JP2006029028A - Slat angle control device for electric blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slat angle control device for an electric blind capable of controlling the rotation angle of a slat according to solar incidence to the blind installed at an inclined window or a skylight. <P>SOLUTION: The slat angle control device for the electric blind outputting a control signal for controlling the rotation angle of the slat of the electric blind, is provided with an altitude/azimuth information acquisition means 40 for acquiring altitude information showing solar altitude to a mounting surface of the electric blind according to a date and time, and a slat rotation angle computing means 42 for computing the rotation angle of the slat from solar altitude information from the altitude/azimuth information acquisition means 40. The slat rotation angle computing means 42 computes the rotation angle of the slat to rotate the slat in a rotating direction coinciding with a change of solar altitude which varies with time, to reverse the slat in an opposite direction to the rotating direction when reaching a certain reference angle, and to rotate the slat again in the rotating direction after reversing it. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a slat angle control device for an electric blind that controls the rotation angle of the slat of the electric blind according to the incidence of the sun, and more particularly to a slat angle control device for an electric blind having an inclined window or a skylight as a mounting surface.

  Conventionally, as a slat angle control device for an electric blind, an apparatus that calculates and controls an optimum slat angle based on the solar altitude and the solar azimuth angle described in Patent Document 1 (Japanese Patent Laid-Open No. 8-4452) is known. Yes. In the slat angle control apparatus described in this publication, the incident angle of the sun at time T is calculated by a microcomputer, and the inclination angle of the plane including the upper slat outer edge and the lower slat inner edge becomes the calculated incident angle of sunlight. A slat inclination angle that is equal to or slightly smaller than the slat inclination angle is calculated, and the slat is set so as to be an angle calculated through the driver. As a result, a wide range of views can be obtained with the slats shielded from sunlight.

Japanese Patent Laid-Open No. 8-4452

  However, a blind installed in a normal vertical window can rotate the slats from 0 ° to 90 ° as the sun's altitude changes from 0 ° to 90 ° in the horizontal direction. However, in the case of blinds installed in inclined windows or skylights, the altitude of the sun must be able to correspond in the range of 0 ° to 180 ° at the maximum depending on the mounting surface. There is a problem that it can not cope.

  Moreover, in patent document 1, since the rotation angle of a slat is calculated | required by solving a trigonometric function, there exists a problem that processing time takes.

  The present invention has been made in view of such problems, and provides a slat angle control device for an electric blind capable of controlling the rotation angle of a slat according to the incidence of the sun with respect to a blind installed in an inclined window or a skylight. The purpose is to do. Another object of the present invention is to provide a slat angle control device for an electric blind that can simplify the process of determining the rotation angle of the slat and reduce the processing load.

In order to achieve the above-mentioned object, the invention according to claim 1 is a slat angle control device for an electric blind that outputs a control signal for controlling the rotation angle of the slat of the electric blind.
Altitude information acquisition means for obtaining altitude information representing the altitude of the sun with respect to the mounting surface of the electric blind according to the date and time;
Slat rotation angle calculation means for calculating the rotation angle of the slats from the altitude information of the sun from the altitude information acquisition means;
Control means for generating and outputting a control signal for controlling the rotation angle of the slat calculated by the slat rotation angle calculation means,
The slat rotation angle calculation means rotates the slat in a rotation direction that coincides with a change in the altitude of the sun that changes with time, and when a certain reference angle is reached, reverses the slat in a direction opposite to the rotation direction, After the inversion, the rotation angle of the slat is calculated so that the slat is rotated again in the rotation direction that coincides with the change in the altitude of the sun.

  According to a second aspect of the present invention, the slat rotation angle calculating means according to the first aspect is characterized in that, among adjacent slats, the outdoor side edge of the slat on the solar side and the indoor side edge of the slat on the anti-sun side. The rotation angle of the slats is determined so that the direction of the connecting straight line coincides with the altitude of the sun or is more parallel to the mounting surface than the angle coincident with the altitude of the sun. To do.

