JP2004289518A - Optical signal switch device and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical signal switch device which can prevent the load from malfunctioning owing to higher harmonics and whose circuit constitution can be simplified. <P>SOLUTION: When a user holds a hand up to reflect the optical signal sent from a light projecting device 12, the reflected wave is received by a light receiving device 16 and a filter circuit 17 removes the noise included in the reflected wave received by the light receiving device 16; and an amplifier circuit 19 amplifies the reflected wave whose noise is removed, the reflected wave amplified by the amplifier circuit 19 is passed through a gate circuit 20 when a pulse signal from the light projecting device 12 is inputted to the light receiving device, and the reflected wave after passing through the gate circuit 20 has its waveform shaped in a waveform shaping circuit 21. An output circuit 22 inverts its output level each time the waveform-shaped reflected wave is inputted to drive a driving circuit 23, thereby outputting a turn-off signal for the lamp 39 to a lighting fixture 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical signal type switch device and an illumination device for switching a load in response to a reflected wave of an optical signal.
[0002]
2. Description of the Related Art A light emitter for emitting an optical signal and a light receiver for receiving a reflected wave thereof are incorporated in a main body of a lighting device. For example, when a person holds his hand, an optical signal from the light emitter is reflected by hand. In some cases, the reflected wave is received by a light receiver to turn on / off a lamp as a load.
[0003]
In such a lighting device, the signal from the light receiver is amplified by the amplifying unit, the sensitivity is adjusted by the sensitivity adjusting unit, the noise is removed by the noise removing unit, the waveform is shaped by the waveform shaping unit, and then the latch unit is The signal is held, and the driver outputs to the lighting circuit of the lighting device that the person has turned on / off the light. Then, a blinking operation is performed only after a signal from the photodetector continues for a certain period of time so that a malfunction does not occur due to unconscious movement of a person (for example, see Patent Document 1).
[0004]
[Patent Document 1] JP-A-3-280398 (FIGS. 1 and 8)
[0005]
However, in such a lighting device, after the signal from the light receiver is amplified by the amplifying unit, the sensitivity is adjusted by the sensitivity adjusting unit, and the noise is removed by the noise removing unit. Therefore, when the input to the light receiver is large, the amplifier may be saturated and the output may be distorted. In such a case, proper sensitivity adjustment cannot be performed even if sensitivity is adjusted by the impression adjustment unit at a stage subsequent to the amplification unit. In addition, not only the reflected wave from the projector but also the light of the lamp itself is input to the receiver, so if the output of the amplifier is distorted, harmonics of the lamp light will be generated and the frequency of the optical signal from the projector will be increased. May match.
[0006]
For example, assuming that the frequency of the optical signal of the projector is 2 kHz and the lighting frequency of the lamp is 50 Hz, the lamp light of 50 Hz is distorted due to saturation of the amplification unit, and a harmonic of 2 × 40 times of 50 Hz is generated. However, the noise removing unit cannot remove the harmonic 2 kHz of the lamp light. As described above, when the harmonic generated due to the distortion of the signal waveform due to the saturation of the amplification unit matches the frequency of the optical signal from the projector, the noise cannot be removed by the noise removal unit. May be caused.
[0007]
Further, the waveform shaping section is constituted by a D flip-flop, and the synchronization of the optical signal from the light emitter and the reflected wave from the light receiver is achieved by a digital signal, so that the circuit configuration becomes complicated.
[0008]
An object of the present invention is to provide an optical signal switch device and a lighting device that can prevent a malfunction of a load due to a harmonic and can simplify a circuit configuration.
[0009]
According to the first aspect of the present invention, there is provided an optical signal switch device for transmitting a light signal of a fixed level at a fixed frequency based on a pulse signal of a fixed frequency; A light receiver for receiving a reflected wave of an emitted optical signal from an object; a filter circuit for removing noise contained in the reflected wave received by the light receiver; an amplifier for amplifying the reflected wave from which noise has been removed by the filter circuit An amplifying circuit that performs; a gate circuit that passes a reflected wave amplified by the amplifying circuit when a pulse signal is input from the light projector; a waveform shaping circuit that shapes a reflected wave that has passed through the gate circuit; An output circuit for inverting the output level each time a reflected wave whose waveform is shaped by the waveform shaping circuit is input; and a drive for outputting a load on / off signal based on an output signal of the output circuit. Characterized by comprising a; and road.
