JPH09229617A - Position detecting device and position detecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make adjustment easy at design and assembly, increase a light receiving quantity, and remove the influence of unwanted light. SOLUTION: A inclined type light shielding plate 2 is provided in an optical path through which a light 4 from a light source 3 is projected into a first photoelectric conversion element 1, and output dependent upon the direction of the light source 3 is obtained. By setting the angle between the surface of the first photoelectric element 1 and the inclined type light shielding plate 2 to be an appropriate angle θ, the light reflected on the surface of the element and the underside of the inclined type light shielding plate 2 is prevented from projecting again in the first photoelectric conversion element 1. By providing a plurality of this constitutions, two-dimensional or three-dimensional position detection becomes possible. By separately providing a second photoelectric conversion element, change of a light receiving quantity per unit area dependent upon the direction of incidence of light can be compensated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to position detection. For example, the present invention relates to position detection for performing pointing, handwriting input, command input, etc. on a desk in an office or a computer screen in a conference room using a pen with a light source.

[0002]

2. Description of the Related Art On an office desk or a meeting room,
Currently, when performing instructions and inputs such as pointing, handwriting input, and command input, a mouse, keyboard,
Alternatively, a tablet or a display that traces the screen with a pen is used. In order for the user to operate these devices, the operation area of each device is limited. However, as the amount of information increases and the opportunities to communicate with remote locations increase, the operation of multiple devices is made as simple and unlimited as possible to handle multiple screens and perform smooth communication. The technology for performing the operation becomes indispensable.

Desirably, the user is free to use only a simple device such as a pen, not limited to instructions and inputs on a specific plane, but a virtual plane in the space, a display surface, a desk, or the like. There is a desire to select and to give instructions and inputs. There is also a demand for a position detection device that detects the position of a pen or the like with high accuracy using a small device and a simple arithmetic expression.

To meet these demands, JP-A-55-56
As described in Japanese Patent Application Laid-Open No. 285, Japanese Patent Application Laid-Open No. 56-29778, and Japanese Patent Application Laid-Open No. 62-32487, there is one that detects a position on a plane using a dedicated tablet. Further, as described in Japanese Utility Model Publication No. 5-25525, a two-dimensional semiconductor position sensor (hereinafter, referred to as PSD:
There is a method for detecting a position on a plane by using a position sensing device (abbreviated as “Position Sensing Device”) and a lens. However, each of these devices requires a limited range of planar operation area.

Further, as a conventional technique relating to position detection or shape measurement in a three-dimensional space, there is Japanese Patent Laid-Open No. 3-150.
As described in Japanese Patent No. 623, etc., there is a device that detects a position or measures a shape in a three-dimensional space by using a plurality of two-dimensional PSDs and pinholes. The pinhole is positioned as an optical component with good straightness, but the absolute amount of light that passes through is small, so in principle it is not possible to obtain a sufficient amount of light and it is burdened with amplification at the output of the light source or the output of the photoelectric conversion element. However, the detection range is limited.

Further, as described in Japanese Patent Laid-Open No. 54-116258, there is one in which a plurality of one-dimensional CCDs are opposed to each other in a direction orthogonal to each other, but the positions where the one-dimensional CCDs are arranged are limited. Therefore, it is difficult to reduce the size and cost of the detection device.

As described in Japanese Patent Laid-Open No. 3-196326, there is a device using a lens and a two-divided pin photodiode. Since a lens is used, it is difficult to remove aberrations and make adjustments during assembly. It is difficult to detect an accurate three-dimensional position of a light emitting region that is away from the focus of the lens, and a correction circuit or a bitmap for correcting aberration is indispensable. If an accurate three-dimensional position is to be known using a zoom lens, a component for focusing and a process of focusing are required at the time of position detection.

As described in Japanese Patent Application Laid-Open No. 6-42919, there is one using a PSD and a light shielding means, but the calculation is complicated and it is difficult to realize with a normal circuit. Also, P
SD is suitable for light emitting area detection, but it is necessary to obtain a thin film having high uniformity in order to obtain an accurate current value without error from each of the 2 to 4 terminals. Therefore, the yield in the manufacturing process is reduced and the increase in cost is greatly affected. Therefore, replacement with a simple device is required. Further, in order to obtain an accurate current value, it is necessary to increase the amount of light to be emitted, which is extremely disadvantageous especially when combined with a pinhole that cannot obtain a large amount of light.

In these devices, the instruction or input area is limited to a specific 30 cm cube. In a range of several m3 or more, instructing or inputting with a small device and a simple arithmetic expression is
Currently it is not possible.

On the other hand, as a three-dimensional position detecting technique, a product name "FASTRAK" (Nissho Electronics), a product name "3D MOUSE" (Asahi Electronics) and the like are on sale. Product name "FASTRAK"
Uses a magnetic field, and the measurement range is as wide as about 3 m. However, when a magnetic substance exists within the measurement range and a distance about twice the measurement range, the magnetic field is distorted and an uncorrectable error occurs. Remains, the measurement conditions are limited. The product name “3D MOUSE” uses ultrasonic waves, but a lot of noise is generated due to the reflection of ultrasonic waves from surrounding walls and displays, and the measurement conditions are also limited.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and adjustments at the time of designing and assembling are easy, a large amount of received light can be obtained, and the influence of unnecessary light is reduced. An object of the present invention is to provide a position detecting device and a position detecting device to be removed.

[0012]

According to a first aspect of the present invention, there is provided a position detecting device, which has a light shielding means for shielding light from a light source and at least one first photoelectric conversion means. The photoelectric conversion means is installed at a position where a part of the light is shielded by the light shielding means according to the position of the light source, and the light shielding means receives the reflected light from the first photoelectric conversion means, The optical path of the reflected light is changed in a direction away from the first photoelectric conversion means.

According to a second aspect of the present invention, in the position detecting device according to the first aspect, the light shielding means is substantially flat and does not shield the at least one first photoelectric conversion means. It is characterized by being installed so as to be inclined to the side. Further, in the invention described in claim 3, in the position detection device according to claim 2, the angle formed by the light shielding means and the at least one first photoelectric conversion means is about 30 degrees. It is what

According to a fourth aspect of the invention, in the position detecting device according to any one of the first to third aspects, at least one second photoelectric conversion means is provided,
The second photoelectric conversion means is installed at a position where the light is not shielded by the light shielding means.

According to a fifth aspect of the present invention, in the position detecting device according to any one of the first to fourth aspects, a plurality of first photoelectric conversion means are provided, and a plurality of first photoelectric conversion means are provided.
The photoelectric conversion means is installed in substantially the same plane. According to a sixth aspect of the invention, in the position detecting device according to any one of the first to fifth aspects, the number of the first photoelectric conversion means is the same as the number of dimensions of the position of the light source to be detected. It is characterized by being.

