Lamp heat dissipating structure

A heat dissipating structure for a lamp includes at least an illuminating element, a lamp base, a metal housing, a ring-shaped coil and a metal base. The metal housing has a great heat conducting capability, and the illuminating element is mounted on the lamp base, which is engaged with the metal housing. The ring-shaped coil which includes a primary winding and a secondary winding wound on a ring iron core is mounted between the metal housing and lamp base, wherein the ring iron core further includes an inner space for accommodating plural electronic components connected with the secondary winding, and the ring-shaped coil is electrically connected with the illuminating element and metal base. And, the metal base is electrically connected to a power source, so that through a conduction of the metal base, the ring-shaped coil can acquire and transform electricity to provide to the illuminating element for operation.

FIELD OF THE INVENTION

The present invention is related to a heat dissipating structure for a lamp, and more particularly to a heat dissipating structure for a lamp base, so as to provide a heat dissipating function therefor.

BACKGROUND OF THE INVENTION

Currently, the main illumination instruments are still incandescent lamps (and also the energy saver fluorescent lamps) since most families, offices and public places still employ the base structure for the incandescent lamps, and also the newly developed LED illuminations are still not popular. A conventional lamp is illustrated in R.O.C. Patent No. M305303, entitled “Structure improvement of fluorescent bulb”, whose abstract disclosed that “The present application is related to an improved fluorescent bulb structure so as to provide a more practical efficacy, including two light permeable half plastic housings, a fluorescent tube, a positioning base, an auxiliary sleeve, a circuit board; and a conducting head, wherein the circuit board is fixedly mounted on the positioning base and the auxiliary sleeve in advance, and then assembled within the conducting head and the housings for reducing the total volume, and also, the plastic housings which are not easily broken can improve the usage safety.” The fluorescent bulb is composed of a lamp housing, a positioning base, a fluorescent tube, a conducting head, a circuit board, and electronic components connected to the circuit board, wherein the lamp housing is consisted of the two light permeable half plastic housings, and the two light permeable half housings have plural heat dissipating holes mounted thereon for providing heat dissipating function. However, since the fluorescent tube is encapsulated in the lamp housing and the positioning base does not additionally provide the heat dissipating function, the exhausting of the heat produced by the fluorescent tube through the heat dissipating holes has to be achieved by air convection. But, based on the physical principle that hot air rises up, it is obvious the heat dissipating holes which are located at the lower portion of the lamp housing can not efficiently exhaust the heat. Besides, the encapsulated structure also lowers down the heat dissipating efficiency. Therefore, this is still improvable. Another disclosure, R.O.C. Patent No. M265535, entitled “Bulb Type of Daylight Lamp Composite Structure”, has the abstract described that “The present application is related to the structure of a daylight fluorescent bulb which provides an easier and rapider assembling manner for the daylight fluorescent tube, the housing and the metal head, and also achieves the efficacies of firmness and durability, including an integrally formed assembling/fixing component having threads, a plate, engaging pieces, and engaging openings, wherein through the threads, the engaging pieces, and the engaging openings, the daylight fluorescent tube can be rapidly and securely assembled without adhesives, and through the threads and the plate, the housing and the metal head can be screwed and positioned rapidly and firmly, thereby improving the efficacy and providing a great practicability.” The bulb lamp includes a daylight fluorescent tube, a metal head, an outer shell, an assembling/fixing component, and a ballast and starter. In this disclosure, although the daylight fluorescent tube is not sealed for providing a better heat dissipating effect, the ballast and starter is accommodated in the assembling/fixing component, which only provides several let-in holes for passing through the air and providing slight heat dissipating effect. Thus, the daylight fluorescent tube still might become overheated. Consequently, although the above-described applications do achieve the main objects thereof, the heat dissipating efficiency is still improvable for preventing the overheated situation from reducing the life of the lamp.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a lamp structure with great heat dissipating capability, so as to increase the life time of the lamp.