  According to a third aspect of the present invention, while the slat rotation angle calculating means according to the first or second aspect is rotated so that the slat approaches parallel to the mounting surface, The direction of the straight line connecting the outdoor edge of the slat on the sun side and the indoor edge of the slat on the anti-sun side coincides with the altitude of the sun at the time when the next control signal is output, or The rotation angle of the slat is determined so that the slat is more parallel to the mounting surface than the angle corresponding to the altitude of the sun.

  The invention according to claim 4 is characterized in that the reference angle according to any one of claims 1 to 3 is an angle when the direction of the sun is in a direction perpendicular to the mounting surface.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, when the slats are at a rotation angle perpendicular to the mounting surface, one of the slats is adjacent to each other. The theoretical angle ξ _{t1 is} the angle formed by the straight line connecting the outdoor side edge and the indoor side edge of the other slat and the horizontal plane is the angle formed by the straight line connecting the outdoor side edge of the other slat and the indoor side edge of one slat. When the theoretical angle ξ _{t2 (>} ξ _t1), and to the slat rotation angle calculating means, to the extent that high xi] of the sun satisfies ξ _t1 ≦ ξ ≦ ξ _t2, maximum while block the incident direct sunlight The rotation angle of the slat is determined so that the view can be obtained.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, when the slat is at a rotation angle perpendicular to the mounting surface, one of the adjacent slats. The theoretical angle ξ _{t1 is} the angle formed by the straight line connecting the outdoor edge of the slat and the indoor side edge of the other slat, and the straight line connecting the outdoor edge of the other slat and the indoor side edge of one slat is the horizontal plane. Assuming that the angle is a theoretical angle ξ _t2 (> ξ _t1 ), the slat rotation angle calculating means is configured so that the slat is in a range where the solar altitude ξ satisfies ξ _t1 > ξ and ξ> ξ _t2 with respect to the mounting surface. The rotation angle of the slat is determined to be a rotation angle that is vertical.

The invention according to claim 7 is a slat angle control device for an electric blind that outputs a control signal for controlling the rotation angle of the slat of the electric blind.
Altitude information acquisition means for obtaining altitude information representing the altitude of the sun with respect to the mounting surface of the electric blind according to the date and time;
Slat rotation angle calculation means for calculating the rotation angle of the slats from the altitude information of the sun from the altitude information acquisition means;
Control means for generating and outputting a control signal for controlling the rotation angle of the slat calculated by the slat rotation angle calculation means,
When the slat is at a rotation angle (= θ ₀ ) perpendicular to the mounting surface, the slat rotation angle calculation means is configured to detect the outdoor edge of one slat and the other slat. Theoretical angle ξ _{t1 is} the angle formed by the straight line connecting the indoor side edges with the perpendicular to the mounting surface, and the theoretical angle is the angle formed by the straight line connecting the outdoor side edge of the other slat and the indoor side edge of the one slat. An angle ξ _t2 (> ξ _t1 ) is established, and the outdoor side edge of one slat and the indoor side edge of the other slat are connected when the solar altitude ξ is an angle 90 ° −ψ in a direction perpendicular to the mounting surface. The rotation angle of a slat whose straight line coincides with the altitude of the sun is θ ₀₁ , and the rotation angle of the slat where the straight line connecting the outdoor side edge of the other slat and the indoor side edge of one slat coincides with the altitude of the sun is θ ₀₂ Then
The rotation angle θ of the slat

を満足する角度、またはその角度よりも取付面に対してより平行に近づく角度に決定することを特徴とする。

Or an angle that is more parallel to the mounting surface than that angle.

  According to the first aspect of the present invention, it is possible to obtain a view as much as possible in a state where the solar radiation is shielded by rotating the slat in the rotation direction that coincides with the change of the solar altitude and the reference. When the angle is reached, turn the slats in the opposite direction to the direction of rotation, and then rotate the slats again in the direction of rotation so that the slats are aligned with the solar altitude range and the solar radiation is appropriate. Can be shielded.

