JPH07118764B2 - Flatbed image scanner for plate collection reading - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat type image scanner for reading a plate for printing, and particularly for reading a large size plate (original) without causing distortion. The present invention relates to a flat type image scanner for collecting plates. In other words, in order to streamline printing retouching, an electric clipping device being developed by the same applicant (an image of the disassembled version is input by a flatbed scanner, etc., is displayed as a color image on a television, and color difference and brightness difference, etc. A cutting device for extracting a cut-out drawing line (mask drawing line) of a painting and cutting the peel-off film with the plotter along the obtained drawing line. As an image input device of JP-A-62-234154) The present invention relates to a planar image scanner for reading a useful plate.

<Prior Art> Conventionally, in retouching for printing, a peel-off film is manually cut to make a mask. However, since such manual work requires labor, the above-mentioned electric cutting device was developed. However, when a general TV camera was used for this image input, it was found that distortion occurred and an accurate image could not be input, and I tried using various other commercially available image input devices. There are some drawbacks such as difficulty in input, and none was satisfactory.

<Problems to be Solved by the Invention> Generally, in printing, patterns such as photographs and paintings are color-separated and shaded to produce a color-separated negative film. Illustrations, graphs, line drawings such as tables, and letters and logo marks are mainly photographed by cameras to make negative films. Negative films made from such various originals are pasted at a predetermined position on a single Mylar film in units of 4 to 8 pages to make a plate. That is, large size printed matters such as posters are collected one by one, and A4 books and the like are collected in units of 4 to 8 pages.

However, the size of the document table of a general flat image scanner was at most A3. For this reason, since it is not possible to read all the image information of a large document such as a plate collection at the same time, it is necessary to change the position of the document on the document table and partially read it. However, in the conventional flat image scanner, there are cases in which the central portion of the stencil sheet cannot be positioned within the reading range on the platen because it obstructs the mounting position of the cover for the document pressing, the mounting position of the light source, and the like. there were.

Therefore, according to the present invention, it is possible to position an arbitrary portion of a large-sized document within the reading range on the platen, it is possible to read large-sized image information such as a stencil plate, and distortion occurs. It is an object of the present invention to provide a flat-type image scanner for inputting a plate that can suppress the above.

<Means for Solving the Problems> A flat-type image scanner according to the present invention is provided with a housing having a photoelectric conversion unit made of CCD and an upper surface of the housing, and at least a portion corresponding to the photoelectric conversion unit is transparent. A document table serving as a reading window, and a position of the reading window is arranged considerably rearward of the document table, and a light source movably supported at a position corresponding to the photoelectric conversion means in an upper portion of the housing. A flat type image scanner for plate-collection reading, comprising an arm supporting the light source and a gap portion provided inside the housing for accommodating a document inside a connection portion of the housing.

<Operation> According to the flat image scanner according to the present invention, when a document is larger than the upper surface of the housing, the part of the document which is not being read at present is accommodated in the gap so that the document of arbitrary size can be arbitrarily selected. Can be placed within the reading range on the platen, and an image of a large-sized document such as a plate collection can be read.

<Embodiment> An embodiment of a flat plate type image scanner for reading a plate according to the present invention will be described below with reference to the drawings.

FIG. 1 is an inclined view showing the structure of one embodiment. On the upper surface of a rectangular parallelepiped housing 1, there is a document table 2 made of a magnet sheet. The magnet sheet is magnetic, and this is because the register pin 3 for aligning the position of the plate as a document over the four plates of yellow, magenta, cyan, and black is adsorbed and fixed at an arbitrary position. The size of the surface of the housing, in other words, the document table 2
The size of is 920 mm in height and 1000 mm in width.

A transparent member such as glass is fitted in a part of the document table 2 to form a reading window 4. The reading window 4 is 155 mm long and 130 mm wide. The position of the reading window 4 is a central portion in the horizontal direction and a position considerably rearward in the vertical direction (reading window 4
Is located 320mm from the rear). A line sensor composed of a CCD is provided below the reading window 4, and the line sensor is moved in the direction orthogonal to the array direction at the portion of the reading window 4 to place the original 8 placed on the reading window 4.
Is two-dimensionally scanned. The line sensor consists of 2048 elements.

Continuously from the rear end of the document table 2 to the rear side surface of the housing 1,
A gap 5 is provided which is open on both sides and has a substantially U-shaped cross section. The space between the gaps 5 is 80 mm. An arm 6 is provided outside the gap 5, and a light source 7 is attached to a vertically movable portion 6-a at the tip of the arm 6, whereby the light source 7 moves vertically above the reading window 4 of the housing 1. Supported as possible. During reading, the light source 7 presses the original 8 against the reading window 4 by lowering the movable portion 6-a of the arm as shown in FIG. The light source 7 comprises a parallel linear fluorescent lamp facing the line sensor. As the line sensor moves, the fluorescent lamp also moves.

Although not shown, the output of the line sensor is output as image information and supplied to the above-mentioned clipping device or the like.

According to such a flat type image scanner for plate collection,
When the document is larger than the upper surface of the housing, the document protruding from the upper surface toward the support arm 6 of the light source 7 can be stored in the gap 5. At this time, since the rear end of the document table 2 is rounded to 2-a, the document is not scratched. As a result, the document can be freely positioned anywhere on the upper surface of the housing without being disturbed by the support arm of the light source. Therefore, an arbitrary portion of a large-sized original for collecting plates can be arranged on the reading window 4, and thus an arbitrary portion of the original can be read. In this embodiment, it is possible to read any portion of the stencil sheet up to the finishing size of B2.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the gap 5 may not be attached to the outside of the housing 1, but the housing itself may be cut out along one side face in the height direction to form the gap. In addition, the dimensions of the above-mentioned portions are examples for description,
It's not something you get stuck with.

<Effects of the Invention> As described above, according to the present invention, it is possible to position an arbitrary portion of an original having an arbitrarily large size within the reading range on the original table, and to make an image of a large size such as a plate collection. (EN) Provided is a flat type image scanner for plate collection which can read information as well as can be read without causing distortion by CCD.

Since the platen is composed of a magnet board that can attract the register pins, the register pins 3 for aligning the position of the plate as the document over the four plates of yellow, magenta, cyan, and black are fixed by suction at any position. can do.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a flat image scanner according to the present invention, and FIG. 2 is a perspective view of the same reading state. 1 ... Housing, 2 ... Document stage 3 ... Register pin, 4 ... Reading window 5 ... Gap, 8 ... Document

Claims (1)

[Claims] 1. A housing containing a photoelectric conversion means made of CCD, an original table provided on the upper surface of the housing and having a transparent reading window at least at a position corresponding to the photoelectric conversion means, and the housing. Between a light source movably supported in an upper portion at a position corresponding to the electric conversion means, an arm supporting the light source, and a connection portion between the document table, the arm supporting the light source, and the housing. A flat type image scanner for plate type reading, comprising: a side plate and a gap portion formed by a document platen for accommodating a document, and having a rounded end in contact with the gap part of the document platen.