JP4962253B2 - LED bulb - Google Patents

Description

  The present invention relates to an LED (light emitting diode) bulb, and more particularly to a structure of an LED bulb having a plurality of LED elements as a light source and having a base for power feeding.

In general incandescent light bulbs and the like, there is no problem even when the input power is changed to heat and the light emitting part is exposed to high heat. On the other hand, as a substitute for a conventional lighting bulb such as an incandescent bulb, an LED bulb capable of keeping power consumption low has begun to be used. Here, since the LED element is a semiconductor element and is destroyed when the junction temperature is exceeded, it is necessary to take measures to dissipate heat generated by the LED bulb. As an example of an LED bulb, Patent Document 1 includes an LED module, a circuit board for driving an LED, a case, a base, a reflecting mirror with a radiating fin, and the like. And a structure in which the two are engaged in a facing state.
JP 2007-48638 A (FIG. 2)

  When designing an LED bulb miniaturized to the same level or less in consideration of the size of conventional incandescent bulbs, krypton bulbs, halogen bulbs, etc., a heat radiating member is disposed in the vicinity of the power supply circuit section. In this case, the power supply circuit unit generates heat by the operation of converting the AC power input to a desired LED drive power supply, but when the heat given from the heat dissipation member is larger, the power supply circuit unit rises in temperature due to heat dissipation from the heat dissipation member. The parts used are adversely affected. In other words, despite the addition of a heat radiating member for extending the life of the LED element, the life of the parts used in the power supply circuit section is shortened, and the life performance of the LED element cannot be sufficiently brought out.

  The present invention has been made to solve the above-described problems, and is intended to reduce the size of a conventional incandescent bulb, krypton bulb, halogen bulb, etc., and to radiate heat generated from the LED light source unit. An object of the present invention is to provide an LED bulb having a structure of a power supply unit in which the heat dissipation member does not adversely affect the power supply circuit unit as much as possible.

  The LED light bulb according to the present invention includes an LED light source unit in which a plurality of LED elements are mounted on an electronic component mounting substrate and can be irradiated on the upper side of the electronic component mounting substrate, and an electronic component mounting substrate of the LED light source unit A power supply circuit unit that is mounted on a circuit board and converts a power supply input to drive power required by the LED light source unit, and at least an outer periphery of the LED light source unit and the power supply circuit unit And a heat radiating member that holds the LED light source part so that heat generated by the LED light source part is conducted, and at least the upper end part is the upper part. A power supply housing case that is inserted and disposed from the lower end opening of the heat radiating member and that houses and holds the power circuit portion below the LED light source portion, and is disposed on the lower end side of the power supply housing case. Previously installed A base that is held by a power supply housing case for inputting power from the outside, a first connection wiring portion that supplies the power from the base to the power supply circuit portion, and the drive power supply from the power supply circuit portion to the LED A second connection wiring portion for supplying to the light source portion, and the outer shape of the portion where the power supply housing case is inserted into the heat dissipation member is different from the shape of the internal space of the heat dissipation member. Features.

  In the LED bulb, the heat dissipation member preferably has a columnar outer shape and has a cylindrical portion at least partially. Thereby, compatibility with a general light bulb having a circular maximum outer shape can be provided, and the surface area of the heat dissipation member can be increased and the weight can be reduced.

  Further, the power supply housing case is preferably held by the heat radiating member in a state where a part of the outer surface of the case is in contact with the inner surface of the cylindrical portion of the heat radiating member. Thereby, a power supply accommodating case can be hold | maintained stably.

  In addition, the power supply housing case includes at least a part of a substantially triangular cylindrical part having a cross section obtained by rounding each corner part of the triangle, and each corner part of the cylindrical part serves as a cylindrical part of the heat dissipation member. It is preferably inscribed. As a result, a required amount of space communicating with the outside can be easily secured between the inner surface of the heat radiating member, and the distance between the power supply housing case and the heat radiating member is increased. Less susceptible to heat.

