JP3521197B1 - Light source position tracking device and tracking method - Google Patents

Abstract

Kind Code: A1 A light source position tracking device and tracking method capable of appropriately tracking the movement of any light source regardless of the installation location. An irradiation surface (2a) irradiated with light (L) from a light source is provided.
A vertical / left / right motor for tilting the irradiation surface around two axes X and Y orthogonal to each other thereon; and a spherical surface arranged at equal intervals around the irradiation surface and formed in a spherical shape. The light receiving sensors 5a to 5d which can receive light along and output a light / dark detection signal, and which are provided close to the light receiving sensor on the irradiation surface, and when the irradiation surface is not orthogonal to the optical axis of the light source, A dark area generating member 6 for generating a dark area B serving as a shadow with respect to the light receiving sensor, a main sensor 7 provided on the irradiation surface and receiving a light irradiation from a light source and outputting a reference signal for comparison; And a control section for driving and controlling the up / down / left / right motors by comparing each of the detection signals with a reference signal for comparison from the main sensor.

Description

Detailed Description of the Invention 【Technical field】

The present invention relates to a light source position tracking device and a tracking method capable of appropriately tracking the movement of any light source regardless of the installation location.

[Background technology]

Conventionally, as a system for tracking a light source, for example, the sun, there are, for example, Patent Document 1 and Patent Document 2.
The one disclosed in the above is known. In Patent Document 1, the sunlight receiving portion is made to track the sun, and the sunlight receiving portion is rotated in the respective elevation angle directions of east and west and north and south by the driving means. The operation of the drive means is controlled by the control means based on the time information and the date information from the clock means. The clock means is adapted to receive the standard radio signal. Further, in Patent Document 2, a solar cell is made to follow the sun, and drive means for changing the direction of the solar cell, drive control means for controlling the drive means, output detection means for detecting the output of the solar cell, and drive control. It has a clock means for outputting date and time information to the means.

[Patent Document 1] Japanese Patent Laid-Open No. 2002-202817

[Patent Document 2] Japanese Patent Laid-Open No. 2002-261316

DISCLOSURE OF THE INVENTION

[Problems to be Solved by the Invention]

In any of these patent documents, a tracking system is constructed by using means for providing date and time information such as a clock means and a clock means in order to specify the position of the sun. If you change the installation location,
The complexity of having to change the settings made it difficult to track the sun anywhere on the earth. Also, not the sun whose operation is specified by the date and time,
It cannot be used when an arbitrary light source is tracked.

The present invention was devised in view of the above-mentioned conventional problems, and it is possible to properly track the movement of a light source regardless of its installation location and any light source. An object is to provide an apparatus and a tracking method.

[Means for Solving the Problems]

A light source position tracking device according to the present invention is a light source
The irradiation surface irradiated with the light from the
Tilt around each of the two axes that are orthogonal to each other in the plane
The tilting means and the circumference of the irradiation surface should be equidistant from each other.
TeteArranged and with the irradiation surface side and the irradiation surface
To the outside to receive the light on the opposite side.
It is provided so as to project,And the spherical surface
alongFrom almost all directionsIt can receive light and detects light and dark
The detection signalFour light-and-dark detection photo sensors that output
And bring the above illuminated surface close to each light / dark detection light receiving sensor.
And the irradiation surface is not orthogonal to the optical axis of the light source
A shadow on any of the light-and-dark detection light-receiving sensors.
On the irradiation surface, and a dark part generating member that creates a dark partStanding
Installed on the installed pillar member apart from the irradiation surface.
Is formed into a spherical shape and is almost entirely along the spherical surface.
It is possible to receive light from
Wider than areaIrradiation of light from a light sourceReceive lightComparison
Light sensor for comparison that outputs a reference signal for
Each detection signal from each detection light receiving sensor is
Compared with the reference signal for comparison from the comparison light receiving sensor
And a controller for driving and controlling the tilting means.
To do.

[0006]

[0007] Further, the light-dark detection light-receiving sensor is placed on the side opposite to the light-irradiated surface so as to block light which is incident on any of the light-dark detection light-receiving sensors from the opposite side of the light-irradiated surface. It is characterized in that a second dark part generating member for generating a dark part which becomes a shadow is provided.

