JP6548111B2 - Lighting device and lighting apparatus - Google Patents

Description

  The present invention relates to a lighting device and a lighting device, and more particularly to a lighting device configured by housing a printed wiring board on which circuit components are mounted in a case, and a lighting device including the lighting device.

  As a prior art example, the lighting device for discharge lamps of patent document 1 is illustrated. The lighting device for a discharge lamp (hereinafter referred to as a conventional lighting device) described in Patent Document 1 includes a lighting device body and a metal case for housing the lighting device body. The lighting device main body is configured to form a lighting circuit for lighting the discharge lamp at a high frequency by a circuit board (printed wiring board) and a circuit component mounted on the circuit board.

  The case is comprised of a case body and a case lid. The case body is formed into a rectangular tube shape with both ends opened by extrusion molding of a metal material such as aluminum. The case lid is formed in a plate shape and attached to the open end of the case body.

  The lighting device body is supported by the case body by inserting both ends along the longitudinal direction of the circuit board into a pair of recessed grooves provided on the inner surface of the case body. Further, among the circuit components, a heat-generating component such as a switching device (for example, a field effect transistor or the like) is mounted on one end along the longitudinal direction of the circuit board and attached to the heat dissipation plate. The heat sink is formed in a long rectangular flat plate shape, and is fixed (screwed) to the circuit board by an L-shaped fixing leg projecting from one end along the longitudinal direction. Furthermore, the heat sink is screwed to the inner surface (wall) of the case body.

  The conventional lighting device improves the heat dissipation by conducting the heat generated by the heat generating component from the heat sink to the case.

JP 2008-84540 A

  By the way, in the conventional lighting device, the width of the concave groove of the case main body is larger than the thickness of the circuit board so that the circuit board can be inserted. On the other hand, since a heavy part such as a transformer (a part having a large weight compared to other circuit parts) is mounted on the circuit board, the circuit is equal to the clearance between the circuit board and the recess in the thickness direction. There is a possibility that the substrate may bend. And in the state which the circuit board bent, since stress arises in the joining location (solder) of the terminal of a circuit component, and the conductor of a circuit board, stress will be added to solder.

  This invention is made in view of the said subject, and it aims at reducing the stress added to a printed wiring board and solder.

The lighting device of the present invention includes a lighting unit for lighting a light source and a case for housing the lighting unit, and the lighting unit is configured by mounting a plurality of types of circuit components on a rectangular flat printed wiring board. Lighting circuit, a coupling member mechanically coupled to a circuit component having a relatively large amount of heat generation among the plurality of types of circuit components, and one or more metals fixed to the printed wiring board The case includes a case body formed in a cylindrical shape having an insertion port opened at at least one end, and a lid portion attached to the case body so as to close the insertion port. The case main body is provided with two grooves in the inner wall surface, and the two grooves can be separately inserted into the insertion port from the first end and the second end along the longitudinal direction of the printed wiring board And The first end and the second end after insertion are configured to be supported, and the printed wiring board is mounted with a circuit component having a relatively large amount of heat generation near the first end. And the connecting member is made of a metal plate material, and a main body to which a circuit component having a relatively large amount of heat generation is mechanically connected, and the first end of the printed wiring board projecting from the main body And one or more fixing parts fixed near the part, the main body part is configured to be mechanically coupled to the case main body, the reinforcing member is plate-like, and the printing is performed. is secured to at least a third end and a fourth end portion along the widthwise direction on the wiring board, the reinforcing member is further characterized Rukoto which having a connecting portion connected to the coupling member.

  A lighting fixture of the present invention is characterized by having a lighting device and a light source to be lit by the lighting device.

  The lighting device and the lighting fixture of the present invention have the effect of being able to reduce the stress applied to the printed wiring board and the solder.

The lighting device which concerns on this embodiment is shown, FIG. 1A is a side view in the state which removed one cover part, FIG. 1B is a XX arrow cross section arrow line view of FIG. 1A. It is the disassembled perspective view which partially abbreviate | omitted the lighting device same as the above. It is a circuit diagram of the lighting unit in the lighting device same as the above. It is a front view of the lighting unit which omitted the case in the lighting device same as the above. It is a front view of the lighting fixture concerning this embodiment. It is the perspective view seen from the back of the lighting fixture same as the above.

  Hereinafter, the lighting device and the lighting apparatus according to the present embodiment will be described with reference to the drawings. The configuration described in the following embodiment is merely an example of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made according to the design and the like without departing from the technical concept of the present invention.

  The lighting device 8 of the present embodiment has two lighting units 4 and a case 81 for housing the two lighting units 4 as shown in FIGS. 1A, 1B and 2. However, the number of lighting units 4 is not limited to two, and may be one or three or more. Also, the two lighting units 4 have the same configuration.

  The lighting unit 4 has a lighting circuit configured by mounting a plurality of types of circuit components 801 on the printed wiring board 800. First, the circuit configuration of the lighting circuit will be described with reference to FIG.