  Moreover, it is preferable that the heat dissipation member has a plurality of slits formed in the length direction of the cylindrical portion. Thereby, the air convection of the space between a heat radiating member and a power supply accommodating case is enabled, and the influence which a power supply circuit part receives heat from a heat radiating member can further be reduced.

  Further, the power supply circuit portion is preferably arranged in a state where the back side of the circuit board faces along the inner surface of one side wall of the substantially triangular cylindrical portion of the power supply housing case. As a result, the distance between the component mounted on the surface side of the circuit board of the power supply circuit portion and the power supply housing case is increased, and a large space on the circuit board surface side can be ensured to increase the heat dissipation effect.

  In addition, the power circuit portion is arranged in such a manner that the maximum height portion of the component mounted on the surface side of the circuit board faces one corner portion or the vicinity of the substantially triangular cylindrical portion of the power supply housing case. It is preferable that Thereby, the restriction | limiting with respect to the maximum height of the components mounted in the surface side of the circuit board of a power supply circuit part is eased.

  According to the LED bulb of the present invention, the LED light source unit, the power circuit unit, and the base are arranged in the vertical direction, the power supply housing case is arranged on the outer periphery of the power circuit unit, and the heat radiation that can radiate the heat generated by the LED light source unit Since the member is disposed on the outermost side, the size can be reduced to the same size as a conventional krypton bulb, an incandescent bulb, a halogen bulb, or the like.

  In addition, since the power storage case is formed to have an outer shape different from the shape of the internal space of the heat dissipation member, a required amount of space communicating with the outside can be secured between the inner surface of the heat dissipation member, and the power supply case Therefore, the power supply circuit unit is less likely to receive heat from the heat dissipation member, and the power supply circuit unit can be protected.

  Incidentally, an LED light bulb with a total power of about 5 W was prototyped, with the power input to the LED light source unit being about 4 W and the power consumption of the power supply circuit unit being about 1 W. As a result, when the power supply housing case is formed in a substantially triangular cylindrical shape and inscribed in the heat radiating member, compared to the case where the power supply housing case is formed in a cylindrical shape and inscribed in the heat radiating member, It was confirmed that the temperature of the power supply circuit part decreased by about 10 ° C.

  From this, it became possible to reduce the temperature of the parts used in the power circuit part by about 10 ° C., and the life of the parts used in the power circuit part could be extended. As a result, the life performance of the LED (for example, 40,000 hours at 70% brightness) is equivalent to the life performance of the power supply circuit section, and the performance of the entire LED bulb can be improved. Further, instead of extending the life of the LED bulb, it has become possible to raise the use limit ambient temperature of the LED bulb by 10 ° C.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this description, common parts are denoted by common reference numerals throughout the drawings.

<First Embodiment>
FIG. 1 is a perspective view schematically showing a first embodiment of the LED bulb of the present invention. FIG. 2 is a perspective view schematically showing a longitudinal section of the LED bulb of FIG. FIG. 3 is a perspective view schematically showing the components of the LED bulb in an exploded state corresponding to FIG. 4 is a plan view showing the bottom side of the LED bulb of FIG. FIG. 5 is a perspective view showing the LED bulb of FIG. 1 as seen from the bottom.

  The LED light bulb includes, as main components, an LED light source unit 10, a power supply circuit unit 20, a heat radiating member 30, a power supply housing case 40, a base 50, a first connection wiring unit, second connection wiring units 61 and 62, A front cover 70 and the like are provided, and these are assembled. The LED light source unit 10, the power supply circuit unit 20, and the base 50 are arranged in the vertical direction (vertical direction in the figure), the power supply housing case 40 is arranged on the outer periphery of the power supply circuit unit 20, and the LED light source unit 10 generates heat. The heat dissipating member 30 capable of dissipating heat is disposed on the outermost side.

  The LED light source unit 10 has a plurality of LED elements mounted on an electronic component mounting substrate 11 and can emit light emission output on the upper side of the substrate. The power supply circuit unit 20 is disposed below the electronic component mounting substrate 11 of the LED light source unit 10, and a circuit for converting a power input into a driving power source required by the LED light source unit 10 is mounted on the circuit substrate 21. Become.

