JP2011124209A - Led light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED light source device which gets less temperature rise and is excellent in a color rendering property and is fitted for a power supply connection fixture in an ordinary use such as a screwed type socket. <P>SOLUTION: In the LED light source device, an LED light source section 1 and a power supply control section 4 are connected with a bendable connection member 5. The light source section 1 and the power supply control section 4 are separated from each other via the connection member 5 and a space surrounding the connection member 5 and opened to the outside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to an LED light source device that is small in temperature rise, excellent in color rendering, and highly practical in terms of compatibility with ordinary power connection devices such as screw-in sockets.

  In recent years, light emitting diodes (hereinafter referred to as LEDs) have been used for general lighting for home use and the like, not only in a form corresponding to a fluorescent tube such as a straight tube or a ring, but also in a glove part similar to an incandescent light bulb. A round light source device comprising a screwed connection portion (power receiving portion) has been manufactured.

  4 and 5 show a conventional round LED bulb, and FIG. 5 is a partial cross-sectional view taken along line YY in FIG. The light bulb 90 includes a globe 91, a base 92, an LED substrate 93, a power supply control unit 94 for supplying power to the LED substrate, and a wiring 95. The globe 91 has a lotus-like shape, and the base 92 has a male screw shape that fits into a socket that forms a female screw, similar to a general incandescent bulb, and is connected to an LED substrate from an external power source via a power control unit 94. 93 is an electrical connection means for supplying power to 93. The LED substrate 93 is provided at the top of the globe 91, the base 92 is provided at the bottom of the globe 91, and the power supply control unit 94 is provided inside the globe 91. On the outside of the globe 91, fins 91b for dissipating heat generated from the LED substrate 93 are provided.

  As shown in FIG. 5, the LED substrate 93 includes a substrate 93b and an LED light emitting element 93a fixed on one surface thereof. A circuit component 94b is attached to the other surface of the substrate 93b. The power control unit 94 includes the circuit component 94 b and a circuit component 94 a provided inside the globe 91, and these are connected by a wiring 95. The power control unit 94 converts the power supplied from the external power source through the base 92 into a necessary form and supplies the converted power to the LED light emitting element 93a.

  Such a LED light source device has become popular in recent years because it is small, is compatible with conventional connection devices such as screw-in sockets, and is convenient for mounting and replacement, unlike a fluorescent lamp comprising a straight tube or an annular discharge tube. It's getting on. Such LED lamps are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2009-123461, -13526, 163955, -170114, and 176925.

  In addition, since the lamp-type LED light source device uses the light emission of the LED element and the light emission of the phosphor as necessary, it has better color rendering than a fluorescent lamp that largely depends on the light emission of the phosphor. Easy to get.

  LED light source devices have the advantage of lower power consumption than incandescent lamps. However, since the temperature rises due to heat from the LED elements, fins and the like are provided outside for heat dissipation to prevent temperature rise as much as possible. .

  JP 2009-123641 JP 2009-135026 JP 2009-163955 JP 2009-170114 JP 2009-176925

Problems to be solved by the invention

  However, in the conventional lamp-type LED light source device, even if fins are provided on the outside, the heat emitted from the LED elements is not sufficiently dissipated, and if the lighting is continued, the power supply control unit housed in the entire bulb, particularly inside the globe Temperature rises. As a result, not only the LED element but also the power supply controller is affected by the temperature, and the life of the bulb is shortened.

  Further, in the conventional LED light source device, the LED substrate, that is, the light emitting portion, the base, that is, the power receiving member, and the power supply control portion are integrally formed. Cannot be changed. In order to change the direction of the light, it is necessary to change the direction of the power connection device, and a device having a structure capable of this must be used.

