JP2990958B2 - How to set up a coordinate reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate reading device such as a layout device or a drawing input device or a coordinate reading device in which correction parameters are stored and mounted. ) Is set as the read coordinate origin, and a setup method of a coordinate reading apparatus for setting up the coordinate read apparatus.

[0002]

2. Description of the Related Art A conventional reading mechanism of a coordinate reading apparatus includes an electromagnetic induction (electrostriction) system, a capacitance system, an optical or magnetic encoder system, and the like. In order to determine the coordinate origin (0,0) later, a desired point on a reading pattern (for example, a manuscript) such as a manuscript placed on a coordinate reading device (the drawing plate), a block copy, or a drawing for reading is read. The coordinate value (x, y) or the coordinate value (x, y) of a desired point on the coordinate reading device (the drawing plate) on which the reading pattern is to be placed is expressed by XY of the coordinate reading device.
It is read as the origin (0,0) by a movable reading index cursor, and the coordinate reading is set up by resetting the counter before use.

For example, when setting up a desired point on a drawing plate as a coordinate origin, a positioning pin bar (two to several pins are erected on an elongated metal plate made of stainless steel) on the drawing plate surface. When the reading pattern (the reading pattern drawn on the original, drawing, or undercut, etc.) is fixed to the pin bar, the pin bar body An origin display sheet having a predetermined mark such as a cross line or a point indicating the origin (0, 0) is attached and fixed, and the XY movable reading index cursor of the coordinate reading device is moved to the predetermined mark. Is visually set by the operator, and the coordinate read by the cursor at that position is input as the origin coordinates (0, 0) for setup.

[0004]

However, even if the pin bar system is firmly fixed on the drawing board, the above-mentioned pin bar system is a visual alignment system, and there is a concern that an operator may cause a reading error.

A correction parameter unique to the coordinate reading apparatus for correcting errors due to bending, distortion, unevenness, and expansion and contraction due to temperature and humidity localized on the guide rail of the XY movable reading index cursor on the drawing plate of the coordinate reading apparatus. There is a concern that a reading error by an operator may occur even in a reading input such as a setup point (parameter reading point) for calling out (set and input as an operator of an arithmetic program) or a coordinate origin, a correction origin (reading origin). There is.

An object of the present invention is to set up a coordinate reading device such as a layout device or a drawing input device, or a coordinate reading device having correction parameters stored therein, by accurately and efficiently inputting the coordinate origin of reading without individual differences between operators. It is in.

According to the present invention, a reference mark 12 serving as a coordinate origin is provided at a desired position in an upper surface area of a drawing board 2 of a coordinate reading apparatus or a reading pattern sheet area fixed on the upper surface of the drawing board 2.
Is set in the vicinity of the read index mark 9 of the read index cursor unit 6 provided movably on the drawing board 2 in the X-axis direction-Y-axis direction. An axis coordinate reading sensor 7 and a linear Y-axis coordinate reading sensor 8 are provided in parallel with the Y-axis direction, and the reading index mark 9 of the reading index cursor section 6 is roughly positioned and fixed near the reference mark 12 to fix the reference mark. 12 display coordinate values (x _m ,
y _m ), the reading index cursor 6 is moved linearly in the X-axis direction and the Y-axis direction, respectively ,
X-axis position of the reference mark 12 by the X-axis coordinate reading sensor 7
Reference value = x ₁ , Reference mark by Y-axis coordinate reading sensor 8
12 and read the Y-axis coordinate value = y ₁
The index mark 9 is known on the X-axis coordinate reading sensor 7 side.
X coordinate value of x = _xs and X axis coordinate reading sensor 7
The read X-axis coordinate value of the reference mark 12 = x ₁ and
More calculates the difference _{(x s -x 1) = x} d, while, before
On the Y-axis coordinate reading sensor 8 side of the reading index mark 9
That known Y-axis coordinate value = the y _s and Y-axis coordinate reading sensor 8
Therefore, the Y-axis coordinate value of the read reference mark 12 =
y ₁ and more the difference _{(y s -y 1) = y} d is calculated, before
The display coordinate value (x _m , y _m ) of the reference mark 12 and the calculated
From the obtained differences x _d and y _d , a secondary difference (x _m −x _d ) = x
₀ , (y _m −y _d ) = y ₀ to calculate the reference mark 1
2. A coordinate reading device set-up, wherein the position coordinates (x ₀ , y ₀ ) in the calculation of 2 are calculated, and the position coordinates (x ₀ , y ₀ ) are set up as the coordinate origin (0, 0). Is the way.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of setting up a coordinate reading apparatus according to the present invention will be described in detail according to an embodiment. FIG. 1 is an overall front view of a coordinate reading apparatus used in the method of the present invention, and FIG. FIG. 5 is a plan view for explaining details of a reading index cursor unit.