According to a seventh aspect of the invention, in the position detecting device, the light source and any one of the first to sixth aspects are provided.
It has a position detection device described in the paragraph. Further, the invention according to claim 8 is the position detecting device according to claim 7, wherein the light source is provided on a moving body. According to a ninth aspect of the present invention, in the position detection device, the position of the light source is determined based on the position detection device according to any one of the first to sixth aspects and the photoelectric conversion output of the position detection device. It is characterized by having a position calculating means for calculating.

According to a tenth aspect of the present invention, in the position detecting device, a light source, a plurality of position detecting devices, and position calculating means are provided, and the position detecting device is the one according to the first aspect.
7. The position detecting device according to any one of claims 1 to 6, wherein the position calculating means is based on at least one photoelectric conversion output of each of the position detecting devices, and at least one of the plurality of position detecting devices. A position detecting device is selected, and the position of the light source is calculated based on the photoelectric conversion output of the selected position detecting device.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION First, the principle of position detection of a position detecting device and a position detecting device of the present invention will be described with reference to FIGS. The applicant of the present application has proposed a prior art based on this position detection principle in Japanese Patent Application No. 07-288794.
No. has been filed.

FIG. 8 is a plan view of the basic construction showing the position detecting principle of the present invention. FIG. 9 shows that FIG.
9B is an explanatory diagram showing the positional relationship between the light source and each part in FIG. 9A. FIG.
10A is a cross-sectional view taken along the xz plane of FIG. 8, and FIG. 10B is an explanatory diagram showing the positional relationship between the light source and each part in FIG. 10A. In the figure, 31 to 33 are first photoelectric conversion elements, 34 is second photoelectric conversion elements, 35 to 37 are light shielding plates, 38 is a light source, and 39 is an origin.

In this basic structure, the first photoelectric conversion elements 31 to 31 are provided at positions where a part of the light is blocked by the light blocking plates 35 to 37 for blocking the light from the light source 38 depending on the position of the light source 18.
33 is a three-dimensional position detection device in which 33 is installed. further,
The second photoelectric conversion element 34 is installed at a position where the light from the light source 38 is not blocked by the light blocking plates 35 to 37.

As shown in FIG. 8, in order to simplify the explanation, three first photoelectric conversion elements 31 to 33 and one second photoelectric conversion element 31 to 33 are provided.
The photoelectric conversion elements 34 are installed on the same yz plane, and these are the same rectangle having an end in the y-axis or z-axis direction. Light-shielding plates 35 to 37 are installed corresponding to the first photoelectric conversion elements 31 to 33 on a plane separated from the plane by a predetermined distance h in the x direction, and these are shielded in the y-axis or z-axis direction. Are the same rectangle with.

The first photoelectric conversion element 31 and the light shielding plate 35
Of the first photoelectric conversion element 32 and the light shielding plate 36 are opposed to each other in the y-axis direction and are orthogonal to the second photoelectric conversion element 32 and the light-shielding plate 36 in the z-axis direction.
The photoelectric conversion element 34 and the set of the first photoelectric conversion element 33 and the light shielding plate 37 are installed to face each other. The second photoelectric conversion element 34 has the same rectangular shape as the first photoelectric conversion elements 31 to 33.

As shown in FIGS. 9 (A) and 10 (A),
Non-directional light from the light source 38 is received by the first photoelectric conversion elements 31 to 33 via the light shielding plates 35 to 37, and the entire surface of the second photoelectric conversion element 34 is not transmitted via the light shielding plates 35 to 37. Is received by. At this time, the first photoelectric conversion elements 31 to 33
In the light incident direction, in other words, depending on the solid angle when the light source 38 is viewed from the respective positions of the first photoelectric conversion elements 31 to 33, the light shielding areas which are shaded by the light shielding plates 35 to 37 are Due to the change, the area of the light receiving region changes.
In the figure, the light shielding regions of the first photoelectric conversion elements 31 to 33 are filled with black.

The first photoelectric conversion elements 31 to 33 convert the total amount of light corresponding to the light receiving area into a current or a voltage and output it. The photocurrent of the first photoelectric conversion elements 31 to 33 may be converted into a voltage through the current-voltage converter. By calculating the current value or the voltage value obtained from each of the first photoelectric conversion elements 31 to 33, the one-dimensional position, the two-dimensional position, or the three-dimensional position of the light source 38 can be detected. First
The number of photoelectric conversion elements is 1 when detecting the one-dimensional position of the light source 38, 2 when detecting the two-dimensional position, and two when detecting the three-dimensional position. Three is enough.

Since the present invention, including other embodiments described later, does not use a lens, there is no need for a design considering the focal length and aberrations, and there is no difficulty in adjustment during assembly. Further, unlike the pinholes and slits, a method of simply shielding light from one end of the first photoelectric conversion elements 31 to 33 is adopted, and thus a large light receiving area can be taken. As a result, the amount of light is large, and it becomes possible to perform position detection in a wide range including a distant place.

9 (A) and 9 (B) show x-y.
Since it is a cross-sectional view of a plane, it only represents one cross section where z = 0, but in other cross sections parallel to the xy plane, the first photoelectric conversion elements 31 and 32 and the light shielding plate 35, Three
6 and the light source 38 have the same position and angular relationship on the cross section. The coordinates of the position of the light source 38 are (x,
y, z), but on such a cross section,
Since the position and the angular relationship are determined regardless of the z coordinate of the position of the light source 38, the light source 3 in FIGS.
The coordinates of the position 8 are shown as (x, y).

Similarly, FIG. 10A and FIG.
It is a cross-sectional view of the xz plane where y = 0, but the first photoelectric conversion element 33 is also shown in another cross section parallel to the xz plane.
And the light-shielding plate 37 and the light source 38 have the same position and angle relationship on the cross section. On the cross-section, the position and angle of the light source 38 are determined regardless of the y-coordinate. Therefore, in FIGS.
The coordinates of the position 8 are shown as (x, z).

However, in the light receiving surface of each of the first photoelectric conversion elements 31 to 33, even in the light receiving region, the unit depends on the distance from the light source 38, the direction of light incidence, the intensity of the light emitted from the light source 38, and the like. Since the amount of light per area changes,
This change also appears in the outputs of the first photoelectric conversion elements 31 to 33. As a result, an error occurs when detecting the position of the light source 38 based on the relationship between the incident direction of light and the light receiving area. Therefore, the second photoelectric conversion element 34 that receives the light from the light source 38 over the entire surface is provided, and by using this output,
Distance from the light source 38, direction of incidence of light, light source 38
It is possible to compensate a change in the amount of light per unit area depending on the intensity of the irradiation light.

