JPH1167465A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system that can maintain a predetermined illuminance and reduce the influence of an object having an abnormal reflectance and external light by memorizing the light output amount of an illuminating load when the detected value of an irradiated surface illuminance generally coincides with a predetermined desired value and by making the illuminating load output this memorized light output amount. SOLUTION: By detecting the presence of a human with a human detection part 6, a lamp 3 is lighted through a control part 2. In addition, by detecting an irradiated surface illuminance within an illuminance control region with a lower face illuminance detection part 1, the output light amount of the lamp 3 is so controlled through the controlling part 2 that the detected value approaches a predetermined value. When the detected value coincides generally with a reference value as a result of the control, the output light amount of the lamp 3 is memorized in a memory part 4. Thereafter, the control based on the detected value of the illuminance detection part 1 is terminated if required and the lamp 3 is made to output the memorized constant light output amount. When the lamp 3 is lighted from a light-out state by means of a human detection signal, a timer signal, an external power source signal or the like, the lamp 3 is made to output the light output amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly, to a lighting device for controlling a plurality of lighting fixtures, which uses a bottom surface illuminance detecting section for the purpose of energy saving and improvement of comfort. And a lighting device for dimming a surface to be illuminated such as an office to a predetermined value.

[0002]

2. Description of the Related Art Heretofore, in an illuminating device for dimming an illuminated surface of an office or the like to a predetermined value by using a lower surface illuminance detector having a photodiode as a light receiving element, the illumination device is mounted downward with respect to a ceiling surface. The lower surface illuminance detection unit that detects the illuminance of the illuminated surface calculates and estimates the illuminance of the illuminated surface based on the detection value of the reflected light from the illuminated surface.

However, the reflected light from the surface to be illuminated changes according to the reflectance of the surface to be illuminated or a sudden change in daylight incident from the outside. Daylight coming from the outside will be detected, so despite the fact that the illuminance on the irradiated surface has not changed,
The first problem is that the output of the lighting load may flicker.

[0004] As means for solving the first problem,
FIG. 15 is a block diagram showing the structure of the shovel disclosed in Japanese Patent Application Laid-Open No. 8-195284.

This block configuration includes a lower surface illuminance detector (hereinafter, referred to as an illuminance detector) 1, an illumination load (hereinafter, referred to as a lamp) 3, a memory unit 4, a timer unit 5, an illuminance detector. The control unit 2 calculates the illuminance of the surface to be irradiated and controls the lamp 3 based on the detection value of the unit 1, the data stored in the memory unit 4, and the timer output of the timer unit 5. Then, the illuminance detector 1 samples and detects the illuminance of the surface to be irradiated during a certain period T (s) a plurality of times and integrates the lamp 3 by the controller 2 based on the sampled data values. The dimming control is performed, and the control unit 2 calculates the dimming control based on the remaining data values excluding the maximum value and the minimum value from the sampling data, and controls the dimming of the lamp 3. With such a configuration, it is possible to reduce the flicker of the output of the lamp with respect to a rapid change in the illuminance of the irradiation surface.

The illuminance detector 1 has a light receiving element.
The light receiving element may be a photodiode or cds. Further, the number of lamps 3 connected to the control unit is not particularly limited.

[0007]

However, in the above conventional example, the following second problem occurs. Hereinafter, a brief description will be given with reference to FIG.

In the above conventional example, the illuminance of the irradiated surface hardly changes in an area where the influence of external light is small (for example, an area except the vicinity of the window side) unless the illuminance changes abruptly. However, at time Tn, when an object having a higher reflectance than the surroundings enters the detection area of the illuminance detector 1, if the change in the illuminance of the illuminated surface due to the reflectance is gradual, the actual Although the illuminance on the irradiation surface has not changed, FIG.
As shown in FIG. 1A, the detection value of the illuminance detector 1 increases, and FIG.
As shown in FIG. 6B, the value obtained by integrating the sampling data (hereinafter referred to as a representative value of the sampling data) also increases, and the control unit 2 determines that the illuminance of the irradiated surface has increased, and As shown in FIG. 16 (c), the lamp 3 is dimmed, and for example, the illuminance of the actual irradiated surface changes at time Tn and time Tk.

[0009] In the case of an indoor space such as an office, the reflectance changes every moment as a person or a document moves.
In this conventional example, since the lamp is dimmed based on the representative value of the sampling data, when the illuminance of the illuminated surface changes rapidly due to the influence of the reflectance, the output of the lamp is eliminated by eliminating the influence of the reflectance. Flicker can be reduced,
If the change in illuminance on the irradiated surface is gradual, as described above,
It is determined that the illuminance of the irradiated surface has changed, and the lamp 3 is dimmed. A similar problem occurs when outside light such as daylight enters the detection area instead of the change in reflectance.

The present invention has been made in view of all of the above problems, and has as its object to maintain the predetermined illuminance while preventing the influence of external light such as those having different reflectances or daylight. An object of the present invention is to provide a lighting device that can be reduced and that can achieve energy saving and improved comfort.

[0011]

According to the first aspect of the present invention, there is provided an illuminance detecting section for detecting an illuminance on a surface to be illuminated in an illumination control area, and a detecting section for detecting an illuminance. A control unit that controls the light output amount of the lighting load in a direction in which the value approaches a predetermined target value; and a memory unit that stores the light output amount of the lighting load when the detected value substantially matches the target value. The load outputs a light output amount stored in the memory unit when the detected value substantially matches the target value.

According to a second aspect of the present invention, when the detected value substantially coincides with the target value, the illumination load stops outputting the light output amount based on the detected value.

According to a third aspect of the present invention, the illumination load outputs the light output amount stored in the memory unit when an external signal is input.

According to a fourth aspect of the present invention, when there is an external signal input, the illumination load outputs a light output amount based on the detected value.

According to a fifth aspect of the present invention, the external signal is a human body detection signal that detects the presence of a human body.

According to the sixth aspect of the present invention, the external signal is a timer signal.

According to a seventh aspect of the present invention, the external signal is at least one of ON and OFF of an external power supply.

According to an eighth aspect of the present invention, the external signal is a signal output after a lapse of a predetermined time from the end of detection of the presence of a human body.

According to a ninth aspect of the present invention, the external signal is a timer signal and a human body detection signal that detects the presence of a human body.

According to a tenth aspect of the present invention, the external signal is a timer signal and a signal output after a lapse of a predetermined time from the end of detecting the presence of a human body.

According to the eleventh aspect of the present invention, the external signal is a signal output when the ambient temperature becomes higher than a predetermined value.

According to a twelfth aspect of the present invention, the external signal is a signal output when the amount of incident light from outside the illumination control area becomes larger than a predetermined value.

[0023]

Embodiment

(Embodiment 1) FIG. 1 is a block diagram of a first embodiment according to the present invention, and FIG. 2 is an operation waveform diagram thereof.

The difference from the conventional example shown in FIG. 15 is that a human detection section 6 for transmitting a signal to the control section 2 when the presence or absence of a person is detected is provided. Are denoted by the same reference numerals and description thereof will be omitted.

The illuminance detecting unit 1 is mounted on a ceiling surface of an indoor space such as an office so that the light receiving surface of the light receiving element is located downward.
In other words, the illuminance of the illuminated surface is detected by detecting the intensity of the reflected light from the illuminated surface such as a desk, a shelf, or a floor, which is mounted so as to face the illuminated surface. It is. Therefore, for example, by focusing the reflected light on the light receiving surface of the light receiving element using optical means, it is also possible to detect only the intensity of light incident from a specific range.

The control unit 2 is constituted by, for example, a microcomputer, and has a memory unit 4 and a human detection unit 6 connected thereto. Then, based on the illuminance data stored in the memory unit 4 and the detection signal of the human detection unit 6,
A dimming signal for performing dimming control for increasing or decreasing the light output of the lamp 3 is output to each lamp 3 so that the illuminance of the irradiated surface becomes a predetermined illuminance.

The memory unit 4 stores illuminance data obtained by arithmetically processing the detection output of the illuminance detection unit 1 in the control unit 2, and the stored illuminance data is transmitted from the memory unit 4 by the control unit 2 as needed. Can be read. The control unit 2 transmits a dimming signal to the lamp 3 after the arithmetic processing, but the dimming signal at that time is also stored in the memory unit 4, and the stored dimming signal can be read out at any time. . Further, the time when the dimming signal is sent, the room temperature data at that time, and the like can be stored.

Hereinafter, the operation will be briefly described with reference to FIG. From the state where the person does not exist in the illumination control area for a certain period of time t1 and the lamp 3 is extinguished, at the moment when the presence of the person in the illumination control area is detected and the lamp 3 is turned on, for example, in the office, From the state where no one has come to the office, the moment the human detection unit 6 responds to the presence of the human body and the lamp 3 is turned on, the sampling control function is turned on as shown in FIG. At this time, the illuminance detection unit 1 transmits the detection value of the reflected light from the lower surface to the control unit 2, and the control unit 2 compares the detection value of the illuminance detection unit 1 with the target value. Illuminance detector 1
If the detected value is lower than the target value, the lamp 3 is made brighter as shown in FIG. 2C. If the detected value by the illuminance detector 1 is higher than the target illuminance value, as shown in FIG. By darkening the lamp 3, the output of the lamp 3 is controlled such that the illuminance value of the irradiated surface becomes the target value. Then, when the illuminance value of the illuminated surface reaches the target value, the transmission output data from the control unit 2 to the lamp 3 is stored, the detection function of the illuminance detection unit 1 is stopped, and the lamp is stored based on the stored data. 3 is kept on.

