JPH08320207A - Coordinate input apparatus and light emitting body for the apparatus - Google Patents

Abstract

PURPOSE: To provide a coordinate input apparatus which does not need a wide surface area for input, is economical, and with which input can be done easily and reliably. CONSTITUTION: Three one-dimensional PSD (semiconductor position sensor) 1-3 are set in the same plane. In this case, PSD 1 and PSD 2 may be set in parallel to desks in an office and PSD 3 may be set vertically to them. Slits 4-6 are formed correspondingly in PSD 1-3, respectively. Light rays from an infrared LED 7 are limited to the slit width when the light rays pass slits 4-6 and enter PSD 1-3, respectively. At that time, since respective slits 4-6 are arranged so as to be at right angles to the extended direction of the respective one-dimensional PSD l-3, infrared rays are radiated to only a part of each PSD 1-3. Of respective PSD 1-3, the positions radiated with the infrared rays are detected and thus the coordinate position where the infrared LED 7 exists can be found by calculation based on the detection.

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, and more particularly to a coordinate input device for inputting two-dimensional or three-dimensional coordinates of a light emitter in a non-contact manner.

[0002]

2. Description of the Related Art With the spread of computers and the like in recent years, there are increasing opportunities to operate such devices, for example, on a desk in an office or in a conference room. In order to operate such devices, coordinate input and command selection,
Instruction input etc. is required. In performing these operations, a mouse, a keyboard, a tablet, or a light pen that traces the screen of the display with a pen is currently used. A user needs to operate these plural devices, and an area for operating these devices is required on a desk or a table in a conference room. However, in order to handle a large amount of information and to carry out smooth communication with remote locations, it is indispensable to have a technique for performing the operations as easily as possible, with a high degree of freedom, and with a small operation area. Is coming. Desirably, there is a desire to use only a simple device such as a pen to input data not only on a plane but also in space.

On the other hand, various coordinate input devices have been conventionally developed. For example, as a device for inputting coordinates on a plane, Japanese Patent Laid-Open Nos. 55-56285 and 56-56 are available.
A method using a dedicated tablet as described in JP-A-29778, a method in which a laser is built in a pen as described in JP-A-1-269118, or JP-A-2-148213. There is a method of incorporating an acceleration measuring element as described in Japanese Patent Publication No. The method using the dedicated tablet requires an area for installing the tablet as described above. Further, in the method in which the laser is built into the pen, the reflected light from the paper surface of the laser is received, so that an area for mounting the paper surface is required. Further, the method of incorporating the acceleration measuring element inside the pen has a problem that complicated processing for calculating the position is required.

In addition to these methods, as a coordinate input method using a light emitting element, for example, a two-dimensional semiconductor position sensor (hereinafter abbreviated as PSD) and a lens as described in Japanese Utility Model Laid-Open No. 25525/1993. There is a method using.
However, this method uses a two-dimensional PSD,
The problem is that the device is expensive.

Further, as a conventional technique relating to coordinate input or shape measurement in a three-dimensional space, for example, Japanese Patent Laid-Open No.
There is a method of recognizing the movement of an LED attached to a pen with a plurality of cameras, as described in Japanese Patent Publication No. 255910. However, providing a plurality of cameras is not suitable for arranging on a narrow desk or a table in a conference room because the device becomes large. There is also a problem that the camera itself is expensive and the cost of the device is high. As another technique, there is a system using a plurality of two-dimensional PSDs and pinholes as described in JP-A-3-150623, but the two-dimensional PSD is expensive as described above. In addition, depending on the installation method, the influence of ambient light cannot be avoided and input may not be possible. Still another technique is, for example, a system in which one-dimensional CCDs are opposed to each other in a direction orthogonal to each other, as described in JP-A-54-116258. In this method, the position where the one-dimensional CCD is arranged is limited, so it is effective in the measuring device which is not restricted to the place where it is originally used, but it is not suitable when it is arranged on a narrow desk. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and does not require a large area for input, is inexpensive, and allows easy and reliable input of coordinates. It is intended to provide.