  The lighting circuit (lighting unit 4) preferably includes a buck converter 40, a control circuit 41, a first control power circuit 42, and a second control power circuit 43, as shown in FIG. Furthermore, the lighting circuit preferably includes a PFC (Power Factor Correction: power factor correction) circuit 44, a filter circuit 45, a full wave rectifier 46, a speed-up circuit 47, a PFC drive unit 48, a signal conversion circuit 49 and the like.

  The filter circuit 45 is configured to remove harmonic noise superimposed on the AC voltage / AC current supplied from the AC power supply AC and harmonic noise generated in the PFC circuit 44. The full wave rectifier 46 is formed of a diode bridge, and full-wave rectifies alternating voltage and current supplied from the alternating current power supply AC. The PFC circuit 44 is a conventionally known step-up chopper circuit, and is configured to improve the power factor by converting the pulsating current full-wave rectified by the full-wave rectifier 46 into a desired DC voltage. In the PFC circuit 44, an inductor L1, a diode D1 and a smoothing capacitor C1 are electrically connected in series between the pulsating output ends of the full wave rectifier 46, and a parallel circuit of two switching elements Q11 and Q12 is a diode D1. It is electrically connected in parallel to the smoothing capacitor C1. The two switching elements Q11 and Q12 are semiconductor switching elements (for example, N-channel power MOSFETs) having common electrical characteristics. That is, the PFC circuit 44 is configured to reduce the current flowing to the individual switching elements Q11 and Q12 and to suppress the temperature rise by providing a parallel circuit of two switching elements Q11 and Q12. However, since the PFC circuit 44 has a circuit configuration known in the prior art except that two switching elements Q11 and Q12 are connected in parallel, the detailed description of the operation is omitted. In the following description, the output voltage of the PFC circuit 44 (voltage across the smoothing capacitor C1) is referred to as a DC input voltage Vdc.

  The buck converter 40 is a switching power supply circuit also called a step-down chopper circuit. The buck converter 40 steps down several hundred volts of DC input voltage Vdc supplied from the PFC circuit 44 to several tens of volts of DC voltage (hereinafter called output voltage V1) required for the light source unit 1 described later. Configured to The buck converter 40 is preferably configured by two switching elements Q21, Q22, an inductor T1, a diode D4, a smoothing capacitor C3, and the like. The two switching elements Q21 and Q22 are electrically connected in parallel between the output terminal on the high potential side of the PFC circuit 44 and the positive electrode of the light source unit 1 via the inductor T1. The smoothing capacitor C3 is an electrolytic capacitor, and is electrically connected in parallel to the light source unit 1. The cathode of the diode D4 is electrically connected to the connection point between the parallel circuit of the switching elements Q21 and Q22 and the inductor T1, and the anode is electrically connected to the output end (ground) of the low potential side of the PFC circuit 44. Ru. The two switching elements Q21 and Q22 are semiconductor switching elements (for example, N-channel power MOSFETs) having common electrical characteristics. Preferably, a detection resistor R8 is electrically connected between the anode of the diode D4 and the low potential side terminal of the smoothing capacitor C3. However, except for the point that the two switching elements Q21 and Q22 are connected in parallel, the buck converter 40 has a circuit configuration known in the prior art, so detailed description of the operation will be omitted.

  The first control power supply circuit 42 is configured to convert several hundred volts of DC input voltage Vdc into ten and several volts (for example, fifteen volts) of DC voltage (hereinafter, referred to as first control power supply voltage Vcc). Ru. The first control power supply circuit 42 is preferably configured by a switching power supply circuit such as a buck converter or a flyback converter.

  Here, the lighting circuit is provided with a bootstrap circuit known in the prior art. The bootstrap circuit is configured by a bootstrap diode D2, a bootstrap capacitor C2, and a series circuit of a plurality of resistors R2 to R6 (hereinafter referred to as a resistor series circuit). The first control power supply voltage Vcc is applied to the anode of the bootstrap diode D2, and one end of the bootstrap capacitor C2 is electrically connected to the cathode. The other end of the bootstrap capacitor C2 is electrically connected to the ground via a resistor series circuit. Furthermore, the resistors R3 to R6 are electrically connected in parallel to the diode D4 of the buck converter 40. The bootstrap circuit is configured to charge the bootstrap capacitor C2 with the first control power supply voltage Vcc during the off period of the switching elements Q21 and Q22 of the buck converter 40. Then, the bootstrap capacitor C2 is charged, whereby the drive voltage HVcc of the switching elements Q21 and Q22 can be obtained from the terminal on the high potential side of the bootstrap capacitor C2.

  The second control power supply circuit 43 preferably includes a resistor R7, a diode D3 and a zener diode ZD1. One end of the resistor R7 is electrically connected to the output terminal on the high potential side of the PFC circuit 44, and the other end of the resistor R7 is electrically connected to the cathode of the Zener diode ZD1 and the anode of the diode D3. The anode of the Zener diode ZD1 is electrically connected to the cathode of the diode D4 of the buck converter 40. The cathode of the diode D3 is electrically connected to the terminal on the high potential side of the bootstrap capacitor C2.

