JPS58142341A - Device for detecting film - Google Patents

Abstract

PURPOSE:To prevent a shift of registration due to the changeover of lenses, by controlling the deflecting action of a television camera. CONSTITUTION:The deflection of an image pickup tube 20 in a television camera 7 is controlled by a horizontal deflection coil 21 and a vertical deflection coil 22. Horizontal amplitude regulators 23, 25 and horizontal centering regulators 24, 26 are provided for lenses A, B, and in accordance with the changeover of the lenses, the regulators are changed over to those for the selected lens using switches 27, 28. Each of the regulators is regulated beforehand every lens. Outputs from one of the regulators 23, 25 and one of the regulators 24, 26 are amplified by an amplifier 29 and inputted in the coil 21. Deflection in the vertical direction is controlled in the same manner as deflection in the horizontal direction. The control is applied to television cameras Y, M, C, BL. Ununiformity in the focal lengths of lenses and the gradients of the optical axes can be corrected.

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 one transparent film. It is well known that a transparent film for each color is laminated according to 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. Here's how to check this kind of thing.

For example, in the case of four colors: yellow, red, eye, and dark.

Using one of these plates as a reference, check the registration by overlaying the original film of the other one on top of it, and confirm the registration by overlaying the other plates in the same manner on top of the standard plate. There are known ways to do this.

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 positive or negative.

One way to remove these defects is 1. For example, in the case of four colors: yellow, red, eye, and dark, one of the original films is used to create a film with a reversed image, and that film is 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, the reference master version and other original films are in a positive-negative relationship.

Although checking registration is simple, the additional film required to make the master version introduces additional cost and time inconveniences.

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 photograph the 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 the color monitor very easily and reliably. You can.

In addition, by switching the lens and setting the magnification to low, it is possible to easily check for cross-overs with flat mesh, duplicate 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, in which Y(, [, M (red), C (eye), BL (black)
An example of typical color printing using four colors is shown.

In Figure 1, the original film holding plate (11 upper KY
, M, C%BL original film (2), (3)
, (4), and (5) are placed. These original films (21f31 (41 (51) are placed at predetermined positions on the original film holding plate (1) by an appropriate method of the prior art such as a method using a punch system, and The original film (21(3)
1 (41 (51) may be curled or misaligned during operation, so it is natural to prevent this by using appropriate methods of the prior art, such as using a vacuum adsorption method. That's true.

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 such as arranging them in a square shape may be used. There are no restrictions on how they can be arranged, so you can choose the method that is easiest to use depending on your needs.

In the apparatus of the present invention, the original film r2i (3> (41 (51)
TV camera (71 (81 (91Qυ)
are each original film +21 (31f41 (located at a predetermined position corresponding to 51, and the camera mounting base Q4) along the one-piece camera mounting base θ shown in FIG. In order to be able to take enlarged shots of the entire area,
It has a structure that allows it to move parallel to the holding surface of the original film holding plate (1).

In the apparatus of the present invention, in order to improve the plate inspection ability, each television camera is equipped with two types of lenses with different magnifications (7
Lenses such as 5f (9A (lσ) and (7 (87) (9'r (Iσ)) are mounted on a lens mounting base ( 151
It has a structure that allows you to switch and change the imaging magnification depending on the purpose.

Original film illuminated by illumination light source (6) +21
The optical image of f3)(41(51) is
Q (j or lens (7 pieces) (with the desired size from f97Q (lfK), TV camera (71 (81 (91 (10)
The image is formed on the tube surface of the image pickup tube built into the camera and converted into an electrical signal.

The image signals Y, M, C, and BL converted into electrical signals undergo various signal processing in a signal processing circuit (111) and are input to the matrix circuit α2.

M) IJ socks path (in 121, image signals Y, M, C
.

Processing such as mixing and amplifying BL and converting the signal into R (red), G (green), and B (blue), which are the three primary color signals of a color television, is performed. The signal processing circuit Qll and the matrix circuit α2 form an electrical signal processing device.

The image signals converted into R, G, and B are input to a color monitor, 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 there is a misregistration 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, making it extremely easy to check whether the registration is correct or not. .

On the other hand, at high magnification, only a narrow area of the original film can be displayed on the color monitor, so it is not suitable for checking the combination with a flat screen or duplication of characters etc. For such applications, the lens By switching to a lower magnification and displaying a wide range of the original film on a color monitor, it is extremely easy to judge whether it is good or bad in an instant.

In this way, it is possible to judge the quality of the original film, but due to the manufacturing process, each lens has variations in focal length and optical axis tilt, and there are also variations in the mounting base. There is an error.

For this reason, even if the registration of the TV camera (71 (81 (91) Ql is perfectly aligned using the lens ff7 (m (95
(97(1) If you switch to the f 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 one image frame that occur when the lenses are changed. In other words, the deviation of the optical image caused by switching lenses is corrected by the deflection circuit of the image pickup tube.The amount of correction required when switching lenses is preset, and this preset is linked to the switching of lenses. By operating the lens, 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 the focal lengths of the lenses, and image frame position deviations caused by optical axis inclinations. Therefore, to electrically correct these, four items are sufficient: vertical deflection amplitude, horizontal deflection amplitude, and vertical deflection centering = horizontal deflection centering. are provided exclusively for each lens, and by switching these adjusters in conjunction with lens switching, it is possible to maintain good registration.

A block diagram of the deflection circuit that made this possible is shown.

The horizontal and vertical deflections of the image pickup tube in the Y-version television camera (7) are controlled by a horizontal deflection coil (2+1) and a vertical deflection coil (221), respectively.

Horizontal deflection is controlled as follows. First, each lens is equipped with a horizontal amplitude adjuster that adjusts the horizontal amplitude and a horizontal centering adjuster that adjusts the horizontal centering. A horizontal amplitude adjuster (Q width) and a horizontal centering adjuster (241) are shown, and for the lens (7r), a horizontal amplitude adjuster (251) and a horizontal centering adjuster (26) are shown.

Each of these adjusters can be switched to the one for each lens according to the switching of the lens using the switch @ (281). Make adjustments (presets) in advance.

The output from the horizontal amplitude adjuster and horizontal centering adjuster for each lens is selected by the switch to either the output for lens (71) or the output for lens (7). It is input to the amplification device wire and the amplification device (a)
After being amplified in width, the signal is input to the horizontal deflection coil Ca1l.

Vertical deflection is controlled similarly to horizontal deflection. In other words, a vertical amplitude adjuster for adjusting the amplitude in the vertical direction and a vertical centering adjuster for adjusting the centering in the vertical direction are provided for each lens. Indicated by vertical amplitude adjuster (to) and vertical centering adjuster 0υ,
For lenses (7D), the vertical amplitude adjuster 0 position and the vertical centering adjuster (33) are shown.

Each of these adjusters must be adjusted in advance so that it is in the optimal condition for each lens, and the output from each of these adjusters can be adjusted to Either the output of the lens (7〒) or the output for the lens (7
After being amplified by , it is input to the vertical deflection coil (221) in the same way as in the case of horizontal deflection control.

The switch @ (to) C341G51 connects to each adjuster for all lenses (71 when lens (71) is used, and connects to each adjuster for all lenses (7'l) when lens (77) is used. It is supposed to connect.

The switch (27) (2υC'141 C3!j is designed to be switched in conjunction with the switching of the lens, and this switching can be performed as follows. In other words, the switch is turned on in conjunction with the switching of the lens. The switching relay (TO) operates, and the switch (2B (28) C341C351) is switched by the signal from this switching relay (TO).

A switch ON that is linked to lens switching can be attached to the camera mounting base Q4) as shown in FIG. To change the lens, by moving the lens mounting base (151), the lens mounting base 09 presses the switch 0η attached to the camera mounting base 0, and the switch is changed 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.

The camera and camera mounting base are mounted on an X-axis drive mount (40K), and the X-axis drive mount 0Q is equipped with an X-axis seal (41K).
) is a trap so that it can be slid in the X direction.

The X-axis seal (4υ stands tall so that it can slide in the Y direction on the Y-axis seal attached to the X-axis drive stand (42), and the original film holding plate (11 is supported by the frame (44) ing.

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 taken by each television camera are converted into electrical signals, processed by an electrical signal processing device, and sent to a color monitor.
3) Display the composite image.

A black-and-white monitor (451 is used to adjust the position of images from each television camera, etc.) A black-and-white monitor has a higher resolution than a color monitor, so it can be adjusted with higher precision.Oscilloscope (4f19 is used to adjust the position of each image) It is used to view the waveform and reproduction curve of electrical signals.

The operation panel (47) allows you to select whether to display the signal as positive or negative, adjust the gradation, such as correcting the middle tone, correcting the gradation of brightness and shadows, adjusting the white level, adjusting the black level, etc. It is used for operations, and is particularly effective for checking not only the register of the original film but also the color tone of the color separation film.

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

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 defects in proofs and final printing.However, with the present invention, it is possible to quickly inspect the plate using an inexpensive device, which eliminates registration defects. In addition to drastically reducing the number of troubles caused by this method, it is also highly effective in checking for duplication 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.

Further, 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 the drawing]

FIG. 1 is a schematic explanatory diagram of the film inspection device of the present invention, and FIG.
The figure is an explanatory diagram of the mounting state of the lens and television camera of the apparatus of the present invention, Figure 6 is a block diagram of a deflection circuit that controls the deflection of the image pickup tube of the television camera for Y-plates, and Figure 4 is a diagram of the apparatus of the present invention. An explanatory view of the overall appearance of the device is shown. (11...Original film holding plate (2) to (5)...
・Original film (6)...Illumination light source (7) ~a1
...TV camera (No~(1)...Lens (7)
De~0σ...Lens a...Signal processing circuit Q2+...
...Matrix circuit αJ...Color monitor 04
)...Camera mounting base Q9...Lens mounting base
Han... Image tube (21)... Horizontal deflection coil (2
21...Vertical deflection coil c! u...Horizontal amplitude adjuster (24@...Water rate centering adjuster (2η(2
81C3410! j Cm...Switch Q9 (support)
)...Amplifier C (ilI C3 needle...Vertical amplitude adjuster 0υ關...Vertical center, tari, g adjuster (4■...
X-axis drive stand (41)...X-axis seal (42)...
・Y-axis drive stand (43...Y-axis seal (4(...
・Frame (4!51...Black and white monitor (46)...
・Oscilloscope (4D°゛. Operation panel patent applicant

Claims (1)

[Claims] (11) It has an original film holding plate for holding a plurality of sheets of printing original film, and a mechanism for switching between at least two types of photographic lenses for photographing images of each original film held on the holding plate. a plurality of television cameras; 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; The camera has a color monitor that displays electrical signals, and operates in conjunction with a switching mechanism that switches the photographing lenses of the plurality of television cameras. A film inspection device characterized in that it controls.