JPH0420047Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a ruling device for a phototypesetting machine that phototypes ruled lines by relatively moving a light spot and a sensitive material.

[Prior Art] FIG. 4 shows a conventional marking device described in Japanese Patent Publication No. 53-37015. The light emitted from the light source 50 is
The photosensitive material drum 57
The light reaches the upper sensitive material 60 and forms a light spot 64. The sensitive material drum 57 is rotatable by a drive source 58, and the travel system 55 is movable by a drive source 56. That is, the position of this light spot 64 on the photosensitive material 60 can be moved by the drive source 56 and the drive source 58. The dial 52 is provided with a square ruled line pattern 62 (aperture) as shown in FIG. Therefore, by moving the light spot 64 by the driving source 56, on the photosensitive material 60,
Horizontal ruled lines as shown in FIG. 6 can be exposed. Similarly, vertical ruled lines can be drawn by driving the drive source 58.

[Problems to be Solved by the Invention] However, the conventional marking device as described above has the following problems.

For example, if you draw ruled lines as shown in Figure 6,
As shown in FIG. 7, the concentration was low near the starting point S and the ending point E. This is because while the central portion M of the ruled line is exposed for a time corresponding to the width W of the ruled line pattern 62 (see FIG. 5), the exposure time is shorter at the starting point S and end point E. To become. Therefore, density unevenness occurs at the edges of the ruled line, making it impossible to obtain a ruled line with clear edges.

Furthermore, in order to avoid the above problem, there is also an apparatus that uses a ruled line pattern 62 with a narrow width W in the ruled direction R (see FIG. 8). By narrowing the width W in the ruling direction R, density unevenness at the ruled line ends becomes less noticeable. However, in such a device, a ruled line pattern for horizontal ruled lines (FIG. 8) and a ruled line pattern for vertical ruled lines (FIG. 9) must be prepared, and the operation is complicated.

This idea solves the above problems and
To provide a ruling device which can use the same ruled line pattern for both vertical ruled lines and horizontal ruled lines, and which can draw ruled lines without density unevenness at the edges.

[Means for Solving the Problems] The ruling device of the phototypesetting machine according to this invention uses a square ruled line pattern and performs exposure with the ruled line pattern twice at the beginning and end of the ruled line. It is a feature.

[Function] By using a square ruled line pattern, ruled lines can be drawn both vertically and horizontally using the same ruled line pattern. Furthermore, by performing exposure using the ruled line pattern twice at the beginning and end of the ruled line, it is possible to compensate for the insufficient amount of light at the end of the ruled line.

[Embodiment] FIG. 1 shows a block diagram of a phototypesetting machine equipped with a ruling device according to an embodiment of this invention. 1 is a dial with a ruled line pattern and letters. Reference numeral 2 denotes a light source that irradiates the dial 1 and forms light spots 22 on the photosensitive material 20 for exposure. Reference numeral 3 denotes a lens for enlarging or reducing the ruled line pattern of the dial plate 1, etc. 4 and 6 are mirrors or prisms that reflect or refract the light beam transmitted through the lens 3 so as to direct it toward the sensitive material 20. Reference numeral 5 denotes a shutter for exposing character images and the like onto the photosensitive material 20. 7
is a magazine drum which is a photosensitive material holding member.
8 is a light amount control device that controls the amount of light by controlling the voltage of the light source 2. Reference numeral 9 denotes a pattern detection device that detects the position of the dial plate and detects the thickness of the ruled lines. 10 is a shutter control device that controls the shutter 5. Reference numerals 11 and 12 are feeding devices that relatively move the light spot and the photosensitive material. 1
3 is a feed control device for the feed devices 11 and 12. Reference numeral 14 denotes a ruled line coordinate storage device for storing the starting and ending positions of a ruled line. 15 is a light amount storage device. Reference numeral 16 denotes a switch group that issues various signals including a marking command. 17 is a control device that comprehensively controls each of the above devices.

In this embodiment, the thickness of the ruled line is detected based on the position of the dial, but an image of the pattern may be captured by an imaging device and the thickness may be detected based on the image of the pattern.

Next, the operation of drawing ruled lines using this device will be explained. Here, it is assumed that ruled lines as shown in FIG. 6 are drawn. By moving the dial 1, a square ruled line pattern 62 (see FIG. 5) corresponding to the thickness U of this ruled line 30 is selected.