[0007]

SUMMARY OF THE INVENTION The present invention is a coordinate input device for inputting the coordinates of a light-emitting body in a non-contact manner, and a plurality of one-dimensional photoelectric conversion elements installed in substantially the same plane, and the one-dimensional photoelectric conversion elements. A plurality of incident light limiting means provided corresponding to each of the elements to limit the incident light to the one-dimensional photoelectric conversion element in a direction twisted with respect to the extending direction of the one-dimensional photoelectric conversion element; It is characterized in that it comprises a calculation means for calculating coordinates based on the output of the three-dimensional photoelectric conversion element. Here, three one-dimensional photoelectric conversion elements may be provided as in the invention described in claim 2, and at least one of them may be arranged substantially perpendicular to the other one-dimensional photoelectric conversion elements. it can. Further, the plurality of incident light limiting means are constituted by a slit member having a slit-shaped opening as in the invention according to claim 3, and the direction in which the opening of the slit member extends corresponds to the one-dimensional photoelectric conversion element. The extending direction of the conversion element can be configured to be orthogonal to each other. Further, as in the invention described in claim 4, a filter that selectively transmits the wavelength of the light emitted by the light emitting body can be provided corresponding to the one-dimensional photoelectric conversion element.

The light-emitting body used in the above coordinate input device may have a light-emitting portion for emitting infrared light, as in the fifth aspect of the invention. Further, as in the invention described in claim 6, there is provided a light emitting portion composed of a substantially annular unit, and a reflection means or a light shielding means for reducing light leakage in the vertical direction of the central axis of the light emitting portion. It may be configured to include means.

[0009]

According to the present invention, the light emitted from the light-emitting body is applied to the plurality of one-dimensional photoelectric conversion elements as the positions of the light spots through the incident light limiting means, and the light is emitted to each one-dimensional photoelectric conversion element. The coordinates are calculated from the position of the intersecting point. by this,
You can enter the coordinates. Since the one-dimensional photoelectric conversion element is used, the device can be realized at low cost. At this time, a plurality of one-dimensional photoelectric conversion elements are arranged in substantially the same plane. As a result, for example, all the one-dimensional photoelectric conversion elements can be arranged in front of the desk, the space can be saved on the desk, and a hand can be inserted between the light emitter and the one-dimensional photoelectric conversion element to cast a shadow. This can be avoided, and good coordinate input can be performed. In addition, it enables you to read handwritten characters, input commands, and input instructions on any flat surface and space in the office, such as on a desk or in a meeting room, and handle a large amount of information or achieve smooth communication. it can. Further, as in the invention according to claim 2, three three-dimensional photoelectric conversion elements are used, and at least one of them is arranged substantially perpendicular to the other one-dimensional photoelectric conversion elements, whereby You can enter the coordinates.

Various structures can be used as the plurality of incident light limiting means, one of which is the third aspect.
As in the invention described in (1), it can be configured by a slit member having a slit-shaped opening. The slit member may be provided on the front surface of the one-dimensional photoelectric conversion element, taking up no space,
It is also possible to construct it integrally with the one-dimensional photoelectric conversion element. The direction in which the opening of the slit member extends may be a direction twisted with respect to the direction in which the corresponding one-dimensional photoelectric conversion element extends. In particular, the finest resolution can be obtained by making them orthogonal to each other. You can

According to the invention described in claim 4, 1
A filter that selectively transmits the wavelength of the light emitted by the light-emitting body can be provided corresponding to the three-dimensional photoelectric conversion element. With this filter, the influence of ambient light can be removed, and highly accurate reading can be achieved.

Furthermore, as in the invention described in claim 5,
The light-emitting body used in the above coordinate input device may be configured to emit infrared light. by this,
On the coordinate input device side, it is possible to remove the influence of ambient light such as normal visible light. At this time, in the coordinate input device, it is more effective to use a filter as in the invention described in claim 4 and to use a filter that transmits infrared light. Alternatively, even if a one-dimensional photoelectric conversion element having a sensitivity peak to infrared light is used,
Further effects can be obtained. Further, as in the invention described in claim 6, by providing a light emitting portion composed of a substantially annular unit and providing a reflecting means or a light shielding means, it is possible to input coordinates regardless of the direction of the light emitting body. Therefore, it is possible to reduce unnecessary light leakage and to efficiently cause the emitted light to enter the one-dimensional photoelectric conversion element of the coordinate input device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a basic configuration diagram showing an embodiment of a coordinate input device of the present invention. In the figure, 1-3 are PSD and 4-6
Is a slit, and 7 is an infrared LED. 3 PSD1
3 is a one-dimensional PSD, both of which are installed in the same plane. At this time, PSD1 and PSD2 are installed in parallel on a desk or the like in an office, for example.
3 can be installed perpendicular to them. Each PSD1
3 to 3 are provided with slits 4 to 6, respectively. The slits 4 to 6 are arranged so as to be orthogonal to the extending direction of the corresponding one-dimensional PSD. The three slits 4 to 6 can also be installed in the same plane with each other. The infrared LED 7 is provided on, for example, a pen tip, which will be described later, and emits infrared light.