  The control circuit 41 is configured to execute a first control operation to control the PFC circuit 44 and a second control operation to control the buck converter 40. It is preferable that such a control circuit 41 be configured as an integrated circuit including, for example, a circuit that performs the first control operation and a circuit that performs the second control operation.

  In the first control operation, the control circuit 41 is preferably operated to maintain the DC input voltage Vdc at a desired target value (for example, a voltage of about 400 volts). That is, the control circuit 41 measures the DC input voltage Vdc by the resistance voltage dividing circuit (series circuit of the resistors R1 and R2), and based on the measured value, makes the DC input voltage Vdc match the target value. It is preferable to adjust the on-duty ratio. The PWM signal is output to the PFC driver 48. Preferably, the PFC driver 48 simultaneously drives the two switching elements Q11 and Q12 on and off according to the PWM signal.

  In the second control operation, it is preferable to operate the control circuit 41 so that the current (load current) I1 to be supplied to the light source unit 1 matches the target value. That is, the control circuit 41 measures the load current I1 from the voltage across the detection resistor R8, and adjusts the on-duty ratio of the PWM signal so that the load current I1 matches the target value based on the measured value. preferable. The control circuit 41 may adjust the target value of the load current I1 according to an externally applied control signal (light adjustment signal) to adjust the light source unit 1 or turn off the light.

  Here, the drive signal of control circuit 41 is applied to the gates of switching elements Q21 and Q22 of buck converter 40 through speed-up circuit 47, respectively. Each speed-up circuit 47 is preferably configured by a PNP bipolar transistor Tr1, a diode D5, resistors R17 to R19, and the like (see FIG. 3). The resistor R17 is electrically connected between the gate and the source of each of the switching elements Q21 and Q22. The emitter of bipolar transistor Tr1 is electrically connected to the gates of switching elements Q21 and Q22, and the collector of bipolar transistor Tr1 is electrically connected to the sources of switching elements Q21 and Q22 via resistor R18. The base of bipolar transistor Tr1 is electrically connected to the anode of diode D5 and one end of resistor R19, and the other ends of resistor R19 of each speed-up circuit 47 are electrically connected to output terminal Ho of control circuit 41. Ru.

  In each speed-up circuit 47, when the high level drive signal is input from the output terminal Ho, the bipolar transistor Tr1 is turned off, and the drive voltage HVcc is applied between the gate and source of the switching elements Q21 and Q22 through the resistor R17. Apply to turn on. Further, when the drive signal from the output terminal Ho is stopped, each speed-up circuit 47 turns on the bipolar transistor Tr1, and discharges the charge accumulated in the gates of the switching elements Q21 and Q22 to turn it off. That is, each speed-up circuit 47 is configured to accelerate the turn-on of the switching elements Q21 and Q22 formed of power MOSFETs.

  Further, in the second control operation, the control circuit 41 determines the timing to output the high level drive signal from the output terminal Ho based on the voltage (detection voltage) induced in the inductor T2 magnetically coupled to the inductor T1 in the second control operation. doing. For example, it is preferable that the control circuit 41 is configured to detect the zero cross of the current (inductor current) flowing through the inductor T1 based on the detected voltage, and to output the drive signal in synchronization with the zero cross.

  Preferably, the signal conversion circuit 49 is configured to convert a control signal (a dimming signal formed of a PWM signal) supplied from the outside into a DC voltage signal and output the converted signal to the control circuit 41. The signal level (DC voltage level) of the voltage signal output from the signal conversion circuit 49 corresponds to the output level (light control level) indicated by the control signal. The control circuit 41 preferably adjusts the target value to a value corresponding to the signal level (dimming level) of the voltage signal output from the signal conversion circuit 49.

  Preferably, the lighting circuit comprises a timer circuit. The timer circuit is preferably configured by a CR integration circuit of resistors R13 to R15 and a capacitor C4, as shown in FIG. The timer circuit is configured such that a series circuit of resistors R13 to R15 is electrically connected in parallel to the smoothing capacitor C3 and the detection resistor R8, and a low side resistor R15 and a capacitor C4 are electrically connected in parallel. Since the voltage across the capacitor C4 gradually rises from the time when the AC power supply AC is switched on, the control circuit 41 uses the voltage across the capacitor C4 (hereinafter referred to as a timer signal) to measure the elapsed time from the closing time. I can know. Preferably, a series circuit of resistors R9 to R12 is electrically connected in parallel to the timer circuit.

  Next, the basic operation of the lighting circuit will be described.

  When the AC power supply AC is turned on, the first control power supply circuit 42 is activated to generate the first control power supply voltage Vcc. When the first control power supply voltage Vcc reaches a rated value (for example, 15 volts), the control circuit 41 is activated to execute the first control operation. Preferably, the control circuit 41 monitors the elapsed time from the time of turning on the AC power supply AC based on the timer signal.

