JP2003007479A - Light source drive - Google Patents

Abstract

(57) [Problem] To provide a lighting device which can perform drip-proof treatment regardless of a use place and reproduces a unique fluctuation of a candle flame. An electric signal synchronized with a randomly generated sound is transmitted and amplified using a sound collector such as a condenser microphone. In addition, a continuous electric signal having a constant waveform is transmitted, the two types of electric signals are compared by a comparator, and a pulse signal based on the comparison result is generated. Further, the light source is driven so as to be tuned to the pulse waveform using the field effect transistor.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used at an event such as a festival or a concert, or indoors.
The present invention relates to a light source driving device having a function of generating light and dark by sensing sound. Heretofore, it is generally known that the unique fluctuation effect of a candle flame gives a feeling of openness, healing, or a comfortable feeling to human beings. . Therefore, with the aim of obtaining these comfortable feelings, attempts have been made to reproduce the unique fluctuations of the candle flame in light sources such as incandescent bulbs and LEDs, and to obtain the same feeling as when using a candle. I have. For example, Japanese Patent Application Laid-Open No. Hei 6-52709 discloses a long cylindrical tube in which an iron weight is attached to a lower part of a light bulb shaped like a candle flame, and an electromagnet and a transmission circuit for continuously exciting the electromagnet are installed. A decoration in which a light bulb is attached to a hollow body so that the iron weight is set in the magnetic field of the electromagnet, and the light bulb itself is mechanically operated to reproduce the unique fluctuation of a candle flame in the light of the bulb. A lighting fixture is disclosed. Japanese Patent Application Laid-Open No. 2-44693 discloses that
Utilize minute voltage fluctuations at both ends of the resistor,
A method is disclosed in which data having 1 / f fluctuation is stored in a ROM in advance, and this data is read to transmit a fluctuation signal. Japanese Patent Application Laid-Open No. 7-14680 discloses that
In order to improve the fact that 1 / f fluctuation cannot be realized due to this time lag in a heating light bulb or the like in which a time lag exists after the switch is turned on and off, the drive signal is divided. An illumination device is disclosed in which signals are separately delayed and then combined to emit light. Further, Japanese Patent Application Laid-Open No. 9-326299 discloses a method in which a zener diode having a characteristic of generating a noise signal corresponding to the wind under the influence of wind is used, and this noise signal is supplied to an amplifier circuit. Aside from this electric signal, a reference signal is generated in a reference signal generation circuit, and the reference signal is compared with the signal amplified by the amplification circuit to generate a pulse signal. A light source driving device and a fluctuation signal generating device for driving a light source in synchronization with the above waveform are disclosed. [0007] In the decorative lamp disclosed in Japanese Patent Application Laid-Open No. 6-52709, the light bulb is vibrated mechanically, but the brightness of the light bulb itself remains constant. However, there is a problem that unnaturalness exists in comparison with the fluctuation of candle flame. Further, in the fluctuation illumination method disclosed in Japanese Patent Application Laid-Open No. 2-44693 and the illumination device disclosed in Japanese Patent Application Laid-Open No. Hei 7-14680 which improved the method, fluctuation of the flame of a candle is realized. Although,
This is a fluctuation of a fixed pattern, and does not reproduce the influence on the fluctuation of the flame caused by an external factor caused by, for example, wind, which occurs at random. Further, according to the light source driving device and the fluctuation signal generating device disclosed in Japanese Patent Application Laid-Open No. 9-326299, in order to generate the fluctuation, a housing including the light source driving device and the fluctuation signal generating device is provided. It is necessary to send air directly to the Zener diode by installing it outside or mounting a Zener diode outside the housing or by installing a ventilation hole on the front of the housing, which limits the use and location There is a problem that it is impossible to take a drip-proof treatment structurally. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a light source driving device capable of adopting a drip-proof structure while reproducing a unique fluctuation effect of a candle flame in a light source. It is intended to provide. [0011] In order to achieve the above-mentioned object, a light source driving device according to the present invention senses a sound wave and transmits an electric signal corresponding to the sound wave. A sound signal and a noise signal transmission circuit including an amplifier for amplifying an electric signal transmitted from the sound collector;
