JP3023196U - Portable light with automatic lighting function during an earthquake - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] In a portable light, when the surroundings are dark at night, for example, when a large vibration such as an earthquake with a seismic intensity of 3 or more is received, the light is automatically turned on to illuminate the surroundings. However, if the surroundings are bright, the light should not turn on. A vibration sensing sensor incorporated in a lighting circuit of a portable light and generating a potential change signal by vibration,
A conduction time setting circuit for converting this signal into a positive rectangular wave pulse, a light bulb connected in parallel, a power supply transistor which becomes conductive by a rectangular wave pulse, a photoconductive cell and a resistor connected in series and The intermediate point is connected to the lighting transistor, and from the voltage division ratio of the photoconductive cell and the resistance, when the ambient illuminance is below a certain level, the illuminance / darkness determination circuit for bringing the lighting transistor into a conductive state, and the lighting transistor as the light bulb. It is provided with a lighting / holding circuit that is connected in series and maintains the conductive state even after it becomes conductive.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention generally relates to a portable light used in an emergency or special work, and more specifically, when a large shake (vibration) such as an earthquake occurs in a dark environment such as at night, it is automatically operated. The present invention relates to a portable light with an automatic lighting function during an earthquake, where the light can be turned on to illuminate its surroundings and the light does not turn on due to vibration when the surroundings are bright.

[0002]

[Prior art]

 Portable lights such as flashlights have been used as industrial lighting equipment and as necessities in general households. However, conventional portable lights generally have a mechanism in which a light is turned on only when a person turns on a lighting switch.

[0003]

[Problems to be solved by the device]

 By the way, recently, it has become a hot topic that earthquakes, especially large-scale earthquakes such as the Great Kanto Earthquake and the Southern Hyogo Prefecture Earthquake, will occur anywhere in Japan in the near future, and when such an earthquake occurs at night. , Because the surroundings are in darkness, people have to feel for the portable light in the dark, and even if they remember where to put the portable light Therefore, it is necessary to move the portable light, and before it finds the portable light, it may collide with furniture, office equipment, etc., and be injured, and may be injured or, in the worst case, broken. Above all, if a building is damaged by an earthquake, the interior of the building will be different from before and the chances of human injury will be higher. In short, in the past, when an earthquake occurred at night, people had to evacuate to a safe place as quickly as possible, but they could not illuminate the surroundings, especially around themselves, so quickly. In addition, she could not evacuate smoothly.

[0004] Therefore, there has been a demand for practical application of a portable light that automatically lights up by detecting its vibration (shaking) when an earthquake occurs, but on the other hand, when the surrounding environment is bright, such as during the day, the earthquake may occur. In case of occurrence, the portable light does not need to be turned on automatically. A portable light of the type that automatically turns on during an earthquake has already been proposed in Japanese Patent Application No. Sho 53-169355, but it can be turned on automatically by vibrations such as an earthquake when the surroundings are dark, such as at night. Portable lights have not been put to practical use so far.

The present invention has been made in consideration of the above-mentioned conventional circumstances, and the first problem is that when the surroundings are dark such as at night, when a large vibration such as an earthquake is received, It can automatically illuminate its surroundings, but when the surroundings are bright, it is to provide a portable light with an automatic lighting function during an earthquake where the light does not light.

The above problem is to devise an illuminance determination means (sensor, circuit, etc.) that can determine the surrounding light and darkness and is suitable for a portable light, and provide this for the lighting circuit of the light. However, the circuit configuration in which this means operates even in normal times is not preferable because it wastes the battery of the power source. It is more advantageous to configure the illuminance determining means so that it can operate only when it receives vibration such as an earthquake. Therefore, another problem of the present invention is to determine the brightness of the surroundings only when it is subjected to a vibration such as an earthquake. Therefore, it is possible to prevent unnecessary consumption of the power supply battery and extend its life. To provide a portable light with a function. Other problems of the present invention will be understood by referring to the description of the specification including the claims for utility model and the drawings.

[0007]

[Means for Solving the Problems]

 The present invention includes a vibration sensor that generates a signal indicating a potential change due to vibration, and a photoconductive cell. When the ambient illuminance is lower than a predetermined level, it is possible to determine whether the light is bright or dark. Circuit, and the illuminance / brightness determination circuit is configured to be activated by the generation of a signal in the vibration sensor and to operate only for a while, so that an earthquake or the like can be generated only when the surroundings are dark, such as at night. At the same time, the portable light can be turned on automatically, and consumption of the power supply battery due to normal operation of the illuminance / darkness judgment circuit is prevented.

