JP2000293312A - Information input/detection/display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shape to which a display part is suitable from the viewpoint of human engineering and to increase information quantity to be handled in an optical information input/detection/display device. SOLUTION: This device comprises plural light emitting/receiving means and detects the two-dimensional coordinates of a light interrupting means according to the existence/absence of the light emitting means in optical paths of the light emitting/receiving means. The display surface 4021 of a display member 402 showing information at a prescribed position on the basis of inputted/ detected coordinates is combined with the coordinates input/detection surface 4011 of a coordinates input/detection member 401 so that they can be almost parallel. The areas of the surfaces 4011 and 4021 are made horizontally long in accordance with the angle of visibility of a healthy person M2 and a vertical length is made to >=1.2 m.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input / detection device, and more particularly to a personal computer or the like for detecting a coordinate position designated by a pointing member such as a pen or a finger for inputting or selecting information. The present invention relates to a so-called touch panel type coordinate input / detection device. This coordinate input / detection device is used as an information input / detection / display device integrated with an electronic blackboard and a large display.

[0002]

2. Description of the Related Art Conventionally, a coordinate input / detection device detects an electric change by electrostatic or electromagnetic induction when a coordinate input surface is pressed with a pen or when the pen approaches a coordinate input surface. There is. As another method, there is an ultrasonic touch panel coordinate input / detection device as disclosed in JP-A-61-239322. Simply put, the surface acoustic waves transmitted onto the panel are attenuated by touching the panel,
The position is detected.

[0003]

However, in the method of detecting a coordinate position by electrostatic or electromagnetic induction, the coordinate input surface has an electric switch function, so that the manufacturing cost is high, and the pen and the main body are connected. There was a difficulty in operability because a cable was required.

[0004] In addition, since the ultrasonic method is based on the premise of finger input, when a pen input is made with a material (soft and elastic) having absorption on the panel, a straight line is drawn. At this point, stable attenuation is obtained, but when the pen is moved, sufficient contact is not obtained and the straight line is broken. Therefore, in order to obtain sufficient contact, the pen is pressed with excessive force. Then, as the pen moves,
Due to the elasticity of the pen, it receives stress and generates strain, and a force to return during movement acts. For this reason, once you try to draw a curve at the time of pen input, the force to hold down the pen is weakened and the force to restore distortion is excellent, so it will not return and stable attenuation can be obtained,
It is determined that the input has been interrupted. For this reason, there is a problem that reliability cannot be ensured as pen input.

[0005] However, regarding the problems of the prior art as described above, the applicant of the present invention has previously filed Japanese Patent Application No. 10-12 / 1998.
No. 7035 and Japanese Patent Application Laid-Open
No. 99, Japanese Unexamined Patent Publication No.
An optical coordinate input / detection device represented by Japanese Patent Application No. 319501, an optical coordinate input / detection device typified by the present applicant as Japanese Patent Application No. 10-230960, or an image input means is used. A touch panel type coordinate input / detection device can be realized with a relatively simple configuration, which is solved by the coordinate detection device.

In recent years, with the spread of personal computers and the like, such a coordinate detection device has been positioned as a powerful tool for inputting and selecting information, and has been studied diligently in addition to those disclosed in the above publications. However, there are many issues that need to be solved for full-scale practical application.

(Object of the Invention) The present invention relates to such an optical information input / detection / display device. First, from the ergonomic point of view, a display portion of such an apparatus is suitable. Proposal of a shape, secondly, to increase the amount of information handled by this device from an ergonomic point of view, and thirdly, to guarantee the function of this device while securing the first and second objects. It is done for the purpose of doing.

[0008]

In order to achieve the above object, the present invention firstly comprises a plurality of light emitting means and a plurality of light receiving means, and a light blocking means in the light path for light emission / light reception. A coordinate input / detection device for detecting the two-dimensional coordinates of the light blocking means, and a display device for displaying information at a predetermined position based on the coordinates input / detected by the coordinate input / detection device. In an information input / detection / display device in which a coordinate input / detection surface of the coordinate input / detection device and a display surface of the display device are combined so as to be substantially parallel, an area of the coordinate input / detection surface and the display surface Is
It is characterized by having a horizontal length in accordance with the viewing angle of a healthy person and a vertical length of not less than 1.2 m.

Secondly, it comprises a plurality of light-emitting means and a plurality of light-receiving means, and a coordinate input / detection means for detecting two-dimensional coordinates of the light-shielding means depending on the presence or absence of a light-shielding means in an optical path for light emission / reception. A detection device and a display device for displaying information at a predetermined position based on the coordinates input / detected by the coordinate input / detection device, a coordinate input / detection surface of the coordinate input / detection device and a display of the display device In an information input / detection / display device combined so that the surface is substantially parallel,
The coordinate input / detection surface and the display surface are arranged so as to be perpendicular or approximately perpendicular to the floor, and the detection surface and the display surface have a wider area in the horizontal direction than in the vertical direction, and Is set to be 1.2 m or more.

Third, the first and second information input / detection / display devices are characterized in that the detection surface and the display surface are substantially flat.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the principle of a first example of an optical coordinate input / detection device to which the present invention is applied will be described. FIG. 1 is a diagram showing an example of an optical coordinate input / detection device to which the present invention is applied. Coordinate input area 3
Has a square shape, and may be a display surface for electronically displaying an image or a whiteboard written with a pen such as a marker. It is assumed that the user touches the coordinate input area 3 with pointing means such as a user's finger, pen, or support rod made of an optically opaque material. It is an object of such an optical coordinate input device to detect the coordinate 2 of the pointing means at this time.

Light receiving / emitting means 1 is mounted on both upper ends of the coordinate input area. A light beam bundle (probe light) of L1, L2... Ln is emitted from the light receiving / emitting means 1 toward the coordinate input area 3. Actually, it is a fan-shaped plate-like light wave that travels along a plane parallel to the coordinate input plane spread from the point light source 81. A retroreflective member 4 is attached to the periphery of the coordinate input area 3 with the retroreflective surface facing the center of the coordinate input area 3.

The retroreflective member is a member having a characteristic of reflecting incident light in the same direction regardless of the incident angle. For example, when focusing on one beam L12 among the fan-shaped plate-like light waves emitted from the light receiving / emitting means 1, the beam L12
Is reflected by the retroreflective member 4 and travels back to the light emitting / receiving means 1 along the same optical path as the retroreflected light L11 again. The light receiving / emitting means 1 is provided with a light receiving means, which will be described later, and can determine whether or not the returning light has returned to the light receiving / emitting means for each of the probe lights L1 to Ln.

