JP6012534B2 - Light bulb type lighting device - Google Patents

Description

  The present invention relates to a light bulb type lighting device.

  2. Description of the Related Art A light bulb-type lighting device including a light emitter having a semiconductor element such as an LED (Light Emitting Diode) has attracted attention in recent years because it can achieve a longer life and energy saving than an incandescent light bulb. In a bulb-type lighting device using an LED, a structure with high heat dissipation is desired for high brightness and high reliability.

  Furthermore, in light bulb-type lighting devices using LEDs, compared to incandescent light bulbs, there is a problem of reduced reliability due to an increase in mass and a complicated structure, and with the rapid spread, high safety is expected. It is rare.

  For example, Patent Document 1 includes a light emitting unit, a holder on which the light emitting unit is mounted, and a glove that covers the light emitting unit, and a groove that surrounds the light emitting unit is formed in the holder. And a fastener for fixing the light emitting part to the holder is attached so as to cover a part of the opening of the groove part, and a through hole is provided in a part of the bottom surface of the groove part. A light bulb-type lighting device is described which aims to prevent the glove from falling off by filling with an adhesive.

JP 2011-54578 A

  In the light bulb-type lighting device described in Patent Document 1, the globe is fixed to the holder with an adhesive. Depending on the deterioration of the adhesive, the glove may fall off.

  An object of the present invention is to provide a highly safe light bulb-type lighting device.

  In order to solve the above problems, the present invention provides a light emitter having one or a plurality of semiconductor elements, a cover member covering the light emitter, a heat radiator that releases heat generated in the light emitter, and the semiconductor. A power circuit board that emits light from the element, a cylindrical shape that communicates from one end surface to the other end surface, and a storage case that stores the power circuit board from the one end surface; a base that is attached to one end side of the storage case; The radiator has an opposed thick part, the light emitter is substantially rectangular, and the radiator is disposed on the radiator so that the longitudinal direction of the light emitter is in the direction of the opposed thick part. The light emitter is fixed to the heat radiator by a holder, the holder is fixed to the heat radiator by a screw, the cover member is held by the holder, and the holder that holds the cover member is locked. Main has a through hole of the screw in the holder, it is arranged on a line connecting the center of the holder.

  According to the present invention, a highly safe light bulb-type lighting device can be provided.

It is an external appearance front view of a light bulb type illuminating device. It is a disassembled perspective view of the lightbulb-type illuminating device shown by FIG. It is a longitudinal cross-sectional view of the lightbulb type illuminating device along the AA line of FIG. It is a longitudinal cross-sectional view of the lightbulb type illuminating device along the BB line of FIG. It is a top view of the lightbulb type illuminating device of the state which removed the cover member. It is a top view of the lightbulb type illuminating device of a state which removed the cover member, the holder, and the light-emitting body. It is an external appearance perspective view of a bulb-type illumination device. It is an external appearance perspective view of a holder.

  Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is an external front view of a light bulb type illumination device. As shown in FIG. 1, the light bulb-type lighting device 100 includes a light emitter 30 (see FIG. 2) having an LED 31 (see FIG. 2) as a semiconductor light emitting element, a cover member 10 that covers the light emitter 30, and the light emitter 30. And a heat dissipating body P that releases the heat generated in the above.

  The radiator P includes a main body portion 70 and a light emitter attachment portion 40 (see FIG. 2). The light emitter mounting portion 40 will be described later.

  The main body 70 includes a hollow and cylindrical body 71 that is reduced in diameter toward the lower side, and a plurality of fins 72 that are integrally formed with the body 71 and are arranged radially about the axis. . Each fin 72 protrudes radially outward from the outer peripheral surface of the body 71 and extends in the axial direction. By providing such a fin 72, the heat dissipation performance of the heat dissipation body P can be improved.

  The fin 72 may have a plurality of extending portions that extend upward by a predetermined length from the upper end of the body portion 71 (the end on the cover member 10 side). That is, the upper portion of the main body 70 may have an uneven shape due to the extended portion of the fin 72 and the upper end of the body portion 71 in a side view. In this case, it is desirable that a plurality of groove portions corresponding to the extending portions of the fins 72 are formed at the bottom of the dome-shaped cover member 10. When the cover member 10 is attached to the main body 70, the extending portions of the fins 72 are fitted into the groove portions of the cover member 10, so that the cover member 10 can be prevented from rotating.

  The bulb-type lighting device 100 includes a base 80. The base 80 will be described later.

