JP2016018592A - Light source unit and illuminating fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect deterioration and failures generated at light-emitting elements 122 and circuit components and perform control to turn off the light, in a light source unit 100 using the light-emitting elements 122 as a light source.SOLUTION: A light source unit 100 comprises: a plurality of light-emitting elements 122; a voltage dividing part 126 connected in parallel to the plurality of light-emitting elements 122; a control unit 124 that detects variation in a forward voltage applied to the plurality of light-emitting elements 122; and a switch part 123 connected in series to the plurality of light-emitting elements 122, and controlled by the control unit 124. Thereby, the light source unit 100 can detect deterioration and failures generated at the light-emitting elements 122 and circuit components, and can perform control to turn off the light.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a light source unit including a light emitting element as a light source.

Conventionally, a straight tube fluorescent lamp has been widely used as a light source for lighting fixtures for homes and facilities.
On the other hand, in recent years, LED lamps using LED elements that consume less power than fluorescent lamps are becoming widespread and are being supplied to the market as alternative light sources for straight tube fluorescent lamps.
In addition, a straight tube lamp (LED lamp) using an LED as a light source is a straight tube LED lamp system with a JIS standard “JIS C 8159-1 L-shaped pin cap GX16t-5” (general lighting). It can be predicted that the usage will be expanded as a light source replacing the fluorescent lamp.

  Some of these LED lamps include an electrical component for causing the LED element to emit light, and have functions such as dimming the light emitted by the LED together with the function of lighting the LED element.

For example, in a lighting fixture that uses an LED as a light source, the output amount with respect to the same current attenuates as the output amount irradiated from the LED element accumulates the lighting time. Therefore, dimming is performed by controlling the amount of current to the LED element according to the accumulated lighting time so that there is no difference in the output amount from the LED element at the start of use and when the accumulated lighting time has elapsed.
Some LED lamps have this light control function. This LED lamp measures the cumulative lighting time and incorporates a microcomputer that controls the dimming ratio for dimming according to the cumulative lighting time so that the LED lamp itself can be dimmed (for example, Patent Document 1). reference).

Further, in the case of a fluorescent lamp, the product life can be visually recognized when the periphery of the base is blackened or blinks. On the other hand, LED elements can be used semipermanently while their luminous efficiency deteriorates, and LED lamps or lighting fixtures that do not have a dimming function do not recognize a decrease in the output amount of the LED elements. May continue to be used.
In view of this, there is a type in which the LED lamp is controlled to be extinguished after a lapse of a specific time by utilizing the fact that the resin material is insulated and deteriorated by the action of heat generated during operation of the LED element.
In this LED lamp, a life detection element is mounted on the substrate part, which is affected by the heat generated by the light emission of the LED element, and the resin material deteriorates and cuts off the current. It shuts off and goes off (for example, refer to Patent Document 2).

JP 2011-222320 A International Publication No. 2011/096165

However, the LED lamp of Patent Document 1 performs dimming control according to the cumulative lighting time measured and recorded by the microcomputer built in the LED lamp, and when the LED lamp reaches the end of its life, it is used as a lighting device separately from the LED lamp. The LED lamp is turned off by the provided output stop unit.
Therefore, when an illumination device that does not include an output stop unit is used, the LED lamp may continue to be lit with the LED element deteriorated.

Moreover, the LED lamp provided with the life detection element of Patent Document 2 needs to be arranged as close as possible to the LED element in order to detect the heat generation from the LED element. There is a possibility of blocking the irradiation from the LED element.
In addition, if an electronic component other than the LED element is installed near the life detection element, heat generation of the LED element cannot be accurately detected, and the LED element may be turned off before the LED element reaches the end of its life. It is considered that the light-off control cannot be performed in response to a short circuit, a fault occurring in the circuit, or a failure.

  Therefore, the present invention has been made to solve the above-described problems, and in a light source unit using a light emitting element as a light source, a mechanism for detecting deterioration and failure occurring in the light emitting element and circuit components and controlling the light extinction. An object of the present invention is to provide a light source unit provided with the inside.

  The light source unit of the present invention is applied with a plurality of light emitting elements connected in series, a voltage dividing unit connected in parallel to the plurality of light emitting elements, and a voltage divided by the voltage dividing unit, A control unit that detects fluctuations in forward voltage applied to the light emitting element, and an open / close unit that is connected in series with the plurality of light emitting elements and controlled by the control unit. It is.