Now, consider the case where the user touches position 2 with his hand. At this time, the probe light L10 is blocked by the hand at the position 2 and does not reach the retroreflective member 4. Therefore, by detecting that the return light of the probe light L10 does not reach the light receiving / emitting means 1 and that the return light corresponding to the probe light L10 is not received, the supporting object is placed on the extension line (straight line L) of the probe light L10. Can be detected. Similarly, the probe light is emitted from the light receiving / emitting means 1 installed at the upper right of FIG. 1, and by detecting that the return light corresponding to the probe light L13 is not received, the extension line (the straight line R) of the probe light L13 is detected. ) Can be detected when the supporting object is inserted. If the straight line L and the straight line R can be obtained, the coordinates at which the support means 2 is inserted can be obtained by calculating the intersection coordinates by calculation.

Next, the structure of the light receiving / emitting means 1 and the probe light L
A mechanism for detecting which of the probe lights 1 to Ln is blocked will be described. FIG. 2 schematically shows the internal structure of the light receiving / emitting means 1. FIG. 2 is a diagram of the light emitting / receiving unit 1 attached to the coordinate input surface of FIG. 1 when viewed from a direction perpendicular to the coordinate input surface 3. Here, for simplicity, the description will be made on a two-dimensional plane parallel to the coordinate input surface 3.

In the schematic configuration of the light receiving / emitting means 1, a point light source 8
1, a condenser lens 51 and a light receiving element 50. The point light source 81 emits light in a fan shape in a direction opposite to the light receiving element 50 when viewed from the light source. The fan-shaped light emitted from the point light source 81 is considered to be a set of beams traveling in the directions indicated by arrows 53 and 58 and other directions. The beam traveling in the direction of the arrow 53 is reflected by the retroreflective member 4, passes through the condenser lens 51 as shown by the arrow 54, and passes through the light receiving element 50.
The upper position 57 is reached. The beam traveling along the traveling direction 58 is reflected by the retroreflective member 4, passes through the condenser lens 51 as shown by an arrow 59, and reaches a position 56 on the light receiving element 50. Thus, the point light source 8
The light emitted from 1, reflected by the retroreflective member 4, and returned on the same path reaches respective different positions on the light receiving element 50 by the action of the condenser lens 51.
Therefore, when the pointing means is inserted at a certain position and a certain beam is cut off, the light does not reach the point on the light receiving element 50 corresponding to the beam. Therefore, by examining the distribution of the light intensity on the light receiving element 50, it is possible to know which beam is blocked.

FIG. 3 is a diagram for explaining the above operation in detail. In FIG. 3, it is assumed that the light receiving element 50 is installed on the focal plane of the condenser lens 51. Light emitted from the point light source 81 toward the right side in FIG. 3 is reflected by the retroreflective member 4 and returns along the same path. Therefore, the light is condensed again at the position of the point light source 81. The center of the condenser lens 51 is installed so as to coincide with the position of the point light source 81. The return light returning from the retroreflective member 4 passes through the center of the condenser lens 51, and thus travels in a symmetrical path behind the lens (light receiving element side).

At this time, the light intensity distribution on the light receiving element 50 is considered. For example, if the indicating means is not inserted at the position shown in FIG. 2, the light intensity distribution on the light receiving element 50 is almost constant, but as shown in FIG. The beam passing here is blocked,
On the light receiving element 50, a region where the light intensity is weak occurs at the position of the position Dn (dark spot). This Dn corresponds to the outgoing / incident angle θn of the blocked beam, and θn can be known by detecting Dn. That is, θn can be expressed as a function of Dn as follows: θn = arctan (Dn / f) Equation (1) Here, in particular, θn in the light receiving / emitting means 1 at the upper left of FIG. 1 is replaced with θnL, and Dn is replaced with DnL.

Further, in FIG. 4, the angle .theta.L between the position 2 of the pointing means and the coordinate input means 3 is obtained by conversion g of the geometric relative positional relationship between the light receiving / emitting means 1 and the coordinate input area 3.
Is a function of DnL obtained by Expression (1), and θL = g (θnL) Expression (2) where θnL = arctan (DnL / f).

Similarly, for the light receiving / emitting means 1 at the upper right of FIG. 1, the L symbol in the above equation is replaced with an R symbol, and the geometrical relationship between the right light receiving / emitting means 1 and the coordinate input area 3 is obtained. By the conversion h of the relative positional relationship, θR = h (θnR) Equation (3) where θnR = arctan (DnR / f).

Here, if the mounting interval of the light receiving and emitting means on the coordinate input area is w shown in FIG. 4 and the origin and the coordinates are as shown in FIG. The coordinates (x, y) of the point 2 are as follows: x = wtanθR / (tanθL + tanθR) Equation (4) y = wtanθL · tanθR / (tanθL + tanθR) Equation (5)

As described above, x and y can be represented as functions of DnL and DnR. That is, the positions DnL, DnR of the dark spots on the light receiving element 50 on the left and right light emitting / receiving means 1
Is detected, and by considering the geometrical arrangement of the light receiving and emitting means, the coordinates of the point 2 designated by the indicating means can be detected.

Next, an embodiment will be described in which the optical system described above is installed in a coordinate input area, for example, on the surface of a display. FIG. 5 shows the left and right light emitting / receiving means 1 described with reference to FIGS.
This is an embodiment in which one of them is installed on the surface of the display 3. 3 in FIG. 5 shows a cross section of the display surface when viewed in the direction from the negative to the positive y-axis shown in FIG. FIGS. 5A and 5B are displayed with the viewpoint changed as shown in FIGS. 5A and 5B for explanation.

The light emitting means of the light receiving / emitting means 1 will be described. As the light source 83, a light source such as a laser diode or a pinpoint LED that can narrow the spot to some extent is used. Light emitted perpendicularly to the display surface 3 from the light source 83 is collimated by the cylindrical lens 84 only in the x direction. This is because the collimator is turned back by the half mirror 87 and then distributed as parallel light in a direction perpendicular to the display surface. The light exiting from the cylindrical lens 84 is divided into two cylindrical lenses 8 whose curvature distribution is orthogonal to the cylindrical lens 84.
At 5,86, light is collected in the direction shown in FIG. Part A in FIG. 5 illustrates the arrangement of the cylindrical lens groups and the state of condensing the light flux when the viewpoint is rotated about the z-axis and viewed from the x direction in order to explain this situation.

