JPH01243042A - Film contact reversal printer and method for preventing distortion thereof - Google Patents

Abstract

PURPOSE:To precisely print the content of an original plate on unexposed photosensitive material by means of a simple structure by placing a Fresnel lens between a light source, arranged in the lower part, the original plate and unexposed photosensitive material, placed in the upper part of a contact part. CONSTITUTION:The film contact reversal printer 5 is comprised of the contact part 3 and the light source 4, the printer 5 is the place wherein the original plate 1 and unexposed photosensitive material 2 are in contact with each other, and the light source 4 being used to irradiate the original plate 1 with a light A and to print its content on the unexposed photosensitive material 2. The Fresnel lens 9 is placed between the contact part 3 and the light source 4. The Fresnel lens 9 is a plate lens, is characterized by various types of focal lengths, and is capable of adjusting the light A, obliquely made incident on, to the light A that goes straight-ahead. Therefore, since this film contact rever sal printer is lightweight and manufactured at low cost, it has a highly practical- application and is also economical.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film contact reversal printer used for film reversal work during photolithography and a method for preventing distortion in a film contact reversal printer.

[Conventional technology]

The basic structure of a film contact reversal puller used for film reversal work during photoengraving is, as shown in Figure 3, in which an original plate 1 and an unexposed photosensitive material 2 are loaded, and the internal air is A contact part 3 is used to bring the two into close contact with each other in a blank state, and with the original plate 1 and the unexposed photosensitive material 2 in close contact, the original plate 1 is irradiated with light A and the original plate 1 is attached to the unexposed photosensitive material 2.
It consists of a light source 4 that burns the image.

The contact section 3 is located at the upper part of the film contact reversing printer 5, and includes a glass plate 6 that transmits light A from the light source 4, an original plate 1 placed on the glass plate 6, and a glass plate 6 that transmits light A from the light source 4. It is constituted by a cover 7 which can be opened and closed and brings the unexposed photosensitive material 2 stacked on top of the glass plate 6 into close contact. The light source 4 is located at the lower part of the film contact reversing printer 5, and irradiates the original plate 1 with light A, and the unexposed photosensitive material 2 superimposed on the original plate 1 is illuminated by the light A transmitted through the original plate I. An incandescent lamp, a halogen lamp, or a discharge lamp is generally used. Note that the arrangement is not limited to the arrangement in which the contact portion 3 is located at the top of the film contact reversing printer 5 and the light source 4 is located at the bottom of the film contact reversing printer 5. In some cases, the light source 4 is placed at the top, or in some cases, the contact portion 3 and the light source 4 are placed horizontally facing each other.

The procedure for printing the original plate 1 using this film contact reversal printer 5 will be explained.

First, they are placed on a glass plate 6 with the original plate 1 facing down and the unexposed photosensitive material 2 facing up. Subsequently, a lid 7 is placed over the original plate 1 and the unexposed photosensitive material 2, and the air in the space 8 between the lid 7 and the glass plate 6 is removed to create a vacuum state. The photosensitive material 2 is brought into close contact with the surface of the glass plate 6.

Then, the original plate 1 is irradiated with light A emitted by the light source 4, and the original plate 1 is
The original plate 1 is printed by exposing the unexposed photosensitive material 2 superimposed on the top of the original plate 1 to light.

In addition, it is desirable that the intensity of the light A emitted by the light source 4 be uniformly irradiated over the entire surface of the original plate 1, so if the original plate 1 is large in size, the intensity of the light A emitted by the light source 4 will be insufficient as it approaches the peripheral part of the original Fj,1. Efforts have been made to even out the intensity of the light, which tends to occur. In order to achieve uniform light distribution, a glass condenser lens (not shown) may be installed between the light source 4 and the original plate 1, or a curved mirror (not shown) may be installed below the light source 4. By reflecting the light A emitted by a mirror (not shown), the entire surface of the original plate 1 is uniformly irradiated with the light A.

[Problem that the invention attempts to solve]

However, in printing using the film contact reversing printer 5, as shown in FIGS. 3 and 4, when the light A from the light source 4 is radiated radially, the light A is perpendicular to the central part of the original plate 1. However, since the peripheral edge of the original plate 1 is inclined obliquely, the deviation B between the original plate 1 and the unexposed photosensitive material 2 increases as it approaches the peripheral edge. The problem is that the cut C occurs, which adversely affects the accuracy of tweezing alignment, the enlargement of the size when repeatedly reversing the cut mask, the alignment accuracy of the male and female versions of the bag letters, and the uniformity of the line width when thickening and thinning. There is a point.

In addition, in order to uniformly irradiate the entire surface of the original plate 1 with the light A,
If a glass condenser lens (not shown) is placed above the light source 4 to correct the parallel light A from the light source 4, it will be 1000 m1 assuming a general print size A.
Since it is necessary to irradiate light A that is parallel to the area of 00OIllll angle of repose, a condenser lens (not shown) that satisfies this requirement is a large lens with a diameter of 128011 or more, and its weight is several tens of kilograms. Lacks practicality,
There is a problem in that it becomes expensive.

Similarly, when a curved mirror (not shown) is installed under the light source 4, there is a problem in that it is less practical and more expensive in terms of size and weight.

