JP2896183B2 - Optical multiple simultaneous two-dimensional coordinate input device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coordinate input device or digitizer for inputting a figure or the like by designating two-dimensional coordinates.

[Conventional technology]

2. Description of the Related Art Conventionally, various types of coordinate input devices for designating two-dimensional coordinates, such as a magnetostrictive system, an electromagnetic induction system, a pressure-sensitive system, and an electrostatic induction system, are known. Each of the conventional coordinate input devices basically has a tablet or input panel that defines a two-dimensional coordinate plane and a coordinate designating unit composed of a combination of a cursor movable on the tablet. The tablet and the cursor are connected by electrical, magnetic or mechanical signals, and by transmitting and receiving these signals, the position of the cursor on the two-dimensional coordinate plane is detected, and input coordinates are designated.

[Problems to be solved by the invention]

However, in the above-described conventional coordinate input device, the input panel requires a special structure according to the type of physical quantity to be used in order to be able to exchange signals with the cursor. It is a so-called dedicated tablet, which has a predetermined dimensional shape structure. Therefore, the plane area of the coordinates input by the conventional device was necessarily limited by the area of the tablet. For this reason, it has not been possible to freely input figures and the like over a wide plane area.

SUMMARY OF THE INVENTION In view of the problems of the conventional two-dimensional coordinate input device, it is a general object of the present invention to provide an optical coordinate input device applicable to a two-dimensional coordinate plane having a wide area.

By the way, when inputting coordinates by manually operating the input device, the range that the operator can cover is limited. In particular, it is inefficient to perform coordinate input alone on a wide two-dimensional coordinate plane covering several meters, which requires a large amount of work.

Therefore, the present invention enables coordinate input by division of labor,
It is a characteristic object of the present invention to provide an optical coordinate input device capable of simultaneously inputting a plurality of coordinate data on a two-dimensional coordinate plane having a wide work area.

[Means to solve the problem]

In order to achieve the above object, the optical plural number 2 according to the present invention
The dimensional coordinate simultaneous input device has a basic configuration shown in FIG. That is, two light reflection type input devices 1 and 2 are used to simultaneously input a plurality of, for example, two sets of coordinate data. These input devices are operated so as to be movable along the two-dimensional coordinate plane 3. The length dimension l and the width dimension h of the coordinate plane 3 can be set freely within a range of several meters, for example. Suppose the first input device or cursor 1 is arranged to enter the coordinates P _1, the second cursor 2 and is arranged to enter the coordinates P _3.

The left light source unit A is mounted on the reference line AB at the fixed point A on the left side of the coordinate plane. The left light source unit A
It emits a light beam that is angularly scanned along the coordinate plane 3 and receives and detects two leftward backward light beams that are sequentially and recursively reflected by the two cursors 1 and 2 and outputs a corresponding detection signal. I do. On the reference line AB, the right light source unit B is placed at the right fixed point B on the coordinate plane 3 while maintaining a predetermined distance 1 from the left light source unit A. The right light source unit B emits a light beam that is angularly scanned along the coordinate plane 3 and receives and detects two right-hand backward light beams that are sequentially and recursively reflected by the cursors 1 and 2. Output a detection signal. Further, at least one auxiliary light source unit C is mounted at a predetermined auxiliary position C on the coordinate plane 3 or an extension plane thereof. The auxiliary light source unit C emits a light beam that is angularly scanned along the coordinate plane 3 and receives and detects two auxiliary backward light beams that are sequentially and recursively reflected by the cursors 1 and 2, respectively. Outputs a detection signal.

