WO2019037752A1

WO2019037752A1 - Led lamp

Info

Publication number: WO2019037752A1
Application number: PCT/CN2018/101872
Authority: WO
Inventors: Guozhong Zhang; Zhanzhou Chen; Jinxiang Shen
Original assignee: Zhejiang Shenghui Lighting Co., Ltd.
Priority date: 2017-08-23
Filing date: 2018-08-23
Publication date: 2019-02-28
Also published as: CN107339619A

Abstract

An LED lamp includes a lamp cover, a light-emitting element disposed inside the lamp cover, and a lamp socket connected to the lamp cover and including two through-holes for mounting the two lamp pins. The light-emitting element includes a PCB, a metal heat sink connected to the PCB, and two lamp pins. The PCB houses LED light-source assemblies and a driving power supply. A top and bottom surfaces of the PCB respectively house one of the LED light-source assemblies. The driving power supply is disposed on at least one of the top surface of the PCB or the bottom surface of the PCB and is electrically connected to each LED light-source assembly. One end of each lamp pin is electrically connected to the driving power supply, and another end extends out from one of the through-holes to be connected to an external power supply.

Description

LED LAMP

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 201710729593.9, filed on August 23, 2017, the entire contents of which are incorporated herein by reference.

FIELD OF THE TECHNOLOGY

The disclosure relates to the technical field of light-emitting diode (LED) lamps, and in particular to an LED lamp.

BACKGROUND

LED lamps are widely used in various fields due to their advantages of low energy consumption, long lifetime and brilliant colors. An LED lamp generally includes a lamp cover, a light-emitting element, and a lamp socket. The light-emitting element includes a printed circuit board (PCB) , an LED light-source assembly, a driving power supply, a metal heat sink and two lamp pins.

A conventional LED lamp is usually directly sealed by silica gel, resulting in poor heat dissipation inside the lamp cover. In addition, light distribution angles of the conventional LED lamp are difficult to control, leading to defects such as uneven illumination and narrow illumination angle, which seriously affects the reliability and lighting coverage of the LED lamp.

SUMMARY

To solve the above technical problem that the conventional LED lamp is usually directly sealed by silica gel and has poor heat dissipation inside the lamp cover, the present disclosure provides an LED lamp.

The LED lamp includes a lamp cover, a light-emitting element disposed inside the lamp cover, and a lamp socket. The light-emitting element includes a printed circuit board (PCB) , a metal heat sink connected to the PCB, and two lamp pins. The lamp socket includes two through-holes configured to mount the two lamp pins. The PCB is configured to house LED light-source assemblies and a driving power supply. A top surface of the PCB and a bottom surface of the PCB respectively house one of the LED light-source assemblies. The driving power supply is disposed on the top surface of the PCB and/or the bottom surface of the PCB. The driving power supply is electrically connected to each of the LED light-source assemblies. A first end of each lamp pin is electrically connected to the driving power supply. A second end of each lamp pin extends out from one of the through-holes to be connected to an external power supply.

Optionally, an inner side wall of the lamp voce and an inner bottom wall of the lamp cover include, respectively, the plurality of protrusions and/or a plurality of recesses.

Optionally, the plurality of protrusions or the plurality of recesses is strip-shaped.

Optionally, the plurality of protrusions on the inner side wall of the lamp cover being perpendicular to the plurality of protrusions on the inner bottom wall of the lamp cover and/or the plurality of the recesses on the inner bottom wall of the lamp cover.

Optionally, the plurality of recesses on the inner side wall of the lamp cover is perpendicular to the plurality of protrusions on the inner bottom wall of the lamp cover and/or the plurality of the recesses on the inner bottom wall of the lamp cover.

Optionally, a cross-section of the plurality of protrusions or the plurality of recesses has a triangular shape.

Optionally, the lamp cover is a barrel-shaped lamp cover including an open end and a closed end, and two opposite portions of side walls of the lamp cover close to the closed end of the lamp cover are recessed inward to form a hand holder.

Optionally, an inner edge of the open end of the lamp cover includes two oppositely-located positioning slots, and the positioning slots are configured to direct two sides of the light-emitting element to be inserted into the lamp cover along the two positioning slots.

