JP2002268808A - Coordinate input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small coordinate input device with high accuracy without increasing cost. SOLUTION: This coordinate input device is provided with a coordinate input area 3 that is of an almost rectangular plane shape and an angle detector including one set of at least two scanning units 2A and 2B for detecting of the incoming direction/unincoming direction of light from a detection object existing at an optional position in the coordinate input area 3, and outputs a coordinates value showing the position of the detection object on the basis of an output of the angle detector. A first part of the detection area of the angle detector has higher angular resolution than the remaining second part does.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device for outputting designated position coordinates.

[0002]

2. Description of the Related Art Conventionally, by inputting coordinates by pointing with a pointing tool or a finger on a flat input surface, a coordinate input used for controlling a connected computer and writing characters and figures. The device is present. As this type of coordinate input device, the direction of arrival of light from the pointing device is detected by installing two sets of angle detectors at both ends of the upper side of the input surface, and the position of the pointing device is determined by the principle of triangulation. Are known to detect As an angle detector, one that scans an input surface using a laser scanner and detects reflected light from an indicator has been put to practical use.

[0003]

In recent years, the brightness of the screen of a large display has been improved, and it has become possible to use it even in a brightly lit environment. In addition, as computers have become widespread, it has been used in conference rooms and the like. The demand for large computer displays to be used is increasing.
In such a use, when a presentation or a meeting using a computer screen is performed, a coordinate input device capable of directly operating the screen is very convenient.

[0004] In particular, like the conventional coordinate input device described above,
In the case where the angle detector is provided at both ends of the upper side of the input surface, the input surface only needs to be flat, and there is an advantage that the cost is not increased even if the size is increased.

However, in the method of obtaining coordinates by triangulation using an angle detector, the detection accuracy varies depending on the position on the input surface, as described later in detail. For this reason,
The resolution of the angle detector needs to be much higher than the required input coordinate resolution, or the angle detector needs to be placed farther away from the input range to narrow the range of use of the detector. For this reason, the cost of the angle detector increases,
In some cases, the arithmetic circuit for calculating the coordinates becomes expensive, high-speed, high-precision, and consumes a large amount of power, or the entire device including the angle detector becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a high-precision and small-sized coordinate input device without increasing costs.

[0007]

A coordinate input device according to the present invention for achieving the above object has the following arrangement.
That is, also preferably, a coordinate input device for outputting a designated position coordinate, wherein a coordinate input area of a substantially rectangular planar shape, and a light input from a detection target existing at an arbitrary position in the coordinate input area. An angle detector including at least a pair of scanning units for detecting an arrival direction / non-arrival direction, and coordinate calculation means for outputting a coordinate value indicating the position based on an output of the angle detector; The number of reflections in the optical path is switched to at least two types so that the first part of the detection range of the angle detector has a higher angular resolution than the remaining second part.

Preferably, the angle detector has a rotating mirror.

Preferably, the angle detector has a vibrating mirror.

[0010] Preferably, the ratio of the angular resolution of the angle detector is determined from a midpoint of a straight line connecting reference points of a pair of scanning units of the angle detector within the coordinate input area. The coordinate resolution near the closest point and the coordinate resolution near the farthest point are selected to be substantially equal.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. << First Embodiment >> FIG. 1 is a diagram showing a schematic configuration of a coordinate input device according to a first embodiment.

The coordinate input device is roughly divided into a pointing device 4 having a retroreflective member provided at the tip thereof, and operating the pointing device 4 within a coordinate inputtable area 3 which is a rectangular plane. And a coordinate detecting unit 1 for detecting the position coordinates and the like.

FIG. 1 shows a computer 5 connected to the coordinate detecting unit 1 and a plane for displaying an image or the above-mentioned position information, etc., with the coordinate inputtable area 3 as a display area, as an output device, in addition to these components. Display device 6
Is described.

The computer 5 may be any one that generates image information such as a broadcast receiver, a video tape recorder, a GPS device, etc., and a control circuit built in those devices has a similar function. It just needs to be fulfilled. In addition, as long as the flat display device 6 displays an image, the present invention can be applied to any display device such as a CRT monitor and a projector, without being a flat plate such as a liquid crystal monitor or a plasma display. Not even. Since the coordinate inputtable area 3 has a planar shape, the display surface is desirably planar, but the present invention is applicable even if the display surface is slightly curved.