  The heat radiating member 30 is disposed so as to surround at least the outer periphery of the LED light source unit 10 and the power supply circuit unit 20, has a lower end opened, and the LED light source unit 10 can conduct heat generated by the LED light source unit 10. Holding. In this example, the heat radiating member 30 has a cylindrical outer shape and has a cylindrical portion 31 at least partially.

  Further, the heat dissipating member 30 is disposed on the outermost side of the LED bulb in order to maintain good heat dissipation characteristics. In this case, if the maximum outer shape of the LED bulb is configured to be circular corresponding to the maximum outer shape of a general light bulb, there is a problem of directivity regardless of which direction the base 50 of the LED bulb is twisted. The advantage that it is difficult to get out is obtained. Therefore, it is preferable that the heat dissipation member 30 disposed on the outermost side of the LED bulb has a cylindrical outer shape. Moreover, since it is advantageous that the heat radiating member 30 has a large surface area, and it is preferable to reduce the weight and manufacture at a low cost, at least a part of the cylindrical part is hollowed out (cylindrical part in this example). 31 and the lower end is opened.

  The power supply housing case 40 is disposed with at least an upper end inserted therein from a lower end opening of the heat radiating member 30, and houses and holds the power supply circuit unit 20 on the lower side of the LED light source unit 10. In this case, the outer shape of the portion where the power supply housing case 40 is inserted into the heat radiating member 30 is different from the shape of the internal space of the cylindrical portion 31 of the heat radiating member 20, and a part of the outer surface of the case is a cylinder of the heat radiating member 30. It is preferable that the heat radiating member 30 is held in contact with the inner surface of the portion 31.

  As a specific example of the outer shape of the power supply housing case 40, at least a part of a substantially triangular cylindrical part having a cross section rounded at each corner of the triangle is provided, and a part of the outer surface of the case (triangular cylindrical part) Are preferably held by the heat radiating member 30 in a state in which each corner portion is inscribed in the cylindrical portion 31 of the heat radiating member 30.

  A base 50 for inputting power from outside is disposed on the lower end side of the power supply housing case 40 and is held by the power supply housing case 40. The first connection wiring unit supplies power from the base 50 to the power supply circuit unit 20, and the second connection wiring unit supplies drive power from the power supply circuit unit 20 to the LED light source unit 10.

  Hereinafter, each component will be described.

  (LED light source part 10) As for the LED light source part 10, the some LED element 1 is mounted on the mounting substrate 11 for electronic components, for example, it connected in series and parallel. Then, light emission is driven by the driving power source, and the electronic component mounting board 11 is mounted so that the output light can be irradiated to the upper side (front side of the LED bulb). As the electronic component mounting substrate 11, a glass epoxy substrate, an aluminum core substrate, or the like is used.

  (Power supply circuit part 20) The power supply circuit part is arrange | positioned by the back surface side (lower side in the figure) of the mounting substrate 11 for electronic components of the LED light source part 10, and supplies the power supplied from the nozzle | cap | die 50 side to an LED light source. A circuit for converting to a desired driving power source required by the unit 10 is mounted on the circuit board 21. As the circuit board 21, a glass epoxy board or the like is used.

  (Heat Dissipation Member 30) At least a part of the heat dissipation member is a cylindrical part (cylindrical part in this example) 31, and the cylindrical part 31 is disposed so as to surround the outer periphery of the LED light source part 10 and the power supply circuit part 20. The LED light source unit 10 is held so that the heat generated by the LED light source unit 10 is conducted. The heat radiating member 30 is made of a metal having good thermal conductivity such as aluminum.