[0010]
In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified. The optical signal type switch device switches the load on and off by a reflected wave of an optical signal from the light emitter and reflected by an object. When a person holds his hand over the light emitter, the load on / off signal, that is, operation / non-operation. It outputs an operation control signal. The load is a lamp of a lighting device, a washstand, a flush of a toilet, or the like, which is a target of operation / non-operation control.
[0011]
The projector emits an optical signal of a certain level at a certain frequency.For example, it is composed of an infrared light emitting diode and a transmitter, and the infrared light emitting diode emits a light signal of a certain level with a pulse signal of a certain frequency of an oscillator. Output. The light receiver receives the reflected wave of the optical signal transmitted from the light emitter from the object, and is constituted by, for example, a phototransistor or a photodiode, and operates when receiving the optical signal to convert it into an electric signal.
[0012]
The filter circuit is a band-pass filter that passes a signal having the same frequency as a fixed frequency of the oscillator, and passes only a signal of a reflected wave reflected by an object. Thereby, noise included in the reflected wave received by the light receiver is removed. The amplifier circuit amplifies the reflected wave from which noise has been removed by the filter circuit. For example, an operational amplifier circuit (OP amplifier) is used.
[0013]
The gate circuit allows the reflected wave amplified by the amplifier circuit to pass when the pulse signal from the projector is input, and has, for example, a transistor that conducts when the pulse signal from the projector is input. And a circuit comprising a transistor and a capacitor for shaping the waveform of the reflected wave amplified by the amplifier circuit when the transistor is conducting. For example, it operates to maintain the low level while the reflected wave is being input to the light receiver, and operates to maintain the high level while the reflected wave is not being input to the light receiver. Thereby, the analog signal is converted into the digital signal.
[0014]
The waveform shaping circuit further shapes the waveform of the signal indicating the reflected wave that has passed through the gate circuit, and outputs a low-level signal while the reflected wave is being input to the light receiver, and the reflected wave is input to the light receiver. While not being performed, a high-level signal is output.
[0015]
The output circuit inverts the output level each time a signal indicating a reflected wave whose waveform has been shaped by the waveform shaping circuit is input. For example, the output circuit is configured by a T flip-flop, and the output signal of the waveform shaping circuit is at a low level. The falling point (the point at which the reflected wave is input to the light receiver) is detected, and the output level is inverted each time. When a high-level signal is output when a reflected wave is input to the photodetector, a low-level signal is output when a reflected wave is input to the next photodetector, and at the next time, the high-level signal is output. A signal is output, and similarly, a high-level signal and a low-level signal are output alternately when a reflected wave is input to the photodetector.
[0016]
The drive circuit outputs a load ON / OFF command signal based on an output signal of the output circuit. When a high level signal is input from the output circuit, the drive circuit outputs a load operation control signal. When a low level signal is input, a non-operation control signal which is a load switching signal is output.
[0017]
According to the present invention, the noise contained in the signal from the light receiver is first removed by the filter circuit, and then amplified by the amplifier circuit, so that the harmonic component due to the distortion of the output of the amplifier circuit is output from the optical signal from the projector. , And malfunction can be prevented. Also, the gate circuit allows the reflected wave amplified by the amplifier circuit to pass when a pulse signal from the projector is input, and converts the analog signal to a digital signal by shaping the waveform of the reflected wave that passed through the gate circuit. The configuration is simplified.
[0018]
According to a second aspect of the present invention, in the optical signal switch device according to the first aspect, a sensitivity adjustment circuit for adjusting the reception sensitivity of the reflected wave is provided between the filter circuit and the amplification circuit. It is characterized by the following.
