WO2018180412A1

WO2018180412A1 - Lighting apparatus

Info

Publication number: WO2018180412A1
Application number: PCT/JP2018/009417
Authority: WO
Inventors: 忠叡楊
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2017-03-31
Filing date: 2018-03-12
Publication date: 2018-10-04
Also published as: JP2018174103A; DE112018001753B4; JP6830196B2; DE112018001753T5

Abstract

The objective of the present invention is to provide a lighting apparatus allowing reliability to be improved with respect to temperature. This lighting apparatus (1) comprises a light source unit (3), a lighting circuit (80), a detection circuit (13), and a control unit (85). The light source unit (3) has an LED module (31) and a case. The lighting circuit (80) causes the LED module (31) to light up. The detection circuit (13) includes a thermally sensitive element (RT) the electrical resistance value of which changes according to the temperature of the light source unit (3), the detected value therefrom changing according to the change in the electrical resistance value of the thermally sensitive element (RT). When a first threshold value corresponding to a first reference temperature is reached by the detected value from the detection circuit (13), the control unit (85) causes the light output of the LED module (31) to be reduced via the lighting circuit (80), and when a second threshold value corresponding to a second reference temperature that is a higher temperature than the first reference temperature is reached, the control unit (85) causes the LED module (31) to be turned off via the lighting circuit (80).

Description

lighting equipment

The present invention generally relates to a lighting fixture, and more particularly to a lighting fixture powered by a battery pack.

Conventionally, a lighting device including a main body, a lighting unit, and a battery pack (battery pack) has been proposed as a lighting fixture (Patent Document 1). The main body is formed in a rod shape that can be gripped by the user. The illumination part is provided on one end side in the longitudinal direction of the main body part. The battery pack is detachably attached to the other end in the longitudinal direction of the main body.

The illumination part is provided so as to be swingable with respect to the main body part and foldable with respect to the main body part via a connecting part formed on one end side in the longitudinal direction of the main body part.

照明 With lighting fixtures, the operating temperature may become higher than the upper limit of the operating temperature range during use depending on the usage conditions.

Japanese Unexamined Patent Publication No. 2016-51598

An object of the present invention is to provide a lighting apparatus capable of improving reliability with respect to temperature.

The lighting apparatus of one aspect according to the present invention includes a light source unit, a lighting circuit, a detection circuit, and a control unit. The light source unit includes an LED module and a case storing the LED module. The lighting circuit is powered by a battery pack and lights the LED module. The detection circuit includes a temperature-sensitive element whose electric resistance value changes according to the temperature of the light source unit, and the detection value changes according to a change in the electric resistance value of the temperature-sensitive element. The control unit reduces the light output of the LED module by the lighting circuit when the detection value by the detection circuit reaches a first threshold value corresponding to the first specified temperature, and a second temperature higher than the first specified temperature. When the second threshold value corresponding to the specified temperature is reached, the LED module is turned off by the lighting circuit.

FIG. 1 is a circuit diagram of a lighting fixture according to an embodiment of the present invention. FIG. 2 is an explanatory view of the operation of the above-described lighting apparatus. FIG. 3 is a perspective view of the above-described lighting fixture as viewed from above. FIG. 4A is a front view of the same lighting fixture. FIG. 4B is a left side view of the same lighting fixture. FIG. 4C is a right side view of the same lighting fixture. FIG. 5 is a perspective view showing a state where the handle is removed from the above-described lighting apparatus. FIG. 6 is an exploded perspective view of the same lighting fixture. FIG. 7 is an exploded perspective view of the light source unit of the same lighting fixture. FIG. 8 is a perspective view seen from the lower side of the same lighting fixture. FIG. 9 is a perspective view of a battery pack attached to the same lighting fixture. FIG. 10 is an explanatory diagram of a first position and a second position of each of the plurality of light source units in the lighting fixture same as above. FIG. 11: is a perspective view which shows an example of the usage condition of a lighting fixture same as the above. FIG. 12 is a cross-sectional view taken along the line X1-X1 of FIG. FIG. 13 is a cross-sectional view taken along the line X2-X2 of FIG. FIG. 14 is a perspective view of a main part of the lighting apparatus same as above.

(Embodiment)
Below, the lighting fixture 1 which concerns on embodiment is demonstrated based on FIGS. 1-14.

The lighting fixture 1 is a portable lighting fixture. In more detail, the luminaire 1 can be used as a lantern, a projector, or the like.

Hereinafter, the structure of the lighting fixture 1 will be described based on FIGS. 3 to 14, and then the circuit configuration of the lighting fixture 1 will be described in more detail.

The lighting fixture 1 includes a base 2, a plurality of (here, two) light source units 3, a coupling device 4, and a circuit unit 8 (see FIGS. 1 and 6). In the lighting fixture 1, a mounting portion 10 to which the battery pack 9 is detachably mounted is provided on the base 2. The battery pack 9 is electrically connected to the circuit unit 8 by being mounted on the mounting portion 10 provided on the base 2. Each of the plurality of light source units 3 includes a light source 30 (see FIGS. 1 and 3). The light source 30 includes two LED modules 31 (LED: Light Emitting Diode). The connecting device 4 connects the plurality of light source units 3 to the base 2. The circuit unit 8 includes a lighting circuit 80 (see FIG. 1) that lights the plurality of light source units 3 and a control unit 85 (see FIG. 1) that controls the lighting circuit 80. The circuit unit 8 is housed in the base 2. The circuit unit 8 is supplied with power from the battery pack 9. The lighting fixture 1 does not include the battery pack 9 described above as a component, but may include the battery pack 9 as a component. The luminaire 1 includes a plurality (here, two) of detection circuits 13 (see FIG. 1) whose detection values change according to temperature changes of the plurality of light source units 3. Each of the plurality of detection circuits 13 includes a temperature sensing element RT whose electric resistance value changes according to the temperature of the light source unit 3, and the detection value changes according to a change in the electric resistance value of the temperature sensing element RT. The plurality of detection circuits 13 are in one-to-one correspondence with the plurality of light source units 3.

The base 2 is formed in a flat rectangular parallelepiped shape, and has a first surface 21 and a second surface 22 (see FIG. 8) in the thickness direction. The base 2 has electrical insulation. The base 2 is hollow and configured to accommodate the circuit unit 8 (see FIG. 6). The battery pack 9 is detachably mounted on a mounting portion 10 (see FIGS. 3 and 8) provided on the base 2.

The battery pack 9 (see FIG. 9) includes a plurality of (for example, five) secondary batteries (for example, lithium ion batteries), a rectangular parallelepiped housing body 91 that houses the plurality of secondary batteries, and a housing body 91. A flat rectangular parallelepiped protruding portion 92 protruding from a part of one surface 911. The housing main body 91 and the protruding base 92 have electrical insulation. In the battery pack 9, five lithium ion batteries are connected in series in the housing body 91. The rated voltage of the battery pack 9 is 18V. The battery pack 9 includes a communication connector 99. The communication connector 99 is a connector for communicating battery information indicating information of the battery pack 9. The battery information includes temperature information, remaining capacity information, rated voltage information, rated capacity information, frequency information, and the like. As the battery pack 9, for example, EZ9L54 (product number), which is a lithium ion battery pack manufactured by Panasonic Corporation, can be used.

The protrusion 92 has a first end 921 and a second end 922 in the longitudinal direction. In the battery pack 9, three

insertion grooves

931, 932, and 933 are formed in the first end 921 of the projecting portion 92.

Female connection terminals

961, 962, and 963 are accommodated in the three

insertion grooves

931, 932, and 933, respectively. In addition, the battery pack 9 includes three L-shaped

hooks

941, 942, 943 provided on each of the pair of side surfaces 923 in the short direction of the protrusion 92. Further, the battery pack 9 includes a lock portion 95 that is exposed from the one surface 911 of the housing main body 91 and disposed between the hook 942 and the hook 943. The lock portion 95 is passed through a hole 915 in the wall including the one surface 911 of the housing main body 91. The lock portion 95 is given a force in a direction in which the lock portion 95 protrudes from one surface 911 of the housing main body 91 by a spring (hereinafter referred to as a return spring) housed in the housing main body 91. Here, the return spring is a compression coil spring. In addition, the battery pack 9 includes a lock release operation unit 97 (see FIGS. 3 and 6) for releasing the locked state by the lock unit 95.

As shown in FIG. 8, the mounting portion 10 has a recess 100 that is formed on the second surface 22 of the base 2 and accommodates the protruding portion 92 of the battery pack 9 (see FIG. 9). In the recess 100, the second surface 22 side of the base 2 and the one side surface 23 side of the base 2 in the longitudinal direction are opened. The mounting portion 10 includes three L-shaped

hooks

131, 132, and 133 that are provided on each of the pair of inner side surfaces 103 in the short direction of the concave portion 100 and are respectively hooked on the

hooks

941, 942, and 943 of the battery pack 9. Further, the mounting portion 10 is plugged into the communication connector 109 that can be connected to the communication connector 99 of the battery pack 9 and the two

connection terminals

961, 962, 963 of the battery pack 9. Two

power terminals

111 and 112 are provided. Here, the connection terminal 961 is a positive power supply terminal of the battery pack 9. The connection terminal 962 is a negative power supply terminal of the battery pack 9.

When the battery pack 9 is attached to the attachment portion 10, for example, the protrusion 92 of the battery pack 9 is set so that the

hooks

941, 942, 943 of the battery pack 9 and the

hooks

131, 132, 133 of the attachment portion 10 do not interfere with each other. The base 2 is inserted into the concave portion 100 of the mounting portion 10 from the second surface 22 side. Thereafter, the battery pack 9 can be mounted on the mounting portion 10 by shifting the battery pack 9 toward the first end 921 of the projecting portion 92. When the battery pack 9 is attached to the attachment portion 10, the

hooks

941, 942, 943 of the battery pack 9 are hooked on the

hooks

131, 132, 133 of the attachment portion 10, respectively. In addition, the lock portion 95 of the battery pack 9 is in a locked state in which the hook 133 of the mounting portion 10 that is hooked on the hook 943 of the battery pack 9 is locked.

When removing the battery pack 9 from the mounting portion 10, for example, by operating a lock release operation portion 97 provided in the battery pack 9, the lock portion 95 disposed between the hook 942 and the hook 943 is returned to the return spring. After the battery pack 9 is moved toward the second end 922 side of the projecting portion 92, the battery pack 9 may be moved away from the inner bottom surface 101 of the concave portion 100 of the mounting portion 10.

The light source unit 3 includes a light source 30 and a case 32 as shown in FIGS. The light source 30 is housed in a case 32. The light source 30 includes two LED modules 31. Each of the two LED modules 31 includes an LED 311 and a circuit board 312 on which the LED 311 is mounted. Each of the two LED modules 31 includes a connector 34 (see FIG. 3). The connector 34 is connected to a power supply lead 391 (see FIG. 7) and the like for connecting the light source unit 3 and the circuit unit 8 (see FIGS. 1 and 6).

The LED 311 is, for example, a surface mount type LED. The light source color of the LED 311 is preferably set based on, for example, the correlated color temperature of the LED light source color defined in JIS Z9112: 2012. The light source color of the LED 311 is daytime white, but is not limited thereto, and may be, for example, a light bulb color.

The circuit board 312 is constituted by a printed wiring board as an example. The printed wiring board preferably has a high thermal conductivity. As an example, the printed wiring board is a metal-based printed wiring board. The printed wiring board constituting the circuit board 312 is not limited to a metal-based printed wiring board, but is, for example, a glass cloth / glass nonwoven fabric composite base material epoxy resin copper-clad laminate that meets CEM-3 (Composite Epoxy Materials 3) standards. It may be formed from.

The LED module 31 preferably includes a plurality of (for example, five) LEDs 311. In the LED module 31, the circuit board 312 is formed in a long flat plate shape. In the LED module 31, five LEDs 311 are arranged in a line along the longitudinal direction of the circuit board 312 on the circuit board 312. In the LED module 31, five LEDs 311 on the circuit board 312 are connected in series. In the light source 30, the conductor portions of the circuit boards 312 of the two LED modules 31 are connected by lead wires so that the ten LEDs 311 are connected in series. In the LED module 31, five LEDs 311 are arranged at substantially equal intervals. The “substantially equal intervals” here do not have to be exactly the same intervals, but may be intervals within a predetermined range.

In each of the plurality of light source units 3, the two circuit boards 312 are arranged so as to increase the light distribution angle of the light source unit 3 as compared with the case where the two circuit boards 312 are arranged in parallel on one plane. Inclined in different directions with respect to a plane orthogonal to the thickness direction. Thereby, each of the plurality of light source units 3 is arranged in the case 32 so that the optical axes of the LEDs 311 of the two LED modules 31 face different directions. The case 32 has a light emission surface 3222 from which light from the light source 30 is emitted, and a back surface 3212 (see FIG. 6) opposite to the light emission surface 3222.

The LED module 31 includes a reflection plate 37 (see FIGS. 7 and 14) that reflects light from the light source 30 toward the light emitting surface 3222 in the case 32. The material of the reflecting plate 37 is, for example, a metal (for example, aluminum). The reflection plate 37 also has a function as a heat dissipation plate for dissipating heat generated in the LED module 31.

The case 32 is formed in a panel shape. The outer shape of the case 32 viewed from the thickness direction of the case 32 is a rectangular shape. The case 32 includes a body 321 that holds the light source 30 and a cover 322 that is coupled to the body 321 so as to cover the light source 30. In the case 32, at least a part of the surface of the cover 322 constitutes the light emission surface 3222. The body 321 is made of, for example, ABS resin. The cover 322 is made of, for example, polycarbonate. In the light source unit 3, the light emitted from the light source 30 is emitted from the light exit surface 3222.

The light source unit 3 further includes a protrusion 33 (see FIG. 6) protruding from the back surface 3212 (see FIG. 6) of the case 32. Thereby, the luminaire 1 can increase the heat dissipation area compared to the case where the protrusion 33 is not provided on the back surface 3212 side of the case 32, and the heat dissipation can be improved. The light source unit 3 preferably includes a plurality of protrusions 33. Thereby, the lighting fixture 1 can further improve heat dissipation. In the light source unit 3, each of the plurality of protrusions 33 is formed along the longitudinal direction of the case 32.

The light source unit 3 preferably further includes a heat conductive sheet 36 interposed between the LED module 31 and the reflection plate 37 as shown in FIGS. The thermally conductive sheet 36 has electrical insulation and thermal conductivity. The thermally conductive sheet 36 is, for example, a silicone gel sheet having electrical insulation and thermal conductivity. As this type of silicone gel sheet, for example, Sarcon (registered trademark) can be employed. The material of the heat conductive sheet is not limited to silicone gel, and may be, for example, an elastomer or the like as long as it has electrical insulation and heat conductivity.

Since the light source unit 3 includes the heat conductive sheet 36 interposed between the LED module 31 and the reflection plate 37, the heat generated in the LED module 31 can be efficiently transferred to the reflection plate 37. . Therefore, the light source unit 3 can efficiently dissipate the heat generated in the LED module 31 via the reflector 37. The body 321 of the light source unit 3 holds the light source 30 via the reflection plate 37 and the heat conductive sheet 36.

The lighting fixture 1 includes a connecting device 4 that connects a plurality (two) of the light source units 3 and the base 2 as described above (see FIG. 3 and the like). The coupling device 4 enables each of the plurality of light source units 3 to rotate around the first axis 50 (see FIGS. 6 and 12) and around the second axis 60 (see FIG. 6) intersecting the first axis 50. It is configured as follows. Here, the coupling device 4 is configured to be able to rotate each of the plurality of light source units 3 around different second axes 60. The coupling device 4 includes a shaft body 7 (see FIGS. 5, 6, 12 and 13), a holder 20, a plurality (two) of hinge devices 5, and a plurality (two) of rotating mechanisms 6 (see FIG. 6). And comprising.

In the lighting fixture 1, as shown in FIGS. 6 and 12, the first shaft 50 is defined by the shaft body 7. In other words, in the luminaire 1, the axis of the shaft body 7 constitutes the first shaft 50. The shaft body 7 includes a shaft 71. The shaft body 7 is held by the holder 20. The holder 20 has a hollow cylindrical shape. The holder 20 protrudes from the first surface 21 of the base 2. Here, the holder 20 is formed integrally with the base 2. The holder 20 is arranged such that the direction along the short direction of the base 2 is the axial direction of the holder 20. The holder 20 has a shaft portion 201 having an outer diameter smaller than the portion between both ends of the holder 20 at each of both ends in the axial direction of the holder 20. The shaft body 7 is passed through the holes 204 of the pair of shaft portions 201 of the holder 20.

The hinge device 5 can rotate the light source unit 3 around the first axis 50 between a first position (hereinafter also referred to as “reference position”) and a second position (hereinafter also referred to as “deployment position”). The light source unit 3 is connected to the base 2 so as to be. The reference position is a position where the tips of the plurality of light source units 3 are closest to each other. The unfolded position is a position rotated by a maximum rotation angle from the reference position in each of the plurality of light source units 3.

The hinge device 5 includes a bearing portion 51, a ring portion 52, a connecting portion 53, a hinge portion 54, and an arm 55.

The bearing portion 51 is formed in a cylindrical shape. The bearing portion 51 is rotatably supported by the shaft body 7.

The ring portion 52 surrounds the bearing portion 51 and is disposed concentrically with the bearing portion 51. The inner diameter of the ring part 52 is larger than the outer diameter of the bearing part 51. The ring part 52 is separated from the bearing part 51 in the radial direction of the ring part 52.

The connecting portion 53 is disposed between the bearing portion 51 and the ring portion 52 and connects the bearing portion 51 and the ring portion 52.

The hinge portion 54 is rotatably held by the shaft portion 201 located far from the bearing portion 51 of the two shaft portions 201 of the holder 20. The shaft portion 201 is disposed concentrically with the ring portion 52.

The arm 55 connects the ring portion 52 and the hinge portion 54. The arm 55 protrudes outward in the radial direction of each of the ring portion 52 and the hinge portion 54. The arm 55 rotates together with the ring part 52 and the hinge part 54. In the luminaire 1, the light source unit 3 is coupled to the arm 55.

Further, as shown in FIGS. 6 and 13, the hinge device 5 preferably further includes a click plate 56, a click member 57, and a return spring 58.

The click plate 56 has a circular arc shape, is disposed so as to overlap the connecting portion 53, and is fixed to the connecting portion 53. The click plate 56 has a plurality of hemispherical concave portions 561 formed on the surface of the holder 20 facing the shaft portion 201. The sizes of the plurality of recesses 561 are the same. The plurality of recesses 561 are arranged at substantially equal intervals in the circumferential direction of the click plate 56. The plurality of recesses 561 are arranged so that the arm 55 can rotate around the first axis 50 within a first specified angle range (for example, 90 degrees).

As shown in FIG. 13, the click member 57 includes a columnar base 571 and a click protrusion 572. The pedestal 571 is disposed in the holder 20. The click protrusion 572 protrudes from the shaft portion 201 through the circular hole 203 of the tip wall 202 in the shaft portion 201. The pedestal 571 integrally has a flange 573 having an outer diameter larger than the inner diameter of the hole 203. The pedestal 571 is disposed in the holder 20 so that its axial direction is parallel to the first shaft 50. The click protrusion 572 is hemispherical. The click protrusion 572 can enter and leave each of the plurality of recesses 561 of the click plate 56. The return spring 58 is a coil spring. The return spring 58 applies a force in a direction in which the click projection 572 protrudes from the shaft portion 201 to the flange portion 573 of the click member 57. Thereby, the click projection 572 can move between a position protruding from the shaft portion 201 and a position not protruding. In the luminaire 1, when the user rotates the light source unit 3 around the first axis 50, the position of the light source unit 3 is easily maintained at a desired rotational position. Moreover, in the lighting fixture 1, when a user rotates the light source unit 3, a user can obtain a click feeling.