In FIG. 1, a coordinate reading apparatus includes a flat drawing board 2 and X-axis guide rails 3 and 3a (upper rail 3 and lower rail 3a) laid on the drawing board 2 in a horizontal X-axis direction.
Along the X-axis guide rails 3 and 3a, a Y-axis direction which is freely movable via a rail follower (free rotating roller) and is orthogonal to the X-axis guide rail is defined as a longitudinal direction. A Y-axis guide rail 4 erected,
A bracket 5 is provided along the axis guide rail 4 via a rail follower (freely rotating rollers). The bracket 5 is freely movable, and a reading index cursor unit 6 is integrally attached to the bracket 5.

On the surface of the drawing board 2 is placed a reference sheet 11 on which, for example, a grid-like vertical and horizontal ruled line (XY grid pattern) is displayed as a dimensional reference. A reference mark 12 representing a reference point at the time of correction input is displayed at a location (for example, on the intersection of the lattice pattern at the lower left corner of the reference sheet 11 placed on the drawing board 2 of FIG. 1 for easy understanding). .

The reference mark 12 serves as a reference for dimensions (a mark having a sufficiently high accuracy as compared with a coordinate reading apparatus, for example, a lattice hattern output by an automatic drawing machine). (Eg, sequentially input intersections of a 100 mm pitch grid pattern) to obtain a parameter for performing a correction operation in order to adjust the accuracy of the coordinate reading device to a reference value thereof.
The fixed point at the time of correction input (for example, the intersection of the lower left corner of the grid pattern) is copied on the drawing board 2.

This is, for example, a transparent film-like reference sheet 11 (not shown) having a visible lattice pattern on the front side.
The reference mark 12 (double-sided adhesive seal with the reference mark 12) is temporarily fixed in advance on the back side of the lower left corner corresponding to the intersection of the lattice pattern via an adhesive, and after the positioning of the reference sheet, It is obtained by removing the release paper on the back surface of the seal, positioning the reference sheet 11 on the drawing board 2, and attaching the seal to the drawing board 2 via the adhesive on the back surface of the seal.

In FIG. 1, 13 is a horizontal axis (X axis).
Length measuring device (for example, X-axis guide rail 3)
The linear encoder and the rotary encoder detect the position of the Y-axis guide rail 4 in the X-axis direction that moves in the X-axis direction along the axis. For example, Y along the Y-axis guide rail 4
The linear encoder and the rotary encoder detect the position of the bracket 5 moving in the axial direction in the Y-axis direction).

The above-mentioned bracket 5 is provided with a reading index cursor section 6 integrally therewith. The cursor section 6 slides on the surface of the drawing board 2 while contacting with or sliding on the surface. It is possible to move freely within the XY plane with a slight separation. Reference numeral 15 denotes a leg supporting the drawing board 2 at a predetermined height and holding the drawing board 2 surface at a horizontal or predetermined inclination angle.

FIG. 2 is a plan view of the reading index cursor portion 6 movably attached to the surface of the drawing plate 2 and the reference mark 12 set and displayed at a desired position on the surface of the drawing plate 2 according to the embodiment. The reading index cursor section 6 is integrally attached to the front end of the bracket 5 movable along the Y-axis guide rail 4 on the surface of the drawing board 2.

The cursor section 6 includes a transparent plate 6a made of glass or plastic, and a reading index mark 9 (cursor) such as a cross line is visually displayed at a substantially central portion of the transparent plate 6a as a support. ing.

As shown in one embodiment of FIG. 2, a linear CCD sensor or the like is integrally provided on the read index cursor section 6 near the read index mark 9 in parallel with the X-axis (lateral) direction. The used one-axis X-axis coordinate reading sensor 7 is mounted. A one-line Y-axis coordinate reading sensor 8 using a linear CCD sensor or the like is mounted on the reading index cursor portion 6 near the reading index mark 9 in parallel with the Y-axis (vertical) direction. ing.