By the action of the cylindrical lens group, a linearly focused area is formed behind the cylindrical lens 86. Here, a slit 82 narrow in the y direction and elongated in the x direction is inserted. That is, the linear secondary light source 81 is formed at the slit position. The light emitted from the secondary light source 81 is folded back by the half mirror 87, and the display surface 3
Is parallel light without spreading in the vertical direction, and travels along the display surface 3 while spreading in a fan shape around the secondary light source 81 in the direction parallel to the display surface 3. The light that has traveled is reflected by the retroreflective member 4 provided at the peripheral edge of the display, and returns to the half mirror 87 (arrow C) along a similar path. The light transmitted through the half mirror 87 travels parallel to the display surface 3, passes through the cylindrical lens 51, and enters the light receiving element 50.

At this time, the secondary light source 81 and the cylindrical lens 51 are in a conjugate positional relationship with respect to the half mirror 87 (D in FIG. 5). Accordingly, the secondary light source 81 corresponds to the light source 81 in FIG. 3, and the cylindrical lens 51 corresponds to the lens 51 in FIG. 5 shows the cylindrical lens and the light receiving element on the light receiving side as viewed from the z-axis direction while changing the viewpoint, and corresponds to the lens 51 and the light receiving element 50 in FIG.

Next, the principle of a second example of an optical coordinate input / detection device to which the present invention is applied will be described. FIG. 6 shows a typical optical coordinate input device. As shown in FIG. 6, for example, light emitting diodes (LEDs) 11 arranged Xm in the horizontal direction and opposed to each other in a one-to-one correspondence. Xm of, for example, phototransistors 12
And Yn LEDs 13 arranged in the vertical direction, and Yn phototransistors 14 opposed to each other in a one-to-one manner to form a coordinate detection area 3.

When a touch input is performed on, for example, the touch portion 15 in the coordinate detection area 3, the optical path passing through the touch portion 15 is blocked, and thus the amount of light received by the phototransistors 12, 14 in the cutoff optical path is reduced. descend.
Therefore, the phototransistor 12, in which the amount of received light is reduced,
The position of the touch coordinates is averaged to calculate the position 16 of the touch coordinates.

Next, the principle of a third example of an optical coordinate input / detection device to which the present invention is applied will be described. FIG. 7 is a configuration diagram of a third example of the optical coordinate detection device. Here, the light emission detection devices 21 and 22 are fixedly installed at two adjacent corners (k1, k2) of the coordinate input surface 3 which is a quadrangular flat plate. Light is emitted from the two light emission detection devices 21 and 22 onto the coordinate input surface 3. On the other hand, the user points to an arbitrary position on the coordinate input surface 3 with the position pointing stick, that is, the pen 24. At this time, the light emission detection devices 21 and 22 reflect the light emitted from the light emission detection devices 21 and 22 by the pen 24 and
The light returning to the position 22 is detected, and the position coordinates of the pen 24 are calculated. Each of the light emission detection devices 21 and 22 has the same configuration, and includes light emission units 21A and 22A and light reception angle detection units 21B and 22B. Here, the light emission detection devices 21 and 22 are configured such that both the light emission optical axis of the light emitted from the light emission unit and the light reception optical axis of the light reception angle detection unit face the direction of the reference point 23 on the coordinate input surface. Coordinate input surface 3
Installed for The light emission detecting device corresponds to the light emission / detection unit described above, the light emitting unit corresponds to the light emitting unit, and the light receiving angle detection unit corresponds to the angle detection unit.

In FIG. 7, the direction of a line segment a1 connecting the angle k1 of the coordinate input surface 3 and the reference point 23 and the direction of a line segment a2 connecting the angle k2 of the coordinate input surface and the reference 23 are determined by the light emission detecting devices 21 and 22.
These are the light emitting optical axis and the light receiving optical axis. Where the line segment a
1 and a2 are directions in which the angle of the coordinate input surface 3 is bisected into 45 °. Further, the angle k2 of the coordinate input surface 3 is set to the origin (0,
0), and the position on the coordinate input surface 3 is represented by an XY coordinate system in which the horizontal direction is the Y axis and the vertical direction is the X axis.

FIG. 8 is a conceptual diagram showing the configuration of one embodiment of the light emission detection devices 21 and 22. Here, the light emitting units 21A and 22A of the light emission detecting device are light sources (LEDs) 5 (5A and 5A).
B) and an optical lens 6 (6A, 6B).
The optical lens 6 (6A, 6B) changes only the magnification in one direction of the image, or changes only the magnification in one direction of the image, and has no change in magnification due to the incident angle. Is used. Also, the light-receiving angle detection unit 2 of the light emission detection device
Each of 1B and 22B includes a PSD 7 (7A, 7B) and a cylindrical lens 8 (8A, 8B).

The light emitted from the LED 5 is condensed by an optical lens 6 disposed immediately before the light so as to be a beam parallel to the coordinate input surface 3. That is, as shown in FIG. 12, light in a direction perpendicular to the coordinate input surface 3 is condensed by the optical lens 6 so as to be parallel to the coordinate input surface 3,
Further, the beam is formed into a fan-shaped beam parallel to the coordinate input surface 3. In this way, if we focus on a fan-shaped beam,
Because light can be used more effectively than when no light is collected,
The reliability of position detection can be improved. Here, the LED 5 may emit visible light, but L2656 (Hamamatsu Photonics) that emits infrared light (wavelength 890 nm) is used. Also, the optical lens 6
The length in the direction perpendicular to the coordinate input surface 3 is 10 m
m, a length parallel to the coordinate input surface 3 and perpendicular to the emission optical axis of the infrared light is about 10 mm, and a focal length is about 6 mm. Further, L is set at the focal position of the optical lens.
The light emitting point of the ED 5 is fixedly arranged.

As shown in FIG. 8, the cylindrical lenses 8 (8A, 8B) constituting the light-receiving angle detectors 21B, 22B converge the reflected light from the pen 24 in a direction parallel to the coordinate input surface 3. Are arranged as follows. Then, the focused spot light is received by the PSD 7 (7A, 7B). P
As shown in FIG. 8, the SD 7 has a structure elongated in a direction parallel to the coordinate input surface 3, and the light receiving surface is a PN junction surface for converting incident light into an electric signal.