  FIG. 2 is an exploded perspective view of the light bulb type lighting device shown in FIG. As shown in FIG. 2, the light emitter 30 and the like are interposed between the cover member 10 and the main body 70. The light emitter 30 includes an LED 31 (semiconductor element) and a substrate 32. The light emitter 30 is substantially rectangular.

  As a light emitting element used for LED31, what emits blue light is used, for example. Each LED 31 is covered with a transparent sealing resin such as a silicone resin. In this sealing resin, a phosphor for color-converting light emitted from the LED 31 is mixed. As the phosphor, for example, one emitting yellow light is used, and the blue light from the LED 31 is color-converted by the phosphor and becomes white light. The LED 31 may be covered with a hemispherical lens in order to improve the light extraction efficiency.

  The substrate 32 has a substantially rectangular shape in plan view, and is provided with four notches 33. A predetermined pattern connected to the LED 31 is formed on the surface of the substrate 32.

  The cover member 10 is made of a resin such as PC (polycarbonate) or glass, and opens toward the light emitting body 30. Incidentally, the cover member 10 may contain a light diffusing material that diffuses light from the light emitter 30. In the vicinity of the opening end 11 of the cover member 10, a hole 13 corresponding to a locking claw of the holder 20 described later is formed.

  The holder 20 fixes the light emitter 30 from above, and thermally contacts the light emitter attachment portion 40 to which the light emitter 30 is attached and the radiator P. Further, in this embodiment, the holder 20 has an annular structure that is a frame having a substantially circular outer shape. When the holder 20 is attached to the light emitter 30, the holder 20 comes into contact with the upper surface edge of the light emitter 30, and the LED 31 is attached. It surrounds. In addition, the holder 20 should just contact | abut to the upper surface edge part of the light-emitting body 30, and surround LED31, when it is attached to the light-emitting body 30, and is not restricted to an annular structure.

  In addition, the holder 20 is provided with a through hole 21 for allowing the screw member S to pass therethrough and a guide portion 23 for guiding a lead wire (not shown). Details of the holder 20 will be described later.

  The light emitter mounting portion 40 is provided with three notches. The positions of the three cutouts correspond to the three screw holes 74 provided in the main body portion 70 of the radiator P. The light emitter mounting portion 40 is formed with a notch 43 for guiding the lead wire.

  Further, the light emitter mounting portion 40 includes, for example, a light emitter mounting portion 1 layer 40a (not shown) formed of a material having high thermal conductivity such as copper, silver, or aluminum (including an alloy), a silicone resin, Light emitter mounting portion two-layer 40b (not shown) formed of a material having good thermal conductivity and high electrical insulation, such as an epoxy resin or a polyimide resin (including those containing an insulating filler such as alumina) ), And.

  The power supply circuit board 50 is obtained by mounting a plurality of electronic components (not shown) on the board. The power circuit board 50 is provided with a capacitor 51 at the lower end. The power supply circuit board 50 includes a circuit that rectifies AC power from a commercial power source into DC power, a circuit that adjusts the voltage of the DC power after rectification, and the like.

  The storage case 60 is made of a resin such as PBT (polybutylene terephthalate) or PC (polycarbonate). The storage case 60 has a cylindrical shape that communicates from one end surface to the other end surface. The power circuit board 50 is stored from one end surface side of the storage case 60. The storage case 60 has a substantially elliptical cross section. On the inner wall of the storage case 60, a holding portion 65 for holding the power circuit board 50 is formed (see FIG. 3). The holding portion 65 is provided at a location facing the inner periphery of the storage case 60. The holding portion 65 is provided in the storage case 60 and may have a groove-like structure or a protrusion-like structure as long as the shape and structure can hold the power circuit board 55. The holding portion 65 may be provided from the upper side to the lower side in the storage case 60 or may be provided only in a part. In the case where the holding portion 65 is provided above the storage case, in addition to the effect of holding the power circuit board 55, there is an effect that it can be easily inserted when stored in the storage case 60. In the case where the holding portion 65 is provided from the upper side to the lower side in the storage case, the holding case 65 can be held stronger than in the case where the holding portion 65 is provided only in a part.

  The storage case 60 includes a reduced diameter portion that conforms to the reduced diameter shape of the inner surface of the main body 70 and a thin portion that is formed continuously from the reduced diameter portion. Due to this and the shape of the power supply circuit board, there is an effect that when the power supply circuit board 50 is inserted into the storage case 60 from above, the power supply circuit board 50 does not fall out from below. The cross-sectional area of the narrow portion is substantially the same as the minimum cross-sectional area of the reduced diameter portion, and a screw groove 61 corresponding to the inner peripheral surface of the base 80 is formed on the outer peripheral surface below the thin portion of the storage case 60. Yes.