In the present invention, the X-axis coordinate reading sensor 7 is moved in the Y-axis direction to pass over the reference mark 12, and the Y-axis coordinate reading sensor 8 is moved in the X-axis direction to move the reference mark 12 The relative position between the cursor 9 and the reference mark 12 is recognized by passing the cursor upward.

The coordinate readings = x _s of said read sensor 7 at the location 7a of intersection of the Y-axis direction extension 9y of the X-axis coordinate reading sensor 7 and read the index mark 9 Yes set as known, also, A point 8a where the Y-axis coordinate reading sensor 8 intersects with the X-axis direction extension line 9x of the reading index mark 9
The coordinate read value of the reading sensor 8 at = y _s is set as known.

In FIG. 2, the X-axis coordinate reading sensor 7 and the Y-axis coordinate reading sensor 8 are mounted one line each on the lower side and the left side with respect to the reading index mark 9, respectively. For example, one line may be mounted above and to the right of the read index mark 9 respectively.

Alternatively, an X-axis coordinate reading sensor 7 for one line is mounted on both the upper and lower sides of the reading index mark 9, and a Y-axis coordinate reading sensor 8 for one line is mounted on both the left and right sides. So that either one of the upper and lower X-axis coordinate reading sensors 7 and 7 and the left and right Y-axis coordinate reading sensors 8 and 8 can be switched and used as a reading sensor. Good.

The method of setting up the coordinate reading device of the present invention is performed by using the above-described X-axis coordinate reading sensor 7 and Y-axis coordinate reading sensor 8 mounted on the reading index cursor section 6 of the coordinate reading device. It is characterized by the following.

First, a reference mark 12 serving as a coordinate origin is set in a desired position in an upper surface area of the drawing plate 2 of the coordinate reading apparatus of FIG. 1 or in a reading pattern sheet area fixed to the upper surface of the drawing plate 2.

Next, the reading index mark 9 (cursor) of the reading index cursor section 6 is roughly positioned near the reference mark 12.

Next, as shown in FIG. 2, the read index cursor section 6 is divided into an X-axis direction and a Y-axis direction, and each is linearly moved to be integrally provided near the read index mark 9 (cursor). Then, the X-axis coordinate reading sensor 7 and the Y-axis coordinate reading sensor 8
The axial coordinate reading sensor 7 reads the X coordinate value x _a reference mark 12 at the time of passing through the sensor 7 lower, whereas, when the reference mark 12 of the Y-axis coordinate reading sensor 8 through the sensor 8 lower reading of the Y-coordinate value y _a.

Thus, the position coordinate of the center of the cursor 9 (the intersection of the cross cursor 9) is (x, y), the distance in the X-axis direction from the sensors 7, 8 to the intersection of the cursor 9 and the distance in the Y-axis direction. Are x _c and y _c respectively, x =
x _a + x _c, also be expressed as y = y _a + y _c, the cursor 9
Can be set up at a position where the position coordinate (x, y) of the center of the reference mark is adjusted to the position of the reference mark 12. That is, a point such that _{x a = -x c y a =} -y c as a setup point in the current coordinate system, automatically position coordinates of the center of the cursor 9 (x, y) = ( - x c _, −y _c ).

FIGS. 3 to 6 show an example of a specific procedure of the method of setting up the coordinate reading apparatus of the present invention in a case where the reference mark 12 is set at the lower left corner of the drawing plate 2 shown in FIG.
Will be described in the following order.

First, as shown in FIG. 3, a reference mark 12 is set at the lower left corner of the drawing board 2. The reference mark 12
The reference mark 12 (both sides on which the reference mark 12 is applied) is provided on the back side corresponding to the intersection of the lattice pattern at the lower left corner of the transparent film-like reference sheet 11 (not shown) having the visible lattice pattern applied on the front side. The adhesive sheet is temporarily fixed with an adhesive, and after the positioning of the reference sheet, the release paper on the back surface of the seal is removed, the reference sheet 11 is positioned on the drawing board 2, and the seal is placed on the back surface of the seal. Is pasted on the drawing board 2 via the adhesive of the above (2) and is visually displayed.