A constant signal, and a reference signal transmission circuit that transmits an electric signal that is also a continuous waveform, the electric signal transmitted from the noise signal transmission circuit, and comparing the electric signal transmitted from the reference signal transmission circuit, A comparison circuit for outputting an electric signal corresponding to the comparison result, and a drive circuit for driving a light source based on the electric signal output from the comparison circuit are provided. According to the present invention, the noise signal transmission circuit comprises a sound collector provided with, for example, a condenser microphone or an electromagnetic microphone, and an amplifier provided with a filter function, and an output terminal is connected to the comparison circuit. . The sound that is randomly generated outside is converted into an electric signal by the sound collector and then amplified by an amplifier, so that an electric signal corresponding to the sound is output to the input terminal of the comparison circuit. Further, an AC power supply is connected to an input terminal of the reference signal transmitting circuit, and an electric signal of a continuous constant waveform such as a triangular waveform or a sawtooth waveform is transmitted. The reference signal transmission circuit is connected to another input terminal of the comparison circuit, which is different from the input terminal connected to the noise signal transmission circuit, and receives an electric signal transmitted from the reference signal transmission circuit. . The electric signal (comparison signal) transmitted from the noise signal transmission circuit and the electric signal (reference signal) transmitted from the reference signal transmission circuit are compared by a comparison circuit using, for example, a comparator. An electric signal (drive signal) based on the comparison is transmitted from the output terminal. An output terminal of the comparison circuit is connected to an input terminal of the drive circuit. For example, the drive circuit allows a light source to pass a current when the signal is an electric signal having a certain output or more. In the case of a signal, a field effect transistor or the like having the property of restricting the flow of current is used. The electric signal (drive signal) is input to the drive circuit, and the light source is driven so as to be synchronized with the electric signal (drive signal), whereby the light source is provided with light and dark, that is, fluctuation. As described above, in order to impart the fluctuation, the sound may be sensed by the sound collector, so that the sound collecting device is not limited to the use place. In addition, since the source of the fluctuation is the above-mentioned sound collector such as a condenser microphone or an electromagnetic microphone, even if the entire device is included in the housing, the sound wave passes through the housing, so that the light source fluctuates. Can be generated, and thus a drip-proof treatment can be performed. Next, specific embodiments of a light source driving device according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a light source driving device according to an embodiment of the present invention, and FIG. 2 is a specific circuit diagram. The block diagram and the circuit diagram correspond to each other. The light source driving device according to the present embodiment includes a comparator 1, a driving circuit 2, a light source 3, a noise signal transmitting circuit 4 having a function of transmitting a comparison signal, and a reference signal transmitting function having a function of generating a reference signal. It is constituted by a circuit 5. The comparator 1 has a positive input terminal, a negative input terminal, and an output terminal. The output terminal of the noise signal transmission circuit 4 is connected to the positive input terminal, and the output terminal of the reference signal transmission circuit 5 is connected to the negative input terminal. The output terminal is connected to an input section of the drive circuit 2, and a light source is connected to an output section of the drive circuit 2. The comparator 1 has a positive and a negative input terminal and an output terminal as described above, compares the voltage levels of the electric signals input to each of them, and outputs a pulse waveform from the output terminal based on the comparison result. It has the function of transmitting electric signals. Specifically, when the voltage of the electric signal input from the positive terminal is higher than the voltage of the electric signal input from the negative terminal, from the output terminal,
After rapidly rising to the saturation voltage of the comparator, a high-level, steady-state electrical signal is rapidly reduced in the opposite case, and then a low-level, steady-state electrical signal is emitted. Unless the comparison result is exchanged, a steady electric signal other than the rising signal is continuously generated from the output signal. In the case where the waveforms of the two types of input signals cross each other, as shown in FIG. 2, each time the electric signal (a) and the electric signal (b) cross, the comparison result of the comparator 1 is switched. A stationary signal having a high level and a stationary signal having a low level are generated alternately, and an electric signal having a pulse waveform is transmitted from an output terminal. In FIG. 2, the electric signal (a) is input to the positive input terminal of the comparator, and the electric signal (b) is input to the negative input terminal. In the present embodiment, the comparison signal is input to a positive input terminal and the reference signal is input to a negative input signal, and an electric signal having a pulse waveform corresponding to these electric signals is output. The drive circuit 2 is composed of the field effect transistor (FET) 11 and a resistor 12. The FET 11 plays the role of a gate. When the input signal is at a higher level than the reference value of the FET 11, the gate is opened and a current flows to the output of the FET 11, but when the input signal is at a low level, the gate becomes narrower. It has the characteristic that the flow of current is restricted due to the state. In the present embodiment, this reference value is set between the saturation voltages of the comparator 1. By doing so, the