The PSD 7 has output terminals (S ₁ , S ₂ ) for extracting current at both ends of the light receiving surface.
Currents (I ₁ , I ₂ ) inversely proportional to the distance between the light receiving point S ₀ and the output terminal are output from the output terminal. The current (I ₁ , I ₂ ) is A / D converted and calculated by a microcomputer, whereby the position of the light receiving point S ₀ can be specified, and further, the light receiving angle of the reflected light from the pen 24 is calculated. Can be. A control circuit for performing this arithmetic processing will be described later. The PSD 7 may have a light receiving surface length of 13 mm in a direction parallel to the coordinate input surface 3 and a length of approximately 1 mm in a direction perpendicular to the coordinate input surface 3.
For example, S3270 manufactured by Hamamatsu Photonics can be used.

FIG. 10 shows the cylindrical lens 8 and the PS.
A specific arrangement example of D7 is shown. Here, the cylindrical lens 8 has a length in a direction parallel to the coordinate input surface 3 and the light receiving surface of the PSD 7 of about 10 mm and a length in a direction perpendicular to the coordinate input surface 3 of about 10 mm. Are arranged so that the distance between the optical center position of the light emitting device and the light receiving surface of the PSD 7 is 6.5 mm. Further, a mask 9 made of a material such as black ABS is arranged around the cylindrical lens 8 so that the reflected light from the pen 24 does not directly enter the light receiving surface of the PSD 7.

Further, the focal length of the cylindrical lens 8 changes because the distance between the lens and the PSD 7 changes due to the difference in the incident angle of the reflected light from the pen 24.
May be between the maximum value max and the minimum value min of the distance between the center of the pixel 7 and the light receiving surface of the PSD 7. For example, in the case of FIG. 10, since max = 9.2 mm and min 6.5 mm, a cylindrical lens 8 having a focal length of about 9 mm may be used. Note that the coordinate input surface 3 of the mask 9 described above is used.
Is the length of the light receiving surface of the PSD 7 (= 1
3 mm), for example, in the case of FIG. 10, it may be about 15 mm.

In the embodiment shown in FIG. 8, the configuration in which the cylindrical lens 8 is used to focus the reflected light from the pen 24 to the spot light is shown. However, the present invention is not limited to this, and is shown in FIG. As shown, the cylindrical lens 8
Instead of this, an aperture having one minute transmission hole may be used. FIG. 9 shows a conceptual diagram of the configuration of the light emission detecting means 21 and 22 using the aperture 10. In the case of this embodiment, of the reflected light from the pen 24,
Only light that has passed through the A is received by the light receiving point S ₀ of PSD7 as a spot light. As the aperture 10, a thin plate made of a material such as black ABS may be used.

FIG. 11 shows a specific arrangement example of the aperture 10 and the PSD 7. Here, as in FIG.
When the length of the light receiving surface of D7 is 13 mm, the aperture 10 is placed at a position that is half the distance from the light receiving surface of PSD 7 by 6.5 mm so that the light receiving surface of PSD 7 and the surface of the aperture 10 are parallel. Deploy. The size of the aperture 10 is such that the reflected light from the pen 24 is P
It is preferably larger than the light receiving surface of PSD 7 so that it does not directly enter the light receiving surface of SD 7. For example, PSD7
The size of the aperture 10 can be about 15 mm × 3 mm with respect to the size of the light receiving surface of 13 mm × 1 mm. The transmission hole 10A is shorter than the length of the light receiving surface of the PSD 7 (13 mm) in the direction parallel to the coordinate input surface 3 and longer than the length (1 mm) of the light receiving surface of the PSD 7 in the direction perpendicular to the coordinate input surface 3. I do. For example, as shown in FIG. 11, the size can be 2 mm × 2 mm.

FIGS. 8 and 9 show conceptual diagrams of the light emission detecting device. The components (the light source LED 5, the optical lens 6, the PSD 7, the cylindrical lens 8 or the aperture 10) are arranged as described above. And may be integrally molded into one housing. However, the light emitting unit (LED5,
The optical lens 6) and the light-receiving angle detection unit (PSD 7, cylindrical lens 8 or aperture 10) are arranged as close as possible to each other so as not to interfere with light emission and light reception. Shaft, cylindrical lens 8 or aperture 10
It is necessary to arrange so that the light receiving optical axis of the infrared light received in the same direction is in the same direction. The luminescence detection device is 20mm x 15mm x 1
Since the size can be set to about 0 mm, the size can be reduced as compared with the case where the position detection is performed by scanning the light beam using the rotary motor.

FIG. 13 shows the LED 5 (5A, 5B) and P
FIG. 3 is a block diagram showing a configuration of a control circuit of SD7 (7A, 7B). The control circuit LED 5 (5A, 5B) and a control of emission timing of, and performs calculation of PSD 7 (7A, 7B) current output from (I _1, I _2). As shown in the figure, the control circuit mainly includes an MPU 37, a ROM 35 for storing programs and data, a RAM 36,
Timer 38 for controlling light emission time interval, interface driver 39, A / D converter 33, and LED
The configuration is such that the driver 34 is connected to the bus. PSD7
As circuits for calculating the currents (I ₁ , I ₂ ) output from (7A, 7B), amplifiers 31 (31A, 31B) and an analog operation circuit 32 are connected to the output terminals (S ₁ , S ₂ ) of the PSD.
(32A, 32B) are connected as shown. PSD7
The currents (I ₁ , I ₂ ) output from (7A, 7B) are input to the amplifier 31 (31A, 31B) and amplified.
The amplified current signal is supplied to the analog operation circuit 32
At (32A, 32B), processing such as I ₂ / (I ₁ + I ₂ ) is performed.
The signals are converted into digital signals by (33A, 33B) and passed to the MPU 37. After that, the MPU 37 calculates the light receiving angle and the position coordinates of the pen. Note that this control circuit may be incorporated in the same housing as one of the light emission detection devices, or may be incorporated in a part of the coordinate input surface 1 as a separate housing. Further, it is preferable to provide an output terminal for outputting the calculated coordinate data to a personal computer or the like via the interface driver 39.