The operation of coordinate detection in one embodiment of the coordinate input device of the present invention will be described below. Infrared LED7
The infrared light emitted from the slits is limited to the slit width when passing through the slits 4 to 6, and enters the PSDs 1 to 3, respectively. At this time, since the slit light is orthogonal to the extending direction of PSDs 1 to 3, only a part of PSDs 1 to 3 is irradiated. Infrared LE is obtained by detecting and calculating the positions irradiated by the slit light of PSDs 1 to 3, respectively.
The coordinate position where D7 exists can be obtained. In the following description, the extending direction of PSD1 and PSD2 is the x-axis, and PSD3 is
The three-dimensional coordinate position is obtained with the z-axis as the extending direction and the y-axis as the direction orthogonal to the x-axis and the z-axis.

FIG. 2 shows x-y according to PSD1 and PSD2.
It is explanatory drawing of the position detection of a plane. FIG. 2A is a perspective view,
FIG. 2B is a plan view. As shown in FIG. 2 (B),
The distance between the slits 1 and 2 and the PSDs 1 and 2 is d, the distance between the slit 1 and the slit 2 is L, the coordinates of the slit 1 are (0, 0), the coordinates of the slit 2 are (0, L), and the infrared LE.
The coordinates of D7 are (x, y). Further, in this state, the infrared light from the infrared LED 7 becomes d1 and PS of PSD1.
It is assumed that irradiation is performed on the position d2 of D2. At this time, the following equation holds based on the similarity of the triangles. d1 / d = x / y (1) d2 / d = (x−L) / y (2) From equation (1), y = x · d / d1 Substituting this into equation (2) d2 / D = (x-L) * d1 / d / x From this, x = d1 * L / (d1-d2) ... (3) y = d * L / (d1-d2) ... (4) is obtained. .

FIG. 3 is an explanatory diagram relating to the position detection of the z axis by the PSD 3. FIG. 3A is a perspective view and FIG.
Is a plan view. As shown in FIG. 3B, the slit 3
And PSD3, the distance between them is d, and the coordinates of the slit 3 are (0,
0), the coordinates of the infrared LED 7 are (x, y), and the infrared LE
It is assumed that the infrared light from D7 is applied to the position d3 of PSD3. At this time, the following equation holds based on the similarity of the triangles. d3 / d = z / y (5) From equation (5), z = y · d3 / d Substituting equation (4) above, z = d3 · L / (d1-d2) (6) ) Is obtained.

From the above, by using the equations (3), (4), and (6), x, y, and d are determined according to the values of the infrared light positions d1, d2, and d3 detected by the PSDs 1 to 3. The coordinates of z can be obtained. As described above, the three-dimensional coordinates can be input by the three one-dimensional PSDs arranged in substantially the same plane. A conventional example, for example, JP-A-54-116
The device can be made much smaller and integrated as compared with the case where the one-dimensional sensors described in Japanese Patent No. 258 are arranged so as to be orthogonal to each other. Moreover, since the calculation for obtaining the coordinates only uses a very simple formula as described above, the coordinate values can be obtained at high speed. Furthermore, one-dimensional PSD
Is inexpensive and can provide a coordinate input device at low cost. By the way, a two-dimensional PSD and a camera currently require about 200,000 yen, but a one-dimensional PSD costs about 300 yen.
Since it is 0 yen, it is about 10,000 yen even if three of them are used and the whole system is considered.

In the above structure, the infrared L
Although the ED 7 is used, in order to detect the infrared light from the infrared LED 7 satisfactorily, it is preferable that the PSDs 1 to 3 have the highest sensitivity in the infrared region. In that case, for example, other ambient light such as visible light can be removed, and only the light from the light-emitting body can be detected, and erroneous detection can be prevented. The light emitted by the light emitter is not limited to infrared light and may be light of other wavelengths, and PSDs 1 to 3 can be selected so as to have sensitivity according to the light emitted by the light emitter.