Incidentally, the first and second photoelectric conversion elements 31 to 3
Since the positions of 4 are slightly different, the amount of light per unit area differs depending on the difference in the distance from the light source 38 on each light receiving surface, but this is slight. In this embodiment, the position is detected by utilizing the fact that the area ratio of the light-receiving region and the light-shielding region changes depending on the difference in the light incident direction on each light-receiving surface. However, this area ratio greatly changes depending on the difference in the incident direction of light on each light receiving surface due to the existence of the distance h,
The influence of the change in the amount of light per unit area due to the difference in the incident direction of light is relatively small.

As shown in FIG. 8, the first photoelectric conversion element 3
Originally, it is easier to calculate the ends of the first to the third sides of the first photoelectric conversion element 31 on the side of the origin 39.
Since each of 33 to 33 has a certain area, the origin 3
It is assumed that they are installed at a distance of a ₁ , a ₂ , and a ₃ from 9. In addition, the origin 3 of the first photoelectric conversion elements 31 to 33
The distance between the end on the 9 side and the end facing the end is L.
The second photoelectric conversion element 34 also has the same rectangular shape,
This is not always necessary as described later. There is no strict restriction on the distance from the origin 39 to the end on the side of the origin 39, and it does not need to be on the same plane as the first photoelectric conversion elements 31 to 33, and may be installed in the vicinity thereof.

As shown in FIGS. 9 (A) and 10 (A),
The light-shielding plates 35 to 37 include the first photoelectric conversion elements 31 to 33.
Is installed on a plane with a constant distance h in the x-axis direction from
As shown in FIG. 8, the same rectangular shape having ends in the y-axis or z-axis direction, and the ends of the light blocking plates 35, 36 on the origin 39 side are distances A ₁ , A ₂ from the origin 39 in the y-axis direction. , Are separated from each other by h in the x-axis direction, and the end of the light blocking plate 37 on the origin 39 side is separated from the origin by a distance A _{3 in} the z-axis direction and h in the x-axis direction. In addition, it is desirable that the light shielding plates 35 to 37 are sufficiently thin, or at least the ends on the side of the origin 39 have a sharp edge shape.

In the first photoelectric conversion element 31,
It is assumed that the boundary line between the light receiving area and the light shielding area is at a distance of d ₁ from the origin. Similarly, the boundary line in the first photoelectric conversion element 32 is at a distance of d ₂ , and the boundary line in the first photoelectric conversion element 33 is at a distance of d ₃ . Therefore, for example, the light source 3 is such that light is incident perpendicularly to the yz plane.
8 is sufficiently far away on the axis passing through the origin 39 and perpendicular to the yz plane, the light receiving surfaces of the photoelectric conversion elements 31 to 33 are respectively d ₁ = A ₁ and d ₂ from the origin 39. = A ₂ ,
With the position of d ₃ = A ₃ as a boundary line, the light receiving region and the light shielding region are divided.

Next, using FIG. 9 (B) and FIG. 10 (B),
The relationship between the position of each part and the position of the light source 38 will be described using mathematical expressions. Based on the optical path from the light source 38 to the first photoelectric conversion elements 31 to 33, the distances d _{1 to} d ₃ from the origin of the boundary line are obtained using the similarity of the triangle. First, in FIG. 9B, the following equation holds.

(D ₁ −y) / x = (d ₁ −A ₁ ) / h (d ₂ + y) / x = (d ₂ −A ₂ ) / h From this, x = −h · y / (d _{1 -A 1) + h · d} 1 / (d 1 -A 1) ... (1) y = (d 2 -A 2) · x / h-d 2 ... (2) (2) equation (1) Substituting into x = h · (d ₁ + d ₂ ) / (d ₁ + d ₂ −A ₁ −A ₂ ) ... (3) Substituting equation (3) into equation (2) yields y = (A ₁ · _{d 2 -A 2 · d 1)} / (d 1 + d 2 -A 1 -A 2) ... (4) is obtained. As described above, by obtaining the coordinates of x and y, first, the position can be detected in two dimensions on the xy plane.

Similarly, in FIG. 10B, the following equation holds. (D ₃ + z) / x = (d ₃ −A ₃ ) / h From this, z = (d ₃ −A ₃ ) · x / h−d ₃ (5) _{substituting, z = ((A 1 +} A 2) · d 3 -A 3 · (d 1 + d 2)) / (d 1 + d 2 -A 1 -A 2) ... (6) is obtained.

The outputs of the _first photoelectric conversion elements 31 to 33 are V _{1 to} V _3, and the output of the second photoelectric conversion element 34 is V ₀ . First and second photoelectric conversion elements 31 to 34
Since the output of is proportional to the area of each light receiving area,
The following equation holds. _{(D 1 -a 1) / L} = V 1 / V 0 (d 2 -a 2) / L = V 2 / V 0 (d 3 -a 3) / L = V 3 / V 0 From this, d ₁ = V ₁ · (L / V ₀ ) + a ₁ (7) d ₂ = V ₂ · (L / V ₀ ) + a ₂ (8) d ₃ = V ₃ · (L / V ₀ ) + a ₃ … ( 9)

Substituting the equations (7) to (9) into the equations (3) to (6), x = h · (V ₁ + V ₂ + (a ₁ + a ₂ ) · V ₀ / L) / (V _{1 + V 2 + (a 1 +} a 2 -A 1 -A 2) · V 0 / L) ... (10) y = (A 1 · V 2 -A 2 · V 1 + (a 2 · A 1 -a 1 · _{A 2) · V 0 / L} ) / (V 1 + V 2 + (a 1 + a 2 -A 1 -A 2) · V 0 / L) ... (11) z = ((A 1 + A 2) · V 3 _{-A 3 · (V 1 + V} 2) + (a 3 · (A 1 + A 2) - (a 1 + a 2) · A 3) · V 0 / L) / (V 1 + V 2 + (a 1 + a 2 −A ₁ −A ₂ ) · V ₀ / L) (12), the coordinates of x, y, z are obtained.

Actually, the first and second photoelectric conversion elements 31 to 31
In the case of realizing an arithmetic circuit for obtaining x, y, z coordinates by using the outputs V _{1 to} V ₄ of 34, the first photoelectric conversion elements 31 to 33 of the first photoelectric conversion elements 31 to 33 are arranged in order to reduce an arithmetic error. The end portions on the origin side are all arranged at positions of a certain distance a from the origin in the xz plane, and the end portions on the origin side of the light shielding plates 35 to 37, that is, the first photoelectric conversion elements 31 to 33. The part projecting the boundary line above is arranged so that it is arranged at a position at a constant distance A in the y-axis or z-axis direction in the plane from the origin, and at a position h in the x-axis direction perpendicular to this plane. To do.

