JP5334297B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture in which temperature detection means is provided inside a discharge lamp lighting device, and the output of the discharge lamp is controlled by the temperature detection means.

A conventional lighting fixture includes a discharge lamp lighting device in order to control the output voltage of a fluorescent lamp being turned on to a substantially constant value corresponding to an arbitrary dimming level.
In this discharge lamp lighting device, a DC voltage obtained by a DC current is converted into a high-frequency rectangular wave voltage by a high-frequency switching operation of the half-bridge inverter, and is output to the midpoint of the half-bridge.
The output rectangular wave voltage is input to the LC resonance circuit to generate a substantially sinusoidal voltage due to resonance, and the generated voltage is applied to a lamp (hereinafter referred to as “fluorescent lamp”), and the fluorescent lamp is turned on. .

At this time, the circuit current generated in the half-bridge inverter is converted into a voltage by a fixed resistor and fed back to the control unit.
Based on the fed back voltage, the control unit controls the switching signal so as to correspond to the magnitude corresponding to the dimming signal input from the dimming signal generation unit.
Thereby, it is possible to control the output voltage of the fluorescent lamp being turned on to a substantially constant value corresponding to an arbitrary dimming level.

In this discharge lamp lighting device, it is known that the fluorescent lamp lamp disappears or flickers at the time of deep dimming lighting when the ambient temperature is low, and the luminous flux of the fluorescent lamp lamp decreases.
Further, it is known that the mercury vapor pressure enclosed in the glass tube of the fluorescent lamp does not increase at low temperatures, so that the luminous effect is reduced and the luminous flux of the fluorescent lamp is significantly reduced.

As a lighting fixture that solves these problems, low-temperature conditions are detected using temperature sensing elements (temperature detection means), and the feedback signal and dimming signal are switched at low temperatures to increase lamp output at low temperatures. Proposals have been made to avoid the occurrence of flickering or flickering of the fluorescent lamp and the reduction of the luminous flux of the fluorescent lamp (for example, see Patent Documents 1 and 2).
Here, as shown in FIG. 13, the lighting apparatus 100 of Patent Document 2 has a lighting device 102 disposed at the center of a straight tube type two lamp 101.

In this way, among lighting fixtures that increase lamp output at low temperatures, when the ambient temperature is high, the output is suppressed and the lamp output is excessively reduced, causing the fluorescent lamp to disappear or flicker. There is.
Therefore, in order to avoid the extinction or flickering of the fluorescent lamp lamp when the ambient temperature is high, the lamp output is excessively reduced, and a lighting fixture that increases the output at a high temperature has been proposed (for example, Patent Document 3). reference).
Here, as shown in FIGS. 14A and 14B, the lighting apparatus 110 of Patent Document 3 has a lighting device 112 disposed inside the inner diameter of the annular discharge lamp 111.

Japanese Patent Laid-Open No. 3-116695 JP-A-5-89992 JP 2007-5264 A

As described above, the luminaires of Patent Documents 1 to 3 use a temperature sensing element (temperature detection means) to increase the dimming output at low temperatures and suppress the occurrence of extinction and flickering.
Here, the temperature sensing element (temperature detection means) of Patent Documents 1 to 3 is not intended to detect the temperature state of the discharge lamp lighting device, but detects the temperature state of the fluorescent lamp lamp and detects the temperature state of the discharge lamp lighting device. The purpose is to control the output.
However, in the lighting fixtures of Patent Documents 1 to 3, the positional relationship between the temperature sensing element (temperature detection means) and the fluorescent lamp lamp has not been sufficiently studied so as to detect the temperature state of the fluorescent lamp lamp satisfactorily.
For this reason, it has been considered difficult to satisfactorily suppress the occurrence of flickering and extinction of the fluorescent lamp lamp due to the influence of the temperature of the fluorescent lamp (discharge lamp) itself.

  The object of the present invention has been made in view of the above-mentioned conventional problems, and in the case of deep dimming lighting, the occurrence of flickering or extinction of the discharge lamp due to the influence of the temperature of the discharge lamp itself is well suppressed. It is an object to provide a lighting device that can be used.

