JP2016004735A - Led unit and led lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED unit capable of bringing about a heat radiation effect by an optimum ion wind in accordance with a mounting form of an LED.SOLUTION: A discharge electrode 14 and a counter electrode 15 with thermal conductivity are arranged in positions with a discharge space S1 in between. An ion generating part 12, which excites the discharge electrode 14 by a high voltage to generate an ion wind W1 directed toward the counter electrode 15, is provided. In the counter electrode 15, an LED part 13 is formed on a surface 15a on the other side of a back side 15b brought into contact with the discharge space S1.

Description

  The present invention relates to an LED unit and an LED lighting device having a heat dissipation structure.

  In recent years, in place of incandescent bulbs and fluorescent lamps, lighting devices using light emitting diode elements (LEDs) as light sources have come to be used frequently. Such an LED lighting device includes an LED unit in which an LED is mounted and sealed on a substrate, a lamp holder for accommodating the LED unit, and the like.

  When the LED illumination device has a light emission luminance set according to the illumination range or illumination purpose, and becomes a high-luminance type, the LED illumination device may be used in units of several tens of LEDs. For this reason, as a result of a large amount of current flowing through the LED, the amount of heat generated by the entire LED unit also increases in proportion.

  Regarding the heat generation of the LED unit, the heat generation of the LED is suppressed by forming the lamp holder with a material having high heat dissipation or providing a heat sink on the lamp holder (Patent Document 1). Moreover, in order to improve the heat dissipation in the LED unit, there is also one having a configuration for forcibly radiating heat from the outside by a fan.

  As the heat dissipation mechanism, there are a mechanism using a fan and a mechanism generating an ionic wind by a high-voltage electric field.

JP 2008-306084 A

  As the heat dissipation structure in the LED unit, the one using a fan has the highest heat dissipation efficiency. However, since a space for providing the fan is required, the LED lighting device cannot be downsized. In addition, the influence of noise generated when the fan is driven becomes a problem.

  On the other hand, a structure that generates an ion wind requires a pair of electrodes (discharge electrode and counter electrode) for generating a high-voltage electric field. Depending on the arrangement of the pair of electrodes and the distance setting between the electrodes, the LED unit There may be a difference in the heat dissipation effect. Since the ion wind generated here has a smaller air volume than the fan, a sufficient heat radiation effect cannot be obtained unless the arrangement of the pair of electrodes is set accurately. For this reason, when the optimization of heat dissipation efficiency was considered, there existed a problem that the structure and design of an LED unit had to be changed suitably.

  Therefore, an object of the present invention is to provide an LED unit and an LED lighting device that can obtain an optimum heat dissipation effect by ion wind according to the LED mounting form.

  In order to solve the above problems, the LED unit of the present invention is arranged by disposing a discharge electrode and a counter electrode having thermal conductivity at a position separated from the discharge space, and exciting the discharge electrode with a high voltage. An ion generator for generating an ion wind toward the counter electrode is provided, and an LED is mounted on the surface of the counter electrode opposite to the surface in contact with the discharge space.

  Moreover, the LED lighting device of the present invention includes the LED unit according to claim 1 and a lamp holder that accommodates an ion generation part of the LED unit, and the lamp holder faces the discharge electrode of the ion generation part. It is characterized by having an intake hole for taking in outside air.

  According to the LED unit of the present invention, an ion generating part in which a discharge electrode and a counter electrode having thermal conductivity are arranged at a position separated from the discharge space is provided, and the LED is mounted on one surface of the counter electrode. Therefore, the other surface becomes a heat radiating surface that receives the ion wind. Thereby, the surface on which the LED is mounted can be efficiently radiated. Further, by mounting the LED on the counter electrode, the heat dissipation structure becomes compact, and the LED unit can be downsized.

  In addition, when an LED lighting device in which the LED unit having the above configuration is accommodated in a lamp holder is formed, the flow of ion wind from the discharge electrode toward the counter electrode is promoted by providing an intake hole for taking in outside air into the lamp holder. be able to. Further, by providing an exhaust hole in a part of the lamp holder where the counter electrode is disposed, warm air accumulated in the lamp holder can be discharged to the outside.

It is sectional drawing of the LED unit of 1st Embodiment which concerns on this invention. It is a perspective view of the LED unit of 2nd Embodiment. It is a perspective view of the LED unit of 3rd Embodiment. It is sectional drawing of the LED lighting apparatus incorporating the said LED unit.