  Further, in the conventional light bulb type LED light source device, the outer part (glove / housing) of the integrally formed light emitting part and power supply control part is made of a metal having good thermal conductivity for the purpose of improving heat dissipation. The weight of the device is large, and it becomes a work burden when mounting or replacing at a high place. In particular, when a large number of light source devices are mounted, they are transported together, so that the overall weight is considerable and the burden on the operator is large. In addition, since it is made of a metal with good heat conductivity, there is a risk of burns due to high temperatures when touching the glove for replacement or removal after a long period of use.

  An object of the present invention is to realize a compact LED light source device that can obtain sufficient illuminance and has a long lifetime.

  Another object of the present invention is to realize an LED light source device capable of freely changing the direction of illumination light even when the power connection tool is fixed, when the power connection tool is attached to a socket or the like.

  Another object of the present invention is to realize a light bulb-type LED light source device that is reduced in weight.

  A further object of the present invention is to realize a light bulb-type LED light source device that is less likely to cause burns even after being used for a long time.

Means for solving the problem

  In order to achieve one of the above objects, a light source device of the present invention includes a light source unit comprising a substrate having at least one LED light emitting element disposed on one surface, a power supply control unit for supplying power to the LED light emitting element, and a power source. An LED light source device comprising a power receiving member for supplying power from an external power source to a control unit, wherein the power receiving member is formed integrally with the power control unit, and includes a connecting member for connecting the light source unit and the power control unit. The power supply control unit is separated from the light source unit through a space and a connection member that surrounds and is open to the outside.

  In order to achieve the above object, a light source device of the present invention comprises a light source unit comprising a substrate having at least one LED light emitting element disposed on one surface, a power supply control unit for supplying power to the LED light emitting element, A power receiving member for supplying power from an external power source and a connecting member for connecting the light source unit and the power source control unit to each other, and a space surrounding the connecting member and open to the outside via the connecting member The power control unit is separated from the light source unit, and the connecting member is flexible and self-holding.

  In order to achieve the above object, the light source device of the present invention is characterized in that the power supply control unit or the light source unit or the outline of both is made of a plastic or post-curing synthetic resin.

  For example, the light source portion may have a cylindrical or polygonal column shape, and the top portion may be used as a light emission surface to accommodate the substrate. The connecting member that connects the light source unit and the power supply control unit is advantageously fixed to the bottom surface of the light source unit, particularly near the center thereof. At least one of the side surface and the bottom surface of the light source unit may be made of a plastic or post-curing synthetic resin. The synthetic resin can be selected from, for example, polyethylene resin, polypropylene resin, polystyrene resin, polycarbonate resin, polyester resin, acrylic resin, epoxy resin, and urea resin (the synthetic resin includes a copolymer). At least one of the side surface and the bottom surface of the light source unit and the outer shell of the power supply control unit may be made of synthetic resin. They may be different synthetic resins.

  The light source unit may be provided with an opening for ventilation leading to the inside in at least one of the side surface and the bottom surface. In particular, when the side surface and the bottom surface of the light source unit are made of synthetic resin, it is preferable to provide an opening for ventilation on at least the bottom surface.

  In the light source device of the present invention, the connecting member that connects the light source unit and the power supply control unit is preferably composed of a material with excellent heat conduction, in particular, in order to efficiently discharge heat generated from the LED light emitting element. preferable. Further, in order to increase the surface area of the outer surface, fins, protrusions, depressions, and the like may be provided. The connecting member is preferably composed of a single member, but may be composed of a plurality of members. It is good also as a structure where either a power supply control part and a light source part or both can rotate with respect to a connection member. If the connecting member is made hollow, electrical wiring for connecting the power supply control unit and the light source unit can be passed through the inside. If the connecting member and the power supply control unit or the light source unit can be detached and reconnected together with the electrical connection, the replacement can be easily performed when one of them fails.

  In the light source device of the present invention, the connecting member that connects the light source unit and the power source control unit is configured to be surrounded by a space that is interposed between the light source unit and the power source control unit and that is open to the outside. A power receiving member having a cylindrical shape is generally used, but it is advantageous in terms of heat dissipation from the surface of the connecting member that the connecting member fits in a cylindrical space having a smaller diameter than the power receiving member. It is.