By stopping the detection function of the illuminance detector 1, the change in the reflectance of the lower surface is no longer detected, so that the output of the lamp 3 hardly affected by the reflectance of the lower surface is obtained while the target illuminance value is secured. be able to. Further, since the illuminance of the illuminated surface is detected and the target value is corrected each time the lamp shifts from the unlit state to the lit state, energy can be saved by the correction amount.

Here, it is desirable that the target value of the illuminance of the illuminated surface is the illuminance of the illuminated surface at the moment when the lamp 3 is switched from the unlit state to the lit state, that is, the initial value of the illuminance of the illuminated surface. Because, for example, assuming an indoor space such as an office or the like, the situation where the lamp 3 is turned off may be a situation where there is no person before going to work or during lunch, and in a situation where there is no such person, This is because it is considered that the reflectance of the lower surface hardly changes.

In this embodiment, the present invention may be applied to the case where the lamp is changed from the unlit state to the lit state when the power is turned on. Further, the sampling is stopped when the illuminance of the irradiated surface reaches the target value. It may be instant or after a certain period of time has elapsed after the illuminance of the irradiated surface has reached the target value.

(Embodiment 2) FIG. 3 shows an operation waveform diagram of a second embodiment according to the present invention.

The block configuration of the present embodiment is the same as that of the first embodiment shown in FIG. 1 and only the operation is different, so that the description of the block configuration diagram is omitted.

Hereinafter, the operation will be briefly described with reference to FIG. In this embodiment, for a certain period before the lamp shifts from the lighting state to the light-out state after the lighting holding time elapses, for example, the lamp after the lighting holding time elapses after the last person leaves the office in an office or the like disappears. In the period before this, the function of the sampling control is turned on. During the sampling control period, the illuminance detection unit 1 transmits a detection value of light reflected from the lower surface to the control unit 2, and the control unit 2 compares the detection value of the illuminance detection unit 1 with a target value. If the value detected by the illuminance detector 1 is lower than the target value, the lamp 3 is turned on as shown in FIG.
If the value detected by the illuminance detector 1 is higher than the target value, the lamp 3 is darkened as shown in FIG. 3C so that the illuminance value of the illuminated surface becomes the target value.
Control the output of Then, when the illuminance value of the illuminated surface reaches the target value, the transmission output from the control unit 2 to the lamp 3 is stored, the detection function of the illuminance detection unit 1 is stopped, and the lamp 3 is turned off. When lighting the lamp 3 next time, the lighting of the lamp 3 is maintained based on the stored data.

(Embodiment 3) FIG. 4 is a block diagram showing a third embodiment according to the present invention, and FIGS. 5 and 6 show operation waveform diagrams thereof.

The difference from the first embodiment shown in FIG. 1 resides in that a timer unit 5 is provided. Omitted. Here, the timer unit 5 gives a trigger to the control unit 2 so as to turn on the sampling control function at a certain time or at a certain interval (for example, once / one H).

The operation will be briefly described below with reference to FIGS. FIG. 5 shows a case where the lamp 3 is turned on when the trigger of the timer unit 5 is activated. In the sampling control period, the illuminance detection unit 1 transmits a detection value of light reflected from the lower surface to the control unit 2, and the control unit 2 compares the detection value of the illuminance detection unit 1 with a target value. If the value detected by the illuminance detector 1 is lower than the target value, the lamp 3 is made brighter as shown in FIG. 5C, and if the value detected by the illuminance detector 1 is higher than the target value, FIG. The output of the lamp 3 is controlled so that the illuminance value of the irradiated surface becomes the target value by darkening the lamp 3 as shown in FIG. Then, when the illuminance value of the illuminated surface reaches the target value,
, The detection function of the illuminance detector 1 is stopped, and the lamp 3 is turned off. At the next time set by the timer unit 5, the lamp 3 is kept on based on the stored data.

FIG. 6 shows a case where the lamp 3 is turned off until the timer unit 5 is triggered. in this case,
The lamp 3 is turned on by a trigger of the timer unit 5. The subsequent operation is the same as that shown in FIG.

With this configuration, when the predetermined illuminance is no longer obtained due to deterioration of the lamp or the like, the timer is periodically re-corrected so that the illuminance of the irradiated surface becomes the predetermined illuminance. it can.

(Embodiment 4) FIG. 7 shows a block diagram of a fourth embodiment according to the present invention, and FIGS. 8 to 10 show its operation waveform diagrams.

The difference from the first and second embodiments shown in FIG. 1 lies in that a timer unit 5 is provided, and the same components as those in the other first and second embodiments have the same reference numerals. The description is omitted by appending a symbol.

The operation will be briefly described below with reference to FIGS. As shown in FIG. 8, when the transition from the light-off state in which the presence of a person is not detected to the light-up state in which the presence of a human body is detected is within the time set by the timer unit 5, the sampling control function is turned on and the irradiation is performed. The transmission output data from the control unit 2 to the lamp 3 when the surface illuminance value reaches the target value is stored, the detection function of the illuminance detection unit 1 is stopped, and the lamp 3 is kept on based on the stored data. .

As shown in FIG. 9, when the period before the transition from the lighting state in which the presence of a human body is detected to the unlit state in which no human presence is detected is within the time set by the timer unit 5, the sampling control of the sampling control is performed. When the function is turned on, the transmission output data from the control unit 2 to the lamp 3 when the illuminance value of the irradiated surface reaches the target value is stored.
The lamp 3 is kept on based on the stored data. As shown in FIG. 10, even if a human body is detected outside the time set by the timer section 5, the sampling control function is not turned on.

With the above configuration, it is possible to prevent the correction of the target illuminance value by frequently turning on the sampling control function in an indoor space where the lamp is frequently turned on and off, such as a room with a high rate of leaving the seat. Become.

(Embodiment 5) FIG. 11 is a block diagram of a fifth embodiment according to the present invention, and FIG. 12 is an operation waveform diagram thereof.

The difference from the first and second embodiments shown in FIG. 1 is that a temperature detector 8 for always detecting the ambient temperature of the lamp is provided, and other first and second embodiments are provided. The same reference numerals are given to the same components as those of the embodiment, and the description is omitted. Depending on the ambient temperature, the lamp cannot obtain the same amount of light even if the same dimming level is transmitted from the control unit. For example, the brightness differs between when the lamp is first turned on in the winter morning and when the room temperature is raised by an air conditioner or the like.

Next, the operation will be briefly described with reference to FIG. When the correction based on the ambient temperature is not performed, FIG.
As shown in (a) to (c), once the dimming output of the lamp 3 is stored in the illuminance detection unit 1, the dimming is continued at that value.

When performing correction based on the ambient temperature, during the sampling control period, the illuminance detection unit 1 transmits the detected value of the reflected light from the lower surface to the control unit 2, and the control unit 2 detects the value detected by the illuminance detection unit 1. Is compared with the target value, and the output of the lamp 3 is controlled so that the illuminance value of the irradiated surface becomes the target value. Then, when the illuminance value of the irradiated surface reaches the target value, the control unit 2
From the transmitter 3 to the lamp 3, the ambient temperature at that time is also stored, the detection function of the illuminance detector 1 is stopped,
The lamp 3 is turned off. The temperature detecting section 8 detects the ambient temperature of the lamp as needed, and when the temperature is increased or decreased by a certain value A or more from the stored temperature value, the sampling control function is turned on again and the above operation is repeated.

With the above configuration, it is possible to correct a change in the light amount of the lamp due to a temperature change.

(Embodiment 6) FIG. 13 is a block diagram of a sixth embodiment according to the present invention, and FIG. 14 is an operation waveform diagram thereof.

The difference from the first and second embodiments shown in FIG. 1 is that an external light detector 9 for always detecting the amount of external light is provided, and other first and second embodiments are provided. The same components as those of the embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation will be briefly described with reference to FIG. When the value indicated by the external light detection unit 9 is equal to or less than a certain value P,
The operation is performed as described in Embodiment Modes 1 to 5. When the value indicated by the external light detection unit 9 is equal to or more than a certain value P,
Shift from the stored dimming lighting operation mode to a mode that can use daylight, turn on the sampling control function,
The illuminance on the lower surface is controlled to be constant at a predetermined value. When the value indicated by the external light detection unit 9 returns to a certain value P or less, the sampling control function for the illuminance detection unit 1 near the window side, which is susceptible to external light, is turned off, and the originally stored light control The mode shifts to the lighting operation mode. Alternatively, the external light detection unit 9
Returns to a value P or less, the sampling control function is turned on again, the illuminance on the lower surface is controlled to be constant at a predetermined value, and the lamp 3 is turned on.

With the above configuration, it is possible to save energy by using external light such as daylight.

[0054]

According to the first to fifth, seventh, and eighth aspects of the present invention, while maintaining a predetermined illuminance, the influence of external light such as one having a different reflectance or daylight is maintained. It is possible to provide a lighting device that can be reduced and that can realize energy saving and improved comfort.

According to the sixth aspect of the present invention, in addition to the effects of the first to fifth aspects of the present invention, when the predetermined illuminance cannot be obtained due to deterioration of the lamp or the like,
It is possible to provide an illuminating device that can be periodically re-corrected by a timer so that the illuminance of the irradiated surface becomes a predetermined illuminance.

According to the ninth and tenth aspects of the present invention, in addition to the effects of the third and fourth aspects of the present invention, a room where the lamp is frequently turned on and off, such as a room with a high unattended rate, is provided. It is possible to provide a lighting device capable of preventing correction of a target illuminance value due to frequent sampling control functions in a space.

According to the eleventh aspect, according to the third aspect,
In addition to the effects of the present invention, it is possible to provide a lighting device capable of correcting a change in the light amount of the lamp due to a temperature change.

According to the twelfth aspect, the third aspect is provided.
In addition to the effects of the invention described in claim 11, it is possible to provide a lighting device capable of saving energy by using external light such as daylight.

[Brief description of the drawings]

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

FIG. 2 shows an operation waveform diagram according to the embodiment.

FIG. 3 shows an operation waveform diagram of a second embodiment according to the present invention.

FIG. 4 shows a block diagram of a third embodiment according to the present invention.

FIG. 5 shows a first operation waveform chart according to the embodiment.

FIG. 6 shows a second operation waveform chart according to the embodiment.

FIG. 7 shows a block diagram of a fourth embodiment according to the present invention.

FIG. 8 shows a first operation waveform chart according to the embodiment.

FIG. 9 shows a second operation waveform chart according to the embodiment.

FIG. 10 shows a third operation waveform chart according to the embodiment.

FIG. 11 shows a block diagram of a fifth embodiment according to the present invention.

FIG. 12 shows an operation waveform diagram according to the embodiment.

FIG. 13 shows a block diagram of a sixth embodiment according to the present invention.

FIG. 14 shows an operation waveform diagram according to the above embodiment.

FIG. 15 shows a block diagram of a conventional example according to the present invention.

FIG. 16 shows an operation waveform diagram according to the conventional example.

[Explanation of symbols]

 1 illuminance detection unit 2 control unit 3 lamp 4 memory unit

Claims (12)

[Claims] An illuminance detection unit configured to detect illuminance of an illuminated surface in an illumination control area; and a control unit configured to control a light output amount of an illumination load in a direction in which a detection value of the illuminance detection unit approaches a predetermined target value. A memory unit that stores a light output amount of the lighting load when the detection value substantially matches the target value, wherein the lighting load is such that the detection value substantially matches the target value. A lighting device for outputting a light output amount stored in a memory unit. 2. The lighting device according to claim 1, wherein the lighting load stops outputting a light output amount based on the detected value when the detected value substantially matches the target value. 3. The lighting device according to claim 1, wherein the lighting load outputs a light output amount stored in the memory unit when an external signal is input. 4. The lighting device according to claim 1, wherein the lighting load outputs a light output amount based on the detected value when an external signal is input. 5. The discharge lamp lighting device according to claim 3, wherein the external signal is a human body detection signal that detects the presence of a human body. 6. The discharge lamp lighting device according to claim 3, wherein the external signal is a timer signal. 7. The discharge lamp lighting device according to claim 3, wherein the external signal is at least one of on and off of an external power supply. 8. The discharge lamp lighting device according to claim 3, wherein the external signal is a signal output after a lapse of a predetermined time from the end of detection of the presence of a human body. 9. The discharge lamp lighting device according to claim 3, wherein the external signal is a timer signal and a human body detection signal that detects the presence of a human body. 10. The external signal is a timer signal, and
The discharge lamp lighting device according to claim 3, wherein the signal is a signal output after a lapse of a predetermined time from the end of detection of the presence of a human body. 11. The discharge lamp lighting device according to claim 3, wherein the external signal is a signal output when an ambient temperature becomes higher than a predetermined value. 12. The apparatus according to claim 3, wherein the external signal is a signal output when the amount of incident light from outside the illumination control area becomes larger than a predetermined value. Discharge lamp lighting device.