JP5671747B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device that detects the approach of an object to be detected and controls the operation of illumination.

  2. Description of the Related Art A vehicle interior lighting device that detects the approach of an object to be detected such as a human body and turns on / off a power source of an illumination light source is known (see Patent Document 1 below). In this vehicle interior lighting device, an electrode part is disposed so as to cover the light source and the substrate, and when a human body approaches the electrode part, the light source is turned on to turn on the illumination.

JP 2007-230450 A

  However, in the vehicle interior lighting device disclosed in Patent Document 1 described above, a parasitic capacitance exists between the electrode unit, the light source, and the substrate. For this reason, when the light source is turned on, turned off, or dimmed, if the potential of the light source and its drive circuit fluctuates, the amount of charge in the electrode portion fluctuates and the capacitance value to be detected changes, resulting in malfunction. Can happen.

  In order to solve the above-described problems caused by the prior art, the present invention provides an illumination device capable of preventing malfunction without affecting the detection of an object to be detected by a sensor electrode even if the potential of the circuit fluctuates. For the purpose.

  In order to solve the above-described problems and achieve the object, an illumination device according to the present invention includes a sensor in which a capacitance between an illumination unit including an illumination light source and the detected object changes due to the approach of the detected object. An electrode, a guard electrode that forms a capacitive coupling with the illumination unit, the sensor electrode and the guard electrode, and a capacitance value between the sensor electrode and the object to be detected is measured to measure the object. An approach detecting unit that detects the approach of a detected object and controls the guard electrode to the same potential as the sensor electrode, and an illumination that controls lighting, extinction, or dimming of the illumination light source based on a detection result of the approach detecting unit The guard electrode is arranged at a position where capacitive coupling with the illumination unit is larger than a parasitic capacitance between the sensor electrode and the illumination unit.

  According to the illumination device according to the present invention, the guard electrode that forms the capacitive coupling with the illumination unit is disposed at a position that is larger than the parasitic capacitance between the sensor electrode and the illumination unit. The fluctuation of the charge amount based on the guard electrode is dominant in the guard electrode and does not affect the sensor electrode. Since the guard electrode is controlled to the same potential as the sensor electrode, no charge transfer occurs between the guard electrode and the sensor electrode. For this reason, the capacitance value between the sensor electrode and the object to be detected can be accurately measured, and the operation of the illumination unit can be controlled by accurately and reliably detecting the object to be detected by the sensor electrode. Malfunctions can be prevented.

  The guard electrode is made of, for example, a first guard electrode disposed closer to the illuminating unit than the sensor electrode and a conductive conductor having transparency, and is arranged to cover the illuminating unit. And at least one of a third guard electrode arranged so as to be integrated with the illumination unit.

  Moreover, it is good also as a structure further equipped with the ground electrode arrange | positioned between the said guard electrode and the said illumination part.

  Further, a housing to which the sensor electrode, the guard electrode, and the lighting unit are mounted is provided, and the guard electrode is mounted between the sensor electrode and the lighting unit in a path along the housing. It may be a configuration.

  According to the present invention, it is possible to prevent a malfunction without affecting the detection of an object to be detected by the sensor electrode even if the potential of the circuit fluctuates.

It is a block diagram which shows the circuit structure of the illuminating device which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the internal structure of the same illuminating device. It is a top view which shows the electrode part of the illuminating device. It is a circuit diagram of the electrostatic capacitance detection circuit of the illumination device. It is sectional drawing which shows a part of internal structure of the illuminating device which concerns on the 2nd Embodiment of this invention. It is a top view which shows the electrode part of the illuminating device. It is sectional drawing which shows a part of internal structure of the illuminating device which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the internal structure of the illuminating device which concerns on the 4th Embodiment of this invention. It is a perspective view which shows the LED board of the same illuminating device. It is a figure which shows the other example of the LED board of the illumination device. It is sectional drawing which shows the internal structure of the illuminating device which concerns on the 5th Embodiment of this invention. It is sectional drawing which shows a part of internal structure of the illuminating device which concerns on the 6th Embodiment of this invention. It is a circuit diagram of the electrostatic capacitance detection circuit 21 of the illuminating device which concerns on the 7th Embodiment of this invention.

