Patent Application
20130170231
1. Field of the Invention
The instant disclosure relates to a spherical light bulb and a heat dissipating device arranged thereon; in particular, to a spherical light bulb which utilizes the light-emitting diode (LED) as the light source.
2. Description of Related Art
Nowadays, LEDs have been applied widely on spherical light bulbs, and majority of the spherical light bulbs include a screw-like connector, a heat dissipating device, and a transparent light cover. In order to dissipate heat efficiently, the heat dissipating device of conventional LED spherical light bulbs generally occupies a large portion of the spherical light bulb. In other words, through observing from the side view, the central portion of the spherical light bulb is mostly occupied by the heat dissipating device, leaving only a relatively smaller portion for the transparent light cover. This kind of design lead to the semispherical-shaped transparent light cover in most of the commonly-seen LED spherical light bulbs, meanwhile narrowing the illumination angle thereof.
Through the study of the aforementioned LED spherical light bulbs, two existing problems are discovered; firstly, the transparent light cover is too small and the illumination angle of light is too narrow, and the key point to overcome the first problem is to find a cooperating heat dissipating device, and this refers to the second problem. In other words, the heat dissipating efficiency of the heat dissipating device has to be improved to reduce the height ratio so as to increase the illumination angle.
To address the above issue, the inventor strives via industrial experience and academic research to present the instant disclosure, which can effectively improve the limitation described above.
The object of the instant disclosure is to provide a spherical light bulb. Through the cooperation of the improved heat dissipating device and the transparent light cover, the illumination angle of the light bulb can be increased. In addition, the instant disclosure provides a heat dissipating device for the spherical light bulb, where the heat dissipating structure is modified to enhance the heat dissipating efficiency of the spherical light bulb.
In order to achieve the aforementioned objects, according to an embodiment of the instant disclosure, a spherical light bulb is provided, which includes a connector, a driver module, a heat dissipating device, a light source unit, and a transparent light cover. The driver module includes a driver which is electrically connected to the connector. The heat dissipating device includes: a barrel-shaped member; a plurality of heat dissipating fins; a supporting member; and a connecting portion. The heat dissipating fins protrude outward from the outer surface of the barrel-shaped member, and the supporting member is arranged on one end of the barrel-shaped member. Moreover, the connecting portion is arranged around the supporting member and connected to the heat dissipating fins. In addition, the supporting member has a supporting surface, and a heat dissipating channel in communication with the inner space defined by the barrel-shaped member and the supporting surface, and the driver is arranged inside the barrel-shaped member. A slot is concaved outward from the inner surface of the barrel-shaped member in communication with a plurality of gaps formed between the heat-dissipating fins. Thereby, each gap is enabled to communicate with the heat-dissipating channel. The light source unit is arranged on the supporting surface of the supporting member. The transparent light cover is substantially spherical-shaped having an opening formed thereon. The transparent light cover is fixed to the connecting portion through a flanged portion around the opening, where the supporting member passes through the opening and is arranged inside the transparent light cover.
In order to achieve the aforementioned objects, according to an embodiment of the instant disclosure, a heat dissipating device which is connected to the transparent light cover of the spherical light bulb is provided. The heat dissipating device includes: a barrel-shaped member; a plurality of heat dissipating fins; a supporting member; and a connecting portion. The heat dissipating fins protrude outward from the outer surface of the barrel-shaped member, and the supporting member is arranged on one end of the barrel-shaped member. Moreover, the connecting portion is arranged around the supporting member and connected to the heat dissipating fins. In addition, the supporting member has a supporting surface and a heat dissipating channel in communication with the inner space defined by the barrel-shaped member and the supporting surface. The connecting portion is connected to a flanged portion of the transparent light cover.
The instant disclosure has the following advantages: the supporting member passes through the opening of the transparent light cover in providing a wider illumination angle; in comparison to conventional heat dissipating structures, the instant disclosure further provides a method of convective heat transfer; and heat produced by the light source unit can not only be transmitted to the heat dissipating fins from the supporting member, but also from the heat dissipating channel and the slot, thereby, the heat dissipating efficiency of the heat dissipating device is enhanced by utilizing the method of convection to vent the residual heat.
In order to further appreciate the characteristics and technical contents of the instant disclosure, references are hereunder made to the detailed descriptions and appended drawings in connection with the instant disclosure. However, the appended drawings are merely shown for exemplary purposes, rather than being used to restrict the scope of the instant disclosure.
