JPH11273879A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the optical output of a lighting load by reducing an effect of direct light of outdoor daylight. SOLUTION: This system is provided with a lighting load 8 for subjecting a definite surface in a closed space to irradiation, a sensor part comprising a first luminosity sensor 1a for detecting luminosity of the definite surface, a control part for controlling the optical output of the lighting load 8 by feeding back a detected value of the luminosity sensor, the first luminosity sensor for detecting a light A coming from outside the closed space into the first luminosity sensor by having it reflected by the definite surface, a light B coming from outside the closed space directly into the first luminosity sensor, and a light C coming from the lighting load into the first luminosity sensor by being reflected by the definite surface, and a second luminosity sensor 4 for detecting the light A and the light C, and the light B is detected by comparing the detected value of the first luminosity sensor and the detected value of the second luminosity sensor 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device.

[0002]

2. Description of the Related Art FIG. 6 is a schematic sectional view of a first conventional example according to the present invention.

[0003] This conventional example includes an illuminance sensor 1 mounted on a ceiling surface so that a light receiving surface faces downward, and an illuminating device 3 having an illumination load 2, and feeds back a detection value of the illuminance sensor 1. The light output of the illumination load 2 is controlled so that the average illuminance on the lower surface is substantially constant.

Here, the illuminance sensor 1 receives reflected light from the lower surface and estimates the illuminance of the lower surface. In other words, the illuminance sensor 1 receives reflected light reflected from the lower surface of the external light incident from the window and reflected light reflected from the lower surface of the output light from the illumination load 2 to estimate the illuminance on the lower surface. Is configured.

[0005]

However, the first conventional example has the following first problem.

When the illuminance sensor 1 is mounted near a window, daylight (external light) may directly enter the illuminance sensor 1 depending on the mounting position of the illuminance sensor 1, as shown in FIG. Despite the fact that the lower surface is dark and the reflected light from the lower surface is poor, it is erroneously determined that the lower surface is bright and is controlled in a direction to reduce the light output of the lighting fixture 8, and the illuminance of the lower surface does not reach a predetermined value. , Which is the first problem.

As means for solving the above-mentioned first problem, as shown in FIG. 7, there is provided a method for limiting the mounting position of the illuminance sensor 1 (second conventional example according to the present invention), and FIG. The light receiving lens of the illuminance sensor 1 is provided with a light-shielding sticker on the window side (third conventional example according to the present invention), and as shown in FIG. There is one in which a hood for shielding light is attached to the window side (a fourth conventional example according to the present invention). In any of the conventional examples, it is difficult for external direct light to enter the illuminance sensor 1.

However, the second to fourth conventional examples have the following second problem.

That is, in many cases, it is difficult to install the illuminance sensor 1 within the limit, and no countermeasure is taken in such a case. Depending on the third problem that the setting must be changed in accordance with the installation situation and it is troublesome, and depending on a device that controls a plurality of lighting devices by connecting them via a network or the like, the mounting of the illuminance sensor 1 is extremely large. The fourth problem is that it is difficult to install the position within the limit, and it is extremely troublesome to change the setting of the seal and the hood according to the installation condition of the illuminance sensor 1.

SUMMARY OF THE INVENTION The present invention has been made in view of all the above problems, and an object of the present invention is to provide a lighting device capable of controlling the light output of a lighting load by reducing the influence of direct light of external light. It is to be.

[0011]

According to the first aspect of the present invention, there is provided an illumination load for irradiating a fixed surface in a closed space and at least an illuminance for detecting the illuminance of the constant surface. A first illuminance sensor, and a control unit that controls a light output of the illumination load by feeding back a detection value of the first illuminance sensor, and that a light incident on the first illuminance sensor directly from outside the closed space is provided. Direct light detection means for performing detection is provided.

According to the second aspect of the present invention, the direct light detecting means reflects the light A reflected from a certain surface from outside the closed space and incident on the first illuminance sensor, and the first light directly from outside the closed space. The light B incident on the illuminance sensor is compared with the light C reflected on a certain surface from the illumination load and incident on the first illuminance sensor.