As described above, the luminaire 1 includes the plurality of hinge devices 5 (see FIGS. 3, 6, and 12), and the rotation directions when the plurality of light source units 3 rotate from the reference position to the deployed position are different. It is configured. More specifically, in the lighting fixture 1, the click plates 56 are arranged so as not to overlap each other in the direction of the first shaft 50 (see FIGS. 6 and 12) by the two hinge devices 5. Hereinafter, for convenience of explanation, one of the two light source units 3 may be referred to as a light source unit 3A, and the other light source unit 3 may be referred to as a light source unit 3B. In the example of FIG. 10, the light source unit 3A is at the reference position of the light source unit 3A, and the light source unit 3B is at the reference position of the light source unit 3B. In FIG. 10, the light source unit 3A rotated to the deployed position of the light source unit 3A is indicated by a two-dot chain line, and the light source unit 3B rotated to the deployed position of the light source unit 3B is indicated by a two-dot chain line. The rotation angle of the light source unit 3 around the first axis 50 by the hinge device 5 from the reference position to the deployed position is approximately 90 degrees.

The rotation mechanism 6 (see FIGS. 6 and 13) can rotate the light source unit 3 around a second axis 60 (see FIG. 6) that intersects the first axis 50 (see FIG. 6). Is connected to the hinge device 5.

The rotation mechanism 6 has a shaft portion 61 and a bearing portion 62 as shown in FIGS. The shaft portion 61 is connected to the light source unit 3 at one end in the longitudinal direction of the light source unit 3. The shaft portion 61 protrudes from the facing surface 35 that faces the arm 55 of the hinge device 5 in the light source unit 3. The shaft portion 61 is cylindrical. The bearing portion 62 is provided on the arm 55 and holds the shaft portion 61 rotatably. In the lighting fixture 1, the second shaft 60 is defined by the bearing portion 62.

In the luminaire 1, a pair of power supply lead wires 391 (see FIG. 7), a pair of wiring lead wires 392 (see FIG. 7), a ground lead wire 393 (see FIG. 7), and the like pass through the shaft portion 61. Has been. The pair of power supply lead wires 391 are a pair of lead wires for electrically connecting the light source unit 3 and the lighting circuit 80 (see FIG. 1). The pair of wiring lead wires 392 are a pair of lead wires for electrically connecting the detection circuit 13 (see FIG. 1) and the control unit 85 (see FIG. 1). The ground lead wire 393 electrically connects the reflector 37 of the light source unit 3 (see FIGS. 7 and 14) and the power supply terminal 112 (the connection terminal 962 which is the negative power supply terminal of the battery pack 9 connected to the power supply terminal 112). Lead wire for connection. The ground lead wire 393 and the reflection plate 37 are electrically connected by fixing a lug terminal provided at one end of the ground lead wire 393 to the reflection plate 37 with a screw 38. The circuit unit 8 (see FIG. 6) includes a printed wiring board 82 and two connectors 84 mounted on the printed wiring board 82. A pair of power supply lead wires 391 and a pair of wiring lead wires 392 are connected to the connector 84. The other end of the ground lead wire 393 is electrically connected to the power supply terminal 112 of the pair of

power supply terminals

111 and 112 of the mounting portion 10 on the printed wiring board 82. In the lighting fixture 1, the connection terminal 962, which is the negative power supply terminal of the battery pack 9, is electrically connected to the power supply terminal 112 in a state where the battery pack 9 is mounted on the mounting portion 10.

In the rotation mechanism 6, the shaft portion 61 is coupled to the arm 55 so as to be rotatable around the second shaft 60 in a specified angle range smaller than 360 degrees (for example, 330 degrees). The rotation angle of the light source unit 3 around the second axis 60 by the rotation mechanism 6 is approximately 330 degrees.

The plurality of rotating mechanisms 6 are in a reference state in which the plurality of light source units 3 are gathered when the plurality of light source units 3 are at the reference positions, and the light emission surfaces 3222 of the plurality of light source units 3 face outward. Thus, the rotation range around the second axis 60 of each of the plurality of light source units 3 is defined. The plurality of light source units 3 are individually rotatable around the first axis 50 and the second axis 60. However, when each of the plurality of light source units 3 is at the reference position, each of the plurality of light source units 3 can only rotate around the first axis 50 and is prohibited from rotating around the second axis 60. . If at least one light source unit 3 among the plurality of light source units 3 is in a position rotated around the first axis 50 from the reference position, each of the plurality of light source units 3 can rotate around the second axis 60. Become.

In the lighting fixture 1, the light emitting surfaces 3222 of the two light source units 3 can be opposed to each other by the connecting device 4.

The lighting fixture 1 further includes a handle 14 connected to the connecting device 4. The handle 14 is a component that is held by the user's hand of the luminaire 1 in the luminaire 1. The handle 14 has electrical insulation. The handle 14 is made of a synthetic resin (for example, polypropylene).

The handle 14 is formed in a U shape with the base 2 side opened. More specifically, the handle 14 has a pair of side pieces 141, a center piece 142 that connects the base ends of the pair of side pieces 141, and a disk-like shape provided at the tip of each of the pair of side pieces 141. A pair of rotating bodies 143. In the lighting fixture 1, the pair of rotating bodies 143 are coupled to the coupling device 4 so that the handle 14 can rotate around the first shaft 50.

As shown in FIGS. 6 and 12, each of the pair of rotating bodies 143 includes a shaft portion 1432 that is rotatably held by the ring portion 52 of the hinge device 5, a click member 144, and a return spring 145. . A circular hole 1435 through which the shaft body 7 is passed is formed in the tip wall 1433 of the shaft portion 1432. In the lighting fixture 1, the coupling device 4 further includes a pair of click plates 49 fixed to the shaft body 7.

Each of the pair of click plates 49 has a disc shape, and is disposed so as to overlap the connecting portion 53 of the hinge device 5. Each of the pair of click plates 49 is formed with a non-circular hole 490 through which the shaft body 7 is passed. Each of the pair of click plates 49 has a plurality of hemispherical concave portions 491 formed on the surface facing the shaft portion 1432 of the rotating body 143. The size of the plurality of recesses 491 is the same. The plurality of recesses 491 are arranged at substantially equal intervals in the circumferential direction of the click plate 49. The plurality of recesses 491 are arranged so that the rotating body 143 can rotate around the first shaft 50 in a third specified angle range (for example, 360 degrees).

The click member 144 (see FIG. 12) includes a columnar base 1441 and a click protrusion 1442. The pedestal 1441 is disposed in the rotating body 143. The click protrusion 1442 protrudes from the shaft portion 1432 through the circular hole 1434 of the tip wall 1433 in the shaft portion 1432. The pedestal 1441 integrally has a flange portion 1443 having an outer diameter larger than the inner diameter of the hole 1434. The pedestal 1441 is disposed in the rotating body 143 so that the axial direction thereof is parallel to the first shaft 50. The click protrusion 1442 is hemispherical. The click projection 1442 can enter and leave each of the plurality of recesses 491 of the click plate 49. The return spring 145 is a coil spring. The return spring 145 applies a force in a direction in which the click projection 1442 protrudes from the shaft portion 1432 to the flange portion 1443 of the click member 144. Accordingly, the click protrusion 1442 can move between a position protruding from the shaft portion 1432 and a position not protruding. Therefore, in the lighting fixture 1, when the user rotates the handle 14 around the first axis 50, the position of the handle 14 can be easily maintained at a desired rotation position. Moreover, in the lighting fixture 1, when a user rotates the handle | steering-wheel 14, a user can obtain a click feeling.

