JPS58136500A - Method of painting out closed figure by photo-plotter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for efficiently filling in a portion surrounded by a closed figure using a photopour with a variable aperture.

Fixed size circular aperture (Small II for film exposure)
When filling in a closed figure using a hole with a large hole (usually circular), it is necessary to fill in a closed figure with a missing part as shown in Figure 1. It's impossible. The reason for this is that even if you try to use a circular aperture with a diameter of d to fill it in finely and finely, the tip end will look like the one shown in Figure 2.
To accurately paint the area where tA is applied, the diameter d must be @
A small aperture must be used.

However, it is not a good idea to paint a large area using such an aperture because it takes a lot of time.

The present invention seeks to provide a coating method that uses a variable aperture to solve the above-mentioned problems.

FIG. 5 shows the head portion of a photo block (hereinafter simply referred to as a plotter) used in the present invention. In the figure, 1 represents a film and 2 represents a head portion. The head section moves over the film 1, the position of which is controlled by a monitor (not shown), etc., and irradiates light from the front as shown in FIG.

The thickness of the light beam irradiated from the head 2 is adjusted by a variable aperture as shown in Fig. 4. In Fig. 4, S to 6 are blades forming the aperture.
It can be moved in the direction of the arrow shown in FIG. At this time, these blades operate with bears 5 and 4 and bears 5 and 6, and one blade does not move alone. For example, assuming that the moving direction of the blades 5 and 60 is the X-axis direction, when the blade 5 shifts in the -X direction, the blade 6 operates to shift the same distance in the +X direction in conjunction with this. In other words, in this case, the distance between the two blades S and 4 is widened. Conversely, if the blade S is shifted in the +X direction, the blade 4a is shifted the same distance in the X direction. do. In this case, the operation is such that the distance between the blades 5 and 6 becomes narrower.

Note that the operations of the blades 5 and 4 are also the same as described above.

As described above, the shaded area of the aperture shown in FIG. The diameter of the beam is adjusted by a variable aperture, and the thickness of the beam is adjusted to a predetermined value.The beam is further assembled into the head section 2, and the beam is reduced by an optical system including nine lenses and irradiated onto the film. In addition, the moving direction and distance of the blade l-4 mentioned above are for the combination.
controlled by the data. By such an operation, the plotter used in the present invention can expose a straight line on the film as shown in FIGS. 5 and 6 in one operation.

Figure 5 is a simple straight line, for example, the size of the diagonal part of the aperture is fixed.It was drawn by Jin and K, who move the head while shining light onto the film through this part A. According to a commercially available plotter, the straight line width %io indicated by the 11th AK is 51J≦Wo<8
It can be drawn within the range of 001J.

FIG. 6 shows a tapered straight line drawn by moving the head while changing the distance between the blades 5 and 4 of the aperture, for example, to enlarge or reduce it. In FIG. 6, the width W1 of the narrow portion can be a minimum of Sp&, and the width W2 of the wide portion can be a maximum of 800 IJ. In Figure 114, due to the interlocking nature of the blades described above, the taper angle is symmetrical with respect to the axis.

It is an object of the present invention to provide a method of exposing the inside of a closed figure to light so as to efficiently fill it in, using a plotter having the above functions.

Figure 7 is a diagram showing an example of a closed figure to be filled in. In Figure 7, a nine polygon surrounded by only straight lines is shown as a closed figure, but this polygon If the circular arcs meet, the circular arc portion is approximated by a broken line within the tolerance, and is identified as the same as No. 71Ii. be able to.

Coloring the figure in Figure 7, let's consider subdividing this figure using parallel lines.

The interval between these parallel straight lines is usually set to the maximum line width WMAx that can be drawn in one plotting operation of the plotter. This is because the layer weight can minimize the coating time. However, the present invention also works even if the distance between the parallel lines is set to MAX or less, for example to prevent gaps between coatings.

However, when dividing by the maximum line width "MAX", if a vertex of a polygon is included in the part between the two parallel lines, as an exception, a straight line passing through that vertex will be used to divide the polygon. If such a line is shown in Fig. 7, e□,
e2. e3, etc. According to the above division method,
Polygons are subdivided into trapezoids and triangles only.
In the figure, the area is subdivided by straight lines parallel to the horizontal direction, but the present invention can also be achieved by subdividing the area by straight lines parallel to the vertical direction.

In this way, in the present invention, each of the subdivided triangular and trapezoidal parts is exposed one after another in a black-and-white manner, and the method will be described below.