  Embodiments of a lighting device according to the present invention will be described below in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a block diagram showing a circuit configuration of a lighting apparatus according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing an internal configuration of the lighting device, and FIG. 3 is a plan view showing an electrode portion of the lighting device. The illuminating device 100 according to the present embodiment is used as a room lamp provided in, for example, a ceiling portion of a vehicle interior of an automobile.

  As shown in FIG. 1, the lighting device 100 detects, for example, the approach of a finger 9 as an object to be detected, and turns on, turns off, or adjusts the lighting. The detected object may be a hand or another part of the human body in addition to the finger 9. The illumination device 100 includes, for example, an electrode unit 10, an approach detection unit 20, an illumination control unit 23, and an illumination unit 30. The electrode unit 10 includes a sensor electrode 11 that detects the capacitance between the finger 9 and a guard electrode 12 that forms a capacitive coupling with the illumination unit 30.

  The approach detection unit 20 measures the capacitance value between the sensor electrode 11 and the ground terminal corresponding to the capacitance between the sensor electrode 11 and the finger 9, and outputs the information as a voltage value. A capacitance detection circuit 21 and a determination circuit 22 that determines the approach of the finger 9 based on information from the capacitance detection circuit 21 are provided. The capacitance detection circuit 21 is connected to the sensor electrode 11 and the guard electrode 12 and drives the guard electrode 12 to the same potential as the sensor electrode 11. The “same potential” here is not limited to a complete “same potential” but also includes “substantially the same potential” including an error.

  Based on the determination result from the determination circuit 22, the illumination control unit 23 controls the operation of turning on / off or dimming the illumination unit 30.

  As illustrated in FIG. 2, the lighting device 100 configured in this manner includes a housing 40 that is disposed, for example, on a ceiling portion of an automobile, and is configured inside the housing 40. The housing 40 includes a resin-made disk-shaped back panel 41, a frame body 42 attached to the back panel 41, and a disk-shaped lens mounted on the frame body 42 and disposed on the front surface of the illumination unit 30. Or it is comprised with the transparent panel 43 which consists of transparent resin. In the figure, the back panel 41 is arranged on the lower side. However, when it is attached to the ceiling of the automobile, the back panel 41 is arranged on the ceiling surface, and the transparent panel 43 is arranged on the lower side. .

  The back panel 41 may be formed by processing a conductor member such as an aluminum plate in addition to the resin. However, when a conductive member is used, it is desirable that it be fixed at the same potential (guard potential) as the guard electrode 12 or a ground potential.

  The illumination unit 30 is disposed in a substantially central portion of the back panel 41 inside the housing 40, and includes an LED substrate 32 and a plurality of LEDs 31 mounted on the LED substrate 32. A circuit board 29 connected to the LED board 32 and the wiring 19 is also attached to the back panel 41. On the circuit board 29, for example, an electrostatic capacitance detection circuit 21 and a determination circuit 22, an illumination control unit 23 (not shown), and the like are mounted and connected to the electrode unit 10.

  Light emitted from the LED 31 of the illumination unit 30 is irradiated to the outside of the housing 40 through the transparent panel 43. As shown in FIG. 3, for example, an electrode portion 10 formed in an annular shape is disposed inside the frame body 42 around the transparent panel 43. The electrode unit 10 is composed of a flexible substrate, a membrane circuit, or the like in which the sensor electrode 11 and the guard electrode 12 are formed on both surfaces of the base substrate 13. The base substrate 13 is made of, for example, an insulating resin film or a printed board having a thickness of about 0.1 mm to 1.6 mm.

  The electrode portion 10 is attached to the back surface of the frame body 42 in such a state that the sensor electrode 11 is disposed on the frame body 42 side where the finger 9 approaches and the guard electrode 12 is on the illumination section 30 side. That is, in the present embodiment, the guard electrode 12 is disposed so as to be close to the sensor electrode 11 and between the sensor electrode 11 and the illumination unit 30. Therefore, the guard electrode 12 forms a capacitive coupling with the illumination unit 30, and this capacitive coupling is larger than the parasitic capacitance between the sensor electrode 11 and the illumination unit 30. And the capacitive coupling of the sensor electrode 11 and the illumination part 30 reduces by arrange | positioning the guard electrode 12 in this way.

  The sensor electrode 11 and the guard electrode 12 are made of a metal member (conductive material) such as copper, copper alloy, aluminum, iron, or the like that is patterned on the base substrate 13 made of an insulating resin such as PET, PEN, PI, and PA. Etc. can be configured. Moreover, when these electrodes 11 and 12 are transparent electrodes, they can be composed of tin-doped indium oxide (ITO) or a conductive polymer.

  As the conductive polymer, for example, PEDOT / PSS (polyethylene dioxythiophene / polystyrene sulfonic acid), PEDOT / TsO (polyethylene dioxythiophene / toluene sulfonate), or the like can be used. Moreover, you may make it use light-emitting bodies, such as a light bulb and electroluminescence (EL), instead of LED31 which is a light source.

  The capacitance detection circuit 21 measures a capacitance value based on the capacitance between the finger 9 approaching the illumination device 100 and the sensor electrode 11, and sends information indicating the capacitance value to the determination circuit 22. Output. The electrostatic capacitance detection circuit 21 includes, for example, a CV conversion circuit, converts the electrostatic capacitance detected by the sensor electrode 11 into a voltage, and outputs the voltage.

  The determination circuit 22 compares the capacitance value from the capacitance detection circuit 21 with a predetermined threshold value, for example, the capacitance value rises above the threshold value, or the capacitance value is a predetermined value. For example, it is determined whether or not the finger 9 has approached the lighting device 100 and the extent to which the finger 9 has approached, for example, when the inclination changes more than the inclination (threshold value).

  The capacitance detection circuit 21 includes a circuit for measuring a known CR charge / discharge time, a circuit for transferring charged charges to a known capacitor, a circuit for measuring impedance, and an oscillation circuit to measure the oscillation frequency. A circuit or the like can be used. The guard electrode 12 connected to such a capacitance detection circuit 21 is driven to the same potential as the sensor electrode 11.

  FIG. 4 is a circuit diagram showing a specific example of the capacitance detection circuit 21. A sensor electrode 11 is connected to the inverting input terminal of the operational amplifier OP1 via the switch S1, and a guard electrode 12 is connected to the non-inverting input terminal. The non-inverting input terminal of the operational amplifier OP1 can selectively supply either the reference voltage Vr or the ground voltage GND by switching the switch S2. A transfer capacitor Cf1 is connected between the inverting input terminal and the output terminal of the operational amplifier OP1, and a switch S3 is connected in parallel with the transfer capacitor Cf1.

  In this capacitance detection circuit 21, first, the switch S1 is connected to the ground terminal, the switch S2 is connected to the ground terminal, and the switch S3 is turned on. As a result, the electric charges of the sensor electrode 11 and the transfer capacitor Cf1 are discharged. Next, the switch S1 is switched so that the sensor electrode 11 and the inverting input terminal of the operational amplifier OP1 are connected, the switch S2 is connected to the reference voltage Vr, and the switch S3 is turned off. As a result, the reference voltage Vr is applied to the sensor electrode 11 through an imaginary short on the input side of the operational amplifier OP1, the sensor electrode 11 is charged with the charge C1Vr, and the transfer capacitor Cf1 is also charged with the charge C1Vr. Here, the capacitance values C1 and Cf are a capacitance value between the sensor electrode 11 and the ground and a capacitance value of the transfer capacitor Cf1, respectively.

  Next, the switch S2 is connected to the ground terminal, and then the switch S1 is connected to the ground terminal. As a result, the output voltage V1 = (C1 / Cf) Vr is output as the transfer capacitor Cf1 is charged with the charge C1Vr. The output voltage V1 varies depending on the capacitance value C1 between the sensor electrode 11 and the ground terminal, that is, the capacitance value between the sensor electrode 11 and the finger 9. For this reason, the approach of the finger 9 can be detected by determining the magnitude of the output voltage V1.

  Here, since there is a parasitic capacitance between the sensor electrode 11 and the illumination unit 30, in a state where the switch S1 is connected to the inverting input terminal of the operational amplifier OP1, the determination result of the determination circuit 22 in the subsequent stage, etc. When the illumination unit 30 is turned on, off, or dimmed, the accumulated charge amount of the sensor electrode 11 may change due to the potential change in the illumination unit 30.

  However, according to this embodiment, since the guard electrode 12 exists between the sensor electrode 11 and the illumination unit 30, the capacitive coupling with the illumination unit 30 is dominant in the guard electrode 12, and the sensor The charge amount of the electrode 11 is not affected by the potential fluctuation of the illumination unit 30. The guard electrode 12 is connected to the non-inverting input terminal of the operational amplifier OP1, and maintains the same potential as the sensor electrode 11. For this reason, the charge amount of the sensor electrode 11 is not affected by the guard electrode 12. As a result, according to the present embodiment, the configuration is such that the potential fluctuation of the illumination unit 30 hardly affects the sensor electrode 11.

  Therefore, the electrostatic capacitance detection circuit 21 can measure the voltage V1 corresponding to the electrostatic capacitance value C1 output from the operational amplifier OP1 to obtain a detection value. Therefore, according to the illumination device 100 according to the present embodiment, The approach of the finger 9 can be accurately detected, and the operation of the LED 31 can be reliably controlled by the illumination control unit 23. Thereby, malfunction of the illuminating device 100 can be prevented.

[Second Embodiment]
FIG. 5 is a cross-sectional view showing a part of the internal configuration of the illumination device according to the second embodiment of the present invention, and FIG. 6 is a plan view showing an electrode portion of the illumination device. As illustrated in FIG. 5, in the illumination device 100 according to the present embodiment, the configuration of the electrode unit 10A is different from the configuration of the electrode unit 10 according to the first embodiment.

  That is, the electrode portion 10A includes a sensor electrode 11 formed on one side of an annular base substrate 13 and a guard electrode 12 made of a transparent electrode formed in a disk shape on the inner peripheral side of the sensor electrode 11. It is prepared for. Similarly to the above, the sensor electrode 11 is disposed inside the frame body 42 around the transparent panel 43 to which the finger 9 approaches, and the guard electrode 12 is disposed inside the transparent panel 43 so as to cover the illumination unit 30.

  Even with such a configuration having the guard electrode 12, the capacitive coupling with the illumination unit 30 is dominant in the guard electrode 12. An accurate detection value due to the approach of 9 can be obtained. Therefore, the same operational effects as those of the first embodiment can be obtained.

[Third Embodiment]
FIG. 7 is a cross-sectional view showing a part of the internal configuration of the illumination apparatus according to the third embodiment of the present invention. As shown in FIG. 7, in the illumination device 100 according to this embodiment, the configuration of the electrode unit 10B is a combination of the electrode unit 10 according to the first embodiment and the electrode unit 10A according to the second embodiment. It has a configuration.

  That is, the electrode portion 10B includes a sensor electrode 11 and a first guard electrode 12a formed on both surfaces of the annular base substrate 13, and a disk on the inner peripheral side of the sensor electrode 11 and the first guard electrode 12a. And a second guard electrode 12b made of a transparent electrode formed in a shape. These arrangement modes are the same as described above.

  Even with such a configuration having the first and second guard electrodes 12 a and 12 b, it is possible to suppress the influence on the sensor electrode 11 due to the potential fluctuation of the illumination unit 30. Therefore, it is possible to obtain an accurate detection value due to the approach of the finger 9 and to obtain the same effects as those of the first and second embodiments.

[Fourth Embodiment]
FIG. 8 is a cross-sectional view showing an internal configuration of a lighting device according to the fourth embodiment of the present invention, and FIG. 9 is a perspective view showing an LED substrate of the lighting device. As illustrated in FIGS. 8 and 9, in the illumination device 100 according to the present embodiment, the configuration of the electrode unit 10 </ b> C is different from the configuration of the electrode units 10 to 10 </ b> B according to the first to third embodiments.

  That is, the electrode portion 10 </ b> C includes the sensor electrode 11 formed on one side of the annular base substrate 13 and the disc-shaped guard electrode 12 provided on the LED substrate 32. The sensor electrode 11 is disposed inside the frame body 42 around the transparent panel 43 that the finger 9 approaches, and the guard electrode 12 is disposed so as to cover almost the entire surface of the LED substrate 32.

  The guard electrode 12 is formed with a hole 12c through which the LED 31 of the illumination unit 30 is inserted. In addition, the guard electrode 12 is disposed under a reflector (not shown) or a bright base material, for example, in order to efficiently emit the light emitted from the LED 31 through the transparent panel 43, It may be colored with a bright color.

  Furthermore, the illumination unit 30 may be configured as shown in FIG. The LED board 32 shown in FIG. 10 has the LED wiring 33 formed on one side (in this example, the back panel 41 side) and the guard electrode 12 formed on the opposite side (in this example, the transparent panel 43 side). ing. Further, the LED 31 connected to the LED wiring 33 is arranged in a through hole 32 a formed in the LED substrate 32. If comprised in this way, size reduction can be achieved, suppressing the height of the illumination part 30 whole.

  As described above, even with the configuration in which the guard electrode 12 is integrally disposed on the LED substrate 32, the influence on the sensor electrode 11 due to the potential variation of the illumination unit 30 can be suppressed. Therefore, it is possible to obtain an accurate detection value due to the approach of the finger 9 and to obtain the same effects as those of the first to third embodiments.

[Fifth Embodiment]
FIG. 11 is a cross-sectional view showing an internal configuration of a lighting apparatus according to the fifth embodiment of the present invention. As shown to Fig.11 (a), as for the illuminating device 100 which concerns on this embodiment, the structure of electrode part 10D is the electrode part 10 which concerns on 1st Embodiment, and the guard electrode 12 which concerns on 4th Embodiment. Instead, the configuration is such that the ground electrode 14 formed on the LED substrate 32 is combined.

  That is, the electrode portion 10 </ b> D includes the sensor electrode 11 and the guard electrode 12 formed on both surfaces of the annular base substrate 13, and the disk-shaped ground electrode 14 provided on the LED substrate 32. ing. The arrangement mode of the sensor electrode 11 and the guard electrode 12 is the same as that of the first embodiment, and the arrangement mode of the ground electrode 14 is the same as that of the guard electrode 12 of the fourth embodiment.

  As described above, the configuration in which the ground electrode 14 is disposed between the LED substrate 32 and the guard electrode 12 can suppress fluctuations in the power supply of the lighting device 100. In addition, since the guard electrode 12 is disposed between the ground electrode 14 and the sensor electrode 11, the sensor electrode 11 is not affected by the ground.

  Therefore, according to this embodiment, even if the ground electrode 14 is present, the detection sensitivity of the sensor electrode 11 does not decrease, and the influence of the potential fluctuation of the illumination unit 30 is shielded by the ground electrode 14. The influence on the sensor electrode 11 due to the potential fluctuation of the unit 30 can be suppressed by the guard electrode 12. For this reason, the exact detection value by the approach of the finger | toe 9 can be obtained, and there can exist an effect similar to the said 1st-4th embodiment.

  As shown in FIG. 11B, the guard electrode 12 is disposed on the ground electrode 14 via an insulating base material or space, and is connected to the capacitance detection circuit 21 via a wiring (not shown). If it comprises, the detection sensitivity and the effect suppression effect of the electric potential fluctuation | variation of the illumination part 30 will improve further.

[Sixth Embodiment]
FIG. 12: is sectional drawing which shows a part of internal structure of the illuminating device which concerns on the 6th Embodiment of this invention. As illustrated in FIG. 12, in the illumination device 100 according to this embodiment, the configuration of the electrode unit 10 </ b> E is different from the configurations of the electrode units 10 to 10 </ b> D according to the first to fifth embodiments. That is, the electrode portion 10E includes a sensor electrode 11 formed in an annular shape on one surface of the base substrate 13, and a guard electrode 12 formed in an annular shape on the outer peripheral side on the same surface as the sensor electrode 11. It is configured.

  In general, since the dielectric constant ε of the housing 40 is high, capacitive coupling between the sensor electrode 11 and the illumination unit 30 via the housing 40 becomes a problem. This embodiment is intended to reduce this. That is, the guard electrode 12 is mounted at a predetermined position along the frame body 42 and the back panel 41 between the mounting position of the sensor electrode 11 on the frame body 42 and the mounting position of the illumination unit 30 on the back panel 41. The Rukoto. In this way, the guard electrode 12 is arranged between the sensor electrode 11 and the illumination unit 30 in the path along the housing 40, so that the dielectric between the sensor electrode 11 and the illumination unit 30 via the housing 40 is achieved. In addition to guarding the general coupling, the conductive coupling (leakage current) through the housing 40 can also be guarded. For this reason, it is possible to obtain an accurate detection value due to the approach of the finger 9 and achieve the same effects as those of the first to fifth embodiments.

[Seventh Embodiment]
FIG. 13 is a diagram showing a capacitance detection circuit 21 of the illumination device according to the seventh embodiment of the present invention. As shown in FIG. 13, the capacitance detection circuit 21 according to the present embodiment is configured to perform a differential operation. In this capacitance detection circuit 21, a method is adopted in which the charge charged with a known voltage as shown in FIG. 4 is transferred to a known capacitance and the voltage is measured.

  In this embodiment, in addition to the circuit configuration shown in FIG. 4, an operational amplifier OP2 equivalent to the operational amplifier OP1 shown in FIG. 4 is provided. A dummy electrode 15 is connected to the inverting input terminal of the operational amplifier OP2 via the switch S1, and a switch S2 that selectively supplies the reference voltage Vr and the ground voltage GND is connected to the non-inverting input terminal. Further, a transfer capacitor Cf2 is connected between the inverting input terminal and the output terminal of the operational amplifier OP2, and a switch S3 is connected in parallel with the transfer capacitor Cf2. For example, the dummy electrode 15 is disposed at a position where sensitivity to the human body such as the finger 9 is lost (for example, a position where the sensitivity to the proximity of the human body can be reduced by the shield electrode). The sensor electrode 11 has the same sensitivity.

  The two circuits centered on the operational amplifiers OP1 and OP2 perform the same operation, and the resulting output voltages V1 and V2 are differentially amplified by the differential amplifier SA and output. The output voltage V at this time is V = (C1 / Cf−C2 / Cf) Vr (where C2 is the electrostatic capacity between the dummy electrode 15 and the ground terminal, and Cf is the electrostatic capacity of the transfer capacitors Cf1 and Cf2). Capacity) and a voltage V corresponding to the capacitance C1.

  In this way, by setting the capacitance detection circuit 21 to a differential operation (differential circuit), it is possible to cancel the temperature characteristics of the circuit and reduce common mode noise.

[Other Embodiments]
In each of the above embodiments, the electrodes are formed on one side or both sides of the base substrate 13 as an example. It may be pasted. Alternatively, each electrode may be formed by printing or applying a conductive ink or the like.

  In addition, the arrangement | positioning aspect of the sensor electrode 11, the guard electrode 12, the illumination part 30, and the ground electrode 14 in the illuminating device 100 is various as long as it is a range which does not deviate from the meaning of this invention other than what was demonstrated in said each embodiment. Things can be applied.

