JPH0117566B2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, when creating a printing plate, color-separated films from an original are pasted onto a single 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 four colors of yellow, red, eye, and black, a method to remove such defects is to create a film with the opposite 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 the other original film are in a positive negative state, but since an extra film is required to make the master version, 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 confirm whether or not the registration between each color is correct by using a television camera and superimposing images on a color monitor television.

According to the present invention, it is extremely easy to check the register, and it is also possible to achieve great results in checking for cross-overs with flat nets, duplicates of letters, etc.

Further, according to the present invention, it is possible to easily know which part of the original film is being photographed by the television camera.

The present invention will be described 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 the original film holding plate 1.
3, 4, and 5 are placed. In this case, these original films need to be placed at predetermined positions on the holding plate 1, but this can be done by using a punch system or by preparing a reference line on the holding plate 1 and aligning it with this. Any appropriate method may be selected and used, and there are no particular limitations on what method to adopt. The original film placed on the original film holding plate 1 may curl and is not necessarily flat, and the original film may shift position during operation. It goes without saying that efforts should be made to prevent this.

Any appropriate means can be adopted to prevent curling or positional displacement. For example, as shown in FIG. 2 illustrating an example of the original film holding plate 1, a vacuum hole 6 is opened in the original film holding plate 1, and after the original film is placed, a vacuum pump (not shown) is connected through the vacuum hole 6. Exhaust may also be provided. In this case, the shape of the vacuum hole 6,
The position and the like are not particularly limited, and any position may be used as long as the original film can be held well.

Another method may be to place the original film on the original film holding plate and then cover it with a transparent sheet-like material such as a transparent film or transparent glass. however,
When it is necessary to make the magnification ratio very high when shooting with a TV camera (described later) (for example, about 60
(up to 80 times), it is preferable to use the vacuum method as the original film holding method.

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. Since there is no limit to the method, the most convenient method can be selected as needed, and adjustments can be made in advance so that image shifts will not occur due to the difference in the position of the television camera, which will be described later.

The apparatus of the present invention includes television cameras 7, 8, 9, and 10 for photographing the original film placed on the original film holding plate 1.

The positions of these TV cameras are set in predetermined positions and the electrical signals from each TV camera are combined to display the image on the monitor TV, so the relative position between each TV camera is If you change the
It is also necessary to vary the position where the original film is placed. Conversely, if the position where the original film is placed is changed, it goes without saying that the position of the television camera is also changed accordingly.

Images of the original film 2, 3, 4, 5 are taken by these television cameras 7, 8, 9, 10, and zoom lenses 7', 8', 9 attached to the television cameras 7, 8, 9, 10 ', 10' allows it to be enlarged to a desired size.

Alternatively, a lens with a low magnification and a lens with a high magnification may be provided so that either one can be used.

The light containing image information from the original film, which has been enlarged to a desired size and passed through zoom lenses 7', 8', 9' and 10', is sent to television cameras 7, 8, 9 and 10.
It is converted into an electrical signal by a photoelectric conversion element provided inside. The photoelectric conversion element may be a well-known device such as a vidicon, and the television camera itself may be a conventionally known device. The image signals Y, M, C, and BL converted into electrical signals are input to the electrical signal processing device 11. After the white and black levels are adjusted through a regulator 12 that adjusts the white and black levels, the electric signal processing device 11 enters the matrix 13, where each signal of Y, M, C, and BL is processed. Processes such as width amplification, synchronization, and conversion from Y, M, C, and BL signals to the three primary colors of television, R (red), G (edge), and B (blue), are performed.

The signals thus converted into R, G, and B are input to the monitor television 14, and the original film images of each color are compositely displayed in color on the screen of the monitor television.

In this way, it is possible to instantly check whether or not there is a misregistration from the image on the monitor television screen in which the four-color original film images are displayed in a composite manner. That is, if the color of a certain plate is misaligned, the color of that plate will be displayed on the monitor television, making it extremely easy to check whether the registration is correct or not.