The present invention is related to a heat dissipating structure for a lamp including an illuminating element, a lamp base, a metal housing, a ring-shaped coil and a metal base. The metal housing has a great heat conducting capability, and the illuminating element is mounted on the lamp base, which is engaged with the metal housing. The ring-shaped coil which includes a primary winding and a secondary winding wound on a ring iron core is mounted between the metal housing and the lamp base, wherein the ring iron core further includes an inner space for accommodating plural electronic components connected with the secondary winding, and the ring-shaped coil is electrically connected with the illuminating element and the metal base. And, the metal base is electrically connected to a power source, so that through a conduction of the metal base, the ring-shaped coil can acquire and transform electricity to provide to the illuminating element for operation.

Therefore, through the great heat conductivity of the metal housing, the heat can be averagely distributed over the surface thereof for emitting outwardly so as to reduce the lamp temperature during operation and extend the life time of lamp.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Please refer toFIG. 1,FIG. 2,FIG. 3A,FIG. 3B,FIG. 4andFIG. 5. A lamp of the present invention includes an illuminating element1, a lamp base2, a metal housing6, a ring-shaped coil3and a metal base5. The metal housing6has a great heat conducting capability and includes two opposite openings, wherein one smaller opening is provided for passing therethrough the metal base5. Between the metal base5and the metal housing6, a connecting element4is further provided for insulation and protection, wherein two ends of the connecting element4are respectively adhered to or screwed on the metal base5and the metal housing6, and a male engaging portion41is provided on the connecting element4for engaging with a female engaging portion63, which is mounted on the metal housing6at a corresponding position thereto, so as to assemble the connecting element4and the metal housing6together (as shown inFIG. 5). The ring-shaped coil3is mounted between the metal housing6and the lamp base2(as shown inFIG. 1andFIG. 3A). The ring-shaped coil3is composed of a primary winding31and a secondary winding32wound on a ring iron core33, wherein the ring iron core33has an inner space30for accommodating plural electronic components connected with the secondary winding32. In a preferred embodiment, the plural electronic components can be a rectifying component71and a filtering component, and preferably, the filtering component can be a capacitor72, so as to form an equivalent circuit as shown inFIG. 4for driving the illuminating element1. Further, the secondary winding32is electrically connected with the illuminating element1, and the primary winding31is electrically connected with the metal base5.

The other larger opening of the metal housing6has at least a protruded ring61and at least a male engaging portion62mounted on the inner edge thereof, and the circumference of the lamp base2has an indent trough21and a female engaging portion22respectively corresponding thereto. Therefore, through the engagements between the indent trough21and the protruded ring61and between the female engaging portion22and the male engaging portion62, the lamp base2can be assembled onto the larger opening of the metal housing6(as shown inFIG. 3B), so as to form an encapsulated structure. The illuminating element1is assembled on a bearing surface23of the lamp base2so as to form an integral lamp assembly (as shown inFIG. 2). The illuminating element1is electrically connected to the secondary winding32of the ring-shaped coil3, and the primary winding31is electrically connected to the metal base5. The metal base5has threads51mounted thereon. After the metal base5is contacted with the power source and conducted thereby, through the ring-shaped coil3, the rectifying component71, and the capacitor72, the electricity can be transformed and transmitted to the illuminating element1(as shown inFIG. 1, which can be plural LEDs) for illumination. Furthermore, the male engaging portions62,41can have a slat-like shape and the female engaging portions22,63can be slots perfectly matched therewith, so that the heat produced from the illuminating element1, the ring-shaped coil3, the rectifying component71and the capacitor72can be conducted to the metal housing6, which is preferably made of aluminum alloy or copper alloy. Therefore, through the great heat conductivity of the metal housing6, the heat from the illuminating element1and the ring-shaped coil3can be averagely distributed over the surface thereof for emitting outwardly so as to reduce the lamp temperature during operation.

Please refer toFIG. 6, as shown, the illuminating element1is not restricted to be LEDs, and it also can be a bulb. Besides, the ring-shaped coil3also can be connected with other electronic components, such as plural resistors, inducers, and ICs. By utilizing the ring-shaped coil3to replace the conventional electronic rectifier, in addition to providing more stable DC electricity, the problems of high frequency harmonic pollution, EMI, and oversized volume (which causes the difficulty in installing in a small lamp) also can be solved. Therefore, the ring-shaped coil3not only can be suitable for lamps of various sizes, but also possesses the advantages of reduced harmonic, noises and EMI.