  When the control circuit 41 executes the first control operation, the PFC circuit 44 operates and the DC input voltage Vdc reaches the rated value. When the first control power supply voltage Vcc reaches the rated value, the bootstrap circuit operates normally, and a predetermined drive voltage HVcc is applied to the control circuit 41.

  The control circuit 41 starts the second control operation if it determines that a predetermined time (hereinafter referred to as a preparation period) has elapsed since the DC input voltage Vdc has reached the rated value based on the timer signal. When the control circuit 41 starts the second control operation, the output voltage V1 of the buck converter 40 gradually rises, and the load current I1 starts to flow from the time when the lighting start voltage of the light source unit 1 is exceeded. Then, the control circuit 41 controls (feedback control) the buck converter 40 such that the load current I1 has a constant value. Therefore, the lighting circuit can light the light source unit 1 with a desired brightness (light output).

  The control circuit 41 sets the output of the buck converter 40 as the lower limit when the signal level of the voltage signal output from the signal conversion circuit 49 is the maximum value, and rates the output of the buck converter 40 when the signal level is the minimum value. It is preferable to use a value. Further, in principle, it is preferable that the control circuit 41 sets the output of the buck converter 40 to the rated value when the signal level is zero. However, since the output voltage of the PFC circuit 44 does not reach the rated voltage immediately after the AC power supply AC is turned on, the output voltage of the buck converter 40 is not stable. Therefore, it is preferable that the control circuit 41 does not receive a control signal and stop the back converter 40 until the preparation period elapses from when the AC power supply AC is turned on. That is, since power supply from the lighting unit 4 is not performed during the preparation period, the light source unit 1 is maintained in the extinguished state. When the output voltage of the PFC circuit 44 stabilizes after the preparation period, the control circuit 41 operates the buck converter 40 to supply the light source unit 1 with the DC power of the output level corresponding to the control signal. As a result, the light source unit 1 lights up at the dimming level instructed by the control signal.

  Next, the structure of the lighting device 8 and the lighting fixture according to the present embodiment will be described in detail with reference to FIGS. 4 to 6. In the present embodiment, a light projector is exemplified as the lighting device, but the lighting device to which the technical idea of the present invention can be applied is not limited to the light projector, and may be, for example, a high ceiling light fixture or a road light.

  The lighting apparatus includes a plurality of (four in the illustrated example) light source units 1 and a lighting device 8 as shown in FIGS. 5 and 6. Furthermore, the lighting fixture preferably includes a connecting member that connects the plurality of light source units 1 and an arm 16. However, the number of light source units 1 constituting the lighting fixture is not limited to four, and may be one to three, or five or more. In the following description, unless otherwise noted, the upper, lower, left, and right directions in FIG. 5 are defined, and the front side of the sheet is the front.

  The light source unit 1 has an LED module and a heat dissipation member 3 as shown in FIG. The LED module preferably includes a plurality of light emitting diodes (LEDs) and a mounting substrate. The LEDs are, for example, package-type white LEDs that are conventionally known. The mounting substrate is preferably configured of a rectangular flat aluminum substrate. The LEDs are mounted vertically and horizontally on the front surface of the mounting substrate. Also, the receptacle connector is mounted on the front surface of the mounting substrate. The receptacle connector is electrically connected to the electrode (cathode and anode) of each LED through a wiring conductor formed on the front surface of the mounting substrate.

  As shown in FIG. 6, the heat dissipation member 3 is preferably configured by a base portion 30, a pair of edge portions 31, and a plurality of heat dissipation plates 32. In addition, it is preferable that the base part 30, the edge part 31, and the heat sink 32 are formed with the material excellent in thermal conductivity, such as aluminum alloy, for example. The base portion 30 is formed in a rectangular flat plate shape. The LED module is fixed to the front of the base 30. In addition, a cover 7 is attached to the front of the base 30 so as to cover the LED module (see FIG. 5). The cover 7 is formed in a flat rectangular box shape by a translucent synthetic resin material such as polycarbonate resin. The pair of edge portions 31 is a rectangular parallelepiped whose longitudinal direction is the vertical direction, and is integrally formed with the base portion 30 at the left end edge and the right end edge of the base portion 30. The thickness (the width in the front-rear direction) of the edge portion 31 is formed sufficiently larger than the thickness of the base portion 30.

  The connection member preferably includes a first connection member 10, a second connection member 11, a third connection member 12, and an auxiliary connection member, as shown in FIG.

  The first connection member 10 has a strip-shaped main piece 100 and an auxiliary piece 101 that protrudes in the thickness direction of the main piece 100 along the longitudinal direction of the main piece 100. The main piece 100 and the auxiliary piece 101 are integrally formed by bending a metal plate such as a stainless steel plate along the longitudinal direction.

  Further, the first connecting member 10 is provided with protruding pieces 102 and 103 at both ends and the center in the longitudinal direction of the main piece 100, respectively. However, the central projecting piece 103 has a length twice as large as that of the projecting pieces 102 at both ends. Further, the tip of the central protrusion 103 is bent outward. Each protrusion 102, 103 is provided with one or two screw insertion holes, respectively (see FIGS. 5 and 6).

  As shown in FIG. 6, the first connection member 10 is attached to the two light source units 1 by screwing the protruding pieces 102 and 103 to the edge 31 of the heat dissipation member 3. That is, the screw 104 inserted into the screw insertion hole of each of the protrusions 102 and 103 is screwed into the screw hole of the edge portion 31.

  The second connection member 11 is formed of a strip-like metal plate (for example, a stainless steel plate or the like). However, the central portion 110 of the second connection member 11 protrudes in the thickness direction with respect to the end portions 111 on both sides. The central portion 110 is provided with three screw insertion holes. On the other hand, two screw insertion holes are provided at each end 111 (see FIG. 6).

  The second connection member 11 is attached to the two light source units 1 by being screwed to the edge portion 31 of the heat dissipation member 3. That is, the screw 112 inserted into the screw insertion hole of the central portion 110 and each end portion 111 is screwed into the screw hole of the edge portion 31.

  The third connecting member 12 is formed of a strip-like metal plate (for example, a stainless steel plate or the like). However, the third connecting member 12 is reinforced by bending both ends along the longitudinal direction in the thickness direction. Further, the third connecting member 12 is provided with two screw insertion holes at both ends in the longitudinal direction. These screw insertion holes are provided to be aligned in the lateral direction of the third connecting member 12. The third connection member 12 is attached to the four light source units 1 by being screwed to the edge portion 31 of the heat dissipation member 3 (see FIG. 5).

  As shown in FIGS. 5 and 6, the auxiliary connection member is constituted by a pair of arm attachment members 13 and a pair of reinforcing fittings 14. The arm attachment member 13 has an angular hook-shaped fixed portion 130, a pair of attachment portions 131, and a bearing portion 132. Preferably, the fixing portion 130, the mounting portion 131, and the bearing portion 132 are integrally formed by, for example, aluminum die casting.

  The pair of attachment portions 131 are formed in a long truncated cone shape and project rearward from the fixing portion 130. A female screw is formed at the tip of each mounting portion 131.

  The bearing portion 132 is formed in a cylindrical shape, disposed between the pair of attachment portions 131 and connected to the attachment portions 131 and the fixing portion 130. At the center of the bearing portion 132, a screw hole is provided.

  The reinforcing metal fitting 14 is, as shown in FIG. 6, made of a strip-like metal plate (for example, a stainless steel plate or the like). However, the reinforcement fitting 14 is reinforced by bending both ends along the longitudinal direction in the thickness direction. The pair of reinforcing brackets 14 are attached to the attachment portions 131 of the arm attachment members 13 on the left and right sides so as to be aligned in the vertical direction. That is, the bolt 140 is inserted into the screw insertion holes provided at both ends of the reinforcing fitting 14, and the bolt 140 is screwed into the female screw at the tip of the mounting portion 131 and screwed (see FIG. 6).

  As shown in FIG. 6, the arm 16 includes a fixing plate 160, a pair of rising pieces 161 rising obliquely upward from the left and right ends of the fixing plate 160, and a support piece 162 rising obliquely upward from the tip of each rising piece 161. And are integrally formed of a metal plate.

  In the fixing plate 160, a circular fixing hole 1601 penetrates substantially at the center, and a semicircular long hole 1600 centered on the fixing hole 1601 penetrates behind the fixing hole 1601 (see FIG. 6). Then, the fixing plate 160 is fixed to a lighting platform (a base made of concrete) or the like by a bolt inserted into the fixing hole 1601 and a bolt inserted into the long hole 1600. Further, by loosening the bolt inserted into the long hole 1600, the direction of the arm 16 (the direction of the light source unit 1) can be changed within a range of about 180 degrees.

  Each support piece 162 has a circular insertion hole penetrating at its tip. Therefore, the four light source units 1 connected by the connecting member can be rotatably supported by the arm 16 by screwing the bolt 163 inserted into the insertion hole into the screw hole of the bearing portion 132 of the arm mounting member 13. it can.

  By the way, the wiring box 15 is attached to the lower reinforcement fitting 14 by screwing (see FIG. 6).

  The wiring box 15 is formed in a rectangular box shape by a metal material. A terminal block for relay is accommodated in the wiring box 15. The terminal block is configured to electrically connect a power supply cable for supplying AC power from the power system and the power supply cable 9 for supplying the AC power to the lighting device 8.

  The lighting device 8 is configured to accommodate the two lighting units 4 in the case 81, as shown in FIGS. 1A and 1B. However, in the following description regarding the lighting device 8, in FIG.