The present invention provides a lighting fixture in which a temperature detection means is provided inside a discharge lamp lighting device, and the output of the annular discharge lamp is controlled by the temperature detection means, wherein the discharge lighting device converts an AC voltage into a DC voltage. An AC-DC converter, an inverter circuit that converts a DC voltage output from the AC-DC converter into a high-frequency voltage, a dimming signal generator that generates a dimming signal, and a dimming signal generator A control unit that controls the operation of the inverter circuit based on the dimming signal that is output, and the temperature detection means includes a temperature-sensitive resistor whose resistance value changes when the temperature changes, The temperature sensitive resistor is used as a resistance element of a circuit that generates the dimming signal in the dimming signal generation unit, and the AC-DC conversion circuit includes an electrolytic capacitor as a smoothing capacitor, and the temperature sensing resistor resistance Is provided at a position on the upper side of the annular discharge lamp and overlapping the annular discharge lamp in plan view, and the electrolytic capacitor is located on the upper side of the annular discharge lamp in the plan view. It is provided inside the annular discharge lamp or outside the annular discharge lamp, which is a position not overlapping with the discharge lamp .

Here, in order to detect the temperature state of the discharge lamp as a load by providing temperature detection means and thereby control the output of the discharge lamp lighting device, it is desirable to place the temperature detection means adjacent to the discharge lamp itself. .
However, when the temperature detection means is adjacent to the discharge lamp itself, the method of exchanging the discharge lamp becomes complicated or the structure of the lighting fixture becomes complicated during the life of the discharge lamp. For this reason, it has been suggested that the temperature detection means is mounted on the printed circuit board in the discharge lamp lighting device.

  By the way, the radiant heat which a discharge lamp emits tends to be transmitted upwards of a discharge lamp. Therefore, in the construction state of the lighting fixture, the discharge lamp lighting device is provided in the lighting fixture so that the temperature detection means (such as a temperature sensing element) is arranged in the upper direction (upper part) of the discharge lamp. Correlation of temperature state with the electric lamp can be enhanced.

That is, when it is necessary to increase the output of the discharge lamp lighting device, it is possible to suppress problems such as not increasing so much or increasing the output more than necessary.
Thereby, it is possible to appropriately suppress the occurrence of flickering or extinction of the discharge lamp due to the influence of the temperature of the discharge lamp itself.
Therefore, in the present invention, the discharge lamp lighting device is arranged so that the temperature detection means is positioned above the discharge lamp in the usage state of the lighting fixture.

Here, it is known that the lifetime of the electrolytic capacitor is greatly influenced by the operating temperature, and that the lifetime can be extended as the temperature decreases.
Therefore, in the present invention, an electrolytic capacitor is provided in the discharge lamp lighting device, and the electrolytic capacitor is disposed in a portion that does not overlap the discharge lamp.

Furthermore, the present invention provides the discharge lamp, the discharge path is formed in a tubular, Ri fluorescent lamp der discharge path is pivoted double spiral around a longitudinal central portion of the tubular, wherein the electrolytic capacitor characterized that you have provided outside the discharge lamp of the annular.

Then, the present invention, the electrolytic capacitor is arranged me along the outer periphery of the discharge lamp of the annular.

  Moreover, the present invention is characterized in that the lighting fixture is used by being attached to a ceiling.

In the present invention, the discharge lamp lighting device is arranged so that the temperature detecting means is located above the discharge lamp in the usage state of the lighting fixture.
Therefore, when it is necessary to increase the output of the discharge lamp lighting device, it is possible to suppress problems such as not increasing so much or increasing the output more than necessary.
Thereby, when performing dimming lighting, it is possible to satisfactorily suppress occurrence of flickering or extinction of the discharge lamp due to the influence of the temperature of the discharge lamp itself.

