JPS6363900B2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, when creating printing plates, color-separated films from originals are pasted onto one transparent film for each color, and color-separated films from several types of originals are pasted onto a single transparent film. It is well known that a transparent film for each color is pasted in accordance with a predetermined layout and used as an original film. In this case, it is necessary to check whether the images on the pasted color separation film match each color. For example, in the case of four colors (yellow, red, eye, and black), one way to check is to use one of these as the standard, and then print the other one on top of it.
Check the registration by superimposing the original film of the plate,
A method is known in which the remaining plates are similarly stacked on top of the reference plate to confirm their register.

In such a case, there is a drawback that it is difficult to confirm whether or not the registration is correct because the reference original film and the other original films are both positive or negative.

For example, in the case of the four colors of yellow, red, eye, and black, a method to remove such defects is to create a film with a reversed image from one of the original films, and then print that film. There is a method of superimposing another original film as a reference master film and checking the registration in the same manner as described above. In this case, it is easy to check the registration because the reference master film and other original films have a positive-negative relationship, but an extra film is required to make the master film. However, new inconveniences arise in terms of cost and time.

The present invention aims to eliminate the drawbacks and inconveniences seen in the conventional methods and to provide a new device that can instantly confirm whether or not the registration of each color of the original film is correct. It is something to do.

That is, according to the apparatus of the present invention, it is possible to photograph an original film at high magnification using a television camera, and to check whether or not the registration between each color is correct with the image reproduced on a color monitor very easily and reliably. You can.

In addition, by switching the lens to a low magnification, it is possible to easily check for cross-overs with plain mesh, duplicates of characters, etc.

The present invention will be explained in more detail below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of the film inspection device of the present invention, which performs typical color printing using four colors: Y (ki), M (red), C (eye), and BL (darker). An example is shown below.

In FIG. 1, original films 2 corresponding to Y, M, C, and BL are placed on an original film holding plate 1.
3, 4, and 5 are placed. These original films 2, 3, 4, and 5 are placed at predetermined positions on the original film holding plate 1 by an appropriate conventional method such as a method using a punch system, and are then placed on the original film holding plate 1. Placed original film 2,
3, 4, and 5 may be curled or misaligned during operation, so it goes without saying that this should be prevented by appropriate methods of the prior art, such as using a vacuum adsorption method. That's true.

The method of placing the original films on the original film holding plate is not limited to the method of arranging them horizontally in a line as shown in Figure 1, but any arrangement method such as the method of arranging them in a cross-section may be used. There are no restrictions, so you can choose the method that is easiest to use depending on your needs.

In the apparatus of the present invention, the television cameras 7, 8, 9, and 10 for photographing the original films 2, 3, 4, and 5 placed on the original film holding plate 1 are as follows:
They are arranged at predetermined positions corresponding to the respective original films 2, 3, 4, and 5 of a camera mounting base 14 having a one-piece structure shown in FIG. It has a structure that allows it to move parallel to the holding surface of the original film holding plate 1 so that enlarged photography can be performed.

In the apparatus of the present invention, in order to improve the plate inspection ability, each television camera has two types of lenses 7', 8', 9', 10' and 7'', 8'' with different magnifications.
9" and 10", and these lenses are mounted on a lens mounting base 15 that can be moved based on the camera mounting base 14 shown in Fig. 2, and can be switched depending on the purpose for shooting. It has a structure that allows you to change the magnification.

an original film 2 illuminated by an illumination light source 6;
The optical images of 3, 4, and 5 are obtained by lenses 7', 8', 9',
10' or lenses 7'', 8'', 9'', and 10'' at a desired size, the image is formed on the tube surface of the image pickup tube built into the television camera 7, 8, 9, and 10, and converted into an electrical signal. converted.

Image signals Y, M, C, converted into electrical signals
The BL is subjected to various signal processing in a signal processing circuit 11 and is input to a matrix circuit 12.

In the matrix circuit 12, image signals Y, M,
Processing such as mixing and amplifying C and BL and converting the signals into R (red), G (green), and B (blue), which are the three primary color signals of a color television, is performed. Signal processing circuit 11 and matrix circuit 12 form an electrical signal processing device.

The image signals thus converted into R, G, and B are input to the color monitor 13, and a composite image of the original films of each color is displayed in color on the screen of the color monitor. Now, by setting the lens to the high magnification side and photographing the four-color original film, and looking at the image on the color monitor where the image signals are synthesized and displayed, you can instantly check whether the registration is out of order or not.

In other words, if the color of a certain plate is misaligned, the color of that plate will be displayed on the color monitor,
This makes it extremely easy to check whether the register is correct or not.