Optionally, an inner edge of the open end of the lamp cover includes a notch; and the lamp socket includes an engaging element configured to engage with the notch.

Optionally, the PCB is a multi-layer board including a top layer, a bottom layer, and one or more middle layers. The top layer of the multi-layer board and the bottom layer of the multi-layer board house one of the LED light-source assemblies. The one or more middle layers of the multi-layer board are coated with copper foils. The driving power supply is disposed on the top layer of the multi-layer board and/or the bottom layer of the multi-layer board houses.

Optionally, the light-emitting element includes two PCBs: a first PCB and a second PCB. A middle portion of the first PCB includes a strip-shaped opening. The second PCB is configured to pass through the strip-shaped opening. A cross section of the two PCBs has a cross shape.

Optionally, the metal heat sink has a cylindrical structure. The metal heat sink is sleeved at an end of the PCB close to the lamp pins. An inner diameter of the metal heat sink is the same as a width of the end of the PCB close to the lamp pins.

Optionally, the width of the end of the PCB close to the lamp pins is less than a width of an end of the PCB distal from the lamp pins.

Optionally, a material of the lamp cover includes polycarbonate (PC) .

In the LED lamp provided in this embodiment, the driving power supply is electrically connected to each of the LED light-source assemblies. One end of each lamp pin respectively extends out from one of the through-holes to be electrically connected to the external power supply. Such that, the driving power supply can drive the LED light-source assemblies to emit light, and the metal heat sink disposed on the PCB can facilitate heat dissipation of each element on the PCB. The top surface of the PCB and bottom surface of the PCB respectively house one of the LED light-source assemblies, resulting in a uniform illumination, multiple sources to emit light, and light emitted in all directions. It is easy and convenient to assemble and disassemble the lamp cover and the lamp socket, thereby facilitating a post-inspection and maintenance of elements inside the lamp cover. According to embodiments of the present disclosure, the LED lamp solves the problem of poor heat dissipation of the conventional LED lamp due to the sealing of the silica gel. In addition, the LED lamp has an uniform illumination, a wider irradiation angle, and improved lighting coverage and reliability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an overall structural view of an LED lamp according to some embodiments of the present disclosure;

FIG. 2 is a top plan view of an LED lamp according to some embodiments of the present disclosure;

FIG. 3 is an overall structural view of an LED lamp according to some other embodiments of the present disclosure;

FIG. 4 is a structural view of a top surface of a printed circuit board (PCB) in an LED lamp according to some embodiments of the present disclosure;

FIG. 5 is a structural view of a bottom surface of a PCB in an LED lamp according to some embodiments of the present disclosure;

FIG. 6 is a perspective structural view of a lamp cover in an LED lamp according to some embodiments of the present disclosure;

FIG. 7 is a top plan view of a lamp cover in an LED lamp according to some embodiments of the present disclosure;

FIG. 8 is an overall structure of an LED lamp according to some other embodiments of the present disclosure; and

FIG. 9 is a left-side view of the LED lamp according to some embodiments of the present disclosure.

DETAILED DESCRIPTION

FIG. 1 is an overall structural view of an LED lamp according to some embodiments of the present disclosure. FIG. 2 is a top plan view of an LED lamp according to some embodiments of the present disclosure. FIG. 3 is an overall structural view of an LED lamp according to some other embodiments of the present disclosure. FIG. 4 is a structural view of a top surface of a printed circuit board (PCB) in an LED lamp according to some embodiments of the present disclosure. FIG. 5 is a structural view of a bottom surface of a PCB in an LED lamp according to some embodiments of the present disclosure. As shown in FIGS. 1-5, according to embodiments of the present disclosure, an LED lamp includes a lamp cover 10, a light-emitting element 20 disposed inside the lamp cover 10, and a lamp socket 30 connected to the lamp cover 10. The light-emitting element 20 includes a PCB 21, a metal heat sink 22 connected to the PCB 21, and two lamp pins 23. A top surface of the PCB 21 and a bottom surface of the PCB 21, respectively, house one of the LED light-source assemblies 24. A driving power supply 25 may be disposed on the top surface of the PCB 21 and/or the bottom surface of the PCB 21. The driving power supply 25 is electrically connected to each of the LED light-source assemblies 24. One end of each lamp pin 23 is connected to the driving power supply 25. The lamp socket 30 includes two through-holes 31 for mounting of the two lamp pins. The other end of each lamp pin 23 respectively extends out from each of the through-holes 31 to be connected to an external power supply.

According to embodiments of the present disclosure, the driving power supply 25 can be soldered to the top surface of the PCB 21 and/or the bottom surface of the PCB 21, which is not limited by the present disclosure. In some embodiments, as shown in FIG. 4, the driving power supply 25 may be soldered to the top surface of the PCB 21. The driving power supply 24 may be connected to each LED of the LED light-source assemblies 24. The driving power source 25 is electrically connected to one end of each of the two lamp pins 23, and the other end of each of the two lamp pins 23 respectively extends out from each of the through-holes 31 to be electrically connected to the external power supply. Such that, the driving power supply 25 can convert a voltage provided by the external power supply to a light-emitting voltage for each LED of the LED light-source assemblies 24. The driving power supply 25 is configured to convert the voltage provided by the external power supply to a voltage (e.g., the light-emitting voltage) compatible/suitable for the LED light-source assemblies 24. Types and voltage magnitudes of the driving power supply 25 and the external power supply are not limited by the present disclosure.

Further, the driving power supply 25 is electrically connected to the external power supply, and the driving power supply 25 can convert the voltage provided by the external power supply to the light-emitting voltage for each LED of the LED light-source assemblies 24. Thus, each LED of the LED light-source assemblies 24 can emit light. As shown in FIG. 4 and FIG. 5, in some embodiments, the top surface of the PCB 21 and the bottom surface of the PCB 21 are respectively soldered with one of the LED light-source assemblies 24. The LED light-source assembly 24 on the top surface of the PCB 21 may be symmetrically or asymmetrically arranged with respect to the LED light-source assembly 24 on the bottom surface of PCB 21. Both the top surface of the PCB 21 and the bottom surface of the PCB 21 are soldered with an LED light-source assembly 24. The arrangement of the LED light-source assembly 24 on the top surface of the PCB 21 and the LED light-source assembly 24 on the bottom surface of PCB 21 is not limited by the present disclosure. When the PCB 21 is placed vertically, the LED light-source assembly 24 is soldered on both sides of the PCB 21 and each LED light-source assembly may include a plurality of LEDs (e.g., LED chips) . Therefore, there are many light sources on the PCB 21, and the double-sided arrangement of the LED light-source assemblies 24 on the PCB 21 can ensure uniform light emission. Specific models and sizes of the LED light-source assemblies 24 are not limited by the present disclosure. All the LEDs of the LED light-source assemblies 24 can emit light and the LED light-source assemblies 24 can be disposed inside the lamp cover 10.

Further, a large amount of heat may be generated during an operating process of the driving power supply 25, a light emitting process of the LED light-source assemblies 24, and operating processes of other elements on the PCB 21. To dissipate the heat generated by each element on the PCB 21, the metal heat sink 22 may be connected to the PCB 21, improving the reliability of the LED lamp. In some embodiments, the metal heat sink 22 may have a cylindrical shape or may be a set of metal heat-dissipating fins. The metal heat sink 22 can dissipate the heat generated on each element of the PCB 21. Shapes and materials of the metal heat sink 22 are not limited by the present disclosure. In some embodiments, as shown in FIG. 1, the metal heat sink 22 has a cylindrical shape.

Further, in some embodiments, as shown in FIG. 1 and FIG. 3, the two lamp pins 23 may be U-shaped or pin-shaped. The two lamp pins can be connected to the driving power supply 25 and the external power supply. Shapes of the two lamp pins 23 are not limited by the present disclosure. If the two lamp pins are U-shaped, any one of two open ends of the two lamp pins may be electrically connected to the driving power supply 25. Optionally, both two open ends of the two lamp pins may be electrically connected to the driving power supply 25. Lengths of two open ends of the two lamp pins may be the same or different, which is not limited by the present disclosure. In some embodiments, as shown in FIG. 1, the two lamp pins 23 are U-shaped.

Further, FIG. 1 and FIG. 3 show two shapes of the lamp socket 30 according to some embodiments of the present disclosure. In some embodiments, the lamp socket 30 may have an irregular shape or a regular shape, e.g., a cylindrical shape. The lamp socket 30 can be firmly connected to the lamp cover 10, and the lamp pins 23 can pass through the lamp socket 30. Shapes and materials of the lamp socket are not limited by the present disclosure. One end of the lamp pins 23 are electrically connected to the driving power supply 25, and the driving power supply 25 is soldered on the PCB 21. Thus, when the two lamp pins 23 respectively pass through the through-holes 31, it is possible to ensure the PCB 21 to be placed vertically and to ensure insulation of each lamp pin 23. Sizes and lengths of the through-holes 31 can be determined by the sizes and lengths of the lamp pins 23, which is not limited by the present disclosure.

Further, in some embodiments, the lamp cover 10 and the lamp socket 30 can be fixedly connected with each other by gluing or a buckle. The connection method of the lamp cover 10 with the lamp socket 30 is not limited by the present disclosure. Moreover, the lamp cover 10 may have a spherical shape, a cylindrical shape, or an irregular shape. The lamp cover 10 is able to cover the light-emitting element 20 and satisfy a basic light-transmission requirement. Shapes and materials of the lamp cover 10 are not limited by the present disclosure. Optionally, the lamp cover 10 may be made of a poly carbonate (PC) material. The PC material has advantages, such as: a relatively high strength and elastic modulus, a high impact strength, a wide applicable temperature range, a high transparency, a free dyeability, a low molding shrinkage rate, a good dimensional stability, excellent electrical properties, no odor, non-toxicity to human body, and satisfying requirements of safety and health. Therefore, the lamp cover made of the PC material may have the above advantages, and the LED lamp can have an uniform illumination, and good light transmittance, thereby improving the reliability and the lighting coverage of the LED lamp.

In some embodiments, a process of illumination using the LED lamp may be as the following.

The driving power supply 25 is electrically connected to the LED light-source assemblies 24 on the top surface of the PCB and bottom surface of the PCB 21; the driving power supply 25 is electrically connected to one end of each of the lamp pins 23; and the PCB 21 is electrically connected to the metal heat sink 22. The other ends of the lamp pins 23 respectively pass through the two through-holes 31 of the lamp socket 30, and the lamp cover 10 is sleeved outside the light-emitting element 20, such that the lamp cover 10 can be fixedly connected to the lamp socket 30. In this way, it is easy and convenient to assemble of the LED lamp.

Then, the external power supply can supply power to the LED lamp through an electrical connection between the external power supply and the other end of each of the lamp pins 23. The driving power supply 25 in the light-emitting element 20 can convert the voltage of the external power supply into the light-emitting voltage for each LED of the LED light-source assemblies 24, such that each LED in the LED light-source assemblies 24 can emit light.

On the one hand, the LED light-source assemblies 24 are disposed on both the top surface of the PCB 21 and the bottom surface of the PCB 21, thus, the LED lamp can emit light in all directions and have an uniform illumination. On the other hand, the material of the lamp cover 10 can increase the illumination angle of the light emitted by the LED light-source assemblies 24 through the lamp cover 10, thus, the luminous flux and the lighting coverage of the LED lamp may also be improved. In addition, the arrangement of the metal heat sink 22 may also ensure the heat dissipation of each element on the PCB 21, thereby increasing the lifetime of the LED lamp.

In the LED lamp provided in this embodiment, the driving power supply is electrically connected to each of the LED light-source assemblies. One end of each lamp pin respectively extends out from each through-hole and is electrically connected to the external power supply. Such that, the driving power supply can drive the LED light-source assemblies to emit light, and the metal heat sink disposed on the PCB can facilitate heat dissipation of each element on the PCB. The top surface of the PCB and bottom surface of the PCB respectively house one of the LED light-source assemblies, resulting in a uniform illumination, multiple sources to emit light, and light emitted in all directions. It is easy and convenient to assemble and disassemble the lamp cover and the lamp socket, thereby facilitating a post-inspection and maintenance of elements inside the lamp cover. According to embodiments of the present disclosure, the LED lamp solves the problem of poor heat dissipation of the conventional LED lamp due to the sealing of the silica gel. In addition, the LED lamp has an uniform illumination, a wider irradiation angle, and improved lighting coverage and reliability.

FIG. 6 is a perspective structural view of a lamp cover in an LED lamp according to some embodiments of the present disclosure; FIG. 7 is a top plan view of a lamp cover in an LED lamp according to some embodiments of the present disclosure; FIG. 8 is an overall structure of an LED lamp according to some other embodiments of the present disclosure; and FIG. 9 is a left-side view of the LED lamp according to some embodiments of the present disclosure. Referring to FIGS. 6-8, below describes exemplary structures of the LED lamp.

To further increase the lighting coverage of the LED lamp, as shown in FIGS. 6-7, in some embodiments, an inner side wall of the lamp cover 10 and an inner bottom wall of the lamp cover 10 may include protrusions and/or recesses. The inner side wall of the lamp cover 10 and the inner bottom wall of the lamp cover 10 may include only the protrusions, only the recesses, or both the protrusions and the recesses, which is not limited by the present disclosure.

Further, either the protrusions or the recesses can cause an inner surface of the lamp cover 10 unsmooth. The light emitted from the LED light-source assemblies 24 may be refracted at the protrusions or the recesses, thereby increasing the irradiation angle and the luminous flux of the LED lamp.

Further, according to embodiments of the present disclosure, the protrusions and the recesses may have various shapes, which are not limited by the present disclosure. As shown in FIG. 6 and FIG. 7, optionally, the protrusions and/or the recesses may be strip-shaped. Further, in some embodiments, the strip-shaped protrusions and the strip-shaped recesses may be evenly spaced or not evenly spaced on the inner side wall of the lamp cover 10 and the inner bottom wall of the lamp cover 10. The strip-shaped projections and the strip-shaped recesses may be disposed through or not through the inner side wall of the lamp cover 10 and the inner bottom wall of the lamp cover 10, which is not limited by the present disclosure.

In some embodiments, cross sections of the protrusions and the recesses may also include various shapes. The cross sections of the protrusions and the recesses may be regular shapes or irregular shapes and are not limited by embodiments of the present disclosure. As shown in FIGS. 6-7, optionally, the protrusions and/or recesses may have triangular-shaped cross sections. When the cross section of the protrusions and/or the recesses are triangle-shaped, it is more possible to refract the emitted light by the LED light-source assemblies 24. Quantity and sizes of the protrusions and recesses are not limited by the present disclosure.

Further, a positional relationship between the protrusions and the recesses is not limited by the present disclosure. The lamp cover 10 may be manufactured by using a mold. To simply a fabrication process of the mold, and reduce cost, as shown in FIGS. 6-7, optionally, the protrusions on the inner side wall of the lamp cover 10 may be perpendicular to the protrusions and/or recesses on the inner bottom wall of the lamp cover 10. Optionally, the strips of the recesses on the inner side wall of the lamp cover 10 may be perpendicular to the strips of the protrusions and/or recesses on the inner bottom wall of the lamp cover 10.

In some implementation manners, when the inner side wall of the lamp cover 10 includes only protrusions, the inner bottom wall of the lamp cover 10 may include only protrusions, or only recesses, or may include protrusions and recesses, which is not limited by the present disclosure. In some embodiments, the protrusion on the inner side wall of the lamp cover 10 may be perpendicular to the protrusions or recesses on the inner bottom wall of the lamp cover 10.

In some other implementation manners, when the inner side wall of the lamp cover 10 includes only recesses, the inner bottom wall of the lamp cover 10 may include only protrusions, or only recesses, or may include both protrusions and recesses, which is not limited by the present disclosure. In some embodiments, the recesses on the inner side wall of the lamp cover 10 may be perpendicular to the protrusions or recesses on the inner bottom wall of the lamp cover 10.

Further, using either one of the above implementation manners, the light emitted from the LED light-source assemblies 24 can be refracted in all directions. The protrusions and the recesses can refract the light emitted from the LED light-source assemblies 24 in all directions (e.g., 360 degrees around a cylindrical lamp) , thereby increasing the irradiation angle of the LED lamp, and improving the lighting coverage of the LED lamp. In addition, the mold for manufacturing the lamp has a simple overall structure, and is easy to install and operate, thereby reducing the cost.

In addition, the shape of the lamp cover 10 can be determined according to the actual situation, which is not limited by the present disclosure. As shown in FIGS. 8-9, the lamp cover 10 may be a barrel-shaped lamp cover 10 that is open at one end. Two opposite portions of side walls of the lamp cover 10 close to a closed end of the lamp cover 10 may be recessed inward to form a hand holder 11.

In some embodiments, the hand holder 11 may have a regular shape or an irregular shape, and the present embodiment does not limit a shape and a size of the hand holder 11. The hand holder 11 is configured to facilitate the user to hold the lamp cover 10. During the installation process of the lamp cover 10, the user can hold the lamp cover by using the hand holder 11 to install the lamp cover 10. In addition, the aesthetic appearance of the lamp cover 10 is increased, and the weight of the LED lamp is reduced while the light emitted by the LED lamp is ensured.

Further, in some embodiments, a width of the PCB 21 may be slightly smaller than an inner diameter of the lamp cover 10, so that the PCB 21 can accommodate more LED light-source assemblies 24, thereby increasing sources to emit light. Moreover, the lamp cover 10 includes a hand holder 11, and a radial space of the lamp cover 10 at the hand holder 11 may be reduced. Optionally, to facilitate the accommodation of the light-emitting element 20 within the lamp cover 10, as shown in FIGS. 6-8, there are two opposite positioning slots 12 disposed on an inner edge of the open end of the lamp cover 10. Two sides of the light-emitting element 20 can be inserted into the lamp cover 10 along the two positioning slots 12.

The two positioning slots 12 can direct/guide the light-emitting element 20 to be inserted into the lamp cover 10 at a specific position. During the process of the light-emitting element 20 being inserted into the lamp cover 10, the two positioning slots 12 can prevent the light-emitting element 20 from being blocked by the hand holder 11. Such that, the light-emitting element 20 can be stably disposed inside the lamp cover 10 with minimal manual effort, and there is no need to make repeated attempts of inserting the light-emitting component 20 into the lamp cover 10 to ensure a tight fit, improving a working efficiency of assembling the LED lamp.

Further, due to the presence of the hand holder 11 on the lamp cover 10, the light-emitting element 20 may not be able to rotate along with the lamp cover 10. In some embodiments, the lamp cover 10 and the lamp socket 30 can be reliably connected by a buckle connection. As shown in FIG. 6 and FIG. 8, optionally, an inner edge of the open end of the lamp cover 10 may include a notch 13, and the lamp socket 30 may include an engaging element 32 configured to engage with the notch 13.

In some embodiments, the lamp cover 10 may be sleeved on the lamp socket 30. The notch 13 can engage with the engaging element 32 to achieve a fixed connection between the lamp cover 10 and the lamp socket 30. The notch 13 has a one-to-one correspondence with the engaging element 32. A quantity and shape of the notch 13 and the engaging element 32 are not limited by the present disclosure.

In addition, the top surface of the PCB 21 and the bottom surface of the PCB board 21 respectively house one of the LED light-source assemblies 24. The PCB 21 may be a double-sided board or a multi-layer board, which is not limited by the present disclosure. Optionally, the PCB 21 may be a multi-layer board, and a top layer of the multi-layer board and a bottom layer of the multi-layer board may respectively house one of the LED light-source assemblies 24. The remaining layers of the multi-layer board may be coated with copper foils. The top layer of the multi-layer board and/or the bottom layer of the multi-layer board may include the driving power supply 25. The present disclosure dose not limit the area of the copper foil on each of the remaining layers of the multi-layer board. Areas of the copper foils on the remaining layers may be the same or different.

The LED light-source assemblies 24 are required to be disposed on both the top surface of the PCB 21 and the bottom surface of the PCB 21. If the PCB 21 is the multi-layer board, the LED light-source assemblies 24 may be soldered on both the top layer of the multi-layer board and the bottom layer of the multi-layer board, such that the LED light-source assemblies 24 is able to emit light in all directions. Moreover, the remaining layers in the multi-layer board are soldered with copper foil to dissipate heat generated from the elements on the multi-layer board, increasing the lifetime of the LED lamp.

Further, the quantity of the PCB 21 in the embodiment may be one or two, which is not limited by the present disclosure. Optionally, the quantity of the PCBs 21 may be two. One of the PCBs 21 may include a strip-shaped opening in the middle thereof, and the other PCB 21 may be inserted into the strip-shaped opening, so that a cross-section of the two PCBs 21 has a cross shape. For example, a first PCB has a planar shape and includs a strip-shaped opening in the middle thereof. A second PCB can be assembled with the first PCB by inserting the second PCB into the strip-shaped opening of the first PCB perpendicularly. No LED light-source assembly is disposed in a portion of the second PCB where the second PCB is in the strip-shaped opening of the first PCB. That is, the portion of the second PCB being covered by the first PCB after inserting the second PCB to the strip-shaped opening of the first PCB does not house any LED. The width of the strip-opening of the first PCB may be substantially the same as the thickness of the second PCB for a compatible fit. Such that, the second PCB can be inserted into the strip-shaped opening of the first PCB.

In some embodiments, there are two PCBs 21. One PCB 21 can be inserted into a strip-shaped opening of the other PCB 21, and the two PCBs 21 are fixedly connected with each other by soldering. The two PCBs 21 can be sleeved in the lamp cover 10. Layouts of the driving power supply 25, and the LED light-source assemblies 24 on the two PCBs 21 are not limited by the present disclosure. The two PCBs 21 may be connected by other method, which is not limited by the present disclosure.

In some embodiments, when there are two PCBs 21, correspondingly, there are four positioning slots 12 disposed on the inner edge of the lamp cover 10. For example, the four poisoning slots 12 include two opposite pairs of positioning slots 12. The two opposite pairs of poisoning slots 12 can direct/guide the two PCBs 21 to be inserted into the lamp cover 10, where one of PCBs 21 is inserted into the strip-shaped opening of the other PCB 21. The quantity of the positioning slot 12 can be determined according to the quantity of the PCB 21 and is not limited by the present disclosure.

The present disclosure does not limit the shape of the metal heat sink 22. In some embodiments, the metal heat sink 22 may be a metal plate disposed on the PCB 21, or may have other shapes. To improve the heat dissipation of the metal heat sink 22, as shown in FIG. 8, optionally, the metal heat sink 22 may have a cylindrical structure. The metal heat sink 22 may be sleeved at one end of the PCB 21 close to the lamp pin 23. The inner diameter of the metal heat sink 22 may be the same as the width of the end of the PCB 21 close to the lamp pin 23.

According to embodiments of the present disclosure, the metal heat sink 22 can be a cylindrical structure, the inner diameter of the metal heat sink 22 can be the same as the width of the end of the PCB 21 close to the lamp pin 23. Therefore, the metal heat sink 22 can be sleeved at one end of the PCB 21 close to the lamp pin 23 to achieve a reliable connection between the metal heat sink 22 and the PCB 21. The metal heat sink 22 can dissipate heat generated by the elements on the PCB 21. In some embodiments, the metal heat sink 22 can also be soldered on the PCB 21 to achieve the connection between the metal heat sink 22 and the PCB 21, and the metal heat sink 22 can also dissipate heat generated by the elements on the PCB 21. The connection method is not limited by the present disclosure.

Further, in some embodiments, the width of one end of the PCB 21 distal from the lamp pin 23 may be slightly smaller than the inner diameter of the lamp cover 10, such that the light-emitting element 20 and the metal heat sink 22 to be accommodated within the lamp cover 10. Optionally, the width of one end of the PCB 21 close to the lamp pin 23 may be smaller than the width of the end of the PCB 21 distal from the lamp pin 23.