  A horizontal partition wall 32 for mounting the LED light source unit 10 in a horizontal state is formed integrally with the cylindrical portion 31 inside the vicinity of the upper end of the heat dissipation member 30. Here, when using a low-priced material with slightly low heat dissipation as the electronic component mounting substrate 11 of the LED light source unit 10, the heat conduction between the electronic component mounting substrate 11 and the horizontal partition wall portion 32 should be improved. Is preferred. For this purpose, the electronic component mounting substrate 11 and the horizontal partition wall 32 may be fixed with a double-sided adhesive tape (not shown) having good thermal conductivity. Along with this, it is not necessary to use a tool such as a screwdriver when attaching the LED light source unit 10, and it is possible to prevent damage caused by the contact of the tool with the LED light source unit 10, thereby facilitating the work and improving the work efficiency. It becomes possible to plan.

  In addition, the heat dissipation member 30 preferably forms a plurality of slits 33 in the length direction of the cylindrical portion 31. Thereby, air convection with the external space is enabled in the space 35 existing between the heat dissipation member 30 and the power supply housing case 40, and the influence of the power supply circuit unit 20 receiving heat from the heat dissipation member 30 can be further reduced. .

  Note that by forming rib-like fins on the outer surface of the cylindrical portion of the heat dissipation member 30, it is possible to improve the heat dissipation effect.

  (Power Supply Case 40) The power supply case has a structure in which at least an upper end portion thereof is disposed in a state where the upper end portion is inserted into the inside from the lower end opening of the heat radiating member 30 and can be mechanically easily coupled to the heat radiating member 30. Have. The power storage case 40 has a structure for storing and holding the power circuit unit 20 on the lower side of the LED light source unit 10, and the user of the LED light bulb touches the power circuit unit 20 carelessly. It has a structure that prevents electric shock accidents.

  In the present embodiment, the power supply housing case 40 is formed to have an outer shape different from the shape of the internal space of the heat dissipation member 30. Thereby, in the part where the power supply housing case 40 is inserted inside the heat radiating member 30, a required amount of space 35 communicating with the outside is secured between them, and the power supply circuit portion is provided by the presence of the power supply housing case 40. 20 is protected from heat from the heat dissipating member 30.

  The power supply housing case 40 has an internal structure that houses and holds the power supply circuit unit 20 in a vertical state. As described above, the maximum height portion of the component 22 mounted on the surface side of the circuit board 21 of the power supply circuit unit 20 held in the vertical state is the substantially triangular cylindrical portion of the power supply housing case 40. It is preferable to face one corner portion or the vicinity thereof. Thereby, the restriction | limiting with respect to the maximum height of the said component 22 is eased.

  (Base 50) The base is for inputting power (usually commercial AC power) from the outside to the inside of the LED bulb, and is disposed on one end side (the lower end side in the figure) of the power supply housing case 40. And is held by the power supply housing case 40. In this case, a base specified in JIS standard E17, E26, etc. is used.

  (First Connection Wiring Unit) The first connection wiring unit supplies power from the base 50 to the LED light source unit 10, and for example, an insulation coating wiring is used.

  (Second Connection Wiring Section) The second connection wiring section supplies a desired power source from the power supply circuit section 20 to the LED light source section 10, and is disposed, for example, through the horizontal partition wall section 32 of the heat dissipation member 30. The lead pin 61 is provided, and a connector portion 62 and the like are provided for electrically connecting the lead pin 61 to the LED light source portion 10.

  (Front cover 70, ring-shaped attachment member 71) The front cover 70 is made of a translucent member and is disposed so as to face the irradiation direction side of the LED light source unit 10. The front cover 70 is attached to the heat dissipation member 30 via a ring-shaped attachment member 71 so as to close the front end opening of the heat dissipation member 30. The front cover 70 may be processed into a shape having a lens effect, and the ring-shaped attachment member 71 is preferably subjected to surface processing so that the inner surface functions as a reflector.

<Second Embodiment>
In the first embodiment, the outer shape of the power supply housing case 40 can be variously modified. Of the three side walls of the power supply housing case 40, at least one of the side walls may be gently curved inward, or at least one may be modified so as to be gently curved outward.