According to the third aspect of the present invention, light A and light B
A first illuminance sensor for detecting the light A and the light C; and a second illuminance sensor for detecting the light A and the light C. It is characterized by comparing with a detection value of an illuminance sensor.

According to a fourth aspect of the present invention, the direct light detecting means has a light shielding member for switching at least one of a light receiving direction and a light receiving amount of the illuminance sensor.

According to the fifth aspect of the invention, when the light B is detected, the light output of the illumination load is controlled by feeding back only the detection value of the second illuminance sensor.

According to a sixth aspect of the present invention, when light incident on the first illuminance sensor directly from outside the closed space is detected, the light output of the illumination load is controlled to a low level.

According to the seventh aspect of the invention, when light incident on the first illuminance sensor directly from outside the closed space is detected, the light output of the illumination load is controlled to a high level.

According to the eighth aspect of the present invention, the third illuminance sensor is provided in the closed space, and when light incident on the first illuminance sensor directly from outside the closed space is detected, the third illuminance sensor is provided. The optical output of the illumination load is controlled by feeding back the detection value of

[0019]

(Embodiment 1) A block diagram of a first embodiment according to the present invention is shown in FIG. 1, and a schematic side view is shown in FIG.

In this configuration, two luminaires 3a and 3b connected via a communication signal line are connected to a direct light B (hereinafter, referred to as external light).
Called light B. ), And detects only the reflected light from the lower surface, and transmits the detection output to the lighting fixtures 3a and 3b (hereinafter, referred to as an external light separating illuminance sensor) 4.
It is composed of Here, the lighting fixture 3 has a lighting load 8
And a sensor unit 5 equipped with an illuminance sensor 1 for receiving reflected light from the lower surface and detecting illuminance on the lower surface, and transmits an on / off signal and a dimming signal to an illumination load 8 based on a detection value of the sensor unit 5. The control unit 7 controls the light output of the lighting fixture 8, and the communication unit 6 communicates the detected value of the lighting fixture 3 with another lighting fixture 3. And each lighting fixture 8 transmits / receives the detection value etc. of each other's illuminance sensor 1 via a communication signal line.

Here, the reflected light from the lower surface mainly includes reflected light A (hereinafter, referred to as light A) due to external light and the lighting fixture 8.
(Hereinafter referred to as light C). It is desirable that the external light separating illuminance sensor 4 is mounted closer to the window than all the sensor units 5 and toward the indoor side so that the direct light B of the external light cannot be directly incident.

The illuminance sensor 1 attached to each lighting fixture 8 has a first illuminance sensor (hereinafter, referred to as a window-side illuminance sensor) which is located closest to the window side and is used for daylight use depending on the arrangement of the lighting fixtures 8. 1a) and a third illuminance sensor (hereinafter referred to as an illuminance sensor) 1b used for initial illuminance correction other than the window-side illuminance sensor 1a. The window-side illuminance sensor 1a receives all of the light A, the light B, and the light C as shown in FIG. The external light separating illuminance sensor 4 receives light A and light C and does not receive light B, as shown in FIG. And the window side illuminance sensor 1a
It operates as shown in Table 1 according to the detection value of the illuminance sensor 4 for separating external light.

[0023]

[Table 1]

However, the detection values of the illuminance sensor 1a are X1, X
2, X3 (X1>X2> X3), and the detection values of the illuminance sensor 4 for separating external light are Y1, Y2, and Y3 (Y1>Y2> Y).
3).

In the normal mode, since the detection values of the illuminance sensor 1a and the illuminance sensor 4 for separating external light are substantially equal, it is possible to determine that there is almost no influence of the light B. Therefore, the illuminance sensor 1a and the illuminance sensor for separating external light can be determined. 4 to control the light output of the lighting fixture 8 based on the detected value.

