JPH02109048A - Mask producing device - Google Patents

Abstract

PURPOSE:To surely and effectively illuminate the illuminating light beams required on a reading part by reading and binarizing the density information of transmitted light beams from a reading original, outputting from the title mask device, and illuminating linearly the main scanning direction almost orthogonal to the moving direction of the reading original with an illuminating part. CONSTITUTION:The reading original C is set on an original placing table 12, at the position which the table on a first box 18 of the title mask making device 10 exists outside of a second box 20. In this case, the original C is press- contacted by a platen glass 60 held by a frame body 58 and a glass table 54 is elastically supported by coil springs 53a-53d, which displace according to the thickness of the original C. Then the original C is held between the glass table 54 and a glass 60. Next, the table 12 is carried toward inside of the box 20 under the driving action of a motor for driving 36. The original illuminating part 14 illuminates linearly in the main-scanning direction almost orthogonal to the moving direction of the original C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mask making device, in which a light source is used to convey a read document in which a cutout document of a reflective type is attached to a transparent base in a sub-scanning direction. By irradiating illumination light in a line shape in the main scanning direction onto the read document to obtain density information of the passing light, and creating a mask by binarizing this density information, illumination efficiency is improved and The present invention relates to a mask making device which can prevent unevenness in illumination light and which can be easily miniaturized.

[Background of the Invention] For example, in the fields of printing and plate-making, booklet synthesis is widely used to synthesize pictures and pictures, pictures and letters, pictures and marks, etc. for the creation of catalogs, pamphlets, and leaflets.

This type of collection synthesis work will be schematically explained using FIG. 1. First, reflective originals B+ and B2, which have been cut out in advance, are pasted onto a transparent base A to form a reading original C. Next, a screen negative D and a mask E are respectively created from the read original C, and a cutout E1 corresponding to the character original F is formed in the mask E. In this case, the text manuscript F
A negative G is obtained by taking a photograph of the net negative D,
Mask E and this negative G are overlapped and exposed and developed,
Form a net positive H. Then, after printing is performed using the above-mentioned net positive I, a predetermined pamphlet or the like is created.

Therefore, as an apparatus for manufacturing the mask E in the above-mentioned booklet synthesis work, for example, an apparatus as shown in FIG. 2 is known. That is, the above-described original document C to be read is positioned upside down on the mounting table 4 provided at the upper part of the device 2, and the illumination lamp 6 is energized to emit illumination light 8.
irradiates the entire back side of the original document C to be read. At this time, within the device 2, for example, a movable line sensor is provided, which detects the transmitted light from the original document C to be read, reads the density information of this transmitted light, and reads the binary value. It has been subjected to chemical treatment. As a result, a negative output signal is obtained, and the mask E is created using this signal.

However, in the above-described prior art, the line sensor is sequentially conveyed in the sub-scanning direction while the illumination light 8 is irradiated onto the entire surface of the read document C from the illumination lamp 6, and the transmitted light from the read document C is detected.

For this reason, it has been pointed out that the illumination light 8 is irradiated even to parts that are not substantially being read, resulting in poor illumination efficiency.

Furthermore, it is extremely difficult to uniformly irradiate the entire surface of the document C to be read with the illumination light 8, resulting in uneven light intensity and, for example, poor reading of image edges, making it difficult to read density information with high accuracy. The disadvantage is that it is not achieved. In this case, it is conceivable to move the illumination lamp 6 relatively far away from the mounting table 4 and increase the amount of light from the illumination lamp 6, but this poses the disadvantage of increasing the size of the entire apparatus 2.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned disadvantages, and the present invention has been made in order to overcome the above-mentioned disadvantages. The illumination light is irradiated in a line by the scanner, and the density information of the transmitted light from the original is read by a line sensor and binarized to obtain a negative output. The illumination area can be reduced as much as possible and the weight of illumination light can be effectively reduced, and there is no need to separate the light source from the document to be read, making it possible to easily miniaturize the entire device. The purpose is to provide a mask making device.

[Means for Achieving the Object j] In order to achieve the above-mentioned object, the present invention irradiates illumination light while moving a read document in which a reflective document is attached to a light-transmissive base in a predetermined direction. A mask creation device that reads density information of transmitted light from a scanned document, performs binarization processing, and outputs it, and irradiates illumination light in a line in a main scanning direction that is substantially perpendicular to the moving direction of the scanned document. The invention is characterized by comprising a lighting section.