On the other hand, at high magnification, only a very narrow area of the original film is displayed on the color monitor, making it unsuitable for checking overlays with plain dots or for checking overlapping characters. In such applications, if the lens is switched to the low magnification side and a wide range of the original film is displayed on a color monitor, the quality of the original film can be judged very easily and instantaneously.

In this way, it is possible to judge the quality of the original film, but there are some defects in lenses due to the manufacturing process, etc.
There are variations in focal length and optical axis tilt among individual lenses, and there are also errors in the mounting base.
For this reason, even if you use lenses 7', 8', 9', and 10' to perfectly align the registrations of TV cameras 7, 8, 9, and 10, the lenses 7'', 8'', and
If you switch to the 9″ or 10″ side, the registration will shift.

One way to solve this problem is to strictly select lenses, but this method is extremely expensive and cannot be put to practical use. Therefore, in the apparatus of the present invention, it is possible to electrically and automatically correct the positional deviation of the optical image on the image pickup tube surface and the deviation in the size of the image frame that occur when switching lenses. In other words, the deviation of the optical image caused by switching lenses is corrected using the deflection circuit of the image pickup tube.The amount of correction required when switching lenses is preset, and this preset is used when switching lenses. By operating in conjunction with each other, good registration can always be obtained even when switching lenses.

Registration deviations caused by lens switching can be broadly classified into image frame size deviations caused by deviations in focal lengths of lenses, and image frame position deviations caused by optical axis inclinations. Therefore, to electrically correct these, the vertical deflection amplitude, horizontal deflection amplitude,
Four items, vertical deflection centering and horizontal deflection centering, are sufficient. Therefore, in the device of the present invention, an adjuster for adjusting these is provided exclusively for each lens, and these adjusters are linked with lens switching. Good registration can be maintained by switching between the two.

FIG. 3 shows a block diagram of a deflection circuit that can control the deflection of the image pickup tube of a Y-size television camera in conjunction with lens switching as described above.

The image pickup tube 20 in the Y-version television camera 7 is deflected in the horizontal and vertical directions by a horizontal deflection coil 21 and a vertical deflection coil 22, respectively.

Horizontal deflection is controlled as follows. First, each lens is equipped with a horizontal amplitude adjuster for adjusting the horizontal amplitude and a horizontal centering adjuster for adjusting the horizontal centering. A horizontal amplitude adjuster 23 and a horizontal centering adjuster 24 are shown, and for the lens 7'', a horizontal amplitude adjuster 25 and a horizontal centering adjuster 26 are shown.

Each of these adjusters can be switched to one for each lens by switches 27 and 28 in response to switching of lenses. Each of these adjusters is adjusted (preset) in advance so that it is in the optimum condition for each lens.

The output from the horizontal amplitude adjuster and horizontal centering adjuster for each lens is output from switches 27 and 28.
Either the output for the lens 7' or the output for the lens 7'' is selected by the input terminal and inputted to the amplifier 29, amplified by the amplifier 29, and then inputted to the horizontal deflection coil 21. be done.

Vertical deflection is controlled similarly to horizontal deflection. In other words, each lens is provided with a vertical amplitude adjuster that adjusts the amplitude in the vertical direction and a vertical centering adjuster that adjusts the centering in the vertical direction. indicated by the vertical amplitude adjuster 30 and the vertical centering adjuster 31, and the lens 7″
The functions are shown as a vertical amplitude adjuster 32 and a vertical centering adjuster 33.

Each of these adjusters should be adjusted in advance so that it is in the optimum condition for each lens, and the output from each of these adjusters should be changed to the output for lens 7' by switches 34 and 35. or the output for the lens 7'' is selected and inputted to the amplifier 36, amplified by the amplifier 36, and then inputted to the vertical deflection coil 22 to control the horizontal deflection. The same is true for .

Switches 27, 28, 34, 35 are lenses 7'
When the lens 7'' is used, all the lenses are connected to the respective adjusters for the lens 7', and when the lens 7'' is used, all the adjusters are connected to the respective adjusters for the lens 7''. Switch 27, 28, 34, 3
5 is designed to be switched in conjunction with switching of lenses, and this switching can be performed as follows. That is, a switching relay 38 is activated by a switch 37 that is linked to switching of lenses, and switches 27, 28, 34, and 35 are switched by a signal from this switching relay 38.

The switch 37 that is linked to lens switching is the second switch.
As shown in the figure, it can be attached to a camera mounting base 14. When the lens mounting base 15 is moved to switch lenses, the lens mounting base 15 pushes the switch 37 attached to the camera mounting base 14, and the switch is switched in conjunction with the lens switching. It will be done.

Although the case where two types of lenses are provided has been described above, even if there are many types of lenses, the same configuration can be achieved by providing the same number of adjusters as the number of lenses.