[0019]
According to the present invention, the sensitivity adjustment circuit for adjusting the reception sensitivity of the reflected wave is provided before the amplification circuit, so that the sensitivity adjustment can be performed before amplification. Therefore, simple adjustment can be properly performed.
[0020]
According to a third aspect of the present invention, in the optical signal switch device according to the first or second aspect, the output circuit outputs a load-off signal in an initial state when power is turned on. And
[0021]
According to the present invention, when the power is turned on, the control starts from a non-operation state of the load. The output circuit is configured to output a low level signal when the power is turned on. As a result, the load is forcibly disabled.
[0022]
According to the present invention, the optical signal type switch device puts the load into an inoperative state when the power is turned on, so that the light receiver operates after receiving the reflected wave from the light emitter after the power is turned on. Use can be started with the same feeling as an on / off switch.
[0023]
According to a fourth aspect of the present invention, there is provided a lighting device including the optical signal switch device according to any one of the first to third aspects, a lamp, and a lighting device for lighting the lamp. And a built-in lighting fixture body. According to the present invention, it is possible to provide a lighting device having any of the effects described in claims 1 to 3.
[0024]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a block diagram of an optical signal type switch device 11 according to a first embodiment of the present invention. The first embodiment shows a case where the load is a lamp. Hereinafter, a case where the lamp is turned on and off will be described. The light projector 12 includes an oscillator 13 for generating a pulse signal of a constant frequency and an infrared light emitting diode 14 for outputting a light signal of a constant level. The infrared light emitting diode 14 outputs a constant frequency (for example, 12 kHz) of the oscillator 13. Is output. The optical signal hits an object 15, for example, a human hand, and the reflected wave is received by the light receiver 16. The light receiver is configured by, for example, a phototransistor or a photodiode, and converts an optical signal into an electric signal.
[0025]
The reflected wave received by the light receiver 16 is input to the filter circuit 17 of the optical signal type switch device 11, where noise is removed and only a signal having the same frequency (12 kHz) as the constant frequency of the oscillator 14 is passed. That is, when a person holds his hand over the light projector 12, the reflected wave of the light signal from the light receiver 16 is input to the filter circuit 17 of the light signal type switch device 11, the noise is removed, and the sensitivity adjustment circuit 18 is removed. The signal is input to the amplifier circuit 19 via the input terminal. The sensitivity adjustment circuit 18 adjusts the detection sensitivity of the reflected wave from the light receiver 16.
[0026]
The amplification circuit 19 amplifies the reflected wave whose noise has been removed by the filter circuit 17 and the sensitivity of which has been adjusted by the sensitivity adjustment circuit 18. The amplified reflected wave is input to the gate circuit 20. The pulse signal from the light projector 12 is also input to the gate circuit 20. When the pulse signal from the light projector 12 is input, the reflected wave amplified by the amplifier circuit 19 is passed to the waveform shaping circuit 21.
[0027]
FIG. 2 is a circuit diagram showing an example of the gate circuit 20. The output signal (reflected wave) of the amplifier circuit 19 is input to the transistor Tr1 via a parallel circuit of the diode D1 and the resistor R1. Control power is supplied to the collector of the transistor Tr1 via the resistor R2, and a capacitor C1 is connected between the collector and the emitter. The transistor Tr1 is connected in series to a transistor Tr2 that conducts when a pulse signal from the projector 12 is input via the resistor R3. A capacitor C2 is connected in parallel to a series circuit of the transistors Tr1 and Tr2. ing.
[0028]
That is, when the transistor Tr2 is conducting, the transistor Tr1 amplifies and outputs the reflected wave amplified by the amplifier circuit 19, and shapes the waveform by the capacitor C2. That is, the transistor Tr1 and the capacitor C2 operate to maintain the low level while the reflected wave is being input, and operate to maintain the high level while the reflected wave is not being input to the light receiver 16. And convert an analog signal to a digital signal.
[0029]
The waveform shaping circuit 21 further shapes the waveform of the signal indicating the reflected wave passing through the gate circuit 20. A low-level signal is output while the reflected wave is being input to the light receiver 16, and a high-level signal is output while the reflected wave is not being input to the light receiver 16. The output circuit 22 detects a falling edge of a signal indicating the reflected wave whose waveform has been shaped by the waveform shaping circuit 21, detects a point in time when the output signal of the waveform shaping circuit 21 falls to the low level, and each time the output level is detected. Is inverted. As a result, when a reflected wave is first input to the light receiver 16, a high-level signal is output. In this state, when a reflected wave is next input to the light receiver 16, a low-level signal is output.
[0030]
The drive circuit 23 outputs a lighting signal of the lamp 39 to the lighting device 24 when a high level signal is input from the output circuit 22, and outputs a lamp signal to the lighting device 24 when a low level signal is input from the output circuit 22. The signal 39 is turned off. Thus, when a person first puts his hand on the light projector 12, a lighting signal is output to the lighting device 24, and in this state, when a person next puts his hand on the light projector 12, the lighting device 24 is turned on. A turn-off signal is output.
[0031]
FIG. 3 is a term chart showing the operation of the optical signal type switch device 11. Now, suppose that a person first puts his hand on the light projector 12 at time t1. When a person holds his hand over the light projector 12, the reflected wave of the light projector 12 is received by the light receiver 16 and input to the amplifier circuit 19 via the filter circuit 17 and the sensitivity adjustment circuit 18 of the optical signal type switch device 11. The output signal of the amplifier circuit 19 is a signal of a constant frequency determined by the oscillator 13. The signal amplified by the amplifier circuit 19 is input to the transistor Tr1 of the gate circuit 20. On the other hand, the transistor Tr2 of the gate circuit 20 conducts when the pulse signal from the light projector 12 is input, so that the transistor Tr1 operates and the collector current flows while the transistor Tr2 is conducting.
[0032]
That is, when the transistor Tr1 operates, a collector current flows through the transistor Tr1, and the output to the capacitor C2 goes low with a delay. Therefore, at time t2, the output signal of the gate circuit 20 goes low. After that, when the transistor Tr2 becomes non-conductive, the transistor Tr1 also becomes inactive, the capacitor C2 starts charging and the potential starts to rise, but before the potential has completely risen, the pulse signal from the projector 12 is turned on. Is turned on, the transistor Tr1 also operates, and the potential of the capacitor C2 becomes low level. This operation is repeatedly performed while a person is holding his hand over the projector 12.
[0033]
Then, when the person stops holding the hand over the projector 12 at the time point t3, the output signal of the amplifier circuit 19 disappears, the transistor Tr1 becomes inactive, and the potential of the capacitor C2 becomes high level with a delay, and at the time point t4. The output signal of the gate circuit 20 becomes a high level and maintains the high level.
[0034]
In this state, at time t5, when a person again puts his hand on the light emitter 12, the collector current flows through the transistor Tr1, and the output to the capacitor C2 becomes low level with a delay. At time t6, the gate circuit 20 The output signal becomes low level. Thereafter, when the transistor Tr2 becomes non-conductive, the transistor Tr1 also becomes inactive, the capacitor C2 starts charging, the potential starts to rise, and the pulse signal from the light emitter 12 is turned on before the potential has completely risen. The transistor Tr1 becomes conductive, and the potential of the capacitor C2 becomes low level.
[0035]
Then, when the person stops holding the hand over the projector 12 at the time point t7, the output signal of the amplifier circuit 19 disappears, the transistor Tr1 becomes inactive, and the potential of the capacitor C2 becomes high level with a delay, and at the time point t8. The output signal of the gate circuit 20 becomes a high level and maintains the high level.
[0036]
The waveform shaping circuit 21 outputs a low level when the output signal of the gate circuit 20 goes low, and outputs a high level when the output signal of the gate circuit 20 goes high. That is, when a person holds his hand over the light projector 12, it outputs a low level with a time delay, and when a person stops holding his hand over the light projector 12, it outputs a high level with a time delay.