Next, FIG. 14 shows an embodiment of the shape of the tip of the pen 24 which is a position pointing stick used in the present invention.
The pen 24 has a shape similar to that of a so-called writing instrument, and has a structure (retroreflective portion) for reflecting light at its tip portion 24A, that is, in a region through which light emitted from the light emission detection devices 21 and 22 passes. Prepare. In particular, the “structure that reflects light” is a recursive structure that reflects light emitted from the light emission detection devices 21 and 22 in the same direction as the incident direction.

FIG. 14 shows a configuration example in which the tip 24A of the pen 24 is composed of a large number of corner cubes. As shown in FIG. 15, the corner cube is a combination of three plane mirrors that are perpendicular to each other. In general, a portion surrounded by a thick line in a figure obtained by cutting one corner from a glass cube is used as a corner cube. In the corner cube 25 configured as described above, after the incident light is reflected once on each of the three surfaces, the reflected light accurately returns to the direction of the incident light. For example, a corner cube having a side length c of 2 mm is radially arranged at the tip of a pen having a diameter of 10 mm. Further, as shown in FIG. 14, when the adjacent corner cubes are arranged in a reversed direction, each corner can be composed of 62 corner cubes, and as shown in FIG. Can be configured. Although a structure using a corner cube as a structure in which the reflected light returns in the direction of the incident light has been described, if the reflected light has a recursive property in which the reflected light returns in the direction of the incident light,
Other structures may be used.

Next, the principle of detecting the position indicated by the pen 24 in the coordinate detecting device of the present invention will be described. Here, a case will be described in which two light emission detection devices are used, as shown in FIG. 7, but the same pen pointing position can be detected using three or more light emission detection devices. First,
On the coordinate input surface 3 of FIG. 7, the pen 2 shown in FIG.
It is assumed that an appropriate position (X, Y) is designated by using No. 4. At this time, the LED 5A of the light emitting unit 21A of the light emission detecting device 21
Out of the infrared light emitted from the camera, the light emitted in the direction of the line segment p1 hits the pen 24, and the reflected light thereof travels in the opposite direction on the same line segment p1 and is received by the PSD 7A of the light receiving angle detection unit 21B.
Similarly, the LED 5B of the light emitting unit 22A of the light emission detecting device 22
Out of the infrared light emitted from the camera, the light emitted in the direction of the line segment p2 hits the pen 24, and the reflected light thereof travels in the opposite direction on the same line segment p2, and is received by the PSD 7B of the light-receiving angle detector 22B.
The light received by the PSDs 7A and 7B forms spot lights at different positions on the light receiving surface of the PSD 7 depending on the incident angle to the PSDs 7 (7A and 7B) as shown in FIG. Here, the line segment p2 forms an angle of a line segment a2 to θ2 that bisects the angle k2 of the coordinate input surface 3, and the line segment p1 is a line segment a1 that bisects the angle k1 of the coordinate input surface 3. Θ1.

FIGS. 16A and 16B show a specific example of the positional relationship between the coordinate input surface 3 and the cylindrical lens 8A and the PSD 7A forming the light receiving angle detecting means 21B. Here, the light receiving surface of PSD 7A is the coordinate input surface 3
It is perpendicular to a line segment a1 forming an angle of 45 ° with the side. That is, a line segment a1 connecting the center of the cylindrical lens 8A and the center of the light receiving surface of the PSD 7A coincides with the light receiving optical axis and the light emitting optical axis. Also, let L be the distance between the center of the cylindrical lens 8A and the center of the light receiving surface of the PSD 7A,
The length of the light receiving surface of A is 2L.

Now, it is assumed that the reflected light from the pen 24 passes through the line segment p1 and is received at a position D1 away from the central position of the PSD 7A. In addition, 2 of the light receiving surface of PSD7A
The current values obtained from the two output terminals are defined as I ₁ and I ₂ . At this time, the following relationship is established between the current and the light receiving position of the PSD. I ₁ = I ₀ × (L−D 1) / 2L I ₂ = I ₀ × (L + D 1) / 2 L I ₀ = I ₁ + I ₂ (I ₀ : all currents) Therefore, L + D 1 = ₂ L × I ₂ / (I ₁ + I ₂ ).

That is, the light receiving position D1 of the reflected light is PS
D7A is obtained from the current values I ₁ and I ₂ obtained by D7A.
Calculated by 2A. By the way, according to FIG. 16B, the relationship of D1 / L = tan θ1 holds,
The incident angle θ1 of the reflected light is obtained from the following equation. θ1 = tan ⁻¹ (D1 / L)

Similarly, the other light emission detecting device 22
Also, assuming that the distance from the center of the PSD to the light receiving position is D2,
The incident angle θ2 of the reflected light is obtained. θ2 = tan ⁻¹ (D2 / L)

Further, the pointing position (X, Y) of the pen 24
Is a line segment a formed by the incident angles θ1 and θ2 of the two reflected lights.
Since it is the intersection of 1 and a2, the indicated position (X, Y) is obtained from θ1 and θ2 from the following equation. Y = Xtan (45 ° −θ2) Y = (AX) tan (45 ° −θ1) Here, A is the horizontal length of the coordinate input surface 1 as shown in FIG.

By solving the above simultaneous equations, the position coordinates X and Y on the coordinate input surface 3 specified by the pen 24 are obtained. Since (θ1, θ2) and (X, Y) are formalized, if these formulas are programmed and incorporated in the ROM, they can be easily obtained by the calculation of the MPU 37. Further, the (X, Y) coordinate value, which is the calculation result, is transferred to a personal computer or the like via the interface driver 39, and can be used for processing such as displaying the position indicated by the pen and inputting a command corresponding to the indicated position.

In the above embodiment, an example in which two light emission detection devices are used has been described. However, if the LEDs of both devices emit light at the same time, mutual infrared light may be detected by the PSD in the other device. Therefore, the LED driver 34 (34A, 34A)
B), the light emission control of the LEDs 5 (5A, 5B) is alternately performed in a time-division manner, and synchronized with this, the PSD 7 (7
A, 7B) is preferably detected. For example, in a state where one LED emits light and the other LED is turned off, the current of the PSD corresponding to one LED is detected, and after 10 msec, one LED is turned off and the other LED emits light. Thus, the current of the PSD corresponding to the other LED can be detected. That is, one of the two LEDs may be made to emit light alternately every 10 msec. This control is performed by the MPU 37 using the timer 38. By performing the time-sharing control of the LED light emission in this manner, erroneous detection of infrared light is eliminated, and position detection can be sufficiently followed even when the pen 24 moves.

