JP2014116148A - LED lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lamp that can be self-stood under a state in which a heat sink and a circuit storing member are integrally assembled and mechanical load for holding the heat sink is not applied to a connector.SOLUTION: A protruding cylinder 71 of an insulation casing 7 is protruded out of an inside of a heat radiator member 4 through an opening at the central part of a bottom wall 42, a bushing 9 is threadably engaged with a first threaded part 74 and the bottom wall 42 of the heat radiator member 4 is held by an abutment part 72 of the insulation casing 7 and a flange part 93 of the bushing 9. A connector member 10 is threadably engaged with a second threaded part 75. The connector member 10 and the bushing 9 are threadably engaged while being spaced apart from each other.

Description

  The present invention relates to an LED lamp capable of replacing a light bulb using a solid light emitting element such as a light emitting diode.

In recent years, due to an increase in environmental awareness, lighting devices using LED elements excellent in power saving as light sources have been actively used. Particularly recently, LED lamps that can be replaced as they are in a general lighting device using an incandescent light bulb are rapidly spreading.

Japanese Patent No. 4755319

  The LED lamp described in Patent Document 1 is configured such that a bottom wall of a heat sink (case) is sandwiched between a cylindrical body that is a circuit storage member and a base, and is made of an insulating material between the bottom wall of the heat sink and the base. An annular member is interposed.

In the form of Patent Document 1, as an assembling method, first, a heat sink is sandwiched between a cylinder that is a circuit storage member and a base. Since the tip of the base is rounded, it cannot be placed independently at the time of assembly, and the heat sink must be held by some means in the assembly work after the next process. In addition, a mechanical load is applied to the base in order to sandwich the heat sink, and there is a concern about the influence on the joint portion of the power supply line that supplies power to the lighting circuit due to the distortion.

  The present invention has been made in view of the above points, and in the assembly process of the LED lamp, the heat sink and the circuit housing member can be placed independently in a state where they are assembled together. An object of the present invention is to provide an LED lamp that does not apply a mechanical load for sandwiching a heat sink.

According to the first aspect of the present invention, an LED board including an LED board on which an LED element is mounted, a cylindrical insulating casing that houses a lighting circuit board, and a cylindrical heat dissipation member that stores the insulating casing. In the lamp, the lower end portion of the insulating casing protrudes outside from the bottom wall opening of the heat radiating member, and a clamping member is attached to the protruding portion, and the clamping member and the lower end portion of the insulating casing In a state where the bottom wall portion of the heat dissipating member is sandwiched and the heat dissipating member and the insulating housing are fixed, the heat dissipating member can be placed independently with the lower end portion of the insulating housing being the bottom surface.

The invention according to claim 2 is characterized in that a cap member is mounted on the protruding portion from the bottom surface side opening of the heat radiating member in the insulating casing so as to be separated from the clamping member.

  The invention according to claim 3 is characterized in that the clamping member is formed of an insulating material in an annular shape.

In the invention described in claim 4, the clamping member is screwed to the outer periphery of the protruding portion from the bottom surface side opening of the heat radiating member in the insulating casing.

  In the invention according to claim 5, the base member is screwed into the outer periphery of the protruding portion from the bottom surface side opening of the heat radiating member in the insulating casing, being separated from the clamping member. It is what.

  According to the present invention, when assembling the heat sink and the circuit housing member integrally, an annular member different from the base is used, so that the heat sink and the circuit storage member can be placed independently in an integrally assembled state, and the assembly after the next process can be performed. In addition, since the annular member and the base are independent, no mechanical load is applied to sandwich the heat sink in the base. Since the distortion of the base member due to this load is eliminated, it is possible to provide an LED lamp that can stably supply power over a long period of time by eliminating the influence of the distortion on the joint portion of the power supply line.