The left and right light source units A and B and the auxiliary light source unit C are connected to a calculation unit 4 having an image display 5.
The calculation unit 4 has first means for calculating various angle data based on the detection signals output from each of the light source units A, B, and C. That is, the first means is composed of a group of left backward traveling light beams corresponding to the number of cursors and a group of left declination data (α ₁ and α ₂ ) formed by the reference line, a right backward traveling light beam of the number corresponding to the number of cursors, A group of right declination data (β ₁ and β ₂ ) formed by the reference line AB and difference angle data (Δγ =
γ ₂ −γ ₁ ) is calculated. The calculation unit 4 further includes second means and third means for calculating and determining coordinate data input by each cursor based on the calculated angular data. That is, the second means is a left declination data group (α ₁ and α ₂ )
Left and right argument data pairs (α ₁ β ₁ , α ₁ β ₂ , α) consisting of a mathematical combination between the right and left argument data groups (β ₁ and β ₂ )
Each coordinate data is calculated based on the principle of triangulation based on each of ₂ β ₁ and α ₂ β ₂ ) and the distance data 1 between the left and right light source units. That is coordinate data P ₃ obtained from the polarization angle data pairs alpha ₁ beta _1, the coordinate data P ₄ is obtained from the argument data pairs alpha ₁ beta _2, coordinate data P from the declination data pairs alpha ₂ beta _{1 2} is obtained,
Coordinate data P ₁ is obtained from the argument data pairs alpha ₂ beta _2. These calculated coordinate data P ₁ , P ₂ , P ₃ and P ₄ constitute a coordinate data group including a number exceeding the number of cursors. In the case shown in FIG. 1, the coordinate data P ₁ and P ₃ are actual data, the coordinate data P ₂ and P ₄ are imaginary data. Next, the third means, based on the difference angle data Δγ obtained earlier, makes a pair of real data, that is, actual data, from the coordinate data group (P ₁ P ₂ P ₃ P ₄ ) obtained as described above. specifying the coordinate data P ₁ and P ₃ which is inputted by two cursor. Specifically, for example, one coordinate data pair (P ₁ and P ₃ ) and the other coordinate data pair (P ₁ , P ₂ , P _3, and P ₄₎ that are not located on the same backward luminous flux line from the _four coordinate data P ₁ , P ₂ , P _3, and P ₄ P ₂ and P ₄₎ to create. That is, there is a possibility that these combinations are real data pairs when viewed geometrically. Coordinate data pair P ₁ located on the same backward luminous flux line
When considering the P ₂ left polarized angle data is obtained only one. If such a situation actually occurs, exceptional processing is performed as described later. One coordinate data pair P ₁ P ₃ that matches the actually measured difference angle data Δγ among the created data pair P ₁ P ₃ and P ₂ P ₄ is selected as an actual data pair, and the other coordinate data pair P ₂ P ₄ is an imaginary data pair.

In the above-described example, a case has been described where two sets of coordinate data are simultaneously input using two cursors. The present invention is not limited to this, and a plurality of cursors can be used as appropriate. For example, when three cursors are used, three left argument data and three right argument data are obtained.
There are nine pairs of left and right declination data, and nine pieces of coordinate data are calculated. Of these, three are real data and the rest are imaginary data. In order to specify three actual data, difference angle data is required. In this case, difference angle data viewed from different directions is actually measured and used by two auxiliary light source units.

[Action]

The operation of the present invention will be described with reference to FIG. Generally, the coordinate data (x, y) of the point P is calculated according to the following relational expressions (1) and (2) based on the principle of triangulation using the left and right deviation data α and β and the distance data 1 between the left and right light source units. You.

Therefore, the coordinate data (x ₁ , y ₁ ) of the point P ₁ is obtained by using the pair of left and right declination data α ₂ β ₂ , x ₁ = f _x (l, α ₂ , β ₂ ), y ₁ = f _y
It is calculated as (l, α ₂ , β ₂ ) by the relational expressions (1) and (2). Similarly, the coordinate data of the points P ₂ , P ₃ and P ₄ are calculated by substituting the argument data corresponding to the relational expressions (1) and (2). The results are summarized in Table 1 below.