[0037]
The output circuit 22 detects the fall of the output signal of the waveform shaping circuit 21 and inverts the output level each time. The initial state of the output circuit 22 is set to a low level as described later. Now, before time t2 is the initial state. In this state, if the output signal of the waveform shaping circuit 21 falls to the low level at the time t2, the signal is inverted from the low level to the high level signal at the time t2. Then, the state (high level) is maintained until the next output signal of the waveform shaping circuit 21 falls. Next, when the output signal of the waveform shaping circuit 21 falls at the time point t6, the signal is inverted from a high level to a low level signal. That is, the output circuit 22 outputs a signal that holds the time from when a person holds his hand over the projector 12 to when he or she next holds his hand.
[0038]
The drive circuit 23 outputs a lamp lighting signal to the lighting device 24 when a high-level signal is input from the output circuit 22, and turns off the lamp 39 to the lighting device 24 when a low-level signal is input from the output circuit 22. Is output. As a result, the lamp 39 is turned on for a period of time from when a person holds his hand over the projector 12 to when he or she next holds his hand.
[0039]
FIG. 4 is a circuit diagram showing an example of the output circuit 22 and the drive circuit 23. The output circuit 22 is connected to a control power supply via a resistor R4, and receives an output signal of the waveform shaping circuit 21 via a capacitor C3 connected to the resistor R4. The signal from the waveform shaping circuit 21 is input to the knot circuits 25A and 25B through the diodes D2A and D2B and R8A and R8B, and the output signal is sent to the own knot circuits 25A and 25B via the resistors R5A and R5B and the resistors R7A and R7B. Will return. Further, the current returns to the other knot circuits 25B and 25A via the resistors R6A and R6B and the capacitors C4A and C4B.
[0040]
The capacitors C5A and 5B adjust the rise time of the input signal to the knot circuits 25A and 25B. In the first embodiment, the capacity of the capacitor C5A is selected to be larger than the capacity of the capacitor C5B. As a result, the rise of the capacitor C5A is later than the rise of the capacitor C5B, and the rise of the capacitor C5B is earlier.
[0041]
Therefore, when the power is turned on and a voltage is input from the control power supply via the resistor R4, the rise of the capacitor C5B is faster, so that the knot circuit 25B operates faster and sends a low-level signal to the drive circuit 23. Will be output. Thus, the initial state of the output circuit 22 when the power is turned on is set to the low level.
[0042]
In the drive circuit 23, an output signal from the output circuit 22 is input to the base of the transistor Tr3 via the resistor R9. The transistor Tr3 conducts when the output signal from the output circuit 22 is at a high level, operates the drive relay 26 connected in parallel with the diode D3, and outputs a lighting signal to the lighting device 24. On the other hand, when the output signal from the output circuit 22 is at the low level, the transistor Tr3 is non-conductive, so that the drive relay 26 does not operate and outputs a turn-off signal to the lighting device 24.
[0043]
Here, when the power supply slowly rises, the capacitor C5B does not always rise quickly even if the capacitance of the capacitor C5A is selected to be larger than the capacitance of the capacitor C5B. When the capacitors C5A and C5B rise almost at the same time because they are connected to the Tr3 side, a low level is output to the knot circuit 25B connected to the transistor Tr3 side with a lower voltage level.
[0044]
As described above, the output circuit 22 has a difference between the capacitances of the capacitors C5A and C5B, and the transistor Tr3 of the drive circuit 23 is connected to the knot circuit 25B. In the initial state, the signal is at the low level, so that the signal for turning off the lamp 39 is output. As a result, the lamp 39 is not turned on when the power is turned on, and the use can be started with the same feeling as a normal lighting switch.
[0045]
(Second Embodiment) FIG. 5 is an external configuration diagram of a lighting device 27 according to a second embodiment of the present invention. The lighting device main body 28 of the lighting device 27 incorporates the lighting device 24 and the optical signal switch device 11 of the first embodiment, and a lamp 39 is mounted inside the light transmitting cover 29. An illumination selection switch 30 is provided on a side surface of the illumination device main body 28, and a light projector 12 and a light receiver 16 are provided on a front surface where the light transmitting cover 29 is provided. The light projector 12 and the light receiver 16 are provided deep in the step portion 31 so that the light receiver 16 does not receive light other than the reflected wave from the light projector 12 as much as possible.
