JPS58132745A - Formation of film having transparent image - Google Patents

Abstract

PURPOSE:To form a film which has the transparent images laid out from reflection originals without using any masking plate by photographing the reflection originals which are adhered to a transparent base in the assigned trimmings and layouts with light sources for the reflection originals from the front under irradiation of light from the rear thereof. CONSTITUTION:Reflection originals A-D which are removed to unnecessary parts are adhered to a sheet to transparent base 8 in conformity with layouts. The originals are set in a camera, and light is irradiated to the reflection originals from the front thereof with light sources 11, 12 for reflection originals under irradiation of light from the rear of the reflection originals with a light source 10, then a contact screen 16 is superposed thereon and the images of the reflection originals are photographed on a photosensitive film 15. The parts where the originals A-D of the base 8 do not exist aloow the transmission of the light from the rear and the parts corresponding to the film 15 are exposed with large quantity of light. Said parts are blackened when developed.

Description

DETAILED DESCRIPTION OF THE INVENTION Printing plates are generally prepared as follows. ,
First, a pattern 1 in the shape of T is placed in a predetermined position on a transparent film (1) such as a transparent plastic film as shown in Figure 1.
2+ +3) (An original printing plate film (6) in which 41 and predetermined characters (5) are formed with transparent image binding is created.

Next, in the case of offset printing, for example, in the case of offset printing, this printing original film (6) is brought into close contact with a photosensitive material (7) such as a PS plate, as shown in Figure 2, and light is irradiated from the direction of the arrow in the figure. Then, a printing plate is obtained by developing the photosensitive material (7).

As is well known, the transparent image formed on the original printing film may have a continuous tone structure or a halftone dot structure depending on the printing method.

In order to create such an original film for printing, a manuscript corresponding to the pattern f21 + 3) (41 or character (5) is required, and in the case of one character f51, a strip film etc. (・ζ formed character Sometimes it is pasted.

By the way, transparent originals are often provided as originals of pictures, etc., but there are also cases where reflective originals are provided, such as photographs with images printed on photographic paper or pictures drawn on paper. .

The following two methods are mainly used to create a printing master film using such a reflective original.
There are two methods.

One of these methods is to use a camera or scanner to create a transmission negative image from each L-reflection original, and then expose a photosensitive film using a combination of the negative image, a mask plate, and θ). .

The other one is the actual size and larger than the required trimming σ) A trimmed reflective original is pasted on a mount in a predetermined layout, and from this point a transmissive negative image is created using a camera or scanner. In this method, a photosensitive film is exposed to light using a combination of the negative image and a mask plate.

Even in the above cases, a mask plate is required, extra materials are required to create the mask plate, and time is also required to create the mask plate, which requires the work of combining the mask plate and the negative image. (, cost,
This causes inconvenience in terms of time, workability, etc. σ).

The present invention eliminates the above-mentioned disadvantages, and uses a mask plate to produce a transparent image with a predetermined image laid out at a position necessary for creating an original film for printing from a reflective original. The purpose of the present invention is to provide a new method for easily producing a film having

The present invention will be explained in detail below based on embodiments shown in the drawings.

In the present invention, first, unnecessary portions of a reflective original, such as a photograph, with an image printed on photographic paper are trimmed off according to the trimming specified on the designated layout paper. If several types of σ) patterns are used on one sheet of original printing film, all σ
) Remove unnecessary parts in the same way for the original with a reflective pattern.

Next, one sheet of the reflective original with unnecessary portions removed according to the specified trimming is attached to the transparent base according to the specified layout on the layout sheet.

Figure 3 shows a transparent base (8) with unnecessary parts such as θ) removed and reflective originals (A) (B) (Q +D
+ indicates that it has been pasted in the specified υ) layout. Stiff] Case σ) Reflective original (A) (H) (C)
(DJ is a positive image. As the transparent paste, select a transparent plastic film, a transparent glass plate, etc. as appropriate.) (-0 Next, paste it on the transparent base (8). Reflective original (Al (
B) Set Eel (1) on a camera or scanner, expose the image of these reflected originals onto a photosensitive film using the camera or scanner, and then process this photosensitive film.

When photographing with a camera or scanning with a scanner Q in this case θ), the following method is adopted.

