JPS5870227A - Film checking device - Google Patents

Abstract

PURPOSE:To make the confirmation of estimate easy and quick, by using television cameras and confirming the estimate of respective colors of negative films on a basis of pictures superposed on a color monitor TV. CONSTITUTION:Pictures of negative films 2-5 on a negative film holding plate are photographed by TV cameras 7-10, and picture signals Y, M, C, and BL are inputted to an electric signal processing device 1. After white and black levels are adjusted by an adjuster, conversion to three primary colors R, G, and B is performed by a matrix 13. Three primary color signals are inputted to a monitor TV 14, and pictures of respective color negative films 2-5 are synthesized and displayed with colors. Thus, the estimate of respective colors of pictures of 4-color negative films 2-5 is confirmed easily and quickly.

Description

[Detailed Description of the Invention] Conventionally, when creating a printing plate, a film of color separation from an original is pasted onto a single transparent film for each color. It is well known that each color of film should be pasted on a transparent film according to a predetermined layout and used as the original film. In this case, it is necessary to check whether the images on the pasted color separation film match each color in register. For example, in the case of four colors: yellow, red, eye, and dark, one way to check this is to use one of these as a reference, and then superimpose the original film of the other one on top of it. A method is known in which the register is confirmed and the remaining plates are similarly placed on top of the reference plate to check the registers.

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

For example, in the case of the four colors of yellow, red, eye, and dark, 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, since the reference master version and other original films are in a positive negative state, it is easy to check the registration, 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 check whether or not the registration of the original film is correct between each color. It is something to do.

That is, according to the apparatus of the present invention, it is possible to use a television camera to check whether or not the registration between each color is correct by checking images superimposed on a color monitor television.

According to the present invention, register confirmation can be performed extremely easily,
Great results can also be achieved in checking for duplication of letters, etc., by matching with flat mesh.

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 (split), M (red), C (eye), Bl, and (tint). An example is shown below.

In the 1st M, Y is placed on the original film holding plate (1).
, M, C, -BL corresponding original film (2), (3
), (4), and (5) are placed. In this case, these original films must be placed at predetermined positions on the holding plate (11). It is only necessary to select and use an appropriate method to match this, and the method to be adopted is not particularly limited.The original film placed on the original film holding plate (1) Since the original film may curl and not necessarily be flat, and the original film may shift position during operation, it is natural to take measures to prevent this.

Any appropriate means can be adopted to prevent curling or positional displacement. For example, as shown in Figure 2, which explains an example of the original film holding plate (1), a vacuum hole (6) is opened in the original film holding plate (+1), and after placing the original film, the vacuum hole (16) is opened. Evacuation may be performed using a vacuum pump (not shown). In this case, the shape, position, etc. of the vacuum hole (6) are not particularly limited, as long as they can hold the original film well.

Another method may be to place the original film on the original film holding plate and then cover the original film with a transparent sheet-like material such as a transparent film or transparent glass. However, since there are cases where it is necessary to use a very high magnification (for example, about 60 to 80 times) when photographing with a television camera, which will be described later, it is preferable to use a vacuum method as the original film holding method.

The method of placing the original film 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 may be used, such as the method of arranging them in a square shape. Since there is no limit to the method, the method that is easiest to use can be selected as needed, and adjustments can be made in advance to avoid image shifts due to differences 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 at predetermined positions and the electrical signals from each TV camera are combined to display the image on the monitor TV, so the relative W position between each TV camera is If this changes, it is also necessary to change the position where the original film is placed accordingly. Or, 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.

These TV cameras (7), (8), (91, (10)
) by original film (2), (3), (4), (5)
images are taken, but the TV cameras (7), (8), (
The zoom lens (71, (
81, (91, and (101) 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 that has passed through the zoom lens (7f, (8)', (9)', (field') and has been enlarged to the desired size is transmitted to the television camera (7), (8), (9)
, (10) is converted into an electrical signal by a photoelectric conversion element provided therein. 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. Image signal Y converted into an electrical signal! J, C1
BL is input to an electrical signal processing device (old). The electrical signal processing device 011 includes an adjuster (
121 and the white and black levels are adjusted, the matrix (13) is entered, where the amplification and synchronization of each of the Y, M, C, and Bx signals and the Y, M, C, and BL signals are performed. Processing such as conversion from the signal to the three primary colors of television, R (G), G@, and B@, is performed.

The signals converted to 1G and H are input to the monitor TV (14), and the original film images of each color are displayed in color on the monitor TV screen.

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

In this way, the original printing film is in the correct register, making it easier to inspect the printing plate, but on the other hand, when the magnification is high, the entire original film cannot be displayed on the monitor television.

For this reason, when the magnification is high, it becomes difficult to distinguish 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. FIG. 3 is a cross-sectional explanatory diagram of an outline of a photographed part display device that displays a photographed part;
FIG. 4 is an explanatory 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 +231, high magnification lens (241, Light I
'251 is attached to the lens base (26). The TV camera body (the main unit) is attached to two TV camera bases, and the lens base (26) and TV camera base (28) can be moved laterally relative to each other. This makes it possible to switch between the low magnification lens 12.1 and the high magnification lens 124).

A mirror is further attached to the lens base (26), and the angle and other aspects of the mirror c29) can be adjusted using a mirror adjustment support 00).

The light ray Gυ emitted from the light source (251) is reflected by mirror 4 and reaches the original film to be photographed.