That is, it is desirable to simplify equations (10) to (12) as follows, assuming that A ₁ = A ₂ = A ₃ = A a ₁ = a ₂ = a ₃ = a. _{x = h · (V 1 +} V 2 + 2a · V 0 / L) / (V 1 + V 2 - (2A-2a) · V 0 / L) ... (13) y = A · (V 2 -V 1) / _{(V 1 + V 2 - (} 2A-2a) · V 0 / L) ... (14) z = A · (2V 3 - (V 1 + V 2)) / (V 1 + V 2 - (2A-2a) · V It can be expressed as ₀ / L) (15). Thus, by devising the arrangement of each element, the three-dimensional position of the light source can be detected using a simple circuit.

In addition, the first and second photoelectric conversion elements 31 to 3
It is desirable that the output of 4 be amplified and offset removed by an operational amplifier in order to reduce a calculation error.
The calculation is performed by converting the current or voltage into a digital amount by A / D conversion and then performing digital calculation, or
You may perform an analog calculation with an electric current or voltage using an operational amplifier.

In the above description, in order to simplify the calculation, the first and second photoelectric conversion elements 31 to 34 are regularly arranged on the same plane, and are arranged on a plane separated from the plane by a predetermined distance. Although the light shielding plates 35 to 37 are arranged regularly, the first and second photoelectric conversion elements 31 are described.
34 to 34 do not necessarily have to be regularly arranged on the same plane, and the same applies to the light shielding plates 35 to 37.
However, the light shielding plates 35 to 37 and the first photoelectric conversion element 31 to
33 is installed at a position where a part of the light is shielded according to the incident direction of the light from the light source 38, for example, at a position where the areas of the light receiving region and the light shielding region on the first photoelectric conversion element change. However, it is necessary to change the above-mentioned formula according to the arrangement.

The first photoelectric conversion elements 31 to 33 do not necessarily have to have the same rectangular shape. The same applies to the light shielding plates 35 to 37. Even if the respective shapes and sizes are different from each other, the boundary line between the light receiving area and the light shielding area is regularly moved according to the incident direction of light from the position of the light source 38, and therefore the position coordinates of the light source 38 are calculated. Can be asked. When the boundary line between the light receiving area and the light blocking area moves on the light receiving surface according to the incident direction of the light from the light source 38, the shape of the boundary line is always constant without depending on the incident direction of the light.
For example, the light-shielding plates 35 to 37 should be straight lines of a certain length.
If the shapes and the installation positions of the first photoelectric conversion elements 31 to 33 are determined, the position coordinates of the light source 38 can be obtained by directly modifying the above equation or slightly modifying it.

The second photoelectric conversion element 34 compensates for a change in the amount of light per unit area depending on the incident direction of light in the light receiving region, and therefore may have any shape. In equations (13) to (15) described above, the value of the coefficient (V ₀ / L) need only be changed according to the area of the light receiving surface of the second photoelectric conversion element 34.

In the above description, the second photoelectric conversion element 3
The case where 4 is used has been described. The second photoelectric conversion element 34 is required to detect the position with high accuracy. But,
In some cases, there is no problem in practical use without using the second photoelectric conversion element 34. When the amount of light per unit area is known in advance, for example, the position to be detected by the light source 38 is limited to a narrow range, or when a slight relative position change from the reference position of the light source 38 is detected. is there. On the contrary, when the position of the light source 38 to be detected is limited to several places which are sufficiently distant and the position detection accuracy may be low, the output changes of the first photoelectric conversion elements 31 to 33 are large and the unit area is large. The change in the amount of light per hit is only an error.

In addition, the first photoelectric conversion element 31 and the light shield plate 3
The set of 5 and the set of the first photoelectric conversion element 32 and the light shielding plate 36 are arranged line-symmetrically. In this case, when the light source 38 is distant and the x-coordinate value is large, the incident angle of the light seen from the first photoelectric conversion element 31 and the first photoelectric conversion element 32.
Since the incident angles of the light seen from above are equal, the area of the light receiving portion on the first photoelectric conversion element 31 and the second photoelectric conversion element 32 are
The sum of the areas of the light receiving portions of is substantially constant regardless of the incident direction, and is equal to the area of the light receiving portion of the second photoelectric conversion element 34. Therefore, in such a case, instead of the output V ₀ of the second photoelectric conversion element 34, the output V 1 of the first photoelectric conversion element 31 and the output V ₁ of the second photoelectric conversion element 32.
It is also possible to use the sum of _two . In reality, since the light source 38 is not sufficiently far away, an error occurs, but this method can also be used for applications in which position detection accuracy may be low.

Photodiodes (PD), for example, are used for the first and second photoelectric conversion elements 31 to 34.
The photoelectric conversion element is not limited to the photoelectric conversion element and may be any photoelectric conversion means.
Further, by using the entire current of the one-dimensional PSD as an output, the one-dimensional PSD can be used as a photodiode. Since the resolution of the light quantity of a general photodiode is 1 / 30,000, for example, a distance of 60 cm is 0.02 mm / dot and a distance of 6 m is 0.2 mm / dot.
It can be decomposed at a very high density of dot.
The light from the light source 38 is preferably non-directional, but even if it has directivity, if the directivity does not change so much due to the difference in the positions of the first and second photoelectric conversion elements 31 to 34,
Only a slight error occurs.

According to the basic structure described with reference to FIGS. 8 to 10, the position detection can be performed by using a simple device by fully utilizing the linearity of light and the characteristics of the photoelectric conversion element. However, a part of the incident light to the first photoelectric conversion elements 31 to 33 is reflected on the surface of the photoelectric conversion element and further reflected on the back surface of the light shielding plate, and re-enters the first photoelectric conversion elements 31 to 33. Therefore, it was found that the accuracy of position detection is improved.

FIG. 11 is an explanatory diagram of the problems of the above-mentioned basic configuration. In the figure, the same parts as those in FIG. When the angle formed between the element surface of the first photoelectric conversion element 31 and the surface of the light shielding plate 35 is parallel or nearly parallel, the light from the light source 38 is partially in the first direction, although it depends on the incident direction. In some cases, the light is reflected by the element surface of the photoelectric conversion element 31, and a part of the light is reflected by the lower surface of the light shielding plate 35, and is incident on the first photoelectric conversion element 31 again.

When a black thin plate is used as the light shielding plate 35, since the lower surface is also black, a small amount of light is absorbed and re-incident, but this is not preferable in order to improve the accuracy of position detection. Further, when a highly reflective metal thin film such as aluminum is used as the light shielding plate 35, the re-incident light will adversely affect the accuracy of position detection unless the back surface is blackened with paint or the like. .