FIG. 4 is an explanatory diagram when photographing using a camera,
Reflective originals (A) (B) (
q (IJI is set on the camera's original shelf. In Figure 4, the original shelf is shown as a transparent glass plate (9). After setting the reflective original, the reflective original σ is illuminated by the light source 01lIl) While irradiating light from the back side, the reflective original light source QIJ (121) emits light from the front side of the reflective original, and the image of the reflective original is projected onto the photosensitive film (151) set in the camera bar Q41 through the lens (131). Expose.

In this way, the exposed photosensitive film (151 + processing) is processed to obtain a film (1 film) having a transmission image. This is an explanatory diagram, and the original manuscript (IJI
Transparent images N~(U are formed corresponding to .

In the example shown in Figure 4, the photosensitive film (15)σ)
A contact screen (I6) is further superimposed on top of the contact screen (I6), which allows the transparent image (I6) formed on the film to be
N~ (This has a halftone dot structure in which the thickness of the halftone dots changes depending on the density of the original, and this exposure process corresponds to a so-called halftone shooting process.

If this exposure step is carried out without the contact screen (16) in FIG. 4, the film 15&C will form a transmitted image (N~ (continuous tone .theta. as ■) and also .nu.).

By photographing a reflective original while irradiating light from the back side as described above, the transparent base of the partially captured original where ν ~ (D) does not exist allows light to pass almost unchanged from the front side, The photosensitive film (the part corresponding to 19) is exposed to a large amount of light.

On the other hand, in the portion where the reflective originals (A) to 0) are present, the light from the back side is blocked by the reflective originals (A) to (D), and no light is transmitted. The images of the reflective originals (5) to ■) reflect the light from the anti-haline light source circle (121) to the originals (A) to ff.
Photosensitive film (15) by the light reflected by +
exposed to light.

If you use a photosensitive film (I51) that is normal, that is, a type that produces a negative image when a positive image is printed, the negative image will not be transmitted from the originals (5) to (D) that reflect the positive image. Images N to -j are obtained.In this case, the partial image where the transparent image W-ID) does not exist exhibits a degree of blackening according to the amount of light irradiated from the back side.1 Usually, it is completely blackened. It's Nishide. Transparent images (If the partial areas where N to O do not exist are prevented from turning completely black, ink will also be applied to these areas when printed, resulting in a so-called flat screen. It will have the same effect as .

The above explanation was about the case where the camera was turned on.

A similar method can be applied to the case where a scanner is used. FIG. 6 is an explanatory diagram of an embodiment of the present invention when a scanner is used. A reflective original W> (B) (Cj Q)) pasted on a transparent base (8) in this way is set, and a transparent film (181 is placed over it) covering the entire surface.
It is installed so that ~. The transparent film is used to hold down the original so that it does not float.

In general, a scanner can process either a transparent original or a reflective original, and has a transparent original light source (191) and a reflective original light source (201 (211)).

In the present invention, when scanning the reflective original set as described above, the light beam 09 for the transparent original and the light source 201 (21!) for the reflective original are turned on at the same time.

By scanning the reflective original in this way, exposing it to a photosensitive film (not shown), and developing the photosensitive film, the film has a transparent image as shown in FIG. 5, as in the case of a camera. Even when a scanner is used, whether to obtain a transparent image with a halftone dot structure or a continuous tone image can be determined as necessary.

As described above, a film having a transmitted image is obtained, but if the transmitted image of the film is a negative image, it is easily possible to obtain a film with a positive image by inverting the film. Alternatively, if a photosensitive film on which a positive image can be obtained by printing a positive image is used, a film having a positive transmitted image can be directly obtained.

In addition, the image of the 1-reflection original may be of the final finished size and the method of the present invention may be carried out at its original size.On the other hand, an image of a size different from the final finished size may be used when photographing with a camera or scanning with a scanner. It is also possible to make appropriate changes, such as the method for achieving the final finished size.

Furthermore, although it is common to use a reflective original with a black and white image, it is also possible to use one with a color image. In the case of a reflective original with a color image, it is also possible to perform color separation using a color separation filter in the process of photographing with a camera or scanning with a scanner in the method of obtaining a film having a transparent image according to the present invention.

