Patent ID: 8443535

Claim:
An emergency exit indicator, comprising: a housing comprising two first connecting arms at top and bottom sides thereof and two second connecting arms at left and right sides thereof, the first and second connecting arms being connected with each other by four connecting units, the four connecting units being located respectively at four corners of the housing, each connecting unit comprising a seat and two engaging tabs extending from the seat, one of the two engaging tabs being engaged with a corresponding first connecting arm, the other one of the two engaging tabs being engaged with a neighboring second connecting arm; and a light source received in the housing; wherein the seats of the four connecting units are exposed out of the two first connecting arms and the two second connecting arms, and the seats, the two first connecting arms and the two second connecting arms cooperatively form a periphery of the housing; wherein the housing is flat and rectangular, with a length much greater than a thickness thereof; wherein the light source comprises a substrate, a plurality of LEDs mounted on the substrate, and a light guide device coupled to each of the LEDs, the light through the light guide device along a thickness direction of the housing being converged in a narrower manner than the light through the light guide device along a lengthwise direction of the housing; and wherein the light guide device is in the form of a hollow light guide cup with a top opening and a bottom opening at top and bottom sides thereof, respectively, the light guide cup being tapered along a top-to-bottom direction, the top opening having a size greater than the bottom opening, one of the LEDs being located at the center of the bottom opening.