LED tube lamp

  • US 8,998,448 B2
  • Filed: 04/21/2011
  • Issued: 04/07/2015
  • Est. Priority Date: 10/28/2010
  • Status: Active Grant
First Claim
Patent Images

1. An LED tube lamp, comprising:

  • a heat sink;

    an LED substrate mounted on the heat sink and comprising a plurality of LEDs;

    a cover fixed to the heat sink and shielding the plurality of LEDs;

    wherein the cover comprises a first cover and a second cover, the first cover is closer to the LED substrate than the second cover, at least one optical lens is arranged on the first cover, each of the at least one optical lens comprises a concave lens, reflective lenses arranged on both sides of the concave lens and scatter layers arranged on lateral surface of the reflective lenses, the concave lens is a plano concave lens comprising a planar surface and a concave surface, the light beams enter the concave lens from the planar face and exit from the concave face, the concave lens are configured for refracting light beams from the LEDs in a forward direction or in an approximate forward direction, the reflective lenses are configured for reflecting light beams from the LEDs in a lateral direction.

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