JP2012155920A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of cooling an LED and a substrate with the LED mounted by rotating a fan without consuming power.SOLUTION: A radiator 2 is fixed to a substrate-mounting plate 4 with a substrate 7 attached with an LED 8 mounted. Inside an inner space 11 of the radiator 2, a thermo-sensitivity actuating mechanism part 32 operated in accordance with temperature change inside the inner space 11, a fan-driving mechanism part 33 operated by the thermo-sensitivity actuating mechanism part 32, and a fan 34 rotationally driven by the fan-driving mechanism part 33 are housed. The substrate 7 with the LED 8 mounted and the LED 8 can be cooled by air flow generated by the fan 34 rotationally driven by the fan-driving mechanism part 33. Therefore, a motor is not necessary for rotating the fan 34, no power is consumed for rotating the motor, and thus, energy saving can be achieved.

Description

The present invention relates to an illumination device (for example, an LED bulb) using an LED as a light emitting element.

In recent years, LED bulbs that consume less power and have a longer life than incandescent bulbs are used in place of incandescent bulbs in general households.

Such an LED bulb is a motor in order to prevent the temperature of the LED and the circuit board on which the LED is mounted from rising due to the heat generated from the LED, thereby reducing the light emission amount of the LED and the life of the LED. There is a substrate in which an LED is mounted and an LED is cooled by an air flow generated by the rotating fan by rotating the fan (see Patent Documents 1 to 3).

JP 2010-86708 A JP 2010-86709 A JP 2010-157506 A

However, a conventional LED bulb that rotates a fan with a motor consumes power corresponding to the power required to rotate the motor, as compared with an LED bulb that does not have a heat dissipation mechanism (fan and motor) of the board on which the LED and LED are mounted. This causes a new problem that will increase.

Therefore, an object of the present invention is to provide an illumination device that can cool a LED and a board on which the LED is mounted by rotating a fan without consuming electric power.

As shown in FIG. 1 to FIG.
A substrate mounting plate 4 to which a substrate 7 mounted with LEDs 8 is mounted;
A radiator 2 fixed to the substrate mounting plate 4 so that heat generated by the lighting of the LED 8 is transferred through the substrate mounting plate 4;
The air is accommodated in the internal space 11 of the heat radiating body 2, the outside air is sucked into the internal space 11 of the heat radiating body 2, and the air in the internal space 11 of the heat radiating body 2 is discharged outside the heat radiating body 2. Then, an air flow is generated in the internal space 11 of the heat dissipating body 2 to promote heat dissipating from the substrate mounting plate 4 and the heat dissipating body 2 and to cool the substrate 7 and the LED 8 on which the LED 8 is mounted. Facilitating means 12,
A globe 10 that is attached to the substrate mounting plate 4 so as to cover the substrate 7 on which the LED 8 is mounted and that transmits the light emitted from the LED 8 is provided.

And in the illuminating device 1 of this invention,
(1). The heat dissipation promoting means 12
By means of a temperature sensing mechanism 32 that operates according to temperature changes in the internal space 11 of the radiator 2, a fan drive mechanism 33 that is actuated by the temperature sensing mechanism 32, and a fan drive mechanism 33. And a fan 34 to be rotated.

(1) -1. The temperature sensitive operating mechanism 32 is
The operation plate 37 is sandwiched between the shape memory alloy spring 35 and the bias spring 36, and
When the temperature in the internal space 11 of the radiator 2 is higher than before the LED 8 is turned on and the temperature of the shape memory alloy spring 35 is higher than before the LED 8 is turned on, the shape memory alloy spring 35 is moved to the bias. The spring 36 is pushed and shrunk and extended, and the operating plate 37 is slid along a guide rod 38 installed in the internal space 11 of the radiator 2 with the shape memory alloy spring 35 and the bias spring 36 sandwiched therebetween. It is supposed to move.