  By making the connecting member flexible and self-holding in a direction perpendicular to the axis, the connecting member can be bent and the direction of the illumination axis can be freely changed even when the power supply connector is fixed. Constructing the connecting member with a metal having an appropriate shape (for example, a spiral shape) is advantageous for making it flexible.

  In the light source device of the present invention, the power control unit is formed integrally with the power receiving member. You may comprise the outline of a power supply control part with a plastics or post-curing synthetic resin. The synthetic resin can be selected from, for example, a polyethylene resin, a polypropylene resin, a polystyrene resin, a polycarbonate resin, a polyester resin, an acrylic resin, an epoxy resin, and a urea resin (the synthetic resin includes a copolymer).

  The light source unit of the light source device of the present invention is an LED that arranges at least one first LED light emitting element and at least one second LED light emitting element on one surface of the substrate, and emits white light from the first LED light emitting element. The second LED light emitting element may be a LED light emitting element that emits colored light or white light having a color temperature different from that of white light from the first group. Thereby, the color rendering property with respect to various illumination objects can be improved.

  The colored light emitted from the second LED light-emitting element may give a composition rich in color temperature or long wavelength component lower than the color temperature of white light emitted from the first LED light-emitting element, depending on the use of the light source device. Alternatively, it may give a composition rich in higher color temperature or short wavelength components. For example, a light emitting element that emits red light or yellow light can be used, and a light emitting element that emits green light or blue light can also be used. The light source device having a color temperature lower than that of the first light-emitting element is useful for lighting of meat on the display shelf, and the light source device having a color temperature higher than that of the first light-emitting element is useful for lighting of jewelry and green vegetables.

  Fins (fins) may be provided in one or both of the outer surface (for example, the side surface and / or the bottom surface) of the light source unit and / or the power supply control unit to promote heat dissipation. A lens for condensing light may be provided on the light emission surface of the light source unit, or a reflector having an appropriate shape may be provided so as to surround the light emitting element.

The invention's effect

  According to the present invention, it is possible to realize a compact LED light source device having a long lifetime because sufficient illuminance is obtained and a temperature rise when used is suppressed. The light source device of the present invention includes a connecting member that connects the light source unit and the power source control unit, and the light source unit and the power source control unit are connected to each other through the connecting member and a space that is open to the outside. Since they are separated from each other, the heat emitted from the LED light emitting element is easily dissipated from the surface of the connecting member, and most of the heat emitted from the light source part is dissipated outside without reaching the power supply control part. As a result, the temperature rise, particularly that of the power supply control unit, can be suppressed even when turned on for a long time, so that deterioration of the circuit components of the power supply control unit due to high temperatures can be avoided and the life can be extended. Compared to the case where the light source unit and the power source control unit are directly connected (formed integrally), the heat radiation from the light source unit is promoted by the presence of the connecting member, and the temperature rise of the light source unit is also suppressed.

  According to the present invention, since the light source unit and the power source control unit are connected by the flexible and self-holding connection member, the direction of the light source unit with respect to the power source control unit is required by bending the connection member. It can be changed accordingly. That is, the direction of the axis of the light source unit can be freely changed with respect to the power receiving member fixed integrally with the power supply control unit. Therefore, when the power receiving member is attached to a power supply connection tool such as a socket, the main direction of light of the light source device can be freely changed within an allowable range even when the power connection tool is fixed.

  If the outer side of the side surface and the bottom surface of the light source unit (whichever is sufficient) and the outer side of the power supply control unit are made of synthetic resin, the weight can be reduced compared to the case where they are made of metal, and the total weight of the light source device Can be made much lighter.

  By providing an opening for ventilation on at least one of the side surface and bottom surface of the light source unit, heat from the LED substrate housed in the light source unit can be efficiently released to the outside by an air current, and temperature rise is suppressed. Can do. In particular, when the side surface and the bottom surface of the light source unit are formed of a synthetic resin having a lower thermal conductivity than metal, the effect is great.