The luminaire 1 further includes an L-shaped grip 15 (see FIGS. 3, 4A, 4B, 4C, 5, 6 and 8) formed integrally with the handle 14. The grip 15 is a component that is held by the user's hand of the lighting fixture 1 in the lighting fixture 1. The grip 15 is provided so as to protrude from the center piece 142 of the handle 14 to the side opposite to the pair of side pieces 141.

The lighting apparatus 1 further includes an L-shaped hook 18. As shown in FIG. 4B, an L-shaped slit 155 is formed on one side 151 of the grip 15 so that the L-shaped hook 18 can be inserted and removed. Here, the hook 18 is rotatably connected to the grip 15 by a screw 17 (see FIG. 3). The lighting fixture 1 is provided with the hooks 18, so that the degree of freedom of the installation location is increased, and more various light distributions can be realized. Moreover, the lighting fixture 1 can prevent the lighting fixture 1 from falling by using the hook 18. The luminaire 1 can be used by being hooked on a door, a partition, or the like in a building under construction (dwelling unit, building, facility, etc.) by providing the hook 18.

In the luminaire 1, the circuit unit 8 (see FIG. 6) described above is configured to be powered by the battery pack 9 attached to the attachment unit 10 and to turn on the light sources 30 of the plurality of light source units 3. Has been. More specifically, the circuit unit 8 includes a lighting circuit 80 (see FIG. 1) that is powered from the battery pack 9 and lights the LED module 31. The circuit unit 8 includes a power supply circuit 81 (see FIG. 1) that converts the DC voltage supplied from the battery pack 9 into a predetermined power supply voltage by DC-DC conversion and supplies the converted voltage to the lighting circuit 80. The power supply circuit 81 is, for example, a boost chopper circuit. The lighting circuit 80 is a constant current circuit including, for example, a switching element, a resistor, a control IC (Integrated Circuit), and the like as components. Therefore, the lighting circuit 80 can supply a constant current to the LED module 31. The constant current circuit is, for example, a step-down chopper circuit. The switching element is, for example, an enhancement type n-channel MOSFET. The control IC controls on / off of the switching element. The control IC is configured to adjust the current value of the constant current supplied from the constant current circuit to the LED module 31 by controlling on / off of the switching element. The current value when the LED module 31 is lit at rated power is, for example, 280 mA. In addition, the current value when the dimming lighting is performed so that the light output of the LED module 31 is 10% of the light output when the LED module 31 is rated-lit is, for example, 28 mA.

In addition, the circuit unit 8 (see FIG. 1) is a control power supply circuit that converts the DC voltage supplied from the battery pack 9 into a predetermined control voltage (for example, 5V) and DC-DC converts it to the detection circuit 13 and the control unit 85. 83. The control power supply circuit 83 includes, for example, a three-terminal regulator and a capacitor. The control unit 85 includes a microcomputer. The microcomputer is configured as a one-chip device including a processor that operates according to a program, a memory that stores a program that operates the processor, and a working memory. The control unit 85 can be realized by causing a microcomputer to execute a program. The ground terminal of the microcomputer is grounded. A pair of

power supply terminals

111 and 112 and a communication connector 109 are also mounted on the printed wiring board 82 of the circuit unit 8.

In the circuit unit 8, components of the power supply circuit 81, components of the control power supply circuit 83, components of the lighting circuit 80, components of the control unit 85, and the like are mounted on the printed wiring board 82 (see FIG. 6). ing. The pair of

power supply terminals

111 and 112 and the communication connector 109 of the mounting unit 10 are mounted on the printed wiring board 82 of the circuit unit 8.

The luminaire 1 includes an operation switch 12 (see FIGS. 3, 5 and 6) for instructing full lighting (rated lighting), dimming lighting and extinguishing of the light source unit 3. The operation switch 12 is a push button switch. The operation switch 12 is mounted on the printed wiring board 82 (see FIG. 6) and is electrically connected to the control unit 85 (see FIG. 1). The base 2 has a hole 211 (see FIG. 6) for exposing the push button 121 of the operation switch 12 to the first surface 21 side of the base 2.

In the lighting fixture 1, when the operation switch 12 is operated, the control unit 85 (see FIG. 1) of the circuit unit 8 acquires an operation signal. Here, “the control unit 85 acquires the operation signal” may be that the control unit 85 detects that the operation switch 12 is operated. The control unit 85 acquires an operation signal every time the operation switch 12 is operated. The control unit 85 is configured to change the plurality of light source units 3 in the order of the full lighting state, the first dimming lighting state, the second dimming lighting state, and the extinguishing state each time an operation signal is acquired. Thereby, the lighting fixture 1 can implement | achieve various lighting scenes. The light output in the first dimming lighting state of the light source unit 3 is, for example, 50% of the light output in the fully lighting state, and the light output in the second dimming lighting state is, for example, all lighting. The light output in the state is 10%, and the light output in the off state is 0% of the light output in the fully lighted state. The control unit 85 includes an output unit 853 that outputs a dimming signal for instructing the lighting circuit 80 the magnitude of the light output of the light source unit 3.

The lighting circuit 80 is configured to change the current value of the current supplied to the LED module 31 of the light source unit 3 in accordance with the dimming signal output from the output unit 853 of the control unit 85. In short, the lighting circuit 80 is configured to change the current value of the current flowing through the series circuit of the ten LEDs 311 in the light source unit 3 in accordance with the dimming signal output from the output unit 853 of the control unit 85. . The dimming signal output from the output unit 853 is, for example, a PWM signal that indicates the dimming level with a duty ratio. The PWM signal is, for example, a rectangular wave signal with an amplitude of 5V. The circuit unit 8 has an averaging circuit 88 (see FIG. 1) that averages the PWM signals. The averaging circuit 88 is an integrating circuit having a series circuit of two resistors R1 and R2 and a capacitor C1 connected in parallel to the resistor R2. The voltage value of the output voltage of the averaging circuit 88 increases as the duty ratio of the PWM signal increases. The lighting circuit 80 changes the current value of the current supplied to the LED module 31 of the light source unit 3 based on the voltage value of the output voltage of the averaging circuit 88 (the voltage across the capacitor C1). Specifically, in the lighting circuit 80, the control IC described above has a smaller current value of the current supplied from the lighting circuit 80 to the LED module 31 of the light source unit 3 as the voltage value of the output voltage of the averaging circuit 88 is smaller. The switching element is controlled to be turned on and off. When a voltage value corresponding to a PWM signal with a duty ratio of 100% is input from the averaging circuit 88, the control IC controls the current output from the lighting circuit 80 so that the light output of the light source unit 3 is 100%. To do. When a voltage value corresponding to a PWM signal with a duty ratio of 50% is input from the averaging circuit 88, the control IC controls the current output from the lighting circuit 80 so that the light output of the light source unit 3 is 50%. To do. When a voltage value corresponding to a PWM signal with a duty ratio of 10% is input from the averaging circuit 88, the control IC controls the current output from the lighting circuit 80 so that the light output of the light source unit 3 is 10%. To do. The control IC does not flow current from the lighting circuit 80 to the light source unit 3 when the voltage value corresponding to the PWM signal with the duty ratio of 0% is input from the averaging circuit 88.

