JPH084452A - Venetian blind slat angle controller - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a slat angle control device for a venetian blind that can adjust the slats of an electric venetian blind to a tilt angle that maximizes the view while blocking direct sunlight. [Composition] A motor for tilting the slat 20 and a driver for controlling the motor are provided in the electric venetian blind, and the sunlight incident angle JT with respect to the window surface at time T is calculated by the microcomputer to determine the outer edge of the upper slat 20.
21 and the slant angle β of the plane S including the inner edge 22 of the lower slat 20
Of the slat 20 is calculated by calculating a slat inclination angle αT that is equal to or slightly smaller than the calculated sunlight incident angle, and then the motor is rotated through a driver, thereby changing the inclination angle of the slat 20. Set to αT.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an automatic control device for adjusting the slat angle of an electric venetian blind.

[0002]

2. Description of the Related Art A device for automatically adjusting the slat angle of an electric venetian blind according to a predetermined pattern is known from Japanese Patent Laid-Open No. 169997/1993.
The known device is an opening / closing means for opening and closing the slat,
Clocking means for counting the current time, storage means for storing patterns and the like, instruction input means for inputting any one of the stored operation patterns, and operation patterns read out from the storage means and timing for the clocking means Control means for controlling the opening / closing means based on the data were provided, and the slats were opened or closed by rotating the slats 90 degrees back and forth.

[0003]

The optimum adjustment of the slat angle of the Venetian blind is to completely block the direct sunlight while keeping the outdoor view as much as possible. Since it is set so as to completely block direct sunlight regardless of the sun altitude, the slant angle of the slats with respect to the horizontal plane is large, and when the window hits directly, the outdoor view is substantially obstructed. Was made to solve this problem, and its purpose is to completely block the direct sunlight from the slat angle of the electric Venetian blind.
It is to provide a device that automatically controls so as to obtain a view as wide as possible.

[0004]

In order to achieve the above object, the means adopted by the present invention are, in an electric venetian blind equipped with a motor for tilting a slat, control means for tilting the slat and current time. An automatic control device comprising a time measuring means for measuring the time, a microcomputer, an input means for inputting a signal to the microcomputer, and a memory means written in or read by the microcomputer is provided, and the window for the current time is displayed by the computer. Calculate the incident angle of sunlight on the surface, and then calculate the slat inclination angle at which the inclination angle of the plane including the inner edge of the slat and the outer edge of the slat above it is equal to the incident angle of the slat. The slat tilt angle at which the motor is driven through the control means, and thereby the slat is calculated. In that so as to tilt.

[0005]

The longitude, latitude and window azimuth of the blind installation window are input to the microcomputer via the input means and written in the storage means. When the clocking means inputs the current month, day, and time to the microcomputer, the microcomputer calculates the incident angle of sunlight on the window surface at the current time. Next, the microcomputer calculates a slat inclination angle at which the calculated incident angle of sunlight is equal to or smaller than the inclination angle of the plane including the outer edge of the upper slat and the inner edge of the lower slat by a predetermined angle. Then, the microcomputer tilts the slat to the calculated slat tilt angle via the control means of the slat tilt motor.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in the drawings. As shown in FIG. 1, a control board 10 of the device is a microcomputer CPU, a clock CL connected to the microcomputer CPU, a driver DV for controlling a stepping motor 11 for tilting a slat of a single or a plurality of Venetian blinds, and a driver DV. A read-only memory ROM as storage means, a hexadecimal switch SW, power supply connectors C1 and C2, and a driver connector C3.
, A connector C4 for contact inputting the signal of the limit switch of the Venetian blind, a connector C5 for writing data from the personal computer or the like to the memory ROM via the microcomputer CPU, and the signal of the illuminance meter 12 as necessary. Connector C6 for inputting to the microcomputer CPU.

In this embodiment, a day is divided into three time domains according to the sun altitude and sun azimuth. Part 1
During the night, this is zone A in the dark. The second is bright, but the time when the direct sunlight does not reach a certain set distance indoors, this is designated as B zone. The third is the remaining time, which is the time when the direct sunlight reaches a certain set distance or more, and is defined as the C zone. In the A and B zones, there is no need to control the blind and the slat angle of the blind keeps some fixed angle. The blind controls in the C zone. Slat tilt angle control is the sun altitude, sun direction, latitude, longitude, year, month, day,
The angle of incidence of the sun on the window surface is determined from the hour and minute elements, and at this incident angle of sunlight, the slats completely block the direct rays of the sun and incline so that the maximum view can be obtained.

The zone A area from sunset to sunrise is set by the sun altitude. At this time, the slat inclination angle is constant. The zone B area from sunrise to sunset is outside the range of ± 90 ° with respect to the direction in which the window surface is facing, and within ± 90 °, the direct sunlight permitted on the window surface is not allowed. This is an area including the case where the reaching distance is within the set range. At this time, the slat inclination angle is horizontal (0 °).

From sunrise to sunset, c except zone B
The zone area is the control area. In order to completely block the direct sunlight, it is necessary to block the direct sunlight from entering between the slats. Considering the blocking of direct sunlight, the angle of slats that can be blocked is when the direction from the fully closed (+ 90 °, horizontal 0 °) to the bottom of the slat and the top of the next slat is the same as the incident light angle. It is the range of angles, and if it goes further horizontally, light will enter indoors. To get the maximum view possible, the blinds
It is necessary to be open to the maximum.

