JP5153551B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device using a light emitting diode as a light source.

  2. Description of the Related Art An illumination device using a light emitting diode (LED) as a light source is widely used as an alternative to a fluorescent lamp because it has higher luminance, lower power consumption, and longer life than a fluorescent lamp. The reason why the power consumption is low and the lifetime is long is because the conversion efficiency from electricity to light is very high. The reason for the high brightness is that it is not diffused light like incandescent lamps. However, since the light emitting diode is vulnerable to heat, the heat dissipation performance is deteriorated, and there is a problem that the light emission efficiency is lowered at a high temperature. For this reason, in a lighting device using a light emitting diode as a light source, the light emitting diode is cooled by various methods so as not to deteriorate heat dissipation.

  In a lighting device using a light emitting diode as a light source, there are those disclosed in Patent Documents 1 and 2 as conventional technologies of a lighting device that discloses a method for cooling a light emitting diode. In the fifth to thirteenth lines of paragraph No. [0020] of Patent Document 1, there is a description explaining the configuration of the heat sink, and “in order to improve the heat dissipation characteristics of the light source 100, the elongated heat sink 101 Constructed to provide heat dissipation and cooling by convection, as clearly shown in Figure 2, the tubular heat sink 101 is hollow and has an internal cavity 103 containing one or more heat dissipation fins 105. Although the fins 105 are shown as having a triangular shape, other shapes are possible, and the fins 105 are generally formed within the elongated heat sink 101. In the illustrated embodiment, convective cooling is: Given by the movement of the medium 102 through the elongated heat sink 101. The medium used in the exemplary embodiment is air, but in some applications it is larger. Thermal dissipation and medium to provide cooling are described as possible "in the fluid other than air. The first to fifth lines of paragraph number [0027] of Patent Document 1 describe the flow of the cooling medium passing through the heat sink, and “use convection by the flow of air through the tubular heat sink 101 is used. Cold or unheated air enters from the lower end of the tubular heat sink 101 and exits from the upper end as heated air, with higher wattage light sources allowing other fluids rather than using air as a refrigerant In particular, convection heat pumping is used to remove heat from the inside of the heat sink.

  Patent Document 2 discloses a light irradiation apparatus that can cool a light emitting diode and at the same time prevent a decrease in the amount of light due to the adhesion of foreign matter caused by outgas. The first to seventh lines of paragraph number [0023] of Patent Document 2 describe a configuration for dissipating heat generated from the light emitting diodes. “The heat generated from the light emitting diodes 2 by energization is the LED. It is transmitted to the holder 5 and further transmitted from the LED holder 5 to the lens holder 11 formed of a metal material such as aluminum, and is radiated to the outside of the main body 10. Then, the cooling water is supplied into the main body 10 through the pipe joint 14. Gas is introduced, and the vertical grooves 5d and 5e formed on the peripheral surface of the LED holder 5 and the gap generated between the peripheral surface of the LED holder 5 and the inner peripheral surface of the lens holder 11 serve as a flow path, and cooling gas Reaches the light-emitting portion 1 and the light-emitting diode 2, the LED holder 5, and the lens holder 11 are cooled by the gas, so that heat is radiated through the LED holder 5 and the lens holder 11. Has been described as promoted is ". Further, in the first to seventh lines of paragraph number [0024] of Patent Document 2, there is a description of a means for causing the cooling fluid to flow out toward the light emitting diode. The cooling gas passes through the gap between the first and second lenses 3A and 3B, the second spacer 4B, and the lens holder 11, and flows out from the opening at the tip of the lens holder 11. At this time, the lens holder 11 Gas is allowed to flow out toward the surface of the light emitting unit 1 or the front region thereof by the inner flange 11a provided in the first and second lenses 3A and 3B, the second spacer 4B, and the lens holder. 11 and the inner flange 11a provided in the lens holder 11 serves as an outflow means for allowing the cooling gas to flow out toward the front surface of the light emitting unit 1 or the front region thereof.