FIG. 1 shows a first position detecting device according to the present invention.
1A is a front view, and FIG. 1B is a plan view. In the figure, 1 is a first photoelectric conversion element, 2 is an inclined type light-shielding plate, 3 is a light source, 4 is light, and 5 is a normal line to the surface of the element. By installing the inclined type light shielding plate 2 in the optical path in which the light 4 from the light source 3 enters the first photoelectric conversion element 1, an output depending on the direction of the light source 3 is obtained from the first photoelectric conversion element 1. .

At this time, the slant type shading plate 2 is installed so as to be slanted on the non-shielded side of the first photoelectric conversion element 1, and the angle between the element surface of the first photoelectric conversion element 1 and the slant type shading plate 2 is set. When θ is set, by setting this angle θ to an appropriate angle, it is possible to prevent the light reflected on the element surface and the lower surface of the inclined type light shielding plate 2 from re-entering the first photoelectric conversion element 1. As a result, it is possible to eliminate the influence on the output of the first photoelectric conversion element 1. At this time, the intersecting line of the inclined type light-shielding plate 2 or its extension surface and the surface of the first photoelectric conversion element element or this extension surface exists on the light receiving region side of the first photoelectric conversion element 1.

Although the one-dimensional position can be detected by the configuration shown in FIG. 1, by providing a plurality of these configurations and arranging them in the same arrangement as the basic configuration described with reference to FIGS. 8 to 10. A two-dimensional or three-dimensional position can be detected, and by providing a second photoelectric conversion element separately, it is possible to compensate for a change in the amount of received light per unit area depending on the incident direction of light.

2 and 3 are explanatory views of the operation of the position detecting device of the present invention. In the figure, the same parts as those in FIG. 4a and 4b are first and second
Is the light. In order to prevent re-incidence to the first photoelectric conversion element 1, as shown in FIG. 2 (A), when the inclined type light shielding plate 2 is installed at an angle θ, the light 4 is emitted on the lower surface of the inclined type light shielding plate 2. The first photoelectric conversion element 1 can be reflected in a direction away from the first photoelectric conversion element 1. However, if the angle θ is set too large as shown in FIG. 2B, even the end of the first photoelectric conversion element 1 becomes effective. It may not be possible to use it.

That is, when the first photoelectric conversion element 1 intersects with the extension line of the inclined type light shielding plate 2 and there is a region D in the drawing, the light receiving area in the region D in the drawing does not change depending on the direction of the light ray 4. . Further, if the angle θ is too large, the measurable range according to the operation principle of the present invention becomes narrow. That is, the incident angle of the light 4 with respect to the normal line 5 on the element surface is (π / 2
If it is larger than −θ), the light 4 is incident from the back of the inclined type light shielding plate 2, which is out of the measurable range according to the operation principle of the present invention.

Here, as shown in FIG. 3A, the right end surface of the slant type light shield plate 2 is set on a vertical plane passing through the center of the first photoelectric conversion element 1, and the slant type light shield plate 2 is set. If the end of the first photoelectric conversion element 1 is set to be located on the extension line of, the area up to the end of the first photoelectric conversion element 1 can be effectively used and the measurable range becomes symmetrical. Further, when the angle θ is set to 30 degrees, the measurable incident angle range is widest to 60 degrees to the left and right, and
It is possible to prevent re-incident light on the photoelectric conversion element 1.

As shown in FIG. 3B, light having a smaller incident angle such as the first light 4a is more likely to be re-incident on the first photoelectric conversion element 1. However, when the angle θ is set to 30 degrees, even the first light 4a reflected by the lower surface of the inclined type light-shielding plate 2 deviates from the left end of the first photoelectric conversion element 1 to the left, so that it is re-incident. Does not occur. Further, the second light 4b having an incident angle that is parallel to the light shielding plate 4 comes into contact with the right end of the first photoelectric conversion element 1, and there is no useless portion on the first photoelectric conversion element 1. . Therefore, the one shown in FIG. 3 is one of the particularly preferable configurations.

Even if the angle θ is set to 30 degrees or more, the same effect can be obtained, but the range of the incident angle that can be detected becomes narrow. When the angle θ is less than 30 degrees, re-incident light occurs in the range where the incident angle is small, but the amount of light that is re-incident is originally small, so that it falls within the error range in applications where the position detection accuracy does not matter so much. Depending on the application, there may be no light with a small incident angle.

In the configuration shown in FIGS. 3A and 3B, when the first photoelectric conversion element 1 is arranged so as to be shifted to the right, the position detectable range becomes bilaterally asymmetric. However, even if the angle θ is a predetermined angle smaller than 30 degrees, when the first light 4a is reflected by the element surface of the photoelectric conversion element 1 and the lower surface of the inclined type light shielding plate 2, the first photoelectric conversion is performed. It is possible to deviate the left end of the element 1 to the left and prevent re-injection. In this way, the first photoelectric conversion element 1 can be arranged so as to deviate from the reflection direction of the reflected light on the lower surface of the light shielding plate.

When the same arrangement as that of the basic structure described with reference to FIGS.
The angles θ of the inclined light-shielding plates with respect to each of the first photoelectric conversion elements 31 to 33 do not have to be the same value and may be determined according to a desired position detectable range.
May include 0 degree.

The inclined light-shielding plate 2 may be a highly reflective metal plate, but the lower surface of the inclined light-shielding plate 2 is preferably a surface having a small reflectance. In the above description, the influence of reflection was explained by focusing on re-incident light of specular reflection, but reflection also includes irregular reflection. If reflection is unavoidable, a specular surface such as a specular surface may be preferable to a diffusely reflecting surface. Since a regular light-shielding plate has a large proportion of specular reflection, if the specular reflection light is made to deviate from the first photoelectric conversion element 1, almost no re-incidence occurs.

In the above description, the inclined light-shielding plate 2 is a flat thin plate, but the invention is not limited to this. As with the inclined light-shielding plate 2 of FIG. 3, the right end forms an angle of 30 degrees, but as a whole, Is a light-shielding plate having a curved surface that is convex upward, as long as it can change the optical path of specularly reflected light from the element surface in a direction deviating from the first photoelectric conversion element 1. Even if it is a flat light-shielding plate, when a light-shielding plate whose lower surface tends to reflect strongly in a specific direction or in a specific region is used, the first photoelectric conversion element is used similarly to the curved light-shielding plate described above. 1 may be arranged avoiding this specific direction or specific area.