  In the lighting unit 4, as shown in FIG. 1B, FIG. 2 and FIG. 4, plural types of circuit components 801 (including 801A, 801B, 801C) constituting the lighting circuit are mounted on the surface of the printed wiring board 800. Configured Moreover, it is preferable that the lighting unit 4 has an output cable provided with a plug connector at its tip. The output cable is preferably drawn out of the case 81 and electrically connected to the receptacle connector of the light source unit 1 directly or through another wire cable. However, in the lighting circuit (lighting unit 4), it is preferable that the circuit component (for example, a semiconductor switching element for switching power supply etc.) 801B constituting the first control power supply circuit 42 be mounted on the back surface of the printed wiring board 800 (See FIG. 1B).

  Furthermore, the lighting unit 4 has two coupling members 802 which rise from the end on one side of the printed wiring board 800 (see FIG. 4). In the following description, of the two ends along the longitudinal direction (longitudinal direction) of printed wiring board 800, the end on which coupling member 802 is provided is referred to as the first end, and the other end The part is called the second end.

  The two coupling members 802 each have a main body 8020 and a pair of fixing portions 8021. The main body 8020 is formed in a rectangular flat plate shape by a metal material (for example, aluminum or an aluminum alloy). The pair of fixing portions 8021 are formed in an L shape and configured to protrude from the front end and the rear end at one end edge along the longitudinal direction of the main body 8020 (see FIGS. 1B, 2 and 4). ). The coupling member 802 has the main body 8020 erected along the normal direction (vertical direction) of the component surface by fixing the pair of fixing portions 8021 to the component surface at the first end of the printed wiring board 800. Provided so as to make it possible (see FIG. 4). Further, the coupling member 802 is provided such that a plurality of screw holes 8022 and 8023 penetrating in the thickness direction are aligned in the longitudinal direction (see FIG. 2). Further, among the circuit components 801 mounted on the component surface of the first end of the printed wiring board 800, the coupling member 802 is a semiconductor component used for the full-wave rectifier 46, the switching elements Q11, Q12, Q21, Q22, etc. For example, it is thermally coupled to a power MOSFET or the like 801A. In addition, these semiconductor components 801A usually have a radiator (heat sink). Then, the semiconductor component 801A and the main body 8020 are thermally coupled by screwing the screw 803 inserted through the screw insertion hole provided in the radiator into the screw hole 8023 provided in the main body 8020 (see FIG. 1B, see FIGS. 2 and 4).

  The case 81 preferably includes a case body 82 and two lids 83 and 84 (see FIG. 6). The case main body 82 is preferably formed in a rectangular tube shape in which both ends in the axial direction are opened by, for example, extrusion molding of aluminum or an aluminum alloy. Also, in the case body 82, grooves 85 are formed in the upper and lower inner side surfaces of the left side wall 820, respectively. Further, in the case body 82, grooves 85 are formed in the upper and lower inner side surfaces of the right side wall 821 (see FIGS. 1B and 2). The grooves 85 are preferably configured to be straight and parallel to each other from one open end (insertion port) of the case main body 82 to the other open end. The width of the groove 85 may be a size slightly larger than the thickness of the printed wiring board 800.

  Further, four cable insertion holes pass through the rear end portion of the lower side wall 823 of the case main body 82. An output cable is penetrated by these four cable penetration holes, respectively, and an output cable is fixed to side wall 823 by a clasp.

  The lids 83 and 84 are preferably formed in a flat plate shape by aluminum die casting, for example. It is preferable that these two lids 83 and 84 be configured to close the openings at both ends of the case body 82 by being screwed to the axial ends of the case body 82, respectively (see FIG. 6). ). However, it is preferable that waterproof packing be sandwiched between the lids 83 and 84 and the end of the case body 82 to prevent the entry of rainwater into the case body 82. Further, the cable insertion hole penetrates to the center of the lid portion 84 on one side (front side). Then, the power supply cable 9 is inserted into the cable insertion hole, and the power supply cable 9 is fixed to the lid 84 by the fasteners.

  In the lighting device 8, as shown in FIG. 6, the side wall 823 of the case main body 82 is preferably screwed to the pair of reinforcing fittings 14. At this time, it is preferable that the lighting device 8 be fixed to the reinforcing fitting 14 in a posture in which the cover 84 to which the power supply cable 9 is fixed is down and the other cover 83 is up.

  Next, an assembly operation of the lighting device 8 of the present embodiment will be described. First, the operator inserts the output cables into the four cable insertion holes in the side wall 823, and electrically connects the two output cables to the output terminals of the two lighting units 4, respectively.