gate is open when the level is high, and the gate is narrow when the level is low. Next, conditions to be satisfied by the electric signal input to the comparator 1 in giving the fluctuation to the light source 3 will be described. If the two types of electrical signals input to the comparator 1 are electrical signals having extremely different voltages, the output pulse signal is extremely biased to either a high level or a low level. However, when the light source 3 is driven by this pulse signal, the light source 3 can only be seen to have a constant brightness, which is not suitable for providing the light source with fluctuations. Therefore, in order to impart fluctuation to the light source 3, it is necessary that the average of each input signal is the same level or close to it. In this embodiment, the reference signal is set to have a larger amplitude than the comparison signal while satisfying this condition. When the frequency of the comparison signal is extremely lower than the frequency of the reference signal, the comparator 1 outputs an electric signal having almost no change and a seemingly constant pulse waveform. Even if the light source is driven in accordance with such a pulse waveform, it is not preferable because fluctuations cannot be recognized by human eyes as if light and dark at a constant cycle are continuous. In the case of a comparison signal that vibrates at an extremely high frequency compared to the reference signal, a pulse wave with an extremely short wavelength and a short interval is generated. In this case, the light source is driven by the human eye with constant brightness. It is not preferable because it only looks like you are doing it. Therefore, it is necessary to use only waves having a certain range of frequencies and remove electric signals of other frequencies. In the present embodiment, such a condition is satisfied, and the frequency of the reference signal vibrates at a higher frequency than the frequency of the comparison signal. Next, a method of transmitting the comparison signal and the reference signal input to the input terminal of the comparator 1 will be described. The noise signal transmitting circuit 4 includes a sound collector 21
And a band filter / amplifier 22 having a function of attenuating an electric signal other than a specific frequency and amplifying the amplitude of the other electric signal, and a function of adjusting an amplification gain in addition to the function of the band filter / amplifier 22 And a band-pass filter / gain control amplifier 23 having The output terminal of the sound collector is a bandpass filter.
The output terminal of the bandpass filter / amplifier 22 is connected to the input terminal of the amplifier 12 and the input terminal of the bandpass filter / gain control amplifier 23, respectively.
The output terminal of the band-pass filter / gain control amplifier 23 is connected to the plus input terminal of the comparator 1. The sound collector 21 includes a condenser microphone 4
1, a resistor 42, capacitors 43 and 44, a polar capacitor 45 and a Zener diode 46. The condenser microphone 41 includes a diaphragm serving as a variable electrode and a back plate serving as a fixed electrode. The capacitor 44, the polar capacitor 45, and the zener diode 46 are used as a polarization voltage applied between the pole plates of the condenser microphone 41. When a resistor 42 and a capacitor 43 are attached as shown in FIG. 2 and the diaphragm of the condenser microphone 41 senses a sound wave in a state where a voltage is applied between the capacitors (variable electrode plate-fixed electrode plate), this sound is generated. An electric signal having the same waveform as is transmitted. This electric signal is divided into two stages and amplified by the band-pass filter / amplifier 22 and the band-pass filter gain control amplifier 23. The band-pass filter / amplifier 22 comprises an OP amplifier 51, resistors 52, 53, 54, 55, a polarized capacitor 56, and capacitors 57, 58.
The range of the frequency of the electric signal to be removed can be determined by changing the polarized capacitors 56 and 57, and the gain of the amplifier (band filter amplifier 22) is determined by the resistors 64 and 65. The band-pass filter / gain control amplifier 23 comprises an OP amplifier 61, a polar capacitor 62, capacitors 63 and 69, resistors 64 and 67, a variable resistor 65, and diodes 66 and 68. And the capacitor 63 have the same function as the capacitor in the bandpass filter / amplifier 22. Further, the gain of amplification can be adjusted by operating the variable resistor 64 and changing the value of the resistor. The gain is finely adjusted using the variable resistor 64 so as to satisfy the condition of the signal. Next, the waveform of the electric signal is adjusted by the resistor 67, the diode 68, and the capacitor 69, and the comparison signal output from the electric signal is output to the plus input terminal of the comparator. On the other hand, the reference signal transmitting circuit 5
The rectifier circuit 31 has an input terminal connected to an AC power supply 34, an output terminal connected to an input terminal of the amplifier 32, and an output terminal of the amplifier 32 having a waveform conversion circuit 33. It is connected to the input terminal of the feedback circuit 33. The output terminal of the waveform feedback circuit 33 is connected to the negative input terminal of the comparator 1. In the present embodiment, the AC power supply 34
100 commercial power supplies are used. The voltage transmitted from this AC power supply is an electric signal having a sine waveform. The rectifier circuit 31 is composed of a fuse of 1 A and a diode bridge 71.
Rectified and output to the amplifier 32. The amplifier 32 comprises a comparator 81, resistors, 82, 83, 84, 85, 86, a Zener diode 87, and a polar capacitor 88.