In the present invention, the discharge lamp lighting device is provided with an electrolytic capacitor, and the electrolytic capacitor is disposed in a portion that does not overlap the discharge lamp.
As a result, the electrolytic capacitor, which is a long-life component, can be made less susceptible to the radiant heat of the lamp, so that the life of the discharge lamp lighting device can be extended, and the lighting fixture can be made thinner.

Furthermore, in the present invention, the discharge path of the discharge lamp is formed in a tubular shape, and the tubular discharge path is swirled in a double spiral shape around the central portion in the longitudinal direction.
Therefore, normally, in order to avoid the temperature rise of the discharge lamp lighting device or to make the lighting fixture thin, the discharge lamp lighting device is arranged so as not to overlap with the discharge lamp (avoid the upper portion of the discharge lamp). .
Here, by arranging the discharge lamp lighting device so as to position the temperature detecting means above the discharge lamp, it is possible to suppress the occurrence of flickering or extinguishing of the discharge lamp due to the influence of the temperature of the discharge lamp itself.

In the present invention, the discharge lamp lighting device is arranged along the outer peripheral portion of the discharge lamp.
Thereby, even if it makes the shape which swirled the discharge lamp into double spiral shape, thickness reduction of a lighting fixture can be achieved, and also it can suppress that the flicker of a discharge lamp, disappearance, etc. generate | occur | produce.

Moreover, in this invention, a discharge lamp irradiates toward the other side of a ceiling (namely, downward) by attaching and using a lighting fixture on a ceiling.
On the other hand, the discharge lighting device is located between the discharge lamp and the ceiling in a state where the discharge lighting device is disposed on the upper portion of the discharge lamp.
Thereby, since the discharge lighting device can be arranged on the opposite side of the irradiation direction of the discharge lamp, the desired position can be efficiently irradiated with the discharge lamp.

(A) is a side view which shows the lighting fixture (1st Embodiment) which concerns on this invention, (B) is AA sectional view taken on the line. A circuit diagram showing a discharge lighting device of a first embodiment The circuit diagram which shows the control part of 1st Embodiment The circuit diagram which shows the light control signal production | generation part of 1st Embodiment A graph showing the relationship between the on-duty ratio of the dimming signal generator and the dimming signal The top view which shows the lighting fixture (2nd Embodiment) which concerns on this invention (A) is a side view which shows the lighting fixture (3rd Embodiment) which concerns on this invention, (B) is BB sectional drawing. The circuit diagram which shows the discharge lighting device of 3rd Embodiment The circuit diagram which shows the light control signal production | generation part of 3rd Embodiment (A) is a side view which shows the lighting fixture (4th Embodiment) which concerns on this invention, (B) is CC sectional view taken on the line. (A) is a side view which shows the lighting fixture (5th Embodiment) which concerns on this invention, (B) is DD sectional view taken on the line. (A) is a side view showing a lighting fixture (sixth embodiment) according to the present invention, and (B) is a cross-sectional view taken along the line EE. Sectional drawing showing a conventional lighting fixture (A) is a perspective view which shows another lighting fixture, (B) is sectional drawing which shows the lighting fixture of (A).

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
The lighting fixture 10 which concerns on 1st Embodiment is demonstrated.
As shown in FIGS. 1A and 1B, a lighting fixture 10 includes a circular fixture body 12 attached to a ceiling 11, a discharge lamp lighting device 13 provided on the fixture body 12, and a discharge lamp lighting device. 13, a reflecting plate 14 covering the reflecting plate 14, an annular fluorescent lamp (discharge lamp) 15 attached to the reflecting plate 14, and a translucent light transmitting cover 16 covering the reflecting plate 14 and the fluorescent lamp lamp 15.

  As shown in FIG. 2, the discharge lamp lighting device 13 includes a DC power source 21, a half bridge inverter 22 connected to the output side thereof, a control unit 23 that controls switching signals A 1 and A 2, and a half bridge inverter 22. A dimming signal that is connected to the midpoint and connected to the fluorescent lamp 15 and a dimming signal S1 generated according to a dimming level signal 25 from the outside and input to the control unit 23 A generator 26 and a fixed resistor 27 that converts the current flowing through the half-bridge inverter 22 into a voltage and inputs the voltage to the controller 23 are provided.

