JPH0362159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an underlay that allows straight lines to be drawn on a document placed thereon without using a ruler.

(Prior Art) Conventionally, in order to draw a straight line on a document, or to draw parallel or perpendicular lines to the straight line,
A ruler or drafter is used.

However, drawing a straight line using such a ruler is troublesome, and especially when drawing parallel lines or perpendicular lines, it is necessary to use two triangular rulers. Also, when using a drafter, it is more efficient than a regular ruler, but the equipment is large and it is not possible to draw straight lines easily.

(Object of the Invention) In view of the above circumstances, an object of the present invention is to provide an underlay that allows straight lines such as orthogonal lines and parallel lines to be easily drawn on a manuscript.

(Structure of the Invention) The first gist of the present invention is that by arranging a large number of tapered protrusions with octagonal bottoms in the vertical and horizontal directions on the surface of a flat plate, the tip of a writing instrument can be inserted between these protrusions. A lattice-shaped guide groove is formed for guiding. The second gist is that by arranging a large number of tapered protrusions with octagonal bottoms in the vertical and horizontal directions on the surface of a flat plate made of a transparent material, the tip of a writing instrument is guided between these protrusions. A lattice-shaped guide groove is formed, and an angle display scale indicating the angle at which the document is placed is provided on the back surface of the flat plate or on the intermediate layer.

Place the original on the underlay constructed in this way,
If you scan the writing instrument from above the document, the tip of the writing instrument will be guided by the guide groove with the document interposed between the tip of the writing instrument and the guide groove, thereby creating parallel and orthogonal lines on the document. It is possible to draw straight lines such as the above, and furthermore, it is possible to draw diagonal lines that are inclined at 45 degrees with respect to each of the above lines relatively smoothly.

(Example) A first example of the present invention will be described based on FIGS. 1 to 5.

FIG. 1 shows an underlay 1 formed of a flat plate made of resin. On the surface of this flat plate, a large number of square pyramid-shaped protrusions 2 as shown in FIGS. A guide groove 3 is formed. The guide groove 3 is formed to guide the tip of a ballpoint pen 4 (writing instrument) as shown in FIG.

In such a configuration, as shown in FIG. 4, the original 5 is placed on the underlay 1 and
If the ballpoint pen 4 is scanned from above, the tip of the ballpoint pen 4 will be guided to the guide groove 3 with the original 5 interposed between the tip of the ballpoint pen 4 and the guide groove 3. Parallel and orthogonal lines can be drawn above as shown in FIG.

Note that the writing instrument used must be hard and its tip must fit into the guide groove 3, and the ballpoint pen 4 as described above is optimal. For example, this ballpoint pen 4 can be said to be optimal. For example, in the case of this ballpoint pen 4, the ball diameter is generally about 0.5 mm, but the guide groove 3 is approximately the same size as this ball diameter.
, it actually becomes the structure where it is easiest to draw a straight line.

The bottom shape of the protrusion 2 may be square or rectangular. Furthermore, if the four corners are formed at 45° and the bottom surface is shaped like an octagon as shown in FIG. 6, a 45° diagonal line can be drawn relatively smoothly as shown by the arrow in the figure.

Next, a second embodiment will be described based on FIGS. 7 to 10.

Here, the underlay 1' is made of transparent resin, and the same protrusions 2 and guide grooves 3 as described above are formed on this underlay 1'. Further, a display paper 7 on which an angle display scale 6 similar to that of a general protractor is printed is pasted to the bottom surface, and the display scale 6 is constructed so that it can be seen through from the front side of the underlay 1'.

Therefore, align the leading edge of the original 5 with this scale 6,
If you hold the original 5 in this state and draw a straight line using the guide groove 3 as in the first embodiment (Fig. 9), you can draw a straight line at a predetermined angle with respect to the original 5. .

In addition, as shown in FIG. 10, the display paper 7
A straight line with a certain angle can be drawn in the same way by placing the scale 6 inside the intermediate layer of the underlay 1', or by directly printing the scale 6 on the back side of the underlay 1'. In addition, a guide groove 3 is provided on this display paper 7.
If you print the grid in the same direction as the
Positioning of the original becomes easier.

Since the present invention has the above functions,
In addition to drawings such as floor plans and perspective drawings, it is suitable for drawing various figures such as schematic maps, tables, and maze puzzles. When writing letters, it has the advantage of being able to write distinctive angular characters, as well as having the same shape as the font drawn by the computer on the display. Furthermore, if the back side is formed smooth, it can of course be used as a general underlay, so in this case, both sides may be used depending on the need.

(Effects of the Invention) As described above, the present invention forms a lattice-shaped guide groove for guiding the tip of a writing instrument by arranging a large number of protrusions each having an octagonal bottom on the surface of a flat plate. The effect of being able to easily draw straight lines such as parallel lines and perpendicular lines without using instruments such as rulers and drafters, as well as relatively smoothly drawing diagonal lines that are inclined at 45 degrees to each of the above lines. There is.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the underlay in the first embodiment of the present invention, FIG. 2 is a plan view of the protrusions and guide grooves of the underlay, FIG. 3 is a cross-sectional view taken along the - line in FIG. 2, and FIG. FIG. 5 is a plan view showing straight lines drawn by the underlay, FIG. 6 is a plan view of a protrusion with an octagonal bottom, and FIG. 7 is the underlay in the second embodiment. 8 is a sectional view taken along the line -- in FIG. 7, FIG. 9 is a plan view showing the use of the underlay, and FIG. 10 is a sectional view of the underlay with display paper provided as an intermediate layer. 1, 1'...underlayment, 2...protrusion, 3...guide groove,
4...Ballpoint pen (writing instrument), 5...Manuscript, 6...
...Angle display scale.

Claims (1)

[Scope of Claims] 1. A lattice-like guide groove for guiding the tip of a writing instrument between these protrusions by arranging a large number of tapered protrusions with octagonal bottoms in the vertical and horizontal directions on the surface of a flat plate. An underlay that allows you to draw straight lines without using a ruler. 2. By arranging a large number of tapered protrusions with octagonal bottoms in the vertical and horizontal directions on the surface of a flat plate made of a transparent material, a lattice-shaped guide groove for guiding the tip of a writing instrument is created between these protrusions. An underlay with which a straight line can be drawn without using a ruler, characterized in that an angle display scale is provided on the back surface of the flat plate or on the intermediate layer to indicate the angle at which the document is placed.