  The present invention can provide a light source unit including a mechanism for detecting deterioration and failure occurring in the light emitting element and circuit components and controlling the extinction in the light source unit using the light emitting element as a light source.

FIG. 3 is a perspective view of a lighting fixture in the first embodiment. 2 is a plan view of the LED lamp in Embodiment 1. FIG. FIG. 3 is a cross-sectional view taken along line AA ′ shown in FIG. 2 in the first embodiment. 3 is a circuit diagram of the lighting fixture in Embodiment 1. FIG. FIG. 3 is a circuit diagram of the LED lamp in the first embodiment. 6 is a circuit diagram of a lighting fixture in Embodiment 2. FIG. 6 is a circuit diagram of an LED lamp according to Embodiment 2. FIG.

Embodiment 1.
In Embodiment 1, as an example of a lighting fixture according to the present invention, a main body having an inverted Fuji shape attached to a mounted portion such as a ceiling (hereinafter, the ceiling is described as an example of the mounted portion but is not limited to the ceiling). A lighting fixture 1000 will be described in which a straight tube type LED lamp 100 according to JIS C 8159-1 is attached to the part 1.
1 is a perspective view of a lighting fixture 1000 according to the present embodiment, FIG. 2 is a plan view of the LED lamp 100 shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA ′ shown in FIG. 4 is a circuit diagram of the lighting fixture 1000 shown in FIG. 1, and FIG. 5 is a detailed circuit diagram of the LED lamp 100 shown in FIG.
In the following description, for convenience, the ceiling side (attached surface side) will be described as the upper surface side, and the floor surface (opposite side to the attached surface) will be described as the lower surface side.

First, the structure of each part of the lighting fixture 1000 is demonstrated.
The luminaire 1000 includes a main body 1 that is fixed to the attached portion, and an LED lamp 100 (or a light source unit 100) that is detachably attached to the main body 1.

The main body 1 has a substantially box shape, and the short cross section has an inverted Fuji shape in which the upper surface side is formed larger than the lower surface side.
The main body 1 also includes a lighting device 10 (not shown) for supplying power from a commercial power supply provided outside to the LED lamp 100 and is provided on the main body on the upper surface side of the main body 1. The side face 1a is provided with a power supply socket 20 and a holding socket 30 for detachably holding the LED lamp 100 at both ends in the longitudinal direction.

The lighting device 10 is a device that supplies power from a commercial power source to the LED lamp 100 via a power supply wire or the like drawn from the outside of the main body 1 to light the LED lamp 100, and is disposed inside the main body 1. Has been.
The lighting device 10 is a constant current power source having a function of keeping a current flowing through the LED lamp 100 constant, and includes a diode bridge 11, a capacitor 12, a switching element 13, a current limiting resistor 14, a control IC 15, a diode D1, a capacitor C2, It is comprised from the coil L1. The circuit configuration of the lighting device 10 is a so-called buck converter.

  The diode bridge 11 rectifies the AC voltage supplied from the commercial power supply, and the voltage rectified by the diode bridge 11 is controlled to a constant voltage value by the capacitor 12.

The switching element 13 is composed of an N-channel type MOSFET. The drain of the switching element 13 is connected to one end of the coil 18, the source is connected to one end of the current detection resistor 14, and the gate is connected to a GATE terminal which is one of output terminals of the control IC 15.
The switching element 13 is controlled by the control IC 15 so as to be in a conductive state or a cut-off state between the drain and the source.

The current detection resistor 14 is a resistor for detecting a current flowing through the LED lamp 100. The current detection resistor 14 is installed on the current path between the VL terminal of the LED lamp 100 and the GND terminal side of the capacitor 12, and generates a potential difference between the VL terminal of the LED lamp 100 and the capacitor 12. is there.
One end of the current detection resistor 14 is connected to the source of the switching element 13 and the other end is connected to the VL terminal of the capacitor A12.
The CS terminal of the control IC 15 is connected to one end of the current detection resistor 14 (the side connected to the source of the switching element 13).