The aforementioned illustrations and following detailed descriptions are exemplary for the purpose of further explaining the scope of the instant disclosure. Other objectives and advantages related to the instant disclosure will be illustrated in the subsequent descriptions and appended drawings.
Please refer to
Referring again to
The driver module 20 is arranged between the connector 10 and the heat dissipating device 30. The driver 24 is connected electrically to the connector 10 to convert the power from the connector 10 into electrical power suitable for the light source unit 40. One end of the outer housing 22, shown with the orientation in the figures, is defined as an upper end portion 221 fixed to the connector 10, while the other end of the outer housing 22, shown with the orientation in the figures, is defined as a lower end portion 222 secured inside the barrel-shaped member 32. A blocking member 223 is formed centrally on the surface of the outer housing 22, abutting the barrel-shaped member 32 and the heat dissipating fins 34 of the heat dissipating device 30. Furthermore, the outer housing 22 of the instant embodiment has a base surface 224 defined on the base section of the lower end portion 222, and the base surface 224 is fixed to the supporting member 36 of the heat dissipating device 30 through screws S1.
The light source unit 40 is arranged on the supporting surface P of the supporting member 36. The light source unit 40 of the instant embodiment includes a substrate 42 arranged against the supporting surface P and a converging lens 44. An LED is arranged on the substrate 42 as the light source, and the substrate 42 can be either a metal or a ceramic substrate. The area of the substrate 42 of the instant embodiment is substantially equivalent to the area of the supporting surface P, and the substrate 42 is fixed to the supporting member 36 by using screws S2.
The transparent light cover 50 of the instant disclosure is specially designed. Two thirds of the transparent light cover 50 is a spherical housing 51, and a transitional housing 53 is connected thereto. A transition loop line 510 is defined between the spherical housing 51 and the transitional housing 53. An opening 52 is formed on the edge of the transitional housing 53 of the transparent light cover 50. A flanged portion 54 is arranged around the opening 52 of the transparent light cover 50 for securing to the connecting portion 38 of the heat dissipating device 30. The aforementioned design enables the instant disclosure to acquire a greater illumination angle. Through the design of the aforementioned supporting member 36 and the connecting portion 38, the instant embodiment can provide an illumination angle of 285 degrees. Further illustrations of the structural arrangements shall be provided in
Another feature of the instant disclosure is that the structure of the heat dissipating device is improved to enhance the heat dissipating efficiency of the spherical light bulb. Please refer to
Notably, the heat dissipating channel 360 of the instant embodiment is defined by a central hole 361 and a plurality of extended troughs 363 in communication therewith. The central hole 361 is projected through the central portion of the supporting member 36 and concaves from the supporting surface P. The supporting member 36 has an inner surface defined inside the barrel-shaped member 32 opposite of the supporting surface P. In other words, the extended troughs 363 are formed concavely on the inner surface. The extended troughs 363 of the instant embodiment are radially arranged toward the slot 320. In other words, the extended troughs 363 extend toward the gaps 340 between the heat dissipating fins 34. Thus, such design enhances heat convection.
Furthermore, the supporting member 36 of the instant embodiment further has a passageway 362 concavely formed on the supporting surface P. The passageway 362 communicates with the heat dissipating channel 360. At least one passageway 362 is provided. By utilizing the passageway 362, air can flow between the base portion of the light source unit 40 and the supporting member 36 to form a convection path from inside the transparent light cover 50 to the outside of the heat dissipating device 30.
Referring to
Referring to
Based on the above, the advantages of the instant disclosure are that the supporting member 36 is passed through the opening 52 of the transparent light cover 50 and arranged therein. In addition, two thirds of the transparent light cover 50 is approximately the spherical housing 51, thereby providing a larger illumination angle. Furthermore, in comparison to conventional heat dissipating structures, the instant disclosure further provides a method of convective heat transfer. Heat produced by the light source unit 40 can not only be transmitted to the heat dissipating fins 34 through the supporting member 36, but also be dissipated through the heat dissipating channel 360 and the slot 320 by convection.
The descriptions illustrated supra set forth simply the preferred embodiments of the instant disclosure; however, the characteristics of the instant disclosure are by no means restricted thereto. All changes, alternations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the instant disclosure delineated by the following claims.