The operation of the discharge lamp lighting device 13 will be described below.
The DC voltage obtained from the DC power supply 21 is converted into a high-frequency rectangular wave voltage by the high-frequency switching operation of the half-bridge inverter 22 connected to both ends thereof, and is output to the midpoint of the half-bridge inverter 22.
When this rectangular wave voltage is input to the LC resonance circuit 24, a substantially sinusoidal voltage is generated due to the resonance action, applied to both ends of the fluorescent lamp lamp 15, and the fluorescent lamp lamp 15 is turned on.

At this time, the circuit current generated in the half-bridge inverter 22 is converted to the voltage B 1 by the fixed resistor 27 and fed back to the control unit 23.
In the control unit 23, the switching signal is controlled so that the fed back voltage B1 has a magnitude corresponding to the dimming signal S1 input from the dimming signal generation unit 26.
Thereby, the output voltage of the fluorescent lamp 15 being turned on is controlled to a substantially constant value corresponding to the arbitrary dimming level signal 25.

As shown in FIG. 3, the control unit 23 sets the source oscillation frequency of the high-frequency switching operation of the half-bridge inverter 22 and outputs the switching signals A1 and A2 (for example, a known inverter driving IC), It is composed of a fixed resistor R8, a capacitor C3, an operational amplifier OP1, a diode D1, fixed resistors R5 to R7, and a capacitor C2.
The operational amplifier OP1, the diode D1, the fixed resistors R5 to R7, and the capacitor C2 are switched so that the feedback voltage B1 has a magnitude corresponding to the dimming signal S1 input from the dimming signal generation unit 26 (see FIG. 2). Controls the signal.

The oscillation unit 31 is provided with a fixed resistor R8 and a capacitor C3 for setting a source oscillation frequency. A reference current value is set by the fixed resistor R8, and the charge / discharge cycle of the capacitor C3 is set according to the reference current value. This period is set as the source oscillation frequency, which is reflected in the switching signals A1 and A2 and output.
The dimming signal S1 from the dimming signal generator 26 is input to the non-inverting input terminal of the operational amplifier OP1, and the feedback voltage B1 is input to the inverting input terminal via the fixed resistor R5. The fixed resistors R5 and R6 The capacitor C2 is provided for setting the gain of the feedback operation.

The output terminal voltage value of the operational amplifier OP1 changes according to the difference between the dimming signal S1 and the feedback voltage B1, and this change changes the amount of current flowing through the fixed resistor R7 and the diode D1. Therefore, when the reference current value of the oscillating unit 31 changes and the oscillation frequency of the half-bridge inverter 22 changes, the operation at the oscillation frequency at which the dimming signal S1 and the feedback voltage B1 are substantially constant is continued.
Thereby, the output voltage of the fluorescent lamp 15 being turned on can be controlled to a substantially constant value corresponding to the arbitrary dimming level signal 25.

The dimming signal generator 26 shown in FIG. 4 is provided inside the discharge lamp lighting device via a printed circuit board (not shown).
The dimming signal generator 26 is a reference voltage Vcc, fixed resistors R1 to R4, a capacitor C1 and a switch element Q1, and a thermistor NTC1 of a NTC type (a resistance value decreases as the temperature rises) as temperature detecting means. It is configured.

The dimming signal generator 26 controls the charge / discharge current value of the capacitor C1 by turning on / off the switch element Q1 according to the dimming level signal 25 from the outside, and as a result, the voltage across the capacitor C1 is dimmed. A direct current corresponding to the level signal 25 is obtained, and this voltage value becomes the dimming signal S1.
The dimming level signal 25 is a pulse signal with a fixed period, and the ON / OFF period of the switch element Q1 is changed by arbitrarily changing the ON width of the pulse according to the dimming level, and the charge / discharge of the capacitor C1 As the current value changes, the value of the dimming signal S1 can also change.
The operation of the thermistor NTC1 will be described later.