  If the side of the light source is made of synthetic resin, it will feel extremely hot or even burned even if it is touched by hand for replacement immediately after turning on for a long time, unlike when it is made of metal with good thermal conductivity. There are no advantages.

(First embodiment)
FIG. 1 is an explanatory diagram of a light source device according to a first embodiment of the present invention. The lamp 10 includes a light source unit 1, a base 2, a power supply control unit 4, and a connecting tube 5. An LED substrate 3 is disposed inside the light source unit 1. The basic shapes of the outer shapes of the light source unit 1, the base 2, the power source control unit 4, and the connecting tube 5 are all cylindrical. The base 2 and the power supply control unit 4 are integrally formed, and these and the light source unit 1 are connected by a connecting tube 5. The base 2 has the shape of a male screw that fits into a socket that forms a female screw, like a general incandescent bulb (for example, the base 92 in FIG. 4). On the outer periphery of the light source unit 1, a large number of fins 1 b for dissipating heat generated from the LED substrate are provided. The outer shell of the power control unit 4 is made of polycarbonate resin. The base 2 includes a male screw part 2a and a head part 2b each made of metal, and an insulator 2c interposed therebetween. The connecting pipe 5 is made of stainless steel that can be easily bent, and can be bent up to about 80 degrees in a plane including the shaft.

  FIG. 2 is a partial cross-sectional view taken along line XX in FIG. As for the LED board 3 arrange | positioned inside the light source part 1, the LED light emitting element 3a is being fixed to the surface (table | surface) far from the nozzle | cap | die 2 of the resin substrate 3b. The back side and the outer periphery of the LED substrate 3 are surrounded by a mantle 1a of the light source unit. The jacket 1a has a circular basin shape, the bottom surface 1c is provided with a ventilation hole 1d, and the outside of the side surface is provided with the fin 1b as described above. The jacket 1a is made of a polycarbonate resin including the fins 1b. A wiring 3 c that connects the LED light emitting element 3 a and the power supply control unit 4 is passed from the center of the LED substrate 3 to the inside of the cylindrical connecting tube 5.

(Device operation)
When the base 2 is attached to a charged socket (not shown), electric power necessary for the operation of the LED light emitting element 3a is supplied to the power supply control unit 4 connected to the base 2, and the LED light emitting element 3a is further connected via the wiring 3c. To be supplied. The light from the LED light emitting element 3a is emitted to the front surface of the light source unit 1 (the front side of the LED substrate 3) and used for illumination. When it becomes necessary to change the axial direction of illumination, the connecting tube 5 may be bent to an appropriate angle so that the light source unit 1 is directed in a desired direction.

  Part of the heat generated in the LED substrate 3 is released to the outside through the front surface of the light source unit 1 and the outer jacket 1 a, and part of the heat is transmitted to the connecting tube 5. Part of the heat transferred to the connecting pipe 5 is released to the outside from the surface, and only the remaining heat reaches the power supply control unit 4. Since the heat reaching the power control unit 4 is only a small part of the heat generated in the LED light emitting element 3a, the temperature rise of the power control unit 4 is extremely small.

(Second embodiment)
FIG. 3 shows a partial cross section of the light source device according to the second embodiment of the present invention. The lamp 20 has basically the same structure as that of the first embodiment except that the bottom surface 1c of the light source unit is provided with a ventilation hole 1d. The configuration other than the ventilation hole 1d and the operations and effects related to other than heat transfer are the same as those in the first embodiment, and a description thereof will be omitted.

  Part of the heat generated in the LED substrate 3 is released to the outside through the front surface of the light source unit 1 and the outer jacket 1a, and part of the heat is released from the back surface of the LED substrate 3 through the ventilation hole 1d. Other heat is transmitted from the light source unit 1 to the connecting tube 5. A part of the heat is released to the outside from the surface, and only the remaining heat reaches the power supply control unit 4. Since the heat reaching the power controller 4 is only a small part of the heat generated in the LED light emitting element 3a, the temperature rise of the power controller is extremely small.