  Subsequently, the operator inserts the both ends of the printed wiring board 800 of one lighting unit 4 into the lower groove 85 of the side walls 820 and 821 from the opening (insertion opening) on one side of the case body 82. (See Figure 2). Similarly, the operator inserts both ends of the printed wiring board 800 of the other lighting unit 4 from the insertion opening of the case main body 82 into the upper groove portion 85 of the left and right side walls 820 and 821. At this time, the coupling member 802 of the lower lighting unit 4 is close to the side wall 821 on the right side, and the coupling member 802 of the other lighting unit 4 is close to the side wall 820 on the left side. Each lighting unit 4 is supported by the case main body 82 by inserting the both ends (first end and second end) along the longitudinal direction of the printed wiring board 800 into the groove 85.

  From the outside of the case main body 82, the operator inserts the screws 88 into the plurality of through holes provided in the left and right side walls 820 and 821 and screws the screws 88 into the screw holes 8023 of the coupling member 802. That is, in the lighting device 8 of the present embodiment, the coupling member 802 of each lighting unit 4 is screwed to the side walls 820 and 821 of the case main body 82 to be mechanically and thermally coupled (see FIGS. 1B and 2) .

  Subsequently, the operator electrically connects the power supply cable 9 inserted through the cable insertion hole of the lid 84 to the input terminal of each lighting unit 4. Then, the operator screws the two lids 83 and 84 to the front end and the rear end of the case body 82. Finally, the operator screws the fasteners to the side wall 823 to fix the output cable to the case body 82, and screws the fasteners to the lid 84 to fix the power cable 9 to the case body 82. Thus, the assembly work of the lighting device 8 is completed.

  As described above, the lighting device 8 of the present embodiment supports the lighting unit 4 by the case main body 82 by inserting the end of the printed wiring board 800 into the groove 85 provided in the case main body 82. Furthermore, the lighting device 8 of the present embodiment thermally couples a specific circuit component (semiconductor component 801A) of the lighting unit 4 to the case main body 82 via the coupling member 802. Therefore, the heat generated in the semiconductor component 801A is transmitted to the case main body 82 through the coupling member 802, and is dissipated through the case main body 82. Therefore, the lighting device 8 of the present embodiment can improve the heat dissipation by transferring the heat of the semiconductor component 801A to the case main body 82 through the coupling member 802.

  Further, as in the present embodiment, in the case where the lighting device 8 includes two lighting units 4, two different side walls among the plurality of side walls 820 to 823 of the case main body 82 are the coupling members 802 of the respective lighting units 4. Preferably, it is thermally coupled to 820, 821. That is, in the lighting device 8 of the present embodiment, the heat of the semiconductor component 801A is compared with the case where the coupling members 802 of the two lighting units 4 are thermally coupled to the same side wall (for example, the side wall 820). Heat can be efficiently dissipated from the main body 82.

  The width of the groove 85 of the case body 82 is larger than the thickness (thickness) of the printed wiring board 800. On the other hand, on the printed wiring board 800, components (hereinafter, referred to as heavy components) which are relatively heavy in weight as compared with the semiconductor components 801A, chip resistors, capacitors and the like are mounted. Specifically, the inductor constituting the filter circuit 45, the inductor L1 constituting the PFC circuit 44, the inductors T1 and T2 (transformers) constituting the buck converter 40, etc. correspond to the heavy part 801C. Then, these heavy components 801C are mounted at a position farther from the coupling member 802 than the center in the lateral direction of the printed wiring board 800 (see FIG. 4). Therefore, there is a possibility that the printed wiring board 800 may be bent by the clearance between the printed wiring board 800 and the groove 85 in the thickness direction (vertical direction). Then, in a state where the printed wiring board 800 is bent, stress is generated at the bonding portion (solder) of the terminal of the circuit component 801 and the conductor of the printed wiring board 800, so that stress is applied to the solder.

  Therefore, the lighting device 8 of the present embodiment suppresses the bending of the printed wiring board 800 by fixing the metal reinforcing member 804 to the printed wiring board 800, and reduces the stress applied to the printed wiring board 800 and the solder. ing.

  The reinforcing members 804 are respectively fixed to the third end and the fourth end along the lateral direction (left and right direction) of the printed wiring board 800 (see FIG. 4). Each reinforcing member 804 is preferably formed in a length dimension from the first end to a region where the heavy part 801 C is mounted at the third end and the fourth end of the printed wiring board 800. For example, as shown in FIG. 4, each reinforcing member 804 is preferably formed to have a length that is slightly shorter than the width of the printed wiring board 800 in the lateral direction (left-right direction). Each reinforcing member 804 is preferably formed in a strip shape of a metal material such as aluminum or an aluminum alloy. Then, each reinforcing member 804 is preferably fixed (for example, screw fixed) to the printed wiring board 800 at both end portions in the longitudinal direction.

  Furthermore, each reinforcing member 804 preferably has a connecting portion 8040 connected to the connecting member 802. It is preferable that the connecting portion 8040 be integrally formed so as to protrude in the short direction from one end of the reinforcing member 804 in the longitudinal direction. The connecting portion 8040 is formed in a rectangular flat plate shape. The distal end portion of the connecting portion 8040 is preferably fixed (screw fixed) to the printed wiring board 800 together with the fixing portion 8021 of the coupling member 802.