The coordinate input surface 3 only needs to be a flat shape that can indicate a position with the pen 24, and is not particularly limited to the square shape as shown in the embodiment of FIG. I don't care. In the above-described embodiment, it is assumed that a flat plate is used as the coordinate input surface 3. However, the present invention is not limited to this, and a display device, for example, a display screen of a CRT or LCD may be used. CRT
When using an LCD or LCD, the display light is generated by PSD7 (7A, 7A).
In order to eliminate the influence of being incident on B) and being erroneously detected, it is preferable to use the infrared emitting LED described above.
As (7A, 7B), it is preferable to use one that can detect the peak emission wavelength of the infrared light emitting LED. Further, in order to prevent infrared rays generated from the CRT or the LCD from affecting the coordinate detection, it is preferable to arrange an infrared cut filter made of a PVC resin or the like on the display screen.

Although the principles of the three methods of the optical coordinate input / detection device have been described above, these are examples relating to the coordinate input / detection device, and the present invention is not limited to these methods. . As described above, the present invention provides such an optical coordinate input / detection device, a CRT, an LCD,
The present invention relates to an information input / detection / display device that displays information at a predetermined position based on coordinates input / detected by a coordinate input / detection device in combination with a display device such as a plasma display.

FIG. 17 shows an information input / detection / display member 40.
Are shown together with the holding members 41 and 42 that support it, the control unit 43, and the like. However, 40A is input /
The front face 43A of the detection / display member 40 indicates switches, keys and the like. FIG. 18 shows the information input / simplification shown in FIG.
Showed detectable / display member 40 in more detail one (viewed from Fig. 17 similar side), 40 ₁ information inputting / detecting member,
40 ₁₁ input / detection unit, 40 ₂ display member, 40 ₂₁ the display surface, is 40 ₃ connecting member, which includes an information inputting / detecting member 40 ₁ in accordance with the principles as described above, is input / detection in which the display member 40 ₂ to display information to a predetermined position based on the coordinates showing information input / detection / display member 40 both are formed by stacking so as to be substantially parallel through a connecting member 40 ₃ is there.

FIG. 19 shows a scene in which such an apparatus is actually used. Generally, in such an apparatus, as shown in FIG. 19, the information input / detection surface and the display surface are arranged so as to be perpendicular or approximately perpendicular to the floor. In the figure, the left side of the human M ₁ is a so-called operator, human M ₂ sitting in the right chair is where looking at the display information corresponding to the input / detection information entered by the operator. In the figure, the person M ₁ who is operating and the person M ₂ who is sitting on a chair are each one person, but not necessarily one person, and more people may appear. In general, a conference or the like is held via such a device, and usually there are many people who are sitting on a chair.

An example of usage conditions will be described. While viewing the device sit in a chair at a position 2~10m from the front of the human M ₂ sitting in the chair, for example the device (display surface) performing a meeting. It may be closer than 2m, but 1
Since only two people can see this device, it is often used by two or more people at a distance of 2 m or more. Conversely 1
If this device is used at a distance of more than 0 m, the display surface becomes difficult to see, which is not preferable.

As shown in FIG. 19, such an apparatus
In many cases, a person looks at the display surface from almost the front and obtains information on the display surface arranged so as to be perpendicular or approximately perpendicular to the floor. There are exceptional situations where there are too many viewers and some people have to look at the display surface diagonally to the display surface, but this is only an exceptional case,
Generally, it is common to see from the front and a position almost close to the front, which is the easiest to see.

Here, it is assumed that a person who is looking at the display surface is looking at the viewing angle θv in the vertical direction. In other words, while looking at the display surface normally in front without opening your eyes wide open or moving your face up and down,
The viewing angle at which good visual information is obtained is θv. In this case, visual information is input to the outside and the periphery of the viewing angle θv such that something is visible but cannot be clearly distinguished, but this is not considered here.

FIG. 20 is a view (top view) of a person looking at the display surface of this device as viewed from above. For simplicity in the figure shows only the head of an information input / detection / display member 40 and the human M _2. At this time, if the person is a healthy person, the horizontal viewing angle θh is the aforementioned vertical viewing angle θv.
Greater than. Because this is seen with two eyes. In other words, for a normal healthy person, the horizontal viewing angle θh is larger than the vertical viewing angle θv, so even when considering an apparatus like the present invention, a configuration that maximizes the characteristics of the human being. It is important that

From the above viewpoint, the present invention enables a human to obtain the display information of such a device most efficiently (without waste). That is, when a healthy person obtains information from the display device, the horizontal viewing angle θh
Is greater than the vertical viewing angle θv. In other words, considering that the shape / size / size ratio of the display surface is such that the horizontal viewing angle θh of the healthy person is larger than the vertical viewing angle θv, the display surface is set to be horizontally long so as to correspond to it. I am trying to become. In other words, the display surface is arranged so as to be perpendicular or approximately perpendicular to the floor, and the display surface has a wider area in the horizontal direction than in the vertical direction. Specifically, it is a rectangle that is long in the horizontal direction.

As described above, the effect of making the display surface wider in the horizontal direction than in the vertical direction is as follows.
Not only is the viewing angle optimized or close to the above-mentioned viewing angle, but also the amount of display information and the amount of information that can be handled by the information input / detection / display device of the present invention can be increased.

Normally, as shown in FIG. 19, such a device is used by a human standing (although it may be sitting) (input of information). In such a case, since the height of a human has an upper limit, information input / detection /
There is a limit in increasing the amount of information that can be handled by expanding the area in the vertical direction of the display surface 40. However,
As in the present invention, the area is set in the horizontal direction (left and right horizontal direction).
As a result, an area that greatly exceeds the limit of human height can be secured, and the amount of information that can be handled can be increased.

It is to be noted that the size of the area is the same as the general use range as described above, that is, by sitting on a chair at a position of 2 to 10 m from the front of the device, the device (display surface)
Assuming that a meeting or the like is performed while watching the information, the height direction (vertical direction) of the information input / detection / display surface is 3 at most.
m. This is not only due to the operability of the information input person due to the upper limit of the human height, but also from the vertical viewing angle θv of the human looking at the display surface when used in such a situation (position). Should be. In other words, by setting the height direction (vertical direction) to at most 3 m, you can open your eyes particularly large, or
The information can be visually recognized in a state where the user normally looks at the front display surface without moving the face up and down.