Next, in FIG. 4, the read index cursor section 6 is moved by distances Xa and Ya in the X-axis and Y-axis directions, respectively, so that the read index mark 9 of the cursor section 6 is visually compared to the reference mark 12. positioned in the vicinity of, kept stationary in that position, the coordinate value (x _m, y _m), and the coordinate reading the deployed read coordinate data out indicator 16 to output the displayed coordinate values to the apparatus at its current position (x _m , y _m ), X = x _m , Y =
Read y _m . In this case, the coordinate values (x _m , y _m ) output and displayed in this case are numerical values output and displayed based on the coordinate origin (0,0) set up before new setup. The reading index mark 9
When the reference mark 12 is positioned approximately in the vicinity of the reference mark 12, the reading index mark 9 may be aligned just above the reference mark 12.

Next, in FIG. 5, with the movement of the reading index cursor section 6 in the X-axis direction fixed,
And the Y-axis direction by slightly moving distance width Y _b direction operation,
Alternatively, the X-axis coordinate reading sensor 7 intersects (orthogonally) with the reference mark 12 above the reference mark 12 by reciprocating operation, and the X-axis coordinate reading sensor 7 reads the X-axis coordinate value = x ₁ of the reference mark 12. , Read index mark 9 again
Is positioned approximately near the reference mark 12.

Next, in FIG. 6, with the movement of the read index cursor section 6 in the Y-axis direction fixed,
Is operated in one direction by a slight movement distance width _Xb in the X-axis direction,
Alternatively, the Y-axis coordinate reading sensor 8 intersects (orthogonally) with the reference mark 12 above the reference mark 12 by reciprocating operation, and the Y-axis coordinate reading sensor 8 reads the Y-axis coordinate value = y ₁ of the reference mark 12. .

Next, a known X-axis coordinate value of one of the aforementioned read index marks 9 on the X-axis coordinate reading sensor 7 side =
More and x _s, and X-axis coordinate value = x ₁ of the reference mark 12 is read by the X-axis coordinate reading sensor 7, it calculates a difference x _s -x _1, calculate the x _s -x ₁ = x _d I do.
(See Fig. 7)

The Y of the other read index mark 9
Known Y-axis coordinate value on the axis coordinate reading sensor 8 side = y
_s and the Y-axis coordinate value of the reference mark 12 read by the Y-axis coordinate reading sensor 8 = y ₁ , the difference y _s
It calculates the -y _1, calculates the y _s -y ₁ = y _d. (FIG. 7
reference)

Next, the coordinate values (x _m , x _m ) output and displayed on the output display 16 at the time when the above-mentioned read index mark 9 is positioned and stopped approximately in the vicinity of the reference mark 12.
y _m ) and the calculated differences x _d , y _d are used to calculate back the coordinate values in the calculation of the reference mark 12.

That is, from the coordinate values (x _m , y _m ) of the reference mark 12 output and displayed by the output display 16 and the calculated differences x _d , y _d , x _m −x _d = x ₀ , y _m -y
By calculating _d = y ₀ , the calculated coordinate value (x ₀ , y ₀ ) of the reference mark 12 is calculated. On the basis of the calculated coordinate values (x ₀ , y ₀ ), the program is automatically processed and set up by the programmable controller provided in the main body of the coordinate reading apparatus. The procedure is as follows.

As the procedure, for example, while moving the reading index cursor section 6 by manual operation, the coordinate values of the reading index mark 9 displayed on the output display 16 are X = x ₀ , Y = y _0. After being moved to the position where the coordinate value is displayed, the reading index cursor unit 6 is stopped.

Subsequently, while the reading index cursor section 6 is kept still, the reading coordinate value reset key button of the operation keyboard 17 is pressed, and the calculated coordinate value (x ₀ , y ₀ ) of the reference mark 12 is calculated. By resetting to (0, 0), the position coordinates of the reference mark 12 are set to the read origin coordinates (0, 0).
0) to end the setup of the coordinate reading apparatus of the present invention.

After the setup is completed, the reading index cursor section 6 which can be freely moved on the drawing board 2 manually as the reading coordinate origin (0, 0) of the reference mark 12 is set.
This is for reading the position coordinates of the read index mark 9 provided in the above.