FIG. 4 is an explanatory diagram of the appearance of the apparatus of the present invention.

Camera and camera mounting base are X-axis drive mounts 40
The X-axis drive frame 40 can slide on the X-axis rail 41 in the X direction.

The X-axis rail 41 is attached to a Y-axis drive frame 42, and the Y-axis drive frame 42 moves the Y-axis rail 43 attached to the original film holding plate 1 in a direction perpendicular to the X-axis rail 41. The original film holding plate 1 is held by a frame 44.

In this way, the television camera can be moved arbitrarily in the X and Y directions and can take pictures at any position. The images of each original film photographed by each television camera are converted into electrical signals, processed by an electrical signal processing device, and then synthesized and displayed on a color monitor 13.

The black-and-white monitor 45 is used to adjust the position of images from each television camera, and since a black-and-white monitor has a higher resolution than a color monitor, adjustments can be made with higher precision. Oscilloscope 46
is used to view the electrical signal waveform and reproduction curve of each image.

The operation panel 47 performs operations such as selecting whether to display the signal in a positive or negative manner, adjusting the gradation, for example, correcting the middle tone, correcting the gradation of highlights and shadows, adjusting the white level, and adjusting the black level. It is particularly effective for checking not only the registration of the original film but also the color tone of the color separation film.

As described above, the present invention simplifies registration confirmation.
This speeds up the process, improving the efficiency and accuracy of film inspection, and improving the registration accuracy, which improves the efficiency of proof printing, and reduces the number of reprints due to registration errors during proofing, resulting in material cost savings. I can do it.

Furthermore, the efficiency of proof printing is improved and misregistration in printing is reduced, so it is possible to improve the efficiency of printing.

Conventionally, the registration of the original film was left up to the retoucher, so there were constant problems with registration errors during proof printing and final printing.However, with the present invention, it is possible to quickly inspect the plate using an inexpensive device, and it is possible to eliminate registration errors. In addition to drastically reducing the trouble caused by this method, it is also highly effective in interlacing flat nets and checking for duplicates of letters, etc.

Further, according to the device of the present invention, it is possible to check whether letters or pictures have fallen off or not, whether there is dirt or not, and when it is necessary to correct pasted letters, etc., whether the letters, etc. to be corrected are correctly corrected. It is possible to efficiently and easily confirm whether or not the information is present.

Furthermore, according to the apparatus of the present invention, in addition to the above-mentioned effects, it is also possible to predict the color tone of printed matter from the color separation film at the same time as with conventionally known apparatuses, dramatically increasing the efficiency of inspecting original printing plate films. improve.

Furthermore, according to the present invention, the deflection of the television camera is controlled in conjunction with the switching of the lens to match the switched lens, so that inspection of the original film can be performed more efficiently.

[Brief explanation of drawings]

Fig. 1 is a schematic illustration of the film plate inspection device of the present invention, Fig. 2 is an explanatory diagram of the mounting state of the lens and television camera of the device of the invention, and Fig. 3 is an illustration of the image pickup tube of the television camera for Y-plates. FIG. 4 is a block diagram of a deflection circuit for controlling deflection, and FIG. 4 is an explanatory diagram of the overall appearance of the apparatus of the present invention. 1... Original film holding plate, 2-5... Original film, 6... Illumination light source, 7-10... Television camera, 7'-10'... Lens, 7''-10''... Lens, 11... ... Signal processing circuit, 12 ... Matrix circuit, 13 ... Color monitor, 14 ... Camera mounting base, 15 ... Lens mounting base, 20 ...
Image pickup tube, 21...Horizontal deflection coil, 22...Vertical deflection coil, 23, 25...Horizontal amplitude adjuster, 2
4,26...Horizontal centering adjuster, 27,2
8, 34, 35, 37...Switch, 29, 36
... Amplifier, 30, 32 ... Vertical amplitude adjuster, 3
1, 33... Vertical centering adjuster, 40...
X-axis drive frame, 41...X-axis rail, 42...Y
Axial drive frame, 43... Y-axis rail, 44... Frame, 45... Black and white monitor, 46... Oscilloscope, 47... Operation panel.

Claims (1)

[Claims] 1. A plurality of lenses having an original film holding plate for holding a plurality of printing original films, and a mechanism for switching between at least two types of photographing lenses for photographing images of each original film held on the holding plate. a television camera, an electric signal processing device for displaying the electric signals from the plurality of television cameras in a composite manner on a color monitor in correspondence with each color of the original film, and an electric signal processed by the electric signal processing device. and a color monitor for displaying signals, and controls the deflection operation of at least one television camera among the plurality of television cameras in conjunction with a switching mechanism that switches photographing lenses of the plurality of television cameras. A film inspection device characterized by: