JPH0235816A - Light indicator and illumination system using same - Google Patents

Abstract

PURPOSE:To unify a light sensor and a light emitting element and to compact them by removing an influence due to the detecting output when the light from a light emitting element when a circumference is dark is detected. CONSTITUTION:When the circumference is dark, the light detecting level of a light sensor 6 is gradually reduced, and at the time of the prescribed level or below, the output of a comparator 20 becomes a high level. When a capacitor 23 is charged and a charging level arrives at the first level of a comparator 24, the output of the capacitor 24 is inverted to a high level and a transistor 14 is turned on. Thus, a lamp 7 lights up. A part of the light from the lamp 7 is also made incident on the light sensor 6, the light detecting level rises, and at the time of arriving at the prescribed level, the output of the capacitor 20 is inverted into a low level. Thus, the charge of the capacitor 23 is discharged through a discharging resistance 25, and when the charging level is reduced up to the second level of the comparator 24, the output of the capacitor 24 is inverted, the transistor 14 is turned off and the lamp 7 puts out. Thus, the charging and discharging of the capacitor 23 are repeated, the lamp 7 flickers at the prescribed period and the darkness of the circumference is informed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a light indicator that detects and notifies that the surroundings have become dark, and a lighting system using the light indicator.

(Prior art) Conventionally, this type of light indicator uses a light sensor to detect outside light, and when the surroundings become dark and the detection level of outside light decreases, a light indicator separate from the light sensor is used to detect the outside light. This notification was provided by lighting a lamp installed in a position where it would not be affected by light.

(Problem to be solved by the invention) However, if the lamp is installed in a position where the light does not affect the optical sensor in this way, the optical sensor and the lamp must be installed at a considerable distance, which is relatively There was a problem in that it was difficult to install in a narrow place, and long wiring was required to connect the two, making wiring troublesome.

For this reason, it is possible to place the light sensor and the lamp close together, or in some cases, to integrate them, but in this way the light sensor will detect the light when the lamp is lit, and even if the lamp is lit, it will be immediately detected. A problem arises in that the light goes out and the indicator no longer functions as an indicator.

Therefore, the present invention makes it possible to reliably light up the light emitting element when the surroundings become dark even if the light sensor and the light emitting element such as a lamp are installed so as to be optically coupled. The aim is to provide a light indicator that can be installed even in narrow spaces.

Another object of the present invention is to provide a light indicator that can integrate a light sensor and a light emitting element and can be made more compact.

Furthermore, even if the heating element is integrated into a lamp, the heat from the lamp can be prevented from affecting the optical sensor.
The present invention aims to provide a light indicator that can prevent a light sensor from shortening its life or becoming unstable due to heat.

Furthermore, it is an object of the present invention to provide a lighting system using a light indicator that can be used as an indicator when lighting a lighting lamp, and can also reliably stop the operation of the indicator when the lighting lamp is turned on. .

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a light emitting element, and a light sensor that is provided to be optically coupled to the light emitting element and detects ambient light including light from the light emitting element. , a removal circuit that removes the influence of the lighting of the light emitting element from the output signal from the optical sensor, and controls the lighting of the light emitting element when the output level of this removal circuit is below a set level, and also controls the lighting of the light emitting element when the output level exceeds the set level. This is a light indicator provided with a control means for controlling the light-emitting element to turn off when the light emitting element is turned off.

It is also a light indicator in which a light emitting element and a light sensor are integrated into the same member and arranged side by side.

It is also a light indicator that integrates a lamp and a light sensor, with a heat shielding member provided between them.

Furthermore, it is a light indicator that integrates a lamp and a light sensor, with the lamp placed above the light sensor in gravity.

Furthermore, a lighting lamp is connected to the power source via an operation switch, and in conjunction with the operation switch, the light indicator is turned off when the operation switch is turned on, and the light indicator is turned on when the operation switch is turned off. This is a lighting system using light indicators in the configuration.

(Function) In the present invention having such a configuration, when the surroundings become dark, the light emitting element is turned on and the light from the light emitting element is detected by the optical sensor, but the influence of this detection output is removed by the removal circuit. . Even when the light emitting element is turned on, the light sensor receives the light and the light emitting element is not immediately turned off.

Also, since the light emitting element and optical sensor are integrated, it is compact.