Further, it is possible to provide a filter corresponding to each PSD 1 to 3 so that the PSDs 1 to 3 receive only the light of a specific wavelength. In the example shown in FIG. 1, since the infrared LED 7 is used, PSDs 1 to 3 are infrared light only by using a filter that transmits infrared light and removes other light, particularly visible light. Can be received, and the coordinates can be detected without being affected by ambient light. Of course, when light of other wavelengths is used, a filter corresponding to the wavelength of the light used may be provided.

Further, the slits 4 to 6 have infrared LEDs 7
Since it only serves to limit the light emitted from the surroundings, it can be replaced by other means having such a function. For example, a mirror having the same width as the slit width may be provided and the reflected light may enter PSDs 1 to 3. In this case, the PSDs 1 to 3 are appropriately arranged at positions where the reflected light from the mirror can be received.

In the above-mentioned example, the PSDs 1 to 3 are on the same plane, but the principle is not limited to this. For example, each PSD 1 to 3 may be arranged with a certain angle so as to surround the user's hand. However, in this case, a somewhat complicated operation such as conversion of the coordinate system is required. It is also possible to use two of the PSDs 1 to 3 as an input device for two-dimensional coordinates. Further, PSDs 1 to 3 can use various one-dimensional photoelectric conversion elements such as one-dimensional CCD sensors.

An example of specific numerical values of the configuration shown in FIG. 1 is shown below. Here, a configuration in which a filter is added is shown. Infrared LED: SIR-5683ST (manufactured by ROHM) Light emission output: 16 mW Cutoff frequency: 12 MHz Half-value angle: ± 15 degrees Infrared transmission filter: Cut 800 nm or less (manufactured by Geomatic) Slit: Width 1 mm 1-dimensional PSD: S5730 (Hamamatsu Photonics) Light receiving surface: 0.7 × 24 mm Resolution: 0.4 μm / 24 mm (= 1/6000)
0) Sensitivity: 0.58 A / W Slit-to-one-dimensional PSD distance d: 10 mm With this structure, the infrared LED 7 outputs infrared light, half-value angle, slits 4 to 6 width, and one-dimensional PSDs 1 to 3 It is required that the position can be detected when the distance between the LED and the slit is up to 9.4 m. Also, the resolution is determined by the distance between the one-dimensional PSDs and the setting of x and y.
Even if the distance between the infrared LED and the slit is 9.4 m,
It has been confirmed that the resolution is as high as about 1 mm.
Therefore, for example, in the office, it is possible to input fine characters. Further, the present invention is not limited to offices and homes, and can be widely applied to high-resolution coordinate input.

FIG. 4 is a schematic sectional view showing an embodiment of the luminous body for a coordinate input device of the present invention. In the figure, 11 is a pen housing, 12 is a pen shaft, 13 is an infrared LED unit, 14 is a light shielding layer, and 15 and 16 are switches. Here, a structure in which a light emitting unit is provided in a ball-point pen or a mechanical pencil that is usually used is shown. At the tip of the pen housing 11, that is, at the pen tip, the infrared LED unit 13 arranged in a ring shape.
Is installed. This infrared LED unit 13
A battery inside the pen (not shown) can emit light.
Generally, when a light spot is detected by PSD, the position of the center of gravity of the light spot is detected. Therefore, by arranging the infrared LEDs in a ring shape, the center of gravity of the light spot changes even if the way the pen is held is changed. Therefore, it is possible to detect the position with high accuracy.

A light shielding layer 14 is provided on the tip of the pen. The light-shielding layer 14 can prevent ambient light due to light leaking to the tip of the pen being reflected from sheets such as paper. A reflection layer is provided on the light-shielding layer 14 side of the infrared LED unit 13, and the infrared LED unit 1 is provided.
The emitted light of No. 3 can be efficiently directed to the PSD.

The switches 15 and 16 are for switching the emission / stop of the infrared LED unit 13. Many ballpoint pens or mechanical pens generally have a structure in which the tip of the pen shaft 12 can be taken in and out. The switch 15 can be provided so as to interlock with the insertion and removal of the tip. If the infrared LED unit 13 is configured to emit light when the tip of the pen shaft 12 is projected, the locus of movement of the pen during writing is sequentially input as coordinates. When unnecessary, the pen shaft 12 is returned and the infrared LED unit 13 is turned off to prevent unnecessary battery consumption.