  For example, when the power supply circuit unit 20 can be reduced in size, the cross section of the power supply housing case 40 may be shaped based on a smaller triangle so as not to be inscribed in the cylindrical portion 31 of the heat radiating member 30. Thereby, the influence of the heat which the power supply circuit unit 20 receives from the heat radiating member 30 can be further reduced.

  On the contrary, when the power supply circuit unit 20 is large, the outer shape of the power supply housing case 40 can be a polygonal shape such as a quadrangular prism or a pentagonal prism instead of a triangular prism. However, since the outer shape of the power supply housing case 40 approaches the cylindrical member with such diversification, the distance between the power supply circuit unit 20 and the heat dissipation member 30 is shortened, and the power supply circuit unit 20 is heated from the heat dissipation member 30. It becomes easy to be affected by.

  In the LED light bulb described above with reference to FIGS. 1 to 5, the LED light source unit 10 uses 40 LED elements 1 mounted on a glass epoxy substrate 11, and four sets of 10 LED units connected in series are used. Connected in parallel. In the power supply circuit unit 20, a power supply circuit that generates drive power for driving the LED light source unit 10 in a pulse form from commercial AC power supplied from the base 50 side is mounted on the glass epoxy substrate 21.

  The heat dissipating member 30 is made of a metal having good thermal conductivity such as aluminum, and has a cylindrical portion 31 disposed on the outermost side of the LED light bulb so as to surround the outer periphery of the LED light source unit 10 and the power supply circuit unit 20. A horizontal partition wall 32 for mounting the LED light source unit 10 in a horizontal state is formed integrally with the cylindrical portion 31 inside the vicinity of the upper end of the heat dissipation member 30. Then, in order to improve the heat conduction between the electronic component mounting substrate 11 and the horizontal partition wall portion 32 of the LED light source unit 10, the electronic component mounting substrate 11 and the horizontal partition wall portion 32 are bonded with a double-sided adhesive tape (not shown). It is stuck. The heat dissipation member 30 has a plurality of slits 33 formed in the length direction of the cylindrical portion 31.

  The power supply housing case 40 includes a substantially triangular cylindrical portion 41 having a cross section obtained by rounding each corner portion of the triangle, and a part of the outer surface of the case (each corner portion of the triangular cylindrical portion) and the outer surface of the case. The provided protrusion 42 is held by the heat radiating member 30 in a state where it is inscribed in the cylindrical portion 31 of the heat radiating member 30. The power supply housing case 40 is provided with a guide groove 43 inside the case, and the power circuit portion 20 is housed and held in a state where the outer edge portion of the circuit board 21 of the power circuit portion 20 is fitted in the guide groove 43. is doing. The power supply housing case 40 is made of an insulator, and is disposed in a state where the upper end portion is inserted into the inside from the lower end opening of the heat dissipation member 30, and the power supply circuit portion 20 below the LED light source portion 10. Contain and hold. In this case, a locking claw 44 is provided in the vicinity of the upper end portion of the tubular portion 41, and a holder 45 capable of engaging the locking claw 44 is disposed inside the heat radiating member 30. The power supply housing case 40 is held by the engagement between the claw 44 and the holder 45.

  The base 50 for inputting commercial AC power from the outside of the LED bulb is a base defined by E26 of the JIS standard, and is attached to the lower end side of the power supply housing case 40.

  As the first connection wiring part for supplying power from the base 50 to the LED light source part 10, an insulation coating wiring (not shown) is used. The second connection wiring part for supplying desired power from the power supply circuit part 20 to the LED light source part 10 penetrates the horizontal partition wall part 32 of the heat dissipation member 30 and is electrically connected to the LED light source part 10. It comprises a lead pin 61 disposed and a connector portion 62 disposed in the power supply circuit unit 20 to hold the lead pin 61.