More specifically, the present invention is a signal that is incorporated in a lighting circuit including a light bulb of a portable light and a battery of a power source, and a potential of which changes due to vibration (hereinafter referred to as a potential change signal). A vibration-sensing sensor that generates a voltage; a conduction time setting circuit that is connected to the vibration-sensing sensor and that converts the potential change signal into a positive rectangular wave pulse that is determined by a predetermined time constant; A power supply transistor which is connected in parallel and whose base terminal is connected to the conduction time setting circuit, and which becomes conductive by the input of the rectangular wave pulse; a photoconductive cell (for example, a CdS cell or a CdSe cell); A resistor is connected in series with the power supply transistor, and an intermediate point between them is connected to a lighting transistor. From the voltage division ratio of the photoconductive cell and the resistor, the photoconductive cell is connected. When the ambient light around the lighting circuit is below a certain level, the illuminance / darkness determination circuit for bringing the lighting transistor into conduction and the lighting transistor are connected in series with the light bulb of the lighting circuit. The present invention relates to a portable light with an automatic lighting function during an earthquake, which is provided with a lighting / holding circuit that maintains the conductive state even after the transistor reaches the conductive state.

Further, more preferably, the present invention provides a vibration sensing sensor of a more preferable embodiment, that is, a ring of a conductor and a conductor suspended through the ring and swingably suspended. A portable light with an automatic lighting function during an earthquake, which is composed of a pendulum, and one of the ring and the pendulum is connected to a power battery of a light and the other is grounded. .

Further, in another aspect of the present invention, a voltage monitoring circuit connected to the lighting circuit and monitoring the voltage of a power supply battery, and a voltage monitoring circuit connected to the voltage monitoring circuit, the voltage value falls below a predetermined value. The present invention also relates to the portable light having the automatic lighting function at the time of an earthquake, which further comprises a battery exhaustion display means which is constituted by a light emitting diode that lights up at the time.

[0011]

[Embodiment of device]

 A portable light generally has a lighting circuit that connects a light bulb, a power supply battery (dry battery, rechargeable battery, etc.), and a lighting switch. The portable light of the present invention comprises, in this lighting circuit, a lighting transistor connected in series with a light bulb and a power supply transistor connected in parallel with the light bulb. As will be described in detail below, when the lighting transistor is turned on, the light bulb of the light is turned on, and when the power supply transistor is turned on, the illuminance / brightness determination circuit is activated. .

The vibration sensor used in the present invention is incorporated in the above lighting circuit, and an electric potential change signal, for example, a low potential to a high potential (eg, 0 V to a potential close to the voltage of the power supply battery) is caused by vibration for an extremely short time. A sensor that produces a pulse of width. A more specific and preferred vibration sensing sensor is composed of a conductor ring and a conductor pendulum suspended swingably through the ring, and of the ring and pendulum. One (generally a pendulum) is connected to the light's power cell and the other (generally a ring) is grounded. This type of vibration sensing sensor is usually built into the light body so that the pendulum is suspended through the ring when the light is in its normal position (upright position). Therefore, when subjected to vibration, the pendulum (which is connected to the battery) swings and contacts the ring (which is grounded), and changes from a low potential to a high potential. ) Occurs in the ring. When subjected to vibration such as seismic waves, chattering occurs and a potential change signal with a disturbed waveform is generated. On the contrary, when the light is in an unusual posture (for example, in a tilted posture or a rolled-up posture), the pendulum is in contact with and supported by the ring. Therefore, when a vibration is received, the pendulum swings and moves away from the ring, so that a potential change signal that shifts from a high potential to a low potential is generated in the ring. During vibration such as seismic waves, chattering occurs and a potential change signal with a disturbed waveform is generated.

The conduction time setting circuit in the present invention includes a capacitor Ct and a resistor Rt, is connected to a vibration detecting sensor (a ring in the vibration detecting sensor of the above type) on the input side, and is connected to the power source on the output side. In the circuit connected to the supply transistor, especially in the IC circuit, when the potential change signal of the extremely short time width generated by the vibration sensor is input, the pulse width is determined by the time constant Ct.Rt. It is configured to be converted into a positive rectangular wave pulse and output to the power supply transistor. That is, the conduction time setting circuit supplies a high-potential positive current (rectangular wave current) to the power supply transistor only during the pulse width determined by the time constants Ct and Rt when vibration occurs.