Further, the dark portion generating member is characterized in that it is provided with a light shielding portion for preventing light from entering between the dark portion generating member and the light and dark detecting light receiving sensor.

Further, the invention is characterized by further comprising a limiter which detects that the tilting means has reached the movable range limit and stops the control of the tilting means by the control section.

Further, the control unit is characterized in that the tilting means for tilting the irradiation surface around two axes is tilt-controlled for each axis with a time interval.

Further, the control section receives a comparison reference signal from the comparison light receiving sensor and a detection signal from each of the light and darkness detection light receiving sensors, and compares the comparison reference signal with each detection signal. Perform the process to
A comparison calculation unit that outputs a determination result of whether each light-and-darkness detection light receiving sensor is located in the bright part or in the dark part,
And a calculation unit that outputs a control value for drive control to a driver that drives and controls the tilting unit according to a determination result from the comparison calculation unit.

A light source position tracking method using a light source position tracking device according to the present invention uses the light source position tracking device according to claim 1, wherein drive control of the tilting means for tilting the irradiation surface is performed by the control section. It is characterized in that it is executed based on only the detection signal and the comparison reference signal output by the light-dark detection light-receiving sensor and the comparison light-receiving sensor.

【The invention's effect】

In the light source position tracking device and the tracking method according to the present invention, since the time element is not used, the movement of any light source can be appropriately tracked regardless of the installation location. You can Also, pillar members
To remove the comparison light receiving sensor from the illuminated surface.
Since it was attached,
A wide detection area can be secured.

A preferred embodiment of a light source position tracking device according to the present invention will be described in detail below with reference to the accompanying drawings. As shown in FIGS. 1 to 5, the light source position tracking device 1 according to the present embodiment basically has an irradiation surface 2a on which the light L from the light source is irradiated and an irradiation surface 2a on the irradiation surface 2a. Vertical motor 3 and horizontal motor 4 as tilting means for tilting around two axes X and Y which are orthogonal to each other.
And arranged at equal intervals around the irradiation surface 2a.
The irradiation surface 2a side and the irradiation surface 2a are opposite to each other.
In order to receive the light L1 on the opposite side, outward from the irradiation surface 2a
Four light-reception sensors for detecting light and darkness, which are provided so as to project in a spherical shape and are capable of receiving light from almost all directions along the spherical surface, and which detect lightness and darkness and output a detection signal <br /> Upper / lower / right / left light receiving sensors 5a, 5b,
5c and 5d, and each light receiving sensor 5a-5 on the irradiation surface 2a.
a dark part generating member 6 that is provided close to d and that generates a dark part B that is a shadow for any of the light receiving sensors 5a to 5d when the irradiation surface 2a is not orthogonal to the optical axis of the light source; and the irradiation surface 2a. Whether the irradiation surface 2a is attached to the pillar member 10 standing upright
It is attached separately and is shaped like a sphere.
It is possible to receive light from almost all directions along the spherical surface,
From the main sensor 7 as a comparison light receiving sensor that receives the irradiation of the light L from the light source in a range wider than the hemispherical region on the irradiation surface 2a and outputs the comparison reference signal, and from the light receiving sensors 5a to 5d, respectively. And a control unit 8 for controlling the driving of the motors 3 and 4 by comparing each detection signal of 1) with the reference signal for comparison from the main sensor 7. Hereinafter, a case where the movement of the sun is tracked will be described as an example.

As shown in FIGS. 1 to 3, the irradiation surface 2a is formed flat on one surface of the rectangular plate member 2. This irradiation surface 2
At a, at least four upper light receiving sensors 5a, lower light receiving sensors 5b, right light receiving sensors 5c, and left light receiving sensors 5d are provided. These light receiving sensors 5a-5d
Is a sphere and is capable of receiving light from almost all directions along the spherical surface. Such light receiving sensors 5a to 5d are, for example, "KSPD1840C (trade name)" manufactured by Kyoto Semiconductor. And "KSPD16
A spherical sensor such as "40M (trade name)" can be adopted. Specifically, the light receiving sensors 5a to 5d are
The voltage value or current value according to the intensity of the detected light,
Output as a light / dark detection signal.