The coordinate detecting unit 1 includes two scanning units 2A and 2B which are components of a pair of angle detectors.
And X from these control and output angle detection signals.
Controller 11 for performing coordinate calculation and the like for calculating the Y coordinate
(Detailed in FIG. 4). Then, coordinate information indicating the coordinate position of the pointing tool 4 on the coordinate inputtable area 3 and a control signal corresponding to the state of each switch of the pointing tool 4 are detected, and the information is transmitted from the controller 11 to the computer 5. The light from the pointing device 4 enters through the window 10, and the window 10 is made of an infrared transmitting material to prevent the influence of disturbance light.

The computer 5 performs information processing based on the received coordinate information and the control signal to generate a display image signal, which is transmitted to the flat display device 6 to display an image. .

With this configuration, character information and line drawing information are input on the coordinate inputtable area 3 using the pointing tool 4, and the information is displayed on the flat display device 6, so that it is as if "paper and pencil". ], Information can be input and output, and input operations such as button operation and icon selection can be freely performed.

In the present invention, it is not always necessary to use the display area and the coordinate inputtable area in an overlapping manner, and they may be separately provided. <Detailed Description of Indicator 4> FIG. 2 is a schematic structural diagram of the indicator of the first embodiment.

The pointing device 4 includes a retroreflective member 8 that efficiently reflects infrared light in the incident direction, and an LED that emits infrared light.
And the like, a light emission control unit 42 for driving and controlling the light emission, a power supply unit 44 such as a battery, and two operation switches 43A and 43B. Light emission control unit 42
Generates a drive signal modulated according to the states of the operation switches 43A and 43B to drive the light emitting element 41.

The light emission is turned on and off by a power switch (not shown). This may be controlled by another method, for example, by changing the state of the switches 43A and 43B,
Light emission may be performed only when the power switch is pressed.

Here, the internal structure of the retroreflective member 8 will be described with reference to FIG.

FIG. 3 is a diagram showing the internal structure of the retroreflective member of the first embodiment.

The retroreflective member 8 includes a base film 81
And high-refractive-index spheres 82 are densely arranged in a sheet-like form, which is wound in a cylindrical shape as shown in FIG. In addition, various commercially available products such as a corner cube shape can be applied.

In the first embodiment, the scanning unit 2
Coordinate detection is performed by the light reflected from the retroreflective member 8 of the light coming from A and 2B, and the control signal is detected by the light emitted from the indicator 4.

Returning to the description of FIG.

The operator holds the pointing tool 4 and points its tip to the coordinate inputtable area 3. At this time, the switch 43B
Is arranged at a position where the finger naturally touches. On the other hand, the switch 43A is operated by pressing the tip 46 against the input plate.

The tip portion 46 is preferably made of a material having good slidability and low hardness so as not to damage the input plate (for example, a fiber product such as press felt, a self-lubricating resin such as PTFE, POM, PA, etc.). However, a general resin such as ABS or PMMA may be used, and an appropriate resin may be selected in consideration of the compatibility with the input surface surface).

The transparent cap 45 is made of a transparent resin.
The light from the light emitting element 41 such as an ED is uniformly distributed by the incident surface 45A and the reflecting surface 45B over the entire surface around ± 30 degrees with respect to the surface perpendicular to the longitudinal direction of the pointing device 4 and 360 degrees in the circumferential direction. It is designed to spread. Thereby, even if the pointing tool 4 is slightly tilted during operation, light is surely incident on the coordinate detecting unit 1 and the driving power of the light emitting element 41 can be saved.

The incident surface 45A is a refracting surface having a slightly negative power, and widens the light of the light emitting element 41, thereby expanding the allowable range of the coaxial accuracy between the light emitting element 41 and the transparent cap 45. The reflecting surface 45B has a substantially conical shape, and its ridge line is slightly curved (approximate to a parabola) so that appropriate diffusion characteristics can be obtained in the longitudinal direction. Further, it is designed so that the incident angle becomes total reflection. Of course, a reflective material (such as aluminum) may be deposited or plated, but if total reflection is used,
Cost reduction is planned, and the reflectance is the best.

Here, when the power is turned on, light emission is started, and a coordinate signal is started to be output from the coordinate detection unit 1 by a predetermined process.
A and 43B are OFF states. For this reason, in the coordinate inputtable area 3, only the indication of the position indicated to the operator by the movement of the cursor or the switching of the highlight of the button is performed.