FIG. 5 shows the on-duty ratio of the dimming level signal input to the dimming signal generation unit 26 (ratio of the period during which the switch element Q1 is turned on with respect to one cycle period of the dimming level signal) and the dimming signal generation unit 26 output. The graph showing the relationship of the light control signal S1 to perform is shown.
The dimming signal S1 increases when the on-duty ratio of the dimming level signal is small, and the dimming signal S1 decreases when the on-duty ratio of the dimming level signal 25 is large.
In this way, the dimming signal S1 corresponding to the dimming level can be obtained by setting the dimming level range (maximum lighting output to minimum lighting output range) on-duty ratio.

Here, the dimming signal generator 26 is provided with a thermistor NTC1. Therefore, the dimming signal S1 output from the dimming signal generation unit 26 is equal to the dimming level when the switch element Q1 is turned on / off according to the dimming level signal 25 from the outside at low temperatures. A large value is obtained with the thermistor NTC1.
In other words, even if the dimming level signal 25 is the same, the output of the discharge lamp lighting device 13 is controlled to increase as the temperature decreases.

  As shown in FIGS. 1A and 1B, the luminaire 10 is used by being attached to the ceiling 11 (that is, when the luminaire 10 is in use), so that the thermistor NTC1 in the discharge lamp lighting device 13 is used. The discharge lamp lighting device 13 is arranged so that is positioned above the fluorescent lamp 15.

By using the lighting fixture 10 attached to the ceiling 11, the fluorescent lamp 15 is irradiated toward the opposite side of the ceiling 11 (that is, downward).
On the other hand, the discharge lamp lighting device 13 is positioned between the fluorescent lamp lamp 15 and the ceiling 11 in a state where the discharge lamp lighting device 13 is arranged on the upper part of the fluorescent lamp lamp 15.
Thereby, since the discharge lamp lighting device 13 can be disposed on the opposite side of the irradiation direction of the fluorescent lamp 15, the lower desired position can be efficiently irradiated with the fluorescent lamp 15.

Furthermore, by disposing the discharge lamp lighting device 13 so that the thermistor NTC1 is positioned above the fluorescent lamp 15 in the usage state of the lighting fixture 10, the output of the discharge lamp lighting device 13 can be controlled with high accuracy. .
Specifically, when it is necessary to increase the output of the discharge lamp lighting device 13, it is possible to suppress problems such as not increasing so much or increasing the output more than necessary.
Thereby, when the dimming lighting of the fluorescent lamp 15 is performed, it is possible to suppress the occurrence of flickering or extinction of the thermistor NTC1 due to the influence of the temperature of the fluorescent lamp 15 itself.

  Next, second to sixth embodiments will be described with reference to FIGS. In addition, in 2nd Embodiment-6th Embodiment, the same code | symbol is attached | subjected about the structural member similar to 1st Embodiment, and description is abbreviate | omitted.

(Second Embodiment)
A lighting fixture 30 according to the second embodiment will be described.
As shown in FIG. 6, the lighting fixture 40 of 2nd Embodiment equips the lighting fixture 10 of 1st Embodiment with the discharge lamp lighting device 42 and the fluorescent lamp lamp (discharge lamp) 43, Other structures are the same. It is the same as the lighting fixture 10.

Similarly to the discharge lamp lighting device 13 of the first embodiment, the discharge lamp lighting device 42 includes a thermistor NTC2 of the NTC type (a resistance value decreases as the temperature rises) as temperature detection means.
The thermistor NTC2 is the same temperature detection means as the thermistor NTC1 of the first embodiment.
That is, the discharge lamp lighting device 42 plays the same role as the discharge lamp lighting device 13 of the first embodiment.

  The fluorescent lamp 43 is an annular lamp that is slightly smaller than the fluorescent lamp 15. The fluorescent lamp 43 is attached to the reflecting plate 14 (see FIG. 1A) in a state of being arranged inside the fluorescent lamp 15 of the first embodiment.