  According to invention of Claim 2, the rotation angle of a slat can be determined so that the maximum view can be obtained in the state which shielded the solar radiation.

  According to the third aspect of the present invention, the following control signal is output while the slat is rotating so as to approach parallel to the mounting surface, that is, while rotating in the direction in which the slat is closed. Incidence of direct sunlight occurs until the next control signal is output by rotating the slats in the direction of closing the slats so as to block the solar radiation in accordance with the time of day. Can be prevented.

  According to the fourth aspect of the invention, the slat shielding function can be sufficiently exhibited by reversing the slat centering on the time when the altitude of the sun is in the direction perpendicular to the mounting surface.

According to invention of Claim 5 and 6, the rotation angle of a slat can be made into the angle from which the maximum view is obtained, blocking the incidence of direct sunlight. In the range in which the altitude of the sun ξ satisfies ξ _t1 > ξ and ξ> ξ _t2 , direct sunlight does not enter, so the angle at which the view can be maximized can be obtained.

  According to the seventh aspect of the invention, the rotation angle of the slat can be determined by a simple calculation without using a trigonometric function, and the processing load can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an example of an electric blind slat angle control device according to the present invention, and FIG. 2 is an example of an electric blind in which slats are controlled by the slat angle control device of FIG.

  The electric blind 10 shown in FIG. 2 can be a tilted window having a known arbitrary configuration or a horizontal blind for a skylight. In the illustrated example, a plurality of ladder cords 12 are suspended from the head box 11, A number of slats 14 and bottom rails 15 are supported by the cord 12 in an aligned state. In addition, an elevating tape 16 that is an elevating member is suspended from the head box 11, and the elevating tape 16 is connected to a bottom rail 15 below the slat 14 through each slat 14. In addition, a guide wire 19 that passes through each slat 14 and maintains the slat 14 in an inclined state is stretched across the mounting surface.

  The upper ends of the vertical cords before and after the ladder cord 12 are connected to a rotating drum 18 in the head box 11, and the upper ends of the elevating tape 16 are connected to the elevating drum 20 in the head box 11 so as to be wound and unwound. Is done. A shaft 22 extending in the longitudinal direction passes through each of the rotary drum 18 and the lifting drum 20 in the head box 11. The shaft 22 is rotationally driven by a motor 24 disposed in the head box 11.

  The rotary drum 18 is connected to the shaft 22 via a clutch spring, and rotates with the shaft 22 within a predetermined angle range, while the elevating drum 20 cannot rotate relative to the shaft 22. , It always rotates together with the shaft 22. Therefore, when the motor 24 is driven to rotate the shaft 22 in a predetermined direction, the rotary drum 18 and the lifting drum 20 are rotated in the same direction. When the rotating drum 18 rotates to a predetermined angle, further rotation is prevented, and the rotating drum 18 idles between the shaft 22 by the clutch spring. As the rotating drum 18 rotates, a relative motion is generated between the vertical cords before and after the ladder cord 12 so that the slat 14 rotates. The predetermined angle at which the rotating drum 18 can rotate is the slat. 14 rotation angles are supported.

  Further, when the elevating drum 20 rotates, the elevating tape 16 is wound around the elevating drum 20 or unwound from the elevating drum 20 according to the rotation direction, and the bottom rail 15 and the slats 14 are raised or lowered. It can be done.

  A drive unit 26 is built in the head box 11.

  As shown in FIG. 1, the slat angle control device 30 for an electric blind according to the present invention centrally controls a plurality of electric blinds 10, and is activated at fixed intervals to obtain an optimal slat rotation angle. A control signal for control is transmitted to each electric blind 10 via the floor control device 28. The drive unit 26 of the electric blind 10 receives the control signal, drives the motor 24 via the motor driver, and rotates the slat 14. However, the slat angle control device 30 may be provided in each electric blind 10 to control the slat angle of each individual electric blind 10.