In this way, it is possible to inspect the original printing film to see if it is in the correct register.However, when photographing with a TV camera, the inspection becomes easier by shooting at high magnification, but on the other hand, high magnification In this case, the entire original film will no longer be displayed on the monitor TV. For this reason, when the magnification is high, it becomes difficult to identify which part of the original film is being photographed.

According to the device of the present invention, it is possible to identify which part is being photographed. Third
The figure is a schematic cross-sectional view of a photographed part display device that displays a photographed part, and FIG. 4 is a plan view. In this case, a low-magnification lens and a high-magnification lens are provided, and an example is shown in which it is possible to switch between them.

Low magnification lens 23, high magnification lens 24, light source 2
5 is attached to the lens base 26. The television camera body 27 is attached to a television camera base 28, and the lens base 26 and the television camera base 28 are relatively movable in the lateral direction. The magnification lens 24 can be switched.

A mirror 29 is further attached to the lens base 26, and the mirror 29 is attached to the mirror adjustment support 3.
0 allows angle and other adjustments.

A light ray 31 emitted from the light source 25 is reflected by a mirror 29 and reaches the original film to be photographed. In this case, the position of the mirror is adjusted by the adjustment support 30 so that the light ray 31 reflected by the mirror 29 reaches the area being photographed by the television camera and spots that area.

By doing this, it is possible to easily identify that the area where the light beam 31 is spotted is the area that is actually being photographed by the television camera. In addition, light source 2
5 is preferably a powerful light source so as to be able to show small spot parts, and it is preferable to use a laser device or the like.

Note that the light source 31 may be used to always spot the photographed area, but since it is difficult to identify the photographed area at high magnification, it is only spotted at high magnification. The light source may be turned on or off using a switch, as shown in FIG. In this way, the changeover switch is, for example, as shown in FIG.
Alternatively, a switch 32 is provided on either of the television camera bases 28, and the switch is automatically connected when using the high magnification lens 24 by relative movement of the lens base 26 and the television camera base 28. Alternatively, the light source may be turned on. This will also improve work efficiency.

In the case of FIG. 3, the light source 25 is connected to the lens base 26.
The spot position of the light beam 31 is adjusted by a mirror 29.

In the above description, a case has been described in which light such as a laser beam is used, but other devices such as a wire or the like may be used to indicate the position.

Although the photographed portion display device as described above may be attached to each television camera, it is sufficient to attach it to any one television camera.

In addition, in the above, we have mainly explained the case where the mirror position is adjusted so that the spot of the light beam is the part that is being photographed by the TV camera, but in this case, the light beam itself is also the part that is being photographed by the TV camera. It will be photographed. Therefore, if you need to avoid such a thing, you can do the following.
That is, it is possible to adopt a method of attaching a filter to the lens to cut off the reflected light of the spotting light. Alternatively, the position of the mirror can be adjusted so that the spot of light is near the area being photographed by the television camera, thereby allowing the user to know that the spot is close to the area being photographed. Alternatively, the light rays may be further controlled into a frame-like shape that surrounds the area photographed by the television camera.

Furthermore, when inspecting halftone dots, it is desirable to magnify 20 times or more, but in such a case, the area projected on the monitor TV 14 will be at the very edge of the original film due to the high magnification. Since it is limited to a part, the whole thing is not displayed. In order to solve this problem, the original film holding plate 1 should be made movable in the X and Y directions. That is, as shown in Fig. 2, the original film holding plate is placed in the frame 1.
5 so as to be slidable in a certain direction (for example, the X direction), and this frame 15 is further attached to another frame 16 so as to be slidable in a direction perpendicular to the X direction (Y direction). Any means may be adopted.

Also, without moving the original film holding plate 1 in the X and Y directions, the television cameras 7, 8, 9, and 10 can be moved.
It is also possible to allow the television cameras to move together in the X and Y directions without changing the relative positional relationship between the television cameras. The television camera can be made movable in the X and Y directions using the same principle as the above-mentioned moving means for the original film holding plate. Note that the movement of the original film holding plate and the television camera in the X and Y directions is not limited to the above-mentioned means, but may be any other means such as the method employed in a universal drafting device such as Drafter (trade name). can be selected and adopted as appropriate. Further, both the original film holding plate and the television camera may be movable.