[Embodiments] Next, preferred embodiments of the mask making apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 3 and 4, reference numeral 10 indicates a mask production apparatus according to this embodiment. This mask making device 1
Reference numeral 0 denotes a document placement table 12 on which a read document C is placed and is movable in the directions of arrows X, , and X2, and a document illumination unit 14 that projects illumination light onto the read document C placed on the document placement table 12. and an image reading unit 1 that photoelectrically converts transmitted light from the original document C to be read.
It basically consists of 6. In this case, the document placing table 12 and the document illumination section 14 are arranged on the first casing 18, and the image reading section 16 is arranged on the second casing placed on one end side of the first casing 18. It is disposed within a space defined in body 20 . A document placement table 1 is provided under the side surface of the second casing 20.
A rectangular opening 22 is formed to allow the opening 22 to pass through.

Next, as shown in FIG. 4, guide bars 24 are installed horizontally and parallel to each other on the upper surface of the first casing 18.
a, 24b are arranged, and these guide bars 242.2
Both ends of the support base 26a, 2 are mounted on the first housing 18.
6b and 28a, 28b. Further, between the guide bars 24a and 24b, both ends thereof are connected to a bearing 3.
A ball screw 34 supported by 0 and 32 is arranged in parallel.

In this case, the ball screw 34 is rotationally driven by a drive motor 36 provided within the first housing 18.

That is, the pulley 38 is engaged with the end of the ball screw 34 inside the second housing 20, while the drive motor 3
A pulley 42 is also engaged with the rotating shaft 40 of No. 6, and these pulleys 38 and 42 are connected by a belt 44.

Furthermore, guide members 48a and 48b through which guide bars 242 and 24b are inserted, and nut members 50 that are screwed into ball screws 34 are fixed to the bottom surface of the housing-like base 46 constituting the document table 12, respectively. . Furthermore, openings 50a15f)b are defined on both sides of the base 46 in the displacement direction. A housing 52 in which the document illumination section 14 is housed is inserted through the openings 50a and 50b. Further, at the four internal corners of the base 46, a mounting glass stand 54 is elastically supported by rib portions protruding inward from the side surface via coil springs 53a to 53d.
The original document C to be read is placed on top.

Next, a frame 58 is attached to the base 46 so as to be openable and closable, and a platen glass 60 is held by this frame 58.
The configuration is such that the read original C is pressed against the glass table 54.

Here, the document illumination unit 14 installed in the housing 52 is illuminated in the main scanning direction when the read document C held on the document placing table 12 is conveyed in the sub-scanning direction in the direction of arrow X1 via the document placing table 12. Illumination is performed in a line along the arrow Y direction. That is, an opening 62 extending in the main scanning direction (arrow Y direction) is formed at a predetermined position of the housing 52,
A light source 64 is disposed below this opening 62 and within the housing 52 . In this case, the light source 64 has a rod-like shape elongated in the main scanning direction and is made of, for example, a fluorescent lamp or a halogen lamp, and a reflecting mirror 66 is provided below the light source 64 as required.

On the other hand, an image reading section 16 is disposed in the upper space within the second housing 20. The image reading unit 16 includes a reflection mirror 70 that guides the transmitted light that has passed through the original document C to be read, and an imaging camera 72 that photoelectrically converts the transmitted light to form an image signal.

In this case, the transmitted light from the document C to be read is transmitted to the imaging camera 72.
Photoelectric conversion is performed by a CCD provided inside, and an image density signal is thereby obtained.

The mask making device according to this embodiment is basically configured as described above, and its operation and effects will be explained next.

First, in FIG. 4, the document mounting table 1 on the first housing 18
2 is located outside the second housing 20, and the document mounting table 1 is
2. Set the original C to be read. In this case, when the platen glass 60 held by the frame 58 presses the document C to be read, the glass stand 54
3d, it is displaced according to the thickness of the document C to be read, and functions to hold the document C between the glass table 54 and the platen glass 60.

Next, under the driving action of the driving morph 36, the document placing table 1 is moved.
2 is transported into the second housing 20. That is, the rotational drive of the drive motor 36 is transmitted from the pulley 42 via the belt 44 to the ball screw 34 on which the pulley 38 is pivoted, thereby rotating the ball screw 34 in a predetermined direction. The original table 12, which is provided with a nut member 50 that is screwed onto the ball screw 34, is guided by the guide bars 242, 24b and moves in the sub-scanning direction (the direction of the arrow x1). As a result, the manuscript l! The mounting table 2 is then transported to the document reading position inside the second housing 20.

In this state, the document illumination section 14 is driven.

In this case, the illumination light output from the light source 64 is
The light reaches the inside of the document table I2, and illuminates the document C to be read along the main scanning direction (direction of arrow Y) perpendicular to the paper surface. This illumination light passes through the original document C to be read as transmitted light, is reflected by a reflection mirror 70, and is then guided to an imaging camera 72.

The transmitted light is photoelectrically converted by the imaging camera 72 to obtain a predetermined image density signal, which is binarized and sent to an output section (not shown) to create a mask E (see Figure 1). I do.

In this way, the document table 12 moves inside the second housing 20 as indicated by the arrow X.
By moving in the force direction, that is, in the sub-scanning direction, all image information of the document C to be read is read.