  As described above, the main body 70 includes the cylindrical body 71 and the plurality of fins 72 that are integrally formed with the body 71 and are arranged radially about the axis (see FIG. 2). Yes. Further, the inner surface of the body portion 71 has a shape that allows the storage case 60 to be externally fitted, and has a diameter that decreases toward the lower side. The inner surface of the main body 70 is reduced in diameter from the upper side to the lower side.

  In addition, the main body portion 70 includes a convex portion 77 and a convex portion 78 that protrude inward at a plurality of locations (two locations in FIG. 2) on the inner side surface and extend in the axial direction. And the screw hole 74 mentioned above is provided in the upper surface of each convex part 77,78.

  The convex portion 77 and the convex portion 78 are thick portions. The convex portion 77 and the convex portion 78 face each other on the inner surface of the main body portion 70. The convex portion 77 and the convex portion 78 are provided at positions facing the center axis of the bulb-type lighting device 100 (the axis connecting the base and the top of the cover member) as the center. As described above, the inner side surface of the main body portion 70 is reduced in diameter as it goes downward, and the thicknesses of the convex portions 77 and the convex portions 78 are also reduced as it goes downward. That is, in each of the convex portion 77 and the convex portion 78, the thickest portion is the cover side portion, and the thinnest portion is the base side portion. The body portion 71 of the main body portion 70 has a hollow cylindrical shape and can hold the power circuit board 50 inside. In the present embodiment, the opening area above the trunk portion 71 is larger than the opening area below the trunk portion 71. Due to this and the shape of the storage case 60, there is an effect that when the storage case 60 is inserted from above the trunk portion 71, it does not fall out from below the trunk portion 71.

  The light emitter attachment portion 40 is attached to the upper surfaces of the protrusions 77 and 78. Since the convex portion 77 and the convex portion 78 are thick, when the light emitter attachment portion 40 is attached to the main body portion 70, the contact area between the light emitter attachment portion 40 and the convex portions 77 and 78 is the convex portions 77 and 78. It becomes larger than the contact area of what is not provided. By increasing the contact area, heat transfer from the light emitter 30 as a heat source to the main body 70 as a heat radiator is increased. Thereby, the heat dissipation of an LED bulb becomes high and a highly efficient LED bulb can be realized.

  As described above, the light emitter 30 has a substantially rectangular shape. The light emitter mounting portion 40 on which the light emitter 30 is placed is disposed in the direction of the thick portion where the longitudinal direction of the light emitter 30 faces the main body portion 70. That is, the light emitter 30 is arranged so that the longitudinal direction thereof faces the convex portions 77 and 78. Accordingly, it is possible to shorten the distance of heat transfer from the light emitter 30 as a heat source to the convex portions 77 and 78 as thick portions, and to provide a light bulb type lighting device having a structure with high heat dissipation. There is an effect that can be.

  The circumferential lengths of the convex portion 77 and the convex portion 78 that are thick portions are L1 and L2, respectively, and the entire circumference of the main body portion 70 is L. When the bulb-type lighting device 100 is provided in an instrument whose central axis is inclined with respect to the floor surface, the sum of the circumferential lengths of the convex portion 77 and the convex portion 78 that are the thick portions of the main body portion 70. It is desirable that the thick portion is provided so that the length is at least half of the entire length of the main body 70. That is, it is desirable to provide the thick portion so that (the sum of the circumferential lengths of the thick portion) / overall circumference> 0.5. By providing the thick part in this way, it is possible to make sure that a part of the thick part faces the floor surface, and it is possible to increase the heat radiation in the floor surface direction.

  In addition, there is an effect that the storage case 60 does not come off from the upper direction of the main body 70 due to the locking of the light emitter mounting portion 40 and the main body 70.

  Further, a concave portion 75 is formed between the convex portion 77 and the convex portion 78.

  Here, the thickness of the convex portions 77 and 78 is defined to be three times or more the thickness of the concave portion 75.

  The main body 70 is made of a material having high thermal conductivity such as aluminum (including an alloy). Therefore, the heat generated in the light emitter 30 is efficiently conducted to the main body portion 70 via the light emitter attachment portion 40 and is released from the outer peripheral surface of the main body portion 70 to the outside air.