  By thus connecting each reinforcing member 804 to the connecting member 802 by the connecting portion 8040, the deflection of the printed wiring board 800 can be further suppressed.

  The lighting device 8 of the present embodiment has a lighting unit 4 for lighting the light source (light source unit 1) and a case 81 for housing the lighting unit 4. The lighting unit 4 includes a lighting circuit configured by mounting a plurality of types of circuit components 801 on a rectangular flat printed wiring board 800, and a circuit component having a relatively large amount of heat generation among the plurality of types of circuit components 801 And a coupling member 802 mechanically coupled to the semiconductor component 801A). The lighting unit 4 further includes one or more metal reinforcing members 804 fixed to the printed wiring board 800. The case 81 has a case main body 82 formed in a cylindrical shape with an insertion opening opened at at least one end, and lids 83 and 84 attached to the case main body 82 so as to close the insertion opening. The case body 82 is provided with two grooves 85 in the inner wall surface (side wall 820). In the two grooves 85, the first end and the second end along the longitudinal direction of the printed wiring board 800 can be separately inserted from the insertion port, and the first end and the second end after insertion Configured to support each of In the printed wiring board 800, a circuit component (semiconductor component 801A) having a relatively large amount of heat generation is mounted near the first end. The coupling member 802 is made of a metal plate material, and a main body 8020 to which a circuit component (semiconductor component 801A) relatively generating a relatively large amount of heat is mechanically coupled, and a second surface of the printed wiring board 800 protruding from the main body 8020 And one or more fixing portions 8021 fixed near one end. The main body 8020 is configured to be mechanically coupled to the case main body 82. The reinforcing member 804 is fixed to the third end and the fourth end along the lateral direction of the printed wiring board 800.

  The lighting device 8 of the present embodiment is configured as described above, and since the bending of the printed wiring board 800 is suppressed by fixing the metal reinforcing member 804 to the printed wiring board 800, the printed wiring board 800 and the solder Stress can be reduced.

  Further, since the lighting apparatus of the present embodiment includes the lighting device 8 of the present embodiment and the light source (light source unit 1) lighted by the lighting device 8, stress applied to the printed wiring board 800 and solder of the lighting device 8 Can be reduced.

  Further, the reinforcing member 804 is a circuit component having a relatively large weight among the plurality of types of circuit components 801 from the first end at the third end and the fourth end of the printed wiring board 800 (heavy part 801 C It is preferable to form in the length dimension to the area | region where is mounted.

  If the lighting device 8 of the present embodiment is configured as described above, bending of the printed wiring board 800 can be further suppressed.

  Here, the reinforcing member 804 preferably includes one or more connecting portions connected to the connecting member 802.

  If the lighting device 8 of the present embodiment is configured as described above, bending of the printed wiring board 800 can be further suppressed.

  The number of reinforcing members 804 is not limited to two, and may be one or three or more. Moreover, the reinforcement member 804 is not limited to the shape of this embodiment. For example, two reinforcing members 804 may be connected at the second end side. Furthermore, the light source unit 1 may be configured to use a solid light emitting element other than an LED such as an organic electroluminescent element as a light source.

DESCRIPTION OF SYMBOLS 1 light source unit 4 lighting unit 8 lighting device 81 case 82 case main body 83 lid 84 lid 85 groove 800 printed circuit board 801 circuit component 801A semiconductor component (circuit component generating a relatively large amount of heat)
802 connecting member 804 reinforcing member 8020 main body portion 8021 fixing portion

Claims (2)

A lighting unit for lighting a light source, and a case for housing the lighting unit;
The lighting unit includes a lighting circuit configured by mounting a plurality of types of circuit components on a rectangular flat printed wiring board, and a circuit component and a mechanical component that generate a relatively large amount of heat among the plurality of types of circuit components. And one or more metal reinforcing members fixed to the printed wiring board.
The case includes a cylindrical case main body having an insertion opening opened at at least one end, and a lid attached to the case main body so as to close the insertion opening.
In the case body, two grooves are provided in the inner wall surface, and the two grooves can be separately inserted into the insertion port from the first end and the second end along the longitudinal direction of the printed wiring board And configured to support the first end and the second end after insertion respectively;
In the printed wiring board, a circuit component having a relatively large amount of heat generation is mounted near the first end,
The connecting member is made of a metal plate, and a main body to which a circuit component having a relatively large amount of heat generation is mechanically connected, and a first end of the printed wiring board so as to protrude from the main body. And one or more fixed parts fixed nearby,
The body portion is configured to be mechanically coupled to the case body,
The reinforcing member has a plate shape, and is fixed to at least a third end and a fourth end along a short direction on the printed wiring board .
The reinforcing member further lighting device according to claim Rukoto which having a connecting portion connected to the coupling member.   A lighting fixture comprising the lighting device according to claim 1 and a light source to be lit by the lighting device.

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