The luminaire 1 includes a plurality (here, two) of detection circuits 13 (see FIG. 1) whose detection values change according to temperature changes of the plurality of light source units 3 as described above.

Each of the plurality of detection circuits 13 includes a temperature sensitive element RT whose electric resistance value changes according to the temperature of the light source unit 3. Each of the plurality of detection circuits 13 changes in detection value in accordance with a change in the electric resistance value of the temperature sensitive element RT. The plurality of detection circuits 13 are in one-to-one correspondence with the plurality of light source units 3. Hereinafter, for convenience of explanation, the detection circuit 13 whose detection value changes according to the temperature change of the light source unit 3A out of the two detection circuits 13 is referred to as a first detection circuit 13A and is detected according to the temperature change of the light source unit 3B. The detection circuit 13 whose value changes may be referred to as a second detection circuit 13B.

Each detection circuit 13 includes a plurality of (here, two) temperature sensing elements RT so as to correspond to a plurality of (here, two) LED modules 31 on a one-to-one basis, and further includes a resistance element R0. . In the detection circuit 13, a resistance element R0 and a plurality of temperature sensing elements RT are connected in series. Each of the plurality of temperature sensing elements RT is an NTC thermistor (Negative Temperature Coefficient Thermistor), and is arranged such that the electric resistance value changes according to the temperature of the corresponding LED module 31 among the plurality of LED modules 31. . More specifically, each of the plurality of temperature sensing elements RT is mounted on the circuit board 312 of the corresponding LED module 31 among the plurality of LED modules 31. Here, the temperature sensitive element RT is disposed on the circuit board 312 in the vicinity of the LED 311 that is closest to the above-described shaft portion 61 (see FIG. 14) among the five LEDs 311.

As described above, the luminaire 1 includes the control power supply circuit 83 that converts the DC voltage supplied from the battery pack 9 into a predetermined control voltage (for example, 5 V) by DC-DC conversion and supplies it to the detection circuit 13 and the control unit 85. Prepare. In the detection circuit 13, the resistance element R 0 is connected to the output terminal 831 on the high potential side of the pair of

output terminals

831 and 832 of the control power supply circuit 83. The resistance element R0 is housed in the base 2. More specifically, the resistance element R0 is mounted on a printed wiring board 82 housed in the base 2.

The control unit 85 includes, for example, an A / D conversion unit 850 and an output unit 853. The A / D conversion unit 850 converts the analog first voltage signal, which is the detection value of the detection circuit 13, into a digital second voltage signal and outputs the digital second voltage signal. The output unit 853 outputs a PWM signal corresponding to the second voltage signal output from the A / D conversion unit 850. The lighting circuit 80 changes the current value of the current supplied to the LED module 31 according to the PWM signal. More specifically, the lighting circuit 80 changes the current value of the current supplied to the LED module 31 based on the voltage value of the output voltage of the averaging circuit 88 described above.

In the control unit 85, the connection point between the resistance element R0 and the temperature sensing element RT in each of the plurality of detection circuits 13 is connected to the A / D conversion unit 850. Here, the control unit 85 includes, for example, a first switching unit 851 and a second switching unit 852 for alternately A / D converting the detection values of the two detection circuits 13. The first switching unit 851 is connected to a first terminal to which the low-temperature-side temperature sensing element RT is connected among the two temperature sensing elements RT of the first detection circuit 13A in the microcomputer included in the control unit 85. The second switching unit 852 is connected to a second terminal to which the low-temperature-side temperature sensing element RT is connected among the two temperature sensing elements RT of the second detection circuit 13B in the microcomputer included in the control unit 85. The first switching unit 851 is configured to be able to switch between a state in which the first terminal is connected to the ground of the microcomputer and a state in which the first terminal is in a high impedance state (open). The second switching unit 852 is configured to switch between a state in which the second terminal is connected to the ground of the microcomputer and a state in which the second terminal is in a high impedance state (open). The control unit 85 has a first state and a second state as control states of the first switching unit 851 and the second switching unit 852. In the first state, the first terminal is connected to the ground of the microcomputer, and the second terminal is in a high impedance state. In the second state, the second terminal is connected to the ground of the microcomputer, and the first terminal is in a high impedance state. Therefore, the control unit 85 controls the first switching unit 851 and the second switching unit 852 so that the first state and the second state are alternately repeated, so that one A / D conversion unit 850 can perform two operations. The detection value of the detection circuit 13 can be A / D converted alternately.

When the detection value by the detection circuit 13 reaches a first threshold value corresponding to a first specified temperature t1 (for example, 100 ° C.) of the module temperature (the temperature of the LED module 31), the controller 85 causes the lighting circuit 80 to detect the LED module 31. The light output is reduced (see FIG. 2). Here, for example, the control unit 85 reduces the light output of the LED module 31 to 10% of the light output during rated lighting (reducing the light output ratio to 10%). After that, when the detection value by the detection circuit 13 reaches the second threshold value corresponding to the second specified temperature t2 (for example, 120 ° C.) higher than the first specified temperature t1 of the module temperature, the control unit 85 causes the lighting circuit 80 to The LED module 31 is turned off (see FIG. 2). Thereby, in the lighting fixture 1, the temperature rise of the light source unit 3 is suppressed, for example, the lifetime shortening of LED311, the softening of the case 32, etc. are suppressed.

The control unit 85 further includes an acquisition unit 854 that acquires temperature information of the battery pack 9 from the battery pack 9. When the temperature information (battery temperature) acquired by the acquisition unit 854 reaches the third threshold value corresponding to the third specified temperature t3 (for example, 55 ° C.), the control unit 85 reduces the light output of the LED module 31 by the lighting circuit 80. (See FIG. 2). Here, for example, the control unit 85 reduces the light output of the LED module 31 to 10% of the light output during rated lighting. Thereafter, when the temperature information acquired by the acquisition unit 854 reaches a fourth threshold value corresponding to a fourth specified temperature t4 (for example, 65 ° C.) higher than the third specified temperature t3, the control unit 85 causes the lighting circuit 80 to display the LED. The module 31 is turned off (see FIG. 2). Thereby, in the lighting fixture 1, it becomes possible to suppress the lifetime shortening etc. of the battery pack 9 currently used, for example.

The above embodiment is only one of various embodiments of the present invention. The above-described embodiment can be variously changed according to the design or the like as long as the object of the present invention can be achieved.