It is also possible to provide a switch 16 for detecting a pressure change or a movement amount of the pen tip. With this switch 16, it is possible to detect only the locus when the pen is actually pressed against a sheet such as paper, and it is possible to input only handwriting. That is,
The lines drawn on sheets such as paper will be input as they are. Further, by combining these two switches, it is possible to select three modes: handwriting only, trajectory detection only, and handwriting and trajectory detection simultaneously.

In the example shown in FIG. 4, the light emitted from the infrared LED unit 7 is directly radiated to the surroundings. However, for example, an optical fiber or the like can be used to approximate the light spot to the pen tip. it can. Further, it is possible to use light of other wavelengths instead of infrared light.

Further, a plurality of infrared LED units are provided and lighted in a specific order, or amplitude modulation, frequency modulation, phase modulation, etc. are performed to distinguish a plurality of pens, and further, the pens can be distinguished. It is also possible to add a key switch and operate it to transmit a signal. By using both infrared LED modulation and infrared transmission filter,
The influence of the ambient light can be removed, and the position can be detected even under the ambient light.

In the example shown in FIG. 4, a light-emitting body having the same structure as a ball-point pen or a mechanical pencil is shown, but the present invention is not limited to this. For example, if it is not necessary to actually write on a sheet such as paper, the pen can be used. It may have the same configuration as the light. Alternatively, the light emitting unit may be attached to a finger or the like, and a finger instruction may be input.

FIG. 5 is a perspective view showing an example of application of the coordinate input device of the present invention to a desk. In the figure, 21 is a PSD unit, 22 is a pen, 23 is a display, 24 is a keyboard, 25 is a desk, and 26 and 27 are virtual planes.
A display 23 and a keyboard 24 are provided on the desk 25.
And so on. The PSD unit 21 is a coordinate input device of the present invention, and for example, as shown in FIG.
A PSD and a slit are incorporated. Since the components such as the PSD are small as in the specific example described above, the PSD unit 21 can also be made small, and is attached to the upper portion of the display 23 here. Of course, it may be provided in another place. The pen 22 is, for example, a light emitting body as shown in FIG.

In the configuration shown in FIG. 5A, the desk 25
A virtual plane 26 is provided above. By moving the pen 22 on the virtual plane 26, it is possible to input handwritten characters / graphics, commands, or instructions. In this case, the PSD unit 21 may be configured so that, for example, a space of about 40 × 40 × 40 cm is used as the detection area.

The virtual plane 26 is a part of a wide range of three-dimensional space that can be detected by the PSD unit 21, and is merely assumed and recognized as a virtual plane. Therefore, the virtual plane may be set at any position. For example, the space above the keyboard 24 can be a virtual plane, and in that case, it is not necessary to provide a space for inputting on the desk 25. Also, FIG.
In (B), the virtual plane 27 is set as a plane perpendicular to the desk 25. In this way, not only the plane parallel to the desk 25 but also any plane can be set as the virtual plane. Further, in FIG. 5B, the virtual plane 26,
Two different virtual planes of 27 are set. In this case, the PSD unit 21 is, for example, 100 × 40.
It may be configured so that a space of about 40 cm is used as the detection area. Thus, the virtual plane is the PSD unit 21.
In a three-dimensional space where can be detected, it is possible to set an arbitrary number in arbitrary spatial positions in various modes.
Of course, since the PSD unit 21 can input three-dimensional coordinates, it can be used as it is as a three-dimensional coordinate input device.

FIG. 6 is a perspective view showing an application example of the coordinate input device of the present invention to a conference room. In the figure, the same parts as those in FIG. 5 are designated by the same reference numerals. 28 is a table. In this conference room, a large display 23 is provided in the front, and a plurality of attendees sit on the table 28. PSD
The unit 21 is provided on the ceiling of the conference room, and the virtual plane 26 is set in front of each attendee of the conference. These virtual planes 26 can set different virtual planes 26 for each attendee. In this example, PSD unit 2
1 may be configured so that, for example, a space of about 7 × 7 × 3 m is used as a detection area. The attendees of the meeting write, for example, on the virtual plane 26 in front of them with the pen 22,
The writing can be reflected on the large display 23. This allows attendees to freely add comments, questions, etc. to the presentation materials from any place in the meeting room because it was difficult for anyone other than the presenter to write or give instructions to the presentation materials. This makes it possible to effectively use the conference time and facilitate communication.