The perspective view which looked at the LED lamp of this embodiment from diagonally upward The exploded perspective view which looked at the LED lamp of this embodiment from diagonally upward BRIEF DESCRIPTION OF THE DRAWINGS It is for demonstrating how to assemble the lighting circuit board of this embodiment, and a circuit board holder, (a) is the perspective view which looked at the state before an assembly from diagonally downward, (b) is diagonally below the state after an assembly. Perspective view The perspective view which looked at the heat radiating member of this embodiment from diagonally downward It is a figure explaining the assembly method of the LED lamp of this embodiment, (a)-(d) is the perspective view seen from diagonally upward which shows the assembly procedure. It is a figure which shows the state before assembling a translucent cover with the LED lamp of this embodiment, (a) is a top view, (b) is AA sectional drawing of (a). It is a figure explaining the assembly method of the translucent cover of this embodiment, (a) is sectional drawing of an axial length direction, (b) is the B section enlarged view of (a). A sectional view in the axial direction for explaining a state in which the heat radiating member of this embodiment is sandwiched between an insulating member and a bush, and a gap between the bush and the base member

  Preferred embodiments of the present invention will be described below with reference to the drawings. Note that this embodiment is merely an example, and the present invention is not limited to this.

    FIG. 1 is a perspective view of an LED lamp 1 according to the present embodiment as viewed from obliquely above, and FIG. 2 is an exploded perspective view of the LED lamp according to the present embodiment as viewed from obliquely above.

  As shown in FIG. 2, the LED lamp 1 includes a plurality of LED elements 21, an LED substrate 2 on which the LED elements 21 are mounted, a heat conductive mounting member 3 on which the LED substrate 2 is mounted, and the heat conductive mount. A heat radiating member 4 (heat sink) having a mounting member 3 at the other end, a translucent cover 5 covering the LED board 2, a lighting circuit board 6 on which a plurality of electronic components 61 are mounted, and the lighting circuit board 6 are accommodated. And a circuit board holder for holding the lighting circuit board 6 in the insulating casing 7 by holding the lighting circuit board 6 and the insulating casing 7 (circuit housing member) disposed in the heat radiating member 4. 8, a bush 9 that clamps and fixes the heat dissipating member 4 with the insulating housing 7, and a base member 10.

  The LED substrate 2 includes a substrate 22 and a plurality of LED elements 21 mounted on the main surface of the substrate 22, and the substrate 22 is a printed substrate such as a substantially disk-shaped glass epoxy substrate, a metal substrate, or a ceramic substrate. In this embodiment, a printed circuit board made of a metal substrate coated with an electrically insulating resin is used. In this embodiment, the LED element 21 is a high-luminance type that emits white light for illumination.

  The heat conduction mounting member 3 is made of a metal material such as aluminum having a high heat conductivity, and is mounted on the other end of a substantially bowl-shaped cylindrical heat radiating member 4 having both ends opened while the LED substrate 2 is mounted. Is done. The heat conduction mounting member 3 has a bottomed cylindrical shape having a cylindrical portion 31 and a mounting portion 32 and is attached to the mounting portion 32 in a state where the substrate lower surface 23 of the LED substrate 2 is in surface contact.

  The heat conduction mounting member 3 is provided with a plurality of screwing through holes 33 penetrating in the thickness direction and a through hole 34 for passing a power supply line from the lighting circuit. Further, the cylindrical portion 31 is provided with a positioning notch 35 for engaging the translucent cover 5. The wall surface of the cylindrical portion 31 transmits light toward the axial center of the heat conduction mounting member 4. A square hole 36 for engaging the cover 5 is formed.

  The heat radiating member 4 is formed in a hollow bowl-shaped cylindrical shape having both ends opened as shown in FIG. 2, and the outer peripheral surface of the cylindrical portion 31 of the heat conducting mounting member 4 is fitted in the other end having a large outer diameter. One end is clamped and fixed by an insulating casing 7 and a bush 9 (annular clamping member) as will be described later. The heat dissipating member 4 houses an insulating housing 7 inside, and a lighting circuit board 6 is held in the insulating housing 7.

