Abstract:
A lighting device for street light, lounge light, signboard light or streamline worktable light application to meet energy-saving and carbon-reduction requirements is disclosed to include a light source, a lamp case, a power converter, a shaped reflector for reflecting light rays from the light source toward a predetermined space area to form a rectangular or specially shaped illumination zone, and a light-transmissive material. The shaped reflector includes an inner reflecting surface, two lateral walls respectively formed of a straight line segment structure of an outwardly arched curvature, and opposing front and rear walls respectively providing an outwardly arched curvature. Each outwardly arched curvature consists of multiple inclined faces inclining in such a manner that an upper inclined face inclines toward the center of the shaped reflector at a relative greater angle than one adjacent lower inclined face.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a lighting technology and more particularly, to a lighting device with shaped reflector. The shaped reflector of the lighting device has a specially designed reflecting surface for reflecting light rays emitted by the light source of the lighting device toward a predetermined space area, forming a rectangular or specially shaped illumination zone. 
         [0003]    2. Description of the Related Art 
         [0004]    Regular lighting devices may be equipped with a reflector to reflect emitted light toward a predetermined illumination area.  FIG. 1A  illustrates one prior art design of lighting device, in which the reflector comprises an arched reflecting surface  101  on the middle, two planar reflecting surfaces  102 ; 103  at two opposite lateral sides, two mounting through holes  104 ; 105  respectively cut through the two planar reflecting surfaces  102 ; 103 , and a lamp tube  106  mounted in the mounting through holes  104 ; 105 . This design of reflector can reflect emitted light toward a substantially square illumination area. 
         [0005]      FIG. 1B  illustrates another prior art design of lighting device, in which the reflector comprises a semielliptical reflecting surface  107 , a through hole  108  cut through the semielliptical reflecting surface  107  at one lateral side, and a lamp tube  109  mounted in the through hole  108  and suspended on the inside of the reflector. This design of reflector can reflect emitted light toward a substantially elliptical illumination area. 
         [0006]      FIG. 1C  illustrates still another prior art design of lighting device, in which the reflector comprises a smoothly arched reflecting surface  107  around the periphery, a planar top reflecting surface  111 , a through hole  1128  cut through the planar top reflecting surface  111 , and a lamp tube  113  mounted in the through hole  112  and vertically suspended inside of the reflector. This design of reflector can reflect emitted light toward a circular illumination area. 
         [0007]    The aforesaid prior art designs can simply illuminate a square, elliptical or circular illumination area, not suitable for street light, lounge light, signboard light or streamline worktable light application. If the aforesaid prior art designs are used for street light, lounge light, signboard light or streamline worktable light application to provide the desired brightness, the lighting power density must be relatively increased, causing waste of power. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a lighting device with shaped reflector, which eliminates the drawbacks of the conventional designs. 
         [0009]    To achieve this and other objects of the invention, a lighting device comprises a light source adapted to emit light, and a shaped reflector mounted in the light source for reflecting light emitted by the light source toward a predetermined space area. The shaped reflector comprises: an inner reflecting surface comprising a first stepped, outwardly arched curvature, a second stepped, outwardly arched curvature and a planar wall connected between the first stepped, outwardly arched curvature and the second stepped, outwardly arched curvature, the first stepped, outwardly arched curvature and the second stepped, outwardly arched curvature each comprising a plurality of inclined faces, the inclined faces of the first stepped, outwardly arched curvature inclining in such a manner that one upper inclined face inclines toward the center of the shaped reflector at a relative greater angle than one adjacent lower inclined face, the inclined faces of the second stepped, outwardly arched curvature inclining in such a manner that one upper inclined face inclines toward the center of the shaped reflector at a relative greater angle than one adjacent lower inclined face; two opposing lateral walls, each lateral wall comprising a straight line segment structure formed of a plurality of stepped, outwardly arched curvatures and a connection wall connected between each two adjacent stepped outwardly arched curvatures; a planar top wall; and opposing front wall and rear wall, the front wall and the rear wall being stepped, outwardly arched walls respectively connected between the straight line segment structures of the lateral walls, the front wall and the rear wall being stepped, outwardly arched walls each comprising a straight line segment structure formed of a plurality of stepped, outwardly arched curvatures and a connection wall connected between each two adjacent stepped outwardly arched curvatures. 