  The front cover 70 disposed so as to face the irradiation direction side of the LED light source unit 10 uses a light-transmitting polycarbonate, and is attached in a ring shape fitted to the upper end opening of the heat dissipation member 30. The front end opening of the heat dissipation member 30 is closed by being fitted to the member 71. In this case, a tongue piece 80a is formed on a part of the outer peripheral edge of the front cover 70, and a notch 81a that engages with the tongue piece tongue 80a is formed on a part of the outer peripheral edge of the ring-shaped attachment member 71. As a result, the front cover 70 can be prevented from rotating. The front cover 70 is processed into a shape having a lens effect, and the ring-shaped attachment member 71 is subjected to surface processing so that the inner surface functions as a reflector.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  The present invention can be used as a substitute for lighting bulbs such as incandescent bulbs, krypton bulbs, and halogen bulbs.

1 is a perspective view schematically showing a first embodiment of an LED bulb of the present invention. The perspective view which shows schematically the longitudinal cross-section of the LED bulb of FIG. The perspective view which decomposes | disassembles from the assembly state, and shows schematically the component of an LED bulb corresponding to FIG. The top view which shows the bottom face side of the LED bulb of FIG. The perspective view seen from the bottom face of the LED bulb of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... LED light source part, 11 ... Electronic component mounting board, 20 ... Power supply circuit part, 21 ... Circuit board, 22 ... Circuit component, 30 ... Heat radiation member, 31 ... Cylindrical part, 32 ... Horizontal partition part, 33 ... Slit, 35 ... space, 40 ... power supply housing case, 41 ... cylindrical portion, 42 ... projection, 43 ... guide groove, 50 ... base, 61 ... connection lead pin, 62 ... connector portion, 70 ... front cover, 71 ... ring-shaped mounting member .

Claims (6)

A plurality of LED elements mounted on an electronic component mounting substrate, and an LED light source unit capable of irradiating the upper side of the electronic component mounting substrate;
A power supply circuit unit that is disposed on a lower side of the electronic component mounting substrate of the LED light source unit, and a circuit that converts a power input into a driving power source required by the LED light source unit is mounted on the circuit board;
The LED light source unit is disposed so as to surround at least the outer periphery of the LED light source unit and the power supply circuit unit, and has a cylindrical part with an open lower end, so that the heat generated by the LED light source unit is conducted. A heat dissipation member that holds
A power supply housing case in which at least an upper end portion is inserted and disposed from a lower end opening of the heat radiating member, and the power supply circuit portion is housed and held on the lower side of the LED light source portion;
A base disposed on the lower end side of the power supply housing case, held by the power supply housing case, for inputting power from outside;
A first connection wiring portion for supplying the power from the base to the power supply circuit portion;
A second connection wiring section for supplying the driving power from the power supply circuit section to the LED light source section;
The LED light bulb is characterized in that an outer shape of a portion where the power supply housing case is inserted into the heat radiating member is different from a shape of an internal space of the heat radiating member.   The heat dissipating member has a columnar outer shape and has a cylindrical portion at least in part, and the power supply case has the heat dissipating member in a state where a part of the outer surface of the case is in contact with the inner surface of the cylindrical portion of the heat dissipating member. The LED bulb according to claim 1, wherein the LED bulb is held by   The power supply housing case includes at least a portion of a substantially triangular cylindrical portion having a cross section obtained by rounding each corner portion of the triangle, and each corner portion of the cylindrical portion serves as a cylindrical portion of the heat dissipation member. The LED bulb according to claim 2, wherein the LED bulb is inscribed.   The LED light bulb according to claim 2 or 3, wherein the heat dissipation member has a plurality of slits formed in a length direction of the cylindrical portion.   4. The power supply circuit portion according to claim 3, wherein the power supply circuit portion is arranged in a vertical state in which the back surface side of the circuit board faces along the inner surface of one side wall of the substantially triangular cylindrical portion of the power supply housing case. 4. The LED bulb according to 4.   The power supply circuit portion is arranged in such a manner that the maximum height portion of the component mounted on the surface side of the circuit board faces one corner portion of the substantially triangular cylindrical portion of the power supply housing case or the vicinity thereof. 6. The LED bulb according to claim 5, wherein the LED bulb is provided.

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