At least four light-receiving sensors 5a to 5d are provided for the purpose of specifying the irradiation surface 2a in space and the two axes X and Y orthogonal to each other on the irradiation surface 2a. That is, 2 on one axis X that is orthogonal to each other.
One sensor 5c, 5d and two sensors 5a, 5b are arranged on the other axis Y, so that a total of four sensors are provided. However, it goes without saying that four or more may be provided. In the illustrated example, these light receiving sensors 5a to 5d
Are arranged in an annular shape around the irradiation surface 2a, specifically, in the peripheral portion of the irradiation surface 2a at equal intervals, and four of them define the two axes X and Y.

Particularly in the present embodiment, these light receiving sensors 5a to 5d are provided around the irradiation surface 2a, whereby the solar cell panel 9a and the lens are provided on the entire irradiation surface 2a inside thereof. Various light collecting means such as the condensing device 9b used can be installed.
Further, the light receiving sensors 5a to 5d are the peripheral portions of the irradiation surface 2a,
Specifically, the light L is provided so as to project outward from the peripheral edge of the plate member 2, so that even when the light source exists not only on the irradiation surface 2a side but also on the opposite side to the irradiation surface 2a, the light L
1 can be received.

Although not shown on the irradiation surface 2a,
As tilting means for tilting this, two motors are provided: a vertical motor 3 for tilting vertically and a left and right motor 4 for tilting laterally. DC motors are adopted as the motors 3 and 4, and the two axes X and Y specified by the arrangement of the light receiving sensors 5a to 5d are used.
That is, the irradiation surface 2a is individually tilted about the vertical axis and the horizontal axis.

Further, each light receiving sensor 5 is provided on the irradiation surface 2a.
The dark space generating member 6 is provided close to a to 5d. In the illustrated example, these dark part generating members 6 are formed in a plate shape, and the light receiving sensors 5a to 5d are provided on the peripheral portion of the irradiation surface 2a in correspondence with the respective light receiving sensors 5a to 5d. Four pieces are provided so as to stand up substantially vertically from the irradiation surface 2a so as to be blocked. The height of the dark space generating member 6 may be set arbitrarily. Moreover, these dark part generation members 6 may be formed in one frame shape along the periphery of the irradiation surface 2a so as to connect the four. However, in order to secure a large amount of light on the irradiation surface 2a, it is preferable to install the dark part generating member 6 separately.

Since the dark space generating member 6 is erected and has a considerable height, when one of the dark space generating members 6 is not orthogonal to the optical axis of the sun, one of the dark space generating members 6 faces outward from the irradiation surface 2a. A shadow is formed, that is, a dark portion B that becomes a shadow with respect to any of the light receiving sensors 5a to 5d.
To generate. On the other hand, the light receiving sensor 5a that receives the light L without being shaded by the dark space generating member 6
-5d will be located in the bright part other than the dark part B.

The dark area generating member 6 includes light receiving sensors 5a ...
The light shielding portion 6a is provided at an appropriate position on the upper end side thereof which is separated from 5d.
Is formed. In the illustrated example, the light shielding portion 6a is formed integrally with the upper end of the dark portion generating member 6 so as to project toward the light receiving sensors 5a to 5d. However, you may make it provide in the middle of the height direction of the dark part production | generation member 6.

The light receiving sensors 5a to 5d should detect the light and dark states of the dark portion B produced by the dark portion producing member 6 and the bright portion which is not covered by the shadow of the dark portion producing member 6 and is irradiated with the light L. It is a kimono, but this light receiving sensor 5
Since a to 5d can receive light from all directions along the spherical surface, between the light receiving sensors 5a to 5d on the irradiation surface 2a side of the mounting position of the light receiving sensors 5a to 5d and the dark part generating member 6. There is a possibility that the light entering the space will also be received, which may reduce the detection accuracy. In the present embodiment, the light receiving sensor 5
In order to improve the detection accuracy by a to 5d, the light shielding portion 6a is provided for the purpose of blocking the light L entering between the dark portion generating member 6 and the light receiving sensors 5a to 5d described above.