[0046]
The illumination selection switch 30 is a switch that can select three states of AUTO, OFF, and ON. AUTO is a state in which the light signal type switch device 11 can be turned on and off, and OFF is an optical signal type switch device 11. Is set to turn off the lamp, and ON is a switch position for turning on the lamp excluding turning on / off by the optical signal type switch device 11.
[0047]
FIG. 6 is an explanatory diagram of the illumination selection switch 30. As shown in FIG. 6A, the lighting selection switch 30 is connected to the lighting device 24, and as shown in FIG. 6B, the lighting selection switch 30 is constituted by a rocker-type switch. , AUTO, OFF, ON or ON, OFF, AUTO. That is, it is always possible to switch from AUTO to ON or ON to AUTO via OFF. This is because the output circuit 22 of the optical signal switch device 11 is set to the low level as an initial state when the power is turned on, and when the AUTO is selected, the optical signal switch device 11 starts from the light-off state. Because it becomes. As described above, since switching from AUTO to ON or switching from ON to AUTO via OFF is always performed, switching to the optical signal type switch device 11 can be performed smoothly.
[0048]
7A and 7B are explanatory views of the mounting member 32 of the light projector 12 and the light receiver 16; FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a bottom view. The attachment member 32 is formed of a black rubber material, and the light emitter 12 and the light receiver 16 are attached. The floodlight 12 is inserted and arranged in a tubular mounting cavity 33 formed in the mounting member 32. The light projector 12 is of a shell type, and is arranged such that the light emitting portion of the infrared light emitting diode 14 faces the upper surface and the connection terminal of the infrared light emitting diode 14 is positioned on the lower surface. For this reason, a hole 34 through which the connection terminal of the infrared light emitting diode 14 of the light projector 12 is passed is provided at the bottom of the cylindrical mounting cavity 33.
[0049]
The light receiver 16 is mounted and installed on a mounting shelf 35, and the light receiver 16 is box-shaped and arranged so that the light receiving portion of the photodiode faces the upper surface, and the photodiode connection terminal is positioned from the side surface. You. The connection terminal of the light receiver 16 is drawn out to the near side in FIG. A mountain-shaped light-shielding wall 36 is provided between a cylindrical mounting cavity 33 in which the light projector 12 is disposed and a mounting shelf 35 in which the light receiver 16 is disposed. 16 is prevented.
[0050]
FIG. 8 is a cross-sectional view of the light-shielding cover 37 that covers the upper surface and the side surface of the mounting member 32. A light transmitting member 38 that can pass infrared light is formed on the upper part of the light shielding cover 37.
[0051]
In this way, the light emitter 12 and the light receiver 16 are shielded from light by the rubber attachment member 32, and the bottom of the attachment member 32 is provided at the bottom of the attachment member 32 so that the infrared light leaking from the projector 12 does not leak to the lower substrate surface. Only the holes 34 for mounting components of the infrared light emitting diode 14 of the light projector 12 are provided. This prevents the light receiver from detecting the light from the light projector 12 reflected from the substrate.
[0052]
According to the second embodiment, when the power is turned on, the illumination selection switch 30 is always turned off from AUTO and turned on in accordance with the characteristics of the optical signal type switch device 11 starting from a low level (OFF) as an initial state. Alternatively, since switching from ON to AUTO is performed, switching to the optical signal type switch device 11 can be performed smoothly. Further, since the light projector 12 and the light receiver 16 are attached to the mounting member 32 which can not only shield light from the light emitter 12 and the light receiver 16 but also shield light from the substrate side (lower side), the leakage Malfunction due to external light can be more effectively prevented.