In the vicinity of the edge of the light receiving surface of the first and second photoelectric conversion elements 31 to 34 shown in FIG. 8 and the first photoelectric conversion element 1 shown in FIG. There may be a factor of accuracy deterioration such as the linearity of the photoelectric conversion output being inferior to the other parts. In such a case, for example, a light-shielding plate is provided in contact with the light-receiving surface from the end portion to the portion having the accuracy deterioration factor, or because light-shielding paint is applied,
The position of the end of the photoelectric conversion element is substantially different from the actual end. Therefore, the inclined type light shielding plate 2 is provided so that the substantial end portion of the first photoelectric conversion element 1 is located on the extension line of the inclined type light shielding plate 2.

A plurality of configurations shown in FIGS. 1 to 3 are provided, and a second photoelectric conversion element is provided if necessary, and the same arrangement as the basic configuration described with reference to FIGS. 8 to 10 is provided. What was done was the first embodiment of the present invention. Next, an embodiment in which the configuration is slightly modified will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 4 shows a second position detecting device according to the present invention.
It is explanatory drawing of embodiment of this. In the figure, the same parts as those in FIG. Reference numerals 11 to 13 denote inclined light-shielding plates. This embodiment is shown in FIG.
After setting the location of the light shields 35-37 to the origin side,
The respective shading plates are slanted shading plates 11 to 13,
The individual tilt type light shields are similar to the tilt type light shields 2 described with reference to FIGS. The light receiving region and the light shielding region are opposite to the basic configuration shown in FIG. 8, but the coordinates of the three-dimensional position of the light source 18 can be obtained by using the same arithmetic expression. When there are two first photoelectric conversion elements that are shielded from light, the two-dimensional position of the light source can be detected.

The inclined type light shielding plates 11 to 13 may be combined and integrated to form a roof type. Also in the first embodiment, the inclined type light-shielding plate 2 can be connected to form one light-shielding plate. For example, it is replaced with a frame-shaped slanting type light shading plate having a rectangular center hole, and a second photoelectric device is placed under the center hole and at a position where the light from the light source is not blocked by the slanting light shading plate. The conversion element 34 is installed.

FIG. 5 shows a third position detecting device according to the present invention.
It is explanatory drawing of embodiment of this. In the figure, the same parts as those in FIG. 8 and FIG. In this embodiment, in the basic configuration described with reference to FIGS. 8 to 10, the light shielding plates 35 to 37 are inclined type light shielding plates 11 to 13, and the first photoelectric conversion elements 31 to 33 correspond to this. Each one of the inclined type shading plates 11 to 13 is set as one set, and the plurality of sets are installed apart from each other, and further, in close proximity to each set,
This is a position detection device in which one second photoelectric conversion element 34 is individually installed and a total of three second photoelectric conversion elements 34 are used.

By disposing the first photoelectric conversion elements 31 to 33 apart from each other, the incident directions of the light from the light source are relatively different between the photoelectric conversion elements 31 to 33. Accuracy is improved. But,
If the second photoelectric conversion element 34 is left as it is, even between the first photoelectric conversion elements 31 to 33 and the second photoelectric conversion element 34, the distance from the light source and the incident direction of light, The intensity distribution of the irradiation light of the light source will differ greatly.

In the basic configuration, the output of the second photoelectric conversion element 34 is used to compensate for the change in the light quantity per unit area depending on the distance from the light source and the like. That is, the position of the light source is detected by utilizing the fact that the ratio of the outputs of the first photoelectric conversion elements 31 to 33 and the second photoelectric conversion element 34 corresponds to the ratio of the respective irradiation areas or lengths. Therefore, if they are separated, the accuracy of position detection may deteriorate due to the difference in distance from the light source and the like.

Therefore, in this embodiment, the first photoelectric conversion elements 31 to 33 are individually adjacent to the second photoelectric conversion elements 34, and the first photoelectric conversion elements 31 to 33 are individually adjacent to each other.
3 and the second photoelectric conversion elements 3 close to each other.
By combining with the output of No. 4 and calculating, the output of the first photoelectric conversion elements 31 to 33 can be accurately associated with the irradiation area or length.

In this case, the V ₀ used in the equations (7) to (9) is not a value common to the first photoelectric conversion elements 31 to 33, but the individual second photoelectric conversions at the respective locations. Element 34
Will represent the output of Therefore, the arithmetic expressions after this expression will be modified. If there are two sets of the first photoelectric conversion element, the light shielding plate, and the second photoelectric conversion element that receives light over the entire surface, the two-dimensional position of the light source can be detected.

Finally, with reference to FIGS. 6 and 7, a specific example of the position detecting apparatus using the position detecting device of the present invention will be described. FIG. 6 is a perspective view of the position detecting device in which the three-dimensional position detecting unit is installed on the display.
FIG. 3 is a perspective view of a position detecting device that detects a wide range of three-dimensional positions. In the figure, 21 is a three-dimensional position detection unit, 22
Is a pen, 23 is a display, 24 is a keyboard, 25
Is a desk, and 26 and 27 are virtual planes.

In FIG. 6, three-dimensional position detection in a space of 80 × 40 × 40 cm is performed. On the desk 25,
A display 23, a keyboard 24, etc. are mounted. The three-dimensional position detection unit 21 incorporates the position detection devices of the first to third embodiments described with reference to FIGS. 1 to 5. Since the constituent elements are small, the three-dimensional position detection unit 21 can also be made small, and in this figure, as an example, the three-dimensional position detection unit 21 is mounted on substantially the same plane as the display 23, specifically, above the display 23. The pen 22 provided with a light source and the three-dimensional position detection unit 2 are provided without taking up space on the desk 25.
It is possible to avoid the shadow of the user's hand entering between 1 and 1.

In the illustrated example, the desk 25 and the desk 25
Virtual planes 26 and 27 are set on the planes perpendicular to, respectively. The user moves the pen 22 on these virtual planes 26 and 27 to perform pointing, for example, instruction of a specific point, command input, handwritten character,
It is possible to input figures. Since the three-dimensional position detecting device can output three-dimensional coordinates of the position of the light source, it can be used as it is as a three-dimensional coordinate input device.

The user can select the desk 2 according to the convenience.
5 or the input range in space or virtual planes 26, 27
Can be freely set in a space of 80 × 40 × 40 cm. For example, the surface in contact with the display 23 is set as a virtual plane and used as a touch panel, the virtual plane 26 is used as a tablet, and the virtual planes 27 are set in front of the two displays 23. , You can freely decide the input area.

The three-dimensional position detecting unit 21 does not necessarily need to incorporate a calculating means. For example, the analog output corresponding to the outputs of the first and second photoelectric conversion elements is transmitted to a signal processing device provided outside the unit, or is A / D converted and is transmitted to a signal processing device or a general-purpose device through a digital transmission path. The computer may be used to calculate the position coordinates of the light source or directly output the data indicating the display position of the cursor or the like.