  As shown in FIG. 1, the slat angle control device 30 is configured by a computer and includes a CPU, a ROM, a RAM, etc., and performs data transfer, calculation, temporary data storage, main program storage, A control circuit 32 that performs processing according to a program, an I / O control circuit 33 that controls input / output of data between the drive units 26 of each electric blind 10, and a memory as storage means that stores data and programs 34 and a setting device 36 for setting the control timing.

  The control circuit 32 includes an automatic control unit 38 that performs automatic control processing of the degree of opening and closing of the electric blind 10 at a constant period, and altitude information and azimuth corresponding to the altitude and azimuth angle of sunlight in the period of the automatic control unit 38. Altitude / azimuth angle information acquisition means 40 for acquiring information, and slat rotation angle calculation means 42 for calculating the slat rotation angle in a cycle by the automatic control means 38.

  In the memory 34, the altitude of the sun with respect to the mounting surface 50 (the plane parallel to the longitudinal direction of the head box of the blind and the guide wire 19) to which each electric blind 10 is mounted at an arbitrary date and time. In addition, a table of altitude / azimuth angle information indicating the azimuth and timing information set by the setting device 36 are stored. However, instead of storing the altitude and azimuth of the sun as a table in the memory 34, the altitude / azimuth information acquisition means 40 calculates the altitude / azimuth of the sun by calculating from the latitude, longitude, date, time, and orientation of the mounting surface. It is also possible to determine the azimuth angle.

  Here, the altitude and azimuth angle of the sun are defined. In FIG. 3, when the perpendicular of the mounting surface 50 of the electric blind 10 is the X axis, the line parallel to the longitudinal direction of the slat 14 is the Y axis, and the axis orthogonal to the X and Y axes is the Z axis, In the claims, the solar altitude ξ is the angle of sunlight from a horizontal line H in the XZ plane. Further, the azimuth angle −φ of the sun is an angle from the X axis of sunlight on the XY plane. 3A shows the case of an inclined window, and FIG. 3B shows the case of a skylight.

  Next, the principle of calculation of the slat rotation angle performed by the slat rotation angle calculation means 42 according to the present invention will be described. In a horizontal blind for an inclined window or a skylight, it is necessary to change the rotation angle of the slat 14 according to the change of the altitude of the sun with time. Not only that, considering the distance that solar radiation crosses the surface of the slats due to changes in the azimuth angle of the sun, as shown in FIG. 4, when the azimuth angle of the sun is φ and the actual slat width is a, The theoretical slat width A, which is the distance that solar radiation crosses the surface of the slat, is

で定義される。以降、スラットの幅として、理論値Ａを用いることとする。勿論、太陽の方位角の変化による誤差が少ないと考えられる場合には、理論値Ａではなくスラットの幅ａを用いることも可能である。

Defined by Hereinafter, the theoretical value A is used as the width of the slat. Of course, when the error due to the change in the azimuth angle of the sun is considered to be small, it is possible to use the slat width a instead of the theoretical value A.

  As described above, it is necessary to rotate the slat 14 in accordance with the change of the altitude of the sun with the change of time, and depending on the orientation of the mounting surface 50 and its inclination angle (the angle from the horizontal plane is ψ), The changing range of the sun's altitude is different, but must accommodate a maximum of about 180 ° change.

  Therefore, in the present invention, in the side view of the electric blind 10 shown in FIGS. 8A (b) to 8B (d), the slat 14 is rotated in the rotation direction basically coinciding with the change in the altitude of the sun, so The view should be obtained while blocking the entrance to the room. When the altitude of the sun coincides with the direction perpendicular to the mounting surface 50, the slats 14 are inverted (FIGS. 8B (d) and 8 (e)), and the slats 14 again coincide with changes in the altitude of the sun. It is rotated in the rotation direction (FIG. 8B (e) to FIG. 8C (g)).