FIG. 8 shows an example of the shape of the reference mark 12 used in the present invention.
Is a donut-shaped dot, (c) is a square-shaped dot having sides parallel to the X-axis and Y-axis directions, and (d) is a diagonal direction of the X-axis.
It is a square dot parallel to the Y-axis direction, and the shape of the reference mark 12 is not particularly limited, but the position coordinate value of the reference mark 12 crossing the X-axis coordinate reading sensor 7 and the Y-axis coordinate reading sensor 8. Is desirably a shape that can be read relatively accurately.

When the reference mark 12 shown in FIGS. 8A and 8D is read by the X-axis coordinate reading sensor 7 and the Y-axis coordinate reading sensor 8, the respective marks output from the sensors 7 and 8 are read. The signal amount peak of the read signal is set as each read coordinate value (x ₁ , y ₁ ).

When the donut-shaped reference mark 12 shown in FIG. 8B is read by the X-axis coordinate reading sensor 7 and the Y-axis coordinate reading sensor 8, the sensors 7, 8 are used.
The middle of the two signal amount peaks of the respective read signals output from is set as the respective read coordinate values (x ₁ , y ₁ ).

[0042]

The method for setting up the coordinate reading apparatus according to the present invention is as follows.
The reading index mark 9 of the reading index cursor portion 6 that can freely move on the drawing board 2 of the coordinate reading device is set in the upper surface area of the drawing board 2.
Alternatively, after the positioning of the reading index cursor section 6 in the X-axis direction and the Y-axis direction, the positioning is performed in the vicinity of the reference mark 12 set at a desired position in the reading pattern sheet area fixed to the upper surface of the drawing board 2. Te by linear movement operation, respectively, the same to be able to read calculating the coordinate differential x _d, y _d of the reference mark 12 by the X-axis coordinate reading sensor 7 and the Y-axis coordinate reading sensor 8 mounted integrally Therefore, the position coordinates (x
₀ , y ₀ ) can be calculated on the basis of the coordinate value difference.

Assuming that the calculated position coordinates (x ₀ , y ₀ ) of the reference mark 12 are x ₀ = 0, y ₀ = 0, the X-axis coordinate reading means 13 and the Y-axis coordinate reading means 14 of the apparatus main body are used. The coordinate origin (0, 0) can be set up by inputting and setting to the control means (controller program). In the setup in which the reference mark 12 is used as the coordinate origin, the read index mark 9 is set to the reference mark 12. On the other hand, since there is no need to visually read the image at the matching position, no reading error occurs.

[0044]

The method of setting up the coordinate reading apparatus according to the present invention is not limited to the setup in the coordinate reading apparatus for inputting layout information used in printing plate making, but also to the CA.
It can also be used for setup in reading the drawing position coordinates on the drawing board in the drawing pattern input device of D, reads the position coordinates of the reference mark set at the desired position on the drawing board, and coordinates the read position coordinates When setting up as the origin, the reading position coordinates of the fiducial mark can be accurately calculated by calculation, rather than the visual reading of the operator as in the related art, and the reading error of the operator in reading the fiducial mark at the time of setup. Prevents reading and individual differences, and allows accurate and efficient setup.

Further, correction parameters for eliminating the effects of bending, distortion, unevenness, and temperature / humidity localized on the drawing board on which the drawing pattern of the coordinate reading device is mounted and the XY rail for moving the reading index cursor are set. In a coordinate reading apparatus having a function of storing, a coordinate origin for correction can be accurately and efficiently input and set, and setup can be performed. In addition, a plurality of reference marks (read points) to be read for setup are provided. Even if there is, the position coordinates of each reading point can be calculated accurately and efficiently in calculation, and accurate and efficient setup without reading errors can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of a coordinate reading device main body for explaining an embodiment of a method for setting up a coordinate reading device of the present invention.

FIG. 2 is a front view of a reading index cursor section of the coordinate reading device main body for explaining one embodiment of a method of setting up the coordinate reading device of the present invention.

FIG. 3 is a plan view of a coordinate reading device main body in which a reference mark is set on a drawing plate in one embodiment of the method of setting up the coordinate reading device of the present invention.

FIG. 4 is a plan view of the main body of the coordinate reading device illustrating a state in which the read index cursor is positioned approximately near the reference mark in one embodiment of the method of setting up the coordinate reading device of the present invention.