In order to automatically control the Venetian blind at a certain time, it is necessary to grasp the sun position. The sun position can be represented by a sun azimuth angle A and a sun altitude h. The sun azimuth angle A and the sun altitude h are given by the latitude φ, the declination δ, and the time angle t as follows. sinh = sin φsin δ + cos φcos δcos
t cosA = (sinh sin φ-sin δ) / cosh
cosφ From this, the sunlight incident angle J with respect to the window surface on which the Venetian blind is installed at a certain time is given by the following expression (1).

J = tan-1 [sinH / cosH / cos (A-F)] ... (1) where H is the solar altitude (radian) and A is the angle between the sun azimuth and the south (radian, South 0, West +,
East −) F is the azimuth of the window (radian, south 0, west +, east −) where the outer edge 21 of the upper slat 20 and the lower slat 20
If the inclination angle β of the plane S including the inner edge 22 and the horizontal angle is made equal to or slightly smaller than the sunlight incident angle J, the maximum view is realized under the condition of completely blocking direct sunlight. be able to. When the front-back width of the slat 20 is W, the vertical pitch is D, and the slat inclination angle is α, the inclination angle β of the plane S is given by the following equation (2).

Β = tan-1 (D / W cos α-tan α) ... (2) Then, if α is calculated with J = β, the slat inclination angle at which the maximum view with direct sunlight blocked is obtained. You can ask. For example, when the window faces south and the front-rear width W of the slats 20 is equal to the vertical pitch D, α = π / 2-2J.

If the longitude, latitude, azimuth, window width W of the slat, and vertical pitch D of the window with the Venetian blind installed in the memory ROM are input, the microcomputer CPU controls the date and time from the clock CL. , The time T is read, and the sun altitude HT and the sun azimuth angle AT at the time T are calculated. Then, calculate the sunlight incident angle JT shown in FIG.
Then, the inclination angle β of the plane S including the outer edge 21 of the upper slat 20 and the inner edge 22 of the lower slat 20 supported by the ladder cord 23 becomes smaller than the sunlight incident angle JT or a slight angle smaller than the incident angle JT. The slat tilt angle αT is calculated. Next, the microcomputer CPU is the memory RO
The step angle of the stepping motor 11 corresponding to the slat inclination angle at the next previous time is read from M, compared with the step angle corresponding to the calculated slat inclination angle αT, and the stepping motor 11 is rotated by the difference step angle. A command for moving is given to the driver DV. Based on the command, the driver DV rotates the stepping motor 11 and tilts the slat 20, so that the slat inclination angle becomes αT. Thus, in the C zone, the slat 20 of the Venetian blind is tilted at each predetermined time, and the slant angle of the slat is adjusted so that direct sunlight is always blocked and the maximum view is realized.

[0014]

As described above, the device of the present invention is different from the conventional slat which is controlled at two positions of opening and closing, and the slat inclination is adjusted according to the incident angle of sunlight with respect to the window surface at the time of control. Since the angle is controlled, direct sunlight from the window surface is completely blocked, but the outdoor view from the window surface has the excellent effect that it can be maintained to the maximum extent possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a control board of the device of the present invention,

FIG. 2 is a side view showing an essential part of a Venetian blind controlled by the device of the present invention,

[Explanation of symbols]

10: Board, 11: Motor, 12: Illuminometer, 20: Slat, 2
1: Slat outer edge, 22: Slat inner edge, 23: Ladder cord, C1, C2, C3, C4, C5, C6: Connector,
CL: Clock, CPU: Microcomputer, DV: Driver, ROM: Memory, SW: Switch

Claims (4)

[Claims] 1. A motor (11) for tilting a slat (20).
And a driver (DV) for controlling the motor, in a Venetian blind, a microcomputer (CPU) for controlling the driver, an input unit for inputting data to the microcomputer, and data by the microcomputer. A control device comprising a writing and reading storage means (ROM) and a clock means (CL) for inputting the current month, day, and time to the microcomputer is provided, and the control time is obtained from the sun position data on the Venetian blind installation window surface. The sunlight incident angle (JT) of the window surface where the Venetian blind is installed at T is calculated, and then a plane (S) including the upper slat outer edge (21) and the lower slat inner edge (22) of vertically adjacent slats. The inclination angle (β) is equal to or slightly smaller than the sunlight incident angle (JT). Angle to become the slat angle of inclination (α
A slat angle control device for a Venetian blind, characterized in that T) is calculated and then the slat inclination angle is set to the calculated angle (αT) via the driver (DV). 2. The slat angle control device for a Venetian blind according to claim 1, wherein the control time T is set to a time from sunrise to sunset. 3. The control device T is characterized in that the data of the illuminometer 12 is inputted and the slat (20) is set to be kept horizontal when the illuminance is below a predetermined value. A slat angle control device for the described Venetian blind. 4. A motor (11) for tilting a slat (20).
Is a stepping motor.
A slat angle control device for the described Venetian blind.