         [0010]    In an alternate form of the present invention, the lighting device comprises a light source adapted to emit light, and a shaped reflector mounted in the light source for reflecting light emitted by the light source toward a predetermined space area. The shaped reflector comprises an inner reflecting surface comprising an outwardly arched curvature consisting of a plurality of inclined faces, the inclined faces of the inner reflecting surface inclining in such a manner that one upper inclined face inclines toward the center of the shaped reflector at a relative greater angle than one adjacent lower inclined face; two opposing lateral walls, each lateral wall comprising a straight line segment structure formed of the outwardly arched curvature; a top wall; and opposing front wall and rear wall, the front wall and the rear wall being outwardly arched walls respectively connected between the straight line segment structures of the lateral walls and providing an outwardly arched curvature. 
         [0011]    In another alternate form of the present invention, the lighting device comprises a light source adapted to emit light, and a shaped reflector mounted in the light source for reflecting light emitted by the light source toward a predetermined space area. The shaped reflector comprises an inner reflecting surface comprising an outwardly arched curvature consisting of a plurality of inclined faces, the inclined faces of the inner reflecting surface inclining in such a manner that one upper inclined face inclines toward the center of the shaped reflector at a relative greater angle than one adjacent lower inclined face; two opposing lateral walls, each lateral wall comprising a respective straight line segment structure formed of a respective laminated stretched curvature; a top wall; and opposing front wall and rear wall, the front wall and the rear wall being outwardly arched walls respectively connected between the straight line segment structures of the lateral walls and providing an outwardly arched curvature, the front wall and the rear wall being asymmetric. 
         [0012]    Further, the lighting device with shaped reflector in accordance with the present invention can be designed for use as a street light, lounge light, signboard light or streamline worktable light, to effectively convert light rays emitted by the light source into luminous rays, lowering power consumption and meeting energy-saving and carbon-reduction requirements. 
         [0013]    Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]      FIG. 1A  is a schematic drawing of a lighting device according to the prior art. 
           [0015]      FIG. 1B  is a schematic drawing of another design of lighting device according to the prior art. 
           [0016]      FIG. 1C  is a schematic drawing of still another design of lighting device according to the prior art. 
           [0017]      FIG. 2A  is a schematic side view of a shaped reflector for lighting device according to a first example of the present invention. 
           [0018]      FIG. 2B  is a front view of  FIG. 2A . 
           [0019]      FIG. 3A  is a schematic side view of a shaped reflector for lighting device according to a second example of the present invention. 
           [0020]      FIG. 3B  is a front view of  FIG. 3A . 
           [0021]      FIG. 4A  is a schematic side view of a shaped reflector for lighting device according to a third example of the present invention. 
           [0022]      FIG. 4B  is a front view of  FIG. 4A . 
           [0023]      FIG. 5A  is a schematic side view of a shaped reflector for lighting device according to a fourth example of the present invention. 
           [0024]      FIG. 5B  is a front view of  FIG. 5A . 
           [0025]      FIG. 6A  is a schematic side view of a shaped reflector for lighting device according to a fifth example of the present invention. 
           [0026]      FIG. 6B  is a front view of  FIG. 6A . 
           [0027]      FIG. 7A  is a schematic side view of a shaped reflector for lighting device according to a sixth example of the present invention. 
           [0028]      FIG. 7B  is a front view of  FIG. 7A . 
           [0029]      FIG. 8A  is a schematic side view of a shaped reflector for lighting device according to a seventh example of the present invention. 
           [0030]      FIG. 8B  is a front view of  FIG. 8A . 
           [0031]      FIG. 9A  is a schematic front view of a shaped reflector for lighting device according to an eighth example of the present invention. 
           [0032]      FIG. 9B  is a schematic front view of a shaped reflector for lighting device according to a tenth example of the present invention. 
           [0033]      FIG. 10A  is a schematic front view, illustrating one design of through holes on the top wall of the shaped reflector for lighting device in accordance with the present invention. 
           [0034]      FIG. 10B  is a schematic front view, illustrating another design of through holes on the top wall of the shaped reflector for lighting device in accordance with the present invention. 
           [0035]      FIG. 11  is a schematic sectional view of a suspension lighting device embodying the present invention. 
           [0036]      FIG. 12  is a schematic sectional view of a street light embodying the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0037]    Referring to  FIG. 11 , a lighting device having a shaped reflector in accordance with the present invention is shown. According to this embodiment, the lighting device is a suspension lighting device  10 , comprising an electrical box  1011 , a power converter  1012  mounted in the electrical box  1011  and secured to the outwardly extending planar bottom wall of the electrical box  1011  by an iron strap  1017 , a dust cover  1013  arranged at the bottom side of the electrical box  1011 , a light-transmissive plate member  1018  located on the light-outgoing portion in the bottom side of the dust cover  1013 , a bracket  1014  mounted inside the dust cover  1013 , a shaped reflector  1015  mounted in the bracket  1014 , a lamp tube holder  1019  arranged at the top side of the shaped reflector  1015 , and a light source  1016  installed in the lamp tube holder  1019  and suspending in the shaped reflector  1015 . 