For example, although the lighting fixture 1 includes two light source units 3, the number of the light source units 3 is not limited to two, and may be three or more, or one.

Further, the circuit board 312 is not limited to a printed wiring board, and may be, for example, MID (Molded Interconnect Device).

Further, the temperature sensing element RT is not limited to the NTC thermistor, but may be a PTC thermistor (Positive （Coefficient Thermistor), for example. Further, the temperature sensing element RT is not limited to the thermistor, and may be a resistance bolometer, for example.

The detection circuit 13 includes two temperature sensing elements RT, but is not limited thereto, and may be configured to include only one temperature sensing element RT. The detection circuit 13 includes the resistance element R0, but does not necessarily include the resistance element R0.

As is clear from the above-described embodiment and the like, the lighting apparatus (1) according to the first aspect includes a light source unit (3), a lighting circuit (80), a detection circuit (13), and a control unit (85). And comprising. The light source unit (3) includes an LED module (31) and a case (32) that houses the LED module (31). The lighting circuit (80) is powered by the battery pack (9) and lights the LED module (31). The detection circuit (13) includes a temperature sensing element (RT) whose electric resistance value changes according to the temperature of the light source unit (3), and the detection value varies according to a change in the electric resistance value of the temperature sensing element (RT). Change. When the detection value by the detection circuit (13) reaches the first threshold value corresponding to the first specified temperature (t1), the control unit (85) reduces the light output of the LED module (31) by the lighting circuit (80). . When the detection value by the detection circuit (13) reaches the second threshold value corresponding to the second specified temperature (t2) higher than the first specified temperature (t1), the controller (85) causes the lighting circuit (80) to The LED module (31) is turned off.

The lighting apparatus (1) according to the first aspect can improve reliability with respect to temperature.

In the lighting apparatus (1) according to the second aspect, in the first aspect, the light source unit (3) has a plurality of LED modules (31) in the case (32). The detection circuit (13) includes a plurality of temperature sensing elements (RT) so as to correspond to the plurality of LED modules (31) on a one-to-one basis, and further includes a resistance element (R0). In the detection circuit (13), a resistance element (R0) and a plurality of temperature sensing elements (RT) are connected in series.

In the lighting apparatus (1) according to the second aspect, it is possible to further improve the reliability with respect to the temperature.

In the lighting device (1) according to the third aspect, in the second aspect, each of the plurality of LED modules (31) includes an LED (311) and a circuit board (312) on which the LED (311) is mounted. Have. Each of the plurality of temperature sensitive elements (RT) is mounted on the circuit board (312) of the corresponding LED module (31) among the plurality of LED modules (31).

In the lighting apparatus (1) according to the third aspect, it is possible to further improve the reliability with respect to the temperature.

In the lighting fixture (1) according to the fourth aspect, in the third aspect, each of the plurality of temperature sensing elements (RT) is an NTC thermistor, and the corresponding LED module (31) among the plurality of LED modules (31). It is arranged so that the electric resistance value changes according to the temperature of 31). The lighting fixture (1) according to the fourth aspect is a control that converts the DC voltage supplied from the battery pack (9) into a predetermined control voltage by DC-DC conversion and applies it to the detection circuit (13) and the control unit (85). A power supply circuit (83) is provided. In the detection circuit (13), the resistance element (R0) is connected to the output terminal (831) on the high potential side of the pair of output terminals (831, 832) of the control power supply circuit (83).

In the lighting apparatus (1) according to the fourth aspect, it is possible to further improve the reliability with respect to the temperature. Moreover, in the lighting fixture (1) according to the fourth aspect, when at least one temperature sensing element (RT) of the plurality of temperature sensing elements (RT) of the detection circuit (13) is short-circuited, the lighting circuit (80 ) Can reduce the light output of the LED module (31) or turn off the LED module (31).

In the lighting device (1) according to the fifth aspect, in the fourth aspect, the control unit (85) includes an A / D conversion unit (850) and an output unit (853). The A / D converter (850) converts an analog first voltage signal, which is a detection value of the detection circuit (13), into a digital second voltage signal and outputs the digital second voltage signal. The output unit (853) outputs a PWM signal corresponding to the second voltage signal output from the A / D conversion unit (850). The lighting circuit (80) changes the current value of the current supplied to the LED module (31) according to the PWM signal.

In the lighting apparatus (1) according to the fifth aspect, it becomes possible to improve the reliability with respect to the temperature.

The lighting fixture (1) according to the sixth aspect includes the base (2) in any one of the second to fifth aspects. The base (2) has a mounting portion (10) to which the battery pack (9) is detachably mounted. The control unit (85), the lighting circuit (80), and the resistance element (R0) are housed in the base (2).

In the lighting fixture (1) according to the sixth aspect, the light source unit (3) is compared to the case where the control unit (85), the lighting circuit (80), and the resistance element (R0) are provided in the light source unit (3). ), Temperature rise of the control unit (85), the lighting circuit (80), and the resistance element (R0) can be suppressed. Therefore, in the lighting fixture (1) which concerns on a 6th aspect, it becomes possible to aim at the further improvement of the reliability with respect to temperature.

The lighting fixture (1) according to a seventh aspect further includes a connecting device (4) that includes a plurality of light source units (3) and connects the plurality of light source units (3) to the base (2) in the sixth aspect. Prepare. The coupling device (4) has a plurality of hinge devices (5) and a plurality of rotating mechanisms (6). The plurality of hinge devices (5) includes a plurality of light source units (3) so that each of the plurality of light source units (3) can be rotated between the first position and the second position around the first axis (50). 3) is connected to the base (2). The plurality of rotation mechanisms (6) includes a plurality of light source units (3) such that each of the plurality of light source units (3) can rotate around a second axis (60) intersecting the first axis (50). Are connected to a plurality of hinge devices (5). The plurality of hinge devices (5) are configured to have different rotation directions when each of the plurality of light source units (3) rotates from the first position to the second position. The plurality of rotation mechanisms (6) includes a plurality of light source units (3) gathered when each of the plurality of light source units (3) is in the first position. 3222) defines a rotation range around the second axis (60) of each of the plurality of light source units (3) so that the reference state is directed outward.

In the luminaire (1) according to the seventh aspect, more various light distributions can be realized, and not only the position of each of the plurality of light source units (3) but also reliability with respect to temperature can be improved. It becomes.

In the lighting fixture (1) according to the eighth aspect, in the seventh aspect, each of the plurality of hinge devices (5) is a ring-shaped hinge portion (54) rotatable around the first axis (50). And the ring part (52), and the arm (55) that connects the hinge part (54) and the ring part (52) and protrudes radially outward of the hinge part (54) and the ring part (52). . Each of the plurality of rotating mechanisms (6) includes a cylindrical shaft portion (61) and a bearing portion (62). Each shaft portion (61) protrudes from a surface (35) facing the arm (55) in each of the plurality of light source units (3). Each bearing portion (62) is provided on the arm (55) and rotatably holds the shaft portion (61) to define the second shaft (60). The lighting fixture (1) according to the eighth aspect has a pair of power supply lead wires (391) and a pair of wiring lead wires (392). The pair of power supply leads (391) connect the LED module (31) and the lighting circuit (80) in the case (32) of the light source unit (3). One pair of wiring leads (392) is connected to each end of the series circuit of the plurality of temperature sensing elements (RT) in the detection circuit (13). A pair of power supply lead wires (391) and a pair of wiring lead wires (392) pass through the shaft portion (61).