(Measurement Example 1)
The outer periphery of the light source unit 1 and the power supply control unit 4 is made of polycarbonate resin, and the connecting tube 5 is made of stainless steel, thereby producing the LED lamp 10 of the first embodiment. When the LED substrate 3 comprising 6 white light emitting LED elements with power consumption of 1.2 watts as the LED light emitting element 3a was measured, the temperature of the surface of the power supply control unit after 30 minutes and 60 minutes of continuous lighting was measured. 30 ° C and 32 ° C. At this time, the temperature of the light source was 48 ° C. and 52 ° C., respectively.

  For comparison, an LED bulb having the conventional structure shown in FIG. 4, that is, an LED bulb provided with a light emitting unit and a power supply control unit adjacent to each other in a globe, was manufactured using the same six LED light emitting elements as described above. About this, when the temperature of the surface of the power supply control part 30 minutes after and 60 minutes after a continuous spot was measured, respectively, they were 38 degreeC and 42 degreeC. At this time, the temperature of the light source unit was 50 ° C. and 57 ° C., respectively.

The above temperature measurement results are summarized in Table 1.

  Side view of the LED light source device of the present invention   Partial sectional view of the LED light source device of the present invention   Partial sectional view of the LED light source device of the present invention   Side view of conventional LED light source device   Partial sectional view of a conventional LED light source device

DESCRIPTION OF SYMBOLS 1 Light source part 1a Mantle 1b Fin 1c Bottom face 1d Ventilation hole 2 Base 2a Male screw part 2b Head 2c Insulator 3 LED board 3a LED light emitting element 3b Substrate 3c Wiring 4 Power supply control part 5 Connecting pipe 10, 20 Lamp 90 Light bulb 91 Globe 91b Fin 92 Base 93 LED board 93a LED light emitting element 93b board 94 Power supply control units 94a, 94b Circuit component 95 Wiring

Claims (8)

A light source unit comprising a substrate having at least one LED light emitting element disposed on one surface, a power supply control unit for supplying power to the LED light emitting element, and a power receiving unit for supplying power to the power supply control unit from an external power source In an LED light source device comprising a member,
The power receiving member is formed integrally with the power control unit,
Comprising a connecting member for connecting the light source unit and the power control unit;
The LED light source device, wherein the power supply control unit is separated from the light source unit through a space that surrounds the connection member and is open to the outside, and the connection member.   The LED light source device according to claim 1, wherein the power receiving member has a cylindrical shape as a whole, and the connecting member is accommodated in the cylindrical space having a diameter smaller than the diameter of the power receiving member. A light source unit composed of a substrate having at least one LED light emitting element disposed on one surface, a power source control unit for supplying power to the LED light emitting element, and formed integrally with the power source control unit, and supplied with power from an external power source A power receiving member, and a connecting member that connects the light source unit and the power source control unit,
The power supply control unit is separated from the light source unit through the space surrounding the connection member and opened to the outside and the connection member.
The LED light source device, wherein the connecting member is flexible and self-holding in shape.   The LED light source device according to claim 1, wherein the power control unit has an outer shell made of a plastic or post-curing synthetic resin.   4. The light source unit according to claim 1, wherein the light source unit has a cylindrical or polygonal column shape, at least a side surface is formed of a plastic or post-curing synthetic resin, a top part is a light emission surface, and the substrate is housed therein. LED light source device.   The LED light source device according to claim 5, wherein a side surface and a bottom surface of the light source unit are formed of the synthetic resin.   The LED light source device according to claim 5 or 6, wherein at least one of the side surface and the bottom surface of the light source unit has an opening for ventilation leading to the inside.   The LED light source device according to claim 5 or 6, wherein an outline of the power control unit is made of a plastic or post-curing synthetic resin.

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