  In the lighting fixture 40, the discharge lamp lighting device 13 is disposed so that the thermistor NTC1 in the discharge lamp lighting device 13 is located above the fluorescent lamp lamp 15, and the thermistor NTC2 in the discharge lamp lighting device 42 is the fluorescent lamp lamp. A discharge lamp lighting device 42 is arranged so as to be positioned above 43.

Thereby, since the discharge lamp lighting devices 13 and 42 can be respectively arranged on the opposite side of the irradiation direction of the fluorescent lamps 15 and 43, it is possible to efficiently irradiate the lower desired position with the fluorescent lamps 15 and 43.
Furthermore, when the lighting fixture 40 is in use, the discharge lamp lighting devices 13 and 42 are arranged so that the thermistors NTC1 and NTC2 are positioned above the fluorescent lamps 15 and 43, so that the outputs of the discharge lamp lighting devices 13 and 42 are output. Can be accurately controlled.
Thereby, when the dimming lighting of the fluorescent lamps 15 and 43 is performed, it is possible to prevent the thermistors NTC1 and NTC2 from flickering or disappearing due to the influence of the temperature of the fluorescent lamps 15 and 43 themselves.

(Third embodiment)
A lighting apparatus 50 according to the third embodiment will be described.
As shown in FIGS. 7A and 7B, the lighting fixture 50 of the third embodiment includes a discharge lamp lighting device 52 instead of the discharge lamp lighting device 13 of the first embodiment. The configuration is the same as that of the lighting fixture 10.

As shown in FIG. 8, the discharge lamp lighting device 52 includes a commercial power supply 53 instead of the DC power supply 21 of the first embodiment, and includes an AC-DC conversion unit 54 that converts an AC voltage into a DC voltage. A dimming signal generation unit 55 is provided instead of the signal generation unit 26, and other configurations are the same as those of the lighting fixture 10.
This discharge lamp lighting device 52 is the same as the discharge lamp lighting device 13 of the first embodiment with respect to the operation after the AC voltage is converted into the DC voltage by the AC-DC converter 54.

The AC-DC converter 54 is composed of a step-up chopper and is controlled by a chopper controller 56 to operate. This operation is a general well-known technique and will not be described in detail.
The voltage converted into direct current by the boost chopper is smoothed by the electrolytic capacitor C2. Since the capacity of the electrolytic capacitor C2 is determined by the fluorescent lamp 15 as a load, relatively large-sized parts are used for lighting that brightens the entire room.

As shown in FIG. 9, the dimming signal generation unit 55 is configured by an NTC type thermistor NTC1 as temperature detection means, as in the first embodiment.
The switch element Q1 is turned on / off in accordance with the dimming level signal 25 from the outside. In addition, the fixed resistors R5 and R6 and the thermistor NTC1 output the DC voltage that changes depending on the temperature and the voltage of the capacitor C1 to the capacitor C2 in an OR configuration with the diodes D1 and D2, and dimming the higher voltage Output as signal S1.
Thus, below a certain level, even if the dimming level signal 25 is the same, the output of the discharge lamp lighting device 52 is controlled to increase as the temperature decreases.

The lighting fixture 50 shown to FIG. 7 (A) and (B) is provided with the circular fixture main body 12 and the cyclic | annular fluorescent lamp 15 as a discharge lamp similarly to the lighting fixture 10 of 1st Embodiment.
Further, the discharge lamp lighting device 52 is arranged so that the thermistor NTC1 in the discharge lamp lighting device 52 overlaps the fluorescent lamp 15. Further, the large portion 52 a including the capacitor C <b> 2 is disposed so as to fit inside the fluorescent lamp 15.

  As a result, the lighting fixture 50 can be made thinner than the lighting fixture 10 of the first embodiment, and the capacitor (electrolytic capacitor) C2, which is a long-life component, can be made less susceptible to the radiant heat of the fluorescent lamp 15, so that it can be released. The life of the lamp lighting device 52 can be extended.