The film containing the transparent image obtained by the method of the present invention can be used as a printing original film as it is or after being reversed.tI: If necessary, characters etc. are formed. It is of course possible to additionally form necessary characters, etc. on a predetermined portion of the film that covers the transparent surface image of the present invention by using the +1 film.

As described above, according to the present invention, a mask plate is not required when producing a printing original film, so that the material cost for the mask plate can be reduced, the number of exposures can also be reduced, and the work can be simplified.

Next, examples of the present invention will be shown.

<Example 1> A photographic paper manufactured by Kotasoku (Kodak Bori Contrast Paper) on which a black and white image of the final finishing size was formed was trimmed to remove unnecessary parts according to the specified trimming, and then a transparent plastic film was formed according to the specified layout. I used adhesive to attach it.

Next, this was set on the manuscript shelf of a Ken 91J camera (C-25D) manufactured by Dainippon Screen Mfg.
Fujiris VO-100) and a magenta contact screen for negatives manufactured by Dainippon Screen Mfg. ■.

Next, 19 20W fluorescent lamps (density 0.45J'Nl) filter used as a light source for transparent manuscripts)
I turned on four 500゛W, 120V iodine lamps equipped as a light source for reflective manuscripts, and used a 563a lens (APO-NIKKOR) made by Nippon Kogaku with an aperture of 11" and a magnification of 10. The photosensitive film 1 was exposed to light for 40 seconds.

Next, the developing temperature was 25% using a developer (Fuji H8-1) and a fixer (Fuji LF 308) manufactured by Fuji Photo Film.
When the film was developed at a temperature of 1 minute and 45 seconds at 1 minute and 45 seconds, a film was obtained which had a completely blackened negative transparent image where no photographic paper was present. This material was converted into a positive type by reversal processing and could be used as a printing original film.

<Example 2> The photographic paper affixed to the transparent plastic film created in Example 1 was placed in the document drum of a scanner, and
Turn on the light source for transparent originals and the light source (halogen lamp) for reflective originals at the same time, and create a density o between the light source and the original.
A No. 9 ND filter was inserted, the original was scanned, and a halftone structure image was exposed using a halogen lamp onto a squirrel-shaped photosensitive film (Fuji LS-500) manufactured by Fuji Photo Film ■, which was set on an exposure drum. Thereafter, the film was developed under the same conditions as in Example 1, and a film having the same transmission image as in Example 1 was obtained.

(Example 3) Halftone photography was performed simultaneously with color separation using a color separation filter under the same conditions as in Example 2, except that photographic paper with a color image was used as the reflective original.
A film having color-separated transmission images for four colors M, C, and BL could not be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a printing original film, Figure 2 is a cross-sectional diagram of the printed ψ original film on a photosensitive material, and Figure 6 is an illustration of a reflective original attached to a transparent base. figure,
FIG. 4 is an explanatory diagram when using the camera of the method of the present invention,
FIG. 5 is an explanatory diagram of a film having a transmitted image obtained by the present invention, and FIG. 6 is an explanatory diagram of the method of the present invention when using a scanner. fil...Transparent film (2)-(4)...Picture (6)...Printing original film (7)...Photosensitive material (8)...Transparent base (9)...Glass board
(1o)...Light source Old 1 (121-Light source for reflective originals 0
31...Lens Q41...Camera back (19.
...Photosensitive film 061...Contact screen (17+...Original drum 718)...Transparent film Pass...Light source for transparent originals αlFI+-...Light source for reflective originals Patent applicant Toppan Printing Co., Ltd. No. 2 1 Figure 3 Figure 1 Figure 5 Broom 67;

Claims (1)

[Claims] FI1 In a method of creating a film having a continuous tone or halftone transparent image by exposing the image of a reflective original onto a photosensitive film using a camera or scanner and developing it, one sheet σ) used as a printing original film. I don't like it,
A reflective original with a specified image is pasted on a transparent base with the specified trimming and layout, and the reflective original pasted on the transparent base is placed in a camera or scanner, and light is irradiated from the back side. A method for producing a film having a transparent image, characterized in that the surface of the reflective original σ) is irradiated with light from a light source for reflective originals, and the image of the reflective original σ) is exposed onto a photosensitive film.