         [0038]    The main feature of the lighting device is the design of the shaped reflector. The shaped reflector is outlined hereinafter. 
         [0039]      FIGS. 2A and 2B  illustrate a first example of the shaped reflector in accordance with the present invention. As illustrated, the inner surface of the shaped reflector  20  is a reflecting surface. The shaped reflector  20  comprises two lateral walls  202 ; 203 . One lateral wall  203  consists of a plurality of inclined faces  203   a ˜ 203   n , providing an outwardly arched curvature. The inclined faces  203   a ˜ 203   n  respectively incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  20  at a relatively greater angle than the adjacent lower inclined face. The other lateral wall  202  has the same structural feature. The outwardly arched curvature of each of the two lateral walls  202 ; 203  forms a structure of straight line segment, as shown in  FIG. 2B . The straight line segments of the two lateral walls  202 ; 203  are symmetric. 
         [0040]    Referring to  FIG. 2B  again, the opposing front and rear walls of the shaped reflector  20  are outwardly arched walls  207 ; 208 . These two outwardly arched walls  207 ; 208  are curved from the two straight line segments of the two lateral walls  202 ; 203  in a symmetric but non-concentric manner. 
         [0041]    The shaped reflector  20  further comprises a bottom planar wall  204  and a top planar wall  205 . 
         [0042]      FIGS. 3A and 3B  illustrate a second example of the shaped reflector in accordance with the present invention. As illustrated, one lateral wall  303  of the shaped reflector  30  comprises a first stepped straight line segment structure  302 , a second stepped straight line segment structure  305 , and a slope  304 . The first stepped straight line segment structure  302  consists of a plurality of inclined faces  302   a ˜ 302   n  that are configured in such a manner that one upper inclined face inclines toward the center of the shaped reflector  30  at a relatively greater angle than the adjacent lower inclined face. The first stepped straight line segment structure  302  has the top edge thereof connected to an outer edge of slope  304  that slopes toward the bottom side of the shaped reflector  30 . The slope  304  has its inner edge connected to the bottom edge of the second stepped straight line segment structure  305 . 
         [0043]    The second stepped straight line segment structure  305  consists of a plurality of inclined faces  305   a ˜ 305   n  that are configured in such a manner that one upper inclined face incline toward the center of the shaped reflector  30  at a relatively greater angle than the adjacent lower inclined face. The other lateral wall of the shaped reflector  30  also comprises a first stepped straight line segment structure  312 , a second stepped straight line segment structure  313 , and a slope  314 . The first stepped straight line segment structure  302  and the first stepped straight line segment structure  312  are symmetric; the second stepped straight line segment structure  305  and the second stepped straight line segment structure  313  are symmetric. 
         [0044]    Referring to  FIG. 3B  again, the opposing front and rear walls of the shaped reflector  30  are stepped, outwardly arched walls respectively started from a straight line segment structure in a same outwardly arched curvature. The front wall comprises a sector slope  310  connected between two part parts  306 ; 307  thereof. These two stepped, outwardly arched walls are arranged in a symmetric but non-concentric manner. 
         [0045]    The shaped reflector  30  further comprises a bottom planar wall  301  and a top planar wall  303 . 
         [0046]      FIGS. 4A and 4B  illustrate a third example of the shaped reflector in accordance with the present invention. According to this third example, one lateral wall of the shaped reflector  40  comprises a planar wall  404  is connected between a first stepped straight line segment structure  402  and a second stepped straight line segment structure  405  thereof; the other lateral wall of the shaped reflector  40  comprises a planar wall  413  is connected between a first stepped straight line segment structure  411  and a second stepped straight line segment structure  4112  thereof; the front wall of the shaped reflector  40  comprises a sector plane  410  connected between a first stepped, outwardly arched wall  406  and a second stepped, outwardly arched wall  407  thereof; the rear wall of the shaped reflector  40  comprises a sector plane  411  connected between a first stepped, outwardly arched wall  409  and a second stepped, outwardly arched wall  408  thereof. 
         [0047]      FIGS. 5A and 5B  illustrate a fourth example of the shaped reflector in accordance with the present invention. According to this fourth example, each of the two opposing lateral walls of the shaped reflector  50  are outwardly arched walls each consisting of three stepped straight line segment structures. The first stepped straight line segment structure  502  of one lateral wall of the shaped reflector  50  comprises a plurality of inclined faces  502   a ˜ 502   n  that respectively incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  50  at a relatively greater angle than the adjacent lower inclined face. 