The control IC 15 includes a constant current control IC and the like. The Vin terminal of the control IC 15 is connected to the VH side of the capacitor 12, and the GND terminal is connected to the VL side of the capacitor 12.
In addition, the CS terminal of the control IC 15 is connected to one end of the current detection resistor 14, and the control IC 15 allows the voltage at one end of the current detection resistor 14 input from the CS terminal to be a predetermined voltage. The on-duty ratio is controlled, and the LED current flowing through the LED element 122 becomes a predetermined constant current.

The power supply socket 20 is provided on one of the longitudinal ends of the main body upper side surface 1a, and is electrically connected to the lighting device 10 via an electric wire.
The power supply socket 20 is fitted into a power supply socket main body 21 formed in a semi-cylindrical shape, and an L-shaped pin (corresponding to GX16t-5 (A)) of the LED lamp 100 provided in the power supply socket main body 21. A power supply terminal 22 is provided which is electrically connected.

The holding socket 30 is disposed on the upper side surface 1 a of the main body so as to face the power supply socket 20.
The holding socket 30 is provided with a holding socket body 31 formed in a semi-cylindrical shape, and a holding pin (corresponding to GX16t-5 (B)) of the LED lamp 100 provided inside the holding socket body 31. Match.

The LED lamp 100 includes a cylindrical tube portion 110 having a cylindrical shape, an LED substrate portion 120 provided inside the tube tube portion 110 and having a plurality of LED elements 122 (or light emitting elements) mounted on a substrate 121, and an LED substrate portion. A heat-dissipating part 130 that abuts on 120 and dissipates heat generated from the LED substrate part 120; a power-supply base 140 that is disposed on one of the longitudinal ends of the tubular tube part 110 and is connected to the power-supply socket 20; The holding cap 150 is provided at the end of the portion 110 facing the power supply cap 140 and is fitted to the holding socket 30.
The LED board 120 is mounted with a switching element 123 (or opening / closing unit) that controls the lighting state of the LED element 122, a microcomputer 124 (or control unit), and the like.

  The cylindrical tube part 110 is formed by forming a transparent resin material, such as polycarbonate, in a long circular shape with a hollow cross section. The light irradiated from the substrate unit 120 is transmitted.

In the LED substrate 120, LED elements 122 are arranged at substantially equal intervals in the longitudinal direction on a substrate 121 that is elongated along the longitudinal direction of the tubular tube portion 110.
Further, the LED substrate 120 includes a switching element 123 connected in series with the LED element 122, a microcomputer 124 connected to the gate of the switching element 123, a constant voltage power supply part 125 serving as a power source of the microcomputer 124, a constant voltage A voltage divider 126 that controls the voltage to the power supply unit 125 is mounted.

  The switching element 123 is composed of an N channel type MOSFET. The drain of the switching element 123 is connected to one end of the LED element 122 on the cathode side, the source is connected to the VL terminal side of the LED lamp 100, and the gate is connected to the microcomputer 124.

  The microcomputer 124 includes a processor and the like, records a reference forward voltage Vf necessary for lighting the plurality of LED elements 122, a CS terminal connected to the voltage divider 126, and a switching element 123. A GATE terminal connected to the gate is provided.

  The constant voltage power supply unit 125 includes a constant voltage power supply circuit 125a, an NPN transistor 125b, and an electrolytic capacitor 125c. The constant voltage power supply circuit 125a can supply a constant voltage from the electrolytic capacitor 125c to the microcomputer 124. 125b is controlled.

The voltage divider 126 includes a first resistor 126a and a second resistor 126b connected in series, and is a voltage corresponding to the forward voltage Vf of the plurality of LED elements 122 applied from the lighting device 10. Is divided so as to be the starting voltage of the microcomputer 124.
The CS terminal of the microcomputer 124 is connected to a voltage dividing point between the first resistor 126a and the second resistor 126b.

  The heat dissipating part 130 is formed of a material having heat dissipation properties such as aluminum so as to be substantially the same as the cylindrical tube part 110 and the LED substrate 120, and the surface on which the LED element 122 of the LED substrate 120 is mounted. And is inserted into the inside of the tube portion 110.

The power supply cap 140 is attached to one end in the longitudinal direction of the tubular tube portion 110 and is the same as GX16t-5 (A) in JIS-C 8159-1.
The power supply base 140 includes a power supply base body part 141 that is connected to the cylindrical tube part 110 and has a bottomed cylindrical shape, and a pair of L-shaped pins 142 that protrude from the bottom surface of the power supply base body part 141. Further, the L-shaped pin 142 is connected to the LED board portion 120 inside the tube portion 110.