Further, the heat from the lamp is shielded by the heat shielding member to prevent it from directly reaching the optical sensor.

Furthermore, the heat from the lamp rises upward by 1 mm, so it does not significantly affect the optical sensor.

Furthermore, when the operation switch is turned off to turn off the illumination lamp, the light indicator is powered on and operated. When the operation switch is turned on and the illumination lamp is turned on by the operation of the light indicator, the supply of power to the light indicator is stopped and the operation of the light indicator is stopped.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In this embodiment, the present invention will be described as applied to a tail lamp device of an automobile.

As shown in FIG. 1, a tail lamp 3 serving as an illumination lamp is connected to a battery 1 via a tail lamp switch 2 serving as an operation switch.

Input terminals of a light indicator 4 are connected to both ends of the tail lamp switch 2.

As shown in FIG. 2, the light indicator 4 has an optical sensor 6 and a lamp 7, which is a light emitting element, mounted integrally on a support member 5 with a predetermined distance therebetween. A cap 8 is placed on the support member 5 so as to surround the optical sensor 6 and the lamp 7.

The cap 8 is translucent, and has a light guide in its center that extends from the tip of the cap between the optical sensor 6 and the lamp 7 and that partially contacts the light receiving surface of the optical sensor 6. A body 9 is formed. Further, a reflective surface 10 is formed on the outer circumferential surface of the cap 8.

A heat shield plate 11, which is a heat shield member, is provided on the surface of the light guide 9 facing the lamp 7.

The light guide 9 has a polygonal surface facing the head of the lamp 7 so that the light from the lamp 7 is efficiently radiated to the tip of the cap, which is the incident direction of external light. are doing.

A lighting circuit 12 for lighting the lamp 7 when the light detection level of the optical sensor 6 reaches a predetermined level is housed inside the support member 5.

The lighting circuit 12, as shown in FIG.
．． 16 series circuits, a series circuit of the optical sensor 6 and a resistor 17, and a series circuit of resistors 18 and 19 are connected to each other.

The connection point between the resistors 15 and 16 is connected to the non-inverting input terminal (+) of the comparator 20, and the connection point between the optical sensor 6 and the resistor 17 is connected to the inverting input terminal (-) of the comparator 20. are doing.

The output terminal of the comparator 20 is connected via a diode 21 to an integrating circuit consisting of a resistor 22 and a capacitor 23. This integrating circuit connects one end of the resistor 22 to the diode 2.
Comparator 2 is connected to the cathode of 1 and has hysteresis at the connection point between the other end of the resistor 22 and one end of the capacitor 23.
Connect to the non-inverting input terminal (+) of capacitor 2.
The other end of 3 is connected to the (-) power supply terminal.

A discharge resistor 25 is connected in parallel to the capacitor 23 of the integrating circuit to form a delay circuit.

The resistor 18 is connected to the inverting input terminal (-) of the comparator 24.
．． The base of the transistor 14 is connected to the output terminal of the comparator 24.

The comparator 24 and the transistor 27 constitute a control means.

The comparator 24 is internally set to a first level and a second level lower than this level depending on the input level from the inverting input terminal (-), and the input level to the non-inverting input terminal (+) is set to the second level. When it reaches, it outputs a high level signal,
- Once the output level reaches the high level, the output level will not be inverted to the low level unless the human power level applied to the non-inverting input terminal (+) falls to the second level.

In this embodiment with such a configuration, when the tail lamp switch 2 is in the off state, voltage is applied to the light indicator 4 from the DC power supply 1, enabling its operation.
Also, if switch 2 is on, light indicator 4
The input terminals of the device are short-circuited, and its operation is prohibited.

Now, when the tail lamp switch 2 is off and the surroundings are bright, a large amount of external light enters the optical sensor 6 through the light guide 9, so the light detection level of the optical sensor 6 reaches a predetermined level. exceeds the inverting input terminal of the comparator 20 (
The input level to the non-inverting input terminal (+) is higher than the input level to the non-inverting input terminal (+). Therefore, the output level of comparator 20 becomes low level. In this state, the input level to the non-inverting input terminal (+) of the comparator 24 is lower than the 1st level, and the transistor 14 is turned off. Therefore, the lamp 7 is turned off.