Next, the size in the horizontal direction (horizontal direction) should be at most 8 m, as shown in FIG. 20, from the relation of the viewing angle θh in the horizontal direction. Within this range, 2 to 1 from the front of the device as described above
If it is assumed that a conference or the like is performed while sitting in a chair at a position of 0 m and looking at this device (display surface), a person looking at this display surface assumes an almost constant posture without particularly shaking his head to the left or right. While taking, the information on the display surface in the left-right direction can be visually recognized well.

The following shows the result of having a plurality of subjects hold a simulation meeting using this device and answering about the degree of fatigue and the like. In the experiment, specifically, as shown in FIG. 19, a plurality of subjects were seated on a chair at a position 2 to 10 m from the front of the device, and while viewing the display surface of the device,
We asked them to hold a time simulation meeting and responded to their fatigue and dissatisfaction. Except for the operator (the person M ₁ who stands on the left side of FIG. 19 and performs the information input operation), all the test subjects are seated in the chairs, and the position of the eyes of each test subject is 1 to 1 from the floor.
At a position of 1.3 m, the display surface of this device was viewed straight from the front, and a simulation meeting was started with all the display information in the vertical direction visible.

What is changed here is the size of the display area. The horizontal length of the display area is 8m, 10m, 12m
Because the production of the device is difficult, two units each of 2m x 4m in length x width (in the case of 8m)
2 units of 2m × 4m and 1 unit of 2m × 2m (1
(In the case of 0 m), 3 m (2 m × 4 m) (in the case of 12 m) were substituted. The test subject was 1.
0-1.5 (hereinafter referred to as healthy person), Myopia using a contact lens with a visual acuity of 0.7-1.0 (hereinafter referred to as contact), strong myopia (Eyes are 0.01 or less with the naked eye) and 7 people have eyesight of 0.7-1.0 using the glasses (hereinafter referred to as glasses). Went by.

The number of subjects who complained in each experiment is shown below. Table 1 shows the case where the subject was tired. In Table 1, X indicates the case where the subject complained of fatigue, and ○ indicates the case where the complaint did not complain of fatigue. In addition, the tiredness of the healthy subjects and glasses was stiff shoulders, and the contact complained of both dry eye and stiff shoulders.

[0067]

[Table 1]

From the above results, it was found that if the length of the display surface in the horizontal direction was too long (10 m or more), the user complained of malfunction. In particular, it was found that more people complained of problems with users who had anxiety about their vision than healthy people. This is because the horizontal viewing angle θh of a human (healthy person) is
Since it is larger than the vertical viewing angle θv, it is appropriate to make the display surface area horizontally long from an ergonomic point of view, but if it becomes too large (long), the horizontal viewing angle θh protrudes. It seems that complaints have arisen because they had to move their necks.

Next, Table 2 shows the results of the same experiment and the subject who reported dissatisfaction in use. The dissatisfaction is an evaluation from the viewpoint of convenience in use, more specifically, whether or not the device is worthy of use.

[0070]

[Table 2]

Here, when the horizontal length of the display surface is 2 m,
All were dissatisfied with it. After investigating the reason
19, an operator performs an information input operation while standing on the left side of FIG.
Human M ₁) Is standing in front of the display surface,
When the length is small, about half of the display area is shaded by humans.
The amount of information that can be handled is small because
The main reason is that it is difficult to see / dissatisfied with use
Met.

Next, a similar experiment was conducted with the vertical length of the display surface set to 2.5 m. In this case as well, for those having a long horizontal length (8 m, 10 m, 12 m), a plurality of devices were arranged, and the size in the horizontal direction was substituted. Table 3 shows the results.

[0073]

[Table 3]

Also in this case, similarly to the above result, the horizontal length of the display surface is too long (10 m or more).
It was found that the user complained of a malfunction. It is also the same that there are more users who complain of anxiety than those who are not healthy.

Next, Table 4 shows the results of the same experiment and test subjects who reported dissatisfaction in use.

[0076]

[Table 4]

Also in this case, the horizontal length of the display surface is 2.5 m.
Everyone was dissatisfied with the following cases, for similar reasons:

From the above results, the information input / input as in the present invention is performed.
In the detection / display device, it can be seen that the display surface needs to be largely landscaped so that the user can use it without dissatisfaction with the amount of information that can be handled.

Next, the same experiment was carried out with the vertical length being made slightly smaller, and the results of having been reported about dissatisfaction in use are shown in Tables 5 and 6.

[0080]

[Table 5]

[0081]

[Table 6]

As a result, when the vertical length is 1.2 m, when the horizontal length is 1.2 m or less, all the members are dissatisfied. Similarly, the operator stands in front of the display surface and operates. Therefore, if the horizontal length is small, substantially half of the display area is hidden behind a human and cannot be used, so that the amount of information that can be handled is reduced and it is difficult to see.

When the vertical length is 0.5 m, all the members are dissatisfied regardless of the horizontal length.
Since the height direction of the display area is too small, the amount of information that can be handled is small, and it is difficult to see. In particular, in the present invention, since the coordinate input is performed by a relatively large means such as a hand or a pen, each coordinate input unit (such as resolution) is large, and if a certain vertical length is not secured, it is simply a horizontal length. It was the subject's opinion that it would be difficult to use even if it was just large.

From the above results, in the information input / detection / display device according to the present invention, in order to use the information amount which can be handled without the user being dissatisfied, the display surface is made to be largely horizontally long, and It is understood that the length in the vertical direction also needs to be 1.2 m or more.

Next, another feature of the present invention will be described. In the information input / detection / display device having a horizontally long display surface as in the present invention, when the left / right length increases, for example, as shown in FIG. It is more convenient for the 40R to be curved inward from the viewpoint of the visibility of the display surface. However, such a curved surface cannot be obtained due to the optical principle of information input / detection of the information input / detection / display device of the present invention. That is, since light travels straight, an optical path cannot be formed along such a curved surface.