A main sensor 7 is provided on the irradiation surface 2a as a light receiving sensor for comparison. In the present embodiment, the main sensor 7 is attached to the upper end of the pillar member 10 which is erected on the irradiation surface 2a and is separated from the irradiation surface 2a. The mounting height position may be set arbitrarily. The same main sensor 7 as the light receiving sensors 5a to 5d is used.

The main sensor 7 receives the irradiation of the light L, and thereby outputs a comparison reference signal used for comparison with the detection signals output from the light receiving sensors 5a to 5d. By comparing the correlation between the comparison reference signal and the detection signal, specifically, the magnitude relationship, the light receiving sensors 5a to 5a
It is possible to determine whether d is located in the dark area B or in the bright area. The position of the main sensor 7 with respect to the irradiation surface 2a is not limited to the center of the irradiation surface 2a, and may be set at a deviated position.

On the other hand, when the main sensor 7 is installed directly on the irradiation surface 2a, it can only receive the light L from the 360 ° hemispherical region spreading on the irradiation surface 2a, and for example when starting tracking. In addition, if the sunrise position of the sun as the light source is beyond this area, the main sensor 7 cannot receive light. In the present embodiment, since the pillar member 10 is provided to separate the position of the main sensor 7 from the irradiation surface 2a, the light receiving range of the main sensor 7 is wider than the hemispherical shape expanded by 360 °. The spherical region R can be used, and the main sensor 7 can detect a light source, for example, the light L from the sun, in a wider range regardless of the direction of the irradiation surface 2a with respect to the light source when starting tracking.

When the main sensor 7 and all the light receiving sensors 5a to 5d are located in the bright part, the tracking of the light source is properly completed and the irradiation surface 2a is orthogonal to the optical axis of the light source. Light receiving sensor 5a-5d
Means that the irradiation surface 2a is not orthogonal to the optical axis of the light source during the tracking process.

By the way, as described above, the main sensor 7 has a wider area than the hemispherical region of 360 ° on the irradiation surface 2a.
That is, the main sensor 7 can detect the incidence of the light L1 from the side opposite to the irradiation surface 2a. In this embodiment, the irradiation surface 2a is formed of the plate material 2, and the light L is emitted from the back surface 2b.
1 may be radiated, and at this time, the four light receiving sensors 5a to 5d appropriately emit light L from the side opposite to the irradiation surface 2a.
It may be possible that the light source 1 receives the light, and therefore, the light source may not be stably tracked. In this case, the light receiving sensors 5a to 5d are made to approach the light receiving surface 2a on the opposite side, and the light L1 to be incident on the light receiving sensor 5a to 5d from the opposite side of the light receiving surface 2a is blocked. It suffices to provide the second dark part generation member 11 that generates the dark part B1 that becomes a shadow.

The second dark part generating member 11 is formed in a plate shape similarly to the dark part generating member 6 on the irradiation surface 2a side, and has the irradiation surface 2a.
Four light-receiving sensors 5a to 5d are provided on the peripheral portion of the rear surface 2b of the irradiation surface 2a so as to stand substantially vertically from the rear surface 2b of the irradiation surface 2a. The height of the second dark part generation member 11 may also be set arbitrarily. These second dark part generating members 11 may also be formed in one frame shape along the periphery of the irradiation surface 2a so as to connect the four.

Since the second dark part generating member 11 is also erected and has a considerable height, any one of the second dark part generating members 11 casts a shadow toward the outside of the irradiation surface back surface 2b. That is, any one of the light receiving sensors 5a to 5
A dark portion B1 that becomes a shadow is generated for d. On the other hand, the light receiving sensors 5a to 5d, which are not shaded by the second dark part generating member 11 and receive the irradiation of the light L1, are located in the bright part. In addition, this second dark space generating member 1
Similarly to the dark part generating member 6, the light shielding part 11 a is formed on the first part 1.

