JPH04253185A - Illumination device - Google Patents

Abstract

PURPOSE:To prevent a load from being turned off by the erroneous action of a brightness identification section receiving the light when the load is lighted. CONSTITUTION:The output of a NAND gate 8 is connected to the input terminal of a NAND gate 4 via a diode 11 to disable the signal of a CdS1 when a load is lighted. When the output signal of the NAND gate 8 is the H-level, transistors 9, 10 are turned on respectively, and a load 13 is lighted. The output of the NAND gate 8 is inputted to the input terminal of the NAND gate 4 via the diode 11. When the output of the NAND gate 8 is the H-level, i.e., while the load 13 is lighted, the H-level signal is invariably fed to the input terminal on the signal side of the CdS1 of the NAND gate 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 such as an automatic flasher that automatically switches the power supply to a lighting load depending on the surrounding brightness and darkness and whether or not a human body is detected.

0002

[Prior Art] Automatic blinking device based on human body detection Conventionally, lighting devices equipped with a human body detection sensor turn on the lighting load for a preset period of time only when a human body is detected by the human body detection sensor. This is known as a convenient lighting device that automatically supplies lighting when needed and also has a crime prevention effect.

[0003] Automatic flashing device with bright/dark discrimination Conventionally, in this type of automatic flashing device, the load lights up and the light activates the illuminance sensor, in order to avoid unstable operation in which the load repeatedly turns on and off. In addition, a method has been adopted in which hysteresis is added to the light/dark discrimination of an illuminance sensor, etc., and a difference is created between the discrimination value for changing from bright to dark when the illuminance decreases and the discrimination value for changing from dark to bright when the illuminance increases.

FIGS. 6 and 7 are, for example, published in Japanese Patent Application Laid-open No. 61-613.
This is a circuit configuration of a conventional automatic flasher described in Japanese Patent No. 99, and a circuit configuration using a solar cell for brightness/darkness discrimination. Figure 6
uses CdS for the light receiving device, and CdS increases as the illuminance increases.
By changing the resistance value of dS, the transistor Tr2
1. Switch on/off of Tr22, transistor T
When r21 is on, that is, when the ambient illuminance of the CdS light receiving section is below the lighting illuminance and when CdS has a high resistance, the transistor Tr
23 is turned off, the thyristor Th21 is turned on, and therefore the triac T21 is turned on and the load is turned on.

When the transistor TR22 is on, that is, C
When the ambient illuminance of the dS light receiving section is higher than the extinguishing illuminance and CdS has a low resistance, the transistor TR23 is turned on, so the thyristor Th21 is turned off, and therefore the triac T21 is turned off, and the load is turned off. It is. In FIG. 7, two solar cells are used to distinguish between bright and dark, and the output signal of the first solar cell SB1 turns on the switching element PUT1, and the output signal of the second solar cell SB2 turns on the switching element PUT1. It is provided with circuit means for bringing the switching element PUT1 into a non-conductive state.

[0006]

[Problems to be Solved by the Invention] In the automatic flasher that has the above-mentioned human body detection and light/dark discrimination functions,
Only when the surrounding illuminance is below the brightness discrimination value and a human body is detected, the load will blink for a certain period of time. This causes a problem in that even if a human body is detected during load lighting, the lighting signal at that time cannot be sent.

[0007] In order to solve this problem, hysteresis is provided in the bright/dark discrimination as described in (2) above, but this increases the complexity of the circuit and increases the cost. Furthermore, the amount of increase in illuminance caused by the light when the load is turned on depends on the usage conditions and cannot be generalized, so in order to prevent malfunctions, the difference in hysteresis must be made larger. . Furthermore, since the value differs depending on the size of the load, it is necessary to determine the value for each separately.

[0008]Furthermore, between the discrimination value from bright to dark when the illuminance decreases and the discrimination value from dark to bright when the illuminance increases, the latter inevitably takes a higher value, and this is due to the fact that the latter naturally takes a higher value. It contradicts my senses. As described above, providing hysteresis to bright/dark discrimination has various problems. The present invention has been provided in view of the above-mentioned points, and is aimed at preventing the light/dark discrimination unit from malfunctioning due to the light received by the light of its own load, causing the load to turn off. It is.

[0009]

SUMMARY OF THE INVENTION The present invention includes malfunction prevention means that has a function that is not affected by the output of the bright/dark discriminator at least during lighting.

0010

[Function] The malfunction prevention means prevents the light from being affected by the output of the bright/dark discriminator at least while the light is on, and when its own load is lit, the bright/dark discriminator receives the light and malfunctions, causing the load to This is to prevent the lights from turning off.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is an automatic flasher that turns on and off a load depending on the surrounding brightness and presence or absence of human body detection, and when the load is on, the output signal of the illuminance sensor (bright/dark discriminator) is invalidated by receiving the signal. This is to prevent malfunctions.