The power supply transistor has a base terminal connected to the conduction time setting circuit, a collector terminal connected to the lighting circuit, and an emitter terminal connected to an illuminance / brightness determination circuit, When a rectangular wave pulse is input from the conduction time setting circuit, the collector terminal and the emitter terminal become conductive, and current flows from the lighting circuit to the illuminance / brightness determination circuit. In other words, the illuminance / brightness determination circuit can be operated by the conduction of the power supply transistor, but this is limited to the time corresponding to the pulse width of the rectangular wave pulse.

The illuminance / brightness determination circuit connects the photoconductive cell and the resistor R _L in series with the power supply transistor described above, and connects the intermediate point between them through another transistor, a resistor, etc. (The base terminal thereof) and, when the illuminance around the photoconductive cell is below a certain level, based on the voltage division ratio of the photoconductive cell and the resistance _RL , bring the lighting transistor into a conductive state. It has a circuit configuration that enables The above photoconductive cell is an illuminance sensor whose internal resistance changes depending on the amount of light received.When the illuminance around the cell is higher, the internal resistance is lower, and conversely when the illuminance around the cell is lower. , The internal resistance becomes higher. Examples of the photoconductive cell include a CdS cell and a CdSe cell. The CdS cell is more suitable for use because it has better sensitivity to visible light and is cheaper. The resistor R _L may be a variable resistor, but is set to an appropriate resistance value when used. The photoconductive cell and the resistor R _L are connected in series and connected to the lighting circuit (that is, in parallel with the light bulb) via a power supply transistor, and the resistor R _L is normally grounded. Therefore, the potential of these intermediate points A is determined by the voltage division ratio of the internal resistance of the photoconductive cell and the resistance R _{L. When} the surroundings are bright and the illuminance is high, the potential of the intermediate point A shifts to the higher side and the voltage of the battery On the other hand, when the surroundings are dark and the illuminance is low, the potential at the intermediate point A shifts to the lower side and becomes a value near 0V. Then, the illuminance / brightness / darkness determination circuit is configured to bring the lighting transistor into a conducting state or a non-conducting state in response to such a change in potential at the intermediate point A. However, the operation of the illuminance / brightness determination circuit is limited to the time during which the power supply transistor is conductive and the power supply current is flowing.

The lighting / holding circuit is a circuit including the above-mentioned lighting transistor (connected in series with the light bulb of the lighting circuit) and the like, and when the lighting transistor becomes conductive by the operation of the illuminance / brightness / darkness determination circuit, a current Flows from the battery of the power supply to the light bulb, the light bulb is lit, and even after that, that is, even after the operation of the illuminance / brightness determination circuit is completed, the lighting transistor can be kept in the conductive state.

Finally, in the portable light according to a more preferable aspect of the present invention, the dead battery indicator, which is additionally provided, is connected to the above-mentioned lighting circuit, for example, to monitor the voltage of the power supply battery. It is composed of a circuit (IC) and a light emitting diode which is connected to the voltage monitoring circuit and is turned on when the voltage value drops below a predetermined value (for example, 3 V). A light emitting die auto is usually equipped so that the light can be seen from the outside. Therefore, the voltage monitoring circuit constantly monitors the voltage value between the light bulb of the portable light and the power battery, but when the voltage value drops below the required voltage value due to the exhaustion of the battery with time, Sends the current to the emission die auto. As a result, the light emitting diode is turned on, and the person visually recognizes the lighting from the outside, so that the battery in the portable light is exhausted and it is possible to know that it is time to replace the battery.

[0018]

【Example】

 Hereinafter, the present invention will be made clearer by explaining an example considered to be the best mode of the present invention with reference to the drawings.

Embodiment 1 A portable light with an automatic lighting function during an earthquake according to this embodiment is a box-shaped light as shown in FIG. 2, and a light bulb 1 (for example, a PR bulb) is provided on the front surface of a light body 21. Is equipped with a reflecting mirror 23, and a battery for power supply (4 AA type 1.5V dry batteries) 2 ... Is built in, and a handle 22 is formed on the upper surface of the light body 21. The handle 22 is provided with a push-button lighting switch 4, and a sensor operating switch 15, a photoconductive cell (CdS cell) 9, and a light-emitting diode for indicating that the battery is off are provided on the side surface of the box-shaped light body 21. 14 are provided. The portable light of this example has a lighting circuit including a light bulb 1, a battery 2 and a lighting switch 4, as described in the description of FIG. When the battery is switched from ON to ON, the electric bulb 1 is energized by the battery 2 and the electric bulb 1 of the light is turned on. Characteristically, the portable light of this embodiment is provided with a vibration sensitive circuit unit 18 including a vibration sensor 5 as described below in the light body 21 (FIG. 2).