By making the original film holding plate and/or the television camera movable in this way,
Even at high magnification, the registration of four colors at any position can be instantly confirmed.

In FIG. 1, the light source section 17 is located on the opposite side of the original film from the television camera.
The light from the light source section 17 is transmitted to the original film 2, 3, 4,
5 and TV cameras 7, 8, 9, respectively.
It's starting to fall into the top 10. In this case, if the magnification is large and a portion is to be photographed, it is sufficient that the light is effective in that portion, and the light is prevented from shining on the extra portion and scattering, making it difficult to see the monitor. It is desirable to provide a light-shielding plate 18 that blocks light from the rest while leaving only the necessary parts.

Note that when moving the television camera, the light sources 19, 20, 2 housed in the light source section 17
It is desirable that the television cameras 1 and 22 also move together, and in this case, the light shielding plate 18 may also move together.

Furthermore, although FIG. 1 is an explanatory diagram of the case where transmitted light is used, it is not necessarily necessary to use transmitted light, and reflected light may also be used. To utilize the reflected light, for example, the surface on which the original film is placed on the original film holding plate may be made white or other color, and the light source section should naturally be located at the position for the reflected light source.

In the present invention, the registration is confirmed on the monitor TV screen, but Y is a color that is difficult to see.
BL erases other colors, so it is not a desirable color for checking registration. To solve this problem, it is preferable to provide an adjustment volume so that each hue and density can be changed independently.

In the present invention, it is preferable to provide a switch so that either a positive type film or a negative type original film can be used, so that either type of original film can be used for inspection. The details of this switching are already known and will not be discussed further here. It is also possible to switch between continuous tone separation film and halftone separation film as the original film, and such technology is already well known. Therefore, I will not explain it further.

As described above, the present invention simplifies registration confirmation.
This speeds up the process and improves the efficiency and accuracy of film inspection.The improved registration accuracy also improves the efficiency of proof printing and reduces the number of reprints due to registration errors during proofing, resulting in material cost savings. be able to.

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

Further, according to the device of the present invention, the photographed area is pointed at when checking the register, so that the efficiency of the work can be improved.

Furthermore, conventionally, the registration of the original film was left to the retoucher, so there were constant problems with registration errors during proof printing and final printing, but with the present invention, rapid plate inspection is possible with inexpensive equipment.
Troubles caused by poor registration are drastically reduced, and it is also highly effective in interlacing flat screens and checking for duplicates of letters, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the film inspection device of the present invention, FIG. 2 is an explanatory diagram of an example of an original film holding plate in the device of the present invention, and FIGS. 3 and 4 are diagrams of the present invention. FIG. 2 is a schematic cross-sectional view and a plan view of a photographed portion display device of a film inspection device; FIG. 1...Original film holding plate, 2, 3, 4, 5...
...Original film, 6...Bakyum hole, 7, 8,
9, 10...TV camera, 7', 8', 9', 1
0... Zoom lens, 11... Electric signal processing device, 12... Adjuster, 13... Matrix, 1
4... Monitor TV, 15, 16... Frame, 17
...Light source section, 18... Light shielding plate, 19, 20, 2
1, 22...Light source, 23...Low magnification lens, 24
... High magnification lens, 25 ... Light source, 26 ... Lens base, 27 ... Television camera body, 28 ... Television camera base, 29 ... Mirror, 30 ... Support for mirror adjustment, 31 ... Ray, 32...switch.

Claims (1)

[Claims] 1. An original film holding plate for holding a plurality of original films for printing, a plurality of television cameras for taking images of each original film held on the holding plate, and the plurality of television cameras. an electrical signal processing device for displaying electrical signals from the original film in a composite manner on a monitor television in correspondence with each color of the original film; and an image of each original film is displayed based on the electrical signals processed by the electrical signal processing device. 1. A film plate inspection device comprising: a monitor television for displaying images; and a photographed portion display device for displaying the portion photographed by the television camera.