By the way, such square ruled line pattern 6
2, the exposure time in the ruling direction R changes depending on the thickness of the ruled line. In other words, when drawing thick ruled lines, the exposure time is long;
When drawing thin ruled lines, the exposure time becomes shorter. As a result, a problem arises in that the density varies depending on the thickness of the ruled line.

Therefore, in this embodiment, the amount of light is changed depending on the thickness of the ruled line, so that the density remains constant. That is, the pattern detection device 9 detects the thickness W (=U) of the ruled line pattern 62. The control device 17 reads appropriate light amount data from the light amount storage device 15 based on the detected thickness. Furthermore, the control device 17 controls the light amount control device 8 based on the read light amount data, and controls the light amount of the light source 2 to an appropriate value according to the thickness of the ruled line. In this way, ruled lines with constant density are drawn regardless of the thickness of the ruled line.

Here, if ruled lines are drawn so that the density is H, density unevenness occurs at the starting point S and ending point E due to insufficient light quantity, as shown in FIG. 2A. Therefore, exposure is performed again using the same ruled line pattern at positions 70 and 72 in FIG. 2B (double exposure). The movement of the light spot 22 to the positions 70 and 72 is performed by the control device 17 controlling the feed control device 13 based on the coordinate positions stored in the ruled line coordinate storage device 14.

FIG. 2C shows the density at which the photosensitive material 20 is exposed by the above-mentioned double exposure. In FIG. 2A, it is clear that the underexposed portions are now exposed. As a result, the ruled lines in Figure 2
As shown in D, the underexposure at the edges is resolved.
That is, it is possible to draw ruled lines without uneven density at the edges.

In addition, as shown in FIG. 2D, the dense part 7
4,76, but this does not pose a problem in terms of print quality. This is because, due to the characteristics of the photosensitive material 20, a density difference in a high density region becomes almost imperceptible after development.

Of course, if the ruled line pattern is thin and the difference in density at the edges is not a problem, it is not necessary to perform the above-mentioned double striking.

Further, in the above procedure, the control device 17 receives the marking signal from the switch group 16, and the light amount control device 8, the shutter control device 10, and the feed control device 13
It can be automated by controlling the

Next, the case of drawing ruled lines will be explained based on FIG. 3. When drawing the ruled lines shown in FIG. 3A, first, the lines between a and b are drawn (FIG. 3B). At this time, two strikes are made at a and b in the same manner as above.
Next, a line is drawn between b and c (FIG. 3C). At this time, b
Since we have already hit twice in , c
Strike twice only. Similarly below,
Line the CDs (Figure 3D). Finally, draw lines between da (Fig. 3E). At this time, since both a and b have already been struck twice, they are not struck twice.

In the above manner, the ruled lines can also be drawn automatically.

In this case, after drawing the four ruled lines, the four corners may be struck twice, or the four corners may be exposed in advance with a ruled line pattern, and then the ruled lines may be drawn.

[Effects of the invention] In the ruling device according to this invention, by using a square ruled line pattern, both vertical and horizontal directions can be
You can draw ruled lines using the same ruled line pattern. Furthermore, by performing exposure using the ruled line pattern twice at the beginning and end of the ruled line, density unevenness at the end of the ruled line can be eliminated.

That is, according to this invention, it is possible to obtain a ruling device that can use the same ruled line pattern for both vertical ruled lines and horizontal ruled lines, and can also draw ruled lines without uneven density at the edges.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a phototypesetting machine having a ruling device according to an embodiment of the invention, FIGS. 2 (A to D) are diagrams for explaining marking by the ruling device of FIG. 1, and FIG. 4 is a diagram illustrating the operation of drawing the rules, FIG. 4 is a diagram showing a conventional ruling device, and FIG.
is a diagram showing the ruled line pattern 62, FIG. 6 is a diagram showing the ruled lines, FIG. 7 is a diagram showing the density distribution of the ruled lines, and FIG.
FIG. 9 is a diagram showing a conventional pattern for horizontal ruled lines.
1 is a diagram showing a conventional pattern for vertical ruled lines. 1... Dial board, 2... Light source, 7... Magazine drum, 17... Control device, 20... Photosensitive material.

Claims (1)

[Claims for Utility Model Registration] A light source, a dial plate having a square ruled line pattern, and a photosensitive material holding member for holding a photosensitive material at a position of a light spot formed by the light source and the ruled line pattern. , a ruling device for a phototypesetting machine which performs ruling by moving the position of the light spot on the photosensitive material and exposing it to light, wherein the ruled line pattern is applied at the beginning and end of the ruling. A ruling device for a phototypesetting machine characterized by performing exposure twice.