It is also possible to transmit information by blinking the light emitting body at the position of a certain attendee. At this time, it is possible to know from which of the attendees the information was transmitted by the position of the blinking light emitter.

FIG. 7 is a perspective view showing an application example of the coordinate input device of the present invention to a pen input type computer. In the figure,
The same parts as those in FIG. 5 are designated by the same reference numerals. Reference numeral 29 is a pen input type computer. Since the coordinate input device of the present invention can be configured in a small size as described above, it can be incorporated in a small pen-input type computer, for example. In FIG. 7, the PSD unit 21 is arranged on one side of the pen input type computer 29, and
The surface on which the unit 21 is arranged is set as a virtual plane 26. The pen 22 can also be used as the pen used for the input of the pen input type computer 29.

[0036]

As is apparent from the above description, according to the present invention, there is provided a coordinate input device which does not require a large area for input, is inexpensive, and allows easy and reliable input. You can By using this coordinate input device, for example, on an office desk, a conference room, or the like, work such as handwriting input on a computer screen, pointing, and command input can be performed with higher resolution.
It can be performed in real time on any plane and space. Therefore, it is possible to contribute not only to personal work but also to support creation, including groupware.

Further, since it can be used in a wide space such as a conference room or in the presence of ambient light, it is used not only as a substitute for a mouse on a desk, but also for a wide range of purposes, and it can be used in three-dimensional space. There is an effect that the position can be detected.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram showing an embodiment of a coordinate input device of the present invention.

FIG. 2 is an explanatory diagram of position detection on an xy plane by PSD1 and PSD2.

FIG. 3 is an explanatory diagram related to z-axis position detection by PSD3.

FIG. 4 is a schematic cross-sectional view showing an embodiment of the luminous body for a coordinate input device of the present invention.

FIG. 5 is a perspective view showing an application example of the coordinate input device of the present invention on a desk.

FIG. 6 is a perspective view showing an application example of the coordinate input device of the present invention to a conference room.

FIG. 7 is a perspective view showing an application example of the coordinate input device of the present invention to a pen input type computer.

[Explanation of symbols]

1-3 ... PSD, 4-6 ... Slit, 7 ... Infrared LED,
11 ... Pen housing, 12 ... Pen shaft, 13 ... Infrared LED unit, 14 ... Light-shielding layer, 15, 16 ... Switch, 21 ... P
SD unit, 22 ... Pen, 23 ... Display, 24
... keyboard, 25 ... desk, 26, 27 ... virtual plane,
28 ... table, 29 ... pen input computer.

Claims (6)

[Claims] 1. A coordinate input device for inputting the coordinates of a light-emitting body in a non-contact manner, wherein a plurality of one-dimensional photoelectric conversion elements are provided in substantially the same plane, and the one-dimensional photoelectric conversion elements are provided corresponding to each one. A plurality of incident light restricting means for restricting incident light to the one-dimensional photoelectric conversion element in a direction twisted with respect to the extending direction of the one-dimensional photoelectric conversion element, and based on the output of the one-dimensional photoelectric conversion element A coordinate input device comprising a calculation means for calculating coordinates. 2. The one-dimensional photoelectric conversion element is present in three, at least one of which is arranged substantially perpendicular to the other one-dimensional photoelectric conversion element. The coordinate input device described. 3. A plurality of the incident light limiting means are composed of slit members having slit-shaped openings, and the direction in which the one-dimensional photoelectric conversion element extends and the one-dimensional photoelectric conversion element corresponding to the extending direction. The directions in which the openings of the slit member extend are orthogonal to each other.
Or the coordinate input device according to 2. 4. The filter according to claim 1, wherein a filter that selectively transmits the wavelength of the light emitted by the light emitter is provided corresponding to the one-dimensional photoelectric conversion element.
The coordinate input device according to the item. 5. The luminous body for a coordinate input device used in the coordinate input device according to claim 1, further comprising a light emitting section that emits infrared light. 6. A light-emitting portion comprising a substantially annular unit, and a reflection means or a light-shielding means for reducing light leakage in the vertical direction of the central axis of the light-emitting portion. A light emitter for a coordinate input device used in the coordinate input device according to any one of claims 1 to 4.