The inner diameter of the metal heat sink 22 is the same as the width of the end of the PCB 21 close to the lamp pin 23, thus, the outer diameter of the metal heat sink 22 may be smaller than or equal to the width of the end of the PCB 21 distal from the lamp pin 23. In this way, the lamp cover 10 can be smoothly disposed outside the metal heat sink 22, and the area of the metal heat sink 22 is sufficiently large to improve the heat dissipation of the metal heat sink 22 on the LED lamp.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limiting the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in the foregoing embodiments or equivalently replace some or all of the technical features; and these modifications or replacements do not deviate the scope of the present disclosure.

Claims

An LED lamp, comprising:

a lamp cover;

a light-emitting element disposed inside the lamp cover and including a printed circuit board (PCB) , a metal heat sink connected to the PCB, and two lamp pins; and

a lamp socket connected to the lamp cover and including two through-holes configured to mount the two lamp pins;

wherein:

the PCB are configured to house LED light-source assemblies and a driving power supply;

a top surface of the PCB and a bottom surface of the PCB respectively house one of the LED light-source assemblies,

the driving power supply is disposed on at least one of the top surface of the PCB or the bottom surface of the PCB, the driving power supply being electrically connected to each of the LED light-source assemblies, and

a first end of each lamp pin is electrically connected to the driving power supply, and a second end of each lamp pin extends out from one of the through-holes to be connected to an external power supply.
The LED lamp according to claim 1, wherein:

an inner side wall of the lamp cover and an inner bottom wall of the lamp cover include, respectively, at least one of: a plurality of protrusions or a plurality of recesses.
The LED lamp according to claim 2, wherein:

the plurality of protrusions or the plurality of recesses is strip-shaped.
The LED lamp according to claim 3, wherein:

the plurality of protrusions on the inner side wall of the lamp cover is perpendicular to the at least one of: the plurality of protrusions on the inner bottom wall of the lamp cover or the plurality of the recesses on the inner bottom wall of the lamp cover.
The LED lamp according to claim 3, wherein:

the plurality of recesses on the inner side wall of the lamp cover is perpendicular to at least one of: the plurality of protrusions on the inner bottom wall of the lamp cover or the plurality of the recesses on the inner bottom wall of the lamp cover.
The LED lamp according to claim 2, wherein:

a cross-section of the plurality of protrusions or the plurality of recesses has a triangular shape.
The LED lamp according to claim 1, wherein:

the lamp cover is a barrel-shaped lamp cover including an open end and a closed end, and two opposite portion of side walls of the lamp cover close to the closed end of the lamp cover are recessed inward to form a hand holder.
The LED lamp according to claim 7, wherein:

an inner edge of the open end of the lamp cover includes two oppositely-located positioning slots, and the positioning slots are configured to direct two sides of the light-emitting element to be inserted into the lamp cover along the two positioning slots.
The LED lamp according to claim 7, wherein:

an inner edge of the open end of the lamp cover includes a notch; and

the lamp socket includes an engaging element configured to engage with the notch.
The LED lamp according to claim 1, wherein:

the PCB is a multi-layer board including a top layer, a bottom layer, and one or more middle layers;

the top layer of the multi-layer board and the bottom layer of the multi-layer board house one of the LED light-source assemblies;

the one or more middle layers of the multi-layer board are coated with copper foils; and

at least one of the top layer of the multi-layer board or the bottom layer of the multi-layer board houses the driving power supply.
The LED lamp according to claim 1, wherein the light-emitting element comprises two PCBs including a first PCB and a second PCB, wherein:

a middle portion of the first PCB includes a strip-shaped opening;

the second PCB is configured to pass through the strip-shaped opening; and

a cross section of the two PCBs has a cross shape.
The LED lamp according to claim 1, wherein:

the metal heat sink has a cylindrical structure;

the metal heat sink is sleeved at an end of the PCB close to the lamp pins; and

an inner diameter of the metal heat sink is the same as a width of the end of the PCB close to the lamp pins.
The LED lamp according to claim 11, wherein:

the width of the end of the PCB close to the lamp pins is less than a width of an end of the PCB distal from the lamp pins.
The LED lamp according to claim 1 wherein:

a material of the lamp cover includes polycarbonate (PC) .