  The heat radiating member 4 has a cylindrical wall 41 and an annular bottom wall 42 (FIG. 4) formed at the lower end (bottom surface) of the cylindrical wall 41, and the central portion of the bottom wall 42 is open.

  The heat radiating member 4 has a plurality of heat radiating fins 43 integrally formed radially on its cylindrical outer shell, and heat generated when the LED element 21 is lit is transferred from the substrate 22 of the LED substrate 2 to the heat conducting mounting member 3. It has a heat radiating function for transferring heat from the heat conduction mounting member 3 to the heat radiating member 4 and radiating heat to outside air.

  The insulating casing 7 is formed in a hollow, substantially cylindrical shape using a general-purpose resin having a thermal conductivity smaller than that of the heat radiating member 4. In this embodiment, the PBT resin is used. However, the present invention is not limited to this, and a known resin material such as PET, PC, polyimide resin or the like can be used.

As shown in FIG. 2, the insulating housing 7 includes a projecting cylindrical portion 71 that protrudes from the inside of the heat radiating member 4 to the outside through the opening of the bottom wall 42 of the heat radiating member, and the inner surface of the bottom wall 42 of the heat radiating member 4. And a cylindrical portion 73 extending from the outer peripheral edge of the abutting portion 72 in the direction opposite to the protruding direction of the protruding cylindrical portion. Is closed by the circuit board holder 8. On the outer peripheral surface of the protruding cylindrical portion 71, there is a first screw portion 74 that is screwed with a screw portion 94 formed on the inner diameter portion of the bush 9, and a second screw that is screwed with the base member 10 on the tip side. A portion 75 is formed.

A cylindrical boss 77 for screwing is established on the inner wall 76 of the cylindrical portion of the insulating housing 7 toward the opening, and the boss 77 is connected to the circuit board holder 8, the heat conduction mounting member 3, and the LED. The LED board 2 is fixed to the mounting portion 32 of the heat conductive mounting member 3 by positioning when the board 2 is assembled and tightening the screws.

  As shown in FIG. 3A, the circuit board holder 8 is formed in a bottomed shallow dish shape having a lid portion 81 and a cylindrical portion 82 by using a general-purpose resin having a small thermal conductivity similar to that of the insulating housing 7. The bottom 83 includes a holding claw 84 and a holding guide rib 85 for holding the lighting circuit board 6.

  Engaging claws 86 are formed on the outer periphery of the cylindrical portion 82 of the circuit board holder 8 to engage with the square holes 78 provided in the cylindrical portion 73 of the insulating housing 7, and positioning in the circumferential direction during assembly is performed. The projecting portion 88 is projected outward in the radial direction.

  As shown in FIG. 3B, the lighting circuit board 6 on which the plurality of electronic components 61 are mounted is held by holding claws 84 and holding guide ribs 85 of the circuit board holder 8. When the corner notch 63 provided on the outer periphery of the substrate 62 of the lighting circuit board 6 is aligned with the holding claw 84 of the circuit board holder 8 and pushed toward the bottom 83, the holding claw 84 expands outward, When all the thickness of the substrate 62 passes, the expansion is released and locked. The space in the locked state between the circuit board holder 8 and the lighting circuit board 6 is regulated by the step 89 provided on the holding guide rib 85.

  A power supply line (not shown) that feeds power to the LED board 2 is connected to the LED board 2 through the power supply line through hole 11 of the circuit board holder 8 from the opposite surface of the board 62 on which the plurality of electronic components 61 are mounted. . An integrally formed rib 12 is erected on the entire periphery of the feed line through hole 11 of the circuit board holder 8 to protect the feed line from touching the heat conduction mounting member 3 made of a metal material. ing.

  The bush 9 is formed using a general-purpose resin having a small thermal conductivity similar to the insulating housing 7, and has a cylindrical portion 91, an opening portion 92, and a flange portion 93 that extends radially outward from one end side of the opening portion 92. A screw portion 94 corresponding to a first screw portion 74 formed on the outer peripheral surface of the protruding cylindrical portion 71 of the insulating housing 7 is formed on the inner periphery of the cylindrical portion.

