JPS61215550A - Inspecting device for film plate - Google Patents

Abstract

PURPOSE:To project an image similar to an image obtained by actual manual swinging and tilting by switching and connecting the electric signal of one camera periodically and alternately with a artificial image signal corresponding to the video signal on white paper. CONSTITUTION:When a switch 104 is connected fixedly to a terminal 106 and a switch 105 is switched and connected to terminals 108 and 109 periodically and alternately, the image of a camera 33 is projected while superposing said image intermittently upon a camera 32. When the switch 105 is connected fixedly to a terminal 109 and the switch 104 is connected to terminals 106 and 107 periodically and alternately, the image of the camera 33 is projected while superposing said image intermittently on the image of the camera 32. When both switches 104 and 105 are operated periodically and associatively, the images of the cameras 32 and 33 are projected alternately on a monitor television 11 to inspect swinging and tilting operation.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is concerned with checking whether color separation films of each color, plain mesh, characters, etc. are arranged at predetermined positions and as specified in an original film for color printing. This relates to a film inspection device that confirms.

(Prior art) Conventionally, when creating a master film for a four-color printing plate, a pattern original is color-separated into film, or various materials such as plain mesh, letters, etc. are pasted onto several sheets of transparent film for each color. It is well known that the unexposed film is overlaid with a light-shielding mask film, exposed to light several times, and developed, thereby creating an original film of four colors: yellow, magenta, cyan, and black.

In this case, before creating a printing plate, check whether the image of the color separation film is registered between each color on each master film, and whether the plain halftones or characters are placed in the specified position of each color as specified. It is necessary to check whether it is done or not.

Furthermore, if a mistake is discovered in the original film, or if there is a change in designation, the original film is called an old version if it cannot be corrected by partial correction of the original film.

In order to make corrections, we made corrections such as replacing the various materials that were first pasted on several sheets of transparent film, layered them with a light-shielding mask film, etc., and exposed the unexposed film several times.
Develop and create an original film. This original film is called a new version, and in this way mistakes in the old version are corrected or modifications such as designations are made.

In this case, since the process of creating the original film is manual and complex, it is possible for mistakes to be made or even areas other than the specified changes to be corrected by mistake, and these cases often result in extremely large losses. Therefore, it is necessary to check whether the modifications were made as specified.

One method for such 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.

As a method to eliminate such drawbacks, for example, using a film inspection device such as FC-600 (product name) related to the same applicant, four sheets of original film are exposed to four predetermined television cameras. At the same time, images are taken simultaneously and displayed on a television monitor as a composite image that approximates the printed matter. Check whether the color separation film image is in the correct register between each color on each original film, and specify whether the halftone dots or letters are placed in a predetermined position for each color. There is a well-known method for instantly checking whether or not a vehicle is located on a street. In this case, yellow, magenta, cyan, and black 4
Since the original film of the plate is placed on the original film holding plate on the same plane, a large space is required to install the device. 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.

A low-cost method that eliminates the shortcomings or limitations of such conventional methods and confirms whether color separation films of each color, plain mesh, characters, etc. are arranged at predetermined positions and as specified on the original film. There was a desire for a new, more compact device.

That is, the apparatus according to the embodiment of the present invention uses two television cameras to simultaneously photograph two original films, and converts the video signals of each television camera into yellow, magenta, cyan, black, black, and black, respectively. The image of the color separation film on the original film is checked by selecting and specifying one color from blue, green, and red one by one using the changeover switch of the color selection circuit and displaying the synthesized image on the monitor TV. The film inspection device used to check whether the dots, letters, etc. are placed in the designated positions for each color as specified has been renovated.

Incidentally, instead of the plurality of television cameras in the film inspection device as described above, a single television camera and a storage device capable of storing a plurality of images are provided, and images of a plurality of original 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 renovated film plate inspection devices such as those mentioned above could not perform such tilt inspection work, so such inspections had to be done manually.However, the present invention enables such work to be performed using a film plate inspection device. (Specific Means for Solving the OC Problem) The present invention will be described in more detail below with reference to the drawings.

The specific example below is the newly renovated 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 (10
1) becomes the output (111), and the input (102) becomes the output (11).
The case where there is a short circuit in 1) will be explained.

As shown in Figures 1 and 2 (2 cameras 02 (to))
And the camera mounting base (not shown) is an X-axis drive stand (11
The X-axis drive frame (11) can slide on the X-axis seal (2) in the X direction.

The X-axis seal (21) is mounted on the Y-axis drive pedestal (3), and the Y-axis drive pedestal (3) is attached to the X-axis seal (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 are fixed by the pin system (7) on the original film holding plate (5) at the desired position. Two versions of the original films (8) and (9) can be photographed.Also, in a television camera, the magnification can be changed by switching between several types of lenses with different magnifications, and in this example, two lenses each have different magnifications. I have a lens.

A light source section is provided on the opposite side of the original film (8), (91) from the television camera, and light from the light source section passes through the original film and enters the television camera.

The images of each original film f81 (91) photographed by each television camera 02 (g) are converted into electrical signals, processed by an electrical signal processing device, and compositely displayed on a color monitor (11).

The operation panel (20) selects which color to display the video signal from each TV camera among yellow, magenta, cyan, black, blue, green, and red.
It is used to select whether to display the signal as positive or negative, adjust the white level, adjust the black level, etc. It is used not only to check the register of the original film, but also to specify whether it is a flat screen or text. It works particularly effectively for confirmation.

As shown in Fig. 2, video signals from each TV camera are selected and displayed one color at a time from among yellow, magenta, cyan, black, blue, green, and red using a selector switch for each TV camera and displayed on the monitor TV. The configuration of is explained.

Original film (8) illuminated by light source ■, r31)
, (9) are converted into electrical signals by the television camera C33 corresponding to each original film, and the photoelectric conversion element (g). The image signal converted into an electrical signal passes through a process (not shown) that adjusts the black and white level.
After the waveform is shaped by the color selection circuit (4G), it is applied to the matrix C31. It consists of a large number of changeover switches for inputting to a matrix device for composite display on a monitor TV as colors such as , dark, blue (magenta, cyan), clean (yellow, cyan), and red (yellow, magenta). In addition, since the two television cameras are synchronized by the synchronization signal from the synchronization signal generation circuit (351), images that are in phase are output from each camera. The blanking signal generated by the circuit C351 is also in phase with the image signal.

Therefore, the level of the blanking signal generated by the synchronization signal generation circuit C35+ is adjusted to be the same as the white level adjusted by the black and white level adjuster, and this is converted into the pseudo image signal 13η.
This pseudo image signal, which is a white image signal, is also applied to the matrix 0 through the color selection circuit (4G changeover switch) for inputting it to the matrix device.

That is, the color selection circuit decoy receives the image signals from the two television cameras and the pseudo image signal 0'rI which is the white image signal.
It is equipped with a large number of switches that are selectively connected to arbitrary inputs (4υ) of yellow, magenta, cyan, and black of the matrix C31 (43 (43) (44)).

Matrix 09 is a key (41
), magenta (41, cyan (43), and black (4a)) The four-color input image signals are mixed and amplified, converted into three color signals of blue (45), green (460, and red (47)) and output to the monitor TV ( lυ to display a color composite image.For example, in the color selection circuit (41), the camera G
Switch the video signal of 4 to Ki (4υ), the video signal of the camera (G) to magenta (42), and the false image signal (37i adjusted to the same level as the white level) to cyan (43 Sumi) so that it is input to C4. If you have done this, the color monitor TV (
11), a composite image is displayed in which the image of the camera country is yellow and the image of the camera country is magenta. In addition, the color selection circuit (4
0(), the video signal of camera C2 (4υ) and magenta (42), the video signal of camera (G) is
When the pseudo image signal L37) is switched to cyan (43), the color monitor TV 0υ displays a composite image in which the image from camera C! is red and the image from camera Q is black.

As described above, with this newly renovated film inspection device, it is possible to select and display the color monitor image of the original film from among yellow, magenta, cyan, black, blue, green, and red. Yes, on the other hand, when performing specified inspections for registration, plain mesh, or text, an example of standard color printing using four colors: yellow, magenta, cyan, and black is required. I will explain about it.

Place the original film magenta plate on the register pins (7) of the film holding plate (5), and place the original film magenta plate on the pins (7).
When you select the left camera color selection button 〃Y〃 or 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 will be displayed on the color TV monitor (11). It is possible to easily and instantaneously check the registration, and confirm the color of the plain mesh or characters. Next, remove the original film cyan version and the original film cyan version.
7) Place the original film black plate on the pin (71), and press the left camera color selection button 〃C〃 and the right camera color selection button tt [3K tt] on the operation panel to display cyan and black on the color TV monitor. Displayed as a two-color composite image, it is possible to easily and instantaneously check the registration and the color separation of plain mesh or characters. 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., the camera used to image the green version of the original film should be Color selection button // Y tt I/ Ct
By pressing t at the same time, a green image corresponding to the original film green plate can be displayed on the color monitor television, making plate inspection easier and instantaneous compared to conventional plate inspection.

On the other hand, the old version before reprinting and the new version after reprinting and correction of the original film containing the error or the original film with correction instructions are placed on the pins (7) of the film holding plate, and the Panel color selection button right camera l
/ C //, left camera // By pressing M tt, the areas that cannot be corrected, the areas where mistakes have been corrected or have been corrected, and the areas where corrections were made by mistake that do not need to be corrected will be highlighted in blue. Since the image is displayed on a color monitor television in three colors: , cyan, and magenta, it is convenient because a portion that has been corrected from a distance can be easily and reliably found instantaneously.

Next, a case will be described in which a tilt mechanism (100), which is the subject of the present invention, is inserted before the color selection circuit (4Q) and the tilt mechanism is operated.

This tilting mechanism (100) has a small tilt mechanism (100) that can be used to control the tilting mechanism (100) by periodically and alternately switching and connecting the electric signal from one camera to the pseudo image signal Oη corresponding to the video signal of the white paper. Display a similar image on your monitor TV (
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 the switch (104) is fixedly connected to the terminal (106), and the switch (1 (5) is connected to the terminal (108), (109)
), the monitor TV (11) will display the camera (c) for the image from camera 02.
The images appear to overlap or disappear. If the switch 0o5) is fixedly connected to the terminal (109) side, and the switch 004) is connected periodically to the terminals (106) and (107) FC, the image of the camera C37J will overlap with the image of the camera (G). It appears and disappears. In addition, when both switches (104) and (105) are linked and operated periodically, the camera (34) can be connected to the monitor TV (11).
Images (c) and (c) can be displayed alternately, which makes it possible to inspect tilt.

Of course, the color of the image from each camera can be appropriately selected by the color selection circuit (41). These operations are performed using the left camera button for tilt on the operation panel.
It is configured to be activated by simultaneously inserting //, tilt right camera button // A R //, or left and right tilt buttons A L "AR".

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, this 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. fil-X-axis drive stand (2)-X-axis seal (3)-
Y-axis drive stand (4) - Y-axis seal (5) - Original film holding plate (6) - Frame (7) (7 Reapin (8)
1 (9) - Original film (11) - Power monitor TV (12) - Monitor TV mounting stand (20) - Operation panel 31) - Illumination light source G
3 (c) - TV camera (b) - Electrical signal processing device (to) - Synchronization signal generation circuit - Synchronization signal C3
'O-Pseudo image signal (to) -Process C3! J
- Matrix (4 [- Color selection circuit (4I) ~ (
44) - Matrix input (ki, magenta, cyan, dark) signal (49 to (47) - Matrix output (blue, green, red) signal (1ω) - Tilt mechanism

Claims (1)

[Claims] 1) A mechanism for photographing a plurality of original films and outputting electrical signals of the plurality of images, an electrical signal processing device for displaying the electrical signals of the plurality of images in a composite manner on a monitor television, and this electrical signal processing device. A film inspection device comprising a monitor television for displaying images of the plurality of original films in a composite manner based on electrical signals processed by the original film includes a mechanism for generating a pseudo image signal that is a white image, and a mechanism for generating a pseudo image signal as a white image; A film inspection device characterized by comprising a tilting mechanism capable of periodically and alternately switching and connecting at least one of the electrical signals of the film to the pseudo image signal.