Here, the voltage of the input signal is adjusted by the resistors 92, 93, 94, and 95 so that the comparator 81 is prevented from being overloaded and a pulse signal is transmitted from the comparator 91. Also, a resistor 86, a Zener diode 87,
The polar capacitor 88 functions as a constant voltage power supply for supplying a voltage to the OP amplifier 91. The wavemeter conversion circuit 33 includes a resistor 91, a diode 92, and a capacitor 93, and has a function of converting the waveform of an electric signal input from the amplifier 32. The waveform of the reference signal output from the reference signal transmission circuit 5 is
A triangular waveform, a sawtooth waveform, or the like is preferable. In the present embodiment, an electric signal having a sawtooth waveform is output to the minus input terminal of the comparator 1 as a reference signal via the amplifier 32 and the waveform conversion circuit 33. The comparison signal and the reference signal are input to the input terminal of the comparator 1. However, since the reference signal is input to the negative input terminal, a silent state, that is, the condenser microphone in the noise signal transmission circuit 4 emits a sound wave. If no sensing is performed, the comparison signal is not transmitted, so that the electric signal transmitted from the output terminal of the comparator 1 is a stationary electric signal having a low level voltage except for the rising signal. In this case, the FET 11 of the driving circuit 2 is always in a narrow state, and the current flowing to the light source 3 attached to the output unit is limited, so that the light source 3 is always in a dark and glowing state. In this state, when a sound is generated, the sound wave vibrates the diaphragm of the condenser microphone 41, the capacitance of the capacitor changes accordingly, and an electric signal based on the sound wave is generated. The electric signal is amplified by the band-pass filter / amplifier 22 and the band-pass filter / gain control amplifier 23 as described above, a wave having an inappropriate frequency is removed, and the electric signal is rectified by the waveform conversion circuit.
The signal is transmitted to the plus input terminal of the comparator 1 as a comparison signal. Next, an electrical signal having a pulse waveform corresponding to the comparison result between the reference signal input to the minus input terminal of the comparator 1 and the comparison signal is output from the output terminal of the comparator 1. The FET 11 in the driving circuit 2 passes or restricts the current flowing to the light source 3 as it is in accordance with the pulse waveform.
Of light, that is, fluctuation occurs. The board on which these circuits are mounted is contained in a housing, and only the light source is mounted outside the housing. Further, a light bulb of about 10 to 20 W is used as the light source 3. Further, since the wind can be converted into sound by installing a whistle, a pipe, or the like, the influence of the wind can be given to the light source 3, and the light source 3 generates the fluctuation of the candle flame. Can be. In this embodiment, the light source driving device which emits steady and dark light in a silent state and emits a flicker by emitting bright light in a sound state has been described. 5 can be reversed and attached to the input terminal of the comparator 1. With this configuration, it is possible to provide a light source driving device that emits steady bright light in a silent state and darkens in a sound state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a light source driving device according to an embodiment. FIG. 1 is a circuit diagram of a light source driving device according to an embodiment. FIG. 3 is a diagram showing an input signal and an output signal in a comparator. [Description of Signs] 1 Comparator 2 Drive circuit 3 Light source 4 Noise signal transmission circuit 5 Reference signal transmission circuit 11 Field effect transistor (FET) 12 Resistor 21 Sound collector 22 Band filter / amplifier 23 Band filter / gain control amplifier 31 Rectifier circuit 32 Amplifier 33 Waveform conversion circuit 34 AC power supply 41, 42 Resistance 43, 44 Capacitor 45 Capacitor (polarity) 46 Zener diode 51 OP amplifier 52, 53, 54, 55 Resistance 56 Capacitor (polarity) 57, 58 Capacitor 61 OP amplifier 62 Polarized capacitors 63, 69 Capacitors 64, 67 Resistance 65 Variable resistance 66, 68 Diode 71 Diode bridge 81 Comparator 82, 83, 84, 85, 86 Resistance 87 Zener diode 88 Capacitor (polar) 91 Resistance 2 diode 93 capacitor

Claims (1)

Claims 1. A noise collector comprising: a sound collector for sensing a sound wave and transmitting an electric signal corresponding to the sound wave; and an amplifier for amplifying the electric signal transmitted from the sound collector. A signal transmitting circuit, a reference signal transmitting circuit that transmits an electric signal that is also a constant waveform and a continuous waveform, an electric signal transmitted from the noise signal transmitting circuit, and an electric signal transmitted from the reference signal transmitting circuit. And a driving circuit for driving the light source based on the electric signal output from the comparing circuit, and a driving circuit for driving the light source based on the electric signal output from the comparing circuit.