  The base member 10 is for screwing into the socket of the lighting fixture and receiving power from the socket. The base member 10 has a screw portion 101 and a tip portion 102 and is formed on the outer peripheral surface of the protruding cylindrical portion 71 of the insulating housing 7. Screwed into the screw portion 75.

  The translucent cover 5 is formed in a dome shape using a polycarbonate resin containing a diffusing material. An annular extending portion 51 is provided at the opening end of the translucent cover 5, and the annular extending portion 51 is for engaging and positioning with the engaging claw portion 52 and the heat conduction mounting member 3. The convex portion 53 protrudes radially outward. Along with the engagement of the square hole 36 provided in the heat conduction mounting member 3 and the engaging claw portion 52, the inner periphery of the cylindrical portion 31 and the outer periphery of the annular extension portion 51 of the heat conduction mounting member 3 are formed. Secure with adhesive.

The assembly method of the LED bulb according to the present embodiment will be described with reference to FIGS.
First, as shown in FIG. 5A, the protruding cylindrical portion 71 of the insulating housing 7 is projected from the inside of the heat radiating member 4 to the outside through the opening in the central portion of the bottom wall 42, and the bush 9 Is screwed into the first screw portion 74, and the bottom portion 42 of the heat radiating member 4 is sandwiched between the contact portion 72 of the insulating housing 7 and the flange portion 93 of the bush 9. Thereby, the insulation housing | casing 7, the thermal radiation member 4, and the bush 9 are assembled integrally. In this state, the tip end side of the protruding cylindrical portion 71 of the insulating housing 7 can be placed independently as the bottom surface 76, so that the assembly after the next step is facilitated. If a base member having a small tip area is screwed into the second screw portion 75 in the protruding portion of the insulating housing, it cannot be placed independently.

  Next, the lighting circuit board 6 is held by the holding claws 84 and the holding guide ribs 85 of the circuit board holder 8 (FIG. 3), and the plurality of electronic components 61 mounted on the lighting circuit board 6 are used as the lower surface. An engaging claw 86 inserted from the opening side of the cylindrical portion 73 of the body 7 and formed on the outer periphery of the cylindrical portion 82 of the circuit board holder 8 engages with a square hole 78 provided in the cylindrical portion 73 of the insulating housing 7. Push in.

  The heat conduction mounting member 3 is incorporated in the upper part of the circuit board holder 8. At that time, the screwing through-hole 33 of the heat conduction mounting member 3 is aligned and pushed into the cylindrical boss 77 for screwing of the insulating housing 7. Further, since the opening-side end surface 79 (FIG. 5A) of the cylindrical portion 73 of the insulating housing 7 serves as a stopper, the heat-conducting mounting member 3 is thermally conductive until the heat-conducting mounting member 3 contacts the opening-side end surface 79. The mounting member 3 is pushed into the heat radiating member 4.

  The inner diameter of the opening side end portion of the heat dissipating member 4 and the outer diameter of the heat conducting mounting member 3 are in a fitting state, so that no adhesive or the like is used. This is because the heat from the heat conductive mounting member 3 is efficiently transmitted to the heat radiating member 4.

  When the fitting of the heat dissipating member 4 and the heat conducting placement member 3 is completed, as shown in FIG. 5B, the LED substrate 2 configured by mounting a plurality of LED elements 21 on the main surface is placed on the heat conducting plate. Place on the member 3. At this time, the cylindrical boss 77 for screwing the insulating housing 7 and the substantially semicircular cutout portion 24 for screwing formed in the outer peripheral portion of the LED substrate 2 are aligned, and the screw 25 By tightening, the substrate lower surface 23 opposite to the main surface of the LED substrate 2 and the heat conductive mounting member 3 can be brought into close contact with each other, and heat generated from the LED elements 21 can be efficiently transmitted to the heat conductive mounting member 3. .