The holding cap 150 is attached to an end portion of the longitudinal end portion of the cylindrical tube portion 110 facing the power supply cap 140 and is the same as GX16t-5 (B) in JIS-C 8159-1.
The holding base 150 is provided with a bottomed cylindrical holding base body portion 151 connected to the tubular tube portion 110, and a holding pin 152 protruding from the bottom surface of the holding base body portion 151 and having a flange formed at the tip. ing.

Next, the lighting operation of the LED lamp 100 will be described.
First, in the LED lamp 100, the L-shaped pin 142 of the power supply base 140 is inserted into the power supply socket 20 of the main body 1, and the holding pin 152 of the holding base 150 is inserted into the protective socket 30. Fixed to.
At this time, the L-shaped pin 142 of the LED lamp 100 comes into contact with the power supply terminal 22 of the power supply socket 20, and the LED lamp 100 can be supplied with power from the lighting device 10.

  The lighting device 10 supplied with power from a commercial power source or the like divides a voltage corresponding to the forward voltage Vf of the plurality of LED elements 122 while maintaining a constant output current to the plurality of LED elements 122 connected in series. Applied to the unit 126.

  The voltage divider 126 divides the voltage Vf applied by the lighting device 10 to a voltage desired by the microcomputer 124 from the first resistor 126a and the second resistor 126b, and applies the divided voltage to the constant voltage power supply 125.

  The constant voltage power supply unit 125 controls the voltage applied from the voltage dividing unit 126 by the NPN transistor 125 b and applies a constant voltage to the microcomputer 124.

  The microcomputer 124 observes the voltage value at which the CS terminal is divided at the voltage dividing point, and starts application of the set voltage to the gate of the switching element 123 if the voltage value is a predetermined voltage value.

  When application of the set voltage to the gate of the switching element 123 is started, the switching element 123 connects the drain and the source. Thereby, the LED lamp 100 starts lighting.

Next, the operation of the microcomputer 124 when a failure occurs in the LED element 122 constituting the LED lamp 100 will be described.
The microcomputer 124 detects a failure of the LED element 122 from a change in the divided voltage of the voltage dividing unit 126 that is monitored by the CS terminal.

For example, when a short circuit occurs in one of the LED elements 122 constituting the LED lamp 100, the voltages of the plurality of LED elements 122 are reduced by the forward voltage Vf of the shorted LED elements 122. The voltage applied to the unit 126 is also reduced.
Therefore, the microcomputer 124 detects a decrease in the voltage divided by the voltage divider 126 and stops the application of the switching element 123 to the set voltage.

  The switching element 123 releases the drain-source connection when the application of the set voltage to the gate is stopped. As a result, the LED lamp 100 is turned off.

Further, when an open failure occurs in one of the LED elements 122, the voltage applied to the voltage divider 126 by the lighting device 10 increases.
The microcomputer 125 detects an increase in the voltage divided by the voltage divider 128, stops applying the switching element 123 to the set voltage, and establishes a connection between the drain and the source in the same manner as when a short circuit occurs. The LED lamp 100 is turned off.

In the present embodiment, the LED lamp 100 includes a plurality of LED elements connected in series, a switching element connected to the cathode side of the plurality of LED elements, a voltage dividing unit connected in parallel with the plurality of LED elements, And a microcomputer for controlling the operation of the switching element, and the LED lamp 100 detects the fluctuation of the voltage value divided by the microcomputer at the voltage dividing unit and controls the operation of the switching element.
Therefore, the LED lamp 100 that is lit by being supplied with a constant current detects a failure / failure such as a short circuit that has occurred inside the LED lamp 100 even if the connected device does not include a failure detection unit, an output stop unit, and the like. Can be controlled.

As a modification of the present embodiment, the LED lamp 100 ′ may include a cumulative lighting time recording unit (not shown) in which the microcomputer 124 accumulates the lighting time of the LED lamp 100 ′.
The cumulative lighting time recording unit measures and accumulates the time applied from the voltage dividing unit 126 to the microcomputer 124.
The microcomputer 124 compares the predetermined lighting time set in advance with the accumulated lighting time. When the cumulative lighting time reaches the predetermined lighting time, the microcomputer 124 stops the application of the set voltage to the switching element 123, and the switching element 123. The drain-source connection is released, and the LED lamp 100 is turned off.
When the cumulative lighting time reaches a predetermined time, the microcomputer 124 repeats connection and disconnection between the drain and source of the switching element 123 to turn on and off the LED lamp 100 ′, and the LED lamp 100 ′ is the predetermined time. May be notified.