  The base 80 is attached to the lower end side of the storage case 60 and is electrically connected to a commercial power source by being screwed into a socket (not shown) for a general lighting bulb installed outside.

  Next, the holder 20 will be described in detail.

  In the present embodiment, the holder 20 has an annular structure, and a plurality of counterbore holes 22 (three in FIG. 2) corresponding to the shape of the screw member S are provided on the upper portion thereof. In addition, a through hole through which the screw member S passes is provided at the center of the bottom surface of each counterbore hole 22. Further, the holder 20 is provided with a guide portion 23 that is recessed inward in the radial direction and guides a lead wire (not shown).

  The holder 20 has heat resistance and electrical insulation properties such as PC (polycarbonate), PBT (polybutylene terephthalate), COP (cycloolefin polymer), cycloolefin copolymer (COC), acrylic resin, silicone resin, or epoxy resin. It is formed from a resin material. The holder 20 may be made of a light-transmitting material such as glass.

  The holder 20 is provided with a locking claw 24 that is locked to the hole 13 of the cover member 10. The locking claw is locked in the hole 13. When the cover member 10 and the holder 20 are locked, the locking claw 24 has an effect of locking the cover member 10 with respect to the holder 20 and an effect of preventing the rotation of the cover member 10 with respect to the holder 20. Furthermore, the locking claw 24 is located at a portion where the straight line passing through the center of the through hole 21 from the center of the holder 20 and the outer peripheral surface of the holder 20 intersect. Since the holder 20 is fixed to the heat radiating body P by the screw member S, the deformation of the locking claw is suppressed so that the locking claw 24 is positioned near the through hole 21 through which the screw member S passes, and the cover member 10 is locked. When it is done, the effect of suppressing the detachment of the cover member 10 is exerted, and strong locking with the cover member becomes possible.

  In addition, the latching claw 24 has a shape in which the upper side is longer than the lower side, and the cover member 10 is easy to enter from above and is difficult to be removed.

  In the bulb-type lighting device 100, the holder 20 is attached so as to be positioned inside the cover member 10. Here, since the locking claw 24 protrudes so as to protrude toward the outside of the holder 20, a force is applied from the outside to the inside of the cover member 10 after locking the hole 13 and the locking claw 24. Even if it adds, there exists an effect that it is difficult to cancel | release the latching of the hole 13 and the latching claw 24. FIG. Furthermore, in this embodiment, the location where the LED 31 is disposed in the radiator P is one step lower than the upper surface of the radiator P. The upper surface of the holder 20 and the upper surface of the radiator P are about the same height. When the hole 13 and the locking claw 24 are attached, the lower end of the cover member 10 is sandwiched between the outer peripheral side of the holder 20 and the inner peripheral side of the radiator P, and it is difficult to release the locking. There is an effect.

  As described above, in the holder 20 that fixes the light emitter 30 with the screw member S, the locking claw 24 that locks the cover member 10 on the line connecting the center of the holder 20 and the through hole of the screw member S in the holder 20. By providing, the possibility that the cover member (globe) 10 will fall off the light bulb-type lighting device 100 is reduced, and the light bulb-type lighting device 100 with high safety can be provided.

  Returning to FIG. 2 again, an outline of an assembling method of the bulb-type lighting device 100 will be described.

  First, the storage case 60 is fitted into the main body 70 from above. When the storage case 60 is fitted into the main body portion 70 from above, the reduced diameter portion of the storage case 60 comes into contact with the inner surface of the main body portion 60, and the slender portion of the storage case 60 protrudes from the lower opening of the main body portion 70. become. Subsequently, the power supply circuit board 50 is inserted into the storage case 60 from above (one end side) with the longitudinal direction being vertical, and is engaged with the holding portion 65 in the storage case 60 to be stored. Note that the tips of output lead wires (not shown) connected in advance to the power supply circuit board 50 are drawn out of the storage case 60 at this time.

  On the other hand, an input lead wire (not shown) connected in advance to the power supply circuit board 50 is connected to a predetermined portion of the base 80. Further, the lower part of the slender portion of the storage case 60 and the base 80 are screwed together. When the storage case 60 is made of insulative resin, and the slender portion of the storage case 60 protrudes from the main body portion 70, and the lower portion of the slender portion and the base 80 are screwed together, the base and the main body portion are connected. Insulating rubber, etc., which was necessary when there is a risk of contact, is no longer necessary. Thereby, there is an effect that the number of parts can be reduced. The thin portion has a length of about 25 mm, and the portion screwed with the base 80 has a length of about 12 mm from the lower end of the storage case 60. If the main body 70 and the base 80 are provided with a distance of 2 mm or more, there is no possibility that the main body 70 and the base 80 come into contact. At this time, the heat transmitted from the main body portion 70 is less likely to be transmitted to the base 80 side, and thus an effect is obtained that the temperature rise of the capacitor 51 accommodated in the vicinity of the base 80 can be suppressed.