Next, the solar shading angle of the slat 14 that is rotated in order to obtain a view while blocking direct sunlight from entering the room will be described. First, in the explanation, the theoretical angle is defined. As shown in FIG. 5, when the slat 14 is at a rotation angle perpendicular to the mounting surface 50, a straight line connecting the outdoor side edge of one slat and the indoor side edge of the other slat in adjacent slats. theory angle xi] _t1 the angle between the horizontal _plane, a straight line connecting the interior side edge of the outdoor side edge and one of the slats of the other slat is to be defined angle between the horizontal plane and the theoretical angle ξ _{t2 (>} ξ _t1) . The theoretical angles ξ _t1 and ξ _t2 are calculated by using the theoretical value A and the pitch D of the slats 14.

と表すことができる。

It can be expressed as.

  As shown in FIG. 6, the solar radiation shielding angle of the slat 14 is a direction of a straight line connecting the outdoor side edge of the slat on the solar side and the indoor side edge of the slat on the anti-sun side among adjacent slats. Slat rotation angle θ (angle from the vertical plane (> 0) with respect to the vertical plane) so that is coincident with the solar altitude ξ, or so that the slat is slightly closed rather than coincident with the solar altitude ξ If it is determined, the solar radiation can be shielded and a view can be obtained.

  At this time, the following relationship holds between the rotation angle θ of the slat 14 and the altitude ξ.

  The solar radiation shielding angle θ can be determined so as to satisfy the expression (4) or (4 ′).

  As shown in FIGS. 8B (d) and (e), when the sun is in a direction perpendicular to the mounting surface 50, that is, when the altitude of the sun is ξ = 90 ° −ψ, between the adjacent slats 14, 14. The slat 14 on the sun side and the slat 14 on the anti-sun side are interchanged. By inverting the slat 14 in accordance with this interchange, the solar altitude ξ is always on the solar side. The rotation angle of the slat 14 can be controlled so that the direction of the straight line connecting the outdoor edge of the slat 14 and the indoor edge of the slat 14 on the anti-sun side coincides with the solar altitude ξ. The sun altitude or slat angle when the sun altitude ξ = 90 ° −ψ shown in FIGS. 8B (d) and 8 (e) is satisfied is referred to as a reference angle.

(4), (4) 'as an alternative to calculating the expression, in order to shorten the processing time calculated more simply, solar shading angle theta = theta ₀ when the sun is high theoretical angle xi] _t1 = Between 180 ° -ψ and the solar radiation shielding angle θ ₀₁ determined by the equation (4) when the solar altitude ξ as shown in FIGS. 8B (d) and (e) becomes the reference angle 90 ° -ψ, And the solar radiation shielding angle θ ₀₂ determined by the equation (4 ′) when the solar altitude ξ becomes the reference angle 90 ° −ψ and the solar radiation shielding angle θ = θ ₀ when the sun is at the altitude of the theoretical angle ξ _t2. The solar shading angle θ can also be determined so that the solar altitude ξ and the solar shading angle θ satisfy the proportional relationship between = 180 ° −ψ. This is expressed as follows (see FIG. 7).

The rotation angle altitude of the sun is, when xi] _t1 is smaller than, or when xi] _t2 greater than when in the substantially parallel close advanced to the mounting surface in other words, became vertical slats 14 relative to the mounting surface By doing so, the maximum view can be obtained without the incidence of the sun.