3 and 4 show the vibration sensor 5 described above in an enlarged manner. FIG. 3 shows the configuration of the sensor 5 when the light body 21 is in a normal upright posture, and FIG. 4 shows the sensor 5 when the light body 21 is in an unusual posture, for example, in a tilted or overturned posture. Shows the form of. As shown in these figures, the vibration sensor 5 includes a conductor ring 16 and a conductor pendulum 17 having a spiral weight on a printed circuit board 19 (having the electric circuit of FIG. 1). Both of them are erected so as to be able to be energized, and the pendulum 16 is swingably suspended through a ring 17. When the light body 21 is in a normal upright position, the pendulum 16 is vertically suspended through the ring 17 and separated from the ring 17, as shown in FIG. When the pendulum 16 changes to a posture other than the normal one, for example, the pendulum 16 swings and is supported by the ring 17 and comes into contact with the ring 17, as shown in FIG.

FIG. 1 shows a circuit configuration of a portable light with an automatic lighting function during an earthquake according to this embodiment. The circuit on the left side shown in this figure is connected to the circuit on the right side. That is, the first terminal (out), the second terminal (6V) and the third terminal (GND) are connected to each other. Further, in the figure, 3 indicates a lighting circuit including the light bulb 1, the power source battery 2 and the lighting switch 4, and 5 indicates the vibration detection sensor. Therefore, 16 represents a conductor ring and 17 represents a conductor pendulum. Reference numeral 15 indicates the above sensor operation switch.

Of the vibration sensor 5 incorporated in the lighting circuit 3, the pendulum 17 is connected to the light battery 2 and is applied with a positive voltage (6 V), while the ring 16 is connected via the resistor R1. It is grounded. Therefore, when the light body 21 is in a normal upright posture, that is, when the pendulum 17 is suspended through the ring 16 and is in a non-contact state (FIG. 3), it receives vibration. The pendulum 17 swings left and right and contacts the ring 16. At that time, a potential change signal A having an extremely short time width at which the potential changes from the low potential (0 V) to the positive high potential is generated in the ring 16. On the other hand, when the light body 21 is placed in an unusual posture, for example, in a lying posture, that is, when the pendulum 17 is supported by the ring 16 and is in contact (FIG. 4), when it receives vibration, The pendulum 17 floats upward and separates from the ring 16. At that time, a potential change signal B having a very short time width that shifts from the high potential (6 V) to the low potential is generated in the ring 16. Therefore, the vibration sensor 5 is configured to generate the potential change signals A and B when the light main body 21 is in a normal posture or a posture different from the normal posture. In particular, when a vibration such as an earthquake wave is received, chattering occurs, the potential change signal A or B having a disturbed waveform is generated, or both signals A and B are generated at the same time.

In addition to the vibration sensor 5, the lighting circuit 3 incorporates a conduction time setting circuit 6, a power supply transistor 7, an illuminance / brightness / darkness determination circuit 8 and a lighting / holding circuit 10.

The conduction time setting circuit 6 is composed of a waveform shaping IC 20 (IC2), a capacitor Ct, a variable resistor Rt (connected to terminals T ₁ and T _{2 of} IC2), a capacitor C2, a resistor R2, etc. On the input side, the input terminal B of the waveform shaping IC 20 is connected to the ring 16 of the vibration sensing sensor 5, and on the output side, the output terminal Q of the waveform shaping IC 20 is connected to the base terminal of the power supply transistor 7. Therefore, the circuit 6 triggers when the potential change signals A and B generated by the vibration sensor 5 are input, that is, when the low potential changes to the high potential (and / or the high potential changes to the low potential). The potential change signal is converted into a positive high-potential rectangular wave pulse whose pulse width is determined by the time constant Ct.multidot.Rt, and is output to the power supply transistor 7. In other words, when the vibration occurs, the conduction time setting circuit 6 supplies the high-potential rectangular wave current to the power supply transistor for the duration of the pulse width determined by the time constants Ct and Rt based on the potential change signal generated. Supply to 7.