In the first mode, the value X1 detected by the illuminance sensor 1a is larger than the value Y2 detected by the illuminance sensor 4 for separating external light, and the value Y2 detected by the illuminance sensor 4 for separating external light is obtained to some extent. The detection value X1 is light A,
It can be determined that not only C but also the influence of light B is affected.
Therefore, in this case, the light output of the lighting fixture 8 is controlled based on the detection value of the illuminance sensor 4 for separating external light, or the lighting fixture 8 is turned on at a low constant output level in consideration of energy saving, or In order to control the light output of the lighting load 8 based on the detection value of the sensor 1b, or to reduce the darkness that is felt when a person who has outside light is seen from the indoor side, the light output is increased. Control such as lighting the lighting fixture 8 at a constant level is performed.

In the second mode, the value X1 detected by the illuminance sensor 1a is larger than the value Y3 detected by the illuminance sensor 4 for separating external light, and the value Y3 detected by the illuminance sensor 4 for separating external light is used.
Is small, it can be determined that the detection value X1 is almost due to the light A and the light B, and the light C is hardly affected. Therefore, the detection value Y of the illuminance sensor 4 for separating external light is
Alternatively, the light output of the lighting fixture 8 is controlled based on the detection value of the illuminance sensor 1b on the network other than the illuminance sensor 1a.

In the third mode, the value X2 detected by the illuminance sensor 1a is larger than the value Y3 detected by the illuminance sensor 4 for separating external light, and the value Y3 detected by the illuminance sensor 4 for separating external light is used.
Is small, it can be determined that the detected value X2 is almost due to the light A and the light B and the light C is hardly affected, like the detected value X1 in the second mode. Therefore,
Similarly to the second mode, the light output of the lighting fixture 8 is controlled based on the detection value Y of the external light separating illuminance sensor 4 or the detection value of the illuminance sensor 1b on the network other than the illuminance sensor 1a.

As described above, by comparing the detected values X and Y of the illuminance sensor 1a and the illuminance sensor 4 for separating external light, the influence of the light B in the detected value X of the illuminance sensor 1a is reduced. Control based on the reflected light (light A and light C) by the lower surface can be performed. In other words, with a simple configuration, the daylight can be more accurately used by the illuminance sensor without erroneous determination due to the direct light of the external light, and energy can be comfortably realized.

(Embodiment 2) FIG. 3 is a schematic side view of a second embodiment according to the present invention, and FIG.

FIG. 1 is a block diagram showing the configuration of the embodiment.
2 is different from the first embodiment shown in FIG. 2 in that the illuminance sensor 4 for separating external light is installed at a position where all of the lights A, B, and C enter. Since a filter as shown in FIG. 4 is provided on the light receiving surface of the external light separation illuminance sensor 4 and the light output of the lighting fixture 8 is controlled by the detection value of the external light separation illuminance sensor 4.
The description of the same components as those of the other first embodiment will be omitted by retaining the same reference numerals.

As shown in FIG. 4, the filter provided on the illuminance sensor 4 for separating external light has a half of the light-receiving surface blocked and the other half light-transmittable, and the light-blocked portion alternates between the window side and the inside. Are rotated by 180 ° so as to be arranged at the same time. By the rotation of the filter, the detection area of the illuminance sensor 4 for external light separation can be divided into approximately two parts, the window side and the inside, as shown in FIG. 3, and the external light separation illuminance sensor 4 receives light in each of the separated detection areas. By comparing the detection values of the illuminance sensors 4, the light output of the luminaire 8 is controlled by reducing the influence of the direct incident light (light B) from the external light with a simple configuration such that only one illuminance sensor is required. be able to.

The filter may be of any type as long as the filter can reduce the influence of the light B when the light shielding surface faces the window. The illuminance sensor 1 may be used instead of the illuminance sensor 4 for separating external light, or another illuminance sensor may be used.

(Embodiment 3) FIG. 5 is an enlarged view of a main part of a third embodiment according to the present invention.

The difference from the third embodiment shown in FIG. 4 is that the light-shielding plate (or light-shielding film) slides on the light receiving surface of the external light separating illuminance sensor 4 so that the external light separating illuminance sensor 4 The second embodiment is configured to switch between light shielding and light transmission on the light receiving surface. The same components as those in the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

With this configuration, the ratio of light blocking on the light receiving surface of the external light separating illuminance sensor 4 can be arbitrarily changed. The light output of the lighting fixture 8 can be controlled by further reducing the influence of the direct incident light (light B).