(1) -2. The fan drive mechanism 33 is
The slide plate 44 is connected to the operation plate 37 via a drive spring 43 and is slidable along the guide rod 38. The slide plate 44 is screwed into a spiral groove of the nut portion 46 of the slide plate 44. The shape memory alloy spring comprising: a rotary shaft 21 on which a spiral protrusion is formed and the fan 34 is attached; and a magnet 45 that holds the slide plate 44 in a retracted position on the end side of the rotary shaft 21. The operating plate 37 slides in accordance with the displacement of 35 in the extending direction, and the operating plate 37 pulls the slide plate 44 held at the retracted position by the magnet 45 via the driving spring 43. When the spring force of the driving spring 43 that pulls the slide plate 44 becomes larger than the magnetic force of the magnet 45, The slide plate 44 is pulled by the spring force of the drive spring 43 to slide at a stroke along the guide rod 38 from the retracted position, and the rotary shaft 21 is rotated by the nut portion 46 of the slide plate 44. The fan 3 attached to the rotary shaft 21
4 rotates together with the rotating shaft 21.

Moreover, as shown in FIG. 4, the lighting device 1 according to the present invention is configured so that the fan 34 is connected to the rotating shaft 2.
1 is attached via a one-way clutch 50, and the fan 34 is integrated with the rotary shaft 21 when the rotary shaft 21 is rotated in accordance with the displacement of the shape memory alloy spring 35 in the extension direction. When the rotating shaft 21 that has been rotating has stopped, the fan 34 continues to rotate according to the law of inertia.

In the lighting device of the present invention, the fan driving mechanism is operated by the temperature-sensitive operating mechanism that operates according to the temperature change in the internal space of the radiator, the fan is rotated by the fan driving mechanism, and the fan rotates. Since the LED mounted substrate and the LED can be cooled by the air flow generated by the operation, a motor for rotating the fan becomes unnecessary, and the power for rotating the motor is not consumed, thereby saving energy. be able to.

Further, in the lighting device of the present invention, no motor is used to rotate the fan, so that noise due to the operating sound of the motor does not occur.

It is a longitudinal cross-sectional view of the illuminating device which concerns on 1st Embodiment of this invention, and is a figure which shows the state before the action | operation of the heat dissipation promotion means of an illuminating device. It is a longitudinal cross-sectional view of the illuminating device which concerns on 1st Embodiment of this invention, and is a figure which shows the 1st state at the time of the action | operation of the heat dissipation promotion means of an illuminating device. It is a longitudinal cross-sectional view of the illuminating device which concerns on 1st Embodiment of this invention, and is a figure which shows the 2nd state at the time of the action | operation of the heat dissipation promotion means of an illuminating device. It is a longitudinal cross-sectional view of the illuminating device which concerns on 2nd Embodiment of this invention, and is a figure which shows the state before the action | operation of the heat dissipation promotion means of an illuminating device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
(Structure of lighting device)
FIG. 1 is a longitudinal sectional view of a lighting device 1 according to the first embodiment of the present invention. The lighting device 1 shown in FIG. 1 includes a substantially cylindrical heat radiating body 2 formed of a metal having a high thermal conductivity such as aluminum or an aluminum alloy or a heat conductive resin, and an opening end 3 on one end side of the heat radiating body 2. A fixed substrate mounting plate 4, a case 6 fixed to the opening 5 at the other end of the radiator 2, a substrate 7 mounted on the outer surface 4 a of the substrate mounting plate 4, and an outer surface 7 a of the substrate 7 An LED (light emitting element) 8 mounted on the substrate, a globe 10 fixed to the substrate mounting plate 4 so as to cover the substrate 7 and the LED 8, a heat dissipation promoting means 12 accommodated in the internal space 11 of the radiator 2, It has.