[Means for solving problems]

This invention was made in view of the above circumstances, and its specific means is to irradiate an original plate and an unexposed photosensitive material superimposed on the original plate with light emitted from a light source from the original plate side. In a film contact reversal printer using the method and apparatus for printing the contents of an original onto the unexposed photosensitive material, radial light emitted by the light source is passed through a Fresnel lens provided between the light source and the original to produce parallel light. The process is to irradiate the original plate after making corrections.

[Operation] According to the above means, a Fresnel lens is installed between the light source placed at the bottom of the film contact reversing printer and the original plate and unexposed photosensitive material placed in the upper contact area. The light emitted radially from the light source is corrected by a Fresnel lens into parallel light incident perpendicularly to the original plate, and then irradiated onto the original plate, so that the contents of the original plate are accurately printed onto the unexposed photosensitive material.

〔Example〕

The film contact reversing printer of this embodiment and the method for preventing distortion in the film contact reversing printer will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, this film contact reversal printer has a contact part 3 that brings the original plate 1 and the unexposed photosensitive material 2 into close contact, and a contact part 3 that brings the original plate 1 into close contact with the unexposed photosensitive material 2. A Fresnel lens 9 is installed between the contact portion 3 and the light source 4 of a film contact reversal printer 5 comprising a light source 4 for printing contents. Further, a method for preventing distortion in a film contact reversing printer is to prevent distortion by correcting the light A radially emitted from the light source 4 through a Fresnel lens 9 to make parallel light A and irradiating it onto the original plate 1. be. The structure of the contact portion 3 and the light source 4 is similar to that of the contact portion 3 of the film contact reversing printer 5 shown in the prior art.
and light source 4, so the explanation will be omitted. The Fresnel lens 9 is a plate-shaped lens as shown in FIG. The Fresnel lens 9 has a characteristic of having various focal lengths, and can correct obliquely incident light A into light A that travels straight.

The procedure for printing the original plate 1 onto the unexposed photosensitive material 2 using the film contact reversing printer and the method for preventing distortion in the film contact reversing printer will be explained. Incidentally, the procedure up to bringing the original plate 1 and the unexposed photosensitive material 2 into close contact with the contact portion 3 is carried out as described in the prior art, and therefore the explanation thereof will be omitted.

First, the original plate work and the unexposed photosensitive material 2 placed on the contact area 3
The light A emitted by the light source 4 is irradiated from the original plate 1 side. At this time, the light A radially emitted from the light source 4 is incident on the Fresnel lens 9, and the light A that has passed through the Fresnel lens 9 is incident on the original plate 1. The light A that is incident on the original plate 1 and modified is
The light A passes through the original plate 1 while changing into light A corresponding to the shadow reflected on the original plate 1, and exposes the unexposed photosensitive material 2. As a result, the contents of the original plate 1 are accurately printed onto the unexposed photosensitive material 2.

〔Effect of the invention〕

As is clear from the above explanation, the film contact reversing printer and the method for preventing distortion in the film contact reversing printer of the present invention are to correct the radially emitted light into parallel light by passing it through a Fresnel lens. , the entire surface of the original plate is irradiated uniformly and perpendicularly, and the accuracy of tweezing alignment, the expansion of the size when repeatedly reversing the cut mask, the alignment accuracy of the male and female letters of the bag letters, and the thickening and thinning of the letters are improved. This does not affect the uniformity of the line width.

Additionally, Fresnel lenses are lighter and can be manufactured at lower cost than glass condenser lenses, making them highly practical and economical.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a schematic diagram of a film contact reversing printer, FIG. 2 is a plan view of a Fresnel lens, and FIG. 3 is a conventional film contact reversing printer. FIG. 4 is an explanatory diagram showing the state of distortion in a conventional film contact reversal printer. DESCRIPTION OF SYMBOLS 1... Master plate, 2... Unexposed photosensitive material, 4... Light source, 5... Film contact reversal printer, 9... Fresnel lens, A... Light. Patent applicant: Ushionitic Co., Ltd.
Attorney Mihiko Watanabe Figure 3 Figure 4 Procedural amendment (voluntary) 1. Indication of the case 1988 Patent Application No. 71191 2. Name of the invention Film contact reversing printer and distortion of film contact reversing printer Prevention method 3, relationship with the case of the person making the amendment Patent applicant address: 1-1-7 Uchikanda, Chiyoda-ku, Tokyo Name: Ushionychikku 4, Agent: 530 Tel: Osaka 06 (362) 411
1 Address: 6-7-5 Nozaki-cho, Kita-ku, Osaka, subject of amendment

Claims (2)

[Claims] (1) By irradiating the original plate and the unexposed photosensitive material superimposed on the original plate with light emitted from a light source from the original plate side,
A film contact reversal printer for printing the contents of an original plate onto the unexposed photosensitive material, characterized in that a Fresnel lens is installed between the light source and the original plate. (2) By irradiating the original plate and the unexposed photosensitive material superimposed on the original plate with light emitted from a light source from the original plate side,
In the method for printing the contents of an original onto the unexposed photosensitive material, a Fresnel lens is installed between the light source and the original;
A method for preventing distortion in a film contact reversal printer, characterized in that the radial light emitted by the light source is passed through, corrected to be parallel light, and then irradiated onto the original plate.