Theory angle xi] _t1, with xi] _t2, summarized control of the rotation angle θ of the slats is as follows (Figure 8A~ Figure 8C).
(I) ξ <ξ _t1 (FIG. 8A (a))
θ = θ ₀ = 180 ° −ψ

(Ii) When ξ _t1 ≦ ξ ≦ ξ _t2 (FIG. 8A (b) to FIG. 8C (g))
θ = Sunlight shielding angle
However, inversion at ξ = 90 ° −ψ (FIG. 8B (d) to FIG. 8B (e))

(Iii) When ξ _t2 <ξ (FIG. 8C (h))
θ = θ ₀ = 180 ° −ψ

7 illustrates that the azimuth angle of the sun does not change, that is, θ ₀₁ , θ ₀₂ , ξ _t1, and ξ _t2 are fixed, but in reality, the theoretical slat width A is Since it is a function of the azimuth angle of the sun, the values of θ ₀₁ , θ ₀₂ , ξ _t1 and ξ _t2 are not constant values, but are variables that change depending on the azimuth angle.

  In the automatic control means 38 of the control circuit 32, automatic control processing is performed according to the flowchart shown in FIG. First, the time T corresponding to the period for performing the automatic control is measured (step S102), and when the time T elapses, the slat rotation angle θ is determined by the slat rotation angle calculation means 42 (step S104), and the determined rotation is determined. A blind control signal for operating the electric blind 10 at an angle is output (step S106). The blind control signal is input to the drive unit 26, the slat 14 is rotated, and the time measurement is reset.

  Every time T, steps S102 to S106 are repeated to perform automatic control following changes in sunlight altitude and azimuth. The period T for performing the rotation angle control of the slat 14 is set by the setting device 36 as desired by the user. If it is too frequent, there is an adverse effect of being irritating or annoying. If it is too intermittent, followability to the altitude and azimuth angle of the sun will be deteriorated, so an appropriate time may be set.

  The calculation of the rotation angle of the slat is performed according to the flowchart shown in FIG.

  First, the altitude / azimuth angle information acquisition means 40 acquires the current date and time, and acquires the altitude and azimuth angle φ of the sun after the elapse of T from the present time and the present time with respect to the mounting surface of the electric blind 10 to be controlled. (Step S202). As described above, this acquisition may be obtained from a table or may be obtained by calculation.

Next, when the slat rotation angle calculation means 42 determines whether the acquired solar altitude ξ is smaller than ξ _t1 (step S204) or larger than ξ _t2 (step S206), and any of the conditions is satisfied. The angle of rotation of the slat is θ = 180 ° −ψ, that is, the slat 14 is perpendicular to the mounting surface (step S208).

  If neither condition is satisfied, it is determined whether ξ is increasing (or the slat 14 may have been rotated in the positive direction last time) (step S210). When ξ is rising, that is, when the sun is rising, it is determined whether ξ <90 ° −ψ, that is, whether the altitude is lower than the reference angle (step S212). The solar radiation shielding angle θ is determined from the solar altitude ξ and the azimuth angle φ after the elapse of T based on the above-described equation (4) or (5) (step S214). The reason is that the slat 14 is rotated so as to be closed. Therefore, if the slat 14 is not rotated so as to close excessively in advance so that the solar radiation shielding angle adjusted after the next timing T elapses, This is because there is a possibility that direct irradiation may occur by the next timing. On the other hand, when ξ> 90 ° −ψ (yes in step S216), after determining whether or not the rotation has been reversed (step S218), using the acquired current ξ and azimuth angle φ, (4 ') Or the solar radiation shielding angle θ is determined based on the equation (6) (step S220).

  When ξ = 90 ° −ψ, ie, the reference angle, or when it exceeds 90 ° −ψ without inversion (there may be some delay depending on the timing T, such delay is regarded as coincident with the reference angle. After the inversion (step S222), the solar radiation shielding angle θ is determined based on the equation (4 ′) or the equation (6).

  Next, when ξ is descending, that is, when the sun is descending (no in step S210), it is determined whether ξ> 90 ° −ψ, that is, whether the altitude is higher than the reference angle (step S224). If it is higher, the solar radiation shielding angle θ is determined from the solar altitude ξ and the azimuth angle φ after the elapse of T from the present time based on the above-described equation (4 ′) or (6) (step S226). The reason is that the slat 14 is rotated so as to be closed. Therefore, if the slat 14 is not rotated so as to close excessively in advance so that the solar radiation shielding angle adjusted after the next timing T elapses, This is because there is a possibility that direct irradiation may occur by the next timing. On the other hand, when ξ <90 ° −ψ (yes in step S228), after determining whether or not it has already been reversed (step S230), using the acquired current ξ and azimuth angle φ, (4 ) Or solar radiation shielding angle θ is determined based on equation (5) (step S232).