[0086] Therefore, in the present invention, as shown in FIG. 22, the information input / detection member 40 ₁ and the display member 40 ₂ more the information input / detection / display member 40 is at its information input / detection member 40 ₁ composed inputting / detecting area with is substantially planar region, the display surface of the display member 40 ₂ is also substantially planar / flat, both as formed by the lamination substantially parallel through the connecting member 40 ₃ I have to. of course,
This does not mean that the display surface has to be completely flat, but that the light emitted from the light source of the present invention has a component in the height direction of the information input / detection surface, so that the curvature is smaller than the height component. Even if there is, it functions optically, so even if there is such a curvature, it is regarded as flat / flat, parallel here.

[0087]

According to the first aspect of the present invention, in the information input / detection / display device as described above, the area of the coordinate input / detection surface and the display surface is horizontally elongated in accordance with the viewing angle of a healthy person. Since the length in the vertical direction was set to 1.2 m or more, an information input / detection / display device with less fatigue and sufficient information amount could be obtained.

According to the second aspect of the present invention, in the information input / detection / display device in which the display surface is arranged substantially perpendicular to the floor as described above, the area of the coordinate input / detection surface and the display surface is horizontally long. And the length in the vertical direction is set to 1.2 m or more.
It could be a detection / display device.

According to the third aspect of the present invention, in the information input / detection / display device based on the optical principle described above, the coordinate input / detection surface and the display surface are detected based on the principle that light travels straight. Since the surface and the display surface were substantially flat, an information input / detection / display device functioning normally could be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an optical coordinate input / detection device to which the present invention is applied.

FIG. 2 shows a light receiving / emitting means attached to a coordinate input surface;
It is the figure seen from the direction perpendicular to the coordinate input surface.

FIG. 3 is a diagram for explaining the operation of the light receiving / emitting means in detail.

FIG. 4 is a diagram showing a geometric relative positional relationship between a light receiving / emitting means and a coordinate input area.

FIG. 5 is a diagram showing an embodiment in which one of right and left light receiving and emitting means is installed on the surface of a display.

FIG. 6 is a diagram showing a typical optical coordinate input device.

FIG. 7 is a configuration diagram of a third example of the optical coordinate detection device.

FIG. 8 is a conceptual diagram of a configuration of an embodiment of a light emission detection device.

FIG. 9 is a conceptual diagram of a light emission detection unit using an aperture.

FIG. 10 is a diagram showing a specific arrangement example of a cylindrical lens and a PSD.

FIG. 11 is a diagram illustrating a specific arrangement example of apertures and PSDs.

FIG. 12 illustrates an example in which light in a direction perpendicular to the coordinate input surface is condensed by an optical lens so as to be parallel to the coordinate input surface, and is further converted into a fan-shaped beam parallel to the coordinate input surface. FIG.

FIG. 13 is a configuration block diagram of a control circuit for an LED and a PSD.

FIG. 14 is a view showing an embodiment of the shape of the tip of a pen which is a position indicating rod.

FIG. 15 is a diagram for explaining a cubic corner in which three plane mirrors are combined so as to be perpendicular to each other.

FIG. 16 is a diagram showing a specific example of a positional relationship between a coordinate input surface, a cylindrical lens forming a light receiving angle detection unit, and a PSD.

FIG. 17 is a diagram showing an information input / detection / display member and a holding member control unit supporting the information input / detection / display member.

FIG. 18 is a diagram showing the information input / detection / display member in more detail.

FIG. 19 is a diagram showing an example in which an information input / detection surface and a display surface are arranged so as to be perpendicular or approximately perpendicular to the floor and used.

FIG. 20 is a view (plan view) of a person looking at the display surface of the device as viewed from above.

FIG. 21 is a diagram illustrating an example in which left and right sides of an input / detection / display surface are curved inward.

FIG. 22 is a top view of the input / detection / display member.

[Explanation of symbols]

 1 ... Light receiving / emitting means, 2 ... Coordinate position, 3 ... Coordinate input area
(Coordinate input device, coordinate input surface), 4 ... retroreflective member,
5 (5A, 5B) ... light source (LED), 6 (6A, 6B)
... optical lens, 7 (7A, 7B) ... PSD, 8 (8A,
8B) ... cylindrical lens, 9 ... mask, 10 ... a
Aperture, 11, 13 ... photodiode, 12, 1
4: Phototransistor, 15: Touch part, 16: Touch
Touch coordinates, 21, 22,... Light emission detecting device, 21A, 22A
... Light-emitting part, 21B, 22B ... Light-receiving angle detecting part, 23 ...
Reference point, 24 ... pen, 40 ... information input / detection / display member,
40 ₁... information input / detection member, 40₁₁… Input / detection unit,
40_Two... Display member, 40_{twenty one}... Display surface, 40_Three... Connecting members.

Continued on the front page (72) Inventor Hiromasa Shimizu 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Sadao Takahashi 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. F term (reference) 5B068 AA05 AA15 AA22 AA32 BB20 BC04 BD01 BD02 BD17 BE06 CC11 CD06 5B087 AA09 AE02 BC01 BC03 CC01 CC05 CC11

Claims (3)

[Claims] 1. A coordinate input / detection device comprising a plurality of light-emitting means and a plurality of light-receiving means, and detecting two-dimensional coordinates of the light-shielding means based on the presence or absence of a light-shielding means in an optical path for light emission / reception. A display device for displaying information at a predetermined position based on the coordinates input / detected by the coordinate input / detection device, a coordinate input / detection surface of the coordinate input / detection device, and a display surface of the display device. In the information input / detection / display device, which is combined so as to be substantially parallel, the area of the coordinate input / detection surface and the display surface is made horizontally long according to the viewing angle of a healthy person and has a vertical length. 1.
An information input / detection / display device characterized by having a length of 2 m or more. 2. A coordinate input / detection device comprising a plurality of light-emitting means and a plurality of light-receiving means, and detecting two-dimensional coordinates of the light-shielding means based on the presence / absence of a light-shielding means in an optical path of light emission / reception. A display device for displaying information at a predetermined position based on the coordinates input / detected by the coordinate input / detection device, a coordinate input / detection surface of the coordinate input / detection device, and a display surface of the display device. In the information input / detection / display device, which is combined so as to be substantially parallel, the coordinate input / detection surface and the display surface are arranged so as to be perpendicular or approximately perpendicular to the floor,
The detection surface and the display surface have a wider area in the horizontal direction than in the vertical direction, and the length of the vertical area is 1.2 m.
An information input / detection / display device characterized by the above. 3. The information input / detection / display device according to claim 1, wherein the detection surface and the display surface are substantially flat.