If the light-shielding plate (or light-shielding film) is configured so that the light-shielding ratio of the light-receiving surface of the external light separating illuminance sensor 4 can be changed arbitrarily, the transmittance or light-shielding portion or the light-transmitting portion can be changed. Any shape may be used. The illuminance sensor 1 may be used instead of the illuminance sensor 4 for separating external light, or another illuminance sensor may be used.

[0038]

According to the first to third, fifth, and eighth aspects of the present invention, a lighting device capable of controlling the light output of a lighting load by reducing the influence of direct light of external light. I will provide a.

According to the fourth aspect of the present invention, in addition to the effects of the first aspect of the present invention, there is provided a lighting device which does not need to use a plurality of illuminance sensors and can be downsized.

According to the invention of claim 6, in addition to the effect of the invention of claim 1, a lighting device which can save energy is provided.

According to the seventh aspect of the present invention, in addition to the effect of the first aspect, it is possible to reduce a dark feeling that is felt when a person who has outside light is viewed from the indoor side. Provide a possible lighting device.

[Brief description of the drawings]

FIG. 1 shows a block configuration diagram of a first embodiment according to the present invention.

FIG. 2 shows a schematic side view of the first embodiment according to the present invention.

FIG. 3 shows a schematic side view of a second embodiment according to the present invention.

FIG. 4 is an enlarged view of a main part of a second embodiment according to the present invention.

FIG. 5 is an enlarged view of a main part of a third embodiment according to the present invention.

FIG. 6 is a schematic cross-sectional view of a first conventional example according to the present invention.

FIG. 7 is a schematic sectional view of a second conventional example according to the present invention.

FIG. 8 shows a plan view of a third conventional example according to the present invention.

FIG. 9 shows a schematic sectional view of a fourth conventional example according to the present invention.

[Explanation of symbols]

 1, 4 Illuminance sensor 7 Control unit 8 Lighting load

Claims (8)

[Claims] 1. An illumination load for irradiating a certain surface in a closed space, a first illuminance sensor for detecting at least illuminance of the certain surface, and the illumination by feeding back a detection value of the first illuminance sensor. A control unit for controlling a light output of a load, wherein a direct light detection unit that detects light incident on the first illuminance sensor directly from outside the closed space is provided. The lighting device according to claim 1. 2. The apparatus according to claim 1, wherein the direct light detection unit reflects the light A reflected from the outside of the closed space and incident on the first illuminance sensor and the first illuminance directly from outside the closed space. 2. The illumination according to claim 1, wherein the light B incident on the sensor is compared with the light C reflected on the predetermined surface from the illumination load and incident on the first illuminance sensor. 3. apparatus. A first illuminance sensor that detects the light A, the light B, and the light C; and a second illuminance sensor that detects the light A and the light C; The lighting device according to claim 1, wherein the light detection unit compares a detection value of the first illuminance sensor with a detection value of the second illuminance sensor. 4. The lighting device according to claim 1, wherein the direct light detecting means has a light shielding member for switching at least one of a light receiving direction and a light receiving amount of the illuminance sensor. 5. The lighting device according to claim 3, wherein, when the light B is detected, the light output of the lighting load is controlled by feeding back only the detection value of the second illuminance sensor. 6. The lighting device according to claim 1, wherein the light output of the lighting load is controlled to a low level when light incident on the first illuminance sensor directly from outside the closed space is detected. apparatus. 7. The lighting device according to claim 1, wherein the light output of the lighting load is controlled to a high level when light incident on the first illuminance sensor directly from outside the closed space is detected. apparatus. 8. A third illuminance sensor is provided in the closed space, and when light incident on the first illuminance sensor directly from outside the closed space is detected, a detection value of the third illuminance sensor is obtained. The lighting device according to claim 1, wherein the light output of the lighting load is controlled by feedback.