  When ξ = 90 ° −ψ, ie, the reference angle, or when it exceeds 90 ° −ψ without inversion (there may be some delay depending on the timing T, such delay is regarded as coincident with the reference angle. After the inversion (step S234), the solar radiation shielding angle θ is determined based on the equation (4) or (5).

  In the flowchart of FIG. 10 above, the angle determined by the equation (4), (4 ′), (5) or (6) is the solar radiation shielding angle. However, the angle is not limited to this and is larger than the angle obtained based on the equation. Further, by subtracting the predetermined angle θ so that the angle is slightly closed, it is possible to more reliably shield the solar radiation. Alternatively, when the rotation angle of the slat 14 can only take a discrete angle, the angle of the slat can be matched with the discrete angle with which the determined θ is closest. When the slat can only take a discrete angle, instead of obtaining the solar radiation shielding angle θ after the elapse of T in steps S220 and S232 in the flowchart of FIG. Thus, it is also possible to set the discrete angle of the next slat that makes the slat closer.

  As described above, the rotation angle of the slats of the electric blind suitable for the inclined window or the skylight can be appropriately controlled according to the azimuth and altitude of the sun.

It is a whole block diagram containing the electric blind controlled by the slat angle control apparatus by this invention. 1 is an overall view of an electric blind according to the present invention. It is explanatory drawing showing the definition of the altitude and azimuth of the sun, (a) represents the case of an inclined window, and (b) represents the case of a skylight. It is an explanatory top view explaining the theoretical slat width. It is an explanatory side view for explaining theoretical angles ξ _t1 and ξ _t2 . It is an explanatory side view showing the solar radiation shielding angle when the solar altitude is an arbitrary angle. It is a graph showing the relationship between solar altitude and solar radiation shielding angle. It is an explanatory side view showing the relation between rotation of the azimuth angle of the sun and rotation of the slats. It is explanatory side view showing the relationship between rotation of the azimuth of the sun and rotation of a slat following FIG. 8A. It is explanatory side view showing the relationship between rotation of the azimuth of the sun and rotation of a slat following FIG. 8B. It is a flowchart of an automatic control process. It is a flowchart of the rotation angle determination process of a slat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric blind 14 Slat 30 Slat angle control apparatus 34 Memory 40 Altitude / azimuth angle information acquisition means 42 Slat rotation angle calculation means

Claims (7)