After the image reading operation of the reading original C is completed, the original illumination unit 1
4 is stopped, and the ball screw 34 is rotated in the opposite direction to that described above under the driving action of the drive motor 36.

For this reason, the document placement table 12 has guide bars 242 and 24b.
It moves in the direction of the arrow X2 and is transported from the inside of the second casing 20 to the outside. Then, the driving motor 36 is stopped and the original document C to be read is taken out from the original document mounting table 12.

In this case, in this embodiment, a rod-shaped light source 64 elongated in the main scanning direction is disposed in the document illumination section 14, and the document C to be read is illuminated along the main scanning line under the biasing action of this light source 64. There is.

In this way, since the light source 64 illuminates only the area required for reading the document C, local unevenness in light intensity does not occur, and the density information at the edge of the image can also be reliably read to ensure accurate reading. It becomes possible to obtain an image density signal.

Furthermore, compared to the conventional method that illuminates the entire surface of the document C to be read, it is possible to use a smaller and lower output light #64. Moreover, light source 6
4 can be arranged as close as possible to the original document C to be read, which provides the advantage that the entire mask making apparatus 10 can be easily miniaturized.

By the way, in this embodiment, as shown in FIGS. 3 and 4, a rod-shaped light source 64 is employed in the document illumination section 14, but if the document illumination unit 14 illuminates the document C in a line shape, it may be used. Various configurations can be applied. This is illustrated in FIG.

That is, the document illumination section 14a according to the second embodiment
is a light source 80 consisting of a halogen lamp, xenon lamp, etc.
a fiber bundle 82 configured by bundling a large number of optical fibers and guiding the illumination light outputted from the light source 80 to the original document C to be read; and a cylindrical lens 84 that emits light.

A heat shielding filter 86 is disposed close to the light source 80,
A cylindrical entrance end holder 88 made of creel is disposed to face the heat shielding filter 86, and one end portion of a large number of optical fibers constituting the fiber bundle 82 is bundled by the entrance end holder 88. . On the other hand, the other end of the fiber bundle 82 is attached to a long output end holder 9.
The optical fibers are arranged in a line with a predetermined distance between them. The tip of the optical fiber is parallel to the main scanning line 92.

Next, a cylindrical lens 84 is disposed parallel to the output end holder 90, and a reflection mirror 94 is disposed parallel to the cylindrical lens 84 at a predetermined angle.

In such a configuration, the illumination light output from the light source 80 passes through the heat shielding filter 86 and then passes through the entrance end holder 88.
and enters the fiber bundle 82. The illumination light is guided by this fiber bundle 82 and placed in the output end holder 90.
The fiber bundles 8 are arranged in a line at
The light is irradiated from the end of each optical fiber constituting 2.

This illumination light is condensed through a cylindrical lens 84 and reaches a reflecting mirror 94 . The illumination light reflected by the reflection mirror 94 illuminates the original C to be read along the main scanning line. Therefore, the transmitted light from the read document C is guided to the photographing camera 72 via the reflection mirror 70.

Therefore, it is easily understood that the original illuminating section 14a can achieve the same effect as the aforementioned original illuminating section 14.

[Effects of the Invention] As described above, according to the present invention, illumination light from a light source is illuminated in a line shape along the main scanning line on a read document in which a reflective cutout document is attached to a light-transmissive base. It is configured like this. Therefore, it is possible to reliably and efficiently irradiate illumination light to the portions of the document to be read that are necessary for reading, and it is possible to prevent reading defects such as image edges due to unevenness of light. Moreover, the light source itself can be miniaturized and the light source can be placed close to the document to be read, so that the overall size of the apparatus can be easily miniaturized.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a general booklet synthesis process, FIG. 2 is a partial perspective view of a mask making device according to the prior art, and FIG. 3 is a perspective view showing a schematic configuration of a mask making device according to the present invention. FIG. 4 is a cross-sectional explanatory view of the mask making apparatus, and FIG. 5 is an explanatory view of essential parts of a document illumination section according to another embodiment of the mask making apparatus.

Claims (3)

[Claims] (1) Illumination light is irradiated onto a reading original with a reflective original attached to a light-transmissive base while moving it in a predetermined direction, and the density information of the transmitted light from the reading original is read and binarized. What is claimed is: 1. A mask creation device for outputting a mask, the device comprising: an illumination unit that irradiates illumination light in a line in a main scanning direction substantially orthogonal to the direction of movement of the read document. (2) The mask making device according to claim 1, wherein the illumination section has a bar-shaped light source extending along the main scanning line of the read document. (3) In the apparatus according to claim 1, the illumination section includes a light source, a rod-shaped lens extending along the main scanning line of the read document, and an optical fiber bundle that guides illumination light from the light source to the rod-shaped lens. Features of the mask making device.