The radiator 2 includes a cylindrical portion 13 and fins 14 and 15 extending from the one end side opening end 3 of the cylindrical portion 13 toward the other end side opening end 5. A plurality of fins 14 and 15 are formed at equal intervals along the circumferential direction of the inner peripheral surface 13 a and the outer peripheral surface 13 b of the cylindrical portion 13. And
A plurality of first vent holes 16 that communicate between the inside and the outside of the cylindrical portion 13 are formed on one end side of the cylindrical portion 13 between the adjacent fins 14 and 14 (15, 15) along the circumferential direction of the cylindrical portion 13. Yes. In addition, a plurality of second vents 17 communicating with the inside and outside of the cylindrical portion 13 are provided along the circumferential direction of the cylindrical portion 13 on the other end side of the cylindrical portion 13 between the adjacent fins 14 and 14 (15, 15). Is formed.

The board mounting plate 4 is formed in a disc shape so as to have the same outer diameter as that of the one end side of the radiator 2, and the whole is made of the same material as the radiator 2. This board mounting plate 4 is
By engaging the positioning protrusion 18 formed on the back surface (inner surface) 4b side with the positioning step 20 formed on the radially outer end on one end side of the radiator 2, the center thereof is the cylindrical portion of the radiator 2. 13
Is fixed to the radiator 2 with an adhesive or a screw or the like. The substrate mounting plate 4 has a first bearing 22 that rotatably supports one end side of the rotating shaft 21 on the back surface 4b side and at the center position thereof. A substrate 7 on which one or a plurality of LEDs 8 are mounted is attached to the outer surface (upper surface in FIG. 1) 4a of the substrate mounting plate 4. Further, at a position near the outer peripheral end of the outer surface 4 a of the substrate mounting plate 4, a globe engaging projection 23 that engages with the inner peripheral surface of the opening end of the globe 10 is formed in a ring shape. The substrate 7 is provided with a conductive pattern (not shown) that electrically connects lead wires (not shown) and the LEDs 8.

The globe 10 is formed in a hemispherical shape with a material such as plastic or glass that can transmit light emitted from the LED 8, and its opening end is engaged with the globe engaging protrusion 23 of the substrate mounting plate 4. It is fixed to the mounting plate 4 with an adhesive or the like. In addition, the globe 10 is LE.
It is preferable that the light from D8 is emitted in a diffused state.

The case 6 is made of an insulating plastic so that the external shape is substantially tapered. A substantially disc-shaped radiator mounting portion 24 is formed on one end side (large diameter side) of the case 6, and a base 25 is fixed to the other end side (small diameter side) of the case 6. The radiator mounting portion 24 of the case 6 is fixed to the other end side opening end 5 of the radiator 2 and closes the other end side opening end 5 of the radiator 2. Further, the radiator mounting portion 24 of the case 6 is provided at the other end side opening end 5 of the radiator 2.
An engaging step portion 26 is formed to be engaged. The engagement step portion 26 is formed by the cylindrical portion 1 of the radiator 2.
3 has a convex portion 26a fitted on the inner peripheral side, and a radiator support portion 26b that is located on the outer peripheral side of the convex portion 26a and contacts the end surface of the cylindrical portion 13 of the radiator 2. . here,
The convex portion 26 a can align the center of the radiator mounting portion 24 of the case 6 and the center of the cylindrical portion 13 of the radiator 2. In addition, a second bearing 27 that rotatably supports the other end side of the rotating shaft 21 is attached to the radiator mounting portion 26 at a position facing the inner space 11 of the radiator 2 at the center thereof. The base 25 is formed with a thread on the outer peripheral surface to be screwed into a lamp socket (not shown).

A lighting circuit (not shown) for the LED 8 is accommodated inside the case 6, and the lighting circuit and the base 25 are electrically connected by a lead wire (not shown). The lighting circuit includes a hole 28 passing through the center of the radiator mounting portion 24 of the case 6 and a hole 3 along the axis of the rotating shaft 21.
0 and a lead wire (not shown) inserted into a hole 31 penetrating the center of the board mounting plate 4 are electrically connected to the conductive pattern of the board 7 so that the LED 8 mounted on the board 7 can be controlled to be lit. .