In one embodiment of how to set up the coordinate reading device of the present invention; FIG, the reading index cursor section, after positioning roughly in the vicinity of the reference mark, moving the indicator cursor portion preparative said read only movement width Y _b, X FIG. 4 is a plan view of a main body of the coordinate reading device for explaining a state in which a reference mark is read by an axis coordinate reading sensor.

FIG. 6 shows an embodiment of the method of setting up the coordinate reading apparatus according to the present invention, in which after the reading index cursor section is positioned approximately in the vicinity of the reference mark, the reading index cursor section is moved by a movement width _Xb , and Y FIG. 4 is a plan view of a main body of the coordinate reading device for explaining a state in which a reference mark is read by an axis coordinate reading sensor.

FIG. 7 is a diagram illustrating an example of a method of setting up a coordinate reading apparatus according to an embodiment of the present invention;
FIG. 9 is a front view of a reading index cursor unit for explaining a difference.

FIG. 8A is a plan view illustrating an example of a reference mark used in the setup method of the coordinate reading device of the present invention. (B) It is a top view explaining an example of the reference mark used in the setup method of the coordinate reading device of the present invention. (C) It is a top view explaining an example of the reference mark used in the setup method of the coordinate reading device of the present invention. (D) It is a top view explaining an example of the reference mark used in the setup method of the coordinate reading device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coordinate reading device 2 ... Drawing board 3 ... X-axis guide rail
4 Y-axis guide rail 5 Bracket 6 Reading index cursor 6a Transparent plate 7 X-axis coordinate reading sensor 7a Intersection with extension line equivalent to reference mark 8 Y-axis coordinate reading sensor 8a Reference mark Intersection with the extension equivalent line 9 ... Reading index mark 9x ... Extension equivalent line 9y ... Extension equivalent line 11 ... Reference sheet 12 ... Reference mark (reference point) 13 ... X axis coordinate reading means 14 ... Y axis coordinate reading means 15 ... leg 16 ... coordinate value output display 17 ... input setting keyboard X _b ... read movement width Y _b ...
Reading movement width x _s ... reference mark known coordinate value y _s ... reference mark known coordinate value x ₁ ... X-axis coordinate value of reference mark y ₁ ... Y of reference mark
Axis coordinate value x _d ... difference y _d ... difference

Claims (1)

(57) [Claims] 1. A reference mark 12 serving as a coordinate origin is set at a desired position in an upper surface area of a drawing plate 2 of a coordinate reading apparatus or in a reading pattern sheet area fixed on the upper surface of the drawing plate 2,
An X-axis coordinate reading sensor that is linearly parallel to the X-axis direction and integrally near the reading index mark 9 of the reading index cursor unit 6 provided movably on the drawing board 2 in the X-axis direction-Y-axis direction. 7 and a linear Y-axis coordinate reading sensor 8 parallel to the Y-axis direction, and the reading index mark 9 of the reading index cursor section 6 is roughly positioned and fixed near the reference mark 12.
To read the display coordinate values (x _m , y _m ) of the reference mark 12
After the reading , the reading index cursor section 6 is moved linearly in the X-axis direction and the Y-axis direction to read the X-axis coordinate.
The X-axis coordinate value of the reference mark 12 by the sensor 7 = x ₁ ,
Y-axis coordinate of the reference mark 12 by the Y-axis coordinate reading sensor 8
Reading target value = y _1, respectively, the read index mark 9
X-axis coordinate value on the X-axis coordinate reading sensor 7 side
= Read by x _s and X-axis coordinate reading sensor 7
X-axis coordinate value of the reference mark 12 = x ₁ and more the difference
(X _s -x ₁ ) = x _d , while the read index
Known Y-axis on the Y-axis coordinate reading sensor 8 side of the mark 9
Reading the coordinate value = y _s and Y-axis coordinate reading sensor 8
Was Y-axis coordinate value of the reference mark 12 = y ₁ more Resona
Calculating a difference _{(y s -y 1) = y} d, wherein the reference mark
Twelve display coordinate values (x _m , y _m ) and calculated difference
x _d , y _d and second order difference (x _m −x _d ) = x ₀ , (y
_m -y _d) = by calculating y ₀ calculates the position coordinates on the calculation of the reference mark 12 (x _0, y _0), the coordinates (x _0, y ₀₎ of the coordinate origin (0, 0) A setup method for a coordinate reading device, wherein the setup is performed as 0).