The power supply transistor 7 is an NPN transistor Q1 whose base terminal is connected to the conduction time setting circuit 6 and whose collector terminal is connected to the lighting circuit 3 (that is, connected in parallel with the light bulb 1). When the rectangular wave pulse C is input from the conduction time setting circuit 6, the emitter terminal is connected to the illuminance / brightness determination circuit 8, whereby the collector terminal and the emitter terminal become conductive, and the current is turned on. From 3 to the illuminance brightness determination circuit 8. Therefore, the illuminance / brightness determination circuit 8 can be operated by this energization, but the energization time in this case is limited to the time corresponding to the pulse width of the rectangular wave pulse.

The illuminance / brightness / darkness determination circuit 8 connects the photoconductive cell (CdS cell) 9 and the variable resistance R _L in series between the power supply transistor 7 and the ground potential, and connects the middle point A between these resistances. It is connected to the lighting transistor 11 (its base terminal) of the lighting / holding circuit 10 via R3, NPN transistor Q2, resistor R6 (capacitor C3), and NPN transistor Q3. The collector terminal of the transistor Q2 is connected to the emitter terminal of the power supply transistor 7 via the resistor R4, and the emitter terminal thereof is grounded via the resistor R5. The resistor R6 and the capacitor C3 connected between the collector terminal of the transistor Q2 and the base terminal of the transistor Q3 are arranged in parallel and are grounded via the resistor R7. The collector terminal of the transistor Q3 is connected to the lighting circuit 3 via the resistor R8, and the emitter terminal of the transistor Q3 is connected to the emitter terminal of the transistor Q2. The photoconductive cell 9 is an illuminance sensor whose internal resistance changes according to the amount of light received. When the illuminance around the cell is higher, the internal resistance is lower, and conversely, when the illuminance around the cell is lower, the internal resistance is lower. The resistance is higher. From the above configuration, the potential of the midpoint A of the photoconductive cell 9 and the variable resistor R _L is defined by the division ratio of the internal resistance and the variable resistance R _L of Hikarishirubedense le 9, a high low change by brightness of ambient . The variable resistance R _L is preset to a suitable resistance value.

However, when the surroundings are bright and the illuminance is higher than a certain level, the internal resistance of the photoconductive cell 9 is lower, so that the potential of the intermediate point A shifts to a higher potential, and the base terminal of the transistor Q2. Becomes a high potential level, so that the transistor Q2 becomes conductive (ON), and the battery current from the power supply transistor 7 flows through the resistor R4, the transistor Q2 and the resistor R5. By this energization, the base terminal of the transistor Q3 becomes a low potential level close to 0V, so that the transistor Q3 becomes non-conducting (OFF) state. Therefore, the base terminal of the lighting transistor 11 becomes a high potential level and the lighting transistor 11 11 does not reach the conducting state. On the contrary, when the surroundings are dark and the illuminance is lower than a certain level, the internal resistance of the photoconductive cell 9 is higher, so that the potential of the intermediate point A shifts to a lower potential and the base terminal of the transistor Q2 becomes a low potential level. Therefore, the transistor Q2 becomes non-conductive (OFF). Therefore, the power supply current from the power supply transistor 7 flows through the resistor R4, the resistor R6 (capacitor C3) and the resistor R7. At that time, the base terminal of the transistor Q3 becomes a high potential level close to the battery voltage. Therefore, the transistor Q3 becomes conductive (ON), and the battery current from the lighting circuit 3 flows through the resistor R8, the transistor Q3 and the resistor R5. Therefore, by this energization, the base terminal of the lighting transistor 11 becomes a low potential level, and the lighting transistor 11 becomes conductive. As described above, the illuminance / brightness determination circuit 8 determines the lighting transistor 11 from the internal resistance of the photoconductive cell 9 and the voltage division ratio of the variable resistance R _L when the illuminance around the photoconductive cell 9 is below a certain level. It has a circuit configuration that can reach a conductive (ON) state. However, the operation of the illuminance / brightness determination circuit 8 is limited to the time during which the power supply transistor 7 is in the conductive state and the current from the battery 2 is flowing.

The lighting / holding circuit 10 includes, in addition to the lighting transistor 11 of the PNP transistor Q4 connected in series with the light bulb 1 of the lighting circuit 3, a resistor R9 connected between its base terminal and the ground potential. And NPN type transistor Q5 (and resistor R10) and resistor R11 connected between the base terminal of transistor Q5 and lighting circuit 3 and so on. When the conductive state is reached, the current from the battery 2 flows into the light bulb 1 through the collector terminal and the emitter terminal of the lighting transistor 11, and the light bulb 1 is lit. In this case, since the base terminal of the transistor Q5 becomes a high potential level by energization, a part of the current from the battery 2 flowing from the base terminal of the lighting transistor 11 to the transistor Q3 flows through the resistor R9 and the transistor Q5. . As a result, the base terminal of the lighting transistor 11 is always maintained at the low potential level even after it becomes conductive. Therefore, even after the operation of the illuminance / brightness determination circuit 8 ends, the conduction state of the lighting transistor 11 is maintained as it is, the current from the battery 2 flows to the light bulb 1, and the lighting of the light bulb 1 can be continued. .

Therefore, the sensing level of the vibration sensing sensor 5 is set in advance in consideration of the case where the shaking of the earthquake corresponding to the seismic intensity 3 or 4 is applied to the portable light, and thus the present embodiment is set. In the portable light of, for example, when an earthquake with seismic intensity of 3 or 4 actually occurs, the vibration sensor 5 generates a potential change signal corresponding to the shake, and then the conduction time setting circuit 6 causes the potential change signal to be generated. Is converted into a positive high-potential rectangular wave pulse whose pulse width is determined by the time constant Ct.multidot.Rt, and the power supply transistor 7 is turned on by the input of this rectangular wave pulse. However, the time during which it is conducting is only the time corresponding to the pulse width of the rectangular wave pulse. Then, when the power supply transistor 7 becomes conductive like this, when the surroundings are bright and the illuminance is higher than a certain level, the internal resistance of the photoconductive cell 9 is lower and the potential of the intermediate point A is lower. Is at a higher potential, the illuminance / brightness determination circuit 8 brings the lighting transistor 11 into a non-conducting state, so that the light bulb 1 does not light even if vibration occurs. On the contrary, when the surroundings are dark and the illuminance is lower than a certain level, the photoconductive cell 9 has a higher internal resistance and the potential at the intermediate point A is at a lower potential. To bring it into conduction. As a result, the current from the battery 2 flows through the lighting transistor 11 to the light bulb 1, and the light bulb 1 is lit. After that, even after the power supply transistor 7 is turned off and the operation of the illuminance / brightness / darkness determination circuit 8 is completed, the operation of the lighting / holding circuit 10 keeps the lighting transistor 11 conductive. The lighting of the light bulb 1 is continued unless the lighting switch 4 is turned off by the operation of a person.

As described above, the portable light of this embodiment is automatically turned on only when a large vibration (shaking) such as an earthquake occurs when the surroundings are dark such as at night, and the surrounding area is It can be illuminated brightly. In order to perform such an operation, it is necessary to set the sensor operation switch 7 to ON in advance. Further, in this light, the illuminance / brightness determination circuit 8 does not operate under normal conditions, so that wasteful consumption of the batteries 2 can be prevented and its life can be extended.

Furthermore, in the portable light of this embodiment, the battery exhaustion display circuit 12 is provided. That is, the voltage monitoring circuit (IC 1) 13 is connected to the lighting circuit 3, and the light emitting diode 14 and the resistor R12 are connected to the voltage monitoring circuit 13. The voltage monitoring circuit 13 constantly monitors the voltage value between the light bulb 1 and the power supply battery 2, and the voltage value drops to less than the required voltage value (for example, 3 V) due to the consumption of the battery 2 over time. At this time, the current from the battery 2 is sent to the light emitting diode 14. As a result, the light emitting diode 14 lights up, and a person visually recognizes the light emitting diode 14 from outside as shown in FIG. You can know that there is.

Example 2 In addition to the configuration of the portable light of Example 1, the portable light with the automatic lighting function during an earthquake according to this example is pre-tuned to the frequency of radio broadcasting as shown in FIG. The radio unit 24 and the speaker 25 connected to the radio unit 24 are installed in the box-shaped light body 21, and when the vibration-sensitive circuit unit 18 receives a large vibration such as an earthquake, the power source from the battery 2 It is provided with an electric circuit (not shown) that supplies electric current to the radio unit 24 and enables sound waves to be emitted from the speaker 25. Therefore, in the portable light of this embodiment, not only is the light automatically turned on by the occurrence of a night earthquake, but also when an earthquake etc. occurs, radio broadcasting automatically flows from the speaker 25. People can know earthquake information quickly.

