Multi-directional LED lamp

A multi-directional LED lamp includes a cooling cylinder, a lamp housing unit, a lamp housing unit, a lamp cap, LED lighting unit, a driving circuit board, and a transparent lampshade unit. The transparent lampshade unit is assembled at the bottom of the cooling cylinder and covers the LED lighting unit, and a cross-sectional area of the transparent lampshade unit is greater than a cross-sectional area of the cooling cylinder, thereby outwardly protrudes from the cooling cylinder. The transparent lampshade unit includes a lower transparent lampshade and an upper transparent lampshade. The light emitting from the LED lighting unit radiates in a direction of an opposite side of the lamp cap through the lower transparent lampshade, and a part of the light reflected by the lower transparent lampshade and transmit toward a direction of the lamp cap through the upper transparent lampshade, to achieve a goal of the multi-directional lighting.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number 104102869, filed Jan. 28, 2015, which is herein incorporated by reference.

BACKGROUND

Field of Invention

The present invention relates to a LED lamp. More particularly, the present invention relates to a multi-directional LED lamp.

Description of Related Art

Since the Light Emitting Diode (LED) has the advantages of small size, low power consumption, fast response time, rich colors, and environmentally friendly, it has become an important lighting element in modern life. LED has also been widely used for the lighting of the lamps, to further form a LED lamp, such as a LED bulb.

A LED bulb using the LED as the light source has a lamp cap connector wherein the lamp cap connector connects to a driving circuit board. Since the lamp cap is the same as the lamp cap of the traditional tungsten lamp, it has the usage convenience to be assembled on the traditional lamp holder directly.

Generally the LED bulb typically contains a cooling lamp holder, a lamp cap, a LED lighting unit, a lampshade and a driving circuit board. The LED lighting unit is installed at an end of the cooling lamp holder and is covered by the lampshade. The driving circuit board is arranged at the other end of the cooling lamp holder, and is electrically connected to the LED lighting unit and the lamp cap. The heat generated by the light emitting unit passes out from the cooling lamp holder.

The elements of the LED lamp such as the driving circuit board and the cooling lamp holder are often located on the side of the lampshade facing towards the lamp cap, thereby the light emitted from the LED lighting unit in a direction towards the lamp cap will be covered by the cooling lamp holder. That is, the light emitted from the LED lighting unit can merely only radiate in a direction of the opposite side of the lamp cap, and is incapable of radiating toward a direction of the lamp cap, thus forming a dark area at the direction of the lamp cap and reducing its lighting performance.

SUMMARY

The invention provides a multi-directional LED lamp, which has the advantage of multi-direction radiating.

According to an aspect of the present invention, a multi-directional LED lamp is provided, the multi-directional LED lamp includes: a cooling cylinder, a lamp housing unit assembled at a top of the cooling cylinder, a lamp cap assembled at a top of the lamp housing unit, a LED lighting unit installed in an interior of the cooling cylinder, a driving circuit board installed in an interior of the lamp housing unit and electrically connected to the lamp cap and the LED lighting unit, and a transparent lampshade unit assembled at a bottom of the cooling cylinder and covering the LED lighting unit, wherein a cross-sectional area of the transparent lampshade unit is greater than a cross-sectional area of the cooling cylinder, to outwardly protrude from the cooling cylinder.

According to an exemplary embodiment of the present invention, the transparent lampshade unit includes an upper transparent lampshade and a lower transparent lampshade, the lower transparent lampshade assembled at a bottom of the upper transparent lampshade.

According to an exemplary embodiment of the present invention, the upper transparent lampshade is a convex lampshade, which includes an upper inner wall, a flat shade body and a lower outer wall connected in order, an inner wall of the lower outer wall has a plurality of inner notches spaced to each other. The lower transparent lampshade is a bowl lampshade, which has a bowl shade body and a convex wall connecting around the bowl shade body, the convex wall has a plurality outer hook bodies spaced to each other, and each of the outer hook bodies engaged in each of the inner notches separately.

According to an exemplary embodiment of the present invention, wherein the cooling cylinder has an annular wall, the annular wall has a first outer end and an opposite second outer end, the annular wall has a plurality of air channels running from the first outer end to the second outer end, and between the interior of the cooling cylinder is a transverse carrier plate, where the LED lighting unit is installed at a basal plane of the transverse carrier plate.

According to an exemplary embodiment of the present invention, wherein a first annular groove is set at a bottom of an inner wall of the annular wall of the cooling cylinder, the upper inner wall of the transparent lampshade unit has a plurality of first engaging sections spaced to each other, each of the first engaging sections is engaged with the first annular groove.

According to an exemplary embodiment of the present invention, wherein the lamp housing unit includes an upper lamp housing and a lower lamp housing, the lower lamp housing is assembled on a basal plane of the upper lamp housing, an interior of the upper lamp housing and an interior of the lower lamp housing form a containing room, wherein the driving circuit board is installed in the containing room.

According to an exemplary embodiment of the present invention, wherein a second annular groove is set at a top of an inner wall of the annular wall of the cooling cylinder, a bottom of the upper lamp housing of the lamp housing unit has a plurality of second engaging sections spaced to each other, each of the second engaging sections is engaged with the second annular groove.

According to an exemplary embodiment of the present invention, wherein the LED lighting unit has a substrate and a plurality of LEDs installed on the substrate.

According to the multi-directional LED lamp of the present invention, a cross-sectional area of a transparent lampshade unit is greater than a cross-sectional area of the cooling cylinder, and which protrudes from a cross-sectional of the cooling cylinder, in this way, the light emitting from the LED lighting unit radiates in a direction of an opposite side of the lamp cap through the lower transparent lampshade, a part of the light reflected by the lower transparent lampshade and transmits toward a direction of the lamp cap through the upper transparent lampshade, to achieve a goal of the multi-directional lighting and solving the problems of a dark area at the direction of the lamp cap.

DESCRIPTION OF THE EMBODIMENTS

ReferringFIG. 1toFIG. 9, according to an exemplary embodiment of the present invention, a multi-directional LED lamp includes a cooling cylinder100, a lamp housing unit200, a lamp cap300, a LED lighting unit400, a driving circuit board500and a transparent lampshade unit600is disclosed.

The cooling cylinder100is made by good heat conducting materials, such as aluminum, copper or its alloy. The cooling cylinder100includes an annular wall110, which has a first outer end111and an opposite second outer end112. The annular wall110of the cooling cylinder100is penetrated by a plurality of air channels120running through the first outer end111to the second outer end112. A transverse carrier plate130is disposed between inner walls of the interior of cooling cylinder100. Besides, a first annular groove140is set at a bottom of the inner wall of the annular wall110of the cooling cylinder100and a second annular groove150is set at a top of the inner wall of the annular wall110of the cooling cylinder100.

The lamp housing unit200includes an upper lamp housing210and a lower lamp housing220. The lower lamp housing220is assembled at a basal plane of the upper lamp housing210. An interior of the upper lamp housing210and an interior of the lower lamp housing220form a containing room230. The lamp cap300is assembled at a top of the upper lamp housing210of the lamp housing unit200. The driving circuit board500is installed in the containing room230of the interior of the lamp housing unit200, and is electrically connected to the lamp cap300and the LED lighting unit400. A bottom of the upper lamp housing210of the lamp housing unit200has a plurality of second engaging sections211spaced to each other, each of the second engaging sections211is engaged with the second annular groove150of the cooling cylinder100.

The LED lighting unit400has a substrate410and a plurality of LEDs420installed on the substrate410. The LED lighting unit400is installed on the basal plane of the transverse carrier plate130of the cooling cylinder100, and facing an opposite end of the lamp cap300, that is, facing the direction of the transparent lampshade unit600. Besides passing via the transverse carrier plate130and via a surface of the annular wall110of the cooling cylinder100, the heat generated during the operation of the LEDs420can also pass by the natural convection of the air channels120at the same time.

The transparent lampshade unit600is assembled at the bottom of the cooling cylinder100, and covers the LED lighting unit400. A cross-sectional area of the transparent lampshade unit600is greater than a cross-sectional area of the cooling cylinder100, to thereby outwardly protrude from the cooling cylinder100.

The transparent lampshade unit600includes an upper transparent lampshade610and a lower transparent lampshade620. The lower transparent lampshade620is assembled at the bottom of the upper transparent lampshade610. Wherein the upper transparent lampshade610is a convex lampshade, which includes an upper inner wall611, a flat shade body612, and a lower outer wall613connected in order, an inner wall of the lower outer wall613has a plurality of inner notches614spaced to each other. And the lower transparent lampshade620is a bowl lampshade, which has a bowl shade body621and an annular wall622connecting around the bowl shade body621, the annular wall622has a plurality of outer hook bodies623spaced to each other, and each of the outer hook bodies623is engaged with one of the inner notches614of the upper transparent lampshade610, to combine the upper transparent lampshade610and the lower transparent lampshade620together. In addition, the upper inner wall611of the transparent lampshade unit600has a plurality of first engaging sections615spaced to each other, which engage with the first annular groove140at the bottom of the cooling cylinder100. Since the transparent lampshade unit600is assembled at the cooling cylinder100by the upper inner wall611of the upper transparent lampshade610, the flat shade body612of the upper transparent lampshade610therefore is outwardly protrude from the cooling cylinder100a width W.

Referring toFIG. 10in conjunction withFIG. 1-FIG. 9, according to an exemplary embodiment of the multi-directional LED lamp of the present invention, since the flat shade body612of the upper transparent lampshade610of the transparent lampshade unit600is not covered by the cooling cylinder100at the direction of the lamp cap300, therefore, the light emitted by the LED lighting unit400can radiate in a direction opposite to the lamp cap300through the bowl shade body621and the annular wall622of the lower transparent lampshade620, a part of the light can also reflect by the bowl shade body621and transmits toward a direction of the lamp cap300through the flat shade body612of the upper transparent lampshade610, thereby achieving a goal of the multi-directional lighting and solving the problems of a dark area at the direction of the lamp cap300.