Next, when the switches 43A and 43B are pressed, the light emission control unit 42 modulates the drive signal, and this is detected by the coordinate detection unit 1. That is, when the indicator 4 is pressed, the switch 43A is turned on, so that screen control such as starting input of characters and line drawings and selecting and determining a button can be executed. Also, the switch 43
By pressing B, it is possible to correspond to another function such as calling a menu. Thus, the operator can quickly and accurately draw a character or a figure with one hand or select a button or a menu to perform a light operation.

Although various types of modulation methods can be used as described above, a method generally used for an infrared remote controller or the like is sufficiently applicable. Also, the number of switches may be increased, or a plurality of pointing tools may be prepared and given a unique ID number or attribute information to change the color or thickness of the line or switch to an eraser. It goes without saying that this function can be realized. <Detailed Description of Coordinate Detecting Unit 1> FIG. 4 is a diagram showing the internal configuration of the coordinate detecting unit of the first embodiment.

FIG. 4 shows a state in which the exterior member is removed so that the inside can be seen.

The coordinate detecting unit 1 includes two scanning units 2A, which are components of a pair of angle detectors,
2B and a controller 11 are provided. The scanning units 2A and 2B have (-A, B) and (A, B) as reference points 25A and 25B in XY coordinates with the center of the coordinate inputtable area 3 as the origin, and a reference of 45 degrees with respect to the X axis. It is arranged to detect the tangent (tangent) of counterclockwise angles θ ₁ and θ ₂ from the axis.

The controller 11 includes a scanning unit 2A,
2B, light from the beam light sources 15A, 15B is incident on the scanning units 2A, 2B via the half mirrors 16A, 16B, and conversely,
The return lights from A and 2B are reflected by half mirrors 16A and 16B.
And a control signal detector 19 for detecting light emission of the indicator 4 is provided so as to be transmitted to the light detector 17 for detecting the amount of light by two mirrors 18. In the present embodiment, the half mirrors 16A and 16B are used, and a light amount loss occurs when the light is reflected and transmitted. However, when the light amount is insufficient, a well-known method of polarization conversion is applied. A λ / 4 plate is inserted between the scanner and the scanning unit, the linearly polarized light reflected at 16A and 16B is converted into circularly polarized light, and the circularly polarized light is returned. What is necessary is just to make it transmit.
If there is room for the effective diameter of the return optical path, 16A,
It is also possible to use a total reflection mirror instead of a half mirror for 16B, and detect light that returns along an optical path slightly deviated from the outgoing light and passes around 16A and 16B as return light. <Detailed Description of Scanning Unit> FIGS. 5, 6, and 7 are a perspective view, a top view, and a side view, respectively, of the scanning unit of the first embodiment.

In FIGS. 5, 6, and 7, the support member and the light shielding member are removed so that the inside can be seen.
Further, the scanning unit 2B has the same configuration symmetrical to the scanning unit 2A, so that the description
Perform only for

The scanning unit 2A is composed of two main elements. 20A is three sets of 90-degree V-groove reflecting surfaces 20
1 is an eight-sided rotating mirror, and has a predetermined number of rotations (900 rotations /
Minutes). 21A is two sets of 90 ° V-groove reflecting surfaces 2
11 is a mirror block.

The light beam 291 emitted from the beam light source 15A is incident on the lowermost V-groove reflecting surface of the rotating mirror 20A. FIG. 6A shows a state in which the direction of the incident beam 291 is rotated by one degree with the direction of the incident beam 291 being zero degrees. Thus, the outgoing beam 292 is reflected in two degrees. Rotating mirror 2
With the rotation of 0A, the direction of the output beam 292 changes, but at the phase (10 degrees) shown in FIG.
5A radiation is turned off. Incidentally, FIG.
It is a side view of the state between (a) and FIG.6 (b).

Further, when the rotating mirror 20A rotates to 20 degrees and reaches the phase shown in FIG. 6C, the radiation of the beam light source 15A starts. At this time, the light reflected by the rotating mirror 20A is incident on the mirror block 21A, and is repeatedly reflected on the V-groove reflecting surface 201 of the rotating mirror 20A three times in total, and as shown in FIG. An emission beam 292 is emitted from above. The angle of the mirror block 21A is set as shown in FIG.
When A is 20 degrees, the angle of the output beam 292 is set to 18 degrees.