Furthermore, the discharge lamp lighting device 13 is arranged so that the thermistor NTC1 is positioned above the fluorescent lamp 15 in the usage state of the lighting fixture 50.
Therefore, it is possible to reduce the thickness of the lighting fixture 50 and extend the life of the discharge lamp lighting device 52, and to control the output of the discharge lamp lighting device 13 with high accuracy, and the influence of the temperature of the fluorescent lamp lamp 15 itself. It is possible to suppress the occurrence of flickering or disappearance of the thermistor NTC1.

(Fourth embodiment)
A lighting fixture 60 according to the fourth embodiment will be described.
As shown in FIGS. 10A and 10B, the luminaire 60 of the fourth embodiment includes a fluorescent lamp 62 instead of the fluorescent lamp 15 of the first embodiment, and the other configurations are as follows. It is the same as the lighting fixture 10.
The fluorescent lamp 62 is a fluorescent lamp in which a discharge path 63 is formed in a tubular shape, and the tubular discharge path 63 is swirled in a double spiral shape with a central portion in the longitudinal direction as a center.

Here, in the case of the annular fluorescent lamp 15 shown in the first embodiment, the inside of the inside of the fluorescent lamp 15, the outside of the outside, and the upper part exist as places where the discharge lamp lighting device 13 is arranged.
On the other hand, when the discharge path 63 is swirled in a double spiral shape as in the fluorescent lamp lamp 62 of the fourth embodiment, a space cannot be secured inside the fluorescent lamp lamp 62, and therefore, the outer shape of the fluorescent lamp lamp 62 and the upper part It is conceivable to dispose the discharge lamp lighting device 13 in the above.
However, when the discharge lamp lighting device 13 is arranged outside the outer shape of the fluorescent lamp lamp 62, the difference between the fluorescent lamp lamp 62 and the temperature becomes large.

Therefore, the thermistor NTC1 of the discharge lamp lighting device 13 is arranged above the fluorescent lamp lamp 62.
Therefore, the thermistor NTC1 can be disposed at a position that is easily affected by the radiant heat of the fluorescent lamp lamp 62, and the output of the discharge lamp lighting device 13 can be accurately controlled by the temperature of the fluorescent lamp lamp 62.
Thereby, it is possible to suppress the occurrence of flickering or extinction of the fluorescent lamp lamp 62 due to the influence of the temperature of the fluorescent lamp lamp 62 itself.

(Fifth embodiment)
A lighting apparatus 70 according to the fifth embodiment will be described.
As shown in FIGS. 11A and 11B, a lighting fixture 70 of the fifth embodiment includes a discharge lamp lighting device 72 instead of the discharge lamp lighting device 13 of the fourth embodiment. The configuration is the same as that of the lighting fixture 60.
In this lighting fixture 70, the discharge lamp lighting device 72 is arranged so that the thermistor NTC 1 in the discharge lamp lighting device 72 is located above the fluorescent lamp lamp 62.
Further, the large portion 72 a including the capacitor C <b> 2 is disposed on the outside (that is, the outer peripheral portion) 62 a of the outer diameter of the fluorescent lamp 62.

As a result, the lighting fixture 70 can be made thinner than the lighting fixture 60 of the fourth embodiment, and the capacitor (electrolytic capacitor) C2, which is a long-life component, can be made less susceptible to the radiant heat of the fluorescent lamp lamp 62. The life of the discharge lamp lighting device 72 can be extended.
Furthermore, as shown in FIG. 11 (A), the outer periphery of the lighting fixture 70 can be kept compact by forming the large portion 72a including the capacitor C2 on the curve along the outer periphery 62a of the fluorescent lamp 62. it can.

Further, the discharge lamp lighting device 72 is arranged so that the thermistor NTC1 is positioned above the fluorescent lamp lamp 62 in the usage state of the lighting fixture 70.
Accordingly, the lighting fixture 70 can be made thinner and more compact, the life of the discharge lamp lighting device 72 can be extended, and the output of the discharge lamp lighting device 72 can be accurately controlled. The occurrence of flickering or disappearance of the thermistor NTC1 due to the influence of temperature can be suppressed.