  FIG. 1 shows a basic configuration of the LED unit 11 according to the first embodiment of the present invention. The LED unit 11 includes an ion generation unit 12 and an LED unit 13 combined with the ion generation unit 12. The ion generation unit 12 includes a discharge space S1, a discharge electrode 14 disposed at a position separating the discharge space S1, a counter electrode 15 having thermal conductivity, a negative voltage, and a counter electrode 15 applied to the discharge electrode 14. And a high-voltage power supply unit 16 that excites the discharge electrode 14 so as to be discharged by applying a positive voltage. The discharge electrode 14 is formed in a needle shape so that the discharge electrode 14 can be concentrated and discharged. The counter electrode 15 is formed of a thermally conductive flat plate member, and is opposed so that the distance between the central portion of the back surface 15b in contact with the discharge space S1 and the tip end portion 14a of the discharge electrode 14 is about several millimeters. Are arranged. The counter electrode 15 has a role as a substrate on which the LED portion 13 is formed, and is formed of a metal material having good thermal conductivity such as copper or aluminum. Further, the surface 15a opposite to the back surface 15b is covered with an insulating film 17 except for a portion where the light emitter 20 is placed, and a wiring electrode for driving the light emitter 20 is formed on the insulating film 17. 18 is patterned.

  The LED unit 13 includes a light emitter 20 mounted on the surface 15 a of the counter electrode 15 and a translucent resin body 21 that seals the light emitter 20. The light-emitting body 20 is composed of a plurality of light-emitting elements (not shown) having a pair of element electrodes composed of an anode and a cathode. The light-emitting body 20 is directly placed on the surface 15 a of the counter electrode 15, and the bonding wire 23 is attached to the light-emitting body 20. And electrically connected to the pair of wiring electrodes 18. The wiring electrode 18 is connected to an LED driving power source (not shown) different from the high-voltage power supply unit 16 and is driven at a constant current so as to have a predetermined luminance.

  In the ion generation unit 12, a high voltage is applied from the high voltage power supply unit 16 between the discharge electrode 14 and the counter electrode 15 in accordance with the light emission driving of the light emitter 20. As a result, a high-voltage electric field is generated in the discharge space S1, and an ion wind W1 from the discharge electrode 14 toward the counter electrode 15 is generated. The ion wind W <b> 1 convects toward the outer peripheral portion while hitting the central portion of the back surface 15 b of the counter electrode 15 corresponding to the portion immediately below the light emitter 20. For this reason, the whole back electrode 15b side of the counter electrode 15 centering on the light-emitting body 20 with the largest calorific value can be efficiently radiated. Further, since the counter electrode 15 is also a substrate for forming the LED unit 13, a compact LED unit 11 integrated with the ion generating unit 12 can be configured.

  FIG. 2 shows an LED unit 31 including an ion generator 32 and an LED unit 33 according to the second embodiment. The ion generator 32 includes a counter electrode 35 having a plurality of heat radiation fins 37, a plurality of discharge electrodes 34 disposed between the heat radiation fins 37, and between the discharge electrode 34 and the counter electrode 35. And a high voltage power supply unit 36 for applying a high voltage. The counter electrode 35 is made of a metal material having good thermal conductivity such as copper or aluminum, and is formed from a flat plate-like placement portion 38 on which the LED portion 33 is placed, and a back surface opposite to the placement portion 38. A plurality of projecting heat radiation fins 37 are integrally formed. The counter electrode 35 has a role as a heat sink for the LED portion 33, and a space between the radiation fins 37 facing the discharge electrodes 34 is a discharge space S2.

  The LED unit 33 corresponds to the LED unit 13 of the LED unit 11, and is an independent LED package formed by mounting a light emitting body 20 composed of a plurality of light emitting elements (not shown) on a metal base substrate 39. It has become.

  In the present embodiment, the distal end portion 34 a of the discharge electrode 34 is disposed between the radiation fins 37 of the counter electrode 35. Then, by applying a negative voltage to each discharge electrode 34 and a positive voltage to the counter electrode 35, each discharge electrode 34 can be evenly excited to a high voltage, and each radiating fin is provided from the tip 34 a of each discharge electrode 34. The ion wind W2 passing through the space 37 can be generated. As a result, the heat conducted from the placement portion 38 on which the LED portion 33 is placed toward each of the radiation fins 37 can be reduced by the ion wind W2, so that the overall heat radiation efficiency is remarkably improved. It becomes possible.