The pen 22 is, for example, a ball-point pen or the like which is normally used and is provided with a light source. The infrared LED unit is attached to the tip of the pen housing, that is, the pen tip.
When the infrared LED units are arranged in a ring shape, the three-dimensional position detection unit 21 can be irradiated with light without being affected by how the pen 22 is held.

The light source mainly emits infrared light. Infrared light has a relatively small wavelength in a general work environment such as an office. Ambient light other than infrared light can be efficiently removed by providing an infrared transmission filter before the photoelectric conversion element. When the light source is pulse-lighted and the light intensity is modulated so that light pulses are generated at a predetermined cycle,
The disturbance light that appears as an offset component can be removed from the output of the photoelectric conversion element. Taking in the output of the photoelectric conversion element in synchronization with the pulse from the light source is more suitable for removing ambient light.

The distance between the infrared LED and the photoelectric conversion element is about 10
It has a resolution of at least about 1 mm even at a distance of m, and the position of the infrared LED can be detected even under ambient light by using the infrared transmission filter and the light intensity modulation of the infrared LED. It is possible to detect three-dimensional positions in a large conference room, not only as a substitute for the mouse.

It is not necessary to use a light source dedicated to the position detecting device. For example, the infrared emission for transmission of an infrared remote controller such as a remote control mouse, which is used as an input means of a notebook computer, may be used. In this case, since the three-dimensional position detection unit 21 receives the infrared light whose light intensity is modulated, demodulating the infrared light enables it to function as an input unit for other information.

Further, when the light intensity modulation is performed with a pulse having a predetermined cycle, the photoelectric conversion output is sampled on the light receiving side according to the pulse cycle by making the pulse cycle different for each light source even when there are a plurality of light sources. By doing so, the photoelectric conversion outputs of the light from the plurality of light sources can be distinguished, and the positions of the plurality of light sources can be detected selectively or simultaneously. When the pulse code is transmitted from the light source, the light source can be specified by discriminating the pulse code. When the position calculating means obtains the synchronizing signal from the light source side through the signal line, the process of distinguishing the light sources becomes easy.

FIG. 7 is a perspective view of a position detecting device for detecting a wide range of three-dimensional positions. In the figure, the same parts as those in FIG. 28 is a table. This position detecting device is provided with a plurality of three-dimensional position detecting units 21 in order to detect a wide range of three-dimensional positions, and performs more accurate position detection. An example of application to a conference room is shown.

In this conference room, a large display 23 is provided on the front, and a plurality of attendees are seated at the table 48. In particular, in order to detect handwritten characters with a high accuracy of 0.1 mm, the three three-dimensional position detection units 21
It is attached to a place where the distance from the pen 22 is always about 3 m, for example, the ceiling. Here, 3x3x
Three-dimensional position detection in a 3 m space is performed. By the way, even when the distance between the pen 22 and the three-dimensional position detection unit 21 is 10 m, the accuracy can be secured at 1 mm or more. A virtual plane 27 is set in front of each attendee of the conference.

At least one photoelectric conversion output in the three-dimensional position detecting unit 21 is compared among the three-dimensional position detecting units 21, and the three-dimensional position detecting unit 21 having the maximum output is selected by analog or digital calculation. To be done. The output calculated based on the photoelectric conversion output of the selected three-dimensional position detection unit 21 becomes the position detection output. For example, when the three-dimensional position detection unit 21 outputs the position calculation output itself, the output of the selected three-dimensional position detection unit 21 is used as the position detection output, and when the photoelectric conversion output is output, the selected three-dimensional position is output. The position calculation output calculated based on the photoelectric conversion output of the position detection unit 21 is used as the position detection output.

In this way, it is possible to select the three-dimensional position detecting unit 21 which is closest to the pen 22 and can detect the position with high accuracy. The number of three-dimensional position detection units 21 to be selected is not limited to one, and a plurality of photoelectric conversion outputs are selected, and the average value of the position detection outputs of the three-dimensional positions obtained from them is calculated to obtain the position detection output. You can also do it. As the photoelectric conversion output for comparison described above, for example, the output of the second photoelectric conversion element 34 in FIG. 8 or
It is also possible to use the sum of the outputs of the first photoelectric conversion elements 31 to 33. At the same time, it is also possible to exclude the three-dimensional position detection unit 21 in which one of the outputs of the first photoelectric conversion elements 31 to 33 becomes equal to or less than a predetermined output.

Here, depending on the orientation of the pen 22, even the selected three-dimensional position detecting unit 21 has the first and second positions shown in FIG.
The output of the second photoelectric conversion elements 31 to 34, for example, the output of the second photoelectric conversion element 34 may become small and approach the detection limit or may be less than this. In such a case, on the display screen of the large-sized display 23, the cursor or the like displayed at the position corresponding to the position of the pen 22 stays at an unintended position. Therefore,
In such a case, the display of the cursor or the like on the display 23 may be erased, or the display position may be held at the previous position to display a cursor of a different color or shape, or may be displayed at a specific predetermined position. You can avoid confusion by making changes.

Similar to the position detecting device of FIG. 6, it is possible to set a plurality of virtual planes 27 for pointing and the like of a plurality of displays 23 (not shown). These virtual planes 27 can set different virtual planes 27 for each attendee. Attendees at the meeting can write on the virtual plane 27 in front of them with the pen 22
The writing can be reflected on, for example, the large display 23. As a result, a large amount of information can be handled and smooth communication can be realized. In the past, it was difficult for anyone other than the presenter to write or give instructions to the presentation materials, so it was possible to add comments, questions, etc. to the presentation materials from any place in the meeting room, and Effective use and smooth communication can be realized.

The position detecting device of the present invention is a general one-dimensional or three-dimensional position detecting device, and not only detects the position of the light source but also detects the position of the reflection point by utilizing the reflection of the light emitted from the light source. You can also do In this case, the reflection point is substantially the light source. Further, it can be applied to the technology related to virtual reality. For example, by installing a light source or a reflector on a part of the user's body, it becomes an input device for detecting body movement or gesturing. Further, by tracing a pen or the like along the object, it also serves as an input device for a three-dimensional object shape recognition device.