In the slat angle control device for an electric blind that outputs a control signal for controlling the rotation angle of the slat of the electric blind,
Altitude information acquisition means for obtaining altitude information representing the altitude of the sun with respect to the mounting surface of the electric blind according to the date and time;
Slat rotation angle calculation means for calculating the rotation angle of the slats from the altitude information of the sun from the altitude information acquisition means;
Control means for generating and outputting a control signal for controlling the rotation angle of the slat calculated by the slat rotation angle calculation means,
The slat rotation angle calculation means rotates the slat in a rotation direction that coincides with a change in the altitude of the sun that changes with time, and when a certain reference angle is reached, reverses the slat in a direction opposite to the rotation direction, A slat angle control device for an electric blind, wherein the slat rotation angle is calculated so that the slat is rotated again in a rotation direction coinciding with the change in altitude of the sun after being inverted.   In the slat rotation angle calculating means, the direction of a straight line connecting the outdoor side edge of the slat on the solar side and the indoor side edge of the slat on the anti-sun side in the adjacent slats coincides with the altitude of the sun. Or the slat angle control of the electric blind according to claim 1, wherein the rotation angle of the slat is determined so as to be more parallel to the mounting surface than an angle coinciding with the altitude of the sun. apparatus.   While the slat rotation angle calculating means is rotating so that the slat is parallel to the mounting surface, the slat rotation angle calculating means is arranged on the outdoor side edge of the slat on the sun side and on the anti-sun side among the adjacent slats. The direction of the straight line connecting the indoor side edge of a slat is the same as the altitude of the sun at the time when the control signal is output next, or the slats with respect to the mounting surface than the angle that coincides with the altitude of the sun. The slat angle control device for an electric vertical blind according to claim 1 or 2, wherein the rotation angle of the slat is determined so that the slats are more parallel to each other.   The slat angle control device for an electric blind according to any one of claims 1 to 3, wherein the reference angle is an angle when the direction of the sun is in a direction perpendicular to the mounting surface. Theoretically, the angle formed by the straight line connecting the outer edge of one slat and the inner edge of the other slat to the horizontal plane among adjacent slats when the slat is at a rotation angle perpendicular to the mounting surface. If the angle ξ _t1 is the theoretical angle ξ _t2 (> ξ _t1 ), the angle between the straight line connecting the outer edge of the other slat and the inner edge of the one slat is the theoretical angle ξ _t2 (> ξ _t1 ), The rotation angle of the slat is determined so that the maximum view can be obtained while blocking the incidence of direct sunlight in a range where the altitude of the sun ξ satisfies ξ _t1 ≦ ξ ≦ ξ _t2. Item 5. The slat angle control device for an electric blind according to any one of Items 1 to 4. Theoretically, the angle formed by the straight line connecting the outer edge of one slat and the inner edge of the other slat to the horizontal plane among adjacent slats when the slat is at a rotation angle perpendicular to the mounting surface. When the angle ξ _t1 is the theoretical angle ξ _t2 (> ξ _t1 ), the angle between the straight line connecting the outer edge of the other slat and the inner edge of the one slat is the theoretical angle ξ _t2 (> ξ _t1 ), advanced xi] is xi] _t1> xi] of the sun, in a range satisfying xi]> xi] _t2, claims 1, characterized in that the slats determining the rotational angle of the slats to the rotation angle to be perpendicular to the mounting surface 5 The slat angle control device for an electric blind according to any one of the above. In the slat angle control device for an electric blind that outputs a control signal for controlling the rotation angle of the slat of the electric blind,
Altitude information acquisition means for obtaining altitude information representing the altitude of the sun with respect to the mounting surface of the electric blind according to the date and time;
Slat rotation angle calculation means for calculating the rotation angle of the slats from the altitude information of the sun from the altitude information acquisition means;
Control means for generating and outputting a control signal for controlling the rotation angle of the slat calculated by the slat rotation angle calculation means,
When the slat is at a rotation angle (= θ ₀ ) perpendicular to the mounting surface, the slat rotation angle calculation means is configured to detect the outdoor edge of one slat and the other slat. Theoretical angle ξ _{t1 is} the angle formed by the straight line connecting the indoor side edges with the perpendicular to the mounting surface, and the theoretical angle is the angle formed by the straight line connecting the outdoor side edge of the other slat and the indoor side edge of the one slat. An angle ξ _t2 (> ξ _t1 ) is established, and the outdoor side edge of one slat and the indoor side edge of the other slat are connected when the solar altitude ξ is an angle 90 ° −ψ in a direction perpendicular to the mounting surface. The rotation angle of a slat whose straight line coincides with the altitude of the sun is θ ₀₁ , and the rotation angle of the slat where the straight line connecting the outdoor side edge of the other slat and the indoor side edge of one slat coincides with the altitude of the sun is θ ₀₂ Then
The rotation angle θ of the slat

A slat angle control device for an electric blind, characterized in that the angle is determined to be an angle that satisfies the above or an angle that is closer to the mounting surface than the angle.

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