In this state, when the surroundings become dark, such as at dusk, (see Figure 4)
As shown by the dotted line graph A in a), the light detection level of the optical sensor 6 gradually decreases, and when the detection level falls below a predetermined level, the output of the comparator 20 is inverted and becomes a high level. Thus, the capacitor 23 of the integrating circuit is charged, and its charge level gradually rises as shown by the solid line graph B in FIG. 4(a).

When the charge level of the capacitor 23 reaches the level of the comparator 24, the output of the comparator 24 is inverted to high level and the transistor 14 is turned on.

In this way, the lamp 7 comes to light up as shown in FIG. 4(b). The light from the lamp 7 is emitted through the light guide 9 in the direction of incidence of external light.

A part of the light from the lamp 7 also enters the optical sensor 6 via the four-light body 9. Therefore, the light detection level of the light sensor 6 increases under the influence of the light from the lamp 7. When the light detection level of the optical sensor 6 reaches a predetermined level, the output of the comparator 20 is inverted to low level. As a result, the delay circuit operates and the charge in the capacitor 23 is discharged via the discharge resistor 25. When the charge level of the capacitor 23 decreases to the second level of the comparator 24 due to discharge, the output of the comparator 24 is inverted, the transistor 14 is turned off, and the lamp 7 is turned off.

In this way, even if the optical sensor 6 receives light from the lamp 7 and the output of the comparator 20 is reversed, the lamp 7 will not be immediately turned off. In other words, the influence of lighting of the lamp 7 can be removed until the charge level of the capacitor 23 drops to the second level of the comparator 24 due to the operation of the delay circuit.

When the lamp 7 is turned off, the light detection level of the optical sensor 6 falls below a predetermined level, so the output of the comparison JW 20 is again inverted to a high level and charging of the capacitor 23 is started. And the charging 1 novel of capacitor 23 is comparator 2
When the fourth level is reached, the output of the comparator 24 is inverted to high level, the transistor 14 is turned on, and the lamp 7 is lit.

Thereafter, the capacitor 23 is charged and discharged repeatedly in this manner, and the lamp 7 begins to blink at a predetermined period.

By this blinking, the driver knows that the surrounding darkness has reached a state where the tail lamp 3 is turned on, and turns on the tail lamp switch 2. As a result, the tail lamp 3 is turned on and the operation of the light indicator 4 is prohibited.

Even when the optical sensor 6 and the lamp 7 are integrated in this way, the function as an indicator can be fully fulfilled. Further, by integrating the optical sensor 6 and the lamp 7, it is possible to achieve compactness.

Furthermore, since the light guide 9 is used, external light is efficiently incident on the optical sensor 6, and therefore, an inexpensive optical sensor 6 that does not have high light receiving sensitivity can be used. Furthermore, since the light emitted from the lamp 7 is also efficiently radiated in the direction of incidence of external light via the light guide 9, a relatively inexpensive lamp 7 that does not emit a large amount of light can be used.

Furthermore, since a heat shield plate 11 is provided on the surface of the light guide 9 facing the lamp 7, there is no risk that the heat from the lamp 7 will be transmitted to the light receiving surface of the optical sensor 6. can prevent the effects of Therefore, there is no risk that the optical sensor 6 will be thermally destroyed or malfunction due to heat.

Furthermore, since the reflective surface 10 is formed on the outer peripheral surface of the cap, the light from the lamp 7 can be more efficiently radiated in the direction of incidence of external light.

Further, since the cap 8 having the light guide 9 formed thereon is provided, the optical sensor 6 and the lamp 7 can be protected from the outside.

In the above embodiment, a portion of the light from the lamp is also incident on the light sensor to cause the lamp to blink. If the body is brought into contact with the lamp, the distance between the lamp and the light-receiving surface of the photosensor becomes long, so that almost no light from the lamp is received by the photosensor, and therefore the lamp can be lit continuously.

Furthermore, although a lamp was used as the light emitting element in the above embodiment, it may also be a light emitting diode.

Further, in the embodiment described above, if the tip of the cap 8 is opened, the heat of the lamp 7 can be radiated, so that the heat of the lamp 7 hardly affects the optical sensor 6.