[0053]
According to the first aspect of the present invention, noise contained in the signal from the photodetector is first removed by the filter circuit, and then amplified by the amplifier circuit. Since the wave component is not determined to be an optical signal from the projector, malfunction can be prevented. Also, the gate circuit allows the reflected wave amplified by the amplifier circuit to pass when a pulse signal from the projector is input, and converts the analog signal to a digital signal by shaping the waveform of the reflected wave that passed through the gate circuit. The configuration is simplified.
[0054]
According to the second aspect of the present invention, since the sensitivity adjustment circuit for adjusting the reception sensitivity of the reflected wave is provided in the preceding stage of the amplification circuit, the sensitivity can be adjusted before amplification. Therefore, simple adjustment can be properly performed.
[0055]
According to the third aspect of the present invention, the optical signal switch device puts the load into an inoperative state when the power is turned on, so that the light receiver receives the reflected wave from the light emitter after the power is turned on, and operates the load. And you can start using it with the same feeling as a normal on / off switch. Further, according to the invention of claim 4, it is possible to provide a lighting device having the effect of any one of claims 1 to 3.
[Brief description of the drawings]
FIG. 1 is a block diagram of an optical signal type switch device according to a first embodiment of the present invention.
FIG. 2 is a circuit diagram illustrating an example of a gate circuit according to the first embodiment of the present invention.
FIG. 3 is a term chart showing an operation of the optical signal switch device according to the first embodiment of the present invention.
FIG. 4 is a circuit diagram illustrating an example of an output circuit and a drive circuit according to the first embodiment of the present invention.
FIG. 5 is an external configuration diagram of a lighting device according to a second embodiment of the present invention.
FIG. 6 is a diagram illustrating an illumination selection switch according to a second embodiment of the present invention.
FIG. 7 is an explanatory diagram of a mounting member for a light emitter and a light receiver according to a second embodiment of the present invention.
FIG. 8 is a cross-sectional view of a light-shielding cover that covers an upper surface and side surfaces of a mounting member according to a second embodiment of the present invention.
[Description of Signs] 11 ... optical signal type switch device, 12 ... light emitter, 13 ... oscillator, 14 ... infrared light emitting diode, 15 ... object, 16 ... light receiver, 17 ... filter circuit, 18 ... sensitivity adjustment circuit, 19 ... Amplifying circuit, 20 gate circuit, 21 waveform shaping circuit, 22 output circuit, 23 driving circuit, 24 lighting device, 25 knot circuit, 26 driving relay, 27 lighting device, 28 lighting device body, 29: translucent cover, 30: illumination selection switch, 31: step, 32: mounting member, 33: cylindrical mounting cavity, 34: hole, 35: mounting shelf, 36: light shielding wall, 37: light shielding cover, 38 ... Translucent member, 39 ... lamp

Claims (4)

A projector for transmitting a light signal of a fixed level at a fixed frequency based on a pulse signal of a fixed frequency;
A light receiver for receiving a reflected wave from an object of an optical signal transmitted from the light emitter;
A filter circuit for removing noise included in the reflected wave received by the light receiver;
An amplifier circuit for amplifying the reflected wave from which noise has been removed by the filter circuit;
A gate circuit for passing a reflected wave amplified by the amplifier circuit when a pulse signal is input from the light emitter;
A waveform shaping circuit for shaping the waveform of the reflected wave passing through the gate circuit;
An output circuit for inverting an output level each time a reflected wave whose waveform has been shaped by the waveform shaping circuit is input;
A drive circuit for outputting a load on / off signal based on an output signal of the output circuit;
An optical signal switch device comprising: 2. The optical signal type switching device according to claim 1, wherein a sensitivity adjustment circuit for adjusting the reception sensitivity of the reflected wave is provided between the filter circuit and the amplification circuit. 3. The optical signal switch device according to claim 1, wherein the output circuit is in a state of outputting a load switching signal in an initial state when power is turned on. An optical signal switch device according to any one of claims 1 to 3, and
With a lamp;
A lighting fixture body including a lighting device for lighting the lamp and including the light signal type switch device;
A lighting device comprising:

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