  Alternatively, a plurality of sensor electrodes may be provided in the electrode section, and these may be connected to the capacitance detection circuit 21 via a switch, and the capacitance value may be measured by switching each sensor electrode using the switch. . And if the time change of each measured electrostatic capacitance value is monitored and the operation of the LED 31 is controlled by the movement of the finger 9, finer illumination control becomes possible.

  Note that the application of the present invention is not limited to a lighting device, and can be applied to other various devices. That is, the capacitance value between the human body is similarly measured, and the measurement result is output as a switch output, or used as a control signal, so that it can be used as an on-vehicle device, household appliance, industrial device, transportation device, The present invention can be applied to a capacitance type switch device or an equipment control device used for controlling a building or the like.

DESCRIPTION OF SYMBOLS 10 Electrode part 11 Sensor electrode 12 Guard electrode 13 Base base material 14 Ground electrode 15 Dummy electrode 20 Approach detection part 21 Capacitance detection circuit 22 Judgment circuit 23 Illumination control part 30 Illumination part 31 LED
32 LED board 40 Case 41 Back panel 42 Frame 43 Transparent panel

Claims (7)

An illumination unit including an illumination light source;
A sensor electrode in which the capacitance between the object to be detected changes due to the approach of the object to be detected;
A guard electrode that forms a capacitive coupling with the illumination section;
The sensor electrode and the guard electrode are connected to measure the capacitance value between the sensor electrode and the detected object to detect the approach of the detected object, and the guard electrode is the same as the sensor electrode. An approach detector that controls the potential;
An illumination control unit for turning on, turning off or dimming the illumination light source based on the detection result of the approach detection unit;
The guard electrode is disposed at a position where a capacitive coupling with the illumination unit is larger than a parasitic capacitance between the sensor electrode and the illumination unit, and the guard electrode is closer to the illumination unit than the sensor electrode. An illuminating device characterized by being arranged at a close position . The lighting device according to claim 1, wherein the sensor electrode and the guard electrode are formed on the front and back sides of a base substrate made of an insulating resin, and the guard electrode is disposed on the lighting unit side .   The lighting device according to claim 1, wherein the guard electrode is made of a transparent conductor, and is disposed so as to cover the lighting unit. The guard electrode is
A first guard electrode disposed closer to the illumination unit than the sensor electrode;
A second guard electrode made of a conductor having transparency and arranged to cover the illumination section;
The lighting device according to claim 1, wherein: An illumination unit including an illumination light source;
A sensor electrode in which the capacitance between the object to be detected changes due to the approach of the object to be detected;
A guard electrode that forms a capacitive coupling with the illumination section;
The sensor electrode and the guard electrode are connected to measure the capacitance value between the sensor electrode and the detected object to detect the approach of the detected object, and the guard electrode is the same as the sensor electrode. An approach detector that controls the potential;
An illumination control unit for turning on, turning off or dimming the illumination light source based on a detection result of the approach detection unit;
With
The guard electrode is disposed at a position where capacitive coupling with the illumination unit is larger than a parasitic capacitance between the sensor electrode and the illumination unit, and the guard electrode is integrated with the illumination unit. lighting apparatus characterized in that it is arranged.   The lighting device according to claim 1, further comprising a ground electrode disposed between the guard electrode and the illumination unit. An illumination unit including an illumination light source;
A sensor electrode in which the capacitance between the object to be detected changes due to the approach of the object to be detected;
A guard electrode that forms a capacitive coupling with the illumination section;
The sensor electrode and the guard electrode are connected to measure the capacitance value between the sensor electrode and the detected object to detect the approach of the detected object, and the guard electrode is the same as the sensor electrode. An approach detector that controls the potential;
An illumination control unit for turning on, turning off or dimming the illumination light source based on a detection result of the approach detection unit;
Comprising a housing in which the sensor electrodes, the guard electrode and the lighting unit is mounted,
The guard electrode is mounted between the sensor electrode and the illumination unit in a path along the housing ,
The guard electrode is capacitive coupling between the illumination unit, the sensor electrode and being disposed in the larger position than the parasitic capacitance characteristic and to that lighting device of the lighting unit.

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