Further, the lighting circuit 12 built into the support member 5 is assembled and housed on a circuit board. For example, when the support member 5 has a cylindrical shape, the circuit board is made of a less flexible material such as epoxy material. If it is made of material, the circuit board will be installed in the cylindrical part so as to stand up in the center for ease of assembly, but this will leave a large dead space on both sides of the circuit board. On the other hand, if the circuit board is made of a highly flexible circuit board, it becomes possible to insert the circuit board in a spiral shape or bend it in a serpentine shape, which enables high-density mounting with almost no dead space. This allows the support substrate 5 to be made smaller.

Next, other embodiments of the present invention will be described with reference to the drawings. Note that the same parts as in the above embodiment are given the same reference numerals and detailed explanations will be omitted.

The one shown in FIG.
Series circuit with resistor 26, 27 and capacitor 28
A series circuit is connected.

A parallel circuit of a constant voltage diode 29 and a capacitor 3o is connected in parallel to the series circuit of the resistor 27 and the capacitor 28, and a series circuit of the optical sensor 6 and the resistor 31 is connected in parallel. Incidentally, as the optical sensor 6, for example, a photodiode, a phototransistor, a CdS element, etc. are used.

A diode 32 is connected between the connection point between the resistor 27 and the capacitor 28 and the connection point between the optical sensor 6 and the resistor 31 with the polarities shown.

The resistor 27, capacitor 28, constant voltage diode 29
The circuit consisting of the capacitor 30 and the capacitor 30 constitutes a removal circuit.

Further, a rectangular wave oscillation circuit 33 is provided, and resistors 34 and 35 are connected between the output terminal of this oscillation circuit 33 and the (-) terminal of the DC power supply.
A series circuit with is connected.

The connection point between the resistor 27 and the capacitor 28 is connected to the inverting input terminal (-) of the comparator 36, and the resistor 34.
35 is connected to the non-inverting input terminal (+) of the comparator 36.
is connected to.

The output terminal of the comparator 36 is connected to the base of the transistor 14.

In this embodiment having such a configuration, when the surroundings are bright, the resistance value of the optical sensor 6 is small, so the potential on the cathode side of the diode 32 is high, and the charge level of the capacitor 28 is also high. The potential on both sides is also high. Therefore, in this state, even if the rectangular wave signal from the rectangular wave oscillation circuit 33 is divided by the resistors 34 and 35 and supplied to the non-inverting input terminal (10) of the comparator 36, the higher level of the rectangular wave signal is Furthermore, since the level input manually to the inverting input terminal (-) of the comparator 36 is higher, the output level of the comparator 36 is at a low level. Therefore, the lamp 7 is in an off state.

In this state, when the surroundings become dark, the resistance value of the optical sensor 6 increases, so the potential on the cathode side of the diode becomes low, and therefore the potential on the anode side, that is, the charge level of the capacitor 28 also becomes low. This level drop increases as the surroundings become darker, and eventually the level comes to be between the high level and low level of the rectangular wave signal from the rectangular wave transmitting circuit 33. As a result, the output of the comparator 52 is inverted between high and low levels in synchronization with the period of the rectangular wave signal, and the transistor 14 turns on and off, causing the lamp 7 to blink.

In this way, when the surroundings become dark, the lamp 7 blinks in synchronization with the rectangular wave signal from the rectangular wave transmitting circuit 33 to notify the user.

When lamp 7 lights up, the light is transmitted to the light sensor.
6, and the potential on the cand side of the diode 32 rises, but since the capacitor 28 is charged via the resistor 27, its charge level does not rise immediately. Thus, the rectangular wave signal becomes low level and the lamp 7 is turned off before the charge level of the capacitor 28 becomes higher than the high level of the rectangular wave signal.

In this way, the influence of light from the lamp 7 can be removed.

In this way, in this embodiment as well, when the surroundings are dark, the lamp 7 can be reliably blinked even if the optical sensor 6 and the lamp 7 are integrated, and the same effect as in the previous embodiment can be obtained. .

6, an NPN transistor 37 is connected in parallel with a series circuit of a diode 21 and a resistor 22 with its collector on the anode side of the diode 21, and the base of the transistor 37 is connected with a resistor 38 and a capacitor 39. are connected in series to the cathode of the diode 13. A resistor 40 is connected between the base and emitter of the transistor 37.

In this embodiment with such a configuration, for example, when the tail lamp switch 2 is in the off state and the surroundings are dark and the car key is inserted and the battery 1 is turned on, the output of the comparator 20 immediately goes to a high level. becomes. Further, a base current flows through the transistor 37 via the capacitor 39 and the resistor 38, turning on the transistor 37 immediately.

As a result, the capacitor 23 is instantly charged, and the output of the comparator 24 becomes high level, turning on the transistor 14. In this way, the lamp 7 is immediately turned on.

In this manner, when the battery 1 is inserted when the surroundings are dark, the lamp 7 is immediately turned on to notify that the tail lamp 3 is in a state where it should be turned on.

The transistor 37 is turned on when the battery is turned on, but when the three capacitors are fully charged, the base current stops flowing and the transistor 37 is turned off. Therefore, from now on, the same operation as in the embodiment shown in FIG. 3 will be performed.

In this embodiment, by reversing the connections to the input terminals (+) and (-) of each comparator 20, 24, it is possible to prevent the lamp 7 from lighting up when the battery 1 is inserted in bright surroundings. can. This is because if the transistor 37 were not present, the capacitor 23 would be at a low level for a while when the battery 1 is turned on, so the output of the comparator 24 would be at a high level and then change to a low level.
This results in the inconvenience that the lamp 7 is lit during the high level period.

Note that the transistor 37 may be an FET or an analog switch.

In the circuit shown in FIG. 7, an input terminal of a diode bridge circuit 52 is connected between input terminals 51a and 51b, and a lamp 7 is connected between the output terminals of the bridge circuit 52 via a transistor 14.

Further, a resistor 53.5 is connected between the output terminals of the bridge circuit 52.
A series voltage dividing circuit of 4 and a series voltage dividing circuit of 55 and 56 resistors are connected.

The current output from the optical sensor (photodiode) 6 is supplied to a current-voltage conversion circuit 57 consisting of an operational amplifier, and the output of the conversion circuit 57 is used as the non-inverting input of a first comparator 58 consisting of an operational amplifier. An operational amplifier 60, an NPN transistor 61, and a diode 62 are input to the terminal (+) through five inverting circuits composed of operational amplifiers.
It is supplied to a voltage-current conversion circuit 63 consisting of.

The inverting input terminal (-) of the first comparator 58 is connected to the connection point of the resistors 53 and 54.

The output terminal of the first comparator 58 is connected to a charging circuit formed by connecting a resistor 64°, a diode 65, and a capacitor 66 in series. A discharge circuit consisting of a PNPN upper type transistor 67 and a series circuit of the transistor 61 and a resistor 68 is connected to the capacitor 66 in parallel.

The voltage across the terminals of the capacitor 66 is supplied to the inverting input terminal (-) of a second comparator 69 consisting of an operational amplifier. The non-inverting input terminal (+) of the second comparator 69 is connected to the connection point of the resistors 55 and 56.

The output terminals of the six second comparators are connected to the connection point of the resistors 55 and 56 via a resistor 70 and a resistor 71.
It is connected to the base of the transistor 67 through the resistor 72, and to the base of the transistor 14 through the resistor 72. Note that a resistor 73 is connected between the base and emitter of the transistor 14.

In this embodiment with such a configuration, the input terminal 51a
, 51b are connected to the battery 1. At this time, regardless of which polarity the input terminals 51a and 51b are connected to the battery 1, there is a diode bridge circuit 52, so the polarity of the DC output from the bridge circuit 52 is not shown in the figure. Becomes polar. Therefore, the input terminals 51a and 51b are connected to the battery 1.
There is no need to consider polarity when connecting.

When the surroundings are bright, the output of the current-voltage conversion circuit 57 is at a high level, so the output of the first comparator 58 is at a high level, and the capacitor 66 is charged via the resistor 64 and the diode 65. The voltage between the terminals of 66 is higher than the 6th level of the second comparator 69, and the output of the second comparator 69 is at a low level. Thus, the transistor 14 is turned off and the lamp 7 is turned off. Further, a base current flows from the base of the transistor 67 to the output terminal of the second comparator 69 via the resistor 71.

In this state, when the surrounding brightness gradually becomes darker as shown by the dotted line graph A in FIG. 8, the amount of light received by the optical sensor 6 decreases, and the output level of the current-voltage conversion circuit 57 gradually decreases.

When the surrounding brightness becomes darker than a certain brightness, the first comparator 58 is inverted and its output becomes low level. Charging of the capacitor 66 is thus stopped.