As described above, since the light is reflected three times by the rotating mirror, the rotating mirror 20A is used between FIGS. 6 (c) and 6 (d).
The output angle changes at an angle that is three times the rotation angle of. FIG.
This relationship is shown as a graph. That is, when the rotation phase of the rotating mirror 20A is 1 degree to 10 degrees, the rotation phase is doubled, that is, 20 degrees to 3 degrees.
At 2 degrees, the output angle changes by a factor of 6 and the output angles 18 degrees to 20 degrees overlap, so that the output beam 292 scans 2 degrees to 90 degrees without any gap, and its detection angle resolution Is less than 20 degrees, it is three times higher. still,
As shown in FIG. 7A and FIG.
When the rotation phase of A is 1 degree to 10 degrees and when the rotation phase is 20 degrees to 32 degrees, the height of the output beam 292 from the input surface differs substantially by the height of the rotating mirror, but a sufficiently thin mirror is used. For example, there is no problem in use due to the spread of the beam. If the mirrors are so thick that the heights need to be adjusted, the height can be easily increased by inserting two 45-degree mirrors into one of the optical paths shown in FIGS. 7A and 7B. It is possible.

In the mirror angle ranges of 10 to 20 degrees and 32 to 45 degrees in FIG. 8, the beam source 15A stops emitting the beam and the beam source 15B emits, so that the scanning unit 2B performs the same scanning. It is. Just because there is a time slightly longer than the required rotation angle of 9 degrees and 12 degrees,
By doing so, without wasting time,
The photodetector 17 can also be used, and there is an advantage that the two scanning lights do not interfere with each other in the coordinate detection unit 1 or in the external coordinate input area.

The light emitted when the pointing tool 4 is in the vicinity of the input surface exits from the scanning units 2A and 2B as a light beam substantially parallel to the input surface, is reflected by the retroreflective member 8, and The light is detected by the photodetector 17 while traveling backward. This detection timing is detected as the direction of the pointing tool, θ ₁ , θ ₂ . <Description of operation of controller 11>
The above-described rotary drive control units of the two rotating mirrors 20A and 20B, the drive control units of the beam light sources 15A and 15B, the coordinate calculation unit that performs coordinate calculation from the output of the photodetector 17 as described later, and the switches of the indicator 4 It comprises a control signal light-receiving element for detecting a state, a signal detection unit, and a communication control unit for communicating coordinates and switch information to an external connection device (for example, a computer 5).

When light is emitted from the indicator 4, a control signal is detected and the state of the switch is detected. As described above, the signals corresponding to θ ₁ and θ ₂ are output from the photodetector 17, and the coordinates are calculated from the signals and communicated to the external connection device (for example, the computer 5) together with the state of the switch. A series of operations is completed. By repeating this, a desired function is achieved.

As described above, when the rotation speed of the rotation mirrors 20A and 20B is 900 rotations / minute and the number of surfaces is 8, 15 × 8 =
Since one scan is completed at 120 Hz, a sufficient detection speed can be obtained. <Description of Coordinate Calculation Method> In FIG. 4, an XY coordinate system having the origin at the center of the coordinate inputtable area 3 is defined. The position of the light emitting element of the indicator 4 is P (x, y), and the scanning unit 2
A, 2B reference points 25A (-A, B), 25B (A,
B), these midpoints are 25C (0, B), the screen width is 2 × a, and the height is 2 × b. In addition, the reference point of each scanning unit is not strictly one point, and it is necessary to correct the reference point depending on the required accuracy. However, in some cases, it can be regarded as one point by appropriate design. Will be explained.

Further, using the reference line of each scanning unit as the coordinate axes U and V, the point P (u, v) is tan θ ₁ = −v / (√2 × A + u), tan θ ₂ = u / (√
2 × A + v).

That is, u = √2 × A × tan θ ₂ × (1-tan θ ₁ ) / (1 + tan θ ₁
× tan θ ₂ ) v = −√2 × A × tan θ ₁ × (1 + tan θ ₂ ) / (1 + tan
θ ₁ × tan θ ₂ ).

On the other hand, x = (uv) / √2, y = −
Since (u + v) / √2-Y0, x = A × (tan θ ₁ + t
anθ ₂ ) / ( ₁ + tan θ ₁ × tan θ ₂ ), y = A × (tan θ ₁ -tan θ ₂ + 2 × tan θ ₁ × tan θ ₂ ) / (1 + tan θ ₁ × tan θ ₂ ) −Y 0 (1) ) Is substituted for the detected tan θ ₁ and tan θ ₂ , x and y are calculated. <Description of Arrangement of Scanning Units> Here, the sensitivity (resolution) indicating the influence on the calculated coordinate values by the arrangement of the scanning units 2A and 2B will be described.