  Subsequently, a resin (not shown) having good thermal conductivity and high electrical insulation may be filled around the power circuit board 50 stored in the storage case 60. With this resin, the heat generated in the power circuit board 50 can be efficiently conducted to the radiator P.

  Next, the light emitter attachment portion 40 on which the light emitter 30 is placed is attached to the main body portion 70.

  Then, the light emitter 30 and the light emitter attachment portion 40 are assembled to the main body portion 70 by passing the screw member S through the through hole 21 of the holder 20 and screwing into the screw hole 74 formed in the upper surface 77 of the main body portion 70. In this state, the annular holder 20 surrounds the LED 31.

  Subsequently, a lead wire (not shown) drawn out from the storage case 60 is wound around the guide portion 23 of the holder 20, and the tip of the lead wire is soldered to the LED 31 of the light emitter 30. Connecting.

  Finally, the cover member 10 is attached from above so as to cover the light emitter 30. That is, the cover member 10 is attached so that the locking claw 24 formed on the holder 20 is locked to the hole 13 formed below the cover member 10.

  Note that the method of assembling the bulb-type lighting device 100 is not limited to the above-described method, and can be changed as appropriate.

  3 is a vertical cross-sectional view of the light bulb-type lighting device taken along line AA in FIG. 2, and FIG. 4 is a vertical cross-sectional view of the light bulb-type lighting device taken along line BB in FIG.

  As shown in FIGS. 3 and 4, the lower surface of the light emitter mounting portion 40 on which the light emitter 30 is installed and the upper surface of the main body 70 are in close contact with each other in the assembled state of the bulb-type lighting device 100. In particular, the contact area with the upper surface of the convex part 77 and the convex part 78 is large.

  The heat generated when the LED 31 emits light is transferred in the order of the substrate 32, the light emitter mounting portion 40, and the main body portion 70, and is released to the outside.

  FIG. 5 is a plan view of the bulb-type lighting device 100 with the cover member 10 removed.

  FIG. 6 is a plan view of the light bulb-type lighting device 100 with the cover member 10, the holder 20, and the light emitter 30 removed.

  FIG. 7 is an external perspective view of the light bulb type illumination device 100.

As described above, the light bulb type illumination device according to the present invention has been described with the embodiment. However, the embodiment of the present invention is not limited to these descriptions, and various modifications can be made.

  Moreover, the light from the light emitter 30 is not limited to white, and can be set to a desired color using LEDs or phosphors having different emission colors.

  Moreover, although embodiment demonstrated the case where the light-emitting body 30 was provided with one LED31, the number of LED is not limited to this, Plural may be sufficient.

  In the embodiment, the LED 31 may be covered with a lens.

  Moreover, although the said embodiment demonstrated the case where the light-emitting body 30 was equipped with LED, you may use other semiconductor light-emitting elements, such as EL (Electro-Luminescence), as the light-emitting body 30. FIG.

DESCRIPTION OF SYMBOLS 100 Light bulb type illuminating device 10 Cover member 11 Open end 20 Holder 30 Light emitter 31 LED (semiconductor element)
50 Power supply circuit board 60 Storage case 65 Holding part 80 Base P Heat radiator

Claims (1)

A light emitter having one or a plurality of semiconductor elements, a cover member covering the light emitter, a heat radiating body that releases heat generated by the light emitter, a power supply circuit board that emits light from the semiconductor element, and an end face A cylindrical case communicating to the other end surface, and a storage case for storing the power circuit board from the one end surface; and a base attached to one end side of the storage case,
The heat dissipating body has opposing thick portions,
The light emitter is substantially rectangular, and the light emitter is disposed on the radiator so that the longitudinal direction of the light emitter is in the direction of the opposed thick portions,
The light emitting body is fixed to the heat radiating body by a holder, the holder is fixed to the heat radiating body by screws, the cover member is held by the holder, and a locking claw of the holder that holds the cover member is A light bulb type illumination device, wherein the light bulb type illumination device is disposed on a line connecting a through hole of the screw in the holder and a center of the holder.