  When the attachment of the LED board 2 is completed, a power supply line from a lighting circuit (not shown) guided upward through the through hole 34 (FIG. 2) of the heat conducting placement member 3 is electrically connected to the terminal portion of the LED board 2.

Then, as shown in FIG. 5C, the base member 10 is screwed into the second screw portion 75 in the projecting portion 71 of the insulating housing 7, and a power supply line for supplying power to a lighting circuit (not shown) is soldered. By joining, the base member 10 is joined and electrically connected. As shown in FIG. 8, the heat dissipation member 4 together with the base member 10 screwed into the second screw portion 75 of the insulating housing 7 and the first screw portion 74 and screwed into the contact portion 72 of the insulating housing 7. A gap e is provided in the axial length direction of the LED lamp 1 between the bushes 9 that sandwich the LED lamp 1. This is to prevent a mechanical load for sandwiching the heat radiating member 4 from the base member 10 with the electrical wiring, and to eliminate the distortion of the base member 10 due to this load and to join the feeder line due to the distortion. The power supply can be stably supplied over a long period of time.

  Next, as shown in FIGS. 5 (d) and 7, the engaging claw portions 52 provided in the annular extending portion 51 of the translucent cover 5 are provided with the square holes 36 provided in the heat conductive mounting member 3. And is engaged from above. Along with this engagement, the inner periphery of the cylindrical portion of the heat conducting mounting member 3 and the outer periphery of the annular extending portion 51 are fixed by an adhesive.

  Thereby, the mounting of the translucent cover 5 is completed, and the LED lamp 1 is completed.

DESCRIPTION OF SYMBOLS 1 LED lamp 2 LED board 21 LED element 22 Board | substrate 23 Substrate lower surface 24 Notch part 25 Screw 3 Heat conduction mounting member 31 Tube part 32 Mounting part 33 Through hole 34 Through hole 35 Notch 36 Square hole 4 Heat radiating member 41 Tube Wall 42 Bottom wall 43 Radiating fin 5 Translucent cover 51 Ring extending portion 52 Claw portion 53 Protruding portion 6 Lighting circuit board 61 Electronic component 62 Substrate 63 Corner notch portion 7 Insulating housing 71 Projecting cylinder portion 72 Abutting portion 73 Cylindrical part 74 First threaded part 75 Second threaded part 76 Cylindrical part inner wall 77 Boss 78 Square hole 79 Open side end face 8 Circuit board holder 81 Cover part 82 Cylindrical part 83 Bottom part 84 Holding claw part 85 Holding guide rib 86 Engagement Claw 88 Protruding portion 89 Step 9 Bush 91 Tube portion 92 Opening portion 93 Hook portion 94 Screw portion 10 Base member 11 Feed wire through hole 12 Feed wire protection rib 101 Screw portion 102 Tip portion

Claims (5)

An LED substrate on which an LED element is mounted;
A cylindrical insulating housing that houses the lighting circuit board;
In an LED lamp provided with a cylindrical heat dissipation member that houses the insulating housing,
While projecting the lower end of the insulating housing from the bottom wall opening of the heat dissipation member,
A clamping member is attached to the protruding portion,
The bottom wall portion of the heat radiating member is sandwiched between the clamping member and the lower end portion of the insulating casing,
With the heat dissipation member and the insulating housing fixed,
An LED lamp characterized in that it can be placed independently with the lower end of the insulating casing as a bottom surface. In the protrusion from the bottom side opening of the heat dissipation member in the insulating housing,
The LED lamp according to claim 1, wherein a base member is mounted apart from the sandwiching member.   The LED lamp according to claim 1, wherein the clamping member is formed in an annular shape and is made of an insulating material. 4. The LED lamp according to claim 1, wherein the clamping member is screwed onto an outer periphery of a protruding portion from a bottom surface side opening of the heat radiating member in the insulating casing. The said base member is spaced apart from the said clamping member, and is screwed together in the outer periphery of the protrusion part from the bottom face side opening part of the said heat radiating member in the said insulation housing | casing. LED lamp.