Using equation (1), the sensitivity (Gx, Gy) to the position P (x, y) is given by: Gx = √ ((∂x / ∂ (tan θ ₁ )) ² + (∂x / ∂ ( tan θ ₂ )) ² ), Gy = √ ((∂y / ∂ (tan θ ₁ )) ² + (∂y / ∂ (tan θ ₂ )) ² ) (2) Then, the coordinate inputtable area 3 is a diagonal 55
9A to 9C show the calculation results of the sensitivities Gx and Gy and the combined sensitivity G = √ (Gx ² + Gy ² ) in the case of inch and aspect ratio of 4: 3. Numerical value of each area that is the composition sensitivity (maximum: 1
The unit of (800 to 2000) is mm. Therefore, in the case of the combination sensitivity of 2000, if the range of 45 degrees is divided into 2000 and detected, the resolution becomes 1 mm.

As can be seen from the result, the x coordinate is the point 35A closest to the middle point 25C, and the y coordinate is the point 3A farthest from the middle point 25C.
The sensitivity is maximized at 5B and 35C.

As can be easily guessed from this figure, when the offset amount Y1 in the Y direction of the scanning units 2A and 2B is increased, the maximum value of Gx decreases rapidly and Gy increases slowly.

That is, when the combined sensitivity G is equal to the points 35A and 35
There is Y1 which is the same in B and 35C. Therefore, it can be said that it is optimal to select Y1 in such a manner. Actually, if there is an error in the mounting position, the point 35A is more sensitive. Therefore, when an error is expected, it is needless to say that it is desirable to increase Y1 accordingly.

In the drawing, G (35A) ≒ G (35
B) is the case where Y1 = 78 mm, and at this time, the maximum value of G is 1930.

When the scanning unit of the first embodiment is used, the combined sensitivity G of the point 35A may be higher than the points 35B and 35C. Since the detection accuracy is three times as described above, FIG.
As shown in D, the offset amount Y1 can be set to 23 mm. At this time, the combined sensitivity G is about 5400 at point 35A, and about 18 at points 35B and 35C.
It will be 30.

As described above, the scanning unit can be arranged very close to the input range, and the size of the apparatus can be reduced.

The larger the offset amount X1 of the scanning units 2A and 2B in the X direction (in the first embodiment, it is assumed that the scanning units 2A and 2B are symmetrical, but it can be asymmetric), the greater the distance (the distance between the scanning units 2A and 2B). Is larger), the maximum value of Gx increases rapidly, and the maximum value of Gy decreases slowly. Therefore, it is advantageous to make X1 as small as possible, since the scanning units 2A and 2B can be arranged closer to the coordinate inputtable area 4 with respect to the same maximum value of G, which is advantageous for miniaturization of the apparatus.

However, if X1 is brought close to a negative value, the scanning angles of the scanning units 2A and 2B are reduced from less than 90 degrees to 1
It is necessary to expand all at once to just under 80 degrees, which is not impossible, but not appropriate.

As described above, according to the first embodiment, a set of two angle detectors including two scanning units 2A and 2B is provided for the coordinate inputtable area 3 having a substantially rectangular shape of the coordinate input device. Scanning units 2A and 2B configured to switch the number of reflections in an optical path so as to have at least two types of angular resolution for detecting the direction of a point closest to the midpoint of a line segment connecting reference points with higher resolution than other directions. By doing so, the angle detector can be brought closer to the coordinate inputtable area 3 and the detector can be used also, so that a small, lightweight, low-cost device can be realized. Also, since the amount of coordinate calculation processing hardly increases,
A circuit scale and power consumption can be reduced, and a high-resolution and low-cost coordinate input device can be realized. << Second Embodiment >> In the second embodiment, a configuration in which the detection resolution is doubled in the coordinate input device of the first embodiment will be described.

FIG. 10 is a top view of the scanning unit according to the second embodiment.

The configuration other than the scanning unit is the same as that of the first embodiment, and the description is omitted.