The heat radiation promoting means 12 includes a temperature sensing mechanism 32 that operates in response to a temperature change in the internal space 11 of the radiator 2, and a fan drive mechanism that is driven by the temperature sensing mechanism 32 to rotate the fan. And a fan 34 that is rotated by the fan drive mechanism 33.

The temperature sensitive operation mechanism 32 is a bias type bidirectional element that sandwiches the operation plate 37 between the shape memory alloy spring 35 and the bias spring 36, and is housed in the internal space 11 of the radiator 2. In the temperature-sensitive operation mechanism 32, a shape memory alloy spring 35 (for example, a Ni—Ti spring) is disposed between the substrate attachment plate 4 and the operation plate 37, and a plurality of guide rods 38 are provided on the substrate attachment plate 4. A bias spring 36 is disposed between the spring support plate 40 and the operation plate 37 fixed to each other, and the operation plate 37 is guided by a guide rod 38 to be slidable. In addition, vent holes 41 and 42 are formed in the central portion of the operating plate 37 and the spring support plate 40 of the temperature-sensitive operating mechanism portion 32 so that a sufficient gap is generated between the rotating shaft 21 and each. Moreover, the temperature sensitive operation mechanism part 3
The outer peripheral surface of the second operation plate 37 is formed to have a smaller diameter than that of the radiator 2, and a gap is formed between the outer peripheral surface and the fins 14 of the radiator 2. Such a temperature-sensitive operation mechanism 32
When the temperature in the internal space 11 of the radiator 2 rises, the shape memory alloy spring 35 stretches against the spring force of the bias spring 36 (the spring length is increased), and the shape memory alloy spring 35 When the temperature in the internal space 11 of the heat radiating body 2 is lowered in the extended state, the shape memory alloy spring 35 is compressed by the spring force of the bias spring 36, and such a shape memory alloy spring 35 is used.
As the bias spring 36 is displaced, the operating plate 37 moves. Note that a plurality (at least a pair) of the shape memory alloy spring 35 and the bias spring 36 are arranged around the rotation shaft 21.

The fan drive mechanism 33 is provided between the board mounting plate 4 and the operation plate 37 and the shape memory alloy spring 3.
The slide plate 44 is disposed on the radially inward side of 5 and is connected to the operating plate 37 by a driving spring 43, and the tensile force generated in the driving spring 43 is a predetermined value (magnet 45).
A magnet 45 that holds the slide plate 44 in the retracted position on the side of the substrate mounting plate 4 until it reaches a force larger than the magnetic force of the magnetic field, and the rotary shaft 21 that is rotated in accordance with the movement of the slide plate 44. .

In the fan drive mechanism 33, the slide plate 44 is slidably engaged with the guide rod 38 at the outer peripheral end side, the nut portion 46 at the center is fitted to the rotary shaft 21, and one end is fixed to the operation plate 37. The other end of the drive spring 43 is fixed. The nut portion 46 of the slide plate 44 is formed with a spiral groove (not shown) that is screwed into a spiral projection (not shown) of the rotary shaft 21, and is slid and guided by the guide rod 38. Then, the rotating shaft 21 is rotated. A plurality (at least a pair) of drive springs 43 are arranged around the rotation shaft 21.

At least a pair of magnets 45 are disposed between the substrate mounting plate 4 and the slide plate 44. The magnet 45 includes a first magnet piece 45 a fixed to the back surface 4 b of the substrate mounting plate 4 and a second magnet piece 45 b fixed to the surface of the slide plate 44 facing the substrate mounting plate 4. Yes. And the magnet 45 is the slide plate 4 by the force (magnetic force) which the 1st magnet piece 45a and the 2nd magnet piece 45b attract.
4 is held at the retracted position in FIG.