Figure M8 and Figure 9 are triangles 1 that are subject to mb crushing.
It is a figure which shows an example. As shown in FIGS. 6 and 6, by drawing a line from one vertex to the opposite side, all triangles can be divided into two right triangles.

FIG. 10 is a diagram showing an example of a right triangle. Let the vertices of this right triangle be M, B, and C as shown in the figure. K on side BC of triangle ABC AC-■□ and ABII
-AD2, the point D1. If we take D2, we have two triangles AC
D1 and ABD2 are isosceles triangles. In this way, every right triangle can be divided into two isosceles triangles. It is possible to paint each part in one drawing operation (However, the 2nd part of the triangle is 2 degrees). In this way, divide all the triangles into isosceles triangles, and paint each isosceles triangle.

To summarize the above method, the triangle is divided into right triangles and then divided into t2 isosceles triangles. However, the present invention also works as follows: This is a method of directly dividing a triangle into isosceles triangles without dividing it into right triangles. The IkJl crushing method in this case is shown in Fig. 12. In the same figure, triangle % IFG
can be divided into two isosceles triangles IEFH and FGJ! The 21-sided triangle can be drawn in one drawing operation using the tapered straight line shown in FIG. 6, but the case shown in FIG. 12 has the following drawbacks.

In order to speed up the filling operation, it is preferable to divide the polygon by the maximum line "MAX" (for example, the interval of aoOp). However, as shown in Figure 912, if it is divided into isosceles triangles without going through right triangles, it becomes isosceles. The bases FH and JG of the triangle may exceed the maximum line width "MAX".

Therefore, in the case shown in Figure 12, it is necessary to narrow the interval between the parallel meshes that divide the polygon to prevent the above situation from occurring.) As a result, the filling operations are continuous. (There is a drawback.

On the other hand, fill in the trapezoid as follows. FIG. 11 is a diagram showing an example of a trapezoid. As shown in the figure, a trapezoid can usually be divided into two right triangles and one rectangle. Of course, if one vertex of the trapezoid is a right angle, or if the trapezoid is a rectangle, the number of triangles generated will be 1 or 0. If the trapezoid is divided as shown in Figure 11, the two right triangles can be filled in using the method described above, and the remaining rectangular part can be filled in once using the straight line as shown in Figure 5. It's fun to be able to fill it up with movement.

As described above, according to the present invention, all polygons can be divided into groups of triangles and trapezoids, and by filling in the triangles and trapezoids one after another, the interior of the polygon can be efficiently filled in. It slows down due to exposure.

Although it has been explained above that a polygon is divided into three squares and a trapezoid, if the polygon is a rectangle or trapezoid, it is obvious that no triangles will be formed.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a part of the figure to be filled,
Figure 2 is a diagram showing the case of filling with a conventional aperture. Figure %II5 is a diagram showing the head section of the plotter used in the present invention, and Figure 411Q is a diagram explaining the operation of the variable aperture portion of the plotter used in the present invention. Figure 5 is an example of a nine straight line drawn with the plotter used in the present invention, Figure 6 is an example of a tapered straight line drawn with the plotter used in the present invention, and the ly diagram is an example of a straight line drawn with the plotter used in the present invention. Figures 8 to 12 are diagrams illustrating the method of filling in triangles and bases according to the present invention when a closed figure is subdivided by such a filling method. ...Film, 2...Head section, S~6...Blade 0 PI3 figure Atsushi 5 figure 6 figure 7 figure U ■ 1, leather figure 9 figure ji10 figure 'M11 figure figure 12

Claims (2)

[Claims] (1) Using a photobooster with a variable aperture that can expose a straight line and a tapered straight line on the film by moving the nine head parts while irradiating light through a variable aperture, a closed figure can be formed. In a method of exposing the inside of the photoprinter to light in such a way as to cover it up, the closed figure is subdivided into trapezoids or trapezoids and triangles by mutually parallel straight lines with intervals that do not exceed the maximum line width that can be drawn with the photoprinter. , (b) Divide the trapezoid obtained in the above (f) into rectangles or rectangles and right triangles, e) Divide the nine triangles obtained in the above (f) into right triangles, and (b) Divide the above (b) and f. Divide each of the right triangles obtained in step 1 into isosceles triangles, and expose the thus subdivided rectangles (b) and isosceles triangles (a) to light using a photopipe. A method of exposing the inside of a closed figure to fill it in. (2) When the closed figure includes a circular arc, the circular arc may be transformed into a polygon and the inside thereof may be filled in to approximate the polygon. Closed figure IkI + crushing method.