  In the LED unit 31, a plurality of the discharge electrodes 34 are arranged in accordance with the arrangement intervals of the heat radiating fins 37, but the arrangement is not limited to such an arrangement, and the discharge electrodes are arranged in accordance with the number and arrangement intervals of the radiating fins 37. 34 can be appropriately increased or decreased. Further, each discharge electrode 34 is arranged from the lower side of the radiation fin 37, that is, toward the back surface of the mounting portion 38 on which the LED portion 33 is mounted, so that the back surface side of the LED portion 33 is centered. To dissipate heat. Thus, by making the counter electrode 35 have a plurality of heat radiation fins 37, the heat radiation effect by the heat radiation fins 37 can be further promoted by the ion wind W2 generated from the ion generator 32.

  FIG. 3 shows an LED unit 41 including an ion generation unit 42 and an LED unit 43 according to the third embodiment. The ion generating part 42 includes a counter electrode 45 made of a thermally conductive cylindrical member having a hollow part 47 therein, a discharge electrode 44 disposed toward one open end 47a of the hollow part 47, and a discharge electrode. A high voltage power supply unit 46 that excites the discharge electrode 44 so as to be discharged by applying a negative voltage to 44 and a positive voltage to the counter electrode 45 is provided. A discharge space S3 is formed inside the hollow portion 47 and from one open end 47a to the tip end portion 44a of the discharge electrode 44, and an ion wind W3 is generated in the discharge space S3.

  The LED portion 43 includes a cylindrical metal substrate 48 disposed along the outer peripheral surface of the counter electrode 45 made of a cylindrical member, and a light emitting body 40 made of a plurality of light emitting elements mounted on the metal substrate 48. It is comprised with the translucent resin body 49 which seals on this light-emitting body 40. FIG.

  In the present embodiment, since the tip end portion 44a of the discharge electrode 44 is arranged toward one opening end 47a of the counter electrode 45, a ventilation path of the ion wind W3 that leads toward the other opening end 47b is formed. It will be. Thereby, the back surface side of the metal substrate 48 on which the light emitter 40 is placed can be efficiently radiated along the flow of the ion wind W3.

  FIG. 4 shows the structure of an LED lighting device 51 incorporating the LED unit 41 of the third embodiment. The LED lighting device 51 is a device in which the LED unit 41 is accommodated in a light bulb-type lamp holder 52, and is compatible with a light bulb-type lighting device using a conventional incandescent light source as a light source. .

  The lamp holder 52 accommodates the ion generating part 42 of the LED unit 41, and the LED part 43 formed on the counter electrode 45 of the ion generating part 42 is formed by a hood 54 made of translucent glass or resin. Covered. The lamp holder 52 is formed of a resin in a cylindrical shape, and a base member 55 that can be attached to various electric appliances is provided on the bottom side.

  A distal end portion 44a of the discharge electrode 44 is attached to the center portion in the lamp holder 52 toward the hood 54, and a high-voltage power supply portion 46 is accommodated on the lower side thereof. The counter electrode 45 is disposed so as to protrude into the hood 54 from the upper surface of the lamp holder 52 so that the tip end portion 44a of the discharge electrode 44 faces the central axis of the hollow portion 47 (see FIG. 3). Accordingly, the LED unit 43 serving as a light source is located at the center position of the hood 54 and can emit light in all directions.

  In accordance with the light emission operation of the LED unit 43, an ion wind W3 is generated by applying a high voltage between the discharge electrode 44 and the counter electrode 45, and the inside of the hollow part 47 (see FIG. 3) of the counter electrode 45 is generated. It flows so as to penetrate through the top of the hood part 54. Thereby, the heat generated from the LED unit 43 can be efficiently radiated.

  Further, by providing an intake hole 56 and an exhaust hole 57 in a part of the lamp holder 52 and the hood part 54, the flow of the ion wind W3 passing through the counter electrode 45 is made smooth and the heat from the LED part 43 is obtained. However, heat dissipation efficiency can be improved by preventing the lamp holder 52 and the hood 54 from entering. When the lamp holder 52 is formed of a member with high heat dissipation, the intake hole 56 and the exhaust hole 57 may not be provided.