         [0048]    The first stepped straight line segment structure  502  has its top edge connected to an outer edge of a planar wall  504 , which has its inner edge connected to the bottom edge of the second stepped straight line segment structure  505 . 
         [0049]    The second stepped straight line segment structure  505  comprises a plurality of inclined faces  505   a ˜ 505   n  that respectively incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  50  at a relatively greater angle than the adjacent lower inclined face. 
         [0050]    The second stepped straight line segment structure  505  has its top edge connected to an outer edge of a slope  506 , which slopes downwardly and inwardly toward the center of the shaped reflector, having its inner edge connected to the bottom edge of the third stepped straight line segment structure  506 . 
         [0051]    The third stepped straight line segment structure  508  comprises a plurality of inclined faces  508   a ˜ 508   n  that respectively incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  50  at a relatively greater angle than the adjacent lower inclined face. The other lateral wall of the shaped reflector comprises first, second and third stepped straight line segment structures  518 ; 519 ; 520 , a planar wall  521  connected between the first stepped straight line segment structure  518  and the second stepped straight line segment structure  519 , and a slope  522  connected between the second stepped straight line segment structure  519  and the third stepped straight line segment structure  520 . In this example, the two lateral walls of the shaped reflector  50  are symmetric. 
         [0052]    Referring to  FIG. 5B  again, the front and rear walls of the shaped reflector  50  are outwardly arched walls. The front wall of the shaped reflector  50  comprises a first stepped, outwardly arched wall  507 , a second stepped, outwardly arched wall  509 , a first sector plane  511  connected between the first stepped, outwardly arched wall  507  and the second stepped, outwardly arched wall  509 , a third stepped, outwardly arched wall  510 , and a second sector plane  512  connected between the second stepped, outwardly arched wall  509  and the third stepped, outwardly arched wall  510 . Further, the front wall and rear wall of the shaped reflector  50  are symmetric. 
         [0053]    The shaped reflector  50  further comprises a bottom planar wall  501  and a top planar wall  503 . 
         [0054]      FIGS. 6A and 6B  illustrate a fifth example of the shaped reflector in accordance with the present invention. According to this fifth example, the two opposing lateral walls  601 ; 602  of the shaped reflector  60 , similar to the lateral walls of the shaped reflector shown in  FIGS. 4A and 4B , are outwardly arched walls each consisting of two stepped straight line segment structures. The front wall of the shaped reflector  60  comprises two outwardly arched walls  603 ; 604  and one outwardly arched straight line segment structure  605 . The two outwardly arched walls  603 ; 604  respectively extend from the straight line segment structures  601 ; 602  of the lateral walls of the shaped reflector  60  in a same curvature and are joined by the outwardly arched straight line segment structure  605 . The outwardly arched straight line segment structure  605  has two opposing side edges thereof respectively connected to the two outwardly arched walls  603 ; 604 . The inner reflecting surface of the outwardly arched straight line segment structure  605  consists of a plurality of inclined faces  605   a ˜ 605   n  that respectively incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  60  at a relatively greater angle than the adjacent lower inclined face. The rear wall of the shaped reflector  60  is an outwardly arched straight line segment structure  606 , having two opposing lateral edges thereof respectively connected to the straight line segment structures  601 ; 602  of the lateral walls of the shaped reflector  60 . The outwardly arched straight line segment structure  606  consists of a plurality of inclined faces  606   a ˜ 606   n  that respectively incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  60  at a relatively greater angle than the adjacent lower inclined face. 
         [0055]      FIGS. 7A and 7B  illustrate a sixth example of the shaped reflector in accordance with the present invention. According to this sixth example, the inner surface of the shaped reflector  70  is a reflecting surface, providing two outwardly arched curvatures  702 ; 703 . One outwardly arched curvature  702  consists of a plurality of inclined faces  702   a ; 702   b ; 702   c ; 702   n  that incline at a different angle. The other outwardly arched curvature  703  consists of a plurality of inclined faces  703   a ; 703   b ; 703   c ; 703   n  that incline at a different angle. All the inclined faces of the outwardly arched curvatures  702 ; 703  incline in such a manner that one upper inclined face inclines toward the center of the shaped reflector  70  at a relatively greater angle than the adjacent lower inclined face. The two opposing lateral walls  706 ; 707  of the shaped reflector  70  each have a laminated stretched straight line segment structure, respectively formed of the outwardly arched curvatures  702 ; 703 . These two opposing lateral walls  706 ; 707  can be symmetric, or asymmetric. The opposing front and rear walls  708 ; 709  of the shaped reflector  70  are outwardly arched walls, respectively providing an outwardly arched curvature. Further, the front and rear walls  708 ; 709  are asymmetric. 
