original film green plate can be displayed on the color monitor TV, making plate inspection easier and instantaneous compared to conventional plate inspection. It can be performed.

On the other hand, place the old version before reprinting and the new version after reprinting and correcting the original film with the error or the original film with correction instructions on the pins 7 and 7' of the film holding plate, and press the operation panel. By pressing the right camera "C" and left camera "M" color selection buttons, you can see the areas that cannot be corrected, the areas where mistakes have been corrected or corrected, and the areas where mistakes have been corrected that do not need to be corrected. The parts that were touched are blue,
Since the image is displayed on the color monitor television in three colors, cyan and magenta, it is convenient because the corrected part can be easily and reliably found instantly.

Next, a case will be described in which the tilt mechanism 100, which is the subject of the present invention, is inserted before the color selection circuit 40 and the tilt mechanism is operated.

This tilt mechanism 100 periodically and alternately connects an electrical signal from at least one camera to a pseudo image signal 37 corresponding to a video signal of a white paper, thereby producing an image similar to the tilt actually performed by hand. is displayed on the monitor television 11.

The cycle of switching and connecting is preferably 0.5 sec to 2 sec. This periodic switching connection is configured to be automatically switched using a timer. Furthermore, the timing of the switching connection is such that the switching is performed during the vertical blanking period to avoid noise.

Now, if the switch 104 is fixedly connected to the terminal 106 and the switch 105 is periodically and alternately connected to the terminals 108 and 109, the monitor television 11 will display the camera 33
The images appear to overlap and disappear. If the switch 105 is fixedly connected to the terminal 109 side, and the switch 104 is periodically and alternately connected to the terminals 106 and 107, the image of the camera 33 will be
Images from the camera 32 overlap or disappear. Furthermore, by interlocking both switches 104 and 105 and cyclically connecting them, images from the cameras 32 and 33 can be displayed alternately on the monitor television 11, thereby making it possible to inspect tilt.

Of course, the color of each camera's image is determined by the color selection circuit 4.
0 can be selected as appropriate. These operations are performed using the left camera button “AL” for tilt, the right camera button “AR” for tilt on the operation panel.
Alternatively, it is configured to operate by inserting the left and right tilt buttons "AL" and "AR" at the same time.

Although it is standard for the pseudo image signal to be a video signal of white paper, it does not necessarily have to be white; for example, to avoid distracting the eye, signals of a solid image that is lightly colored may be combined. May be used.

(Effects of the Invention) Since the present invention has the above structure, it has excellent practical effects as shown below.

That is, while conventional film plate inspection devices could not perform tilt inspection, the present device allows tilt inspection, and also enables tilt inspection in which each image is projected alternately, which cannot be done with manual inspection.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the overall appearance of the apparatus of the present invention, and FIG. 2 is an explanatory diagram of the electric circuit in the apparatus of the present invention. 1...X-axis drive frame, 2...X-axis rail, 3...
...Y-axis drive stand, 4...Y-axis rail, 5...Original film holding plate, 6...Frame, 7, 7'...
Pins, 8, 9...Original film, 11...Color monitor TV, 12...Monitor TV mounting stand, 2
0...Operation panel, 30, 31...Illumination light source, 32, 33...TV camera, 34...
Electrical signal processing device, 35... synchronous signal generation circuit,
36... Synchronization signal, 37... Pseudo image signal, 38
...Process, 39...Color conversion circuit, 40...Color selection circuit, 41-44...Color conversion circuit input (ki,
magenta, cyan, black) signal, 45 to 47...
Color conversion circuit output (blue, green, red) signal, 100... Tilt mechanism, 104, 105...
Switch.

Claims (1)

[Claims] 1. A mechanism for photographing two original films and outputting electrical signals of the two images, an electrical signal processing device for displaying the electrical signals of these two images in a combined manner on a monitor television, and this electrical signal. In a film inspection device consisting of a monitor television for displaying the images of the two original films in a composite manner based on the electrical signals processed by the processing device, a pseudo image signal corresponding to the white image of the printing substrate is generated. a tilting mechanism capable of periodically and alternately switching and connecting at least one electrical signal of the original film to the pseudo image signal; and a tilting mechanism capable of periodically and alternately connecting at least one electrical signal of the original film to the pseudo image signal; A film plate inspection system characterized by being equipped with a color conversion mechanism that inputs any one of yellow, magenta, cyan, and black signals and converts them into blue, green, and red signals for display on a monitor television. Device.