By the second dark area generating member 11, when all the light receiving sensors 5a to 5d are located in the bright area, the main sensor 7 is located in the dark area B1 and is in the tracking state. When the sensor 7 is located in the bright area, any of the light receiving sensors 5a to 5d is always located in the dark area B1 and the tracking state is brought about in this case as well, so that the main sensor exceeds the 360 ° area on the irradiation surface 2a. Even when the light is received by the light sensor 7, the main sensor 7 and the light receiving sensors 5a to 5d are not affected by the incidence of the light L1 from the back surface 2b of the irradiation surface 2a.
The light source can be stably tracked by.

As shown in FIG. 4, the control unit 8 includes a comparison calculation unit 12, and a calculation unit 13 which is connected to the comparison calculation unit 12 and which is a PIC (manufactured by Microchip Technology Inc.) to which the output is input. , A motor driver 14 connected to the arithmetic unit 13 and receiving its output, and a motor speed adjustment control unit 15 connected to the motor driver 14 and receiving its output, which are supplied from a power supply unit 16. Operated at power supply voltage. Comparison calculation unit 12
Receives the comparison reference signal from the main sensor 7 and the detection signals from the upper, lower, left, and right sensors 5a to 5d, and executes a process of comparing each detection signal with the comparison reference signal. The upper, lower, left and right sensors 5a-5
It is determined whether d is located in the bright portion or the dark portion B, and the determination result is output to the calculation unit 13. For example, when the comparison reference signal and the detection signal are compared in voltage value, the difference in voltage value is output as the determination result.

The calculation unit 13 outputs the control value to the motor driver 14 based on the determination result. The motor driver 14 outputs the motor control value to the motor speed adjustment control unit 15. And the motor speed adjustment controller 15
Performs speed control correction processing on the motor control value and outputs a drive control signal to each of the vertical motor 3 and the horizontal motor 4. That is, the control unit 8 executes a process of comparing the detection signals from the light receiving sensors 5a to 5d and the main sensor 7 with the comparison reference signal, and controls the driving of the motors 3 and 4 according to the comparison result. Has become.

Further, the control unit 8 is provided with a limiter which detects that each of the motors 3 and 4 has reached the movable range limit and stops the control of the motors 3 and 4 by the control unit 8. This limiter is installed at the upper and lower limit positions of the upper and lower motors 3 and the left and right limit positions of the left and right motors 4 and is connected to the arithmetic unit 13 to detect that the motors 3 and 4 have reached the respective limit positions and detect signals. Up / Down / Left / Right limit switches 17a, 17b, 17
c, 17d. When the detection signals are input from the limit switches 17a to 17d, the calculation unit 13 stops the control of the motor driver 14, and specifically executes the control of retracting the motors 3 and 4 to the set retract positions as described later. To do. For this save control, the arithmetic unit 13
A retreat timer 19 that drives the motors 3 and 4 to rotate for a predetermined time during retreat is incorporated therein. As a result, the motors 3 and 4 can be controlled safely and smoothly.

Further, a night sensor 18 for detecting night when the sun is setting is connected to the arithmetic unit 13. The night sensor 18 is provided at an appropriate place other than the irradiation surface 2a, and outputs a detection signal to the calculation unit 13 by detecting a dark state. When the detection signal is input, the calculation unit 13 stops the calculation process for the input from the comparison calculation unit 12, and returns to the initial state, which is set inside, for example, the irradiation surface 2a is directed toward the sunrise. The control signal is output to the motor driver 14, so that the irradiation surface 2
a is returned to the initial state. This makes it possible to reliably and smoothly perform new tracking from the sunrise on the next day after tracking the sun until sunset.

Furthermore, the calculation unit 13 includes an irradiation surface 2a.
In order to control the tilting of each axis for each axis with a time interval, each motor 3 and 4 for tilting the irradiation surface 2a around the two axes X and Y is individually controlled with a time interval. A control shift timer 20 is incorporated. Two
When tilt control is performed around the axes X and Y at once, the motors 3 and 4 are
There is a possibility that hunting may occur in the control of 1., but by controlling for each axis in this way, it is possible to stably perform tilting control of the irradiation surface 2a. However, it goes without saying that the motors 3 and 4 may be simultaneously controlled by parallel processing according to a sequence.