On the other hand, when the output level of the current-voltage conversion circuit 57 decreases, the output level of the inversion circuit 59 increases.

Thus, the transistor 61 is turned on by the output of the voltage-current conversion circuit 63.

Thus, the charge on capacitor 66 is transferred to transistor 67.6.
1 and the resistor 68. As shown by the solid line graph B in FIG. 8, when the level between the terminals of the capacitor 66 becomes lower than the second level of the second comparator 69, the output of the second comparator 69 becomes high level. It becomes reversed. As a result, the transistor 14 is turned on and the lamp 7 is turned on. At this time, the comparison level of the second comparator 69 changes to the second level.

When the lamp 7 is turned on, the light sensor 6 receives the light, so that the output of the current-voltage conversion circuit 57 becomes high again. Thus, the output of the first comparator 58 is inverted to a high level, and charging of the capacitor 66 is started. At this time, since the output of the inverting circuit 59 becomes low level, the transistor 61 is turned off by the voltage-current conversion circuit 63.

In this way, the charge level of the capacitor 66 starts to rise, and when the level between the terminals of the capacitor 66 becomes equal to or lower than the second level of the second comparator 69, the output level of the second comparator 69 is inverted and the transistor 14 is turned on. The lamp 7 is then turned off.

When the lamp 7 goes out, the amount of light received by the optical sensor 6 decreases, so the output level of the first comparator 58 is reversed to low level, and charging of the capacitor 66 is stopped, and the voltage-current conversion circuit 63 At 7, the transistor 61 is turned on and the capacitor 66 starts discharging. When the level between the terminals of the capacitor 66 becomes lower than the second level of the second comparator 69, the second comparator 69 is inverted and its output level becomes high level, turning on the transistor 14 and lighting the lamp 7. It becomes like this.

In this manner, the lamp 7 is operated so that the charge level of the capacitor 66 is determined by the second comparator 69 after the capacitor 66 is discharged.
Capacitor 66 at a time interval until it drops below the level
will remain lit until the charge level increases from the second level to the second level, and the blinking action will notify you that the surroundings have become dark.

In this embodiment, when the amount of light received by the optical sensor 6 decreases as the surroundings become darker, the output level of the current-voltage conversion circuit 57 decreases, and the output level of the five inverting circuits increases. Therefore, the output of the voltage-current conversion circuit 63 increases, and the amount of base current flowing to the base of the transistor 61 increases.

Transistor 61 is thus biased more deeply and its internal resistance is lowered. This increases the amount of current discharged from the capacitor 66. This means that the time required for the charge level of the capacitor 66 to drop to the second level after the lamp 7 is turned off becomes faster.

In this way, the darker the surroundings become, the shorter the time interval during which the lamp 7 is turned off becomes more alert to the driver.

The light-off time intervals a, b, c, and d shown in FIG. 8 are shown in relation to ambient light as shown in FIG. 9.

In this embodiment, the NPN transistor 14 is connected in series with the lamp 7, but the invention is not necessarily limited to this. Instead of the transistor 14, a bidirectional transistor or a bidirectional thyristor may be used to connect the lamp 7 and A series circuit may be directly connected to the input terminals 51a and 51b.

Even in this case, operation can be achieved regardless of which polarity the input terminals 51a and 51b are connected to the battery 1.

10, a capacitor 81 is connected between the cathode terminal of the diode 13 and the output terminal of the first comparator 58.
A time constant circuit 84 is constructed by connecting a parallel circuit of a resistor 82 and a series circuit of a diode 83. Note that the diode 83 has its cathode connected to the output terminal of the first comparator 58.

A second comparator 86 forming a waveform shaping circuit 85 connects the connection point between the capacitor 81 and the anode of the diode 83.
Connected to the non-inverting input terminal (+) of the This waveform shaping circuit 85 is connected between the input terminals via a diode 13.

A resistor 87 connected between the input terminals via the diode 13 is connected to the inverting input terminal (-) of the second comparator 86.
．． The connection points of resistors 87 and 88 of the 88 series voltage divider circuits are connected. The output terminal of the second comparator 86 is NPN.
It is connected to the base of a type transistor 89.

Further, an astable multi-by-break 90 is connected to the input terminal via a diode 13.