One end of the rotary shaft 21 is rotatably supported by a first bearing 22 attached to the board mounting plate 4, and the other end thereof is rotatably supported by a second bearing 27 attached to a radiator mounting portion 24 of the case 6. Has been. Further, the rotating shaft 21 has a fan 34 fixed at a position in the vicinity of the second bearing 27, and a spiral protrusion (not shown) is formed on the outer surface between the fan 34 and the first bearing 22. The spiral protrusion is screwed into a spiral groove (not shown) of the nut portion 46. The rotating shaft 21 is a hollow shaft. And the hole 3 of the center part of this rotating shaft 21
In 0, a lead wire (not shown) for connecting a lighting circuit (not shown) in the case 6 and the substrate 7 is accommodated.

The fan 34 is formed with a plurality of blades 48 radially around the boss portion 47 and rotates integrally with the rotary shaft 21 to generate an air flow from the radially inner side to the radially outer side. Functions as a fan. The fan 34 is made of a material such as plastic or aluminum that is lighter than iron.

(Activation of heat dissipation promotion means)
Next, the operation of the heat radiation promoting means 12 will be described with reference to FIGS. 1 shows LED 8
Is shown, and the entire lighting device 1 including the LED 8 and the substrate 7 is at room temperature (25 ° C. in this embodiment). As shown in FIG. 1, the operation plate 37 is an LED.
Before the lighting of 8, the spring force of the shape memory alloy spring 35 and the bias spring 36 is balanced and located at the retracted position. Further, as shown in FIG. 1, the slide plate 44 is held on the substrate mounting plate 4 by a magnet 45.

When the LED 8 is turned on, the LED 8 generates heat, and the heat of the LED 8 is conducted to the radiator 2 and the shape memory alloy spring 35 through the substrate 7 and the substrate mounting plate 4. The heat conducted to the radiator 2 is radiated into the atmosphere through the fins 14 and 15 and is radiated into the internal space 11 of the radiator 2. As a result, the heat of the air in the internal space 11 of the heat radiating body 2 is transmitted to the shape memory alloy spring 35, and the heat is conducted from the board mounting plate 4 to increase the temperature. When the shape memory alloy spring 35 rises in temperature, the shape memory alloy spring 35 compresses and expands the bias spring 36, and the operating plate 3
7 moves with the extension displacement of the shape memory alloy spring 35. When the operating plate 37 slides in the extending direction of the shape memory alloy spring 35, the driving spring 43 is pulled by the operating plate 37 that slides along the guide rod 38. At this time, when the spring force generated in the drive spring 43 (force that pulls the slide plate 44) is smaller than the magnetic force of the magnet 45 that holds the slide plate 44 in the retracted position, the drive spring 43 only extends.
The slide plate 44 is held at the retracted position and does not move, and the rotating shaft 21 and the fan 34 do not rotate (see FIG. 2).

The shape memory alloy spring 35 further rises in temperature, the shape memory alloy spring 35 is further displaced in the extending direction, and the operating plate 37 is further moved in accordance with the displacement of the shape memory alloy spring 35 in the extending direction. When the spring force generated in 43 becomes larger than the magnetic force of the magnet 45, the first magnet piece 45 a and the second magnet piece 45 b that hold the slide plate 44 in the retracted position are separated from each other, and the slide plate 44 is driven by the drive spring 43. The slide plate 44 is slid at a stroke along the guide rod 38 (to the position where it is not pulled by the drive spring 43 instantly) along the guide rod 38 (see FIGS. 2 to 3). As a result, the rotary shaft 21 is rotated vigorously (at high speed) by the nut portion 46 of the slide plate 44 that slides, and the fan 34 rotates vigorously.

When the fan 34 rotates, outside air is sucked into the internal space 11 of the radiator 2 from the first vent 16 of the radiator 2, and the air in the internal space 11 of the radiator 2 is second vented of the radiator 2. It is discharged from the mouth 17 to the outside atmosphere. Due to the intake into the radiator 2 and the exhaust from the radiator 2 as the fan 34 rotates, the fan 34 passes through the ventilation hole 42 of the spring support plate 40 through the ventilation hole 41 of the operating plate 37 from the first ventilation port 16. And an air flow passing through the ventilation hole 42 of the spring support plate 40 through the gap on the outer peripheral side of the operation plate 37 from the first ventilation port 16. Then, the heat in the internal space 11 of the heat radiating body 2 is forcibly discharged to the outside of the heat radiating body 2, and the internal space 11 of the heat radiating body 2 is cooled by the newly introduced outside air. Further, the heat of the board mounting plate 4 is taken away by the air flow flowing through the internal space 11 of the radiator 2. In addition, the fins 14 and 15 of the heat radiating body 2 come into contact with the air flow generated by the rotation of the fan 34, heat dissipation from the fins 14 and 15 of the heat radiating body 2 is promoted, and the heat radiating body 2 is efficiently cooled. As a result, the board mounting plate 4, the board 7 and the LED 8 are efficiently cooled (see FIG. 3).

When the temperature of the shape memory alloy spring 35 decreases to room temperature, the shape memory alloy spring 35 is compressed by the spring force of the bias spring 36, and the operating plate 37 and the slide plate 44 are moved from the operating position of FIG. 3 to the retracted position of FIG. Returning, the slide plate 44 is held on the substrate mounting plate 4 by the magnetic force of the magnet 45. When the slide plate 44 moves from the operating position in FIG. 3 to the retracted position in FIG. 1, the rotary shaft 21 is rotated gently (at low speed) by the nut portion 46 of the slide plate 44.

(Effect of this embodiment)
In the lighting device 1 of the present embodiment, the fan drive mechanism 33 is operated by the temperature-sensitive operation mechanism 32 that operates according to the temperature change in the internal space 11 of the radiator 2, and the fan 3 is operated by the fan drive mechanism 33.
4, the board 7 on which the LED 8 is mounted and the LED 8 can be cooled by the air flow generated by the rotation of the fan 34, so that a motor for rotating the fan 34 becomes unnecessary, and the motor is Electric power for rotation is not consumed and energy saving can be achieved.

Moreover, since the motor is not used for the illuminating device 1 which concerns on this embodiment to rotate the fan 34, the noise resulting from the operating sound of a motor does not arise.

[Second Embodiment]
FIG. 4 is a longitudinal sectional view of the illumination device 1 according to the second embodiment of the present invention.

The illuminating device 1 according to the present embodiment is the same as the illuminating device 1 of the first embodiment except that the fan 34 is attached to the rotary shaft 21 via the one-way clutch 50. The illuminating device 1 according to the present embodiment having such a configuration has the rotating shaft 21 when the slide plate 44 moves from the retracted position to the operating position (the position of the slide plate 44 shown in FIG. 3).
Is rotated by the nut portion 46 of the slide plate 44, the rotary shaft 21 and the fan 34 rotate together via the one-way clutch 50. When the rotary shaft 21 stops, the one-way clutch 50 slips and the fan 34 Continues to rotate according to the law of inertia. As a result, the illuminating device 1 according to the present embodiment has a fan 3 as compared with the illuminating device 1 according to the first embodiment.
The number of rotations of 4 can be increased, and the substrate 7 on which the LEDs 8 are mounted and the LEDs 8 can be more effectively cooled. For the one-way clutch 50, OWC 4-9-6-IN or the like manufactured by Origin Electric Co., Ltd. is used.

[Other variations]
In the lighting device 1 according to each of the above embodiments, the outer diameter dimension on one end side of the radiator 2 and the outer diameter dimension on the other end side are the same dimension. However, the lighting device 1 according to the present invention is not limited to this, and the outer diameter of one end of the radiator 2 is made larger than the outer diameter of the other end, the globe 10 is enlarged, and the substrate 7 is placed on the substrate 7. The number of LEDs 8 to be mounted may be increased, and the amount of light transmitted through the globe 10 may be increased to illuminate more brightly.

In the illuminating device 1 which concerns on said each embodiment, the board | substrate mounting plate 4 may be formed integrally with the heat radiator 2, and you may make it comprise a part of heat radiator 2. FIG.

In the illuminating device 1 according to each of the above embodiments, the fins 14 and 15 are formed in a spiral shape from one end side to the other end side of the cylindrical portion 13 to increase the heat dissipation area and the internal space of the radiator 2. 11 may generate a spiral air flow to improve heat dissipation efficiency.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Radiator, 4 ... Board mounting plate, 7 ... Board, 8 ... LED, 11
...... Internal space, 12 ... Heat dissipation promoting means, 21 ... Rotary shaft, 32 ... Temperature sensing mechanism, 33
…… Fan drive mechanism, 34 …… Fan, 35 …… Shape memory alloy spring, 36 …… Bias spring, 37 …… Operating plate, 38 …… Guide rod, 43 …… Drive spring, 44 …… Slide plate , 45 …… Magnet, 46 …… Nut, 50 …… One-way clutch

Claims (2)

A board mounting plate on which a board on which LEDs are mounted is mounted;
A heat radiator fixed to the board mounting plate so that heat generated by the lighting of the LED is transferred through the board mounting plate;
Accommodated in the internal space of the heat radiating body, sucking outside air into the internal space of the heat radiating body, discharging the air in the internal space of the heat radiating body to the outside of the heat radiating body, An air flow is generated in the space, heat dissipation from the substrate mounting plate and the heat dissipating body is promoted, a substrate on which the LED is mounted, and a heat dissipation promoting means for cooling the LED,
A glove that is attached to the substrate mounting plate so as to cover the substrate on which the LED is mounted, and that transmits light emitted from the LED;
A lighting device comprising:
(1). The heat dissipation promoting means is
A temperature-sensitive operating mechanism that operates according to a temperature change in the internal space of the radiator, a fan driving mechanism that is operated by the temperature-sensitive operating mechanism, and a fan that is rotated by the fan driving mechanism, With
(1) -1. The temperature sensitive operation mechanism part is
The operation plate is sandwiched between the shape memory alloy spring and the bias spring, the temperature in the internal space of the radiator is higher than before the LED is turned on, and the temperature of the shape memory alloy spring is the temperature of the LED. When it rises more than before lighting, the shape memory alloy spring pushes and contracts the bias spring and expands, and the operating plate is sandwiched between the shape memory alloy spring and the bias spring in the internal space of the radiator. It is designed to slide along the installed guide rod,
(1) -2. The fan drive mechanism is
A slide plate that is connected to the operating plate via a drive spring and is slidable along the guide rod, and a helical projection that is screwed into a spiral groove of a nut portion of the slide plate are formed. And a rotation shaft to which the fan is attached, and a magnet for holding the slide plate at a retracted position on the end side of the rotation shaft, and the operation according to the displacement of the shape memory alloy spring in the extension direction. When the plate slides, the operating plate pulls the slide plate held by the magnet in the retracted position via the drive spring, and the spring force of the drive spring pulls the slide plate. When the magnetic force becomes larger than the magnetic force, the slide plate is pulled by the spring force of the driving spring, and the guide is removed from the retracted position. Slide along the rod at once,
The rotating shaft is rotated by the nut portion of the slide plate, and the fan attached to the rotating shaft is rotated together with the rotating shaft.
A lighting device characterized by that. When the fan is attached to the rotating shaft via a one-way clutch and the rotating shaft is rotated in accordance with the displacement of the shape memory alloy spring in the extension direction, the fan is integrated with the rotating shaft. When the rotating shaft that has been rotating has stopped, the fan continues to rotate according to the law of inertia.
The lighting device according to claim 1.

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