The rotating mirror 20A of the second embodiment is a four-sided mirror, and each surface is a plane. The mirror block 21
A is also a plane mirror, and the light does not offset in the axial direction of the rotating mirror but only moves in the plane. FIG.
(A) is 2 degrees, FIG. 10 (b) is 9 degrees, and FIG. 10 (c) is 1 degree.
FIG. 10D shows the state at 0 degrees, and FIG. 10D shows the state at 28.5 degrees.
The relationship looks like the graph in

That is, in the range of FIGS. 10 (a) and 10 (b), light is emitted as it is, but FIGS.
In the range (d), the light is returned by the mirror block 21A, is reflected by the rotating mirror 20A again, and is emitted. For this reason, the mirror block 21A has its width accurately machined and mounted precisely.

In the case of Embodiment 2, the ratio of the detection resolution is 2
Since the distance is twice as large, a distance of Y1 is required as compared with the first embodiment, but there is an advantage that the rotating mirror 20A may be flat and the cost is low.

In the second embodiment, since the rotating mirror 20A is one for every 90 degrees and the rotation angle required for scanning is less than 30 degrees, the scanning units 2A and 2B can be alternately scanned. Is similar.

As described above, according to the second embodiment, in addition to the effects described in the first embodiment, the present invention has a configuration in which the rotating mirrors 20A and 20B constituting the scanning units 20A and 20B are four-sided mirrors. By realizing the coordinate input device described above, a more inexpensive coordinate input device can be realized.

The rotating mirror 20 according to the first and second embodiments is used.
It goes without saying that the present invention can be applied even if a vibrating mirror is used instead of A. In the case of a vibrating mirror, by applying the present invention, the amplitude of the mirror can be reduced, which is very advantageous in terms of speeding up, downsizing, low power consumption, and the like.

[0066]

As described above, according to the present invention,
A highly accurate and small coordinate input device can be provided without increasing the cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a coordinate input device according to a first embodiment.

FIG. 2 is a schematic structural view of a pointing device according to the first embodiment.

FIG. 3 is a diagram illustrating an internal structure of a retroreflective member according to the first embodiment.

FIG. 4 is a diagram illustrating an internal configuration of a coordinate detection unit according to the first embodiment.

FIG. 5 is a perspective view of a scanning unit according to the first embodiment.

FIG. 6 is a top view of the scanning unit at each rotation angle according to the first embodiment.

FIG. 7 is a side view of the scanning unit according to the first embodiment.

FIG. 8 is a graph showing a relationship between scanning angles of the scanning unit according to the first embodiment.

FIG. 9A is a diagram illustrating a distribution of sensitivity values according to the first embodiment.

FIG. 9B is a diagram illustrating a distribution of sensitivity values according to the first embodiment.

FIG. 9C is a diagram illustrating a distribution of sensitivity values according to the first embodiment.

FIG. 9D is a diagram illustrating a distribution of sensitivity values according to the first embodiment.

FIG. 10 is a cross-sectional view of a scanning unit at each rotation angle according to the second embodiment.

FIG. 11 is a diagram illustrating a graph of a relationship between scanning angles of a scanning unit according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coordinate detection unit 2A, 2B, 2A 'Scanning unit 3 Coordinate input possible area 4 Pointer 6 Flat display device 10 Window 11 Controller 20A, 20B Rotating mirror 21A, 21B Reflection block

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA03 AA19 BB29 FF09 FF65 GG07 GG13 HH04 JJ01 LL13 LL16 LL62 MM16 MM26 NN08 QQ13 QQ26 SS13 5B068 AA01 AA32 BB20 BC02 BC03 BC05 CC09 CC33

Claims (4)

[Claims] 1. A coordinate input device for outputting designated position coordinates, comprising: a coordinate input region having a substantially rectangular planar shape; and an arrival direction of light from a detection target existing at an arbitrary position in the coordinate input region. / At least 2 for detecting the direction of non-arrival
An angle detector including a set of individual scanning units; and a coordinate calculation means for outputting a coordinate value indicating the position based on an output of the angle detector, a first part of a detection range of the angle detector. Wherein the number of reflections in the optical path is switched to at least two so that the angle resolution becomes higher than the remaining second portion. 2. The coordinate input device according to claim 1, wherein the angle detector has a rotating mirror. 3. The coordinate input device according to claim 1, wherein the angle detector has a vibrating mirror. 4. The ratio of the angular resolution of the angle detector is defined as the closest point in the coordinate input area from the middle point of a straight line connecting reference points of a pair of scanning units of the angle detector. 2. The coordinate input device according to claim 1, wherein the coordinate resolution near the point is selected to be substantially equal to the coordinate resolution near the farthest point. 3.