[0088]

According to the first aspect of the present invention, there is provided a light blocking means for blocking the light from the light source and at least one first photoelectric conversion means, and the first photoelectric conversion means is the light blocking means. Is installed at a position where a part of the light is shielded according to the position of the light source, and the light shielding means receives the reflected light from the first photoelectric conversion means and deviates the optical path of the reflected light from the first photoelectric conversion means. Since it is changed in the direction, there is an effect that a design considering the focal length and the aberration of the lens is not necessary, the adjustment at the time of assembly is easy, and the amount of received light can be increased.
A part of the incident light to the first photoelectric conversion element is reflected on the surface of the photoelectric conversion element and further reflected on the back surface of the light shielding plate, and again the first photoelectric conversion element is formed.
There is an effect that it is possible to prevent the light from re-entering the photoelectric conversion element.

According to the invention described in claim 2, since the light shielding means is substantially flat and is installed so as to be inclined to the side not shielded from the at least one first photoelectric conversion means, it is simple. With the configuration, there is an effect that the optical path of the reflected light from the first photoelectric conversion means can be changed in a direction away from the first photoelectric conversion means.

According to the third aspect of the invention, since the angle formed by the light shielding means and the at least one first photoelectric conversion means is about 30 degrees, the distance from the end of the first photoelectric conversion element 1 to There is an effect that it can be used effectively and the measurable range can be expanded symmetrically.

According to the invention described in claim 4, at least one second photoelectric conversion means is provided, and the second photoelectric conversion means is installed at a position where light is not blocked by the light blocking means. Therefore, the distance from the light source and the direction of the light,
There is an effect that it is possible to compensate a change in the amount of light per unit area depending on the intensity of the irradiation light of the light source.

According to the invention described in claim 5, since the plurality of first photoelectric conversion means are provided and the plurality of first photoelectric conversion means are installed in substantially the same plane, the position of the light source can be changed. This has the effect of facilitating detection.

According to the invention described in claim 6, the number of the first photoelectric conversion means is the same as the number of dimensions of the position of the light source to be detected, and therefore the position of the light source is detected with a small number. The effect is that you can.

According to the invention described in claim 7, since the light source and the position detecting device according to any one of claims 1 to 6 are provided, the position detecting device adapted to the characteristics of the light source such as the wavelength of the light source. There is an effect that can be used.

According to the invention described in claim 8, since the light source is provided in the moving body, there is an effect that the position of the moving body can be detected in real time. Therefore, it is possible to detect the position change such as the moving direction, speed, and acceleration of the moving body. For example, when the moving body is a pen, it becomes possible to input handwritten characters and figures, or to input commands and point in real time. Further, as described in Japanese Patent Application Laid-Open No. 6-42919 described in the related art, when the moving body is an unmanned vehicle or a spacecraft, a position such as an optical guidance device of the unmanned vehicle or docking of the spacecraft. It can be used for control, etc.

According to the invention of claim 9, claim 1
A position detecting device according to any one of 1 to 6;
Since it has the position calculation means for calculating the position of the light source based on the photoelectric conversion output of the position detection device, there is an effect that the position can be easily detected.

According to the tenth aspect of the present invention, the position detecting device has a light source, a plurality of position detecting devices, and position calculating means, and the position detecting device is the position detecting device according to any one of the first to sixth aspects. The position calculation means selects at least one position detection device from the plurality of position detection devices based on at least one photoelectric conversion output of each of the position detection devices, and the photoelectric conversion of the selected position detection device is performed. Since the position of the light source is calculated based on the output, there is an effect that the position can be detected with higher accuracy than in the case where only one position detecting device is used.

[Brief description of drawings]

FIG. 1 is a partial view of a first embodiment of a position detection device of the invention.

FIG. 2 is an operation explanatory diagram of the position detection device of the present invention.

FIG. 3 is an operation explanatory diagram of the position detection device of the present invention.

FIG. 4 is an explanatory diagram of a second embodiment of the position detection device of the invention.

FIG. 5 is an explanatory diagram of a third embodiment of the position detection device of the invention.

FIG. 6 is a perspective view of a position detection device in which a three-dimensional position detection unit is installed on a display.

FIG. 7 is a perspective view of a position detection device that performs three-dimensional position detection over a wide range.

FIG. 8 is a plan view of a basic configuration showing the position detection principle of the present invention.

9 is a cross-sectional view of the xy plane of FIG. 8 and an explanatory diagram showing a positional relationship between the light source and each part.

FIG. 10 is a cross-sectional view of the xz plane of FIG. 8 and an explanatory diagram showing a positional relationship between the light source and each part.

11 is an explanatory diagram of a problem of the basic configuration of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st photoelectric conversion element, 2, 11-13 ... inclination type light-shielding plate, 3, 38 ... light source, 4 ... light, 4a, 4b ... 1st, 2nd
Light, 5 ... Element surface normal, 21 ... Three-dimensional position detection unit, 22 ... Pen, 23 ... Display, 24 ... Keyboard, 25 ... Desk, 26, 27 ... Virtual plane, 31-3
3 ... 1st photoelectric conversion element, 34 ... 2nd photoelectric conversion element,
35-37 ... Shading plate, 39 ... Origin.

Claims (10)

[Claims] 1. A light shielding unit for shielding light from a light source, and at least one first photoelectric conversion unit, wherein the first photoelectric conversion unit uses the light shielding unit according to the position of the light source. Is installed at a position where a part of the light is shielded, the light shield means receives the reflected light from the first photoelectric conversion means,
A position detecting device, characterized in that an optical path of the reflected light is changed in a direction away from the first photoelectric conversion means. 2. The light-shielding means is substantially flat and is installed so as to be inclined to a side that does not shield light with respect to the at least one first photoelectric conversion means. Position detection device. 3. The position detecting device according to claim 2, wherein an angle formed by the light shielding unit and the at least one first photoelectric conversion unit is about 30 degrees. 4. At least one second photoelectric conversion means is provided, and the second photoelectric conversion means is installed at a position where the light is not shielded by the light shielding means. The position detection device according to any one of items 1 to 3. 5. A plurality of first photoelectric conversion means are provided, and the plurality of first photoelectric conversion means are installed in substantially the same plane. The position detection device described. 6. The position detection device according to claim 1, wherein the number of the first photoelectric conversion means is the same as the number of dimensions of the position of the light source to be detected. . 7. A position detecting device comprising a light source and the position detecting device according to claim 1. 8. The position detecting device according to claim 7, wherein the light source is provided on a moving body. 9. The position detecting device according to claim 1, and position calculating means for calculating the position of the light source based on a photoelectric conversion output of the position detecting device. Position detection device. 10. A light source, a plurality of position detecting devices, and position calculating means, wherein the position detecting device is the position detecting device according to any one of claims 1 to 6, wherein the position calculating means is Selecting at least one position detection device among the plurality of position detection devices based on at least one photoelectric conversion output in each of the position detection devices, and selecting the position detection device based on the photoelectric conversion output of the selected position detection device. A position detection device characterized by calculating the position of a light source.