(Sixth embodiment)
A lighting fixture 80 according to the sixth embodiment will be described.
As shown in FIGS. 12A and 12B, in the luminaire 80 of the sixth embodiment, the thermistor NTC1 in the discharge lamp lighting device 13 overlaps the filament portion 15a on the upper portion of the filament portion 15a of the fluorescent lamp 15. Other configurations are the same as those of the lighting fixture 10 of the first embodiment.

Here, in the fluorescent lamp 15, the temperature rise of the filament portion 15a is large.
Therefore, it becomes possible to control the output of the discharge lamp lighting device 13 with higher accuracy by the temperature of the filament portion 15a, and it is more accurate that the thermistor NTC1 flickers or disappears due to the influence of the temperature of the fluorescent lamp 15 itself. Can be well controlled.

Here, it is conceivable that problems such as abnormal heating of the filament portion 15a occur at the end of the life of the fluorescent lamp 15. Therefore, by disposing the thermistor NTC1 in the vicinity of the filament portion 15a, when the filament portion 15a is abnormally heated, the abnormality of the filament portion 15a is detected by the thermistor NTC1 and the output of the discharge lamp lighting device 13 is suppressed or reduced. It is also possible to do.
That is, the thermistor NTC1 can also be used as a known abnormality detection circuit.

In addition, the lighting fixture which concerns on this invention is not limited to embodiment mentioned above, A change, improvement, etc. are possible suitably.
For example, the ceiling 11, the discharge lamp lighting devices 13, 42, 52, 72, the fluorescent lamp lamps 15, 43, 62, the outer peripheral portion 62a, the discharge path 63, NTC1, NTC2, and the like described in the first to sixth embodiments The shape of the capacitor C2 and the like is not limited to that illustrated, and can be changed as appropriate.

10, 40, 50, 60, 70, 80 Lighting equipment 11 Ceiling 13, 42, 52, 72 Discharge lamp lighting device 15, 43, 62 Fluorescent lamp (discharge lamp)
62a Outside the outer diameter of the fluorescent lamp (outer periphery)
63 Discharge path NTC1, NTC2 thermistor (temperature detection means)
C2 capacitor (electrolytic capacitor)

Claims (4)

A temperature detection means is provided inside the discharge lamp lighting device, and the lighting fixture controls the output of the annular discharge lamp by the temperature detection means,
The discharge lighting device includes an AC-DC converter that converts an AC voltage into a DC voltage, an inverter circuit that converts a DC voltage output from the AC-DC converter into a high-frequency voltage, and a dimming signal. An optical signal generation unit, and a control unit for controlling the operation of the inverter circuit based on the dimming signal output from the dimming signal generation unit,
The temperature detecting means is composed of a temperature sensitive resistor whose resistance value changes when the temperature changes, and the temperature sensitive resistor is used as a resistance element of a circuit for generating the dimming signal in the dimming signal generating unit. Has been
The AC-DC conversion circuit includes an electrolytic capacitor as a smoothing capacitor,
The temperature sensitive resistor is provided on the upper side of the annular discharge lamp, at a position overlapping the annular discharge lamp in plan view,
The electrolytic capacitor is provided inside the annular discharge lamp or outside the annular discharge lamp at a position above the annular discharge lamp that does not overlap the annular discharge lamp in plan view. luminaire, characterized by that. The discharge lamp, the discharge path is formed in a tubular, Ri fluorescent lamp der discharge path is pivoted double spiral around a longitudinal central portion of the tubular, wherein the electrolytic capacitor, the discharge lamp of the annular lighting device according to claim 1, wherein that you have provided the outside. The electrolytic capacitor luminaire according to claim 2, characterized in that it is arranged me along the outer periphery of the discharge lamp of the annular. The luminaire luminaire according to any one of claims 1-3, characterized in that it is used attached to the ceiling.

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