Next, one pair of calculated coordinate data P ₁ (x ₁ , y ₁ ) P ₃
Which of (x ₃ , y ₃ ) and the other pair P ₂ (x ₂ , y ₂ ) P ₄ (x ₄ , y ₄ ) is an actual data pair is determined based on the actually measured difference angle data Δγ. I do. First, coordinate data of the fixed points A and B where the left and right light source units A and B are arranged and the coordinate data of the fixed point C where the auxiliary light source unit C is arranged are respectively expressed as A (0,0) B (l, 0) C
(X ₀ , y ₀ ). Next, the vectors ▲ ▼,
Define ▲ ▼, ▲ ▼ and ▲ ▼. One vector pair ▲ corresponding to _one data pair P ₁ and P ₃
▼ and ▲ ▼ are determined, and the other vector pair ▲ ▼ and ▲ ▼ is determined corresponding to the other data pair P ₂ , P ₄ . Subsequently, an inner angle θ ₁ between one pair of vectors and an inner angle θ ₂ between the other pairs of vectors are obtained by calculating inner products according to the following relational expressions (3) and (4), respectively.

Finally, the difference angle data Δγ obtained by the actual measurement is compared with the _two interior angle data θ ₁ and θ ₂ obtained by the calculation. First view of the case one of the coordinate data pairs P ₁ and P one since ₃ inner angle data theta ₁ corresponding to equal to the difference between angle data Δγ = γ ₂ -γ ₁ coordinate data pair P ₁ and P ₃ are real Specified as a data pair.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing an optical configuration of the left light source unit A shown in FIG. Note that the optical configuration of the right light source unit B is the same, and the only difference is that the geometrical arrangement of each optical component is symmetrical to that of the left light source unit A, and a detailed description thereof will be omitted. Auxiliary light source unit C
A light source having the same configuration as the left light source unit A can also be used. However, since the auxiliary light source unit C is used only for measuring the difference angle, the optical accuracy may be low.

The left light source unit A has a laser light source 19A for generating an incident light beam along a reference line AB, and a constant angular velocity about a fixed point A for scanning the incident light beam along a coordinate plane given angularly. And a light receiving element 21A for receiving the backward traveling light flux reflected by the cursor and returning to generate a detection signal. As is clear from the figure, the incident light beam emitted from the laser light source 19A passes through the half mirror 22A and travels toward the rotation center A of the rotary reflecting mirror 20A. Here, the incident light beam is scanned at a constant angular velocity and, when coincident with the optical path connecting the fixed point A and the cursor, is sequentially reflected by each cursor, moves backward, returns to the rotary reflecting mirror 20A, reflects there, and proceeds to the half mirror 22A. The backward traveling light beam is separated from the incident light beam by the half mirror 22A, and is received by the light receiving element 21A including a photodiode or the like via a filter. The light receiving element 21A outputs a detection signal in synchronization with the light receiving timing.

The rotary reflecting mirror 20A is rotated at a constant angular velocity by the driving circuit 23A. The drive circuit 23A also outputs a timing pulse for each rotation cycle of the rotary reflecting mirror 20. The timing pulse output from the drive circuit 23A and the detection pulse output from the light receiving element 21A are input to the waveform processing circuit 24A, subjected to waveform processing, and output from the output terminal. The output signal is
Since the detection pulse is output in accordance with the time interval at which the detection pulse is generated based on the timing pulse, the point that the rotary reflecting mirror 20A is rotating at a constant angular velocity eventually represents the above-described left deflection angle data α.

FIG. 3 is a perspective view of a cursor for inputting coordinates used in the present invention. The light reflection type cursor 1 includes a cylindrical light retroreflection member 25 having a central axis and a support member 26 for supporting an ineffective portion of the light retroreflection member 25. Further, inside the cylindrical light retroreflective member 25, an aiming member having a hair cross mark whose intersection point coincides with the axis of the cylinder is mounted. When the cursor 1 is placed with the bottom surface of the support member 26 in contact with the given coordinate plane, the center axis of the cylinder is placed perpendicular to the coordinate plane. In this state, the support member 26
Is grasped, and a coordinate point to be input is designated using the aiming member. Cylindrical retroreflective member 25 parallel to the coordinate plane
After entering the reflecting surface, the incident light beam traveling toward the same optical path is recursively reflected in the same optical path in the opposite direction, and the backward traveling light beam returns toward the light source of the incident light beam. By detecting this backward traveling light beam, designated coordinates that coincide with the central axis of the cylindrical retroreflective member 25 are optically read. The cursor 1 can be used for any coordinate plane as long as it is within the range of the incident light beam from the light source, and does not require any special input panel or tablet as in the related art. In this embodiment, a cursor-type input device is used, but a pen-type input device may be used.

FIG. 4 is a diagram showing an electric circuit configuration of the optical multiple coordinate simultaneous input device according to the present invention. As described above, this coordinate input device has a pair of left and right light source units A and B, an auxiliary light source unit C, and a calculation unit 4, and these parts are electrically connected to each other by a cable. The circuit configuration of the left light source unit A includes a drive circuit 23A for rotating the rotary reflecting mirror 20A at a constant angular velocity and a timing detection circuit 27A connected thereto. The timing detection circuit 27A outputs a predetermined timing every time the rotary reflecting mirror 20A makes one rotation at a predetermined cycle T, for example, the normal line of the rotating reflecting mirror 20A changes to
A timing pulse A1 is output at a timing parallel to the incident light beam from the optical disc. The light receiving element 21A is connected to an amplifier circuit 28A, and the detection signal is amplified and output as a detection pulse A2. The waveform processing circuit 24A is connected to the timing detection circuit 27A and the amplification circuit 28A, and performs waveform processing on the received timing pulse A1 and detection pulse A2 to output an output pulse A3. Since the output pulse A3 is generated in synchronization with the reception of the two leftward backward light beams sequentially returning from the two cursors 1 and 2, the left deflection angles α ₁ and α between the reference line and each backward light beam are generated. Related to _two .

The circuit configuration of the right light source unit B corresponds to the configuration of the left light source unit A described above. That is, it has a driving circuit 23B for driving the rotary reflecting mirror, a timing detection circuit 27B, a light receiving element 21B, an amplification circuit 28B, and a waveform processing circuit 24B. The waveform processing circuit 24B receives the timing pulse B1 and the detection pulse B2, and outputs an output pulse B3. Output pulse
B3 is related to eggplant right argument beta ₁ and beta ₂ and each the reference line of the right backward light beam of the two.

The circuit configuration of the auxiliary light source unit C also corresponds to the configuration of the left and right light source units described above. That is, it has a driving circuit 23C for driving the rotary reflecting mirror, a timing detection circuit 27C, a light receiving element 21C, an amplification circuit 28C, and a waveform processing circuit 24C.
The waveform processing circuit 24C has a timing pulse C1 and a detection pulse C
Input 2 and output output pulse C3. Output pulse C3 is related to the deflection angle gamma ₁ and gamma ₂ formed between each and the reference line of the two auxiliary backward light beam.

Calculator 4 includes a first calculation circuit 29 counts the pulse interval of the output pulse A3 calculates a left declination data alpha ₁ and alpha _2.
Also a second counting circuit 30 counts the pulse interval of the output pulse B3 calculates the right argument data beta ₁ and beta _2. Third
Has a counting circuit 31 counts the pulse interval of the output pulse C3 calculates the auxiliary argument data gamma ₁ and gamma _2. These counting circuits
29, 30 and 31 constitute the first means. The CPU 35 controls these counting circuits 29, 30 and 31 through the interfaces 32, 33 and 34.
And the obtained angle data α ₁ , α ₂ , β ₁ ,
The coordinates specified by the two cursors are calculated based on β ₂ , γ ₁ , and γ ₂ and the distance data 1 between the left and right light source units that has been preset and input. That is, the CPU 35 constitutes the second and third means. An electronic OHP using a CRT 5 or a transmissive liquid crystal display device is connected to the CPU 35, and visually displays the result of the coordinate calculation.

Finally, the operation of the optical coordinate input device according to the present invention will be described. First, the input coordinate plane 3 given as shown in FIG.
The left and right light source units A and B are placed on the left and right sides, and the distance l between the pair of light source units A and B according to the size of the input coordinate plane
(Accurately, the distance between the pair of fixed points A and B)
Enter settings in U35.

Next, two light-reflective cursors 1 and 2 are arranged on a given coordinate plane 3, and their center axes are aligned using an aiming member.
Match to the desired coordinate point P (X, Y).

Subsequently, the pair of left and right light source units A and B are operated, and the incident light beam is angularly scanned to obtain various deflection data. This operation will be described with reference to the timing chart of FIG. First, in the left light source unit A, when the rotary reflecting mirror 20A is rotated at a period T, the timing detection circuit 27A
Outputs a timing pulse A1 with a period T. At this time, the amplifier circuit 28A outputs the detection pulse A2 in synchronization with the light receiving time of the light receiving element 21A. The detection pulse A2 has a large peak followed by two small peaks. The large peak occurs when the rotary reflecting mirror 20A is positioned perpendicular to the incident light beam from the laser light source, is synchronized with the timing pulse A1, and is independent of the backward light beams from the cursors 1 and 2. is there. Suppose that the following two small peaks are synchronized with the timing at which the _two leftward reversing light beams from the cursors 1 and 2 are received by the scanning of the incident light beam, and occur at tα ₁ and tα ₂ hours after the large peak. , The times tα ₁ and tα ₂ are proportionally related to the left deviation data α ₁ and α ₂ to be obtained. Waveform processing circuit
24A performs waveform processing on the timing pulse A1 and the detection pulse A2, and outputs an output pulse A3.

In the other light source unit B, the same incident light beam scanning is performed. In this case, the rotation period and the phase of the rotary reflecting mirror coincide with those of the one light source unit A, so that the same timing pulse B1 is obtained. The detection pulses B2 small peak in t beta ₁ and t beta ₂ hours after the large peak is followed, two right backward light flux came back reflected from the cursor 1 and 2 in these times is received. These timing pulses B1 and the output pulse B3 based on the detected pulse B2 is obtained, the time interval t beta ₁ and t beta ₂ are two related proportionally to the right argument data beta ₁ and beta ₂ of seeking.

Further, in the auxiliary light source unit C, similar incident light beam scanning is performed, and the timing pulse C1 and the detection pulse C2
The output pulse C3 is obtained based on And the pulse interval t
γ ₁ and tγ ₂ are the two sets of auxiliary argument data γ ₁ and γ ₂
Is proportionally related to

Subsequently, the first counting circuit 29 counts the pulse time intervals tα ₁ and tα ₂ of the output pulse A3, and obtains left declination data α ₁ and α ₂ based on the following equation (5).

The second counting circuit 30 calculates the pulse time interval t of the output pulse B3.
β ₁ and tβ ₂ are counted, and right declination data β ₁ and β ₂ are obtained based on the following equation (6).

Further the third counting circuit 31 counts the pulse time interval Tiganma ₁ and Tiganma ₂ output pulse C3, obtain auxiliary deflection angle data gamma ₁ and gamma ₂ based on the following equation (7).

Finally, based on the obtained angle data and the distance data 1 set and input in advance, the CPU 35 executes an algorithm according to the above-mentioned relational expressions (1), (2), (3) and (4) to input the input coordinates P ( X, Y) is calculated and determined.

The calculation and determination procedure will be described in detail with reference to the flowchart of FIG. In step 101, 102 and 103, a left declination data alpha _1, alpha ₂ (however, the α ₂ ≧ α _1), the right argument data beta _1, beta ₂ (however, the β ₂ ≧ β ₁₎
And auxiliary deflection angle data γ ₁ , γ ₂ (however, γ ₂ ≧ γ ₁ )
Is input to the CPU 35.

In step 104, it is determined whether α ₁ = 0. In the case of α ₁ = 0, there are exceptions such as when two cursors are aligned on the line of the backward luminous flux or only one cursor is executing coordinate input. In this case, it is determined at step 105 whether or not β ₁ = 0.
When β ₁ = 0, the input of the cursor is only one point P ₁ , and the coordinate value (x ₁ , y ₁ ) is calculated in step 106. When β ₁ ≠ 0, the two cursors are aligned on the line of the backward luminous flux. In this case step 107, calculates the left light source unit A coordinate value of the input point P ₂ closer to the (x _2, y _2), farther coordinates of the input point P ₁ of not exactly sought A beep sounds and a warning is given. The coordinate data input point P ₁ if saving the cursor in the input point P ₂ is determined in accordance with the warning.

Conversely, in step 104, when α ₁ ≠ 0, step
Proceed to 108. Here, it is determined whether β ₁ = 0. β ₁ =
When zero, the two cursors is determined that aligned on the line of the right backward light beam, the right light source unit coordinates of the input point P ₄ of the closer, in step 109 (x _4, y ₄₎ There coordinate value of the input point P ₁ which is further with the calculated not calculated.
At this time, a warning is issued as in step 107.

When it is determined in step 108 that β ₁ ≠ 0, the process proceeds to step 110, where it is determined whether γ ₁ = 0. γ ₁ = 0
In the case of, the two cursors are aligned on one line of the auxiliary reverse luminous flux, and the coordinate values (x ₁ , y ₁ ) of the two input points P ₁ and P ₃ and ( x ₃ , y ₃ ) is calculated.

Conversely, if it is determined in step 110 that γ ₁ ≠ 0, the process proceeds to step 112, where the difference angle Δγ = | γ ₂ −γ ₁ | between the two auxiliary reversely traveling light beams and its cos data I ₀ = cos Δγ are calculated. calculate. Then, the process proceeds to step 113, where the four coordinate points P ₁ ,
Each coordinate data of the P _2, P ₃ and _{P 4 (x 1, y 1} ), (x 2, y 2),
(X ₃ , y ₃ ) and (x ₄ , y ₄ ) are calculated. In this case, one of the data pair P ₁ P ₃ and the other data pair P ₂ P ₄ is a real data pair and the other is an imaginary data pair.

Subsequently, in step 114, it is determined whether y ₁ > h. In the case of y _1> h, the coordinate point P ₁ is present and data pairs P ₁ P ₃ outside the input area is determined to imaginary. Therefore, in step 115, the coordinate values (x ₂ , y ₂ ) and (x ₄ , y ₄ ) of the actual data pair P ₂ P ₄
Select

In step 114 When the determination is made, the routine proceeds to step 116, where it is determined whether y ₃ <0. When y ₃ <0, the coordinate point P ₃ exists outside the input area, and the coordinate value of the actual data pair P ₂ P ₄ is selected in step 115.

In step 116 When it is determined that it is, the process proceeds to step 117, and it is determined whether x ₂ <0. When x ₂ <0 holds, the coordinate point P ₂ exists outside the input area, and the data pair P ₂ P ₄ is determined to be imaginary. Therefore selecting actual data pair coordinates of P ₁ P ₃ proceeds to step 118 (x _1, y ₁₎ and a (x _3, y _3).

In step 117 In the case of, the routine proceeds to step 119, where it is determined whether or not x ₄ > l. When x ₄ > l holds, it is determined that the coordinate point P ₄ exists outside the input area, and a real data pair (x ₁ , y ₁ ) and (x ₃ , y ₃ ) are similarly selected in step 118.

vice versa , Four calculated coordinate points P ₁ , P ₂ , P ₃ and P ₄
Are all within the input area. Then, the process proceeds to step 120, where the inner product calculation shown in relational expressions (3) and (4) is performed for each data pair P ₁ P ₃ and P ₂ P ₄ . Then, the cos data cos θ ₁ = I ₁ of the inner angle θ ₁ between the vector pair ▲ ▼ and ▲ ▼ and the cos data cos θ ₂ = I ₂ of the inner angle θ ₂ between the vector pair ▲ ▼ and ▲ ▼ are calculated.

Subsequently ID in step _{121 1 = | I 1 -I 0} | and ID ₂ to
= | I ₂ −I ₀ |. Then go to step 122, ID ₁
> Judge whether it is ID ₂ . When ID ₁ > ID ₂ holds,
It is determined that the calculated interior angle θ ₂ is closer to the actually measured difference angle Δγ as compared with the other interior angles θ ₁ , and in step 123, the data pair (x ₂ , y ₂ ) of the coordinate points P ₂ and P ₄ And (x ₄ , y ₄ )
Is selected as actual data. vice versa In the case of, it is determined that the calculated interior angle θ ₁ is closer to the actually measured difference angle Δγ as compared with the other interior angles θ ₂ , and step 12
Data pairs (x ₁ corresponding to the coordinate points P ₁ and P ₃ in 4,
(y ₁ ) and (x ₃ , y ₃ ) are selected as actual data. With the above procedure, the calculation of the coordinate data input simultaneously by the two cursors is completed.

Note that the optical configuration of the light source unit of the embodiment is merely an example, and various modifications are possible. Various modifications of the light reflection type cursor other than the embodiment can be considered.

〔The invention's effect〕

As described above, according to the present invention, the two-dimensional coordinate input device has the light reflection type cursor and the stationary light source unit, and is based on the principle of triangulation by angular scanning of the laser beam. The cursor can be applied to any given coordinate plane, and the light source unit can be freely installed in accordance with the given coordinate plane dimensions. Further, since multiple coordinates can be input simultaneously using a plurality of cursors, there is an effect that workability is excellent.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a coordinate input device, FIG. 2 is an optical configuration diagram of a light source unit of the coordinate input device, FIG. 3 is a perspective view of a coordinate input cursor of the coordinate input device, and FIG. 5 is a timing chart of the coordinate input device circuit, and FIG. 6 is a flowchart of the coordinate input device circuit. 1,2 ... Cursor, 3 ... Coordinate plane 4 ... Calculation unit, 19A ... Laser light source 20A ... Rotating reflector 21A, 21B, 21C ... Light receiving element 22A ... Half mirror 23A, 23B, 23C ... Drive circuit 24A, 24B, 24C Waveform processing circuit 25 Light reflecting member 27A, 27B, 27C Timing detection circuit 29, 30, 31 Count circuit 35 CPU A Left light source unit B …… Right light source unit C …… Auxiliary light source unit

Claims (4)

(57) [Claims] In order to simultaneously input a plurality of coordinate data,
A plurality of light-reflective input devices that are operably moved along a two-dimensional coordinate plane, and emits a light beam that is disposed on a reference line and to the left of the coordinate plane and that is angularly scanned along the coordinate plane. And a left light source unit for receiving and detecting a left backward light flux sequentially reflected by each input device and outputting a corresponding detection signal, and maintaining a predetermined distance from the left light source unit on a reference line to define a coordinate plane. A right light source unit for emitting a light beam which is arranged on the right side and is angularly scanned along a coordinate plane, and which receives and detects a right backward light beam sequentially reflected by each input device and outputs a corresponding detection signal; At least one light beam is arranged at a predetermined auxiliary position on the coordinate plane, emits a light beam that is angularly scanned along the coordinate surface, and receives and detects an auxiliary reverse light beam that is sequentially reflected by each input device. Detection signal An auxiliary light source unit for outputting, based on the output detection signal, a group of leftward deflected data formed by a leftward backward luminous flux according to the number of input devices and a reference line, and a right side according to the number of input devices. A first means for calculating a group of right angle deviation data between the backward traveling light beam and the reference line, and a difference angle data between each auxiliary backward traveling light beam; and a combination between the left angle data group and the right angle data group. Second means for calculating individual coordinate data based on a plurality of left-right deflection data pairs and distance data between the left and right light source units to obtain a group including coordinate data exceeding the number of input devices; and An optical two-dimensional coordinate simultaneous input device comprising: third means for specifying coordinate data actually input by the input device from the coordinate data group. 2. An input device operated independently of each other to simultaneously input two coordinate data, and two auxiliary backward light beams reflected by the two input devices are detected and received. And a single auxiliary light source unit for performing the operation.
2. The optical multiple two-dimensional coordinate simultaneous input device according to 1. 3. The second means calculates four coordinate data from a combination of two left declination data and two right declination data, and the third means calculates the same coordinate data from the calculated four coordinate data. , Two coordinate data pairs not located on the reverse luminous flux line are created, and one coordinate data pair that matches the difference angle data between the two auxiliary reverse luminous fluxes is selected as the two actually input coordinate data. The optical multiple simultaneous two-dimensional coordinate input device according to claim 2. 4. The optical multi-dimensional two-dimensional coordinate simultaneous input device according to claim 3, further comprising means for issuing a warning when the two input devices are aligned on the same backward ray bundle.