The astable multi-by-break 90 is provided with an operational amplifier 91, a capacitor 92 is connected between its inverting input terminal (-) and the negative side of the input terminal, and the transistor 89 is connected in parallel to the capacitor 92. .

A resistor 93 connected between the input terminals via the diode 13 is connected to the non-inverting input terminal (+) of the operational amplifier 91.
．． The connection points of resistors 93 and 94 of the series voltage divider circuit 94 are connected. A resistor 95 is connected between the output terminal and the inverting input terminal (-) of the operational amplifier 91.

The output terminal of the operational amplifier 91 is connected to the base of the transistor 14 via the resistor 72.

In this embodiment, when the surroundings are bright, the output level of the current-voltage conversion circuit 57 is high, so the output level of the first comparator 58 is high level.

Therefore, the connection point P between the capacitor 81 and the diode 83
is at a high level, and the output level of the second comparator 86 is also at a high level.

In this state, the transistor 89 is on, and the astable multi-vibration break 90 has stopped oscillating.

Transistor 14 is therefore held off and lamp 7
is off.

In this state, the surroundings become dark and the amount of light received by the optical sensor 6 is at the first level.
When the temperature drops to point a in (a) of Figure 1, (b) of Figure 11
The output level of the first comparator 58 is inverted to low level as shown in FIG.

As a result, a charging current begins to flow to the capacitor 81 via the diode 83, and the level at the connection point P between the capacitor 81 and the diode 83 changes to the approximately negative input terminal (- ) is equal to the level of

As a result, the output level of the second comparator 86 is inverted to low level as shown in FIG.
is operated off. Charging of the capacitor 92 is then started, and the astable multivibrator 90 starts to oscillate.

In this oscillation operation, the capacitor 92 is charged /<
/l/ is at level L1°L as shown in FIG. 11(e).
2 will be going back and forth.

In this way, the transistor 14 is repeatedly turned on and off by the oscillation output of the astable multi-byte break 90, and the lamp 7 blinks as shown in FIG. 11(f). In this way, it is possible to notify the driver that the surrounding area has become dark.

In this operation, when the lamp 7 is lit, the light is received by the optical sensor 6, and the output level of the first comparator 58 is inverted to high level, and the level of the point P changes as shown in FIG. However, since the lamp 7 goes out before the level reaches the threshold level S of the second comparator 86, the output level of the second comparator 86 remains at a low level. hold. In this way, the oscillation operation of the astable multi-vib break 90 is maintained.

In this state, when the surroundings become brighter and the amount of light received by the optical sensor 6 rises to point b in (a) of FIG. 11, the first comparator 5
The output level of No. 8 is inverted to high level and maintains that state.

Therefore, the capacitor 81 continues to be charged and P
The level of the point eventually reaches level S as shown in FIG. 11(C). In this way, the output level of the second comparator 86 is inverted to a high level, turning on the transistor 89 and stopping the astable multi-by-break 90 oscillation operation. In this way, the lamp 7 is turned off.

In this way, the astable multivibrator 90 can be operated to oscillate and the lamp 7 can be made to blink only when the surroundings are dark.

FIG. 12 shows another embodiment of the integrated structure of the optical sensor 6 and the lamp 7 shown in FIG. The optical sensor 6 and the lamp 7 are arranged and fixed at a predetermined interval, and the optical sensor 6 and the lamp 7 are surrounded by a cylinder 102. A spring plate contact 1 is provided on the upper part of the support member 101 so as to protrude outward from the lower end of the cylindrical body 102.
03a, 103b are provided facing each other, and a locking piece 10 is provided at a position shifted by 90'' from each contact point 103a, 103b.
4a and 104b are provided. Further, a positioning locking piece 105 is made to protrude between the contact 103b and the locking piece 104a. In this way, the light indicator main body is configured as a socket type.

The first thing that was integrated in this way was
As shown in FIG. 3, it is attached to the bottom of a panel 106 with an open front.

That is, at the bottom of the panel 106, as shown in FIG.
A hole 109 is provided with a locking portion 108 to which the positioning locking pieces 105 and 07a, 107b are locked, and each locking piece 104a, 104 is inserted into the hole 109
b, 105 respectively to the locking parts 107a, 107b, 10
It is fixed by rotationally locking at 8. At this time, positioning with the panel 106 is performed by inserting and locking the positioning locking piece 105 into the locking part 108, and in the final locked state, the optical sensor 6 is connected to the panel 106 as shown in FIG. On the other hand, the lamp 7 is located on the upper side in the weight direction. Also, at this time, the two spring plate contacts 103a and 103b come to be pressed against the outside of the bottom portion of the panel 106.