  In FIG. 4, the generated ion wind W <b> 3 can be concentrated on the counter electrode 45 side by providing the intake hole 56 for taking in outside air in the outer peripheral portion of the lamp holder 52 in the vicinity of the discharge electrode 44. Further, by providing an exhaust hole 57 for exhausting the ionic wind W3 that convects in the hood 54 at the top of the hood 54, the ion wind W3 that has absorbed heat can be directly discharged to the outside, thereby further releasing heat. Efficiency can be increased. Near the top of the hood portion 54, direct light from the LED portion 43 is not directed, so even if the exhaust holes 57 are provided, the overall light emission characteristics are not affected. The intake holes 56 and the exhaust holes 57 are formed into a plurality of minute dots so that they are not conspicuous and can also have dust resistance.

  In the said embodiment, although the LED unit 41 of this invention is combined with the lamp holder 52, the said LED unit 41 can also be combined with a straight tube | pipe type holder like a fluorescent lamp. Further, the LED units 11 and 31 of the first and second embodiments are suitable for the light source of a ceiling-type illumination device.

  As described above, in the LED unit of the present invention, since the LED part is formed integrally with the counter electrode provided in the ion generating part, the heat dissipation structure by the ion wind can be configured easily and compactly. . Moreover, since the flow of the ion wind which goes directly to the said counter electrode can be created, a LED part can be thermally radiated efficiently. As the counter electrode, in addition to the flat plate member and the cylindrical member as shown in the above embodiment, members having various shapes according to the LED mounting form can be adopted. As a result, it is possible to reduce the size of the LED lighting device with higher brightness and increase the degree of freedom in design while ensuring compatibility with the lighting device using a conventional light bulb or LED.

S1, S2, S3 Discharge space W1, W2, W3 Ion wind 11 LED unit 12 Ion generator 13 LED unit 14 Discharge electrode 14a Tip 15 Counter electrode 15a Surface 15b Back 16 High voltage power supply 17 Insulating film 18 Wiring electrode 20 Light emitter DESCRIPTION OF SYMBOLS 21 Resin body 23 Bonding wire 31 LED unit 32 Ion generation part 33 LED part 34 Discharge electrode 35 Counter electrode 36 High voltage power supply part 37 Radiation fin 38 Mounting part 39 Substrate 40 Light emitter 41 LED unit 42 Ion generation part 43 LED part 44 Discharge Electrode 44a Tip 45 Counter electrode 46 High voltage power supply 47 Hollow part 47a, 47b Open end 48 Metal substrate 49 Resin body 51 LED lighting device 52 Lamp holder 54 Hood 55 Base member 56 Intake hole 57 Exhaust hole

Claims (7)

A discharge electrode and a counter electrode having thermal conductivity are arranged at positions separated from the discharge space, and an ion generator that generates ion wind toward the counter electrode by exciting the discharge electrode with a high voltage is provided. ,
The LED unit, wherein the counter electrode is mounted with an LED on a surface opposite to a surface in contact with the discharge space.   The discharge electrode is disposed across the discharge space so that the counter electrode is made of a thermally conductive flat plate member, and the discharge electrode is opposed to a substantially central portion of a surface of the flat plate member that contacts the discharge space. LED unit according to.   The LED unit according to claim 2, wherein the thermally conductive flat plate member is provided with a plurality of heat radiation fins extending toward a discharge space provided between the discharge electrodes.   The counter electrode is made of a thermally conductive cylindrical member, an LED is mounted on the outer peripheral surface of the cylindrical member and a discharge space is provided on the inside, and the discharge electrode is opposed to one opening end of the cylindrical member. The LED unit according to claim 1, wherein the discharge electrode is disposed.   5. The LED unit according to claim 4, wherein the discharge space provided on the inner side of the cylindrical member is formed with an air passage for ion wind that communicates from one opening end to the other opening end. The LED unit according to claim 1, and a lamp holder that accommodates an ion generation part of the LED unit,
The LED lighting device according to claim 1, wherein the lamp holder is provided with an intake hole for taking in outside air toward the discharge electrode of the ion generator.   The LED illumination device according to claim 6, wherein a surface of the counter electrode on which the LED is mounted is covered with a translucent hood, and an exhaust hole is provided in a part of the hood.

Images