[0033]

[Effect of device]

 As described above, according to the present invention, when the surroundings are dark such as at night, and when a large vibration such as an earthquake with a seismic intensity of 3 or more is received, the portable light automatically lights and the surroundings. However, when the surroundings are bright, the effect that the portable light does not light up, in other words, when the surroundings are dark, the effect that the portable light automatically lights up when an earthquake or the like occurs can get. Therefore, the portable light according to the present invention makes it easier and safer for human beings (less likely to be injured) in the event of a disaster at night, especially if an earthquake occurs at night. It has the advantage that it can be sought out, and that evacuation to a safe place can be done more quickly and smoothly. In addition, according to the present invention, the configuration is such that only when a vibration such as an earthquake is received, the electric circuit of the portable light is judged only for a necessary time for the surrounding light and darkness. The illuminance / brightness determination circuit does not operate. Therefore, it is possible to prevent wasteful consumption of the power supply battery and extend its life.

Further, according to an improved aspect of the present invention, when the battery loaded in the portable light is depleted over time, the light emitting diode of the dead battery indicator lights up, and in this case, By visually recognizing the lighting, it is possible to easily know that the battery in the portable light is exhausted and it is time to replace it. Therefore, the portable light according to the present invention avoids the inconvenient situation in which the automatic lighting of the portable light does not work due to the lack of power of the power supply battery at an important time such as when an earthquake actually occurs. It also has the advantage that it can.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a portable light having an automatic lighting function during an earthquake according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a portable light with an automatic lighting function during an earthquake according to the first embodiment.

FIG. 3 is a perspective view showing a vibration sensor provided in the portable light of the embodiment shown in FIG. 2 when the light is in a normal posture (upright posture).

FIG. 4 is a perspective view showing a vibration sensor included in the portable light of the embodiment shown in FIG. 2 when the light is in an unusual posture, for example, in a tilted posture.

FIG. 5 is a perspective view showing a portable light with an automatic lighting function during an earthquake according to a second embodiment.

[Explanation of symbols]

 1 Light Bulb 2 Battery (Battery) 3 Lighting Circuit 5 Vibration Sensor 6 Conduction Time Setting Circuit 7 Power Supply Transistor 8 Illumination Brightness / Darkness Judgment Circuit 9 Photoconductive Cell 10 Lighting / Holding Circuit 11 Lighting Transistor 12 Dead Battery Display Circuit 13 Voltage Monitoring Circuit 14 Light emitting diode 16 Ring 17 Pendulum

Claims (4)

[Scope of utility model registration request] 1. A vibration sensing sensor which is incorporated in a lighting circuit including a light bulb of a portable light and a battery of a power source and which generates a signal whose potential changes by vibration, and the potential change signal which is connected to the vibration sensing sensor. A conduction time setting circuit for converting into a positive rectangular wave pulse determined by a predetermined time constant, and a base terminal connected in parallel with the light bulb of the lighting circuit and the conduction time setting circuit. A power supply transistor that is turned on by the input of a wave pulse, a photoconductive cell and a resistor are connected in series with the power supply transistor, and an intermediate point between them is connected to a lighting transistor. From the partial pressure ratio of
When the illuminance around the photoconductive cell is below a certain level, an illumination brightness determination circuit for bringing the lighting transistor into a conductive state, and the lighting transistor is connected in series with a light bulb of the lighting circuit, A portable light with an automatic lighting function during an earthquake, which includes a lighting / holding circuit that maintains the conductive state of the lighting transistor when the conductive state is reached. 2. The photoconductive cell is a CdS cell or CdS.
The portable light with an automatic lighting function during an earthquake according to claim 1, which is an e-cell. 3. The vibration sensor comprises a ring of a conductor and a pendulum of the conductor suspended through the ring so as to be swingable, and one of the ring and the pendulum. The portable light with automatic earthquake lighting function according to claim 1 or 2, wherein is connected to a power battery of the light and the other is grounded. 4. A voltage monitoring circuit connected to the lighting circuit to monitor the voltage of a power supply battery, and a light emitting diode connected to the voltage monitoring circuit and lit when the voltage value drops below a predetermined value. The portable light with an automatic lighting function during an earthquake according to any one of claims 1 to 3, further comprising a battery dead display means.