FIG. 1 shows a first embodiment. If the illuminance around CdS1, which is the illumination sensor, is higher than the brightness discrimination value,
Since dS1 has a low resistance and the potential of A decreases, the output of comparator 2 becomes H level. Therefore Nand Gate 3
The output of the NAND gate 4 becomes an L level, and the output of the NAND gate 4 becomes an H level regardless of the output signal of the human body detection sensor 12. The multivibrator 5 receives a falling signal from the B input terminal and connects the resistor 6 from the QB output (inverted output of Q).
Since the L level signal is output for a certain period determined by the capacitor 7, the signal from the QB output is H level in this case.

Therefore, since the inputs of the NAND gate 8 are each at H level, the output thereof is at L level. Therefore, transistor 9 is turned off, so the potential of B rises, and transistor 10 is turned off. When the transistor 10 is on, the load 13 is turned on by receiving a signal from its collector, and is off in this case. On the other hand, if the illuminance around CdS1 is less than the brightness discrimination value, CdS1
Since dS1 has a high resistance, the potential of A increases and the output of comparator 2 becomes L level. Therefore Nand Gate 3
The output becomes H level.

[0014] Here, when the human body detection sensor 12 detects a human body, an H level signal is outputted, so the inputs of the NAND gates 4 each become H level, and their outputs become L level. That is, only when the illuminance around the CdS 1 is below the brightness discrimination value and the human body detection sensor 1 detects a human body, the output of the NAND gate 4 becomes L level. In response to the fall of the output of the NAND gate 4, the multivibrator 5 outputs an L level signal from the QB output for a certain period of time.

Therefore, the NAND gate 8 outputs an H level signal while the NAND gate 4 is outputting an L level signal and while the multivibrator 5 is outputting an L level signal. Therefore, transistor 9 turns on and the potential of B decreases, so transistor 1
0 is turned on, and load 1 receives the signal from its collector.
3 lights up.

[0016] Here, as the load 13 lights up, C
It is possible that the illuminance around the dS1 is higher than the bright/dark discrimination value, and if this causes the output of the NAND gate 3 to go to L level, even if a human body is detected, the output of the NAND gate 4 will not go to L level and will send a lighting signal. I can't. To solve this problem, in this embodiment, the output of the NAND gate 8 is connected via the diode 11 to the input terminal of the NAND gate 4 on the signal side from the CdS1.
A method is adopted in which the dS1 signal is disabled.

First, when the output signal of the NAND gate 8 is at H level, the transistors 9 and 10 are turned on, and the load 13 is turned on. Therefore, Nand Gate 8
Cd of NAND gate 4 via diode 11
By connecting to the signal side input terminal of S1, when the output of NAND gate 8 is at H level, that is, while the load 13 is lit, the signal side input terminal of CdS1 of NAND gate 4 is always at H level. A signal will be received.

Therefore, even if CdS1 reacts to its own lighting light and the output signal of NAND gate 3 becomes L level, the input terminal on the signal side of CdS1 of NAND gate 4 is kept at H level. A signal is output from the NAND gate 4 in response to a signal from the human body detection sensor 12, and the load 13 can be turned on. Note that the diode 11 constitutes malfunction prevention means.

FIG. 2 shows a second embodiment. In this second embodiment, the bright/dark discrimination is performed by the solar cell 14 instead of the CdS1 as in the first embodiment. If the surrounding illuminance is equal to or higher than the light/dark discrimination value, the potential at point C increases due to the electromotive force of the solar cell 14, so that the transistor 15 is turned on. Therefore, since the potential at point D decreases, an L level signal is input to the NAND gate 4. After that, the principle is the same as in the first embodiment.

On the other hand, if the ambient illuminance is below the brightness discrimination value, the output voltage of the solar cell 14 is low, so the potential at point C decreases and the transistor 15 is turned off. Therefore, the potential at point D increases and an H level signal is input to NAND gate 4. After that, the principle is the same as in the first embodiment. When the solar cell 14 receives light due to the lighting of the load 13 and the output voltage increases, the input terminal on the bright/dark discrimination side of the NAND gate 4 becomes L level, so during that time, even if a human body is detected, the lighting signal will not be sent. I can't send it.

Therefore, as in the first embodiment, by constantly applying an H level signal to the collector of the transistor 15 while the load 13 is lit, a lighting signal is output even though a human body is detected while the load 13 is lit. Prevent the inaction of not doing something. In addition to the above method, it is also conceivable to fix the bright/dark discrimination output signal to the mode immediately before lighting when the load is lit. Further, the influence on the bright/dark discriminator is not limited to only the lighting of the load, but also the influence of light from a light emitting element such as a display monitor that displays whether or not a human body is detected.

[0022] In general, this type of automatic flasher has a bright/dark discriminator and a human body detector independently, receives each signal at one place, determines whether the load is on or off, and outputs a signal accordingly. The idea is to do so. When the human body is detected, the display monitor lights up, and the light activates the bright/dark discriminator. When determining whether to turn on/off the load, the bright/dark discriminator's signal when the human body detection signal is received is used. Since the light becomes bright, the signal to turn on the load will not be output.

