Patent Publication Number: US-8529091-B2

Title: T-bar lamp

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial no. 100212757, filed on Jul. 12, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a lamp. Particularly, the invention relates to a T-bar lamp. 
     2. Description of Related Art 
     A light-emitting diode (LED) is a semiconductor device, and a material of the LED chip thereof is mainly a compound of III-V chemical elements, for example, GaP or GaAs, and a light-emitting principle thereof is to transform electrical energy into light energy. A life span of the LED is more than 100,000 hours, and the LED has advantages of fast response speed, small size, power saving, low pollution, high reliability and suitable for mass production, etc. 
     Along with increasing demand for energy conservation and environmental protection, it is a world trend to use the LEDs to construct lighting lamps used in people&#39;s daily light. According to a current technique, LED bare chips or packages thereof are generally installed on a carrier (for example, a printed circuit board) to serve as lighting elements. 
     When the LED is applied to a T-bar lamp, a consumed power thereof is far less than that of a conventional lamp tube module, which becomes a best choice of modern commercial lighting. Therefore, the T-bar lamp using the LED light source is particularly suitable for offices and environments with a high lamp usage amount. However, regarding the T-bar lamp using the LED light source, it is uneasy to replace the LED light source when it is damaged. 
     SUMMARY OF THE INVENTION 
     The invention is directed to a T-bar lamp, in which a light-emitting diode (LED) light source is capable of being individually detached and can be conveniently replaced. 
     The invention provides a T-bar lamp including a T-Bar lamp housing and at least a light engine module. The T-bar lamp housing has an opening. The light engine module is fixed in the T-Bar lamp housing, and the light engine module at least includes a chip on board (COB) type LED light source. 
     According to an embodiment of the invention, in the T-bar lamp, the COB type LED light source includes a substrate and at least one LED chip. The LED chip is disposed on the substrate. 
     According to an embodiment of the invention, in the T-bar lamp, a material of the substrate is, for example, a metal material or a ceramic material. 
     According to an embodiment of the invention, in the T-bar lamp, the light engine module further includes a cooling module, and the COB type LED light source is disposed on the cooling module. 
     According to an embodiment of the invention, in the T-bar lamp, a material of the cooling module is, for example, a metal material. 
     According to an embodiment of the invention, in the T-bar lamp, the light engine module further includes at least one LED chip disposed on the cooling module. 
     According to an embodiment of the invention, the T-bar lamp further includes a diffusion plate, which is disposed on the T-bar lamp housing and covers the opening. 
     According to an embodiment of the invention, in the T-bar lamp, a material of the diffusion plate is, for example, polystyrene (PS), polycarbonate (PC) or polymethyl methacrylate (PMMA). 
     According to an embodiment of the invention, the T-bar lamp further includes a power module, which is disposed on the T-bar lamp housing and supplies power to the light engine module. 
     According to an embodiment of the invention, in the T-bar lamp, the power module is, for example, an alternating current (AC) to direct current (DC) transformer. 
     According to the above descriptions, in the T-bar lamp of the invention, since the T-bar lamp uses the COB type LED light source, the LED light source can be individually detached and can be conveniently replaced. 
     In order to make the aforementioned and other features and advantages of the invention comprehensible, several exemplary embodiments accompanied with figures are described in detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is an explosion diagram of a T-bar lamp according to an embodiment of the invention. 
         FIG. 2  is a schematic diagram of a light engine module in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS 
       FIG. 1  is an explosion diagram of a T-bar lamp according to an embodiment of the invention.  FIG. 2  is a schematic diagram of a light engine module in  FIG. 1 . 
     Referring to  FIG. 1  and  FIG. 2 , the T-bar lamp  100  includes a T-Bar lamp housing  102  and light engine modules  104 . The T-bar lamp housing  102  has an opening  106 . A size of the T-bar lamp housing  102  is, for example, 59.5 cm×59.5 cm to 60.5 cm×60.5 cm. 
     The light engine modules  104  are fixed in the T-Bar lamp housing  102 , and each of the light engine modules  104  at least includes a chip on board (COB) type LED light source  108 . The COB type LED light source  108  can be individually replaced, which has an advantage of easy replacement. The COB type LED light source  108  includes a substrate  110  and LED chips  112 . The LED chips  112  are disposed on the substrate  110 . A material of the substrate  110  is, for example, a metal material or a ceramic material. 
     Moreover, the light engine module  104  may selectively include a cooling module  114 . The COB type LED light source  108  is disposed on the cooling module  114 , which avails cooling the COB type LED light source  108 . A material of the cooling module  114  is, for example, a metal material. When the light engine module  104  is formed by disposing the COB type LED light source  108  on the cooling module  114 , a user can easily replace the light engine module  104 . In another embodiment, when the light engine module  104  does not have the cooling module  114 , the COB type LED light source  108  used as the light engine module  104  is directly fixed in the T-bar lamp housing  102 . 
     Moreover, the light engine module  104  may selectively include LED chips  116 . The LED chips  116  are disposed on the cooling module  114 , which avails increasing an overall illumination brightness of the light engine module  104 . 
     In the present embodiment, the number of the light engine modules  104 , the number of the LED chips  112  on one COB type LED light source  108  and the number of the LED chips  116  on one light engine module  104  are, for example, respectively 4, 6 and 16 (due to a viewing angle&#39;s sake, a part of the LED chips  116  in  FIG. 1  and  FIG. 2  are shielded by the cooling module  114 ), though the invention is not limited thereto, and as long as the number of the light engine module  104 , the number of the LED chip  112  on one COB type LED light source  108  and the number of the LED chip  116  on one light engine module  104  are respectively one or more, it is considered to be within a protection scope of the invention. Those skilled in the art can adjust the number of the light engine modules  104 , the number of the LED chip  112  and the number of the LED chip  116  according to an actual design requirement. 
     On the other hand, the T-bar lamp  100  may selectively include at least one of a diffusion plate  118  and a power module  120 . The diffusion plate  118  is disposed on the T-bar lamp housing  102  and covers the opening  106 , which avails avoiding generation of glare. A material of the diffusion plate  118  is, for example, polystyrene (PS), polycarbonate (PC) or polymethyl methacrylate (PMMA). The power module  120  is disposed on the T-bar lamp housing  102 , and supplies power to the light engine module  104 . The power module  120  is, for example, an alternating current (AC) to direct current (DC) transformer. 
     According to the above embodiment, it is known that since the T-bar lamp  100  uses the COB type LED light source  108 , the LED light source can be individually detached and can be conveniently replaced. Moreover, when the light engine module  104  is formed by disposing the COB type LED light source  108  on the cooling module  114 , the user can easily replace the light engine module  104 . 
     In summary, the aforementioned embodiment has at least following advantages:
         1. The T-bar lamp of the invention has an individually detachable LED light source.   2. By using the T-bar lamp of the invention, the LED light source can be conveniently replaced.       

     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.