         [0056]    The shaped reflector  70  further comprises a bottom planar wall  705  and a top planar wall  704 . 
         [0057]    This sixth example is modification based on the design of  FIG. 2 . Alternatively any of the outwardly arched curvature designs shown in  FIGS. 3 through 6  can be employed to this sixth example. 
         [0058]      FIGS. 8A and 8B  illustrate a seventh example of the shaped reflector in accordance with the present invention. The inner surface of the shaped reflector  80  in accordance with this seventh example is substantially similar to that shown in  FIGS. 2A and 2B  with the exception that the top wall of the shaped reflector  80  curves inwards, consisting of a plurality of inclined faces  801   a ; 801   b ; 801   c ; 801   n  that incline in such a manner that one outer inclined face inclines toward the center of the shaped reflector  70  at a relatively greater angle than the adjacent inner inclined face. It is to be understood that the top wall of each of the examples shown in  FIGS. 3 through 7  can be an inwardly curved wall. 
         [0059]      FIG. 9A  illustrates a shaped reflector in accordance with an eighth example of the present invention. According to this example, the outwardly arched straight line segment structures of the two opposing lateral walls  1208 ; 1209  of the shaped reflector  90  are similar to that shown in  FIGS. 3A and 3B . The front wall of the shaped reflector  90  is an outwardly arched wall  1201  connected between the outwardly arched straight line segment structures of the two opposing lateral walls. The rear wall of the shaped reflector  90  comprises two outwardly arched walls  1202 ; 1203  connected between the outwardly arched straight line segment structures of the two opposing lateral walls in a symmetric but non-concentric manner. 
         [0060]      FIG. 9B  illustrates a shaped reflector in accordance with a ninth example of the present invention. According to this example, the outwardly arched straight line segment structures of the two opposing lateral walls  1218 ; 1211  of the shaped reflector  90  are similar to that shown in  FIGS. 3A and 3B . The front wall of the shaped reflector  91  comprises two outwardly arched walls  1204 ; 1205  connected between the outwardly arched straight line segment structures of the two opposing lateral walls in a symmetric but non-concentric manner. The rear wall of the shaped reflector  91  comprises two outwardly arched walls  1206 ; 1207  connected between the outwardly arched straight line segment structures of the two opposing lateral walls in a symmetric but non-concentric manner. 
         [0061]      FIGS. 10A and 10B  illustrate further two alternate forms of the shaped reflector. The example shown in  FIG. 10A  is based on the shaped reflector  20  shown in  FIG. 2 , having a through hole  904  cut through the front wall for the passing of the light source (lamp tube), and two through holes  901 ; 902  cut through the top wall for the mounting of the lamp bracket. The example shown in  FIG. 10B  is based on the shaped reflector  20  shown in  FIG. 2 , having a big through hole  903  cut through the front wall for the passing of the light source (lamp tube), and two small through holes  901 ; 902  cut through the top wall at two opposite sides relative to the big through hole  903  for the mounting of the lamp bracket. The shaped reflector constructed subject to any of the examples shown in  FIGS. 3 through 9  can provide similar through holes for mounting. 
         [0062]      FIG. 12  illustrates a street light  11  embodying the present invention. As illustrated, the street light  11  comprises a lamp case  1101 , a power converter  1102  mounted in the lamp case  1101 , a light-transmissive plate member  1104  located on the bottom side of the lamp case  1101 , and a shaped reflector  1103  mounted on the light-transmissive plate member  1104  inside the lamp case  1101  and holding a light source therein. 
         [0063]    The lighting device with shaped reflector in accordance with the present invention can be designed for use as a street light, lounge light, signboard light or streamline worktable light, to effectively convert light rays emitted by the light source into luminous rays, lowering power consumption and meeting energy-saving and carbon-reduction requirements. 
         [0064]    In the aforesaid various alternate forms of the present invention, the inner reflecting surface of the shaped reflector provides one or a limited number of outwardly arched curves each consisting of a plurality of faces that incline at different angles of inclination. In actual practice, each line segment of each outwardly arched curve can be composed of a plurality of sub-segments. 
         [0065]    Further, the light source of the lighting device constructed according to the embodiment shown in  FIG. 11  or  FIG. 12  can be a LED light source formed of one or a number of LED chips. 
         [0066]    Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.