  In the present embodiment, the lighting device 10 has been described with respect to the configuration including the diode bridge 11, the capacitor 12, the switching element 13, the current limiting resistor 14, the control IC 15, and the like. Any constant current power source that can be kept constant may be used.

  In the present embodiment, the heat radiating part 130 has been described with respect to the form inserted into the cylindrical tube part 110. However, the cylindrical pipe part and the heat radiating part are formed in a substantially semicircular shape and fitted. May be.

Embodiment 2. FIG.
In the second embodiment, the LED lamp 100 that is lit by being supplied with a constant current has been described in the first embodiment, but the LED lamp 200 that is lit by being supplied with a constant voltage is described in the second embodiment. Do.
The same configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed configurations will be omitted and different configurations will be described.
FIG. 6 is a circuit diagram of the lighting fixture 2000 according to the second embodiment, and FIG. 7 is a circuit diagram of the LED lamp 200 shown in FIG.

The luminaire 2000 includes a main body 1 fixed to the attached portion and an LED lamp 200 (or a light source unit) that is detachably attached to the main body 1.
The main body 1 also includes a lighting device 20 (not shown) that applies a constant voltage to the LED lamp 200.

  The lighting device 20 is a constant voltage power source that converts AC power supplied from a commercial power source and applies a constant DC voltage to the LED lamp 200, and includes a transformer, a diode bridge, a capacitor, a control IC, and the like.

The LED lamp 200 includes a cylindrical tube portion 110 having a cylindrical shape, an LED substrate 210 provided in the tube tube portion 110 and having a plurality of LED elements 122 mounted on the substrate 211, and the LED substrate 210 in contact with the LED substrate 210. A heat dissipating part 130 that dissipates heat generated from the power supply, a power supply base 140 that is disposed at one of the longitudinal ends of the tubular tube part 110 and is connected to the power supply socket 20 and is conductive, and a power supply base 140 that faces the power supply base 140 of the tubular pipe part 110. And a holding base 150 fitted to the holding socket 30.
In addition, a switching element 212 (or an opening / closing unit) that controls the lighting state of the LED element 122, a microcomputer 213 (or a control unit), and the like are mounted on the LED substrate 210.

In the LED substrate section 210, LED elements 122 are arranged at substantially equal intervals in the longitudinal direction on a substrate 211 that is formed along the longitudinal direction of the tubular tube section 110.
In addition, a switching element 212 and a detection resistor part 214 (or a detection part) are connected in series with the LED element to the LED substrate part 210. A microcomputer 213 is connected to the gate of the switching element 212 and the microcomputer 213 is connected. A constant voltage power supply unit 126 for applying a voltage to the constant voltage power supply unit 126 and a voltage dividing unit 126 for controlling the voltage to the constant voltage power supply unit 125 are provided.

  The switching element 212 is composed of an N channel type MOSFET. The drain of the switching element 212 is connected to one end of the detection resistor 214, the source is connected to the VL terminal side of the LED lamp 200, and the gate is connected to the microcomputer 213.

  The microcomputer 213 includes a processor and the like, and includes a CS terminal connected between the plurality of LED elements 122 and the resistance unit 223 and a GATE terminal connected to the gate of the switching element 212.

  The detection resistor 214 is connected to the cathode side of the plurality of LED elements 122 and is loaded with a current equivalent to that of the LED elements 122.

Next, the lighting operation of the LED lamp 200 will be described.
The LED lamp 200 is lit by being supplied with a constant voltage via a power supply socket 20 from a lighting device 20 (not shown) provided in the main body 1.

  A constant voltage lighting device supplied with power from a commercial power source or the like is a voltage corresponding to the forward voltage Vf of the plurality of LED elements 122 while keeping the output voltage constant for the plurality of LED elements 122 connected in series. Is applied to the voltage divider 126.

  The voltage divider 126 divides the forward voltage Vf applied by the constant voltage lighting device into a voltage desired by the microcomputer 213 from the first resistor 126a and the second resistor 126b, and supplies the voltage to the constant voltage power supply 125. Apply.