In this embodiment, the light indicator body in which the optical sensor 6 and the lamp 7 are integrated can be easily attached to the panel 106, and the lamp 7 can be reliably positioned above in the direction of gravity.

Further, since the heat emitted from the lamp 7 is radiated upward, the influence of the lamp heat on the optical sensor 6 can be suppressed as much as possible.

Note that if the peripheral surface of the support member 101 is knurled or roughened, there will be no slippage when attaching the light indicator body to the panel 106, making the attachment process easier.

Although a lamp is used as the light emitting element in each of the above embodiments, the light emitting element is not necessarily limited to this, and a light emitting diode or the like may be used.

Further, in each of the above embodiments, the notification is given by blinking the lamp, but the notification is not necessarily limited to this, and the notification may be made by continuously lighting the lamp.

[Effects of the Invention] As detailed above, according to the present invention, even if a light sensor and a light emitting element such as a lamp are installed so as to be optically coupled, the light emitting element can be reliably turned on when the surroundings become dark. Therefore, it is possible to provide a light indicator in which the optical sensor and the light emitting element can be installed even in a relatively narrow space.

Further, it is possible to provide a light indicator that can integrate a light sensor and a light emitting element and can be made more compact.

Furthermore, even if the heating element is integrated into a lamp, the heat from the lamp can be prevented from affecting the optical sensor.
It is possible to provide a light indicator that can prevent an optical sensor from shortening its life or becoming unstable due to heat.

Furthermore, it is possible to provide a lighting system using a light indicator that can be used as an indicator when lighting an illumination lamp, and can surely stop the operation of the indicator when the illumination lamp is turned on.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention.
Figure 1 is a circuit diagram of the tail lamp device, Figure 2 is a partial sectional view showing the structure of the light indicator, Figure 3 is a circuit diagram of the light indicator, and Figure 4 is a waveform diagram to explain the operation of Figure 3. , Fig. 5 to Fig. 14 show other embodiments of the present invention, Fig. 5, Fig. 6, and Fig. 7 are circuit diagrams, and Fig. 8 is a diagram for explaining the operation of Fig. 7. A waveform diagram, FIG. 9 is a graph showing the relationship between ambient light and lamp extinguishing time interval in the embodiment of FIG. 7, FIG. 10 is a circuit diagram, and FIG. 11 is a graph for explaining the operation of FIG. 10. The waveform diagrams, FIGS. 12, 13, and 14 are diagrams showing the structure of the light indicator. 1...Battery 2...Tail light switch,
3...Tail lamp, 4...Light indicator,
5... Support member, 6... Optical sensor 7... Lamp (light emitting element) 14... NPN type transistor, 20
... Comparator, 22 ... Resistor, 23 ... Capacitor, 24 ... Comparator, 25 ... Discharge resistance. Figure 1 Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure (a) (b) Figure Figure Figure

Claims (6)

[Claims] (1) a light-emitting element; a light sensor that is provided to be optically coupled to the light-emitting element and detects ambient light including light from the light-emitting element; A removal circuit that removes the effects of lighting;
A light indicator comprising control means for controlling the light emitting element to turn on when the output level of the removal circuit is below a set level and controlling the light emitting element to turn off when the output level exceeds the set level. (2) The light indicator according to claim (1), wherein the removal circuit is a delay circuit. (3) The light indicator according to claim (1), wherein the light emitting element and the optical sensor are integrated into the same member and arranged side by side. (4) A claim characterized in that the light emitting element is a lamp, and a heat shielding member is provided between the lamp and the optical sensor.
3) Light indicator as described. (5) Claim (3) characterized in that the light emitting element is a lamp, and the lamp is provided above the optical sensor due to gravity.
Light indicators listed. (6) A lighting lamp is connected to the power source via an operation switch, and the light indicator is turned off when the operation switch is turned on in conjunction with the operation switch, and the light indicator is turned on when the operation switch is turned off. A lighting system using a light indicator characterized by: