JP2010272479A - Rotating light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating light working merely by power supply to a light emission part. <P>SOLUTION: The rotating light is constituted by being equipped with a Stirling engine 18 as an external combustion engine obtaining power by heating and cooling of a gas in a first cylinder 4 from outside and light-emitting diodes (LED) 9. Further, it is so constituted that the LEDs 9 serve both as a light-emitting source and as a heating source for the Stirling engine 18, and that, the Stirling engine 18 serves as a power source of a rotating movement of the LEDs 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating lamp composed of an external combustion engine and a light emitting diode.

  As a technique related to the rotating lamp, there is a method described in Patent Document 1. In this method, a unit composed of a light bulb and a reflector is rotated by a motor to form a rotating lamp.

Japanese Utility Model Publication No.57-178302

  Conventionally used rotating lamps are widely used, and have a necessary and sufficient capacity in general applications. However, since a motor is used to rotate the light bulb and the reflector, it is necessary to prepare a power source separately from the lighting of the light emitting unit, which complicates the circuit.

  Therefore, an object of the present invention is to solve the above-described problems and provide a rotating lamp that functions only by supplying power to a light emitting unit.

  In order to solve the above problems, the present invention comprises an external combustion engine and a light emitting diode that obtain power by heating and cooling a gas in a cylinder from the outside, and the light emitting diode comprises a light emitting source and the external combustion engine. And the external combustion engine is configured to be a power source for the rotational movement of the light emitting diode.

  The light emitting diode may be two or more.

  The light emitting layer of the light emitting diode may be composed of a compound semiconductor containing at least one of aluminum, gallium, indium, and phosphorus.

  ADVANTAGE OF THE INVENTION According to this invention, the rotating lamp which functions only by the electric power supply to a light emission part can be provided.

FIG. 1 is a schematic cross-sectional view of a rotating lamp according to the present invention. FIG. 2 is a schematic plan view of a rotating lamp according to the present invention. FIG. 3 is a schematic bottom view of a rotating lamp according to the present invention. 4A to 4D are explanatory diagrams for explaining the operation order of the rotating lamp.

  As shown in FIG. 1, the rotating lamp 21 includes an external combustion engine 22 and a light emitting diode 9 as a light emitting unit.

  The external combustion engine 22 obtains work by heating and cooling the gas in the first cylinder 4 from the outside, and is generally known as a Stirling engine 18. The Stirling engine 18 has a light emitting diode 9 connected to its heating section (engine lower surface plate 2), and uses the heat generated by the light emitting diode 9 as a heating source. The cooling unit (engine upper surface plate 1) may be forced cooling, but may be natural cooling if not particularly required. The external combustion engine 22 is configured to be a power source for the rotational movement of the light emitting diode 9.

  Specifically, the rotating lamp 21 includes a rotating shaft 12 formed in a columnar shape, and a speed reducer for attaching the Stirling engine 18 to the rotating shaft 12 so that the Stirling engine 18 is rotatable and rotated by the driving force of the Stirling engine 18. 19.

  The speed reducer 19 includes a first bevel gear 13 provided on the rotary shaft 12 and a second bevel gear 11 provided on the crankshaft 6 serving as a drive shaft of the Stirling engine 18 and meshed with the first bevel gear 13. The speed reducer 19 includes a gear box 20 that is rotatably supported by the rotary shaft 12 and that supports the crankshaft 6 rotatably.

  The Stirling engine 18 can obtain higher efficiency as the temperature difference between the heating unit and the cooling unit is larger. Therefore, two or more light emitting diodes 9 are attached to the heating part of the Stirling engine 18 and the amount of heat in the heating part is increased, so that the rotation can be stabilized.

  The light emitting diode 9 serves as a heating source for the external combustion engine and a light emitting source.

  Although there is no restriction | limiting in the material used for the light emitting layer of the light emitting diode 9, when using for a general red rotary lamp, it is preferable to comprise from the compound semiconductor containing either aluminum, gallium, indium, or phosphorus. In addition, for example, a gallium / indium compound semiconductor material may be used to form a blue rotating lamp.

  A light emitting diode does not necessarily need to use a light emitting diode, but a light bulb, for example, emits much of the generated heat as radiant heat and is not suitable as a heat source for a Stirling engine. On the other hand, since the light emitting diode hardly emits light outside the desired wavelength range, the generated heat is not easily released into the space, and can be effectively used as a heat source for the Stirling engine.

  Next, the operation of this embodiment will be described.

  In the Stirling engine 18 in the state shown in FIG. 4A, the pressure of the gas in the first cylinder 4 is lowered by the natural cooling of the engine upper surface plate 1 with the outside air. As a result, as shown in FIG. 4B, the power piston 5 described later is pulled down by the gas pressure, the displacer 3 is pulled up, and the gas above the displacer 3 is moved below the displacer 3. When the second bevel gear 11 is rotated by inertia from this state, the displacer 3 is pulled up to the top dead center as shown in FIG. 4C, and the engine lower surface plate 2 is heated by the light emitting diode 9 so that the first cylinder The pressure of the gas in 4 increases. Thereafter, as shown in FIG. 4D, the power piston 5 is pushed up by the pressure of the gas, and returns to the state of FIG. 4A due to the inertia of the second bevel gear 11. Thereafter, the crankshaft 6 is rotationally driven by repeating the same operation, and the Stirling engine 18 shown in FIG.

  As described above, the first cylinder 4 is configured to include the Stirling engine 18 and the light-emitting diode 9 which are external combustion engines that obtain power by heating and cooling the gas from the outside, and the light-emitting diode 9 includes the light-emitting source and the Stirling engine 18. Since the Stirling engine 18 serves as a power source for the rotational movement of the light emitting diode 9, the light emitting diode 9 can be rotated while being turned on only by supplying power to the light emitting diode 9. .

  Since there are two or more light emitting diodes that serve as a heating source for the Stirling engine 18, the Stirling engine 18 can be sufficiently heated and driven stably.

  In addition, since the light emitting layer of the light emitting diode 9 is made of a compound semiconductor containing at least one of aluminum, gallium, indium, and phosphorus, a red rotating lamp can be easily formed.

  From an engine top plate 1 made of A5052 aluminum alloy having a diameter of 110 mm and a thickness of 3 mm, an engine bottom plate 2 mainly made of copper having a diameter of 110 mm and a thickness of 3 mm, and an acrylic pipe having an inner diameter of 100 mm, an outer diameter of 106 mm, and a height of 22 mm A first cylinder 4 provided between the engine upper surface plate 1 and the engine lower surface plate 2, a displacer 3 made of foamed polystyrene having a diameter of 96 mm and a thickness of 10 mm and housed in the first cylinder 4 so as to be vertically movable, The second cylinder 16 is formed in a cylindrical shape extending in the direction of the engine and communicated with the opening 17 of the engine upper surface plate 1. The second cylinder 16 is made of rubber having a diameter of 20 mm and a thickness of 10 mm and is movably accommodated in the second cylinder 16. The power piston 5 is connected to the displacer 3 via a brass crankshaft 6 and is powered. Using the crankshaft 6 brass converting the rotary motion of the vertical movement of the power piston 5 is connected via a brass connecting rod 8 to the piston 5, to constitute a Stirling engine 18 of the displacer type. The first cylinder 4 and the second cylinder 16 are filled with air (gas) equivalent to 1 atm at room temperature.

  In the Stirling engine 18, the engine upper surface plate 1 serves as a cooling unit, and the engine lower surface plate 2 serves as a heating unit. Ten light emitting diodes 9 serving as a light source and a heat source are attached to the engine lower surface plate 2. The light emitting diode 9 was LXK2-PD12-S00 manufactured by Philips Lumileds Lightning Company. The heat sink of LXK2-PD12-S00 is in contact with the engine lower surface plate 2 via thermal conductive grease, and heat generated from the light emitting diode 9 can be efficiently transmitted to the engine lower surface plate 2. Further, the light from the light emitting diode 9 is reflected only in a specific direction by the reflecting mirror 10 attached to the engine lower surface plate 2.

  The crankshaft 6 connected to the crankshaft 6 on the displacer 3 side and the crankshaft 6 connected to the connecting rod 8 on the power piston 5 side have a phase difference of 90 °.

  A second bevel gear 11 having an outer diameter of 20 mm is attached to the tip of the crankshaft 6 and meshes with the first bevel gear 13 attached to the rotary shaft 12 having a diameter of 30 mm. The second bevel gear 11 moves on the first bevel gear 13. To do. As a result, the Stirling engine 18 and the light emitting diode group (hereinafter referred to as a light emitting rotating unit) 23 attached to the Stirling engine 18 rotate around the rotating shaft 12. The distance from the center of the rotating shaft 12 to the center of the Stirling engine 18 (center of the displacer 3) is 150 mm.

  A separate electrode 14 is attached to the rotating shaft 12, and current is drawn from the electrode 14 into the engine lower surface plate 2 via the lead 15. In this embodiment, a brush electrode structure is adopted for the electrode structure formed by the electrode 14 and the lead 15. A wiring pattern is formed on the engine lower surface plate 2 so that the light emitting diode 9 can be energized, and the lead 15 and the light emitting diode 9 are electrically connected.

  When a voltage was applied so that a current of 350 mA would flow through each light emitting diode 9, the light emitting rotating unit 23 rotated around the rotating shaft 12 at 60 rpm. At this time, the amount of light emitted from the light emission rotating unit 23 is about 500 lm, which is sufficient for a rotating lamp.

  From the above, it was proved that a rotating lamp that functions only by supplying power to the light emitting unit (light emitting diode 9) can be provided.

Grounds for Optimal Conditions In Embodiment 1, the grounds for setting the current flowing to LXK2-PD12-S00 to 350 mA will be described.

  According to the data sheet of LXK2-PD12-S00, the applied voltage at 350 mA energization is 2.95 V (typical value). The input power at this time is 1032.5 mW. On the other hand, the dominant wavelength is 627 nm, the luminous flux is 60 lm (both typical values), and the radiant flux converted from these is approximately 380 mW. When converted to heat except for the radiant flux, the calorific value per LXK2-PD12-S00 is 652.5 mW. In Example 1, since ten LXK2-PD12-S00 are used, the total calorific value is about 6.5 W.

When a current of 350 mA was passed through each light emitting diode 9, the temperature of the engine bottom plate 2 was measured using a radiation thermometer and found to be approximately 100 ° C. (373 K). Similarly, the temperature of the engine top plate 1 was measured and found to be 20 ° C. (293 K). The efficiency η of the Stirling engine 18 is given as η = 1−T _L / T _{H where} the temperature of the high temperature portion is T _H and the temperature T _L of the low temperature portion, so the efficiency of the Stirling engine 18 of the first embodiment is about 21.4. %. The power of the Stirling engine 18 in the first embodiment is about 1.4 W obtained by multiplying this by the amount of heat generated by the light emitting diode 9.

  On the other hand, when the force required to rotate the light emitting rotating portion 23 without energizing the light emitting diode 9 was measured, it was 1.5N. Since there is a relationship of r × F × ω = W between the power W and the force F, the distance r from the rotation axis to the point where the force is applied, and the angular velocity ω, this is modified so that ω = W / ( r × F) and substituting the power W = 1.4 W, the distance r = 0.15 m, and the force F = 1.5 N obtained above, the angular velocity ω = 6.22 rad / sec≈2π rad / sec = 60 rpm Estimated.

  Based on the above calculation, in order to obtain 60 rpm in this example, the energization current to LXK2-PD12-S00 was set to 350 mA.

  Based on the above calculation, the radiant flux of Example 1 is estimated to be 600 lm, but the actually measured value was 500 lm as shown in Example 1. This is presumably due to the fact that the reflection by the reflecting mirror 10 is not complete and there is a loss.

  In the above-described embodiment, a red rotating lamp is configured using LXK2-PD12-S00 manufactured by Philips Lumileds Lightning Company as the light emitting diode 9, but a blue rotating lamp may be formed using a blue light emitting diode. Moreover, there is no restriction | limiting in the manufacturer and model of the light emitting diode 9, It can select suitably according to a shape and cost.

  Parameters such as the structure and size of the Stirling engine 18, the number of revolutions, the number of light emitting diodes 9, and the energization current are not limited to the above-described embodiments, and can be changed as necessary.

  Unlike the general rotating lamp, the rotating lamp 21 does not use a motor. The DC motor is apt to generate electromagnetic induction noise due to leakage magnetic flux due to its structure, but the above-described rotating lamp 21 does not generate noise because there is no motor. Taking advantage of this feature, for example, the above-described rotating lamp 21 can be used as a signal lamp of a device for detecting a minute current or a magnetic field.

  In addition, the above-described rotating lamp 21 can be used as a school teaching material for learning about the operating principle of the Stirling engine by taking advantage of the unexpectedness that a rotational motion can be obtained only by energizing the light emitting section.

DESCRIPTION OF SYMBOLS 1 Engine upper surface plate 2 Engine lower surface plate 3 Displacer 4 1st cylinder 5 Power piston 6 Crankshaft 7 Connecting rod 8 Connecting rod 9 Light emitting diode 10 Reflective mirror 11 2nd bevel gear 12 Rotating shaft 13 1st bevel gear 14 Electrode 15 Lead 16 2nd Cylinder 17 Opening 18 Stirling engine 19 Reducer 20 Gearbox 21 Rotating light 22 External combustion engine 23 Light emitting diode group (light emitting rotating part)

Claims (3)

  An external combustion engine and a light emitting diode, which obtain power by heating and cooling the gas in the cylinder from the outside, and the light emitting diode serves as a light source and a heating source of the external combustion engine, and the external combustion A rotating lamp characterized in that the engine is a power source for the rotational movement of the light emitting diode.   The rotating lamp according to claim 1, wherein the light emitting diode is a plurality of two or more.   The rotating lamp according to claim 1 or 2, wherein the light emitting layer of the light emitting diode is made of a compound semiconductor containing at least one of aluminum, gallium, indium, and phosphorus.

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