  The constant voltage power supply unit 125 controls the voltage applied from the voltage dividing unit 126 by the NPN transistor 125 b and applies a constant voltage to the microcomputer 213.

  The microcomputer 213 observes the voltage value applied to the detection resistor 214 at the CS terminal, and starts application of a set voltage to the gate of the switching element 212 if the voltage value is a predetermined voltage value.

  When application of the set voltage to the gate of the switching element 212 is started, the switching element 212 connects the drain and the source, and the LED lamp 200 starts lighting.

Next, the operation of the microcomputer 213 when a failure occurs in the LED element 122 constituting the LED lamp 200 will be described.
The microcomputer 213 detects fluctuations in the voltage applied to the detection resistor 214 from the CS terminal and controls the operation of the switching element 212.

  For example, when a short circuit occurs in one of the LED elements 122 constituting the LED lamp 200. Since the forward voltage of the plurality of LED elements 122 is reduced by Vf of the shorted LED element 122, the voltage applied to the detection resistor 214 is increased by Vf of the shorted LED element 122. The microcomputer 213 detects amplification of the voltage applied to the detection resistor 214, stops application of the set voltage to the switching element 212, and turns off the LED lamp 200.

In the present embodiment, the LED lamp 200 controls the operation of the LED elements 212 connected in series, the detection resistor unit 214 connected to the cathode side of the plurality of LED elements 122, the switching element 212, and the switching element 212. The LED lamp 200 controls the operation of the switching element 212 by detecting the fluctuation of the voltage applied to the detection resistor 214.
Therefore, the LED lamp 200 that is lit by being supplied with a constant voltage detects a failure / failure such as a short circuit that has occurred inside the LED lamp 200 even if the connected device does not include a failure detection unit, an output stop unit, etc. Can be controlled.

  In the present embodiment, the lighting device 20 has been described with respect to a configuration including a transformer, a diode bridge, a capacitor, a control IC, and the like. However, the lighting device 20 may be a constant voltage power source that keeps the voltage applied to the LED lamp 200 constant. That's fine.

1000 lighting fixture, 1 main body, 1a upper surface of main body, 10 lighting device, 11 diode bridge, 12 capacitor, 13 switching element, 14 current limiting resistor 15 control IC, 20 power supply socket, 21 power supply socket main body, 22 power supply terminal , 30 holding socket, 31 holding socket body, 100 LED lamp, 110 tube tube, 120 LED board, 121 board, 122 LED element, 123 switching element, 124 microcomputer, 125 constant voltage power supply part, 126 voltage dividing part, 126a 1st resistance part, 126b 2nd resistance part, 130 Heat radiation part, 140 Power supply base, 141 Power supply base body part, 142 L-shaped pin, 150 Holding base, 151 Holding base body part, 152 Holding pin, 200 LED lamp, 210 LED board, 211 board, 212 switching element Child, 213 microcomputer, 214 detection resistor.

Claims (7)

A plurality of light emitting elements connected in series;
A voltage divider connected in parallel to the plurality of light emitting elements;
A control unit that detects a fluctuation in a forward voltage applied to the plurality of light emitting elements by applying a divided voltage divided by the voltage dividing unit;
An opening / closing part connected in series with the plurality of light emitting elements and controlled by the control unit;
A light source unit comprising:   2. The light source unit according to claim 1, wherein the plurality of light emitting elements emit light when a predetermined current is supplied, and the control unit observes the divided voltage and detects a change in the forward voltage.   The light source unit according to claim 2, wherein the predetermined current is a constant current supplied from a lighting device to which the light source unit is connected.   A detection unit is connected between the plurality of light emitting elements and the opening / closing unit, the plurality of light emitting elements emit light by applying a predetermined voltage, and the control unit observes an applied voltage of the detection unit and performs the forward direction. The light source unit according to claim 1, wherein a change in voltage is detected.   The light source unit according to claim 4, wherein the predetermined voltage is a constant voltage applied from a lighting device to which the light source unit is connected.   The light source unit according to claim 1, wherein the control unit includes a recording unit that records a time during which power is supplied to the light emitting unit. A light source unit according to any one of claims 1 to 6,
A socket for detachably holding the light source unit;
A lighting device for supplying power to the light source unit via the socket;
The socket, and the instrument body in which the lighting device is disposed;
A lighting apparatus comprising: