JPS6280659A - Negative examining device for transmission and reflection - Google Patents

Abstract

PURPOSE:To photograph an original film to be examined in case of transmission as well as reflection by providing light sources under original bases and in a moving base of a camera. CONSTITUTION:Light diffusing plates are arranged under transparent glass plates to constitute two film bases 10 and 12 on which negative films 2 and 4 are placed, and light sources 16 and 18 which illuminate transmission type negative films 2 and 4 and are connected to DC stabilized power sources are arranged under these bases 10 and 12. Light sources 70 and 72 which illuminate reflection type negative films 2 and 4 are attached to a base 50 and illuminate refection type negative films 2 and 4 through mirrors 74 and 76. Upper light sources 70 and 72 are selected and lit in case of reflection type, and lower light sources 16 and 18 are selected and lit in case of transmission type. Since two switches 6 and 8 can be switched to transmission type and reflection type in right and left parts independently of each other, negative films are examined even if the reflection type negative film and the transmission type negative film are placed on bases 10 and 12 respectively.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a plate inspection device for checking whether or not the designs or characters of each color original film of color printing are arranged at predetermined positions as specified. It's about.

(Prior art) Conventionally, multiple original films for the same printed matter are photographed using multiple TV cameras, and the images are superimposed and projected on a TV monitor. Plate inspection devices for checking whether characters, etc. are placed at predetermined positions as specified are disclosed in, for example, Japanese Patent Laid-Open Nos. 58-70227 and 1982-70228 (all 4) filed by the same applicant. Color Inspection Machine>, known in Japanese Patent Application No. 60-57178, Japanese Patent Application No. 60-57179, Japanese Patent Application No. 60-57180, and Japanese Patent Application No. 60-57181 (the above two-color plate inspection machine) .

(Problems with the Prior Art) By the way, such conventional plate inspection devices can only inspect transparent original film, and can only inspect reflective inspection originals (hereinafter simply referred to as original plates) such as block copies, proofs, eye prints, etc. Film cannot be inspected. However, there are various stages in the printing plate-making process where the linear pressure can be maintained for 8 days, and plate inspection is therefore necessary at various stages. There was a need to be able to inspect original films such as eye-printed films.However, such inspection was not possible with conventional inspection equipment.

(Problems to be Solved by the Invention) The present invention attempts to solve the above-mentioned drawbacks of the prior art, and makes it possible to inspect not only transparent originals but also reflective originals as an original film. Another object of the present invention is to provide a transmissive and reflective plate inspection device capable of inspecting original film such as proof printing and eye printing.

(Means for solving the problem) Therefore, in the present invention, a plurality of original films are
By capturing images with a camera and displaying multiple images superimposed on a TV monitor, it is possible to check whether the designs or characters on the original film for each color of color printing are placed in the specified positions as specified. A light source is installed on both the bottom of the document holder and the camera's movable holder in plate inspection equipment.
This allows the original film to be inspected to be imaged both in transmission and reflection, thereby making it a plate inspection device that can be used for both transmission and reflection.

(Example) The present invention will be explained in detail below with reference to the drawings.

In explaining this kind of inspection'! Since the details of the arrangement are explained in detail in the above-mentioned patent publication, etc., a detailed explanation thereof will be omitted.

The following embodiment describes an example of a two-color plate inspection device.

As shown in detail in FIG. 1, the two film stands 10 and 12 on which the original film 2.4 is placed are made up of a light diffusing plate placed under a transparent glass plate, and further below that is a transparent glass plate. A light source 16.18 connected to a DC stabilized power supply is arranged for illuminating the original film 2.4.

A camera movable frame 50 to which two TV cameras 30, 32 are attached is arranged above the film frame 10.12, and this frame 50 is mounted on a Y-direction movable frame 48 that moves only in the Y direction This allows the frame 50 to be moved freely in the X and Y directions on the film frame 10.12 manually using the handle 52. This allows two TV cameras 30
．． 32 is an arbitrary corresponding position of the original film 2.4.
Most shadows are possible.

Although not shown, one of the cameras 32 is provided with fine adjustment Pa@ in the X and Y directions, so that the position of the camera 32 with respect to the camera 30 can be finely adjusted. With this fine adjustment v1 structure, the position between the cameras 30 and 32 is adjusted especially when inspecting a transparent original film, and the images of the two original films 2.4 placed at the correct positions are accurately overlapped. Display on TV monitor.

A moving mechanism is provided to move the camera $2 in the X and Y directions separately from the shallow groove (fine adjustment).
The camera 32 is moved in the Y direction. This moving mechanism is especially used for inspection of reflective original films.

That is, in the case of a reflective original film, especially an eye-printed original film, the expansion and contraction during the engraving is large, and therefore the difference in the amount of expansion and contraction between the two original films 2.4 may be large. In general, if one of the original films is an eye-printed film and the other original film is a color separation film, this manual labor is especially important.
There are many cases where the image size of the 9j version films is significantly different. Therefore, even if the centers of the two original films are placed at the correct position with respect to the camera 30, 32, the surrounding areas may be shadowed at different positions. To eliminate this inconvenience, when inspecting the original reflection film, if you see the IFL shadow in a slightly different position on the TV monitor and the two images are misaligned, rotate the knobs 38 and 40. After adjusting the two images so that they overlap, the plate inspection process is performed. Therefore, the movement by this knob 38.40 is activated only when at least one of the selection switches 6.8 (described later) is set to the reflection side, and when both are set to the transmission side, the adjustment is made by the fine adjustment mechanism described above. The position of the camera 32 is configured to be automatically adjusted.

Generally speaking, in order to solve the problem of the difference in image size between input original films, TV cameras are equipped with a magnification adjustment mechanism that adjusts the magnification within a small range. The system is constructed so that the images are input at different magnifications, and by adjusting this magnification adjustment mechanism, the images on the TV monitor can be displayed overlapping each other accurately.

This magnification adjustment mechanism is configured such that by rotating and adjusting a magnification adjustment knob 60, the skillen rate when capturing an image with one TV camera 32 is adjusted, and the photographing magnification can be changed.

In general, the TV camera 30, 32 is provided with a filter 42, 46 for accurately copying the eye-printing, printing plate, etc. In other words, the image density of Eye-burning, 111 plate, etc. is so thin that it is difficult to get good contrast, or the color complementary to the color of the original film (for Eye-burning, yellow, etc.) is used.
Since it is preferable to imitate through the filters of light green Offcera 1 to Mavinta color filters if the printing plate is used, a plurality of filters 42 and 46 are installed so as to be replaceable.

A light source 70.72 for illuminating the reflective original film 2.4 is attached to the pedestal 50.
72 is the original film 2 for reflection through mirrors 74 and 76.
．． Illuminate 4.

This light source 70.72, like the light source 16.18, is connected to a DC stabilized power supply.

Then, the transmission/reflection selection switch 6 and/or 8 is selected depending on the type of the original film 2.4.

That is, in the case of reflection, either the upper light source 70 or 72 is selectively lit, and in the case of transmission, the lower light source 16 or 18 is selectively lit. Since the two Swiss 6.8 can be switched between transmission and reflection separately for the left and right sides, it is possible to inspect the original film even if the reflection and transmission original films are placed on the mounts 10 and 12, respectively.

Although not shown, the images copied by the two cameras 30 and 32 are displayed overlappingly on the TV monitor. Plate inspection work will be carried out using this video.

(Effects of the Invention) Since the present invention has the above configuration, it has excellent practical effects as shown below. The plate device can inspect not only a transparent original film but also a reflective original film, so that the printing process can be performed not only at the time of the original original or the negative or positive separation master film, but also at any point in the printing process. can.

The TV camera is equipped with a magnification adjustment mechanism that adjusts the magnification within a small range, and is configured so that images of multiple original films can be input at different magnifications. To solve the problem of the difference in size between images, and to display images on a TV monitor that overlap each other accurately.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram of the main parts (four grooves of the daylight machine) of the present plate inspection apparatus. 2.4...Original film 6.8...Selection switch 10.12...Original stand 16.18.70.72...Light source 30.32...TV camera 34. 36...Lens 38.40...Movement knob 42.46...Filter 48...Y direction moving stand 50...Camera moving stand 52...Handle 54. ...Operation panel 60...Magnification adjustment knob 74.76...Mirror

Claims (2)

[Claims] (1) By photographing multiple original films with a TV camera and displaying the images of the multiple original films on a TV monitor, the designs or characters of each color of the original film for color printing are placed in the specified position. In a plate inspection device that checks whether the original film is placed as specified, a light source is installed on both the lower side of the original holder where the original film is placed and the movable holder of the camera, and the TV camera is equipped with a light source within a small range. 1. A plate inspection device for both transmission and reflection, characterized in that a magnification adjustment mechanism for adjusting the magnification is provided, whereby magnifications between the images of the plurality of original films can be inputted with different magnifications. (2) The scope of claims characterized in that the magnification adjustment mechanism is configured such that by rotating and adjusting a magnification adjustment knob, the scan rate when photographing with a TV camera is adjusted and the photographing magnification can be changed. The plate inspection device for both transmission and reflection as described in item 1.