JP 2005-527987 A JP 2005-347409 A

  However, in the inventions described in Patent Documents 1 and 2, a cooling fluid (gas) that absorbs heat from the light emitting diode is discharged to the outside of the light source, so that there is a problem that the temperature rises around the light source. there were. In particular, when a light source having an LED is disposed in a closed space, for example, a processing chamber of a machine tool, there is a problem that the temperature in the processing chamber rises due to high-temperature exhaust. When the temperature in the processing chamber rises, there is a concern that the dimensional accuracy of the workpiece decreases.

  An object of this invention is to provide the illuminating device which has high cooling efficiency and can suppress the surrounding temperature rise.

In order to achieve the above object, according to the present invention, in a lighting device using a light emitting diode as a light source, the light emitting diode is provided inside, a body covered with a cover, and power is supplied to the light emitting diode. A protective tube that is connected to the main body and protects the electric wire, and a fluid tube that is passed through the protective tube and supplies a fluid that cools the light emitting diode, and the protective tube. An exhaust passage for the fluid is formed therein, and the main body is partitioned into a plurality of rooms by a partition wall with a closed space having the light emitting diode therein, and the fluid supply path and the fluid exhaust path are separate rooms. lighting device that is formed respectively are provided.

  As described above, according to the lighting device of the present invention, the fluid that has absorbed heat from the light emitting diode of the lighting device is discharged through the exhaust path formed in the protective tube in which the electric wire and the fluid tube are stored. The fluid having a high temperature can be discharged to a place away from the lighting device. Thereby, it can prevent that the circumference | surroundings of an illuminating device rise in temperature.

  Further, since the fluid supply path and the fluid exhaust path are formed in separate rooms partitioned by the partition walls, the low temperature fluid supplied into the closed space and the high temperature fluid exhausted Can be prevented from mixing in the same room, thereby increasing the cooling efficiency.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a lighting device according to the present invention. The illumination device according to the present invention is used as illumination inside a machine tool in place of a conventional fluorescent lamp, and includes a plurality of light emitting diodes 2 fixed on the base 3 and an external power source (see FIG. (Not shown) an electric wire 4 for supplying electric power to the light emitting diode 2, a flexible tube (protective tube) 5 for protecting the electric wire 4, and air that is passed through the flexible tube 5 to cool the light emitting diode 2. And an air tube 6 to be supplied therein, and an air exhaust path is formed between the inner wall of the flexible tube 5 and the outer wall of the electric wire 4 and the air tube 6. This illuminating device 1 has a closed space between the base 3 and the curved glass 7 covering the base 3, and a plurality of light emitting diodes 2 are arranged in the closed space. The closed space is sealed by the side pads 8 and 9 on both sides so that dust, liquid, and the like do not enter from the outside. Also, the base 3 itself has a plurality of rooms partitioned by the partition wall 10.

  The light-emitting diode 2 is a surface-mounted white light-emitting diode having a rated output of 0.57 w. However, the light-emitting diode 2 is not limited to this, and the light-emitting diode having a predetermined output depends on the target brightness, the size of the lighting device, and the number of light-emitting diodes. Can be selected. As an example, the lighting device 1 of the present embodiment has 24 light emitting diodes arranged in a row at a predetermined interval in order to obtain brightness equivalent to 15 W. The light emitting diode 2 has positive and negative lead terminals (not shown). The two-pole lead terminal is electrically fixed to a conductor portion (not shown) on the base 3 by soldering, but is not limited thereto. The lead terminal may be electrically connected to the electric wire 4 between the pair of press contact blades as a press contact terminal having a pair of press contact blades. Moreover, a lead terminal and the conductor part of the base 3 can also be electrically connected by wire bonding.

  For the base 3, an aluminum molding material (heat radiation panel) in which a conductor portion is formed with a predetermined circuit pattern and the periphery of the conductor portion is insulated by an insulating layer can be used, but is not limited thereto. That is, other materials such as hard silicon rubber and ceramics excellent in insulation, moldability, and thermal conductivity can be used as a constituent material. Further, a printed circuit board in which conductor portions are integrally formed can be used. In the present embodiment, since an aluminum molding material is used for the base 3, it is possible to efficiently dissipate heat from the light emitting diode, and as a conductor portion, punching out from a conductive substrate such as copper with a press, A bent bus bar can also be used.