In this case, the ray (31) reflected by the mirror (291)
) reaches the area being photographed by the television camera and adjusts the position of the mirror using a mirror adjustment support (3CM) so that the television camera spots that area.

By doing this, it is possible to easily VC identify that the portion where the light beam (31) is spotted is the portion actually photographed by the television camera. Note that the light source (25) is preferably a powerful light source so as to be able to show a small spot portion, and it is preferable to use a laser device or the like.

Note that it is also possible to always spot the photographed area using the light beam 1; l), but since it is difficult to identify the photographed area at high magnification, it is possible to spot the photographed area only at high magnification. Turn on the light source by the switch, as if
It may also be possible to switch between clarification and clarification. As shown in FIG. 6, the changeover switch is, for example, provided with a switch (32Y) on either the lens base (26) or the television camera base (28), and
When using the high magnification lens (241'a'), the switch is automatically connected and the light source turns on by the relative movement of the TV camera base (28) and the television camera base (28). This will also improve work efficiency.

In the case of Fig. 3, the light source (251 is the lens base (,!l
i), and the spot position of the light beam Oυ is adjusted by means of a mirror (2).

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.

The above-mentioned sweeper 4z partial display device may be attached to each television camera, but in the case where the position of the mirror is adjusted so that the portion being photographed by the television camera is As I have mainly explained, the light beam itself will also be photographed by a television camera on this platform.

Therefore, if it is necessary to avoid such a situation, the following can be done.

In other words, it is possible to adopt a method of attaching a filter to the lens to cut the reflected light of the spot light beam. Alternatively, the position of the mirror may be adjusted so that the spot of the light beam is near the area being photographed by the television camera, thereby allowing the viewer 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.

In addition, when inspecting halftone dots, it is desirable to enlarge the image 20 times or more, but in such a case, the entire image cannot be displayed because the image is too large. In order to solve this problem, the tail should be able to move in the Y direction I11' relative to the original film holding plate m'iχ. That is, as shown in Fig. 2, the original film holding plate is attached to the frame (15) so that it can slide in a certain direction (for example, the Any other appropriate means, such as a structure in which it is slidably attached in a direction perpendicular to the direction (Y direction), can be adopted as desired.

Also, do not move the original film holding plate (IIYX, Y direction), TV camera (7), (8), (9), (10
) may be made to be able to move together in the X and Y directions without changing the relative positional relationship between the television cameras. The television camera can be moved 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; for example, the drafter (product name)
Any method may be used as appropriate, such as a method adopted in a universal drawing instrument such as the following.

'By making the original film holding plate and/or the television camera movable in this manner, the register of the four colors at any arbitrary position can be instantly confirmed even at high magnification.

In Fig. 1, the light source part αl is located on the opposite side of the original film from the TV camera, and the light from the light source part (+71) is transmitted to the original film (2), (3), (4), +51.
ya' passing through TV cameras (7) and (8) respectively.
, (9), (101) In this case, when the magnification is large and a portion is photographed, it is sufficient that the light is effective in that portion, and the light is applied to the redundant portion. In order to prevent the monitor from becoming difficult to view due to the irradiation and scattering of the light, it is desirable to provide a light shielding plate (18) that leaves only the necessary portions and blocks the rest.

Note that when moving the TV camera, the light source section (1
The light source housed in the force (19, (20), (2D1(
It is desirable that 2Z also move together with the TV camera.
In this case, the light shielding plate (18) may also be moved together.

Also, although Figure 1 is an explanatory diagram of the case where transmitted light is used, it is not necessarily necessary to use transmitted light (though reflected light may also be used. ,
For example, if the original film mounting surface of the original film holding plate is made white or other color, the position of the light source section (of course, the neck should also be the position for the reflective light source).

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

In the present invention, it is possible to use either a negative type film or a negative type film as the original film by providing a switch so that either type of original film can be used for inspection. Preferably, the details of this switching are already known and will not be described further here.

It is also possible to switch between continuous-tone separation film and halftone separation film to be used as the original film.
Since such techniques are already well known, they will not be described further.

As described above, the present invention simplifies and speeds up register confirmation, improves the efficiency and accuracy of film inspection, improves the efficiency of proof printing, and improves the efficiency of proof printing by improving register accuracy. Since the number of reprints due to misregistration is reduced, material costs can also be reduced by IVi'1.

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

Furthermore, according to the apparatus of the present invention, since the photographed part is shown by taking a photo during indoor confirmation, the efficiency of the work can be improved for "2000 seconds", so it is possible to avoid μ errors in proof printing and final printing. However, according to the present invention, it is now possible to quickly inspect the plate using an inexpensive device, which reduces the number of problems caused by defects by 11, and reduces the number of problems caused by defects by 11.
Is it great for matching and checking for duplicates in characters?
show.

[Brief explanation of the drawing]

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. 6 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 +21, +31, (4
1, +51...Original film (6)...Vacuum hole (7), +81, +91, (10)...TV camera (7r, +81, +9(, (10)...
Zoom lens, old)... Electrical signal processing device (W (12)
...Adjuster (131)...Matrix (14)...Monitor TV (151)
, (16)...Frame 1″17)...i#:, Ryo
Part (18)... Light shielding plate (19),
(20), (21), +22)...light
...Low magnification lens (24)...High magnification lens 1
5)...-ffi Source (26+... Lens base patent applicant Toppan Printing Co., Ltd. Representative O.O. Suzuki (1 other person)

Claims (1)

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