The operation of the sun tracking device 1 having the above configuration will be described with reference to FIG. When the power of the power supply unit 16 is turned on, the control unit 8 is activated and the control operation is started. In the illustrated example, first, the control of the horizontal movement of the left and right is executed. First, the count of the control shift timer 20 is started for control for each axis (S
1) Then, first, it is determined whether the right limit switch 17c and the left limit switch 17d are ON (limit positions) (S2, S3), and then the right sensor 5
It is determined whether c is ON (bright) or OFF (dark) (S4). This judgment is executed by the comparison calculation unit 12. If it is ON, then the left sensor 5d
Is determined to be ON (bright) or OFF (dark) (S5). When it is ON, the left and right sensors 5
Since both c and 5d are present in the bright part where the light L is irradiated, it is not necessary to tilt the left and right motors 4, and the motors 4 are stopped (S7).

On the other hand, if it is OFF in (S4), then whether the left sensor 5d is ON (bright),
It is determined whether it is OFF (dark) (S6). When the left sensor 5d is ON, since the dark portion B by the dark portion generating member 6 is applied to the right sensor 5c, the left and right motors 4 are rotated to the left (S9), and the irradiation surface 2a is moved to the left side in the left and right direction. The right sensor 5c is tilted so that the right sensor 5c is located in the bright area. As a result, both the left and right sensors 5c and 5d can be positioned in the bright part in the left-right direction.

Further, in (S5), the left sensor 5d
Is OFF, the dark part B generated by the dark part generating member 6
Is applied to the left sensor 5d, the left and right motors 4 are rotated to the right (S8), the irradiation surface 2a is tilted to the right in the left-right direction, and the left sensor 5d is positioned in the bright part.

Further, in (S6), the left sensor 5
When d is OFF, both the left and right sides are present in the dark area B, and in this case, the control of the left and right motors 4 is stopped (S7).

With respect to the limiter, when the right limit switch 17c or the left limit switch 17d is ON, the time required for returning the irradiation surface 2a to the retracted position, for example, the neutral position of the left and right motors 4, is determined by the retract timer. Count at 19 (S10, S11), rotate the left and right motors 4 right or left until the count is up,
When the count is up, the motor 4 is stopped (S7).

In the vertical vertical movement control, the "right" is "up" and the "left" is "down" as in the horizontal movement control.
It is executed with the control content to be read as (S22 to S3).
1). As a result, the upper and lower sensors 5a and 5b are positioned in the bright area by the vertical motor 3 so that the irradiation surface 2
a is tilted. In particular, the control of the vertical movement is started after the control shift timer 20 is counted up, that is, at a time interval from the horizontal movement control (S1).

As described above, in the sun tracking device 1 according to the present embodiment and the sun tracking method executed by the sun tracking device 1, the tracking control using the date and time information provided is not required as in the conventional case. With respect to the movement of the sun or any light source, the light receiving sensors 5a to 5d on the irradiation surface 2a,
Based on the dark part generating member 6 that creates the dark part B depending on whether the irradiation surface 2a is orthogonal to the optical axis of the light source, the main sensor 7 that outputs the reference signal for comparison, and the reference signal and the detection signal for comparison. By combining the control units 8 that drive and control the motors 3 and 4, the tracking is executed based on the light L that is actually irradiated to the irradiation surface 2a or its periphery, so that the tracking can be performed anywhere on the earth. The movement of any light source can be appropriately tracked regardless of the installation location.

Particularly in this embodiment, since the light receiving sensors 5a to 5d are arranged around the irradiation surface 2a, for example, compared with the case where the light receiving sensors 5a to 5d are arranged on the irradiation surface 2a collectively. The detection accuracy of whether the light source is orthogonal to the irradiation surface 2a can be improved. Further, when a daylighting device or the like is installed on the irradiation surface 2a, the light receiving sensors 5a to 5d do not interfere, and a very wide installation space can be secured on the irradiation surface 2a.

Further, since the main sensor 7 is attached by the pillar member 10 so as to be separated from the irradiation surface 2a, the detection region R of the light L by the main sensor 7 can be widely secured. In addition, a second dark area generating member 11 that interrupts the light L1 that is incident from the side opposite to the irradiation surface 2a that serves as a reference surface for tracking the light source position and generates the dark area B1 for the light receiving sensors 5a to 5d is provided. Therefore, even if the detection region R by the main sensor 7 is widened, stable tracking control of the light source can be ensured.