  As shown in FIG. 2, the base 3 has a partition wall 10 so that the closed space of the lighting device 1 is partitioned into a plurality of rooms. In order to integrally form the partition wall 10 on the base 3, it is preferable to extrude the base 3 with an aluminum material. Although the number of the plurality of rooms is not limited, in the present embodiment, four rooms are formed by the partition wall 10. The light emitting diode 2 is fixed in the upper first chamber 12a, and a space between the base 3 and the glass 7 is sealed. A supply path through which cold air supplied by the air tube 6 flows is formed in the lower second chamber 12b. Cold air is supplied from an air introduction hole 15 formed in the side pad 8. Air that is supplied from the side pad 8 side and flows through the second room 12b and absorbs heat from the light emitting diode 2 hits the inner surface of the side pad 9 to the left and right third chambers 12c and 4d. Exhaust passages for discharging the turned air to the outside are formed. The air that has absorbed heat is exhausted from an air outlet hole 16 formed in the side pad 8 having the air introduction hole 15. Exhaust gas led out from the air outlet hole 16 passes through a gap inside the flexible tube 5 and is discharged out of the machine tool. The number of rooms partitioned by the partition wall 10 is not limited to four, and may be three. In the case of three rooms, the third room forms an exhaust path.

  The electric wire 4 that electrically connects the external power source and the base 3 is protected by a flexible tube 5. The electric wire 4 has a connector (not shown) having two-pole contact terminals at the end on the base 3 side. The base 3 has a mating connector (not shown) that is connected to the electric wire 4 by a connector. Electricity flows from the external power source to the base 3 by electrically connecting the electric wire side connector and the base side connector. The tube that protects the electric wire 4 is not limited to the flexible tube 5, but by using the flexible tube 5, the tube can be flexibly adapted to expansion and contraction in the axial direction, lateral displacement, bending displacement, and the like. Thus, handling of the electric wire 4 is facilitated, and it is possible to prevent disconnection due to stress concentration at the connector connecting portion. The flexible tube 5 is fixed to the side pad 8 via the fastening means 13.

  As shown in FIG. 3, an air tube 6 is passed through the flexible tube 5. Further, the gap inside the flexible tube 5 is a gap between the electric wire 4 and an exhaust path through which exhaust gas that has absorbed heat flows. Since the flexible tube 5 is integrally molded with a resin so that the inside of the tube becomes a sealed space, the exhaust that has absorbed heat is discharged outside the machine without leaking out of the tube 5 in the middle. Can do. Moreover, since the cold air and the exhaust which absorbed heat are not mixed in the flexible tube 5, it can prevent that the cooling efficiency of the illuminating device 1 falls.

  As described above, according to the lighting device 1 of the present embodiment, the exhaust that has absorbed heat from the light emitting diode 2 of the lighting device 1 is formed between the inner wall of the flexible tube 5 and the outer wall of the electric wire 4 and the air tube 6. It is discharged out of the machine through the gap. Thereby, it can prevent that the temperature of the processing chamber of a machine tool rises, and can perform highly accurate processing.

  Further, since the air supply path and the air exhaust path are separately formed in the room partitioned by the partition wall 10 in the base 3, the low-temperature air supplied into the closed space of the lighting device 1. And high-temperature exhaust can be prevented from mixing in the same room, and the lighting device 1 can be efficiently cooled.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

It is sectional drawing which shows one Embodiment of the illuminating device which concerns on this invention. It is sectional drawing cut | disconnected along the AA line of FIG. It is sectional drawing cut | disconnected along the BB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light emitting diode 3 Base 4 Electric wire 5 Flexible tube 6 Air tube 10 Partition wall

Claims (1)

In a lighting device using a light emitting diode as a light source,
A main body having the light emitting diode inside and covered with a cover;
An electric wire for supplying power to the light emitting diode;
One end is connected to the main body and protects the electric wire,
A fluid tube that is passed through the protective tube and supplies a fluid that cools the light emitting diode;
Forming an exhaust passage for the fluid in the protective tube ;
The body, the closed space having the light emitting diode therein is partitioned into a plurality of chambers by the partition walls and an exhaust passage of the fluid supply passage of said fluid characterized that you have been respectively formed on another room Lighting device.

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