In the lighting fixture (1) according to the eighth aspect, the plurality of light source units (3) rotate around the second axis (60) when each of the plurality of light source units (3) is in the first position. Can be prohibited. Moreover, in the lighting fixture (1) which concerns on an 8th aspect, it becomes possible to make a 1st axis | shaft (50) and a 2nd axis | shaft (60) orthogonal. Moreover, in the lighting fixture (1) according to the eighth aspect, it is possible to prevent the pair of power supply lead wires (391) and the pair of wiring lead wires (392) from being twisted.

In the lighting device (1) according to the ninth aspect, in any one of the first to eighth aspects, the control unit (85) acquires temperature information of the battery pack (9) from the battery pack (9). An acquisition unit (854) is further included. When the temperature information acquired in the acquisition unit (854) reaches the third threshold value corresponding to the third specified temperature (t3), the control unit (85) outputs the light output of the LED module (31) by the lighting circuit (80). Reduce. When the temperature information acquired in the acquisition unit (854) reaches the fourth threshold value corresponding to the fourth specified temperature (t4) higher than the third specified temperature (t3), the control unit (85) reaches the lighting circuit (80). ) To turn off the LED module (31).

In the lighting fixture (1) according to the ninth aspect, it is possible to suppress the temperature rise of the battery pack (9), and it is possible to improve the reliability with respect to the temperature.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Base 3 Light source unit 30 Light source 31 LED module 311 LED
312 Circuit board 32 Case 3212 Back surface 3222 Light emitting surface 33 Projection 35 Opposing surface 4 Connecting device 5 Hinge device 50 First shaft 52 Ring portion 54 Hinge portion 55 Arm 6 Rotating mechanism 60 Second shaft 61 Shaft portion 62 Bearing portion 80 Lighting circuit 83 Control power supply circuit 831 Output end 832 Output end 85 Control unit 850 A / D conversion unit 853 Output unit 854 Acquisition unit 9 Battery pack 10 Mounting unit 391 Lead wire for power supply 392 Lead wire for wiring RT Temperature sensing element R0 Resistance element t1 First 1 specified temperature t2 2nd specified temperature t3 3rd specified temperature t4 4th specified temperature

Claims

A light source unit having an LED module and a case housing the LED module;
A lighting circuit that is powered by a battery pack and lights the LED module;
A detection circuit that includes a temperature-sensitive element whose electrical resistance value changes according to the temperature of the light source unit, and whose detection value changes according to a change in the electrical resistance value of the temperature-sensitive element;
When the detection value by the detection circuit reaches a first threshold value corresponding to the first specified temperature, the lighting circuit reduces the light output of the LED module and corresponds to a second specified temperature higher than the first specified temperature. A control unit that turns off the LED module by the lighting circuit when the second threshold value is reached,
lighting equipment.
The light source unit has a plurality of the LED modules in the case,
The detection circuit includes a plurality of the temperature sensing elements so as to correspond to the plurality of LED modules on a one-to-one basis, and further includes a resistance element,
In the detection circuit, the resistance element and the plurality of temperature sensitive elements are connected in series.
The lighting fixture according to claim 1.
Each of the plurality of LED modules is
LED,
A circuit board on which the LED is mounted,
Each of the plurality of temperature sensing elements is mounted on the circuit board of the corresponding LED module among the plurality of LED modules.
The lighting fixture according to claim 2.
Each of the plurality of temperature sensing elements is an NTC thermistor, and is arranged such that an electric resistance value changes according to a temperature of a corresponding LED module among the plurality of LED modules.
The lighting apparatus includes a control power supply circuit that converts a DC voltage supplied from the battery pack into a predetermined control voltage by DC-DC conversion and supplies the DC voltage to the detection circuit and the control unit.
In the detection circuit, the resistance element is connected to an output terminal on a high potential side among a pair of output terminals of the control power supply circuit.
The lighting fixture according to claim 3.
The controller is
An A / D converter that converts an analog first voltage signal, which is a detection value of the detection circuit, into a digital second voltage signal and outputs the digital second voltage signal;
An output unit that outputs a PWM signal corresponding to the second voltage signal output from the A / D conversion unit,
The lighting circuit changes a current value of a current supplied to the LED module according to the PWM signal.
The lighting fixture according to claim 4.
A base having a mounting portion to which the battery pack is detachably mounted;
The control unit, the lighting circuit and the resistance element are housed in the base,
The lighting fixture according to any one of claims 2 to 5.
A plurality of light source units;
A connection device for connecting the plurality of light source units to the base;
The connecting device is
A plurality of hinge devices that couple the plurality of light source units to the base so that each of the plurality of light source units can be rotated between a first position and a second position about a first axis;
A plurality of rotation mechanisms for coupling each of the plurality of light source units to the plurality of hinge devices so that each of the plurality of light source units can be rotated around a second axis intersecting the first axis; Have
The plurality of hinge devices are configured to have different rotation directions when each of the plurality of light source units rotates from the first position to the second position,
The plurality of rotation mechanisms include a reference state in which the plurality of light source units are gathered when the plurality of light source units are in the first position, and the light emission surfaces of the plurality of light source units face outward. A range of rotation about the second axis of each of the plurality of light source units is defined,
The lighting fixture according to claim 6.
Each of the plurality of hinge devices is
A ring-shaped hinge part and a ring part rotatable around the first axis;
An arm that connects the hinge part and the ring part and protrudes radially outward of the hinge part and the ring part;
Each of the plurality of rotation mechanisms is
A cylindrical shaft projecting from a surface facing the arm in each of the plurality of light source units;
A bearing portion provided on the arm and rotatably holding the shaft portion and defining the second shaft;
The lighting fixture is:
A pair of power supply leads for connecting the LED module and the lighting circuit in the case of the light source unit;
A pair of wiring leads connected to each of both ends of the series circuit of the plurality of temperature sensing elements in the detection circuit,
The pair of power supply lead wires and the pair of wiring lead wires pass through the shaft portion,
The lighting fixture according to claim 7.
The control unit further includes an acquisition unit that acquires temperature information of the battery pack from the battery pack, and when the temperature information acquired in the acquisition unit reaches a third threshold value corresponding to a third specified temperature, the lighting circuit The light output of the LED module is reduced by the above, and when the fourth threshold value corresponding to the fourth specified temperature higher than the third specified temperature is reached, the LED module is turned off by the lighting circuit.
The luminaire according to any one of claims 1 to 8.