[Brief description of drawings]

[0045]

FIG. 1 is a schematic perspective view showing a preferred embodiment of a light source position tracking device according to the present invention.

FIG. 2 is a side sectional view of the light source position tracking device of FIG.

3 is a plan view of the light source position tracking device in FIG. 1. FIG.

4 is a circuit diagram showing a configuration of a control unit applied to the light source position tracking device in FIG.

5 is a flowchart showing a control flow of the light source position tracking device in FIG.

[Explanation of symbols]

[0046] 1 Light source position tracking device 2a irradiation surface 3 vertical motor 4 left and right motors 5a Upper light receiving sensor 5b Lower light receiving sensor 5c Left sensor 5d Right light sensor 6 dark space generation member 6a, 11a light shielding part 7 main sensor 8 control unit 10 pillar members 11 Second dark space generating member 12 Comparison calculation part 13 Operation part 14 motor driver 17a Upper limit switch 17b Lower limit switch 17c Left limit switch 17d Right limit switch 20 Control shift timer B, B1 dark area L, L1 light X, Y Two axes that are orthogonal to each other on the irradiation surface

Claims (7)

(57) [Claims] 1. An irradiation surface on which light from a light source is irradiated, tilting means for tilting the irradiation surface around each of two axes orthogonal to each other on the irradiation surface, and the circumference of the irradiation surface are equal to each other. The irradiation surface side, which is arranged at intervals
And in order to receive the light on the side opposite to the irradiation surface,
Four bright and dark detections are provided that project outward from the irradiation surface, are formed in a spherical shape , and can receive light from almost all directions along the spherical surface, and detect bright and dark and output detection signals.
And use photosensors, provided in proximity to each intensity detection light receiving sensor on the irradiation surface, when said irradiated surface is not perpendicular to the optical axis of the light source, and shadows to any of該明dark detection light receiving sensor A dark part generating member that generates a dark part and a pillar member that is erected on the irradiation surface are separated from the irradiation surface.
Mounted on the sphere and formed into a spherical shape along the spherical surface.
It is possible to receive light from almost all directions, and
Of light from a light source over a wider area than the hemispherical area of
A comparative light-receiving sensor for outputting a comparison reference signal by receiving, compared with drive controlling the tilting means as comparison reference signal from the comparative light-receiving sensors each detection signal from each of the light and dark detection light receiving sensor A light source position tracking device, comprising: 2. A light sensor for light and darkness detection is provided on the side opposite to the irradiation surface so as to block light that is incident on one of the light and darkness detection light sensors from the opposite side of the light irradiation surface. The light source position tracking device according to claim 1, further comprising a second dark part generation member that generates a dark part that becomes a shadow. The method according to claim 3, wherein said dark portion generating member, and the light-shielding portion for preventing the penetration of light is formed into between the dark detection light receiving sensor to claim 1 or 2, characterized in this < The light source position tracking device according to the above description. 4. A detects that the tilting means has reached a movable range limit, claims 1 to 3, further comprising a limiter for stopping the control of the tilting means by said control unit
The light source position tracking device according to any one of items . 5. The control unit controls the tilting means for tilting the irradiation surface around two axes individually for each axis at a time interval .
The light source position tracking device according to the item . 6. The control unit receives a comparison reference signal from the comparison light receiving sensor and a detection signal from each of the light and darkness detection light receiving sensors, and compares the comparison reference signal with each detection signal. By performing the processing, the light-receiving sensor for each light and darkness detection outputs a determination result of whether the light-receiving sensor is located in the bright portion or in the dark portion, and according to the determination result from the comparison operation unit, 6. A calculation unit that outputs a control value for drive control to a driver that drives and controls the tilting unit .
The light source position tracking device according to the item . 7. The light source position tracking device according to claim 1, wherein the control unit outputs drive control of the tilting means for tilting the irradiation surface, by the light-dark detection light-receiving sensor and the comparison light-receiving sensor. A light source position tracking method using a light source position tracking device, which is executed based on only a detection signal and a comparison reference signal.