Therefore, when a detection signal is output from the human body detector, by fixing the output signal of the bright/dark discriminator to the mode immediately before that for a certain period of time, the output signal of the bright/dark discriminator can be fixed for a certain period of time, so that it is not affected by the light incident on the bright/dark discriminator during that time. It is possible to distinguish between bright and dark depending on the state immediately before that. After that, if it is determined that the surrounding area is bright due to the combination of Example 1, etc., the load will not turn on, and the output of the bright/dark discriminator will be fixed for a certain period of time after the detection of a human body, and then will be released and return to normal operation. Return.

On the other hand, if the surroundings are determined to be dark, the output of the bright/dark discriminator is fixed to that mode for a certain period of time after the detection of a human body, and during that time, it is not affected by the light emitted from the display monitor for human body detection. First, after the load is turned on, even if the fixation of the output of the brightness/darkness discriminator is released, the output signal of the brightness/darkness discriminator is not accepted while the load is lit, so that malfunctions will not occur due to the function of the first embodiment.

A block diagram of this is shown in FIG. block a
is a bright/dark discriminator, and its output signal is input to block d via block c. block d is block a
(Block c) outputs a light/dark discrimination signal such as "dark", and only when the human body detector of block b outputs a human body detection signal, a lighting signal is output.

Here, in block c, when there is no input from the B terminal, that is, when human body detection is not performed, the C output terminal outputs the signal received at the A input terminal as it is, but the human body is not detected from the B terminal. When a detection signal is input, the output from the C output terminal is fixed to the previous output for a certain period of time. Further, block e represents the function of the first embodiment of outputting a dark signal regardless of the signal on the brightness/dark discrimination side during load lighting.

Furthermore, based on the same concept, in addition to fixing the output of the brightness/darkness discriminator for a certain period of time, a method of constantly delaying the output signal of the brightness/darkness discriminator may also be considered. Therefore, if the signal of the bright/dark discriminator is always delayed, the signal of the bright/dark discriminator will be from a certain period of time ago when deciding whether to turn on/off the load, so the load can be turned on or off depending on the brightness of the surroundings a certain period of time ago. can be done. After the load is turned on, the function of the first embodiment prevents malfunction.

FIGS. 4 and 5 show the basic concept of this idea and time charts of the respective output signals. When the ambient illuminance is above a certain value, the load will not turn on because the bright/dark discriminator 31 is irradiated with light above the certain value, regardless of whether the load and the display monitor are lit or not. On the other hand, when the surrounding illuminance is below a certain value, the brightness discriminator 31
is emitting a dark signal from 0 to t1 in FIG. 5(c), but at t1, when the human body detector 32 detects a human body as shown in FIG. 5(a), the display monitor also shows the dark signal. 5(b)
In response to the light, the bright/dark discriminator 31 similarly outputs a bright signal at time t1 as shown in FIG. 5(c).

If the current signal is used to determine whether the load is turned on or off, at time t1 when the human body is detected, a bright signal is output from the bright/dark discriminator 31, so it is determined that the load should not be turned on. do. Therefore, in the delay device 33,
), the bright signal at time t1 becomes t
It is delayed by α and output at time t1 +tα. Therefore, in determining whether to turn on/off a load, when a human body detection signal is input at time t1, a delayed signal at time t1, that is, a signal based on light/dark discrimination between actual times t1 and tα is input. In this case, since it is a dark signal, a decision is made to turn on the load.

As shown in FIG. 5(e), the load is lit for a predetermined time T set by a timer or the like, and while it is lit,
The function of the first embodiment prevents malfunctions by outputting a lighting signal based only on the signal from the human body detection side without being affected by the signal from the bright/dark discrimination side. Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, in the above embodiments, CdS and solar cells are used for bright/dark discrimination, but photodiodes or the like may be used as long as they emit light.

[0031]

Effects of the Invention As described above, the present invention is equipped with a malfunction prevention means that has a function that is not affected by the output of the bright/dark discriminator at least during lighting. It is possible to prevent the light/dark identification section from malfunctioning due to the light received by the light when its own load lights up without being influenced by the output of the identification section, and to prevent the load from turning off. While the display monitor is on, the signal from the bright/dark discriminator does not directly affect the decision to turn on or off the load, so when the load and display monitor are turned on, the ambient illuminance increases and the light/dark discriminator Even if it is determined that the illuminance is higher than the illuminance required to turn off the light, if a human body is detected regardless of this, it is possible to output a lighting signal.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a circuit diagram of a second embodiment.

FIG. 3 is a circuit diagram of Example 3.

FIG. 4 is a circuit diagram of Example 4.

FIG. 5 is an operation waveform diagram.

FIG. 6 is a circuit diagram of a conventional example.

FIG. 7 is a circuit diagram of another conventional example.

[Explanation of symbols]

12 Human body detection sensor

Claims (1)

[Claims] Claim 1: A light/dark discrimination unit that detects ambient brightness and a human body detection sensor that detects the presence or absence of a human body, and when the brightness is below a predetermined level and a human body is detected, the lighting load is turned on. In a lighting device that has an automatic blinking function,
1. A lighting device comprising a malfunction prevention means having a function that is not affected by the output of a bright/dark discriminator at least during lighting.